diff --git a/docutranslate/app.py b/docutranslate/app.py
index e5c264e..de23b6c 100644
--- a/docutranslate/app.py
+++ b/docutranslate/app.py
@@ -205,7 +205,7 @@ class BaseWorkflowParams(BaseModel):
     concurrent: int = Field(default=default_params["concurrent"], description="并发请求数。")
     temperature: float = Field(default=default_params["temperature"], description="LLM温度参数。")
     thinking: ThinkingMode = Field(default=default_params["thinking"], description="是否启用深度思考",
-                                   examples=["default", "enable", "disable"]),
+                                   examples=["default", "enable", "disable"])
     custom_prompt: Optional[str] = Field(None, description="用户自定义的翻译Prompt。", alias="custom_prompt")
 
 
@@ -220,6 +220,7 @@ class MarkdownWorkflowParams(BaseWorkflowParams):
     mineru_token: Optional[str] = Field(None, description="当 `convert_engine` 为 'mineru' 时必填的API令牌。")
     formula_ocr: bool = Field(True, description="是否对公式进行OCR识别。对 `mineru` 和 `docling` 均有效。")
     code_ocr: bool = Field(True, description="是否对代码块进行OCR识别。仅 `docling` 引擎有效。")
+    model_version: Literal["pipline", "vlm"] = Field("vlm", description="Mineru模型的版本，'vlm'是更新的版本。仅 `mineru` 引擎有效。")
 
     @field_validator('mineru_token')
     def check_mineru_token(cls, v, values):
@@ -479,7 +480,8 @@ async def _perform_translation(
             converter_config = None
             if payload.convert_engine == 'mineru':
                 converter_config = ConverterMineruConfig(logger=task_logger, mineru_token=payload.mineru_token,
-                                                         formula_ocr=payload.formula_ocr)
+                                                         formula_ocr=payload.formula_ocr,
+                                                         model_version=payload.model_version)
             elif payload.convert_engine == 'docling' and DOCLING_EXIST:
                 converter_config = ConverterDoclingConfig(logger=task_logger, code_ocr=payload.code_ocr,
                                                           formula_ocr=payload.formula_ocr)
@@ -1214,6 +1216,7 @@ async def temp_translate(
         temperature: float = Body(default_params["temperature"]),
         thinking: ThinkingMode = Body(default_params["thinking"]),
         chunk_size: int = Body(default_params["chunk_size"]), custom_prompt: Optional[str] = Body(None),
+        model_version: Literal["pipline", "vlm"] = Body("vlm"),
 ):
     file_name = Path(file_name)
     try:
@@ -1222,7 +1225,7 @@ async def temp_translate(
         decoded_content = file_content.encode('utf-8')
     try:
         workflow_config = MarkdownBasedWorkflowConfig(
-            convert_engine="mineru", converter_config=ConverterMineruConfig(mineru_token=mineru_token),
+            convert_engine="mineru", converter_config=ConverterMineruConfig(mineru_token=mineru_token, model_version=model_version),
             translator_config=MDTranslatorConfig(base_url=base_url, api_key=api_key, model_id=model_id,
                                                  to_lang=to_lang, custom_prompt=custom_prompt, temperature=temperature,
                                                  thinking=thinking, chunk_size=chunk_size, concurrent=concurrent),
diff --git a/docutranslate/converter/x2md/converter_mineru.py b/docutranslate/converter/x2md/converter_mineru.py
index 58e1ac2..9956bd7 100644
--- a/docutranslate/converter/x2md/converter_mineru.py
+++ b/docutranslate/converter/x2md/converter_mineru.py
@@ -2,7 +2,7 @@ import asyncio
 import time
 import zipfile
 from dataclasses import dataclass
-from typing import Hashable
+from typing import Hashable, Literal
 
 import httpx
 
@@ -18,9 +18,10 @@ URL = 'https://mineru.net/api/v4/file-urls/batch'
 class ConverterMineruConfig(X2MarkdownConverterConfig):
     mineru_token: str
     formula_ocr: bool = True
+    model_version: Literal["pipline", "vlm"] = "vlm"
 
     def gethash(self) -> Hashable:
-        return self.formula_ocr
+        return (self.formula_ocr,self.model_version)
 
 
 timeout = httpx.Timeout(
@@ -44,6 +45,7 @@ class ConverterMineru(X2MarkdownConverter):
         super().__init__(config=config)
         self.mineru_token = config.mineru_token.strip()
         self.formula = config.formula_ocr
+        self.model_version=config.model_version
 
     def _get_header(self):
         return {
@@ -56,6 +58,7 @@ class ConverterMineru(X2MarkdownConverter):
             "enable_formula": self.formula,
             "language": "auto",
             "enable_table": True,
+            "model_version":self.model_version,
             "files": [
                 {"name": f"{document.name}", "is_ocr": True}
             ]
diff --git a/docutranslate/static/i18nData.json b/docutranslate/static/i18nData.json
index cb88949..412b2b6 100644
--- a/docutranslate/static/i18nData.json
+++ b/docutranslate/static/i18nData.json
@@ -44,6 +44,10 @@
     "engineOptionDocling": "Docling (本地)",
     "getMineruTokenTitle": "获取Mineru Token",
     "mineruTokenPlaceholder": "使用Mineru引擎时需要",
+    "modelVersionLabel": "Mineru 模型版本",
+    "modelVersionVlm": "VLM",
+    "modelVersionPipline": "Pipeline",
+    "modelVersionHelp": "mineru VLM是更新的内测模型。",
     "formulaOcrLabel": "公式识别",
     "codeOcrLabel": "代码识别",
     "aiSettingsTitleText": "翻译模型",
@@ -87,6 +91,14 @@
     "taskCardStartBtn": "开始翻译",
     "downloadMdEmbedded": "Markdown(嵌图)",
     "downloadMdZip": "Markdown压缩包",
+    "downloadTxt": "TXT",
+    "downloadJson": "JSON",
+    "downloadDocx": "DOCX",
+    "downloadXlsx": "XLSX",
+    "downloadSrt": "SRT",
+    "downloadEpub": "EPUB",
+    "downloadHtml": "HTML",
+    "downloadPdf": "PDF",
     "previewTitle": "预览",
     "previewBilingualBtn": "双语",
     "previewTranslatedOnlyBtn": "仅译文",
@@ -95,7 +107,7 @@
     "closeBtn": "关闭",
     "downloadBtn": "下载",
     "tutorialModalTitle": "使用教程",
-    "tutorialModalBody": "<p><i class=\"bi bi-camera-video me-2\"></i>视频教程可以在B站搜索 <a href=\"https://search.bilibili.com/all?keyword=docutranslate\" target=\"_blank\">docutranslate</a> 获取。</p><p>欢迎使用 DocuTranslate！请按照以下步骤完成文档翻译：</p><ol><li><strong><i class=\"bi bi-diagram-3 me-2\"></i>选择工作流</strong><p class=\"mt-2\">首先，在配置面板顶部选择您需要的翻译流程。不同的工作流适用于不同类型的文件：<ul><li><b>转Markdown再翻译</b>: 适用于翻译PDF、markdown、图片等文件。</li><li><b>纯文本翻译</b>: 用于翻译 <code>.txt</code> 等纯文本文件。</li><li><b>JSON翻译</b>: 用于翻译 <code>.json</code> 文件中的特定字段。</li><li><b>DOCX翻译</b>: 用于翻译 <code>.docx</code> 文件。</li><li><b>XLSX翻译</b>: 用于翻译 <code>.xlsx</code> 电子表格文件。</li><li><b>SRT字幕翻译</b>: 用于翻译 <code>.srt</code> 字幕文件。</li><li><b>EPUB翻译</b>: 用于翻译 <code>.epub</code> 电子书文件。</li></ul><div class=\"alert alert-info mt-2\" role=\"alert\"><i class=\"bi bi-lightbulb-fill me-2\"></i>新增功能: \"自动选择工作流\"开关已默认开启。您只需上传文件，系统会自动为您匹配合适的工作流，简化操作。</div></p></li><li><strong><i class=\"bi bi-gear-fill me-2\"></i>配置参数</strong><p class=\"mt-2\">根据您选择的工作流，完成相应的配置。所有配置项都会自动保存在您的浏览器中。</p><ul><li class=\"mb-2\"><strong>解析配置</strong> (仅在“转Markdown再翻译”工作流下显示):<ul class=\"mt-1\"><li><strong>解析引擎</strong>: 选择一个引擎将您的文件（如PDF）转换为适合翻译的Markdown格式。如果您的文件已经是Markdown格式，则无需选择。</li><li><strong>Mineru Token</strong>: 如果您选择 <code>minerU</code> 引擎，需要在此处填入您的Token。</li></ul></li><li class=\"mb-2\"><strong>DOCX/XLSX/SRT/EPUB翻译选项</strong> (在对应工作流下显示):<ul class=\"mt-1\"><li><strong>插入模式</strong>: 定义翻译结果如何放入文档或字幕。您可以选择直接“替换”原文，或是在原文之后“附加”，或是在原文之前“前置”。</li><li><strong>分隔符</strong>: 当选择“附加”或“前置”模式时，此项用于在原文和译文之间插入分隔符。</li></ul></li><li class=\"mb-2\"><strong>JSON路径配置</strong> (仅在“JSON翻译”工作流下显示):<ul class=\"mt-1\"><li><strong>需要翻译的JSON路径</strong>: 每行输入一个 <a href=\"https://goessner.net/articles/JsonPath/\" target=\"_blank\">JSONPath</a> 表达式，指定需要翻译的字段。</li><li>例如:<code>$..description</code>翻译所有键为description的值。<code>$.items[0].name</code>翻译第一个item的name值。</li></ul></li><li class=\"mb-2\"><strong>翻译模型</strong>:<ul class=\"mt-1\"><li><strong>选择平台/API 地址/API Key/模型 ID</strong>: 配置您希望使用的AI翻译服务。</li><li>模型ID参考平台文档，建议使用非推理模型或混合推理模型（关闭思考）。</li></ul></li><li class=\"mb-2\"><strong>翻译配置</strong>:<ul class=\"mt-1\"><li><strong>目标语言/自定义Prompt</strong>: 指定翻译的目标语言和附加指令。</li><li><strong>思考模式</strong>:设置混合推理模型是否进行思考，目前支持智谱的glm4.5系列、阿里云的qwen3系列、火山引擎的seed1.6系列，建议选择禁用思考。</li></ul></li><li class=\"mb-2\"><strong>高级参数</strong>:<ul class=\"mt-1\"><li><strong>分块大小/并发数/Temperature</strong>: 发给ai的分块大小、并发请求数和温度，通常保持默认即可。</li></ul></li></ul></li><li><strong><i class=\"bi bi-file-earmark-arrow-up-fill me-2\"></i>上传文件</strong><p class=\"mt-2\">在右侧的任务列表中，点击或拖拽您的文档到文件上传区域。</p></li><li><strong><i class=\"bi bi-play-circle-fill me-2\"></i>开始翻译</strong><p class=\"mt-2\">文件选择成功后，点击任务卡片右下角的 <span class=\"badge bg-primary\">开始翻译</span> 按钮。系统将开始处理任务，您可以在日志区域查看实时进度。</p></li><li><strong><i class=\"bi bi-check-circle-fill me-2\"></i>查看与下载</strong><p class=\"mt-2\">翻译完成后，任务卡片下方会出现操作按钮：</p><ul><li><span class=\"badge bg-success\"><i class=\"bi bi-eye-fill me-1\"></i>预览</span>: 在右侧滑出的面板中进行原文和译文的对照预览（仅作参考）。</li><li><span class=\"badge bg-secondary\"><i class=\"bi bi-download me-1\"></i>下载</span>: 下载包括 PDF, DOCX, XLSX, HTML, Markdown 等多种格式的译文。</li></ul></li></ol><div class=\"alert alert-info mt-3\" role=\"alert\"><i class=\"bi bi-info-circle-fill me-2\"></i><strong>提示</strong>: 所有配置都会自动保存在您的浏览器本地，方便下次使用。</div>",
+    "tutorialModalBody": "<p><i class=\"bi bi-camera-video me-2\"></i>视频教程可以在B站搜索 <a href=\"https://search.bilibili.com/all?keyword=docutranslate\" target=\"_blank\">docutranslate</a> 获取。</p><p>欢迎使用 DocuTranslate！请按照以下步骤完成文档翻译：</p><ol><li><strong><i class=\"bi bi-diagram-3 me-2\"></i>选择工作流</strong><p class=\"mt-2\">首先，在配置面板顶部选择您需要的翻译流程。不同的工作流适用于不同类型的文件：<ul><li><b>转Markdown再翻译</b>: 适用于翻译PDF、markdown、图片等文件。</li><li><b>纯文本翻译</b>: 用于翻译 <code>.txt</code> 等纯文本文件。</li><li><b>JSON翻译</b>: 用于翻译 <code>.json</code> 文件中的特定字段。</li><li><b>DOCX翻译</b>: 用于翻译 <code>.docx</code> 文件。</li><li><b>XLSX翻译</b>: 用于翻译 <code>.xlsx</code> 电子表格文件。</li><li><b>SRT字幕翻译</b>: 用于翻译 <code>.srt</code> 字幕文件。</li><li><b>EPUB翻译</b>: 用于翻译 <code>.epub</code> 电子书文件。</li><li><b>HTML翻译</b>: 用于翻译 <code>.html</code> 文件。</li></ul><div class=\"alert alert-info mt-2\" role=\"alert\"><i class=\"bi bi-lightbulb-fill me-2\"></i>新增功能: \"自动选择工作流\"开关已默认开启。您只需上传文件，系统会自动为您匹配合适的工作流，简化操作。</div></p></li><li><strong><i class=\"bi bi-gear-fill me-2\"></i>配置参数</strong><p class=\"mt-2\">根据您选择的工作流，完成相应的配置。所有配置项都会自动保存在您的浏览器中。</p><ul><li class=\"mb-2\"><strong>解析配置</strong> (仅在“转Markdown再翻译”工作流下显示):<ul class=\"mt-1\"><li><strong>解析引擎</strong>: 选择一个引擎将您的文件（如PDF）转换为适合翻译的Markdown格式。如果您的文件已经是Markdown格式，则无需选择。</li><li><strong>Mineru Token</strong>: 如果您选择 <code>minerU</code> 引擎，需要在此处填入您的Token。</li></ul></li><li class=\"mb-2\"><strong>DOCX/XLSX/SRT/EPUB/HTML翻译选项</strong> (在对应工作流下显示):<ul class=\"mt-1\"><li><strong>插入模式</strong>: 定义翻译结果如何放入文档或字幕。您可以选择直接“替换”原文，或是在原文之后“附加”，或是在原文之前“前置”。</li><li><strong>分隔符</strong>: 当选择“附加”或“前置”模式时，此项用于在原文和译文之间插入分隔符。</li></ul></li><li class=\"mb-2\"><strong>JSON路径配置</strong> (仅在“JSON翻译”工作流下显示):<ul class=\"mt-1\"><li><strong>需要翻译的JSON路径</strong>: 每行输入一个 <a href=\"https://goessner.net/articles/JsonPath/\" target=\"_blank\">JSONPath</a> 表达式，指定需要翻译的字段。</li><li>例如:<code>$..description</code>翻译所有键为description的值。<code>$.items[0].name</code>翻译第一个item的name值。</li></ul></li><li class=\"mb-2\"><strong>翻译模型</strong>:<ul class=\"mt-1\"><li><strong>选择平台/API 地址/API Key/模型 ID</strong>: 配置您希望使用的AI翻译服务。</li><li>模型ID参考平台文档，建议使用非推理模型或混合推理模型（关闭思考）。</li></ul></li><li class=\"mb-2\"><strong>翻译配置</strong>:<ul class=\"mt-1\"><li><strong>目标语言/自定义Prompt</strong>: 指定翻译的目标语言和附加指令。</li><li><strong>思考模式</strong>:设置混合推理模型是否进行思考，目前支持智谱的glm4.5系列、阿里云的qwen3系列、火山引擎的seed1.6系列，建议选择禁用思考。</li></ul></li><li class=\"mb-2\"><strong>高级参数</strong>:<ul class=\"mt-1\"><li><strong>分块大小/并发数/Temperature</strong>: 发给ai的分块大小、并发请求数和温度，通常保持默认即可。</li></ul></li></ul></li><li><strong><i class=\"bi bi-file-earmark-arrow-up-fill me-2\"></i>上传文件</strong><p class=\"mt-2\">在右侧的任务列表中，点击或拖拽您的文档到文件上传区域。</p></li><li><strong><i class=\"bi bi-play-circle-fill me-2\"></i>开始翻译</strong><p class=\"mt-2\">文件选择成功后，点击任务卡片右下角的 <span class=\"badge bg-primary\">开始翻译</span> 按钮。系统将开始处理任务，您可以在日志区域查看实时进度。</p></li><li><strong><i class=\"bi bi-check-circle-fill me-2\"></i>查看与下载</strong><p class=\"mt-2\">翻译完成后，任务卡片下方会出现操作按钮：</p><ul><li><span class=\"badge bg-success\"><i class=\"bi bi-eye-fill me-1\"></i>预览</span>: 在右侧滑出的面板中进行原文和译文的对照预览（仅作参考）。</li><li><span class=\"badge bg-secondary\"><i class=\"bi bi-download me-1\"></i>下载</span>: 下载包括 PDF, DOCX, XLSX, HTML, Markdown 等多种格式的译文。</li></ul></li></ol><div class=\"alert alert-info mt-3\" role=\"alert\"><i class=\"bi bi-info-circle-fill me-2\"></i><strong>提示</strong>: 所有配置都会自动保存在您的浏览器本地，方便下次使用。</div>",
     "tutorialUnderstandBtn": "我明白了",
     "contributorsModalTitle": "感谢贡献",
     "contributorsPara1": "DocuTranslate是一个开源项目！大家的需求与使用是项目进步的动力。",
@@ -128,7 +140,8 @@
     "pdf_preparing": "PDF准备中，请稍后...",
     "pdf_print_failed": "自动打印失败，请在预览中手动打印。",
     "pdf_fetch_failed": "获取HTML内容失败，无法生成PDF。",
-    "init_failed_alert": "页面初始化失败，请检查后端服务是否正常并刷新页面。",
+    "init_i18n_failed_alert": "加载界面翻译资源失败，请检查网络连接或联系管理员。",
+    "init_failed_alert": "初始化失败，无法连接到后端服务。请检查服务是否运行或刷新页面。",
     "admin_tasklist_failed": "无法从服务器加载任务列表，请检查后台连接。",
     "btn_startTranslation": "开始翻译",
     "btn_initializing": "初始化...",
@@ -180,6 +193,10 @@
     "engineOptionDocling": "Docling (Local)",
     "getMineruTokenTitle": "Get Mineru Token",
     "mineruTokenPlaceholder": "Required for Mineru engine",
+    "modelVersionLabel": "Mineru Model Version",
+    "modelVersionVlm": "VLM",
+    "modelVersionPipline": "Pipeline",
+    "modelVersionHelp": "Mineru VLM is a newer internal beta model.",
     "formulaOcrLabel": "Formula Recognition",
     "codeOcrLabel": "Code Recognition",
     "aiSettingsTitleText": "Translation Model",
@@ -223,6 +240,14 @@
     "taskCardStartBtn": "Start Translation",
     "downloadMdEmbedded": "Markdown (Embedded Img)",
     "downloadMdZip": "Markdown (.zip)",
+    "downloadTxt": "TXT",
+    "downloadJson": "JSON",
+    "downloadDocx": "DOCX",
+    "downloadXlsx": "XLSX",
+    "downloadSrt": "SRT",
+    "downloadEpub": "EPUB",
+    "downloadHtml": "HTML",
+    "downloadPdf": "PDF",
     "previewTitle": "Preview",
     "previewBilingualBtn": "Bilingual",
     "previewTranslatedOnlyBtn": "Translated Only",
@@ -231,7 +256,7 @@
     "closeBtn": "Close",
     "downloadBtn": "Download",
     "tutorialModalTitle": "Tutorial",
-    "tutorialModalBody": "<p><i class=\"bi bi-camera-video me-2\"></i>Video tutorials can be found by searching <a href=\"https://search.bilibili.com/all?keyword=docutranslate\" target=\"_blank\">docutranslate on Bilibili</a></a>.</p><p>Welcome to DocuTranslate! Follow these steps to translate your documents:</p><ol><li><strong><i class=\"bi bi-diagram-3 me-2\"></i>Select Workflow</strong><p class=\"mt-2\">First, choose the translation process you need from the top of the settings panel. Different workflows are for different file types:<ul><li><b>Markdown-based</b>: For translating PDF, markdown, images, etc.</li><li><b>Plain Text</b>: For translating <code>.txt</code> and other plain text files.</li><li><b>JSON</b>: For translating specific fields in <code>.json</code> files.</li><li><b>DOCX</b>: For translating <code>.docx</code> files.</li><li><b>XLSX</b>: For translating <code>.xlsx</code> spreadsheet files.</li><li><b>SRT Subtitle</b>: For translating <code>.srt</code> subtitle files.</li><li><b>EPUB</b>: For translating <code>.epub</code> ebook files.</li></ul><div class=\"alert alert-info mt-2\" role=\"alert\"><i class=\"bi bi-lightbulb-fill me-2\"></i>New Feature: \"Auto-select workflow\" is on by default. Just upload your file, and the system will automatically pick the right workflow for you.</div></p></li><li><strong><i class=\"bi bi-gear-fill me-2\"></i>Configure Parameters</strong><p class=\"mt-2\">Based on your chosen workflow, complete the necessary settings. All settings are automatically saved in your browser.</p><ul><li class=\"mb-2\"><strong>Parsing Configuration</strong> (Only for \"Markdown-based\" workflow):<ul class=\"mt-1\"><li><strong>Parsing Engine</strong>: Choose an engine to convert your file (like a PDF) into a translation-friendly Markdown format. Not needed if your file is already Markdown.</li><li><strong>Mineru Token</strong>: If you select the <code>minerU</code> engine, you need to enter your token here.</li></ul></li><li class=\"mb-2\"><strong>DOCX/XLSX/SRT/EPUB Options</strong> (For their respective workflows):<ul class=\"mt-1\"><li><strong>Insert Mode</strong>: Define how the translation is placed in the document. You can \"Replace\" the original, \"Append\" after it, or \"Prepend\" before it.</li><li><strong>Separator</strong>: When using \"Append\" or \"Prepend\", this is used to separate the original and translated text.</li></ul></li><li class=\"mb-2\"><strong>JSON Path Configuration</strong> (Only for \"JSON\" workflow):<ul class=\"mt-1\"><li><strong>JSON paths to translate</strong>: Enter one <a href=\"https://goessner.net/articles/JsonPath/\" target=\"_blank\">JSONPath</a> expression per line to specify which fields to translate.</li><li>E.g., <code>$..description</code> translates all values with the key 'description'. <code>$.items[0].name</code> translates the name of the first item.</li></ul></li><li class=\"mb-2\"><strong>Translation Model</strong>:<ul class=\"mt-1\"><li><strong>Platform/API Base URL/API Key/Model ID</strong>: Configure the AI translation service you want to use.</li><li>Refer to the platform's documentation for Model IDs. It's recommended to use non-inference models or mixed-inference models (with thinking turned off).</li></ul></li><li class=\"mb-2\"><strong>Translation Configuration</strong>:<ul class=\"mt-1\"><li><strong>Target Language/Custom Prompt</strong>: Specify the target language and any additional instructions.</li><li><strong>Thinking Mode</strong>: Sets whether a mixed-inference model should 'think'. Supported for Zhipu's glm4.5 series, Alibaba's qwen3 series, VolcEngine's seed1.6 series, etc. Disabling is recommended.</li></ul></li><li class=\"mb-2\"><strong>Advanced Parameters</strong>:<ul class=\"mt-1\"><li><strong>Chunk Size/Concurrency/Temperature</strong>: The size of text chunks sent to the AI, number of concurrent requests, and creativity level. Default values usually work fine.</li></ul></li></ul></li><li><strong><i class=\"bi bi-file-earmark-arrow-up-fill me-2\"></i>Upload File</strong><p class=\"mt-2\">In the task list on the right, click or drag your document into the file drop area.</p></li><li><strong><i class=\"bi bi-play-circle-fill me-2\"></i>Start Translation</strong><p class=\"mt-2\">Once the file is selected, click the <span class=\"badge bg-primary\">Start Translation</span> button on the task card. The system will start processing, and you can see real-time progress in the log area.</p></li><li><strong><i class=\"bi bi-check-circle-fill me-2\"></i>Review & Download</strong><p class=\"mt-2\">After translation is complete, action buttons will appear on the task card:</p><ul><li><span class=\"badge bg-success\"><i class=\"bi bi-eye-fill me-1\"></i>Preview</span>: Opens a side panel for a side-by-side preview of the original and translation (for reference only).</li><li><span class=\"badge bg-secondary\"><i class=\"bi bi-download me-1\"></i>Download</span>: Download the translation in various formats, including PDF, DOCX, XLSX, HTML, and Markdown.</li></ul></li></ol><div class=\"alert alert-info mt-3\" role=\"alert\"><i class=\"bi bi-info-circle-fill me-2\"></i><strong>Tip</strong>: All your settings are automatically saved in your browser's local storage for your next visit.</div>",
+    "tutorialModalBody": "<p><i class=\"bi bi-camera-video me-2\"></i>Video tutorials can be found by searching <a href=\"https://search.bilibili.com/all?keyword=docutranslate\" target=\"_blank\">docutranslate</a> on Bilibili.</p><p>Welcome to DocuTranslate! Follow these steps to translate your documents:</p><ol><li><strong><i class=\"bi bi-diagram-3 me-2\"></i>Select Workflow</strong><p class=\"mt-2\">First, choose the translation process you need from the top of the settings panel. Different workflows are for different file types:<ul><li><b>Markdown-based</b>: For translating PDF, markdown, images, etc.</li><li><b>Plain Text</b>: For translating <code>.txt</code> and other plain text files.</li><li><b>JSON</b>: For translating specific fields in <code>.json</code> files.</li><li><b>DOCX</b>: For translating <code>.docx</code> files.</li><li><b>XLSX</b>: For translating <code>.xlsx</code> spreadsheet files.</li><li><b>SRT Subtitle</b>: For translating <code>.srt</code> subtitle files.</li><li><b>EPUB</b>: For translating <code>.epub</code> ebook files.</li><li><b>HTML</b>: For translating <code>.html</code> files.</li></ul><div class=\"alert alert-info mt-2\" role=\"alert\"><i class=\"bi bi-lightbulb-fill me-2\"></i>New Feature: \"Auto-select workflow\" is on by default. Just upload your file, and the system will automatically pick the right workflow for you, simplifying the process.</div></p></li><li><strong><i class=\"bi bi-gear-fill me-2\"></i>Configure Parameters</strong><p class=\"mt-2\">Based on your chosen workflow, complete the necessary settings. All settings are automatically saved in your browser.</p><ul><li class=\"mb-2\"><strong>Parsing Configuration</strong> (Only for \"Markdown-based\" workflow):<ul class=\"mt-1\"><li><strong>Parsing Engine</strong>: Choose an engine to convert your file (like a PDF) into a translation-friendly Markdown format. Not needed if your file is already Markdown.</li><li><strong>Mineru Token</strong>: If you select the <code>minerU</code> engine, you need to enter your token here.</li></ul></li><li class=\"mb-2\"><strong>DOCX/XLSX/SRT/EPUB/HTML Options</strong> (For their respective workflows):<ul class=\"mt-1\"><li><strong>Insert Mode</strong>: Define how the translation is placed in the document. You can \"Replace\" the original, \"Append\" after it, or \"Prepend\" before it.</li><li><strong>Separator</strong>: When using \"Append\" or \"Prepend\", this is used to separate the original and translated text.</li></ul></li><li class=\"mb-2\"><strong>JSON Path Configuration</strong> (Only for \"JSON\" workflow):<ul class=\"mt-1\"><li><strong>JSON paths to translate</strong>: Enter one <a href=\"https://goessner.net/articles/JsonPath/\" target=\"_blank\">JSONPath</a> expression per line to specify which fields to translate.</li><li>E.g., <code>$..description</code> translates all values with the key 'description'. <code>$.items[0].name</code> translates the name of the first item.</li></ul></li><li class=\"mb-2\"><strong>Translation Model</strong>:<ul class=\"mt-1\"><li><strong>Platform/API Base URL/API Key/Model ID</strong>: Configure the AI translation service you want to use.</li><li>Refer to the platform's documentation for Model IDs. It's recommended to use non-inference models or mixed-inference models (with thinking turned off).</li></ul></li><li class=\"mb-2\"><strong>Translation Configuration</strong>:<ul class=\"mt-1\"><li><strong>Target Language/Custom Prompt</strong>: Specify the target language and any additional instructions.</li><li><strong>Thinking Mode</strong>: Sets whether a mixed-inference model should 'think'. Supported for Zhipu's glm4.5 series, Alibaba's qwen3 series, VolcEngine's seed1.6 series, etc. Disabling is recommended.</li></ul></li><li class=\"mb-2\"><strong>Advanced Parameters</strong>:<ul class=\"mt-1\"><li><strong>Chunk Size/Concurrency/Temperature</strong>: The size of text chunks sent to the AI, number of concurrent requests, and creativity level. Default values usually work fine.</li></ul></li></ul></li><li><strong><i class=\"bi bi-file-earmark-arrow-up-fill me-2\"></i>Upload File</strong><p class=\"mt-2\">In the task list on the right, click or drag your document into the file drop area.</p></li><li><strong><i class=\"bi bi-play-circle-fill me-2\"></i>Start Translation</strong><p class=\"mt-2\">Once the file is selected, click the <span class=\"badge bg-primary\">Start Translation</span> button on the task card. The system will start processing, and you can see real-time progress in the log area.</p></li><li><strong><i class=\"bi bi-check-circle-fill me-2\"></i>Review & Download</strong><p class=\"mt-2\">After translation is complete, action buttons will appear on the task card:</p><ul><li><span class=\"badge bg-success\"><i class=\"bi bi-eye-fill me-1\"></i>Preview</span>: Opens a side panel for a side-by-side preview of the original and translation (for reference only).</li><li><span class=\"badge bg-secondary\"><i class=\"bi bi-download me-1\"></i>Download</span>: Download the translation in various formats, including PDF, DOCX, XLSX, HTML, and Markdown.</li></ul></li></ol><div class=\"alert alert-info mt-3\" role=\"alert\"><i class=\"bi bi-info-circle-fill me-2\"></i><strong>Tip</strong>: All your settings are automatically saved in your browser's local storage for your next visit.</div>",
     "tutorialUnderstandBtn": "Got it",
     "contributorsModalTitle": "Thanks for Contributing",
     "contributorsPara1": "DocuTranslate is an open-source project! The community's needs and usage are what drive its progress.",
@@ -264,7 +289,8 @@
     "pdf_preparing": "Preparing PDF, please wait...",
     "pdf_print_failed": "Automatic printing failed. Please print manually from the preview.",
     "pdf_fetch_failed": "Failed to fetch HTML content, cannot generate PDF.",
-    "init_failed_alert": "Page initialization failed. Please check if the backend service is running and refresh the page.",
+    "init_i18n_failed_alert": "Failed to load interface translations. Please check your network connection or contact an administrator.",
+    "init_failed_alert": "Initialization failed, could not connect to the backend service. Please ensure the service is running and refresh the page.",
     "admin_tasklist_failed": "Could not load task list from server. Please check backend connection.",
     "btn_startTranslation": "Start Translation",
     "btn_initializing": "Initializing...",
diff --git a/docutranslate/static/index.html b/docutranslate/static/index.html
index f046344..708d303 100644
--- a/docutranslate/static/index.html
+++ b/docutranslate/static/index.html
@@ -1 +1 @@
-<!DOCTYPE html>
<html lang="zh-CN" data-bs-theme="auto">
<head>
    <meta charset="UTF-8">
    <meta name="viewport" content="width=device-width, initial-scale=1.0">

    <title data-i18n-title="pageTitle">DocuTranslate - 交互式文档翻译</title>
    <link rel="icon" href="/static/favicon.ico" type="image/x-icon">
    <!-- Bootstrap CSS -->
    <link href="/static/bootstrap.css" rel="stylesheet" crossorigin="anonymous">
    <!-- Bootstrap Icons -->
    <link rel="stylesheet" href="/static/bootstrap-icons.css">

    <style>
        body {
            background-color: var(--bs-body-bg);
        }

        .main-container {
            display: flex;
            flex-direction: column;
            height: 100vh;
            padding-top: 1rem;
            padding-bottom: 1rem;
        }

        .settings-panel {
            height: calc(100vh - 2rem);
            overflow-y: auto;
            padding-right: 15px; /* for scrollbar */
        }

        .task-area {
            height: calc(100vh - 2rem);
            overflow-y: auto;
        }

        .task-card {
            transition: all 0.3s ease-in-out;
        }

        .task-id-placeholder {
            color: var(--bs-secondary-color);
            font-style: italic;
        }

        .log-area {
            height: 150px;
            background-color: var(--bs-tertiary-bg);
            border: 1px solid var(--bs-border-color);
            border-radius: .375rem;
            font-family: monospace;
            font-size: 0.8rem;
            padding: 10px;
            overflow-y: auto;
            white-space: pre-wrap;
            word-break: break-all;
        }

        .file-drop-area {
            border: 2px dashed var(--bs-secondary-bg);
            border-radius: .375rem;
            padding: 2rem;
            text-align: center;
            cursor: pointer;
            transition: all 0.2s ease-in-out;
            background-color: var(--bs-body-bg);
        }

        .file-drop-area.drag-over {
            border-color: var(--bs-primary);
            background-color: var(--bs-secondary-bg);
        }

        .file-drop-area.file-selected {
            border-style: solid;
            border-color: var(--bs-success);
            background-color: var(--bs-success-bg-subtle);
        }

        .file-drop-area.input-error {
            border-color: var(--bs-danger);
        }

        .file-name-display.input-error-text {
            color: var(--bs-danger);
            font-weight: bold;
        }

        #printFrame, #translatedPreviewFrame {
            border: none;
            width: 100%;
        }

        #previewOffcanvas {
            --bs-offcanvas-width: 95vw;
            max-width: 1600px;
        }

        .preview-split-container {
            display: flex;
            flex-direction: row;
            height: 90%;
        }

        .preview-pane-wrapper {
            display: flex;
            flex-direction: column;
            overflow: hidden; /* Important for split.js */
        }

        .preview-pane-wrapper h6 {
            flex-shrink: 0;
            padding: 0.25rem;
        }

        .preview-pane-wrapper .preview-pane {
            flex-grow: 1; /* Make the inner pane grow */
            border: 1px solid var(--bs-border-color);
            border-radius: .375rem;
            overflow: auto;
        }

        .gutter {
            background-color: var(--bs-tertiary-bg);
            background-repeat: no-repeat;
            background-position: 50%;
        }

        .gutter.gutter-horizontal {
            cursor: col-resize;
            border-left: 1px solid var(--bs-border-color);
            border-right: 1px solid var(--bs-border-color);
        }

        .gutter.gutter-vertical {
            cursor: row-resize;
            border-top: 1px solid var(--bs-border-color);
            border-bottom: 1px solid var(--bs-border-color);
        }


        .preview-pane iframe, .preview-pane pre {
            width: 100%;
            height: 95%;
            border: none;
            margin: 0;
            padding: 0;
            overflow: auto;
            background-color: var(--bs-body-bg);
        }

        .slider-reset-btn {
            visibility: hidden;
        }

        .bottom-left-controls {
            position: fixed;
            bottom: 1rem;
            left: 1rem;
            z-index: 1050;
            display: flex;
            gap: 0.5rem;
        }

        @media (max-width: 991.98px) {
            .main-container {
                height: auto;
                padding-bottom: 6rem;
            }

            .settings-panel, .task-area {
                height: auto;
                overflow-y: visible;
            }

            .settings-panel {
                padding-right: 0;
                margin-bottom: 2rem;
            }
        }

        @media (max-width: 767.98px) {
            .task-card .col-md-7 {
                margin-top: 1.5rem;
            }

            #previewOffcanvas {
                --bs-offcanvas-width: 100vw;
            }
        }
    </style>
</head>
<body>

<div class="container-fluid main-container">
    <div class="row gx-4">
        <!-- Left: Settings Panel -->
        <div class="col-lg-4">
            <div class="settings-panel">
                <div class="d-flex justify-content-between align-items-center mb-3">
                    <div class="d-flex align-items-center">
                        <h4 class="mb-0 me-3"><i class="bi"></i>DocuTranslate</h4>
                        <span id="versionDisplay" class="badge bg-success me-4"></span>
                        <div class="btn-group">
                            <button type="button" class="btn btn-sm btn-outline-info" data-bs-toggle="modal"
                                    data-bs-target="#tutorialModal">
                                <i class="bi bi-question-circle-fill me-1"></i><span data-i18n="tutorialBtn">教程</span>
                            </button>
                            <button type="button" class="btn btn-sm btn-outline-warning" data-bs-toggle="modal"
                                    data-bs-target="#contributorsModal">
                                <i class="bi bi-people-fill me-1"></i><span
                                    data-i18n="projectContributeBtn">项目协作</span>
                            </button>
                        </div>
                    </div>
                </div>

                <form id="translateForm">
                    <div class="accordion" id="settingsAccordion">

                        <!-- Workflow Selection -->
                        <div class="accordion-item" id="workflowSettingsContainer">
                            <h2 class="accordion-header" id="headingZero">
                                <button class="accordion-button" type="button" data-bs-toggle="collapse"
                                        data-bs-target="#collapseZero" aria-expanded="true"
                                        aria-controls="collapseZero">
                                    <strong><i class="bi bi-diagram-3 me-2"></i><span
                                            data-i18n="workflowTitle">1. 选择工作流</span></strong>
                                </button>
                            </h2>
                            <div id="collapseZero" class="accordion-collapse collapse show"
                                 aria-labelledby="headingZero">
                                <div class="accordion-body">
                                    <select class="form-select" id="workflowTypeSelect">
                                        <option value="markdown_based" data-i18n="workflowOptionMarkdown">转Markdown再翻译
                                            (.pdf/.md/.png等)
                                        </option>
                                        <option value="txt" data-i18n="workflowOptionTxt">纯文本翻译 (.txt)</option>
                                        <option value="json" data-i18n="workflowOptionJson">JSON翻译 (.json)</option>
                                        <option value="docx" data-i18n="workflowOptionDocx">DOCX翻译 (.docx)</option>
                                        <option value="xlsx" data-i18n="workflowOptionXlsx">XLSX翻译 (.xlsx)</option>
                                        <option value="srt" data-i18n="workflowOptionSrt">SRT字幕翻译 (.srt)</option>
                                        <option value="epub" data-i18n="workflowOptionEpub">EPUB翻译 (.epub)</option>
                                        <option value="html" data-i18n="workflowOptionHtml">HTML翻译 (.html)</option>
                                    </select>
                                    <div class="form-check form-switch mt-2">
                                        <input class="form-check-input" type="checkbox" role="switch"
                                               id="autoWorkflowSwitch">
                                        <label class="form-check-label" for="autoWorkflowSwitch"
                                               data-i18n="autoWorkflowLabel">自动选择工作流</label>
                                    </div>
                                </div>
                            </div>
                        </div>

                        <!-- [NEW] DOCX Settings Container -->
                        <div class="accordion-item" id="docxSettingsContainer" style="display: none;">
                            <h2 class="accordion-header" id="headingDocx">
                                <button class="accordion-button collapsed" type="button" data-bs-toggle="collapse"
                                        data-bs-target="#collapseDocx" aria-expanded="false"
                                        aria-controls="collapseDocx">
                                    <strong id="docxSettingsTitle"><i class="bi bi-file-earmark-word-fill me-2"></i>2.
                                        DOCX翻译选项</strong>
                                </button>
                            </h2>
                            <div id="collapseDocx" class="accordion-collapse collapse" aria-labelledby="headingDocx">
                                <div class="accordion-body">
                                    <div class="mb-3">
                                        <label for="docx_insert_mode" class="form-label" data-i18n="insertModeLabel">插入模式</label>
                                        <select class="form-select" id="docx_insert_mode" name="insert_mode">
                                            <option value="replace" data-i18n="insertModeReplace">替换原文 (Replace)
                                            </option>
                                            <option value="append" data-i18n="insertModeAppend">附加到原文后 (Append)
                                            </option>
                                            <option value="prepend" data-i18n="insertModePrepend">附加到原文前
                                                (Prepend)
                                            </option>
                                        </select>
                                        <div class="form-text" data-i18n="insertModeHelpDocx">
                                            选择如何将翻译后的文本插入。
                                        </div>
                                    </div>
                                    <div class="mb-3" id="docxSeparatorGroup" style="display: none;">
                                        <label for="docx_separator" class="form-label"
                                               data-i18n="separatorLabel">分隔符</label>
                                        <input type="text" class="form-control" id="docx_separator" name="separator"
                                               data-i18n-placeholder="separatorPlaceholder"
                                               placeholder="例如: \n---翻译---\n">
                                        <div class="form-text" data-i18n="separatorHelp">
                                            当插入模式为附加或前置时，用于分隔原文和译文的字符。<code>\n</code> 代表换行。
                                        </div>
                                    </div>
                                </div>
                            </div>
                        </div>

                        <!-- XLSX Settings Container -->
                        <div class="accordion-item" id="xlsxSettingsContainer" style="display: none;">
                            <h2 class="accordion-header" id="headingXlsx">
                                <button class="accordion-button collapsed" type="button" data-bs-toggle="collapse"
                                        data-bs-target="#collapseXlsx" aria-expanded="false"
                                        aria-controls="collapseXlsx">
                                    <strong id="xlsxSettingsTitle"><i
                                            class="bi bi-file-earmark-spreadsheet-fill me-2"></i>2.
                                        XLSX翻译选项</strong>
                                </button>
                            </h2>
                            <div id="collapseXlsx" class="accordion-collapse collapse" aria-labelledby="headingXlsx">
                                <div class="accordion-body">
                                    <div class="mb-3">
                                        <label for="xlsx_insert_mode" class="form-label" data-i18n="insertModeLabel">插入模式</label>
                                        <select class="form-select" id="xlsx_insert_mode" name="insert_mode">
                                            <option value="replace" data-i18n="insertModeReplace">替换原文 (Replace)
                                            </option>
                                            <option value="append" data-i18n="insertModeAppend">附加到原文后 (Append)
                                            </option>
                                            <option value="prepend" data-i18n="insertModePrepend">附加到原文前
                                                (Prepend)
                                            </option>
                                        </select>
                                        <div class="form-text" data-i18n="insertModeHelpXlsx">
                                            选择如何将翻译后的文本插入到单元格中。
                                        </div>
                                    </div>
                                    <div class="mb-3" id="xlsxSeparatorGroup" style="display: none;">
                                        <label for="xlsx_separator" class="form-label"
                                               data-i18n="separatorLabel">分隔符</label>
                                        <input type="text" class="form-control" id="xlsx_separator" name="separator"
                                               data-i18n-placeholder="separatorPlaceholderSimple"
                                               placeholder="例如: \n---\n">
                                        <div class="form-text" data-i18n="separatorHelp">
                                            当插入模式为附加或前置时，用于分隔原文和译文的字符。<code>\n</code> 代表换行。
                                        </div>
                                    </div>
                                </div>
                            </div>
                        </div>

                        <!-- [NEW] SRT Settings Container -->
                        <div class="accordion-item" id="srtSettingsContainer" style="display: none;">
                            <h2 class="accordion-header" id="headingSrt">
                                <button class="accordion-button collapsed" type="button" data-bs-toggle="collapse"
                                        data-bs-target="#collapseSrt" aria-expanded="false"
                                        aria-controls="collapseSrt">
                                    <strong id="srtSettingsTitle"><i class="bi bi-filetype-srt me-2"></i>2.
                                        SRT翻译选项</strong>
                                </button>
                            </h2>
                            <div id="collapseSrt" class="accordion-collapse collapse" aria-labelledby="headingSrt">
                                <div class="accordion-body">
                                    <div class="mb-3">
                                        <label for="srt_insert_mode" class="form-label"
                                               data-i18n="insertModeLabel">插入模式</label>
                                        <select class="form-select" id="srt_insert_mode" name="insert_mode">
                                            <option value="replace" data-i18n="insertModeReplace">替换原文 (Replace)
                                            </option>
                                            <option value="append" data-i18n="insertModeAppend">附加到原文后 (Append)
                                            </option>
                                            <option value="prepend" data-i18n="insertModePrepend">附加到原文前
                                                (Prepend)
                                            </option>
                                        </select>
                                        <div class="form-text" data-i18n="insertModeHelpSrt">
                                            选择如何将翻译后的文本插入。
                                        </div>
                                    </div>
                                    <div class="mb-3" id="srtSeparatorGroup" style="display: none;">
                                        <label for="srt_separator" class="form-label"
                                               data-i18n="separatorLabel">分隔符</label>
                                        <input type="text" class="form-control" id="srt_separator" name="separator"
                                               data-i18n-placeholder="separatorPlaceholderSimple"
                                               placeholder="例如: \n---\n">
                                        <div class="form-text" data-i18n="separatorHelp">
                                            当插入模式为附加或前置时，用于分隔原文和译文的字符。<code>\n</code> 代表换行。
                                        </div>
                                    </div>
                                </div>
                            </div>
                        </div>

                        <!-- [NEW] EPUB Settings Container -->
                        <div class="accordion-item" id="epubSettingsContainer" style="display: none;">
                            <h2 class="accordion-header" id="headingEpub">
                                <button class="accordion-button collapsed" type="button" data-bs-toggle="collapse"
                                        data-bs-target="#collapseEpub" aria-expanded="false"
                                        aria-controls="collapseEpub">
                                    <strong id="epubSettingsTitle"><i class="bi bi-book me-2"></i>2.
                                        EPUB翻译选项</strong>
                                </button>
                            </h2>
                            <div id="collapseEpub" class="accordion-collapse collapse" aria-labelledby="headingEpub">
                                <div class="accordion-body">
                                    <div class="mb-3">
                                        <label for="epub_insert_mode" class="form-label" data-i18n="insertModeLabel">插入模式</label>
                                        <select class="form-select" id="epub_insert_mode" name="insert_mode">
                                            <option value="replace" data-i18n="insertModeReplace">替换原文 (Replace)
                                            </option>
                                            <option value="append" data-i18n="insertModeAppend">附加到原文后 (Append)
                                            </option>
                                            <option value="prepend" data-i18n="insertModePrepend">附加到原文前
                                                (Prepend)
                                            </option>
                                        </select>
                                        <div class="form-text" data-i18n="insertModeHelpEpub">
                                            选择如何将翻译后的文本插入。
                                        </div>
                                    </div>
                                    <div class="mb-3" id="epubSeparatorGroup" style="display: none;">
                                        <label for="epub_separator" class="form-label"
                                               data-i18n="separatorLabel">分隔符</label>
                                        <input type="text" class="form-control" id="epub_separator" name="separator"
                                               data-i18n-placeholder="separatorPlaceholderSimple"
                                               placeholder="例如: \n---\n">
                                        <div class="form-text" data-i18n="separatorHelp">
                                            当插入模式为附加或前置时，用于分隔原文和译文的字符。<code>\n</code> 代表换行。
                                        </div>
                                    </div>
                                </div>
                            </div>
                        </div>

                        <!-- [NEW] HTML Settings Container -->
                        <div class="accordion-item" id="htmlSettingsContainer" style="display: none;">
                            <h2 class="accordion-header" id="headingHtml">
                                <button class="accordion-button collapsed" type="button" data-bs-toggle="collapse"
                                        data-bs-target="#collapseHtml" aria-expanded="false"
                                        aria-controls="collapseHtml">
                                    <strong id="htmlSettingsTitle"><i class="bi bi-filetype-html me-2"></i>2.
                                        HTML翻译选项</strong>
                                </button>
                            </h2>
                            <div id="collapseHtml" class="accordion-collapse collapse" aria-labelledby="headingHtml">
                                <div class="accordion-body">
                                    <div class="mb-3">
                                        <label for="html_insert_mode" class="form-label" data-i18n="insertModeLabel">插入模式</label>
                                        <select class="form-select" id="html_insert_mode" name="insert_mode">
                                            <option value="replace" data-i18n="insertModeReplace">替换原文 (Replace)
                                            </option>
                                            <option value="append" data-i18n="insertModeAppend">附加到原文后 (Append)
                                            </option>
                                            <option value="prepend" data-i18n="insertModePrepend">附加到原文前
                                                (Prepend)
                                            </option>
                                        </select>
                                        <div class="form-text" data-i18n="insertModeHelpHtml">
                                            选择如何将翻译后的文本插入。
                                        </div>
                                    </div>
                                    <div class="mb-3" id="htmlSeparatorGroup" style="display: none;">
                                        <label for="html_separator" class="form-label"
                                               data-i18n="separatorLabel">分隔符</label>
                                        <input type="text" class="form-control" id="html_separator" name="separator"
                                               data-i18n-placeholder="separatorPlaceholderSimple"
                                               placeholder="例如: <!-- translated -->">
                                        <div class="form-text" data-i18n="separatorHelp">
                                            当插入模式为附加或前置时，用于分隔原文和译文的字符。<code>\n</code> 代表换行。
                                        </div>
                                    </div>
                                </div>
                            </div>
                        </div>


                        <!-- JSON Paths Settings Container -->
                        <div class="accordion-item" id="jsonSettingsContainer" style="display: none;">
                            <h2 class="accordion-header" id="headingJson">
                                <button class="accordion-button collapsed" type="button" data-bs-toggle="collapse"
                                        data-bs-target="#collapseJson" aria-expanded="false"
                                        aria-controls="collapseJson">
                                    <strong id="jsonSettingsTitle"><i class="bi bi-signpost-split me-2"></i>2. JSON路径配置</strong>
                                </button>
                            </h2>
                            <div id="collapseJson" class="accordion-collapse collapse" aria-labelledby="headingJson">
                                <div class="accordion-body">
                                    <div class="mb-3">
                                        <label for="json_paths_textarea" class="form-label" data-i18n="jsonPathLabel">需要翻译的JSON路径</label>
                                        <textarea class="form-control" id="json_paths_textarea" name="json_paths"
                                                  rows="4" required
                                                  data-i18n-placeholder="jsonPathPlaceholder" placeholder="每行一个路径, 例如:
$.name
$.*"></textarea>
                                        <div class="form-text" data-i18n="jsonPathHelp">
                                            采用<code>jsonpath-ng</code>的路径选择语法，每一行表示一个json路径
                                        </div>
                                    </div>
                                </div>
                            </div>
                        </div>

                        <!-- Parsing Engine Settings Container -->
                        <div class="accordion-item" id="parsingSettingsContainer">
                            <h2 class="accordion-header" id="headingOne">
                                <button class="accordion-button collapsed" type="button" data-bs-toggle="collapse"
                                        data-bs-target="#collapseOne" aria-expanded="false" aria-controls="collapseOne">
                                    <strong id="parsingSettingsTitle"><i class="bi bi-file-earmark-binary me-2"></i>2.
                                        解析配置</strong>
                                </button>
                            </h2>
                            <div id="collapseOne" class="accordion-collapse collapse" aria-labelledby="headingOne">
                                <div class="accordion-body">
                                    <div class="mb-3">
                                        <label for="convert_engine" class="form-label" data-i18n="parsingEngineLabel">解析引擎</label>
                                        <select class="form-select" id="convert_engine" name="convert_engine">
                                            <!-- Options will be populated by JS -->
                                        </select>
                                        <div class="form-text" data-i18n="parsingEngineHelp">
                                            如果上传的文件本身是.md格式，此项可不选。
                                        </div>
                                    </div>
                                    <div class="mb-3" id="mineruTokenGroup">
                                        <label for="mineru_token" class="form-label">
                                            Mineru Token
                                            <a href="https://mineru.net/apiManage/token" target="_blank" class="ms-1"
                                               data-i18n-title="getMineruTokenTitle" title="获取Mineru Token"><i
                                                    class="bi bi-box-arrow-up-right"></i></a>
                                        </label>
                                        <div class="input-group">
                                            <input type="password" class="form-control" id="mineru_token"
                                                   name="mineru_token" data-i18n-placeholder="mineruTokenPlaceholder"
                                                   placeholder="使用Mineru引擎时需要">
                                            <button class="btn btn-outline-secondary toggle-password" type="button"
                                                    data-target="mineru_token">
                                                <i class="bi bi-eye-slash"></i>
                                            </button>
                                        </div>

                                    </div>
                                    <div class="form-check form-switch mb-2">
                                        <input class="form-check-input" type="checkbox" role="switch"
                                               id="formula_ocr"
                                               name="formula_ocr" checked>
                                        <label class="form-check-label" for="formula_ocr" data-i18n="formulaOcrLabel">公式识别</label>
                                    </div>
                                    <div class="form-check form-switch mb-2" id="codeOcrSwitch">
                                        <input class="form-check-input" type="checkbox" role="switch" id="code_ocr"
                                               name="code_ocr" checked>
                                        <label class="form-check-label" for="code_ocr"
                                               data-i18n="codeOcrLabel">代码识别</label>
                                    </div>
                                </div>
                            </div>
                        </div>

                        <!-- AI Settings -->
                        <div class="accordion-item">
                            <h2 class="accordion-header" id="headingTwo">
                                <button class="accordion-button collapsed" type="button" data-bs-toggle="collapse"
                                        data-bs-target="#collapseTwo" aria-expanded="false" aria-controls="collapseTwo">
                                    <strong id="aiSettingsTitle"><i class="bi bi-robot me-2"></i>3. 翻译模型</strong>
                                </button>
                            </h2>
                            <div id="collapseTwo" class="accordion-collapse collapse" aria-labelledby="headingTwo">
                                <div class="accordion-body">
                                    <div class="mb-3">
                                        <label for="platform_select" class="form-label"
                                               data-i18n="platformLabel">选择平台</label>
                                        <select class="form-select" id="platform_select">
                                            <option value="custom" data-i18n="platformCustom">自定义接口</option>
                                            <option value="https://api.openai.com/v1">OpenAI</option>
                                            <option value="https://generativelanguage.googleapis.com/v1beta/openai/">
                                                Gemini
                                            </option>
                                            <option value="https://open.bigmodel.cn/api/paas/v4">智谱AI</option>
                                            <option value="https://api.deepseek.com/v1">DeepSeek</option>
                                            <option value="https://dashscope.aliyuncs.com/compatible-mode/v1">
                                                阿里云百炼
                                            </option>
                                            <option value="https://www.dmxapi.cn/v1">DMXAPI</option>
                                            <option value="https://openrouter.ai/api/v1">OpenRouter</option>
                                            <option value="https://ark.cn-beijing.volces.com/api/v3">火山引擎</option>
                                            <option value="https://api.siliconflow.cn/v1">硅基流动</option>
                                        </select>
                                    </div>
                                    <div class="mb-3" id="baseUrlGroup">
                                        <label for="base_url" class="form-label" data-i18n="baseUrlLabel">API 地址 (Base
                                            URL)</label>
                                        <input type="url" class="form-control" id="base_url" name="base_url" required
                                               data-i18n-placeholder="baseUrlPlaceholder" placeholder="OpenAi兼容地址">
                                    </div>
                                    <div class="mb-3">
                                        <label for="api_key" class="form-label">
                                            API Key
                                            <a href="#" target="_blank" class="ms-1" id="api_href"
                                               data-i18n-title="getApiKeyTitle" title="获取API Key"><i
                                                    class="bi bi-box-arrow-up-right"></i></a>
                                        </label>
                                        <div class="input-group">
                                            <input type="password" class="form-control" id="api_key" name="api_key"
                                                   required
                                                   data-i18n-placeholder="apiKeyPlaceholder"
                                                   placeholder="请输入您的API Key">
                                            <button class="btn btn-outline-secondary toggle-password" type="button"
                                                    data-target="api_key">
                                                <i class="bi bi-eye-slash"></i>
                                            </button>
                                        </div>
                                    </div>
                                    <div class="mb-3">
                                        <label for="model_id" class="form-label" data-i18n="modelIdLabel">模型
                                            ID</label>
                                        <input type="text" class="form-control" id="model_id" name="model_id" required
                                               data-i18n-placeholder="modelIdPlaceholder"
                                               placeholder="例如: gpt-4o, glm-4">
                                    </div>
                                </div>
                            </div>
                        </div>

                        <!-- Translation Settings -->
                        <div class="accordion-item">
                            <h2 class="accordion-header" id="headingThree">
                                <button class="accordion-button collapsed" type="button" data-bs-toggle="collapse"
                                        data-bs-target="#collapseThree" aria-expanded="false"
                                        aria-controls="collapseThree">
                                    <strong id="translationSettingsTitle"><i class="bi bi-translate me-2"></i>4. 翻译配置</strong>
                                </button>
                            </h2>
                            <div id="collapseThree" class="accordion-collapse collapse" aria-labelledby="headingThree">
                                <div class="accordion-body">
                                    <div class="mb-3">
                                        <label for="to_lang" class="form-label"
                                               data-i18n="targetLanguageLabel">目标语言</label>
                                        <select class="form-select" id="to_lang" name="to_lang">
                                            <option value="中文">中文(简体中文)</option>
                                            <option value="英文">英文(English)</option>
                                            <option value="西班牙文">西班牙文(Español)</option>
                                            <option value="法文">法文(Français)</option>
                                            <option value="德文">德文(Deutsch)</option>
                                            <option value="日文">日文(日本語)</option>
                                            <option value="韩文">韩文(한국어)</option>
                                            <option value="俄文">俄文(Русский)</option>
                                            <option value="葡萄牙文">葡萄牙文(Português)</option>
                                            <option value="阿拉伯文">阿拉伯文(العَرَبِيَّة)</option>
                                            <option value="越南文">越南文(tiếng Việt)</option>
                                            <option value="custom" data-i18n="targetLanguageCustom">其它 (自定义)
                                            </option>
                                        </select>
                                        <div class="mt-2" id="customLangGroup" style="display: none;">
                                            <input type="text" class="form-control" id="custom_to_lang"
                                                   name="custom_to_lang" data-i18n-placeholder="customLangPlaceholder"
                                                   placeholder="请输入目标语言, 例如: Italian">
                                        </div>
                                    </div>
                                    <div class="mb-3">
                                        <label class="form-label" data-i18n="thinkingModeLabel">思考模式</label><i
                                            class="bi bi-question-circle ms-2 tooltip-icon"
                                            data-bs-toggle="tooltip"
                                            data-bs-placement="top"
                                            data-i18n-title="thinkingModeTooltip"
                                            data-bs-title="设置混合推理模型的思考模式，目前支持智谱平台的glm-4.5系列、阿里云的qwen3系列、火山引擎的Doubao-Seed-1.6系列等">
                                    </i>
                                        <div id="thinkingModeBtnGroup" class="btn-group w-100" role="group"
                                             aria-label="Thinking Mode Toggle">
                                            <input type="radio" class="btn-check" name="thinking" id="thinkingEnable"
                                                   value="enable" autocomplete="off">
                                            <label class="btn btn-outline-primary" for="thinkingEnable"
                                                   data-i18n="thinkingModeEnable">启用</label>

                                            <input type="radio" class="btn-check" name="thinking" id="thinkingDisable"
                                                   value="disable" autocomplete="off">
                                            <label class="btn btn-outline-primary" for="thinkingDisable"
                                                   data-i18n="thinkingModeDisable">禁用</label>

                                            <input type="radio" class="btn-check" name="thinking" id="thinkingDefault"
                                                   value="default" autocomplete="off">
                                            <label class="btn btn-outline-primary" for="thinkingDefault"
                                                   data-i18n="thinkingModeDefault">默认</label>
                                        </div>
                                    </div>
                                    <div class="mb-3">
                                        <label for="custom_prompt" class="form-label" data-i18n="customPromptLabel">自定义Prompt</label>
                                        <textarea class="form-control" id="custom_prompt"
                                                  name="custom_prompt" rows="3"
                                                  data-i18n-placeholder="customPromptPlaceholder"
                                                  placeholder="可选，如“人名保持原文不翻译”"></textarea>
                                    </div>
                                </div>
                            </div>
                        </div>

                        <!-- Other Settings -->
                        <div class="accordion-item">
                            <h2 class="accordion-header" id="headingFour">
                                <button class="accordion-button collapsed" type="button" data-bs-toggle="collapse"
                                        data-bs-target="#collapseFour" aria-expanded="false"
                                        aria-controls="collapseFour">
                                    <strong id="advancedSettingsTitle"><i class="bi bi-sliders me-2"></i>5.
                                        高级参数</strong>
                                </button>
                            </h2>
                            <div id="collapseFour" class="accordion-collapse collapse" aria-labelledby="headingFour">
                                <div class="accordion-body">
                                    <div class="mb-3">
                                        <label for="chunk-size-slider"
                                               class="form-label d-flex justify-content-between">
                                            <span><span data-i18n="chunkSizeLabel">分块大小</span>: <span
                                                    id="chunk-size-display"></span></span>
                                            <button type="button"
                                                    class="btn btn-sm btn-outline-secondary py-0 px-1 slider-reset-btn"
                                                    id="chunk-size-reset" data-i18n="resetBtn">重置
                                            </button>
                                        </label>
                                        <input type="range" class="form-range" min="1000" max="8000" step="100"
                                               id="chunk-size-slider" name="chunk_size">
                                    </div>
                                    <div class="mb-3">
                                        <label for="concurrent-slider"
                                               class="form-label d-flex justify-content-between">
                                            <span><span data-i18n="concurrentLabel">并发数</span>: <span
                                                    id="concurrent-display"></span></span>
                                            <button type="button"
                                                    class="btn btn-sm btn-outline-secondary py-0 px-1 slider-reset-btn"
                                                    id="concurrent-reset" data-i18n="resetBtn">重置
                                            </button>
                                        </label>
                                        <input type="range" class="form-range" min="1" max="60" step="1"
                                               id="concurrent-slider" name="concurrent">
                                    </div>
                                    <div class="mb-3">
                                        <label for="temperature-slider"
                                               class="form-label d-flex justify-content-between">
                                            <span>Temperature: <span id="temperature-display"></span></span>
                                            <button type="button"
                                                    class="btn btn-sm btn-outline-secondary py-0 px-1 slider-reset-btn"
                                                    id="temperature-reset" data-i18n="resetBtn">重置
                                            </button>
                                        </label>
                                        <input type="range" class="form-range" min="0" max="2" step="0.1"
                                               id="temperature-slider" name="temperature">
                                    </div>
                                </div>
                            </div>
                        </div>
                    </div>
                </form>

                <!-- 项目信息 -->
                <div class="mt-4 text-left text-muted small">
                    <p class="bi bi-github mb-1" data-i18n="githubInfo">
                        GitHub主页(欢迎star❤): <br/>
                        <a href="https://github.com/xunbu/docutranslate" target="_blank" rel="noopener noreferrer">https://github.com/xunbu/docutranslate</a>
                    </p>
                    <p class="bi bi-tencent-qq mb-0" data-i18n="qqGroupInfo">
                        交流QQ群: 1047781902
                    </p>
                </div>

            </div>
        </div>

        <!-- Right: Task Area -->
        <div class="col-lg-8">
            <div class="task-area" id="task-area-container">
                <div class="d-flex justify-content-between align-items-center mb-3">
                    <h4 class="mb-0"><i class="bi bi-list-task me-2"></i><span data-i18n="taskListTitle">任务列表</span>
                    </h4>
                    <button class="btn btn-primary" id="addNewTaskBtn"><i class="bi bi-plus-circle-fill me-2"></i><span
                            data-i18n="newTaskBtn">新建任务</span>
                    </button>
                </div>
                <div id="task-container">
                    <!-- Task cards will be injected here -->
                </div>
                <div id="no-task-placeholder" class="text-center text-muted mt-5">
                    <i class="bi bi-journal-plus" style="font-size: 4rem;"></i>
                    <p class="mt-3" data-i18n="noTaskPlaceholder">当前没有任务，点击“新建任务”开始吧！</p>
                </div>
            </div>
        </div>
    </div>
</div>

<!-- Task Card Template -->
<template id="taskCardTemplate">
    <div class="card mb-3 task-card">
        <div class="card-header d-flex justify-content-between align-items-center">
            <span class="fw-bold"><span data-i18n="taskCardIdLabel">任务 ID</span>: <code class="task-id-display"><span
                    class="task-id-placeholder" data-i18n="taskCardIdPlaceholder">等待提交...</span></code></span>
            <button type="button" class="btn-close remove-task-btn" aria-label="Close"></button>
        </div>
        <div class="card-body">
            <div class="row">
                <div class="col-md-5">
                    <input type="file" class="d-none file-input">
                    <div class="file-drop-area">
                        <div class="file-drop-default">
                            <i class="bi bi-cloud-arrow-up fs-1"></i>
                            <p class="file-drop-prompt mb-0" data-i18n="taskCardFileDrop">点击或拖拽文件到此处</p>
                        </div>
                        <div class="file-drop-selected" style="display: none;">
                            <i class="bi bi-check-circle-fill fs-1 text-success"></i>
                            <p class="mb-0 mt-2 fw-bold text-success" data-i18n="taskCardFileSelected">文件已选择</p>
                        </div>
                    </div>
                    <div class="file-name-display-wrapper mt-2" style="display: none;">
                        <span class="fw-bold" data-i18n="taskCardFilenameLabel">文件名: </span>
                        <span class="file-name-display text-success"></span>
                    </div>
                </div>
                <div class="col-md-7">
                    <h6><i class="bi bi-terminal me-2"></i><span data-i18n="taskCardLogLabel">日志</span></h6>
                    <div class="log-area"></div>
                    <div class="mt-2">
                        <div class="status-message-container">
                            <span class="status-message small text-muted"
                                  data-i18n="taskCardStatusWaiting">等待上传文件...</span>
                        </div>
                        <div class="progress mt-1" role="progressbar" style="height: 5px; display: none;">
                            <div class="progress-bar progress-bar-striped progress-bar-animated"
                                 style="width: 100%"></div>
                        </div>
                    </div>
                </div>
            </div>
        </div>
        <div class="card-footer d-flex justify-content-between align-items-center">
            <div class="download-buttons" style="display: none;">
                <button class="btn btn-sm btn-success preview-html-btn" style="display: none;"><i
                        class="bi bi-eye-fill me-1"></i><span data-i18n="taskCardPreviewBtn">预览</span>
                </button>
                <div class="btn-group">
                    <button type="button" class="btn btn-sm btn-secondary dropdown-toggle" data-bs-toggle="dropdown"
                            aria-expanded="false">
                        <i class="bi bi-download me-1"></i><span data-i18n="taskCardDownloadBtn">下载</span>
                    </button>
                    <ul class="dropdown-menu download-menu-container">
                        <!-- Populated by JavaScript -->
                    </ul>
                </div>
            </div>
            <button class="btn btn-primary start-translate-btn ms-auto"><i class="bi bi-play-fill me-1"></i><span
                    data-i18n="taskCardStartBtn">开始翻译</span>
            </button>
        </div>
    </div>
</template>

<!-- Reusable Download Menu Template -->
<template id="downloadMenuTemplate">
    <li class="download-item-md"><a class="dropdown-item" href="#"><i
            class="bi bi-markdown-fill me-2"></i><span data-i18n="downloadMdEmbedded">Markdown(嵌图)</span></a></li>
    <li class="download-item-md-zip"><a class="dropdown-item" href="#"><i
            class="bi bi-file-zip-fill me-2"></i><span data-i18n="downloadMdZip">Markdown压缩包</span></a></li>
    <li class="download-item-txt"><a class="dropdown-item" href="#"><i
            class="bi bi-filetype-txt me-2"></i>TXT</a></li>
    <li class="download-item-json"><a class="dropdown-item" href="#"><i
            class="bi bi-filetype-json me-2"></i>JSON</a></li>
    <li class="download-item-docx"><a class="dropdown-item" href="#"><i
            class="bi bi-filetype-docx me-2"></i>DOCX</a></li>
    <li class="download-item-xlsx"><a class="dropdown-item" href="#"><i
            class="bi bi-filetype-xlsx me-2"></i>XLSX</a></li>
    <li class="download-item-srt"><a class="dropdown-item" href="#"><i
            class="bi bi-filetype-srt me-2"></i>SRT</a></li>
    <li class="download-item-epub"><a class="dropdown-item" href="#"><i
            class="bi bi-book me-2"></i>EPUB</a></li>
    <li class="download-item-html"><a class="dropdown-item" href="#"><i
            class="bi bi-filetype-html me-2"></i>HTML</a></li>
    <li class="download-item-pdf"><a class="dropdown-item" href="#"><i
            class="bi bi-file-earmark-pdf-fill me-2"></i>PDF</a></li>
</template>


<!-- Preview Offcanvas with Resizable Panes -->
<div class="offcanvas offcanvas-end" data-bs-scroll="true" tabindex="-1" id="previewOffcanvas"
     aria-labelledby="previewOffcanvasLabel">
    <div class="offcanvas-header border-bottom">
        <h5 class="offcanvas-title" id="previewOffcanvasLabel" data-i18n="previewTitle">预览</h5>
        <div class="btn-group me-auto ms-4" role="group">
            <button type="button" class="btn btn-sm btn-primary" id="setBilingualViewBtn"
                    data-i18n="previewBilingualBtn">双语
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            <button type="button" class="btn btn-sm btn-outline-primary" id="setTranslatedOnlyViewBtn"
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                </button>
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            <div class="modal-body" data-i18n="tutorialModalBody">
                <p><i class="bi bi-camera-video me-2"></i>视频教程可以在B站搜索 <a
                        href="https://search.bilibili.com/all?keyword=docutranslate" target="_blank">docutranslate</a>
                    获取。</p>
                <p>欢迎使用 DocuTranslate！请按照以下步骤完成文档翻译：</p>
                <ol>
                    <li>
                        <strong><i class="bi bi-diagram-3 me-2"></i>选择工作流</strong>
                        <p class="mt-2">
                            首先，在配置面板顶部选择您需要的翻译流程。不同的工作流适用于不同类型的文件：
                        <ul>
                            <li><b>转Markdown再翻译</b>: 适用于翻译PDF、markdown、图片等文件。</li>
                            <li><b>纯文本翻译</b>: 用于翻译 <code>.txt</code> 等纯文本文件。</li>
                            <li><b>JSON翻译</b>: 用于翻译 <code>.json</code> 文件中的特定字段。</li>
                            <li><b>DOCX翻译</b>: 用于翻译 <code>.docx</code> 文件。</li>
                            <li><b>XLSX翻译</b>: 用于翻译 <code>.xlsx</code> 电子表格文件。</li>
                            <li><b>SRT字幕翻译</b>: 用于翻译 <code>.srt</code> 字幕文件。</li>
                            <li><b>EPUB翻译</b>: 用于翻译 <code>.epub</code> 电子书文件。</li>
                            <li><b>HTML翻译</b>: 用于翻译 <code>.html</code> 文件。</li>
                        </ul>
                        <div class="alert alert-info mt-2" role="alert">
                            <i class="bi bi-lightbulb-fill me-2"></i>新增功能:
                            "自动选择工作流"开关已默认开启。您只需上传文件，系统会自动为您匹配合适的工作流，简化操作。
                        </div>
                        </p>
                    </li>
                    <li>
                        <strong><i class="bi bi-gear-fill me-2"></i>配置参数</strong>
                        <p class="mt-2">根据您选择的工作流，完成相应的配置。所有配置项都会自动保存在您的浏览器中。</p>
                        <ul>
                            <li class="mb-2"><strong>解析配置</strong> (仅在“转Markdown再翻译”工作流下显示):
                                <ul class="mt-1">
                                    <li><strong>解析引擎</strong>:
                                        选择一个引擎将您的文件（如PDF）转换为适合翻译的Markdown格式。如果您的文件已经是Markdown格式，则无需选择。
                                    </li>
                                    <li><strong>Mineru Token</strong>: 如果您选择 <code>minerU</code> 引擎，需要在此处填入您的Token。
                                    </li>
                                </ul>
                            </li>
                            <li class="mb-2"><strong>DOCX/XLSX/SRT/EPUB/HTML翻译选项</strong> (在对应工作流下显示):
                                <ul class="mt-1">
                                    <li><strong>插入模式</strong>:
                                        定义翻译结果如何放入文档或字幕。您可以选择直接“替换”原文，或是在原文之后“附加”，或是在原文之前“前置”。
                                    </li>
                                    <li><strong>分隔符</strong>: 当选择“附加”或“前置”模式时，此项用于在原文和译文之间插入分隔符。
                                    </li>
                                </ul>
                            </li>
                            <li class="mb-2"><strong>JSON路径配置</strong> (仅在“JSON翻译”工作流下显示):
                                <ul class="mt-1">
                                    <li><strong>需要翻译的JSON路径</strong>: 每行输入一个 <a
                                            href="https://goessner.net/articles/JsonPath/" target="_blank">JSONPath</a>
                                        表达式，指定需要翻译的字段。
                                    </li>
                                    <li>例如:<code>$..description</code>翻译所有键为description的值。<code>$.items[0].name</code>翻译第一个item的name值。
                                    </li>
                                </ul>
                            </li>
                            <li class="mb-2"><strong>翻译模型</strong>:
                                <ul class="mt-1">
                                    <li><strong>选择平台/API 地址/API Key/模型 ID</strong>:
                                        配置您希望使用的AI翻译服务。
                                    </li>
                                    <li>模型ID参考平台文档，建议使用非推理模型或混合推理模型（关闭思考）。</li>
                                </ul>
                            </li>
                            <li class="mb-2"><strong>翻译配置</strong>:
                                <ul class="mt-1">
                                    <li><strong>目标语言/自定义Prompt</strong>: 指定翻译的目标语言和附加指令。</li>
                                    <li><strong>思考模式</strong>:设置混合推理模型是否进行思考，目前支持智谱的glm4.5系列、阿里云的qwen3系列、火山引擎的seed1.6系列，建议选择禁用思考。
                                    </li>
                                </ul>
                            </li>
                            <li class="mb-2"><strong>高级参数</strong>:
                                <ul class="mt-1">
                                    <li><strong>分块大小/并发数/Temperature</strong>: 发给ai的分块大小、并发请求数和温度，通常保持默认即可。
                                    </li>
                                </ul>
                            </li>
                        </ul>
                    </li>
                    <li>
                        <strong><i class="bi bi-file-earmark-arrow-up-fill me-2"></i>上传文件</strong>
                        <p class="mt-2">在右侧的任务列表中，点击或拖拽您的文档到文件上传区域。</p>
                    </li>
                    <li>
                        <strong><i class="bi bi-play-circle-fill me-2"></i>开始翻译</strong>
                        <p class="mt-2">文件选择成功后，点击任务卡片右下角的 <span
                                class="badge bg-primary">开始翻译</span> 按钮。系统将开始处理任务，您可以在日志区域查看实时进度。
                        </p>
                    </li>
                    <li>
                        <strong><i class="bi bi-check-circle-fill me-2"></i>查看与下载</strong>
                        <p class="mt-2">翻译完成后，任务卡片下方会出现操作按钮：</p>
                        <ul>
                            <li><span class="badge bg-success"><i class="bi bi-eye-fill me-1"></i>预览</span>:
                                在右侧滑出的面板中进行原文和译文的对照预览（仅作参考）。
                            </li>
                            <li><span class="badge bg-secondary"><i class="bi bi-download me-1"></i>下载</span>:
                                下载包括 PDF, DOCX, XLSX, HTML, Markdown 等多种格式的译文。
                            </li>
                        </ul>
                    </li>
                </ol>
                <div class="alert alert-info mt-3" role="alert">
                    <i class="bi bi-info-circle-fill me-2"></i><strong>提示</strong>: 所有配置都会自动保存在您的浏览器本地，方便下次使用。
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                    <p data-i18n="contributorsWelcome">欢迎通过以下方式参与贡献：</p>
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                        <a href="https://github.com/xunbu/docutranslate" target="_blank"
                           class="btn btn-info btn-sm ms-2">
                            <i class="bi bi-github me-1"></i><span data-i18n="contributorsGithub">github 主页</span>
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                            <i class="bi bi-git me-1"></i><span data-i18n="contributorsPR">提交 Pull Request</span>
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                resolve(base64String);
            };
            reader.onerror = error => reject(error);
        });
    }

    // --- UI Update Functions based on Workflow ---
    function updateWorkflowUI() {
        const selectedWorkflow = workflowTypeSelect.value;
        const translations = i18nData[currentLang] || i18nData.zh;

        // Hide all workflow-specific containers first
        parsingSettingsContainer.style.display = 'none';
        jsonSettingsContainer.style.display = 'none';
        xlsxSettingsContainer.style.display = 'none';
        docxSettingsContainer.style.display = 'none';
        srtSettingsContainer.style.display = 'none';
        epubSettingsContainer.style.display = 'none';
        htmlSettingsContainer.style.display = 'none';

        // Default numbering
        let currentStep = 2;
        const getStep = () => currentStep++;

        // Update main workflow title (it's static)
        document.querySelector('#headingZero button strong').innerHTML = `<i class="bi bi-diagram-3 me-2"></i>${translations.workflowTitle}`;

        switch (selectedWorkflow) {
            case 'markdown_based':
                parsingSettingsContainer.style.display = 'block';
                parsingSettingsTitle.innerHTML = `<i class="bi bi-file-earmark-binary me-2"></i>${getStep()}. ${translations.parsingSettingsTitleText}`;
                break;
            case 'txt':
                // No specific panel, just re-number
                break;
            case 'json':
                jsonSettingsContainer.style.display = 'block';
                jsonSettingsTitle.innerHTML = `<i class="bi bi-signpost-split me-2"></i>${getStep()}. ${translations.jsonSettingsTitleText}`;
                break;
            case 'xlsx':
                xlsxSettingsContainer.style.display = 'block';
                xlsxSettingsTitle.innerHTML = `<i class="bi bi-file-earmark-spreadsheet me-2"></i>${getStep()}. ${translations.xlsxSettingsTitleText}`;
                updateSeparatorVisibility(xlsxInsertModeSelect, xlsxSeparatorGroup);
                break;
            case 'docx':
                docxSettingsContainer.style.display = 'block';
                docxSettingsTitle.innerHTML = `<i class="bi bi-file-earmark-word me-2"></i>${getStep()}. ${translations.docxSettingsTitleText}`;
                updateSeparatorVisibility(docxInsertModeSelect, docxSeparatorGroup);
                break;
            case 'srt':
                srtSettingsContainer.style.display = 'block';
                srtSettingsTitle.innerHTML = `<i class="bi bi-file-text me-2"></i>${getStep()}. ${translations.srtSettingsTitleText}`;
                updateSeparatorVisibility(srtInsertModeSelect, srtSeparatorGroup);
                break;
            case 'epub':
                epubSettingsContainer.style.display = 'block';
                epubSettingsTitle.innerHTML = `<i class="bi bi-book me-2"></i>${getStep()}. ${translations.epubSettingsTitleText}`;
                updateSeparatorVisibility(epubInsertModeSelect, epubSeparatorGroup);
                break;
            case 'html':
                htmlSettingsContainer.style.display = 'block';
                htmlSettingsTitle.innerHTML = `<i class="bi bi-filetype-html me-2"></i>${getStep()}. ${translations.htmlSettingsTitleText}`;
                updateSeparatorVisibility(htmlInsertModeSelect, htmlSeparatorGroup);
                break;
        }

        // Renumber common sections
        aiSettingsTitle.innerHTML = `<i class="bi bi-robot me-2"></i>${getStep()}. ${translations.aiSettingsTitleText}`;
        translationSettingsTitle.innerHTML = `<i class="bi bi-translate me-2"></i>${getStep()}. ${translations.translationSettingsTitleText}`;
        advancedSettingsTitle.innerHTML = `<i class="bi bi-sliders me-2"></i>${getStep()}. ${translations.advancedSettingsTitleText}`;

        saveToStorage('translator_last_workflow', selectedWorkflow);
    }

    function updateSeparatorVisibility(modeSelect, separatorGroup) {
        const selectedMode = modeSelect.value;
        if (selectedMode === 'append' || selectedMode === 'prepend') {
            separatorGroup.style.display = 'block';
        } else {
            separatorGroup.style.display = 'none';
        }
    }

    function updateCustomLangUI() {
        const isCustom = toLangSelect.value === 'custom';
        customLangGroup.style.display = isCustom ? 'block' : 'none';
        customLangInput.required = isCustom;
    }

    // --- Other UI Update Functions ---
    function updatePlatformUI() {
        const selectedPlatformValue = platformSelect.value;
        apikeyInput.value = getFromStorage(`translator_platform_${selectedPlatformValue}_apikey`);
        modelInput.value = getFromStorage(`translator_platform_${selectedPlatformValue}_model_id`);
        if (selectedPlatformValue === 'custom') {
            baseUrlGroup.classList.remove('d-none');
            baseUrlInput.required = true;
            baseUrlInput.value = getFromStorage('translator_platform_custom_base_url');
            apiHref.classList.add('d-none');
        } else {
            baseUrlGroup.classList.add('d-none');
            baseUrlInput.required = false;
            baseUrlInput.value = selectedPlatformValue;
            if (apiHrefMap[baseUrlInput.value]) {
                apiHref.href = apiHrefMap[baseUrlInput.value];
                apiHref.classList.remove('d-none');
            } else {
                apiHref.classList.add('d-none');
            }
        }
        saveToStorage('translator_last_platform', selectedPlatformValue);
    }

    function updateConvertEnginUI(isLanguageChange = false) {
        if (!isLanguageChange) {
            const selectedEngin = convertEnginSelect.value;
            mineruTokenGroup.style.display = selectedEngin === 'mineru' ? 'block' : 'none';
            mineruTokenInput.required = selectedEngin === 'mineru';
            codeOcrSwitch.style.display = selectedEngin === 'docling' ? 'block' : 'none';

            if (selectedEngin === 'mineru') {
                mineruTokenInput.value = getFromStorage('translator_mineru_token');
            }
            saveToStorage('translator_convert_engin', selectedEngin);
        } else {
            // Repopulate options with translated text
            const savedValue = convertEnginSelect.value;
            const enginOptions = convertEnginSelect.querySelectorAll('option');
            enginOptions.forEach(option => {
                let textKey;
                switch (option.value) {
                    case 'identity':
                        textKey = 'engineOptionIdentity';
                        break;
                    case 'mineru':
                        textKey = 'engineOptionMineru';
                        break;
                    case 'docling':
                        textKey = 'engineOptionDocling';
                        break;
                    default:
                        textKey = option.value;
                }
                option.textContent = getText(textKey, option.value);
            });
            convertEnginSelect.value = savedValue;
        }
    }

    function createSliderUpdater(slider, display, resetBtn, key, params) {
        return () => {
            const value = slider.value;
            display.textContent = value;
            resetBtn.style.visibility = value !== String(params[key]) ? 'visible' : 'hidden';
            saveToStorage(key, value);
        };
    }

    function setupSlider(slider, display, resetBtn, key, params) {
        slider.value = getFromStorage(key, params[key]);
        const updater = createSliderUpdater(slider, display, resetBtn, key, params);
        slider.addEventListener('input', updater);
        resetBtn.addEventListener('click', () => {
            slider.value = params[key];
            updater();
        });
        updater(); // Initial call
    }

    function updateTaskPlaceholderVisibility() {
        noTaskPlaceholder.style.display = Object.keys(tasks).length === 0 ? 'block' : 'none';
    }

    function saveTaskIds() {
        if (isAdminMode) return;
        const submittedTaskIds = Object.values(tasks)
            .map(task => task.state.backendTaskId)
            .filter(id => id);
        saveToStorage('active_task_ids', JSON.stringify(submittedTaskIds));
    }

    // --- Task Card Management ---
    function createTaskCard(backendTaskId = null, restoreState = false) {
        const cardId = backendTaskId || generateCardId();
        if (tasks[cardId]) return; // Avoid duplicate cards

        const cardFragment = taskCardTemplate.content.cloneNode(true);
        const cardElement = cardFragment.querySelector('.task-card');
        cardElement.dataset.cardId = cardId;

        // Translate the new card immediately
        const translations = i18nData[currentLang] || i18nData.zh;
        cardElement.querySelectorAll('[data-i18n]').forEach(el => el.innerHTML = translations[el.dataset.i18n] || el.innerHTML);
        cardElement.querySelectorAll('[data-i18n-placeholder]').forEach(el => el.placeholder = translations[el.dataset.i18nPlaceholder] || el.placeholder);


        const elements = {
            card: cardElement,
            taskIdDisplay: cardElement.querySelector('.task-id-display'),
            removeBtn: cardElement.querySelector('.remove-task-btn'),
            fileInput: cardElement.querySelector('.file-input'),
            fileDropArea: cardElement.querySelector('.file-drop-area'),
            fileDropDefault: cardElement.querySelector('.file-drop-default'),
            fileDropSelected: cardElement.querySelector('.file-drop-selected'),
            fileNameDisplayWrapper: cardElement.querySelector('.file-name-display-wrapper'),
            fileNameDisplay: cardElement.querySelector('.file-name-display'),
            logArea: cardElement.querySelector('.log-area'),
            statusMessage: cardElement.querySelector('.status-message'),
            progress: cardElement.querySelector('.progress'),
            downloadButtons: cardElement.querySelector('.download-buttons'),
            downloadMenuContainer: cardElement.querySelector('.download-menu-container'),
            previewBtn: cardElement.querySelector('.preview-html-btn'),
            startBtn: cardElement.querySelector('.start-translate-btn'),
        };

        if (restoreState && backendTaskId) {
            elements.taskIdDisplay.innerHTML = `<code>${backendTaskId}</code>`;
        }

        tasks[cardId] = {
            elements,
            state: {
                backendTaskId: backendTaskId,
                isTranslating: false,
                file: null,
                htmlUrl: null,
                fileNameStem: null,
                isSubmitted: restoreState,
                downloads: {},
                workflow: null
            },
            intervals: {
                log: null,
                status: null
            }
        };

        addEventListenersToCard(cardId);

        taskContainer.prepend(cardElement);
        updateTaskPlaceholderVisibility();

        if (restoreState && backendTaskId) {
            pollStatus(backendTaskId, true);
        }
    }

    async function releaseTask(backendTaskId) {
        try {
            await fetch(`/service/release/${backendTaskId}`, {method: 'POST'});
            console.log(`[${backendTaskId}] Release request sent to backend.`);
        } catch (error) {
            console.error(`[${backendTaskId}] Failed to send release request:`, error);
        }
    }

    async function removeTask(cardId) {
        const task = tasks[cardId];
        if (!task) return;

        const backendTaskId = task.state.backendTaskId;
        if (backendTaskId) {
            stopPolling(backendTaskId);
            await releaseTask(backendTaskId);
        }

        task.elements.card.remove();
        delete tasks[cardId];

        saveTaskIds();
        updateTaskPlaceholderVisibility();
    }

    function addEventListenersToCard(cardId) {
        const {elements} = tasks[cardId];

        elements.card.addEventListener('click', () => {
            const task = tasks[cardId];
            if (task && task.state.workflow) {
                workflowTypeSelect.value = task.state.workflow;
                updateWorkflowUI();
            }
        });

        elements.removeBtn.addEventListener('click', () => removeTask(cardId));

        elements.fileDropArea.addEventListener('click', () => elements.fileInput.click());
        elements.fileInput.addEventListener('change', () => handleFileSelect(cardId));
        ['dragenter', 'dragover', 'dragleave', 'drop'].forEach(eventName => {
            elements.fileDropArea.addEventListener(eventName, e => {
                e.preventDefault();
                e.stopPropagation();
            }, false);
        });
        ['dragenter', 'dragover'].forEach(eventName => {
            elements.fileDropArea.addEventListener(eventName, () => elements.fileDropArea.classList.add('drag-over'), false);
        });
        ['dragleave', 'drop'].forEach(eventName => {
            elements.fileDropArea.addEventListener(eventName, () => elements.fileDropArea.classList.remove('drag-over'), false);
        });
        elements.fileDropArea.addEventListener('drop', e => {
            if (e.dataTransfer.files.length > 0) {
                elements.fileInput.files = e.dataTransfer.files;
                handleFileSelect(cardId);
            }
        }, false);

        elements.startBtn.addEventListener('click', () => {
            if (tasks[cardId].state.isTranslating) {
                cancelTranslation(cardId);
            } else {
                startTranslation(cardId);
            }
        });
    }

    function handleFileSelect(cardId) {
        const {elements, state} = tasks[cardId];
        const file = elements.fileInput.files[0];
        if (file) {
            state.file = file;
            elements.fileNameDisplay.textContent = file.name;
            elements.fileNameDisplayWrapper.style.display = 'block';
            elements.fileDropArea.classList.add('file-selected');
            elements.fileDropDefault.style.display = 'none';
            elements.fileDropSelected.style.display = 'block';
            elements.fileDropArea.classList.remove('input-error');
            elements.fileNameDisplay.classList.remove('input-error-text');

            if (autoWorkflowSwitch.checked) {
                const fileExtension = file.name.split('.').pop().toLowerCase();
                const targetWorkflow = workflowExtensionMap[fileExtension] || defaultAutoWorkflow;
                workflowTypeSelect.value = targetWorkflow;
                updateWorkflowUI();
            }
        }
    }

    // --- Core Translation Logic ---
    async function startTranslation(cardId) {
        const {elements, state} = tasks[cardId];

        // --- File and common settings validation ---
        if (!state.file) {
            elements.statusMessage.textContent = getText('status_selectFileFirst');
            elements.statusMessage.className = 'status-message small text-danger';
            elements.fileDropArea.classList.add('input-error');
            return;
        }
        const requiredCommonInputs = [apikeyInput, modelInput];
        if (platformSelect.value === 'custom') requiredCommonInputs.push(baseUrlInput);

        let isValid = true;
        requiredCommonInputs.forEach(input => {
            input.classList.remove('is-invalid');
            if (!input.value.trim()) {
                input.classList.add('is-invalid');
                isValid = false;
            }
        });

        if (toLangSelect.value === 'custom') {
            customLangInput.classList.remove('is-invalid');
            if (!customLangInput.value.trim()) {
                customLangInput.classList.add('is-invalid');
                isValid = false;
            }
        }

        // --- Workflow-specific validation and payload building ---
        const workflowType = workflowTypeSelect.value;
        state.workflow = workflowType;
        let workflowPayload = {};

        let targetLanguage = toLangSelect.value;
        if (targetLanguage === 'custom') {
            targetLanguage = customLangInput.value.trim();
        }

        const basePayload = {
            base_url: baseUrlInput.value,
            api_key: apikeyInput.value,
            model_id: modelInput.value,
            to_lang: targetLanguage,
            thinking: document.querySelector('input[name="thinking"]:checked')?.value || 'disable',
            chunk_size: parseInt(chunkSizeSlider.value, 10),
            concurrent: parseInt(concurrentSlider.value, 10),
            temperature: parseFloat(temperatureSlider.value),
            custom_prompt: customPromptTranslateArea.value || null,
        };

        switch (workflowType) {
            case 'markdown_based':
                if (convertEnginSelect.value === 'mineru' && !mineruTokenInput.value.trim()) {
                    mineruTokenInput.classList.add('is-invalid');
                    isValid = false;
                } else {
                    mineruTokenInput.classList.remove('is-invalid');
                }
                workflowPayload = {
                    ...basePayload,
                    workflow_type: 'markdown_based',
                    convert_engine: convertEnginSelect.value || null,
                    mineru_token: mineruTokenInput.value || null,
                    formula_ocr: formulaCheckbox.checked,
                    code_ocr: codeCheckbox.checked,
                };
                break;
            case 'txt':
                workflowPayload = {
                    ...basePayload,
                    workflow_type: 'txt'
                };
                break;
            case 'json':
                const jsonPaths = jsonPathsTextarea.value.trim().split('\n').map(p => p.trim()).filter(p => p);
                if (jsonPaths.length === 0) {
                    jsonPathsTextarea.classList.add('is-invalid');
                    isValid = false;
                } else {
                    jsonPathsTextarea.classList.remove('is-invalid');
                }
                workflowPayload = {
                    ...basePayload,
                    workflow_type: 'json',
                    json_paths: jsonPaths,
                };
                break;
            case 'xlsx':
                workflowPayload = {
                    ...basePayload,
                    workflow_type: 'xlsx',
                    insert_mode: xlsxInsertModeSelect.value,
                    separator: xlsxSeparatorInput.value.replace(/\\n/g, '\n')
                };
                break;
            case 'docx':
                workflowPayload = {
                    ...basePayload,
                    workflow_type: 'docx',
                    insert_mode: docxInsertModeSelect.value,
                    separator: docxSeparatorInput.value.replace(/\\n/g, '\n')
                };
                break;
            case 'srt':
                workflowPayload = {
                    ...basePayload,
                    workflow_type: 'srt',
                    insert_mode: srtInsertModeSelect.value,
                    separator: srtSeparatorInput.value.replace(/\\n/g, '\n')
                };
                break;
            case 'epub':
                workflowPayload = {
                    ...basePayload,
                    workflow_type: 'epub',
                    insert_mode: epubInsertModeSelect.value,
                    separator: epubSeparatorInput.value.replace(/\\n/g, '\n')
                };
                break;
            case 'html':
                workflowPayload = {
                    ...basePayload,
                    workflow_type: 'html',
                    insert_mode: htmlInsertModeSelect.value,
                    separator: htmlSeparatorInput.value.replace(/\\n/g, '\n')
                };
                break;
            default:
                elements.statusMessage.textContent = getText('status_invalidWorkflow');
                elements.statusMessage.className = 'status-message small text-danger';
                return;
        }

        if (!isValid) {
            elements.statusMessage.textContent = getText('status_fillRequired');
            elements.statusMessage.className = 'status-message small text-danger';
            return;
        }

        // --- Release old task and start new one ---
        const oldBackendTaskId = state.backendTaskId;
        if (oldBackendTaskId) {
            console.log(`[${oldBackendTaskId}] ${getText('status_releasingOldTask')}`);
            await releaseTask(oldBackendTaskId);
            state.backendTaskId = null;
        }

        state.isTranslating = true;
        elements.startBtn.disabled = true;
        elements.startBtn.innerHTML = `<span class="spinner-border spinner-border-sm" role="status" aria-hidden="true"></span> <span data-i18n="btn_initializing">${getText('btn_initializing')}</span>`;
        elements.logArea.innerHTML = '';
        elements.statusMessage.textContent = getText('status_encodingAndSubmitting');
        elements.statusMessage.className = 'status-message small text-muted';
        elements.downloadButtons.style.display = 'none';
        elements.progress.style.display = 'block';

        try {
            const fileContentBase64 = await fileToBase64(state.file);
            const finalRequest = {
                file_name: state.file.name,
                file_content: fileContentBase64,
                payload: workflowPayload
            };

            const response = await fetch('/service/translate', {
                method: 'POST',
                headers: {'Content-Type': 'application/json'},
                body: JSON.stringify(finalRequest)
            });
            const result = await response.json();

            if (response.ok && result.task_started) {
                const backendTaskId = result.task_id;
                state.backendTaskId = backendTaskId;
                state.isSubmitted = true;
                elements.taskIdDisplay.innerHTML = `<code>${backendTaskId}</code>`;
                elements.taskIdDisplay.classList.remove('task-id-placeholder');

                saveTaskIds();

                elements.statusMessage.textContent = result.message || getText('status_requestOk');
                elements.statusMessage.className = 'status-message small text-info';
                elements.startBtn.innerHTML = `<i class="bi bi-stop-circle-fill me-1"></i><span data-i18n="btn_cancelTranslation">${getText('btn_cancelTranslation')}</span>`;
                elements.startBtn.classList.replace('btn-primary', 'btn-danger');
                elements.startBtn.disabled = false;

                startPolling(backendTaskId);
            } else {
                let errorMessage = result.detail || result.message || `${getText('status_requestFail')} (${response.status})`;
                if (typeof errorMessage === 'object') {
                    errorMessage = JSON.stringify(errorMessage);
                }
                throw new Error(errorMessage);
            }
        } catch (error) {
            state.isSubmitted = false;
            console.error('Request failed:', error);
            elements.statusMessage.textContent = `${getText('status_initFail')}: ${error.message}`;
            elements.statusMessage.className = 'status-message small text-danger';
            elements.startBtn.innerHTML = `<i class="bi bi-play-fill me-1"></i><span data-i18n="taskCardStartBtn">${getText('taskCardStartBtn')}</span>`;
            elements.startBtn.classList.replace('btn-danger', 'btn-primary');
            elements.startBtn.disabled = false;
            elements.progress.style.display = 'none';
            state.isTranslating = false;
        }
    }

    async function cancelTranslation(cardId) {
        const task = tasks[cardId];
        if (!task || !task.state.backendTaskId) return;

        const {elements} = task;
        const backendTaskId = task.state.backendTaskId;

        elements.startBtn.disabled = true;
        elements.startBtn.innerHTML = `<span class="spinner-border spinner-border-sm" role="status" aria-hidden="true"></span> <span data-i18n="status_cancelling">${getText('status_cancelling')}</span>`;

        try {
            const response = await fetch(`/service/cancel/${backendTaskId}`, {method: 'POST'});
            const result = await response.json();

            if (response.ok && result.cancelled) {
                elements.statusMessage.textContent = result.message || getText('status_cancelSent');
                elements.statusMessage.className = 'status-message small text-warning';
            } else {
                throw new Error(result.message || getText('status_cancelFail'));
            }
        } catch (error) {
            elements.statusMessage.textContent = `${getText('status_cancelFail')}: ${error.message}`;
            elements.statusMessage.className = 'status-message small text-danger';
            elements.startBtn.disabled = false;
            elements.startBtn.innerHTML = `<i class="bi bi-stop-circle-fill me-1"></i><span data-i18n="btn_cancelTranslation">${getText('btn_cancelTranslation')}</span>`;
        }
    }

    // --- Polling ---
    function startPolling(backendTaskId) {
        stopPolling(backendTaskId);
        const card = Object.values(tasks).find(t => t.state.backendTaskId === backendTaskId);
        if (!card) return;

        card.intervals.log = setInterval(() => pollLogs(backendTaskId), 2000);
        card.intervals.status = setInterval(() => pollStatus(backendTaskId), 1500);
        pollLogs(backendTaskId);
        pollStatus(backendTaskId);
    }

    function stopPolling(backendTaskId) {
        const card = Object.values(tasks).find(t => t.state.backendTaskId === backendTaskId);
        if (!card) return;

        const {intervals} = card;
        if (intervals.log) clearInterval(intervals.log);
        if (intervals.status) clearInterval(intervals.status);
        intervals.log = null;
        intervals.status = null;
    }

    async function pollLogs(backendTaskId) {
        const card = Object.values(tasks).find(t => t.state.backendTaskId === backendTaskId);
        if (!card) return;
        const {elements} = card;

        try {
            const response = await fetch(`/service/logs/${backendTaskId}`);
            if (!response.ok) return;
            const data = await response.json();
            if (data.logs && data.logs.length > 0) {
                elements.logArea.innerHTML += data.logs.map(log => log.replace(/</g, "<").replace(/>/g, ">") + '<br>').join('');
                elements.logArea.scrollTop = elements.logArea.scrollHeight;
            }
        } catch (error) {
            console.warn(`[${backendTaskId}] Error polling logs:`, error);
        }
    }

    async function pollStatus(backendTaskId, isRestore = false) {
        const card = Object.values(tasks).find(t => t.state.backendTaskId === backendTaskId);
        if (!card) {
            if (isRestore) {
                console.warn(`Restored task ${backendTaskId} not found in UI, removing from storage.`);
                const savedTaskIds = JSON.parse(getFromStorage('active_task_ids', '[]'));
                const newIds = savedTaskIds.filter(id => id !== backendTaskId);
                saveToStorage('active_task_ids', JSON.stringify(newIds));
            }
            return;
        }
        const {elements, state} = card;
        const cardId = elements.card.dataset.cardId;

        try {
            const response = await fetch(`/service/status/${backendTaskId}`);
            if (!response.ok) {
                if (response.status === 404 && isRestore) {
                    console.warn(`Task ${backendTaskId} not found on server (404). Removing from UI.`);
                    await removeTask(cardId);
                }
                return;
            }
            const status = await response.json();

            if (status.original_filename && (!state.file || isRestore)) {
                elements.fileNameDisplay.textContent = status.original_filename;
                elements.fileNameDisplayWrapper.style.display = 'block';
            }

            elements.statusMessage.textContent = status.status_message || getText('status_gettingStatus');
            elements.statusMessage.className = `status-message small ${status.error_flag ? 'text-danger' : 'text-info'}`;

            if (!status.is_processing) {
                pollLogs(backendTaskId); // Get final logs
                stopPolling(backendTaskId);
                state.isTranslating = false;
                elements.startBtn.disabled = false;
                elements.startBtn.innerHTML = `<i class="bi bi-arrow-clockwise me-1"></i><span data-i18n="btn_reTranslate">${getText('btn_reTranslate')}</span>`;
                elements.startBtn.classList.replace('btn-danger', 'btn-primary');
                elements.progress.style.display = 'none';

                if (status.download_ready && !status.error_flag) {
                    elements.statusMessage.className = 'status-message small text-success';
                    updateDownloadButtons(cardId, status);
                } else {
                    elements.downloadButtons.style.display = 'none';
                }
            } else {
                state.isTranslating = true;
                elements.startBtn.innerHTML = `<i class="bi bi-stop-circle-fill me-1"></i><span data-i18n="btn_cancelTranslation">${getText('btn_cancelTranslation')}</span>`;
                elements.startBtn.classList.replace('btn-primary', 'btn-danger');
                elements.startBtn.disabled = false;
                elements.progress.style.display = 'block';
                elements.downloadButtons.style.display = 'none';

                if (isRestore && !card.intervals.status) {
                    startPolling(backendTaskId);
                }
            }

        } catch (error) {
            console.error(`[${backendTaskId}] Error polling status:`, error);
            elements.statusMessage.textContent = getText('status_updateError');
            elements.statusMessage.className = 'status-message small text-danger';
        }
    }

    // --- Download and Preview ---
    function populateDownloadMenu(menuElement, downloads, cardId) {
        menuElement.innerHTML = ''; // Clear existing items
        if (!downloadMenuTemplate) return false;

        const content = downloadMenuTemplate.content.cloneNode(true);
        // Translate the template before using
        content.querySelectorAll('[data-i18n]').forEach(el => el.innerHTML = getText(el.dataset.i18n));
        let anyLinkAdded = false;

        const setupLink = (selector, key) => {
            const li = content.querySelector(selector);
            if (li && downloads[key]) {
                li.querySelector('a').href = downloads[key];
                menuElement.appendChild(li);
                anyLinkAdded = true;
            }
        };

        setupLink('.download-item-md', 'markdown');
        setupLink('.download-item-md-zip', 'markdown_zip');
        setupLink('.download-item-txt', 'txt');
        setupLink('.download-item-json', 'json');
        setupLink('.download-item-docx', 'docx');
        setupLink('.download-item-xlsx', 'xlsx');
        setupLink('.download-item-srt', 'srt');
        setupLink('.download-item-epub', 'epub');
        setupLink('.download-item-html', 'html');

        // Special handler for PDF, which is generated on the fly
        const pdfLi = content.querySelector('.download-item-pdf');
        if (pdfLi && downloads.html) {
            const pdfLink = pdfLi.querySelector('a');
            pdfLink.href = '#';
            pdfLink.onclick = (e) => {
                e.preventDefault();
                downloadPdf(cardId);
            };
            menuElement.appendChild(pdfLi);
            anyLinkAdded = true;
        }

        return anyLinkAdded;
    }


    function updateDownloadButtons(cardId, status) {
        const {elements, state} = tasks[cardId];
        const {downloads} = status;
        state.downloads = downloads; // Store for preview

        const {previewBtn, downloadButtons, downloadMenuContainer} = elements;

        // Reset visibility
        previewBtn.style.display = 'none';
        downloadButtons.style.display = 'none';

        if (downloads.html) {
            state.htmlUrl = downloads.html;
            state.fileNameStem = status.original_filename_stem;
            previewBtn.style.display = 'inline-block';
            previewBtn.onclick = () => setupPreview(cardId);
        }

        const anyDownloadAvailable = populateDownloadMenu(downloadMenuContainer, downloads, cardId);

        if (anyDownloadAvailable || downloads.html) {
            downloadButtons.style.display = 'flex';
        }
    }

    function setupPreview(cardId) {
        const {state} = tasks[cardId];
        if (!state.htmlUrl) return;

        const existingOriginalContent = originalPreviewPane.querySelector('iframe, pre, p');
        if (existingOriginalContent) existingOriginalContent.remove();
        translatedPreviewFrame.src = 'about:blank';
        translatedPreviewFrame.srcdoc = getText('preview_loading');

        setPreviewDisplayMode('bilingual');
        previewOffcanvas.show();

        const menu = document.getElementById('previewDownloadMenu');
        populateDownloadMenu(menu, state.downloads, cardId);


        if (state.file) {
            const fileType = state.file.type;
            const fileExtension = state.file.name.split('.').pop().toLowerCase();
            const textLikeExtensions = ['md', 'json', 'xml', 'log', 'py', 'js', 'css', 'java', 'c', 'cpp', 'h', 'hpp', 'cs', 'rb', 'php', 'swift', 'kt', 'go', 'rs', 'ts', 'txt', 'srt'];

            if (fileType.startsWith('text/') || textLikeExtensions.includes(fileExtension)) {
                const pre = document.createElement('pre');
                state.file.text()
                    .then(text => pre.textContent = text)
                    .catch(() => pre.textContent = getText('preview_cantReadOriginal'));
                originalPreviewPane.appendChild(pre);
            } else if (['application/pdf', 'text/html'].includes(fileType) || ['html', 'htm'].includes(fileExtension)) {
                const iframe = document.createElement('iframe');
                iframe.src = URL.createObjectURL(state.file);
                originalPreviewPane.appendChild(iframe);
            } else {
                const p = document.createElement('p');
                p.className = 'p-3 text-muted';
                p.textContent = `${getText('preview_cantPreviewType')} (${fileType || 'unknown: ' + fileExtension}).`;
                originalPreviewPane.appendChild(p);
            }
        } else {
            const p = document.createElement('p');
            p.className = 'p-3 text-muted';
            p.textContent = getText('preview_noOriginalCache');
            originalPreviewPane.appendChild(p);
        }

        fetch(state.htmlUrl)
            .then(resp => resp.ok ? resp.text() : Promise.reject(`HTTP error ${resp.status}`))
            .then(html => {
                translatedPreviewFrame.srcdoc = html;
            })
            .catch(err => {
                console.error('Preview fetch failed:', err);
                translatedPreviewFrame.srcdoc = `${getText('preview_loadFailed')}<p>${err.message}</p>`;
            });
    }

    function downloadPdf(cardId) {
        const {elements, state} = tasks[cardId];
        if (!state.htmlUrl) return;

        const toast = new bootstrap.Toast(document.createElement('div'), {
            autohide: true,
            delay: 3000
        });
        toast._element.classList.add('toast', 'position-fixed', 'top-0', 'end-0', 'p-3', 'bg-info', 'text-white');
        toast._element.innerHTML = `<div class="toast-body">${getText('pdf_preparing')}</div>`;
        document.body.appendChild(toast._element);
        toast.show();

        fetch(state.htmlUrl)
            .then(resp => resp.ok ? resp.text() : Promise.reject(`HTTP error ${resp.status}`))
            .then(html => {
                printFrameEl.onload = () => {
                    setTimeout(() => {
                        try {
                            printFrameEl.contentWindow.focus();
                            printFrameEl.contentWindow.print();
                        } catch (err) {
                            alert(getText('pdf_print_failed'));
                        } finally {
                            printFrameEl.onload = null;
                            printFrameEl.srcdoc = ''; // Clear content
                        }
                    }, 500);
                };
                printFrameEl.srcdoc = html;
            })
            .catch(err => {
                alert(getText('pdf_fetch_failed'));
            });
    }

    function setPreviewDisplayMode(mode) {
        if (previewSplitInstance) {
            previewSplitInstance.destroy();
            previewSplitInstance = null;
        }

        const isMobileView = window.innerWidth < 992;
        const splitContainer = document.querySelector('.preview-split-container');
        originalPreviewContainer.style.display = 'flex';
        translatedPreviewContainer.style.display = 'flex';
        [originalPreviewContainer, translatedPreviewContainer].forEach(el => {
            el.style.width = '';
            el.style.height = '';
        });
        splitContainer.style.flexDirection = isMobileView ? 'column' : 'row';

        if (mode === 'bilingual') {
            previewOffcanvasLabel.textContent = getText('preview_bilingual');

            if (isMobileView) {
                previewSplitInstance = Split(['#originalPreviewContainer', '#translatedPreviewContainer'], {
                    direction: 'vertical', sizes: [50, 50], minSize: 150, gutterSize: 10, cursor: 'row-resize',
                });
            } else {
                previewSplitInstance = Split(['#originalPreviewContainer', '#translatedPreviewContainer'], {
                    direction: 'horizontal', sizes: [50, 50], minSize: 200, gutterSize: 10, cursor: 'col-resize',
                });
            }

            setBilingualViewBtn.classList.add('btn-primary');
            setBilingualViewBtn.classList.remove('btn-outline-primary');
            setTranslatedOnlyViewBtn.classList.remove('btn-primary');
            setTranslatedOnlyViewBtn.classList.add('btn-outline-primary');

        } else { // mode === 'translatedOnly'
            previewOffcanvasLabel.textContent = getText('preview_translatedOnly');
            originalPreviewContainer.style.display = 'none';

            if (isMobileView) {
                translatedPreviewContainer.style.height = '100%';
            } else {
                translatedPreviewContainer.style.width = '100%';
            }

            setTranslatedOnlyViewBtn.classList.add('btn-primary');
            setTranslatedOnlyViewBtn.classList.remove('btn-outline-primary');
            setBilingualViewBtn.classList.remove('btn-primary');
            setBilingualViewBtn.classList.add('btn-outline-primary');
        }
    }

    // --- Password Toggle Functionality ---
    function setupPasswordToggle(button) {
        const targetId = button.dataset.target;
        const passwordInput = document.getElementById(targetId);
        const icon = button.querySelector('i');

        button.addEventListener('click', () => {
            if (passwordInput.type === 'password') {
                passwordInput.type = 'text';
                icon.classList.remove('bi-eye-slash');
                icon.classList.add('bi-eye');
            } else {
                passwordInput.type = 'password';
                icon.classList.remove('bi-eye');
                icon.classList.add('bi-eye-slash');
            }
        });
    }


    // --- Initialization ---
    async function init() {
        // Step 1: Fetch i18n data. This is critical for all UI text, including error messages.
        try {
            const response = await fetch("/static/i18nData.json");
            if (!response.ok) throw new Error(`HTTP error! status: ${response.status}`);
            i18nData = await response.json(); // Overwrite the initial fallback object
        } catch (error) {
            console.error("Fatal: Failed to load i18n data. Application cannot start.", error);
            const lang = getFromStorage('ui_language') || (navigator.language.toLowerCase().startsWith('en') ? 'en' : 'zh');
            currentLang = lang;
            alert(getText('init_i18n_failed_alert'));
            return; // Stop execution
        }

        // Step 2: Fetch other backend data
        isAdminMode = window.location.pathname.includes('/admin');
        try {
            const [metaRes, enginRes, paramsRes] = await Promise.all([
                fetch("/service/meta"), fetch('/service/engin-list'), fetch("/service/default-params")
            ]);
            if (!metaRes.ok || !enginRes.ok || !paramsRes.ok) {
                throw new Error("Failed to fetch initial data from server.");
            }
            const meta = await metaRes.json();
            versionDisplay.textContent = `v${meta.version}`;

            const enginList = await enginRes.json();

            // Populate convert engin select
            convertEnginSelect.innerHTML = ''; // Clear
            const defaultOption = document.createElement('option');
            defaultOption.value = 'identity';
            convertEnginSelect.appendChild(defaultOption);

            enginList.forEach(engin => {
                const option = document.createElement('option');
                option.value = engin;
                convertEnginSelect.appendChild(option);
            });

            defaultParams = await paramsRes.json();
        } catch (error) {
            console.error("Initialization failed:", error);
            alert(getText('init_failed_alert'));
            return;
        }

        // Step 3: Initialize i18n system (now that all data is loaded and dynamic elements are populated)
        initI18n();

        // Step 4: Restore user settings and update UI based on them
        workflowTypeSelect.value = getFromStorage('translator_last_workflow', 'markdown_based');
        autoWorkflowSwitch.checked = getFromStorage('translator_auto_workflow_enabled', 'true') === 'true';
        xlsxInsertModeSelect.value = getFromStorage('translator_xlsx_insert_mode', 'replace');
        xlsxSeparatorInput.value = getFromStorage('translator_xlsx_separator', '\\n');
        docxInsertModeSelect.value = getFromStorage('translator_docx_insert_mode', 'replace');
        docxSeparatorInput.value = getFromStorage('translator_docx_separator', '\\n');
        srtInsertModeSelect.value = getFromStorage('translator_srt_insert_mode', 'replace');
        srtSeparatorInput.value = getFromStorage('translator_srt_separator', '\\n');
        epubInsertModeSelect.value = getFromStorage('translator_epub_insert_mode', 'replace');
        epubSeparatorInput.value = getFromStorage('translator_epub_separator', '\\n');
        htmlInsertModeSelect.value = getFromStorage('translator_html_insert_mode', 'replace');
        htmlSeparatorInput.value = getFromStorage('translator_html_separator', ' ');
        jsonPathsTextarea.value = getFromStorage('translator_json_paths');
        platformSelect.value = getFromStorage('translator_last_platform', 'https://api.openai.com/v1');
        convertEnginSelect.value = getFromStorage('translator_convert_engin', 'mineru');
        toLangSelect.value = getFromStorage('translator_to_lang', '中文');
        customLangInput.value = getFromStorage('translator_custom_to_lang', '');
        formulaCheckbox.checked = getFromStorage('translator_formula_ocr', 'true') === 'true';
        codeCheckbox.checked = getFromStorage('translator_code_ocr', 'true') === 'true';
        customPromptTranslateArea.value = getFromStorage("custom_prompt");

        // Set thinking mode from storage or default
        const savedThinkingMode = getFromStorage('translator_thinking_mode', 'default');
        const thinkingRadioToSelect = document.querySelector(`#thinkingModeBtnGroup input[value="${savedThinkingMode}"]`);
        if (thinkingRadioToSelect) thinkingRadioToSelect.checked = true;

        // Initial UI updates based on restored settings
        updateWorkflowUI();
        updatePlatformUI();
        updateConvertEnginUI();
        updateCustomLangUI();

        // Setup sliders
        setupSlider(chunkSizeSlider, chunkSizeDisplay, chunkSizeReset, 'chunk_size', defaultParams);
        setupSlider(concurrentSlider, concurrentDisplay, concurrentReset, 'concurrent', defaultParams);
        setupSlider(temperatureSlider, temperatureDisplay, temperatureReset, 'temperature', defaultParams);

        // Setup other UI elements
        document.querySelectorAll('.toggle-password').forEach(button => setupPasswordToggle(button));

        // Restore tasks
        if (isAdminMode) {
            document.title = "DocuTranslate - Admin Panel";
            try {
                const response = await fetch('/service/task-list');
                if (!response.ok) throw new Error(`Failed to fetch task list: ${response.statusText}`);
                const allTaskIds = await response.json();
                if (allTaskIds && Array.isArray(allTaskIds) && allTaskIds.length > 0) {
                    allTaskIds.reverse().forEach(taskId => createTaskCard(taskId, true));
                }
            } catch (error) {
                console.error("Admin mode: Failed to load task list from server.", error);
                alert(getText('admin_tasklist_failed'));
            }
            updateTaskPlaceholderVisibility();
        } else {
            const savedTaskIds = JSON.parse(getFromStorage('active_task_ids', '[]'));
            if (savedTaskIds.length > 0) {
                savedTaskIds.forEach(taskId => createTaskCard(taskId, true));
            } else {
                createTaskCard();
            }
        }

        // Add event listeners for saving settings
        workflowTypeSelect.addEventListener('change', updateWorkflowUI);
        autoWorkflowSwitch.addEventListener('change', e => saveToStorage('translator_auto_workflow_enabled', e.target.checked));
        xlsxInsertModeSelect.addEventListener('change', e => {
            updateSeparatorVisibility(xlsxInsertModeSelect, xlsxSeparatorGroup);
            saveToStorage('translator_xlsx_insert_mode', e.target.value);
        });
        xlsxSeparatorInput.addEventListener('input', e => saveToStorage('translator_xlsx_separator', e.target.value));
        docxInsertModeSelect.addEventListener('change', e => {
            updateSeparatorVisibility(docxInsertModeSelect, docxSeparatorGroup);
            saveToStorage('translator_docx_insert_mode', e.target.value);
        });
        docxSeparatorInput.addEventListener('input', e => saveToStorage('translator_docx_separator', e.target.value));
        srtInsertModeSelect.addEventListener('change', e => {
            updateSeparatorVisibility(srtInsertModeSelect, srtSeparatorGroup);
            saveToStorage('translator_srt_insert_mode', e.target.value);
        });
        srtSeparatorInput.addEventListener('input', e => saveToStorage('translator_srt_separator', e.target.value));
        epubInsertModeSelect.addEventListener('change', e => {
            updateSeparatorVisibility(epubInsertModeSelect, epubSeparatorGroup);
            saveToStorage('translator_epub_insert_mode', e.target.value);
        });
        epubSeparatorInput.addEventListener('input', e => saveToStorage('translator_epub_separator', e.target.value));
        htmlInsertModeSelect.addEventListener('change', e => {
            updateSeparatorVisibility(htmlInsertModeSelect, htmlSeparatorGroup);
            saveToStorage('translator_html_insert_mode', e.target.value);
        });
        htmlSeparatorInput.addEventListener('input', e => saveToStorage('translator_html_separator', e.target.value));
        jsonPathsTextarea.addEventListener('input', e => saveToStorage('translator_json_paths', e.target.value));
        platformSelect.addEventListener('change', updatePlatformUI);
        apikeyInput.addEventListener('input', e => saveToStorage(`translator_platform_${platformSelect.value}_apikey`, e.target.value));
        modelInput.addEventListener('input', e => saveToStorage(`translator_platform_${platformSelect.value}_model_id`, e.target.value));
        baseUrlInput.addEventListener('input', e => {
            if (platformSelect.value === 'custom') saveToStorage('translator_platform_custom_base_url', e.target.value);
        });
        convertEnginSelect.addEventListener('change', () => updateConvertEnginUI(false));
        mineruTokenInput.addEventListener('input', e => saveToStorage('translator_mineru_token', e.target.value));
        toLangSelect.addEventListener('change', e => {
            saveToStorage('translator_to_lang', e.target.value);
            updateCustomLangUI();
        });
        customLangInput.addEventListener('input', e => saveToStorage('translator_custom_to_lang', e.target.value));
        document.querySelectorAll('#thinkingModeBtnGroup input[name="thinking"]').forEach(radio => {
            radio.addEventListener('change', (e) => {
                saveToStorage('translator_thinking_mode', e.target.value);
            });
        });
        formulaCheckbox.addEventListener('change', e => saveToStorage('translator_formula_ocr', e.target.checked));
        codeCheckbox.addEventListener('change', e => saveToStorage('translator_code_ocr', e.target.checked));
        customPromptTranslateArea.addEventListener('input', () => saveToStorage("custom_prompt", customPromptTranslateArea.value));

        // Add task button listener
        addNewTaskBtn.addEventListener('click', () => createTaskCard());

        // Add preview listeners
        setBilingualViewBtn.addEventListener('click', () => setPreviewDisplayMode('bilingual'));
        setTranslatedOnlyViewBtn.addEventListener('click', () => setPreviewDisplayMode('translatedOnly'));
        window.addEventListener('resize', () => {
            // Re-initialize split view on resize if canvas is open
            if (previewOffcanvasEl.classList.contains('show')) {
                setPreviewDisplayMode(originalPreviewContainer.style.display !== 'none' ? 'bilingual' : 'translatedOnly');
            }
        });
    }

    // --- Theme switcher logic ---
    const getPreferredTheme = () => {
        const storedTheme = localStorage.getItem('theme');
        if (storedTheme) {
            return storedTheme;
        }
        return 'auto';
    };
    const setTheme = theme => {
        if (theme === 'auto') {
            document.documentElement.setAttribute('data-bs-theme', window.matchMedia('(prefers-color-scheme: dark)').matches ? 'dark' : 'light');
        } else {
            document.documentElement.setAttribute('data-bs-theme', theme);
        }
    };
    const showActiveTheme = (theme) => {
        document.querySelectorAll('[data-bs-theme-value]').forEach(element => {
            element.classList.remove('active');
        });
        const activeButton = document.querySelector(`[data-bs-theme-value="${theme}"]`);
        if (activeButton) {
            activeButton.classList.add('active');
        }
    };
    const preferredTheme = getPreferredTheme();
    setTheme(preferredTheme);
    showActiveTheme(preferredTheme);
    window.matchMedia('(prefers-color-scheme: dark)').addEventListener('change', () => {
        const storedTheme = localStorage.getItem('theme');
        if (storedTheme === 'auto' || !storedTheme) {
            setTheme('auto');
        }
    });
    document.querySelectorAll('[data-bs-theme-value]').forEach(toggle => {
        toggle.addEventListener('click', () => {
            const theme = toggle.getAttribute('data-bs-theme-value');
            localStorage.setItem('theme', theme);
            setTheme(theme);
            showActiveTheme(theme);
        });
    });

    // --- Start the application ---
    document.addEventListener('DOMContentLoaded', init);
</script>
</body>
</html>
\ No newline at end of file
+<!DOCTYPE html>
<html lang="zh-CN" data-bs-theme="auto">
<head>
    <meta charset="UTF-8">
    <meta name="viewport" content="width=device-width, initial-scale=1.0">

    <title data-i18n-title="pageTitle">DocuTranslate - 交互式文档翻译</title>
    <link rel="icon" href="/static/favicon.ico" type="image/x-icon">
    <!-- Bootstrap CSS -->
    <link href="/static/bootstrap.css" rel="stylesheet" crossorigin="anonymous">
    <!-- Bootstrap Icons -->
    <link rel="stylesheet" href="/static/bootstrap-icons.css">

    <style>
        body {
            background-color: var(--bs-body-bg);
        }

        .main-container {
            display: flex;
            flex-direction: column;
            height: 100vh;
            padding-top: 1rem;
            padding-bottom: 1rem;
        }

        .settings-panel {
            height: calc(100vh - 2rem);
            overflow-y: auto;
            padding-right: 15px; /* for scrollbar */
        }

        .task-area {
            height: calc(100vh - 2rem);
            overflow-y: auto;
        }

        .task-card {
            transition: all 0.3s ease-in-out;
        }

        .task-id-placeholder {
            color: var(--bs-secondary-color);
            font-style: italic;
        }

        .log-area {
            height: 150px;
            background-color: var(--bs-tertiary-bg);
            border: 1px solid var(--bs-border-color);
            border-radius: .375rem;
            font-family: monospace;
            font-size: 0.8rem;
            padding: 10px;
            overflow-y: auto;
            white-space: pre-wrap;
            word-break: break-all;
        }

        .file-drop-area {
            border: 2px dashed var(--bs-secondary-bg);
            border-radius: .375rem;
            padding: 2rem;
            text-align: center;
            cursor: pointer;
            transition: all 0.2s ease-in-out;
            background-color: var(--bs-body-bg);
        }

        .file-drop-area.drag-over {
            border-color: var(--bs-primary);
            background-color: var(--bs-secondary-bg);
        }

        .file-drop-area.file-selected {
            border-style: solid;
            border-color: var(--bs-success);
            background-color: var(--bs-success-bg-subtle);
        }

        .file-drop-area.input-error {
            border-color: var(--bs-danger);
        }

        .file-name-display.input-error-text {
            color: var(--bs-danger);
            font-weight: bold;
        }

        #printFrame, #translatedPreviewFrame {
            border: none;
            width: 100%;
        }

        #previewOffcanvas {
            --bs-offcanvas-width: 95vw;
            max-width: 1600px;
        }

        .preview-split-container {
            display: flex;
            flex-direction: row;
            height: 90%;
        }

        .preview-pane-wrapper {
            display: flex;
            flex-direction: column;
            overflow: hidden; /* Important for split.js */
        }

        .preview-pane-wrapper h6 {
            flex-shrink: 0;
            padding: 0.25rem;
        }

        .preview-pane-wrapper .preview-pane {
            flex-grow: 1; /* Make the inner pane grow */
            border: 1px solid var(--bs-border-color);
            border-radius: .375rem;
            overflow: auto;
        }

        .gutter {
            background-color: var(--bs-tertiary-bg);
            background-repeat: no-repeat;
            background-position: 50%;
        }

        .gutter.gutter-horizontal {
            cursor: col-resize;
            border-left: 1px solid var(--bs-border-color);
            border-right: 1px solid var(--bs-border-color);
        }

        .gutter.gutter-vertical {
            cursor: row-resize;
            border-top: 1px solid var(--bs-border-color);
            border-bottom: 1px solid var(--bs-border-color);
        }


        .preview-pane iframe, .preview-pane pre {
            width: 100%;
            height: 95%;
            border: none;
            margin: 0;
            padding: 0;
            overflow: auto;
            background-color: var(--bs-body-bg);
        }

        .slider-reset-btn {
            visibility: hidden;
        }

        .bottom-left-controls {
            position: fixed;
            bottom: 1rem;
            left: 1rem;
            z-index: 1050;
            display: flex;
            gap: 0.5rem;
        }

        @media (max-width: 991.98px) {
            .main-container {
                height: auto;
                padding-bottom: 6rem;
            }

            .settings-panel, .task-area {
                height: auto;
                overflow-y: visible;
            }

            .settings-panel {
                padding-right: 0;
                margin-bottom: 2rem;
            }
        }

        @media (max-width: 767.98px) {
            .task-card .col-md-7 {
                margin-top: 1.5rem;
            }

            #previewOffcanvas {
                --bs-offcanvas-width: 100vw;
            }
        }
    </style>
</head>
<body>

<div class="container-fluid main-container">
    <div class="row gx-4">
        <!-- Left: Settings Panel -->
        <div class="col-lg-4">
            <div class="settings-panel">
                <div class="d-flex justify-content-between align-items-center mb-3">
                    <div class="d-flex align-items-center">
                        <h4 class="mb-0 me-3"><i class="bi"></i>DocuTranslate</h4>
                        <span id="versionDisplay" class="badge bg-success me-4"></span>
                        <div class="btn-group">
                            <button type="button" class="btn btn-sm btn-outline-info" data-bs-toggle="modal"
                                    data-bs-target="#tutorialModal">
                                <i class="bi bi-question-circle-fill me-1"></i><span data-i18n="tutorialBtn">教程</span>
                            </button>
                            <button type="button" class="btn btn-sm btn-outline-warning" data-bs-toggle="modal"
                                    data-bs-target="#contributorsModal">
                                <i class="bi bi-people-fill me-1"></i><span
                                    data-i18n="projectContributeBtn">项目协作</span>
                            </button>
                        </div>
                    </div>
                </div>

                <form id="translateForm">
                    <div class="accordion" id="settingsAccordion">

                        <!-- Workflow Selection -->
                        <div class="accordion-item" id="workflowSettingsContainer">
                            <h2 class="accordion-header" id="headingZero">
                                <button class="accordion-button" type="button" data-bs-toggle="collapse"
                                        data-bs-target="#collapseZero" aria-expanded="true"
                                        aria-controls="collapseZero">
                                    <strong><i class="bi bi-diagram-3 me-2"></i><span
                                            data-i18n="workflowTitle">1. 选择工作流</span></strong>
                                </button>
                            </h2>
                            <div id="collapseZero" class="accordion-collapse collapse show"
                                 aria-labelledby="headingZero">
                                <div class="accordion-body">
                                    <select class="form-select" id="workflowTypeSelect">
                                        <option value="markdown_based" data-i18n="workflowOptionMarkdown">转Markdown再翻译
                                            (.pdf/.md/.png等)
                                        </option>
                                        <option value="txt" data-i18n="workflowOptionTxt">纯文本翻译 (.txt)</option>
                                        <option value="json" data-i18n="workflowOptionJson">JSON翻译 (.json)</option>
                                        <option value="docx" data-i18n="workflowOptionDocx">DOCX翻译 (.docx)</option>
                                        <option value="xlsx" data-i18n="workflowOptionXlsx">XLSX翻译 (.xlsx)</option>
                                        <option value="srt" data-i18n="workflowOptionSrt">SRT字幕翻译 (.srt)</option>
                                        <option value="epub" data-i18n="workflowOptionEpub">EPUB翻译 (.epub)</option>
                                        <option value="html" data-i18n="workflowOptionHtml">HTML翻译 (.html)</option>
                                    </select>
                                    <div class="form-check form-switch mt-2">
                                        <input class="form-check-input" type="checkbox" role="switch"
                                               id="autoWorkflowSwitch">
                                        <label class="form-check-label" for="autoWorkflowSwitch"
                                               data-i18n="autoWorkflowLabel">自动选择工作流</label>
                                    </div>
                                </div>
                            </div>
                        </div>

                        <!-- [NEW] DOCX Settings Container -->
                        <div class="accordion-item" id="docxSettingsContainer" style="display: none;">
                            <h2 class="accordion-header" id="headingDocx">
                                <button class="accordion-button collapsed" type="button" data-bs-toggle="collapse"
                                        data-bs-target="#collapseDocx" aria-expanded="false"
                                        aria-controls="collapseDocx">
                                    <strong id="docxSettingsTitle"><i class="bi bi-file-earmark-word-fill me-2"></i>2.
                                        DOCX翻译选项</strong>
                                </button>
                            </h2>
                            <div id="collapseDocx" class="accordion-collapse collapse" aria-labelledby="headingDocx">
                                <div class="accordion-body">
                                    <div class="mb-3">
                                        <label for="docx_insert_mode" class="form-label" data-i18n="insertModeLabel">插入模式</label>
                                        <select class="form-select" id="docx_insert_mode" name="insert_mode">
                                            <option value="replace" data-i18n="insertModeReplace">替换原文 (Replace)
                                            </option>
                                            <option value="append" data-i18n="insertModeAppend">附加到原文后 (Append)
                                            </option>
                                            <option value="prepend" data-i18n="insertModePrepend">附加到原文前
                                                (Prepend)
                                            </option>
                                        </select>
                                        <div class="form-text" data-i18n="insertModeHelpDocx">
                                            选择如何将翻译后的文本插入。
                                        </div>
                                    </div>
                                    <div class="mb-3" id="docxSeparatorGroup" style="display: none;">
                                        <label for="docx_separator" class="form-label"
                                               data-i18n="separatorLabel">分隔符</label>
                                        <input type="text" class="form-control" id="docx_separator" name="separator"
                                               data-i18n-placeholder="separatorPlaceholder"
                                               placeholder="例如: \n---翻译---\n">
                                        <div class="form-text" data-i18n="separatorHelp">
                                            当插入模式为附加或前置时，用于分隔原文和译文的字符。<code>\n</code> 代表换行。
                                        </div>
                                    </div>
                                </div>
                            </div>
                        </div>

                        <!-- XLSX Settings Container -->
                        <div class="accordion-item" id="xlsxSettingsContainer" style="display: none;">
                            <h2 class="accordion-header" id="headingXlsx">
                                <button class="accordion-button collapsed" type="button" data-bs-toggle="collapse"
                                        data-bs-target="#collapseXlsx" aria-expanded="false"
                                        aria-controls="collapseXlsx">
                                    <strong id="xlsxSettingsTitle"><i
                                            class="bi bi-file-earmark-spreadsheet-fill me-2"></i>2.
                                        XLSX翻译选项</strong>
                                </button>
                            </h2>
                            <div id="collapseXlsx" class="accordion-collapse collapse" aria-labelledby="headingXlsx">
                                <div class="accordion-body">
                                    <div class="mb-3">
                                        <label for="xlsx_insert_mode" class="form-label" data-i18n="insertModeLabel">插入模式</label>
                                        <select class="form-select" id="xlsx_insert_mode" name="insert_mode">
                                            <option value="replace" data-i18n="insertModeReplace">替换原文 (Replace)
                                            </option>
                                            <option value="append" data-i18n="insertModeAppend">附加到原文后 (Append)
                                            </option>
                                            <option value="prepend" data-i18n="insertModePrepend">附加到原文前
                                                (Prepend)
                                            </option>
                                        </select>
                                        <div class="form-text" data-i18n="insertModeHelpXlsx">
                                            选择如何将翻译后的文本插入到单元格中。
                                        </div>
                                    </div>
                                    <div class="mb-3" id="xlsxSeparatorGroup" style="display: none;">
                                        <label for="xlsx_separator" class="form-label"
                                               data-i18n="separatorLabel">分隔符</label>
                                        <input type="text" class="form-control" id="xlsx_separator" name="separator"
                                               data-i18n-placeholder="separatorPlaceholderSimple"
                                               placeholder="例如: \n---\n">
                                        <div class="form-text" data-i18n="separatorHelp">
                                            当插入模式为附加或前置时，用于分隔原文和译文的字符。<code>\n</code> 代表换行。
                                        </div>
                                    </div>
                                </div>
                            </div>
                        </div>

                        <!-- [NEW] SRT Settings Container -->
                        <div class="accordion-item" id="srtSettingsContainer" style="display: none;">
                            <h2 class="accordion-header" id="headingSrt">
                                <button class="accordion-button collapsed" type="button" data-bs-toggle="collapse"
                                        data-bs-target="#collapseSrt" aria-expanded="false"
                                        aria-controls="collapseSrt">
                                    <strong id="srtSettingsTitle"><i class="bi bi-filetype-srt me-2"></i>2.
                                        SRT翻译选项</strong>
                                </button>
                            </h2>
                            <div id="collapseSrt" class="accordion-collapse collapse" aria-labelledby="headingSrt">
                                <div class="accordion-body">
                                    <div class="mb-3">
                                        <label for="srt_insert_mode" class="form-label"
                                               data-i18n="insertModeLabel">插入模式</label>
                                        <select class="form-select" id="srt_insert_mode" name="insert_mode">
                                            <option value="replace" data-i18n="insertModeReplace">替换原文 (Replace)
                                            </option>
                                            <option value="append" data-i18n="insertModeAppend">附加到原文后 (Append)
                                            </option>
                                            <option value="prepend" data-i18n="insertModePrepend">附加到原文前
                                                (Prepend)
                                            </option>
                                        </select>
                                        <div class="form-text" data-i18n="insertModeHelpSrt">
                                            选择如何将翻译后的文本插入。
                                        </div>
                                    </div>
                                    <div class="mb-3" id="srtSeparatorGroup" style="display: none;">
                                        <label for="srt_separator" class="form-label"
                                               data-i18n="separatorLabel">分隔符</label>
                                        <input type="text" class="form-control" id="srt_separator" name="separator"
                                               data-i18n-placeholder="separatorPlaceholderSimple"
                                               placeholder="例如: \n---\n">
                                        <div class="form-text" data-i18n="separatorHelp">
                                            当插入模式为附加或前置时，用于分隔原文和译文的字符。<code>\n</code> 代表换行。
                                        </div>
                                    </div>
                                </div>
                            </div>
                        </div>

                        <!-- [NEW] EPUB Settings Container -->
                        <div class="accordion-item" id="epubSettingsContainer" style="display: none;">
                            <h2 class="accordion-header" id="headingEpub">
                                <button class="accordion-button collapsed" type="button" data-bs-toggle="collapse"
                                        data-bs-target="#collapseEpub" aria-expanded="false"
                                        aria-controls="collapseEpub">
                                    <strong id="epubSettingsTitle"><i class="bi bi-book me-2"></i>2.
                                        EPUB翻译选项</strong>
                                </button>
                            </h2>
                            <div id="collapseEpub" class="accordion-collapse collapse" aria-labelledby="headingEpub">
                                <div class="accordion-body">
                                    <div class="mb-3">
                                        <label for="epub_insert_mode" class="form-label" data-i18n="insertModeLabel">插入模式</label>
                                        <select class="form-select" id="epub_insert_mode" name="insert_mode">
                                            <option value="replace" data-i18n="insertModeReplace">替换原文 (Replace)
                                            </option>
                                            <option value="append" data-i18n="insertModeAppend">附加到原文后 (Append)
                                            </option>
                                            <option value="prepend" data-i18n="insertModePrepend">附加到原文前
                                                (Prepend)
                                            </option>
                                        </select>
                                        <div class="form-text" data-i18n="insertModeHelpEpub">
                                            选择如何将翻译后的文本插入。
                                        </div>
                                    </div>
                                    <div class="mb-3" id="epubSeparatorGroup" style="display: none;">
                                        <label for="epub_separator" class="form-label"
                                               data-i18n="separatorLabel">分隔符</label>
                                        <input type="text" class="form-control" id="epub_separator" name="separator"
                                               data-i18n-placeholder="separatorPlaceholderSimple"
                                               placeholder="例如: \n---\n">
                                        <div class="form-text" data-i18n="separatorHelp">
                                            当插入模式为附加或前置时，用于分隔原文和译文的字符。<code>\n</code> 代表换行。
                                        </div>
                                    </div>
                                </div>
                            </div>
                        </div>

                        <!-- [NEW] HTML Settings Container -->
                        <div class="accordion-item" id="htmlSettingsContainer" style="display: none;">
                            <h2 class="accordion-header" id="headingHtml">
                                <button class="accordion-button collapsed" type="button" data-bs-toggle="collapse"
                                        data-bs-target="#collapseHtml" aria-expanded="false"
                                        aria-controls="collapseHtml">
                                    <strong id="htmlSettingsTitle"><i class="bi bi-filetype-html me-2"></i>2.
                                        HTML翻译选项</strong>
                                </button>
                            </h2>
                            <div id="collapseHtml" class="accordion-collapse collapse" aria-labelledby="headingHtml">
                                <div class="accordion-body">
                                    <div class="mb-3">
                                        <label for="html_insert_mode" class="form-label" data-i18n="insertModeLabel">插入模式</label>
                                        <select class="form-select" id="html_insert_mode" name="insert_mode">
                                            <option value="replace" data-i18n="insertModeReplace">替换原文 (Replace)
                                            </option>
                                            <option value="append" data-i18n="insertModeAppend">附加到原文后 (Append)
                                            </option>
                                            <option value="prepend" data-i18n="insertModePrepend">附加到原文前
                                                (Prepend)
                                            </option>
                                        </select>
                                        <div class="form-text" data-i18n="insertModeHelpHtml">
                                            选择如何将翻译后的文本插入。
                                        </div>
                                    </div>
                                    <div class="mb-3" id="htmlSeparatorGroup" style="display: none;">
                                        <label for="html_separator" class="form-label"
                                               data-i18n="separatorLabel">分隔符</label>
                                        <input type="text" class="form-control" id="html_separator" name="separator"
                                               data-i18n-placeholder="separatorPlaceholderSimple"
                                               placeholder="例如: <!-- translated -->">
                                        <div class="form-text" data-i18n="separatorHelp">
                                            当插入模式为附加或前置时，用于分隔原文和译文的字符。<code>\n</code> 代表换行。
                                        </div>
                                    </div>
                                </div>
                            </div>
                        </div>


                        <!-- JSON Paths Settings Container -->
                        <div class="accordion-item" id="jsonSettingsContainer" style="display: none;">
                            <h2 class="accordion-header" id="headingJson">
                                <button class="accordion-button collapsed" type="button" data-bs-toggle="collapse"
                                        data-bs-target="#collapseJson" aria-expanded="false"
                                        aria-controls="collapseJson">
                                    <strong id="jsonSettingsTitle"><i class="bi bi-signpost-split me-2"></i>2. JSON路径配置</strong>
                                </button>
                            </h2>
                            <div id="collapseJson" class="accordion-collapse collapse" aria-labelledby="headingJson">
                                <div class="accordion-body">
                                    <div class="mb-3">
                                        <label for="json_paths_textarea" class="form-label" data-i18n="jsonPathLabel">需要翻译的JSON路径</label>
                                        <textarea class="form-control" id="json_paths_textarea" name="json_paths"
                                                  rows="4" required
                                                  data-i18n-placeholder="jsonPathPlaceholder" placeholder="每行一个路径, 例如:
$.name
$.*"></textarea>
                                        <div class="form-text" data-i18n="jsonPathHelp">
                                            采用<code>jsonpath-ng</code>的路径选择语法，每一行表示一个json路径
                                        </div>
                                    </div>
                                </div>
                            </div>
                        </div>

                        <!-- Parsing Engine Settings Container -->
                        <div class="accordion-item" id="parsingSettingsContainer">
                            <h2 class="accordion-header" id="headingOne">
                                <button class="accordion-button collapsed" type="button" data-bs-toggle="collapse"
                                        data-bs-target="#collapseOne" aria-expanded="false" aria-controls="collapseOne">
                                    <strong id="parsingSettingsTitle"><i class="bi bi-file-earmark-binary me-2"></i>2.
                                        解析配置</strong>
                                </button>
                            </h2>
                            <div id="collapseOne" class="accordion-collapse collapse" aria-labelledby="headingOne">
                                <div class="accordion-body">
                                    <div class="mb-3">
                                        <label for="convert_engine" class="form-label" data-i18n="parsingEngineLabel">解析引擎</label>
                                        <select class="form-select" id="convert_engine" name="convert_engine">
                                            <!-- Options will be populated by JS -->
                                        </select>
                                        <div class="form-text" data-i18n="parsingEngineHelp">
                                            如果上传的文件本身是.md格式，此项可不选。
                                        </div>
                                    </div>
                                    <div class="mb-3" id="mineruTokenGroup">
                                        <label for="mineru_token" class="form-label">
                                            Mineru Token
                                            <a href="https://mineru.net/apiManage/token" target="_blank" class="ms-1"
                                               data-i18n-title="getMineruTokenTitle" title="获取Mineru Token"><i
                                                    class="bi bi-box-arrow-up-right"></i></a>
                                        </label>
                                        <div class="input-group">
                                            <input type="password" class="form-control" id="mineru_token"
                                                   name="mineru_token" data-i18n-placeholder="mineruTokenPlaceholder"
                                                   placeholder="使用Mineru引擎时需要">
                                            <button class="btn btn-outline-secondary toggle-password" type="button"
                                                    data-target="mineru_token">
                                                <i class="bi bi-eye-slash"></i>
                                            </button>
                                        </div>
                                    </div>
                                    <!-- NEW: Mineru Model Version -->
                                    <div class="mb-3" id="mineruModelVersionGroup">
                                        <label for="model_version" class="form-label" data-i18n="modelVersionLabel">Mineru 模型版本</label>
                                        <select class="form-select" id="model_version" name="model_version">
                                            <option value="vlm" data-i18n="modelVersionVlm">VLM</option>
                                            <option value="pipline" data-i18n="modelVersionPipline">Pipeline</option>
                                        </select>
                                        <div class="form-text" data-i18n="modelVersionHelp">
                                            mineru VLM是更新的内测模型。
                                        </div>
                                    </div>
                                    <div class="form-check form-switch mb-2">
                                        <input class="form-check-input" type="checkbox" role="switch"
                                               id="formula_ocr"
                                               name="formula_ocr" checked>
                                        <label class="form-check-label" for="formula_ocr" data-i18n="formulaOcrLabel">公式识别</label>
                                    </div>
                                    <div class="form-check form-switch mb-2" id="codeOcrSwitch">
                                        <input class="form-check-input" type="checkbox" role="switch" id="code_ocr"
                                               name="code_ocr" checked>
                                        <label class="form-check-label" for="code_ocr"
                                               data-i18n="codeOcrLabel">代码识别</label>
                                    </div>
                                </div>
                            </div>
                        </div>

                        <!-- AI Settings -->
                        <div class="accordion-item">
                            <h2 class="accordion-header" id="headingTwo">
                                <button class="accordion-button collapsed" type="button" data-bs-toggle="collapse"
                                        data-bs-target="#collapseTwo" aria-expanded="false" aria-controls="collapseTwo">
                                    <strong id="aiSettingsTitle"><i class="bi bi-robot me-2"></i>3. 翻译模型</strong>
                                </button>
                            </h2>
                            <div id="collapseTwo" class="accordion-collapse collapse" aria-labelledby="headingTwo">
                                <div class="accordion-body">
                                    <div class="mb-3">
                                        <label for="platform_select" class="form-label"
                                               data-i18n="platformLabel">选择平台</label>
                                        <select class="form-select" id="platform_select">
                                            <option value="custom" data-i18n="platformCustom">自定义接口</option>
                                            <option value="https://api.openai.com/v1">OpenAI</option>
                                            <option value="https://generativelanguage.googleapis.com/v1beta/openai/">
                                                Gemini
                                            </option>
                                            <option value="https://open.bigmodel.cn/api/paas/v4">智谱AI</option>
                                            <option value="https://api.deepseek.com/v1">DeepSeek</option>
                                            <option value="https://dashscope.aliyuncs.com/compatible-mode/v1">
                                                阿里云百炼
                                            </option>
                                            <option value="https://www.dmxapi.cn/v1">DMXAPI</option>
                                            <option value="https://openrouter.ai/api/v1">OpenRouter</option>
                                            <option value="https://ark.cn-beijing.volces.com/api/v3">火山引擎</option>
                                            <option value="https://api.siliconflow.cn/v1">硅基流动</option>
                                        </select>
                                    </div>
                                    <div class="mb-3" id="baseUrlGroup">
                                        <label for="base_url" class="form-label" data-i18n="baseUrlLabel">API 地址 (Base
                                            URL)</label>
                                        <input type="url" class="form-control" id="base_url" name="base_url" required
                                               data-i18n-placeholder="baseUrlPlaceholder" placeholder="OpenAi兼容地址">
                                    </div>
                                    <div class="mb-3">
                                        <label for="api_key" class="form-label">
                                            API Key
                                            <a href="#" target="_blank" class="ms-1" id="api_href"
                                               data-i18n-title="getApiKeyTitle" title="获取API Key"><i
                                                    class="bi bi-box-arrow-up-right"></i></a>
                                        </label>
                                        <div class="input-group">
                                            <input type="password" class="form-control" id="api_key" name="api_key"
                                                   required
                                                   data-i18n-placeholder="apiKeyPlaceholder"
                                                   placeholder="请输入您的API Key">
                                            <button class="btn btn-outline-secondary toggle-password" type="button"
                                                    data-target="api_key">
                                                <i class="bi bi-eye-slash"></i>
                                            </button>
                                        </div>
                                    </div>
                                    <div class="mb-3">
                                        <label for="model_id" class="form-label" data-i18n="modelIdLabel">模型
                                            ID</label>
                                        <input type="text" class="form-control" id="model_id" name="model_id" required
                                               data-i18n-placeholder="modelIdPlaceholder"
                                               placeholder="例如: gpt-4o, glm-4">
                                    </div>
                                </div>
                            </div>
                        </div>

                        <!-- Translation Settings -->
                        <div class="accordion-item">
                            <h2 class="accordion-header" id="headingThree">
                                <button class="accordion-button collapsed" type="button" data-bs-toggle="collapse"
                                        data-bs-target="#collapseThree" aria-expanded="false"
                                        aria-controls="collapseThree">
                                    <strong id="translationSettingsTitle"><i class="bi bi-translate me-2"></i>4. 翻译配置</strong>
                                </button>
                            </h2>
                            <div id="collapseThree" class="accordion-collapse collapse" aria-labelledby="headingThree">
                                <div class="accordion-body">
                                    <div class="mb-3">
                                        <label for="to_lang" class="form-label"
                                               data-i18n="targetLanguageLabel">目标语言</label>
                                        <select class="form-select" id="to_lang" name="to_lang">
                                            <option value="中文">中文(简体中文)</option>
                                            <option value="英文">英文(English)</option>
                                            <option value="西班牙文">西班牙文(Español)</option>
                                            <option value="法文">法文(Français)</option>
                                            <option value="德文">德文(Deutsch)</option>
                                            <option value="日文">日文(日本語)</option>
                                            <option value="韩文">韩文(한국어)</option>
                                            <option value="俄文">俄文(Русский)</option>
                                            <option value="葡萄牙文">葡萄牙文(Português)</option>
                                            <option value="阿拉伯文">阿拉伯文(العَرَبِيَّة)</option>
                                            <option value="越南文">越南文(tiếng Việt)</option>
                                            <option value="custom" data-i18n="targetLanguageCustom">其它 (自定义)
                                            </option>
                                        </select>
                                        <div class="mt-2" id="customLangGroup" style="display: none;">
                                            <input type="text" class="form-control" id="custom_to_lang"
                                                   name="custom_to_lang" data-i18n-placeholder="customLangPlaceholder"
                                                   placeholder="请输入目标语言, 例如: Italian">
                                        </div>
                                    </div>
                                    <div class="mb-3">
                                        <label class="form-label" data-i18n="thinkingModeLabel">思考模式</label><i
                                            class="bi bi-question-circle ms-2 tooltip-icon"
                                            data-bs-toggle="tooltip"
                                            data-bs-placement="top"
                                            data-i18n-title="thinkingModeTooltip"
                                            data-bs-title="设置混合推理模型的思考模式，目前支持智谱平台的glm-4.5系列、阿里云的qwen3系列、火山引擎的Doubao-Seed-1.6系列等">
                                    </i>
                                        <div id="thinkingModeBtnGroup" class="btn-group w-100" role="group"
                                             aria-label="Thinking Mode Toggle">
                                            <input type="radio" class="btn-check" name="thinking" id="thinkingEnable"
                                                   value="enable" autocomplete="off">
                                            <label class="btn btn-outline-primary" for="thinkingEnable"
                                                   data-i18n="thinkingModeEnable">启用</label>

                                            <input type="radio" class="btn-check" name="thinking" id="thinkingDisable"
                                                   value="disable" autocomplete="off">
                                            <label class="btn btn-outline-primary" for="thinkingDisable"
                                                   data-i18n="thinkingModeDisable">禁用</label>

                                            <input type="radio" class="btn-check" name="thinking" id="thinkingDefault"
                                                   value="default" autocomplete="off">
                                            <label class="btn btn-outline-primary" for="thinkingDefault"
                                                   data-i18n="thinkingModeDefault">默认</label>
                                        </div>
                                    </div>
                                    <div class="mb-3">
                                        <label for="custom_prompt" class="form-label" data-i18n="customPromptLabel">自定义Prompt</label>
                                        <textarea class="form-control" id="custom_prompt"
                                                  name="custom_prompt" rows="3"
                                                  data-i18n-placeholder="customPromptPlaceholder"
                                                  placeholder="可选，如“人名保持原文不翻译”"></textarea>
                                    </div>
                                </div>
                            </div>
                        </div>

                        <!-- Other Settings -->
                        <div class="accordion-item">
                            <h2 class="accordion-header" id="headingFour">
                                <button class="accordion-button collapsed" type="button" data-bs-toggle="collapse"
                                        data-bs-target="#collapseFour" aria-expanded="false"
                                        aria-controls="collapseFour">
                                    <strong id="advancedSettingsTitle"><i class="bi bi-sliders me-2"></i>5.
                                        高级参数</strong>
                                </button>
                            </h2>
                            <div id="collapseFour" class="accordion-collapse collapse" aria-labelledby="headingFour">
                                <div class="accordion-body">
                                    <div class="mb-3">
                                        <label for="chunk-size-slider"
                                               class="form-label d-flex justify-content-between">
                                            <span><span data-i18n="chunkSizeLabel">分块大小</span>: <span
                                                    id="chunk-size-display"></span></span>
                                            <button type="button"
                                                    class="btn btn-sm btn-outline-secondary py-0 px-1 slider-reset-btn"
                                                    id="chunk-size-reset" data-i18n="resetBtn">重置
                                            </button>
                                        </label>
                                        <input type="range" class="form-range" min="1000" max="8000" step="100"
                                               id="chunk-size-slider" name="chunk_size">
                                    </div>
                                    <div class="mb-3">
                                        <label for="concurrent-slider"
                                               class="form-label d-flex justify-content-between">
                                            <span><span data-i18n="concurrentLabel">并发数</span>: <span
                                                    id="concurrent-display"></span></span>
                                            <button type="button"
                                                    class="btn btn-sm btn-outline-secondary py-0 px-1 slider-reset-btn"
                                                    id="concurrent-reset" data-i18n="resetBtn">重置
                                            </button>
                                        </label>
                                        <input type="range" class="form-range" min="1" max="60" step="1"
                                               id="concurrent-slider" name="concurrent">
                                    </div>
                                    <div class="mb-3">
                                        <label for="temperature-slider"
                                               class="form-label d-flex justify-content-between">
                                            <span>Temperature: <span id="temperature-display"></span></span>
                                            <button type="button"
                                                    class="btn btn-sm btn-outline-secondary py-0 px-1 slider-reset-btn"
                                                    id="temperature-reset" data-i18n="resetBtn">重置
                                            </button>
                                        </label>
                                        <input type="range" class="form-range" min="0" max="2" step="0.1"
                                               id="temperature-slider" name="temperature">
                                    </div>
                                </div>
                            </div>
                        </div>
                    </div>
                </form>

                <!-- 项目信息 -->
                <div class="mt-4 text-left text-muted small">
                    <p class="bi bi-github mb-1" data-i18n="githubInfo">
                        GitHub主页(欢迎star❤): <br/>
                        <a href="https://github.com/xunbu/docutranslate" target="_blank" rel="noopener noreferrer">https://github.com/xunbu/docutranslate</a>
                    </p>
                    <p class="bi bi-tencent-qq mb-0" data-i18n="qqGroupInfo">
                        交流QQ群: 1047781902
                    </p>
                </div>

            </div>
        </div>

        <!-- Right: Task Area -->
        <div class="col-lg-8">
            <div class="task-area" id="task-area-container">
                <div class="d-flex justify-content-between align-items-center mb-3">
                    <h4 class="mb-0"><i class="bi bi-list-task me-2"></i><span data-i18n="taskListTitle">任务列表</span>
                    </h4>
                    <button class="btn btn-primary" id="addNewTaskBtn"><i class="bi bi-plus-circle-fill me-2"></i><span
                            data-i18n="newTaskBtn">新建任务</span>
                    </button>
                </div>
                <div id="task-container">
                    <!-- Task cards will be injected here -->
                </div>
                <div id="no-task-placeholder" class="text-center text-muted mt-5">
                    <i class="bi bi-journal-plus" style="font-size: 4rem;"></i>
                    <p class="mt-3" data-i18n="noTaskPlaceholder">当前没有任务，点击“新建任务”开始吧！</p>
                </div>
            </div>
        </div>
    </div>
</div>

<!-- Task Card Template -->
<template id="taskCardTemplate">
    <div class="card mb-3 task-card">
        <div class="card-header d-flex justify-content-between align-items-center">
            <span class="fw-bold"><span data-i18n="taskCardIdLabel">任务 ID</span>: <code class="task-id-display"><span
                    class="task-id-placeholder" data-i18n="taskCardIdPlaceholder">等待提交...</span></code></span>
            <button type="button" class="btn-close remove-task-btn" aria-label="Close"></button>
        </div>
        <div class="card-body">
            <div class="row">
                <div class="col-md-5">
                    <input type="file" class="d-none file-input">
                    <div class="file-drop-area">
                        <div class="file-drop-default">
                            <i class="bi bi-cloud-arrow-up fs-1"></i>
                            <p class="file-drop-prompt mb-0" data-i18n="taskCardFileDrop">点击或拖拽文件到此处</p>
                        </div>
                        <div class="file-drop-selected" style="display: none;">
                            <i class="bi bi-check-circle-fill fs-1 text-success"></i>
                            <p class="mb-0 mt-2 fw-bold text-success" data-i18n="taskCardFileSelected">文件已选择</p>
                        </div>
                    </div>
                    <div class="file-name-display-wrapper mt-2" style="display: none;">
                        <span class="fw-bold" data-i18n="taskCardFilenameLabel">文件名: </span>
                        <span class="file-name-display text-success"></span>
                    </div>
                </div>
                <div class="col-md-7">
                    <h6><i class="bi bi-terminal me-2"></i><span data-i18n="taskCardLogLabel">日志</span></h6>
                    <div class="log-area"></div>
                    <div class="mt-2">
                        <div class="status-message-container">
                            <span class="status-message small text-muted"
                                  data-i18n="taskCardStatusWaiting">等待上传文件...</span>
                        </div>
                        <div class="progress mt-1" role="progressbar" style="height: 5px; display: none;">
                            <div class="progress-bar progress-bar-striped progress-bar-animated"
                                 style="width: 100%"></div>
                        </div>
                    </div>
                </div>
            </div>
        </div>
        <div class="card-footer d-flex justify-content-between align-items-center">
            <div class="download-buttons" style="display: none;">
                <button class="btn btn-sm btn-success preview-html-btn" style="display: none;"><i
                        class="bi bi-eye-fill me-1"></i><span data-i18n="taskCardPreviewBtn">预览</span>
                </button>
                <div class="btn-group">
                    <button type="button" class="btn btn-sm btn-secondary dropdown-toggle" data-bs-toggle="dropdown"
                            aria-expanded="false">
                        <i class="bi bi-download me-1"></i><span data-i18n="taskCardDownloadBtn">下载</span>
                    </button>
                    <ul class="dropdown-menu download-menu-container">
                        <!-- Populated by JavaScript -->
                    </ul>
                </div>
            </div>
            <button class="btn btn-primary start-translate-btn ms-auto"><i class="bi bi-play-fill me-1"></i><span
                    data-i18n="taskCardStartBtn">开始翻译</span>
            </button>
        </div>
    </div>
</template>

<!-- Reusable Download Menu Template -->
<template id="downloadMenuTemplate">
    <li class="download-item-md"><a class="dropdown-item" href="#"><i
            class="bi bi-markdown-fill me-2"></i><span data-i18n="downloadMdEmbedded">Markdown(嵌图)</span></a></li>
    <li class="download-item-md-zip"><a class="dropdown-item" href="#"><i
            class="bi bi-file-zip-fill me-2"></i><span data-i18n="downloadMdZip">Markdown压缩包</span></a></li>
    <li class="download-item-txt"><a class="dropdown-item" href="#"><i
            class="bi bi-filetype-txt me-2"></i>TXT</a></li>
    <li class="download-item-json"><a class="dropdown-item" href="#"><i
            class="bi bi-filetype-json me-2"></i>JSON</a></li>
    <li class="download-item-docx"><a class="dropdown-item" href="#"><i
            class="bi bi-filetype-docx me-2"></i>DOCX</a></li>
    <li class="download-item-xlsx"><a class="dropdown-item" href="#"><i
            class="bi bi-filetype-xlsx me-2"></i>XLSX</a></li>
    <li class="download-item-srt"><a class="dropdown-item" href="#"><i
            class="bi bi-filetype-srt me-2"></i>SRT</a></li>
    <li class="download-item-epub"><a class="dropdown-item" href="#"><i
            class="bi bi-book me-2"></i>EPUB</a></li>
    <li class="download-item-html"><a class="dropdown-item" href="#"><i
            class="bi bi-filetype-html me-2"></i>HTML</a></li>
    <li class="download-item-pdf"><a class="dropdown-item" href="#"><i
            class="bi bi-file-earmark-pdf-fill me-2"></i>PDF</a></li>
</template>


<!-- Preview Offcanvas with Resizable Panes -->
<div class="offcanvas offcanvas-end" data-bs-scroll="true" tabindex="-1" id="previewOffcanvas"
     aria-labelledby="previewOffcanvasLabel">
    <div class="offcanvas-header border-bottom">
        <h5 class="offcanvas-title" id="previewOffcanvasLabel" data-i18n="previewTitle">预览</h5>
        <div class="btn-group me-auto ms-4" role="group">
            <button type="button" class="btn btn-sm btn-primary" id="setBilingualViewBtn"
                    data-i18n="previewBilingualBtn">双语
            </button>
            <button type="button" class="btn btn-sm btn-outline-primary" id="setTranslatedOnlyViewBtn"
                    data-i18n="previewTranslatedOnlyBtn">仅译文
            </button>
        </div>
        <button type="button" class="btn-close" data-bs-dismiss="offcanvas" aria-label="Close"></button>
    </div>
    <div class="offcanvas-body d-flex flex-column p-2">
        <div class="preview-split-container flex-grow-1">
            <div id="originalPreviewContainer" class="preview-pane-wrapper">
                <h6 class="text-center text-muted small" data-i18n="previewOriginal">原文</h6>
                <div class="preview-pane" id="originalPreviewPane"></div>
            </div>
            <div id="translatedPreviewContainer" class="preview-pane-wrapper">
                <h6 class="text-center text-muted small" data-i18n="previewTranslated">译文</h6>
                <div class="preview-pane">
                    <iframe id="translatedPreviewFrame" src="about:blank"></iframe>
                </div>
            </div>
        </div>
        <div class="offcanvas-footer mt-2 pt-3 border-top d-flex justify-content-end align-items-center">
            <button type="button" class="btn btn-secondary" data-bs-dismiss="offcanvas" data-i18n="closeBtn">关闭
            </button>
            <div class="btn-group ms-2">
                <button type="button" class="btn btn-primary dropdown-toggle" data-bs-toggle="dropdown"
                        aria-expanded="false" id="previewDownloadBtn">
                    <i class="bi bi-download me-1"></i><span data-i18n="downloadBtn">下载</span>
                </button>
                <ul class="dropdown-menu dropdown-menu-end" id="previewDownloadMenu">
                    <!-- Populated by JavaScript -->
                </ul>
            </div>
        </div>
    </div>
</div>

<!-- Hidden iframe for direct PDF printing -->
<iframe id="printFrame" style="display: none;"></iframe>

<!-- Bottom Left Controls -->
<div class="bottom-left-controls">
    <!-- Language Switcher -->
    <div class="dropdown">
        <button class="btn btn-secondary dropdown-toggle" type="button" id="language-switcher" data-bs-toggle="dropdown"
                aria-expanded="false" title="切换语言 / Switch Language">
            <i class="bi bi-translate"></i>
        </button>
        <ul class="dropdown-menu" aria-labelledby="language-switcher" id="languageMenu">
            <li><a class="dropdown-item" href="#" data-lang="zh">中文</a></li>
            <li><a class="dropdown-item" href="#" data-lang="en">English</a></li>
        </ul>
    </div>

    <!-- Theme Switcher -->
    <div class="dropdown">
        <button class="btn btn-secondary dropdown-toggle" type="button" id="theme-switcher" data-bs-toggle="dropdown"
                aria-expanded="false">
            <i class="bi bi-circle-half"></i>
        </button>
        <ul class="dropdown-menu" aria-labelledby="theme-switcher">
            <li>
                <button class="dropdown-item" type="button" data-bs-theme-value="light"><i
                        class="bi bi-sun-fill me-2"></i>
                    Light
                </button>
            </li>
            <li>
                <button class="dropdown-item" type="button" data-bs-theme-value="dark"><i
                        class="bi bi-moon-stars-fill me-2"></i> Dark
                </button>
            </li>
            <li>
                <button class="dropdown-item active" type="button" data-bs-theme-value="auto"><i
                        class="bi bi-circle-half me-2"></i> Auto
                </button>
            </li>
        </ul>
    </div>
</div>


<!-- Tutorial Modal -->
<div class="modal fade" id="tutorialModal" tabindex="-1" aria-labelledby="tutorialModalLabel" aria-hidden="true">
    <div class="modal-dialog modal-lg modal-dialog-centered modal-dialog-scrollable">
        <div class="modal-content">
            <div class="modal-header">
                <h5 class="modal-title" id="tutorialModalLabel"><i class="bi bi-book-half me-2"></i><span
                        data-i18n="tutorialModalTitle">使用教程</span></h5>
                <button type="button" class="btn-close" data-bs-dismiss="modal" aria-label="Close"></button>
            </div>
            <div class="modal-body" data-i18n="tutorialModalBody">
                <p><i class="bi bi-camera-video me-2"></i>视频教程可以在B站搜索 <a
                        href="https://search.bilibili.com/all?keyword=docutranslate" target="_blank">docutranslate</a>
                    获取。</p>
                <p>欢迎使用 DocuTranslate！请按照以下步骤完成文档翻译：</p>
                <ol>
                    <li>
                        <strong><i class="bi bi-diagram-3 me-2"></i>选择工作流</strong>
                        <p class="mt-2">
                            首先，在配置面板顶部选择您需要的翻译流程。不同的工作流适用于不同类型的文件：
                        <ul>
                            <li><b>转Markdown再翻译</b>: 适用于翻译PDF、markdown、图片等文件。</li>
                            <li><b>纯文本翻译</b>: 用于翻译 <code>.txt</code> 等纯文本文件。</li>
                            <li><b>JSON翻译</b>: 用于翻译 <code>.json</code> 文件中的特定字段。</li>
                            <li><b>DOCX翻译</b>: 用于翻译 <code>.docx</code> 文件。</li>
                            <li><b>XLSX翻译</b>: 用于翻译 <code>.xlsx</code> 电子表格文件。</li>
                            <li><b>SRT字幕翻译</b>: 用于翻译 <code>.srt</code> 字幕文件。</li>
                            <li><b>EPUB翻译</b>: 用于翻译 <code>.epub</code> 电子书文件。</li>
                            <li><b>HTML翻译</b>: 用于翻译 <code>.html</code> 文件。</li>
                        </ul>
                        <div class="alert alert-info mt-2" role="alert">
                            <i class="bi bi-lightbulb-fill me-2"></i>新增功能:
                            "自动选择工作流"开关已默认开启。您只需上传文件，系统会自动为您匹配合适的工作流，简化操作。
                        </div>
                        </p>
                    </li>
                    <li>
                        <strong><i class="bi bi-gear-fill me-2"></i>配置参数</strong>
                        <p class="mt-2">根据您选择的工作流，完成相应的配置。所有配置项都会自动保存在您的浏览器中。</p>
                        <ul>
                            <li class="mb-2"><strong>解析配置</strong> (仅在“转Markdown再翻译”工作流下显示):
                                <ul class="mt-1">
                                    <li><strong>解析引擎</strong>:
                                        选择一个引擎将您的文件（如PDF）转换为适合翻译的Markdown格式。如果您的文件已经是Markdown格式，则无需选择。
                                    </li>
                                    <li><strong>Mineru Token</strong>: 如果您选择 <code>minerU</code> 引擎，需要在此处填入您的Token。
                                    </li>
                                </ul>
                            </li>
                            <li class="mb-2"><strong>DOCX/XLSX/SRT/EPUB/HTML翻译选项</strong> (在对应工作流下显示):
                                <ul class="mt-1">
                                    <li><strong>插入模式</strong>:
                                        定义翻译结果如何放入文档或字幕。您可以选择直接“替换”原文，或是在原文之后“附加”，或是在原文之前“前置”。
                                    </li>
                                    <li><strong>分隔符</strong>: 当选择“附加”或“前置”模式时，此项用于在原文和译文之间插入分隔符。
                                    </li>
                                </ul>
                            </li>
                            <li class="mb-2"><strong>JSON路径配置</strong> (仅在“JSON翻译”工作流下显示):
                                <ul class="mt-1">
                                    <li><strong>需要翻译的JSON路径</strong>: 每行输入一个 <a
                                            href="https://goessner.net/articles/JsonPath/" target="_blank">JSONPath</a>
                                        表达式，指定需要翻译的字段。
                                    </li>
                                    <li>例如:<code>$..description</code>翻译所有键为description的值。<code>$.items[0].name</code>翻译第一个item的name值。
                                    </li>
                                </ul>
                            </li>
                            <li class="mb-2"><strong>翻译模型</strong>:
                                <ul class="mt-1">
                                    <li><strong>选择平台/API 地址/API Key/模型 ID</strong>:
                                        配置您希望使用的AI翻译服务。
                                    </li>
                                    <li>模型ID参考平台文档，建议使用非推理模型或混合推理模型（关闭思考）。</li>
                                </ul>
                            </li>
                            <li class="mb-2"><strong>翻译配置</strong>:
                                <ul class="mt-1">
                                    <li><strong>目标语言/自定义Prompt</strong>: 指定翻译的目标语言和附加指令。</li>
                                    <li><strong>思考模式</strong>:设置混合推理模型是否进行思考，目前支持智谱的glm4.5系列、阿里云的qwen3系列、火山引擎的seed1.6系列，建议选择禁用思考。
                                    </li>
                                </ul>
                            </li>
                            <li class="mb-2"><strong>高级参数</strong>:
                                <ul class="mt-1">
                                    <li><strong>分块大小/并发数/Temperature</strong>: 发给ai的分块大小、并发请求数和温度，通常保持默认即可。
                                    </li>
                                </ul>
                            </li>
                        </ul>
                    </li>
                    <li>
                        <strong><i class="bi bi-file-earmark-arrow-up-fill me-2"></i>上传文件</strong>
                        <p class="mt-2">在右侧的任务列表中，点击或拖拽您的文档到文件上传区域。</p>
                    </li>
                    <li>
                        <strong><i class="bi bi-play-circle-fill me-2"></i>开始翻译</strong>
                        <p class="mt-2">文件选择成功后，点击任务卡片右下角的 <span
                                class="badge bg-primary">开始翻译</span> 按钮。系统将开始处理任务，您可以在日志区域查看实时进度。
                        </p>
                    </li>
                    <li>
                        <strong><i class="bi bi-check-circle-fill me-2"></i>查看与下载</strong>
                        <p class="mt-2">翻译完成后，任务卡片下方会出现操作按钮：</p>
                        <ul>
                            <li><span class="badge bg-success"><i class="bi bi-eye-fill me-1"></i>预览</span>:
                                在右侧滑出的面板中进行原文和译文的对照预览（仅作参考）。
                            </li>
                            <li><span class="badge bg-secondary"><i class="bi bi-download me-1"></i>下载</span>:
                                下载包括 PDF, DOCX, XLSX, HTML, Markdown 等多种格式的译文。
                            </li>
                        </ul>
                    </li>
                </ol>
                <div class="alert alert-info mt-3" role="alert">
                    <i class="bi bi-info-circle-fill me-2"></i><strong>提示</strong>: 所有配置都会自动保存在您的浏览器本地，方便下次使用。
                </div>
            </div>
            <div class="modal-footer">
                <button type="button" class="btn btn-primary" data-bs-dismiss="modal" data-i18n="tutorialUnderstandBtn">
                    我明白了
                </button>
            </div>
        </div>
    </div>
</div>
<!-- Contributors Modal -->
<div class="modal fade" id="contributorsModal" tabindex="-1" aria-labelledby="contributorsModalLabel"
     aria-hidden="true">
    <div class="modal-dialog modal-dialog-centered">
        <div class="modal-content">
            <div class="modal-header">
                <h5 class="modal-title" id="contributorsModalLabel"><i
                        class="bi bi-heart-fill me-2 text-danger"></i><span
                        data-i18n="contributorsModalTitle">感谢贡献</span>
                </h5>
                <button type="button" class="btn-close" data-bs-dismiss="modal" aria-label="Close"></button>
            </div>
            <div class="modal-body">
                <p data-i18n="contributorsPara1">DocuTranslate是一个开源项目！大家的需求与使用是项目进步的动力。</p>
                <p data-i18n="contributorsPara2">感谢所有资助项目、提交代码与宝贵建议及给项目star的朋友们！</p>
                <div class="alert alert-success mt-4" role="alert">
                    <p data-i18n="contributorsWelcome">欢迎通过以下方式参与贡献：</p>
                    <hr>
                    <p class="mb-0">
                        <a href="https://github.com/xunbu/docutranslate" target="_blank"
                           class="btn btn-info btn-sm ms-2">
                            <i class="bi bi-github me-1"></i><span data-i18n="contributorsGithub">github 主页</span>
                        </a>
                        <a href="https://github.com/xunbu/docutranslate/pulls" target="_blank"
                           class="btn btn-success btn-sm ms-2">
                            <i class="bi bi-git me-1"></i><span data-i18n="contributorsPR">提交 Pull Request</span>
                        </a>
                        <a href="https://github.com/xunbu/docutranslate/issues" target="_blank"
                           class="btn btn-warning btn-sm ms-2">
                            <i class="bi bi-bug-fill me-1"></i><span data-i18n="contributorsIssue">报告 Issue</span>
                        </a>
                    </p>
                    <hr>
                    <p data-i18n="contributorsQQ">或者通过QQ群联系作者：<span>1047781902</span></p>
                </div>
            </div>
            <div class="modal-footer">
                <button type="button" class="btn btn-secondary" data-bs-dismiss="modal" data-i18n="closeBtn">关闭
                </button>
            </div>
        </div>
    </div>
</div>

<!-- Bootstrap JS -->
<script src="/static/bootstrap.bundle.min.js" crossorigin="anonymous"></script>
<!-- Split.js for resizable panes -->
<script src="/static/split.min.js"></script>

<script type="module">
    // --- I18N Data ---
    // Initialize with a minimal fallback for critical error messages.
    // The full dataset will be loaded asynchronously in the init() function.
    let i18nData = {
        zh: {
            init_i18n_failed_alert: '加载界面翻译资源失败，请检查网络连接或联系管理员。',
            init_failed_alert: '初始化失败，无法连接到后端服务。请检查服务是否运行或刷新页面。'
        },
        en: {
            init_i18n_failed_alert: 'Failed to load interface translations. Please check your network connection or contact an administrator.',
            init_failed_alert: 'Initialization failed, could not connect to the backend service. Please ensure the service is running and refresh the page.'
        }
    };

    let currentLang = 'zh'; // Global language state

    // --- I18N Helper Functions ---
    const getText = (key, fallback = '') => {
        const translations = i18nData[currentLang] || i18nData.zh;
        return translations[key] || fallback || key;
    };

    function setLanguage(lang) {
        if (!i18nData[lang]) return;
        currentLang = lang;
        const translations = i18nData[lang];
        document.documentElement.lang = lang === 'zh' ? 'zh-CN' : 'en';

        // 1. Update all static elements with data-i18n attribute
        document.querySelectorAll('[data-i18n]').forEach(el => {
            const key = el.dataset.i18n;
            if (translations[key] !== undefined) {
                el.innerHTML = translations[key];
            }
        });

        // 2. Update all placeholder attributes
        document.querySelectorAll('[data-i18n-placeholder]').forEach(el => {
            const key = el.dataset.i18nPlaceholder;
            if (translations[key] !== undefined) {
                el.placeholder = translations[key];
            }
        });

        // 3. Update all title attributes (for tooltips and page title)
        document.querySelectorAll('[data-i18n-title]').forEach(el => {
            const key = el.dataset.i18nTitle;
            if (translations[key] !== undefined) {
                if (el.tagName === 'TITLE') {
                    el.textContent = translations[key];
                } else {
                    el.title = translations[key];
                    const tooltipInstance = bootstrap.Tooltip.getInstance(el);
                    if (tooltipInstance) {
                        tooltipInstance.setContent({'.tooltip-inner': translations[key]});
                    }
                }
            }
        });

        // 4. Update dynamic UI parts that are built with JS
        updateWorkflowUI();
        updateConvertEnginUI(true);

        // 5. Update language switcher active state
        const langMenu = document.getElementById('languageMenu');
        langMenu.querySelectorAll('a.active').forEach(a => a.classList.remove('active'));
        const activeLink = langMenu.querySelector(`a[data-lang="${lang}"]`);
        if (activeLink) activeLink.classList.add('active');

        // 6. Save preference
        saveToStorage('ui_language', lang);
    }

    function initI18n() {
        const langMenu = document.getElementById('languageMenu');
        langMenu.querySelectorAll('a[data-lang]').forEach(a => {
            a.addEventListener('click', (e) => {
                e.preventDefault();
                setLanguage(a.dataset.lang);
            });
        });

        const savedLang = getFromStorage('ui_language') || (navigator.language.toLowerCase().startsWith('en') ? 'en' : 'zh');
        setLanguage(savedLang);
    }

    // --- End I18N ---

    const tooltipTriggerList = document.querySelectorAll('[data-bs-toggle="tooltip"]');
    const tooltipList = [...tooltipTriggerList].map(tooltipTriggerEl => new bootstrap.Tooltip(tooltipTriggerEl));

    // --- DOM Elements ---
    const settingsForm = document.getElementById('translateForm');

    // Workflow elements
    const workflowTypeSelect = document.getElementById('workflowTypeSelect');
    const autoWorkflowSwitch = document.getElementById('autoWorkflowSwitch');
    const parsingSettingsContainer = document.getElementById('parsingSettingsContainer');
    const parsingSettingsTitle = document.getElementById('parsingSettingsTitle');
    const jsonSettingsContainer = document.getElementById('jsonSettingsContainer');
    const jsonSettingsTitle = document.getElementById('jsonSettingsTitle');
    const jsonPathsTextarea = document.getElementById('json_paths_textarea');
    const xlsxSettingsContainer = document.getElementById('xlsxSettingsContainer');
    const xlsxSettingsTitle = document.getElementById('xlsxSettingsTitle');
    const xlsxInsertModeSelect = document.getElementById('xlsx_insert_mode');
    const xlsxSeparatorGroup = document.getElementById('xlsxSeparatorGroup');
    const xlsxSeparatorInput = document.getElementById('xlsx_separator');
    const docxSettingsContainer = document.getElementById('docxSettingsContainer');
    const docxSettingsTitle = document.getElementById('docxSettingsTitle');
    const docxInsertModeSelect = document.getElementById('docx_insert_mode');
    const docxSeparatorGroup = document.getElementById('docxSeparatorGroup');
    const docxSeparatorInput = document.getElementById('docx_separator');
    const srtSettingsContainer = document.getElementById('srtSettingsContainer');
    const srtSettingsTitle = document.getElementById('srtSettingsTitle');
    const srtInsertModeSelect = document.getElementById('srt_insert_mode');
    const srtSeparatorGroup = document.getElementById('srtSeparatorGroup');
    const srtSeparatorInput = document.getElementById('srt_separator');
    const epubSettingsContainer = document.getElementById('epubSettingsContainer');
    const epubSettingsTitle = document.getElementById('epubSettingsTitle');
    const epubInsertModeSelect = document.getElementById('epub_insert_mode');
    const epubSeparatorGroup = document.getElementById('epubSeparatorGroup');
    const epubSeparatorInput = document.getElementById('epub_separator');
    const htmlSettingsContainer = document.getElementById('htmlSettingsContainer');
    const htmlSettingsTitle = document.getElementById('htmlSettingsTitle');
    const htmlInsertModeSelect = document.getElementById('html_insert_mode');
    const htmlSeparatorGroup = document.getElementById('htmlSeparatorGroup');
    const htmlSeparatorInput = document.getElementById('html_separator');
    const aiSettingsTitle = document.getElementById('aiSettingsTitle');
    const translationSettingsTitle = document.getElementById('translationSettingsTitle');
    const advancedSettingsTitle = document.getElementById('advancedSettingsTitle');


    // Parsing elements
    const convertEnginSelect = document.getElementById('convert_engine');
    const mineruTokenGroup = document.getElementById('mineruTokenGroup');
    const mineruTokenInput = document.getElementById('mineru_token');
    const mineruModelVersionGroup = document.getElementById('mineruModelVersionGroup');
    const modelVersionSelect = document.getElementById('model_version');
    const formulaCheckbox = document.getElementById('formula_ocr');
    const codeCheckbox = document.getElementById('code_ocr');
    const codeOcrSwitch = document.getElementById('codeOcrSwitch');

    // AI elements
    const platformSelect = document.getElementById('platform_select');
    const apiHref = document.getElementById('api_href');
    const baseUrlGroup = document.getElementById('baseUrlGroup');
    const baseUrlInput = document.getElementById('base_url');
    const apikeyInput = document.getElementById('api_key');
    const modelInput = document.getElementById('model_id');

    // Translation elements
    const toLangSelect = document.getElementById('to_lang');
    const customLangGroup = document.getElementById('customLangGroup');
    const customLangInput = document.getElementById('custom_to_lang');
    const customPromptTranslateArea = document.getElementById("custom_prompt");

    // Advanced elements
    const chunkSizeSlider = document.getElementById('chunk-size-slider');
    const chunkSizeDisplay = document.getElementById('chunk-size-display');
    const chunkSizeReset = document.getElementById('chunk-size-reset');
    const concurrentSlider = document.getElementById('concurrent-slider');
    const concurrentDisplay = document.getElementById('concurrent-display');
    const concurrentReset = document.getElementById("concurrent-reset");
    const temperatureSlider = document.getElementById('temperature-slider');
    const temperatureDisplay = document.getElementById('temperature-display');
    const temperatureReset = document.getElementById("temperature-reset");

    // General UI elements
    const versionDisplay = document.getElementById("versionDisplay");
    const addNewTaskBtn = document.getElementById('addNewTaskBtn');
    const taskContainer = document.getElementById('task-container');
    const noTaskPlaceholder = document.getElementById('no-task-placeholder');
    const taskCardTemplate = document.getElementById('taskCardTemplate');
    const downloadMenuTemplate = document.getElementById('downloadMenuTemplate');
    const previewOffcanvasEl = document.getElementById('previewOffcanvas');
    const previewOffcanvas = new bootstrap.Offcanvas(previewOffcanvasEl);
    const previewOffcanvasLabel = document.getElementById('previewOffcanvasLabel');
    const originalPreviewPane = document.getElementById('originalPreviewPane');
    const translatedPreviewFrame = document.getElementById('translatedPreviewFrame');
    const originalPreviewContainer = document.getElementById('originalPreviewContainer');
    const translatedPreviewContainer = document.getElementById('translatedPreviewContainer');
    const setBilingualViewBtn = document.getElementById('setBilingualViewBtn');
    const setTranslatedOnlyViewBtn = document.getElementById('setTranslatedOnlyViewBtn');
    const printFrameEl = document.getElementById('printFrame');

    // --- Global State ---
    let defaultParams = {};
    const tasks = {}; // { cardId: { elements: {...}, state: {...}, intervals: {...} } }
    let isAdminMode = false;
    let previewSplitInstance = null;

    const apiHrefMap = {
        "https://openrouter.ai/api/v1": "https://openrouter.ai/settings/keys",
        "https://api.openai.com/v1": "https://platform.openai.com/api-keys",
        "https://api.deepseek.com/v1": "https://platform.deepseek.com/api_keys",
        "https://open.bigmodel.cn/api/paas/v4": "https://open.bigmodel.cn/usercenter/apikeys",
        "https://dashscope.aliyuncs.com/compatible-mode/v1": "https://bailian.console.aliyun.com/?tab=model#/api-key",
        "https://ark.cn-beijing.volces.com/api/v3": "https://console.volcengine.com/ark/region:ark+cn-beijing/apiKey?apikey=%7B%7D",
        "https://api.siliconflow.cn/v1": "https://cloud.siliconflow.cn/account/ak",
        "https://www.dmxapi.cn/v1": "https://www.dmxapi.cn/token",
        "https://generativelanguage.googleapis.com/v1beta/openai/": "https://aistudio.google.com/u/0/apikey"
    };

    const workflowExtensionMap = {
        'txt': 'txt',
        'xlsx': 'xlsx',
        'docx': 'docx',
        'json': 'json',
        'srt': 'srt',
        'epub': 'epub',
        'html': 'html',
        'htm': 'html',
    };
    const defaultAutoWorkflow = 'markdown_based';

    // --- Utility Functions ---
    const generateCardId = () => `card_${Math.random().toString(36).substring(2, 10)}`;
    const saveToStorage = (key, value) => {
        try {
            localStorage.setItem(key, value);
        } catch (e) {
            console.warn("Save to storage failed:", e);
        }
    };
    const getFromStorage = (key, defaultValue = '') => {
        try {
            return localStorage.getItem(key) || defaultValue;
        } catch (e) {
            console.warn("Read from storage failed:", e);
            return defaultValue;
        }
    };

    function fileToBase64(file) {
        return new Promise((resolve, reject) => {
            const reader = new FileReader();
            reader.readAsDataURL(file);
            reader.onload = () => {
                const base64String = reader.result.split(',')[1];
                resolve(base64String);
            };
            reader.onerror = error => reject(error);
        });
    }

    // --- UI Update Functions based on Workflow ---
    function updateWorkflowUI() {
        const selectedWorkflow = workflowTypeSelect.value;
        const translations = i18nData[currentLang] || i18nData.zh;

        // Hide all workflow-specific containers first
        parsingSettingsContainer.style.display = 'none';
        jsonSettingsContainer.style.display = 'none';
        xlsxSettingsContainer.style.display = 'none';
        docxSettingsContainer.style.display = 'none';
        srtSettingsContainer.style.display = 'none';
        epubSettingsContainer.style.display = 'none';
        htmlSettingsContainer.style.display = 'none';

        // Default numbering
        let currentStep = 2;
        const getStep = () => currentStep++;

        // Update main workflow title (it's static)
        document.querySelector('#headingZero button strong').innerHTML = `<i class="bi bi-diagram-3 me-2"></i>${translations.workflowTitle}`;

        switch (selectedWorkflow) {
            case 'markdown_based':
                parsingSettingsContainer.style.display = 'block';
                parsingSettingsTitle.innerHTML = `<i class="bi bi-file-earmark-binary me-2"></i>${getStep()}. ${translations.parsingSettingsTitleText}`;
                break;
            case 'txt':
                // No specific panel, just re-number
                break;
            case 'json':
                jsonSettingsContainer.style.display = 'block';
                jsonSettingsTitle.innerHTML = `<i class="bi bi-signpost-split me-2"></i>${getStep()}. ${translations.jsonSettingsTitleText}`;
                break;
            case 'xlsx':
                xlsxSettingsContainer.style.display = 'block';
                xlsxSettingsTitle.innerHTML = `<i class="bi bi-file-earmark-spreadsheet me-2"></i>${getStep()}. ${translations.xlsxSettingsTitleText}`;
                updateSeparatorVisibility(xlsxInsertModeSelect, xlsxSeparatorGroup);
                break;
            case 'docx':
                docxSettingsContainer.style.display = 'block';
                docxSettingsTitle.innerHTML = `<i class="bi bi-file-earmark-word me-2"></i>${getStep()}. ${translations.docxSettingsTitleText}`;
                updateSeparatorVisibility(docxInsertModeSelect, docxSeparatorGroup);
                break;
            case 'srt':
                srtSettingsContainer.style.display = 'block';
                srtSettingsTitle.innerHTML = `<i class="bi bi-file-text me-2"></i>${getStep()}. ${translations.srtSettingsTitleText}`;
                updateSeparatorVisibility(srtInsertModeSelect, srtSeparatorGroup);
                break;
            case 'epub':
                epubSettingsContainer.style.display = 'block';
                epubSettingsTitle.innerHTML = `<i class="bi bi-book me-2"></i>${getStep()}. ${translations.epubSettingsTitleText}`;
                updateSeparatorVisibility(epubInsertModeSelect, epubSeparatorGroup);
                break;
            case 'html':
                htmlSettingsContainer.style.display = 'block';
                htmlSettingsTitle.innerHTML = `<i class="bi bi-filetype-html me-2"></i>${getStep()}. ${translations.htmlSettingsTitleText}`;
                updateSeparatorVisibility(htmlInsertModeSelect, htmlSeparatorGroup);
                break;
        }

        // Renumber common sections
        aiSettingsTitle.innerHTML = `<i class="bi bi-robot me-2"></i>${getStep()}. ${translations.aiSettingsTitleText}`;
        translationSettingsTitle.innerHTML = `<i class="bi bi-translate me-2"></i>${getStep()}. ${translations.translationSettingsTitleText}`;
        advancedSettingsTitle.innerHTML = `<i class="bi bi-sliders me-2"></i>${getStep()}. ${translations.advancedSettingsTitleText}`;

        saveToStorage('translator_last_workflow', selectedWorkflow);
    }

    function updateSeparatorVisibility(modeSelect, separatorGroup) {
        const selectedMode = modeSelect.value;
        if (selectedMode === 'append' || selectedMode === 'prepend') {
            separatorGroup.style.display = 'block';
        } else {
            separatorGroup.style.display = 'none';
        }
    }

    function updateCustomLangUI() {
        const isCustom = toLangSelect.value === 'custom';
        customLangGroup.style.display = isCustom ? 'block' : 'none';
        customLangInput.required = isCustom;
    }

    // --- Other UI Update Functions ---
    function updatePlatformUI() {
        const selectedPlatformValue = platformSelect.value;
        apikeyInput.value = getFromStorage(`translator_platform_${selectedPlatformValue}_apikey`);
        modelInput.value = getFromStorage(`translator_platform_${selectedPlatformValue}_model_id`);
        if (selectedPlatformValue === 'custom') {
            baseUrlGroup.classList.remove('d-none');
            baseUrlInput.required = true;
            baseUrlInput.value = getFromStorage('translator_platform_custom_base_url');
            apiHref.classList.add('d-none');
        } else {
            baseUrlGroup.classList.add('d-none');
            baseUrlInput.required = false;
            baseUrlInput.value = selectedPlatformValue;
            if (apiHrefMap[baseUrlInput.value]) {
                apiHref.href = apiHrefMap[baseUrlInput.value];
                apiHref.classList.remove('d-none');
            } else {
                apiHref.classList.add('d-none');
            }
        }
        saveToStorage('translator_last_platform', selectedPlatformValue);
    }

    function updateConvertEnginUI(isLanguageChange = false) {
        if (!isLanguageChange) {
            const selectedEngin = convertEnginSelect.value;
            mineruTokenGroup.style.display = selectedEngin === 'mineru' ? 'block' : 'none';
            mineruModelVersionGroup.style.display = selectedEngin === 'mineru' ? 'block' : 'none';
            mineruTokenInput.required = selectedEngin === 'mineru';
            codeOcrSwitch.style.display = selectedEngin === 'docling' ? 'block' : 'none';

            if (selectedEngin === 'mineru') {
                mineruTokenInput.value = getFromStorage('translator_mineru_token');
            }
            saveToStorage('translator_convert_engin', selectedEngin);
        } else {
            // Repopulate options with translated text
            const savedValue = convertEnginSelect.value;
            const enginOptions = convertEnginSelect.querySelectorAll('option');
            enginOptions.forEach(option => {
                let textKey;
                switch (option.value) {
                    case 'identity':
                        textKey = 'engineOptionIdentity';
                        break;
                    case 'mineru':
                        textKey = 'engineOptionMineru';
                        break;
                    case 'docling':
                        textKey = 'engineOptionDocling';
                        break;
                    default:
                        textKey = option.value;
                }
                option.textContent = getText(textKey, option.value);
            });
            convertEnginSelect.value = savedValue;
        }
    }

    function createSliderUpdater(slider, display, resetBtn, key, params) {
        return () => {
            const value = slider.value;
            display.textContent = value;
            resetBtn.style.visibility = value !== String(params[key]) ? 'visible' : 'hidden';
            saveToStorage(key, value);
        };
    }

    function setupSlider(slider, display, resetBtn, key, params) {
        slider.value = getFromStorage(key, params[key]);
        const updater = createSliderUpdater(slider, display, resetBtn, key, params);
        slider.addEventListener('input', updater);
        resetBtn.addEventListener('click', () => {
            slider.value = params[key];
            updater();
        });
        updater(); // Initial call
    }

    function updateTaskPlaceholderVisibility() {
        noTaskPlaceholder.style.display = Object.keys(tasks).length === 0 ? 'block' : 'none';
    }

    function saveTaskIds() {
        if (isAdminMode) return;
        const submittedTaskIds = Object.values(tasks)
            .map(task => task.state.backendTaskId)
            .filter(id => id);
        saveToStorage('active_task_ids', JSON.stringify(submittedTaskIds));
    }

    // --- Task Card Management ---
    function createTaskCard(backendTaskId = null, restoreState = false) {
        const cardId = backendTaskId || generateCardId();
        if (tasks[cardId]) return; // Avoid duplicate cards

        const cardFragment = taskCardTemplate.content.cloneNode(true);
        const cardElement = cardFragment.querySelector('.task-card');
        cardElement.dataset.cardId = cardId;

        // Translate the new card immediately
        const translations = i18nData[currentLang] || i18nData.zh;
        cardElement.querySelectorAll('[data-i18n]').forEach(el => el.innerHTML = translations[el.dataset.i18n] || el.innerHTML);
        cardElement.querySelectorAll('[data-i18n-placeholder]').forEach(el => el.placeholder = translations[el.dataset.i18nPlaceholder] || el.placeholder);


        const elements = {
            card: cardElement,
            taskIdDisplay: cardElement.querySelector('.task-id-display'),
            removeBtn: cardElement.querySelector('.remove-task-btn'),
            fileInput: cardElement.querySelector('.file-input'),
            fileDropArea: cardElement.querySelector('.file-drop-area'),
            fileDropDefault: cardElement.querySelector('.file-drop-default'),
            fileDropSelected: cardElement.querySelector('.file-drop-selected'),
            fileNameDisplayWrapper: cardElement.querySelector('.file-name-display-wrapper'),
            fileNameDisplay: cardElement.querySelector('.file-name-display'),
            logArea: cardElement.querySelector('.log-area'),
            statusMessage: cardElement.querySelector('.status-message'),
            progress: cardElement.querySelector('.progress'),
            downloadButtons: cardElement.querySelector('.download-buttons'),
            downloadMenuContainer: cardElement.querySelector('.download-menu-container'),
            previewBtn: cardElement.querySelector('.preview-html-btn'),
            startBtn: cardElement.querySelector('.start-translate-btn'),
        };

        if (restoreState && backendTaskId) {
            elements.taskIdDisplay.innerHTML = `<code>${backendTaskId}</code>`;
        }

        tasks[cardId] = {
            elements,
            state: {
                backendTaskId: backendTaskId,
                isTranslating: false,
                file: null,
                htmlUrl: null,
                fileNameStem: null,
                isSubmitted: restoreState,
                downloads: {},
                workflow: null
            },
            intervals: {
                log: null,
                status: null
            }
        };

        addEventListenersToCard(cardId);

        taskContainer.prepend(cardElement);
        updateTaskPlaceholderVisibility();

        if (restoreState && backendTaskId) {
            pollStatus(backendTaskId, true);
        }
    }

    async function releaseTask(backendTaskId) {
        try {
            await fetch(`/service/release/${backendTaskId}`, {method: 'POST'});
            console.log(`[${backendTaskId}] Release request sent to backend.`);
        } catch (error) {
            console.error(`[${backendTaskId}] Failed to send release request:`, error);
        }
    }

    async function removeTask(cardId) {
        const task = tasks[cardId];
        if (!task) return;

        const backendTaskId = task.state.backendTaskId;
        if (backendTaskId) {
            stopPolling(backendTaskId);
            await releaseTask(backendTaskId);
        }

        task.elements.card.remove();
        delete tasks[cardId];

        saveTaskIds();
        updateTaskPlaceholderVisibility();
    }

    function addEventListenersToCard(cardId) {
        const {elements} = tasks[cardId];

        elements.card.addEventListener('click', () => {
            const task = tasks[cardId];
            if (task && task.state.workflow) {
                workflowTypeSelect.value = task.state.workflow;
                updateWorkflowUI();
            }
        });

        elements.removeBtn.addEventListener('click', () => removeTask(cardId));

        elements.fileDropArea.addEventListener('click', () => elements.fileInput.click());
        elements.fileInput.addEventListener('change', () => handleFileSelect(cardId));
        ['dragenter', 'dragover', 'dragleave', 'drop'].forEach(eventName => {
            elements.fileDropArea.addEventListener(eventName, e => {
                e.preventDefault();
                e.stopPropagation();
            }, false);
        });
        ['dragenter', 'dragover'].forEach(eventName => {
            elements.fileDropArea.addEventListener(eventName, () => elements.fileDropArea.classList.add('drag-over'), false);
        });
        ['dragleave', 'drop'].forEach(eventName => {
            elements.fileDropArea.addEventListener(eventName, () => elements.fileDropArea.classList.remove('drag-over'), false);
        });
        elements.fileDropArea.addEventListener('drop', e => {
            if (e.dataTransfer.files.length > 0) {
                elements.fileInput.files = e.dataTransfer.files;
                handleFileSelect(cardId);
            }
        }, false);

        elements.startBtn.addEventListener('click', () => {
            if (tasks[cardId].state.isTranslating) {
                cancelTranslation(cardId);
            } else {
                startTranslation(cardId);
            }
        });
    }

    function handleFileSelect(cardId) {
        const {elements, state} = tasks[cardId];
        const file = elements.fileInput.files[0];
        if (file) {
            state.file = file;
            elements.fileNameDisplay.textContent = file.name;
            elements.fileNameDisplayWrapper.style.display = 'block';
            elements.fileDropArea.classList.add('file-selected');
            elements.fileDropDefault.style.display = 'none';
            elements.fileDropSelected.style.display = 'block';
            elements.fileDropArea.classList.remove('input-error');
            elements.fileNameDisplay.classList.remove('input-error-text');

            if (autoWorkflowSwitch.checked) {
                const fileExtension = file.name.split('.').pop().toLowerCase();
                const targetWorkflow = workflowExtensionMap[fileExtension] || defaultAutoWorkflow;
                workflowTypeSelect.value = targetWorkflow;
                updateWorkflowUI();
            }
        }
    }

    // --- Core Translation Logic ---
    async function startTranslation(cardId) {
        const {elements, state} = tasks[cardId];

        // --- File and common settings validation ---
        if (!state.file) {
            elements.statusMessage.textContent = getText('status_selectFileFirst');
            elements.statusMessage.className = 'status-message small text-danger';
            elements.fileDropArea.classList.add('input-error');
            return;
        }
        const requiredCommonInputs = [apikeyInput, modelInput];
        if (platformSelect.value === 'custom') requiredCommonInputs.push(baseUrlInput);

        let isValid = true;
        requiredCommonInputs.forEach(input => {
            input.classList.remove('is-invalid');
            if (!input.value.trim()) {
                input.classList.add('is-invalid');
                isValid = false;
            }
        });

        if (toLangSelect.value === 'custom') {
            customLangInput.classList.remove('is-invalid');
            if (!customLangInput.value.trim()) {
                customLangInput.classList.add('is-invalid');
                isValid = false;
            }
        }

        // --- Workflow-specific validation and payload building ---
        const workflowType = workflowTypeSelect.value;
        state.workflow = workflowType;
        let workflowPayload = {};

        let targetLanguage = toLangSelect.value;
        if (targetLanguage === 'custom') {
            targetLanguage = customLangInput.value.trim();
        }

        const basePayload = {
            base_url: baseUrlInput.value,
            api_key: apikeyInput.value,
            model_id: modelInput.value,
            to_lang: targetLanguage,
            thinking: document.querySelector('input[name="thinking"]:checked')?.value || 'disable',
            chunk_size: parseInt(chunkSizeSlider.value, 10),
            concurrent: parseInt(concurrentSlider.value, 10),
            temperature: parseFloat(temperatureSlider.value),
            custom_prompt: customPromptTranslateArea.value || null,
        };

        switch (workflowType) {
            case 'markdown_based':
                if (convertEnginSelect.value === 'mineru' && !mineruTokenInput.value.trim()) {
                    mineruTokenInput.classList.add('is-invalid');
                    isValid = false;
                } else {
                    mineruTokenInput.classList.remove('is-invalid');
                }
                workflowPayload = {
                    ...basePayload,
                    workflow_type: 'markdown_based',
                    convert_engine: convertEnginSelect.value || null,
                    mineru_token: mineruTokenInput.value || null,
                    formula_ocr: formulaCheckbox.checked,
                    code_ocr: codeCheckbox.checked,
                    model_version: modelVersionSelect.value,
                };
                break;
            case 'txt':
                workflowPayload = {
                    ...basePayload,
                    workflow_type: 'txt'
                };
                break;
            case 'json':
                const jsonPaths = jsonPathsTextarea.value.trim().split('\n').map(p => p.trim()).filter(p => p);
                if (jsonPaths.length === 0) {
                    jsonPathsTextarea.classList.add('is-invalid');
                    isValid = false;
                } else {
                    jsonPathsTextarea.classList.remove('is-invalid');
                }
                workflowPayload = {
                    ...basePayload,
                    workflow_type: 'json',
                    json_paths: jsonPaths,
                };
                break;
            case 'xlsx':
                workflowPayload = {
                    ...basePayload,
                    workflow_type: 'xlsx',
                    insert_mode: xlsxInsertModeSelect.value,
                    separator: xlsxSeparatorInput.value.replace(/\\n/g, '\n')
                };
                break;
            case 'docx':
                workflowPayload = {
                    ...basePayload,
                    workflow_type: 'docx',
                    insert_mode: docxInsertModeSelect.value,
                    separator: docxSeparatorInput.value.replace(/\\n/g, '\n')
                };
                break;
            case 'srt':
                workflowPayload = {
                    ...basePayload,
                    workflow_type: 'srt',
                    insert_mode: srtInsertModeSelect.value,
                    separator: srtSeparatorInput.value.replace(/\\n/g, '\n')
                };
                break;
            case 'epub':
                workflowPayload = {
                    ...basePayload,
                    workflow_type: 'epub',
                    insert_mode: epubInsertModeSelect.value,
                    separator: epubSeparatorInput.value.replace(/\\n/g, '\n')
                };
                break;
            case 'html':
                workflowPayload = {
                    ...basePayload,
                    workflow_type: 'html',
                    insert_mode: htmlInsertModeSelect.value,
                    separator: htmlSeparatorInput.value.replace(/\\n/g, '\n')
                };
                break;
            default:
                elements.statusMessage.textContent = getText('status_invalidWorkflow');
                elements.statusMessage.className = 'status-message small text-danger';
                return;
        }

        if (!isValid) {
            elements.statusMessage.textContent = getText('status_fillRequired');
            elements.statusMessage.className = 'status-message small text-danger';
            return;
        }

        // --- Release old task and start new one ---
        const oldBackendTaskId = state.backendTaskId;
        if (oldBackendTaskId) {
            console.log(`[${oldBackendTaskId}] ${getText('status_releasingOldTask')}`);
            await releaseTask(oldBackendTaskId);
            state.backendTaskId = null;
        }

        state.isTranslating = true;
        elements.startBtn.disabled = true;
        elements.startBtn.innerHTML = `<span class="spinner-border spinner-border-sm" role="status" aria-hidden="true"></span> <span data-i18n="btn_initializing">${getText('btn_initializing')}</span>`;
        elements.logArea.innerHTML = '';
        elements.statusMessage.textContent = getText('status_encodingAndSubmitting');
        elements.statusMessage.className = 'status-message small text-muted';
        elements.downloadButtons.style.display = 'none';
        elements.progress.style.display = 'block';

        try {
            const fileContentBase64 = await fileToBase64(state.file);
            const finalRequest = {
                file_name: state.file.name,
                file_content: fileContentBase64,
                payload: workflowPayload
            };

            const response = await fetch('/service/translate', {
                method: 'POST',
                headers: {'Content-Type': 'application/json'},
                body: JSON.stringify(finalRequest)
            });
            const result = await response.json();

            if (response.ok && result.task_started) {
                const backendTaskId = result.task_id;
                state.backendTaskId = backendTaskId;
                state.isSubmitted = true;
                elements.taskIdDisplay.innerHTML = `<code>${backendTaskId}</code>`;
                elements.taskIdDisplay.classList.remove('task-id-placeholder');

                saveTaskIds();

                elements.statusMessage.textContent = result.message || getText('status_requestOk');
                elements.statusMessage.className = 'status-message small text-info';
                elements.startBtn.innerHTML = `<i class="bi bi-stop-circle-fill me-1"></i><span data-i18n="btn_cancelTranslation">${getText('btn_cancelTranslation')}</span>`;
                elements.startBtn.classList.replace('btn-primary', 'btn-danger');
                elements.startBtn.disabled = false;

                startPolling(backendTaskId);
            } else {
                let errorMessage = result.detail || result.message || `${getText('status_requestFail')} (${response.status})`;
                if (typeof errorMessage === 'object') {
                    errorMessage = JSON.stringify(errorMessage);
                }
                throw new Error(errorMessage);
            }
        } catch (error) {
            state.isSubmitted = false;
            console.error('Request failed:', error);
            elements.statusMessage.textContent = `${getText('status_initFail')}: ${error.message}`;
            elements.statusMessage.className = 'status-message small text-danger';
            elements.startBtn.innerHTML = `<i class="bi bi-play-fill me-1"></i><span data-i18n="taskCardStartBtn">${getText('taskCardStartBtn')}</span>`;
            elements.startBtn.classList.replace('btn-danger', 'btn-primary');
            elements.startBtn.disabled = false;
            elements.progress.style.display = 'none';
            state.isTranslating = false;
        }
    }

    async function cancelTranslation(cardId) {
        const task = tasks[cardId];
        if (!task || !task.state.backendTaskId) return;

        const {elements} = task;
        const backendTaskId = task.state.backendTaskId;

        elements.startBtn.disabled = true;
        elements.startBtn.innerHTML = `<span class="spinner-border spinner-border-sm" role="status" aria-hidden="true"></span> <span data-i18n="status_cancelling">${getText('status_cancelling')}</span>`;

        try {
            const response = await fetch(`/service/cancel/${backendTaskId}`, {method: 'POST'});
            const result = await response.json();

            if (response.ok && result.cancelled) {
                elements.statusMessage.textContent = result.message || getText('status_cancelSent');
                elements.statusMessage.className = 'status-message small text-warning';
            } else {
                throw new Error(result.message || getText('status_cancelFail'));
            }
        } catch (error) {
            elements.statusMessage.textContent = `${getText('status_cancelFail')}: ${error.message}`;
            elements.statusMessage.className = 'status-message small text-danger';
            elements.startBtn.disabled = false;
            elements.startBtn.innerHTML = `<i class="bi bi-stop-circle-fill me-1"></i><span data-i18n="btn_cancelTranslation">${getText('btn_cancelTranslation')}</span>`;
        }
    }

    // --- Polling ---
    function startPolling(backendTaskId) {
        stopPolling(backendTaskId);
        const card = Object.values(tasks).find(t => t.state.backendTaskId === backendTaskId);
        if (!card) return;

        card.intervals.log = setInterval(() => pollLogs(backendTaskId), 2000);
        card.intervals.status = setInterval(() => pollStatus(backendTaskId), 1500);
        pollLogs(backendTaskId);
        pollStatus(backendTaskId);
    }

    function stopPolling(backendTaskId) {
        const card = Object.values(tasks).find(t => t.state.backendTaskId === backendTaskId);
        if (!card) return;

        const {intervals} = card;
        if (intervals.log) clearInterval(intervals.log);
        if (intervals.status) clearInterval(intervals.status);
        intervals.log = null;
        intervals.status = null;
    }

    async function pollLogs(backendTaskId) {
        const card = Object.values(tasks).find(t => t.state.backendTaskId === backendTaskId);
        if (!card) return;
        const {elements} = card;

        try {
            const response = await fetch(`/service/logs/${backendTaskId}`);
            if (!response.ok) return;
            const data = await response.json();
            if (data.logs && data.logs.length > 0) {
                elements.logArea.innerHTML += data.logs.map(log => log.replace(/</g, "<").replace(/>/g, ">") + '<br>').join('');
                elements.logArea.scrollTop = elements.logArea.scrollHeight;
            }
        } catch (error) {
            console.warn(`[${backendTaskId}] Error polling logs:`, error);
        }
    }

    async function pollStatus(backendTaskId, isRestore = false) {
        const card = Object.values(tasks).find(t => t.state.backendTaskId === backendTaskId);
        if (!card) {
            if (isRestore) {
                console.warn(`Restored task ${backendTaskId} not found in UI, removing from storage.`);
                const savedTaskIds = JSON.parse(getFromStorage('active_task_ids', '[]'));
                const newIds = savedTaskIds.filter(id => id !== backendTaskId);
                saveToStorage('active_task_ids', JSON.stringify(newIds));
            }
            return;
        }
        const {elements, state} = card;
        const cardId = elements.card.dataset.cardId;

        try {
            const response = await fetch(`/service/status/${backendTaskId}`);
            if (!response.ok) {
                if (response.status === 404 && isRestore) {
                    console.warn(`Task ${backendTaskId} not found on server (404). Removing from UI.`);
                    await removeTask(cardId);
                }
                return;
            }
            const status = await response.json();

            if (status.original_filename && (!state.file || isRestore)) {
                elements.fileNameDisplay.textContent = status.original_filename;
                elements.fileNameDisplayWrapper.style.display = 'block';
            }

            elements.statusMessage.textContent = status.status_message || getText('status_gettingStatus');
            elements.statusMessage.className = `status-message small ${status.error_flag ? 'text-danger' : 'text-info'}`;

            if (!status.is_processing) {
                pollLogs(backendTaskId); // Get final logs
                stopPolling(backendTaskId);
                state.isTranslating = false;
                elements.startBtn.disabled = false;
                elements.startBtn.innerHTML = `<i class="bi bi-arrow-clockwise me-1"></i><span data-i18n="btn_reTranslate">${getText('btn_reTranslate')}</span>`;
                elements.startBtn.classList.replace('btn-danger', 'btn-primary');
                elements.progress.style.display = 'none';

                if (status.download_ready && !status.error_flag) {
                    elements.statusMessage.className = 'status-message small text-success';
                    updateDownloadButtons(cardId, status);
                } else {
                    elements.downloadButtons.style.display = 'none';
                }
            } else {
                state.isTranslating = true;
                elements.startBtn.innerHTML = `<i class="bi bi-stop-circle-fill me-1"></i><span data-i18n="btn_cancelTranslation">${getText('btn_cancelTranslation')}</span>`;
                elements.startBtn.classList.replace('btn-primary', 'btn-danger');
                elements.startBtn.disabled = false;
                elements.progress.style.display = 'block';
                elements.downloadButtons.style.display = 'none';

                if (isRestore && !card.intervals.status) {
                    startPolling(backendTaskId);
                }
            }

        } catch (error) {
            console.error(`[${backendTaskId}] Error polling status:`, error);
            elements.statusMessage.textContent = getText('status_updateError');
            elements.statusMessage.className = 'status-message small text-danger';
        }
    }

    // --- Download and Preview ---
    function populateDownloadMenu(menuElement, downloads, cardId) {
        menuElement.innerHTML = ''; // Clear existing items
        if (!downloadMenuTemplate) return false;

        const content = downloadMenuTemplate.content.cloneNode(true);
        // Translate the template before using
        content.querySelectorAll('[data-i18n]').forEach(el => el.innerHTML = getText(el.dataset.i18n));
        let anyLinkAdded = false;

        const setupLink = (selector, key) => {
            const li = content.querySelector(selector);
            if (li && downloads[key]) {
                li.querySelector('a').href = downloads[key];
                menuElement.appendChild(li);
                anyLinkAdded = true;
            }
        };

        setupLink('.download-item-md', 'markdown');
        setupLink('.download-item-md-zip', 'markdown_zip');
        setupLink('.download-item-txt', 'txt');
        setupLink('.download-item-json', 'json');
        setupLink('.download-item-docx', 'docx');
        setupLink('.download-item-xlsx', 'xlsx');
        setupLink('.download-item-srt', 'srt');
        setupLink('.download-item-epub', 'epub');
        setupLink('.download-item-html', 'html');

        // Special handler for PDF, which is generated on the fly
        const pdfLi = content.querySelector('.download-item-pdf');
        if (pdfLi && downloads.html) {
            const pdfLink = pdfLi.querySelector('a');
            pdfLink.href = '#';
            pdfLink.onclick = (e) => {
                e.preventDefault();
                downloadPdf(cardId);
            };
            menuElement.appendChild(pdfLi);
            anyLinkAdded = true;
        }

        return anyLinkAdded;
    }


    function updateDownloadButtons(cardId, status) {
        const {elements, state} = tasks[cardId];
        const {downloads} = status;
        state.downloads = downloads; // Store for preview

        const {previewBtn, downloadButtons, downloadMenuContainer} = elements;

        // Reset visibility
        previewBtn.style.display = 'none';
        downloadButtons.style.display = 'none';

        if (downloads.html) {
            state.htmlUrl = downloads.html;
            state.fileNameStem = status.original_filename_stem;
            previewBtn.style.display = 'inline-block';
            previewBtn.onclick = () => setupPreview(cardId);
        }

        const anyDownloadAvailable = populateDownloadMenu(downloadMenuContainer, downloads, cardId);

        if (anyDownloadAvailable || downloads.html) {
            downloadButtons.style.display = 'flex';
        }
    }

    function setupPreview(cardId) {
        const {state} = tasks[cardId];
        if (!state.htmlUrl) return;

        const existingOriginalContent = originalPreviewPane.querySelector('iframe, pre, p');
        if (existingOriginalContent) existingOriginalContent.remove();
        translatedPreviewFrame.src = 'about:blank';
        translatedPreviewFrame.srcdoc = getText('preview_loading');

        setPreviewDisplayMode('bilingual');
        previewOffcanvas.show();

        const menu = document.getElementById('previewDownloadMenu');
        populateDownloadMenu(menu, state.downloads, cardId);


        if (state.file) {
            const fileType = state.file.type;
            const fileExtension = state.file.name.split('.').pop().toLowerCase();
            const textLikeExtensions = ['md', 'json', 'xml', 'log', 'py', 'js', 'css', 'java', 'c', 'cpp', 'h', 'hpp', 'cs', 'rb', 'php', 'swift', 'kt', 'go', 'rs', 'ts', 'txt', 'srt'];

            if (fileType.startsWith('text/') || textLikeExtensions.includes(fileExtension)) {
                const pre = document.createElement('pre');
                state.file.text()
                    .then(text => pre.textContent = text)
                    .catch(() => pre.textContent = getText('preview_cantReadOriginal'));
                originalPreviewPane.appendChild(pre);
            } else if (['application/pdf', 'text/html'].includes(fileType) || ['html', 'htm'].includes(fileExtension)) {
                const iframe = document.createElement('iframe');
                iframe.src = URL.createObjectURL(state.file);
                originalPreviewPane.appendChild(iframe);
            } else {
                const p = document.createElement('p');
                p.className = 'p-3 text-muted';
                p.textContent = `${getText('preview_cantPreviewType')} (${fileType || 'unknown: ' + fileExtension}).`;
                originalPreviewPane.appendChild(p);
            }
        } else {
            const p = document.createElement('p');
            p.className = 'p-3 text-muted';
            p.textContent = getText('preview_noOriginalCache');
            originalPreviewPane.appendChild(p);
        }

        fetch(state.htmlUrl)
            .then(resp => resp.ok ? resp.text() : Promise.reject(`HTTP error ${resp.status}`))
            .then(html => {
                translatedPreviewFrame.srcdoc = html;
            })
            .catch(err => {
                console.error('Preview fetch failed:', err);
                translatedPreviewFrame.srcdoc = `${getText('preview_loadFailed')}<p>${err.message}</p>`;
            });
    }

    function downloadPdf(cardId) {
        const {elements, state} = tasks[cardId];
        if (!state.htmlUrl) return;

        const toast = new bootstrap.Toast(document.createElement('div'), {
            autohide: true,
            delay: 3000
        });
        toast._element.classList.add('toast', 'position-fixed', 'top-0', 'end-0', 'p-3', 'bg-info', 'text-white');
        toast._element.innerHTML = `<div class="toast-body">${getText('pdf_preparing')}</div>`;
        document.body.appendChild(toast._element);
        toast.show();

        fetch(state.htmlUrl)
            .then(resp => resp.ok ? resp.text() : Promise.reject(`HTTP error ${resp.status}`))
            .then(html => {
                printFrameEl.onload = () => {
                    setTimeout(() => {
                        try {
                            printFrameEl.contentWindow.focus();
                            printFrameEl.contentWindow.print();
                        } catch (err) {
                            alert(getText('pdf_print_failed'));
                        } finally {
                            printFrameEl.onload = null;
                            printFrameEl.srcdoc = ''; // Clear content
                        }
                    }, 500);
                };
                printFrameEl.srcdoc = html;
            })
            .catch(err => {
                alert(getText('pdf_fetch_failed'));
            });
    }

    function setPreviewDisplayMode(mode) {
        if (previewSplitInstance) {
            previewSplitInstance.destroy();
            previewSplitInstance = null;
        }

        const isMobileView = window.innerWidth < 992;
        const splitContainer = document.querySelector('.preview-split-container');
        originalPreviewContainer.style.display = 'flex';
        translatedPreviewContainer.style.display = 'flex';
        [originalPreviewContainer, translatedPreviewContainer].forEach(el => {
            el.style.width = '';
            el.style.height = '';
        });
        splitContainer.style.flexDirection = isMobileView ? 'column' : 'row';

        if (mode === 'bilingual') {
            previewOffcanvasLabel.textContent = getText('preview_bilingual');

            if (isMobileView) {
                previewSplitInstance = Split(['#originalPreviewContainer', '#translatedPreviewContainer'], {
                    direction: 'vertical', sizes: [50, 50], minSize: 150, gutterSize: 10, cursor: 'row-resize',
                });
            } else {
                previewSplitInstance = Split(['#originalPreviewContainer', '#translatedPreviewContainer'], {
                    direction: 'horizontal', sizes: [50, 50], minSize: 200, gutterSize: 10, cursor: 'col-resize',
                });
            }

            setBilingualViewBtn.classList.add('btn-primary');
            setBilingualViewBtn.classList.remove('btn-outline-primary');
            setTranslatedOnlyViewBtn.classList.remove('btn-primary');
            setTranslatedOnlyViewBtn.classList.add('btn-outline-primary');

        } else { // mode === 'translatedOnly'
            previewOffcanvasLabel.textContent = getText('preview_translatedOnly');
            originalPreviewContainer.style.display = 'none';

            if (isMobileView) {
                translatedPreviewContainer.style.height = '100%';
            } else {
                translatedPreviewContainer.style.width = '100%';
            }

            setTranslatedOnlyViewBtn.classList.add('btn-primary');
            setTranslatedOnlyViewBtn.classList.remove('btn-outline-primary');
            setBilingualViewBtn.classList.remove('btn-primary');
            setBilingualViewBtn.classList.add('btn-outline-primary');
        }
    }

    // --- Password Toggle Functionality ---
    function setupPasswordToggle(button) {
        const targetId = button.dataset.target;
        const passwordInput = document.getElementById(targetId);
        const icon = button.querySelector('i');

        button.addEventListener('click', () => {
            if (passwordInput.type === 'password') {
                passwordInput.type = 'text';
                icon.classList.remove('bi-eye-slash');
                icon.classList.add('bi-eye');
            } else {
                passwordInput.type = 'password';
                icon.classList.remove('bi-eye');
                icon.classList.add('bi-eye-slash');
            }
        });
    }


    // --- Initialization ---
    async function init() {
        // Step 1: Fetch i18n data. This is critical for all UI text, including error messages.
        try {
            const response = await fetch("/static/i18nData.json");
            if (!response.ok) throw new Error(`HTTP error! status: ${response.status}`);
            i18nData = await response.json(); // Overwrite the initial fallback object
        } catch (error) {
            console.error("Fatal: Failed to load i18n data. Application cannot start.", error);
            const lang = getFromStorage('ui_language') || (navigator.language.toLowerCase().startsWith('en') ? 'en' : 'zh');
            currentLang = lang;
            alert(getText('init_i18n_failed_alert'));
            return; // Stop execution
        }

        // Step 2: Fetch other backend data
        isAdminMode = window.location.pathname.includes('/admin');
        try {
            const [metaRes, enginRes, paramsRes] = await Promise.all([
                fetch("/service/meta"), fetch('/service/engin-list'), fetch("/service/default-params")
            ]);
            if (!metaRes.ok || !enginRes.ok || !paramsRes.ok) {
                throw new Error("Failed to fetch initial data from server.");
            }
            const meta = await metaRes.json();
            versionDisplay.textContent = `v${meta.version}`;

            const enginList = await enginRes.json();

            // Populate convert engin select
            convertEnginSelect.innerHTML = ''; // Clear
            const defaultOption = document.createElement('option');
            defaultOption.value = 'identity';
            convertEnginSelect.appendChild(defaultOption);

            enginList.forEach(engin => {
                const option = document.createElement('option');
                option.value = engin;
                convertEnginSelect.appendChild(option);
            });

            defaultParams = await paramsRes.json();
        } catch (error) {
            console.error("Initialization failed:", error);
            alert(getText('init_failed_alert'));
            return;
        }

        // Step 3: Initialize i18n system (now that all data is loaded and dynamic elements are populated)
        initI18n();

        // Step 4: Restore user settings and update UI based on them
        workflowTypeSelect.value = getFromStorage('translator_last_workflow', 'markdown_based');
        autoWorkflowSwitch.checked = getFromStorage('translator_auto_workflow_enabled', 'true') === 'true';
        xlsxInsertModeSelect.value = getFromStorage('translator_xlsx_insert_mode', 'replace');
        xlsxSeparatorInput.value = getFromStorage('translator_xlsx_separator', '\\n');
        docxInsertModeSelect.value = getFromStorage('translator_docx_insert_mode', 'replace');
        docxSeparatorInput.value = getFromStorage('translator_docx_separator', '\\n');
        srtInsertModeSelect.value = getFromStorage('translator_srt_insert_mode', 'replace');
        srtSeparatorInput.value = getFromStorage('translator_srt_separator', '\\n');
        epubInsertModeSelect.value = getFromStorage('translator_epub_insert_mode', 'replace');
        epubSeparatorInput.value = getFromStorage('translator_epub_separator', '\\n');
        htmlInsertModeSelect.value = getFromStorage('translator_html_insert_mode', 'replace');
        htmlSeparatorInput.value = getFromStorage('translator_html_separator', ' ');
        jsonPathsTextarea.value = getFromStorage('translator_json_paths');
        platformSelect.value = getFromStorage('translator_last_platform', 'https://api.openai.com/v1');
        convertEnginSelect.value = getFromStorage('translator_convert_engin', 'mineru');
        modelVersionSelect.value = getFromStorage('translator_model_version', 'vlm');
        toLangSelect.value = getFromStorage('translator_to_lang', '中文');
        customLangInput.value = getFromStorage('translator_custom_to_lang', '');
        formulaCheckbox.checked = getFromStorage('translator_formula_ocr', 'true') === 'true';
        codeCheckbox.checked = getFromStorage('translator_code_ocr', 'true') === 'true';
        customPromptTranslateArea.value = getFromStorage("custom_prompt");

        // Set thinking mode from storage or default
        const savedThinkingMode = getFromStorage('translator_thinking_mode', 'default');
        const thinkingRadioToSelect = document.querySelector(`#thinkingModeBtnGroup input[value="${savedThinkingMode}"]`);
        if (thinkingRadioToSelect) thinkingRadioToSelect.checked = true;

        // Initial UI updates based on restored settings
        updateWorkflowUI();
        updatePlatformUI();
        updateConvertEnginUI();
        updateCustomLangUI();

        // Setup sliders
        setupSlider(chunkSizeSlider, chunkSizeDisplay, chunkSizeReset, 'chunk_size', defaultParams);
        setupSlider(concurrentSlider, concurrentDisplay, concurrentReset, 'concurrent', defaultParams);
        setupSlider(temperatureSlider, temperatureDisplay, temperatureReset, 'temperature', defaultParams);

        // Setup other UI elements
        document.querySelectorAll('.toggle-password').forEach(button => setupPasswordToggle(button));

        // Restore tasks
        if (isAdminMode) {
            document.title = "DocuTranslate - Admin Panel";
            try {
                const response = await fetch('/service/task-list');
                if (!response.ok) throw new Error(`Failed to fetch task list: ${response.statusText}`);
                const allTaskIds = await response.json();
                if (allTaskIds && Array.isArray(allTaskIds) && allTaskIds.length > 0) {
                    allTaskIds.reverse().forEach(taskId => createTaskCard(taskId, true));
                }
            } catch (error) {
                console.error("Admin mode: Failed to load task list from server.", error);
                alert(getText('admin_tasklist_failed'));
            }
            updateTaskPlaceholderVisibility();
        } else {
            const savedTaskIds = JSON.parse(getFromStorage('active_task_ids', '[]'));
            if (savedTaskIds.length > 0) {
                savedTaskIds.forEach(taskId => createTaskCard(taskId, true));
            } else {
                createTaskCard();
            }
        }

        // Add event listeners for saving settings
        workflowTypeSelect.addEventListener('change', updateWorkflowUI);
        autoWorkflowSwitch.addEventListener('change', e => saveToStorage('translator_auto_workflow_enabled', e.target.checked));
        xlsxInsertModeSelect.addEventListener('change', e => {
            updateSeparatorVisibility(xlsxInsertModeSelect, xlsxSeparatorGroup);
            saveToStorage('translator_xlsx_insert_mode', e.target.value);
        });
        xlsxSeparatorInput.addEventListener('input', e => saveToStorage('translator_xlsx_separator', e.target.value));
        docxInsertModeSelect.addEventListener('change', e => {
            updateSeparatorVisibility(docxInsertModeSelect, docxSeparatorGroup);
            saveToStorage('translator_docx_insert_mode', e.target.value);
        });
        docxSeparatorInput.addEventListener('input', e => saveToStorage('translator_docx_separator', e.target.value));
        srtInsertModeSelect.addEventListener('change', e => {
            updateSeparatorVisibility(srtInsertModeSelect, srtSeparatorGroup);
            saveToStorage('translator_srt_insert_mode', e.target.value);
        });
        srtSeparatorInput.addEventListener('input', e => saveToStorage('translator_srt_separator', e.target.value));
        epubInsertModeSelect.addEventListener('change', e => {
            updateSeparatorVisibility(epubInsertModeSelect, epubSeparatorGroup);
            saveToStorage('translator_epub_insert_mode', e.target.value);
        });
        epubSeparatorInput.addEventListener('input', e => saveToStorage('translator_epub_separator', e.target.value));
        htmlInsertModeSelect.addEventListener('change', e => {
            updateSeparatorVisibility(htmlInsertModeSelect, htmlSeparatorGroup);
            saveToStorage('translator_html_insert_mode', e.target.value);
        });
        htmlSeparatorInput.addEventListener('input', e => saveToStorage('translator_html_separator', e.target.value));
        jsonPathsTextarea.addEventListener('input', e => saveToStorage('translator_json_paths', e.target.value));
        platformSelect.addEventListener('change', updatePlatformUI);
        apikeyInput.addEventListener('input', e => saveToStorage(`translator_platform_${platformSelect.value}_apikey`, e.target.value));
        modelInput.addEventListener('input', e => saveToStorage(`translator_platform_${platformSelect.value}_model_id`, e.target.value));
        baseUrlInput.addEventListener('input', e => {
            if (platformSelect.value === 'custom') saveToStorage('translator_platform_custom_base_url', e.target.value);
        });
        convertEnginSelect.addEventListener('change', () => updateConvertEnginUI(false));
        mineruTokenInput.addEventListener('input', e => saveToStorage('translator_mineru_token', e.target.value));
        modelVersionSelect.addEventListener('change', e => saveToStorage('translator_model_version', e.target.value));
        toLangSelect.addEventListener('change', e => {
            saveToStorage('translator_to_lang', e.target.value);
            updateCustomLangUI();
        });
        customLangInput.addEventListener('input', e => saveToStorage('translator_custom_to_lang', e.target.value));
        document.querySelectorAll('#thinkingModeBtnGroup input[name="thinking"]').forEach(radio => {
            radio.addEventListener('change', (e) => {
                saveToStorage('translator_thinking_mode', e.target.value);
            });
        });
        formulaCheckbox.addEventListener('change', e => saveToStorage('translator_formula_ocr', e.target.checked));
        codeCheckbox.addEventListener('change', e => saveToStorage('translator_code_ocr', e.target.checked));
        customPromptTranslateArea.addEventListener('input', () => saveToStorage("custom_prompt", customPromptTranslateArea.value));

        // Add task button listener
        addNewTaskBtn.addEventListener('click', () => createTaskCard());

        // Add preview listeners
        setBilingualViewBtn.addEventListener('click', () => setPreviewDisplayMode('bilingual'));
        setTranslatedOnlyViewBtn.addEventListener('click', () => setPreviewDisplayMode('translatedOnly'));
        window.addEventListener('resize', () => {
            // Re-initialize split view on resize if canvas is open
            if (previewOffcanvasEl.classList.contains('show')) {
                setPreviewDisplayMode(originalPreviewContainer.style.display !== 'none' ? 'bilingual' : 'translatedOnly');
            }
        });
    }

    // --- Theme switcher logic ---
    const getPreferredTheme = () => {
        const storedTheme = localStorage.getItem('theme');
        if (storedTheme) {
            return storedTheme;
        }
        return 'auto';
    };
    const setTheme = theme => {
        if (theme === 'auto') {
            document.documentElement.setAttribute('data-bs-theme', window.matchMedia('(prefers-color-scheme: dark)').matches ? 'dark' : 'light');
        } else {
            document.documentElement.setAttribute('data-bs-theme', theme);
        }
    };
    const showActiveTheme = (theme) => {
        document.querySelectorAll('[data-bs-theme-value]').forEach(element => {
            element.classList.remove('active');
        });
        const activeButton = document.querySelector(`[data-bs-theme-value="${theme}"]`);
        if (activeButton) {
            activeButton.classList.add('active');
        }
    };
    const preferredTheme = getPreferredTheme();
    setTheme(preferredTheme);
    showActiveTheme(preferredTheme);
    window.matchMedia('(prefers-color-scheme: dark)').addEventListener('change', () => {
        const storedTheme = localStorage.getItem('theme');
        if (storedTheme === 'auto' || !storedTheme) {
            setTheme('auto');
        }
    });
    document.querySelectorAll('[data-bs-theme-value]').forEach(toggle => {
        toggle.addEventListener('click', () => {
            const theme = toggle.getAttribute('data-bs-theme-value');
            localStorage.setItem('theme', theme);
            setTheme(theme);
            showActiveTheme(theme);
        });
    });

    // --- Start the application ---
    document.addEventListener('DOMContentLoaded', init);
</script>
</body>
</html>
\ No newline at end of file