From 9a7dc28c14299ec6f0aaf03e248cc9479fc2faad Mon Sep 17 00:00:00 2001
From: Anion <1005128408@qq.com>
Date: Mon, 30 Mar 2026 22:15:42 +0800
Subject: [PATCH 1/6] fix: unify trial-mode API settings storage keys

---
 .../src/services/apiSettingsService.ts        | 27 ++++++++++++++-----
 .../src/services/apiSettingsService.ts        | 27 ++++++++++++++-----
 2 files changed, 42 insertions(+), 12 deletions(-)

diff --git a/frontend_en/src/services/apiSettingsService.ts b/frontend_en/src/services/apiSettingsService.ts
index 6b474b1..48cafcc 100644
--- a/frontend_en/src/services/apiSettingsService.ts
+++ b/frontend_en/src/services/apiSettingsService.ts
@@ -16,16 +16,29 @@ export interface ApiSettings {
 }
 
 const STORAGE_KEY_PREFIX = 'kb_api_settings_';
+const TRIAL_STORAGE_SUFFIXES = ['default', 'local', 'global'] as const;
+
+function isTrialStorageUser(userId: string | null): boolean {
+  return !userId || TRIAL_STORAGE_SUFFIXES.includes(userId as typeof TRIAL_STORAGE_SUFFIXES[number]);
+}
+
+function getStorageKeys(userId: string | null): string[] {
+  if (isTrialStorageUser(userId)) {
+    return TRIAL_STORAGE_SUFFIXES.map((suffix) => `${STORAGE_KEY_PREFIX}${suffix}`);
+  }
+  return [`${STORAGE_KEY_PREFIX}${userId}`];
+}
 
 /**
  * Get API settings for a user (or global if userId is null)
  */
 export function getApiSettings(userId: string | null): ApiSettings | null {
   try {
-    const key = userId ? `${STORAGE_KEY_PREFIX}${userId}` : `${STORAGE_KEY_PREFIX}global`;
-    const stored = localStorage.getItem(key);
-    if (stored) {
-      return JSON.parse(stored);
+    for (const key of getStorageKeys(userId)) {
+      const stored = localStorage.getItem(key);
+      if (stored) {
+        return JSON.parse(stored);
+      }
     }
   } catch (err) {
     console.error('Failed to load API settings:', err);
@@ -45,8 +58,10 @@ export function getApiSettings(userId: string | null): ApiSettings | null {
  */
 export function saveApiSettings(userId: string | null, settings: ApiSettings): void {
   try {
-    const key = userId ? `${STORAGE_KEY_PREFIX}${userId}` : `${STORAGE_KEY_PREFIX}global`;
-    localStorage.setItem(key, JSON.stringify(settings));
+    const serialized = JSON.stringify(settings);
+    for (const key of getStorageKeys(userId)) {
+      localStorage.setItem(key, serialized);
+    }
   } catch (err) {
     console.error('Failed to save API settings:', err);
   }
diff --git a/frontend_zh/src/services/apiSettingsService.ts b/frontend_zh/src/services/apiSettingsService.ts
index 6b474b1..48cafcc 100644
--- a/frontend_zh/src/services/apiSettingsService.ts
+++ b/frontend_zh/src/services/apiSettingsService.ts
@@ -16,16 +16,29 @@ export interface ApiSettings {
 }
 
 const STORAGE_KEY_PREFIX = 'kb_api_settings_';
+const TRIAL_STORAGE_SUFFIXES = ['default', 'local', 'global'] as const;
+
+function isTrialStorageUser(userId: string | null): boolean {
+  return !userId || TRIAL_STORAGE_SUFFIXES.includes(userId as typeof TRIAL_STORAGE_SUFFIXES[number]);
+}
+
+function getStorageKeys(userId: string | null): string[] {
+  if (isTrialStorageUser(userId)) {
+    return TRIAL_STORAGE_SUFFIXES.map((suffix) => `${STORAGE_KEY_PREFIX}${suffix}`);
+  }
+  return [`${STORAGE_KEY_PREFIX}${userId}`];
+}
 
 /**
  * Get API settings for a user (or global if userId is null)
  */
 export function getApiSettings(userId: string | null): ApiSettings | null {
   try {
-    const key = userId ? `${STORAGE_KEY_PREFIX}${userId}` : `${STORAGE_KEY_PREFIX}global`;
-    const stored = localStorage.getItem(key);
-    if (stored) {
-      return JSON.parse(stored);
+    for (const key of getStorageKeys(userId)) {
+      const stored = localStorage.getItem(key);
+      if (stored) {
+        return JSON.parse(stored);
+      }
     }
   } catch (err) {
     console.error('Failed to load API settings:', err);
@@ -45,8 +58,10 @@ export function getApiSettings(userId: string | null): ApiSettings | null {
  */
 export function saveApiSettings(userId: string | null, settings: ApiSettings): void {
   try {
-    const key = userId ? `${STORAGE_KEY_PREFIX}${userId}` : `${STORAGE_KEY_PREFIX}global`;
-    localStorage.setItem(key, JSON.stringify(settings));
+    const serialized = JSON.stringify(settings);
+    for (const key of getStorageKeys(userId)) {
+      localStorage.setItem(key, serialized);
+    }
   } catch (err) {
     console.error('Failed to save API settings:', err);
   }

From 74d49b4ef464ba7c1ce76eb4d93d6d0d82e47a6f Mon Sep 17 00:00:00 2001
From: Anion <1005128408@qq.com>
Date: Tue, 31 Mar 2026 15:26:10 +0800
Subject: [PATCH 2/6] feat: merge two-step mindmap LLM into single-pass with
 improved prompt

Combine analyze_structure + generate_mermaid into one LLM call that
directly outputs Markdown. Uses a detailed knowledge-map prompt that
adapts to article type, producing structured nodes instead of bare titles.
---
 workflow_engine/workflow/wf_kb_mindmap.py | 115 +++++++++-------------
 1 file changed, 48 insertions(+), 67 deletions(-)

diff --git a/workflow_engine/workflow/wf_kb_mindmap.py b/workflow_engine/workflow/wf_kb_mindmap.py
index 7f04e7c..05552c6 100644
--- a/workflow_engine/workflow/wf_kb_mindmap.py
+++ b/workflow_engine/workflow/wf_kb_mindmap.py
@@ -13,6 +13,7 @@
 from workflow_engine.utils import get_project_root
 
 log = get_logger(__name__)
+_mindmap_structure_logged_once = False
 
 # Try importing office libraries
 try:
@@ -156,95 +157,75 @@ async def process_file(file_path: str) -> Dict[str, Any]:
         return state
 
     async def analyze_structure_node(state: KBMindMapState) -> KBMindMapState:
+        """Skip — merged into generate_mermaid_node for single-pass generation."""
+        state.content_structure = "merged"
+        return state
+
+    async def generate_mermaid_node(state: KBMindMapState) -> KBMindMapState:
         """
-        Analyze content structure using LLM
+        Single-pass: analyze documents and generate Markdown mindmap directly.
         """
         if not state.file_contents:
-            state.content_structure = "No content available for analysis."
+            state.mermaid_code = "# Error\n## No content available"
             return state
 
-        # Format file contents
         contents_str = ""
         for item in state.file_contents:
             contents_str += f"=== {item['filename']} ===\n{item['content']}\n\n"
 
-        # Structure analysis prompt
         language = state.request.language
         max_depth = state.request.max_depth
-        prompt = f"""你是一位专业的知识结构分析师。请分析以下文档内容，提取出层级化的知识结构。
 
-要求：
-1. 识别主要主题和子主题
-2. 提取关键概念和要点
-3. 建立清晰的层级关系（最多{max_depth}层）
-4. 使用{language}语言
-5. 输出格式为层级化的文本结构，使用缩进表示层级
+        prompt = f"""请基于以下文档内容，生成一张**层级清晰、主题归纳明确、适合快速把握全文结构的思维导图**。你的目标是把文章压缩成一张"知识地图"，让读者能够迅速理解这篇文章的核心主题、主要模块、关键内容，以及各部分之间的层级关系。
 
-文档内容：
-{contents_str}
+请按照下面的方法完成：
 
-请输出层级化的知识结构："""
+先通读全文，识别文章真正的中心主题，用一句高度概括的话作为根节点（# 一级标题）。这个根节点需要能够覆盖全文主旨，而不是局部内容。
 
-        try:
-            agent = create_agent(
-                name="kb_prompt_agent",
-                model_name=state.request.model,
-                chat_api_url=state.request.chat_api_url,
-                temperature=0.3,
-                parser_type="text"
-            )
+然后围绕中心主题，提炼出 **4–8 个一级主题**（## 二级标题）。一级主题要能够代表全文最重要的几个结构板块。请优先从文章本身的结构、论述重心、主题模块、关键信息簇中提炼一级主题，使它们能够共同构成全文的主干。
 
-            temp_state = MainState(request=state.request)
-            res_state = await agent.execute(temp_state, prompt=prompt)
+接着在每个一级主题下继续拆分 **2–4 个二级主题**（### 三级标题）。二级主题要承接上级主题，概括该部分最值得保留的核心内容，例如关键概念、主要论点、重要机制、核心步骤、代表性案例、主要证据、结果表现、应用场景、影响因素、行动建议等。
 
-            state.content_structure = _extract_text_result(res_state, "kb_prompt_agent") or "[Structure analysis failed]"
-        except Exception as e:
-            log.error(f"Structure analysis failed: {e}")
-            state.content_structure = f"[Structure analysis error: {e}]"
+当某个二级主题中存在特别重要的细节时，继续提炼 **1–3 个三级要点**（#### 四级标题），用于补充最关键的信息，例如术语、条件、指标、例子、判断依据、具体表现、限制条件、后续影响等。
 
-        return state
+整体层级最多{max_depth}层。使用{language}语言。
 
-    async def generate_mermaid_node(state: KBMindMapState) -> KBMindMapState:
-        """
-        Generate Mermaid mindmap syntax using LLM
-        """
-        if not state.content_structure or state.content_structure.startswith("["):
-            state.mermaid_code = "mindmap\n  root((Error))\n    No content structure available"
-            return state
+整张思维导图要体现出一种**知识整理型、结构概览型、主题分解型**的风格。重点是帮助读者快速理解全文内容版图，而不是只罗列摘要句子。请让结构体现出"从总到分、由主到次、层层展开"的组织逻辑。
+
+请根据文章类型，自适应选择最合适的组织框架：
+* 研究型、分析型文章：背景、问题、核心观点、方法机制、证据结果、意义影响、局限延伸
+* 新闻、时评、纪实型文章：主题事件、背景脉络、关键事实、各方观点、原因影响、趋势走向
+* 科普、说明型文章：核心概念、原理机制、特征表现、应用场景、常见理解、总结启发
+* 教程、方法型文章：目标、前提条件、步骤模块、关键技巧、注意事项、应用建议
+* 商业、产品、行业文章：对象定位、背景环境、核心策略、运行方式、优势价值、风险挑战、发展趋势
+* 访谈、观点型文章：核心立场、主要观点、支撑理由、经验案例、延伸启示
 
-        # Mermaid generation prompt
-        style = state.request.mindmap_style
-        prompt = f"""你是一位专业的Mermaid图表生成专家。请根据以下知识结构，生成Mermaid mindmap语法。
-
-知识结构：
-{state.content_structure}
-
-要求：
-1. 使用Mermaid mindmap语法
-2. 风格：{style}
-3. 保持层级关系清晰
-4. 节点名称简洁明了
-5. 只输出Mermaid代码，不要有其他解释
-
-Mermaid mindmap语法示例：
-```
-mindmap
-  root((中心主题))
-    主题1
-      子主题1.1
-      子主题1.2
-    主题2
-      子主题2.1
-```
-
-请生成Mermaid mindmap代码："""
+节点命名请尽量简洁而有信息量。每个节点都使用**适合放入思维导图框中的短语式表达**，让人一眼就能理解该节点要表达的重点。
+
+生成标准：
+1. 忠实反映原文主线
+2. 节点之间要有明确层级关系
+3. 同一级节点尽量保持并列、均衡、可比较
+4. 优先保留能够帮助理解全文框架的内容
+5. 让整张图看起来像一张"文章结构与知识重点总览图"
+6. 读者即使不读原文，也能通过这张导图把握文章的大体结构与核心内容
+
+**输出格式要求：**
+- 使用 Markdown 标题格式：# 根节点，## 一级主题，### 二级主题，#### 三级要点
+- 只输出 Markdown 内容，不要有其他解释
+- 不要使用代码块包裹
+
+文档内容：
+{contents_str}
+
+请直接输出思维导图："""
 
         try:
             agent = create_agent(
                 name="kb_prompt_agent",
                 model_name=state.request.model,
                 chat_api_url=state.request.chat_api_url,
-                temperature=0.5,
+                temperature=0.3,
                 parser_type="text"
             )
 
@@ -253,7 +234,7 @@ async def generate_mermaid_node(state: KBMindMapState) -> KBMindMapState:
 
             mermaid_raw = _extract_text_result(res_state, "kb_prompt_agent")
             if mermaid_raw:
-                # Extract mermaid code from markdown code blocks if present
+                # Extract content from markdown code blocks if present
                 if "```" in mermaid_raw:
                     lines = mermaid_raw.split("\n")
                     in_code_block = False
@@ -268,10 +249,10 @@ async def generate_mermaid_node(state: KBMindMapState) -> KBMindMapState:
                 else:
                     state.mermaid_code = mermaid_raw
             else:
-                state.mermaid_code = "mindmap\n  root((Error))\n    Generation failed"
+                state.mermaid_code = "# Error\n## Generation failed"
         except Exception as e:
-            log.error(f"Mermaid generation failed: {e}")
-            state.mermaid_code = f"mindmap\n  root((Error))\n    {str(e)}"
+            log.error(f"Mindmap generation failed: {e}")
+            state.mermaid_code = f"# Error\n## {str(e)}"
 
         # Save mermaid code to file
         try:

From a6897217589d6c1c6f6cc0555275a9254ce32048 Mon Sep 17 00:00:00 2001
From: Anion <1005128408@qq.com>
Date: Tue, 31 Mar 2026 15:26:18 +0800
Subject: [PATCH 3/6] feat: add simple-mind-map dependency and utility
 functions

- Replace mermaid with simple-mind-map in both frontends
- Add mermaidToMarkdown/markdownToMermaid converters for format compat
- Add TypeScript declarations for simple-mind-map
---
 frontend_en/package-lock.json              | 1352 ++++++++++----------
 frontend_en/package.json                   |    2 +-
 frontend_en/src/types/simple-mind-map.d.ts |   76 ++
 frontend_en/src/utils/mermaidToMarkdown.ts |  124 ++
 frontend_zh/package-lock.json              | 1352 ++++++++++----------
 frontend_zh/package.json                   |    2 +-
 frontend_zh/src/types/simple-mind-map.d.ts |   76 ++
 frontend_zh/src/utils/mermaidToMarkdown.ts |  124 ++
 8 files changed, 1806 insertions(+), 1302 deletions(-)
 create mode 100644 frontend_en/src/types/simple-mind-map.d.ts
 create mode 100644 frontend_en/src/utils/mermaidToMarkdown.ts
 create mode 100644 frontend_zh/src/types/simple-mind-map.d.ts
 create mode 100644 frontend_zh/src/utils/mermaidToMarkdown.ts

diff --git a/frontend_en/package-lock.json b/frontend_en/package-lock.json
index 873bc08..7ca7edd 100644
--- a/frontend_en/package-lock.json
+++ b/frontend_en/package-lock.json
@@ -13,12 +13,12 @@
         "framer-motion": "^10.16.4",
         "katex": "^0.16.28",
         "lucide-react": "^0.294.0",
-        "mermaid": "^10.6.1",
         "pdfjs-dist": "^5.4.296",
         "react": "^18.2.0",
         "react-dom": "^18.2.0",
         "react-markdown": "^9.1.0",
         "react-pdf": "^10.3.0",
+        "simple-mind-map": "^0.14.0-fix.2",
         "tailwind-merge": "^2.0.0",
         "zustand": "^4.4.7"
       },
@@ -328,12 +328,6 @@
         "node": ">=6.9.0"
       }
     },
-    "node_modules/@braintree/sanitize-url": {
-      "version": "6.0.4",
-      "resolved": "https://registry.npmjs.org/@braintree/sanitize-url/-/sanitize-url-6.0.4.tgz",
-      "integrity": "sha512-s3jaWicZd0pkP0jf5ysyHUI/RE7MHos6qlToFcGWXVp+ykHOy77OUMrfbgJ9it2C5bow7OIQwYYaHjk9XlBQ2A==",
-      "license": "MIT"
-    },
     "node_modules/@emotion/is-prop-valid": {
       "version": "0.8.8",
       "resolved": "https://registry.npmjs.org/@emotion/is-prop-valid/-/is-prop-valid-0.8.8.tgz",
@@ -1080,6 +1074,24 @@
         "node": ">= 8"
       }
     },
+    "node_modules/@pdf-lib/standard-fonts": {
+      "version": "1.0.0",
+      "resolved": "https://registry.npmjs.org/@pdf-lib/standard-fonts/-/standard-fonts-1.0.0.tgz",
+      "integrity": "sha512-hU30BK9IUN/su0Mn9VdlVKsWBS6GyhVfqjwl1FjZN4TxP6cCw0jP2w7V3Hf5uX7M0AZJ16vey9yE0ny7Sa59ZA==",
+      "license": "MIT",
+      "dependencies": {
+        "pako": "^1.0.6"
+      }
+    },
+    "node_modules/@pdf-lib/upng": {
+      "version": "1.0.1",
+      "resolved": "https://registry.npmjs.org/@pdf-lib/upng/-/upng-1.0.1.tgz",
+      "integrity": "sha512-dQK2FUMQtowVP00mtIksrlZhdFXQZPC+taih1q4CvPZ5vqdxR/LKBaFg0oAfzd1GlHZXXSPdQfzQnt+ViGvEIQ==",
+      "license": "MIT",
+      "dependencies": {
+        "pako": "^1.0.10"
+      }
+    },
     "node_modules/@rolldown/pluginutils": {
       "version": "1.0.0-beta.27",
       "resolved": "https://registry.npmjs.org/@rolldown/pluginutils/-/pluginutils-1.0.0-beta.27.tgz",
@@ -1517,6 +1529,16 @@
         "node": ">=20.0.0"
       }
     },
+    "node_modules/@svgdotjs/svg.js": {
+      "version": "3.2.0",
+      "resolved": "https://registry.npmjs.org/@svgdotjs/svg.js/-/svg.js-3.2.0.tgz",
+      "integrity": "sha512-Tr8p+QVP7y+QT1GBlq1Tt57IvedVH8zCPoYxdHLX0Oof3a/PqnC/tXAkVufv1JQJfsDHlH/UrjcDfgxSofqSNA==",
+      "license": "MIT",
+      "funding": {
+        "type": "github",
+        "url": "https://github.com/sponsors/Fuzzyma"
+      }
+    },
     "node_modules/@types/babel__core": {
       "version": "7.20.5",
       "resolved": "https://registry.npmjs.org/@types/babel__core/-/babel__core-7.20.5.tgz",
@@ -1562,27 +1584,6 @@
         "@babel/types": "^7.28.2"
       }
     },
-    "node_modules/@types/d3-scale": {
-      "version": "4.0.9",
-      "resolved": "https://registry.npmjs.org/@types/d3-scale/-/d3-scale-4.0.9.tgz",
-      "integrity": "sha512-dLmtwB8zkAeO/juAMfnV+sItKjlsw2lKdZVVy6LRr0cBmegxSABiLEpGVmSJJ8O08i4+sGR6qQtb6WtuwJdvVw==",
-      "license": "MIT",
-      "dependencies": {
-        "@types/d3-time": "*"
-      }
-    },
-    "node_modules/@types/d3-scale-chromatic": {
-      "version": "3.1.0",
-      "resolved": "https://registry.npmjs.org/@types/d3-scale-chromatic/-/d3-scale-chromatic-3.1.0.tgz",
-      "integrity": "sha512-iWMJgwkK7yTRmWqRB5plb1kadXyQ5Sj8V/zYlFGMUBbIPKQScw+Dku9cAAMgJG+z5GYDoMjWGLVOvjghDEFnKQ==",
-      "license": "MIT"
-    },
-    "node_modules/@types/d3-time": {
-      "version": "3.0.4",
-      "resolved": "https://registry.npmjs.org/@types/d3-time/-/d3-time-3.0.4.tgz",
-      "integrity": "sha512-yuzZug1nkAAaBlBBikKZTgzCeA+k1uy4ZFwWANOfKw5z5LRhV0gNA7gNkKm7HoK+HRN0wX3EkxGk0fpbWhmB7g==",
-      "license": "MIT"
-    },
     "node_modules/@types/debug": {
       "version": "4.1.12",
       "resolved": "https://registry.npmjs.org/@types/debug/-/debug-4.1.12.tgz",
@@ -1672,13 +1673,6 @@
         "@types/react": "^18.0.0"
       }
     },
-    "node_modules/@types/trusted-types": {
-      "version": "2.0.7",
-      "resolved": "https://registry.npmjs.org/@types/trusted-types/-/trusted-types-2.0.7.tgz",
-      "integrity": "sha512-ScaPdn1dQczgbl0QFTeTOmVHFULt394XJgOQNoyVhZ6r2vLnMLJfBPd53SB52T/3G36VI1/g2MZaX0cwDuXsfw==",
-      "license": "MIT",
-      "optional": true
-    },
     "node_modules/@types/unist": {
       "version": "2.0.11",
       "resolved": "https://registry.npmjs.org/@types/unist/-/unist-2.0.11.tgz",
@@ -1721,6 +1715,39 @@
         "vite": "^4.2.0 || ^5.0.0 || ^6.0.0 || ^7.0.0"
       }
     },
+    "node_modules/acorn": {
+      "version": "6.4.2",
+      "resolved": "https://registry.npmjs.org/acorn/-/acorn-6.4.2.tgz",
+      "integrity": "sha512-XtGIhXwF8YM8bJhGxG5kXgjkEuNGLTkoYqVE+KMR+aspr4KGYmKYg7yUe3KghyQ9yheNwLnjmzh/7+gfDBmHCQ==",
+      "license": "MIT",
+      "bin": {
+        "acorn": "bin/acorn"
+      },
+      "engines": {
+        "node": ">=0.4.0"
+      }
+    },
+    "node_modules/acorn-loose": {
+      "version": "6.1.0",
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+      "version": "5.1.2",
+      "resolved": "https://registry.npmjs.org/safe-buffer/-/safe-buffer-5.1.2.tgz",
+      "integrity": "sha512-Gd2UZBJDkXlY7GbJxfsE8/nvKkUEU1G38c1siN6QP6a9PT9MmHB8GnpscSmMJSoF8LOIrt8ud/wPtojys4G6+g==",
       "license": "MIT"
     },
+    "node_modules/sax": {
+      "version": "1.6.0",
+      "resolved": "https://registry.npmjs.org/sax/-/sax-1.6.0.tgz",
+      "integrity": "sha512-6R3J5M4AcbtLUdZmRv2SygeVaM7IhrLXu9BmnOGmmACak8fiUtOsYNWUS4uK7upbmHIBbLBeFeI//477BKLBzA==",
+      "license": "BlueOak-1.0.0",
+      "engines": {
+        "node": ">=11.0.0"
+      }
+    },
     "node_modules/scheduler": {
       "version": "0.23.2",
       "resolved": "https://registry.npmjs.org/scheduler/-/scheduler-0.23.2.tgz",
@@ -6848,6 +6712,98 @@
         "semver": "bin/semver.js"
       }
     },
+    "node_modules/setimmediate": {
+      "version": "1.0.5",
+      "resolved": "https://registry.npmjs.org/setimmediate/-/setimmediate-1.0.5.tgz",
+      "integrity": "sha512-MATJdZp8sLqDl/68LfQmbP8zKPLQNV6BIZoIgrscFDQ+RsvK/BxeDQOgyxKKoh0y/8h3BqVFnCqQ/gd+reiIXA==",
+      "license": "MIT"
+    },
+    "node_modules/simple-mind-map": {
+      "version": "0.14.0-fix.2",
+      "resolved": "https://registry.npmjs.org/simple-mind-map/-/simple-mind-map-0.14.0-fix.2.tgz",
+      "integrity": "sha512-31EWUozONl7Nn8b2Idf6UdPcAGtS8prVBjz/j0TZ9/zJcvmcEaJd1utX4sI/DGrr0ZW51ZNrfk09dYYCMaG7AA==",
+      "license": "MIT",
+      "dependencies": {
+        "@svgdotjs/svg.js": "3.2.0",
+        "deepmerge": "^1.5.2",
+        "eventemitter3": "^4.0.7",
+        "jszip": "^3.10.1",
+        "katex": "^0.16.8",
+        "mdast-util-from-markdown": "^1.3.0",
+        "pdf-lib": "^1.17.1",
+        "quill": "^2.0.3",
+        "tern": "^0.24.3",
+        "uuid": "^9.0.0",
+        "ws": "^7.5.9",
+        "xml-js": "^1.6.11",
+        "y-webrtc": "^10.2.5",
+        "yjs": "^13.6.8"
+      }
+    },
+    "node_modules/simple-mind-map/node_modules/ws": {
+      "version": "7.5.10",
+      "resolved": "https://registry.npmjs.org/ws/-/ws-7.5.10.tgz",
+      "integrity": "sha512-+dbF1tHwZpXcbOJdVOkzLDxZP1ailvSxM6ZweXTegylPny803bFhA+vqBYw4s31NSAk4S2Qz+AKXK9a4wkdjcQ==",
+      "license": "MIT",
+      "engines": {
+        "node": ">=8.3.0"
+      },
+      "peerDependencies": {
+        "bufferutil": "^4.0.1",
+        "utf-8-validate": "^5.0.2"
+      },
+      "peerDependenciesMeta": {
+        "bufferutil": {
+          "optional": true
+        },
+        "utf-8-validate": {
+          "optional": true
+        }
+      }
+    },
+    "node_modules/simple-peer": {
+      "version": "9.11.1",
+      "resolved": "https://registry.npmjs.org/simple-peer/-/simple-peer-9.11.1.tgz",
+      "integrity": "sha512-D1SaWpOW8afq1CZGWB8xTfrT3FekjQmPValrqncJMX7QFl8YwhrPTZvMCANLtgBwwdS+7zURyqxDDEmY558tTw==",
+      "funding": [
+        {
+          "type": "github",
+          "url": "https://github.com/sponsors/feross"
+        },
+        {
+          "type": "patreon",
+          "url": "https://www.patreon.com/feross"
+        },
+        {
+          "type": "consulting",
+          "url": "https://feross.org/support"
+        }
+      ],
+      "license": "MIT",
+      "dependencies": {
+        "buffer": "^6.0.3",
+        "debug": "^4.3.2",
+        "err-code": "^3.0.1",
+        "get-browser-rtc": "^1.1.0",
+        "queue-microtask": "^1.2.3",
+        "randombytes": "^2.1.0",
+        "readable-stream": "^3.6.0"
+      }
+    },
+    "node_modules/simple-peer/node_modules/readable-stream": {
+      "version": "3.6.2",
+      "resolved": "https://registry.npmjs.org/readable-stream/-/readable-stream-3.6.2.tgz",
+      "integrity": "sha512-9u/sniCrY3D5WdsERHzHE4G2YCXqoG5FTHUiCC4SIbr6XcLZBY05ya9EKjYek9O5xOAwjGq+1JdGBAS7Q9ScoA==",
+      "license": "MIT",
+      "dependencies": {
+        "inherits": "^2.0.3",
+        "string_decoder": "^1.1.1",
+        "util-deprecate": "^1.0.1"
+      },
+      "engines": {
+        "node": ">= 6"
+      }
+    },
     "node_modules/source-map-js": {
       "version": "1.2.1",
       "resolved": "https://registry.npmjs.org/source-map-js/-/source-map-js-1.2.1.tgz",
@@ -6868,6 +6824,15 @@
         "url": "https://github.com/sponsors/wooorm"
       }
     },
+    "node_modules/string_decoder": {
+      "version": "1.1.1",
+      "resolved": "https://registry.npmjs.org/string_decoder/-/string_decoder-1.1.1.tgz",
+      "integrity": "sha512-n/ShnvDi6FHbbVfviro+WojiFzv+s8MPMHBczVePfUpDJLwoLT0ht1l4YwBCbi8pJAveEEdnkHyPyTP/mzRfwg==",
+      "license": "MIT",
+      "dependencies": {
+        "safe-buffer": "~5.1.0"
+      }
+    },
     "node_modules/stringify-entities": {
       "version": "4.0.4",
       "resolved": "https://registry.npmjs.org/stringify-entities/-/stringify-entities-4.0.4.tgz",
@@ -6900,12 +6865,6 @@
         "inline-style-parser": "0.2.7"
       }
     },
-    "node_modules/stylis": {
-      "version": "4.3.6",
-      "resolved": "https://registry.npmjs.org/stylis/-/stylis-4.3.6.tgz",
-      "integrity": "sha512-yQ3rwFWRfwNUY7H5vpU0wfdkNSnvnJinhF9830Swlaxl03zsOjCfmX0ugac+3LtK0lYSgwL/KXc8oYL3mG4YFQ==",
-      "license": "MIT"
-    },
     "node_modules/sucrase": {
       "version": "3.35.1",
       "resolved": "https://registry.npmjs.org/sucrase/-/sucrase-3.35.1.tgz",
@@ -7000,6 +6959,33 @@
         "node": ">=14.0.0"
       }
     },
+    "node_modules/tapable": {
+      "version": "0.2.9",
+      "resolved": "https://registry.npmjs.org/tapable/-/tapable-0.2.9.tgz",
+      "integrity": "sha512-2wsvQ+4GwBvLPLWsNfLCDYGsW6xb7aeC6utq2Qh0PFwgEy7K7dsma9Jsmb2zSQj7GvYAyUGSntLtsv++GmgL1A==",
+      "license": "MIT",
+      "engines": {
+        "node": ">=0.6"
+      }
+    },
+    "node_modules/tern": {
+      "version": "0.24.3",
+      "resolved": "https://registry.npmjs.org/tern/-/tern-0.24.3.tgz",
+      "integrity": "sha512-Z8uvtdWIlFn1GWy0HW5FhZ8VDryZwoJUdnjZU25C7/PBOltLIn1uv+WF3rVq6S1761YbsmbZYRP/l0ZJBCkvrw==",
+      "license": "MIT",
+      "dependencies": {
+        "acorn": "^6.0.0",
+        "acorn-loose": "^6.0.0",
+        "acorn-walk": "^6.0.0",
+        "enhanced-resolve": "^2.2.2",
+        "glob": "^7.1.1",
+        "minimatch": "^3.0.3",
+        "resolve-from": "2.0.0"
+      },
+      "bin": {
+        "tern": "bin/tern"
+      }
+    },
     "node_modules/thenify": {
       "version": "3.3.1",
       "resolved": "https://registry.npmjs.org/thenify/-/thenify-3.3.1.tgz",
@@ -7110,15 +7096,6 @@
         "url": "https://github.com/sponsors/wooorm"
       }
     },
-    "node_modules/ts-dedent": {
-      "version": "2.2.0",
-      "resolved": "https://registry.npmjs.org/ts-dedent/-/ts-dedent-2.2.0.tgz",
-      "integrity": "sha512-q5W7tVM71e2xjHZTlgfTDoPF/SmqKG5hddq9SzR49CH2hayqRKJtQ4mtRlSxKaJlR/+9rEM+mnBHf7I2/BQcpQ==",
-      "license": "MIT",
-      "engines": {
-        "node": ">=6.10"
-      }
-    },
     "node_modules/ts-interface-checker": {
       "version": "0.1.13",
       "resolved": "https://registry.npmjs.org/ts-interface-checker/-/ts-interface-checker-0.1.13.tgz",
@@ -7313,7 +7290,6 @@
       "version": "1.0.2",
       "resolved": "https://registry.npmjs.org/util-deprecate/-/util-deprecate-1.0.2.tgz",
       "integrity": "sha512-EPD5q1uXyFxJpCrLnCc1nHnq3gOa6DZBocAIiI2TaSCA7VCJ1UJDMagCzIkXNsUYfD1daK//LTEQ8xiIbrHtcw==",
-      "dev": true,
       "license": "MIT"
     },
     "node_modules/uuid": {
@@ -7469,11 +7445,11 @@
         "loose-envify": "^1.0.0"
       }
     },
-    "node_modules/web-worker": {
-      "version": "1.5.0",
-      "resolved": "https://registry.npmjs.org/web-worker/-/web-worker-1.5.0.tgz",
-      "integrity": "sha512-RiMReJrTAiA+mBjGONMnjVDP2u3p9R1vkcGz6gDIrOMT3oGuYwX2WRMYI9ipkphSuE5XKEhydbhNEJh4NY9mlw==",
-      "license": "Apache-2.0"
+    "node_modules/wrappy": {
+      "version": "1.0.2",
+      "resolved": "https://registry.npmjs.org/wrappy/-/wrappy-1.0.2.tgz",
+      "integrity": "sha512-l4Sp/DRseor9wL6EvV2+TuQn63dMkPjZ/sp9XkghTEbV9KlPS1xUsZ3u7/IQO4wxtcFB4bgpQPRcR3QCvezPcQ==",
+      "license": "ISC"
     },
     "node_modules/ws": {
       "version": "8.19.0",
@@ -7496,6 +7472,65 @@
         }
       }
     },
+    "node_modules/xml-js": {
+      "version": "1.6.11",
+      "resolved": "https://registry.npmjs.org/xml-js/-/xml-js-1.6.11.tgz",
+      "integrity": "sha512-7rVi2KMfwfWFl+GpPg6m80IVMWXLRjO+PxTq7V2CDhoGak0wzYzFgUY2m4XJ47OGdXd8eLE8EmwfAmdjw7lC1g==",
+      "license": "MIT",
+      "dependencies": {
+        "sax": "^1.2.4"
+      },
+      "bin": {
+        "xml-js": "bin/cli.js"
+      }
+    },
+    "node_modules/y-protocols": {
+      "version": "1.0.7",
+      "resolved": "https://registry.npmjs.org/y-protocols/-/y-protocols-1.0.7.tgz",
+      "integrity": "sha512-YSVsLoXxO67J6eE/nV4AtFtT3QEotZf5sK5BHxFBXso7VDUT3Tx07IfA6hsu5Q5OmBdMkQVmFZ9QOA7fikWvnw==",
+      "license": "MIT",
+      "dependencies": {
+        "lib0": "^0.2.85"
+      },
+      "engines": {
+        "node": ">=16.0.0",
+        "npm": ">=8.0.0"
+      },
+      "funding": {
+        "type": "GitHub Sponsors ❤",
+        "url": "https://github.com/sponsors/dmonad"
+      },
+      "peerDependencies": {
+        "yjs": "^13.0.0"
+      }
+    },
+    "node_modules/y-webrtc": {
+      "version": "10.3.0",
+      "resolved": "https://registry.npmjs.org/y-webrtc/-/y-webrtc-10.3.0.tgz",
+      "integrity": "sha512-KalJr7dCgUgyVFxoG3CQYbpS0O2qybegD0vI4bYnYHI0MOwoVbucED3RZ5f2o1a5HZb1qEssUKS0H/Upc6p1lA==",
+      "license": "MIT",
+      "dependencies": {
+        "lib0": "^0.2.42",
+        "simple-peer": "^9.11.0",
+        "y-protocols": "^1.0.6"
+      },
+      "bin": {
+        "y-webrtc-signaling": "bin/server.js"
+      },
+      "engines": {
+        "node": ">=12"
+      },
+      "funding": {
+        "type": "GitHub Sponsors ❤",
+        "url": "https://github.com/sponsors/dmonad"
+      },
+      "optionalDependencies": {
+        "ws": "^8.14.2"
+      },
+      "peerDependencies": {
+        "yjs": "^13.6.8"
+      }
+    },
     "node_modules/yallist": {
       "version": "3.1.1",
       "resolved": "https://registry.npmjs.org/yallist/-/yallist-3.1.1.tgz",
@@ -7503,6 +7538,23 @@
       "dev": true,
       "license": "ISC"
     },
+    "node_modules/yjs": {
+      "version": "13.6.30",
+      "resolved": "https://registry.npmjs.org/yjs/-/yjs-13.6.30.tgz",
+      "integrity": "sha512-vv/9h42eCMC81ZHDFswuu/MKzkl/vyq1BhaNGfHyOonwlG4CJbQF4oiBBJPvfdeCt/PlVDWh7Nov9D34YY09uQ==",
+      "license": "MIT",
+      "dependencies": {
+        "lib0": "^0.2.99"
+      },
+      "engines": {
+        "node": ">=16.0.0",
+        "npm": ">=8.0.0"
+      },
+      "funding": {
+        "type": "GitHub Sponsors ❤",
+        "url": "https://github.com/sponsors/dmonad"
+      }
+    },
     "node_modules/zustand": {
       "version": "4.5.7",
       "resolved": "https://registry.npmjs.org/zustand/-/zustand-4.5.7.tgz",
diff --git a/frontend_en/package.json b/frontend_en/package.json
index b6d9db4..a28bdda 100644
--- a/frontend_en/package.json
+++ b/frontend_en/package.json
@@ -14,12 +14,12 @@
     "framer-motion": "^10.16.4",
     "katex": "^0.16.28",
     "lucide-react": "^0.294.0",
-    "mermaid": "^10.6.1",
     "pdfjs-dist": "^5.4.296",
     "react": "^18.2.0",
     "react-dom": "^18.2.0",
     "react-markdown": "^9.1.0",
     "react-pdf": "^10.3.0",
+    "simple-mind-map": "^0.14.0-fix.2",
     "tailwind-merge": "^2.0.0",
     "zustand": "^4.4.7"
   },
diff --git a/frontend_en/src/types/simple-mind-map.d.ts b/frontend_en/src/types/simple-mind-map.d.ts
new file mode 100644
index 0000000..fa2911a
--- /dev/null
+++ b/frontend_en/src/types/simple-mind-map.d.ts
@@ -0,0 +1,76 @@
+declare module 'simple-mind-map' {
+  interface MindMapData {
+    data: {
+      text: string;
+      [key: string]: any;
+    };
+    children?: MindMapData[];
+  }
+
+  interface MindMapOptions {
+    el: HTMLElement;
+    data?: MindMapData;
+    theme?: string;
+    layout?: string;
+    scaleRatio?: number;
+    minZoomRatio?: number;
+    maxZoomRatio?: number;
+    readonly?: boolean;
+    enableFreeDrag?: boolean;
+    [key: string]: any;
+  }
+
+  interface MindMapNode {
+    data: { text: string; [key: string]: any };
+    children?: MindMapNode[];
+    nodeData: MindMapData;
+    [key: string]: any;
+  }
+
+  interface MindMapView {
+    enlarge(cx?: number, cy?: number): void;
+    narrow(cx?: number, cy?: number): void;
+    setScale(scale: number, cx?: number, cy?: number): void;
+    fit(): void;
+    reset(): void;
+    translateXY(x: number, y: number): void;
+    getTransformData(): { state: { scale: number; x: number; y: number } };
+    setTransformData(data: { state: { scale: number; x: number; y: number } }): void;
+  }
+
+  class MindMap {
+    constructor(options: MindMapOptions);
+
+    static usePlugin(plugin: any): typeof MindMap;
+    static defineTheme(name: string, config: Record<string, any>): void;
+
+    view: MindMapView;
+
+    setData(data: MindMapData): void;
+    setTheme(theme: string): void;
+    setThemeConfig(config: Record<string, any>): void;
+    setLayout(layout: string): void;
+    execCommand(command: string, ...args: any[]): void;
+    export(
+      type: 'png' | 'jpg' | 'svg' | 'json' | 'pdf' | 'smm' | 'md' | 'txt',
+      isDownload?: boolean,
+      fileName?: string,
+      ...args: any[]
+    ): Promise<any> | any;
+    on(event: string, callback: (...args: any[]) => void): void;
+    off(event: string, callback: (...args: any[]) => void): void;
+    destroy(): void;
+  }
+
+  export default MindMap;
+}
+
+declare module 'simple-mind-map/src/plugins/Export.js' {
+  const Export: any;
+  export default Export;
+}
+
+declare module 'simple-mind-map/src/parse/markdown.js' {
+  export function transformMarkdownTo(markdown: string): any;
+  export function transformToMarkdown(data: any): string;
+}
diff --git a/frontend_en/src/utils/mermaidToMarkdown.ts b/frontend_en/src/utils/mermaidToMarkdown.ts
new file mode 100644
index 0000000..e00ade1
--- /dev/null
+++ b/frontend_en/src/utils/mermaidToMarkdown.ts
@@ -0,0 +1,124 @@
+/**
+ * Convert Mermaid mindmap syntax to Markdown headings format.
+ * Used as fallback for legacy .mmd files.
+ *
+ * Input example:
+ *   mindmap
+ *     root((Central Topic))
+ *       Topic 1
+ *         Sub 1.1
+ *       Topic 2
+ *
+ * Output:
+ *   # Central Topic
+ *   ## Topic 1
+ *   ### Sub 1.1
+ *   ## Topic 2
+ */
+
+function stripShapeDecorators(text: string): string {
+  return text
+    .replace(/^\(\((.+?)\)\)$/, '$1')
+    .replace(/^\((.+?)\)$/, '$1')
+    .replace(/^\[(.+?)\]$/, '$1')
+    .replace(/^\{\{(.+?)\}\}$/, '$1')
+    .replace(/^\)(.+?)\($/, '$1')
+    .replace(/^>(.+?)\]$/, '$1');
+}
+
+export function mermaidToMarkdown(mermaidCode: string): string {
+  const lines = mermaidCode.split('\n');
+  const result: string[] = [];
+  let baseIndent = -1;
+  let indentUnit = 2;
+
+  for (const line of lines) {
+    const trimmed = line.trimEnd();
+    if (!trimmed || trimmed.trim() === 'mindmap') continue;
+
+    const indent = line.length - line.trimStart().length;
+    let text = trimmed.trim();
+
+    // Handle root line
+    if (text.startsWith('root')) {
+      text = text.replace(/^root\s*/, '').trim();
+      text = stripShapeDecorators(text);
+      baseIndent = indent;
+      result.push(`# ${text}`);
+      continue;
+    }
+
+    // Detect indent unit from first non-root indented line
+    if (baseIndent >= 0 && indent > baseIndent && indentUnit === 2) {
+      indentUnit = indent - baseIndent;
+    }
+
+    text = stripShapeDecorators(text);
+
+    const depth = Math.max(1, Math.floor((indent - baseIndent) / indentUnit) + 1);
+    const hashes = '#'.repeat(Math.min(depth, 6));
+    result.push(`${hashes} ${text}`);
+  }
+
+  return result.join('\n');
+}
+
+/**
+ * Detect if the input is Mermaid mindmap syntax (vs already Markdown).
+ */
+export function isMermaidMindmap(code: string): boolean {
+  const trimmed = code.trimStart();
+  return trimmed.startsWith('mindmap');
+}
+
+/**
+ * Convert Markdown headings to Mermaid mindmap syntax.
+ *
+ * Input:
+ *   # Central Topic
+ *   ## Topic 1
+ *   ### Sub 1.1
+ *
+ * Output:
+ *   mindmap
+ *     root((Central Topic))
+ *       Topic 1
+ *         Sub 1.1
+ */
+let _nodeIdCounter = 0;
+
+function needsEscape(text: string): boolean {
+  return /[()[\]{}<>"'/\\,;:!?]/.test(text);
+}
+
+export function markdownToMermaid(markdown: string): string {
+  _nodeIdCounter = 0;
+  const lines = markdown.split('\n');
+  const result: string[] = ['mindmap'];
+
+  for (const line of lines) {
+    const match = line.match(/^(#{1,6})\s+(.+)/);
+    if (!match) continue;
+
+    const depth = match[1].length;
+    const text = match[2].trim();
+    const indent = '  '.repeat(depth);
+
+    if (depth === 1) {
+      // Root node: use round shape
+      if (needsEscape(text)) {
+        result.push(`${indent}root["${text}"]`);
+      } else {
+        result.push(`${indent}root(${text})`);
+      }
+    } else if (needsEscape(text)) {
+      // Nodes with special chars: use id["text"] syntax
+      const id = `n${++_nodeIdCounter}`;
+      result.push(`${indent}${id}["${text}"]`);
+    } else {
+      result.push(`${indent}${text}`);
+    }
+  }
+
+  return result.join('\n');
+}
diff --git a/frontend_zh/package-lock.json b/frontend_zh/package-lock.json
index 873bc08..7ca7edd 100644
--- a/frontend_zh/package-lock.json
+++ b/frontend_zh/package-lock.json
@@ -13,12 +13,12 @@
         "framer-motion": "^10.16.4",
         "katex": "^0.16.28",
         "lucide-react": "^0.294.0",
-        "mermaid": "^10.6.1",
         "pdfjs-dist": "^5.4.296",
         "react": "^18.2.0",
         "react-dom": "^18.2.0",
         "react-markdown": "^9.1.0",
         "react-pdf": "^10.3.0",
+        "simple-mind-map": "^0.14.0-fix.2",
         "tailwind-merge": "^2.0.0",
         "zustand": "^4.4.7"
       },
@@ -328,12 +328,6 @@
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+      "dependencies": {
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+        "lodash-es": "^4.17.21",
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+      "license": "MIT",
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+        "fast-diff": "^1.3.0",
+        "lodash.clonedeep": "^4.5.0",
+        "lodash.isequal": "^4.5.0"
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+      "engines": {
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+      "resolved": "https://registry.npmjs.org/eventemitter3/-/eventemitter3-5.0.4.tgz",
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+      "license": "MIT"
+    },
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+      "license": "MIT",
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@@ -6136,6 +5979,21 @@
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+    "node_modules/readable-stream": {
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+      "resolved": "https://registry.npmjs.org/readable-stream/-/readable-stream-2.3.8.tgz",
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+      "license": "MIT",
+      "dependencies": {
+        "core-util-is": "~1.0.0",
+        "inherits": "~2.0.3",
+        "isarray": "~1.0.0",
+        "process-nextick-args": "~2.0.0",
+        "safe-buffer": "~5.1.1",
+        "string_decoder": "~1.1.1",
+        "util-deprecate": "~1.0.1"
+      }
+    },
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@@ -6719,6 +6577,15 @@
         "url": "https://github.com/sponsors/ljharb"
       }
     },
+    "node_modules/resolve-from": {
+      "version": "2.0.0",
+      "resolved": "https://registry.npmjs.org/resolve-from/-/resolve-from-2.0.0.tgz",
+      "integrity": "sha512-qpFcKaXsq8+oRoLilkwyc7zHGF5i9Q2/25NIgLQQ/+VVv9rU4qvr6nXVAw1DsnXJyQkZsR4Ytfbtg5ehfcUssQ==",
+      "license": "MIT",
+      "engines": {
+        "node": ">=0.10.0"
+      }
+    },
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       "version": "1.1.0",
       "resolved": "https://registry.npmjs.org/reusify/-/reusify-1.1.0.tgz",
@@ -6730,12 +6597,6 @@
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@@ -6805,12 +6666,6 @@
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@@ -6823,12 +6678,21 @@
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+    "node_modules/safe-buffer": {
+      "version": "5.1.2",
+      "resolved": "https://registry.npmjs.org/safe-buffer/-/safe-buffer-5.1.2.tgz",
+      "integrity": "sha512-Gd2UZBJDkXlY7GbJxfsE8/nvKkUEU1G38c1siN6QP6a9PT9MmHB8GnpscSmMJSoF8LOIrt8ud/wPtojys4G6+g==",
       "license": "MIT"
     },
+    "node_modules/sax": {
+      "version": "1.6.0",
+      "resolved": "https://registry.npmjs.org/sax/-/sax-1.6.0.tgz",
+      "integrity": "sha512-6R3J5M4AcbtLUdZmRv2SygeVaM7IhrLXu9BmnOGmmACak8fiUtOsYNWUS4uK7upbmHIBbLBeFeI//477BKLBzA==",
+      "license": "BlueOak-1.0.0",
+      "engines": {
+        "node": ">=11.0.0"
+      }
+    },
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       "version": "0.23.2",
       "resolved": "https://registry.npmjs.org/scheduler/-/scheduler-0.23.2.tgz",
@@ -6848,6 +6712,98 @@
         "semver": "bin/semver.js"
       }
     },
+    "node_modules/setimmediate": {
+      "version": "1.0.5",
+      "resolved": "https://registry.npmjs.org/setimmediate/-/setimmediate-1.0.5.tgz",
+      "integrity": "sha512-MATJdZp8sLqDl/68LfQmbP8zKPLQNV6BIZoIgrscFDQ+RsvK/BxeDQOgyxKKoh0y/8h3BqVFnCqQ/gd+reiIXA==",
+      "license": "MIT"
+    },
+    "node_modules/simple-mind-map": {
+      "version": "0.14.0-fix.2",
+      "resolved": "https://registry.npmjs.org/simple-mind-map/-/simple-mind-map-0.14.0-fix.2.tgz",
+      "integrity": "sha512-31EWUozONl7Nn8b2Idf6UdPcAGtS8prVBjz/j0TZ9/zJcvmcEaJd1utX4sI/DGrr0ZW51ZNrfk09dYYCMaG7AA==",
+      "license": "MIT",
+      "dependencies": {
+        "@svgdotjs/svg.js": "3.2.0",
+        "deepmerge": "^1.5.2",
+        "eventemitter3": "^4.0.7",
+        "jszip": "^3.10.1",
+        "katex": "^0.16.8",
+        "mdast-util-from-markdown": "^1.3.0",
+        "pdf-lib": "^1.17.1",
+        "quill": "^2.0.3",
+        "tern": "^0.24.3",
+        "uuid": "^9.0.0",
+        "ws": "^7.5.9",
+        "xml-js": "^1.6.11",
+        "y-webrtc": "^10.2.5",
+        "yjs": "^13.6.8"
+      }
+    },
+    "node_modules/simple-mind-map/node_modules/ws": {
+      "version": "7.5.10",
+      "resolved": "https://registry.npmjs.org/ws/-/ws-7.5.10.tgz",
+      "integrity": "sha512-+dbF1tHwZpXcbOJdVOkzLDxZP1ailvSxM6ZweXTegylPny803bFhA+vqBYw4s31NSAk4S2Qz+AKXK9a4wkdjcQ==",
+      "license": "MIT",
+      "engines": {
+        "node": ">=8.3.0"
+      },
+      "peerDependencies": {
+        "bufferutil": "^4.0.1",
+        "utf-8-validate": "^5.0.2"
+      },
+      "peerDependenciesMeta": {
+        "bufferutil": {
+          "optional": true
+        },
+        "utf-8-validate": {
+          "optional": true
+        }
+      }
+    },
+    "node_modules/simple-peer": {
+      "version": "9.11.1",
+      "resolved": "https://registry.npmjs.org/simple-peer/-/simple-peer-9.11.1.tgz",
+      "integrity": "sha512-D1SaWpOW8afq1CZGWB8xTfrT3FekjQmPValrqncJMX7QFl8YwhrPTZvMCANLtgBwwdS+7zURyqxDDEmY558tTw==",
+      "funding": [
+        {
+          "type": "github",
+          "url": "https://github.com/sponsors/feross"
+        },
+        {
+          "type": "patreon",
+          "url": "https://www.patreon.com/feross"
+        },
+        {
+          "type": "consulting",
+          "url": "https://feross.org/support"
+        }
+      ],
+      "license": "MIT",
+      "dependencies": {
+        "buffer": "^6.0.3",
+        "debug": "^4.3.2",
+        "err-code": "^3.0.1",
+        "get-browser-rtc": "^1.1.0",
+        "queue-microtask": "^1.2.3",
+        "randombytes": "^2.1.0",
+        "readable-stream": "^3.6.0"
+      }
+    },
+    "node_modules/simple-peer/node_modules/readable-stream": {
+      "version": "3.6.2",
+      "resolved": "https://registry.npmjs.org/readable-stream/-/readable-stream-3.6.2.tgz",
+      "integrity": "sha512-9u/sniCrY3D5WdsERHzHE4G2YCXqoG5FTHUiCC4SIbr6XcLZBY05ya9EKjYek9O5xOAwjGq+1JdGBAS7Q9ScoA==",
+      "license": "MIT",
+      "dependencies": {
+        "inherits": "^2.0.3",
+        "string_decoder": "^1.1.1",
+        "util-deprecate": "^1.0.1"
+      },
+      "engines": {
+        "node": ">= 6"
+      }
+    },
     "node_modules/source-map-js": {
       "version": "1.2.1",
       "resolved": "https://registry.npmjs.org/source-map-js/-/source-map-js-1.2.1.tgz",
@@ -6868,6 +6824,15 @@
         "url": "https://github.com/sponsors/wooorm"
       }
     },
+    "node_modules/string_decoder": {
+      "version": "1.1.1",
+      "resolved": "https://registry.npmjs.org/string_decoder/-/string_decoder-1.1.1.tgz",
+      "integrity": "sha512-n/ShnvDi6FHbbVfviro+WojiFzv+s8MPMHBczVePfUpDJLwoLT0ht1l4YwBCbi8pJAveEEdnkHyPyTP/mzRfwg==",
+      "license": "MIT",
+      "dependencies": {
+        "safe-buffer": "~5.1.0"
+      }
+    },
     "node_modules/stringify-entities": {
       "version": "4.0.4",
       "resolved": "https://registry.npmjs.org/stringify-entities/-/stringify-entities-4.0.4.tgz",
@@ -6900,12 +6865,6 @@
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-      "resolved": "https://registry.npmjs.org/stylis/-/stylis-4.3.6.tgz",
-      "integrity": "sha512-yQ3rwFWRfwNUY7H5vpU0wfdkNSnvnJinhF9830Swlaxl03zsOjCfmX0ugac+3LtK0lYSgwL/KXc8oYL3mG4YFQ==",
-      "license": "MIT"
-    },
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       "resolved": "https://registry.npmjs.org/sucrase/-/sucrase-3.35.1.tgz",
@@ -7000,6 +6959,33 @@
         "node": ">=14.0.0"
       }
     },
+    "node_modules/tapable": {
+      "version": "0.2.9",
+      "resolved": "https://registry.npmjs.org/tapable/-/tapable-0.2.9.tgz",
+      "integrity": "sha512-2wsvQ+4GwBvLPLWsNfLCDYGsW6xb7aeC6utq2Qh0PFwgEy7K7dsma9Jsmb2zSQj7GvYAyUGSntLtsv++GmgL1A==",
+      "license": "MIT",
+      "engines": {
+        "node": ">=0.6"
+      }
+    },
+    "node_modules/tern": {
+      "version": "0.24.3",
+      "resolved": "https://registry.npmjs.org/tern/-/tern-0.24.3.tgz",
+      "integrity": "sha512-Z8uvtdWIlFn1GWy0HW5FhZ8VDryZwoJUdnjZU25C7/PBOltLIn1uv+WF3rVq6S1761YbsmbZYRP/l0ZJBCkvrw==",
+      "license": "MIT",
+      "dependencies": {
+        "acorn": "^6.0.0",
+        "acorn-loose": "^6.0.0",
+        "acorn-walk": "^6.0.0",
+        "enhanced-resolve": "^2.2.2",
+        "glob": "^7.1.1",
+        "minimatch": "^3.0.3",
+        "resolve-from": "2.0.0"
+      },
+      "bin": {
+        "tern": "bin/tern"
+      }
+    },
     "node_modules/thenify": {
       "version": "3.3.1",
       "resolved": "https://registry.npmjs.org/thenify/-/thenify-3.3.1.tgz",
@@ -7110,15 +7096,6 @@
         "url": "https://github.com/sponsors/wooorm"
       }
     },
-    "node_modules/ts-dedent": {
-      "version": "2.2.0",
-      "resolved": "https://registry.npmjs.org/ts-dedent/-/ts-dedent-2.2.0.tgz",
-      "integrity": "sha512-q5W7tVM71e2xjHZTlgfTDoPF/SmqKG5hddq9SzR49CH2hayqRKJtQ4mtRlSxKaJlR/+9rEM+mnBHf7I2/BQcpQ==",
-      "license": "MIT",
-      "engines": {
-        "node": ">=6.10"
-      }
-    },
     "node_modules/ts-interface-checker": {
       "version": "0.1.13",
       "resolved": "https://registry.npmjs.org/ts-interface-checker/-/ts-interface-checker-0.1.13.tgz",
@@ -7313,7 +7290,6 @@
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-      "dev": true,
       "license": "MIT"
     },
     "node_modules/uuid": {
@@ -7469,11 +7445,11 @@
         "loose-envify": "^1.0.0"
       }
     },
-    "node_modules/web-worker": {
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-      "resolved": "https://registry.npmjs.org/web-worker/-/web-worker-1.5.0.tgz",
-      "integrity": "sha512-RiMReJrTAiA+mBjGONMnjVDP2u3p9R1vkcGz6gDIrOMT3oGuYwX2WRMYI9ipkphSuE5XKEhydbhNEJh4NY9mlw==",
-      "license": "Apache-2.0"
+    "node_modules/wrappy": {
+      "version": "1.0.2",
+      "resolved": "https://registry.npmjs.org/wrappy/-/wrappy-1.0.2.tgz",
+      "integrity": "sha512-l4Sp/DRseor9wL6EvV2+TuQn63dMkPjZ/sp9XkghTEbV9KlPS1xUsZ3u7/IQO4wxtcFB4bgpQPRcR3QCvezPcQ==",
+      "license": "ISC"
     },
     "node_modules/ws": {
       "version": "8.19.0",
@@ -7496,6 +7472,65 @@
         }
       }
     },
+    "node_modules/xml-js": {
+      "version": "1.6.11",
+      "resolved": "https://registry.npmjs.org/xml-js/-/xml-js-1.6.11.tgz",
+      "integrity": "sha512-7rVi2KMfwfWFl+GpPg6m80IVMWXLRjO+PxTq7V2CDhoGak0wzYzFgUY2m4XJ47OGdXd8eLE8EmwfAmdjw7lC1g==",
+      "license": "MIT",
+      "dependencies": {
+        "sax": "^1.2.4"
+      },
+      "bin": {
+        "xml-js": "bin/cli.js"
+      }
+    },
+    "node_modules/y-protocols": {
+      "version": "1.0.7",
+      "resolved": "https://registry.npmjs.org/y-protocols/-/y-protocols-1.0.7.tgz",
+      "integrity": "sha512-YSVsLoXxO67J6eE/nV4AtFtT3QEotZf5sK5BHxFBXso7VDUT3Tx07IfA6hsu5Q5OmBdMkQVmFZ9QOA7fikWvnw==",
+      "license": "MIT",
+      "dependencies": {
+        "lib0": "^0.2.85"
+      },
+      "engines": {
+        "node": ">=16.0.0",
+        "npm": ">=8.0.0"
+      },
+      "funding": {
+        "type": "GitHub Sponsors ❤",
+        "url": "https://github.com/sponsors/dmonad"
+      },
+      "peerDependencies": {
+        "yjs": "^13.0.0"
+      }
+    },
+    "node_modules/y-webrtc": {
+      "version": "10.3.0",
+      "resolved": "https://registry.npmjs.org/y-webrtc/-/y-webrtc-10.3.0.tgz",
+      "integrity": "sha512-KalJr7dCgUgyVFxoG3CQYbpS0O2qybegD0vI4bYnYHI0MOwoVbucED3RZ5f2o1a5HZb1qEssUKS0H/Upc6p1lA==",
+      "license": "MIT",
+      "dependencies": {
+        "lib0": "^0.2.42",
+        "simple-peer": "^9.11.0",
+        "y-protocols": "^1.0.6"
+      },
+      "bin": {
+        "y-webrtc-signaling": "bin/server.js"
+      },
+      "engines": {
+        "node": ">=12"
+      },
+      "funding": {
+        "type": "GitHub Sponsors ❤",
+        "url": "https://github.com/sponsors/dmonad"
+      },
+      "optionalDependencies": {
+        "ws": "^8.14.2"
+      },
+      "peerDependencies": {
+        "yjs": "^13.6.8"
+      }
+    },
     "node_modules/yallist": {
       "version": "3.1.1",
       "resolved": "https://registry.npmjs.org/yallist/-/yallist-3.1.1.tgz",
@@ -7503,6 +7538,23 @@
       "dev": true,
       "license": "ISC"
     },
+    "node_modules/yjs": {
+      "version": "13.6.30",
+      "resolved": "https://registry.npmjs.org/yjs/-/yjs-13.6.30.tgz",
+      "integrity": "sha512-vv/9h42eCMC81ZHDFswuu/MKzkl/vyq1BhaNGfHyOonwlG4CJbQF4oiBBJPvfdeCt/PlVDWh7Nov9D34YY09uQ==",
+      "license": "MIT",
+      "dependencies": {
+        "lib0": "^0.2.99"
+      },
+      "engines": {
+        "node": ">=16.0.0",
+        "npm": ">=8.0.0"
+      },
+      "funding": {
+        "type": "GitHub Sponsors ❤",
+        "url": "https://github.com/sponsors/dmonad"
+      }
+    },
     "node_modules/zustand": {
       "version": "4.5.7",
       "resolved": "https://registry.npmjs.org/zustand/-/zustand-4.5.7.tgz",
diff --git a/frontend_zh/package.json b/frontend_zh/package.json
index b6d9db4..a28bdda 100644
--- a/frontend_zh/package.json
+++ b/frontend_zh/package.json
@@ -14,12 +14,12 @@
     "framer-motion": "^10.16.4",
     "katex": "^0.16.28",
     "lucide-react": "^0.294.0",
-    "mermaid": "^10.6.1",
     "pdfjs-dist": "^5.4.296",
     "react": "^18.2.0",
     "react-dom": "^18.2.0",
     "react-markdown": "^9.1.0",
     "react-pdf": "^10.3.0",
+    "simple-mind-map": "^0.14.0-fix.2",
     "tailwind-merge": "^2.0.0",
     "zustand": "^4.4.7"
   },
diff --git a/frontend_zh/src/types/simple-mind-map.d.ts b/frontend_zh/src/types/simple-mind-map.d.ts
new file mode 100644
index 0000000..fa2911a
--- /dev/null
+++ b/frontend_zh/src/types/simple-mind-map.d.ts
@@ -0,0 +1,76 @@
+declare module 'simple-mind-map' {
+  interface MindMapData {
+    data: {
+      text: string;
+      [key: string]: any;
+    };
+    children?: MindMapData[];
+  }
+
+  interface MindMapOptions {
+    el: HTMLElement;
+    data?: MindMapData;
+    theme?: string;
+    layout?: string;
+    scaleRatio?: number;
+    minZoomRatio?: number;
+    maxZoomRatio?: number;
+    readonly?: boolean;
+    enableFreeDrag?: boolean;
+    [key: string]: any;
+  }
+
+  interface MindMapNode {
+    data: { text: string; [key: string]: any };
+    children?: MindMapNode[];
+    nodeData: MindMapData;
+    [key: string]: any;
+  }
+
+  interface MindMapView {
+    enlarge(cx?: number, cy?: number): void;
+    narrow(cx?: number, cy?: number): void;
+    setScale(scale: number, cx?: number, cy?: number): void;
+    fit(): void;
+    reset(): void;
+    translateXY(x: number, y: number): void;
+    getTransformData(): { state: { scale: number; x: number; y: number } };
+    setTransformData(data: { state: { scale: number; x: number; y: number } }): void;
+  }
+
+  class MindMap {
+    constructor(options: MindMapOptions);
+
+    static usePlugin(plugin: any): typeof MindMap;
+    static defineTheme(name: string, config: Record<string, any>): void;
+
+    view: MindMapView;
+
+    setData(data: MindMapData): void;
+    setTheme(theme: string): void;
+    setThemeConfig(config: Record<string, any>): void;
+    setLayout(layout: string): void;
+    execCommand(command: string, ...args: any[]): void;
+    export(
+      type: 'png' | 'jpg' | 'svg' | 'json' | 'pdf' | 'smm' | 'md' | 'txt',
+      isDownload?: boolean,
+      fileName?: string,
+      ...args: any[]
+    ): Promise<any> | any;
+    on(event: string, callback: (...args: any[]) => void): void;
+    off(event: string, callback: (...args: any[]) => void): void;
+    destroy(): void;
+  }
+
+  export default MindMap;
+}
+
+declare module 'simple-mind-map/src/plugins/Export.js' {
+  const Export: any;
+  export default Export;
+}
+
+declare module 'simple-mind-map/src/parse/markdown.js' {
+  export function transformMarkdownTo(markdown: string): any;
+  export function transformToMarkdown(data: any): string;
+}
diff --git a/frontend_zh/src/utils/mermaidToMarkdown.ts b/frontend_zh/src/utils/mermaidToMarkdown.ts
new file mode 100644
index 0000000..e00ade1
--- /dev/null
+++ b/frontend_zh/src/utils/mermaidToMarkdown.ts
@@ -0,0 +1,124 @@
+/**
+ * Convert Mermaid mindmap syntax to Markdown headings format.
+ * Used as fallback for legacy .mmd files.
+ *
+ * Input example:
+ *   mindmap
+ *     root((Central Topic))
+ *       Topic 1
+ *         Sub 1.1
+ *       Topic 2
+ *
+ * Output:
+ *   # Central Topic
+ *   ## Topic 1
+ *   ### Sub 1.1
+ *   ## Topic 2
+ */
+
+function stripShapeDecorators(text: string): string {
+  return text
+    .replace(/^\(\((.+?)\)\)$/, '$1')
+    .replace(/^\((.+?)\)$/, '$1')
+    .replace(/^\[(.+?)\]$/, '$1')
+    .replace(/^\{\{(.+?)\}\}$/, '$1')
+    .replace(/^\)(.+?)\($/, '$1')
+    .replace(/^>(.+?)\]$/, '$1');
+}
+
+export function mermaidToMarkdown(mermaidCode: string): string {
+  const lines = mermaidCode.split('\n');
+  const result: string[] = [];
+  let baseIndent = -1;
+  let indentUnit = 2;
+
+  for (const line of lines) {
+    const trimmed = line.trimEnd();
+    if (!trimmed || trimmed.trim() === 'mindmap') continue;
+
+    const indent = line.length - line.trimStart().length;
+    let text = trimmed.trim();
+
+    // Handle root line
+    if (text.startsWith('root')) {
+      text = text.replace(/^root\s*/, '').trim();
+      text = stripShapeDecorators(text);
+      baseIndent = indent;
+      result.push(`# ${text}`);
+      continue;
+    }
+
+    // Detect indent unit from first non-root indented line
+    if (baseIndent >= 0 && indent > baseIndent && indentUnit === 2) {
+      indentUnit = indent - baseIndent;
+    }
+
+    text = stripShapeDecorators(text);
+
+    const depth = Math.max(1, Math.floor((indent - baseIndent) / indentUnit) + 1);
+    const hashes = '#'.repeat(Math.min(depth, 6));
+    result.push(`${hashes} ${text}`);
+  }
+
+  return result.join('\n');
+}
+
+/**
+ * Detect if the input is Mermaid mindmap syntax (vs already Markdown).
+ */
+export function isMermaidMindmap(code: string): boolean {
+  const trimmed = code.trimStart();
+  return trimmed.startsWith('mindmap');
+}
+
+/**
+ * Convert Markdown headings to Mermaid mindmap syntax.
+ *
+ * Input:
+ *   # Central Topic
+ *   ## Topic 1
+ *   ### Sub 1.1
+ *
+ * Output:
+ *   mindmap
+ *     root((Central Topic))
+ *       Topic 1
+ *         Sub 1.1
+ */
+let _nodeIdCounter = 0;
+
+function needsEscape(text: string): boolean {
+  return /[()[\]{}<>"'/\\,;:!?]/.test(text);
+}
+
+export function markdownToMermaid(markdown: string): string {
+  _nodeIdCounter = 0;
+  const lines = markdown.split('\n');
+  const result: string[] = ['mindmap'];
+
+  for (const line of lines) {
+    const match = line.match(/^(#{1,6})\s+(.+)/);
+    if (!match) continue;
+
+    const depth = match[1].length;
+    const text = match[2].trim();
+    const indent = '  '.repeat(depth);
+
+    if (depth === 1) {
+      // Root node: use round shape
+      if (needsEscape(text)) {
+        result.push(`${indent}root["${text}"]`);
+      } else {
+        result.push(`${indent}root(${text})`);
+      }
+    } else if (needsEscape(text)) {
+      // Nodes with special chars: use id["text"] syntax
+      const id = `n${++_nodeIdCounter}`;
+      result.push(`${indent}${id}["${text}"]`);
+    } else {
+      result.push(`${indent}${text}`);
+    }
+  }
+
+  return result.join('\n');
+}

From 63eab617ddec0462e1dda5f3144e203ed856b73a Mon Sep 17 00:00:00 2001
From: Anion <1005128408@qq.com>
Date: Tue, 31 Mar 2026 15:26:28 +0800
Subject: [PATCH 4/6] feat: replace MermaidPreview with interactive
 MindMapPreview

- New MindMapPreview component using simple-mind-map with:
  expand/collapse all, zoom/pan/fit, node expand/collapse buttons,
  PNG/TXT/Mermaid export, click-to-ask popover with contextual questions
- Wire onNodeClick to close modal, switch to chat, and focus input
- Fix preview modal missing rounded corners and backdrop blur
- Delete old MermaidPreview component
---
 .../src/components/knowledge-base/index.tsx   |   4 +-
 .../knowledge-base/tools/MermaidPreview.tsx   | 305 ------------------
 .../knowledge-base/tools/MindMapPreview.tsx   | 303 +++++++++++++++++
 frontend_en/src/pages/NotebookView.tsx        |  29 +-
 .../src/components/knowledge-base/index.tsx   |   4 +-
 .../knowledge-base/tools/MermaidPreview.tsx   | 305 ------------------
 .../knowledge-base/tools/MindMapPreview.tsx   | 302 +++++++++++++++++
 frontend_zh/src/pages/NotebookView.tsx        |  29 +-
 8 files changed, 649 insertions(+), 632 deletions(-)
 delete mode 100644 frontend_en/src/components/knowledge-base/tools/MermaidPreview.tsx
 create mode 100644 frontend_en/src/components/knowledge-base/tools/MindMapPreview.tsx
 delete mode 100644 frontend_zh/src/components/knowledge-base/tools/MermaidPreview.tsx
 create mode 100644 frontend_zh/src/components/knowledge-base/tools/MindMapPreview.tsx

diff --git a/frontend_en/src/components/knowledge-base/index.tsx b/frontend_en/src/components/knowledge-base/index.tsx
index d88bef2..de9f21c 100644
--- a/frontend_en/src/components/knowledge-base/index.tsx
+++ b/frontend_en/src/components/knowledge-base/index.tsx
@@ -6,7 +6,7 @@ import { UploadView } from './UploadView';
 import { OutputView } from './OutputView';
 import { SettingsView } from './SettingsView';
 import { RightPanel } from './RightPanel';
-import { MermaidPreview } from './tools/MermaidPreview';
+import { MindMapPreview } from './tools/MindMapPreview';
 import { supabase } from '../../lib/supabase';
 import { useAuthStore } from '../../stores/authStore';
 import { X, Eye, Trash2, FileText, Image, Video, Link as LinkIcon, Headphones } from 'lucide-react';
@@ -493,7 +493,7 @@ const KnowledgeBase = () => {
                             />
 
                             {mindmapPreviewCode ? (
-                              <MermaidPreview mermaidCode={mindmapPreviewCode} title="Mind map preview" />
+                              <MindMapPreview mermaidCode={mindmapPreviewCode} title="Mind map preview" />
                             ) : (
                               <div className="text-xs text-gray-500">No preview</div>
                             )}
diff --git a/frontend_en/src/components/knowledge-base/tools/MermaidPreview.tsx b/frontend_en/src/components/knowledge-base/tools/MermaidPreview.tsx
deleted file mode 100644
index 66b6b63..0000000
--- a/frontend_en/src/components/knowledge-base/tools/MermaidPreview.tsx
+++ /dev/null
@@ -1,305 +0,0 @@
-import { useEffect, useRef, useState } from 'react';
-import { createPortal } from 'react-dom';
-import mermaid from 'mermaid';
-import { Download, Eye, Code, Maximize2, X } from 'lucide-react';
-
-interface MermaidPreviewProps {
-  mermaidCode: string;
-  title?: string;
-}
-
-export const MermaidPreview = ({ mermaidCode, title = "Mind map preview" }: MermaidPreviewProps) => {
-  const mermaidRef = useRef<HTMLDivElement>(null);
-  const [showCode, setShowCode] = useState(false);
-  const [renderError, setRenderError] = useState<string | null>(null);
-  const [renderedSvg, setRenderedSvg] = useState('');
-  const [showModal, setShowModal] = useState(false);
-  const [modalSvg, setModalSvg] = useState('');
-  const [zoom, setZoom] = useState(1);
-  const [offset, setOffset] = useState({ x: 0, y: 0 });
-  const [isDragging, setIsDragging] = useState(false);
-  const [dragStart, setDragStart] = useState({ x: 0, y: 0 });
-  const [dragOrigin, setDragOrigin] = useState({ x: 0, y: 0 });
-
-  useEffect(() => {
-    mermaid.initialize({
-      startOnLoad: false,
-      theme: 'dark',
-      themeVariables: {
-        primaryColor: '#0ea5e9',
-        primaryTextColor: '#fff',
-        primaryBorderColor: '#0284c7',
-        lineColor: '#06b6d4',
-        secondaryColor: '#0891b2',
-        tertiaryColor: '#164e63',
-      },
-      fontFamily: 'ui-sans-serif, system-ui, sans-serif',
-    });
-  }, []);
-
-  useEffect(() => {
-    const renderMermaid = async () => {
-      if (!mermaidCode || !mermaidRef.current) return;
-
-      try {
-        setRenderError(null);
-        setRenderedSvg('');
-        mermaidRef.current.innerHTML = '';
-
-        const id = `mermaid-${Date.now()}`;
-        const { svg } = await mermaid.render(id, mermaidCode);
-        setRenderedSvg(svg);
-
-        if (mermaidRef.current) {
-          mermaidRef.current.innerHTML = svg;
-        }
-      } catch (error: any) {
-        console.error('Mermaid render error:', error);
-        setRenderError(error.message || 'Failed to render diagram');
-        setRenderedSvg('');
-      }
-    };
-
-    renderMermaid();
-  }, [mermaidCode]);
-
-  const renderSvgForExport = async () => {
-    if (renderedSvg) return renderedSvg;
-    const id = `mermaid-export-${Date.now()}`;
-    const { svg } = await mermaid.render(id, mermaidCode);
-    return svg;
-  };
-
-  const normalizeSvg = (svg: string) => {
-    return svg.replace(/<svg([^>]*?)>/i, (match, attrs) => {
-      let next = attrs
-        .replace(/\swidth="[^"]*"/i, '')
-        .replace(/\sheight="[^"]*"/i, '');
-
-      if (!/preserveAspectRatio=/i.test(next)) {
-        next += ' preserveAspectRatio="xMidYMid meet"';
-      }
-
-      if (/style="/i.test(next)) {
-        next = next.replace(/style="([^"]*)"/i, (_, style) => {
-          const merged = `${style}; width:100%; height:100%;`;
-          return `style="${merged}"`;
-        });
-      } else {
-        next += ' style="width:100%; height:100%;"';
-      }
-
-      return `<svg${next}>`;
-    });
-  };
-
-  const handleDownloadSVG = async () => {
-    if (!mermaidCode) return;
-    try {
-      const svgData = await renderSvgForExport();
-      const blob = new Blob([svgData], { type: 'image/svg+xml' });
-      const url = URL.createObjectURL(blob);
-      const link = document.createElement('a');
-      link.href = url;
-      link.download = `mindmap_${Date.now()}.svg`;
-      document.body.appendChild(link);
-      link.click();
-      document.body.removeChild(link);
-      URL.revokeObjectURL(url);
-    } catch (error) {
-      console.error('Download SVG failed:', error);
-    }
-  };
-
-  const handleDownloadCode = () => {
-    const blob = new Blob([mermaidCode], { type: 'text/plain' });
-    const url = URL.createObjectURL(blob);
-
-    const link = document.createElement('a');
-    link.href = url;
-    link.download = `mindmap_${Date.now()}.mmd`;
-    document.body.appendChild(link);
-    link.click();
-    document.body.removeChild(link);
-    URL.revokeObjectURL(url);
-  };
-
-  const handleExpand = async () => {
-    if (!mermaidCode) return;
-    try {
-      const svgData = await renderSvgForExport();
-      setModalSvg(normalizeSvg(svgData));
-      setZoom(1);
-      setOffset({ x: 0, y: 0 });
-      setShowModal(true);
-    } catch (error) {
-      console.error('Expand preview failed:', error);
-    }
-  };
-
-  const clampZoom = (value: number) => Math.min(5, Math.max(0.2, value));
-
-  const handleWheel = (e: React.WheelEvent<HTMLDivElement>) => {
-    e.preventDefault();
-    const direction = e.deltaY > 0 ? 0.9 : 1.1;
-    setZoom(prev => clampZoom(prev * direction));
-  };
-
-  const handleMouseDown = (e: React.MouseEvent<HTMLDivElement>) => {
-    setIsDragging(true);
-    setDragStart({ x: e.clientX, y: e.clientY });
-    setDragOrigin(offset);
-  };
-
-  const handleMouseMove = (e: React.MouseEvent<HTMLDivElement>) => {
-    if (!isDragging) return;
-    const dx = e.clientX - dragStart.x;
-    const dy = e.clientY - dragStart.y;
-    setOffset({ x: dragOrigin.x + dx, y: dragOrigin.y + dy });
-  };
-
-  const handleMouseUp = () => {
-    setIsDragging(false);
-  };
-
-  return (
-    <div className="border-t border-white/10 pt-6">
-      <div className="flex items-center justify-between mb-4">
-        <h4 className="text-sm font-medium text-gray-300">{title}</h4>
-        <div className="flex items-center gap-2">
-          <button
-            onClick={handleExpand}
-            className="px-3 py-1.5 bg-white/5 hover:bg-white/10 border border-white/10 rounded-lg text-xs text-gray-300 flex items-center gap-1.5 transition-colors"
-          >
-            <Maximize2 size={14} />
-            Zoom
-          </button>
-          <button
-            onClick={() => setShowCode(!showCode)}
-            className="px-3 py-1.5 bg-white/5 hover:bg-white/10 border border-white/10 rounded-lg text-xs text-gray-300 flex items-center gap-1.5 transition-colors"
-          >
-            {showCode ? <Eye size={14} /> : <Code size={14} />}
-            {showCode ? 'View diagram' : 'View code'}
-          </button>
-          <button
-            onClick={handleDownloadSVG}
-            className="px-3 py-1.5 bg-cyan-500/20 hover:bg-cyan-500/30 border border-cyan-500/30 rounded-lg text-xs text-cyan-300 flex items-center gap-1.5 transition-colors"
-          >
-            <Download size={14} />
-            Download SVG
-          </button>
-          <button
-            onClick={handleDownloadCode}
-            className="px-3 py-1.5 bg-cyan-500/20 hover:bg-cyan-500/30 border border-cyan-500/30 rounded-lg text-xs text-cyan-300 flex items-center gap-1.5 transition-colors"
-          >
-            <Download size={14} />
-            Download code
-          </button>
-        </div>
-      </div>
-
-      {showCode ? (
-        <div className="bg-white/5 border border-white/10 rounded-lg p-4">
-          <div className="text-xs text-gray-400 mb-2">Mermaid code:</div>
-          <pre className="text-xs text-gray-300 bg-black/40 p-3 rounded overflow-x-auto max-h-96">
-            {mermaidCode}
-          </pre>
-        </div>
-      ) : (
-        <div className="bg-white/5 border border-white/10 rounded-lg p-6">
-          {renderError ? (
-            <div className="text-center py-8">
-              <div className="text-red-400 text-sm mb-2">Render failed</div>
-              <div className="text-xs text-gray-500">{renderError}</div>
-              <button
-                onClick={() => setShowCode(true)}
-                className="mt-4 text-xs text-cyan-400 hover:text-cyan-300"
-              >
-                View raw code
-              </button>
-            </div>
-          ) : (
-            <div
-              ref={mermaidRef}
-              className="flex items-center justify-center overflow-x-auto"
-              style={{ minHeight: '200px' }}
-            />
-          )}
-        </div>
-      )}
-
-      <div className="mt-3 text-xs text-gray-500">
-        Tip: Toggle diagram/code view or download SVG / Mermaid code
-      </div>
-
-      {showModal && createPortal(
-        <div
-          className="fixed inset-0 z-[200] bg-black/60 backdrop-blur-md flex items-center justify-center p-6"
-          onClick={() => setShowModal(false)}
-        >
-          <div
-            className="w-[92vw] h-[90vh] max-w-none bg-[#0b0b1a] border border-white/10 rounded-2xl shadow-2xl overflow-hidden flex flex-col"
-            onClick={e => e.stopPropagation()}
-          >
-            <div className="flex items-center justify-between px-4 py-3 border-b border-white/10">
-              <div className="text-sm text-gray-300">Mind map zoom preview</div>
-              <div className="flex items-center gap-2">
-                <button
-                  onClick={() => setZoom(prev => clampZoom(prev * 0.9))}
-                  className="px-2 py-1 text-xs rounded-lg bg-white/5 hover:bg-white/10 text-gray-300"
-                >
-                  Zoom out
-                </button>
-                <button
-                  onClick={() => setZoom(prev => clampZoom(prev * 1.1))}
-                  className="px-2 py-1 text-xs rounded-lg bg-white/5 hover:bg-white/10 text-gray-300"
-                >
-                  Zoom in
-                </button>
-                <button
-                  onClick={() => {
-                    setZoom(1);
-                    setOffset({ x: 0, y: 0 });
-                  }}
-                  className="px-2 py-1 text-xs rounded-lg bg-white/5 hover:bg-white/10 text-gray-300"
-                >
-                  Reset
-                </button>
-                <button
-                  onClick={() => setShowModal(false)}
-                  className="p-2 rounded-lg text-gray-400 hover:text-white hover:bg-white/10 transition-colors"
-                >
-                  <X size={18} />
-                </button>
-              </div>
-            </div>
-            <div
-              className="flex-1 overflow-hidden p-6"
-              onWheel={handleWheel}
-              onMouseDown={handleMouseDown}
-              onMouseMove={handleMouseMove}
-              onMouseUp={handleMouseUp}
-              onMouseLeave={handleMouseUp}
-              style={{ cursor: isDragging ? 'grabbing' : 'grab' }}
-            >
-              {modalSvg ? (
-                <div className="w-full h-full flex items-center justify-center">
-                  <div
-                    style={{
-                      transform: `translate(${offset.x}px, ${offset.y}px) scale(${zoom})`,
-                      transformOrigin: 'center center'
-                    }}
-                    dangerouslySetInnerHTML={{ __html: modalSvg }}
-                  />
-                </div>
-              ) : (
-                <div className="text-sm text-gray-500">No preview</div>
-              )}
-            </div>
-          </div>
-        </div>,
-        document.body
-      )}
-    </div>
-  );
-};
diff --git a/frontend_en/src/components/knowledge-base/tools/MindMapPreview.tsx b/frontend_en/src/components/knowledge-base/tools/MindMapPreview.tsx
new file mode 100644
index 0000000..23e6125
--- /dev/null
+++ b/frontend_en/src/components/knowledge-base/tools/MindMapPreview.tsx
@@ -0,0 +1,303 @@
+import { useEffect, useRef, useState, useCallback } from 'react';
+import MindMap from 'simple-mind-map';
+import Export from 'simple-mind-map/src/plugins/Export.js';
+import { transformMarkdownTo } from 'simple-mind-map/src/parse/markdownTo.js';
+import { Download, Expand, Shrink, ZoomIn, ZoomOut, Maximize2, MessageSquare, FileText, Code } from 'lucide-react';
+import { mermaidToMarkdown, isMermaidMindmap, markdownToMermaid } from '../../../utils/mermaidToMarkdown';
+
+MindMap.usePlugin(Export);
+
+interface MindMapPreviewProps {
+  mermaidCode: string;
+  title?: string;
+  onNodeClick?: (nodeText: string) => void;
+}
+
+export const MindMapPreview = ({ mermaidCode, title = "Mind map preview", onNodeClick }: MindMapPreviewProps) => {
+  const containerRef = useRef<HTMLDivElement>(null);
+  const mindMapRef = useRef<MindMap | null>(null);
+  const [renderError, setRenderError] = useState<string | null>(null);
+  const [isReady, setIsReady] = useState(false);
+  const [tooltip, setTooltip] = useState<{ text: string; x: number; y: number } | null>(null);
+  const [askMenu, setAskMenu] = useState<{ nodeText: string; parentText: string; x: number; y: number } | null>(null);
+
+  // Convert input to markdown if needed, then to mind map data
+  const parseData = useCallback(() => {
+    if (!mermaidCode) return null;
+    try {
+      const markdown = isMermaidMindmap(mermaidCode)
+        ? mermaidToMarkdown(mermaidCode)
+        : mermaidCode;
+      return transformMarkdownTo(markdown);
+    } catch {
+      return null;
+    }
+  }, [mermaidCode]);
+
+  useEffect(() => {
+    if (!containerRef.current || !mermaidCode) return;
+
+    const data = parseData();
+    if (!data) {
+      setRenderError('Failed to parse mindmap data');
+      return;
+    }
+
+    setRenderError(null);
+
+    // Destroy previous instance
+    if (mindMapRef.current) {
+      mindMapRef.current.destroy();
+      mindMapRef.current = null;
+      setIsReady(false);
+    }
+
+    try {
+      const mm = new MindMap({
+        el: containerRef.current,
+        data,
+        theme: 'default',
+        layout: 'logicalStructure',
+        scaleRatio: 0.1,
+        minZoomRatio: 20,
+        maxZoomRatio: 500,
+        readonly: true,
+        enableFreeDrag: false,
+        alwaysShowExpandBtn: true,
+        initRootNodePosition: ['center', 'center'],
+        exportPaddingX: 20,
+        exportPaddingY: 20,
+      });
+
+      mindMapRef.current = mm;
+
+      if (onNodeClick) {
+        mm.on('node_click', (node: any, e: any) => {
+          const text = node?.nodeData?.data?.text;
+          if (!text) return;
+          setTooltip(null);
+          const parentText = node?.parent?.nodeData?.data?.text || '';
+          const raw = e?.originEvent || e?.event || e;
+          const rect = containerRef.current?.getBoundingClientRect();
+          if (rect && raw?.clientX != null) {
+            setAskMenu({
+              nodeText: text,
+              parentText,
+              x: raw.clientX - rect.left,
+              y: raw.clientY - rect.top,
+            });
+          } else if (rect) {
+            setAskMenu({
+              nodeText: text,
+              parentText,
+              x: rect.width / 2,
+              y: rect.height / 2,
+            });
+          }
+        });
+        mm.on('node_mouseenter', (node: any, e: any) => {
+          const text = node?.nodeData?.data?.text;
+          if (text) {
+            const raw = e?.originEvent || e?.event || e;
+            const rect = containerRef.current?.getBoundingClientRect();
+            if (rect && raw?.clientX != null) {
+              setTooltip({
+                text: 'Click to ask',
+                x: raw.clientX - rect.left,
+                y: raw.clientY - rect.top - 36,
+              });
+            }
+          }
+        });
+        mm.on('node_mouseleave', () => {
+          setTooltip(null);
+        });
+      }
+
+      // Fit view after render
+      // Only fit on initial render, not on expand/collapse
+      let firstRender = true;
+      mm.on('node_tree_render_end', () => {
+        if (firstRender) {
+          firstRender = false;
+          setIsReady(true);
+          setTimeout(() => mm.view.fit(), 100);
+        }
+      });
+    } catch (e: any) {
+      console.error('MindMap render error:', e);
+      setRenderError(e.message || 'Failed to render mindmap');
+    }
+
+    return () => {
+      if (mindMapRef.current) {
+        mindMapRef.current.destroy();
+        mindMapRef.current = null;
+      }
+    };
+  }, [mermaidCode]);
+
+  const handleExpandAll = () => {
+    mindMapRef.current?.execCommand('EXPAND_ALL');
+  };
+
+  const handleCollapseAll = () => {
+    mindMapRef.current?.execCommand('UNEXPAND_ALL');
+  };
+
+  const handleZoomIn = () => mindMapRef.current?.view.enlarge();
+  const handleZoomOut = () => mindMapRef.current?.view.narrow();
+  const handleFit = () => mindMapRef.current?.view.fit();
+
+  const handleDownloadPng = async () => {
+    if (!mindMapRef.current) return;
+    try {
+      // Save current view state
+      const viewState = mindMapRef.current.view.getTransformData();
+      const fullData = mindMapRef.current.getData();
+      // Expand all for export
+      mindMapRef.current.execCommand('EXPAND_ALL');
+      await new Promise(r => setTimeout(r, 500));
+      await mindMapRef.current.export('png', true, `mindmap_${Date.now()}`);
+      // Restore previous state
+      mindMapRef.current.setData(fullData);
+      await new Promise(r => setTimeout(r, 300));
+      mindMapRef.current.view.setTransformData(viewState);
+    } catch (e) {
+      console.error('PNG export failed:', e);
+    }
+  };
+
+  const handleDownloadTxt = async () => {
+    if (!mindMapRef.current) return;
+    try {
+      await mindMapRef.current.export('txt', true, `mindmap_${Date.now()}`);
+    } catch (e) {
+      console.error('TXT export failed:', e);
+    }
+  };
+
+  const handleDownloadMermaid = () => {
+    const mermaid = isMermaidMindmap(mermaidCode)
+      ? mermaidCode
+      : markdownToMermaid(mermaidCode);
+    const blob = new Blob([mermaid], { type: 'text/plain' });
+    const url = URL.createObjectURL(blob);
+    const link = document.createElement('a');
+    link.href = url;
+    link.download = `mindmap_${Date.now()}.mmd`;
+    document.body.appendChild(link);
+    link.click();
+    document.body.removeChild(link);
+    URL.revokeObjectURL(url);
+  };
+
+  const btnBase = "px-2.5 py-1.5 rounded-lg text-xs flex items-center gap-1.5 transition-colors";
+  const btnGhost = `${btnBase} bg-gray-100 hover:bg-gray-200 border border-gray-200 text-gray-600`;
+  const btnAccent = `${btnBase} bg-cyan-50 hover:bg-cyan-100 border border-cyan-200 text-cyan-700`;
+
+  return (
+    <div className="pt-4">
+      <div className="flex items-center justify-between mb-3">
+        <h4 className="text-sm font-semibold text-gray-700">{title}</h4>
+      </div>
+
+      {/* Toolbar */}
+      <div className="flex flex-wrap items-center gap-2 mb-4">
+        {/* View controls */}
+        <button onClick={handleExpandAll} className={btnGhost} title="Expand all">
+          <Expand size={14} /> Expand all
+        </button>
+        <button onClick={handleCollapseAll} className={btnGhost} title="Collapse all">
+          <Shrink size={14} /> Collapse all
+        </button>
+        <button onClick={handleZoomIn} className={btnGhost} title="Zoom in">
+          <ZoomIn size={14} />
+        </button>
+        <button onClick={handleZoomOut} className={btnGhost} title="Zoom out">
+          <ZoomOut size={14} />
+        </button>
+        <button onClick={handleFit} className={btnGhost} title="Fit view">
+          <Maximize2 size={14} /> Fit
+        </button>
+
+        <div className="w-px h-5 bg-gray-200 mx-1" />
+
+        {/* Export controls */}
+        <button onClick={handleDownloadPng} className={btnAccent} title="Download PNG (fully expanded)">
+          <Download size={14} /> PNG
+        </button>
+        <button onClick={handleDownloadTxt} className={btnAccent} title="Download hierarchical text">
+          <FileText size={14} /> TXT
+        </button>
+        <button onClick={handleDownloadMermaid} className={btnAccent} title="Download Mermaid code">
+          <Code size={14} /> Mermaid
+        </button>
+      </div>
+
+      {/* Mind map container */}
+      {renderError ? (
+        <div className="bg-red-50 border border-red-200 rounded-xl p-6 text-center">
+          <div className="text-red-600 text-sm mb-2">Render failed</div>
+          <div className="text-xs text-red-400">{renderError}</div>
+        </div>
+      ) : (
+        <div className="relative">
+          <div
+            ref={containerRef}
+            className="bg-white border border-gray-200 rounded-xl overflow-hidden shadow-sm"
+            style={{ width: '100%', height: '500px', cursor: onNodeClick ? 'pointer' : 'default' }}
+          />
+          {tooltip && !askMenu && (
+            <div
+              className="absolute pointer-events-none z-50 px-2.5 py-1.5 bg-gray-800 text-white text-xs rounded-lg shadow-lg whitespace-nowrap"
+              style={{ left: tooltip.x, top: tooltip.y, transform: 'translateX(-50%)' }}
+            >
+              {tooltip.text}
+            </div>
+          )}
+        </div>
+      )}
+
+      {askMenu && onNodeClick && (
+        <>
+          <div className="fixed inset-0 z-[100]" onClick={() => setAskMenu(null)} />
+          <div
+            className="fixed z-[101] w-80 bg-white border border-gray-200 rounded-xl shadow-xl p-2 space-y-1"
+            style={{ left: askMenu.x + (containerRef.current?.getBoundingClientRect()?.left || 0), top: askMenu.y + (containerRef.current?.getBoundingClientRect()?.top || 0) + 8 }}
+          >
+            <div className="px-3 py-1.5 text-xs text-gray-400 font-medium">Ask about "{askMenu.nodeText}"</div>
+            <button
+              className="w-full text-left px-3 py-2 text-sm text-gray-700 hover:bg-cyan-50 hover:text-cyan-700 rounded-lg transition-colors"
+              onClick={() => {
+                onNodeClick(`Discuss what these sources say about "${askMenu.nodeText}".`);
+                setAskMenu(null);
+              }}
+            >
+              <MessageSquare size={14} className="inline mr-2 text-cyan-500" />
+              Discuss what sources say about "{askMenu.nodeText}"
+            </button>
+            {askMenu.parentText && (
+              <button
+                className="w-full text-left px-3 py-2 text-sm text-gray-700 hover:bg-cyan-50 hover:text-cyan-700 rounded-lg transition-colors"
+                onClick={() => {
+                  onNodeClick(`In the broader context of "${askMenu.parentText}", discuss what these sources say about "${askMenu.nodeText}".`);
+                  setAskMenu(null);
+                }}
+              >
+                <MessageSquare size={14} className="inline mr-2 text-cyan-500" />
+                In context of "{askMenu.parentText}", discuss "{askMenu.nodeText}"
+              </button>
+            )}
+          </div>
+        </>
+      )}
+
+      <div className="mt-3 text-xs text-gray-400">
+        {onNodeClick
+          ? 'Tip: Scroll to zoom, drag to pan. Click a node to ask a question about it.'
+          : 'Tip: Scroll to zoom, drag to pan. Click the button next to a node to expand/collapse.'}
+      </div>
+    </div>
+  );
+};
diff --git a/frontend_en/src/pages/NotebookView.tsx b/frontend_en/src/pages/NotebookView.tsx
index 1961f3e..f35ea5f 100644
--- a/frontend_en/src/pages/NotebookView.tsx
+++ b/frontend_en/src/pages/NotebookView.tsx
@@ -1,4 +1,4 @@
-import React, { useState, useEffect } from 'react';
+import React, { useState, useEffect, useCallback } from 'react';
 import { motion, AnimatePresence } from 'framer-motion';
 import {
   ChevronLeft, Plus, Share2, Settings, MessageSquare,
@@ -13,7 +13,7 @@ import { getApiSettings } from '../services/apiSettingsService';
 import { fetchWithCache, invalidateCacheByPrefix } from '../services/clientCache';
 import type { KnowledgeFile, ChatMessage, ToolType } from '../types';
 import ReactMarkdown from 'react-markdown';
-import { MermaidPreview } from '../components/knowledge-base/tools/MermaidPreview';
+import { MindMapPreview } from '../components/knowledge-base/tools/MindMapPreview';
 import { SettingsModal } from '../components/SettingsModal';
 import DrawioInlineEditor from '../components/DrawioInlineEditor';
 import { FlashcardViewer } from '../components/flashcards/FlashcardViewer';
@@ -79,6 +79,16 @@ const NotebookView = ({ notebook, onBack }: { notebook: any, onBack: () => void
   const chatPersistSkippedRef = React.useRef(false);
   const conversationIdRef = React.useRef<string | null>(null);
   const [inputMsg, setInputMsg] = useState('');
+  const handleMindmapNodeClick = useCallback((question: string) => {
+    setInputMsg(question);
+    setActiveTool('chat');
+    setChatSubView('current');
+    setPreviewOutput(null);
+    setTimeout(() => {
+      const input = document.querySelector<HTMLInputElement>('input[type="text"]');
+      input?.focus();
+    }, 100);
+  }, []);
   const [isChatLoading, setIsChatLoading] = useState(false);
   const [chatLoadingStage, setChatLoadingStage] = useState('思考中...');
 
@@ -3239,7 +3249,7 @@ const NotebookView = ({ notebook, onBack }: { notebook: any, onBack: () => void
 
             {toolOutput && activeTool === 'mindmap' && toolOutput.mindmap_code && (
               <div className="bg-white border border-gray-200 rounded-xl p-4">
-                <MermaidPreview mermaidCode={toolOutput.mindmap_code} title="思维导图" />
+                <MindMapPreview mermaidCode={toolOutput.mindmap_code} title="思维导图" onNodeClick={handleMindmapNodeClick} />
               </div>
             )}
 
@@ -3755,14 +3765,14 @@ const NotebookView = ({ notebook, onBack }: { notebook: any, onBack: () => void
             initial={{ opacity: 0 }}
             animate={{ opacity: 1 }}
             exit={{ opacity: 0 }}
-            className="absolute inset-0 glass-dark"
+            className="absolute inset-0 bg-black/40 backdrop-blur-sm"
           />
           <motion.div
             initial={{ y: 100, opacity: 0 }}
             animate={{ y: 0, opacity: 1 }}
             exit={{ y: 100, opacity: 0 }}
             transition={{ type: 'spring', stiffness: 300, damping: 30 }}
-            className={`relative bg-white rounded-t-ios-2xl sm:rounded-ios-2xl shadow-ios-xl border border-ios-gray-100 overflow-hidden flex flex-col ${
+            className={`relative bg-white rounded-t-2xl sm:rounded-2xl shadow-xl border border-gray-200 overflow-hidden flex flex-col ${
               previewOutput.type === 'drawio'
                 ? 'w-[95vw] h-[95vh] min-w-[320px] min-h-[360px]'
                 : 'w-[90vw] h-[90vh] max-w-[1600px] max-h-[90vh] min-w-[320px] min-h-[360px]'
@@ -3770,7 +3780,7 @@ const NotebookView = ({ notebook, onBack }: { notebook: any, onBack: () => void
             onClick={(e) => e.stopPropagation()}
           >
             {/* Header */}
-            <div className="flex items-center justify-between px-4 py-3 border-b border-ios-gray-100 bg-white shrink-0">
+            <div className="flex items-center justify-between px-4 py-3 border-b border-gray-200 bg-white shrink-0">
               <div>
                 <h2 className="text-lg font-semibold text-ios-gray-800">{previewOutput.title}</h2>
                 <p className="text-xs text-ios-gray-500 mt-1">来源：{previewOutput.sources}</p>
@@ -3873,9 +3883,10 @@ const NotebookView = ({ notebook, onBack }: { notebook: any, onBack: () => void
               {previewOutput.type === 'mindmap' && previewOutput.mermaidCode && (
                 <div className="h-full flex items-center justify-center">
                   <div className="w-full h-full bg-white rounded-xl shadow-lg p-6">
-                    <MermaidPreview 
-                      mermaidCode={previewOutput.mermaidCode} 
-                      title="思维导图预览" 
+                    <MindMapPreview
+                      mermaidCode={previewOutput.mermaidCode}
+                      title="思维导图预览"
+                      onNodeClick={handleMindmapNodeClick}
                     />
                   </div>
                 </div>
diff --git a/frontend_zh/src/components/knowledge-base/index.tsx b/frontend_zh/src/components/knowledge-base/index.tsx
index 3d41c28..c739a16 100644
--- a/frontend_zh/src/components/knowledge-base/index.tsx
+++ b/frontend_zh/src/components/knowledge-base/index.tsx
@@ -6,7 +6,7 @@ import { UploadView } from './UploadView';
 import { OutputView } from './OutputView';
 import { SettingsView } from './SettingsView';
 import { RightPanel } from './RightPanel';
-import { MermaidPreview } from './tools/MermaidPreview';
+import { MindMapPreview } from './tools/MindMapPreview';
 import { supabase } from '../../lib/supabase';
 import { useAuthStore } from '../../stores/authStore';
 import { useToast } from '../../hooks/useToast';
@@ -496,7 +496,7 @@ const KnowledgeBase = () => {
                             />
 
                             {mindmapPreviewCode ? (
-                              <MermaidPreview mermaidCode={mindmapPreviewCode} title="思维导图预览" />
+                              <MindMapPreview mermaidCode={mindmapPreviewCode} title="思维导图预览" />
                             ) : (
                               <div className="text-xs text-gray-500">暂无可预览内容</div>
                             )}
diff --git a/frontend_zh/src/components/knowledge-base/tools/MermaidPreview.tsx b/frontend_zh/src/components/knowledge-base/tools/MermaidPreview.tsx
deleted file mode 100644
index c853ded..0000000
--- a/frontend_zh/src/components/knowledge-base/tools/MermaidPreview.tsx
+++ /dev/null
@@ -1,305 +0,0 @@
-import { useEffect, useRef, useState } from 'react';
-import { createPortal } from 'react-dom';
-import mermaid from 'mermaid';
-import { Download, Eye, Code, Maximize2, X } from 'lucide-react';
-
-interface MermaidPreviewProps {
-  mermaidCode: string;
-  title?: string;
-}
-
-export const MermaidPreview = ({ mermaidCode, title = "思维导图预览" }: MermaidPreviewProps) => {
-  const mermaidRef = useRef<HTMLDivElement>(null);
-  const [showCode, setShowCode] = useState(false);
-  const [renderError, setRenderError] = useState<string | null>(null);
-  const [renderedSvg, setRenderedSvg] = useState('');
-  const [showModal, setShowModal] = useState(false);
-  const [modalSvg, setModalSvg] = useState('');
-  const [zoom, setZoom] = useState(1);
-  const [offset, setOffset] = useState({ x: 0, y: 0 });
-  const [isDragging, setIsDragging] = useState(false);
-  const [dragStart, setDragStart] = useState({ x: 0, y: 0 });
-  const [dragOrigin, setDragOrigin] = useState({ x: 0, y: 0 });
-
-  useEffect(() => {
-    mermaid.initialize({
-      startOnLoad: false,
-      theme: 'dark',
-      themeVariables: {
-        primaryColor: '#0ea5e9',
-        primaryTextColor: '#fff',
-        primaryBorderColor: '#0284c7',
-        lineColor: '#06b6d4',
-        secondaryColor: '#0891b2',
-        tertiaryColor: '#164e63',
-      },
-      fontFamily: 'ui-sans-serif, system-ui, sans-serif',
-    });
-  }, []);
-
-  useEffect(() => {
-    const renderMermaid = async () => {
-      if (!mermaidCode || !mermaidRef.current) return;
-
-      try {
-        setRenderError(null);
-        setRenderedSvg('');
-        mermaidRef.current.innerHTML = '';
-
-        const id = `mermaid-${Date.now()}`;
-        const { svg } = await mermaid.render(id, mermaidCode);
-        setRenderedSvg(svg);
-
-        if (mermaidRef.current) {
-          mermaidRef.current.innerHTML = svg;
-        }
-      } catch (error: any) {
-        console.error('Mermaid render error:', error);
-        setRenderError(error.message || 'Failed to render diagram');
-        setRenderedSvg('');
-      }
-    };
-
-    renderMermaid();
-  }, [mermaidCode]);
-
-  const renderSvgForExport = async () => {
-    if (renderedSvg) return renderedSvg;
-    const id = `mermaid-export-${Date.now()}`;
-    const { svg } = await mermaid.render(id, mermaidCode);
-    return svg;
-  };
-
-  const normalizeSvg = (svg: string) => {
-    return svg.replace(/<svg([^>]*?)>/i, (match, attrs) => {
-      let next = attrs
-        .replace(/\swidth="[^"]*"/i, '')
-        .replace(/\sheight="[^"]*"/i, '');
-
-      if (!/preserveAspectRatio=/i.test(next)) {
-        next += ' preserveAspectRatio="xMidYMid meet"';
-      }
-
-      if (/style="/i.test(next)) {
-        next = next.replace(/style="([^"]*)"/i, (_, style) => {
-          const merged = `${style}; width:100%; height:100%;`;
-          return `style="${merged}"`;
-        });
-      } else {
-        next += ' style="width:100%; height:100%;"';
-      }
-
-      return `<svg${next}>`;
-    });
-  };
-
-  const handleDownloadSVG = async () => {
-    if (!mermaidCode) return;
-    try {
-      const svgData = await renderSvgForExport();
-      const blob = new Blob([svgData], { type: 'image/svg+xml' });
-      const url = URL.createObjectURL(blob);
-      const link = document.createElement('a');
-      link.href = url;
-      link.download = `mindmap_${Date.now()}.svg`;
-      document.body.appendChild(link);
-      link.click();
-      document.body.removeChild(link);
-      URL.revokeObjectURL(url);
-    } catch (error) {
-      console.error('Download SVG failed:', error);
-    }
-  };
-
-  const handleDownloadCode = () => {
-    const blob = new Blob([mermaidCode], { type: 'text/plain' });
-    const url = URL.createObjectURL(blob);
-
-    const link = document.createElement('a');
-    link.href = url;
-    link.download = `mindmap_${Date.now()}.mmd`;
-    document.body.appendChild(link);
-    link.click();
-    document.body.removeChild(link);
-    URL.revokeObjectURL(url);
-  };
-
-  const handleExpand = async () => {
-    if (!mermaidCode) return;
-    try {
-      const svgData = await renderSvgForExport();
-      setModalSvg(normalizeSvg(svgData));
-      setZoom(1);
-      setOffset({ x: 0, y: 0 });
-      setShowModal(true);
-    } catch (error) {
-      console.error('Expand preview failed:', error);
-    }
-  };
-
-  const clampZoom = (value: number) => Math.min(5, Math.max(0.2, value));
-
-  const handleWheel = (e: React.WheelEvent<HTMLDivElement>) => {
-    e.preventDefault();
-    const direction = e.deltaY > 0 ? 0.9 : 1.1;
-    setZoom(prev => clampZoom(prev * direction));
-  };
-
-  const handleMouseDown = (e: React.MouseEvent<HTMLDivElement>) => {
-    setIsDragging(true);
-    setDragStart({ x: e.clientX, y: e.clientY });
-    setDragOrigin(offset);
-  };
-
-  const handleMouseMove = (e: React.MouseEvent<HTMLDivElement>) => {
-    if (!isDragging) return;
-    const dx = e.clientX - dragStart.x;
-    const dy = e.clientY - dragStart.y;
-    setOffset({ x: dragOrigin.x + dx, y: dragOrigin.y + dy });
-  };
-
-  const handleMouseUp = () => {
-    setIsDragging(false);
-  };
-
-  return (
-    <div className="border-t border-white/10 pt-6">
-      <div className="flex items-center justify-between mb-4">
-        <h4 className="text-sm font-medium text-gray-300">{title}</h4>
-        <div className="flex items-center gap-2">
-          <button
-            onClick={handleExpand}
-            className="px-3 py-1.5 bg-white/5 hover:bg-white/10 border border-white/10 rounded-lg text-xs text-gray-300 flex items-center gap-1.5 transition-colors"
-          >
-            <Maximize2 size={14} />
-            放大
-          </button>
-          <button
-            onClick={() => setShowCode(!showCode)}
-            className="px-3 py-1.5 bg-white/5 hover:bg-white/10 border border-white/10 rounded-lg text-xs text-gray-300 flex items-center gap-1.5 transition-colors"
-          >
-            {showCode ? <Eye size={14} /> : <Code size={14} />}
-            {showCode ? '查看图形' : '查看代码'}
-          </button>
-          <button
-            onClick={handleDownloadSVG}
-            className="px-3 py-1.5 bg-cyan-500/20 hover:bg-cyan-500/30 border border-cyan-500/30 rounded-lg text-xs text-cyan-300 flex items-center gap-1.5 transition-colors"
-          >
-            <Download size={14} />
-            下载 SVG
-          </button>
-          <button
-            onClick={handleDownloadCode}
-            className="px-3 py-1.5 bg-cyan-500/20 hover:bg-cyan-500/30 border border-cyan-500/30 rounded-lg text-xs text-cyan-300 flex items-center gap-1.5 transition-colors"
-          >
-            <Download size={14} />
-            下载代码
-          </button>
-        </div>
-      </div>
-
-      {showCode ? (
-        <div className="bg-white/5 border border-white/10 rounded-lg p-4">
-          <div className="text-xs text-gray-400 mb-2">Mermaid 代码:</div>
-          <pre className="text-xs text-gray-300 bg-black/40 p-3 rounded overflow-x-auto max-h-96">
-            {mermaidCode}
-          </pre>
-        </div>
-      ) : (
-        <div className="bg-white/5 border border-white/10 rounded-lg p-6">
-          {renderError ? (
-            <div className="text-center py-8">
-              <div className="text-red-400 text-sm mb-2">渲染失败</div>
-              <div className="text-xs text-gray-500">{renderError}</div>
-              <button
-                onClick={() => setShowCode(true)}
-                className="mt-4 text-xs text-cyan-400 hover:text-cyan-300"
-              >
-                查看原始代码
-              </button>
-            </div>
-          ) : (
-            <div
-              ref={mermaidRef}
-              className="flex items-center justify-center overflow-x-auto"
-              style={{ minHeight: '200px' }}
-            />
-          )}
-        </div>
-      )}
-
-      <div className="mt-3 text-xs text-gray-500">
-        提示: 您可以切换查看图形或代码，也可以下载 SVG 文件或 Mermaid 代码文件
-      </div>
-
-      {showModal && createPortal(
-        <div
-          className="fixed inset-0 z-[200] bg-black/60 backdrop-blur-md flex items-center justify-center p-6"
-          onClick={() => setShowModal(false)}
-        >
-          <div
-            className="w-[92vw] h-[90vh] max-w-none bg-[#0b0b1a] border border-white/10 rounded-2xl shadow-2xl overflow-hidden flex flex-col"
-            onClick={e => e.stopPropagation()}
-          >
-            <div className="flex items-center justify-between px-4 py-3 border-b border-white/10">
-              <div className="text-sm text-gray-300">思维导图放大预览</div>
-              <div className="flex items-center gap-2">
-                <button
-                  onClick={() => setZoom(prev => clampZoom(prev * 0.9))}
-                  className="px-2 py-1 text-xs rounded-lg bg-white/5 hover:bg-white/10 text-gray-300"
-                >
-                  缩小
-                </button>
-                <button
-                  onClick={() => setZoom(prev => clampZoom(prev * 1.1))}
-                  className="px-2 py-1 text-xs rounded-lg bg-white/5 hover:bg-white/10 text-gray-300"
-                >
-                  放大
-                </button>
-                <button
-                  onClick={() => {
-                    setZoom(1);
-                    setOffset({ x: 0, y: 0 });
-                  }}
-                  className="px-2 py-1 text-xs rounded-lg bg-white/5 hover:bg-white/10 text-gray-300"
-                >
-                  复位
-                </button>
-                <button
-                  onClick={() => setShowModal(false)}
-                  className="p-2 rounded-lg text-gray-400 hover:text-white hover:bg-white/10 transition-colors"
-                >
-                  <X size={18} />
-                </button>
-              </div>
-            </div>
-            <div
-              className="flex-1 overflow-hidden p-6"
-              onWheel={handleWheel}
-              onMouseDown={handleMouseDown}
-              onMouseMove={handleMouseMove}
-              onMouseUp={handleMouseUp}
-              onMouseLeave={handleMouseUp}
-              style={{ cursor: isDragging ? 'grabbing' : 'grab' }}
-            >
-              {modalSvg ? (
-                <div className="w-full h-full flex items-center justify-center">
-                  <div
-                    style={{
-                      transform: `translate(${offset.x}px, ${offset.y}px) scale(${zoom})`,
-                      transformOrigin: 'center center'
-                    }}
-                    dangerouslySetInnerHTML={{ __html: modalSvg }}
-                  />
-                </div>
-              ) : (
-                <div className="text-sm text-gray-500">暂无可预览内容</div>
-              )}
-            </div>
-          </div>
-        </div>,
-        document.body
-      )}
-    </div>
-  );
-};
diff --git a/frontend_zh/src/components/knowledge-base/tools/MindMapPreview.tsx b/frontend_zh/src/components/knowledge-base/tools/MindMapPreview.tsx
new file mode 100644
index 0000000..fbde818
--- /dev/null
+++ b/frontend_zh/src/components/knowledge-base/tools/MindMapPreview.tsx
@@ -0,0 +1,302 @@
+import { useEffect, useRef, useState, useCallback } from 'react';
+import MindMap from 'simple-mind-map';
+import Export from 'simple-mind-map/src/plugins/Export.js';
+import { transformMarkdownTo } from 'simple-mind-map/src/parse/markdownTo.js';
+import { Download, Expand, Shrink, ZoomIn, ZoomOut, Maximize2, MessageSquare, FileText, Code } from 'lucide-react';
+import { mermaidToMarkdown, isMermaidMindmap, markdownToMermaid } from '../../../utils/mermaidToMarkdown';
+
+MindMap.usePlugin(Export);
+
+interface MindMapPreviewProps {
+  mermaidCode: string;
+  title?: string;
+  onNodeClick?: (nodeText: string) => void;
+}
+
+export const MindMapPreview = ({ mermaidCode, title = "思维导图预览", onNodeClick }: MindMapPreviewProps) => {
+  const containerRef = useRef<HTMLDivElement>(null);
+  const mindMapRef = useRef<MindMap | null>(null);
+  const [renderError, setRenderError] = useState<string | null>(null);
+  const [isReady, setIsReady] = useState(false);
+  const [tooltip, setTooltip] = useState<{ text: string; x: number; y: number } | null>(null);
+  const [askMenu, setAskMenu] = useState<{ nodeText: string; parentText: string; x: number; y: number } | null>(null);
+
+  const parseData = useCallback(() => {
+    if (!mermaidCode) return null;
+    try {
+      const markdown = isMermaidMindmap(mermaidCode)
+        ? mermaidToMarkdown(mermaidCode)
+        : mermaidCode;
+      return transformMarkdownTo(markdown);
+    } catch {
+      return null;
+    }
+  }, [mermaidCode]);
+
+  useEffect(() => {
+    if (!containerRef.current || !mermaidCode) return;
+
+    const data = parseData();
+    if (!data) {
+      setRenderError('解析思维导图数据失败');
+      return;
+    }
+
+    setRenderError(null);
+
+    if (mindMapRef.current) {
+      mindMapRef.current.destroy();
+      mindMapRef.current = null;
+      setIsReady(false);
+    }
+
+    try {
+      const mm = new MindMap({
+        el: containerRef.current,
+        data,
+        theme: 'default',
+        layout: 'logicalStructure',
+        scaleRatio: 0.1,
+        minZoomRatio: 20,
+        maxZoomRatio: 500,
+        readonly: true,
+        enableFreeDrag: false,
+        alwaysShowExpandBtn: true,
+        initRootNodePosition: ['center', 'center'],
+        exportPaddingX: 20,
+        exportPaddingY: 20,
+      });
+
+      mindMapRef.current = mm;
+
+      if (onNodeClick) {
+        mm.on('node_click', (node: any, e: any) => {
+          console.log('[MindMap] node_click fired', { node, e, nodeData: node?.nodeData, text: node?.nodeData?.data?.text });
+          console.log('[MindMap] event keys:', e ? Object.keys(e) : 'null');
+          const text = node?.nodeData?.data?.text;
+          if (!text) return;
+          setTooltip(null);
+          const parentText = node?.parent?.nodeData?.data?.text || '';
+          const raw = e?.originEvent || e?.event || e;
+          console.log('[MindMap] raw event:', raw, 'clientX:', raw?.clientX);
+          const rect = containerRef.current?.getBoundingClientRect();
+          if (rect && raw?.clientX != null) {
+            setAskMenu({
+              nodeText: text,
+              parentText,
+              x: raw.clientX - rect.left,
+              y: raw.clientY - rect.top,
+            });
+          } else if (rect) {
+            // Fallback: center of container
+            setAskMenu({
+              nodeText: text,
+              parentText,
+              x: rect.width / 2,
+              y: rect.height / 2,
+            });
+          }
+        });
+        mm.on('node_mouseenter', (node: any, e: any) => {
+          const text = node?.nodeData?.data?.text;
+          if (text) {
+            const raw = e?.originEvent || e?.event || e;
+            const rect = containerRef.current?.getBoundingClientRect();
+            if (rect && raw?.clientX != null) {
+              setTooltip({
+                text: '点击提问',
+                x: raw.clientX - rect.left,
+                y: raw.clientY - rect.top - 36,
+              });
+            }
+          }
+        });
+        mm.on('node_mouseleave', () => {
+          setTooltip(null);
+        });
+      }
+
+      // Only fit on initial render, not on expand/collapse
+      let firstRender = true;
+      mm.on('node_tree_render_end', () => {
+        if (firstRender) {
+          firstRender = false;
+          setIsReady(true);
+          setTimeout(() => mm.view.fit(), 100);
+        }
+      });
+    } catch (e: any) {
+      console.error('MindMap render error:', e);
+      setRenderError(e.message || '渲染思维导图失败');
+    }
+
+    return () => {
+      if (mindMapRef.current) {
+        mindMapRef.current.destroy();
+        mindMapRef.current = null;
+      }
+    };
+  }, [mermaidCode]);
+
+  const handleExpandAll = () => {
+    mindMapRef.current?.execCommand('EXPAND_ALL');
+  };
+
+  const handleCollapseAll = () => {
+    mindMapRef.current?.execCommand('UNEXPAND_ALL');
+  };
+
+  const handleZoomIn = () => mindMapRef.current?.view.enlarge();
+  const handleZoomOut = () => mindMapRef.current?.view.narrow();
+  const handleFit = () => mindMapRef.current?.view.fit();
+
+  const handleDownloadPng = async () => {
+    if (!mindMapRef.current) return;
+    try {
+      // Save current view state
+      const viewState = mindMapRef.current.view.getTransformData();
+      const fullData = mindMapRef.current.getData();
+      // Expand all for export
+      mindMapRef.current.execCommand('EXPAND_ALL');
+      await new Promise(r => setTimeout(r, 500));
+      await mindMapRef.current.export('png', true, `mindmap_${Date.now()}`);
+      // Restore previous state
+      mindMapRef.current.setData(fullData);
+      await new Promise(r => setTimeout(r, 300));
+      mindMapRef.current.view.setTransformData(viewState);
+    } catch (e) {
+      console.error('PNG export failed:', e);
+    }
+  };
+
+  const handleDownloadTxt = async () => {
+    if (!mindMapRef.current) return;
+    try {
+      await mindMapRef.current.export('txt', true, `mindmap_${Date.now()}`);
+    } catch (e) {
+      console.error('TXT export failed:', e);
+    }
+  };
+
+  const handleDownloadMermaid = () => {
+    const mermaid = isMermaidMindmap(mermaidCode)
+      ? mermaidCode
+      : markdownToMermaid(mermaidCode);
+    const blob = new Blob([mermaid], { type: 'text/plain' });
+    const url = URL.createObjectURL(blob);
+    const link = document.createElement('a');
+    link.href = url;
+    link.download = `mindmap_${Date.now()}.mmd`;
+    document.body.appendChild(link);
+    link.click();
+    document.body.removeChild(link);
+    URL.revokeObjectURL(url);
+  };
+
+  const btnBase = "px-2.5 py-1.5 rounded-lg text-xs flex items-center gap-1.5 transition-colors";
+  const btnGhost = `${btnBase} bg-gray-100 hover:bg-gray-200 border border-gray-200 text-gray-600`;
+  const btnAccent = `${btnBase} bg-cyan-50 hover:bg-cyan-100 border border-cyan-200 text-cyan-700`;
+
+  return (
+    <div className="pt-4">
+      <div className="flex items-center justify-between mb-3">
+        <h4 className="text-sm font-semibold text-gray-700">{title}</h4>
+      </div>
+
+      {/* 工具栏 */}
+      <div className="flex flex-wrap items-center gap-2 mb-4">
+        <button onClick={handleExpandAll} className={btnGhost} title="展开全部">
+          <Expand size={14} /> 展开全部
+        </button>
+        <button onClick={handleCollapseAll} className={btnGhost} title="收缩全部">
+          <Shrink size={14} /> 收缩全部
+        </button>
+        <button onClick={handleZoomIn} className={btnGhost} title="放大">
+          <ZoomIn size={14} />
+        </button>
+        <button onClick={handleZoomOut} className={btnGhost} title="缩小">
+          <ZoomOut size={14} />
+        </button>
+        <button onClick={handleFit} className={btnGhost} title="适应画布">
+          <Maximize2 size={14} /> 适应
+        </button>
+
+        <div className="w-px h-5 bg-gray-200 mx-1" />
+
+        <button onClick={handleDownloadPng} className={btnAccent} title="下载 PNG（全部展开）">
+          <Download size={14} /> PNG
+        </button>
+        <button onClick={handleDownloadTxt} className={btnAccent} title="下载层级文本">
+          <FileText size={14} /> 文本
+        </button>
+        <button onClick={handleDownloadMermaid} className={btnAccent} title="下载 Mermaid 代码">
+          <Code size={14} /> Mermaid
+        </button>
+      </div>
+
+      {renderError ? (
+        <div className="bg-red-50 border border-red-200 rounded-xl p-6 text-center">
+          <div className="text-red-600 text-sm mb-2">渲染失败</div>
+          <div className="text-xs text-red-400">{renderError}</div>
+        </div>
+      ) : (
+        <div className="relative">
+          <div
+            ref={containerRef}
+            className="bg-white border border-gray-200 rounded-xl overflow-hidden shadow-sm"
+            style={{ width: '100%', height: '500px', cursor: onNodeClick ? 'pointer' : 'default' }}
+          />
+          {tooltip && !askMenu && (
+            <div
+              className="absolute pointer-events-none z-50 px-2.5 py-1.5 bg-gray-800 text-white text-xs rounded-lg shadow-lg whitespace-nowrap"
+              style={{ left: tooltip.x, top: tooltip.y, transform: 'translateX(-50%)' }}
+            >
+              {tooltip.text}
+            </div>
+          )}
+        </div>
+      )}
+
+      {/* Ask menu — rendered outside container to avoid overflow clipping */}
+      {askMenu && onNodeClick && (
+        <>
+          <div className="fixed inset-0 z-[100]" onClick={() => setAskMenu(null)} />
+          <div
+            className="fixed z-[101] w-80 bg-white border border-gray-200 rounded-xl shadow-xl p-2 space-y-1"
+            style={{ left: askMenu.x + (containerRef.current?.getBoundingClientRect()?.left || 0), top: askMenu.y + (containerRef.current?.getBoundingClientRect()?.top || 0) + 8 }}
+          >
+            <div className="px-3 py-1.5 text-xs text-gray-400 font-medium">针对「{askMenu.nodeText}」提问</div>
+            <button
+              className="w-full text-left px-3 py-2 text-sm text-gray-700 hover:bg-cyan-50 hover:text-cyan-700 rounded-lg transition-colors"
+              onClick={() => {
+                onNodeClick(`讨论这些来源对「${askMenu.nodeText}」的看法。`);
+                setAskMenu(null);
+              }}
+            >
+              <MessageSquare size={14} className="inline mr-2 text-cyan-500" />
+              讨论这些来源对「{askMenu.nodeText}」的看法
+            </button>
+            {askMenu.parentText && (
+              <button
+                className="w-full text-left px-3 py-2 text-sm text-gray-700 hover:bg-cyan-50 hover:text-cyan-700 rounded-lg transition-colors"
+                onClick={() => {
+                  onNodeClick(`在更大的「${askMenu.parentText}」背景范畴下，讨论这些来源对「${askMenu.nodeText}」的看法。`);
+                  setAskMenu(null);
+                }}
+              >
+                <MessageSquare size={14} className="inline mr-2 text-cyan-500" />
+                在「{askMenu.parentText}」背景下，讨论对「{askMenu.nodeText}」的看法
+              </button>
+            )}
+          </div>
+        </>
+      )}
+
+      <div className="mt-3 text-xs text-gray-400">
+        {onNodeClick
+          ? '提示：滚轮缩放，拖拽平移。点击节点可发起提问。'
+          : '提示：滚轮缩放，拖拽平移。点击节点旁按钮可展开/收缩。'}
+      </div>
+    </div>
+  );
+};
diff --git a/frontend_zh/src/pages/NotebookView.tsx b/frontend_zh/src/pages/NotebookView.tsx
index 64c76bd..8019b3a 100644
--- a/frontend_zh/src/pages/NotebookView.tsx
+++ b/frontend_zh/src/pages/NotebookView.tsx
@@ -1,4 +1,4 @@
-import React, { useState, useEffect } from 'react';
+import React, { useState, useEffect, useCallback } from 'react';
 import { motion, AnimatePresence } from 'framer-motion';
 import {
   ChevronLeft, Plus, Share2, Settings, MessageSquare,
@@ -13,7 +13,7 @@ import { getApiSettings } from '../services/apiSettingsService';
 import { fetchWithCache, invalidateCacheByPrefix } from '../services/clientCache';
 import type { KnowledgeFile, ChatMessage, ToolType } from '../types';
 import ReactMarkdown from 'react-markdown';
-import { MermaidPreview } from '../components/knowledge-base/tools/MermaidPreview';
+import { MindMapPreview } from '../components/knowledge-base/tools/MindMapPreview';
 import { SettingsModal } from '../components/SettingsModal';
 import DrawioInlineEditor from '../components/DrawioInlineEditor';
 import { FlashcardViewer } from '../components/flashcards/FlashcardViewer';
@@ -175,6 +175,16 @@ const NotebookView = ({ notebook, onBack }: { notebook: any, onBack: () => void
   const chatPersistSkippedRef = React.useRef(false);
   const conversationIdRef = React.useRef<string | null>(null);
   const [inputMsg, setInputMsg] = useState('');
+  const handleMindmapNodeClick = useCallback((question: string) => {
+    setInputMsg(question);
+    setActiveTool('chat');
+    setChatSubView('current');
+    setPreviewOutput(null);
+    setTimeout(() => {
+      const input = document.querySelector<HTMLInputElement>('input[type="text"]');
+      input?.focus();
+    }, 100);
+  }, []);
   const [isChatLoading, setIsChatLoading] = useState(false);
   const [dataExtractDatasources, setDataExtractDatasources] = useState<DataExtractDatasource[]>([]);
   const [dataExtractDatasourceId, setDataExtractDatasourceId] = useState<string>('');
@@ -4084,7 +4094,7 @@ const NotebookView = ({ notebook, onBack }: { notebook: any, onBack: () => void
 
             {toolOutput && activeTool === 'mindmap' && toolOutput.mindmap_code && (
               <div className="bg-white border border-gray-200 rounded-xl p-4">
-                <MermaidPreview mermaidCode={toolOutput.mindmap_code} title="思维导图" />
+                <MindMapPreview mermaidCode={toolOutput.mindmap_code} title="思维导图" onNodeClick={handleMindmapNodeClick} />
               </div>
             )}
 
@@ -4598,14 +4608,14 @@ const NotebookView = ({ notebook, onBack }: { notebook: any, onBack: () => void
             initial={{ opacity: 0 }}
             animate={{ opacity: 1 }}
             exit={{ opacity: 0 }}
-            className="absolute inset-0 glass-dark"
+            className="absolute inset-0 bg-black/40 backdrop-blur-sm"
           />
           <motion.div
             initial={{ y: 100, opacity: 0 }}
             animate={{ y: 0, opacity: 1 }}
             exit={{ y: 100, opacity: 0 }}
             transition={{ type: 'spring', stiffness: 300, damping: 30 }}
-            className={`relative bg-white rounded-t-ios-2xl sm:rounded-ios-2xl shadow-ios-xl border border-ios-gray-100 overflow-hidden flex flex-col ${
+            className={`relative bg-white rounded-t-2xl sm:rounded-2xl shadow-xl border border-gray-200 overflow-hidden flex flex-col ${
               previewOutput.type === 'drawio'
                 ? 'w-[95vw] h-[95vh] min-w-[320px] min-h-[360px]'
                 : 'w-[90vw] h-[90vh] max-w-[1600px] max-h-[90vh] min-w-[320px] min-h-[360px]'
@@ -4613,7 +4623,7 @@ const NotebookView = ({ notebook, onBack }: { notebook: any, onBack: () => void
             onClick={(e) => e.stopPropagation()}
           >
             {/* Header */}
-            <div className="flex items-center justify-between px-4 py-3 border-b border-ios-gray-100 bg-white shrink-0">
+            <div className="flex items-center justify-between px-4 py-3 border-b border-gray-200 bg-white shrink-0">
               <div>
                 <h2 className="text-lg font-semibold text-ios-gray-800">{previewOutput.title}</h2>
                 <p className="text-xs text-ios-gray-500 mt-1">来源：{previewOutput.sources}</p>
@@ -4716,9 +4726,10 @@ const NotebookView = ({ notebook, onBack }: { notebook: any, onBack: () => void
               {previewOutput.type === 'mindmap' && previewOutput.mermaidCode && (
                 <div className="h-full flex items-center justify-center">
                   <div className="w-full h-full bg-white rounded-xl shadow-lg p-6">
-                    <MermaidPreview 
-                      mermaidCode={previewOutput.mermaidCode} 
-                      title="思维导图预览" 
+                    <MindMapPreview
+                      mermaidCode={previewOutput.mermaidCode}
+                      title="思维导图预览"
+                      onNodeClick={handleMindmapNodeClick}
                     />
                   </div>
                 </div>

From 57647f08f6adb252197d2a7e03cca13fb6a246d8 Mon Sep 17 00:00:00 2001
From: Anion <1005128408@qq.com>
Date: Tue, 31 Mar 2026 15:35:40 +0800
Subject: [PATCH 5/6] refactor: remove hard max_depth limit from mindmap prompt

Let the LLM adapt depth to content complexity instead of enforcing
a fixed max_depth. The prompt structure already guides appropriate
depth through its description of 4 hierarchy levels.
---
 workflow_engine/state.py                  | 2 +-
 workflow_engine/workflow/wf_kb_mindmap.py | 3 +--
 2 files changed, 2 insertions(+), 3 deletions(-)

diff --git a/workflow_engine/state.py b/workflow_engine/state.py
index 676698e..5aeb279 100644
--- a/workflow_engine/state.py
+++ b/workflow_engine/state.py
@@ -474,7 +474,7 @@ class KBMindMapRequest(MainRequest):
     """
     file_ids: List[str] = field(default_factory=list)  # 引入层处理后的文件ID列表
     mindmap_style: str = "default"  # default | flowchart | tree
-    max_depth: int = 3  # 思维导图最大深度
+    max_depth: int = 4  # 思维导图最大深度（根节点 + 一级 + 二级 + 三级要点）
     vector_store_base_dir: Optional[str] = None  # 向量库根目录（manifest所在目录）
 
 @dataclass
diff --git a/workflow_engine/workflow/wf_kb_mindmap.py b/workflow_engine/workflow/wf_kb_mindmap.py
index 05552c6..1dbea9b 100644
--- a/workflow_engine/workflow/wf_kb_mindmap.py
+++ b/workflow_engine/workflow/wf_kb_mindmap.py
@@ -174,7 +174,6 @@ async def generate_mermaid_node(state: KBMindMapState) -> KBMindMapState:
             contents_str += f"=== {item['filename']} ===\n{item['content']}\n\n"
 
         language = state.request.language
-        max_depth = state.request.max_depth
 
         prompt = f"""请基于以下文档内容，生成一张**层级清晰、主题归纳明确、适合快速把握全文结构的思维导图**。你的目标是把文章压缩成一张"知识地图"，让读者能够迅速理解这篇文章的核心主题、主要模块、关键内容，以及各部分之间的层级关系。
 
@@ -188,7 +187,7 @@ async def generate_mermaid_node(state: KBMindMapState) -> KBMindMapState:
 
 当某个二级主题中存在特别重要的细节时，继续提炼 **1–3 个三级要点**（#### 四级标题），用于补充最关键的信息，例如术语、条件、指标、例子、判断依据、具体表现、限制条件、后续影响等。
 
-整体层级最多{max_depth}层。使用{language}语言。
+请根据内容复杂度自适应决定层级深度，不要人为限制。使用{language}语言。
 
 整张思维导图要体现出一种**知识整理型、结构概览型、主题分解型**的风格。重点是帮助读者快速理解全文内容版图，而不是只罗列摘要句子。请让结构体现出"从总到分、由主到次、层层展开"的组织逻辑。
 

From f790f49cc5668c245765dc0af334569ccbd2ef15 Mon Sep 17 00:00:00 2001
From: Anion <1005128408@qq.com>
Date: Tue, 31 Mar 2026 15:47:55 +0800
Subject: [PATCH 6/6] fix: refine mindmap prompt and hide redundant download
 button

- max_depth default to 6, layer depth driven by content complexity
- Remove example-heavy data instructions, keep core rule concise
- Hide modal download button for mindmap type (component has its own exports)
---
 frontend_en/src/pages/NotebookView.tsx    | 2 +-
 frontend_zh/src/pages/NotebookView.tsx    | 2 +-
 workflow_engine/state.py                  | 2 +-
 workflow_engine/workflow/wf_kb_mindmap.py | 9 +++++----
 4 files changed, 8 insertions(+), 7 deletions(-)

diff --git a/frontend_en/src/pages/NotebookView.tsx b/frontend_en/src/pages/NotebookView.tsx
index f35ea5f..88e2bff 100644
--- a/frontend_en/src/pages/NotebookView.tsx
+++ b/frontend_en/src/pages/NotebookView.tsx
@@ -3786,7 +3786,7 @@ const NotebookView = ({ notebook, onBack }: { notebook: any, onBack: () => void
                 <p className="text-xs text-ios-gray-500 mt-1">来源：{previewOutput.sources}</p>
               </div>
               <div className="flex items-center gap-2">
-                {previewOutput.url && (
+                {previewOutput.url && previewOutput.type !== 'mindmap' && (
                   <a
                     href={previewOutput.url}
                     target="_blank"
diff --git a/frontend_zh/src/pages/NotebookView.tsx b/frontend_zh/src/pages/NotebookView.tsx
index 8019b3a..6bb61eb 100644
--- a/frontend_zh/src/pages/NotebookView.tsx
+++ b/frontend_zh/src/pages/NotebookView.tsx
@@ -4629,7 +4629,7 @@ const NotebookView = ({ notebook, onBack }: { notebook: any, onBack: () => void
                 <p className="text-xs text-ios-gray-500 mt-1">来源：{previewOutput.sources}</p>
               </div>
               <div className="flex items-center gap-2">
-                {previewOutput.url && (
+                {previewOutput.url && previewOutput.type !== 'mindmap' && (
                   <a
                     href={previewOutput.url}
                     target="_blank"
diff --git a/workflow_engine/state.py b/workflow_engine/state.py
index 5aeb279..85c8c73 100644
--- a/workflow_engine/state.py
+++ b/workflow_engine/state.py
@@ -474,7 +474,7 @@ class KBMindMapRequest(MainRequest):
     """
     file_ids: List[str] = field(default_factory=list)  # 引入层处理后的文件ID列表
     mindmap_style: str = "default"  # default | flowchart | tree
-    max_depth: int = 4  # 思维导图最大深度（根节点 + 一级 + 二级 + 三级要点）
+    max_depth: int = 6  # 思维导图最大深度
     vector_store_base_dir: Optional[str] = None  # 向量库根目录（manifest所在目录）
 
 @dataclass
diff --git a/workflow_engine/workflow/wf_kb_mindmap.py b/workflow_engine/workflow/wf_kb_mindmap.py
index 1dbea9b..aeff471 100644
--- a/workflow_engine/workflow/wf_kb_mindmap.py
+++ b/workflow_engine/workflow/wf_kb_mindmap.py
@@ -174,6 +174,7 @@ async def generate_mermaid_node(state: KBMindMapState) -> KBMindMapState:
             contents_str += f"=== {item['filename']} ===\n{item['content']}\n\n"
 
         language = state.request.language
+        max_depth = state.request.max_depth
 
         prompt = f"""请基于以下文档内容，生成一张**层级清晰、主题归纳明确、适合快速把握全文结构的思维导图**。你的目标是把文章压缩成一张"知识地图"，让读者能够迅速理解这篇文章的核心主题、主要模块、关键内容，以及各部分之间的层级关系。
 
@@ -185,9 +186,7 @@ async def generate_mermaid_node(state: KBMindMapState) -> KBMindMapState:
 
 接着在每个一级主题下继续拆分 **2–4 个二级主题**（### 三级标题）。二级主题要承接上级主题，概括该部分最值得保留的核心内容，例如关键概念、主要论点、重要机制、核心步骤、代表性案例、主要证据、结果表现、应用场景、影响因素、行动建议等。
 
-当某个二级主题中存在特别重要的细节时，继续提炼 **1–3 个三级要点**（#### 四级标题），用于补充最关键的信息，例如术语、条件、指标、例子、判断依据、具体表现、限制条件、后续影响等。
-
-请根据内容复杂度自适应决定层级深度，不要人为限制。使用{language}语言。
+需要时继续向下拆分更细的层级，整体层级最多{max_depth}层（使用 # 到 {'#' * max_depth} 表示）。层级深度由内容复杂度决定，不必强制填满所有层级，也不要人为限制在某个固定层数。使用{language}语言。
 
 整张思维导图要体现出一种**知识整理型、结构概览型、主题分解型**的风格。重点是帮助读者快速理解全文内容版图，而不是只罗列摘要句子。请让结构体现出"从总到分、由主到次、层层展开"的组织逻辑。
 
@@ -201,8 +200,10 @@ async def generate_mermaid_node(state: KBMindMapState) -> KBMindMapState:
 
 节点命名请尽量简洁而有信息量。每个节点都使用**适合放入思维导图框中的短语式表达**，让人一眼就能理解该节点要表达的重点。
 
+**特别注意：节点内容必须包含原文中的具体数据和关键数字。** 不要用"显著提升"、"大幅改善"等模糊表述替代具体数字。如果原文有数据，节点就必须带数据。
+
 生成标准：
-1. 忠实反映原文主线
+1. 忠实反映原文主线，保留关键数据和定量结果
 2. 节点之间要有明确层级关系
 3. 同一级节点尽量保持并列、均衡、可比较
 4. 优先保留能够帮助理解全文框架的内容