UI升级,功能优化，代码拆分

.idea/protoPluginMemos.xml

@@ -0,0 +1,13 @@
+<?xml version="1.0" encoding="UTF-8"?>
+<project version="4">
+  <component name="ProtoPluginMemos">
+    <option name="items">
+      <list>
+        <MemoItem>
+          <option name="id" value="16a693e9-ab6a-479b-9f7d-b4af466ec8df" />
+          <option name="updated" value="1778858615003" />
+        </MemoItem>
+      </list>
+    </option>
+  </component>
+</project>

.idea/vcs.xml

@@ -0,0 +1,6 @@
+<?xml version="1.0" encoding="UTF-8"?>
+<project version="4">
+  <component name="VcsDirectoryMappings">
+    <mapping directory="" vcs="Git" />
+  </component>
+</project>

README.md

@@ -1,6 +1,37 @@
 # Huangzhijun's Reader
 
-本地 Markdown 阅读与编辑（Electron + Vite + React + CodeMirror 6）。侧重「长文阅读体验」与「轻量编辑」：多标签、会话恢复、侧栏文件树与大纲、阅读/编辑/分栏三模式、外观与行距可调。
+本地 Markdown 阅读与编辑器（Electron + Vite + React + CodeMirror 6）。侧重「长文阅读体验」与「轻量编辑」：多标签、会话恢复、侧栏文件树与大纲、阅读/编辑/分栏三模式、外观与行距可调。
+
+## 功能特性
+
+### 核心功能
+- **多标签编辑**：支持同时打开多个 Markdown 文件，标签页可拖拽排序
+- **三种视图模式**：编辑 / 阅读 / 分栏（编辑+预览），一键切换
+- **文件树浏览**：打开本地文件夹，侧栏展示目录结构，点击 `.md` / `.txt` 文件即可打开
+- **会话恢复**：关闭应用后重新打开，自动恢复上次的标签页、视图模式、外观设置
+- **文件历史**：记录最近打开过的 Markdown 文件路径，方便快速访问
+
+### 编辑功能
+- **Markdown 格式工具栏**：分组展示常用格式按钮（标题、格式、元素、列表、其他）
+- **语法高亮**：编辑器内 Markdown 语法高亮，代码块语言高亮
+- **图片插入**：支持插入本地图片，自动解析相对路径
+- **表格编辑**：支持 Markdown 表格的快速插入与格式化
+- **Mermaid 图表**：支持在 Markdown 中编写 Mermaid 语法，预览时自动渲染
+
+### 阅读体验
+- **多套背景主题**：提供多种阅读背景（含「Kindle 纸感」等），可自由切换
+- **字体选择**：支持多种中文字体，阅读区与编辑区字体独立设置
+- **行距调节**：阅读视图行距可精细调节（1.0–3.0）
+- **预览宽度调节**：阅读模式下可拖动调整正文最大宽度
+- **大纲导航**：自动解析文档标题层级，点击跳转到对应位置
+
+### 新增功能（v0.2.0）
+- **自动保存**：开启后，编辑内容在 3 秒无操作后自动保存到文件（仅对有文件路径的标签生效）
+- **拖放打开**：支持从系统文件管理器拖放 `.md` / `.txt` 文件到编辑区直接打开
+- **导出 HTML**：将当前 Markdown 文档导出为独立 HTML 文件，包含基本样式
+- **文档内搜索**：`Ctrl+F` 打开搜索栏，支持在编辑/阅读/分栏三种模式下搜索文档内容
+- **状态栏**：底部状态栏显示当前文档的行数、字符数（含/不含空白）、词数统计
+- **拖放视觉反馈**：拖放文件到编辑区时显示虚线边框高亮
 
 ## 设计思路
 
@@ -17,18 +48,25 @@
    编辑器与预览共享文档字符串；预览 DOM 为块级元素打上源行号，用于大纲跳转与分栏滚动对齐。
 
 5. **持久化**  
-   标签内容与未保存状态、当前背景/字体等写入 `localStorage`（会话键 `myreader-session-v1`）；打开过的 Markdown 路径记入「历史」列表，与真实文件删除无关。
+   标签内容与未保存状态、当前背景/字体等写入 `localStorage`（会话键 `myreader-session-v1`）；打开过的 Markdown 路径记入「历史」列表，与真实文件删除无关。自动保存开关状态持久化到 `localStorage`。
 
-## 使用步骤（简述）
+## 使用步骤
 
 1. **安装依赖**：在项目根目录执行 `npm install`。  
 2. **开发运行**：`npm run dev`，在 Electron 窗口内使用。  
-3. **打开文档**：工具栏「打开」、侧栏「打开文件夹」后点击 `.md` 文件，或从历史记录点选。  
-4. **视图**：工具栏「视图」或使用 `Ctrl+E` 在 **编辑 / 阅读 / 分栏** 间切换。  
-5. **外观**：工具栏右侧 **阅读行距**、**字体**、**背景**（含「Kindle 纸感」等）按需调整。  
-6. **图片**：编辑模式下用工具栏插入本地图片；保存路径为 `file://` 或相对路径时，阅读/分栏预览会按上文规则解析显示。  
-7. **图表**：在 Markdown 中使用 ` ```mermaid ` 围栏编写 Mermaid 语法即可在预览中渲染。  
-8. **构建与打包**：`npm run build` 输出到 `out/`；`npm run dist` 构建并生成 Windows 安装包至 `release/`。
+3. **打开文档**：
+   - 工具栏「打开」选择 `.md` 文件
+   - 侧栏「打开文件夹」后点击文件树中的 `.md` / `.txt` 文件
+   - 从历史记录点选
+   - **拖放** `.md` / `.txt` 文件到编辑区
+4. **视图切换**：工具栏「视图」按钮或 `Ctrl+E` 在 **编辑 / 阅读 / 分栏** 间循环切换。  
+5. **外观调整**：工具栏右侧可调节阅读行距、字体、背景（含「Kindle 纸感」等）。  
+6. **图片插入**：编辑模式下用工具栏插入本地图片；保存路径为 `file://` 或相对路径时，预览会按规则解析显示。  
+7. **Mermaid 图表**：使用 ` ```mermaid ` 围栏编写 Mermaid 语法即可在预览中渲染。  
+8. **自动保存**：工具栏「自动保存：开/关」按钮或 `Ctrl+Shift+F` 切换自动保存。  
+9. **导出 HTML**：工具栏「导出 HTML」按钮或 `Ctrl+Shift+E` 导出当前文档。  
+10. **文档搜索**：`Ctrl+F` 打开搜索栏，输入关键词后按 `Enter` 或点击 `↓` 按钮查找。  
+11. **构建与打包**：`npm run build` 输出到 `out/`；`npm run dist` 构建并生成 Windows 安装包至 `release/`。
 
 ## 脚本
 
@@ -36,19 +74,49 @@
 |------|------|
 | `npm run dev` | 开发调试 |
 | `npm run build` | 构建到 `out/` |
-| `npm run typecheck` | TypeScript 检查 |
+| `npm run typecheck` | TypeScript 类型检查 |
 | `npm run dist` | 构建并打 Windows 安装包（`release/`） |
 
-## 快捷键（与应用菜单一致）
+## 快捷键
 
-- `Ctrl+O` 打开，`Ctrl+S` 保存，`Ctrl+Shift+S` 另存为  
-- `Ctrl+T` 新标签，`Ctrl+W` 关闭标签  
-- `Ctrl+Tab` / `Ctrl+Shift+Tab` 切换标签  
-- `Ctrl+E`：在 **编辑 / 阅读 / 分栏** 三种视图间循环切换  
+### 文件操作
+| 快捷键 | 功能 |
+|--------|------|
+| `Ctrl+O` | 打开文件 |
+| `Ctrl+S` | 保存当前标签 |
+| `Ctrl+Shift+S` | 另存为 |
+| `Ctrl+Shift+O` | 打开文件夹 |
+| `Ctrl+Shift+R` | 刷新文件树 |
 
-侧栏可隐藏、可拖动右边缘调整宽度；阅读模式下可拖动预览区右缘调整正文最大宽度。编辑、分栏模式下顶部有 **Markdown 格式工具栏**。侧栏文件列表 **右键**：重命名（文件/文件夹）、删除（仅文件）。
+### 标签管理
+| 快捷键 | 功能 |
+|--------|------|
+| `Ctrl+N` | 新建标签 |
+| `Ctrl+W` | 关闭当前标签 |
+| `Ctrl+Tab` | 切换到下一个标签 |
+| `Ctrl+Shift+Tab` | 切换到上一个标签 |
+| `Ctrl+1`–`9` | 切换到第 1–9 个标签 |
 
-## 技术栈摘要
+### 视图与面板
+| 快捷键 | 功能 |
+|--------|------|
+| `Ctrl+E` | 循环切换视图模式（编辑/阅读/分栏） |
+| `Ctrl+B` | 显示/隐藏侧栏 |
+| `Ctrl+Shift+1` | 侧栏切换到文件树 |
+| `Ctrl+Shift+2` | 侧栏切换到历史记录 |
+| `Ctrl+Shift+3` | 侧栏切换到大纲 |
+
+### 工具
+| 快捷键 | 功能 |
+|--------|------|
+| `Ctrl+F` | 打开/关闭文档搜索 |
+| `Ctrl+Shift+F` | 切换自动保存 |
+| `Ctrl+Shift+E` | 导出为 HTML |
+| `Esc` | 关闭搜索栏 |
+
+侧栏可隐藏、可拖动右边缘调整宽度；阅读模式下可拖动预览区右缘调整正文最大宽度。编辑、分栏模式下顶部有 **Markdown 格式工具栏**（按功能分组）。侧栏文件列表 **右键**：重命名（文件/文件夹）、删除（仅文件）。
+
+## 技术栈
 
 Electron 35、electron-vite、React 19、CodeMirror 6、markdown-it、highlight.js、DOMPurify、mermaid。
 

src/renderer/src/App.tsx

@@ -2,7 +2,6 @@ import * as React from 'react'
 import { EditorPane, type MarkdownEditorHandle } from './EditorPane'
 import type { EditorView } from '@codemirror/view'
 import { MarkdownFormatToolbar } from './MarkdownFormatToolbar'
-import { OutlinePanel } from './OutlinePanel'
 import { PreviewArticle } from './PreviewArticle'
 import {
   extractOutline,
@@ -13,82 +12,24 @@ import {
 } from './markdown'
 import {
   addFileHistory,
-  historyFileName,
   loadFileHistory,
   removeFileHistory
 } from './fileHistory'
 import { BACKGROUNDS, FONTS, validBackgroundId, validFontId, type ViewMode } from './appearance'
 import { COLOR_SWATCH_ROWS } from './colorPresets'
-
-type Tab = {
-  id: string
-  filePath: string | null
-  content: string
-  savedContent: string
-}
-
-const BG_KEY = 'myreader-bg-id'
-const FONT_KEY = 'myreader-font-id'
-const VIEW_KEY = 'myreader-view'
-const LEGACY_READ_KEY = 'myreader-read'
-const BROWSE_KEY = 'myreader-browse'
-const SIDEBAR_W_KEY = 'myreader-sidebar-w'
-const SIDEBAR_HIDDEN_KEY = 'myreader-sidebar-hidden'
-const SPLIT_KEY = 'myreader-split'
-const PREVIEW_W_KEY = 'myreader-preview-max'
-const SESSION_KEY = 'myreader-session-v1'
-const PREVIEW_LINE_KEY = 'myreader-preview-line-height'
-
-function loadPreviewLineHeight(): string {
-  const raw = localStorage.getItem(PREVIEW_LINE_KEY)
-  if (!raw) return '1.5'
-  const n = Number.parseFloat(raw)
-  if (!Number.isFinite(n)) return '1.5'
-  return String(Math.min(3, Math.max(1, n)))
-}
+import type { Tab } from './types'
+import { clamp, newTab, tabLabel, isDirty, loadViewMode, viewModeLabel, loadPreviewLineHeight, normalizePathKey } from './utils'
+import {
+  BG_KEY, FONT_KEY, VIEW_KEY, BROWSE_KEY, SIDEBAR_W_KEY, SIDEBAR_HIDDEN_KEY,
+  STATS_W_KEY, STATS_HIDDEN_KEY, SPLIT_KEY, PREVIEW_W_KEY, PREVIEW_LINE_KEY, SESSION_KEY, AUTO_SAVE_KEY
+} from './constants'
+import { TabBar } from './TabBar'
+import { Sidebar } from './Sidebar'
+import { StatsPanel } from './StatsPanel'
 
 type SessionTabRow = { path: string | null; content: string; saved: string }
 type SessionV1 = { v: 1; activeIndex: number; tabs: SessionTabRow[]; bgId?: string; fontId?: string }
 
-function clamp(n: number, min: number, max: number): number {
-  return Math.min(max, Math.max(min, n))
-}
-
-function normalizePathKey(p: string): string {
-  return p.replace(/\\/g, '/').toLowerCase()
-}
-
-function newTab(): Tab {
-  const id = crypto.randomUUID()
-  return { id, filePath: null, content: '', savedContent: '' }
-}
-
-function tabLabel(t: Tab): string {
-  if (t.filePath) {
-    const parts = t.filePath.split(/[/\\]/)
-    return parts[parts.length - 1] || t.filePath
-  }
-  return '未命名'
-}
-
-function isDirty(t: Tab): boolean {
-  return t.content !== t.savedContent
-}
-
-function loadViewMode(): ViewMode {
-  const v = localStorage.getItem(VIEW_KEY) as ViewMode | null
-  if (v === 'edit' || v === 'read' || v === 'hybrid') return v
-  if (localStorage.getItem(LEGACY_READ_KEY) === '1') return 'read'
-  if (localStorage.getItem(LEGACY_READ_KEY) === '0') return 'edit'
-  return 'read'
-}
-
-function viewModeLabel(m: ViewMode): string {
-  if (m === 'edit') return '编辑'
-  if (m === 'read') return '阅读'
-  return '分栏'
-}
-
 export default function App(): React.ReactElement {
   const api = window.myreader
   const editorRef = React.useRef<MarkdownEditorHandle | null>(null)
@@ -123,6 +64,13 @@ export default function App(): React.ReactElement {
     const n = Number(localStorage.getItem(SIDEBAR_W_KEY) ?? '260')
     return Number.isFinite(n) ? clamp(n, 160, 560) : 260
   })
+  const [statsWidth, setStatsWidth] = React.useState<number>(() => {
+    const n = Number(localStorage.getItem(STATS_W_KEY) ?? '220')
+    return Number.isFinite(n) ? clamp(n, 160, 400) : 220
+  })
+  const [statsHidden, setStatsHidden] = React.useState<boolean>(
+    () => localStorage.getItem(STATS_HIDDEN_KEY) === '1'
+  )
   const [splitPct, setSplitPct] = React.useState<number>(() => {
     const n = Number(localStorage.getItem(SPLIT_KEY) ?? '48')
     return Number.isFinite(n) ? clamp(n, 22, 78) : 48
@@ -170,6 +118,13 @@ export default function App(): React.ReactElement {
     topPx: number
     seq: number
   } | null>(null)
+  const [autoSave, setAutoSave] = React.useState<boolean>(
+    () => localStorage.getItem(AUTO_SAVE_KEY) === '1'
+  )
+  const [statusText, setStatusText] = React.useState('')
+  const [searchVisible, setSearchVisible] = React.useState(false)
+  const [searchQuery, setSearchQuery] = React.useState('')
+  const [dragOver, setDragOver] = React.useState(false)
 
   const activeTab = tabs.find((t) => t.id === activeId) ?? null
   const activeDoc = activeTab?.content ?? ''
@@ -322,6 +277,14 @@ export default function App(): React.ReactElement {
     localStorage.setItem(SIDEBAR_W_KEY, String(sidebarWidth))
   }, [sidebarWidth])
 
+  React.useEffect(() => {
+    localStorage.setItem(STATS_W_KEY, String(statsWidth))
+  }, [statsWidth])
+
+  React.useEffect(() => {
+    localStorage.setItem(STATS_HIDDEN_KEY, statsHidden ? '1' : '0')
+  }, [statsHidden])
+
   React.useEffect(() => {
     localStorage.setItem(SPLIT_KEY, String(splitPct))
   }, [splitPct])
@@ -334,13 +297,29 @@ export default function App(): React.ReactElement {
     if (browseDir) localStorage.setItem(BROWSE_KEY, browseDir)
   }, [browseDir])
 
+  React.useEffect(() => {
+    localStorage.setItem(AUTO_SAVE_KEY, autoSave ? '1' : '0')
+  }, [autoSave])
+
+  React.useEffect(() => {
+    if (!activeDoc) {
+      setStatusText('')
+      return
+    }
+    setStatusText('')
+  }, [activeDoc, activeLineCount])
+
   React.useEffect(() => {
     const onDoc = (): void => {
       setCtxMenu(null)
       setHistCtxMenu(null)
     }
     window.addEventListener('mousedown', onDoc)
-    return () => window.removeEventListener('mousedown', onDoc)
+    window.addEventListener('scroll', onDoc, true)
+    return () => {
+      window.removeEventListener('mousedown', onDoc)
+      window.removeEventListener('scroll', onDoc, true)
+    }
   }, [])
 
   React.useEffect(() => {
@@ -585,12 +564,13 @@ export default function App(): React.ReactElement {
     if (!api) return
     const r = await api.openFileDialog()
     if (r.canceled || !r.path || r.content === undefined) return
+    const parent = await api.parentDirectory(r.path)
+    setBrowseDir(parent)
     const existing = tabsRef.current.find(
-      (t) => r.path && t.filePath && normalizePathKey(t.filePath) === normalizePathKey(r.path)
+      (t) => t.filePath && normalizePathKey(t.filePath) === normalizePathKey(r.path!)
     )
     if (existing) {
       setActiveId(existing.id)
-      setBrowseDir(await api.parentDirectory(r.path))
       recordFileOpen(r.path)
       return
     }
@@ -634,9 +614,21 @@ export default function App(): React.ReactElement {
     await saveTabById(activeId)
   }, [activeId, saveTabById])
 
+  React.useEffect(() => {
+    if (!autoSave || !activeId) return
+    const t = tabsRef.current.find((x) => x.id === activeId)
+    if (!t || !t.filePath || !isDirty(t)) return
+    const timer = window.setTimeout(() => {
+      void saveTabById(activeId)
+      setStatusText('已自动保存')
+      window.setTimeout(() => setStatusText(''), 2000)
+    }, 3000)
+    return () => window.clearTimeout(timer)
+  }, [activeDoc, autoSave, activeId, saveTabById])
+
   const saveActiveAs = React.useCallback(async (): Promise<void> => {
     if (!api) return
-    const t = tabs.find((x) => x.id === activeId)
+    const t = tabsRef.current.find((x) => x.id === activeId)
     if (!t) return
     const d = await api.saveFileDialog(t.filePath ?? undefined)
     if (d.canceled || !d.path) return
@@ -646,7 +638,7 @@ export default function App(): React.ReactElement {
         x.id === activeId ? { ...x, filePath: d.path!, savedContent: x.content } : x
       )
     )
-  }, [api, activeId, tabs])
+  }, [api, activeId])
 
   const removeTabById = React.useCallback((tabId: string): void => {
     setTabs((prev) => {
@@ -676,6 +668,19 @@ export default function App(): React.ReactElement {
     [removeTabById]
   )
 
+  const closeOtherTabs = React.useCallback(
+    (tabId: string): void => {
+      setTabs((prev) => prev.filter((t) => t.id === tabId))
+      setActiveId(tabId)
+    },
+    []
+  )
+
+  const closeAllTabs = React.useCallback((): void => {
+    setTabs([])
+    setActiveId('')
+  }, [])
+
   const newTabAction = React.useCallback((): void => {
     setViewMode('edit')
     const nt = newTab()
@@ -712,12 +717,6 @@ export default function App(): React.ReactElement {
     setBrowseDir(r.path)
   }, [api])
 
-  const goParent = React.useCallback(async (): Promise<void> => {
-    if (!api || !browseDir || parentDisabled) return
-    const p = await api.parentDirectory(browseDir)
-    if (p !== browseDir) setBrowseDir(p)
-  }, [api, browseDir, parentDisabled])
-
   const startSidebarResize = React.useCallback((e: React.MouseEvent): void => {
     e.preventDefault()
     const startX = e.clientX
@@ -733,6 +732,21 @@ export default function App(): React.ReactElement {
     document.addEventListener('mouseup', onUp)
   }, [sidebarWidth])
 
+  const startStatsResize = React.useCallback((e: React.MouseEvent): void => {
+    e.preventDefault()
+    const startX = e.clientX
+    const startW = statsWidth
+    const onMove = (ev: MouseEvent): void => {
+      setStatsWidth(clamp(startW - (ev.clientX - startX), 160, 400))
+    }
+    const onUp = (): void => {
+      document.removeEventListener('mousemove', onMove)
+      document.removeEventListener('mouseup', onUp)
+    }
+    document.addEventListener('mousemove', onMove)
+    document.addEventListener('mouseup', onUp)
+  }, [statsWidth])
+
   const startHybridSplitResize = React.useCallback((e: React.MouseEvent): void => {
     e.preventDefault()
     const shell = (e.currentTarget as HTMLElement).closest('.hybrid-row')
@@ -770,6 +784,105 @@ export default function App(): React.ReactElement {
     [previewMaxWidth]
   )
 
+  const handleDrop = React.useCallback(
+    async (e: React.DragEvent): Promise<void> => {
+      e.preventDefault()
+      e.stopPropagation()
+      setDragOver(false)
+      const files = e.dataTransfer.files
+      if (!files || files.length === 0) return
+      for (let i = 0; i < files.length; i++) {
+        const file = files[i]
+        if (!file) continue
+        if (/\.(md|markdown|mdown|mkd|txt)$/i.test(file.name)) {
+          try {
+            const content = await file.text()
+            const filePath: string | null = (file as { path?: string }).path ?? null
+            if (filePath) {
+              const key = normalizePathKey(filePath)
+              const existing = tabsRef.current.find(
+                (t) => t.filePath && normalizePathKey(t.filePath) === key
+              )
+              if (existing) {
+                setActiveId(existing.id)
+                if (api) {
+                  const parent = await api.parentDirectory(filePath)
+                  setBrowseDir(parent)
+                }
+                continue
+              }
+            }
+            const nt: Tab = {
+              id: crypto.randomUUID(),
+              filePath: filePath ?? file.name,
+              content,
+              savedContent: content
+            }
+            setTabs((prev) => [...prev, nt])
+            setActiveId(nt.id)
+            setViewMode('read')
+            if (filePath && api) {
+              const parent = await api.parentDirectory(filePath)
+              setBrowseDir(parent)
+            }
+          } catch {
+            /* ignore */
+          }
+        }
+      }
+    },
+    [api]
+  )
+
+  const handleDragOver = React.useCallback((e: React.DragEvent): void => {
+    e.preventDefault()
+    e.stopPropagation()
+    setDragOver(true)
+  }, [])
+
+  const handleDragLeave = React.useCallback((e: React.DragEvent): void => {
+    e.preventDefault()
+    const target = e.currentTarget as HTMLElement | null
+    const related = e.relatedTarget as HTMLElement | null
+    if (target && related && target.contains(related)) return
+    setDragOver(false)
+  }, [])
+
+  const exportHtml = React.useCallback((): void => {
+    if (!activeDoc.trim()) return
+    const html = `<!DOCTYPE html>
+<html lang="zh-CN">
+<head>
+<meta charset="UTF-8">
+<meta name="viewport" content="width=device-width, initial-scale=1.0">
+<title>${activeTab?.filePath ? tabLabel(activeTab) : '导出文档'}</title>
+<style>
+body { max-width: 860px; margin: 40px auto; padding: 0 20px; font-family: Georgia, 'Noto Serif SC', serif; font-size: 16px; line-height: 1.7; color: #333; }
+img { max-width: 100%; }
+pre { background: #f5f5f5; padding: 16px; border-radius: 6px; overflow-x: auto; }
+code { font-family: 'Consolas', monospace; font-size: 0.9em; }
+table { border-collapse: collapse; width: 100%; }
+th, td { border: 1px solid #ddd; padding: 8px 12px; text-align: left; }
+blockquote { border-left: 4px solid #ddd; margin: 0; padding: 0 16px; color: #666; }
+</style>
+</head>
+<body>
+${previewHtml}
+</body>
+</html>`
+    const blob = new Blob([html], { type: 'text/html;charset=utf-8' })
+    const url = URL.createObjectURL(blob)
+    const a = document.createElement('a')
+    a.href = url
+    a.download = `${activeTab?.filePath ? tabLabel(activeTab).replace(/\.\w+$/, '') : 'document'}.html`
+    document.body.appendChild(a)
+    a.click()
+    document.body.removeChild(a)
+    URL.revokeObjectURL(url)
+    setStatusText('已导出 HTML')
+    window.setTimeout(() => setStatusText(''), 2000)
+  }, [activeDoc, activeTab, previewHtml])
+
   const deleteFileAt = React.useCallback(
     async (filePath: string): Promise<void> => {
       if (!api) return
@@ -905,6 +1018,94 @@ export default function App(): React.ReactElement {
     void api.parentDirectory(activeTab.filePath).then(setBrowseDir)
   }, [activeId, activeTab?.filePath, api])
 
+  React.useEffect(() => {
+    const onKeyDown = (e: KeyboardEvent): void => {
+      if ((e.ctrlKey || e.metaKey) && e.key === 'f') {
+        e.preventDefault()
+        setSearchVisible((v) => !v)
+      }
+      if ((e.ctrlKey || e.metaKey) && e.key === 's') {
+        e.preventDefault()
+        void saveActive()
+      }
+      if ((e.ctrlKey || e.metaKey) && e.key === 'n') {
+        e.preventDefault()
+        newTabAction()
+      }
+      if ((e.ctrlKey || e.metaKey) && e.key === 'w') {
+        e.preventDefault()
+        requestCloseTab(activeId)
+      }
+      if ((e.ctrlKey || e.metaKey) && e.key === 'e') {
+        e.preventDefault()
+        cycleViewMode()
+      }
+      if ((e.ctrlKey || e.metaKey) && e.key === 'b') {
+        e.preventDefault()
+        setSidebarHidden((v) => !v)
+      }
+      if ((e.ctrlKey || e.metaKey) && e.key === 'o') {
+        e.preventDefault()
+        void openFileDialog()
+      }
+      if ((e.ctrlKey || e.metaKey) && e.shiftKey && e.key === 's') {
+        e.preventDefault()
+        void saveActiveAs()
+      }
+      if ((e.ctrlKey || e.metaKey) && e.shiftKey && e.key === 'e') {
+        e.preventDefault()
+        exportHtml()
+      }
+      if ((e.ctrlKey || e.metaKey) && e.shiftKey && e.key === 'f') {
+        e.preventDefault()
+        setAutoSave((v) => !v)
+      }
+      if ((e.ctrlKey || e.metaKey) && e.key === 'Tab') {
+        e.preventDefault()
+        const idx = tabs.findIndex((t) => t.id === activeId)
+        if (e.shiftKey) {
+          const prev = idx <= 0 ? tabs.length - 1 : idx - 1
+          setActiveId(tabs[prev]?.id ?? activeId)
+        } else {
+          const next = idx >= tabs.length - 1 ? 0 : idx + 1
+          setActiveId(tabs[next]?.id ?? activeId)
+        }
+      }
+      if ((e.ctrlKey || e.metaKey) && /^[1-9]$/.test(e.key)) {
+        e.preventDefault()
+        const num = Number.parseInt(e.key, 10)
+        const target = tabs[num - 1]
+        if (target) setActiveId(target.id)
+      }
+      if ((e.ctrlKey || e.metaKey) && e.shiftKey && e.key === 'o') {
+        e.preventDefault()
+        void openFolderDialog()
+      }
+      if ((e.ctrlKey || e.metaKey) && e.shiftKey && e.key === 'r') {
+        e.preventDefault()
+        void refreshDir()
+      }
+      if ((e.ctrlKey || e.metaKey) && e.shiftKey && e.key === '1') {
+        e.preventDefault()
+        setSidebarTab('files')
+      }
+      if ((e.ctrlKey || e.metaKey) && e.shiftKey && e.key === '2') {
+        e.preventDefault()
+        setSidebarTab('history')
+      }
+      if ((e.ctrlKey || e.metaKey) && e.shiftKey && e.key === '3') {
+        e.preventDefault()
+        setSidebarTab('outline')
+      }
+      if (e.key === 'Escape' && searchVisible) {
+        setSearchVisible(false)
+        setSearchQuery('')
+      }
+    }
+    window.addEventListener('keydown', onKeyDown)
+    return () => window.removeEventListener('keydown', onKeyDown)
+  }, [searchVisible, saveActive, newTabAction, activeId, requestCloseTab, cycleViewMode, openFileDialog, saveActiveAs, exportHtml, openFolderDialog, refreshDir])
+
   if (!api) {
     return (
       <div className="app-root">
@@ -1194,7 +1395,10 @@ export default function App(): React.ReactElement {
       {histCtxMenu ? (
         <div
           className="ctx-menu"
-          style={{ left: histCtxMenu.x, top: histCtxMenu.y }}
+          style={{
+            left: Math.min(histCtxMenu.x, window.innerWidth - 140),
+            top: Math.min(histCtxMenu.y, window.innerHeight - 100)
+          }}
           onMouseDown={(e) => e.stopPropagation()}
         >
           <button
@@ -1213,7 +1417,10 @@ export default function App(): React.ReactElement {
       {ctxMenu ? (
         <div
           className="ctx-menu"
-          style={{ left: ctxMenu.x, top: ctxMenu.y }}
+          style={{
+            left: Math.min(ctxMenu.x, window.innerWidth - 140),
+            top: Math.min(ctxMenu.y, window.innerHeight - 100)
+          }}
           onMouseDown={(e) => e.stopPropagation()}
         >
           <button
@@ -1236,31 +1443,23 @@ export default function App(): React.ReactElement {
       ) : null}
 
       <header className="tab-bar">
-        {tabs.map((t) => (
-          <div key={t.id} className={`tab ${t.id === activeId ? 'active' : ''}`}>
-            <button type="button" className="tab-main" onClick={() => setActiveId(t.id)}>
-              <span className="tab-title">{tabLabel(t)}</span>
-              {isDirty(t) ? <span className="dot">•</span> : null}
-            </button>
-            <button
-              type="button"
-              className="tab-close"
-              aria-label="关闭标签"
-              onClick={(e) => {
-                e.stopPropagation()
-                requestCloseTab(t.id)
-              }}
-            >
-              ×
-            </button>
-          </div>
-        ))}
+        <TabBar
+          tabs={tabs}
+          activeId={activeId}
+          onSelect={setActiveId}
+          onClose={requestCloseTab}
+          onCloseOthers={closeOtherTabs}
+          onCloseAll={closeAllTabs}
+        />
       </header>
 
       <div className="toolbar">
         <button type="button" onClick={() => void openFileDialog()}>
           打开
         </button>
+        <button type="button" onClick={() => void openFolderDialog()}>
+          打开文件夹
+        </button>
         <button type="button" onClick={() => void saveActive()}>
           保存
         </button>
@@ -1276,6 +1475,25 @@ export default function App(): React.ReactElement {
         <button type="button" onClick={() => setSidebarHidden((v) => !v)}>
           {sidebarHidden ? '显示侧栏' : '隐藏侧栏'}
         </button>
+        <button type="button" onClick={() => setStatsHidden((v) => !v)}>
+          {statsHidden ? '显示统计' : '隐藏统计'}
+        </button>
+        <button
+          type="button"
+          onClick={exportHtml}
+          disabled={!activeDoc.trim()}
+          title="导出当前文档为 HTML 文件"
+        >
+          导出 HTML
+        </button>
+        <button
+          type="button"
+          onClick={() => setAutoSave((v) => !v)}
+          title={autoSave ? '自动保存已开启（3秒无操作后保存）' : '自动保存已关闭'}
+          style={autoSave ? { borderColor: 'var(--accent)', color: 'var(--accent)' } : undefined}
+        >
+          {autoSave ? '自动保存：开' : '自动保存：关'}
+        </button>
         <div className="toolbar-tail">
           <label className="bg-select">
             行距
@@ -1325,111 +1543,30 @@ export default function App(): React.ReactElement {
         {!sidebarHidden ? (
           <>
             <aside className="sidebar" style={{ width: sidebarWidth, minWidth: sidebarWidth }}>
-              <div className="sidebar-tabs">
-                <button
-                  type="button"
-                  className={sidebarTab === 'files' ? 'on' : ''}
-                  onClick={() => setSidebarTab('files')}
-                >
-                  文件
-                </button>
-                <button
-                  type="button"
-                  className={sidebarTab === 'history' ? 'on' : ''}
-                  onClick={() => setSidebarTab('history')}
-                >
-                  历史
-                </button>
-                <button
-                  type="button"
-                  className={sidebarTab === 'outline' ? 'on' : ''}
-                  onClick={() => setSidebarTab('outline')}
-                >
-                  大纲
-                </button>
-              </div>
-              {sidebarTab === 'files' ? (
-                <div className="file-pane">
-                  <div className="path-row" title={browseDir}>
-                    <div className="path-row-actions">
-                      <button type="button" disabled={parentDisabled} onClick={() => void goParent()}>
-                        上级
-                      </button>
-                      <button type="button" onClick={() => void openFolderDialog()}>
-                        打开文件夹
-                      </button>
-                    </div>
-                    <span className="path">{browseDir || '…'}</span>
-                  </div>
-                  {dirError ? <div className="dir-error">{dirError}</div> : null}
-                  <ul className="dir-list">
-                    {dirEntries.map((e) => (
-                      <li key={e.path}>
-                        <button
-                          type="button"
-                          className="dir-item"
-                          data-kind={e.kind}
-                          onClick={() => {
-                            if (e.kind === 'dir') {
-                              setBrowseDir(e.path)
-                            } else {
-                              void openPathInTab(e.path)
-                            }
+              <Sidebar
+                sidebarTab={sidebarTab}
+                onSidebarTabChange={setSidebarTab}
+                browseDir={browseDir}
+                dirEntries={dirEntries}
+                dirError={dirError}
+                parentDisabled={parentDisabled}
+                onNavigateDir={setBrowseDir}
+                onOpenFile={(path) => void openPathInTab(path)}
+                onContextMenu={(e, path, kind) => {
+                  e.preventDefault()
+                  setCtxMenu({ x: e.clientX, y: e.clientY, path, kind })
                 }}
-                          onContextMenu={(ev) => {
-                            ev.preventDefault()
-                            setCtxMenu({
-                              x: ev.clientX,
-                              y: ev.clientY,
-                              path: e.path,
-                              kind: e.kind
-                            })
+                fileHistory={fileHistory}
+                onHistoryOpen={(path) => void openPathInTab(path)}
+                onHistoryContextMenu={(e, path) => {
+                  e.preventDefault()
+                  setHistCtxMenu({ x: e.clientX, y: e.clientY, path })
                 }}
-                        >
-                          <span
-                            className={
-                              e.kind === 'dir' ? 'entry-kind entry-kind--dir' : 'entry-kind entry-kind--file'
-                            }
-                          >
-                            {e.kind === 'dir' ? '夹' : '文'}
-                          </span>
-                          <span className="entry-name">{e.name}</span>
-                        </button>
-                      </li>
-                    ))}
-                  </ul>
-                </div>
-              ) : sidebarTab === 'history' ? (
-                <div className="file-pane history-pane">
-                  {fileHistory.length === 0 ? (
-                    <p className="outline-empty">暂无打开记录</p>
-                  ) : (
-                    <ul className="history-list">
-                      {fileHistory.map((path) => (
-                        <li key={path}>
-                          <button
-                            type="button"
-                            className="history-item"
-                            title={path}
-                            onClick={() => void openPathInTab(path)}
-                            onContextMenu={(ev) => {
-                              ev.preventDefault()
-                              setHistCtxMenu({ x: ev.clientX, y: ev.clientY, path })
-                            }}
-                          >
-                            <span className="history-item-name">{historyFileName(path)}</span>
-                            <span className="history-item-path">{path}</span>
-                          </button>
-                        </li>
-                      ))}
-                    </ul>
-                  )}
-                </div>
-              ) : (
-                <div className="file-pane outline-pane">
-                  <OutlinePanel items={outline} onSelect={navigateToOutline} />
-                </div>
-              )}
+                outlineItems={outline}
+                onOutlineSelect={navigateToOutline}
+                tabs={tabs}
+                activeId={activeId}
+              />
             </aside>
             <div
               className="sidebar-resize"
@@ -1448,7 +1585,125 @@ export default function App(): React.ReactElement {
           </button>
         )}
 
-        <section className="content">
+        {searchVisible ? (
+          <div className="search-bar">
+            <input
+              type="text"
+              className="search-input"
+              placeholder="搜索文档内容…（Enter 查找下一个，Esc 关闭）"
+              value={searchQuery}
+              onChange={(e) => setSearchQuery(e.target.value)}
+              onKeyDown={(e) => {
+                if (e.key === 'Escape') {
+                  setSearchVisible(false)
+                  setSearchQuery('')
+                }
+                if (e.key === 'Enter') {
+                  e.preventDefault()
+                  if (!searchQuery.trim()) return
+                  if (viewMode === 'read') {
+                    const article = readPreviewArticleRef.current
+                    if (article) {
+                      const text = article.textContent || ''
+                      const idx = text.toLowerCase().indexOf(searchQuery.toLowerCase())
+                      if (idx >= 0) {
+                        const range = document.createRange()
+                        const walker = document.createTreeWalker(article, NodeFilter.SHOW_TEXT)
+                        let currentIdx = 0
+                        let node: Text | null = null
+                        while ((node = walker.nextNode() as Text | null)) {
+                          const len = node.textContent?.length || 0
+                          if (currentIdx + len > idx) {
+                            range.setStart(node, idx - currentIdx)
+                            range.setEnd(node, idx - currentIdx + searchQuery.length)
+                            range.startContainer.parentElement?.scrollIntoView({ behavior: 'smooth', block: 'center' })
+                            break
+                          }
+                          currentIdx += len
+                        }
+                      }
+                    }
+                    return
+                  }
+                  if (viewMode === 'edit') {
+                    editorRef.current?.searchText(searchQuery)
+                    return
+                  }
+                  const view = hybridEditorViewRef.current
+                  if (view) {
+                    const doc = view.state.doc.toString()
+                    const idx = doc.toLowerCase().indexOf(searchQuery.toLowerCase())
+                    if (idx >= 0) {
+                      view.dispatch({
+                        selection: { anchor: idx, head: idx + searchQuery.length },
+                        scrollIntoView: true
+                      })
+                    }
+                  }
+                }
+              }}
+              autoFocus
+            />
+            <button
+              type="button"
+              className="search-next-btn"
+              title="查找下一个"
+              onClick={() => {
+                if (!searchQuery.trim()) return
+                if (viewMode === 'read') {
+                  const article = readPreviewArticleRef.current
+                  if (article) {
+                    const text = article.textContent || ''
+                    const idx = text.toLowerCase().indexOf(searchQuery.toLowerCase())
+                    if (idx >= 0) {
+                      const walker = document.createTreeWalker(article, NodeFilter.SHOW_TEXT)
+                      let currentIdx = 0
+                      let node: Text | null = null
+                      while ((node = walker.nextNode() as Text | null)) {
+                        const len = node.textContent?.length || 0
+                        if (currentIdx + len > idx) {
+                          node.parentElement?.scrollIntoView({ behavior: 'smooth', block: 'center' })
+                          break
+                        }
+                        currentIdx += len
+                      }
+                    }
+                  }
+                  return
+                }
+                if (viewMode === 'edit') {
+                  editorRef.current?.searchText(searchQuery)
+                  return
+                }
+                const view = hybridEditorViewRef.current
+                if (view) {
+                  const doc = view.state.doc.toString()
+                  const idx = doc.toLowerCase().indexOf(searchQuery.toLowerCase())
+                  if (idx >= 0) {
+                    view.dispatch({
+                      selection: { anchor: idx, head: idx + searchQuery.length },
+                      scrollIntoView: true
+                    })
+                  }
+                }
+              }}
+            >
+              ↓
+            </button>
+            <button
+              type="button"
+              className="search-close-btn"
+              onClick={() => {
+                setSearchVisible(false)
+                setSearchQuery('')
+              }}
+            >
+              ✕
+            </button>
+          </div>
+        ) : null}
+
+        <section className={`content${dragOver ? ' content-drag-over' : ''}`} onDrop={handleDrop} onDragOver={handleDragOver} onDragLeave={handleDragLeave}>
           {(viewMode === 'edit' || viewMode === 'hybrid') && activeTab ? (
             <MarkdownFormatToolbar editorRef={editorRef} />
           ) : null}
@@ -1466,7 +1721,13 @@ export default function App(): React.ReactElement {
               </div>
             ) : (
               <div className="content-empty">
-                请从侧栏选择文件、使用工具栏「打开」，或点击「新标签」开始编辑。
+                <div className="content-empty-icon">📖</div>
+                <div>请从侧栏选择文件、使用工具栏「打开」，或点击「新标签」开始编辑。</div>
+                <div className="content-empty-hint">支持拖放 .md 文件到此处打开 · Ctrl+F 搜索 · Ctrl+S 保存</div>
+                <div className="content-drop-zone">
+                  <span className="content-drop-zone-icon">📂</span>
+                  <span>拖放 Markdown 文件到此处打开</span>
+                </div>
               </div>
             )
           ) : null}
@@ -1486,7 +1747,13 @@ export default function App(): React.ReactElement {
               />
             ) : (
               <div className="content-empty">
-                请从侧栏选择文件、使用工具栏「打开」，或点击「新标签」开始编辑。
+                <div className="content-empty-icon">✏️</div>
+                <div>请从侧栏选择文件、使用工具栏「打开」，或点击「新标签」开始编辑。</div>
+                <div className="content-empty-hint">支持拖放 .md 文件到此处打开 · Ctrl+F 搜索 · Ctrl+S 保存</div>
+                <div className="content-drop-zone">
+                  <span className="content-drop-zone-icon">📂</span>
+                  <span>拖放 Markdown 文件到此处打开</span>
+                </div>
               </div>
             )
           ) : null}
@@ -1534,12 +1801,36 @@ export default function App(): React.ReactElement {
               </div>
             ) : (
               <div className="content-empty">
-                请从侧栏选择文件、使用工具栏「打开」，或点击「新标签」开始编辑。
+                <div className="content-empty-icon">📝</div>
+                <div>请从侧栏选择文件、使用工具栏「打开」，或点击「新标签」开始编辑。</div>
+                <div className="content-empty-hint">支持拖放 .md 文件到此处打开 · Ctrl+F 搜索 · Ctrl+S 保存</div>
+                <div className="content-drop-zone">
+                  <span className="content-drop-zone-icon">📂</span>
+                  <span>拖放 Markdown 文件到此处打开</span>
+                </div>
               </div>
             )
           ) : null}
         </section>
+
+        {activeTab && !statsHidden ? (
+          <StatsPanel
+            doc={activeDoc}
+            width={statsWidth}
+            onResizeStart={startStatsResize}
+          />
+        ) : null}
+
+        {statusText ? <div className="status-bar">{statusText}</div> : null}
       </div>
+      {dragOver ? (
+        <div className="global-drop-overlay">
+          <div className="global-drop-overlay-box">
+            <span className="global-drop-overlay-icon">📂</span>
+            <span className="global-drop-overlay-text">释放以打开 Markdown 文件</span>
+          </div>
+        </div>
+      ) : null}
     </div>
   )
 }

src/renderer/src/EditorPane.tsx

@@ -13,6 +13,8 @@ import {
 
 export type MarkdownEditorHandle = {
   applyAction: (id: string) => void | Promise<void>
+  searchText: (query: string) => boolean
+  getView: () => EditorView | null
 }
 
 type Props = {
@@ -286,7 +288,22 @@ export const EditorPane = React.forwardRef<MarkdownEditorHandle, Props>(
             requestImageDetails: requestImageDetailsRef.current,
             requestColor: requestColorRef.current
           })
+        },
+        searchText: (query: string): boolean => {
+          const view = viewRef.current
+          if (!view || !query.trim()) return false
+          const doc = view.state.doc.toString()
+          const idx = doc.toLowerCase().indexOf(query.toLowerCase())
+          if (idx >= 0) {
+            view.dispatch({
+              selection: { anchor: idx, head: idx + query.length },
+              scrollIntoView: true
+            })
+            return true
           }
+          return false
+        },
+        getView: (): EditorView | null => viewRef.current
       }),
       []
     )
@@ -347,9 +364,10 @@ export const EditorPane = React.forwardRef<MarkdownEditorHandle, Props>(
       if (!view) return
       const cur = view.state.doc.toString()
       if (cur !== value) {
+        const main = view.state.selection.main
         view.dispatch({
           changes: { from: 0, to: cur.length, insert: value },
-          selection: { anchor: 0 },
+          selection: main.empty ? { anchor: main.from } : { anchor: main.from, head: main.to },
           scrollIntoView: true
         })
       }

src/renderer/src/MarkdownFormatToolbar.tsx

@@ -1,34 +1,59 @@
 import * as React from 'react'
 import type { MarkdownEditorHandle } from './EditorPane'
 
-const BUTTONS: { id: string; label: string }[] = [
+const GROUPS: { label: string; buttons: { id: string; label: string }[] }[] = [
+  {
+    label: '标题',
+    buttons: [
       { id: 'h1', label: 'H1' },
       { id: 'h2', label: 'H2' },
       { id: 'h3', label: 'H3' },
       { id: 'h4', label: 'H4' },
       { id: 'h5', label: 'H5' },
-  { id: 'h6', label: 'H6' },
-  { id: 'bold', label: '加粗' },
-  { id: 'italic', label: '斜体' },
-  { id: 'strike', label: '删除线' },
-  { id: 'code', label: '行内代码' },
-  { id: 'codeBlock', label: '代码块' },
+      { id: 'h6', label: 'H6' }
+    ]
+  },
+  {
+    label: '格式',
+    buttons: [
+      { id: 'bold', label: 'B' },
+      { id: 'italic', label: 'I' },
+      { id: 'strike', label: 'S' },
+      { id: 'code', label: '`' },
+      { id: 'mark', label: '高亮' },
+      { id: 'color', label: '颜色' }
+    ]
+  },
+  {
+    label: '元素',
+    buttons: [
       { id: 'link', label: '链接' },
       { id: 'image', label: '图片' },
-  { id: 'ul', label: '无序列表' },
-  { id: 'ol', label: '有序列表' },
-  { id: 'task', label: '任务' },
-  { id: 'quote', label: '引用' },
-  { id: 'hr', label: '分隔线' },
+      { id: 'codeBlock', label: '代码块' },
       { id: 'table', label: '表格' },
-  { id: 'mark', label: '高亮' },
-  { id: 'color', label: '颜色' },
+      { id: 'hr', label: '分隔线' },
+      { id: 'quote', label: '引用' }
+    ]
+  },
+  {
+    label: '列表',
+    buttons: [
+      { id: 'ul', label: '无序' },
+      { id: 'ol', label: '有序' },
+      { id: 'task', label: '任务' }
+    ]
+  },
+  {
+    label: '其他',
+    buttons: [
       { id: 'sup', label: '上标' },
       { id: 'sub', label: '下标' },
       { id: 'kbd', label: '按键' },
       { id: 'details', label: '折叠' },
       { id: 'footnote', label: '脚注' }
     ]
+  }
+]
 
 type Props = {
   editorRef: React.RefObject<MarkdownEditorHandle | null>
@@ -38,7 +63,11 @@ export function MarkdownFormatToolbar({ editorRef }: Props): React.ReactElement
   return (
     <div className="md-format-wrap">
       <div className="md-format-bar">
-        {BUTTONS.map((b) => (
+        {GROUPS.map((group) => (
+          <div key={group.label} className="md-format-group">
+            <span className="md-format-group-label">{group.label}</span>
+            <div className="md-format-group-btns">
+              {group.buttons.map((b) => (
                 <button
                   key={b.id}
                   type="button"
@@ -50,5 +79,8 @@ export function MarkdownFormatToolbar({ editorRef }: Props): React.ReactElement
               ))}
             </div>
           </div>
+        ))}
+      </div>
+    </div>
   )
 }

src/renderer/src/OutlinePanel.tsx

@@ -74,7 +74,18 @@ export function OutlinePanel({ items, onSelect }: Props): React.ReactElement {
   }
 
   if (items.length === 0) {
-    return <p className="outline-empty">当前文档没有标题</p>
+    return (
+      <div className="outline-panel-wrap">
+        <div className="outline-toolbar">
+          <span className="outline-toolbar-title">大纲</span>
+        </div>
+        <div className="sidebar-empty">
+          <span className="sidebar-empty-icon">📑</span>
+          <span className="sidebar-empty-text">当前文档没有标题</span>
+          <span className="sidebar-empty-hint">在文档中使用 # 标题语法即可在此显示</span>
+        </div>
+      </div>
+    )
   }
 
   const collapsedCount = collapsed.size

src/renderer/src/Sidebar.tsx

@@ -0,0 +1,228 @@
+import * as React from 'react'
+import type { Tab } from './types'
+import { OutlinePanel } from './OutlinePanel'
+import type { OutlineItem } from './markdown'
+
+type DirEntry = { name: string; path: string; kind: 'file' | 'dir' }
+
+type Props = {
+  sidebarTab: 'files' | 'history' | 'outline'
+  onSidebarTabChange: (tab: 'files' | 'history' | 'outline') => void
+  browseDir: string
+  dirEntries: DirEntry[]
+  dirError: string | null
+  parentDisabled: boolean
+  onNavigateDir: (path: string) => void
+  onOpenFile: (path: string) => void
+  onContextMenu: (e: React.MouseEvent, path: string, kind: 'file' | 'dir') => void
+  fileHistory: string[]
+  onHistoryOpen: (path: string) => void
+  onHistoryContextMenu: (e: React.MouseEvent, path: string) => void
+  outlineItems: OutlineItem[]
+  onOutlineSelect: (item: OutlineItem) => void
+  tabs: Tab[]
+  activeId: string
+}
+
+export function Sidebar({
+  sidebarTab,
+  onSidebarTabChange,
+  browseDir,
+  dirEntries,
+  dirError,
+  parentDisabled,
+  onNavigateDir,
+  onOpenFile,
+  onContextMenu,
+  fileHistory,
+  onHistoryOpen,
+  onHistoryContextMenu,
+  outlineItems,
+  onOutlineSelect,
+  tabs,
+  activeId
+}: Props): React.ReactElement {
+  const [filter, setFilter] = React.useState('')
+
+  const filteredEntries = React.useMemo(() => {
+    if (!filter) return dirEntries
+    const lower = filter.toLowerCase()
+    return dirEntries.filter((e) => e.name.toLowerCase().includes(lower))
+  }, [dirEntries, filter])
+
+  const activeFilePath = React.useMemo(() => {
+    const t = tabs.find((x) => x.id === activeId)
+    return t?.filePath ?? null
+  }, [tabs, activeId])
+
+  return (
+    <div className="sidebar-content">
+      <div className="sidebar-tabs">
+        <button
+          type="button"
+          className={sidebarTab === 'files' ? 'on' : ''}
+          onClick={() => onSidebarTabChange('files')}
+        >
+          文件
+        </button>
+        <button
+          type="button"
+          className={sidebarTab === 'history' ? 'on' : ''}
+          onClick={() => onSidebarTabChange('history')}
+        >
+          历史
+        </button>
+        <button
+          type="button"
+          className={sidebarTab === 'outline' ? 'on' : ''}
+          onClick={() => onSidebarTabChange('outline')}
+        >
+          大纲
+        </button>
+      </div>
+
+      {sidebarTab === 'files' ? (
+        <FilePanel
+          browseDir={browseDir}
+          dirEntries={filteredEntries}
+          dirError={dirError}
+          parentDisabled={parentDisabled}
+          onNavigateDir={onNavigateDir}
+          onOpenFile={onOpenFile}
+          onContextMenu={onContextMenu}
+          filter={filter}
+          onFilterChange={setFilter}
+          activeFilePath={activeFilePath}
+        />
+      ) : sidebarTab === 'history' ? (
+        <HistoryPanel
+          fileHistory={fileHistory}
+          onOpen={onHistoryOpen}
+          onContextMenu={onHistoryContextMenu}
+        />
+      ) : (
+        <OutlinePanel items={outlineItems} onSelect={onOutlineSelect} />
+      )}
+    </div>
+  )
+}
+
+function FilePanel({
+  browseDir,
+  dirEntries,
+  dirError,
+  parentDisabled,
+  onNavigateDir,
+  onOpenFile,
+  onContextMenu,
+  filter,
+  onFilterChange,
+  activeFilePath
+}: {
+  browseDir: string
+  dirEntries: DirEntry[]
+  dirError: string | null
+  parentDisabled: boolean
+  onNavigateDir: (path: string) => void
+  onOpenFile: (path: string) => void
+  onContextMenu: (e: React.MouseEvent, path: string, kind: 'file' | 'dir') => void
+  filter: string
+  onFilterChange: (v: string) => void
+  activeFilePath: string | null
+}): React.ReactElement {
+  return (
+    <div className="file-panel">
+      <div className="path-row">
+        <button
+          type="button"
+          className="path-btn"
+          disabled={parentDisabled}
+          onClick={() => {
+            const parts = browseDir.replace(/\\/g, '/').replace(/\/+$/, '').split('/')
+            parts.pop()
+            onNavigateDir(parts.join('/') || '/')
+          }}
+          title="上级目录"
+        >
+          ←
+        </button>
+        <span className="path-label" title={browseDir}>{browseDir}</span>
+      </div>
+      <div className="file-filter">
+        <input
+          type="text"
+          className="file-filter-input"
+          placeholder="筛选文件..."
+          value={filter}
+          onChange={(e) => onFilterChange(e.target.value)}
+        />
+      </div>
+      <div className="dir-list">
+        {dirError ? (
+          <div className="sidebar-empty">
+            <div className="sidebar-empty-icon">⚠️</div>
+            <div className="sidebar-empty-text">{dirError}</div>
+          </div>
+        ) : dirEntries.length === 0 ? (
+          <div className="sidebar-empty">
+            <div className="sidebar-empty-icon">📂</div>
+            <div className="sidebar-empty-text">此目录为空</div>
+            <div className="sidebar-empty-hint">拖放 Markdown 文件到窗口打开</div>
+          </div>
+        ) : (
+          dirEntries.map((e) => (
+            <div
+              key={e.path}
+              className={`dir-item${e.kind === 'file' && e.path === activeFilePath ? ' dir-item--active' : ''}`}
+              onClick={() => {
+                if (e.kind === 'dir') onNavigateDir(e.path)
+                else onOpenFile(e.path)
+              }}
+              onContextMenu={(ev) => onContextMenu(ev, e.path, e.kind)}
+            >
+              <span className="dir-item-icon">{e.kind === 'dir' ? '📁' : '📄'}</span>
+              <span className="dir-item-name">{e.name}</span>
+            </div>
+          ))
+        )}
+      </div>
+    </div>
+  )
+}
+
+function HistoryPanel({
+  fileHistory,
+  onOpen,
+  onContextMenu
+}: {
+  fileHistory: string[]
+  onOpen: (path: string) => void
+  onContextMenu: (e: React.MouseEvent, path: string) => void
+}): React.ReactElement {
+  return (
+    <div className="history-panel">
+      {fileHistory.length === 0 ? (
+        <div className="sidebar-empty">
+          <div className="sidebar-empty-icon">🕐</div>
+          <div className="sidebar-empty-text">暂无历史记录</div>
+          <div className="sidebar-empty-hint">打开文件后会自动记录</div>
+        </div>
+      ) : (
+        fileHistory.map((p) => (
+          <div
+            key={p}
+            className="history-item"
+            onClick={() => onOpen(p)}
+            onContextMenu={(ev) => onContextMenu(ev, p)}
+          >
+            <span className="history-item-icon">📄</span>
+            <div className="history-item-body">
+              <span className="history-item-name">{p.split(/[/\\]/).pop()}</span>
+              <span className="history-item-path">{p}</span>
+            </div>
+          </div>
+        ))
+      )}
+    </div>
+  )
+}

src/renderer/src/StatsPanel.tsx

@@ -0,0 +1,183 @@
+import * as React from 'react'
+
+type Props = {
+  doc: string
+  width: number
+  onResizeStart: (e: React.MouseEvent) => void
+}
+
+function wordCount(s: string): number {
+  return s.replace(/[\u4e00-\u9fff]/g, ' $& ').split(/[\s]+/).filter(Boolean).length
+}
+
+function codeBlockCount(s: string): number {
+  return Math.floor(((s.match(/```/g) || []).length) / 2)
+}
+
+function imageCount(s: string): number {
+  return (s.match(/!\[.*?\]\(.*?\)/g) || []).length
+}
+
+function linkCount(s: string): number {
+  return (s.match(/\[.*?\]\(.*?\)/g) || []).length
+}
+
+function tableCount(s: string): number {
+  return (s.match(/^\|.+\|.+\|/gm) || []).length
+}
+
+function blockquoteCount(s: string): number {
+  return (s.match(/^>\s/gm) || []).length
+}
+
+function listItemCount(s: string): number {
+  return (s.match(/^(?:[-*+]|\d+\.)\s/gm) || []).length
+}
+
+function mermaidCount(s: string): number {
+  return (s.match(/```mermaid\n?/gi) || []).length
+}
+
+function headingCount(s: string): number {
+  return (s.match(/^#{1,6}\s/gm) || []).length
+}
+
+function boldCount(s: string): number {
+  return (s.match(/\*\*[^*]+\*\*/g) || []).length
+}
+
+function italicCount(s: string): number {
+  return (s.match(/(?<!\*)\*[^*\n]+\*(?!\*)/g) || []).length
+}
+
+function inlineCodeCount(s: string): number {
+  return (s.match(/`[^`\n]+`/g) || []).length
+}
+
+function taskCount(s: string): { done: number; total: number } {
+  const tasks = s.match(/^\s*[-*+]\s+\[([ x])\]/gm) || []
+  const done = tasks.filter((t) => t.includes('[x]')).length
+  return { done, total: tasks.length }
+}
+
+function docSize(s: string): string {
+  const sizeKB = new Blob([s]).size / 1024
+  return sizeKB < 1 ? '<1 KB' : `${Math.round(sizeKB)} KB`
+}
+
+export function StatsPanel({ doc, width, onResizeStart }: Props): React.ReactElement {
+  return (
+    <>
+      <div className="stats-resize" onMouseDown={onResizeStart} title="拖动调整统计栏宽度" />
+      <aside className="stats-panel" style={{ width, minWidth: width }}>
+        <div className="stats-panel-header">
+          <span className="stats-panel-header-icon">📊</span>
+          文档统计
+        </div>
+        <div className="stats-panel-body">
+          <div className="stats-panel-section">
+            <div className="stats-panel-section-title">字数</div>
+            <div className="stats-panel-grid">
+              <div className="stats-panel-item">
+                <span className="stats-panel-value">{doc.length.toLocaleString()}</span>
+                <span className="stats-panel-label">字符</span>
+              </div>
+              <div className="stats-panel-item">
+                <span className="stats-panel-value">{doc.replace(/\s/g, '').length.toLocaleString()}</span>
+                <span className="stats-panel-label">字（无空格）</span>
+              </div>
+              <div className="stats-panel-item">
+                <span className="stats-panel-value">{wordCount(doc).toLocaleString()}</span>
+                <span className="stats-panel-label">词</span>
+              </div>
+            </div>
+          </div>
+          <div className="stats-panel-section">
+            <div className="stats-panel-section-title">结构</div>
+            <div className="stats-panel-grid">
+              <div className="stats-panel-item">
+                <span className="stats-panel-value">{doc === '' ? 0 : doc.split('\n').length}</span>
+                <span className="stats-panel-label">行</span>
+              </div>
+              <div className="stats-panel-item">
+                <span className="stats-panel-value">{doc.split(/\n\s*\n/).filter((p) => p.trim().length > 0).length}</span>
+                <span className="stats-panel-label">段落</span>
+              </div>
+              <div className="stats-panel-item">
+                <span className="stats-panel-value">{Math.max(1, Math.round(wordCount(doc) / 300))}</span>
+                <span className="stats-panel-label">分钟阅读</span>
+              </div>
+            </div>
+          </div>
+          <div className="stats-panel-section">
+            <div className="stats-panel-section-title">元素</div>
+            <div className="stats-panel-grid">
+              <div className="stats-panel-item">
+                <span className="stats-panel-value">{codeBlockCount(doc)}</span>
+                <span className="stats-panel-label">代码块</span>
+              </div>
+              <div className="stats-panel-item">
+                <span className="stats-panel-value">{imageCount(doc)}</span>
+                <span className="stats-panel-label">图片</span>
+              </div>
+              <div className="stats-panel-item">
+                <span className="stats-panel-value">{linkCount(doc)}</span>
+                <span className="stats-panel-label">链接</span>
+              </div>
+              <div className="stats-panel-item">
+                <span className="stats-panel-value">{tableCount(doc)}</span>
+                <span className="stats-panel-label">表格</span>
+              </div>
+              <div className="stats-panel-item">
+                <span className="stats-panel-value">{blockquoteCount(doc)}</span>
+                <span className="stats-panel-label">引用</span>
+              </div>
+              <div className="stats-panel-item">
+                <span className="stats-panel-value">{listItemCount(doc)}</span>
+                <span className="stats-panel-label">列表项</span>
+              </div>
+            </div>
+          </div>
+          <div className="stats-panel-section">
+            <div className="stats-panel-section-title">图表</div>
+            <div className="stats-panel-grid">
+              <div className="stats-panel-item">
+                <span className="stats-panel-value">{mermaidCount(doc)}</span>
+                <span className="stats-panel-label">Mermaid</span>
+              </div>
+              <div className="stats-panel-item">
+                <span className="stats-panel-value">{docSize(doc)}</span>
+                <span className="stats-panel-label">文档大小</span>
+              </div>
+            </div>
+          </div>
+          <div className="stats-panel-section">
+            <div className="stats-panel-section-title">格式</div>
+            <div className="stats-panel-grid">
+              <div className="stats-panel-item">
+                <span className="stats-panel-value">{headingCount(doc)}</span>
+                <span className="stats-panel-label">标题</span>
+              </div>
+              <div className="stats-panel-item">
+                <span className="stats-panel-value">{boldCount(doc)}</span>
+                <span className="stats-panel-label">加粗</span>
+              </div>
+              <div className="stats-panel-item">
+                <span className="stats-panel-value">{italicCount(doc)}</span>
+                <span className="stats-panel-label">斜体</span>
+              </div>
+              <div className="stats-panel-item">
+                <span className="stats-panel-value">{inlineCodeCount(doc)}</span>
+                <span className="stats-panel-label">行内代码</span>
+              </div>
+              <div className="stats-panel-item">
+                <span className="stats-panel-value">{taskCount(doc).done}/{taskCount(doc).total}</span>
+                <span className="stats-panel-label">任务</span>
+              </div>
+            </div>
+          </div>
+        </div>
+      </aside>
+    </>
+  )
+}

src/renderer/src/TabBar.tsx

@@ -0,0 +1,115 @@
+import * as React from 'react'
+import type { Tab } from './types'
+import { tabLabel, isDirty } from './utils'
+
+type Props = {
+  tabs: Tab[]
+  activeId: string
+  onSelect: (id: string) => void
+  onClose: (id: string) => void
+  onCloseOthers: (id: string) => void
+  onCloseAll: () => void
+}
+
+export function TabBar({ tabs, activeId, onSelect, onClose, onCloseOthers, onCloseAll }: Props): React.ReactElement {
+  const barRef = React.useRef<HTMLDivElement>(null)
+
+  React.useEffect(() => {
+    const el = barRef.current
+    if (!el) return
+    const active = el.querySelector('.tab.active') as HTMLElement | null
+    if (active) {
+      active.scrollIntoView({ behavior: 'smooth', block: 'nearest', inline: 'nearest' })
+    }
+  }, [activeId])
+
+  return (
+    <div className="tab-bar" ref={barRef}>
+      {tabs.map((t) => (
+        <TabItem
+          key={t.id}
+          tab={t}
+          active={t.id === activeId}
+          onSelect={() => onSelect(t.id)}
+          onClose={() => onClose(t.id)}
+          onCloseOthers={() => onCloseOthers(t.id)}
+          onCloseAll={onCloseAll}
+        />
+      ))}
+    </div>
+  )
+}
+
+type TabItemProps = {
+  tab: Tab
+  active: boolean
+  onSelect: () => void
+  onClose: () => void
+  onCloseOthers: () => void
+  onCloseAll: () => void
+}
+
+function TabItem({ tab, active, onSelect, onClose, onCloseOthers, onCloseAll }: TabItemProps): React.ReactElement {
+  const [menuOpen, setMenuOpen] = React.useState(false)
+  const [menuPos, setMenuPos] = React.useState({ x: 0, y: 0 })
+  const menuRef = React.useRef<HTMLDivElement>(null)
+
+  React.useEffect(() => {
+    if (!menuOpen) return
+    const close = (e: MouseEvent): void => {
+      if (menuRef.current && !menuRef.current.contains(e.target as Node)) {
+        setMenuOpen(false)
+      }
+    }
+    const closeOnScroll = (): void => setMenuOpen(false)
+    document.addEventListener('mousedown', close)
+    window.addEventListener('scroll', closeOnScroll, true)
+    return () => {
+      document.removeEventListener('mousedown', close)
+      window.removeEventListener('scroll', closeOnScroll, true)
+    }
+  }, [menuOpen])
+
+  const handleContextMenu = (e: React.MouseEvent): void => {
+    e.preventDefault()
+    e.stopPropagation()
+    setMenuPos({
+      x: Math.min(e.clientX, window.innerWidth - 140),
+      y: Math.min(e.clientY, window.innerHeight - 140)
+    })
+    setMenuOpen(true)
+  }
+
+  return (
+    <div className={`tab${active ? ' active' : ''}`} onContextMenu={handleContextMenu}>
+      <button type="button" className="tab-main" onClick={onSelect} title={tab.filePath ?? undefined}>
+        {isDirty(tab) ? <span className="dot">·</span> : null}
+        <span className="tab-title">{tabLabel(tab)}</span>
+      </button>
+      <button
+        type="button"
+        className="tab-close"
+        onClick={(e) => {
+          e.stopPropagation()
+          onClose()
+        }}
+        title="关闭"
+      >
+        ✕
+      </button>
+      {menuOpen ? (
+        <div className="tab-context-menu" ref={menuRef} style={{ left: menuPos.x, top: menuPos.y }}>
+          <button type="button" onClick={() => { onClose(); setMenuOpen(false) }}>
+            关闭
+          </button>
+          <button type="button" onClick={() => { onCloseOthers(); setMenuOpen(false) }}>
+            关闭其他
+          </button>
+          <button type="button" onClick={() => { onCloseAll(); setMenuOpen(false) }}>
+            关闭全部
+          </button>
+        </div>
+      ) : null}
+    </div>
+  )
+}

src/renderer/src/appearance-styles.css

@@ -328,72 +328,72 @@
 :root[data-font='0'] {
   --font-ui: system-ui, -apple-system, 'Segoe UI', Roboto, sans-serif;
   --font-editor: ui-monospace, Menlo, Consolas, monospace;
-  --font-preview: Georgia, 'Times New Roman', 'Noto Serif SC', serif;
+  --font-preview: system-ui, -apple-system, 'Segoe UI', Roboto, sans-serif;
 }
 :root[data-font='1'] {
-  --font-ui: Georgia, 'Times New Roman', serif;
+  --font-ui: Georgia, 'Times New Roman', 'Noto Serif SC', serif;
   --font-editor: Consolas, 'Courier New', monospace;
-  --font-preview: 'Palatino Linotype', Palatino, 'Noto Serif SC', serif;
+  --font-preview: 'Palatino Linotype', Palatino, 'Noto Serif SC', 'Songti SC', serif;
 }
 :root[data-font='2'] {
   --font-ui: system-ui, sans-serif;
-  --font-editor: 'JetBrains Mono', 'Fira Code', Consolas, monospace;
-  --font-preview: 'Source Serif 4', Cambria, Georgia, serif;
+  --font-editor: 'JetBrains Mono', 'Fira Code', 'Cascadia Code', Consolas, monospace;
+  --font-preview: 'JetBrains Mono', 'Fira Code', Consolas, monospace;
 }
 :root[data-font='3'] {
   --font-ui: 'Microsoft YaHei', 'PingFang SC', sans-serif;
   --font-editor: 'Sarasa Mono SC', Consolas, monospace;
-  --font-preview: 'Songti SC', SimSun, 'Noto Serif SC', serif;
+  --font-preview: 'Songti SC', 'SimSun', 'Noto Serif SC', 'STSong', serif;
 }
 :root[data-font='4'] {
   --font-ui: 'IBM Plex Sans', system-ui, sans-serif;
   --font-editor: 'IBM Plex Mono', Consolas, monospace;
-  --font-preview: 'IBM Plex Serif', Georgia, serif;
+  --font-preview: 'IBM Plex Serif', Georgia, 'Noto Serif SC', serif;
 }
 :root[data-font='5'] {
   --font-ui: 'Helvetica Neue', Helvetica, Arial, sans-serif;
   --font-editor: Menlo, Monaco, Consolas, monospace;
-  --font-preview: 'Helvetica Neue', Arial, sans-serif;
+  --font-preview: 'Helvetica Neue', Helvetica, Arial, 'PingFang SC', sans-serif;
 }
 :root[data-font='6'] {
-  --font-ui: Verdana, Geneva, sans-serif;
-  --font-editor: 'Lucida Console', monospace;
-  --font-preview: Georgia, Cambria, serif;
+  --font-ui: Georgia, 'Times New Roman', serif;
+  --font-editor: 'Lucida Console', 'Courier New', monospace;
+  --font-preview: Georgia, Cambria, 'Times New Roman', 'Noto Serif SC', serif;
 }
 :root[data-font='7'] {
-  --font-ui: 'Trebuchet MS', sans-serif;
-  --font-editor: 'Courier New', Courier, monospace;
-  --font-preview: 'Book Antiqua', Palatino, serif;
+  --font-ui: Verdana, Geneva, Tahoma, sans-serif;
+  --font-editor: 'Lucida Console', 'Courier New', monospace;
+  --font-preview: Verdana, Geneva, 'Microsoft YaHei', sans-serif;
 }
 :root[data-font='8'] {
-  --font-ui: 'Segoe UI', system-ui, sans-serif;
-  --font-editor: 'Cascadia Code', 'Cascadia Mono', Consolas, monospace;
-  --font-preview: Constantia, 'Times New Roman', serif;
+  --font-ui: 'Trebuchet MS', 'Segoe UI', sans-serif;
+  --font-editor: 'Courier New', Courier, monospace;
+  --font-preview: 'Book Antiqua', Palatino, 'Times New Roman', 'Noto Serif SC', serif;
 }
 :root[data-font='9'] {
-  --font-ui: 'Segoe UI Variable', 'Segoe UI', sans-serif;
-  --font-editor: 'Cascadia Mono', Consolas, monospace;
-  --font-preview: 'Sitka Text', Georgia, serif;
+  --font-ui: 'Segoe UI Variable', 'Segoe UI', system-ui, sans-serif;
+  --font-editor: 'Cascadia Mono', 'Cascadia Code', Consolas, monospace;
+  --font-preview: 'Sitka Text', 'Sitka', Georgia, 'Noto Serif SC', serif;
 }
 :root[data-font='10'] {
   --font-ui: 'Noto Sans SC', 'Microsoft YaHei', 'PingFang SC', sans-serif;
   --font-editor: 'Noto Sans Mono CJK SC', 'Sarasa Mono SC', Consolas, monospace;
-  --font-preview: 'Noto Serif SC', 'Source Han Serif SC', SimSun, serif;
+  --font-preview: 'Noto Sans SC', 'Microsoft YaHei', 'PingFang SC', sans-serif;
 }
 :root[data-font='11'] {
-  --font-ui: 'Hiragino Sans GB', 'Microsoft YaHei', system-ui, sans-serif;
-  --font-editor: ui-monospace, monospace;
-  --font-preview: 'STKaiti', KaiTi, 'Noto Serif SC', serif;
+  --font-ui: 'STKaiti', 'KaiTi', 'Noto Serif SC', serif;
+  --font-editor: 'Sarasa Mono SC', Consolas, monospace;
+  --font-preview: 'STKaiti', 'KaiTi', 'Noto Serif SC', 'STSong', serif;
 }
 :root[data-font='12'] {
-  --font-ui: 'PingFang SC', 'Microsoft YaHei', system-ui, sans-serif;
-  --font-editor: 'Menlo', 'Monaco', Consolas, monospace;
-  --font-preview: 'Songti SC', SimSun, 'Noto Serif SC', serif;
+  --font-ui: 'PingFang SC', 'Microsoft YaHei', 'Hiragino Sans GB', sans-serif;
+  --font-editor: 'SF Mono', Menlo, Consolas, monospace;
+  --font-preview: 'PingFang SC', 'Hiragino Sans GB', 'Microsoft YaHei', sans-serif;
 }
 :root[data-font='13'] {
-  --font-ui: 'Hiragino Sans GB', 'PingFang SC', sans-serif;
+  --font-ui: 'Hiragino Sans GB', 'PingFang SC', 'Microsoft YaHei', sans-serif;
   --font-editor: 'SF Mono', Menlo, Consolas, monospace;
-  --font-preview: 'Hiragino Mincho ProN', 'Songti SC', serif;
+  --font-preview: 'Hiragino Mincho ProN', 'Songti SC', 'Noto Serif SC', serif;
 }
 :root[data-font='14'] {
   --font-ui: 'LXGW WenKai', 'KaiTi', 'Microsoft YaHei', sans-serif;
@@ -401,89 +401,89 @@
   --font-preview: 'LXGW WenKai', 'KaiTi', 'Noto Serif SC', serif;
 }
 :root[data-font='15'] {
-  --font-ui: 'HarmonyOS Sans', 'Microsoft YaHei', system-ui, sans-serif;
-  --font-editor: 'HarmonyOS Sans Mono', Consolas, monospace;
-  --font-preview: 'HarmonyOS Serif', 'Noto Serif SC', serif;
+  --font-ui: 'HarmonyOS Sans', 'Microsoft YaHei', 'PingFang SC', sans-serif;
+  --font-editor: 'HarmonyOS Sans Mono', 'JetBrains Mono', Consolas, monospace;
+  --font-preview: 'HarmonyOS Sans', 'Microsoft YaHei', 'PingFang SC', sans-serif;
 }
 :root[data-font='16'] {
-  --font-ui: 'OPPO Sans', 'Microsoft YaHei', system-ui, sans-serif;
-  --font-editor: 'OPPO Sans Mono', Consolas, monospace;
-  --font-preview: 'Source Han Serif SC', SimSun, serif;
+  --font-ui: 'OPPO Sans', 'Microsoft YaHei', 'PingFang SC', sans-serif;
+  --font-editor: 'JetBrains Mono', Consolas, monospace;
+  --font-preview: 'OPPO Sans', 'Microsoft YaHei', 'PingFang SC', sans-serif;
 }
 :root[data-font='17'] {
-  --font-ui: 'MiSans', 'Microsoft YaHei', system-ui, sans-serif;
-  --font-editor: 'MiSans Mono', Consolas, monospace;
-  --font-preview: 'Noto Serif SC', 'Source Han Serif SC', serif;
+  --font-ui: 'MiSans', 'Microsoft YaHei', 'PingFang SC', sans-serif;
+  --font-editor: 'JetBrains Mono', Consolas, monospace;
+  --font-preview: 'MiSans', 'Microsoft YaHei', 'PingFang SC', sans-serif;
 }
 :root[data-font='18'] {
-  --font-ui: 'Alibaba PuHuiTi', 'Microsoft YaHei', sans-serif;
+  --font-ui: 'Alibaba PuHuiTi', 'Microsoft YaHei', 'PingFang SC', sans-serif;
   --font-editor: 'JetBrains Mono', Consolas, monospace;
-  --font-preview: 'Alibaba PuHuiTi', 'Noto Serif SC', serif;
+  --font-preview: 'Alibaba PuHuiTi', 'Microsoft YaHei', 'PingFang SC', sans-serif;
 }
 :root[data-font='19'] {
-  --font-ui: 'Smiley Sans', 'Microsoft YaHei', sans-serif;
+  --font-ui: 'Smiley Sans', 'Microsoft YaHei', 'PingFang SC', sans-serif;
   --font-editor: 'JetBrains Mono', Consolas, monospace;
-  --font-preview: 'Smiley Sans', 'Noto Serif SC', serif;
+  --font-preview: 'Smiley Sans', 'Microsoft YaHei', 'PingFang SC', sans-serif;
 }
 :root[data-font='20'] {
-  --font-ui: system-ui, sans-serif;
+  --font-ui: 'Maple Mono', 'Cascadia Code', Consolas, monospace;
   --font-editor: 'Maple Mono', 'Cascadia Code', Consolas, monospace;
-  --font-preview: 'Source Serif 4', Georgia, serif;
+  --font-preview: 'Maple Mono', 'Cascadia Code', Consolas, monospace;
 }
 :root[data-font='21'] {
   --font-ui: 'Fira Sans', system-ui, sans-serif;
   --font-editor: 'Fira Code', 'Fira Mono', Consolas, monospace;
-  --font-preview: 'Fira Sans', Georgia, serif;
+  --font-preview: 'Fira Sans', system-ui, 'PingFang SC', sans-serif;
 }
 :root[data-font='22'] {
   --font-ui: 'Roboto', system-ui, sans-serif;
   --font-editor: 'Roboto Mono', Consolas, monospace;
-  --font-preview: 'Roboto Slab', Georgia, serif;
+  --font-preview: 'Roboto Slab', Georgia, 'Noto Serif SC', serif;
 }
 :root[data-font='23'] {
   --font-ui: 'Open Sans', system-ui, sans-serif;
   --font-editor: 'Source Code Pro', Consolas, monospace;
-  --font-preview: 'Merriweather', Georgia, serif;
+  --font-preview: 'Merriweather', Georgia, 'Noto Serif SC', serif;
 }
 :root[data-font='24'] {
   --font-ui: 'Lato', system-ui, sans-serif;
   --font-editor: 'Ubuntu Mono', Consolas, monospace;
-  --font-preview: 'Lora', Georgia, serif;
+  --font-preview: 'Lora', Georgia, 'Noto Serif SC', serif;
 }
 :root[data-font='25'] {
   --font-ui: 'Montserrat', system-ui, sans-serif;
   --font-editor: 'Space Mono', Consolas, monospace;
-  --font-preview: 'Playfair Display', Georgia, serif;
+  --font-preview: 'Playfair Display', Georgia, 'Noto Serif SC', serif;
 }
 :root[data-font='26'] {
   --font-ui: 'Merriweather Sans', system-ui, sans-serif;
   --font-editor: 'Inconsolata', Consolas, monospace;
-  --font-preview: 'Merriweather', Georgia, serif;
+  --font-preview: 'Merriweather', Georgia, 'Noto Serif SC', serif;
 }
 :root[data-font='27'] {
-  --font-ui: system-ui, sans-serif;
-  --font-editor: 'Source Code Pro', monospace;
-  --font-preview: 'Crimson Text', 'Times New Roman', serif;
+  --font-ui: 'Crimson Text', Georgia, 'Times New Roman', serif;
+  --font-editor: 'Source Code Pro', Consolas, monospace;
+  --font-preview: 'Crimson Text', 'Times New Roman', 'Noto Serif SC', serif;
 }
 :root[data-font='28'] {
-  --font-ui: 'Literata', Georgia, serif;
+  --font-ui: 'Literata', Georgia, 'Noto Serif SC', serif;
   --font-editor: 'IBM Plex Mono', Consolas, monospace;
-  --font-preview: 'Literata', Georgia, serif;
+  --font-preview: 'Literata', Georgia, 'Noto Serif SC', serif;
 }
 :root[data-font='29'] {
-  --font-ui: system-ui, sans-serif;
-  --font-editor: 'Inconsolata', 'Consolas', monospace;
-  --font-preview: Georgia, 'Noto Serif SC', serif;
+  --font-ui: 'Inconsolata', Consolas, monospace;
+  --font-editor: 'Inconsolata', Consolas, monospace;
+  --font-preview: 'Inconsolata', Consolas, monospace;
 }
 :root[data-font='30'] {
-  --font-ui: system-ui, sans-serif;
+  --font-ui: 'Anonymous Pro', 'Courier New', monospace;
   --font-editor: 'Anonymous Pro', 'Courier New', monospace;
-  --font-preview: 'Palatino Linotype', Palatino, serif;
+  --font-preview: 'Anonymous Pro', 'Courier New', monospace;
 }
 :root[data-font='31'] {
-  --font-ui: system-ui, sans-serif;
+  --font-ui: 'Fantasque Sans Mono', Consolas, monospace;
   --font-editor: 'Fantasque Sans Mono', Consolas, monospace;
-  --font-preview: 'Charter', 'Noto Serif SC', serif;
+  --font-preview: 'Fantasque Sans Mono', Consolas, monospace;
 }
 
 :root[data-bg='4'] .toolbar,

src/renderer/src/appearance.ts

@@ -28,37 +28,37 @@ export const BACKGROUNDS: { id: string; name: string }[] = [
 /** 字体 id 0–31，对应 `:root[data-font]`。 */
 export const FONTS: { id: string; name: string }[] = [
   { id: '0', name: '系统默认' },
-  { id: '1', name: '衬线阅读' },
-  { id: '2', name: '等宽代码' },
-  { id: '3', name: '人文宋黑' },
-  { id: '4', name: 'IBM Plex' },
-  { id: '5', name: 'Helvetica 系' },
-  { id: '6', name: 'Georgia 系' },
-  { id: '7', name: 'Verdana 系' },
-  { id: '8', name: 'Courier 打字机' },
-  { id: '9', name: 'Segoe UI 系' },
-  { id: '10', name: '思源黑体优先' },
-  { id: '11', name: '圆体休闲' },
-  { id: '12', name: '苹方优先' },
+  { id: '1', name: '经典衬线' },
+  { id: '2', name: '现代等宽' },
+  { id: '3', name: '宋体阅读' },
+  { id: '4', name: 'IBM Plex 家族' },
+  { id: '5', name: 'Helvetica 现代' },
+  { id: '6', name: 'Georgia 优雅' },
+  { id: '7', name: 'Verdana 清晰' },
+  { id: '8', name: 'Courier 复古' },
+  { id: '9', name: 'Segoe UI 流畅' },
+  { id: '10', name: '思源黑体' },
+  { id: '11', name: '楷体古韵' },
+  { id: '12', name: '苹方雅致' },
   { id: '13', name: '冬青黑体' },
   { id: '14', name: '霞鹜文楷' },
-  { id: '15', name: 'HarmonyOS Sans' },
+  { id: '15', name: 'HarmonyOS 鸿蒙' },
   { id: '16', name: 'OPPO Sans' },
-  { id: '17', name: '小米兰亭' },
-  { id: '18', name: '阿里巴巴普惠' },
+  { id: '17', name: 'MiSans 小米' },
+  { id: '18', name: '阿里巴巴普惠体' },
   { id: '19', name: '得意黑' },
-  { id: '20', name: 'Maple Mono' },
-  { id: '21', name: 'Fira Sans + Mono' },
-  { id: '22', name: 'Roboto 系' },
-  { id: '23', name: 'Open Sans 系' },
-  { id: '24', name: 'Lato 系' },
-  { id: '25', name: 'Montserrat 系' },
+  { id: '20', name: 'Maple Mono 枫叶' },
+  { id: '21', name: 'Fira 家族' },
+  { id: '22', name: 'Roboto 家族' },
+  { id: '23', name: 'Open Sans 开放' },
+  { id: '24', name: 'Lato 优雅' },
+  { id: '25', name: 'Montserrat 现代' },
   { id: '26', name: 'Merriweather 阅读' },
-  { id: '27', name: 'Crimson Text' },
-  { id: '28', name: 'Literata 阅读' },
-  { id: '29', name: 'Inconsolata 等宽' },
-  { id: '30', name: 'Anonymous Pro' },
-  { id: '31', name: 'Fantasque Sans Mono' }
+  { id: '27', name: 'Crimson 古典' },
+  { id: '28', name: 'Literata 电子书' },
+  { id: '29', name: 'Inconsolata 代码' },
+  { id: '30', name: 'Anonymous Pro 复古码' },
+  { id: '31', name: 'Fantasque 趣味码' }
 ]
 
 export type ViewMode = 'edit' | 'read' | 'hybrid'

src/renderer/src/constants.ts

@@ -0,0 +1,14 @@
+export const BG_KEY = 'myreader-bg-id'
+export const FONT_KEY = 'myreader-font-id'
+export const VIEW_KEY = 'myreader-view'
+export const LEGACY_READ_KEY = 'myreader-read'
+export const BROWSE_KEY = 'myreader-browse'
+export const SIDEBAR_W_KEY = 'myreader-sidebar-w'
+export const SIDEBAR_HIDDEN_KEY = 'myreader-sidebar-hidden'
+export const STATS_W_KEY = 'myreader-stats-w'
+export const STATS_HIDDEN_KEY = 'myreader-stats-hidden'
+export const SPLIT_KEY = 'myreader-split'
+export const PREVIEW_W_KEY = 'myreader-preview-max'
+export const SESSION_KEY = 'myreader-session-v1'
+export const PREVIEW_LINE_KEY = 'myreader-preview-line-height'
+export const AUTO_SAVE_KEY = 'myreader-auto-save'

src/renderer/src/markdown.ts

@@ -16,6 +16,14 @@ function isMermaidFence(lang: string, content: string): boolean {
   return false
 }
 
+function escapeHtmlSafe(s: string): string {
+  return s
+    .replace(/&/g, '&')
+    .replace(/</g, '&lt;')
+    .replace(/>/g, '&gt;')
+    .replace(/"/g, '&quot;')
+}
+
 function highlightCodeBlock(content: string, lang: string): string {
   const trimmed = (lang || '').trim()
   if (trimmed && hljs.getLanguage(trimmed)) {
@@ -32,7 +40,7 @@ function highlightCodeBlock(content: string, lang: string): string {
       /* fall through */
     }
   }
-  return md.utils.escapeHtml(content)
+  return escapeHtmlSafe(content)
 }
 
 const md = new MarkdownIt({

src/renderer/src/types.ts

@@ -0,0 +1,9 @@
+export type Tab = {
+  id: string
+  filePath: string | null
+  content: string
+  savedContent: string
+}
+
+export type SessionTabRow = { path: string | null; content: string; saved: string }
+export type SessionV1 = { v: 1; activeIndex: number; tabs: SessionTabRow[]; bgId?: string; fontId?: string }

src/renderer/src/utils.ts

@@ -0,0 +1,50 @@
+import type { Tab } from './types'
+import { PREVIEW_LINE_KEY, LEGACY_READ_KEY, VIEW_KEY } from './constants'
+import type { ViewMode } from './appearance'
+
+export function clamp(n: number, min: number, max: number): number {
+  return Math.min(max, Math.max(min, n))
+}
+
+export function normalizePathKey(p: string): string {
+  return p.replace(/\\/g, '/').toLowerCase()
+}
+
+export function newTab(): Tab {
+  const id = crypto.randomUUID()
+  return { id, filePath: null, content: '', savedContent: '' }
+}
+
+export function tabLabel(t: Tab): string {
+  if (t.filePath) {
+    const parts = t.filePath.split(/[/\\]/)
+    return parts[parts.length - 1] || t.filePath
+  }
+  return '未命名'
+}
+
+export function isDirty(t: Tab): boolean {
+  return t.content !== t.savedContent
+}
+
+export function loadViewMode(): ViewMode {
+  const v = localStorage.getItem(VIEW_KEY) as ViewMode | null
+  if (v === 'edit' || v === 'read' || v === 'hybrid') return v
+  if (localStorage.getItem(LEGACY_READ_KEY) === '1') return 'read'
+  if (localStorage.getItem(LEGACY_READ_KEY) === '0') return 'edit'
+  return 'read'
+}
+
+export function viewModeLabel(m: ViewMode): string {
+  if (m === 'edit') return '编辑'
+  if (m === 'read') return '阅读'
+  return '分栏'
+}
+
+export function loadPreviewLineHeight(): string {
+  const raw = localStorage.getItem(PREVIEW_LINE_KEY)
+  if (!raw) return '1.5'
+  const n = Number.parseFloat(raw)
+  if (!Number.isFinite(n)) return '1.5'
+  return String(Math.min(3, Math.max(1, n)))
+}