diff --git a/web/src/app/Icon.vue b/web/src/app/Icon.vue
index 0b0240c..35676e1 100644
--- a/web/src/app/Icon.vue
+++ b/web/src/app/Icon.vue
@@ -19,6 +19,7 @@ const paths = {
   settings: 'M12 15a3 3 0 1 0 0-6 3 3 0 0 0 0 6zM19.4 15a1.7 1.7 0 0 0 .3 1.8l.1.1a2 2 0 1 1-2.8 2.8l-.1-.1a1.7 1.7 0 0 0-1.8-.3 1.7 1.7 0 0 0-1 1.5V21a2 2 0 1 1-4 0v-.1a1.7 1.7 0 0 0-1.1-1.5 1.7 1.7 0 0 0-1.8.3l-.1.1a2 2 0 1 1-2.8-2.8l.1-.1a1.7 1.7 0 0 0 .3-1.8 1.7 1.7 0 0 0-1.5-1H3a2 2 0 1 1 0-4h.1a1.7 1.7 0 0 0 1.5-1.1 1.7 1.7 0 0 0-.3-1.8l-.1-.1a2 2 0 1 1 2.8-2.8l.1.1a1.7 1.7 0 0 0 1.8.3H9a1.7 1.7 0 0 0 1-1.5V3a2 2 0 1 1 4 0v.1a1.7 1.7 0 0 0 1 1.5 1.7 1.7 0 0 0 1.8-.3l.1-.1a2 2 0 1 1 2.8 2.8l-.1.1a1.7 1.7 0 0 0-.3 1.8V9a1.7 1.7 0 0 0 1.5 1H21a2 2 0 1 1 0 4h-.1a1.7 1.7 0 0 0-1.5 1z',
   palette: 'M12 22a10 10 0 1 1 10-10c0 2.8-2.2 4-4 4h-2a2 2 0 0 0-1.5 3.3A1.7 1.7 0 0 1 12 22zM7.5 10.5h.01M12 7.5h.01M16.5 10.5h.01',
   user: 'M20 21v-2a4 4 0 0 0-4-4H8a4 4 0 0 0-4 4v2M12 11a4 4 0 1 0 0-8 4 4 0 0 0 0 8z',
+  outline: 'M8 6h13M8 12h13M8 18h13M3 6h.01M3 12h.01M3 18h.01',
   command: 'M18 3a3 3 0 0 0-3 3v12a3 3 0 1 0 3-3H6a3 3 0 1 0 3 3V6a3 3 0 1 0-3 3h12a3 3 0 0 0 0-6z',
 }
 export type IconName = keyof typeof paths
diff --git a/web/src/app/OutlinePanel.vue b/web/src/app/OutlinePanel.vue
new file mode 100644
index 0000000..cd0acff
--- /dev/null
+++ b/web/src/app/OutlinePanel.vue
@@ -0,0 +1,107 @@
+<script setup lang="ts">
+import { ensureSyntaxTree, syntaxTree } from '@codemirror/language'
+import type { EditorState } from '@codemirror/state'
+import { EditorView } from '@codemirror/view'
+import { onBeforeUnmount, onMounted, ref, watch } from 'vue'
+import Icon from './Icon.vue'
+import { activeTab, editorView, onEditorUpdate, ws } from './workspace'
+
+// 大纲：当前笔记的标题列表，点击跳转；高亮光标所在的章节
+interface Heading {
+  level: number
+  text: string
+  from: number
+}
+
+const headings = ref<Heading[]>([])
+const current = ref(-1)
+
+function collect(state: EditorState): Heading[] {
+  // 长文档的语法树可能尚未解析完，最多等 50ms，之后随编辑更新
+  const tree = ensureSyntaxTree(state, state.doc.length, 50) ?? syntaxTree(state)
+  const out: Heading[] = []
+  tree.iterate({
+    enter(n) {
+      const m = /^(ATX|Setext)Heading(\d)$/.exec(n.name)
+      if (!m) return
+      const line = state.doc.lineAt(n.from)
+      const text = m[1] === 'ATX' ? line.text.replace(/^\s*#{1,6}\s*/, '').replace(/\s+#+\s*$/, '') : line.text.trim()
+      out.push({ level: Number(m[2]), text: text || '（无标题）', from: n.from })
+      return false
+    },
+  })
+  return out
+}
+
+let timer: ReturnType<typeof setTimeout> | undefined
+let lastDoc: unknown
+function refresh() {
+  const v = editorView()
+  if (!v || activeTab()?.status !== 'ready') {
+    headings.value = []
+    lastDoc = undefined
+    return
+  }
+  // 只移动光标时不重新收集标题
+  if (v.state.doc !== lastDoc) {
+    headings.value = collect(v.state)
+    lastDoc = v.state.doc
+  }
+  const head = v.state.selection.main.head
+  let i = headings.value.length - 1
+  while (i >= 0 && headings.value[i].from > head) i--
+  current.value = i
+}
+function scheduleRefresh() {
+  clearTimeout(timer)
+  timer = setTimeout(refresh, 150)
+}
+
+function jump(h: Heading) {
+  const v = editorView()
+  if (!v) return
+  v.dispatch({ selection: { anchor: h.from }, effects: EditorView.scrollIntoView(h.from, { y: 'start', yMargin: 16 }) })
+  if (matchMedia('(max-width: 768px)').matches) ws.outlineOpen = false
+  else v.focus()
+}
+
+let unsubscribe: (() => void) | undefined
+onMounted(() => {
+  unsubscribe = onEditorUpdate(scheduleRefresh)
+  // 切换标签页时编辑器整体替换状态，不经过更新监听；等编辑器面板换好状态后再读
+  requestAnimationFrame(refresh)
+})
+onBeforeUnmount(() => {
+  unsubscribe?.()
+  clearTimeout(timer)
+})
+watch(
+  () => [ws.active, activeTab()?.status],
+  () => requestAnimationFrame(refresh),
+)
+const minLevel = () => Math.min(...headings.value.map((h) => h.level))
+</script>
+
+<template>
+  <div class="rm-outline-backdrop" @click.self="ws.outlineOpen = false">
+    <aside class="rm-outline" aria-label="大纲">
+      <div class="rm-outline-head">
+        <span>大纲</span>
+        <button class="rm-icon-btn" title="关闭大纲" @click="ws.outlineOpen = false"><Icon name="close" /></button>
+      </div>
+      <ul v-if="headings.length" class="rm-outline-list">
+        <li
+          v-for="(h, i) in headings"
+          :key="h.from"
+          :class="{ on: i === current }"
+          :style="{ paddingLeft: (h.level - minLevel()) * 14 + 12 + 'px' }"
+          @mousedown.prevent
+          @click="jump(h)"
+        >
+          {{ h.text }}
+        </li>
+      </ul>
+      <p v-else class="rm-tree-empty">没有标题</p>
+    </aside>
+  </div>
+</template>
diff --git a/web/src/app/TabBar.vue b/web/src/app/TabBar.vue
index 3c6f1d0..ef3d33e 100644
--- a/web/src/app/TabBar.vue
+++ b/web/src/app/TabBar.vue
@@ -1,21 +1,94 @@
 <script setup lang="ts">
+import { ref } from 'vue'
 import Icon from './Icon.vue'
 import { noteTitle } from './paths'
 import { closeTab, ws } from './workspace'
+
+// 拖动排序：拖到某个标签的左半边插到它前面，右半边插到它后面
+const TAB_TYPE = 'application/x-rawmark-tab'
+const dragging = ref<string | null>(null)
+const dropAt = ref<{ path: string; after: boolean } | null>(null)
+
+function onDragStart(e: DragEvent, path: string) {
+  dragging.value = path
+  e.dataTransfer!.setData(TAB_TYPE, path)
+  e.dataTransfer!.effectAllowed = 'move'
+}
+
+function onDragOver(e: DragEvent, path: string) {
+  if (!e.dataTransfer?.types.includes(TAB_TYPE)) return
+  e.preventDefault()
+  const r = (e.currentTarget as HTMLElement).getBoundingClientRect()
+  dropAt.value = { path, after: e.clientX > r.left + r.width / 2 }
+}
+
+function onDrop(e: DragEvent) {
+  const from = dragging.value
+  const target = dropAt.value
+  dragging.value = dropAt.value = null
+  if (!from || !target || from === target.path) return
+  e.preventDefault()
+  const tab = ws.tabs.splice(
+    ws.tabs.findIndex((t) => t.path === from),
+    1,
+  )[0]
+  const i = ws.tabs.findIndex((t) => t.path === target.path) + (target.after ? 1 : 0)
+  ws.tabs.splice(i, 0, tab)
+}
+
+function onDragEnd() {
+  dragging.value = dropAt.value = null
+}
+
+// ---- 右键菜单 ----
+const menu = ref<{ path: string; x: number; y: number } | null>(null)
+
+function openMenu(e: MouseEvent, path: string) {
+  menu.value = { path, x: Math.min(e.clientX, innerWidth - 200), y: e.clientY }
+}
+
+async function closeMany(keep: (index: number, path: string) => boolean) {
+  const paths = ws.tabs.filter((t, i) => !keep(i, t.path)).map((t) => t.path)
+  menu.value = null
+  for (const p of paths) await closeTab(p)
+}
+
+function closeOthers(path: string) {
+  void closeMany((_, p) => p === path)
+}
+
+function closeRight(path: string) {
+  const at = ws.tabs.findIndex((t) => t.path === path)
+  void closeMany((i) => i <= at)
+}
 </script>
 
 <template>
-  <nav class="rm-tabs" role="tablist">
+  <nav class="rm-tabs" :class="{ empty: !ws.tabs.length && !ws.sidebarCollapsed }" role="tablist">
+    <button v-if="ws.sidebarCollapsed" class="rm-icon-btn rm-tabs-side" title="显示侧栏（Ctrl+\）" @click="ws.sidebarCollapsed = false">
+      <Icon name="menu" />
+    </button>
     <div
       v-for="tab in ws.tabs"
       :key="tab.path"
       class="rm-tab"
-      :class="{ active: ws.active === tab.path }"
+      :class="{
+        active: ws.active === tab.path,
+        dragging: dragging === tab.path,
+        'drop-before': dropAt?.path === tab.path && !dropAt.after,
+        'drop-after': dropAt?.path === tab.path && dropAt.after,
+      }"
       role="tab"
       :aria-selected="ws.active === tab.path"
       :title="tab.path"
+      draggable="true"
       @click="ws.active = tab.path"
       @auxclick.prevent="$event.button === 1 && closeTab(tab.path)"
+      @contextmenu.prevent="openMenu($event, tab.path)"
+      @dragstart="onDragStart($event, tab.path)"
+      @dragover="onDragOver($event, tab.path)"
+      @drop="onDrop"
+      @dragend="onDragEnd"
     >
       <span class="rm-tab-title">{{ noteTitle(tab.path) }}</span>
       <button class="rm-tab-close" :class="{ dirty: tab.dirty }" title="关闭" @click.stop="closeTab(tab.path)">
@@ -23,5 +96,16 @@ import { closeTab, ws } from './workspace'
         <Icon name="close" :size="12" />
       </button>
     </div>
+    <button v-if="ws.active" class="rm-icon-btn rm-tabs-outline" :class="{ on: ws.outlineOpen }" title="大纲（Ctrl+Shift+O）" @click="ws.outlineOpen = !ws.outlineOpen">
+      <Icon name="outline" />
+    </button>
+    <template v-if="menu">
+      <div class="rm-menu-backdrop" @click="menu = null" @contextmenu.prevent="menu = null" />
+      <div class="rm-menu rm-tab-menu" :style="{ left: menu.x + 'px', top: menu.y + 'px' }">
+        <button @click="closeMany((_, p) => p !== menu!.path)">关闭</button>
+        <button @click="closeOthers(menu.path)">关闭其他标签页</button>
+        <button @click="closeRight(menu.path)">关闭右侧标签页</button>
+      </div>
+    </template>
   </nav>
 </template>
diff --git a/web/src/app/Workspace.vue b/web/src/app/Workspace.vue
index 8d127c1..d0500ac 100644
--- a/web/src/app/Workspace.vue
+++ b/web/src/app/Workspace.vue
@@ -7,10 +7,12 @@ import Icon from './Icon.vue'
 import MobileToolbar from './MobileToolbar.vue'
 import MoveDialog from './MoveDialog.vue'
 import NoteBanner from './NoteBanner.vue'
+import OutlinePanel from './OutlinePanel.vue'
 import QuickSwitcher from './QuickSwitcher.vue'
 import SettingsDialog from './SettingsDialog.vue'
 import ShareDialog from './ShareDialog.vue'
 import { noteTitle } from './paths'
+import { SIDEBAR_WIDTH, settings, updateSettings } from './settings'
 import Sidebar from './Sidebar.vue'
 import TabBar from './TabBar.vue'
 import { activeTab, flushAll, startWorkspace, stopWorkspace, toast, ws } from './workspace'
@@ -19,6 +21,26 @@ const emit = defineEmits<{ logout: [] }>()
 const title = computed(() => (ws.active ? noteTitle(ws.active) : 'RawMark'))
 const saving = computed(() => activeTab()?.dirty)
 
+// 拖动侧栏右缘调整宽度：拖动中只改 CSS 变量，松手后保存到设置
+function startResize(e: PointerEvent) {
+  const handle = e.currentTarget as HTMLElement
+  handle.setPointerCapture(e.pointerId)
+  const startX = e.clientX
+  const startWidth = settings.sidebarWidth
+  let width = startWidth
+  const onMove = (ev: PointerEvent) => {
+    width = Math.round(Math.min(SIDEBAR_WIDTH.max, Math.max(SIDEBAR_WIDTH.min, startWidth + ev.clientX - startX)))
+    document.documentElement.style.setProperty('--rm-sidebar-width', width + 'px')
+  }
+  const onUp = () => {
+    handle.removeEventListener('pointermove', onMove)
+    handle.removeEventListener('pointerup', onUp)
+    if (width !== startWidth) updateSettings({ sidebarWidth: width }).catch(() => toast('保存侧栏宽度失败'))
+  }
+  handle.addEventListener('pointermove', onMove)
+  handle.addEventListener('pointerup', onUp)
+}
+
 async function logout() {
   await flushAll()
   try {
@@ -33,14 +55,26 @@ async function logout() {
 
 // 移动端：从屏幕左边缘右滑打开侧栏
 let touchX: number | null = null
+// 侧栏打开时向左滑关闭（以水平方向为主，避免与列表上下滚动冲突）
+let touchStart: { x: number; y: number } | null = null
 function onTouchStart(e: TouchEvent) {
-  touchX = e.touches[0].clientX < 24 ? e.touches[0].clientX : null
+  const t = e.touches[0]
+  touchX = t.clientX < 24 ? t.clientX : null
+  touchStart = { x: t.clientX, y: t.clientY }
 }
 function onTouchMove(e: TouchEvent) {
-  if (touchX !== null && e.touches[0].clientX - touchX > 60) {
+  const t = e.touches[0]
+  if (touchX !== null && t.clientX - touchX > 60) {
     ws.sidebarOpen = true
     touchX = null
   }
+  if (ws.sidebarOpen && touchStart) {
+    const dx = t.clientX - touchStart.x
+    if (dx < -60 && Math.abs(t.clientY - touchStart.y) < Math.abs(dx) / 2) {
+      ws.sidebarOpen = false
+      touchStart = null
+    }
+  }
 }
 
 const unregisterLogout = registerCommand({ id: 'app.logout', title: '退出登录', run: () => void logout() })
@@ -53,14 +87,23 @@ onBeforeUnmount(() => {
 </script>
 
 <template>
-  <div class="rm-shell" :class="{ 'sidebar-open': ws.sidebarOpen }" @touchstart.passive="onTouchStart" @touchmove.passive="onTouchMove">
-    <aside class="rm-sidebar"><Sidebar @logout="logout" /></aside>
+  <div
+    class="rm-shell"
+    :class="{ 'sidebar-open': ws.sidebarOpen, 'sidebar-collapsed': ws.sidebarCollapsed }"
+    @touchstart.passive="onTouchStart"
+    @touchmove.passive="onTouchMove"
+  >
+    <aside class="rm-sidebar">
+      <Sidebar @logout="logout" />
+      <div class="rm-sidebar-resize" title="拖动调整宽度" @pointerdown.prevent="startResize" />
+    </aside>
     <div class="rm-backdrop" @click="ws.sidebarOpen = false" />
     <main class="rm-main">
       <header class="rm-mobile-bar">
         <button class="rm-icon-btn" title="目录" @click="ws.sidebarOpen = true"><Icon name="menu" :size="20" /></button>
-        <span class="rm-mobile-title">{{ title }}</span>
+        <button class="rm-mobile-title" title="切换笔记" @click="ws.switcher = ''">{{ title }}</button>
         <span class="rm-save-state" :class="{ on: saving }" />
+        <button v-if="ws.active" class="rm-icon-btn" title="大纲" @click="ws.outlineOpen = !ws.outlineOpen"><Icon name="outline" :size="20" /></button>
         <button class="rm-icon-btn" title="快速打开" @click="ws.switcher = ''"><Icon name="search" :size="20" /></button>
         <button class="rm-icon-btn" title="命令" @click="ws.switcher = '>'"><Icon name="command" :size="20" /></button>
       </header>
@@ -69,6 +112,7 @@ onBeforeUnmount(() => {
       <EditorPane />
       <MobileToolbar />
     </main>
+    <OutlinePanel v-if="ws.outlineOpen && ws.active" />
     <QuickSwitcher v-if="ws.switcher !== null" />
     <SettingsDialog v-if="ws.settings" />
     <ShareDialog v-if="ws.sharing" :path="ws.sharing" @close="ws.sharing = null" />
diff --git a/web/src/app/app.css b/web/src/app/app.css
index b13fa2c..1ce4a5e 100644
--- a/web/src/app/app.css
+++ b/web/src/app/app.css
@@ -106,12 +106,26 @@ button {
 /* ---- 布局 ---- */
 .rm-shell { display: flex; height: 100%; }
 .rm-sidebar {
+  position: relative;
   width: var(--rm-sidebar-width);
   flex: none;
   background: var(--rm-sidebar-bg);
   border-right: 1px solid var(--rm-divider);
 }
 .rm-main { flex: 1; min-width: 0; display: flex; flex-direction: column; }
+.rm-sidebar-resize { position: absolute; top: 0; right: -3px; bottom: 0; width: 6px; cursor: col-resize; z-index: 5; touch-action: none; }
+.rm-sidebar-resize:hover,
+.rm-sidebar-resize:active { background: var(--rm-accent); opacity: 0.4; }
+.sidebar-collapsed .rm-sidebar { display: none; }
+
+/* ---- 大纲 ---- */
+.rm-outline-backdrop { display: contents; }
+.rm-outline { flex: none; width: 240px; display: flex; flex-direction: column; border-left: 1px solid var(--rm-divider); background: var(--rm-sidebar-bg); }
+.rm-outline-head { display: flex; align-items: center; justify-content: space-between; padding: 10px 8px 6px 16px; font-size: 13px; font-weight: 600; color: var(--rm-text-muted); }
+.rm-outline-list { flex: 1; overflow-y: auto; list-style: none; margin: 0; padding: 0 6px 12px; }
+.rm-outline-list li { padding-top: 5px; padding-bottom: 5px; padding-right: 8px; border-radius: 6px; font-size: 13px; line-height: 1.4; cursor: pointer; overflow: hidden; text-overflow: ellipsis; white-space: nowrap; }
+.rm-outline-list li:hover { background: var(--rm-hover); }
+.rm-outline-list li.on { color: var(--rm-accent-strong); background: var(--rm-active); }
 .rm-backdrop,
 .rm-mobile-bar { display: none; }
 
@@ -284,7 +298,15 @@ button {
   scrollbar-width: none;
   flex: none;
 }
-.rm-tabs:empty { display: none; }
+.rm-tabs.empty { display: none; }
+.rm-tabs-side,
+.rm-tabs-outline { flex: none; align-self: center; margin-bottom: 4px; }
+.rm-tabs-outline { margin-left: auto; position: sticky; right: 0; background: var(--rm-bg); }
+.rm-tabs-outline.on { color: var(--rm-accent-strong); }
+.rm-tab.dragging { opacity: 0.5; }
+.rm-tab.drop-before { box-shadow: inset 2px 0 0 var(--rm-accent); }
+.rm-tab.drop-after { box-shadow: inset -2px 0 0 var(--rm-accent); }
+.rm-tab-menu { position: fixed; z-index: 20; min-width: 160px; }
 .rm-tab {
   display: flex;
   align-items: center;
@@ -479,13 +501,20 @@ button {
     border-bottom: 1px solid var(--rm-divider);
     flex: none;
   }
-  .rm-mobile-bar .rm-icon-btn { width: 40px; height: 40px; }
-  .rm-mobile-title { flex: 1; font-weight: 600; overflow: hidden; text-overflow: ellipsis; white-space: nowrap; }
+  .rm-mobile-bar .rm-icon-btn { width: 44px; height: 44px; }
+  .rm-mobile-title { flex: 1; min-width: 0; height: 40px; padding: 0 4px; border: 0; background: none; color: var(--rm-text); font: inherit; font-weight: 600; text-align: left; overflow: hidden; text-overflow: ellipsis; white-space: nowrap; }
+  .sidebar-collapsed .rm-sidebar { display: block; }
+  .rm-sidebar-resize { display: none; }
+  /* 大纲在手机上为从右侧滑入的浮层 */
+  .rm-outline-backdrop { display: block; position: fixed; inset: 0; z-index: 41; background: rgba(0, 0, 0, 0.3); }
+  .rm-outline { position: absolute; top: 0; right: 0; bottom: 0; width: min(80vw, 300px); padding-top: env(safe-area-inset-top); box-shadow: var(--rm-shadow); }
+  .rm-outline-list li { padding-top: 12px; padding-bottom: 12px; font-size: 15px; }
   .rm-save-state { width: 8px; height: 8px; margin-right: 8px; border-radius: 50%; background: transparent; }
   .rm-save-state.on { background: var(--rm-accent); }
-  .rm-tree-row { height: 40px; font-size: 15px; }
-  .rm-tree-more { opacity: 1; width: 36px; height: 36px; }
-  .rm-sidebar-head .rm-icon-btn { width: 40px; height: 40px; }
+  /* 触控热区不小于 44px */
+  .rm-tree-row { height: 44px; font-size: 15px; }
+  .rm-tree-more { opacity: 1; width: 44px; height: 44px; }
+  .rm-sidebar-head .rm-icon-btn { width: 44px; height: 44px; }
   /* 小于 16px 时 iOS Safari 聚焦输入框会自动放大页面 */
   .rm-search-input { height: 40px; font-size: 16px; }
   .rm-auth-card input,
diff --git a/web/src/app/settings.ts b/web/src/app/settings.ts
index 834ee63..0f93e3a 100644
--- a/web/src/app/settings.ts
+++ b/web/src/app/settings.ts
@@ -12,7 +12,9 @@ export const CONTENT_WIDTHS = [
   { label: '全宽', value: 0 },
 ]
 
-const DEFAULTS = { fontSize: 16, contentWidth: 760 }
+export const SIDEBAR_WIDTH = { min: 200, max: 480 }
+
+const DEFAULTS = { fontSize: 16, contentWidth: 760, sidebarWidth: 260 }
 export type Settings = typeof DEFAULTS
 
 const CACHE_KEY = 'rawmark.settings'
@@ -29,6 +31,10 @@ function sanitize(raw: Record<string, unknown>): Settings {
       CONTENT_WIDTHS.map((w) => w.value),
       DEFAULTS.contentWidth,
     ),
+    sidebarWidth:
+      Number.isInteger(raw.sidebarWidth) && (raw.sidebarWidth as number) >= SIDEBAR_WIDTH.min && (raw.sidebarWidth as number) <= SIDEBAR_WIDTH.max
+        ? (raw.sidebarWidth as number)
+        : DEFAULTS.sidebarWidth,
   }
 }
 
@@ -38,6 +44,7 @@ function applied(next: Settings) {
   const root = document.documentElement.style
   root.setProperty('--rm-font-size', settings.fontSize + 'px')
   root.setProperty('--rm-content-width', settings.contentWidth ? settings.contentWidth + 'px' : 'none')
+  root.setProperty('--rm-sidebar-width', settings.sidebarWidth + 'px')
 }
 
 applied({ ...settings })
diff --git a/web/src/app/workspace.ts b/web/src/app/workspace.ts
index 5e08849..cd7bf46 100644
--- a/web/src/app/workspace.ts
+++ b/web/src/app/workspace.ts
@@ -35,6 +35,9 @@ export interface Toast {
 }
 
 const RECENT_KEY = 'rawmark.recent'
+// 本机的界面状态（不属于设置）：侧栏折叠、大纲面板
+const LAYOUT_KEY = 'rawmark.layout'
+const layout = JSON.parse(localStorage.getItem(LAYOUT_KEY) ?? '{}') as { sidebarCollapsed?: boolean; outlineOpen?: boolean }
 const RECENT_MAX = 30
 
 export const ws = reactive({
@@ -55,6 +58,10 @@ export const ws = reactive({
   sharing: null as string | null,
   // 「移动到…」对话框（笔记或文件夹路径）
   moving: null as string | null,
+  // 电脑上侧栏折叠
+  sidebarCollapsed: layout.sidebarCollapsed ?? false,
+  // 大纲面板（电脑上在右侧常驻，手机上为浮层）
+  outlineOpen: layout.outlineOpen ?? false,
   // 最近打开的笔记，最新的在前
   recent: JSON.parse(localStorage.getItem(RECENT_KEY) ?? '[]') as string[],
   toasts: [] as Toast[],
@@ -87,6 +94,13 @@ let opsInFlight = 0
 
 const externalChange = Annotation.define<boolean>()
 
+// 编辑器内容或光标变化的订阅者（大纲面板）；不经过 Vue 响应式，避免每次按键都触发组件更新
+const editorListeners = new Set<() => void>()
+export function onEditorUpdate(fn: () => void): () => void {
+  editorListeners.add(fn)
+  return () => editorListeners.delete(fn)
+}
+
 export function tabOf(path: string | null): Tab | undefined {
   return path === null ? undefined : ws.tabs.find((t) => t.path === path)
 }
@@ -164,6 +178,9 @@ function buildState(path: string, doc: string): EditorState {
       if (!u.transactions.some((tr) => tr.annotation(externalChange))) scheduleSave(ref.path)
     },
     extensions: [
+      EditorView.updateListener.of((u) => {
+        if (u.docChanged || u.selectionSet) editorListeners.forEach((fn) => fn())
+      }),
       pasteImages({
         upload: (file) => api.upload(ref.path, file),
         onError: (err) => toast('图片上传失败：' + errorText(err)),
@@ -762,9 +779,17 @@ export async function startWorkspace() {
     () => ws.recent,
     (r) => localStorage.setItem(RECENT_KEY, JSON.stringify(r)),
   )
+  watch(
+    () => ({ sidebarCollapsed: ws.sidebarCollapsed, outlineOpen: ws.outlineOpen }),
+    (l) => {
+      localStorage.setItem(LAYOUT_KEY, JSON.stringify(l))
+      // 编辑区宽度变化，需要重新测量
+      requestAnimationFrame(() => view?.requestMeasure())
+    },
+  )
   // 字号、正文宽度变化后行高随之改变，编辑器需要重新测量
   watch(
-    () => [settings.fontSize, settings.contentWidth],
+    () => [settings.fontSize, settings.contentWidth, settings.sidebarWidth],
     () => view?.requestMeasure(),
   )
   // 页面隐藏/关闭前尽力发出待保存的修改（部分浏览器关闭标签页时只触发 pagehide）
@@ -802,6 +827,8 @@ function registerBuiltinCommands() {
     // 浏览器不允许网页覆盖 Ctrl+W
     { id: 'tab.close', title: '关闭当前标签页', when: hasNote, run: () => void closeTab(ws.active!) },
     { id: 'app.settings', title: '设置', keys: ['Mod+,'], run: () => (ws.settings = 'index') },
+    { id: 'view.sidebar', title: '显示/隐藏侧栏', keys: ['Mod+\\'], run: toggleSidebar },
+    { id: 'view.outline', title: '显示/隐藏大纲', keys: ['Mod+Shift+O'], when: hasNote, run: () => (ws.outlineOpen = !ws.outlineOpen) },
     { id: 'app.trash', title: '打开回收站', run: () => (ws.settings = 'trash') },
     { id: 'note.share', title: '分享当前笔记', when: hasNote, run: () => (ws.sharing = ws.active) },
     { id: 'app.shares', title: '管理分享链接', run: () => (ws.settings = 'shares') },
@@ -811,16 +838,24 @@ function registerBuiltinCommands() {
   }
 }
 
+// 手机上侧栏是抽屉，电脑上折叠/展开
+function toggleSidebar() {
+  if (matchMedia('(max-width: 768px)').matches) ws.sidebarOpen = !ws.sidebarOpen
+  else ws.sidebarCollapsed = !ws.sidebarCollapsed
+}
+
 // 需要在目录树中操作的命令：切回目录树，移动端打开侧栏
 function withSidebar(fn: () => unknown) {
   ws.searchOpen = false
   ws.sidebarOpen = true
+  ws.sidebarCollapsed = false
   void fn()
 }
 
 export function openSearch() {
   ws.searchOpen = true
   ws.sidebarOpen = true
+  ws.sidebarCollapsed = false
   // 已打开时重新聚焦并全选，便于直接输入新的搜索词
   void nextTick(() => {
     const input = document.querySelector<HTMLInputElement>('.rm-search-input')