diff --git a/site/.vitepress/config/index.ts b/site/.vitepress/config/index.ts
index abe38149f..1ccbd485e 100644
--- a/site/.vitepress/config/index.ts
+++ b/site/.vitepress/config/index.ts
@@ -89,6 +89,12 @@ export default withDrawio(defineConfig({
       {},
       `(function(){try{var s=localStorage.getItem('vp-font-size')||'normal';if(s!=='xxsmall'&&s!=='small'&&s!=='normal'&&s!=='large'&&s!=='xxlarge'){s='normal';}document.documentElement.dataset.fontSize=s;}catch(e){}})()`,
     ],
+    // 首屏立即应用侧栏宽度(左导航 + 右大纲),防刷新闪烁。key 与 ResizableSidebar.vue 一致。
+    [
+      'script',
+      {},
+      `(function(){try{var w=parseInt(localStorage.getItem('vp-sidebar-width'));if(!w||w<200||w>480){w=272;}document.documentElement.style.setProperty('--vp-sidebar-width',w+'px');var a=parseInt(localStorage.getItem('vp-aside-width'));if(!a||a<180||a>360){a=256;}document.documentElement.style.setProperty('--vp-aside-width',a+'px');}catch(e){}})()`,
+    ],
   ],
 
   markdown: sharedMarkdown,
diff --git a/site/.vitepress/config/shared.ts b/site/.vitepress/config/shared.ts
index 53ba0495a..3652b9045 100644
--- a/site/.vitepress/config/shared.ts
+++ b/site/.vitepress/config/shared.ts
@@ -62,6 +62,12 @@ export const sharedBase = {
       {},
       `(function(){try{var s=localStorage.getItem('vp-font-size')||'normal';if(s!=='xxsmall'&&s!=='small'&&s!=='normal'&&s!=='large'&&s!=='xxlarge'){s='normal';}document.documentElement.dataset.fontSize=s;}catch(e){}})()`,
     ],
+    // 首屏立即应用侧栏宽度(左导航 + 右大纲),防刷新闪烁。key 与 ResizableSidebar.vue 一致。
+    [
+      'script',
+      {},
+      `(function(){try{var w=parseInt(localStorage.getItem('vp-sidebar-width'));if(!w||w<200||w>480){w=272;}document.documentElement.style.setProperty('--vp-sidebar-width',w+'px');var a=parseInt(localStorage.getItem('vp-aside-width'));if(!a||a<180||a>360){a=256;}document.documentElement.style.setProperty('--vp-aside-width',a+'px');}catch(e){}})()`,
+    ],
   ],
 
   markdown: sharedMarkdown,
diff --git a/site/.vitepress/theme/components/ResizableSidebar.vue b/site/.vitepress/theme/components/ResizableSidebar.vue
new file mode 100644
index 000000000..aeaf3606d
--- /dev/null
+++ b/site/.vitepress/theme/components/ResizableSidebar.vue
@@ -0,0 +1,177 @@
+<script setup lang="ts">
+import { onMounted, onBeforeUnmount, ref } from 'vue'
+
+// 可拖拽侧栏宽度:左导航树 + 右大纲栏(TOC)。
+// 左栏 --vp-sidebar-width 由 VitePress 全链路消费(sidebar 自身 / 正文 padding-left / 顶栏对齐),
+//   改这一个变量即全联动。但 handle 的定位与拖动计算必须读 .VPSidebar 的实际几何 —— 宽屏
+//   (≥1440px)布局居中,sidebar 左缘非 0、右缘带 (vw-maxW)/2 偏移,且受滚动条宽度影响,
+//   CSS 公式推算总有小偏差。故 left 一律用 JS 读 getBoundingClientRect 精确设定(与右 handle 同策略)。
+// 右栏 --vp-aside-width 自定义变量(在 custom.css 覆盖 aside max-width);右 handle absolute
+//   注入 aside 内,MutationObserver 在路由切换重建 aside 时重新注入。
+// 宽度持久化 localStorage;首屏防闪由 config head 内联脚本(hydration 前注入变量)负责。
+
+type Side = 'left' | 'right'
+interface Dim { min: number; max: number; def: number; key: string; cssVar: string }
+
+const CONF: Record<Side, Dim> = {
+  left: { min: 200, max: 480, def: 272, key: 'vp-sidebar-width', cssVar: '--vp-sidebar-width' },
+  right: { min: 180, max: 360, def: 256, key: 'vp-aside-width', cssVar: '--vp-aside-width' },
+}
+
+const leftHandle = ref<HTMLElement | null>(null)
+const RIGHT_HANDLE_ID = 'rs-right-handle'
+
+const clamp = (v: number, min: number, max: number) => Math.min(max, Math.max(min, v))
+const applyVar = (side: Side, px: number) =>
+  document.documentElement.style.setProperty(CONF[side].cssVar, px + 'px')
+const persist = (side: Side, px: number) => {
+  try { localStorage.setItem(CONF[side].key, String(px)) } catch { /* 隐私模式 / 配额 */ }
+}
+
+interface DragCtx {
+  side: Side
+  dim: Dim
+  lastV: number
+  handle: HTMLElement
+  onMove: (e: MouseEvent) => void
+  onUp: () => void
+}
+let drag: DragCtx | null = null
+
+function startDrag(side: Side, e: MouseEvent) {
+  e.preventDefault()
+  const dim = CONF[side]
+  const handle = e.currentTarget as HTMLElement
+  handle.classList.add('is-active')
+  document.body.classList.add('rs-resizing')
+
+  // 左栏:sidebar 左缘在居中布局下非 0,新宽 = 鼠标x − 左缘
+  const sidebarLeft =
+    side === 'left'
+      ? (document.querySelector('.VPSidebar') as HTMLElement | null)?.getBoundingClientRect().left ?? 0
+      : 0
+
+  const onMove = (ev: MouseEvent) => {
+    let v: number
+    if (side === 'left') {
+      v = ev.clientX - sidebarLeft
+    } else {
+      // 右栏:aside 右边缘固定(贴容器右内边),新宽 = 右边缘 − 鼠标 x
+      const aside = document.querySelector('.VPDoc.has-aside .aside') as HTMLElement | null
+      v = aside ? aside.getBoundingClientRect().right - ev.clientX : dim.def
+    }
+    if (drag) drag.lastV = clamp(Math.round(v), dim.min, dim.max)
+    applyVar(side, drag ? drag.lastV : dim.def)
+    if (side === 'left' && drag?.handle) {
+      // handle 跟随 sidebar 右缘(左缘 + 当前宽)
+      drag.handle.style.left = (sidebarLeft + drag.lastV) + 'px'
+    }
+  }
+  const onUp = () => {
+    if (drag) persist(side, drag.lastV)
+    handle.classList.remove('is-active')
+    document.body.classList.remove('rs-resizing')
+    document.removeEventListener('mousemove', onMove)
+    document.removeEventListener('mouseup', onUp)
+    drag = null
+  }
+  drag = { side, dim, lastV: dim.def, handle, onMove, onUp }
+  document.addEventListener('mousemove', onMove)
+  document.addEventListener('mouseup', onUp)
+}
+
+function reset(side: Side) {
+  applyVar(side, CONF[side].def)
+  persist(side, CONF[side].def)
+  if (side === 'left') updateLeftPosition()
+}
+
+// 仅在有侧栏的页(文档页)显示左 handle;首页等无侧栏页隐藏
+function updateLeftVisibility() {
+  if (!leftHandle.value) return
+  leftHandle.value.style.display = document.querySelector('.VPSidebar') ? '' : 'none'
+}
+
+// 左 handle 精确定位:用 offsetLeft + offsetWidth(不含 transform),避开 sidebar 入场过渡
+// (translateX(-100%)→0)对 getBoundingClientRect 的干扰 —— 首屏即读到最终右边缘,无需等动画结束。
+function updateLeftPosition() {
+  if (!leftHandle.value) return
+  const sb = document.querySelector('.VPSidebar') as HTMLElement | null
+  if (sb) leftHandle.value.style.left = (sb.offsetLeft + sb.offsetWidth) + 'px'
+}
+
+function injectRightHandle() {
+  const aside = document.querySelector('.VPDoc.has-aside .aside') as HTMLElement | null
+  if (!aside || aside.querySelector('#' + RIGHT_HANDLE_ID)) return
+  const handle = document.createElement('div')
+  handle.id = RIGHT_HANDLE_ID
+  handle.className = 'rs-handle rs-handle--right'
+  handle.setAttribute('role', 'separator')
+  handle.setAttribute('aria-orientation', 'vertical')
+  handle.setAttribute('aria-label', '拖动调整右侧大纲栏宽度(双击重置)')
+  handle.addEventListener('mousedown', (ev) => startDrag('right', ev))
+  handle.addEventListener('dblclick', () => reset('right'))
+  aside.style.position = 'relative'
+  aside.appendChild(handle)
+}
+
+let observer: MutationObserver | null = null
+let leftTimer = 0
+const onMutate = () => {
+  updateLeftVisibility()
+  updateLeftPosition()
+  injectRightHandle()
+}
+
+onMounted(() => {
+  // 恢复已存宽度(防闪脚本已在首屏注入,这里做内存兜底)
+  ;(['left', 'right'] as Side[]).forEach((side) => {
+    const dim = CONF[side]
+    try {
+      const v = parseInt(localStorage.getItem(dim.key) || '')
+      if (v >= dim.min && v <= dim.max) applyVar(side, v)
+    } catch {}
+  })
+  onMutate()
+  // sidebar 桌面端有 transform 入场过渡(translateX(-100%)→0,约 0.25s),过渡中
+  // getBoundingClientRect 偏左,导致 handle 初始错位(拖动后才贴合)。
+  // 多时机补校准,确保首屏即贴合:下一帧 / 过渡结束后(~350ms)/ 页面 load 后。
+  requestAnimationFrame(updateLeftPosition)
+  leftTimer = window.setTimeout(updateLeftPosition, 350)
+  window.addEventListener('resize', updateLeftPosition, { passive: true })
+  if (document.readyState !== 'complete') {
+    window.addEventListener('load', updateLeftPosition)
+  }
+  const root = document.querySelector('.VPContent') || document.body
+  if ('MutationObserver' in window) {
+    observer = new MutationObserver(onMutate)
+    observer.observe(root, { childList: true, subtree: true })
+  }
+})
+
+onBeforeUnmount(() => {
+  observer?.disconnect()
+  observer = null
+  window.clearTimeout(leftTimer)
+  window.removeEventListener('resize', updateLeftPosition)
+  window.removeEventListener('load', updateLeftPosition)
+  document.querySelectorAll('#' + RIGHT_HANDLE_ID).forEach((n) => n.remove())
+  if (drag) {
+    document.removeEventListener('mousemove', drag.onMove)
+    document.removeEventListener('mouseup', drag.onUp)
+    drag = null
+  }
+})
+</script>
+
+<template>
+  <div
+    ref="leftHandle"
+    class="rs-handle rs-handle--left"
+    role="separator"
+    aria-orientation="vertical"
+    aria-label="拖动调整左侧导航栏宽度(双击重置)"
+    @mousedown="startDrag('left', $event)"
+    @dblclick="reset('left')"
+  ></div>
+</template>
diff --git a/site/.vitepress/theme/custom.css b/site/.vitepress/theme/custom.css
index 1ebd59dfc..ac658e1a5 100644
--- a/site/.vitepress/theme/custom.css
+++ b/site/.vitepress/theme/custom.css
@@ -1252,6 +1252,89 @@ html.dark .online-compiler-demo__source-highlight .shiki span {
   font-size: 0.85em;
 }
 
+/* ================================================================
+   Resizable Sidebar(可拖拽侧栏宽度)
+   组件: theme/components/ResizableSidebar.vue
+   左 handle 在组件模板内(fixed),右 handle 运行时注入 .aside(absolute)。
+   宽度由 --vp-sidebar-width(VitePress 原生,全链路消费)与 --vp-aside-width(本站自定义)驱动。
+   ================================================================ */
+
+:root {
+  --vp-aside-width: 256px; /* 右大纲栏宽度变量,默认与 VitePress 原值一致 */
+}
+
+/* 右栏宽度由变量驱动,覆盖 VitePress 的固定 max-width / width */
+.VPDoc.has-aside .aside {
+  max-width: var(--vp-aside-width);
+  position: relative; /* 给注入的 absolute handle 提供锚点 */
+}
+.VPDoc .aside-container {
+  width: calc(var(--vp-aside-width) - 32px); /* 保持原 32px 内边距逻辑(原 max-width 256 → container 224) */
+}
+
+/* 手柄公共态:常显一条 1px 淡灰细线(::before),悬浮 / 拖拽时变品牌色加粗。
+   命中热区 8px(透明本体),避免过窄扫不到。z-index 压在 sidebar 之上,防止被侧栏盖住。 */
+.rs-handle {
+  z-index: calc(var(--vp-z-index-sidebar) + 1);
+  width: 8px;
+  background: transparent;
+  cursor: col-resize;
+}
+.rs-handle::before {
+  content: '';
+  position: absolute;
+  left: 50%;
+  top: 0;
+  bottom: 0;
+  width: 1px;
+  transform: translateX(-50%);
+  background: var(--vp-c-divider);
+  transition: width 0.15s ease, background-color 0.15s ease;
+}
+.rs-handle:hover::before,
+.rs-handle.is-active::before {
+  width: 2px;
+  background: var(--vp-c-brand-1);
+}
+
+/* 左手柄:fixed。left 仅作 SSR 首屏 fallback,onMounted 后由 JS 读取 .VPSidebar 右边缘精确
+   覆盖 —— 宽屏(≥1440px)布局居中,右缘带 (vw-maxW)/2 偏移且受滚动条影响,CSS 公式推算
+   总有小偏差,改读 getBoundingClientRect 根治(与右 handle 同策略)。 */
+.rs-handle--left {
+  position: fixed;
+  left: var(--vp-sidebar-width);
+  margin-left: -4px;
+  top: var(--vp-nav-height, 64px);
+  bottom: 0;
+}
+
+/* 右手柄:absolute 注入 .aside 内,居中压在其左边缘(默认隐藏,仅大屏显示见下方媒体查询) */
+.rs-handle--right {
+  position: absolute;
+  left: -4px;
+  top: 0;
+  bottom: 0;
+  display: none;
+}
+
+/* 拖拽进行中:禁选中文,全屏 col-resize 光标 */
+body.rs-resizing {
+  user-select: none;
+  cursor: col-resize;
+}
+
+/* 响应式:左栏 <960px 沉为抽屉;右栏 aside 仅 ≥1280px 显示 */
+@media (max-width: 959px) {
+  .rs-handle--left {
+    display: none;
+  }
+}
+@media (min-width: 1280px) {
+  .rs-handle--right {
+    display: block;
+  }
+}
+
 /* ================================================================
    Content Page Enhancements
    ================================================================ */
diff --git a/site/.vitepress/theme/index.ts b/site/.vitepress/theme/index.ts
index c3658a2ef..2931fe0f6 100644
--- a/site/.vitepress/theme/index.ts
+++ b/site/.vitepress/theme/index.ts
@@ -14,6 +14,7 @@ import HomeHeroVisual from './components/HomeHeroVisual.vue'
 import ProofStrip from './components/ProofStrip.vue'
 import HomeRoadmap from './components/HomeRoadmap.vue'
 import FontSizeSwitcher from './components/FontSizeSwitcher.vue'
+import ResizableSidebar from './components/ResizableSidebar.vue'
 import { setupMermaid } from './mermaid-client'
 import './custom.css'
 
@@ -21,6 +22,7 @@ export default {
   extends: DefaultTheme,
   Layout() {
     return h(DefaultTheme.Layout, null, {
+      'layout-top': () => h(ResizableSidebar),
       'home-hero-image': () => h(HomeHeroVisual),
       'home-hero-actions-after': () => h('div', { class: 'proof-on-mobile' }, [h(ProofStrip)]),
       'home-hero-after': () => h('div', { class: 'proof-on-desktop' }, [h(ProofStrip)]),