diff --git a/frontend/src/components/FloatingToc/FloatingToc.css b/frontend/src/components/FloatingToc/FloatingToc.css
index 188573f..05b4625 100644
--- a/frontend/src/components/FloatingToc/FloatingToc.css
+++ b/frontend/src/components/FloatingToc/FloatingToc.css
@@ -74,6 +74,18 @@
   transform: translateX(0) scale(1);
 }
 
+.floating-toc.floating-toc-dismissed .floating-toc-tab {
+  opacity: 1;
+  transform: none;
+  pointer-events: auto;
+}
+
+.floating-toc.floating-toc-dismissed .floating-toc-panel {
+  opacity: 0;
+  pointer-events: none;
+  transform: translateX(10px) scale(0.98);
+}
+
 .floating-toc-header {
   min-height: 48px;
   padding: 0 16px;
@@ -167,6 +179,16 @@
   font-size: 13px;
 }
 
+.floating-toc-drawer .ant-drawer-body {
+  padding: 0;
+}
+
+.floating-toc-drawer .floating-toc-content {
+  max-height: none;
+  height: 100%;
+  padding: 10px 8px 12px;
+}
+
 body.dark .floating-toc-tab,
 body.dark .floating-toc-panel {
   box-shadow: 0 22px 48px rgba(0, 0, 0, 0.38);
diff --git a/frontend/src/components/FloatingToc/FloatingToc.jsx b/frontend/src/components/FloatingToc/FloatingToc.jsx
index ea56046..58dd1b5 100644
--- a/frontend/src/components/FloatingToc/FloatingToc.jsx
+++ b/frontend/src/components/FloatingToc/FloatingToc.jsx
@@ -1,15 +1,10 @@
-import { Anchor } from 'antd'
+import { useState } from 'react'
+import { Anchor, Drawer } from 'antd'
 import { FileTextOutlined, MenuOutlined } from '@ant-design/icons'
 import './FloatingToc.css'
 
-export default function FloatingToc({
-  items = [],
-  getContainer,
-  searchKeyword = '',
-  renderTitle,
-  className = '',
-}) {
-  const anchorItems = items.map((item) => ({
+function buildAnchorItems(items, searchKeyword, renderTitle) {
+  return items.map((item) => ({
     key: item.key,
     href: item.href,
     title: (
@@ -21,12 +16,74 @@ export default function FloatingToc({
       </div>
     ),
   }))
+}
+
+function TocContent({ items = [], getContainer, searchKeyword = '', renderTitle, onItemClick }) {
+  const anchorItems = buildAnchorItems(items, searchKeyword, renderTitle)
+
+  return (
+    <div className="floating-toc-content">
+      {items.length > 0 ? (
+        <Anchor
+          affix={false}
+          offsetTop={0}
+          getContainer={getContainer}
+          items={anchorItems}
+          onClick={(e, link) => {
+            window.setTimeout(() => onItemClick?.(link), 120)
+          }}
+        />
+      ) : (
+        <div className="floating-toc-empty">当前文档无标题</div>
+      )}
+    </div>
+  )
+}
+
+export function TocDrawer({
+  open,
+  onClose,
+  items = [],
+  getContainer,
+  searchKeyword = '',
+  renderTitle,
+}) {
+  return (
+    <Drawer
+      title="文档索引"
+      placement="right"
+      onClose={onClose}
+      open={open}
+      width="82%"
+      className="floating-toc-drawer"
+    >
+      <TocContent
+        items={items}
+        getContainer={getContainer}
+        searchKeyword={searchKeyword}
+        renderTitle={renderTitle}
+        onItemClick={onClose}
+      />
+    </Drawer>
+  )
+}
+
+export default function FloatingToc({
+  items = [],
+  getContainer,
+  searchKeyword = '',
+  renderTitle,
+  className = '',
+}) {
+  const [dismissed, setDismissed] = useState(false)
 
   return (
     <aside
-      className={`floating-toc ${className}`.trim()}
+      className={`floating-toc ${dismissed ? 'floating-toc-dismissed' : ''} ${className}`.trim()}
       tabIndex={0}
       aria-label="文档索引"
+      onMouseEnter={() => setDismissed(false)}
+      onFocus={() => setDismissed(false)}
     >
       <div className="floating-toc-tab">
         <MenuOutlined />
@@ -37,18 +94,13 @@ export default function FloatingToc({
           <span>文档索引</span>
           {items.length > 0 && <span className="floating-toc-count">{items.length}</span>}
         </div>
-        <div className="floating-toc-content">
-          {items.length > 0 ? (
-            <Anchor
-              affix={false}
-              offsetTop={0}
-              getContainer={getContainer}
-              items={anchorItems}
-            />
-          ) : (
-            <div className="floating-toc-empty">当前文档无标题</div>
-          )}
-        </div>
+        <TocContent
+          items={items}
+          getContainer={getContainer}
+          searchKeyword={searchKeyword}
+          renderTitle={renderTitle}
+          onItemClick={() => setDismissed(true)}
+        />
       </div>
     </aside>
   )
diff --git a/frontend/src/components/PDFViewer/VirtualPDFViewer.css b/frontend/src/components/PDFViewer/VirtualPDFViewer.css
index 7230ccd..61fec14 100644
--- a/frontend/src/components/PDFViewer/VirtualPDFViewer.css
+++ b/frontend/src/components/PDFViewer/VirtualPDFViewer.css
@@ -30,6 +30,20 @@
   display: inline-block;
 }
 
+.pdf-toolbar-compact .ant-btn {
+  width: 28px;
+  height: 28px;
+  display: inline-flex;
+  align-items: center;
+  justify-content: center;
+  color: var(--text-color-secondary);
+}
+
+.pdf-toolbar-compact .ant-btn:hover {
+  background: var(--item-hover-bg);
+  color: var(--link-color);
+}
+
 .pdf-content {
   flex: 1;
   overflow: auto;
diff --git a/frontend/src/components/PDFViewer/VirtualPDFViewer.jsx b/frontend/src/components/PDFViewer/VirtualPDFViewer.jsx
index 60b1558..9330494 100644
--- a/frontend/src/components/PDFViewer/VirtualPDFViewer.jsx
+++ b/frontend/src/components/PDFViewer/VirtualPDFViewer.jsx
@@ -1,7 +1,7 @@
 import { useState, useMemo, useRef, useEffect, useCallback } from 'react'
 import { createPortal } from 'react-dom'
 import { Document, Page, pdfjs } from 'react-pdf'
-import { Button, Space, InputNumber, message, Spin } from 'antd'
+import { Button, Space, InputNumber, message, Spin, Tooltip } from 'antd'
 import {
     ZoomInOutlined,
     ZoomOutOutlined,
@@ -17,7 +17,7 @@ import './VirtualPDFViewer.css'
 // 配置 PDF.js worker
 pdfjs.GlobalWorkerOptions.workerSrc = '/pdf-worker/pdf.worker.min.mjs'
 
-function VirtualPDFViewer({ url, filename, toolbarTarget }) {
+function VirtualPDFViewer({ url, filename, toolbarTarget, compactToolbar = false }) {
     const [numPages, setNumPages] = useState(null)
     const [scale, setScale] = useState(1.0)
     const [pdfOriginalSize, setPdfOriginalSize] = useState({ width: 595, height: 842 }) // 默认 A4
@@ -160,7 +160,31 @@ function VirtualPDFViewer({ url, filename, toolbarTarget }) {
         document.body.removeChild(link)
     }
 
-    const toolbar = (
+    const toolbar = compactToolbar ? (
+        <div className="pdf-toolbar pdf-toolbar-compact">
+            <Space size={4}>
+                <Tooltip title="回到顶部">
+                    <Button
+                        icon={<VerticalAlignTopOutlined />}
+                        onClick={scrollToTop}
+                        size="small"
+                        type="text"
+                        disabled={currentPage === 1}
+                        aria-label="回到顶部"
+                    />
+                </Tooltip>
+                <Tooltip title="下载PDF">
+                    <Button
+                        icon={<CloudDownloadOutlined />}
+                        onClick={handleDownload}
+                        size="small"
+                        type="text"
+                        aria-label="下载PDF"
+                    />
+                </Tooltip>
+            </Space>
+        </div>
+    ) : (
         <div className="pdf-toolbar">
             <Space>
                 <Button icon={<ZoomOutOutlined />} onClick={zoomOut} size="small">
diff --git a/frontend/src/pages/Document/DocumentEditor.css b/frontend/src/pages/Document/DocumentEditor.css
index df66b10..6ebef86 100644
--- a/frontend/src/pages/Document/DocumentEditor.css
+++ b/frontend/src/pages/Document/DocumentEditor.css
@@ -283,8 +283,7 @@
   background-color: var(--item-hover-bg);
 }
 
-/* The fixed editor layout does not use Bytemd's built-in sidebar modes. */
-.bytemd-toolbar-right .bytemd-toolbar-icon:nth-child(1),
+/* Keep the TOC entry visible; hide the help sidebar button. */
 .bytemd-toolbar-right .bytemd-toolbar-icon:nth-child(2) {
   display: none;
 }
diff --git a/frontend/src/pages/Preview/FileSharePage.jsx b/frontend/src/pages/Preview/FileSharePage.jsx
index 38c8e9d..55f4d37 100644
--- a/frontend/src/pages/Preview/FileSharePage.jsx
+++ b/frontend/src/pages/Preview/FileSharePage.jsx
@@ -1,7 +1,7 @@
 import { useState, useEffect, useRef } from 'react'
 import { useNavigate, useParams } from 'react-router-dom'
-import { Layout, Modal, Input, Spin, Button, Space } from 'antd'
-import { CloseOutlined, LockOutlined, FileTextOutlined, FilePdfOutlined, VerticalAlignTopOutlined, CloudDownloadOutlined } from '@ant-design/icons'
+import { Layout, Modal, Input, Spin, Button, Space, Tooltip } from 'antd'
+import { CloseOutlined, LockOutlined, FileTextOutlined, FilePdfOutlined, VerticalAlignTopOutlined, CloudDownloadOutlined, MenuOutlined } from '@ant-design/icons'
 import ReactMarkdown from 'react-markdown'
 import remarkGfm from 'remark-gfm'
 import rehypeHighlight from 'rehype-highlight'
@@ -9,7 +9,7 @@ import rehypeSlug from 'rehype-slug'
 import 'highlight.js/styles/github.css'
 import GithubSlugger from 'github-slugger'
 import Toast from '@/components/Toast/Toast'
-import FloatingToc from '@/components/FloatingToc/FloatingToc'
+import FloatingToc, { TocDrawer } from '@/components/FloatingToc/FloatingToc'
 import VirtualPDFViewer from '@/components/PDFViewer/VirtualPDFViewer'
 import {
   getFileSharePublicInfo,
@@ -31,6 +31,7 @@ function FileSharePage() {
   const [loading, setLoading] = useState(true)
   const [isMobile, setIsMobile] = useState(false)
   const [tocItems, setTocItems] = useState([])
+  const [tocDrawerVisible, setTocDrawerVisible] = useState(false)
   const [passwordModalVisible, setPasswordModalVisible] = useState(false)
   const [password, setPassword] = useState('')
 
@@ -181,22 +182,54 @@ function FileSharePage() {
                 <span className="preview-header-text">{headerLabel}</span>
               </h3>
               {contentInfo?.type === 'markdown' && (
-                <Space className="preview-header-actions">
-                  <Button
-                    icon={<VerticalAlignTopOutlined />}
-                    onClick={scrollContentToTop}
-                    size="small"
-                  >
-                    回到顶部
-                  </Button>
-                  <Button
-                    icon={<CloudDownloadOutlined />}
-                    onClick={handleExportPDF}
-                    size="small"
-                  >
-                    下载PDF
-                  </Button>
-                </Space>
+                isMobile ? (
+                  <Space className="preview-header-actions preview-compact-actions" size={4}>
+                    <Tooltip title="回到顶部">
+                      <Button
+                        icon={<VerticalAlignTopOutlined />}
+                        onClick={scrollContentToTop}
+                        size="small"
+                        type="text"
+                        aria-label="回到顶部"
+                      />
+                    </Tooltip>
+                    <Tooltip title="下载PDF">
+                      <Button
+                        icon={<CloudDownloadOutlined />}
+                        onClick={handleExportPDF}
+                        size="small"
+                        type="text"
+                        aria-label="下载PDF"
+                      />
+                    </Tooltip>
+                    <Tooltip title="文档索引">
+                      <Button
+                        icon={<MenuOutlined />}
+                        onClick={() => setTocDrawerVisible(true)}
+                        size="small"
+                        type="text"
+                        aria-label="文档索引"
+                      />
+                    </Tooltip>
+                  </Space>
+                ) : (
+                  <Space className="preview-header-actions">
+                    <Button
+                      icon={<VerticalAlignTopOutlined />}
+                      onClick={scrollContentToTop}
+                      size="small"
+                    >
+                      回到顶部
+                    </Button>
+                    <Button
+                      icon={<CloudDownloadOutlined />}
+                      onClick={handleExportPDF}
+                      size="small"
+                    >
+                      下载PDF
+                    </Button>
+                  </Space>
+                )
               )}
               {contentInfo?.type === 'pdf' && <div className="preview-header-actions pdf-header-toolbar" ref={setPdfToolbarTarget} />}
             </div>
@@ -213,6 +246,7 @@ function FileSharePage() {
                     url={contentInfo.document_url}
                     filename={contentInfo.filename}
                     toolbarTarget={pdfToolbarTarget}
+                    compactToolbar={isMobile}
                   />
                 ) : (
                   <div className="markdown-body">
@@ -239,6 +273,13 @@ function FileSharePage() {
         </Layout>
       </div>
 
+      <TocDrawer
+        open={tocDrawerVisible}
+        onClose={() => setTocDrawerVisible(false)}
+        items={tocItems}
+        getContainer={() => contentRef.current}
+      />
+
       <Modal
         title={<div style={{ display: 'flex', alignItems: 'center', gap: 8 }}><LockOutlined /><span>访问验证</span></div>}
         open={passwordModalVisible}
diff --git a/frontend/src/pages/Preview/PreviewPage.css b/frontend/src/pages/Preview/PreviewPage.css
index 165b717..4c37db0 100644
--- a/frontend/src/pages/Preview/PreviewPage.css
+++ b/frontend/src/pages/Preview/PreviewPage.css
@@ -170,6 +170,29 @@
   gap: 16px;
 }
 
+.preview-header-leading-actions {
+  display: inline-flex;
+  align-items: center;
+  gap: 4px;
+  flex: none;
+}
+
+.preview-header-leading-actions .ant-btn,
+.preview-compact-actions .ant-btn {
+  width: 28px;
+  height: 28px;
+  display: inline-flex;
+  align-items: center;
+  justify-content: center;
+  color: var(--text-color-secondary);
+}
+
+.preview-header-leading-actions .ant-btn:hover,
+.preview-compact-actions .ant-btn:hover {
+  background: var(--item-hover-bg);
+  color: var(--link-color);
+}
+
 .preview-header-title {
   display: flex;
   align-items: center;
@@ -365,31 +388,23 @@
   margin-bottom: 4px;
 }
 
-/* 移动端菜单按钮 */
-.mobile-menu-btn {
-  position: fixed;
-  top: 16px;
-  left: 16px;
-  z-index: 1000;
-  box-shadow: 0 2px 8px rgba(0, 0, 0, 0.15);
-}
-
-.mobile-close-btn {
-  position: fixed;
-  top: 16px;
-  right: 16px;
-  z-index: 1000;
-  background: var(--header-bg);
-  border: 1px solid var(--border-color);
-  border-radius: 999px;
-  box-shadow: 0 2px 8px rgba(0, 0, 0, 0.15);
-}
-
 /* 移动端响应式样式 */
 @media (max-width: 768px) {
+  .preview-content-header {
+    padding: 12px 12px;
+    gap: 8px;
+  }
+
+  .file-share-content-header {
+    gap: 8px;
+  }
+
   .preview-content-wrapper {
     padding: 16px;
-    padding-top: 60px; /* 为移动端菜单按钮留出空间 */
+  }
+
+  .preview-content-wrapper.pdf-mode {
+    padding: 0;
   }
 
   .markdown-body {
@@ -444,6 +459,10 @@
     padding: 12px;
   }
 
+  .preview-content-wrapper.pdf-mode {
+    padding: 0;
+  }
+
   .markdown-body {
     font-size: 14px;
   }
diff --git a/frontend/src/pages/Preview/ProjectSharePage.jsx b/frontend/src/pages/Preview/ProjectSharePage.jsx
index 08ced1e..8f9d0d4 100644
--- a/frontend/src/pages/Preview/ProjectSharePage.jsx
+++ b/frontend/src/pages/Preview/ProjectSharePage.jsx
@@ -1,7 +1,7 @@
 import { useState, useEffect, useRef, useMemo } from 'react'
 import { useParams, useSearchParams, useNavigate } from 'react-router-dom'
 import { Layout, Menu, Spin, Button, Modal, Input, Drawer, Empty, Tooltip, Space } from 'antd'
-import { FileTextOutlined, FolderOutlined, FolderOpenOutlined, FilePdfOutlined, LockOutlined, MenuOutlined, CloseOutlined, VerticalAlignTopOutlined, CloudDownloadOutlined } from '@ant-design/icons'
+import { FileTextOutlined, FolderOutlined, FolderOpenOutlined, FilePdfOutlined, LockOutlined, MenuOutlined, CloseOutlined, VerticalAlignTopOutlined, CloudDownloadOutlined, UnorderedListOutlined } from '@ant-design/icons'
 import ReactMarkdown from 'react-markdown'
 import remarkGfm from 'remark-gfm'
 import rehypeHighlight from 'rehype-highlight'
@@ -11,7 +11,7 @@ import Mark from 'mark.js'
 import Highlighter from 'react-highlight-words'
 import GithubSlugger from 'github-slugger'
 import Toast from '@/components/Toast/Toast'
-import FloatingToc from '@/components/FloatingToc/FloatingToc'
+import FloatingToc, { TocDrawer } from '@/components/FloatingToc/FloatingToc'
 import VirtualPDFViewer from '@/components/PDFViewer/VirtualPDFViewer'
 import {
   getProjectSharePublicInfo,
@@ -54,6 +54,7 @@ function ProjectSharePage() {
   const [password, setPassword] = useState('')
   const [siderCollapsed, setSiderCollapsed] = useState(false)
   const [mobileDrawerVisible, setMobileDrawerVisible] = useState(false)
+  const [tocDrawerVisible, setTocDrawerVisible] = useState(false)
   const [isMobile, setIsMobile] = useState(false)
   const [pdfUrl, setPdfUrl] = useState('')
   const [pdfFilename, setPdfFilename] = useState('')
@@ -418,20 +419,6 @@ function ProjectSharePage() {
       <Layout className="preview-layout">
         {isMobile ? (
           <>
-            <Button
-              type="text"
-              icon={<CloseOutlined />}
-              className="mobile-close-btn"
-              onClick={handleClose}
-            />
-            <Button
-              type="primary"
-              icon={<MenuOutlined />}
-              className="mobile-menu-btn"
-              onClick={() => setMobileDrawerVisible(true)}
-            >
-              目录索引
-            </Button>
             <Drawer
               title={projectInfo?.name || '项目分享'}
               placement="left"
@@ -457,7 +444,10 @@ function ProjectSharePage() {
                   openKeys={openKeys}
                   onOpenChange={setOpenKeys}
                   items={menuItems}
-                  onClick={({ key }) => openSharedFile(key)}
+                  onClick={({ key }) => {
+                    openSharedFile(key)
+                    setMobileDrawerVisible(false)
+                  }}
                   className="preview-menu"
                 />
               ) : (
@@ -512,27 +502,81 @@ function ProjectSharePage() {
         <Layout className="preview-content-layout">
           <Content className="preview-content" ref={contentRef}>
             <div className="preview-content-header">
+              {isMobile && (
+                <div className="preview-header-leading-actions">
+                  <Tooltip title="关闭">
+                    <Button
+                      type="text"
+                      icon={<CloseOutlined />}
+                      onClick={handleClose}
+                      size="small"
+                      aria-label="关闭项目分享"
+                    />
+                  </Tooltip>
+                  <Tooltip title="目录索引">
+                    <Button
+                      type="text"
+                      icon={<UnorderedListOutlined />}
+                      onClick={() => setMobileDrawerVisible(true)}
+                      size="small"
+                      aria-label="目录索引"
+                    />
+                  </Tooltip>
+                </div>
+              )}
               <h3 className="preview-header-title">
                 <HeaderIcon className="preview-header-icon" style={isHeaderPdf ? { color: '#f5222d' } : undefined} />
                 <span className="preview-header-text">{headerLabel}</span>
               </h3>
               {viewMode === 'markdown' && (
-                <Space className="preview-header-actions">
-                  <Button
-                    icon={<VerticalAlignTopOutlined />}
-                    onClick={scrollContentToTop}
-                    size="small"
-                  >
-                    回到顶部
-                  </Button>
-                  <Button
-                    icon={<CloudDownloadOutlined />}
-                    onClick={handleExportPDF}
-                    size="small"
-                  >
-                    下载PDF
-                  </Button>
-                </Space>
+                isMobile ? (
+                  <Space className="preview-header-actions preview-compact-actions" size={4}>
+                    <Tooltip title="回到顶部">
+                      <Button
+                        icon={<VerticalAlignTopOutlined />}
+                        onClick={scrollContentToTop}
+                        size="small"
+                        type="text"
+                        aria-label="回到顶部"
+                      />
+                    </Tooltip>
+                    <Tooltip title="下载PDF">
+                      <Button
+                        icon={<CloudDownloadOutlined />}
+                        onClick={handleExportPDF}
+                        size="small"
+                        type="text"
+                        aria-label="下载PDF"
+                      />
+                    </Tooltip>
+                    <Tooltip title="文档索引">
+                      <Button
+                        icon={<MenuOutlined />}
+                        onClick={() => setTocDrawerVisible(true)}
+                        size="small"
+                        type="text"
+                        aria-label="文档索引"
+                      />
+                    </Tooltip>
+                  </Space>
+                ) : (
+                  <Space className="preview-header-actions">
+                    <Button
+                      icon={<VerticalAlignTopOutlined />}
+                      onClick={scrollContentToTop}
+                      size="small"
+                    >
+                      回到顶部
+                    </Button>
+                    <Button
+                      icon={<CloudDownloadOutlined />}
+                      onClick={handleExportPDF}
+                      size="small"
+                    >
+                      下载PDF
+                    </Button>
+                  </Space>
+                )
               )}
               {viewMode === 'pdf' && <div className="preview-header-actions pdf-header-toolbar" ref={setPdfToolbarTarget} />}
             </div>
@@ -544,7 +588,7 @@ function ProjectSharePage() {
                   </Spin>
                 </div>
               ) : viewMode === 'pdf' ? (
-                <VirtualPDFViewer url={pdfUrl} filename={pdfFilename} toolbarTarget={pdfToolbarTarget} />
+                <VirtualPDFViewer url={pdfUrl} filename={pdfFilename} toolbarTarget={pdfToolbarTarget} compactToolbar={isMobile} />
               ) : (
                 <div className="markdown-body" onClick={(e) => {
                   if (e.defaultPrevented) return
@@ -578,6 +622,15 @@ function ProjectSharePage() {
         </Layout>
       </Layout>
 
+      <TocDrawer
+        open={tocDrawerVisible}
+        onClose={() => setTocDrawerVisible(false)}
+        items={tocItems}
+        searchKeyword={searchKeyword}
+        getContainer={() => contentRef.current}
+        renderTitle={(item, keyword) => <HighlightText text={item.title} keyword={keyword} />}
+      />
+
       <Modal
         title={<div style={{ display: 'flex', alignItems: 'center', gap: 8 }}><LockOutlined /><span>访问验证</span></div>}
         open={passwordModalVisible}