diff --git a/frontend/src/components/FloatingToc/FloatingToc.css b/frontend/src/components/FloatingToc/FloatingToc.css
new file mode 100644
index 0000000..188573f
--- /dev/null
+++ b/frontend/src/components/FloatingToc/FloatingToc.css
@@ -0,0 +1,189 @@
+.floating-toc {
+  position: fixed;
+  top: 50%;
+  right: 24px;
+  z-index: 30;
+  width: 48px;
+  height: 180px;
+  transform: translateY(-50%);
+  outline: none;
+}
+
+.floating-toc-tab {
+  position: absolute;
+  top: 0;
+  right: 0;
+  width: 48px;
+  height: 180px;
+  border: 1px solid color-mix(in srgb, var(--border-color) 82%, var(--text-color-secondary));
+  border-radius: 8px;
+  background: color-mix(in srgb, var(--card-bg) 92%, transparent);
+  color: var(--text-color-secondary);
+  box-shadow: 0 12px 30px rgba(15, 23, 42, 0.12);
+  backdrop-filter: blur(12px);
+  display: flex;
+  flex-direction: column;
+  align-items: center;
+  justify-content: center;
+  gap: 10px;
+  cursor: default;
+  transition: opacity 0.18s ease, transform 0.18s ease, border-color 0.18s ease, color 0.18s ease;
+}
+
+.floating-toc-tab span {
+  writing-mode: vertical-rl;
+  text-orientation: mixed;
+  font-size: 12px;
+  line-height: 1;
+  letter-spacing: 0;
+  white-space: nowrap;
+}
+
+.floating-toc-panel {
+  position: absolute;
+  top: 0;
+  right: 0;
+  width: min(420px, calc(100vw - 320px));
+  min-width: 300px;
+  max-height: min(58vh, 460px);
+  border: 1px solid color-mix(in srgb, var(--border-color) 78%, var(--text-color-secondary));
+  border-radius: 8px;
+  background: color-mix(in srgb, var(--card-bg) 96%, transparent);
+  color: var(--text-color);
+  box-shadow: 0 22px 48px rgba(15, 23, 42, 0.18);
+  backdrop-filter: blur(16px);
+  opacity: 0;
+  pointer-events: none;
+  transform: translateX(10px) scale(0.98);
+  transform-origin: top right;
+  overflow: hidden;
+  transition: opacity 0.18s ease, transform 0.18s ease;
+}
+
+.floating-toc:hover .floating-toc-tab,
+.floating-toc:focus-within .floating-toc-tab {
+  opacity: 0;
+  transform: translateX(8px) scale(0.96);
+  pointer-events: none;
+}
+
+.floating-toc:hover .floating-toc-panel,
+.floating-toc:focus-within .floating-toc-panel {
+  opacity: 1;
+  pointer-events: auto;
+  transform: translateX(0) scale(1);
+}
+
+.floating-toc-header {
+  min-height: 48px;
+  padding: 0 16px;
+  border-bottom: 1px solid var(--border-color);
+  display: flex;
+  align-items: center;
+  justify-content: space-between;
+  gap: 12px;
+  color: var(--text-color);
+  font-size: 14px;
+  font-weight: 600;
+}
+
+.floating-toc-count {
+  min-width: 34px;
+  height: 22px;
+  padding: 0 8px;
+  border-radius: 999px;
+  background: var(--item-hover-bg);
+  color: var(--text-color-secondary);
+  font-size: 12px;
+  font-weight: 600;
+  line-height: 22px;
+  text-align: center;
+}
+
+.floating-toc-content {
+  max-height: calc(min(58vh, 460px) - 49px);
+  overflow-y: auto;
+  overflow-x: hidden;
+  padding: 10px 8px 12px;
+}
+
+.floating-toc-content .ant-anchor {
+  padding-left: 0;
+}
+
+.floating-toc-content .ant-anchor::before {
+  display: none;
+}
+
+.floating-toc-content .ant-anchor-ink {
+  display: none;
+}
+
+.floating-toc-content .ant-anchor-link {
+  padding: 2px 0;
+}
+
+.floating-toc-content .ant-anchor-link-title {
+  border-radius: 6px;
+  color: var(--text-color-secondary);
+  line-height: 1.45;
+  transition: background 0.16s ease, color 0.16s ease;
+}
+
+.floating-toc-content .ant-anchor-link-title:hover,
+.floating-toc-content .ant-anchor-link-active > .ant-anchor-link-title {
+  background: var(--item-hover-bg);
+  color: var(--link-color);
+}
+
+.floating-toc-item {
+  min-height: 34px;
+  padding: 7px 8px;
+  display: flex;
+  align-items: center;
+  gap: 8px;
+  min-width: 0;
+}
+
+.floating-toc-item-icon {
+  flex: none;
+  font-size: 12px;
+  color: currentColor;
+  opacity: 0.72;
+}
+
+.floating-toc-item-title {
+  min-width: 0;
+  overflow: hidden;
+  text-overflow: ellipsis;
+  white-space: nowrap;
+  font-size: 13px;
+}
+
+.floating-toc-empty {
+  padding: 28px 12px;
+  color: var(--text-color-secondary);
+  text-align: center;
+  font-size: 13px;
+}
+
+body.dark .floating-toc-tab,
+body.dark .floating-toc-panel {
+  box-shadow: 0 22px 48px rgba(0, 0, 0, 0.38);
+}
+
+@media (max-width: 1024px) {
+  .floating-toc {
+    right: 16px;
+  }
+
+  .floating-toc-panel {
+    width: min(360px, calc(100vw - 300px));
+  }
+}
+
+@media (max-width: 768px) {
+  .floating-toc {
+    display: none;
+  }
+}
diff --git a/frontend/src/components/FloatingToc/FloatingToc.jsx b/frontend/src/components/FloatingToc/FloatingToc.jsx
new file mode 100644
index 0000000..ea56046
--- /dev/null
+++ b/frontend/src/components/FloatingToc/FloatingToc.jsx
@@ -0,0 +1,55 @@
+import { Anchor } 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) => ({
+    key: item.key,
+    href: item.href,
+    title: (
+      <div className="floating-toc-item" style={{ paddingLeft: `${(item.level - 1) * 12}px` }}>
+        <FileTextOutlined className="floating-toc-item-icon" />
+        <span className="floating-toc-item-title">
+          {renderTitle ? renderTitle(item, searchKeyword) : item.title}
+        </span>
+      </div>
+    ),
+  }))
+
+  return (
+    <aside
+      className={`floating-toc ${className}`.trim()}
+      tabIndex={0}
+      aria-label="文档索引"
+    >
+      <div className="floating-toc-tab">
+        <MenuOutlined />
+        <span>文档索引</span>
+      </div>
+      <div className="floating-toc-panel">
+        <div className="floating-toc-header">
+          <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>
+      </div>
+    </aside>
+  )
+}
diff --git a/frontend/src/components/PDFViewer/VirtualPDFViewer.css b/frontend/src/components/PDFViewer/VirtualPDFViewer.css
index e95ef79..7230ccd 100644
--- a/frontend/src/components/PDFViewer/VirtualPDFViewer.css
+++ b/frontend/src/components/PDFViewer/VirtualPDFViewer.css
@@ -7,22 +7,42 @@
 
 .pdf-toolbar {
   display: flex;
-  justify-content: space-between;
+  justify-content: flex-end;
   align-items: center;
-  padding: 12px 16px;
-  background: var(--card-bg);
-  border-bottom: 1px solid var(--border-color);
-  box-shadow: 0 2px 4px rgba(0, 0, 0, 0.05);
+  gap: 16px;
+  min-width: 0;
+  background: transparent;
   z-index: 10;
   color: var(--text-color);
 }
 
+.pdf-toolbar-scale {
+  min-width: 50px;
+  text-align: center;
+  color: var(--text-color);
+  font-size: 13px;
+}
+
+.pdf-toolbar-divider {
+  width: 1px;
+  height: 18px;
+  background: var(--border-color);
+  display: inline-block;
+}
+
 .pdf-content {
   flex: 1;
   overflow: auto;
   position: relative;
 }
 
+.virtual-pdf-viewer-container > .pdf-toolbar {
+  padding: 12px 16px;
+  background: var(--card-bg);
+  border-bottom: 1px solid var(--border-color);
+  box-shadow: 0 2px 4px rgba(0, 0, 0, 0.05);
+}
+
 .pdf-virtual-list {
   background: var(--bg-color-secondary);
 }
@@ -129,4 +149,4 @@
 .react-pdf__Document {
   height: 100%;
   width: 100%;
-}
\ No newline at end of file
+}
diff --git a/frontend/src/components/PDFViewer/VirtualPDFViewer.jsx b/frontend/src/components/PDFViewer/VirtualPDFViewer.jsx
index 5e3ed62..60b1558 100644
--- a/frontend/src/components/PDFViewer/VirtualPDFViewer.jsx
+++ b/frontend/src/components/PDFViewer/VirtualPDFViewer.jsx
@@ -1,4 +1,5 @@
 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 {
@@ -16,7 +17,7 @@ import './VirtualPDFViewer.css'
 // 配置 PDF.js worker
 pdfjs.GlobalWorkerOptions.workerSrc = '/pdf-worker/pdf.worker.min.mjs'
 
-function VirtualPDFViewer({ url, filename }) {
+function VirtualPDFViewer({ url, filename, toolbarTarget }) {
     const [numPages, setNumPages] = useState(null)
     const [scale, setScale] = useState(1.0)
     const [pdfOriginalSize, setPdfOriginalSize] = useState({ width: 595, height: 842 }) // 默认 A4
@@ -159,65 +160,66 @@ function VirtualPDFViewer({ url, filename }) {
         document.body.removeChild(link)
     }
 
+    const toolbar = (
+        <div className="pdf-toolbar">
+            <Space>
+                <Button icon={<ZoomOutOutlined />} onClick={zoomOut} size="small">
+                    缩小
+                </Button>
+                <span className="pdf-toolbar-scale">
+                    {Math.round(scale * 100)}%
+                </span>
+                <Button icon={<ZoomInOutlined />} onClick={zoomIn} size="small">
+                    放大
+                </Button>
+                <Button
+                    icon={<LeftOutlined />}
+                    onClick={() => handlePageChange(currentPage - 1)}
+                    disabled={currentPage <= 1}
+                    size="small"
+                />
+                <Space.Compact>
+                    <InputNumber
+                        min={1}
+                        max={numPages || 1}
+                        value={currentPage}
+                        onChange={handlePageChange}
+                        size="small"
+                        style={{ width: 60 }}
+                    />
+                    <Button size="small" disabled>
+                        / {numPages || 0}
+                    </Button>
+                </Space.Compact>
+                <Button
+                    icon={<RightOutlined />}
+                    onClick={() => handlePageChange(currentPage + 1)}
+                    disabled={currentPage >= (numPages || 0)}
+                    size="small"
+                />
+                <span className="pdf-toolbar-divider" />
+                <Button
+                    icon={<VerticalAlignTopOutlined />}
+                    onClick={scrollToTop}
+                    size="small"
+                    disabled={currentPage === 1}
+                >
+                    回到顶部
+                </Button>
+                <Button
+                    icon={<CloudDownloadOutlined />}
+                    onClick={handleDownload}
+                    size="small"
+                >
+                    下载PDF
+                </Button>
+            </Space>
+        </div>
+    )
+
     return (
         <div className="virtual-pdf-viewer-container">
-            {/* 工具栏 */}
-            <div className="pdf-toolbar">
-                <Space>
-                    <Button
-                        icon={<LeftOutlined />}
-                        onClick={() => handlePageChange(currentPage - 1)}
-                        disabled={currentPage <= 1}
-                        size="small"
-                    />
-                    <Space.Compact>
-                        <InputNumber
-                            min={1}
-                            max={numPages || 1}
-                            value={currentPage}
-                            onChange={handlePageChange}
-                            size="small"
-                            style={{ width: 60 }}
-                        />
-                        <Button size="small" disabled>
-                            / {numPages || 0}
-                        </Button>
-                    </Space.Compact>
-                    <Button
-                        icon={<RightOutlined />}
-                        onClick={() => handlePageChange(currentPage + 1)}
-                        disabled={currentPage >= (numPages || 0)}
-                        size="small"
-                    />
-                    <Button
-                        icon={<VerticalAlignTopOutlined />}
-                        onClick={scrollToTop}
-                        size="small"
-                        disabled={currentPage === 1}
-                    >
-                        回到顶部
-                    </Button>
-                    <Button
-                        icon={<CloudDownloadOutlined />}
-                        onClick={handleDownload}
-                        size="small"
-                    >
-                        下载PDF
-                    </Button>
-                </Space>
-
-                <Space>
-                    <Button icon={<ZoomOutOutlined />} onClick={zoomOut} size="small">
-                        缩小
-                    </Button>
-                    <span style={{ minWidth: 50, textAlign: 'center' }}>
-                        {Math.round(scale * 100)}%
-                    </span>
-                    <Button icon={<ZoomInOutlined />} onClick={zoomIn} size="small">
-                        放大
-                    </Button>
-                </Space>
-            </div>
+            {toolbarTarget ? createPortal(toolbar, toolbarTarget) : toolbar}
 
             {/* PDF内容区 - 自定义虚拟滚动 */}
             <div className="pdf-content" ref={containerRef}>
diff --git a/frontend/src/pages/Document/DocumentEditor.css b/frontend/src/pages/Document/DocumentEditor.css
index de17308..df66b10 100644
--- a/frontend/src/pages/Document/DocumentEditor.css
+++ b/frontend/src/pages/Document/DocumentEditor.css
@@ -283,6 +283,12 @@
   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),
+.bytemd-toolbar-right .bytemd-toolbar-icon:nth-child(2) {
+  display: none;
+}
+
 /* 编辑和预览区域容器 */
 .bytemd-body {
   flex: 1 !important;
@@ -297,15 +303,10 @@
   background-color: var(--bg-color);
 }
 
-/* 编辑区域 - 固定50%宽度 */
+/* 编辑区域 - 默认分栏，保留 Bytemd 内联样式对仅编辑/仅预览的控制 */
 .bytemd-editor {
-  width: 50% !important;
-  flex: 0 0 50% !important;
-  display: flex !important;
-  flex-direction: column !important;
   overflow: hidden;
   min-height: 0;
-  max-width: 50% !important;
   box-sizing: border-box;
   /* Added for consistent box model */
   min-width: 0;
@@ -314,16 +315,13 @@
   border-right: 1px solid var(--border-color);
 }
 
-/* 预览区域 - 固定50%宽度 */
+/* 预览区域 - 默认分栏，保留 Bytemd 内联样式对仅编辑/仅预览的控制 */
 .bytemd-preview {
-  width: 50% !important;
-  flex: 0 0 50% !important;
   overflow-y: auto !important;
   overflow-x: hidden !important;
   padding: 16px;
   font-size: 14px;
   line-height: 1.8;
-  max-width: 50% !important;
   box-sizing: border-box;
   /* Added for consistent box model */
   min-width: 0;
diff --git a/frontend/src/pages/Document/DocumentPage.css b/frontend/src/pages/Document/DocumentPage.css
index f586fbe..257db55 100644
--- a/frontend/src/pages/Document/DocumentPage.css
+++ b/frontend/src/pages/Document/DocumentPage.css
@@ -169,86 +169,6 @@
   background: var(--bg-color);
 }
 
-.docs-toc-sider {
-  border-left: 1px solid var(--border-color);
-  background: var(--bg-color-secondary) !important;
-  height: 100%;
-  overflow: hidden;
-  display: flex;
-  flex-direction: column;
-}
-
-.docs-toc-sider .ant-layout-sider-children {
-  display: flex;
-  flex-direction: column;
-  height: 100%;
-  min-height: 0;
-}
-
-.toc-header {
-  padding: 16px;
-  border-bottom: 1px solid var(--border-color);
-  display: flex;
-  justify-content: space-between;
-  align-items: center;
-  background: var(--header-bg);
-}
-
-.toc-header h3 {
-  margin: 0;
-  font-size: 14px;
-  font-weight: 600;
-  color: var(--text-color);
-}
-
-.toc-content {
-  flex: 1;
-  min-height: 0;
-  overflow-y: auto;
-  overflow-x: auto;
-  padding: 16px;
-}
-
-.toc-content .ant-anchor {
-  display: block;
-  min-height: max-content;
-  padding-left: 0;
-  padding-bottom: 65px;
-  /* 给Anchor组件添加底部内边距，避免最后一项被遮挡 */
-}
-
-.toc-content .ant-anchor-link {
-  padding: 6px 0;
-}
-
-.toc-content .ant-anchor-link-title {
-  font-size: 13px;
-  color: var(--text-color-secondary);
-  line-height: 1.5;
-  white-space: nowrap;
-}
-
-.toc-content .ant-anchor-link-active>.ant-anchor-link-title {
-  color: var(--link-color);
-  font-weight: 500;
-}
-
-.toc-empty {
-  color: var(--text-color-secondary);
-  text-align: center;
-  margin-top: 40px;
-  font-size: 13px;
-}
-
-.toc-toggle-btn {
-  position: fixed;
-  right: 24px;
-  top: 50%;
-  transform: translateY(-50%);
-  z-index: 100;
-  box-shadow: 0 2px 8px rgba(0, 0, 0, 0.15);
-}
-
 .docs-content {
   height: 100%;
   overflow-y: auto;
@@ -265,13 +185,15 @@
   background: var(--header-bg);
   display: flex;
   align-items: center;
+  justify-content: space-between;
+  gap: 16px;
 }
 
 .docs-header-title {
   display: flex;
   align-items: center;
   min-width: 0;
-  max-width: 100%;
+  flex: 1;
   overflow: hidden;
   white-space: nowrap;
   gap: 0;
@@ -301,6 +223,20 @@
   white-space: nowrap;
 }
 
+.docs-header-actions {
+  flex: none;
+}
+
+.pdf-header-toolbar {
+  min-width: 0;
+  overflow-x: auto;
+  overflow-y: hidden;
+}
+
+.pdf-header-toolbar .pdf-toolbar {
+  white-space: nowrap;
+}
+
 .docs-content-wrapper {
   max-width: 900px;
   margin: 0 auto;
diff --git a/frontend/src/pages/Document/DocumentPage.jsx b/frontend/src/pages/Document/DocumentPage.jsx
index 36ca8bf..2e37434 100644
--- a/frontend/src/pages/Document/DocumentPage.jsx
+++ b/frontend/src/pages/Document/DocumentPage.jsx
@@ -1,7 +1,7 @@
 import { useState, useEffect, useRef, useMemo } from 'react'
 import { useParams, useNavigate, useSearchParams } from 'react-router-dom'
-import { Layout, Menu, Spin, FloatButton, Button, Tooltip, message, Anchor, Modal, Input, Space, Dropdown, Empty, Switch } from 'antd'
-import { VerticalAlignTopOutlined, ShareAltOutlined, MenuFoldOutlined, MenuUnfoldOutlined, FileTextOutlined, FolderOutlined, FolderOpenOutlined, FilePdfOutlined, CopyOutlined, LockOutlined, CloudDownloadOutlined, CloudUploadOutlined, DownOutlined, SearchOutlined, ArrowLeftOutlined, MenuOutlined, ReloadOutlined } from '@ant-design/icons'
+import { Layout, Menu, Spin, Button, Tooltip, message, Modal, Input, Space, Dropdown, Empty, Switch } from 'antd'
+import { ShareAltOutlined, FileTextOutlined, FolderOutlined, FolderOpenOutlined, FilePdfOutlined, CopyOutlined, LockOutlined, CloudDownloadOutlined, CloudUploadOutlined, DownOutlined, ArrowLeftOutlined, ReloadOutlined, VerticalAlignTopOutlined } from '@ant-design/icons'
 import ReactMarkdown from 'react-markdown'
 import remarkGfm from 'remark-gfm'
 import rehypeRaw from 'rehype-raw'
@@ -15,7 +15,7 @@ import { gitPull, gitPush, getGitRepos } from '@/api/project'
 import { getFileShareInfo, createOrUpdateFileShare, deleteFileShare } from '@/api/share'
 import { searchDocuments } from '@/api/search'
 import VirtualPDFViewer from '@/components/PDFViewer/VirtualPDFViewer'
-import DocFloatActions from '@/components/DocFloatActions/DocFloatActions'
+import FloatingToc from '@/components/FloatingToc/FloatingToc'
 import Toast from '@/components/Toast/Toast'
 import ModeSwitch from '@/components/ModeSwitch/ModeSwitch'
 import './DocumentPage.css'
@@ -45,7 +45,6 @@ function DocumentPage() {
   const [markdownContent, setMarkdownContent] = useState('')
   const [loading, setLoading] = useState(false)
   const [openKeys, setOpenKeys] = useState([])
-  const [tocCollapsed, setTocCollapsed] = useState(false)
   const [tocItems, setTocItems] = useState([])
   const [shareModalVisible, setShareModalVisible] = useState(false)
   const [shareInfo, setShareInfo] = useState(null)
@@ -68,6 +67,7 @@ function DocumentPage() {
   
   const contentRef = useRef(null)
   const modeSwitchingRef = useRef(false)
+  const [pdfToolbarTarget, setPdfToolbarTarget] = useState(null)
 
   const getHeaderDisplay = (filePath) => {
     const resolvedPath = filePath || 'README.md'
@@ -414,6 +414,22 @@ function DocumentPage() {
     }
   }
 
+  const scrollContentToTop = () => {
+    if (contentRef.current) {
+      contentRef.current.scrollTo({ top: 0, behavior: 'smooth' })
+    }
+  }
+
+  const handleExportMarkdownPDF = () => {
+    if (!selectedFile) return
+    let url = getExportPdfUrl(projectId, selectedFile)
+    const token = localStorage.getItem('access_token')
+    if (token) {
+      url += `&token=${encodeURIComponent(token)}`
+    }
+    window.open(url, '_blank')
+  }
+
   // 解析相对路径
   const resolveRelativePath = (currentPath, relativePath) => {
     // 获取当前文件所在目录
@@ -1031,12 +1047,33 @@ function DocumentPage() {
               {(() => {
                 const { fileName, FileIcon, isPdf } = getHeaderDisplay(selectedFile)
                 return (
-                  <div className="docs-header-title">
-                    <span className="docs-header-item">
-                      <FileIcon className="docs-header-icon" style={isPdf ? { color: '#f5222d' } : undefined} />
-                      <span className="docs-header-text">{fileName}</span>
-                    </span>
-                  </div>
+                  <>
+                    <div className="docs-header-title">
+                      <span className="docs-header-item">
+                        <FileIcon className="docs-header-icon" style={isPdf ? { color: '#f5222d' } : undefined} />
+                        <span className="docs-header-text">{fileName}</span>
+                      </span>
+                    </div>
+                    {viewMode === 'pdf' && <div className="docs-header-actions pdf-header-toolbar" ref={setPdfToolbarTarget} />}
+                    {viewMode === 'markdown' && (
+                      <Space className="docs-header-actions">
+                        <Button
+                          icon={<VerticalAlignTopOutlined />}
+                          onClick={scrollContentToTop}
+                          size="small"
+                        >
+                          回到顶部
+                        </Button>
+                        <Button
+                          icon={<CloudDownloadOutlined />}
+                          onClick={handleExportMarkdownPDF}
+                          size="small"
+                        >
+                          下载PDF
+                        </Button>
+                      </Space>
+                    )}
+                  </>
                 )
               })()}
             </div>
@@ -1051,6 +1088,7 @@ function DocumentPage() {
                 <VirtualPDFViewer
                   url={pdfUrl}
                   filename={pdfFilename}
+                  toolbarTarget={pdfToolbarTarget}
                 />
               ) : (
                 <div className="markdown-body">
@@ -1065,72 +1103,17 @@ function DocumentPage() {
               )}
             </div>
 
-            {/* 浮动按钮组 - 仅在markdown模式显示 */}
-            {viewMode === 'markdown' && (
-              <DocFloatActions
-                scrollRef={contentRef}
-                right={tocCollapsed ? 24 : 280}
-                onExportPDF={() => {
-                  if (!selectedFile) return
-                  let url = getExportPdfUrl(projectId, selectedFile)
-                  const token = localStorage.getItem('access_token')
-                  if (token) {
-                    url += `&token=${encodeURIComponent(token)}`
-                  }
-                  window.open(url, '_blank')
-                }}
-              />
-            )}
           </Content>
 
-          {/* 右侧TOC面板 - 仅在markdown模式显示 */}
-          {viewMode === 'markdown' && !tocCollapsed && (
-            <Sider width={250} theme="light" className="docs-toc-sider">
-              <div className="toc-header">
-                <h3>文档索引</h3>
-                <Button
-                  type="text"
-                  size="small"
-                  icon={<MenuFoldOutlined />}
-                  onClick={() => setTocCollapsed(true)}
-                />
-              </div>
-              <div className="toc-content">
-                {tocItems.length > 0 ? (
-                  <Anchor
-                    affix={false}
-                    offsetTop={0}
-                    getContainer={() => contentRef.current}
-                    items={tocItems.map((item) => ({
-                      key: item.key,
-                      href: item.href,
-                      title: (
-                        <div style={{ paddingLeft: `${(item.level - 1) * 12}px`, display: 'flex', alignItems: 'center', gap: '4px' }}>
-                          <FileTextOutlined style={{ fontSize: '12px', color: '#8c8c8c' }} />
-                          <HighlightText text={item.title} keyword={searchKeyword} />
-                        </div>
-                      ),
-                    }))}
-                  />
-                ) : (
-                  <div className="toc-empty">当前文档无标题</div>
-                )}
-              </div>
-            </Sider>
+          {viewMode === 'markdown' && (
+            <FloatingToc
+              items={tocItems}
+              searchKeyword={searchKeyword}
+              getContainer={() => contentRef.current}
+              renderTitle={(item, keyword) => <HighlightText text={item.title} keyword={keyword} />}
+            />
           )}
         </Layout>
-
-        {/* TOC展开按钮 */}
-        {tocCollapsed && (
-          <Button
-            type="primary"
-            icon={<MenuUnfoldOutlined />}
-            className="toc-toggle-btn"
-            onClick={() => setTocCollapsed(false)}
-          >
-            文档索引
-          </Button>
-        )}
       </Layout>
 
       {/* 分享模态框 */}
diff --git a/frontend/src/pages/Preview/FileSharePage.jsx b/frontend/src/pages/Preview/FileSharePage.jsx
index ed4a9b2..38c8e9d 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, Button, Modal, Input, Spin, Anchor } from 'antd'
-import { CloseOutlined, LockOutlined, MenuFoldOutlined, MenuUnfoldOutlined, FileTextOutlined, FilePdfOutlined } from '@ant-design/icons'
+import { Layout, Modal, Input, Spin, Button, Space } from 'antd'
+import { CloseOutlined, LockOutlined, FileTextOutlined, FilePdfOutlined, VerticalAlignTopOutlined, CloudDownloadOutlined } 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 DocFloatActions from '@/components/DocFloatActions/DocFloatActions'
+import FloatingToc from '@/components/FloatingToc/FloatingToc'
 import VirtualPDFViewer from '@/components/PDFViewer/VirtualPDFViewer'
 import {
   getFileSharePublicInfo,
@@ -19,17 +19,17 @@ import {
 } from '@/api/share'
 import './PreviewPage.css'
 
-const { Content, Sider } = Layout
+const { Content } = Layout
 
 function FileSharePage() {
   const { shareCode } = useParams()
   const navigate = useNavigate()
   const contentRef = useRef(null)
+  const [pdfToolbarTarget, setPdfToolbarTarget] = useState(null)
   const [shareInfo, setShareInfo] = useState(null)
   const [contentInfo, setContentInfo] = useState(null)
   const [loading, setLoading] = useState(true)
   const [isMobile, setIsMobile] = useState(false)
-  const [tocCollapsed, setTocCollapsed] = useState(false)
   const [tocItems, setTocItems] = useState([])
   const [passwordModalVisible, setPasswordModalVisible] = useState(false)
   const [password, setPassword] = useState('')
@@ -117,6 +117,12 @@ function FileSharePage() {
     window.open(exportFileSharePDF(shareCode), '_blank')
   }
 
+  const scrollContentToTop = () => {
+    if (contentRef.current) {
+      contentRef.current.scrollTo({ top: 0, behavior: 'smooth' })
+    }
+  }
+
   const isExternalHref = (href) => {
     return Boolean(href && (/^[a-z][a-z\d+.-]*:/i.test(href) || href.startsWith('//')))
   }
@@ -174,6 +180,25 @@ function FileSharePage() {
                 <HeaderIcon className="preview-header-icon" style={isHeaderPdf ? { color: '#f5222d' } : undefined} />
                 <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>
+              )}
+              {contentInfo?.type === 'pdf' && <div className="preview-header-actions pdf-header-toolbar" ref={setPdfToolbarTarget} />}
             </div>
             {loading ? (
               <div className="preview-loading">
@@ -184,7 +209,11 @@ function FileSharePage() {
             ) : (
               <div className={`preview-content-wrapper ${contentInfo?.type === 'pdf' ? 'pdf-mode' : ''}`}>
                 {contentInfo?.type === 'pdf' ? (
-                  <VirtualPDFViewer url={contentInfo.document_url} filename={contentInfo.filename} />
+                  <VirtualPDFViewer
+                    url={contentInfo.document_url}
+                    filename={contentInfo.filename}
+                    toolbarTarget={pdfToolbarTarget}
+                  />
                 ) : (
                   <div className="markdown-body">
                     <ReactMarkdown
@@ -199,56 +228,15 @@ function FileSharePage() {
               </div>
             )}
 
-            {contentInfo?.type === 'markdown' && (
-              <DocFloatActions
-                scrollRef={contentRef}
-                right={!isMobile && !tocCollapsed ? 280 : 24}
-                onExportPDF={handleExportPDF}
-              />
-            )}
           </Content>
 
-          {!isMobile && contentInfo?.type === 'markdown' && !tocCollapsed && (
-            <Sider width={250} theme="light" className="preview-toc-sider">
-              <div className="toc-header">
-                <h3>文档索引</h3>
-                <Button type="text" size="small" icon={<MenuFoldOutlined />} onClick={() => setTocCollapsed(true)} />
-              </div>
-              <div className="toc-content">
-                {tocItems.length > 0 ? (
-                  <Anchor
-                    affix={false}
-                    offsetTop={0}
-                    getContainer={() => contentRef.current}
-                    items={tocItems.map((item) => ({
-                      key: item.key,
-                      href: item.href,
-                      title: (
-                        <div style={{ paddingLeft: `${(item.level - 1) * 12}px`, display: 'flex', alignItems: 'center', gap: '4px' }}>
-                          <FileTextOutlined style={{ fontSize: '12px', color: '#8c8c8c' }} />
-                          <span>{item.title}</span>
-                        </div>
-                      ),
-                    }))}
-                  />
-                ) : (
-                  <div className="toc-empty">当前文档无标题</div>
-                )}
-              </div>
-            </Sider>
+          {!isMobile && contentInfo?.type === 'markdown' && (
+            <FloatingToc
+              items={tocItems}
+              getContainer={() => contentRef.current}
+            />
           )}
         </Layout>
-
-        {!isMobile && contentInfo?.type === 'markdown' && tocCollapsed && (
-          <Button
-            type="primary"
-            icon={<MenuUnfoldOutlined />}
-            className="toc-toggle-btn"
-            onClick={() => setTocCollapsed(false)}
-          >
-            文档索引
-          </Button>
-        )}
       </div>
 
       <Modal
diff --git a/frontend/src/pages/Preview/PreviewPage.css b/frontend/src/pages/Preview/PreviewPage.css
index 026df0a..165b717 100644
--- a/frontend/src/pages/Preview/PreviewPage.css
+++ b/frontend/src/pages/Preview/PreviewPage.css
@@ -150,85 +150,6 @@
   background: var(--bg-color);
 }
 
-.preview-toc-sider {
-  border-left: 1px solid var(--border-color);
-  background: var(--bg-color-secondary) !important;
-  height: 100%;
-  overflow: hidden;
-  display: flex;
-  flex-direction: column;
-}
-
-.preview-toc-sider .ant-layout-sider-children {
-  display: flex;
-  flex-direction: column;
-  height: 100%;
-  min-height: 0;
-}
-
-.toc-header {
-  padding: 16px;
-  border-bottom: 1px solid var(--border-color);
-  display: flex;
-  justify-content: space-between;
-  align-items: center;
-  background: var(--header-bg);
-}
-
-.toc-header h3 {
-  margin: 0;
-  font-size: 14px;
-  font-weight: 600;
-  color: var(--text-color);
-}
-
-.toc-content {
-  flex: 1;
-  min-height: 0;
-  overflow-y: auto;
-  overflow-x: auto;
-  padding: 16px;
-}
-
-.toc-content .ant-anchor {
-  display: block;
-  min-height: max-content;
-  padding-left: 0;
-  padding-bottom: 65px;
-}
-
-.toc-content .ant-anchor-link {
-  padding: 6px 0;
-}
-
-.toc-content .ant-anchor-link-title {
-  font-size: 13px;
-  color: var(--text-color-secondary);
-  line-height: 1.5;
-  white-space: nowrap;
-}
-
-.toc-content .ant-anchor-link-active > .ant-anchor-link-title {
-  color: var(--link-color);
-  font-weight: 500;
-}
-
-.toc-empty {
-  color: var(--text-color-secondary);
-  text-align: center;
-  margin-top: 40px;
-  font-size: 13px;
-}
-
-.toc-toggle-btn {
-  position: fixed;
-  right: 24px;
-  top: 50%;
-  transform: translateY(-50%);
-  z-index: 100;
-  box-shadow: 0 2px 8px rgba(0, 0, 0, 0.15);
-}
-
 .preview-content {
   height: 100%;
   overflow-y: auto;
@@ -245,12 +166,15 @@
   background: var(--header-bg);
   display: flex;
   align-items: center;
+  justify-content: space-between;
+  gap: 16px;
 }
 
 .preview-header-title {
   display: flex;
   align-items: center;
   min-width: 0;
+  flex: 1;
   margin: 0;
   font-size: 16px;
   font-weight: 600;
@@ -274,6 +198,20 @@
   white-space: nowrap;
 }
 
+.preview-header-actions {
+  flex: none;
+}
+
+.pdf-header-toolbar {
+  min-width: 0;
+  overflow-x: auto;
+  overflow-y: hidden;
+}
+
+.pdf-header-toolbar .pdf-toolbar {
+  white-space: nowrap;
+}
+
 .preview-content-header h3:not(.preview-header-title) {
   margin: 0;
   font-size: 16px;
@@ -494,10 +432,6 @@
     width: 240px !important;
   }
 
-  .preview-toc-sider {
-    width: 200px !important;
-  }
-
   .preview-content-wrapper {
     max-width: 100%;
     padding: 20px;
diff --git a/frontend/src/pages/Preview/ProjectSharePage.jsx b/frontend/src/pages/Preview/ProjectSharePage.jsx
index c1b8e27..08ced1e 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, Anchor, Empty, Tooltip } from 'antd'
-import { MenuFoldOutlined, MenuUnfoldOutlined, FileTextOutlined, FolderOutlined, FolderOpenOutlined, FilePdfOutlined, LockOutlined, MenuOutlined, CloseOutlined } from '@ant-design/icons'
+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 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 DocFloatActions from '@/components/DocFloatActions/DocFloatActions'
+import FloatingToc from '@/components/FloatingToc/FloatingToc'
 import VirtualPDFViewer from '@/components/PDFViewer/VirtualPDFViewer'
 import {
   getProjectSharePublicInfo,
@@ -49,7 +49,6 @@ function ProjectSharePage() {
   const [markdownContent, setMarkdownContent] = useState('')
   const [loading, setLoading] = useState(false)
   const [openKeys, setOpenKeys] = useState([])
-  const [tocCollapsed, setTocCollapsed] = useState(false)
   const [tocItems, setTocItems] = useState([])
   const [passwordModalVisible, setPasswordModalVisible] = useState(false)
   const [password, setPassword] = useState('')
@@ -64,6 +63,7 @@ function ProjectSharePage() {
   const [isSearching, setIsSearching] = useState(false)
   const contentRef = useRef(null)
   const viewerRef = useRef(null)
+  const [pdfToolbarTarget, setPdfToolbarTarget] = useState(null)
 
   const handleClose = () => {
     if (window.history.length > 1) {
@@ -88,7 +88,7 @@ function ProjectSharePage() {
         instance.mark(searchKeyword, {
           element: 'span',
           className: 'search-highlight',
-          exclude: ['pre', 'code', '.toc-content'],
+          exclude: ['pre', 'code', '.floating-toc'],
         })
       }
     }
@@ -381,6 +381,12 @@ function ProjectSharePage() {
     window.open(exportProjectSharePDF(shareCode, selectedFile), '_blank')
   }
 
+  const scrollContentToTop = () => {
+    if (contentRef.current) {
+      contentRef.current.scrollTo({ top: 0, behavior: 'smooth' })
+    }
+  }
+
   const menuItems = useMemo(
     () => convertTreeToMenuItems(filteredTreeData),
     [filteredTreeData, openKeys]
@@ -510,6 +516,25 @@ function ProjectSharePage() {
                 <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>
+              )}
+              {viewMode === 'pdf' && <div className="preview-header-actions pdf-header-toolbar" ref={setPdfToolbarTarget} />}
             </div>
             <div className={`preview-content-wrapper ${viewMode === 'pdf' ? 'pdf-mode' : ''}`}>
               {loading ? (
@@ -519,7 +544,7 @@ function ProjectSharePage() {
                   </Spin>
                 </div>
               ) : viewMode === 'pdf' ? (
-                <VirtualPDFViewer url={pdfUrl} filename={pdfFilename} />
+                <VirtualPDFViewer url={pdfUrl} filename={pdfFilename} toolbarTarget={pdfToolbarTarget} />
               ) : (
                 <div className="markdown-body" onClick={(e) => {
                   if (e.defaultPrevented) return
@@ -540,56 +565,17 @@ function ProjectSharePage() {
               )}
             </div>
 
-            {viewMode === 'markdown' && (
-              <DocFloatActions
-                scrollRef={contentRef}
-                right={!isMobile && !tocCollapsed ? 280 : 24}
-                onExportPDF={handleExportPDF}
-              />
-            )}
           </Content>
 
-          {!isMobile && viewMode === 'markdown' && !tocCollapsed && (
-            <Sider width={250} theme="light" className="preview-toc-sider">
-              <div className="toc-header">
-                <h3>文档索引</h3>
-                <Button type="text" size="small" icon={<MenuFoldOutlined />} onClick={() => setTocCollapsed(true)} />
-              </div>
-              <div className="toc-content">
-                {tocItems.length > 0 ? (
-                  <Anchor
-                    affix={false}
-                    offsetTop={0}
-                    getContainer={() => contentRef.current}
-                    items={tocItems.map((item) => ({
-                      key: item.key,
-                      href: item.href,
-                      title: (
-                        <div style={{ paddingLeft: `${(item.level - 1) * 12}px`, display: 'flex', alignItems: 'center', gap: '4px' }}>
-                          <FileTextOutlined style={{ fontSize: '12px', color: '#8c8c8c' }} />
-                          <HighlightText text={item.title} keyword={searchKeyword} />
-                        </div>
-                      ),
-                    }))}
-                  />
-                ) : (
-                  <div className="toc-empty">当前文档无标题</div>
-                )}
-              </div>
-            </Sider>
+          {!isMobile && viewMode === 'markdown' && (
+            <FloatingToc
+              items={tocItems}
+              searchKeyword={searchKeyword}
+              getContainer={() => contentRef.current}
+              renderTitle={(item, keyword) => <HighlightText text={item.title} keyword={keyword} />}
+            />
           )}
         </Layout>
-
-        {!isMobile && tocCollapsed && (
-          <Button
-            type="primary"
-            icon={<MenuUnfoldOutlined />}
-            className="toc-toggle-btn"
-            onClick={() => setTocCollapsed(false)}
-          >
-            文档索引
-          </Button>
-        )}
       </Layout>
 
       <Modal