diff --git a/frontend/src/pages/Document/DocumentPage.css b/frontend/src/pages/Document/DocumentPage.css
index f39f45c..67098af 100644
--- a/frontend/src/pages/Document/DocumentPage.css
+++ b/frontend/src/pages/Document/DocumentPage.css
@@ -28,6 +28,33 @@
   height: 100%;
 }
 
+/* 侧栏收起时：左侧悬浮展开按钮 */
+.docs-sider-expand-btn {
+  position: fixed;
+  left: 12px;
+  top: 50%;
+  transform: translateY(-50%);
+  z-index: 30;
+  width: 32px;
+  height: 48px;
+  border-radius: 8px;
+  border: 1px solid var(--border-color);
+  background: var(--header-bg);
+  color: var(--text-color-secondary);
+  font-size: 16px;
+  cursor: pointer;
+  display: flex;
+  align-items: center;
+  justify-content: center;
+  box-shadow: 0 2px 8px rgba(0, 0, 0, 0.12);
+  transition: color 0.2s ease, border-color 0.2s ease;
+}
+
+.docs-sider-expand-btn:hover {
+  color: var(--link-color);
+  border-color: var(--link-color);
+}
+
 .docs-sider-header {
   padding: 12px 10px 12px;
   border-bottom: 1px solid var(--border-color);
diff --git a/frontend/src/pages/Document/DocumentPage.jsx b/frontend/src/pages/Document/DocumentPage.jsx
index 7202e08..4e2bf77 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, Spin, Button, Tooltip, Modal, Input, Space, Dropdown, Empty, Switch, Select, TreeSelect, Radio, Alert } from 'antd'
-import { ShareAltOutlined, FileTextOutlined, FolderOutlined, FolderOpenOutlined, FilePdfOutlined, CopyOutlined, CloudDownloadOutlined, CloudUploadOutlined, ArrowLeftOutlined, ReloadOutlined, VerticalAlignTopOutlined } from '@ant-design/icons'
+import { ShareAltOutlined, FileTextOutlined, FolderOutlined, FolderOpenOutlined, FilePdfOutlined, CopyOutlined, CloudDownloadOutlined, CloudUploadOutlined, ArrowLeftOutlined, ReloadOutlined, VerticalAlignTopOutlined, MenuUnfoldOutlined } from '@ant-design/icons'
 import ReactMarkdown from 'react-markdown'
 import remarkGfm from 'remark-gfm'
 import rehypeRaw from 'rehype-raw'
@@ -61,6 +61,7 @@ function DocumentPage() {
   const [pdfUrl, setPdfUrl] = useState('')
   const [pdfFilename, setPdfFilename] = useState('')
   const [viewMode, setViewMode] = useState('markdown')
+  const [siderCollapsed, setSiderCollapsed] = useState(false)
   const [gitRepos, setGitRepos] = useState([])
   // Git 同步范围弹窗状态
   const [gitSyncModalVisible, setGitSyncModalVisible] = useState(false)
@@ -131,6 +132,7 @@ function DocumentPage() {
     setMarkdownContent('')
     setTocItems([])
     setViewMode('folder')
+    setSiderCollapsed(true)
     expandParentFolders(`${folderPath}/placeholder`)
 
     // 从内容区点击进入子文件夹时，同时展开自身，保证与左侧文件树同步
@@ -149,6 +151,7 @@ function DocumentPage() {
     setMarkdownContent('')
     setTocItems([])
     setViewMode('folder')
+    setSiderCollapsed(true)
     setOpenKeys([])
 
     if (syncUrl) {
@@ -1259,7 +1262,7 @@ function DocumentPage() {
     <div className="project-docs-page">
       <Layout className="docs-layout">
         {/* 左侧目录 */}
-        <Sider width={280} className="docs-sider" theme="light">
+        <Sider width={280} className="docs-sider" theme="light" collapsed={siderCollapsed} collapsedWidth={0}>
           <div className="docs-sider-header">
             <div className="docs-sider-title-row">
               <button
@@ -1339,6 +1342,19 @@ function DocumentPage() {
           />
         </Sider>
 
+        {/* 侧栏收起时：悬浮展开按钮 */}
+        {siderCollapsed && (
+          <button
+            type="button"
+            className="docs-sider-expand-btn"
+            onClick={() => setSiderCollapsed(false)}
+            aria-label="展开目录"
+            title="展开目录"
+          >
+            <MenuUnfoldOutlined />
+          </button>
+        )}
+
         {/* 右侧内容区 */}
         <Layout className="docs-content-layout">
           <Content className="docs-content" ref={contentRef}>
diff --git a/frontend/src/pages/Preview/FileSharePage.jsx b/frontend/src/pages/Preview/FileSharePage.jsx
index 42f6071..6b57ad0 100644
--- a/frontend/src/pages/Preview/FileSharePage.jsx
+++ b/frontend/src/pages/Preview/FileSharePage.jsx
@@ -37,6 +37,32 @@ function FileSharePage() {
   const contentRef = useRef(null)
   const largeMarkdownRef = useRef(null)
   const [headerVisible, setHeaderVisible] = useState(false)
+  const headerHoveringRef = useRef(false)
+  const headerHideTimerRef = useRef(null)
+  const clearHeaderHideTimer = () => {
+    if (headerHideTimerRef.current) {
+      clearTimeout(headerHideTimerRef.current)
+      headerHideTimerRef.current = null
+    }
+  }
+  // 延迟隐藏 Header（鼠标悬停时保持显示）
+  const scheduleHeaderHide = () => {
+    clearHeaderHideTimer()
+    if (headerHoveringRef.current) return
+    headerHideTimerRef.current = setTimeout(() => setHeaderVisible(false), 1200)
+  }
+  // 鼠标进入 Header：取消隐藏计时，保持显示
+  const handleHeaderMouseEnter = () => {
+    headerHoveringRef.current = true
+    clearHeaderHideTimer()
+  }
+  // 鼠标离开 Header：若已滚动则重新计时隐藏
+  const handleHeaderMouseLeave = () => {
+    headerHoveringRef.current = false
+    const root = contentRef.current
+    const target = root ? findScrollableEl(root) : null
+    if (target && target.scrollTop > 8) scheduleHeaderHide()
+  }
   const [pdfToolbarTarget, setPdfToolbarTarget] = useState(null)
   const [shareInfo, setShareInfo] = useState(null)
   const [contentInfo, setContentInfo] = useState(null)
@@ -60,30 +86,22 @@ function FileSharePage() {
     return () => window.removeEventListener('resize', checkMobile)
   }, [])
 
-  // 内容区 Header：仅在滚动时显示，滚动停止后延迟隐藏（含 PDF/大文档内部滚动）
+  // 内容区 Header：仅在滚动时显示，滚动停止后延迟隐藏；鼠标悬停时保持显示
   useEffect(() => {
     const root = contentRef.current
     if (!root) return
-    const hideTimer = { current: null }
-    const clearHideTimer = () => {
-      if (hideTimer.current) {
-        clearTimeout(hideTimer.current)
-        hideTimer.current = null
-      }
-    }
     const sync = (scrollEl = null) => {
       const target = scrollEl || findScrollableEl(root)
       if (!target) {
-        clearHideTimer()
+        clearHeaderHideTimer()
         setHeaderVisible(true)
         return
       }
       if (target.scrollTop > 8) {
         setHeaderVisible(true)
-        clearHideTimer()
-        hideTimer.current = setTimeout(() => setHeaderVisible(false), 1200)
+        scheduleHeaderHide()
       } else {
-        clearHideTimer()
+        clearHeaderHideTimer()
         setHeaderVisible(false)
       }
     }
@@ -92,7 +110,7 @@ function FileSharePage() {
     sync()
     return () => {
       root.removeEventListener('scroll', onScroll, true)
-      clearHideTimer()
+      clearHeaderHideTimer()
     }
   }, [contentInfo?.type, isLargeMarkdown, loading])
 
@@ -222,7 +240,10 @@ function FileSharePage() {
       <div className="file-share-shell">
         <Layout className="file-share-content-layout">
           <Content className="file-share-content" ref={contentRef}>
-            <div className={`preview-content-header file-share-content-header${headerVisible ? '' : ' preview-header-hidden'}`}>
+            <div
+              onMouseEnter={handleHeaderMouseEnter}
+              onMouseLeave={handleHeaderMouseLeave}
+              className={`preview-content-header file-share-content-header${headerVisible ? '' : ' preview-header-hidden'}`}>
               <button
                 type="button"
                 className="project-back-button"
diff --git a/frontend/src/pages/Preview/ProjectSharePage.jsx b/frontend/src/pages/Preview/ProjectSharePage.jsx
index 0d85cc5..c81e796 100644
--- a/frontend/src/pages/Preview/ProjectSharePage.jsx
+++ b/frontend/src/pages/Preview/ProjectSharePage.jsx
@@ -77,6 +77,32 @@ function ProjectSharePage() {
   const contentRef = useRef(null)
   const viewerRef = useRef(null)
   const [headerVisible, setHeaderVisible] = useState(false)
+  const headerHoveringRef = useRef(false)
+  const headerHideTimerRef = useRef(null)
+  const clearHeaderHideTimer = () => {
+    if (headerHideTimerRef.current) {
+      clearTimeout(headerHideTimerRef.current)
+      headerHideTimerRef.current = null
+    }
+  }
+  // 延迟隐藏 Header（鼠标悬停时保持显示）
+  const scheduleHeaderHide = () => {
+    clearHeaderHideTimer()
+    if (headerHoveringRef.current) return
+    headerHideTimerRef.current = setTimeout(() => setHeaderVisible(false), 1200)
+  }
+  // 鼠标进入 Header：取消隐藏计时，保持显示
+  const handleHeaderMouseEnter = () => {
+    headerHoveringRef.current = true
+    clearHeaderHideTimer()
+  }
+  // 鼠标离开 Header：若已滚动则重新计时隐藏
+  const handleHeaderMouseLeave = () => {
+    headerHoveringRef.current = false
+    const root = contentRef.current
+    const target = root ? findScrollableEl(root) : null
+    if (target && target.scrollTop > 8) scheduleHeaderHide()
+  }
   const largeMarkdownRef = useRef(null)
   const [pdfToolbarTarget, setPdfToolbarTarget] = useState(null)
   const isLargeMarkdown = isLargeMarkdownContent(markdownContent)
@@ -96,30 +122,22 @@ function ProjectSharePage() {
     return () => window.removeEventListener('resize', checkMobile)
   }, [])
 
-  // 内容区 Header：仅在滚动时显示，滚动停止后延迟隐藏（含 PDF/大文档内部滚动）
+  // 内容区 Header：仅在滚动时显示，滚动停止后延迟隐藏；鼠标悬停时保持显示
   useEffect(() => {
     const root = contentRef.current
     if (!root) return
-    const hideTimer = { current: null }
-    const clearHideTimer = () => {
-      if (hideTimer.current) {
-        clearTimeout(hideTimer.current)
-        hideTimer.current = null
-      }
-    }
     const sync = (scrollEl = null) => {
       const target = scrollEl || findScrollableEl(root)
       if (!target) {
-        clearHideTimer()
+        clearHeaderHideTimer()
         setHeaderVisible(true)
         return
       }
       if (target.scrollTop > 8) {
         setHeaderVisible(true)
-        clearHideTimer()
-        hideTimer.current = setTimeout(() => setHeaderVisible(false), 1200)
+        scheduleHeaderHide()
       } else {
-        clearHideTimer()
+        clearHeaderHideTimer()
         setHeaderVisible(false)
       }
     }
@@ -128,7 +146,7 @@ function ProjectSharePage() {
     sync()
     return () => {
       root.removeEventListener('scroll', onScroll, true)
-      clearHideTimer()
+      clearHeaderHideTimer()
     }
   }, [viewMode, isLargeMarkdown, loading])
 
@@ -711,7 +729,10 @@ function ProjectSharePage() {
 
         <Layout className="preview-content-layout">
           <Content className="preview-content" ref={contentRef}>
-            <div className={`preview-content-header${headerVisible ? '' : ' preview-header-hidden'}`}>
+            <div
+              onMouseEnter={handleHeaderMouseEnter}
+              onMouseLeave={handleHeaderMouseLeave}
+              className={`preview-content-header${headerVisible ? '' : ' preview-header-hidden'}`}>
               {isMobile && (
                 <div className="preview-header-leading-actions">
                   <Tooltip title="关闭">
diff --git a/frontend/src/pages/ProjectList/ProjectList.jsx b/frontend/src/pages/ProjectList/ProjectList.jsx
index 4e7d35e..b2b3434 100644
--- a/frontend/src/pages/ProjectList/ProjectList.jsx
+++ b/frontend/src/pages/ProjectList/ProjectList.jsx
@@ -46,7 +46,7 @@ function ProjectList({ type = 'my' }) {
 
   // 参与项目角色 -> 显示名称
   const projectRoleLabel = (role) => {
-    const roleMap = { admin: '管理者', editor: '编辑者', viewer: '查看者' }
+    const roleMap = { admin: '管理员', editor: '编辑者', viewer: '查看者' }
     return roleMap[role] || role || '查看者'
   }