diff --git a/frontend/src/components/MainLayout/MainLayout.jsx b/frontend/src/components/MainLayout/MainLayout.jsx
index 1d26601..1685edd 100644
--- a/frontend/src/components/MainLayout/MainLayout.jsx
+++ b/frontend/src/components/MainLayout/MainLayout.jsx
@@ -1,13 +1,27 @@
-import { useState } from 'react'
+import { useState, useEffect } from 'react'
 import { Layout } from 'antd'
+import { useLocation } from 'react-router-dom'
 import AppSider from './AppSider'
 import AppHeader from './AppHeader'
 import './MainLayout.css'
 
 const { Content } = Layout
 
+// 项目详情页路由（浏览 / 编辑）
+const isProjectDetailPath = (pathname) => {
+  return /^\/projects\/[^/]+\/(docs|editor)(\/|$)/.test(pathname)
+}
+
 function MainLayout({ children }) {
   const [collapsed, setCollapsed] = useState(true)
+  const location = useLocation()
+
+  // 进入项目详情页时，若左侧主菜单栏处于展开状态则自动收起
+  useEffect(() => {
+    if (isProjectDetailPath(location.pathname)) {
+      setCollapsed(true)
+    }
+  }, [location.pathname])
 
   const toggleCollapsed = () => {
     setCollapsed(!collapsed)
diff --git a/frontend/src/pages/Document/DocumentPage.css b/frontend/src/pages/Document/DocumentPage.css
index 67098af..f39f45c 100644
--- a/frontend/src/pages/Document/DocumentPage.css
+++ b/frontend/src/pages/Document/DocumentPage.css
@@ -28,33 +28,6 @@
   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 4e2bf77..7202e08 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, MenuUnfoldOutlined } from '@ant-design/icons'
+import { ShareAltOutlined, FileTextOutlined, FolderOutlined, FolderOpenOutlined, FilePdfOutlined, CopyOutlined, CloudDownloadOutlined, CloudUploadOutlined, ArrowLeftOutlined, ReloadOutlined, VerticalAlignTopOutlined } from '@ant-design/icons'
 import ReactMarkdown from 'react-markdown'
 import remarkGfm from 'remark-gfm'
 import rehypeRaw from 'rehype-raw'
@@ -61,7 +61,6 @@ 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)
@@ -132,7 +131,6 @@ 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
@@ -151,7 +149,6 @@ function DocumentPage() {
     setMarkdownContent('')
     setTocItems([])
     setViewMode('folder')
-    setSiderCollapsed(true)
     setOpenKeys([])
 
     if (syncUrl) {
@@ -1262,7 +1259,7 @@ function DocumentPage() {
     <div className="project-docs-page">
       <Layout className="docs-layout">
         {/* 左侧目录 */}
-        <Sider width={280} className="docs-sider" theme="light" collapsed={siderCollapsed} collapsedWidth={0}>
+        <Sider width={280} className="docs-sider" theme="light">
           <div className="docs-sider-header">
             <div className="docs-sider-title-row">
               <button
@@ -1342,19 +1339,6 @@ 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/ProjectList/ProjectList.jsx b/frontend/src/pages/ProjectList/ProjectList.jsx
index b2b3434..81d47e9 100644
--- a/frontend/src/pages/ProjectList/ProjectList.jsx
+++ b/frontend/src/pages/ProjectList/ProjectList.jsx
@@ -44,10 +44,13 @@ function ProjectList({ type = 'my' }) {
   const [unreadByProject, setUnreadByProject] = useState({})
   const pageSize = 8
 
+  // 角色字段统一小写（兼容历史数据中的大小写差异）
+  const normalizeRole = (role) => String(role || '').trim().toLowerCase()
+
   // 参与项目角色 -> 显示名称
   const projectRoleLabel = (role) => {
     const roleMap = { admin: '管理员', editor: '编辑者', viewer: '查看者' }
-    return roleMap[role] || role || '查看者'
+    return roleMap[normalizeRole(role)] || role || '查看者'
   }
 
   // 成员管理弹窗角色显示名
@@ -112,13 +115,14 @@ function ProjectList({ type = 'my' }) {
   const cardRoleClass = (project) => {
     if (type === 'my') return 'role-owner'
     const roleMap = { admin: 'role-admin', editor: 'role-editor', viewer: 'role-viewer' }
-    return roleMap[project.user_role] || 'role-viewer'
+    return roleMap[normalizeRole(project.user_role)] || 'role-viewer'
   }
 
   // 卡片角色徽章图标
   const cardRoleIcon = (project) => {
-    if (type === 'my' || project.user_role === 'admin') return <SafetyOutlined />
-    if (project.user_role === 'editor') return <FormOutlined />
+    const role = normalizeRole(project.user_role)
+    if (type === 'my' || role === 'admin') return <SafetyOutlined />
+    if (role === 'editor') return <FormOutlined />
     return <ReadOutlined />
   }
 
@@ -1183,7 +1187,7 @@ function ProjectList({ type = 'my' }) {
                       return (
                         <Select
                           size="small"
-                          value={role}
+                          value={normalizeRole(role)}
                           style={{ width: 110 }}
                           onChange={(newRole) => handleChangeMemberRole(record, newRole)}
                           options={[