diff --git a/serve/frontend/src/components/Layout.tsx b/serve/frontend/src/components/Layout.tsx
index ce6a2d5..a1d891a 100644
--- a/serve/frontend/src/components/Layout.tsx
+++ b/serve/frontend/src/components/Layout.tsx
@@ -1,5 +1,6 @@
-import { NavLink, Outlet } from 'react-router-dom'
-import { useQuery } from '@tanstack/react-query'
+import { useState } from 'react'
+import { NavLink, Outlet, useNavigate } from 'react-router-dom'
+import { useQuery, useQueryClient } from '@tanstack/react-query'
 import { motion } from 'framer-motion'
 import { ToastContainer } from '@/components/Toast'
 import { AlertToastContainer } from '@/components/AlertToast'
@@ -10,7 +11,6 @@ import { StockAnalysisBubble } from '@/components/stock-analysis/StockAnalysisBu
 import {
   useSettings,
   usePreferences,
-  useVersion,
 } from '@/lib/useSharedQueries'
 import { QK } from '@/lib/queryKeys'
 import {
@@ -25,6 +25,10 @@ import {
   Layers3,
   Landmark,
   BookOpenCheck,
+  Moon,
+  Sun,
+  User,
+  LogOut,
 } from 'lucide-react'
 import { Logo } from './Logo'
 import { api } from '@/lib/api'
@@ -76,14 +80,42 @@ function AIConfigBadge({ configured, model }: { configured?: boolean; model?: st
 export function Layout() {
   // ===== 共享 hooks (替代内联 useQuery) =====
   const { data: settingsState } = useSettings()
-  const { data: versionData } = useVersion()
   const { data: prefs } = usePreferences()
   const { data: analysisMenus } = useQuery({
     queryKey: QK.analysisMenus,
     queryFn: api.analysisMenus,
   })
+  const { data: authData } = useQuery({
+    queryKey: ['auth-status'],
+    queryFn: api.authStatus,
+    refetchInterval: 60_000,
+  })
 
-  const version = versionData?.version
+  const username = authData?.username
+  const navigate = useNavigate()
+  const qc = useQueryClient()
+  const [darkMode, setDarkMode] = useState(() => {
+    if (typeof document === 'undefined') return true
+    try {
+      const saved = localStorage.getItem('theme')
+      if (saved === 'light' || saved === 'dark') return saved === 'dark'
+    } catch {}
+    return document.documentElement.classList.contains('dark')
+  })
+
+  // 切换暗夜模式
+  const toggleDark = () => {
+    const next = !darkMode
+    setDarkMode(next)
+    document.documentElement.classList.toggle('dark', next)
+    try { localStorage.setItem('theme', next ? 'dark' : 'light') } catch {}
+  }
+
+  const handleLogout = async () => {
+    try { await api.authLogout() } catch {}
+    qc.invalidateQueries({ queryKey: ['auth-status'] })
+    navigate('/login', { replace: true })
+  }
 
   // 合并内置页面 + 可见的扩展分析菜单
   const analysisNav = (analysisMenus?.items ?? [])
@@ -161,26 +193,47 @@ export function Layout() {
           ))}
         </nav>
 
-        <div className="border-t border-border px-2 py-3 space-y-0.5 shrink-0">
-          <NavLink
-            to="/settings"
-            className={({ isActive }) =>
-              cn(
-                'flex items-center justify-between gap-3 px-3 py-2 rounded-btn text-sm transition-colors duration-150 ease-smooth',
-                isActive
-                  ? 'bg-elevated text-foreground font-medium'
-                  : 'text-foreground/80 hover:bg-elevated hover:text-foreground',
-              )
-            }
-          >
-            <span className="flex items-center gap-3">
-              <Settings className="h-4 w-4 shrink-0" />
-              <span>设置</span>
-            </span>
-            <span className="font-mono text-[10px] text-muted/50 select-none">
-              {version ?? ''}
-            </span>
-          </NavLink>
+        <div className="border-t border-border px-2 py-2.5 space-y-1 shrink-0">
+          {/* 登录用户 */}
+          {username && (
+            <div className="flex items-center gap-2 px-3 py-1.5 text-xs text-foreground/70">
+              <User className="h-3.5 w-3.5 shrink-0 text-muted" />
+              <span className="truncate flex-1">{username}</span>
+              <button
+                onClick={handleLogout}
+                className="rounded p-1 text-muted hover:text-danger hover:bg-danger/10 transition-colors"
+                title="退出登录"
+              >
+                <LogOut className="h-3 w-3" />
+              </button>
+            </div>
+          )}
+
+          {/* 暗夜模式 + 设置 */}
+          <div className="flex items-center gap-1 px-1">
+            <button
+              onClick={toggleDark}
+              className="flex items-center gap-2 flex-1 rounded-btn px-2 py-1.5 text-xs text-foreground/70 hover:bg-elevated hover:text-foreground transition-colors"
+              title={darkMode ? '切换为日间模式' : '切换为暗夜模式'}
+            >
+              {darkMode ? <Moon className="h-3.5 w-3.5" /> : <Sun className="h-3.5 w-3.5" />}
+              <span>{darkMode ? '暗夜' : '日间'}</span>
+            </button>
+            <NavLink
+              to="/settings"
+              className={({ isActive }) =>
+                cn(
+                  'flex items-center justify-center rounded-btn p-1.5 text-xs transition-colors',
+                  isActive
+                    ? 'bg-accent/10 text-accent'
+                    : 'text-foreground/70 hover:bg-elevated hover:text-foreground',
+                )
+              }
+              title="设置"
+            >
+              <Settings className="h-3.5 w-3.5" />
+            </NavLink>
+          </div>
         </div>
       </aside>