diff --git a/web/src/components/Layout.tsx b/web/src/components/Layout.tsx
index 5f08883..a667178 100644
--- a/web/src/components/Layout.tsx
+++ b/web/src/components/Layout.tsx
@@ -33,7 +33,7 @@ import { SystemNotice } from '@/components/business/SystemNotice'
 import { ToastHost } from '@/components/business/ToastHost'
 import { resetAuthCache } from '@/lib/auth'
 import { eventBus } from '@/lib/event-bus'
-import { Button, cn } from '@/components/ui'
+import { cn } from '@/components/ui'
 
 const NAV_ITEMS = [
   { path: '/', icon: LayoutDashboard, label: '数据仪表', exact: true },
@@ -213,23 +213,6 @@ export default function Layout() {
             )
           })}
         </nav>
-
-        {/* 桌面端：侧栏底部放一个次要折叠入口，主入口在顶栏 */}
-        {!isMobile && (
-          <div className="border-t border-[var(--border)] p-2">
-            <button
-              onClick={() => setCollapsed((v) => !v)}
-              title={collapsed ? '展开侧边栏' : '收起侧边栏'}
-              className={cn(
-                'flex h-9 w-full items-center rounded-md text-[12px] text-[var(--text-muted)] transition-colors hover:bg-[var(--bg-hover)] hover:text-[var(--text-primary)]',
-                sidebarCollapsed ? 'justify-center' : 'gap-2 px-2.5',
-              )}
-            >
-              {collapsed ? <ChevronRight size={15} strokeWidth={1.5} /> : <ChevronLeft size={15} strokeWidth={1.5} />}
-              {!sidebarCollapsed && <span>收起导航</span>}
-            </button>
-          </div>
-        )}
       </aside>
 
       <main className="flex min-w-0 flex-1 flex-col">
@@ -237,19 +220,19 @@ export default function Layout() {
           <div className="flex min-w-0 flex-1 items-center gap-2">
             {isMobile ? (
               <button
-                className="rounded-md p-2 text-[var(--text-secondary)] hover:bg-[var(--bg-tertiary)]"
+                className="inline-flex h-8 w-8 items-center justify-center rounded-md text-[var(--text-secondary)] hover:bg-[var(--bg-tertiary)] hover:text-[var(--text-primary)]"
                 onClick={() => setMenuOpen(true)}
                 title="打开菜单"
               >
-                <Menu size={18} strokeWidth={1.5} />
+                <Menu size={16} strokeWidth={1.5} />
               </button>
             ) : (
               <button
-                className="rounded-md p-2 text-[var(--text-secondary)] hover:bg-[var(--bg-tertiary)] hover:text-[var(--text-primary)]"
+                className="inline-flex h-8 w-8 items-center justify-center rounded-md text-[var(--text-secondary)] hover:bg-[var(--bg-tertiary)] hover:text-[var(--text-primary)]"
                 onClick={() => setCollapsed((v) => !v)}
                 title={collapsed ? '展开侧边栏' : '收起侧边栏'}
               >
-                {collapsed ? <PanelLeftOpen size={17} strokeWidth={1.5} /> : <PanelLeftClose size={17} strokeWidth={1.5} />}
+                {collapsed ? <PanelLeftOpen size={16} strokeWidth={1.5} /> : <PanelLeftClose size={16} strokeWidth={1.5} />}
               </button>
             )}
             <p className="truncate text-[13px] text-[var(--text-muted)]" title={sentence}>
@@ -257,30 +240,30 @@ export default function Layout() {
             </p>
           </div>
 
-          <div className="flex items-center gap-1.5">
+          {/* 顶栏工具统一 h-8，避免通知/主题/用户高度不一致 */}
+          <div className="flex h-8 items-center gap-1.5">
             <NodeSwitcher />
             <SystemNotice />
-            <Button
-              variant="secondary"
-              size="icon"
+            <button
+              type="button"
               onClick={toggleTheme}
               title={theme === 'light' ? '深色模式' : '浅色模式'}
-              className="h-8 w-8"
+              className="inline-flex h-8 w-8 shrink-0 items-center justify-center rounded-md border border-[var(--border)] bg-[var(--bg-primary)] text-[var(--text-secondary)] transition-colors hover:border-[var(--border-hover)] hover:bg-[var(--bg-tertiary)] hover:text-[var(--text-primary)]"
             >
               {theme === 'light' ? <Moon size={15} strokeWidth={1.5} /> : <Sun size={15} strokeWidth={1.5} />}
-            </Button>
+            </button>
 
-            {/* 用户菜单：退出登录放这里，比左下角更干净 */}
             <div className="relative" ref={userMenuRef}>
               <button
+                type="button"
                 onClick={() => setUserMenuOpen((v) => !v)}
                 className={cn(
-                  'flex h-8 items-center gap-1.5 rounded-md border border-[var(--border)] bg-[var(--bg-primary)] px-2 text-[12px] text-[var(--text-secondary)] transition-colors hover:border-[var(--border-hover)] hover:text-[var(--text-primary)]',
+                  'inline-flex h-8 items-center gap-1.5 rounded-md border border-[var(--border)] bg-[var(--bg-primary)] px-2 text-[12px] leading-none text-[var(--text-secondary)] transition-colors hover:border-[var(--border-hover)] hover:text-[var(--text-primary)]',
                   userMenuOpen && 'border-[var(--border-hover)] text-[var(--text-primary)]',
                 )}
                 title="账户"
               >
-                <span className="flex h-5 w-5 items-center justify-center rounded-full bg-[var(--bg-tertiary)] text-[var(--text-muted)]">
+                <span className="inline-flex h-5 w-5 shrink-0 items-center justify-center rounded-full bg-[var(--bg-tertiary)] text-[var(--text-muted)]">
                   <UserRound size={12} strokeWidth={1.75} />
                 </span>
                 <span className="hidden max-w-[96px] truncate sm:inline">{username}</span>
@@ -293,6 +276,7 @@ export default function Layout() {
                     <div className="truncate text-[11px] text-[var(--text-muted)]">已登录</div>
                   </div>
                   <button
+                    type="button"
                     onClick={() => {
                       setUserMenuOpen(false)
                       void logout()
diff --git a/web/src/components/business/NodeSwitcher.tsx b/web/src/components/business/NodeSwitcher.tsx
index 6184ee0..f04ab65 100644
--- a/web/src/components/business/NodeSwitcher.tsx
+++ b/web/src/components/business/NodeSwitcher.tsx
@@ -76,10 +76,10 @@ export function NodeSwitcher() {
   return (
     <div
       className={cn(
-        'inline-flex h-8 max-w-[150px] items-center gap-1 rounded-md border px-2 text-[11px]',
+        'inline-flex h-8 max-w-[150px] shrink-0 items-center gap-1 rounded-md border px-2 text-[11px] leading-none',
         selected !== 'local'
           ? 'border-amber-500/30 bg-amber-500/10 text-amber-600 dark:text-amber-400'
-          : 'border-[var(--border)] bg-[var(--bg-secondary)] text-[var(--text-secondary)]',
+          : 'border-[var(--border)] bg-[var(--bg-primary)] text-[var(--text-secondary)]',
       )}
     >
       <MonitorDot size={12} className="shrink-0" />
diff --git a/web/src/components/business/SystemNotice.tsx b/web/src/components/business/SystemNotice.tsx
index ff40ebb..48b4122 100644
--- a/web/src/components/business/SystemNotice.tsx
+++ b/web/src/components/business/SystemNotice.tsx
@@ -3,7 +3,6 @@ import { Bell, Check } from 'lucide-react'
 import { api, LOG_CATEGORY, LOG_STATUS, type AppLog } from '@/api'
 import { LOG_EVENTS } from '@/constants'
 import { useEventBus } from '@/hooks/useEventBus'
-import { Button } from '@/components/ui'
 import { formatDateTime } from '@/lib/format'
 import { cn } from '@/lib/utils'
 
@@ -63,18 +62,17 @@ export function SystemNotice() {
 
   return (
     <div className="relative">
-      <Button
-        variant="secondary"
-        size="icon"
-        className="relative h-8 w-8"
+      <button
+        type="button"
+        className="relative inline-flex h-8 w-8 shrink-0 items-center justify-center rounded-md border border-[var(--border)] bg-[var(--bg-primary)] text-[var(--text-secondary)] transition-colors hover:border-[var(--border-hover)] hover:bg-[var(--bg-tertiary)] hover:text-[var(--text-primary)]"
         title="系统通知"
         onClick={() => setOpen((v) => !v)}
       >
         <Bell size={15} strokeWidth={1.5} />
         {unread > 0 ? (
-          <span className="absolute right-1 top-1 h-2 w-2 animate-pulse rounded-full bg-red-500" />
+          <span className="absolute right-1.5 top-1.5 h-1.5 w-1.5 animate-pulse rounded-full bg-red-500" />
         ) : null}
-      </Button>
+      </button>
 
       {open ? (
         <>