diff --git a/frontend/app/components/common/Topbar.tsx b/frontend/app/components/common/Topbar.tsx
index e04338a..04ac5d5 100644
--- a/frontend/app/components/common/Topbar.tsx
+++ b/frontend/app/components/common/Topbar.tsx
@@ -2,7 +2,7 @@ import { ChevronRight, LayoutGrid } from "lucide-react";
 import type { AuthUser, AuthWorkspace } from "../../context/AuthContext";
 
 type TopbarProps = {
-  activePage: string;
+  pageTitle: string;
   apiOnline: boolean;
   user: AuthUser | null;
   currentWorkspace: AuthWorkspace;
@@ -14,7 +14,7 @@ type TopbarProps = {
 };
 
 export function Topbar({
-  activePage,
+  pageTitle,
   apiOnline,
   user,
   currentWorkspace,
@@ -24,13 +24,6 @@ export function Topbar({
   onSetCurrentWorkspace,
   onLogout,
 }: TopbarProps) {
-  const pageTitles: Record<string, string> = {
-    home: "工作台",
-    scripts: "构建脚本",
-    schedules: "调度配置",
-    system: "系统管理",
-  };
-
   return (
     <header className="relative z-[2] flex h-[70px] min-h-[70px] items-center justify-between border-b border-[#dfe6ee] bg-white px-[22px]">
       <div className="flex items-center gap-[9px]">
@@ -45,7 +38,7 @@ export function Topbar({
             开发工作区
           </span>
           <h1 className="m-0 mt-px text-[18px] leading-[1.1] text-[#14243a]">
-            {pageTitles[activePage] || "工作台"}
+            {pageTitle}
           </h1>
         </div>
       </div>
diff --git a/frontend/app/routes/platform.navigation.tsx b/frontend/app/routes/platform.navigation.tsx
index 7b856c6..a01731f 100644
--- a/frontend/app/routes/platform.navigation.tsx
+++ b/frontend/app/routes/platform.navigation.tsx
@@ -21,6 +21,42 @@ export type NavigationItem = {
   children?: NavigationItem[];
 };
 
+export function pathForPage(page: ActivePage): string {
+  if (page === "home") return "/workbench";
+  return `/${page}`;
+}
+
+function normalizePath(pathname: string): string {
+  const trimmed = pathname.replace(/\/+$/, "");
+  return trimmed || "/";
+}
+
+/** 根据当前 pathname 解析顶栏标题：二级菜单显示子项名称，一级菜单显示自身名称。 */
+export function pageTitleFromPath(pathname: string): string {
+  const path = normalizePath(pathname);
+
+  for (const item of navigation) {
+    if (item.children) {
+      for (const child of item.children) {
+        const childPath =
+          child.activePath ?? `${pathForPage(child.page)}/${child.sub}`;
+        if (path === childPath) {
+          return child.label;
+        }
+      }
+    }
+  }
+
+  for (const item of navigation) {
+    const itemPath = item.activePath ?? pathForPage(item.page);
+    if (path === itemPath) {
+      return item.label;
+    }
+  }
+
+  return "工作台";
+}
+
 export const navigation: NavigationItem[] = [
   { label: "工作台",   icon: Home,     page: "home",      permission: "dashboard:view" },
   { label: "构建脚本", icon: Code,     page: "scripts",   permission: "script:view" },
diff --git a/frontend/app/routes/platform.tsx b/frontend/app/routes/platform.tsx
index 9222340..19b4d47 100644
--- a/frontend/app/routes/platform.tsx
+++ b/frontend/app/routes/platform.tsx
@@ -1,8 +1,12 @@
 import { useEffect, useState } from "react";
 import { Outlet, useLocation, useNavigate } from "react-router";
 
-import { PanelLeft, ChevronRight } from "lucide-react";
-import { navigation } from "./platform.navigation";
+import { ChevronRight, Menu } from "lucide-react";
+import {
+  navigation,
+  pathForPage,
+  pageTitleFromPath,
+} from "./platform.navigation";
 import type { ActivePage, NavigationItem, SubPage } from "./platform.navigation";
 import { Collapsible } from "@base-ui/react/collapsible";
 
@@ -21,9 +25,10 @@ import {
   SidebarMenuSub,
   SidebarMenuSubItem,
   SidebarMenuSubButton,
-  SidebarTrigger,
   SidebarInset,
+  useSidebar,
 } from "~/components/ui/sidebar";
+import { cn } from "~/lib/utils";
 import { useApi, useAuth, usePermission } from "~/context/AuthContext";
 import { useEditSessionLifecycle } from "~/features/platform/hooks/useEditSessionLifecycle";
 import {
@@ -46,11 +51,6 @@ function pageFromPath(pathname: string): ActivePage {
   return "home";
 }
 
-function pathForPage(page: ActivePage): string {
-  if (page === "home") return "/workbench";
-  return `/${page}`;
-}
-
 export function meta({}: Route.MetaArgs) {
   return [
     { title: "模型实验开发平台" },
@@ -132,6 +132,26 @@ function NavRow({
   );
 }
 
+function SidebarCollapseButton() {
+  const { toggleSidebar, state } = useSidebar();
+  const collapsed = state === "collapsed";
+
+  return (
+    <button
+      type="button"
+      onClick={toggleSidebar}
+      className={cn(
+        "flex w-full cursor-pointer items-center gap-2.5 border-t border-sidebar-border py-3.5 text-sm text-sidebar-foreground/75 transition-colors hover:bg-sidebar-accent hover:text-sidebar-accent-foreground",
+        collapsed ? "justify-center px-0" : "px-[17px]",
+      )}
+      aria-label={collapsed ? "展开菜单" : "收起菜单"}
+    >
+      <Menu className="size-4 shrink-0" />
+      {!collapsed && <span>收起菜单</span>}
+    </button>
+  );
+}
+
 export default function PlatformLayout() {
   const { currentWorkspace } = useAuth();
   if (!currentWorkspace) {
@@ -151,6 +171,7 @@ function AuthenticatedLayout() {
   const location = useLocation();
   const navigate = useNavigate();
   const activePage = pageFromPath(location.pathname);
+  const pageTitle = pageTitleFromPath(location.pathname);
   const auth = useAuth();
   const {
     user,
@@ -246,16 +267,14 @@ function AuthenticatedLayout() {
               ))}
           </SidebarMenu>
         </SidebarContent>
-        <SidebarFooter>
-          <SidebarTrigger>
-            <PanelLeft /> {!sidebarCollapsed && <span>收起菜单</span>}
-          </SidebarTrigger>
+        <SidebarFooter className="p-0">
+          <SidebarCollapseButton />
         </SidebarFooter>
       </Sidebar>
 
       <SidebarInset className="h-screen min-w-0">
         <Topbar
-          activePage={activePage}
+          pageTitle={pageTitle}
           apiOnline={apiOnline}
           user={user}
           currentWorkspace={currentWorkspace!}