diff --git a/src/components/Shell.tsx b/src/components/Shell.tsx
index 09d5dc1..8d952df 100644
--- a/src/components/Shell.tsx
+++ b/src/components/Shell.tsx
@@ -7,25 +7,47 @@ export interface ModuleConfig {
   component: ComponentType;
 }
 
+/** path 到模块 id 的映射 */
+const PATH_MAP: Record<string, string> = {
+  '/vehicle': 'assets',
+  '/assets': 'assets',
+  '/mileage': 'mileage',
+};
+
+function getInitialModule(modules: ModuleConfig[]): string {
+  // 优先看 hash
+  const hash = window.location.hash.slice(1);
+  if (modules.some((m) => m.id === hash)) return hash;
+  // 再看 pathname
+  const pathModule = PATH_MAP[window.location.pathname];
+  if (pathModule && modules.some((m) => m.id === pathModule)) return pathModule;
+  // 默认第一个
+  return modules[0]?.id ?? '';
+}
+
 function getHashModule(modules: ModuleConfig[]): string {
   const hash = window.location.hash.slice(1);
-  return modules.some((m) => m.id === hash) ? hash : modules[0]?.id ?? '';
+  return modules.some((m) => m.id === hash) ? hash : '';
 }
 
 export function Shell({ modules }: { modules: ModuleConfig[] }) {
-  const [activeModule, setActiveModule] = useState(() => getHashModule(modules));
+  const [activeModule, setActiveModule] = useState(() => getInitialModule(modules));
 
   useEffect(() => {
-    const onHashChange = () => setActiveModule(getHashModule(modules));
+    const onHashChange = () => {
+      const h = getHashModule(modules);
+      if (h) setActiveModule(h);
+    };
     window.addEventListener('hashchange', onHashChange);
     return () => window.removeEventListener('hashchange', onHashChange);
   }, [modules]);
 
   useEffect(() => {
-    if (!window.location.hash) {
-      window.location.hash = modules[0]?.id ?? '';
+    // 同步 hash 到当前模块
+    if (window.location.hash.slice(1) !== activeModule) {
+      window.location.hash = activeModule;
     }
-  }, [modules]);
+  }, [activeModule]);
 
   const switchModule = (id: string) => {
     window.location.hash = id;