diff --git a/app/assets/css/tailwind.css b/app/assets/css/tailwind.css
index e462bf9..97444cc 100644
--- a/app/assets/css/tailwind.css
+++ b/app/assets/css/tailwind.css
@@ -26,7 +26,7 @@
   /* 首页入场动画期间首帧就隐藏滚动条，避免黑色遮罩边缘露出白色滚动槽。 */
   html.is-home-intro-active,
   html.is-home-intro-active body {
-    overflow: hidden;
+    overflow: hidden !important;
     background: #000;
   }
 }
diff --git a/app/composables/usePageScrollLock.ts b/app/composables/usePageScrollLock.ts
index 8426b1b..9a4568c 100644
--- a/app/composables/usePageScrollLock.ts
+++ b/app/composables/usePageScrollLock.ts
@@ -7,11 +7,11 @@ let lenisLockCount = 0
 
 export const usePageScrollLock = (isLocked: Ref<boolean> | boolean) => {
   const { $lenis } = useNuxtApp() as ReturnType<typeof useNuxtApp> & { $lenis?: Lenis }
-  
+
   // SSR 和 CSR 都支持：自动将 class 注入到 HTML 标签上
   useHead({
     htmlAttrs: {
-      class: computed(() => unref(isLocked) ? 'is-home-intro-active' : undefined)
+      class: computed(() => unref(isLocked) ? 'is-home-intro-active' : '')
     }
   })
 
@@ -23,19 +23,25 @@ export const usePageScrollLock = (isLocked: Ref<boolean> | boolean) => {
     currentlyLocked = locked
 
     // Lenis 控制仅在客户端有效
-    if (import.meta.client && $lenis) {
+    if (import.meta.client) {
       if (locked) {
         lenisLockCount++
         // 只有第一个锁请求时，才真正停止 Lenis 并滚动到顶部
         if (lenisLockCount === 1) {
-          $lenis.scrollTo(0, { immediate: true })
-          $lenis.stop()
+          document.documentElement.classList.add('is-home-intro-active')
+          if ($lenis) {
+            $lenis.scrollTo(0, { immediate: true })
+            $lenis.stop()
+          }
         }
       } else {
         lenisLockCount = Math.max(0, lenisLockCount - 1)
         // 只有当所有锁请求都释放时，才重新启动 Lenis
         if (lenisLockCount === 0) {
-          $lenis.start()
+          document.documentElement.classList.remove('is-home-intro-active')
+          if ($lenis) {
+            $lenis.start()
+          }
         }
       }
     }
diff --git a/app/pages/index.vue b/app/pages/index.vue
index c857907..e198d9b 100644
--- a/app/pages/index.vue
+++ b/app/pages/index.vue
@@ -1,6 +1,7 @@
 <script setup lang="ts">
 import { computed, ref, watch } from 'vue'
 import { useI18n } from 'vue-i18n'
+import { useHead, useSeoMeta } from '#imports'
 import { useUserStore } from '~/stores/user'
 import { useAppStore } from '~/stores/app'
 import { usePageScrollLock } from '~/composables/usePageScrollLock'
@@ -20,6 +21,13 @@ if (!userStore.isLoggedIn) {
   userStore.loadDemoUser()
 }
 
+// 保证即使 Lenis 还没加载完成，也能通过原生 CSS 锁定页面
+useHead({
+  htmlAttrs: {
+    class: computed(() => (isIntroActive.value ? 'is-home-intro-active' : '')),
+  },
+})
+
 // 使用组合式函数管理 Lenis 滚动锁定
 usePageScrollLock(isIntroActive)