diff --git a/client/lib/screens/about/about_screen.dart b/client/lib/screens/about/about_screen.dart
index 9f56413..308f650 100644
--- a/client/lib/screens/about/about_screen.dart
+++ b/client/lib/screens/about/about_screen.dart
@@ -70,7 +70,8 @@ class _AboutScreenState extends ConsumerState<AboutScreen> {
                       InkWell(
                         onTap: () =>
                             launchUrl(Uri.parse('https://beian.miit.gov.cn')),
-                        child: Text('京ICP备2026039814号',
+                        // App 备案号（-2A，与网站号 -1 区分）：工信部要求 App 显著位置标注
+                        child: Text('京ICP备2026039814号-2A',
                             style: TextStyle(
                                 fontSize: AppDims.fsXs, color: t.faint)),
                       ),
@@ -136,7 +137,7 @@ class _AboutScreenState extends ConsumerState<AboutScreen> {
                 InkWell(
                   onTap: () =>
                       launchUrl(Uri.parse('https://beian.miit.gov.cn')),
-                  child: Text('京ICP备2026039814号',
+                  child: Text('京ICP备2026039814号-2A',
                       style: TextStyle(fontSize: AppDims.fsXs, color: t.faint)),
                 ),
               ],
diff --git a/design/prototype/screens/about.html b/design/prototype/screens/about.html
index c553932..7c4abb8 100644
--- a/design/prototype/screens/about.html
+++ b/design/prototype/screens/about.html
@@ -133,7 +133,7 @@
           <div class="tl-morebar" id="tlMoreBar"><div class="btn ghost" onclick="toggleMore()"><span id="tlMoreLabel">更多历史更新</span><svg id="tlMoreCaret" viewBox="0 0 24 24"><use href="#i-chevron-down"/></svg></div></div>
         </div>
 
-        <div class="foot">© 2026 岩美科技 · 保留所有权利</div>
+        <div class="foot">© 2026 岩美科技 · 保留所有权利 · <a style="color:inherit;text-decoration:underline;text-underline-offset:2px;cursor:pointer" onclick="toast('跳转 beian.miit.gov.cn（原型）')">京ICP备2026039814号-2A</a></div>
       </div>
     </div>
   </div>
diff --git a/design/prototype/screens/m-about.html b/design/prototype/screens/m-about.html
index 799fdb3..70e265e 100644
--- a/design/prototype/screens/m-about.html
+++ b/design/prototype/screens/m-about.html
@@ -62,7 +62,7 @@
     <div class="m-section">更新日志</div>
     <div class="pe-card" style="padding:14px"><div class="tl" id="tl"></div></div>
 
-    <div style="text-align:center;font-size:var(--fs-xs);color:var(--faint);padding:18px 0 6px">© 2026 岩美科技 · 保留所有权利 · <a style="color:var(--faint);text-decoration:underline;text-underline-offset:2px;cursor:pointer" onclick="mToast('跳转 beian.miit.gov.cn（原型）')">京ICP备2026039814号</a></div>
+    <div style="text-align:center;font-size:var(--fs-xs);color:var(--faint);padding:18px 0 6px">© 2026 岩美科技 · 保留所有权利 · <a style="color:var(--faint);text-decoration:underline;text-underline-offset:2px;cursor:pointer" onclick="mToast('跳转 beian.miit.gov.cn（原型）')">京ICP备2026039814号-2A</a></div>
   </div>
 </div>
 <div class="toast" id="toast"></div>