diff --git a/src/assets/main.css b/src/assets/main.css
index 76bf2b3..c64bf4b 100644
--- a/src/assets/main.css
+++ b/src/assets/main.css
@@ -20,16 +20,11 @@
   }
 }
 
-/* iOS WebView 首帧偶发 vh/dvh 计算偏小，优先使用 fill-available 防止底部白边 */
-html.platform-ios {
-  --ss-app-height: -webkit-fill-available;
-}
-
+/* iOS 使用固定根容器覆盖可视区域，避免首帧/交互后视口高度抖动产生白边 */
 html.platform-ios,
-html.platform-ios body,
-html.platform-ios #root {
-  height: -webkit-fill-available;
-  min-height: -webkit-fill-available;
+html.platform-ios body {
+  height: 100%;
+  min-height: 100%;
 }
 
 html,
@@ -56,6 +51,13 @@ body,
   box-sizing: border-box;
 }
 
+html.platform-ios #root {
+  position: fixed;
+  inset: 0;
+  height: auto;
+  min-height: 0;
+}
+
 input,
 textarea {
   user-select: text;