diff --git a/lib/common/static/instance_page.css b/lib/common/static/instance_page.css
index 79c2399..38fe057 100644
--- a/lib/common/static/instance_page.css
+++ b/lib/common/static/instance_page.css
@@ -165,9 +165,14 @@
             .panel-scroll,.pos-list{max-height:420px}
             .records-card .table-wrap{max-height:620px;overflow:auto}
         }
-        /* 带鱼屏(宽高比≥21:9):整页固定 1600 居中;普通宽屏仍用 min(1840px,96vw) */
-        @media (min-aspect-ratio: 21/9) and (min-width: 1601px) {
-            .container{max-width:1600px;width:100%}
+        /* 带鱼屏(宽高比≥21:9):整页固定 1600 居中;不依赖 2000px 视口(避免 Win 缩放后失效) */
+        @media (min-aspect-ratio: 21/9) {
+            .container{
+                width:100%;
+                max-width:min(1600px, calc(100vw - 24px));
+                margin-left:auto;
+                margin-right:auto;
+            }
         }
         @media (min-width: 2560px){
             .dual-panel-grid{gap:18px}
diff --git a/lib/instance/templates/embed_shell.html b/lib/instance/templates/embed_shell.html
index 87475fb..26c4489 100644
--- a/lib/instance/templates/embed_shell.html
+++ b/lib/instance/templates/embed_shell.html
@@ -7,7 +7,7 @@
     <script src="/static/autofill_guard.js?v=1"></script>
     <link rel="stylesheet" href="/static/instance_theme_early.css?v=4">
     <link rel="stylesheet" href="/static/account_risk_badge.css?v=4">
-    <link rel="stylesheet" href="/static/instance_page.css?v=19">
+    <link rel="stylesheet" href="/static/instance_page.css?v=20">
     <link rel="stylesheet" href="/static/instance_theme.css?v=124">
     <script src="/static/account_risk_badge.js?v=4"></script>
     <script src="/static/open_submit_gate.js?v=1"></script>
diff --git a/lib/instance/templates/index.html b/lib/instance/templates/index.html
index b2e3985..29b6692 100644
--- a/lib/instance/templates/index.html
+++ b/lib/instance/templates/index.html
@@ -18,7 +18,7 @@
     <link rel="apple-touch-icon" href="/static/icons/apple-touch-icon.png">
     <link rel="manifest" href="/static/icons/manifest.webmanifest">
     <title>{{ pwa_app_name }}</title>
-    <link rel="stylesheet" href="/static/instance_page.css?v=19">
+    <link rel="stylesheet" href="/static/instance_page.css?v=20">
     <link rel="stylesheet" href="/static/instance_theme.css?v=118">
 
 </head>