diff --git a/lib/common/static/instance_page.css b/lib/common/static/instance_page.css
index f54458d..0b4f628 100644
--- a/lib/common/static/instance_page.css
+++ b/lib/common/static/instance_page.css
@@ -6,6 +6,13 @@
         body{font-family:-apple-system,BlinkMacSystemFont,Segoe UI,Roboto,Helvetica Neue,Arial,sans-serif;background:#0b0d14;color:#eaeaea;padding:14px 12px}
         /* 1920 左右用满:约 96vw / 1840,两侧留白更小 */
         .container{width:100%;max-width:min(1840px,96vw);margin:0 auto;padding:0 clamp(6px,1vw,14px)}
+        /* 中控工作台内嵌:铺满 iframe,不受带鱼屏 1920 居中限制 */
+        body[data-embed-shell="1"] .container{
+            max-width:none;
+            width:100%;
+            margin:0;
+            padding:0 clamp(6px,1vw,14px);
+        }
         .header{display:flex;flex-direction:column;align-items:center;gap:8px;margin-bottom:12px}
         .header h1{font-size:1.75rem;color:#dbe4ff;text-align:center;line-height:1.25}
         .exchange-tag{font-size:.82rem;font-weight:600;color:#b8f5d0;background:#14241e;border:1px solid #2d6a4f;padding:5px 14px;border-radius:999px;letter-spacing:.06em}
@@ -168,7 +175,7 @@
             .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 1920 居中;不依赖视口宽度(避免 Win 缩放后失效) */
+        /* 带鱼屏(宽高比≥21:9):独立打开时固定 1920 居中;中控内嵌仍全宽 */
         @media (min-aspect-ratio: 21/9) {
             .container{
                 width:100%;
@@ -176,6 +183,10 @@
                 margin-left:auto;
                 margin-right:auto;
             }
+            body[data-embed-shell="1"] .container{
+                max-width:none;
+                margin:0;
+            }
         }
         @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 b31fa0c..9e06848 100644
--- a/lib/instance/templates/embed_shell.html
+++ b/lib/instance/templates/embed_shell.html
@@ -8,7 +8,7 @@
     <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=22">
+    <link rel="stylesheet" href="/static/instance_page.css?v=23">
     <link rel="stylesheet" href="/static/instance_theme.css?v=125">
     <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 8665f3d..e863262 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=22">
+    <link rel="stylesheet" href="/static/instance_page.css?v=23">
     <link rel="stylesheet" href="/static/instance_theme.css?v=125">
 
 </head>