diff --git a/assets/css/routes/user-center/shell.css b/assets/css/routes/user-center/shell.css
index 34b825fa..2d345018 100644
--- a/assets/css/routes/user-center/shell.css
+++ b/assets/css/routes/user-center/shell.css
@@ -12,12 +12,20 @@
 /* ==================== 用户中心容器 ==================== */
 /* 主内容宽度由 frontend/layout.css 的 profile shell 合同统一管理。 */
 .aksrt-profile.content-shell {
+  display: block;
   width: 100%;
   max-width: none;
   padding: 0 0 40px;
   box-sizing: border-box;
 }
 
+/* main 仍带 legacy .user-center 类；旧规则会把整页误设为 flex，并以
+ * gap:20px 挤窄第一个 flex 子项（顶部资料卡所在的 content-wrap）。 */
+.aksrt-profile.user-center {
+  display: block;
+  gap: 0;
+}
+
 /* 顶部资料卡位于双栏布局之前，必须与用户中心外壳同宽，不能继续继承
  * legacy .content-wrap / .container 的收窄规则。 */
 .aksrt-profile.content-shell > .content-wrap,
diff --git a/tests/widget-system/post-visual-contract.test.cjs b/tests/widget-system/post-visual-contract.test.cjs
index b5243fda..9503c024 100644
--- a/tests/widget-system/post-visual-contract.test.cjs
+++ b/tests/widget-system/post-visual-contract.test.cjs
@@ -466,6 +466,7 @@ test('profile routes load versioned leaf styles and keep dialogs hidden initiall
   assert.doesNotMatch(profileLayoutCss, /\.aksrt-profile\.content-shell\s*,[\s\S]*?max-width:\s*var\(--container/);
   assert.doesNotMatch(userCenterShellCss, /\.aksrt-user-center \.content-shell\s*,[\s\S]*?max-width:\s*var\(--container/);
   assert.match(userCenterShellCss, /\.aksrt-profile\.content-shell\s*\{[\s\S]*?max-width:\s*none/);
+  assert.match(userCenterShellCss, /\.aksrt-profile\.user-center\s*\{[\s\S]*?display:\s*block;[\s\S]*?gap:\s*0/);
   assert.match(userCenterShellCss, /\.aksrt-profile\.content-shell > \.content-wrap,[\s\S]*?\.aksrt-profile\.content-shell \.uc-header\s*\{[\s\S]*?width:\s*100%;[\s\S]*?max-width:\s*none/);
   assert.match(profileLayoutCss, /\.aksrt-cover-menu__panel\[hidden\]\s*\{\s*display:\s*none\s*!important;\s*\}/);
   assert.match(profileLayoutCss, /#aksrt-bg-file-input\[hidden\],[\s\S]*?#aksrt-avatar-file-input\[hidden\][\s\S]*?display:\s*none\s*!important;/);