diff --git a/assets/css/routes/user-center/shell.css b/assets/css/routes/user-center/shell.css
index 04d0a675..34b825fa 100644
--- a/assets/css/routes/user-center/shell.css
+++ b/assets/css/routes/user-center/shell.css
@@ -11,10 +11,21 @@
 
 /* ==================== 用户中心容器 ==================== */
 /* 主内容宽度由 frontend/layout.css 的 profile shell 合同统一管理。 */
-.user-center,
 .aksrt-profile.content-shell {
   width: 100%;
+  max-width: none;
   padding: 0 0 40px;
+  box-sizing: border-box;
+}
+
+/* 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,
+.aksrt-profile.content-shell > .content-wrap > .uc-header,
+.aksrt-profile.content-shell .uc-header {
+  width: 100%;
+  max-width: none;
+  box-sizing: border-box;
 }
 
 /* VIP, level and worn-medal marks share the global identity baseline. */
diff --git a/tests/widget-system/post-visual-contract.test.cjs b/tests/widget-system/post-visual-contract.test.cjs
index 478c87e5..b5243fda 100644
--- a/tests/widget-system/post-visual-contract.test.cjs
+++ b/tests/widget-system/post-visual-contract.test.cjs
@@ -465,6 +465,8 @@ test('profile routes load versioned leaf styles and keep dialogs hidden initiall
   assert.equal(read('templates/pages/page-user-home.php').includes('aksrt-profile"'), false);
   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\.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;/);
   assert.match(settingsSecurity, /data-modal="email-modal"[\s\S]*?<\/button>\s*<\/div>\s*<div class="security-action-item">[\s\S]*?data-modal="phone-modal"/);