diff --git a/mateclaw-ui/src/i18n/locales/en-US.ts b/mateclaw-ui/src/i18n/locales/en-US.ts
index 35b99736..0803820c 100644
--- a/mateclaw-ui/src/i18n/locales/en-US.ts
+++ b/mateclaw-ui/src/i18n/locales/en-US.ts
@@ -247,6 +247,7 @@ export default {
     mcpServers: 'MCP Connections',
     mcpConnections: 'MCP Connections',
     toolsCatalog: 'Tools (Catalog)',
+    activity: 'Activity',
     settingsGroup: 'Settings',
     agents: 'Agents',
     security: 'Security',
diff --git a/mateclaw-ui/src/i18n/locales/zh-CN.ts b/mateclaw-ui/src/i18n/locales/zh-CN.ts
index 8eb97ca4..3071a3f5 100644
--- a/mateclaw-ui/src/i18n/locales/zh-CN.ts
+++ b/mateclaw-ui/src/i18n/locales/zh-CN.ts
@@ -247,6 +247,7 @@ export default {
     mcpServers: 'MCP 连接',
     mcpConnections: 'MCP 连接',
     toolsCatalog: '工具目录',
+    activity: '活动记录',
     settingsGroup: '设置',
     agents: '智能体',
     security: '安全',
diff --git a/mateclaw-ui/src/router/index.ts b/mateclaw-ui/src/router/index.ts
index e7892a76..963011da 100644
--- a/mateclaw-ui/src/router/index.ts
+++ b/mateclaw-ui/src/router/index.ts
@@ -57,6 +57,12 @@ const router = createRouter({
         },
         // Tools 顶层入口已降级到 Settings ▸ Tools (Catalog) (RFC-090 Phase 1)
         // 旧路径 /tools 由下方 redirect 兼容
+        {
+          path: 'activity',
+          name: 'Activity',
+          component: () => import('@/views/Security/Activity/index.vue'),
+          meta: { title: 'Activity' },
+        },
         {
           path: 'plugins',
           name: 'Plugins',
@@ -124,12 +130,8 @@ const router = createRouter({
               component: () => import('@/views/Security/Members/index.vue'),
               meta: { title: 'Settings - Members' },
             },
-            {
-              path: 'activity',
-              name: 'SettingsActivity',
-              component: () => import('@/views/Security/Activity/index.vue'),
-              meta: { title: 'Settings - Activity' },
-            },
+            // RFC-090 Phase 4: Activity 提升到顶层 /activity（下方 children-out
+            // 的 settings/activity redirect 兼容旧链接，此处不再注册子路由）
             // Advanced (absorbed from top-level nav)
             {
               path: 'agent-context',
@@ -206,7 +208,9 @@ const router = createRouter({
         { path: 'workspace', redirect: '/settings/agent-context' },
         { path: 'security/workspaces', redirect: '/settings/workspaces' },
         { path: 'security/members', redirect: '/settings/members' },
-        { path: 'security/activity', redirect: '/settings/activity' },
+        // RFC-090 Phase 4: Activity 提升到顶层
+        { path: 'security/activity', redirect: '/activity' },
+        { path: 'settings/activity', redirect: '/activity' },
         { path: 'cron-jobs', redirect: '/settings/cron-jobs' },
         { path: 'datasources', redirect: '/settings/datasources' },
         { path: 'mcp-servers', redirect: '/settings/mcp-servers' },
diff --git a/mateclaw-ui/src/views/Security/Activity/index.vue b/mateclaw-ui/src/views/Security/Activity/index.vue
index c1af9e72..b9851be3 100644
--- a/mateclaw-ui/src/views/Security/Activity/index.vue
+++ b/mateclaw-ui/src/views/Security/Activity/index.vue
@@ -1,12 +1,18 @@
 <template>
-  <div class="settings-section">
-    <div class="section-header">
-      <div>
-        <h2 class="section-title">{{ t('security.activity.title') }}</h2>
-        <p class="section-desc">{{ t('security.activity.desc') }}</p>
-      </div>
-    </div>
-
+  <!-- RFC-090 Phase 4: Activity 提升到顶层路由 /activity，但本组件
+       既保留 settings-section 内层结构以便旧 Settings 引用兼容，
+       又用 mc-page-shell 包一层在顶层路由下显示完整页框。 -->
+  <div class="mc-page-shell">
+    <div class="mc-page-frame">
+      <div class="mc-page-inner activity-page">
+        <div class="mc-page-header">
+          <div>
+            <div class="mc-page-kicker">{{ t('nav.activity') }}</div>
+            <h1 class="mc-page-title">{{ t('security.activity.title') }}</h1>
+            <p class="mc-page-desc">{{ t('security.activity.desc') }}</p>
+          </div>
+        </div>
+        <div class="settings-section activity-inner mc-surface-card">
     <!-- Filters -->
     <div class="filter-row">
       <select v-model="filters.action" class="filter-select" @change="loadEvents">
@@ -75,6 +81,9 @@
       <button class="btn-secondary btn-sm" :disabled="page <= 1" @click="page--; loadEvents()">&laquo;</button>
       <span class="page-info">{{ page }} / {{ Math.ceil(total / pageSize) }}</span>
       <button class="btn-secondary btn-sm" :disabled="page >= Math.ceil(total / pageSize)" @click="page++; loadEvents()">&raquo;</button>
+    </div>
+        </div>
+      </div>
     </div>
   </div>
 </template>
@@ -127,6 +136,10 @@ onMounted(() => {
 </style>
 
 <style scoped>
+/* RFC-090 Phase 4 — top-level standalone shell */
+.activity-page { gap: 18px; }
+.activity-inner { padding: 18px; }
+
 .filter-row {
   display: flex;
   gap: 8px;
diff --git a/mateclaw-ui/src/views/Settings/Layout.vue b/mateclaw-ui/src/views/Settings/Layout.vue
index 3fbd1abf..8487ce74 100644
--- a/mateclaw-ui/src/views/Settings/Layout.vue
+++ b/mateclaw-ui/src/views/Settings/Layout.vue
@@ -142,12 +142,7 @@ const sections = computed(() => [
     label: t('security.sections.members', 'Members'),
     icon: '<svg width="16" height="16" viewBox="0 0 24 24" fill="none" stroke="currentColor" stroke-width="2"><path d="M17 21v-2a4 4 0 0 0-4-4H5a4 4 0 0 0-4 4v2"/><circle cx="9" cy="7" r="4"/><path d="M23 21v-2a4 4 0 0 0-3-3.87"/><path d="M16 3.13a4 4 0 0 1 0 7.75"/></svg>',
   },
-  {
-    id: 'activity',
-    path: '/settings/activity',
-    label: t('security.sections.activity', 'Activity'),
-    icon: '<svg width="16" height="16" viewBox="0 0 24 24" fill="none" stroke="currentColor" stroke-width="2"><polyline points="22 12 18 12 15 21 9 3 6 12 2 12"/></svg>',
-  },
+  // RFC-090 Phase 4: Activity 子项移除，提升至顶层 /activity
   // Divider: Advanced
   { id: 'divider-advanced', path: '', label: t('settings.sections.advanced'), icon: '', isDivider: true },
   {
diff --git a/mateclaw-ui/src/views/layout/MainLayout.vue b/mateclaw-ui/src/views/layout/MainLayout.vue
index f4990241..b799e509 100644
--- a/mateclaw-ui/src/views/layout/MainLayout.vue
+++ b/mateclaw-ui/src/views/layout/MainLayout.vue
@@ -343,6 +343,12 @@ const navGroups = computed(() => [
         label: t('nav.plugins'),
         icon: `<svg width="18" height="18" viewBox="0 0 24 24" fill="none" stroke="currentColor" stroke-width="2"><rect x="2" y="7" width="20" height="14" rx="2" ry="2"/><path d="M16 3h-8v4h8V3z"/></svg>`,
       },
+      // RFC-090 Phase 4: Activity 提升到顶层
+      {
+        path: '/activity',
+        label: t('nav.activity'),
+        icon: `<svg width="18" height="18" viewBox="0 0 24 24" fill="none" stroke="currentColor" stroke-width="2"><polyline points="22 12 18 12 15 21 9 3 6 12 2 12"/></svg>`,
+      },
     ],
   },
   {