diff --git a/backend/app/api/v1/auth.py b/backend/app/api/v1/auth.py
index b6824db5..14d7690d 100644
--- a/backend/app/api/v1/auth.py
+++ b/backend/app/api/v1/auth.py
@@ -9,7 +9,7 @@ import uuid
 
 from app.core.config import settings
 from app.core.login_crypto import create_login_challenge, decrypt_login_payload, get_public_key_pem
-from app.core.request_context import resolve_ctms_client_type
+from app.core.request_context import resolve_client_ip, resolve_ctms_client_type
 from app.core.security import create_access_token, decode_token, decode_token_allow_expired, oauth2_scheme, verify_password
 from app.core.deps import get_current_user, get_db_session
 from app.crud import user as user_crud
@@ -379,6 +379,7 @@ async def heartbeat_login_session(
     return {
         "status": "online",
         "last_seen_at": session.last_seen_at.isoformat(),
+        "client_ip": resolve_client_ip(request),
     }
 
 
diff --git a/backend/tests/test_user_login_sessions.py b/backend/tests/test_user_login_sessions.py
index 343ace6e..e1420621 100644
--- a/backend/tests/test_user_login_sessions.py
+++ b/backend/tests/test_user_login_sessions.py
@@ -1,5 +1,6 @@
 from datetime import datetime, timedelta, timezone
 import uuid
+from pathlib import Path
 
 import pytest
 
@@ -20,6 +21,13 @@ def test_legacy_session_id_is_stable_without_storing_a_token():
     assert isinstance(first, uuid.UUID)
 
 
+def test_session_heartbeat_returns_server_observed_client_ip():
+    auth_source = (Path(__file__).resolve().parents[1] / "app" / "api" / "v1" / "auth.py").read_text()
+
+    assert "resolve_client_ip(request)" in auth_source
+    assert '"client_ip": resolve_client_ip(request)' in auth_source
+
+
 @pytest.mark.asyncio
 async def test_login_summary_marks_recent_unended_sessions_online(db_session, monkeypatch):
     now = datetime.now(timezone.utc)
diff --git a/frontend/src/api/authClient.ts b/frontend/src/api/authClient.ts
index e7d6da99..39a07541 100644
--- a/frontend/src/api/authClient.ts
+++ b/frontend/src/api/authClient.ts
@@ -36,6 +36,7 @@ export type LoginKeyResponse = {
 export type SessionHeartbeatResponse = {
   status: "online";
   last_seen_at: string;
+  client_ip: string | null;
 };
 
 export type EncryptedPasswordRequest = {
diff --git a/frontend/src/components/AccountConnectionStatus.test.ts b/frontend/src/components/AccountConnectionStatus.test.ts
index 5b30f13b..d2d59402 100644
--- a/frontend/src/components/AccountConnectionStatus.test.ts
+++ b/frontend/src/components/AccountConnectionStatus.test.ts
@@ -14,6 +14,22 @@ describe("account connection status", () => {
     expect(component).toContain("当前账号与连接状态");
     expect(component).toContain("API 延迟");
     expect(component).toContain("会话状态");
+    expect(component).toContain("mode === 'network'");
+    expect(component).toContain("当前 IP");
+    expect(component).toContain("clientIpLabel");
+    expect(component).toContain("连接安全检查");
+    expect(component).toContain("runSecurityCheck");
+    expect(component).toContain("evaluateConnectionSecurity");
+    expect(component).toContain("const securityChecked = ref(true)");
+    expect(component).toContain("const securityCheckExpanded = ref(true)");
+    expect(component).toContain("const nowTs = ref(Date.now())");
+    expect(component).toContain("const tokenExpiryAt = computed");
+    expect(component).toContain("const credentialDeadlineAt = computed");
+    expect(component).toContain("return session.lastUserActiveAt + IDLE_TIMEOUT_MINUTES * 60 * 1000");
+    expect(component).toContain("sessionDeadlineAt: credentialDeadlineAt.value");
+    expect(component).toContain("Math.min(IDLE_TIMEOUT_MINUTES, calculatedMinutes)");
+    expect(component).toContain("sessionClockTimer !== undefined");
+    expect(component).toContain("window.clearInterval(sessionClockTimer)");
     expect(component).toContain("不代表系统健康评分");
     expect(component).not.toContain("ip_address");
     expect(component).not.toContain("access_token");
diff --git a/frontend/src/components/AccountConnectionStatus.vue b/frontend/src/components/AccountConnectionStatus.vue
index 72cca195..add7dab4 100644
--- a/frontend/src/components/AccountConnectionStatus.vue
+++ b/frontend/src/components/AccountConnectionStatus.vue
@@ -9,6 +9,43 @@
     <span>{{ statusLabel }}</span>
   </span>
 
+  <section v-else-if="mode === 'network'" class="network-overview" aria-label="当前网络状态">
+    <div class="network-overview-head">
+      <span>网络状态</span>
+      <span class="connection-state-badge" :class="`is-${status}`">
+        <i class="account-connection-dot"></i>
+        {{ statusLabel }}
+      </span>
+    </div>
+    <dl class="network-overview-grid">
+      <div class="network-ip-row">
+        <dt>当前 IP</dt>
+        <dd :title="clientIpLabel">{{ clientIpLabel }}</dd>
+      </div>
+      <div>
+        <dt>API 延迟</dt>
+        <dd>{{ latencyLabel }}</dd>
+      </div>
+      <div>
+        <dt>最近通信</dt>
+        <dd>{{ lastCommunicationLabel }}</dd>
+      </div>
+    </dl>
+    <button class="security-check-trigger" type="button" :disabled="securityChecking" @click="runSecurityCheck">
+      <span>连接安全检查</span>
+      <strong :class="`is-${securityResult.level}`">
+        {{ securityChecking ? "检查中" : securityChecked ? securityResult.label : "立即检查" }}
+      </strong>
+    </button>
+    <ul v-if="securityCheckExpanded" class="security-check-list" aria-live="polite">
+      <li v-for="item in securityResult.checks" :key="item.key">
+        <i :class="`is-${item.level}`"></i>
+        <span>{{ item.label }}</span>
+        <small>{{ item.detail }}</small>
+      </li>
+    </ul>
+  </section>
+
   <div v-else class="account-connection-details" aria-label="当前账号与连接状态" @click.stop>
     <div class="connection-details-head">
       <span class="connection-details-title">当前账号</span>
@@ -51,15 +88,16 @@
 </template>
 
 <script setup lang="ts">
-import { computed, onBeforeUnmount, onMounted } from "vue";
+import { computed, onBeforeUnmount, onMounted, ref } from "vue";
 import { useAuthStore } from "../store/auth";
 import { useSessionStore } from "../store/session";
-import { getAppMetadata, isTauriRuntime } from "../runtime";
+import { clientRuntime, getAppMetadata, isTauriRuntime } from "../runtime";
 import { IDLE_TIMEOUT_MINUTES } from "../session/sessionManager";
 import { parseJwtExp } from "../session/jwt";
 import { useConnectionStatus } from "../composables/useConnectionStatus";
+import { evaluateConnectionSecurity } from "../utils/connectionSecurity";
 
-withDefaults(defineProps<{ mode?: "indicator" | "details" }>(), {
+withDefaults(defineProps<{ mode?: "indicator" | "details" | "network" }>(), {
   mode: "indicator",
 });
 
@@ -71,11 +109,18 @@ const {
   status,
   statusLabel,
   latencyMs,
+  clientIp,
   lastSuccessAt,
   lastCheckedAt,
+  checkConnection,
   startConnectionMonitor,
 } = useConnectionStatus();
 let stopConnectionMonitor: (() => void) | undefined;
+const nowTs = ref(Date.now());
+let sessionClockTimer: number | undefined;
+const securityChecking = ref(false);
+const securityChecked = ref(true);
+const securityCheckExpanded = ref(true);
 
 const userDisplayName = computed(
   () => auth.user?.full_name || auth.user?.username || auth.user?.email || "当前用户",
@@ -89,25 +134,34 @@ const clientLabel = computed(() => {
 const environmentLabel = computed(() =>
   import.meta.env.VITE_RUNTIME_ENV === "production" ? "生产环境" : "开发环境",
 );
-const effectiveNow = computed(() => Math.max(lastCheckedAt.value || 0, Date.now()));
+const effectiveNow = computed(() => Math.max(lastCheckedAt.value || 0, nowTs.value));
+const tokenExpiryAt = computed(() => (auth.token ? parseJwtExp(auth.token) : null));
 const sessionDeadlineAt = computed(() => {
-  const tokenExpiryAt = auth.token ? parseJwtExp(auth.token) : null;
-  if (!tokenExpiryAt) return null;
-  if (isDesktop) return tokenExpiryAt;
-  return Math.min(tokenExpiryAt, session.lastUserActiveAt + IDLE_TIMEOUT_MINUTES * 60 * 1000);
+  if (!auth.token) return null;
+  if (isDesktop) return tokenExpiryAt.value;
+  return session.lastUserActiveAt + IDLE_TIMEOUT_MINUTES * 60 * 1000;
+});
+const credentialDeadlineAt = computed(() => {
+  if (!tokenExpiryAt.value) return sessionDeadlineAt.value;
+  if (!sessionDeadlineAt.value) return tokenExpiryAt.value;
+  return Math.min(tokenExpiryAt.value, sessionDeadlineAt.value);
 });
 const sessionRemainingLabel = computed(() => {
   if (!auth.token) return "未登录";
   if (!sessionDeadlineAt.value) return "有效";
   const remainingMs = sessionDeadlineAt.value - effectiveNow.value;
   if (remainingMs <= 0) return "即将失效";
-  const totalMinutes = Math.max(1, Math.ceil(remainingMs / 60_000));
+  const calculatedMinutes = Math.max(1, Math.ceil(remainingMs / 60_000));
+  const totalMinutes = isDesktop
+    ? calculatedMinutes
+    : Math.min(IDLE_TIMEOUT_MINUTES, calculatedMinutes);
   if (totalMinutes < 60) return `剩余 ${totalMinutes} 分钟`;
   const totalHours = Math.floor(totalMinutes / 60);
   if (totalHours < 24) return `剩余 ${totalHours} 小时`;
   return `剩余 ${Math.floor(totalHours / 24)} 天`;
 });
 const latencyLabel = computed(() => (latencyMs.value === null ? "--" : `${latencyMs.value} ms`));
+const clientIpLabel = computed(() => clientIp.value || (status.value === "checking" ? "检测中" : "--"));
 const lastCommunicationLabel = computed(() => {
   if (!lastSuccessAt.value) return status.value === "checking" ? "检测中" : "暂无成功记录";
   return new Date(lastSuccessAt.value).toLocaleTimeString("zh-CN", {
@@ -116,13 +170,41 @@ const lastCommunicationLabel = computed(() => {
     second: "2-digit",
   });
 });
+const securityResult = computed(() => evaluateConnectionSecurity({
+  apiBaseUrl: clientRuntime.apiBaseUrl(),
+  pageOrigin: window.location.origin,
+  status: status.value,
+  hasToken: Boolean(auth.token),
+  sessionDeadlineAt: credentialDeadlineAt.value,
+  now: effectiveNow.value,
+  clientIp: clientIp.value,
+  latencyMs: latencyMs.value,
+  sessionRemainingLabel: sessionRemainingLabel.value,
+}));
+
+const runSecurityCheck = async () => {
+  securityCheckExpanded.value = true;
+  securityChecking.value = true;
+  try {
+    await checkConnection();
+    nowTs.value = Date.now();
+    securityChecked.value = true;
+  } finally {
+    securityChecking.value = false;
+  }
+};
 
 onMounted(() => {
   stopConnectionMonitor = startConnectionMonitor();
+  nowTs.value = Date.now();
+  sessionClockTimer = window.setInterval(() => {
+    nowTs.value = Date.now();
+  }, 1_000);
 });
 
 onBeforeUnmount(() => {
   stopConnectionMonitor?.();
+  if (sessionClockTimer !== undefined) window.clearInterval(sessionClockTimer);
 });
 </script>
 
@@ -138,6 +220,156 @@ onBeforeUnmount(() => {
   white-space: nowrap;
 }
 
+.network-overview {
+  box-sizing: border-box;
+  width: 100%;
+  margin-top: 14px;
+  padding: 14px 16px;
+  border: 1px solid rgba(203, 213, 225, 0.82);
+  border-radius: 12px;
+  background: rgba(255, 255, 255, 0.66);
+  color: #334155;
+}
+
+.network-overview-head {
+  display: flex;
+  align-items: center;
+  justify-content: space-between;
+  gap: 12px;
+  color: #334155;
+  font-size: 12.5px;
+  font-weight: 750;
+}
+
+.network-overview-grid {
+  display: grid;
+  grid-template-columns: repeat(2, minmax(0, 1fr));
+  gap: 10px 14px;
+  margin: 12px 0 0;
+  padding-top: 11px;
+  border-top: 1px solid rgba(226, 232, 240, 0.9);
+}
+
+.network-overview-grid div,
+.network-overview-grid dt,
+.network-overview-grid dd {
+  min-width: 0;
+  margin: 0;
+}
+
+.security-check-trigger {
+  appearance: none;
+  display: flex;
+  align-items: center;
+  justify-content: space-between;
+  width: 100%;
+  margin-top: 12px;
+  padding: 10px 0 0;
+  border: 0;
+  border-top: 1px solid rgba(226, 232, 240, 0.9);
+  background: transparent;
+  color: #475569;
+  font: inherit;
+  font-size: 11px;
+  font-weight: 700;
+  cursor: pointer;
+}
+
+.security-check-trigger:disabled {
+  cursor: wait;
+  opacity: 0.72;
+}
+
+.security-check-trigger strong {
+  font-size: 10.5px;
+  font-weight: 750;
+}
+
+.security-check-trigger .is-safe {
+  color: #15803d;
+}
+
+.security-check-trigger .is-warning {
+  color: #b45309;
+}
+
+.security-check-trigger .is-danger {
+  color: #dc2626;
+}
+
+.security-check-list {
+  display: grid;
+  gap: 7px;
+  margin: 10px 0 0;
+  padding: 10px 0 0;
+  border-top: 1px dashed rgba(203, 213, 225, 0.9);
+  list-style: none;
+}
+
+.security-check-list li {
+  display: grid;
+  grid-template-columns: 7px minmax(0, 1fr) auto;
+  align-items: center;
+  gap: 7px;
+  min-width: 0;
+}
+
+.security-check-list i {
+  width: 6px;
+  height: 6px;
+  border-radius: 50%;
+  background: #94a3b8;
+}
+
+.security-check-list i.is-safe {
+  background: #22a663;
+}
+
+.security-check-list i.is-warning {
+  background: #d99b21;
+}
+
+.security-check-list i.is-danger {
+  background: #e05252;
+}
+
+.security-check-list span,
+.security-check-list small {
+  overflow: hidden;
+  text-overflow: ellipsis;
+  white-space: nowrap;
+}
+
+.security-check-list span {
+  color: #475569;
+  font-size: 10.5px;
+  font-weight: 650;
+}
+
+.security-check-list small {
+  color: #94a3b8;
+  font-size: 9.5px;
+}
+
+.network-overview-grid .network-ip-row {
+  grid-column: 1 / -1;
+}
+
+.network-overview-grid dt {
+  margin-bottom: 3px;
+  color: #94a3b8;
+  font-size: 10px;
+}
+
+.network-overview-grid dd {
+  overflow: hidden;
+  color: #334155;
+  font-size: 11.5px;
+  font-weight: 650;
+  text-overflow: ellipsis;
+  white-space: nowrap;
+}
+
 .account-connection-dot {
   display: inline-block;
   width: 7px;
@@ -252,6 +484,30 @@ onBeforeUnmount(() => {
   color: #dbe5f1;
 }
 
+:global([data-ctms-theme="dark"]) .network-overview {
+  border-color: rgba(255, 255, 255, 0.06);
+  background: rgba(255, 255, 255, 0.02);
+}
+
+:global([data-ctms-theme="dark"]) .network-overview-head,
+:global([data-ctms-theme="dark"]) .network-overview-grid dd {
+  color: #e2e8f0;
+}
+
+:global([data-ctms-theme="dark"]) .network-overview-grid {
+  border-top-color: rgba(255, 255, 255, 0.06);
+}
+
+:global([data-ctms-theme="dark"]) .security-check-trigger,
+:global([data-ctms-theme="dark"]) .security-check-list {
+  border-color: rgba(255, 255, 255, 0.06);
+}
+
+:global([data-ctms-theme="dark"]) .security-check-trigger,
+:global([data-ctms-theme="dark"]) .security-check-list span {
+  color: #cbd5e1;
+}
+
 :global([data-ctms-theme="dark"]) .connection-account-name,
 :global([data-ctms-theme="dark"]) .connection-details-grid dd {
   color: #f8fafc;
diff --git a/frontend/src/components/DesktopLayout.vue b/frontend/src/components/DesktopLayout.vue
index 3d704c9c..926b6aff 100644
--- a/frontend/src/components/DesktopLayout.vue
+++ b/frontend/src/components/DesktopLayout.vue
@@ -2642,6 +2642,141 @@ useDesktopShortcuts(
   background: #131b28;
 }
 
+/* 小尺寸桌面窗口：工作台保持可用宽度，内容区负责滚动而不是把整个窗口撑开。 */
+@media (max-width: 1240px) {
+  .desktop-workbench {
+    grid-template-columns: 216px minmax(0, 1fr);
+    min-width: 0;
+  }
+
+  .desktop-toolbar {
+    gap: 8px;
+    padding: 0 8px;
+  }
+
+  .toolbar-right {
+    gap: 4px;
+  }
+
+  .update-notice {
+    display: none;
+  }
+
+  .command-trigger,
+  .connection-button,
+  .account-button {
+    width: 32px;
+    justify-content: center;
+    gap: 0;
+    padding: 0;
+  }
+
+  .command-trigger span,
+  .command-trigger kbd,
+  .connection-button > span:not(.connection-dot),
+  .account-name,
+  .account-button > .el-icon {
+    display: none;
+  }
+
+  .account-button {
+    padding: 0 3px;
+  }
+}
+
+@media (max-width: 960px) {
+  .desktop-workbench {
+    grid-template-columns: 196px minmax(0, 1fr);
+  }
+
+  .sidebar-head {
+    padding-right: 8px;
+    padding-left: 8px;
+  }
+
+  .sidebar-scroll {
+    padding-right: 6px;
+    padding-left: 6px;
+  }
+
+  .sidebar-link {
+    font-size: 13px;
+  }
+
+  .toolbar-title {
+    font-size: 13px;
+  }
+
+  .toolbar-subtitle {
+    font-size: 10px;
+  }
+}
+
+/* 大屏桌面端：扩大导航和工作区的节奏，避免高分辨率下内容过度拥挤。 */
+@media (min-width: 1440px) {
+  .desktop-workbench {
+    grid-template-columns: 264px minmax(0, 1fr);
+  }
+
+  .desktop-sidebar .sidebar-head {
+    padding-right: 14px;
+    padding-left: 14px;
+  }
+
+  .sidebar-scroll {
+    padding: 14px 12px 28px;
+  }
+
+  .desktop-main {
+    grid-template-rows: 56px auto minmax(0, 1fr);
+  }
+
+  .desktop-toolbar {
+    gap: 16px;
+    padding-right: 16px;
+    padding-left: 16px;
+  }
+
+  .workspace-tabs {
+    gap: 8px;
+    padding: 9px 14px;
+  }
+
+  .workspace-tab {
+    height: 34px;
+  }
+
+  .desktop-workbench .desktop-route-shell .table-card-toolbar,
+  .desktop-workbench .desktop-route-shell .ctms-page-header,
+  .desktop-workbench .desktop-route-shell .ctms-section-header,
+  .desktop-workbench .desktop-route-shell .unified-action-bar,
+  .desktop-workbench .desktop-route-shell .module-header {
+    padding-right: 16px;
+    padding-left: 16px;
+  }
+}
+
+@media (min-width: 1920px) {
+  .desktop-workbench {
+    grid-template-columns: 280px minmax(0, 1fr);
+  }
+
+  .desktop-toolbar {
+    padding-right: 20px;
+    padding-left: 20px;
+  }
+
+  .toolbar-title {
+    font-size: 15px;
+  }
+
+  .desktop-workbench .desktop-route-shell .module-content,
+  .desktop-workbench .desktop-route-shell .unified-section {
+    padding-right: 16px;
+    padding-left: 16px;
+  }
+}
+
 @media (prefers-reduced-motion: reduce) {
   .icon-button,
   .desktop-route-enter-active,
diff --git a/frontend/src/components/WebLayout.vue b/frontend/src/components/WebLayout.vue
index ee7f6569..c3988f5b 100644
--- a/frontend/src/components/WebLayout.vue
+++ b/frontend/src/components/WebLayout.vue
@@ -1,6 +1,14 @@
 <template>
-  <el-container class="layout-container web-layout-container">
-    <el-aside :width="isCollapsed ? '68px' : '200px'" class="layout-aside" :class="{ collapsed: isCollapsed }">
+  <el-container
+    class="layout-container web-layout-container"
+    :class="{ 'mobile-nav-open': isMobileNavOpen, 'mobile-layout': isMobileViewport }"
+    @keydown.esc="closeMobileNav"
+  >
+    <el-aside
+      :width="isMobileViewport ? '280px' : (isCollapsed ? '68px' : '200px')"
+      class="layout-aside"
+      :class="{ collapsed: isCollapsed, 'mobile-open': isMobileNavOpen }"
+    >
       <div class="aside-logo">
         <img class="logo-icon" src="/icons/ctms-icon-192.png" alt="" aria-hidden="true" />
         <span class="logo-text">{{ TEXT.common.appName }}</span>
@@ -129,7 +137,12 @@
     <el-container class="main-container">
       <el-header class="layout-header">
         <div class="header-left">
-          <el-button class="collapse-btn" @click="toggleCollapse" :aria-label="TEXT.common.labels.collapseSidebar">
+          <el-button
+            class="collapse-btn"
+            :aria-expanded="isMobileViewport ? isMobileNavOpen : undefined"
+            @click="toggleCollapse"
+            :aria-label="isMobileViewport ? '打开导航菜单' : TEXT.common.labels.collapseSidebar"
+          >
             <el-icon class="collapse-icon">
               <svg viewBox="0 0 24 24" aria-hidden="true">
                 <rect x="4" y="5" width="16" height="14" rx="2" fill="none" stroke="currentColor" stroke-width="1.8" />
@@ -358,6 +371,14 @@
     </el-container>
   </el-container>
 
+  <button
+    v-if="isMobileNavOpen"
+    type="button"
+    class="mobile-nav-backdrop"
+    aria-label="关闭导航菜单"
+    @click="closeMobileNav"
+  />
+
   <el-dialog
     v-model="profileDialogVisible"
     class="profile-settings-dialog"
@@ -444,7 +465,12 @@ const route = useRoute();
 const isDesktop = isTauriRuntime();
 const desktopMetadata = getAppMetadata();
 const isAdmin = computed(() => !!auth.user?.is_admin);
-const isCollapsed = ref(localStorage.getItem("ctms_sidebar_collapsed") === "1");
+const isCollapsed = ref(typeof localStorage !== "undefined" && localStorage.getItem("ctms_sidebar_collapsed") === "1");
+const isMobileViewport = ref(
+  typeof window !== "undefined" && typeof window.matchMedia === "function" && window.matchMedia("(max-width: 767px)").matches,
+);
+const isMobileNavOpen = ref(false);
+let mobileViewportMediaQuery: MediaQueryList | undefined;
 const projectRole = computed(() => study.currentStudyRole || (study.currentStudy as any)?.role_in_study || "");
 const canAccessAdminPermissions = computed(() => isAdmin.value || projectRole.value === "PM");
 const canAccessAuditLogs = computed(() =>
@@ -478,13 +504,14 @@ const headerReminderStats = ref({
 const headerClockNow = ref(new Date());
 let headerClockTimer: number | undefined;
 let desktopMenuUnlisten: (() => void) | undefined;
+let mobileViewportChangeHandler: ((event: MediaQueryListEvent) => void) | undefined;
 const isAdminContext = computed(() => route.path.startsWith("/admin"));
 const hasProjectContext = computed(() => Boolean(study.currentStudy) && !isAdminContext.value);
 
 /* 动态设置 body 上的侧边栏宽度 CSS 变量，用于全局弹窗定位偏移 */
 const hasSidebar = computed(() => isAdmin.value || !!study.currentStudy);
 watchEffect(() => {
-  const width = !hasSidebar.value ? '0px' : (isCollapsed.value ? '68px' : '200px');
+  const width = !hasSidebar.value || isMobileViewport.value ? '0px' : (isCollapsed.value ? '68px' : '200px');
   document.body.style.setProperty('--ctms-sidebar-width', width);
   // 在 body 上添加/移除标记类，以便全局 CSS :has() 降级使用
   if (hasSidebar.value) {
@@ -1021,6 +1048,7 @@ const handleBreadcrumbCommand = async (cmd: any) => {
 };
 
 const handleMenuSelect = (index: string) => {
+  closeMobileNav();
   if (!index || index === route.path) {
     return;
   }
@@ -1047,6 +1075,7 @@ const handleReminderCommand = (cmd: string) => {
 };
 
 watch(() => route.path, () => {
+  closeMobileNav();
   study.setViewContext(null);
   if (isDesktop) {
     const current = currentDesktopRoutePreference.value;
@@ -1070,7 +1099,20 @@ watch(
   () => refreshDesktopRoutePreferences(),
 );
 
+const closeMobileNav = () => {
+  isMobileNavOpen.value = false;
+};
+
+const syncMobileViewport = (matches: boolean) => {
+  isMobileViewport.value = matches;
+  if (!matches) closeMobileNav();
+};
+
 const toggleCollapse = () => {
+  if (isMobileViewport.value) {
+    isMobileNavOpen.value = !isMobileNavOpen.value;
+    return;
+  }
   isCollapsed.value = !isCollapsed.value;
   localStorage.setItem("ctms_sidebar_collapsed", isCollapsed.value ? "1" : "0");
 };
@@ -1110,6 +1152,12 @@ const onLogout = async () => {
 };
 
 onMounted(async () => {
+  if (typeof window.matchMedia === "function") {
+    mobileViewportMediaQuery = window.matchMedia("(max-width: 767px)");
+    syncMobileViewport(mobileViewportMediaQuery.matches);
+    mobileViewportChangeHandler = (event) => syncMobileViewport(event.matches);
+    mobileViewportMediaQuery.addEventListener("change", mobileViewportChangeHandler);
+  }
   headerClockNow.value = new Date();
   headerClockTimer = window.setInterval(() => {
     headerClockNow.value = new Date();
@@ -1139,6 +1187,9 @@ onBeforeUnmount(() => {
     window.clearInterval(headerClockTimer);
   }
   window.removeEventListener(DESKTOP_SERVER_URL_CHANGED_EVENT, updateDesktopServerUrl);
+  if (mobileViewportMediaQuery && mobileViewportChangeHandler) {
+    mobileViewportMediaQuery.removeEventListener("change", mobileViewportChangeHandler);
+  }
   desktopMenuUnlisten?.();
 });
 
@@ -2400,6 +2451,163 @@ useDesktopShortcuts(
   transform: translateY(-4px) scale(0.998);
 }
 
+.mobile-nav-backdrop {
+  display: none;
+}
+
+@media (max-width: 767px) {
+  .web-layout-container {
+    position: relative;
+    width: 100%;
+    min-width: 0;
+    overflow: hidden;
+  }
+
+  .web-layout-container .layout-aside {
+    position: fixed;
+    z-index: 100;
+    top: 0;
+    bottom: 0;
+    left: 0;
+    width: 280px !important;
+    max-width: calc(100vw - 42px);
+    transform: translateX(-105%);
+    box-shadow: 14px 0 36px rgba(15, 23, 42, 0.24);
+    transition: transform 220ms cubic-bezier(0.2, 0.8, 0.2, 1);
+  }
+
+  .web-layout-container.mobile-nav-open .layout-aside {
+    transform: translateX(0);
+  }
+
+  .web-layout-container .main-container {
+    width: 100%;
+    min-width: 0;
+  }
+
+  .web-layout-container .layout-header {
+    position: sticky;
+    top: 0;
+    z-index: 30;
+    width: 100%;
+    padding: 0 10px;
+  }
+
+  .web-layout-container .content-wrapper {
+    min-height: calc(100dvh - 52px);
+    padding: 10px;
+  }
+
+  .header-left {
+    flex: 1 1 auto;
+    min-width: 0;
+  }
+
+  .header-breadcrumb {
+    max-width: none;
+    margin-left: 4px;
+  }
+
+  .header-breadcrumb > :not(:last-child) {
+    display: none;
+  }
+
+  .header-breadcrumb .breadcrumb-item-wrapper {
+    max-width: min(48vw, 210px);
+  }
+
+  .header-right {
+    gap: 3px;
+  }
+
+  .workbench-return-button {
+    width: 32px;
+    padding: 0;
+    font-size: 0;
+  }
+
+  .workbench-return-button .el-icon {
+    margin: 0;
+    font-size: 16px;
+  }
+
+  .header-account-role,
+  .user-profile .username,
+  .user-profile .el-icon,
+  .user-profile :deep(.account-connection-status) {
+    display: none;
+  }
+
+  .dropdown-trigger.compact {
+    padding-right: 3px;
+  }
+
+  .mobile-nav-backdrop {
+    position: fixed;
+    z-index: 90;
+    inset: 0;
+    display: block;
+    width: 100%;
+    height: 100%;
+    padding: 0;
+    border: 0;
+    background: rgba(15, 23, 42, 0.38);
+    cursor: pointer;
+    -webkit-tap-highlight-color: transparent;
+  }
+}
+
+@media (max-width: 420px) {
+  .web-layout-container .layout-header {
+    padding: 0 6px;
+  }
+
+  .web-layout-container .content-wrapper {
+    padding: 8px;
+  }
+
+  .header-breadcrumb .breadcrumb-item-wrapper {
+    max-width: 42vw;
+  }
+
+  .header-reminder-button,
+  .collapse-btn,
+  .workbench-return-button,
+  .dropdown-trigger.compact {
+    width: 30px;
+    height: 30px;
+  }
+}
+
+/* 大屏网页端：增加呼吸感，但保留业务表格的全宽工作区。 */
+@media (min-width: 1440px) {
+  .web-layout-container .layout-header {
+    height: 56px !important;
+    padding-right: 20px;
+    padding-left: 20px;
+  }
+
+  .web-layout-container .aside-logo {
+    height: 64px;
+  }
+
+  .web-layout-container .content-wrapper {
+    min-height: calc(100dvh - 56px);
+    padding: 18px 24px 24px;
+  }
+}
+
+@media (min-width: 1920px) {
+  .web-layout-container .layout-header {
+    padding-right: 28px;
+    padding-left: 28px;
+  }
+
+  .web-layout-container .content-wrapper {
+    padding: 22px 32px 32px;
+  }
+}
+
 @media (prefers-reduced-motion: reduce) {
   .layout-aside,
   .aside-menu,
diff --git a/frontend/src/composables/useConnectionStatus.test.ts b/frontend/src/composables/useConnectionStatus.test.ts
index a000b40c..3e1073d3 100644
--- a/frontend/src/composables/useConnectionStatus.test.ts
+++ b/frontend/src/composables/useConnectionStatus.test.ts
@@ -16,7 +16,9 @@ vi.mock("../utils/auth", () => ({
 describe("connection status heartbeat", () => {
   beforeEach(() => {
     heartbeatSessionMock.mockReset();
-    heartbeatSessionMock.mockResolvedValue({ data: { status: "online" } });
+    heartbeatSessionMock.mockResolvedValue({
+      data: { status: "online", last_seen_at: "2026-07-13T02:00:00Z", client_ip: "203.0.113.10" },
+    });
     getTokenMock.mockReturnValue("session-token");
     Object.defineProperty(window.navigator, "onLine", { configurable: true, value: true });
   });
@@ -29,6 +31,7 @@ describe("connection status heartbeat", () => {
     await vi.waitFor(() => expect(connection.status.value).toBe("online"));
     expect(heartbeatSessionMock).toHaveBeenCalledWith("session-token");
     expect(connection.latencyMs.value).toBeGreaterThan(0);
+    expect(connection.clientIp.value).toBe("203.0.113.10");
     expect(connection.lastSuccessAt.value).not.toBeNull();
 
     Object.defineProperty(window.navigator, "onLine", { configurable: true, value: false });
diff --git a/frontend/src/composables/useConnectionStatus.ts b/frontend/src/composables/useConnectionStatus.ts
index c06c4e8b..aaf23847 100644
--- a/frontend/src/composables/useConnectionStatus.ts
+++ b/frontend/src/composables/useConnectionStatus.ts
@@ -8,6 +8,7 @@ const HEARTBEAT_INTERVAL_MS = 30_000;
 
 const status = ref<ConnectionStatus>("checking");
 const latencyMs = ref<number | null>(null);
+const clientIp = ref<string | null>(null);
 const lastSuccessAt = ref<number | null>(null);
 const lastCheckedAt = ref<number | null>(null);
 let consumerCount = 0;
@@ -30,10 +31,12 @@ const checkConnection = async () => {
       if (!token) {
         status.value = "offline";
         latencyMs.value = null;
+        clientIp.value = null;
         return;
       }
-      await heartbeatSession(token);
+      const { data } = await heartbeatSession(token);
       latencyMs.value = Math.max(1, Math.round(performance.now() - startedAt));
+      clientIp.value = data.client_ip || null;
       lastSuccessAt.value = Date.now();
       status.value = "online";
     } catch (error: any) {
@@ -92,6 +95,7 @@ export const useConnectionStatus = () => ({
   status: readonly(status),
   statusLabel,
   latencyMs: readonly(latencyMs),
+  clientIp: readonly(clientIp),
   lastSuccessAt: readonly(lastSuccessAt),
   lastCheckedAt: readonly(lastCheckedAt),
   checkConnection,
diff --git a/frontend/src/styles/main.css b/frontend/src/styles/main.css
index a93f0eaf..f652b9a3 100644
--- a/frontend/src/styles/main.css
+++ b/frontend/src/styles/main.css
@@ -1377,3 +1377,309 @@ body.is-desktop-runtime .msgbox-fade-leave-to .el-message-box {
   color: #ffffff !important;
   box-shadow: 0 4px 12px rgba(2, 132, 199, 0.3) !important;
 }
+
+/* ============================================================
+ * Responsive layout foundation
+ *
+ * 页面组件来自多个业务模块，统一在这里处理“可收缩容器”和常见
+ * 操作栏的换行；具体页面仍可针对自身信息密度补充局部规则。
+ * ============================================================ */
+*,
+*::before,
+*::after {
+  box-sizing: border-box;
+}
+
+html,
+body,
+#app {
+  width: 100%;
+  max-width: 100%;
+  overflow-x: hidden;
+}
+
+img,
+svg,
+video,
+canvas {
+  max-width: 100%;
+}
+
+.page,
+.page-inner,
+.page-body,
+.page-header,
+.ctms-page,
+.ctms-page-shell,
+.ctms-route-shell,
+.desktop-route-shell,
+.main-content,
+.main-content-card,
+.main-content-flat,
+.table-card,
+.unified-shell,
+.content-area,
+.module-content {
+  min-width: 0;
+  max-width: 100%;
+}
+
+.page > *,
+.page-inner > *,
+.page-body > *,
+.ctms-page > *,
+.ctms-page-shell > *,
+.table-card > *,
+.unified-shell > * {
+  min-width: 0;
+}
+
+.table-card-toolbar,
+.ctms-page-header,
+.ctms-page-header-row,
+.page-header,
+.section-card-header,
+.section-card-title-row,
+.hero-top,
+.toolbar-left,
+.toolbar-right,
+.filter-form,
+.filter-container,
+.ctms-filter-row,
+.ctms-page-actions,
+.ctms-section-actions {
+  min-width: 0;
+  max-width: 100%;
+}
+
+.el-table,
+.el-table__inner-wrapper,
+.el-table__header-wrapper,
+.el-table__body-wrapper,
+.el-table__footer-wrapper {
+  min-width: 0;
+  max-width: 100%;
+}
+
+.el-table__header-wrapper,
+.el-table__body-wrapper,
+.el-table__footer-wrapper {
+  overflow-x: auto;
+}
+
+.el-form,
+.el-form-item,
+.el-form-item__content,
+.el-input,
+.el-select,
+.el-date-editor,
+.el-cascader,
+.el-tree-select {
+  min-width: 0;
+  max-width: 100%;
+}
+
+@media (max-width: 1200px) {
+  .table-card-toolbar,
+  .ctms-page-header,
+  .ctms-page-header-row,
+  .page-header,
+  .section-card-header,
+  .hero-top {
+    flex-wrap: wrap;
+  }
+
+  .filter-form,
+  .ctms-filter-row {
+    align-items: flex-end;
+    flex-wrap: wrap;
+  }
+
+  .filter-item,
+  .ctms-filter-item {
+    flex: 1 1 168px;
+    min-width: min(168px, 100%);
+    max-width: 100%;
+  }
+
+  .filter-input,
+  .filter-select,
+  .filter-item .el-input,
+  .filter-item .el-select,
+  .ctms-filter-item .el-input,
+  .ctms-filter-item .el-select {
+    max-width: 100%;
+  }
+
+  .hero-stats,
+  .stats-grid,
+  .overview-grid,
+  .kpi-grid {
+    grid-template-columns: repeat(auto-fit, minmax(160px, 1fr)) !important;
+  }
+
+  .el-dialog {
+    max-width: calc(100vw - 32px) !important;
+  }
+}
+
+@media (max-width: 720px) {
+  .page,
+  .ctms-page,
+  .ctms-page-shell {
+    gap: 10px;
+  }
+
+  .table-card-toolbar,
+  .ctms-page-header,
+  .ctms-page-header-row,
+  .page-header,
+  .section-card-header,
+  .hero-top {
+    align-items: flex-start;
+    gap: 10px;
+  }
+
+  .table-card-toolbar > .toolbar-filters,
+  .table-card-toolbar > .toolbar-right,
+  .ctms-page-header > .ctms-page-actions,
+  .ctms-page-header-row > .ctms-page-actions,
+  .page-header > .actions,
+  .page-header > .page-actions {
+    width: 100%;
+    margin-left: 0;
+  }
+
+  .toolbar-filters,
+  .filter-form,
+  .ctms-filter-row,
+  .ctms-page-actions,
+  .ctms-section-actions,
+  .filter-actions,
+  .toolbar-right {
+    width: 100%;
+    flex-wrap: wrap;
+  }
+
+  .filter-item,
+  .ctms-filter-item,
+  .filter-input,
+  .filter-select,
+  .filter-item .el-input,
+  .filter-item .el-select,
+  .ctms-filter-item .el-input,
+  .ctms-filter-item .el-select {
+    flex-basis: 100%;
+    width: 100%;
+    min-width: 0;
+  }
+
+  .ctms-filter-spacer {
+    display: none;
+  }
+
+  .ctms-page-actions,
+  .ctms-section-actions,
+  .toolbar-right,
+  .filter-actions {
+    justify-content: flex-start;
+  }
+
+  .ctms-page-actions .el-button,
+  .ctms-section-actions .el-button,
+  .toolbar-right .el-button,
+  .filter-actions .el-button {
+    max-width: 100%;
+  }
+
+  .hero-stats,
+  .stats-grid,
+  .overview-grid,
+  .kpi-grid {
+    grid-template-columns: repeat(auto-fit, minmax(140px, 1fr)) !important;
+  }
+
+  .section-card-header,
+  .section-card-title-row {
+    flex-wrap: wrap;
+  }
+
+  .el-descriptions {
+    max-width: 100%;
+    overflow-x: auto;
+  }
+
+  .el-drawer {
+    width: min(620px, calc(100vw - 16px)) !important;
+  }
+
+  .el-drawer__body {
+    padding-right: 14px;
+    padding-left: 14px;
+  }
+
+  .el-dialog {
+    width: calc(100vw - 24px) !important;
+    max-width: calc(100vw - 24px) !important;
+    margin: 12px auto !important;
+  }
+
+  .el-dialog__body {
+    max-height: calc(100dvh - 148px);
+    overflow-y: auto;
+  }
+
+  .el-pagination {
+    max-width: 100%;
+    flex-wrap: wrap;
+    justify-content: center;
+    row-gap: 6px;
+  }
+}
+
+@media (max-width: 480px) {
+  .page-title,
+  .ctms-page-title {
+    font-size: 18px !important;
+  }
+
+  .page-subtitle,
+  .ctms-page-subtitle {
+    font-size: 12px !important;
+  }
+
+  .hero-stats,
+  .stats-grid,
+  .overview-grid,
+  .kpi-grid {
+    grid-template-columns: 1fr !important;
+  }
+
+  .el-button {
+    max-width: 100%;
+  }
+}
+
+/* 大屏内容密度：统计卡片与概览网格随可用宽度舒展。 */
+@media (min-width: 1440px) {
+  .hero-stats,
+  .stats-grid,
+  .overview-grid,
+  .kpi-grid {
+    gap: 16px !important;
+    grid-template-columns: repeat(auto-fit, minmax(180px, 1fr)) !important;
+  }
+
+  .ctms-page-content-grid {
+    gap: 16px;
+  }
+}
+
+@media (min-width: 1920px) {
+  .hero-stats,
+  .stats-grid,
+  .overview-grid,
+  .kpi-grid {
+    grid-template-columns: repeat(auto-fit, minmax(220px, 1fr)) !important;
+  }
+}
diff --git a/frontend/src/styles/unified-page.css b/frontend/src/styles/unified-page.css
index 844e8fea..ee3d4155 100644
--- a/frontend/src/styles/unified-page.css
+++ b/frontend/src/styles/unified-page.css
@@ -278,3 +278,93 @@
     padding-right: 14px;
   }
 }
+
+@media (max-width: 720px) {
+  .ctms-page-shell {
+    padding: 10px 12px 14px;
+  }
+
+  .ctms-page-shell.page--flush,
+  .page.page--flush {
+    padding: 0 !important;
+  }
+
+  .unified-action-bar,
+  .unified-section {
+    padding: 12px;
+  }
+
+  .unified-action-bar .ctms-page-title,
+  .unified-action-bar .page-title {
+    font-size: 18px;
+  }
+
+  .unified-action-bar .ctms-page-actions,
+  .unified-action-bar .actions {
+    width: 100%;
+    margin-left: 0;
+    flex-wrap: wrap;
+  }
+
+  .unified-shell .el-card__body,
+  .el-card.unified-shell > .el-card__body {
+    padding: 0 !important;
+  }
+
+  .unified-shell .el-table th.el-table__cell,
+  .unified-shell .el-table td.el-table__cell {
+    padding-right: 8px;
+    padding-left: 8px;
+  }
+
+  .unified-shell .kpi-enterprise {
+    min-height: 112px;
+    padding: 14px;
+  }
+
+  .unified-shell .kpi-enterprise .kpi-value {
+    font-size: 28px;
+  }
+}
+
+@media (min-width: 1440px) {
+  .ctms-page-shell:not(.page--flush) {
+    padding: 20px 28px 28px;
+  }
+
+  .ctms-page-content-grid {
+    gap: 16px;
+  }
+
+  .unified-action-bar,
+  .unified-section {
+    padding-right: 20px;
+    padding-left: 20px;
+  }
+
+  .unified-shell .kpi-enterprise {
+    min-height: 148px;
+    padding: 20px;
+  }
+
+  .unified-shell .kpi-enterprise .kpi-title {
+    font-size: 17px;
+  }
+
+  .unified-shell .kpi-enterprise .kpi-value {
+    font-size: 40px;
+  }
+}
+
+@media (min-width: 1920px) {
+  .ctms-page-shell:not(.page--flush) {
+    padding-right: 36px;
+    padding-left: 36px;
+  }
+
+  .unified-action-bar,
+  .unified-section {
+    padding-right: 28px;
+    padding-left: 28px;
+  }
+}
diff --git a/frontend/src/utils/connectionSecurity.test.ts b/frontend/src/utils/connectionSecurity.test.ts
new file mode 100644
index 00000000..035a8df7
--- /dev/null
+++ b/frontend/src/utils/connectionSecurity.test.ts
@@ -0,0 +1,44 @@
+import { describe, expect, it } from "vitest";
+import { evaluateConnectionSecurity } from "./connectionSecurity";
+
+const baseInput = {
+  apiBaseUrl: "https://ctms.example.com/",
+  pageOrigin: "https://ctms.example.com",
+  status: "online" as const,
+  hasToken: true,
+  sessionDeadlineAt: Date.now() + 30 * 60_000,
+  now: Date.now(),
+  clientIp: "203.0.113.10",
+  latencyMs: 20,
+  sessionRemainingLabel: "剩余 30 分钟",
+};
+
+describe("connection security evaluation", () => {
+  it("marks an authenticated HTTPS heartbeat with a recognized IP as safe", () => {
+    const result = evaluateConnectionSecurity(baseInput);
+
+    expect(result.level).toBe("safe");
+    expect(result.checks).toHaveLength(4);
+    expect(result.checks.find((item) => item.key === "connection")?.detail).toBe("20 ms");
+    expect(result.checks.find((item) => item.key === "session")?.detail).toBe("剩余 30 分钟");
+    expect(result.checks.find((item) => item.key === "client-ip")?.detail).toBe("203.0.113.10");
+  });
+
+  it("warns for a public HTTP endpoint", () => {
+    const result = evaluateConnectionSecurity({ ...baseInput, apiBaseUrl: "http://ctms.example.com/" });
+
+    expect(result.level).toBe("warning");
+    expect(result.checks.find((item) => item.key === "transport")?.detail).toBe("未使用 HTTPS");
+  });
+
+  it("marks an offline or expired session as abnormal", () => {
+    const result = evaluateConnectionSecurity({
+      ...baseInput,
+      status: "offline",
+      sessionDeadlineAt: Date.now() - 1_000,
+    });
+
+    expect(result.level).toBe("danger");
+    expect(result.label).toBe("异常");
+  });
+});
diff --git a/frontend/src/utils/connectionSecurity.ts b/frontend/src/utils/connectionSecurity.ts
new file mode 100644
index 00000000..8818c023
--- /dev/null
+++ b/frontend/src/utils/connectionSecurity.ts
@@ -0,0 +1,84 @@
+import type { ConnectionStatus } from "../composables/useConnectionStatus";
+
+export type ConnectionSecurityLevel = "safe" | "warning" | "danger";
+
+export type ConnectionSecurityCheck = {
+  key: "connection" | "transport" | "session" | "client-ip";
+  label: string;
+  detail: string;
+  level: ConnectionSecurityLevel;
+};
+
+export type ConnectionSecurityResult = {
+  level: ConnectionSecurityLevel;
+  label: "安全" | "需注意" | "异常";
+  checks: ConnectionSecurityCheck[];
+};
+
+const isLoopbackHost = (hostname: string) =>
+  hostname === "localhost" || hostname === "127.0.0.1" || hostname === "[::1]" || hostname === "::1";
+
+const resolveTransportCheck = (apiBaseUrl: string, pageOrigin: string): ConnectionSecurityCheck => {
+  try {
+    const target = new URL(apiBaseUrl || "/", pageOrigin);
+    if (target.protocol === "https:") {
+      return { key: "transport", label: "传输加密", detail: "HTTPS", level: "safe" };
+    }
+    if (isLoopbackHost(target.hostname)) {
+      return { key: "transport", label: "传输加密", detail: "HTTP（本地）", level: "safe" };
+    }
+    return { key: "transport", label: "传输加密", detail: "未使用 HTTPS", level: "warning" };
+  } catch {
+    return { key: "transport", label: "传输加密", detail: "无法识别服务地址", level: "warning" };
+  }
+};
+
+export const evaluateConnectionSecurity = (input: {
+  apiBaseUrl: string;
+  pageOrigin: string;
+  status: ConnectionStatus;
+  hasToken: boolean;
+  sessionDeadlineAt: number | null;
+  now: number;
+  clientIp: string | null;
+  latencyMs: number | null;
+  sessionRemainingLabel: string;
+}): ConnectionSecurityResult => {
+  const connectionCheck: ConnectionSecurityCheck = input.status === "online"
+    ? {
+        key: "connection",
+        label: "服务连接",
+        detail: input.latencyMs === null ? "在线" : `${input.latencyMs} ms`,
+        level: "safe",
+      }
+    : input.status === "offline"
+      ? { key: "connection", label: "服务连接", detail: "无法连接后端", level: "danger" }
+      : { key: "connection", label: "服务连接", detail: input.status === "checking" ? "正在检测" : "连接异常", level: "warning" };
+
+  const sessionValid = input.hasToken && (!input.sessionDeadlineAt || input.sessionDeadlineAt > input.now);
+  const sessionCheck: ConnectionSecurityCheck = sessionValid
+    ? { key: "session", label: "登录会话", detail: input.sessionRemainingLabel, level: "safe" }
+    : { key: "session", label: "登录会话", detail: "会话无效或已过期", level: "danger" };
+
+  const ipCheck: ConnectionSecurityCheck = input.clientIp
+    ? { key: "client-ip", label: "来源 IP", detail: input.clientIp, level: "safe" }
+    : { key: "client-ip", label: "来源 IP", detail: "暂未识别", level: "warning" };
+
+  const checks = [
+    connectionCheck,
+    resolveTransportCheck(input.apiBaseUrl, input.pageOrigin),
+    sessionCheck,
+    ipCheck,
+  ];
+  const level: ConnectionSecurityLevel = checks.some((item) => item.level === "danger")
+    ? "danger"
+    : checks.some((item) => item.level === "warning")
+      ? "warning"
+      : "safe";
+
+  return {
+    level,
+    label: level === "safe" ? "安全" : level === "warning" ? "需注意" : "异常",
+    checks,
+  };
+};
diff --git a/frontend/src/views/DesktopProjectEntry.test.ts b/frontend/src/views/DesktopProjectEntry.test.ts
index f639712a..a80e5956 100644
--- a/frontend/src/views/DesktopProjectEntry.test.ts
+++ b/frontend/src/views/DesktopProjectEntry.test.ts
@@ -13,9 +13,12 @@ describe("DesktopProjectEntry", () => {
     expect(source).toContain("Desktop Workbench");
     expect(source).toContain('class="entry-background-grid"');
     expect(source).toContain("系统管理");
-    expect(source).toContain("ADMIN SYSTEM");
-    expect(source).toContain("SYSTEM MANAGEMENT");
     expect(source).toContain("<strong>系统管理</strong>");
+    expect(source).toContain('class="admin-arrow"');
+    expect(source).toContain('loggingOut ? "正在退出" : "退出登录"');
+    expect(source).toContain('<AccountConnectionStatus mode="network" />');
+    expect(source).not.toContain("当前操作员");
+    expect(source).not.toContain('class="admin-desc"');
     expect(source).toContain('v-if="canEnterManagement"');
     expect(source).toContain('projects.value.some((project) => project.role_in_study === "PM")');
     expect(source).toContain("project-cards-grid");
diff --git a/frontend/src/views/DesktopProjectEntry.vue b/frontend/src/views/DesktopProjectEntry.vue
index 0b2811a6..bd0a31d1 100644
--- a/frontend/src/views/DesktopProjectEntry.vue
+++ b/frontend/src/views/DesktopProjectEntry.vue
@@ -20,40 +20,33 @@
             <span class="status-dot-active"></span>
           </div>
           <div class="account-details">
-            <small>当前操作员</small>
             <strong>{{ userDisplayName }}</strong>
             <span class="account-email">{{ auth.user?.email || "Operator" }}</span>
           </div>
-          
-          <button class="logout-btn" type="button" :disabled="loggingOut" @click="logout">
-            <el-icon><SwitchButton /></el-icon>
-            <span>{{ loggingOut ? "正在退出" : "注销账号" }}</span>
+        </div>
+
+        <!-- ADMIN / PM 可进入系统管理，其他角色仅可选择项目 -->
+        <div v-if="canEnterManagement" class="sidebar-admin">
+          <button class="admin-action-card" type="button" @click="enterManagement">
+            <div class="admin-card-head">
+              <div class="admin-icon-box">
+                <el-icon><Monitor /></el-icon>
+              </div>
+              <div class="admin-text-box">
+                <strong>系统管理</strong>
+              </div>
+              <el-icon class="admin-arrow"><ArrowRight /></el-icon>
+            </div>
           </button>
         </div>
+
+        <AccountConnectionStatus mode="network" />
       </div>
 
-      <!-- ADMIN / PM 可进入系统管理，其他角色仅可选择项目 -->
-      <div v-if="canEnterManagement" class="sidebar-admin">
-        <button class="admin-action-card" type="button" @click="enterManagement">
-          <span class="admin-glow-layer" aria-hidden="true"></span>
-          <div class="admin-card-head">
-            <div class="admin-icon-box">
-              <el-icon><Monitor /></el-icon>
-            </div>
-            <div class="admin-text-box">
-              <span class="admin-kicker">{{ isAdmin ? "ADMIN SYSTEM" : "SYSTEM MANAGEMENT" }}</span>
-              <strong>系统管理</strong>
-            </div>
-          </div>
-          <p class="admin-desc">
-            {{ isAdmin ? "人员账号管理、项目授权、审计及系统配置" : "查看并维护您负责项目的授权与范围配置" }}
-          </p>
-          <div class="admin-foot">
-            <span>进入控制台</span>
-            <el-icon><ArrowRight /></el-icon>
-          </div>
-        </button>
-      </div>
+      <button class="logout-btn" type="button" :disabled="loggingOut" @click="logout">
+        <el-icon><SwitchButton /></el-icon>
+        <span>{{ loggingOut ? "正在退出" : "退出登录" }}</span>
+      </button>
     </aside>
 
     <main class="entry-main">
@@ -163,6 +156,7 @@ import { useStudyStore } from "../store/study";
 import type { Study } from "../types/api";
 import { findFirstAccessibleProjectPath } from "../utils/projectRoutePermissions";
 import { isSystemAdmin } from "../utils/roles";
+import AccountConnectionStatus from "../components/AccountConnectionStatus.vue";
 
 const auth = useAuthStore();
 const studyStore = useStudyStore();
@@ -302,7 +296,7 @@ onMounted(() => {
   display: flex;
   align-items: center;
   gap: 14px;
-  margin-bottom: 48px;
+  margin-bottom: 30px;
 }
 
 .brand-mark {
@@ -335,11 +329,10 @@ onMounted(() => {
 /* 个人信息卡片（浅色拟物化） */
 .sidebar-account {
   display: flex;
-  flex-direction: column;
+  flex-direction: row;
   align-items: center;
-  text-align: center;
-  padding: 24px 20px;
-  border-radius: 16px;
+  padding: 16px;
+  border-radius: 14px;
   background: #ffffff;
   border: 1px solid rgba(226, 232, 240, 0.9);
   box-shadow: 0 4px 16px rgba(15, 23, 42, 0.02);
@@ -347,19 +340,20 @@ onMounted(() => {
 
 .avatar-wrapper {
   position: relative;
-  margin-bottom: 14px;
+  flex: 0 0 auto;
+  margin-right: 14px;
 }
 
 .account-avatar {
   display: inline-flex;
   align-items: center;
   justify-content: center;
-  width: 58px;
-  height: 58px;
-  border-radius: 14px;
+  width: 46px;
+  height: 46px;
+  border-radius: 12px;
   background: linear-gradient(135deg, #3b82f6 0%, #1e3a8a 100%);
   color: #ffffff;
-  font-size: 21px;
+  font-size: 18px;
   font-weight: 800;
   box-shadow: 0 8px 24px rgba(29, 78, 216, 0.15);
 }
@@ -378,29 +372,27 @@ onMounted(() => {
 .account-details {
   display: flex;
   flex-direction: column;
+  min-width: 0;
   width: 100%;
-  gap: 2px;
-  margin-bottom: 20px;
-}
-
-.account-details small {
-  color: #64748b;
-  font-size: 9.5px;
-  font-weight: 800;
-  letter-spacing: 0.05em;
-  text-transform: uppercase;
+  gap: 3px;
+  text-align: left;
 }
 
 .account-details strong {
   color: #0f172a;
-  font-size: 15px;
+  overflow: hidden;
+  font-size: 14.5px;
   font-weight: 700;
+  text-overflow: ellipsis;
+  white-space: nowrap;
 }
 
 .account-email {
   color: #475569;
   font-size: 11.5px;
-  word-break: break-all;
+  overflow: hidden;
+  text-overflow: ellipsis;
+  white-space: nowrap;
 }
 
 .logout-btn {
@@ -430,6 +422,7 @@ onMounted(() => {
 /* 常驻系统管理卡片（精致浅色流光） */
 .sidebar-admin {
   width: 100%;
+  margin-top: 14px;
 }
 
 .admin-action-card {
@@ -438,7 +431,7 @@ onMounted(() => {
   display: block;
   width: 100%;
   overflow: hidden;
-  padding: 18px;
+  padding: 14px 16px;
   border: 1px solid rgba(59, 130, 246, 0.12);
   border-radius: 12px;
   background: linear-gradient(135deg, #ffffff 0%, #f0f7ff 100%);
@@ -449,18 +442,6 @@ onMounted(() => {
   transition: all 0.25s cubic-bezier(0.16, 1, 0.3, 1);
 }
 
-.admin-glow-layer {
-  position: absolute;
-  top: -40px;
-  right: -40px;
-  width: 120px;
-  height: 120px;
-  border-radius: 50%;
-  background: rgba(59, 130, 246, 0.06);
-  filter: blur(15px);
-  pointer-events: none;
-}
-
 .admin-action-card:hover {
   transform: translateY(-2px);
   border-color: rgba(59, 130, 246, 0.28);
@@ -470,16 +451,15 @@ onMounted(() => {
 .admin-card-head {
   display: flex;
   align-items: center;
-  gap: 10px;
-  margin-bottom: 8px;
+  gap: 12px;
 }
 
 .admin-icon-box {
   display: inline-flex;
   align-items: center;
   justify-content: center;
-  width: 32px;
-  height: 32px;
+  width: 34px;
+  height: 34px;
   border-radius: 8px;
   background: rgba(59, 130, 246, 0.08);
   color: #2563eb;
@@ -489,44 +469,23 @@ onMounted(() => {
 .admin-text-box {
   display: flex;
   flex-direction: column;
-}
-
-.admin-kicker {
-  color: #2563eb;
-  font-size: 8.5px;
-  font-weight: 800;
-  letter-spacing: 0.05em;
-  text-transform: uppercase;
+  flex: 1;
 }
 
 .admin-text-box strong {
   color: #0f172a;
-  font-size: 13.5px;
+  font-size: 14.5px;
   font-weight: 700;
 }
 
-.admin-desc {
-  margin: 0 0 12px;
-  color: #475569;
-  font-size: 11px;
-  line-height: 1.4;
-}
-
-.admin-foot {
-  display: flex;
-  align-items: center;
-  justify-content: space-between;
+.admin-arrow {
+  margin-left: auto;
   color: #2563eb;
-  font-size: 11.5px;
-  font-weight: 700;
-}
-
-.admin-foot .el-icon {
-  font-size: 12px;
+  font-size: 14px;
   transition: transform 0.2s ease;
 }
 
-.admin-action-card:hover .admin-foot .el-icon {
+.admin-action-card:hover .admin-arrow {
   transform: translateX(2px);
 }
 
@@ -931,6 +890,11 @@ onMounted(() => {
   border-color: rgba(255, 255, 255, 0.02);
 }
 
+:global([data-ctms-theme="dark"] .account-details strong),
+:global([data-ctms-theme="dark"] .admin-text-box strong) {
+  color: #f8fafc;
+}
+
 :global([data-ctms-theme="dark"] .logout-btn) {
   border-color: rgba(255, 255, 255, 0.05);
   color: #94a3b8;
diff --git a/frontend/src/views/Login.test.ts b/frontend/src/views/Login.test.ts
index 35fbf779..9cd17bd4 100644
--- a/frontend/src/views/Login.test.ts
+++ b/frontend/src/views/Login.test.ts
@@ -103,6 +103,17 @@ describe("Login protocol agreement", () => {
     expect(source).toContain("max-width: calc(100vw - 40px);");
   });
 
+  it("keeps the login shell inside the viewport without a visible page scrollbar", () => {
+    const source = readLoginView();
+
+    expect(source).toContain("height: 100dvh;");
+    expect(source).toContain('document.body.classList.add("is-login-page")');
+    expect(source).toContain("scrollbar-width: none;");
+    expect(source).toContain(".login-wrapper::-webkit-scrollbar");
+    expect(source).toContain("overflow-y: auto;");
+    expect(source).toContain("@media (min-width: 961px) and (max-height: 820px)");
+  });
+
   it("falls back to full email input when no server-configured domains exist", () => {
     const source = readLoginView();
 
diff --git a/frontend/src/views/Login.vue b/frontend/src/views/Login.vue
index 4d08329c..fd5fb55f 100644
--- a/frontend/src/views/Login.vue
+++ b/frontend/src/views/Login.vue
@@ -410,6 +410,8 @@ const syncRememberedCredential = async () => {
 };
 
 onMounted(async () => {
+  document.documentElement.classList.add("is-login-page");
+  document.body.classList.add("is-login-page");
   window.addEventListener(DESKTOP_SERVER_URL_CHANGED_EVENT, refreshDesktopServerUrl);
   await loadEmailDomains();
   const reason = consumeLogoutReason();
@@ -426,6 +428,8 @@ onMounted(async () => {
 });
 
 onUnmounted(() => {
+  document.documentElement.classList.remove("is-login-page");
+  document.body.classList.remove("is-login-page");
   window.removeEventListener(DESKTOP_SERVER_URL_CHANGED_EVENT, refreshDesktopServerUrl);
 });
 
@@ -480,20 +484,39 @@ const onSubmit = async () => {
    ═══════════════════════ */
 .login-wrapper {
   position: relative;
+  width: 100%;
+  height: 100vh;
+  height: 100dvh;
   min-height: 100vh;
+  min-height: 100dvh;
   display: flex;
   align-items: stretch;
   justify-content: stretch;
   overflow: hidden;
+  scrollbar-width: none;
   background: #ffffff;
   font-family: "Inter", system-ui, -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, "Helvetica Neue", Arial, "PingFang SC", "Hiragino Sans GB", "Microsoft YaHei", "微软雅黑", sans-serif;
 }
 
+.login-wrapper::-webkit-scrollbar {
+  display: none;
+  width: 0;
+  height: 0;
+}
+
+:global(html.is-login-page),
+:global(body.is-login-page) {
+  height: 100%;
+  overflow: hidden;
+}
+
 .login-split-container {
   display: flex;
   min-width: 0;
-  width: 100vw;
-  min-height: 100vh;
+  width: 100%;
+  height: 100%;
+  min-height: 0;
+  overflow: hidden;
 }
 
 /* ═══════════════════════
@@ -502,6 +525,8 @@ const onSubmit = async () => {
 .login-left-brand {
   flex: 1;
   min-width: 0;
+  min-height: 0;
+  height: 100%;
   background: linear-gradient(135deg, #e0f2fe 0%, #e0e7ff 50%, #f3e8ff 100%);
   padding: 60px 80px;
   position: relative;
@@ -749,12 +774,15 @@ const onSubmit = async () => {
 .login-right-form {
   flex: 1;
   min-width: 0;
+  min-height: 0;
+  height: 100%;
   background: #ffffff;
   padding: 60px 80px;
   position: relative;
   display: flex;
   align-items: center;
   justify-content: center;
+  overflow: hidden;
 }
 
 /* 上方浏览器兼容建议 */
@@ -1404,4 +1432,115 @@ const onSubmit = async () => {
     margin-top: 32px;
   }
 }
+
+/* 统一收口：小屏允许触摸滚动，但不显示页面右侧滚动条。 */
+@media (max-width: 960px) {
+  .login-wrapper {
+    height: 100vh;
+    height: 100dvh;
+    min-height: 100vh;
+    min-height: 100dvh;
+    overflow-x: hidden;
+    overflow-y: auto;
+  }
+
+  .login-split-container {
+    height: auto;
+    min-height: 100vh;
+    min-height: 100dvh;
+    overflow: visible;
+  }
+
+  .login-right-form {
+    width: 100%;
+    height: auto;
+    min-height: 100vh;
+    min-height: 100dvh;
+    padding: clamp(20px, 5vh, 40px) clamp(16px, 6vw, 56px) 24px;
+    overflow: visible;
+  }
+
+  .login-card-container {
+    width: min(440px, 100%);
+    max-width: 100%;
+  }
+}
+
+/* 中等高度桌面窗口：压缩纵向间距，确保双栏始终锁在视口内。 */
+@media (min-width: 961px) and (max-height: 820px) {
+  .login-left-brand,
+  .login-right-form {
+    padding-top: clamp(24px, 3.5vh, 44px);
+    padding-bottom: clamp(24px, 3.5vh, 44px);
+  }
+
+  .brand-slogan-block {
+    margin-top: 20px;
+  }
+
+  .brand-main-title {
+    margin-bottom: 12px;
+    font-size: clamp(30px, 5vh, 36px);
+  }
+
+  .brand-features-grid {
+    gap: 10px;
+    margin: 20px 0;
+  }
+
+  .feature-card {
+    padding: 12px 16px;
+  }
+
+  .login-brand-header {
+    margin-bottom: 24px;
+  }
+
+  .login-tabs {
+    margin-bottom: 22px;
+  }
+
+  .login-form :deep(.el-form-item) {
+    margin-bottom: 14px;
+  }
+
+  .login-options {
+    margin-bottom: 18px;
+  }
+
+  .login-right-footer {
+    margin-top: 20px;
+    padding-top: 14px;
+    gap: 5px;
+  }
+}
+
+@media (max-width: 480px) and (max-height: 700px) {
+  .login-right-form {
+    padding-top: 16px;
+    padding-bottom: 16px;
+  }
+
+  .login-brand-header {
+    margin-bottom: 18px;
+  }
+
+  .login-tabs {
+    margin-bottom: 18px;
+  }
+
+  .login-form :deep(.el-form-item) {
+    margin-bottom: 14px;
+  }
+
+  .login-options {
+    gap: 6px;
+    margin-bottom: 18px;
+  }
+
+  .login-right-footer {
+    margin-top: 20px;
+    padding-top: 14px;
+  }
+}
 </style>
diff --git a/frontend/src/views/WebWorkbenchEntry.test.ts b/frontend/src/views/WebWorkbenchEntry.test.ts
index e58a702b..a5c953b3 100644
--- a/frontend/src/views/WebWorkbenchEntry.test.ts
+++ b/frontend/src/views/WebWorkbenchEntry.test.ts
@@ -19,6 +19,11 @@ describe("WebWorkbenchEntry", () => {
     expect(source).toContain('projects.value.some((project) => project.role_in_study === "PM")');
     expect(source).toContain('v-if="canEnterManagement"');
     expect(source).toContain('<strong>系统管理</strong>');
+    expect(source).toContain('class="admin-arrow"');
+    expect(source).toContain('loggingOut ? "正在退出" : "退出登录"');
+    expect(source).toContain('<AccountConnectionStatus mode="network" />');
+    expect(source).not.toContain("当前操作员");
+    expect(source).not.toContain('class="admin-desc"');
     expect(source).toContain('const managementActionLabel = computed(() => canEnterManagement.value ? "进入系统管理" : "");');
     expect(source).toContain("studyStore.clearCurrentStudy()");
     expect(source).toContain("studyStore.setCurrentStudy(pmProject)");
diff --git a/frontend/src/views/WebWorkbenchEntry.vue b/frontend/src/views/WebWorkbenchEntry.vue
index a148f328..528c193b 100644
--- a/frontend/src/views/WebWorkbenchEntry.vue
+++ b/frontend/src/views/WebWorkbenchEntry.vue
@@ -6,7 +6,7 @@
     <aside class="entry-sidebar">
       <div class="sidebar-top">
         <div class="sidebar-brand">
-          <div class="brand-mark"><span>CTMS</span></div>
+          <img class="brand-mark" src="/icons/ctms-icon-192.png" alt="" aria-hidden="true" />
           <div class="brand-text">
             <span class="brand-kicker">Web Workspace</span>
             <h1>工作台总控</h1>
@@ -20,40 +20,33 @@
             <span class="status-dot-active"></span>
           </div>
           <div class="account-details">
-            <small>当前操作员</small>
             <strong>{{ userDisplayName }}</strong>
             <span class="account-email">{{ auth.user?.email || "Operator" }}</span>
           </div>
+        </div>
 
-          <button class="logout-btn" type="button" :disabled="loggingOut" @click="logout">
-            <el-icon><SwitchButton /></el-icon>
-            <span>{{ loggingOut ? "正在退出" : "注销账号" }}</span>
+        <!-- ADMIN / PM 可进入系统管理，其他角色仅可选择项目 -->
+        <div v-if="canEnterManagement" class="sidebar-admin">
+          <button class="admin-action-card" type="button" @click="enterManagement">
+            <div class="admin-card-head">
+              <div class="admin-icon-box">
+                <el-icon><Monitor /></el-icon>
+              </div>
+              <div class="admin-text-box">
+                <strong>系统管理</strong>
+              </div>
+              <el-icon class="admin-arrow"><ArrowRight /></el-icon>
+            </div>
           </button>
         </div>
+
+        <AccountConnectionStatus mode="network" />
       </div>
 
-      <!-- ADMIN / PM 可进入系统管理，其他角色仅可选择项目 -->
-      <div v-if="canEnterManagement" class="sidebar-admin">
-        <button class="admin-action-card" type="button" @click="enterManagement">
-          <span class="admin-glow-layer" aria-hidden="true"></span>
-          <div class="admin-card-head">
-            <div class="admin-icon-box">
-              <el-icon><Monitor /></el-icon>
-            </div>
-            <div class="admin-text-box">
-              <span class="admin-kicker">{{ isAdmin ? "ADMIN SYSTEM" : "SYSTEM MANAGEMENT" }}</span>
-              <strong>系统管理</strong>
-            </div>
-          </div>
-          <p class="admin-desc">
-            {{ isAdmin ? "人员账号管理、项目授权、审计及系统配置" : "查看已授权研究项目的详细授权与范围配置" }}
-          </p>
-          <div class="admin-foot">
-            <span>进入控制台</span>
-            <el-icon><ArrowRight /></el-icon>
-          </div>
-        </button>
-      </div>
+      <button class="logout-btn" type="button" :disabled="loggingOut" @click="logout">
+        <el-icon><SwitchButton /></el-icon>
+        <span>{{ loggingOut ? "正在退出" : "退出登录" }}</span>
+      </button>
     </aside>
 
     <main class="entry-main">
@@ -158,7 +151,7 @@
 
       <!-- 空状态 -->
       <div v-else class="empty-project-workspace">
-        <div class="empty-icon-capsule"><span>CTMS</span></div>
+        <img class="empty-icon-capsule" src="/icons/ctms-icon-192.png" alt="" aria-hidden="true" />
         <h3>未检测到可用项目</h3>
         <p>您的账号尚未关联至任何研究项目，请联系系统管理员进行项目授权与分配。</p>
       </div>
@@ -168,7 +161,7 @@
     <div class="transition-overlay" :class="{ active: isTransitioning }" aria-hidden="true">
       <div class="overlay-glow"></div>
       <div class="overlay-spinner">
-        <span class="spinner-brand">CTMS</span>
+        <img class="spinner-brand" src="/icons/ctms-icon-192.png" alt="" aria-hidden="true" />
         <div class="spinner-ring"></div>
       </div>
     </div>
@@ -197,6 +190,7 @@ import { useStudyStore } from "../store/study";
 import type { Study } from "../types/api";
 import { findFirstAccessibleProjectPath } from "../utils/projectRoutePermissions";
 import { isSystemAdmin } from "../utils/roles";
+import AccountConnectionStatus from "../components/AccountConnectionStatus.vue";
 
 const auth = useAuthStore();
 const studyStore = useStudyStore();
@@ -343,22 +337,14 @@ onMounted(() => {
   display: flex;
   align-items: center;
   gap: 14px;
-  margin-bottom: 48px;
+  margin-bottom: 30px;
 }
 
 .brand-mark {
-  display: inline-flex;
-  align-items: center;
-  justify-content: center;
   width: 44px;
   height: 44px;
-  border: 1px solid rgba(59, 130, 246, 0.1);
   border-radius: 10px;
-  background: linear-gradient(135deg, #3b82f6 0%, #1d4ed8 100%);
-  color: #ffffff;
-  font-size: 13.5px;
-  font-weight: 900;
-  letter-spacing: 0.05em;
+  object-fit: cover;
   box-shadow: 0 8px 20px rgba(37, 99, 235, 0.18);
 }
 
@@ -382,11 +368,10 @@ onMounted(() => {
 /* 个人信息卡片（浅色拟物化） */
 .sidebar-account {
   display: flex;
-  flex-direction: column;
+  flex-direction: row;
   align-items: center;
-  text-align: center;
-  padding: 24px 20px;
-  border-radius: 16px;
+  padding: 16px;
+  border-radius: 14px;
   background: #ffffff;
   border: 1px solid rgba(226, 232, 240, 0.9);
   box-shadow: 0 4px 16px rgba(15, 23, 42, 0.02);
@@ -394,19 +379,20 @@ onMounted(() => {
 
 .avatar-wrapper {
   position: relative;
-  margin-bottom: 14px;
+  flex: 0 0 auto;
+  margin-right: 14px;
 }
 
 .account-avatar {
   display: inline-flex;
   align-items: center;
   justify-content: center;
-  width: 58px;
-  height: 58px;
-  border-radius: 14px;
+  width: 46px;
+  height: 46px;
+  border-radius: 12px;
   background: linear-gradient(135deg, #3b82f6 0%, #1e3a8a 100%);
   color: #ffffff;
-  font-size: 21px;
+  font-size: 18px;
   font-weight: 800;
   box-shadow: 0 8px 24px rgba(29, 78, 216, 0.15);
 }
@@ -425,29 +411,27 @@ onMounted(() => {
 .account-details {
   display: flex;
   flex-direction: column;
+  min-width: 0;
   width: 100%;
-  gap: 2px;
-  margin-bottom: 20px;
-}
-
-.account-details small {
-  color: #64748b;
-  font-size: 9.5px;
-  font-weight: 800;
-  letter-spacing: 0.05em;
-  text-transform: uppercase;
+  gap: 3px;
+  text-align: left;
 }
 
 .account-details strong {
   color: #0f172a;
-  font-size: 15px;
+  overflow: hidden;
+  font-size: 14.5px;
   font-weight: 700;
+  text-overflow: ellipsis;
+  white-space: nowrap;
 }
 
 .account-email {
   color: #475569;
   font-size: 11.5px;
-  word-break: break-all;
+  overflow: hidden;
+  text-overflow: ellipsis;
+  white-space: nowrap;
 }
 
 .logout-btn {
@@ -477,6 +461,7 @@ onMounted(() => {
 /* 常驻系统管理卡片（精致浅色流光） */
 .sidebar-admin {
   width: 100%;
+  margin-top: 14px;
 }
 
 .admin-action-card {
@@ -485,7 +470,7 @@ onMounted(() => {
   display: block;
   width: 100%;
   overflow: hidden;
-  padding: 18px;
+  padding: 14px 16px;
   border: 1px solid rgba(59, 130, 246, 0.12);
   border-radius: 12px;
   background: linear-gradient(135deg, #ffffff 0%, #f0f7ff 100%);
@@ -496,18 +481,6 @@ onMounted(() => {
   transition: all 0.25s cubic-bezier(0.16, 1, 0.3, 1);
 }
 
-.admin-glow-layer {
-  position: absolute;
-  top: -40px;
-  right: -40px;
-  width: 120px;
-  height: 120px;
-  border-radius: 50%;
-  background: rgba(59, 130, 246, 0.06);
-  filter: blur(15px);
-  pointer-events: none;
-}
-
 .admin-action-card:hover {
   transform: translateY(-2px);
   border-color: rgba(59, 130, 246, 0.28);
@@ -517,16 +490,15 @@ onMounted(() => {
 .admin-card-head {
   display: flex;
   align-items: center;
-  gap: 10px;
-  margin-bottom: 8px;
+  gap: 12px;
 }
 
 .admin-icon-box {
   display: inline-flex;
   align-items: center;
   justify-content: center;
-  width: 32px;
-  height: 32px;
+  width: 34px;
+  height: 34px;
   border-radius: 8px;
   background: rgba(59, 130, 246, 0.08);
   color: #2563eb;
@@ -536,44 +508,23 @@ onMounted(() => {
 .admin-text-box {
   display: flex;
   flex-direction: column;
-}
-
-.admin-kicker {
-  color: #2563eb;
-  font-size: 8.5px;
-  font-weight: 800;
-  letter-spacing: 0.05em;
-  text-transform: uppercase;
+  flex: 1;
 }
 
 .admin-text-box strong {
   color: #0f172a;
-  font-size: 13.5px;
+  font-size: 14.5px;
   font-weight: 700;
 }
 
-.admin-desc {
-  margin: 0 0 12px;
-  color: #475569;
-  font-size: 11px;
-  line-height: 1.4;
-}
-
-.admin-foot {
-  display: flex;
-  align-items: center;
-  justify-content: space-between;
+.admin-arrow {
+  margin-left: auto;
   color: #2563eb;
-  font-size: 11.5px;
-  font-weight: 700;
-}
-
-.admin-foot .el-icon {
-  font-size: 12px;
+  font-size: 14px;
   transition: transform 0.2s ease;
 }
 
-.admin-action-card:hover .admin-foot .el-icon {
+.admin-action-card:hover .admin-arrow {
   transform: translateX(2px);
 }
 
@@ -895,17 +846,10 @@ onMounted(() => {
 }
 
 .empty-icon-capsule {
-  display: inline-flex;
-  align-items: center;
-  justify-content: center;
   width: 42px;
   height: 42px;
   border-radius: 8px;
-  background: #eff6ff;
-  color: #2563eb;
-  font-size: 11px;
-  font-weight: 800;
-  letter-spacing: 0.05em;
+  object-fit: cover;
   margin-bottom: 12px;
 }
 
@@ -1006,6 +950,11 @@ onMounted(() => {
   border-color: rgba(255, 255, 255, 0.02);
 }
 
+:global([data-ctms-theme="dark"] .account-details strong),
+:global([data-ctms-theme="dark"] .admin-text-box strong) {
+  color: #f8fafc;
+}
+
 :global([data-ctms-theme="dark"] .logout-btn) {
   border-color: rgba(255, 255, 255, 0.05);
   color: #94a3b8;
@@ -1153,11 +1102,11 @@ onMounted(() => {
 }
 
 .spinner-brand {
-  color: #ffffff;
-  font-size: 15px;
-  font-weight: 900;
-  letter-spacing: 0.1em;
-  text-shadow: 0 0 12px rgba(59, 130, 246, 0.4);
+  width: 52px;
+  height: 52px;
+  border-radius: 12px;
+  object-fit: cover;
+  filter: drop-shadow(0 0 12px rgba(59, 130, 246, 0.4));
   animation: pulseBrand 1.4s ease-in-out infinite alternate;
 }
 
@@ -1213,26 +1162,19 @@ onMounted(() => {
   }
 
   .sidebar-account {
-    flex-direction: row;
-    align-items: center;
-    justify-content: space-between;
     padding: 16px;
-    text-align: left;
   }
 
   .avatar-wrapper {
-    margin-bottom: 0;
+    margin-right: 12px;
   }
 
   .account-details {
-    margin-bottom: 0;
-    align-items: flex-start;
-    flex: 1;
-    margin-left: 12px;
+    margin-left: 0;
   }
 
   .logout-btn {
-    width: auto;
+    width: 100%;
     padding: 0 16px;
   }