diff --git a/frontend/src/views/Dashboard/Dashboard.test.js b/frontend/src/views/Dashboard/Dashboard.test.js
index 794e4ed..aa4b675 100644
--- a/frontend/src/views/Dashboard/Dashboard.test.js
+++ b/frontend/src/views/Dashboard/Dashboard.test.js
@@ -1,9 +1,121 @@
 import assert from "node:assert/strict";
 import test from "node:test";
-import { nextTick } from "vue";
+import { nextTick, ref } from "vue";
 import { useDashboard } from "./Dashboard.js";
+import { useDashboardNavigation } from "./DashboardNavigation.js";
 import { aliyunProvider, deferred, mountComposable, verifiedResponse } from "../../test-support/mount.js";
 
+test("板块导航默认只选中基本信息，超级管理员可切换全部板块", () => {
+  const navigation = useDashboardNavigation(ref({ role: "super_admin" }));
+  assert.equal(navigation.activeSection.value, "overview");
+  assert.equal(navigation.sections.value.length, 6);
+  for (const section of navigation.sections.value) {
+    navigation.selectSection(section.id);
+    assert.equal(navigation.activeSection.value, section.id);
+    assert.equal(navigation.activeLabel.value, section.label);
+  }
+  navigation.selectSection("invalid");
+  assert.equal(navigation.activeSection.value, "users");
+});
+
+test("用户管理导航按权限显示，权限变化后回到基本信息", () => {
+  const user = ref(null);
+  const navigation = useDashboardNavigation(user);
+  assert.equal(navigation.sections.value.some((section) => section.id === "users"), false);
+  navigation.selectSection("users");
+  assert.equal(navigation.activeSection.value, "overview");
+  user.value = { role: "super_admin" };
+  navigation.selectSection("users");
+  assert.equal(navigation.activeSection.value, "users");
+  user.value = { role: "admin" };
+  assert.equal(navigation.activeSection.value, "overview");
+  assert.equal(navigation.sections.value.length, 5);
+});
+
+test("单板块布局使用互斥条件，切换重置滚动且保留弹窗入口", async () => {
+  const { readFile } = await import("node:fs/promises");
+  const template = await readFile(new URL("./Dashboard.vue", import.meta.url), "utf8");
+  const stylesheet = await readFile(new URL("./DashboardLayout.css", import.meta.url), "utf8");
+  for (const id of ["overview", "activity", "domains", "servers", "keys", "users"]) {
+    assert.ok(template.includes(`v-if="activeSection === '${id}'"`));
+  }
+  assert.match(template, /:key="activeSection"/);
+  assert.match(template, /role="region"\s+:aria-label="activeLabel"\s+tabindex="0"/);
+  for (const modal of ["SettingsModal", "DomainModal", "ServerModal", "SSHKeyModal"]) {
+    assert.ok(template.includes(`<${modal} v-if=`));
+  }
+  assert.match(stylesheet, /height: 100dvh/);
+  assert.match(stylesheet, /\.dashboard-content\s*\{[^}]*overflow: auto/);
+});
+
+test("侧栏支持键盘焦点、当前项标记和悬浮说明", async () => {
+  const { readFile } = await import("node:fs/promises");
+  const template = await readFile(new URL("./DashboardNavigation.vue", import.meta.url), "utf8");
+  const stylesheet = await readFile(new URL("./DashboardNavigation.css", import.meta.url), "utf8");
+  assert.match(template, /<button/);
+  assert.match(template, /:aria-current=/);
+  assert.match(template, /:title="section.hint"/);
+  assert.match(stylesheet, /\.navigation-item:focus-visible/);
+});
+
+test("证书导入使用组合式状态导出，避免点击时缺失处理函数", async () => {
+  const { readFile } = await import("node:fs/promises");
+  const template = await readFile(new URL("./Dashboard.vue", import.meta.url), "utf8");
+  const script = template.split("</script>")[0];
+  for (const name of ["showCertificateImport", "openCertificateImport", "closeCertificateImport", "importCertificate", "selectCertificateImportFile"]) {
+    assert.ok(script.includes(`  ${name},`));
+  }
+});
+test("完整页面逐个渲染六个板块，每次只有一个内容标题", async (t) => {
+  const { readFile } = await import("node:fs/promises");
+  const { parse, compileTemplate } = await import("@vue/compiler-sfc");
+  const { renderToString } = await import("@vue/server-renderer");
+  const Vue = await import("vue");
+  const source = await readFile(new URL("./Dashboard.vue", import.meta.url), "utf8");
+  const { descriptor, errors } = parse(source);
+  assert.deepEqual(errors, []);
+  const compiled = compileTemplate({
+    source: descriptor.template.content,
+    filename: "Dashboard.vue",
+    id: "dashboard-panels",
+    compilerOptions: { mode: "function" },
+  });
+  assert.deepEqual(compiled.errors, []);
+  const render = new Function("Vue", compiled.code)(Vue);
+  const { state } = await setup(t, () => verifiedResponse());
+  state.closeSettings();
+  state.currentUser.value = { account: "test-admin", role: "super_admin" };
+  const navigation = useDashboardNavigation(state.currentUser);
+  const headings = {
+    overview: "基本信息",
+    activity: "最近活动",
+    domains: "托管域名",
+    servers: "部署服务器",
+    keys: "SSH 私钥",
+    users: "用户管理",
+  };
+  for (const section of navigation.sections.value) {
+    navigation.selectSection(section.id);
+    const app = Vue.createSSRApp({
+      render,
+      setup: () => ({ ...state, ...navigation, dashboard: state }),
+    });
+    for (const name of ["ChangePassword", "DashboardNavigation", "SettingsModal", "DomainModal", "ServerModal", "SSHKeyModal"]) {
+      app.component(name, { render: () => null });
+    }
+    app.component("UserManagement", { render: () => Vue.h("h2", headings.users) });
+    const warnings = [];
+    app.config.warnHandler = (message) => warnings.push(message);
+    const html = await renderToString(app);
+    assert.deepEqual([...html.matchAll(/<h2>(.*?)<\/h2>/g)].map((match) => match[1]), [headings[section.id]]);
+    assert.deepEqual(warnings, []);
+    if (section.id === "overview") {
+      assert.match(html, /test-admin/);
+      assert.doesNotMatch(html, /立即检查续期/);
+    }
+  }
+});
+
 async function setup(t, request) {
   const mounted = await mountComposable(t, useDashboard, async (path) => {
     if (path === "/api/v1/dns/test") return request();
diff --git a/frontend/src/views/Dashboard/Dashboard.vue b/frontend/src/views/Dashboard/Dashboard.vue
index 96e1cfa..1a27a49 100644
--- a/frontend/src/views/Dashboard/Dashboard.vue
+++ b/frontend/src/views/Dashboard/Dashboard.vue
@@ -5,6 +5,8 @@ import SettingsModal from "./SettingsModal.vue";
 import DomainModal from "./DomainModal.vue";
 import ServerModal from "./ServerModal.vue";
 import SSHKeyModal from "./SSHKeyModal.vue";
+import DashboardNavigation from "./DashboardNavigation.vue";
+import { useDashboardNavigation } from "./DashboardNavigation.js";
 import { useDashboard } from "./Dashboard.js";
 
 const dashboard = useDashboard();
@@ -59,6 +61,15 @@ const {
   sshKeyPrivatePath,
   sshKeyPublicPath,
   showSettings,
+  showCertificateImport,
+  importDomain,
+  importSaving,
+  importError,
+  importResult,
+  openCertificateImport,
+  closeCertificateImport,
+  selectCertificateImportFile,
+  importCertificate,
   settingsSaving,
   settingsError,
   dnsProviderCatalog,
@@ -113,6 +124,7 @@ const {
   daysRemaining,
   statusClass,
 } = dashboard;
+const { activeSection, activeLabel, sections, selectSection } = useDashboardNavigation(currentUser);
 </script>
 
 <template>
@@ -127,7 +139,7 @@ const {
         <button class="secondary-button" type="button" @click="loadData">
           刷新状态
         </button>
-        <button class="secondary-button" type="button" @click="runRenewalNow">
+        <button v-if="activeSection === 'activity'" class="secondary-button" type="button" @click="runRenewalNow">
           立即检查续期
         </button>
         <button class="secondary-button" type="button" @click="openSettings">
@@ -137,6 +149,7 @@ const {
           class="secondary-button"
           type="button"
           @click="openSSHKeyCreate"
+          v-if="activeSection === 'keys'"
         >
           添加 SSH 私钥
         </button>
@@ -144,17 +157,35 @@ const {
           class="secondary-button"
           type="button"
           @click="openServerCreate"
+          v-if="activeSection === 'servers'"
         >
           添加服务器
         </button>
-        <button class="primary-button" type="button" @click="openCreate">
+        <button v-if="activeSection === 'domains'" class="primary-button" type="button" @click="openCreate">
           添加域名
         </button>
       </div>
     </header>
 
-    <p v-if="error" class="error-banner">{{ error }}</p>
-    <p v-if="notice" class="notice-banner">{{ notice }}</p>
+    <div class="dashboard-messages" aria-live="polite">
+      <p v-if="error" class="error-banner">{{ error }}</p>
+      <p v-if="notice" class="notice-banner">{{ notice }}</p>
+    </div>
+
+    <div class="dashboard-workspace">
+      <DashboardNavigation
+        :active-section="activeSection"
+        :sections="sections"
+        @select="selectSection"
+      />
+      <div
+        :key="activeSection"
+        class="dashboard-content"
+        role="region"
+        :aria-label="activeLabel"
+        tabindex="0"
+      >
+    <div v-if="activeSection === 'overview'" class="overview-section">
 
     <section class="panel overview-panel">
       <div class="panel-heading">
@@ -241,9 +272,11 @@ const {
       </article>
     </section>
 
-    <UserManagement />
+    </div>
 
-    <section class="panel operations-panel">
+    <UserManagement v-if="activeSection === 'users'" />
+
+    <section v-if="activeSection === 'activity'" class="panel operations-panel">
       <div class="panel-heading">
         <div>
           <p class="eyebrow">运行概览</p>
@@ -312,7 +345,7 @@ const {
       </div>
     </section>
 
-    <section class="panel">
+    <section v-if="activeSection === 'domains'" class="panel">
       <div class="panel-heading">
         <div>
           <p class="eyebrow">域名配置</p>
@@ -388,7 +421,7 @@ const {
       </div>
     </section>
 
-    <section class="panel server-panel">
+    <section v-if="activeSection === 'keys'" class="panel server-panel">
       <div class="panel-heading">
         <div>
           <p class="eyebrow">安全凭据</p>
@@ -429,7 +462,7 @@ const {
       </div>
     </section>
 
-    <section class="panel server-panel">
+    <section v-if="activeSection === 'servers'" class="panel server-panel">
       <div class="panel-heading">
         <div>
           <p class="eyebrow">远程部署</p>
@@ -476,6 +509,9 @@ const {
       </div>
     </section>
 
+      </div>
+    </div>
+
     <SettingsModal v-if="showSettings" :state="dashboard" />
 
 
@@ -568,3 +604,4 @@ const {
   </main>
 </template>
 <style scoped src="./Dashboard.css"></style>
+<style scoped src="./DashboardLayout.css"></style>
diff --git a/frontend/src/views/Dashboard/DashboardLayout.css b/frontend/src/views/Dashboard/DashboardLayout.css
new file mode 100644
index 0000000..83a87e0
--- /dev/null
+++ b/frontend/src/views/Dashboard/DashboardLayout.css
@@ -0,0 +1,213 @@
+.page-shell {
+  display: grid;
+  grid-template-rows: auto auto minmax(0, 1fr);
+  gap: 16px;
+  width: 100%;
+  max-width: 1600px;
+  height: 100dvh;
+  padding: 24px;
+  overflow: hidden;
+}
+
+.topbar {
+  gap: 16px;
+}
+
+.topbar h1 {
+  font-size: 26px;
+  letter-spacing: -0.03em;
+}
+
+.topbar .eyebrow {
+  margin-bottom: 6px;
+}
+
+.topbar-actions {
+  gap: 8px;
+}
+
+.topbar-actions > button {
+  padding: 9px 13px;
+  font-size: 13px;
+}
+
+.dashboard-messages:empty {
+  display: none;
+}
+
+.page-shell:not(:has(.dashboard-messages > p)) {
+  grid-template-rows: auto minmax(0, 1fr);
+}
+
+.dashboard-messages p {
+  margin: 0;
+}
+
+.dashboard-messages p + p {
+  margin-top: 8px;
+}
+
+.dashboard-workspace {
+  display: grid;
+  grid-template-columns: 208px minmax(0, 1fr);
+  gap: 18px;
+  min-height: 0;
+}
+
+.dashboard-content {
+  min-width: 0;
+  min-height: 0;
+  overflow: auto;
+  overscroll-behavior: contain;
+  scrollbar-gutter: stable;
+  border-radius: 18px;
+}
+
+.dashboard-content:focus-visible {
+  outline: 2px solid #315aaa;
+  outline-offset: -2px;
+}
+
+.dashboard-content > .panel,
+.dashboard-content :deep(.user-management) {
+  margin: 0;
+  min-height: 100%;
+  padding: 24px;
+  border-radius: 18px;
+}
+
+.overview-section {
+  display: flex;
+  flex-direction: column;
+  gap: 16px;
+  min-height: 100%;
+}
+
+.overview-section > .overview-panel {
+  flex: 1;
+  margin: 0;
+  padding: 24px;
+}
+
+.overview-section > .metrics-grid {
+  margin: 0;
+}
+
+.metric-card {
+  padding: 16px 18px;
+  border-radius: 14px;
+}
+
+.metric-card strong {
+  margin-top: 8px;
+  font-size: 20px;
+  overflow-wrap: anywhere;
+}
+
+.panel-heading h2 {
+  font-size: 22px;
+}
+
+.overview-summary-card strong {
+  font-size: 18px;
+}
+
+.overview-status {
+  white-space: normal;
+}
+
+.domain-row {
+  grid-template-columns: minmax(0, 1fr) auto;
+  gap: 14px;
+}
+
+.domain-row .row-actions {
+  grid-column: 1 / -1;
+  justify-content: flex-end;
+  flex-wrap: wrap;
+}
+
+.domain-main,
+.domain-meta,
+.domain-expiry {
+  min-width: 0;
+  overflow-wrap: anywhere;
+}
+
+.record-list {
+  max-height: max(240px, calc(100dvh - 300px));
+}
+
+@media (max-width: 1100px) {
+  .dashboard-workspace {
+    grid-template-columns: 180px minmax(0, 1fr);
+    gap: 14px;
+  }
+
+  .operation-columns {
+    grid-template-columns: 1fr;
+  }
+
+  .record-list {
+    max-height: 260px;
+  }
+
+  .overview-summary-grid {
+    grid-template-columns: repeat(2, minmax(0, 1fr));
+  }
+
+  .overview-summary-card:last-child {
+    grid-column: 1 / -1;
+  }
+
+  .overview-domain-row {
+    grid-template-columns: repeat(2, minmax(0, 1fr));
+  }
+
+  .overview-domain-main {
+    grid-column: 1 / -1;
+  }
+}
+
+@media (max-width: 760px) {
+  .page-shell {
+    display: flex;
+    flex-direction: column;
+    height: auto;
+    min-height: 100dvh;
+    padding: 16px;
+    overflow: visible;
+  }
+
+  .topbar {
+    align-items: flex-start;
+    flex-direction: column;
+  }
+
+  .topbar-actions {
+    justify-content: flex-start;
+  }
+
+  .dashboard-workspace {
+    grid-template-columns: 1fr;
+  }
+
+  .dashboard-content {
+    overflow: visible;
+  }
+
+  .dashboard-content > .panel,
+  .dashboard-content :deep(.user-management),
+  .overview-section > .overview-panel {
+    padding: 18px;
+  }
+
+  .overview-summary-grid,
+  .overview-domain-row {
+    grid-template-columns: 1fr;
+  }
+
+  .metrics-grid {
+    grid-template-columns: repeat(2, minmax(0, 1fr));
+  }
+}
diff --git a/frontend/src/views/Dashboard/DashboardNavigation.css b/frontend/src/views/Dashboard/DashboardNavigation.css
new file mode 100644
index 0000000..a0c1b86
--- /dev/null
+++ b/frontend/src/views/Dashboard/DashboardNavigation.css
@@ -0,0 +1,118 @@
+.dashboard-navigation {
+  display: flex;
+  flex-direction: column;
+  gap: 5px;
+  min-height: 0;
+  overflow-y: auto;
+  padding: 22px 12px 14px;
+  border: 1px solid #e2e8f2;
+  border-radius: 18px;
+  background: #fff;
+}
+
+.navigation-heading {
+  display: flex;
+  align-items: center;
+  gap: 10px;
+  padding: 0 10px 18px;
+}
+
+.navigation-heading div {
+  display: grid;
+  gap: 4px;
+}
+
+.navigation-heading strong {
+  color: #263752;
+  font-size: 19px;
+}
+
+.navigation-heading span,
+.navigation-group,
+.navigation-footer {
+  color: #7a879d;
+  font-size: 11px;
+}
+
+.navigation-group {
+  margin: 14px 12px 4px;
+}
+
+.navigation-item {
+  display: flex;
+  align-items: center;
+  gap: 11px;
+  width: 100%;
+  min-height: 43px;
+  padding: 10px 12px;
+  border: 1px solid transparent;
+  border-radius: 10px;
+  background: transparent;
+  color: #62718a;
+  font: inherit;
+  font-size: 13px;
+  text-align: left;
+  cursor: pointer;
+}
+
+.navigation-item:hover {
+  background: #f5f7fb;
+  color: #315aaa;
+}
+
+.navigation-item.active {
+  border-color: #dce6f6;
+  background: #edf3fc;
+  color: #315aaa;
+  font-weight: 700;
+}
+
+.navigation-item:focus-visible {
+  outline: 2px solid #315aaa;
+  outline-offset: 2px;
+}
+
+.navigation-item svg {
+  flex: none;
+  width: 18px;
+  height: 18px;
+  stroke: currentColor;
+  stroke-width: 1.6;
+  stroke-linecap: round;
+  stroke-linejoin: round;
+}
+
+.navigation-current {
+  width: 5px;
+  height: 5px;
+  margin-left: auto;
+  border-radius: 50%;
+  background: currentColor;
+}
+
+.navigation-footer {
+  margin: auto 12px 0;
+  padding-top: 28px;
+}
+
+@media (max-width: 760px) {
+  .dashboard-navigation {
+    flex-direction: row;
+    flex-wrap: wrap;
+    gap: 6px;
+    padding: 10px;
+    overflow: visible;
+  }
+
+  .navigation-heading,
+  .navigation-group,
+  .navigation-footer {
+    display: none;
+  }
+
+  .navigation-item {
+    width: auto;
+    min-height: 38px;
+    padding: 8px 10px;
+  }
+}
diff --git a/frontend/src/views/Dashboard/DashboardNavigation.js b/frontend/src/views/Dashboard/DashboardNavigation.js
new file mode 100644
index 0000000..cc3562c
--- /dev/null
+++ b/frontend/src/views/Dashboard/DashboardNavigation.js
@@ -0,0 +1,31 @@
+import { computed, ref } from "vue";
+
+export const dashboardSections = [
+  { id: "overview", label: "基本信息", group: "总览", hint: "查看用户、域名状态、证书到期时间和部署服务器" },
+  { id: "activity", label: "运行概览", group: "总览", hint: "查看证书、任务与审计日志" },
+  { id: "domains", label: "域名配置", group: "证书与部署", hint: "管理域名、申请证书和执行部署" },
+  { id: "servers", label: "部署服务器", group: "证书与部署", hint: "配置部署目标及 SSH 认证方式" },
+  { id: "keys", label: "SSH 私钥", group: "证书与部署", hint: "管理加密保存的 SSH 私钥" },
+  { id: "users", label: "用户管理", group: "系统管理", hint: "管理登录账号、角色与使用状态" },
+];
+
+export function useDashboardNavigation(currentUser) {
+  const selectedSection = ref("overview");
+  const sections = computed(() => dashboardSections.filter(
+    (section) => section.id !== "users" || currentUser.value?.role === "super_admin",
+  ));
+  const activeSection = computed(() => sections.value.some(
+    (section) => section.id === selectedSection.value,
+  ) ? selectedSection.value : "overview");
+  const activeLabel = computed(() => sections.value.find(
+    (section) => section.id === activeSection.value,
+  )?.label || dashboardSections[0].label);
+
+  function selectSection(id) {
+    if (sections.value.some((section) => section.id === id)) {
+      selectedSection.value = id;
+    }
+  }
+
+  return { activeSection, activeLabel, sections, selectSection };
+}
diff --git a/frontend/src/views/Dashboard/DashboardNavigation.vue b/frontend/src/views/Dashboard/DashboardNavigation.vue
new file mode 100644
index 0000000..e76df05
--- /dev/null
+++ b/frontend/src/views/Dashboard/DashboardNavigation.vue
@@ -0,0 +1,62 @@
+<script setup>
+defineProps({
+  activeSection: { type: String, required: true },
+  sections: { type: Array, required: true },
+});
+
+defineEmits(["select"]);
+</script>
+
+<template>
+  <nav class="dashboard-navigation" aria-label="管理板块">
+    <div class="navigation-heading">
+      <img src="/Scert.png" alt="" width="32" height="32" />
+      <div>
+        <strong>Scert</strong>
+        <span>证书管理控制台</span>
+      </div>
+    </div>
+    <template v-for="(section, index) in sections" :key="section.id">
+      <p v-if="index === 0 || sections[index - 1].group !== section.group" class="navigation-group">
+        {{ section.group }}
+      </p>
+      <button
+        :id="`navigation-${section.id}`"
+        class="navigation-item"
+        :class="{ active: activeSection === section.id }"
+        :aria-current="activeSection === section.id ? 'page' : undefined"
+        :title="section.hint"
+        type="button"
+        @click="$emit('select', section.id)"
+      >
+        <svg viewBox="0 0 24 24" fill="none" aria-hidden="true">
+          <path v-if="section.id === 'overview'" d="m3 10 9-7 9 7v10H3V10Zm6 10v-7h6v7" />
+          <path v-else-if="section.id === 'activity'" d="M3 12h4l3-8 4 16 3-8h4" />
+          <g v-else-if="section.id === 'domains'">
+            <circle cx="12" cy="12" r="9" />
+            <ellipse cx="12" cy="12" rx="4" ry="9" />
+            <path d="M3 12h18" />
+          </g>
+          <g v-else-if="section.id === 'servers'">
+            <rect x="3" y="3" width="18" height="7" rx="2" />
+            <rect x="3" y="14" width="18" height="7" rx="2" />
+            <path d="M7 6.5h.01M7 17.5h.01M12 6.5h5M12 17.5h5" />
+          </g>
+          <g v-else-if="section.id === 'keys'">
+            <circle cx="8" cy="8" r="5" />
+            <path d="m12 12 9 9m-6-6 3-3m0 6 3-3" />
+          </g>
+          <g v-else>
+            <circle cx="12" cy="8" r="4" />
+            <path d="M4 21v-2a8 8 0 0 1 16 0v2" />
+          </g>
+        </svg>
+        <span>{{ section.label }}</span>
+        <i v-if="activeSection === section.id" class="navigation-current" aria-hidden="true"></i>
+      </button>
+    </template>
+    <p class="navigation-footer">SSL 证书管理</p>
+  </nav>
+</template>
+
+<style scoped src="./DashboardNavigation.css"></style>