diff --git a/frontend/src/layouts/DashboardLayout.vue b/frontend/src/layouts/DashboardLayout.vue
index 8d530c2..61087d6 100644
--- a/frontend/src/layouts/DashboardLayout.vue
+++ b/frontend/src/layouts/DashboardLayout.vue
@@ -19,13 +19,18 @@ const avatarUrl = computed(
     `https://ui-avatars.com/api/?name=${encodeURIComponent(displayName.value)}&background=6366f1&color=fff`,
 )
 
-const navItems = [
-  { name: '全局热点池', icon: 'fa-solid fa-fire', route: '/' },
-  { name: '事件追溯分析', icon: 'fa-solid fa-chart-line', route: '/search' },
-  { name: '公关修改追踪', icon: 'fa-solid fa-mask', route: '/revisions' },
-  { name: '我的泛订阅', icon: 'fa-solid fa-rss', route: '/topics' },
-  { name: 'AI 简报设置', icon: 'fa-solid fa-paper-plane', route: '/delivery' },
-]
+const navItems = computed(() => {
+  const items = [
+    { name: '全局热点池', icon: 'fa-solid fa-fire', route: '/' },
+    { name: '事件追溯分析', icon: 'fa-solid fa-chart-line', route: '/search' },
+    { name: '公关修改追踪', icon: 'fa-solid fa-mask', route: '/revisions' },
+  ]
+  if (authStore.isAuthenticated) {
+    items.push({ name: '我的泛订阅', icon: 'fa-solid fa-rss', route: '/topics' })
+    items.push({ name: 'AI 简报设置', icon: 'fa-solid fa-paper-plane', route: '/delivery' })
+  }
+  return items
+})
 
 function isActive(path: string) {
   return route.path === path
@@ -72,7 +77,7 @@ function toggleSidebar() {
       </div>
 
       <!-- 用户信息 -->
-      <div class="sidebar-user">
+      <div class="sidebar-user" v-if="authStore.isAuthenticated">
         <img :src="avatarUrl" class="user-avatar" alt="头像" />
         <div class="user-info">
           <p class="user-name">{{ displayName }}</p>
@@ -85,6 +90,18 @@ function toggleSidebar() {
           <i class="fa-solid fa-right-from-bracket"></i>
         </button>
       </div>
+      <div class="sidebar-user guest-user" v-else>
+        <div class="user-info">
+          <p class="user-name">游客，您好</p>
+          <p class="user-status guest">
+            <span class="status-dot gray"></span>
+            未登录
+          </p>
+        </div>
+        <button class="login-btn" title="前往登录" @click="router.push('/login')">
+          <i class="fa-solid fa-arrow-right-to-bracket"></i>
+        </button>
+      </div>
     </aside>
 
     <!-- 主内容区 -->
@@ -240,6 +257,10 @@ function toggleSidebar() {
   gap: 4px;
 }
 
+.user-status.guest {
+  color: var(--text-placeholder);
+}
+
 .status-dot {
   width: 6px;
   height: 6px;
@@ -249,17 +270,25 @@ function toggleSidebar() {
   animation: pulse-dot 2s infinite;
 }
 
+.status-dot.gray {
+  background: var(--text-placeholder);
+  animation: none;
+}
+
 @keyframes pulse-dot {
   0%, 100% { opacity: 1; }
   50% { opacity: 0.4; }
 }
 
-.logout-btn {
+.logout-btn, .login-btn {
   color: var(--text-secondary);
   padding: 8px;
   border-radius: var(--radius-md);
   font-size: 14px;
   transition: all 0.2s;
+  cursor: pointer;
+  background: transparent;
+  border: none;
 }
 
 .logout-btn:hover {
@@ -267,6 +296,11 @@ function toggleSidebar() {
   background: rgba(239, 68, 68, 0.1);
 }
 
+.login-btn:hover {
+  color: var(--brand-primary);
+  background: var(--brand-primary-alpha);
+}
+
 /* ==========================================
    主内容区
 ========================================== */
diff --git a/frontend/src/router/index.ts b/frontend/src/router/index.ts
index f56b875..5e9ebcd 100644
--- a/frontend/src/router/index.ts
+++ b/frontend/src/router/index.ts
@@ -30,7 +30,6 @@ const router = createRouter({
     {
       path: '/',
       component: DashboardLayout,
-      meta: { requiresAuth: true },
       children: [
         {
           path: '',
@@ -46,11 +45,13 @@ const router = createRouter({
           path: 'topics',
           name: 'topics',
           component: () => import('@/views/TopicsView.vue'),
+          meta: { requiresAuth: true },
         },
         {
           path: 'delivery',
           name: 'delivery',
           component: () => import('@/views/DeliveryView.vue'),
+          meta: { requiresAuth: true },
         },
         {
           path: 'search',
diff --git a/frontend/src/views/DashboardView.vue b/frontend/src/views/DashboardView.vue
index 36d3307..d7521e9 100644
--- a/frontend/src/views/DashboardView.vue
+++ b/frontend/src/views/DashboardView.vue
@@ -68,7 +68,7 @@ const minHot = ref(savedThreshold !== null ? Number(savedThreshold) : 3)
 
 // 增加时间筛选和排序
 const hoursRange = ref(48)
-const sortBy = ref('hot_score')
+const sortBy = ref('created_at')
 const recSortBy = ref('match_score')
 
 // 当前鼠标悬停的平台行标识
@@ -91,8 +91,9 @@ const hoursOptions = [
 ]
 
 const sortOptions = [
+{ label: '时间排序', value: 'created_at' },
   { label: '热度排序', value: 'hot_score' },
-  { label: '时间排序', value: 'created_at' },
+  
 ]
 
 const recSortOptions = [
@@ -278,7 +279,7 @@ async function loadEvents(append = false) {
 
 /** 加载推荐匹配数据 */
 async function loadRecommendations() {
-  if (!userId.value) return
+  if (!authStore.isAuthenticated || !userId.value) return
   loadingRecommend.value = true
   try {
     const [keywords, recommended] = await Promise.all([
@@ -678,7 +679,7 @@ watch(() => route.query.event, (newId) => {
       <div class="widgets-column">
 
         <!-- 为你推荐（基于用户关键词的匹配） -->
-        <section class="widget-panel recommend-widget">
+        <section class="widget-panel recommend-widget" v-if="authStore.isAuthenticated">
           <div class="widget-header recommend-header">
             <h3>
               <i class="fa-solid fa-wand-magic-sparkles"></i>
diff --git a/frontend/src/views/LoginView.vue b/frontend/src/views/LoginView.vue
index d545c4e..304176e 100644
--- a/frontend/src/views/LoginView.vue
+++ b/frontend/src/views/LoginView.vue
@@ -287,6 +287,10 @@ onUnmounted(() => {
           <button class="btn-primary" :disabled="authStore.loading" type="submit">
             {{ isSubmitting ? '登录中...' : (loginMode === 'password' ? '密码登录' : '邮箱验证码登录') }}
           </button>
+          
+          <button type="button" class="btn-primary guest-btn" @click="router.push('/')" style="margin-top: 12px; background: var(--bg-input); color: var(--text-primary); border: 1px solid var(--border-subtle);">
+            以游客身份体验
+          </button>
         </form>
 
         <p class="form-footer">
@@ -574,6 +578,14 @@ onUnmounted(() => {
   border: 1px solid rgba(16, 185, 129, 0.2);
 }
 
+.btn-primary.guest-btn:hover {
+  background: var(--bg-hover) !important;
+  color: var(--text-primary) !important;
+  border-color: var(--border-strong) !important;
+  box-shadow: none !important;
+  transform: none !important;
+}
+
 .form-footer {
   margin-top: 32px;
   text-align: center;
diff --git a/frontend/src/views/RegisterView.vue b/frontend/src/views/RegisterView.vue
index 07beda6..b6595e6 100644
--- a/frontend/src/views/RegisterView.vue
+++ b/frontend/src/views/RegisterView.vue
@@ -265,6 +265,9 @@ onUnmounted(() => {
           <button class="btn-primary" :disabled="authStore.loading" type="submit">
             {{ isSubmitting ? '提交中...' : '注册并登录' }}
           </button>
+          <button type="button" class="btn-primary guest-btn" @click="router.push('/')" style="margin-top: 12px; background: var(--bg-input); color: var(--text-primary); border: 1px solid var(--border-subtle);">
+            以游客身份体验
+          </button>
         </form>
 
         <p class="form-footer">
@@ -533,6 +536,14 @@ onUnmounted(() => {
   border: 1px solid rgba(16, 185, 129, 0.2);
 }
 
+.btn-primary.guest-btn:hover {
+  background: var(--bg-hover) !important;
+  color: var(--text-primary) !important;
+  border-color: var(--border-strong) !important;
+  box-shadow: none !important;
+  transform: none !important;
+}
+
 .form-footer {
   margin-top: 32px;
   text-align: center;
diff --git a/frontend/src/views/RevisionsView.vue b/frontend/src/views/RevisionsView.vue
index 6f04fd5..a28acda 100644
--- a/frontend/src/views/RevisionsView.vue
+++ b/frontend/src/views/RevisionsView.vue
@@ -1,6 +1,6 @@
 <!-- 公关修改追踪页：展示热搜标题被偷偷修改的历史记录 -->
 <script setup lang="ts">
-import { computed, onMounted, ref } from 'vue'
+import { computed, onMounted, ref, reactive } from 'vue'
 
 import { fetchHeadlineRevisions } from '@/api/events'
 import type { HeadlineRevision } from '@/types/event'
@@ -141,6 +141,13 @@ function changeRange(hours: number) {
   loadRevisions()
 }
 
+/** 控制每个卡片的折叠状态 */
+const expandedCards = reactive<Record<number, boolean>>({})
+
+function toggleExpand(eventId: number) {
+  expandedCards[eventId] = !expandedCards[eventId]
+}
+
 onMounted(loadRevisions)
 </script>
 
@@ -219,27 +226,41 @@ onMounted(loadRevisions)
         </div>
 
         <div class="chain-area">
+          <!-- 当记录超过 7 条且未展开时，只显示前 3 条和后 3 条，中间用折叠按钮代替 -->
           <template v-for="(title, idx) in chain.titles" :key="idx">
-            <div
-              class="chain-title"
-              :class="{
-                'chain-title--original': idx === 0,
-                'chain-title--current': idx === chain.titles.length - 1,
-                'chain-title--middle': idx > 0 && idx < chain.titles.length - 1,
-              }"
-            >
-              <span class="chain-step-label">
-                {{ idx === 0 ? '原始' : idx === chain.titles.length - 1 ? '现在' : `第 ${idx} 次` }}
-              </span>
-              <p class="chain-title-text">{{ title }}</p>
-              <span v-if="idx < chain.change_times.length" class="chain-step-time">
-                {{ formatTime(chain.change_times[idx]) }}
-              </span>
-            </div>
-            <div v-if="idx < chain.titles.length - 1" class="chain-arrow">
-              <i class="fa-solid fa-arrow-down"></i>
-            </div>
+            <template v-if="chain.titles.length <= 7 || expandedCards[chain.event_id] || idx < 3 || idx >= chain.titles.length - 3">
+              <div
+                class="chain-title"
+                :class="{
+                  'chain-title--original': idx === 0,
+                  'chain-title--current': idx === chain.titles.length - 1,
+                  'chain-title--middle': idx > 0 && idx < chain.titles.length - 1,
+                }"
+              >
+                <span class="chain-step-label">
+                  {{ idx === 0 ? '原始' : idx === chain.titles.length - 1 ? '现在' : `第 ${idx} 次` }}
+                </span>
+                <p class="chain-title-text">{{ title }}</p>
+                <span v-if="idx < chain.change_times.length" class="chain-step-time">
+                  {{ formatTime(chain.change_times[idx]) }}
+                </span>
+              </div>
+              <div v-if="idx < chain.titles.length - 1" class="chain-arrow">
+                <i class="fa-solid fa-arrow-down" v-if="chain.titles.length <= 7 || expandedCards[chain.event_id] || idx !== 2"></i>
+                <!-- 在第3条的箭头处显示折叠按钮 -->
+                <button v-else class="expand-btn" @click="toggleExpand(chain.event_id)">
+                  <i class="fa-solid fa-angles-down"></i>
+                  展开省略的 {{ chain.titles.length - 6 }} 次修改
+                </button>
+              </div>
+            </template>
           </template>
+          <div v-if="chain.titles.length > 7 && expandedCards[chain.event_id]" class="chain-arrow collapse-arrow">
+            <button class="expand-btn collapse-btn" @click="toggleExpand(chain.event_id)">
+              <i class="fa-solid fa-angles-up"></i>
+              收起修改记录
+            </button>
+          </div>
         </div>
       </div>
     </div>
@@ -536,8 +557,53 @@ onMounted(loadRevisions)
 .chain-arrow {
   display: flex;
   justify-content: flex-start;
+  align-items: center;
   padding: 3px 0 3px 22px;
   color: var(--text-placeholder);
   font-size: 10px;
 }
+
+.expand-btn {
+  background: var(--bg-surface);
+  border: 1px dashed var(--border-strong);
+  color: var(--text-secondary);
+  font-size: 12px;
+  padding: 4px 12px;
+  border-radius: var(--radius-full);
+  cursor: pointer;
+  display: flex;
+  align-items: center;
+  gap: 6px;
+  transition: all 0.2s;
+  box-shadow: 0 1px 2px rgba(0,0,0,0.05);
+  margin-left: 8px;
+}
+
+.expand-btn:hover {
+  background: var(--brand-primary-alpha);
+  color: var(--brand-primary);
+  border-color: var(--brand-primary);
+  border-style: solid;
+}
+
+.collapse-arrow {
+  justify-content: center;
+  padding: 12px 0 0 0;
+  margin-top: 8px;
+  border-top: 1px dashed var(--border-subtle);
+}
+
+.collapse-btn {
+  background: transparent;
+  border: none;
+  box-shadow: none;
+  margin-left: 0;
+  color: var(--text-placeholder);
+}
+
+.collapse-btn:hover {
+  background: rgba(107, 114, 128, 0.1);
+  color: var(--text-primary);
+  border: none;
+}
 </style>
diff --git a/frontend/src/views/SearchView.vue b/frontend/src/views/SearchView.vue
index 49c59fe..f877ef0 100644
--- a/frontend/src/views/SearchView.vue
+++ b/frontend/src/views/SearchView.vue
@@ -11,7 +11,7 @@ const keyword = ref('')
 const searchResult = ref<SearchTimelineResponse | null>(null)
 const loading = ref(false)
 const hours = ref(2)
-const searchMode = ref<'exact' | 'semantic' | 'hybrid'>('hybrid')
+const searchMode = ref<'exact' | 'semantic' | 'hybrid'>('exact')
 const selectedTimeLabel = ref<string | null>(null)
 
 const timeOptions = [