diff --git a/mateclaw-ui/src/components/chat/ConversationSidebar.vue b/mateclaw-ui/src/components/chat/ConversationSidebar.vue
index 8d74e213..50ab2a7d 100644
--- a/mateclaw-ui/src/components/chat/ConversationSidebar.vue
+++ b/mateclaw-ui/src/components/chat/ConversationSidebar.vue
@@ -58,81 +58,87 @@
     <div class="conversation-list">
       <template v-for="group in groupedConversations" :key="group.label">
         <div v-if="!collapsed || isMobile" class="conv-group-title">{{ group.label }}</div>
-        <div
+        <McTooltip
           v-for="conv in group.items"
           :key="conv.conversationId"
-          class="conv-item"
-          :class="{
-            active: !selectMode && currentConversationId === conv.conversationId,
-            'is-running': conv.streamStatus === 'running',
-            'is-selected': selectMode && selectedConvIds.includes(conv.conversationId),
-            'menu-open': menuConvId === conv.conversationId,
-          }"
-          @click="onConvClick(conv)"
+          :content="conv.title"
+          placement="right"
+          :disabled="!collapsed || isMobile || !conv.title"
         >
-          <label
-            v-if="selectMode && (!collapsed || isMobile)"
-            class="conv-checkbox"
-            @click.stop
+          <div
+            class="conv-item"
+            :class="{
+              active: !selectMode && currentConversationId === conv.conversationId,
+              'is-running': conv.streamStatus === 'running',
+              'is-selected': selectMode && selectedConvIds.includes(conv.conversationId),
+              'menu-open': menuConvId === conv.conversationId,
+            }"
+            @click="onConvClick(conv)"
           >
-            <input
-              type="checkbox"
-              :checked="selectedConvIds.includes(conv.conversationId)"
-              @change="toggleConvSelection(conv)"
-            />
-          </label>
-          <div class="conv-icon">
-            <img :src="channelIconUrl(conv.source)" width="14" height="14" alt="" />
-            <span
-              v-if="conv.streamStatus === 'running'"
-              class="conv-running-dot"
-              :title="t('chat.streamGenerating')"
-            ></span>
-          </div>
-          <div v-if="!collapsed || isMobile" class="conv-info">
-            <input
-              v-if="renamingConvId === conv.conversationId"
-              v-model="renameText"
-              class="conv-title-input"
-              @keydown.enter="confirmRename(conv)"
-              @keydown.escape="cancelRename"
-              @blur="confirmRename(conv)"
+            <label
+              v-if="selectMode && (!collapsed || isMobile)"
+              class="conv-checkbox"
               @click.stop
-            />
-            <div v-else class="conv-title" @dblclick.stop="startRename(conv)">
-              <span>{{ conv.title }}</span>
-              <span
-                v-if="hasUnread(conv)"
-                class="conv-unread-dot"
-                :title="t('chat.hasUnread', '有新内容')"
-              ></span>
+            >
+              <input
+                type="checkbox"
+                :checked="selectedConvIds.includes(conv.conversationId)"
+                @change="toggleConvSelection(conv)"
+              />
+            </label>
+            <div class="conv-icon">
+              <img :src="channelIconUrl(conv.source)" width="14" height="14" alt="" />
               <span
                 v-if="conv.streamStatus === 'running'"
-                class="conv-running-badge"
+                class="conv-running-dot"
                 :title="t('chat.streamGenerating')"
+              ></span>
+            </div>
+            <div v-if="!collapsed || isMobile" class="conv-info">
+              <input
+                v-if="renamingConvId === conv.conversationId"
+                v-model="renameText"
+                class="conv-title-input"
+                @keydown.enter="confirmRename(conv)"
+                @keydown.escape="cancelRename"
+                @blur="confirmRename(conv)"
+                @click.stop
+              />
+              <div v-else class="conv-title" @dblclick.stop="startRename(conv)">
+                <span>{{ conv.title }}</span>
+                <span
+                  v-if="hasUnread(conv)"
+                  class="conv-unread-dot"
+                  :title="t('chat.hasUnread', '有新内容')"
+                ></span>
+                <span
+                  v-if="conv.streamStatus === 'running'"
+                  class="conv-running-badge"
+                  :title="t('chat.streamGenerating')"
+                >
+                  <span class="conv-running-badge-pulse"></span>
+                  {{ t('chat.streamGenerating') }}
+                </span>
+              </div>
+              <div class="conv-meta">
+                <span>{{ t('chat.messages', { count: conv.messageCount }) }}</span>
+                <span class="conv-dot">·</span>
+                <span>{{ formatConversationTime(conv.lastActiveTime) }}</span>
+              </div>
+            </div>
+            <!-- Single overflow ("⋮") button — opens the conversation context menu. -->
+            <div v-if="!selectMode && (!collapsed || isMobile)" class="conv-kebab-wrap">
+              <button
+                class="conv-kebab"
+                :class="{ open: menuConvId === conv.conversationId }"
+                @click.stop="openMenu(conv, $event)"
+                :title="t('common.more')"
               >
-                <span class="conv-running-badge-pulse"></span>
-                {{ t('chat.streamGenerating') }}
-              </span>
-            </div>
-            <div class="conv-meta">
-              <span>{{ t('chat.messages', { count: conv.messageCount }) }}</span>
-              <span class="conv-dot">·</span>
-              <span>{{ formatConversationTime(conv.lastActiveTime) }}</span>
+                <svg width="15" height="15" viewBox="0 0 24 24" fill="currentColor"><circle cx="12" cy="5" r="1.6"/><circle cx="12" cy="12" r="1.6"/><circle cx="12" cy="19" r="1.6"/></svg>
+              </button>
             </div>
           </div>
-          <!-- Single overflow ("⋮") button — opens the conversation context menu. -->
-          <div v-if="!selectMode && (!collapsed || isMobile)" class="conv-kebab-wrap">
-            <button
-              class="conv-kebab"
-              :class="{ open: menuConvId === conv.conversationId }"
-              @click.stop="openMenu(conv, $event)"
-              :title="t('common.more')"
-            >
-              <svg width="15" height="15" viewBox="0 0 24 24" fill="currentColor"><circle cx="12" cy="5" r="1.6"/><circle cx="12" cy="12" r="1.6"/><circle cx="12" cy="19" r="1.6"/></svg>
-            </button>
-          </div>
-        </div>
+        </McTooltip>
       </template>
 
       <div v-if="conversations.length === 0" class="empty-convs">
@@ -181,6 +187,7 @@ import { useI18n } from 'vue-i18n'
 import { Plus } from '@element-plus/icons-vue'
 import AgentPickerDialog from '@/components/common/AgentPickerDialog.vue'
 import DropdownMenu, { type DropdownMenuItem } from '@/components/common/DropdownMenu.vue'
+import McTooltip from '@/components/common/McTooltip.vue'
 import { conversationApi } from '@/api/index'
 import { channelIconUrl } from '@/utils/channelSource'
 import { mcToast } from '@/composables/useMcToast'
diff --git a/mateclaw-ui/src/components/common/McTooltip.vue b/mateclaw-ui/src/components/common/McTooltip.vue
new file mode 100644
index 00000000..7f317343
--- /dev/null
+++ b/mateclaw-ui/src/components/common/McTooltip.vue
@@ -0,0 +1,74 @@
+<script setup lang="ts">
+/**
+ * MateClaw-styled tooltip.
+ *
+ * A thin wrapper over Element Plus `el-tooltip` that pins the app's
+ * visual identity onto every tooltip: a frosted-glass surface, rounded
+ * geometry, no arrow, and automatic light/dark theming. Use it as a
+ * drop-in replacement for `<el-tooltip>` — every prop and the default /
+ * `#content` slots pass straight through, while `effect`, the frosted
+ * `popper-class` and the arrow visibility stay owned by the wrapper so
+ * tooltips look identical across the app.
+ */
+import { computed } from 'vue'
+
+defineOptions({ inheritAttrs: false })
+
+const props = defineProps<{
+  /** Extra class(es) merged onto the frosted popper element. */
+  popperClass?: string
+}>()
+
+// `mc-tooltip` drives the frosted styling below; callers may layer on more.
+const mergedPopperClass = computed(
+  () => ['mc-tooltip', props.popperClass].filter(Boolean).join(' '),
+)
+</script>
+
+<template>
+  <el-tooltip
+    :show-after="80"
+    :offset="8"
+    v-bind="$attrs"
+    effect="mateclaw"
+    :show-arrow="false"
+    :popper-class="mergedPopperClass"
+  >
+    <slot />
+    <template v-if="$slots.content" #content>
+      <slot name="content" />
+    </template>
+  </el-tooltip>
+</template>
+
+<!-- Not scoped: el-tooltip teleports its popper to <body>, so the popper
+     is unreachable by scoped styles. The `mc-tooltip` popper class keeps
+     these rules namespaced. The `mateclaw` effect carries no Element Plus
+     theme of its own, so the wrapper fully owns the surface. -->
+<style>
+.el-popper.mc-tooltip {
+  background: rgba(255, 250, 245, 0.82);
+  -webkit-backdrop-filter: blur(20px) saturate(180%);
+  backdrop-filter: blur(20px) saturate(180%);
+  border: 1px solid var(--mc-border-light);
+  border-radius: 10px;
+  padding: 7px 11px;
+  max-width: 260px;
+  color: var(--mc-text-primary);
+  font-size: 12px;
+  font-weight: 500;
+  line-height: 1.5;
+  letter-spacing: -0.005em;
+  box-shadow:
+    0 1px 0 rgba(255, 255, 255, 0.6) inset,
+    0 8px 24px rgba(25, 14, 8, 0.16);
+}
+
+html.dark .el-popper.mc-tooltip {
+  background: rgba(32, 26, 22, 0.86);
+  border-color: rgba(255, 255, 255, 0.08);
+  box-shadow:
+    0 1px 0 rgba(255, 255, 255, 0.06) inset,
+    0 8px 24px rgba(0, 0, 0, 0.45);
+}
+</style>
diff --git a/mateclaw-ui/src/views/ChatConsole.vue b/mateclaw-ui/src/views/ChatConsole.vue
index 3e8a39e1..df6cf904 100644
--- a/mateclaw-ui/src/views/ChatConsole.vue
+++ b/mateclaw-ui/src/views/ChatConsole.vue
@@ -1978,6 +1978,8 @@ function handleCodeCopy(e: MouseEvent) {
 }
 
 .agent-badge-icon {
+  display: flex;
+  align-items: center;
   font-size: 14px;
 }
 
diff --git a/mateclaw-ui/src/views/layout/MainLayout.vue b/mateclaw-ui/src/views/layout/MainLayout.vue
index dda9d257..05d1fc04 100644
--- a/mateclaw-ui/src/views/layout/MainLayout.vue
+++ b/mateclaw-ui/src/views/layout/MainLayout.vue
@@ -41,32 +41,38 @@
         <template v-for="group in navGroups" :key="group.key">
           <div class="nav-group">
             <div v-if="!effectiveCollapsed" class="nav-group-title">{{ group.label }}</div>
-            <router-link
+            <McTooltip
               v-for="item in group.items"
               :key="item.path"
-              :to="item.path"
-              class="nav-item"
-              :class="{ active: isNavItemActive(item) }"
-              :title="effectiveCollapsed ? (item.tooltip || item.label) : (item.tooltip || '')"
-              @click="onNavClick"
+              :content="item.tooltip || item.label"
+              placement="right"
+              :disabled="!effectiveCollapsed"
             >
-              <span class="nav-icon" v-html="item.icon"></span>
-              <span v-if="!effectiveCollapsed" class="nav-label">{{ item.label }}</span>
-              <NavBadge
-                v-if="item.path === '/agents' && isAdminRole"
-                :dot="liveAlertActive"
-                tone="warning"
-                :collapsed="effectiveCollapsed"
-                :title="t('live.attention')"
-              />
-              <NavBadge
-                v-else-if="item.path === '/security' && isAdminRole"
-                :count="pendingApprovals"
-                tone="urgent"
-                :collapsed="effectiveCollapsed"
-                :title="t('notifications.pendingApprovals', { n: pendingApprovals })"
-              />
-            </router-link>
+              <router-link
+                :to="item.path"
+                class="nav-item"
+                :class="{ active: isNavItemActive(item) }"
+                :title="effectiveCollapsed ? '' : (item.tooltip || '')"
+                @click="onNavClick"
+              >
+                <span class="nav-icon" v-html="item.icon"></span>
+                <span v-if="!effectiveCollapsed" class="nav-label">{{ item.label }}</span>
+                <NavBadge
+                  v-if="item.path === '/agents' && isAdminRole"
+                  :dot="liveAlertActive"
+                  tone="warning"
+                  :collapsed="effectiveCollapsed"
+                  :title="t('live.attention')"
+                />
+                <NavBadge
+                  v-else-if="item.path === '/security' && isAdminRole"
+                  :count="pendingApprovals"
+                  tone="urgent"
+                  :collapsed="effectiveCollapsed"
+                  :title="t('notifications.pendingApprovals', { n: pendingApprovals })"
+                />
+              </router-link>
+            </McTooltip>
           </div>
         </template>
       </nav>
@@ -196,6 +202,7 @@ import OnboardingWizard from '@/views/Onboarding/OnboardingWizard.vue'
 import DoctorDrawer from '@/views/Doctor/DoctorDrawer.vue'
 import WorkspaceSwitcher from '@/components/workspace/WorkspaceSwitcher.vue'
 import NavBadge from '@/components/common/NavBadge.vue'
+import McTooltip from '@/components/common/McTooltip.vue'
 import { useNotificationCenter } from '@/composables/useNotificationCenter'
 import { useWorkspaceStore } from '@/stores/useWorkspaceStore'
 import { applyLocale, currentLocale, type AppLocale } from '@/i18n'
@@ -746,6 +753,14 @@ watch(() => workspaceStore.currentWorkspaceId, () => {
 
 /* Active indicator bar removed — active state uses bg color + font weight only */
 
+/* Collapsed rail: the label is hidden, so center the lone icon on the
+   sidebar's vertical axis instead of leaving it left-aligned by the
+   nav-item's horizontal padding. */
+.sidebar.collapsed .nav-item {
+  justify-content: center;
+  gap: 0;
+}
+
 .nav-icon { display: flex; align-items: center; flex-shrink: 0; }
 .nav-label { overflow: hidden; text-overflow: ellipsis; }