diff --git a/src/layouts/DefaultLayout.vue b/src/layouts/DefaultLayout.vue
index 67d76b5..e9b7f72 100644
--- a/src/layouts/DefaultLayout.vue
+++ b/src/layouts/DefaultLayout.vue
@@ -8,7 +8,7 @@
  * - TabBar：多标签页切换栏
  * - 头像下拉菜单：用户信息头部 + 个人中心 + 系统设置 + 主题切换 + 退出登录
  */
-import { computed, onMounted, ref } from 'vue'
+import { computed, onMounted, ref, watch } from 'vue'
 import { useRoute, useRouter } from 'vue-router'
 import { ElMessage } from 'element-plus'
 import { useAppStore } from '@/stores/app'
@@ -75,6 +75,38 @@ function handleMenuSelect(index: string): void {
   router.push(index)
 }
 
+/** 折叠态下点击侧边栏任意位置（菜单项/子菜单标题），自动展开侧边栏 */
+function handleSidebarClick(): void {
+  if (appStore.sidebarCollapsed) {
+    appStore.toggleSidebar()
+  }
+}
+
+// === 菜单折叠：折叠时收起所有展开的二级菜单（配合 CSS 过渡实现平滑收回）===
+const menuRef = ref()
+
+/** 收起所有已展开的二级菜单 */
+function closeAllSubMenus(): void {
+  const menu = menuRef.value
+  if (!menu) return
+  for (const m of userStore.menus) {
+    if (m.Children?.length) {
+      try {
+        menu.close(m.Path || m.Title)
+      } catch {
+        // 未展开的 sub-menu close 可能抛错，忽略
+      }
+    }
+  }
+}
+
+watch(
+  () => appStore.sidebarCollapsed,
+  (collapsed) => {
+    if (collapsed) closeAllSubMenus()
+  },
+)
+
 /** 头像下拉菜单命令统一处理 */
 function handleUserCommand(cmd: string): void {
   switch (cmd) {
@@ -226,11 +258,11 @@ const isFaIcon = (icon: string | undefined | null): boolean => {
       <aside class="gerp-sidebar" :class="{ collapsed: appStore.sidebarCollapsed }">
         <el-scrollbar>
           <el-menu
+            ref="menuRef"
             :default-active="activeMenu"
-            :collapse="appStore.sidebarCollapsed"
-            :collapse-transition="true"
             router
             @select="handleMenuSelect"
+            @click.capture="handleSidebarClick"
           >
             <template v-for="menu in userStore.menus" :key="menu.Path || menu.Title">
               <!-- 含子菜单 -->
@@ -247,7 +279,7 @@ const isFaIcon = (icon: string | undefined | null): boolean => {
                 >
                   <i v-if="child.Icon && isFaIcon(child.Icon)" :class="child.Icon" class="gerp-menu-icon" />
                   <el-icon v-else-if="child.Icon"><component :is="child.Icon" /></el-icon>
-                  <template #title>{{ child.Title }}</template>
+                  <template #title><span>{{ child.Title }}</span></template>
                 </el-menu-item>
               </el-sub-menu>
 
@@ -255,7 +287,7 @@ const isFaIcon = (icon: string | undefined | null): boolean => {
               <el-menu-item v-else :index="menu.Path || ''">
                 <i v-if="menu.Icon && isFaIcon(menu.Icon)" :class="menu.Icon" class="gerp-menu-icon" />
                 <el-icon v-else-if="menu.Icon"><component :is="menu.Icon" /></el-icon>
-                <template #title>{{ menu.Title }}</template>
+                <template #title><span>{{ menu.Title }}</span></template>
               </el-menu-item>
             </template>
           </el-menu>
@@ -394,6 +426,7 @@ const isFaIcon = (icon: string | undefined | null): boolean => {
 
 .gerp-sidebar {
   width: 220px;
+  flex-shrink: 0;
   background: #fff;
   border-right: 1px solid var(--gerp-border-color);
   transition: width 0.3s cubic-bezier(0.4, 0, 0.2, 1);
@@ -401,10 +434,6 @@ const isFaIcon = (icon: string | undefined | null): boolean => {
   display: flex;
   flex-direction: column;
 
-  &.collapsed {
-    width: 64px;
-  }
-
   :deep(.el-scrollbar) {
     flex: 1;
   }
@@ -412,6 +441,64 @@ const isFaIcon = (icon: string | undefined | null): boolean => {
   :deep(.el-menu) {
     border-right: none;
     padding: 8px 0;
+    // 宽度跟随侧边栏平滑收缩
+    transition: width 0.3s cubic-bezier(0.4, 0, 0.2, 1);
+  }
+
+  // 菜单文字：折叠/展开时平滑淡出/淡入 + max-width 收缩，icon 不受影响保持显示
+  // max-width + overflow hidden 让文字淡出时不占空间，避免 width 变小时文字换行叠到 icon 上
+  :deep(.el-menu-item span),
+  :deep(.el-sub-menu__title span) {
+    transition: opacity 0.25s ease, max-width 0.3s cubic-bezier(0.4, 0, 0.2, 1);
+    white-space: nowrap;
+    overflow: hidden;
+    max-width: 160px;
+  }
+
+  // sub-menu 箭头：折叠时随文字一起淡出，展开时淡入
+  :deep(.el-sub-menu__icon-arrow) {
+    transition: opacity 0.25s ease;
+  }
+
+  // 二级菜单容器：折叠时高度平滑收起，展开侧边栏后恢复
+  // min-width: 0 允许其跟随容器收缩（否则默认 min-width: 200px 会撑住 sub-menu 宽度）
+  :deep(.el-menu--inline) {
+    min-width: 0;
+    max-height: 1000px;
+    overflow: hidden;
+    transition: max-height 0.3s cubic-bezier(0.4, 0, 0.2, 1);
+  }
+
+  // 折叠态：宽度变小 + 文字淡出收缩 + 箭头隐藏 + 二级菜单收起
+  // 注意：icon 保持与展开态完全相同的位置（padding/margin 不变），仅宽度收缩 + 文字淡出
+  &.collapsed {
+    width: 64px;
+    // 隐藏左侧指示条
+    :deep(.el-menu-item),
+    :deep(.el-sub-menu__title) {
+      &::before {
+        display: none;
+      }
+    }
+    :deep(.el-menu-item span),
+    :deep(.el-sub-menu__title span) {
+      opacity: 0;
+      max-width: 0;
+    }
+    :deep(.el-sub-menu__icon-arrow) {
+      opacity: 0;
+    }
+    :deep(.el-menu--inline) {
+      max-height: 0;
+    }
+    // 折叠态隐藏版本号文字，设置按钮居中
+    .gerp-version {
+      display: none;
+    }
+    .gerp-sidebar-footer {
+      justify-content: center;
+      padding: 8px 0;
+    }
   }
 
   // 菜单项：对齐原版 GERP 的左侧指示条 + hover/active 效果
@@ -419,7 +506,7 @@ const isFaIcon = (icon: string | undefined | null): boolean => {
     position: relative;
     margin: 2px 8px;
     border-radius: 8px;
-    transition: all 0.2s ease;
+    transition: padding 0.4s cubic-bezier(0.25, 0.1, 0.25, 1), background-color 0.2s ease, color 0.2s ease;
 
     // 左侧指示条（hover/active 时显示）
     &::before {
@@ -459,7 +546,7 @@ const isFaIcon = (icon: string | undefined | null): boolean => {
   :deep(.el-sub-menu__title) {
     margin: 2px 8px;
     border-radius: 8px;
-    transition: all 0.2s ease;
+    transition: padding 0.4s cubic-bezier(0.25, 0.1, 0.25, 1), background-color 0.2s ease, color 0.2s ease;
 
     &:hover {
       background: var(--el-fill-color-light);
@@ -503,6 +590,8 @@ const isFaIcon = (icon: string | undefined | null): boolean => {
     font-size: 18px;
     text-align: center;
     vertical-align: middle;
+    // margin 过渡让折叠/展开时图标右间距平滑变化（更平缓）
+    transition: margin 0.4s cubic-bezier(0.25, 0.1, 0.25, 1);
   }
 
   // 折叠态：图标居中，去除右边距