diff --git a/ruoyi-ui-next/src/components.d.ts b/ruoyi-ui-next/src/components.d.ts
index 2d8f0ca..073f3e2 100644
--- a/ruoyi-ui-next/src/components.d.ts
+++ b/ruoyi-ui-next/src/components.d.ts
@@ -11,8 +11,14 @@ export {}
 /* prettier-ignore */
 declare module 'vue' {
   export interface GlobalComponents {
+    ElButton: typeof import('element-plus/es')['ElButton']
+    ElCard: typeof import('element-plus/es')['ElCard']
+    ElForm: typeof import('element-plus/es')['ElForm']
+    ElFormItem: typeof import('element-plus/es')['ElFormItem']
+    ElInput: typeof import('element-plus/es')['ElInput']
     HelloWorld: typeof import('./components/HelloWorld.vue')['default']
     RouterLink: typeof import('vue-router')['RouterLink']
     RouterView: typeof import('vue-router')['RouterView']
+    Sidebar: typeof import('./components/layout/Sidebar/index.vue')['default']
   }
 }
diff --git a/ruoyi-ui-next/src/components/layout/Sidebar/index.vue b/ruoyi-ui-next/src/components/layout/Sidebar/index.vue
new file mode 100644
index 0000000..7f54b07
--- /dev/null
+++ b/ruoyi-ui-next/src/components/layout/Sidebar/index.vue
@@ -0,0 +1,114 @@
+<template>
+  <aside class="sidebar">
+    <div class="sidebar-header">
+      <h2 class="logo">RuoYi</h2>
+    </div>
+    <nav class="sidebar-menu">
+      <div
+        v-for="item in menuItems"
+        :key="item.path"
+        class="menu-item"
+        :class="{ active: currentPath === item.path }"
+        @click="navigate(item.path)"
+      >
+        <el-icon v-if="item.icon">
+          <component :is="item.icon" />
+        </el-icon>
+        <span class="menu-text">{{ item.name }}</span>
+      </div>
+    </nav>
+  </aside>
+</template>
+
+<script setup lang="ts">
+import { ref } from 'vue'
+import { useRouter, useRoute } from 'vue-router'
+import {
+  HomeFilled,
+  Setting,
+  User,
+  Menu,
+  Document,
+} from '@element-plus/icons-vue'
+
+const router = useRouter()
+const route = useRoute()
+
+const currentPath = ref(route.path)
+
+const menuItems = [
+  { path: '/dashboard', name: '仪表盘', icon: HomeFilled },
+  { path: '/system', name: '系统管理', icon: Setting },
+  { path: '/monitor', name: '系统监控', icon: Menu },
+  { path: '/log', name: '日志管理', icon: Document },
+  { path: '/user', name: '用户管理', icon: User },
+]
+
+function navigate(path: string) {
+  currentPath.value = path
+  router.push(path)
+}
+</script>
+
+<style scoped lang="scss">
+.sidebar {
+  width: var(--sidebar-width);
+  height: 100vh;
+  background: var(--bg1);
+  border-right: 1px solid var(--bd);
+  display: flex;
+  flex-direction: column;
+  transition: width var(--transition-normal);
+
+  .sidebar-header {
+    height: var(--header-height);
+    display: flex;
+    align-items: center;
+    padding: 0 16px;
+    border-bottom: 1px solid var(--bd);
+
+    .logo {
+      font-size: 18px;
+      font-weight: 600;
+      color: var(--blu);
+      margin: 0;
+    }
+  }
+
+  .sidebar-menu {
+    flex: 1;
+    padding: 8px 0;
+    overflow-y: auto;
+  }
+
+  .menu-item {
+    display: flex;
+    align-items: center;
+    padding: 12px 16px;
+    cursor: pointer;
+    color: var(--t2);
+    transition: all var(--transition-fast);
+    gap: 12px;
+
+    &:hover {
+      background: var(--bg3);
+      color: var(--t1);
+    }
+
+    &.active {
+      background: rgba(88, 166, 255, 0.1);
+      color: var(--blu);
+      border-left: 3px solid var(--blu);
+    }
+
+    .el-icon {
+      font-size: 18px;
+    }
+
+    .menu-text {
+      font-size: 14px;
+      white-space: nowrap;
+    }
+  }
+}
+</style>
diff --git a/ruoyi-ui-next/src/composables/useTheme.ts b/ruoyi-ui-next/src/composables/useTheme.ts
new file mode 100644
index 0000000..37a7f41
--- /dev/null
+++ b/ruoyi-ui-next/src/composables/useTheme.ts
@@ -0,0 +1,12 @@
+import { ref } from 'vue'
+
+export function useTheme() {
+  const isDark = ref(true)
+
+  function toggleTheme() {
+    isDark.value = !isDark.value
+    document.documentElement.setAttribute('theme', isDark.value ? 'dark' : 'light')
+  }
+
+  return { isDark, toggleTheme }
+}
diff --git a/ruoyi-ui-next/src/main.ts b/ruoyi-ui-next/src/main.ts
index d1538eb..9c46ef2 100644
--- a/ruoyi-ui-next/src/main.ts
+++ b/ruoyi-ui-next/src/main.ts
@@ -1,13 +1,15 @@
 import { createApp } from 'vue'
 import ElementPlus from 'element-plus'
 import 'element-plus/dist/index.css'
+import 'element-plus/theme-chalk/dark/css-vars.css'
 import * as ElementPlusIconsVue from '@element-plus/icons-vue'
+import zhCn from 'element-plus/es/locale/lang/zh-cn'
 
 import App from './App.vue'
 import router from './router'
 import { createPinia } from 'pinia'
 
-import '@/styles/variables.scss'
+import '@/styles/index.scss'
 
 const app = createApp(App)
 
@@ -18,6 +20,6 @@ for (const [key, component] of Object.entries(ElementPlusIconsVue)) {
 
 app.use(createPinia())
 app.use(router)
-app.use(ElementPlus)
+app.use(ElementPlus, { locale: zhCn })
 
 app.mount('#app')
diff --git a/ruoyi-ui-next/src/styles/index.scss b/ruoyi-ui-next/src/styles/index.scss
new file mode 100644
index 0000000..89912fd
--- /dev/null
+++ b/ruoyi-ui-next/src/styles/index.scss
@@ -0,0 +1,28 @@
+// Global styles (variables.scss is auto-imported via vite.config.ts additionalData)
+
+// 全局样式
+body {
+  margin: 0;
+  background-color: var(--bg0);
+  color: var(--t1);
+  font-family: -apple-system, BlinkMacSystemFont, 'PingFang SC', 'Microsoft YaHei', sans-serif;
+}
+
+#app {
+  min-height: 100vh;
+}
+
+// 滚动条样式
+::-webkit-scrollbar {
+  width: 6px;
+  height: 6px;
+}
+
+::-webkit-scrollbar-thumb {
+  background: var(--bd);
+  border-radius: 3px;
+}
+
+::-webkit-scrollbar-track {
+  background: var(--bg1);
+}
diff --git a/ruoyi-ui-next/src/styles/variables.scss b/ruoyi-ui-next/src/styles/variables.scss
index f0e16c9..768c583 100644
--- a/ruoyi-ui-next/src/styles/variables.scss
+++ b/ruoyi-ui-next/src/styles/variables.scss
@@ -1,41 +1,56 @@
+// 深色主题配色（从 demo-dashboard-heatmap.html 提取）
 :root {
-  // Background colors
-  --bg0: #0d1117;
-  --bg1: #161b22;
-  --bg2: #1c2333;
-  --bg3: #2a3040;
+  // 背景色
+  --bg0: #0d1117;      // 最深背景
+  --bg1: #161b22;      // 侧边栏背景
+  --bg2: #1c2333;      // 卡片背景
+  --bg3: #2a3040;      // hover 背景
 
-  // Border color
+  // 边框
   --bd: #30363d;
 
-  // Text colors
-  --t1: #e6edf3;
-  --t2: #8b949e;
-  --tm: #6e7681;
+  // 文字
+  --t1: #e6edf3;       // 主文字
+  --t2: #8b949e;       // 次要文字
+  --tm: #6e7681;       // 提示文字
 
-  // Accent colors
-  --red: #f85149;
-  --grn: #3fb950;
-  --org: #d29922;
-  --blu: #58a6ff;
+  // 强调色
+  --red: #f85149;      // 红色（上涨、错误）
+  --grn: #3fb950;      // 绿色（下跌、成功）
+  --org: #d29922;      // 橙色（警告）
+  --blu: #58a6ff;      // 蓝色（链接、主色）
 
-  // Semantic colors
+  // 语义色
   --color-success: var(--grn);
   --color-warning: var(--org);
   --color-danger: var(--red);
   --color-info: var(--blu);
 
-  // Layout
+  // 布局
   --header-height: 56px;
   --sidebar-width: 220px;
   --sidebar-collapsed-width: 64px;
 
-  // Transitions
+  // 过渡动画
   --transition-fast: 0.15s ease;
   --transition-normal: 0.3s ease;
 }
 
-// Global styles
+// Element Plus 深色主题覆盖
+.el-button--primary {
+  --el-button-bg-color: var(--blu);
+  --el-button-border-color: var(--blu);
+}
+
+.el-table {
+  --el-table-bg-color: var(--bg2);
+  --el-table-tr-bg-color: var(--bg2);
+  --el-table-header-bg-color: var(--bg1);
+  --el-table-text-color: var(--t1);
+  --el-table-border-color: var(--bd);
+}
+
+// 全局样式
 * {
   box-sizing: border-box;
 }
@@ -47,7 +62,7 @@ html, body {
   color: var(--t1);
 }
 
-// Scrollbar styling
+// 滚动条样式
 ::-webkit-scrollbar {
   width: 8px;
   height: 8px;
diff --git a/ruoyi-ui-next/vite.config.ts b/ruoyi-ui-next/vite.config.ts
index 98868b9..3f76a21 100644
--- a/ruoyi-ui-next/vite.config.ts
+++ b/ruoyi-ui-next/vite.config.ts
@@ -8,7 +8,7 @@ import { resolve } from 'path'
 // https://vite.dev/config/
 export default defineConfig(({ mode }) => {
   const env = loadEnv(mode, process.cwd(), '')
-  
+
   return {
     plugins: [
       vue(),
@@ -27,6 +27,13 @@ export default defineConfig(({ mode }) => {
         '@': resolve(__dirname, 'src'),
       },
     },
+    css: {
+      preprocessorOptions: {
+        scss: {
+          additionalData: `@import "@/styles/variables.scss";\n`
+        }
+      }
+    },
     server: {
       port: 80,
       host: true,
@@ -51,10 +58,16 @@ export default defineConfig(({ mode }) => {
       chunkSizeWarningLimit: 1500,
       rollupOptions: {
         output: {
-          manualChunks: {
-            'element-plus': ['element-plus'],
-            'vue-vendor': ['vue', 'vue-router', 'pinia'],
-            'echarts': ['echarts', 'vue-echarts'],
+          manualChunks(id) {
+            if (id.includes('element-plus')) {
+              return 'element-plus'
+            }
+            if (id.includes('node_modules') && (id.includes('vue') || id.includes('vue-router') || id.includes('pinia'))) {
+              return 'vue-vendor'
+            }
+            if (id.includes('echarts')) {
+              return 'echarts'
+            }
           },
         },
       },