diff --git a/README.md b/README.md
index ae782cf..f640655 100644
--- a/README.md
+++ b/README.md
@@ -5,8 +5,9 @@
 - 固定三列：**待办 / 进行中 / 已完成**
 - 快速新增、拖拽排序、详情编辑、删除撤销
 - 搜索与筛选（关键词 / 优先级 / 标签 / 今日到期 / 逾期）
-- **今日视图**：按紧急度汇总今天要做的事，含本周完成等统计
-- 键盘快捷键
+- **今日视图**：按紧急度分组汇总（逾期 / 今天到期 / 进行中 / 待办），含本周完成等统计
+- 键盘快捷键；任务卡片可用方向键换列与调序
+- **深色模式**：跟随系统 / 浅色 / 深色三态
 - 导出导入 JSON + 启动自动备份
 - **可安装为 PWA，支持离线使用**
 
@@ -44,7 +45,15 @@ npm run dev
 | `?` | 打开快捷键帮助 |
 | `Esc` | 关闭当前面板 |
 
-在输入框内输入时不会触发快捷键。
+卡片获得焦点（`Tab` 或点击）后：
+
+| 按键 | 作用 |
+|---|---|
+| `←` `→` | 把卡片移到上一列 / 下一列 |
+| `↑` `↓` | 在列内上移 / 下移 |
+| `Enter` | 打开任务详情 |
+
+在输入框内输入时不会触发全局快捷键。方向键移动在筛选态下只允许跨列（列内排序需要看到完整列表才有意义）。
 
 ---
 
@@ -55,11 +64,13 @@ npm run dev
 | 视图 | 路径 | 组织方式 |
 |---|---|---|
 | 看板 | `/` | 按**状态**：待办 / 进行中 / 已完成 |
-| 今日 | `/today` | 按**紧急度**：已逾期 → 今天到期 → 进行中 |
+| 今日 | `/today` | 按**紧急度**：已逾期 → 今天到期 → 进行中 → 待办 |
 
-今日视图顶部有四张统计卡片（今日待办 / 逾期 / 今天到期 / 本周完成），下方是可直接勾选完成的待办列表。
+今日视图顶部有四张统计卡片（逾期 / 今天到期 / 进行中 / 本周完成），下方是可直接勾选完成的待办列表。
 
-分组是**互斥**的：一张卡片只会出现在一组里，归属优先级为「逾期 > 今天到期 > 进行中」，所以你能一眼数清今天到底有几件事。已完成和已归档的任务不会出现在今日视图。
+分组是**互斥**的：一张卡片只会出现在一组里，归属优先级为「逾期 > 今天到期 > 进行中 > 待办」，所以你能一眼数清今天到底有几件事。已完成和已归档的任务不会出现在今日视图。
+
+只要任务未完成且未归档，就一定会出现在某个分组里 —— 包括没设截止日期的待办（归入「待办」组）。
 
 ---
 
@@ -177,8 +188,8 @@ scripts/            # 图标生成等辅助脚本
 
 ## 测试
 
-- 单元测试：437 个用例，覆盖 `src/` 下的纯逻辑与组件行为，行覆盖率约 97%。
-- 端到端测试：23 个用例，分两组运行 —— 交互类跑 dev server，PWA 类跑生产构建（Service Worker 只在构建产物中生成）。覆盖「新增 → 拖拽 → 完成 → 刷新保持」「导出 → 清空 → 导入还原」「删除撤销」「搜索筛选」「键盘快捷键」「今日视图」「离线打开」等主链路，每个用例使用独立的浏览器上下文。
+- 单元测试：480 个用例，覆盖 `src/` 下的纯逻辑与组件行为，行覆盖率约 96%。
+- 端到端测试：25 个用例，分两组运行 —— 交互类跑 dev server，PWA 类跑生产构建（Service Worker 只在构建产物中生成）。覆盖「新增 → 拖拽 → 完成 → 刷新保持」「导出 → 清空 → 导入还原」「删除撤销」「搜索筛选」「键盘快捷键与方向键移动」「深色模式切换」「今日视图」「离线打开」等主链路，每个用例使用独立的浏览器上下文。
 
 ```bash
 npm run test:coverage
@@ -202,5 +213,6 @@ PLAYWRIGHT_CHANNEL=chromium npm run test:e2e  # 用自带 Chromium（需先 npx
 - 标签是字符串数组，重命名标签需要逐个任务修改。
 - 看板列固定为三列，不支持自定义。
 - 归档阈值固定为「已完成超过 7 天」，暂不可配置。
-- 今日视图的分组规则固定（逾期 > 今天到期 > 进行中），不可自定义。
+- 今日视图的分组规则固定（逾期 > 今天到期 > 进行中 > 待办），不可自定义。
 - 统计只覆盖本周完成数等基础指标，没有趋势图或历史留存。
+- 深色模式只跟随系统或手动三态切换，没有按时间段自动切换。
diff --git a/e2e/board.spec.ts b/e2e/board.spec.ts
index 5f78a12..cca4dde 100644
--- a/e2e/board.spec.ts
+++ b/e2e/board.spec.ts
@@ -113,3 +113,39 @@ test('输入框内输入不会触发快捷键', async ({ page }) => {
   await expect(search).toBeFocused()
   await expect(search).toHaveValue('n')
 })
+
+test('深色模式可切换并在刷新后保持', async ({ page }) => {
+  await page.goto('/')
+  const html = page.locator('html')
+  const themeButton = page.getByRole('button', { name: /主题/ })
+
+  await expect(html).not.toHaveClass(/dark/)
+
+  // 系统 → 浅色 → 深色
+  await themeButton.click()
+  await expect(html).not.toHaveClass(/dark/)
+  await themeButton.click()
+  await expect(html).toHaveClass(/dark/)
+
+  await page.reload()
+  await expect(html).toHaveClass(/dark/)
+
+  // 再点一次回到跟随系统
+  await themeButton.click()
+  await expect(html).not.toHaveClass(/dark/)
+})
+
+test('键盘方向键可以移动任务卡片', async ({ page }) => {
+  await addTask(page, '键盘移动我')
+  const card = page.locator('article').filter({ hasText: '键盘移动我' })
+  await card.focus()
+
+  await page.keyboard.press('ArrowRight')
+  await expect(page.locator('[data-column-id="doing"] article')).toHaveCount(1)
+
+  await page.keyboard.press('ArrowLeft')
+  await expect(page.locator('[data-column-id="todo"] article')).toHaveCount(1)
+
+  await page.reload()
+  await expect(page.locator('[data-column-id="todo"] article')).toHaveCount(1)
+})
diff --git a/e2e/pwa.spec.ts b/e2e/pwa.spec.ts
index 0d2893a..d3c2843 100644
--- a/e2e/pwa.spec.ts
+++ b/e2e/pwa.spec.ts
@@ -106,7 +106,7 @@ test('离线时深链 /today 也能打开（navigateFallback 生效）', async (
   await page.goto('/today')
 
   await expect(page.getByRole('heading', { name: '今日' })).toBeVisible()
-  await expect(page.getByText('今日待办')).toBeVisible()
+  await expect(page.getByText('本周完成')).toBeVisible()
 
   await context.setOffline(false)
 })
diff --git a/e2e/today.spec.ts b/e2e/today.spec.ts
index 2e443ed..edd58a1 100644
--- a/e2e/today.spec.ts
+++ b/e2e/today.spec.ts
@@ -34,7 +34,7 @@ test('导航可在看板与今日之间切换', async ({ page }) => {
 
   await page.getByRole('link', { name: '今日' }).click()
   await expect(page.getByRole('heading', { name: '今日' })).toBeVisible()
-  await expect(page.getByText('今日待办')).toBeVisible()
+  await expect(page.getByText('本周完成')).toBeVisible()
 
   await page.getByRole('link', { name: '看板' }).click()
   await expect(page.getByText('共 0 个任务')).toBeVisible()
@@ -58,13 +58,15 @@ test('今日视图汇总今天到期与进行中的任务', async ({ page }) =>
   await expect(page.getByRole('heading', { level: 2, name: /进行中/ })).toBeVisible()
 })
 
-test('未开始且无截止日期的任务不进入今日视图', async ({ page }) => {
+test('未开始且无截止日期的任务出现在「待办」组', async ({ page }) => {
   await addTask(page, '以后再说')
 
   await page.getByRole('link', { name: '今日' }).click()
 
-  await expect(page.locator('article')).toHaveCount(0)
-  await expect(page.getByText('今天没有待办事项')).toBeVisible()
+  // 早期版本这类任务在今日视图里完全消失，是一个真实的缺口
+  await expect(page.locator('article')).toHaveCount(1)
+  await expect(page.locator('article').filter({ hasText: '以后再说' })).toBeVisible()
+  await expect(page.getByRole('heading', { level: 2, name: /待办/ })).toBeVisible()
 })
 
 test('今日视图可以勾选完成', async ({ page }) => {
diff --git a/index.html b/index.html
index 1e7a138..0aa1bcf 100644
--- a/index.html
+++ b/index.html
@@ -12,6 +12,22 @@
     <meta name="apple-mobile-web-app-status-bar-style" content="default" />
     <meta name="apple-mobile-web-app-title" content="看板" />
     <title>看板 · 个人任务管理</title>
+    <script>
+      // 在首帧之前应用主题，避免深色模式下先闪一下白屏。
+      // 键名与 src/stores/theme.ts 中的 THEME_STORAGE_KEY 保持一致。
+      ;(function () {
+        try {
+          var mode = localStorage.getItem('kanban.theme') || 'system'
+          var prefersDark =
+            window.matchMedia && window.matchMedia('(prefers-color-scheme: dark)').matches
+          if (mode === 'dark' || (mode === 'system' && prefersDark)) {
+            document.documentElement.classList.add('dark')
+          }
+        } catch (error) {
+          // 读不到偏好就按浅色渲染，不影响使用
+        }
+      })()
+    </script>
   </head>
   <body>
     <div id="app"></div>
diff --git a/scripts/screenshot.mjs b/scripts/screenshot.mjs
index 840dd57..fcf1f43 100644
--- a/scripts/screenshot.mjs
+++ b/scripts/screenshot.mjs
@@ -125,20 +125,40 @@ async function main() {
   })
 
   const page = await context.newPage()
-  await page.goto(BASE_URL)
-  await page.evaluate((state) => {
-    localStorage.setItem('kanban.tasks', JSON.stringify(state))
-  }, STORAGE)
 
   const shots = [
-    { name: 'board', url: '/', viewport: { width: 1440, height: 900 } },
-    { name: 'today', url: '/today', viewport: { width: 1440, height: 900 } },
-    { name: 'board-detail', url: '/', viewport: { width: 1440, height: 900 }, openDetail: true },
-    { name: 'board-mobile', url: '/', viewport: { width: 390, height: 844 } },
+    { name: 'board', url: '/', viewport: { width: 1440, height: 900 }, theme: 'light' },
+    { name: 'today', url: '/today', viewport: { width: 1440, height: 900 }, theme: 'light' },
+    {
+      name: 'board-detail',
+      url: '/',
+      viewport: { width: 1440, height: 900 },
+      theme: 'light',
+      openDetail: true,
+    },
+    { name: 'board-mobile', url: '/', viewport: { width: 390, height: 844 }, theme: 'light' },
+    { name: 'board-dark', url: '/', viewport: { width: 1440, height: 900 }, theme: 'dark' },
+    { name: 'today-dark', url: '/today', viewport: { width: 1440, height: 900 }, theme: 'dark' },
+    {
+      name: 'board-dark-mobile',
+      url: '/',
+      viewport: { width: 390, height: 844 },
+      theme: 'dark',
+    },
   ]
 
   for (const shot of shots) {
     await page.setViewportSize(shot.viewport)
+    await page.goto(BASE_URL)
+
+    // 先写入种子数据与主题偏好，再重新进入目标页面
+    await page.evaluate(
+      ({ state, theme }) => {
+        localStorage.setItem('kanban.tasks', JSON.stringify(state))
+        localStorage.setItem('kanban.theme', theme)
+      },
+      { state: STORAGE, theme: shot.theme },
+    )
     await page.goto(`${BASE_URL}${shot.url}`)
     await page.waitForSelector('article, [data-role="empty-state"], h1')
 
diff --git a/src/App.spec.ts b/src/App.spec.ts
index 59ddda3..787d06c 100644
--- a/src/App.spec.ts
+++ b/src/App.spec.ts
@@ -1,14 +1,17 @@
-import { mount } from '@vue/test-utils'
+import { enableAutoUnmount, mount } from '@vue/test-utils'
 import { createPinia } from 'pinia'
 import { nextTick } from 'vue'
 import { createMemoryHistory } from 'vue-router'
-import { beforeEach, describe, expect, it, vi } from 'vitest'
+import { afterEach, beforeEach, describe, expect, it, vi } from 'vitest'
 
 import { SCHEMA_VERSION } from '@/data/schema'
 
 import App from './App.vue'
 import { createAppRouter } from './router'
 
+// App 会在 document 上注册快捷键监听，必须逐个卸载避免相互干扰
+enableAutoUnmount(afterEach)
+
 /** PWA 的虚拟模块在测试环境下无法解析，用桩替代 */
 vi.mock('virtual:pwa-register/vue', async () => {
   const { ref } = await import('vue')
@@ -111,7 +114,7 @@ describe('App 路由', () => {
 
   it('/today 渲染今日视图', async () => {
     const { wrapper } = await mountApp('/today')
-    expect(wrapper.text()).toContain('今日待办')
+    expect(wrapper.text()).toContain('本周完成')
     expect(wrapper.text()).not.toContain('共 0 个任务')
     wrapper.unmount()
   })
diff --git a/src/App.vue b/src/App.vue
index 46f5de8..debbc75 100644
--- a/src/App.vue
+++ b/src/App.vue
@@ -9,6 +9,7 @@ import SideDrawer from '@/components/SideDrawer.vue'
 import ToastHost from '@/components/ToastHost.vue'
 import { useKeyboardShortcuts } from '@/composables/useKeyboardShortcuts'
 import { useTaskStore } from '@/stores/tasks'
+import { useThemeStore } from '@/stores/theme'
 import { useUiStore } from '@/stores/ui'
 
 const SHORTCUTS = [
@@ -18,11 +19,21 @@ const SHORTCUTS = [
   { keys: 'Esc', description: '关闭当前面板' },
 ] as const
 
+/** 这些只在卡片获得焦点后生效 */
+const CARD_SHORTCUTS = [
+  { keys: 'Tab', description: '依次聚焦到任务卡片' },
+  { keys: '← →', description: '把卡片移到上一列 / 下一列' },
+  { keys: '↑ ↓', description: '在列内上移 / 下移' },
+  { keys: 'Enter', description: '打开任务详情' },
+] as const
+
 const store = useTaskStore()
 const ui = useUiStore()
+const theme = useThemeStore()
 
 onMounted(() => {
   store.init()
+  theme.init()
 })
 
 // 帮助面板是应用级的，因此在任何视图下都能用 ?
@@ -34,7 +45,7 @@ useKeyboardShortcuts({
 </script>
 
 <template>
-  <div class="flex h-full min-h-0 flex-col bg-slate-100">
+  <div class="flex h-full min-h-0 flex-col bg-slate-100 dark:bg-slate-950">
     <AppNav />
 
     <main class="flex min-h-0 flex-1 flex-col">
@@ -45,17 +56,39 @@ useKeyboardShortcuts({
   <BackupPanel :open="ui.backupOpen" @close="ui.closeBackup()" />
 
   <SideDrawer :open="ui.helpOpen" title="快捷键" @close="ui.closeHelp()">
+    <h3 class="mb-2 text-xs font-medium tracking-wide text-slate-400 uppercase dark:text-slate-500">
+      全局
+    </h3>
     <dl class="flex flex-col gap-3 text-sm">
       <div v-for="item in SHORTCUTS" :key="item.keys" class="flex items-center gap-3">
         <dt
-          class="w-14 shrink-0 rounded-md border border-slate-200 bg-slate-50 px-2 py-0.5 text-center font-mono text-xs text-slate-600"
+          class="w-14 shrink-0 rounded-md border border-slate-200 bg-slate-50 px-2 py-0.5 text-center font-mono text-xs text-slate-600 dark:border-slate-700 dark:bg-slate-800 dark:text-slate-300"
         >
           {{ item.keys }}
         </dt>
-        <dd class="text-slate-600">{{ item.description }}</dd>
+        <dd class="text-slate-600 dark:text-slate-300">{{ item.description }}</dd>
       </div>
     </dl>
-    <p class="mt-4 text-xs text-slate-400">在输入框内输入时不会触发快捷键。</p>
+
+    <h3
+      class="mt-6 mb-2 text-xs font-medium tracking-wide text-slate-400 uppercase dark:text-slate-500"
+    >
+      卡片聚焦后
+    </h3>
+    <dl class="flex flex-col gap-3 text-sm">
+      <div v-for="item in CARD_SHORTCUTS" :key="item.keys" class="flex items-center gap-3">
+        <dt
+          class="w-14 shrink-0 rounded-md border border-slate-200 bg-slate-50 px-2 py-0.5 text-center font-mono text-xs text-slate-600 dark:border-slate-700 dark:bg-slate-800 dark:text-slate-300"
+        >
+          {{ item.keys }}
+        </dt>
+        <dd class="text-slate-600 dark:text-slate-300">{{ item.description }}</dd>
+      </div>
+    </dl>
+
+    <p class="mt-4 text-xs text-slate-400 dark:text-slate-500">
+      在输入框内输入时不会触发快捷键。
+    </p>
   </SideDrawer>
 
   <ToastHost />
diff --git a/src/components/AppNav.vue b/src/components/AppNav.vue
index bc32123..9c5b5e2 100644
--- a/src/components/AppNav.vue
+++ b/src/components/AppNav.vue
@@ -1,9 +1,11 @@
 <script setup lang="ts">
 import { RouterLink } from 'vue-router'
 
+import { useThemeStore, THEME_LABELS } from '@/stores/theme'
 import { useUiStore } from '@/stores/ui'
 
 const ui = useUiStore()
+const theme = useThemeStore()
 
 const LINKS = [
   { to: '/', label: '看板' },
@@ -13,11 +15,11 @@ const LINKS = [
 
 <template>
   <header
-    class="flex items-center gap-3 border-b border-slate-200 bg-white/85 px-4 py-2.5 backdrop-blur-sm md:px-6"
+    class="flex items-center gap-3 border-b border-slate-200 bg-white/85 px-4 py-2.5 backdrop-blur-sm md:px-6 dark:border-slate-800 dark:bg-slate-900/85"
   >
     <div class="flex items-center gap-2">
       <span
-        class="flex size-6 shrink-0 items-center justify-center rounded-md bg-slate-900 text-white"
+        class="flex size-6 shrink-0 items-center justify-center rounded-md bg-slate-900 text-white dark:bg-slate-100 dark:text-slate-900"
       >
         <svg viewBox="0 0 16 16" class="size-3.5" aria-hidden="true">
           <rect x="1" y="2" width="3.4" height="12" rx="1.2" fill="currentColor" opacity="0.5" />
@@ -25,10 +27,14 @@ const LINKS = [
           <rect x="11.6" y="2" width="3.4" height="5" rx="1.2" fill="currentColor" opacity="0.75" />
         </svg>
       </span>
-      <span class="hidden text-sm font-semibold tracking-tight text-slate-900 sm:inline">看板</span>
+      <span
+        class="hidden text-sm font-semibold tracking-tight text-slate-900 sm:inline dark:text-slate-100"
+      >
+        看板
+      </span>
     </div>
 
-    <span class="h-5 w-px bg-slate-200" aria-hidden="true" />
+    <span class="h-5 w-px bg-slate-200 dark:bg-slate-800" aria-hidden="true" />
 
     <nav class="flex items-center gap-0.5" aria-label="主导航">
       <RouterLink
@@ -43,8 +49,8 @@ const LINKS = [
           class="rounded-md px-3 py-1.5 text-sm transition"
           :class="
             isExactActive
-              ? 'bg-slate-900 font-medium text-white shadow-sm'
-              : 'text-slate-600 hover:bg-slate-100 hover:text-slate-900'
+              ? 'bg-slate-900 font-medium text-white shadow-sm dark:bg-slate-100 dark:text-slate-900'
+              : 'text-slate-600 hover:bg-slate-100 hover:text-slate-900 dark:text-slate-400 dark:hover:bg-slate-800 dark:hover:text-slate-100'
           "
           :aria-current="isExactActive ? 'page' : undefined"
           @click="navigate"
@@ -57,7 +63,62 @@ const LINKS = [
     <div class="ml-auto flex items-center gap-1.5">
       <button
         type="button"
-        class="flex size-8 items-center justify-center rounded-md text-slate-400 transition hover:bg-slate-100 hover:text-slate-700"
+        class="flex size-8 items-center justify-center rounded-md text-slate-400 transition hover:bg-slate-100 hover:text-slate-700 dark:text-slate-500 dark:hover:bg-slate-800 dark:hover:text-slate-200"
+        :aria-label="`主题：${THEME_LABELS[theme.mode]}，点击切换`"
+        :title="`主题：${THEME_LABELS[theme.mode]}`"
+        @click="theme.cycle()"
+      >
+        <!-- 跟随系统 -->
+        <svg
+          v-if="theme.mode === 'system'"
+          viewBox="0 0 20 20"
+          class="size-4"
+          fill="none"
+          aria-hidden="true"
+        >
+          <rect
+            x="2.5"
+            y="4"
+            width="15"
+            height="10"
+            rx="1.5"
+            stroke="currentColor"
+            stroke-width="1.5"
+          />
+          <path d="M7 17h6" stroke="currentColor" stroke-width="1.5" stroke-linecap="round" />
+        </svg>
+
+        <!-- 浅色 -->
+        <svg
+          v-else-if="theme.mode === 'light'"
+          viewBox="0 0 20 20"
+          class="size-4"
+          fill="none"
+          aria-hidden="true"
+        >
+          <circle cx="10" cy="10" r="3.5" stroke="currentColor" stroke-width="1.5" />
+          <path
+            d="M10 2.5v1.8M10 15.7v1.8M2.5 10h1.8M15.7 10h1.8M4.7 4.7l1.3 1.3M14 14l1.3 1.3M15.3 4.7 14 6M6 14l-1.3 1.3"
+            stroke="currentColor"
+            stroke-width="1.5"
+            stroke-linecap="round"
+          />
+        </svg>
+
+        <!-- 深色 -->
+        <svg v-else viewBox="0 0 20 20" class="size-4" fill="none" aria-hidden="true">
+          <path
+            d="M16.5 11.8A6.9 6.9 0 0 1 8.2 3.5a6.9 6.9 0 1 0 8.3 8.3Z"
+            stroke="currentColor"
+            stroke-width="1.5"
+            stroke-linejoin="round"
+          />
+        </svg>
+      </button>
+
+      <button
+        type="button"
+        class="flex size-8 items-center justify-center rounded-md text-slate-400 transition hover:bg-slate-100 hover:text-slate-700 dark:text-slate-500 dark:hover:bg-slate-800 dark:hover:text-slate-200"
         aria-label="快捷键帮助"
         @click="ui.openHelp()"
       >
@@ -75,7 +136,7 @@ const LINKS = [
 
       <button
         type="button"
-        class="flex items-center gap-1.5 rounded-md border border-slate-200 px-2.5 py-1.5 text-sm text-slate-600 transition hover:border-slate-300 hover:bg-slate-50 hover:text-slate-900"
+        class="flex items-center gap-1.5 rounded-md border border-slate-200 px-2.5 py-1.5 text-sm text-slate-600 transition hover:border-slate-300 hover:bg-slate-50 hover:text-slate-900 dark:border-slate-700 dark:text-slate-300 dark:hover:border-slate-600 dark:hover:bg-slate-800"
         @click="ui.openBackup()"
       >
         <svg viewBox="0 0 20 20" class="size-3.5" fill="none" aria-hidden="true">
diff --git a/src/components/BackupPanel.vue b/src/components/BackupPanel.vue
index 82c6058..99208a0 100644
--- a/src/components/BackupPanel.vue
+++ b/src/components/BackupPanel.vue
@@ -88,30 +88,32 @@ function formatTime(iso: string): string {
 <template>
   <SideDrawer :open="props.open" title="备份与恢复" @close="emit('close')">
     <div class="flex flex-col gap-6">
-      <p class="rounded-md bg-amber-50 px-3 py-2 text-xs leading-relaxed text-amber-800">
+      <p
+        class="rounded-md bg-amber-50 px-3 py-2 text-xs leading-relaxed text-amber-800 dark:bg-amber-950/60 dark:text-amber-300"
+      >
         数据只保存在这台设备的浏览器里。清理浏览器数据会导致任务丢失，建议定期导出备份。
       </p>
 
       <p
         v-if="message"
         role="status"
-        class="rounded-md border border-emerald-300 bg-emerald-50 px-3 py-2 text-sm text-emerald-800"
+        class="rounded-md border border-emerald-300 bg-emerald-50 px-3 py-2 text-sm text-emerald-800 dark:border-emerald-800 dark:bg-emerald-950 dark:text-emerald-300"
       >
         {{ message }}
       </p>
       <p
         v-if="error"
         role="alert"
-        class="rounded-md border border-rose-300 bg-rose-50 px-3 py-2 text-sm text-rose-700"
+        class="rounded-md border border-rose-300 bg-rose-50 px-3 py-2 text-sm text-rose-700 dark:border-rose-800 dark:bg-rose-950 dark:text-rose-300"
       >
         {{ error }}
       </p>
 
       <section class="flex flex-col gap-2">
-        <h3 class="text-sm font-medium text-slate-700">导出</h3>
+        <h3 class="text-sm font-medium text-slate-700 dark:text-slate-300">导出</h3>
         <button
           type="button"
-          class="self-start rounded-md bg-sky-600 px-3 py-1.5 text-sm font-medium text-white transition hover:bg-sky-700"
+          class="self-start rounded-md bg-sky-600 px-3 py-1.5 text-sm font-medium text-white transition hover:bg-sky-700 dark:hover:bg-sky-500"
           @click="exportNow"
         >
           导出为 JSON
@@ -119,35 +121,35 @@ function formatTime(iso: string): string {
       </section>
 
       <section class="flex flex-col gap-2">
-        <h3 class="text-sm font-medium text-slate-700">导入</h3>
+        <h3 class="text-sm font-medium text-slate-700 dark:text-slate-300">导入</h3>
 
         <input
           type="file"
           accept="application/json,.json"
-          class="block w-full text-sm text-slate-600 file:mr-3 file:rounded-md file:border file:border-slate-300 file:bg-white file:px-3 file:py-1.5 file:text-sm file:text-slate-600"
+          class="block w-full text-sm text-slate-600 file:mr-3 file:rounded-md file:border file:border-slate-300 file:bg-white file:px-3 file:py-1.5 file:text-sm file:text-slate-600 dark:text-slate-400 dark:file:border-slate-600 dark:file:bg-slate-800 dark:file:text-slate-300"
           aria-label="选择导入文件"
           @change="onFileChange"
         />
 
         <div
           v-if="pending"
-          class="flex flex-col gap-2 rounded-md border border-amber-300 bg-amber-50 px-3 py-2"
+          class="flex flex-col gap-2 rounded-md border border-amber-300 bg-amber-50 px-3 py-2 dark:border-amber-800 dark:bg-amber-950/60"
         >
-          <p class="text-sm text-amber-900">
+          <p class="text-sm text-amber-900 dark:text-amber-200">
             将从「{{ pending.fileName }}」导入 {{ pending.count }} 个任务，
             <strong>并覆盖当前全部 {{ store.tasks.length }} 个任务</strong>。此操作不可撤销。
           </p>
           <div class="flex gap-2">
             <button
               type="button"
-              class="rounded-md bg-rose-600 px-3 py-1 text-sm font-medium text-white transition hover:bg-rose-700"
+              class="rounded-md bg-rose-600 px-3 py-1 text-sm font-medium text-white transition hover:bg-rose-700 dark:hover:bg-rose-500"
               @click="confirmImport"
             >
               确认覆盖导入
             </button>
             <button
               type="button"
-              class="rounded-md border border-slate-300 px-3 py-1 text-sm text-slate-600 transition hover:bg-white"
+              class="rounded-md border border-slate-300 px-3 py-1 text-sm text-slate-600 transition hover:bg-white dark:border-slate-600 dark:text-slate-300 dark:hover:bg-slate-800"
               @click="pending = null"
             >
               取消
@@ -157,26 +159,30 @@ function formatTime(iso: string): string {
       </section>
 
       <section class="flex flex-col gap-2">
-        <h3 class="text-sm font-medium text-slate-700">自动备份</h3>
-        <p class="text-xs text-slate-500">每次打开看板时自动留一份，最多保留 3 份。</p>
+        <h3 class="text-sm font-medium text-slate-700 dark:text-slate-300">自动备份</h3>
+        <p class="text-xs text-slate-500 dark:text-slate-400">
+          每次打开看板时自动留一份，最多保留 3 份。
+        </p>
 
         <ul v-if="snapshots.length > 0" class="flex flex-col gap-2">
           <li
             v-for="item in snapshots"
             :key="item.key"
-            class="flex items-center justify-between rounded-md border border-slate-200 px-3 py-2"
+            class="flex items-center justify-between rounded-md border border-slate-200 px-3 py-2 dark:border-slate-700"
           >
-            <span class="text-sm text-slate-600">{{ formatTime(item.savedAt) }}</span>
+            <span class="text-sm text-slate-600 dark:text-slate-300">
+              {{ formatTime(item.savedAt) }}
+            </span>
             <button
               type="button"
-              class="rounded-md px-2 py-0.5 text-sm text-sky-700 transition hover:bg-sky-50"
+              class="rounded-md px-2 py-0.5 text-sm text-sky-700 transition hover:bg-sky-50 dark:text-sky-400 dark:hover:bg-sky-950"
               @click="restore(item.key)"
             >
               恢复
             </button>
           </li>
         </ul>
-        <p v-else class="text-sm text-slate-400">暂无自动备份</p>
+        <p v-else class="text-sm text-slate-400 dark:text-slate-500">暂无自动备份</p>
       </section>
     </div>
   </SideDrawer>
diff --git a/src/components/BoardColumn.vue b/src/components/BoardColumn.vue
index 173b570..482f6f7 100644
--- a/src/components/BoardColumn.vue
+++ b/src/components/BoardColumn.vue
@@ -2,7 +2,7 @@
 import { computed, ref } from 'vue'
 import { useDraggable } from 'vue-draggable-plus'
 
-import type { ColumnDef, ColumnId, Task } from '@/types/task'
+import type { ColumnDef, ColumnId, MoveDirection, Task } from '@/types/task'
 import { resolveDrop, shouldAllowMove } from '@/utils/drag'
 
 import QuickAddTask from './QuickAddTask.vue'
@@ -14,13 +14,14 @@ const emit = defineEmits<{
   toggle: [id: string]
   open: [id: string]
   move: [payload: { id: string; toColumn: ColumnId; toIndex: number }]
+  keymove: [payload: { id: string; direction: MoveDirection }]
 }>()
 
 /** 每列一个色点：三列在余光里也能区分开 */
 const COLUMN_DOT: Record<ColumnId, string> = {
-  todo: 'bg-slate-400',
-  doing: 'bg-sky-500',
-  done: 'bg-emerald-500',
+  todo: 'bg-slate-400 dark:bg-slate-500',
+  doing: 'bg-sky-500 dark:bg-sky-400',
+  done: 'bg-emerald-500 dark:bg-emerald-400',
 }
 
 const dotClass = computed(() => COLUMN_DOT[props.column.id])
@@ -55,13 +56,15 @@ useDraggable(listRef, {
 </script>
 
 <template>
-  <section class="flex flex-col rounded-xl border border-slate-200 bg-slate-100/70 md:min-h-0">
+  <section
+    class="flex flex-col rounded-xl border border-slate-200 bg-slate-100/70 md:min-h-0 dark:border-slate-800 dark:bg-slate-900/60"
+  >
     <header class="flex items-center gap-2 px-3 pt-3 pb-2">
       <span class="size-1.5 shrink-0 rounded-full" :class="dotClass" aria-hidden="true" />
-      <h2 class="text-sm font-medium text-slate-700">{{ column.title }}</h2>
+      <h2 class="text-sm font-medium text-slate-700 dark:text-slate-300">{{ column.title }}</h2>
       <span
         data-role="column-count"
-        class="ml-auto rounded-full border border-slate-200 bg-white px-2 py-0.5 text-xs font-medium text-slate-500"
+        class="ml-auto rounded-full border border-slate-200 bg-white px-2 py-0.5 text-xs font-medium text-slate-500 dark:border-slate-700 dark:bg-slate-800 dark:text-slate-400"
       >
         {{ tasks.length }}
       </span>
@@ -80,11 +83,12 @@ useDraggable(listRef, {
         :task="task"
         @toggle="emit('toggle', $event)"
         @open="emit('open', $event)"
+        @keymove="emit('keymove', $event)"
       />
 
       <p
         v-if="tasks.length === 0"
-        class="rounded-lg border border-dashed border-slate-300/70 px-3 py-10 text-center text-xs text-slate-400"
+        class="rounded-lg border border-dashed border-slate-300/70 px-3 py-10 text-center text-xs text-slate-400 dark:border-slate-700 dark:text-slate-500"
       >
         暂无任务
       </p>
diff --git a/src/components/BoardToolbar.vue b/src/components/BoardToolbar.vue
index 6703639..582614c 100644
--- a/src/components/BoardToolbar.vue
+++ b/src/components/BoardToolbar.vue
@@ -56,7 +56,7 @@ defineExpose({ focusSearch })
       <div class="relative min-w-56 flex-1 sm:max-w-xs">
         <svg
           viewBox="0 0 20 20"
-          class="pointer-events-none absolute top-1/2 left-2.5 size-4 -translate-y-1/2 text-slate-400"
+          class="pointer-events-none absolute top-1/2 left-2.5 size-4 -translate-y-1/2 text-slate-400 dark:text-slate-500"
           fill="none"
           aria-hidden="true"
         >
@@ -67,14 +67,14 @@ defineExpose({ focusSearch })
           ref="searchRef"
           v-model="keyword"
           type="search"
-          class="w-full rounded-md border border-slate-200 bg-white py-1.5 pr-2.5 pl-8 text-sm text-slate-700 outline-none transition placeholder:text-slate-400 focus:border-sky-400 focus:ring-2 focus:ring-sky-100"
+          class="w-full rounded-md border border-slate-200 bg-white py-1.5 pr-2.5 pl-8 text-sm text-slate-700 outline-none transition placeholder:text-slate-400 focus:border-sky-400 focus:ring-2 focus:ring-sky-100 dark:border-slate-700 dark:bg-slate-900 dark:text-slate-200 dark:placeholder:text-slate-500 dark:focus:border-sky-600 dark:focus:ring-sky-950"
           placeholder="搜索标题或描述"
           aria-label="搜索任务"
         />
       </div>
 
       <div
-        class="flex items-center gap-0.5 rounded-md border border-slate-200 bg-white p-0.5"
+        class="flex items-center gap-0.5 rounded-md border border-slate-200 bg-white p-0.5 dark:border-slate-700 dark:bg-slate-900"
         role="group"
         aria-label="按优先级筛选"
       >
@@ -85,8 +85,8 @@ defineExpose({ focusSearch })
           class="rounded px-2.5 py-1 text-xs transition"
           :class="
             priorities.includes(value)
-              ? 'bg-slate-900 font-medium text-white'
-              : 'text-slate-600 hover:bg-slate-100'
+              ? 'bg-slate-900 font-medium text-white dark:bg-slate-100 dark:text-slate-900'
+              : 'text-slate-600 hover:bg-slate-100 dark:text-slate-400 dark:hover:bg-slate-800'
           "
           :aria-pressed="priorities.includes(value)"
           @click="filters.togglePriority(value)"
@@ -108,8 +108,8 @@ defineExpose({ focusSearch })
           class="flex items-center gap-1.5 rounded-md border px-2.5 py-1.5 text-xs transition"
           :class="
             due === 'today'
-              ? 'border-amber-300 bg-amber-50 text-amber-800'
-              : 'border-slate-200 bg-white text-slate-600 hover:border-slate-300 hover:bg-slate-50'
+              ? 'border-amber-300 bg-amber-50 text-amber-800 dark:border-amber-700 dark:bg-amber-950 dark:text-amber-300'
+              : 'border-slate-200 bg-white text-slate-600 hover:border-slate-300 hover:bg-slate-50 dark:border-slate-700 dark:bg-slate-900 dark:text-slate-300 dark:hover:border-slate-600 dark:hover:bg-slate-800'
           "
           :aria-pressed="due === 'today'"
           @click="filters.toggleDue('today')"
@@ -123,10 +123,10 @@ defineExpose({ focusSearch })
           class="flex items-center gap-1.5 rounded-md border px-2.5 py-1.5 text-xs transition"
           :class="
             due === 'overdue'
-              ? 'border-rose-300 bg-rose-50 text-rose-700'
+              ? 'border-rose-300 bg-rose-50 text-rose-700 dark:border-rose-700 dark:bg-rose-950 dark:text-rose-300'
               : overdueCount > 0
-                ? 'border-slate-200 bg-white text-rose-600 hover:border-rose-200 hover:bg-rose-50'
-                : 'border-slate-200 bg-white text-slate-600 hover:border-slate-300 hover:bg-slate-50'
+                ? 'border-slate-200 bg-white text-rose-600 hover:border-rose-200 hover:bg-rose-50 dark:border-slate-700 dark:bg-slate-900 dark:text-rose-400 dark:hover:border-rose-800 dark:hover:bg-rose-950'
+                : 'border-slate-200 bg-white text-slate-600 hover:border-slate-300 hover:bg-slate-50 dark:border-slate-700 dark:bg-slate-900 dark:text-slate-300 dark:hover:border-slate-600 dark:hover:bg-slate-800'
           "
           :aria-pressed="due === 'overdue'"
           @click="filters.toggleDue('overdue')"
@@ -137,15 +137,15 @@ defineExpose({ focusSearch })
       </div>
     </div>
 
-    <div class="flex flex-wrap items-center gap-x-2 gap-y-1.5 text-xs text-slate-500">
+    <div class="flex flex-wrap items-center gap-x-2 gap-y-1.5 text-xs text-slate-500 dark:text-slate-400">
       <span>共 {{ store.tasks.length }} 个任务</span>
-      <span v-if="hiddenNote" class="text-slate-400">{{ hiddenNote }}</span>
+      <span v-if="hiddenNote" class="text-slate-400 dark:text-slate-500">{{ hiddenNote }}</span>
 
       <div class="ml-auto flex items-center gap-1.5">
         <button
           v-if="archivableCount > 0"
           type="button"
-          class="rounded-md border border-slate-200 bg-white px-2.5 py-1 text-xs text-slate-600 transition hover:border-slate-300 hover:bg-slate-50"
+          class="rounded-md border border-slate-200 bg-white px-2.5 py-1 text-xs text-slate-600 transition hover:border-slate-300 hover:bg-slate-50 dark:border-slate-700 dark:bg-slate-900 dark:text-slate-300 dark:hover:border-slate-600 dark:hover:bg-slate-800"
           @click="emit('archive')"
         >
           归档 {{ archivableCount }} 个已完成
@@ -156,8 +156,8 @@ defineExpose({ focusSearch })
           class="rounded-md border px-2.5 py-1 text-xs transition"
           :class="
             includeArchived
-              ? 'border-sky-300 bg-sky-50 text-sky-700'
-              : 'border-slate-200 bg-white text-slate-600 hover:border-slate-300 hover:bg-slate-50'
+              ? 'border-sky-300 bg-sky-50 text-sky-700 dark:border-sky-700 dark:bg-sky-950 dark:text-sky-300'
+              : 'border-slate-200 bg-white text-slate-600 hover:border-slate-300 hover:bg-slate-50 dark:border-slate-700 dark:bg-slate-900 dark:text-slate-300 dark:hover:border-slate-600 dark:hover:bg-slate-800'
           "
           :aria-pressed="includeArchived"
           @click="filters.toggleArchived()"
@@ -168,7 +168,7 @@ defineExpose({ focusSearch })
         <button
           v-if="active"
           type="button"
-          class="rounded-md px-2.5 py-1 text-xs text-slate-500 underline-offset-2 transition hover:text-slate-800 hover:underline"
+          class="rounded-md px-2.5 py-1 text-xs text-slate-500 underline-offset-2 transition hover:text-slate-800 hover:underline dark:text-slate-400 dark:hover:text-slate-200"
           @click="filters.clear()"
         >
           清空筛选
diff --git a/src/components/DatePicker.vue b/src/components/DatePicker.vue
index 6ce272c..eef8134 100644
--- a/src/components/DatePicker.vue
+++ b/src/components/DatePicker.vue
@@ -5,6 +5,7 @@
  * 直接使用浏览器原生 `<input type="date">`：
  * - 其 value 规范就是 YYYY-MM-DD，与 ADR-003 的存储约定天然一致
  * - 自带可访问性、键盘操作与本地化日历，无需自己实现
+ * - 深色模式下日历弹层跟随 html 的 color-scheme
  */
 
 defineProps<{ modelValue: string | null; label?: string }>()
@@ -21,7 +22,7 @@ function onChange(event: Event): void {
   <div class="flex items-center gap-2">
     <input
       type="date"
-      class="min-w-0 flex-1 rounded-md border border-slate-300 px-2.5 py-1.5 text-sm text-slate-700 outline-none focus:border-sky-400"
+      class="min-w-0 flex-1 rounded-md border border-slate-300 px-2.5 py-1.5 text-sm text-slate-700 outline-none focus:border-sky-400 dark:border-slate-700 dark:bg-slate-800 dark:text-slate-200 dark:focus:border-sky-600"
       :value="modelValue ?? ''"
       :aria-label="label ?? '截止日期'"
       @change="onChange"
@@ -29,7 +30,7 @@ function onChange(event: Event): void {
     <button
       v-if="modelValue"
       type="button"
-      class="shrink-0 rounded px-2 py-1 text-xs text-slate-500 transition hover:bg-slate-100"
+      class="shrink-0 rounded px-2 py-1 text-xs text-slate-500 transition hover:bg-slate-100 dark:text-slate-400 dark:hover:bg-slate-800"
       @click="emit('update:modelValue', null)"
     >
       清除
diff --git a/src/components/PwaUpdatePrompt.vue b/src/components/PwaUpdatePrompt.vue
index e98a6bf..eb326e0 100644
--- a/src/components/PwaUpdatePrompt.vue
+++ b/src/components/PwaUpdatePrompt.vue
@@ -26,14 +26,14 @@ function reload(): void {
   <div v-if="visible" class="fixed inset-x-0 bottom-4 z-50 flex justify-center px-4">
     <div
       role="status"
-      class="flex items-center gap-3 rounded-md bg-slate-800 px-3 py-2 text-sm text-white shadow-lg"
+      class="flex items-center gap-3 rounded-md bg-slate-800 px-3 py-2 text-sm text-white shadow-panel dark:bg-slate-100 dark:text-slate-900"
     >
       <span>{{ needRefresh ? '有新版本可用' : '已缓存，可离线使用' }}</span>
 
       <button
         v-if="needRefresh"
         type="button"
-        class="shrink-0 rounded px-2 py-0.5 font-medium text-sky-300 transition hover:bg-white/10"
+        class="shrink-0 rounded px-2 py-0.5 font-medium text-sky-300 transition hover:bg-white/10 dark:text-sky-700 dark:hover:bg-slate-900/10"
         @click="reload"
       >
         立即更新
@@ -41,7 +41,7 @@ function reload(): void {
 
       <button
         type="button"
-        class="shrink-0 rounded px-1.5 text-slate-400 transition hover:text-white"
+        class="shrink-0 rounded px-1.5 text-slate-400 transition hover:text-white dark:text-slate-500 dark:hover:text-slate-900"
         aria-label="关闭提示"
         @click="dismiss"
       >
diff --git a/src/components/QuickAddTask.vue b/src/components/QuickAddTask.vue
index a9d1b14..58b0ce8 100644
--- a/src/components/QuickAddTask.vue
+++ b/src/components/QuickAddTask.vue
@@ -37,7 +37,7 @@ defineExpose({ focusInput })
       ref="inputRef"
       v-model="title"
       type="text"
-      class="w-full rounded-lg border border-transparent bg-white/60 px-3 py-2 text-sm text-slate-700 transition outline-none placeholder:text-slate-400 hover:bg-white focus:border-sky-300 focus:bg-white focus:ring-2 focus:ring-sky-100"
+      class="w-full rounded-lg border border-transparent bg-white/60 px-3 py-2 text-sm text-slate-700 transition outline-none placeholder:text-slate-400 hover:bg-white focus:border-sky-300 focus:bg-white focus:ring-2 focus:ring-sky-100 dark:bg-slate-800/60 dark:text-slate-200 dark:placeholder:text-slate-500 dark:hover:bg-slate-800 dark:focus:border-sky-700 dark:focus:bg-slate-800 dark:focus:ring-sky-950"
       placeholder="＋ 添加任务"
       aria-label="添加任务"
       @compositionstart="composing = true"
diff --git a/src/components/SideDrawer.vue b/src/components/SideDrawer.vue
index d758b1a..7364b34 100644
--- a/src/components/SideDrawer.vue
+++ b/src/components/SideDrawer.vue
@@ -85,21 +85,23 @@ onBeforeUnmount(stopListening)
 <template>
   <Teleport to="body">
     <div v-if="open" class="fixed inset-0 z-40">
-      <div class="absolute inset-0 bg-slate-900/40" @click="emit('close')" />
+      <div class="absolute inset-0 bg-slate-900/40 dark:bg-black/60" @click="emit('close')" />
 
       <aside
         ref="panelRef"
-        class="absolute inset-y-0 right-0 flex w-full max-w-md flex-col bg-white shadow-xl outline-none"
+        class="absolute inset-y-0 right-0 flex w-full max-w-md flex-col bg-white shadow-panel outline-none dark:bg-slate-900"
         role="dialog"
         aria-modal="true"
         :aria-label="title"
         tabindex="-1"
       >
-        <header class="flex items-center justify-between border-b border-slate-200 px-4 py-3">
-          <h2 class="text-base font-medium text-slate-800">{{ title }}</h2>
+        <header
+          class="flex items-center justify-between border-b border-slate-200 px-4 py-3 dark:border-slate-800"
+        >
+          <h2 class="text-base font-medium text-slate-800 dark:text-slate-100">{{ title }}</h2>
           <button
             type="button"
-            class="rounded px-2 py-1 text-slate-400 transition hover:bg-slate-100 hover:text-slate-600"
+            class="rounded px-2 py-1 text-slate-400 transition hover:bg-slate-100 hover:text-slate-600 dark:hover:bg-slate-800 dark:hover:text-slate-200"
             aria-label="关闭"
             @click="emit('close')"
           >
@@ -111,7 +113,10 @@ onBeforeUnmount(stopListening)
           <slot />
         </div>
 
-        <footer v-if="$slots.footer" class="border-t border-slate-200 px-4 py-3">
+        <footer
+          v-if="$slots.footer"
+          class="border-t border-slate-200 px-4 py-3 dark:border-slate-800"
+        >
           <slot name="footer" />
         </footer>
       </aside>
diff --git a/src/components/TagFilter.vue b/src/components/TagFilter.vue
index f11f741..21b2586 100644
--- a/src/components/TagFilter.vue
+++ b/src/components/TagFilter.vue
@@ -47,8 +47,8 @@ onBeforeUnmount(() => {
       class="flex items-center gap-1.5 rounded-md border px-2.5 py-1.5 text-sm transition"
       :class="
         selected.length > 0
-          ? 'border-sky-300 bg-sky-50 text-sky-700'
-          : 'border-slate-200 bg-white text-slate-600 hover:border-slate-300 hover:bg-slate-50'
+          ? 'border-sky-300 bg-sky-50 text-sky-700 dark:border-sky-700 dark:bg-sky-950 dark:text-sky-300'
+          : 'border-slate-200 bg-white text-slate-600 hover:border-slate-300 hover:bg-slate-50 dark:border-slate-700 dark:bg-slate-900 dark:text-slate-300 dark:hover:border-slate-600 dark:hover:bg-slate-800'
       "
       :aria-expanded="open"
       aria-haspopup="true"
@@ -57,7 +57,7 @@ onBeforeUnmount(() => {
       标签
       <span
         v-if="selected.length > 0"
-        class="rounded-full bg-sky-600 px-1.5 text-[11px] leading-4 font-medium text-white"
+        class="rounded-full bg-sky-600 px-1.5 text-[11px] leading-4 font-medium text-white dark:bg-sky-500"
       >
         {{ selected.length }}
       </span>
@@ -80,20 +80,20 @@ onBeforeUnmount(() => {
 
     <div
       v-if="open"
-      class="absolute top-full left-0 z-20 mt-1.5 w-56 rounded-lg border border-slate-200 bg-white p-1.5 shadow-pop"
+      class="absolute top-full left-0 z-20 mt-1.5 w-56 rounded-lg border border-slate-200 bg-white p-1.5 shadow-pop dark:border-slate-700 dark:bg-slate-900"
     >
-      <p v-if="tags.length === 0" class="px-2 py-3 text-center text-xs text-slate-400">
+      <p v-if="tags.length === 0" class="px-2 py-3 text-center text-xs text-slate-400 dark:text-slate-500">
         还没有任何标签
       </p>
 
       <ul v-else class="max-h-64 overflow-y-auto">
         <li v-for="tag in tags" :key="tag">
           <label
-            class="flex cursor-pointer items-center gap-2 rounded-md px-2 py-1.5 text-sm text-slate-700 transition hover:bg-slate-50"
+            class="flex cursor-pointer items-center gap-2 rounded-md px-2 py-1.5 text-sm text-slate-700 transition hover:bg-slate-50 dark:text-slate-300 dark:hover:bg-slate-800"
           >
             <input
               type="checkbox"
-              class="size-3.5 accent-sky-600"
+              class="size-3.5 accent-sky-600 dark:accent-sky-500"
               :checked="selected.includes(tag)"
               @change="emit('toggle', tag)"
             />
@@ -105,7 +105,7 @@ onBeforeUnmount(() => {
       <button
         v-if="selected.length > 0"
         type="button"
-        class="mt-1 w-full rounded-md px-2 py-1.5 text-xs text-slate-500 transition hover:bg-slate-50 hover:text-slate-700"
+        class="mt-1 w-full rounded-md px-2 py-1.5 text-xs text-slate-500 transition hover:bg-slate-50 hover:text-slate-700 dark:text-slate-400 dark:hover:bg-slate-800 dark:hover:text-slate-200"
         @click="emit('clear')"
       >
         清除标签筛选
diff --git a/src/components/TagInput.vue b/src/components/TagInput.vue
index b95bb6c..fa3f550 100644
--- a/src/components/TagInput.vue
+++ b/src/components/TagInput.vue
@@ -36,17 +36,17 @@ function onBackspace(): void {
 
 <template>
   <div
-    class="flex flex-wrap items-center gap-1.5 rounded-md border border-slate-300 px-2 py-1.5 focus-within:border-sky-400"
+    class="flex flex-wrap items-center gap-1.5 rounded-md border border-slate-300 px-2 py-1.5 focus-within:border-sky-400 dark:border-slate-700 dark:bg-slate-800 dark:focus-within:border-sky-600"
   >
     <span
       v-for="tag in modelValue"
       :key="tag"
-      class="flex items-center gap-1 rounded bg-sky-50 px-1.5 py-0.5 text-xs text-sky-700"
+      class="flex items-center gap-1 rounded bg-sky-50 px-1.5 py-0.5 text-xs text-sky-700 dark:bg-sky-950 dark:text-sky-300"
     >
       #{{ tag }}
       <button
         type="button"
-        class="text-sky-500 transition hover:text-sky-800"
+        class="text-sky-500 transition hover:text-sky-800 dark:text-sky-400 dark:hover:text-sky-200"
         :aria-label="`移除标签 ${tag}`"
         @click="remove(tag)"
       >
@@ -57,7 +57,7 @@ function onBackspace(): void {
     <input
       v-model="draft"
       type="text"
-      class="min-w-24 flex-1 border-none bg-transparent px-1 py-0.5 text-sm text-slate-700 outline-none placeholder:text-slate-400"
+      class="min-w-24 flex-1 border-none bg-transparent px-1 py-0.5 text-sm text-slate-700 outline-none placeholder:text-slate-400 dark:text-slate-200 dark:placeholder:text-slate-500"
       :placeholder="modelValue.length === 0 ? (placeholder ?? '回车添加标签') : ''"
       aria-label="添加标签"
       @keydown.enter.prevent="composing ? undefined : commit()"
diff --git a/src/components/TaskCard.spec.ts b/src/components/TaskCard.spec.ts
index b416bcc..1a33568 100644
--- a/src/components/TaskCard.spec.ts
+++ b/src/components/TaskCard.spec.ts
@@ -148,3 +148,57 @@ describe('交互', () => {
     expect(mountCard().find('article').classes().join(' ')).toContain('cursor-pointer')
   })
 })
+
+describe('TaskCard 键盘操作', () => {
+  it('卡片可聚焦', () => {
+    expect(mountCard().find('article').attributes('tabindex')).toBe('0')
+  })
+
+  it('方向键 emit keymove 并带上方向', async () => {
+    const wrapper = mountCard({ id: 'task-1' })
+    const article = wrapper.find('article')
+
+    await article.trigger('keydown', { key: 'ArrowLeft' })
+    await article.trigger('keydown', { key: 'ArrowRight' })
+    await article.trigger('keydown', { key: 'ArrowUp' })
+    await article.trigger('keydown', { key: 'ArrowDown' })
+
+    expect(wrapper.emitted('keymove')).toEqual([
+      [{ id: 'task-1', direction: 'left' }],
+      [{ id: 'task-1', direction: 'right' }],
+      [{ id: 'task-1', direction: 'up' }],
+      [{ id: 'task-1', direction: 'down' }],
+    ])
+  })
+
+  it('Enter 与空格都能打开详情', async () => {
+    const wrapper = mountCard({ id: 'task-2' })
+    const article = wrapper.find('article')
+
+    await article.trigger('keydown', { key: 'Enter' })
+    await article.trigger('keydown', { key: ' ' })
+
+    expect(wrapper.emitted('open')).toEqual([['task-2'], ['task-2']])
+  })
+
+  it('其他按键不产生任何事件', async () => {
+    const wrapper = mountCard()
+    const article = wrapper.find('article')
+
+    await article.trigger('keydown', { key: 'a' })
+    await article.trigger('keydown', { key: 'Tab' })
+
+    expect(wrapper.emitted('keymove')).toBeUndefined()
+    expect(wrapper.emitted('open')).toBeUndefined()
+  })
+
+  it('方向键被 preventDefault（避免连带着滚动看板）', async () => {
+    const wrapper = mountCard()
+    const article = wrapper.find('article')
+
+    const event = new KeyboardEvent('keydown', { key: 'ArrowDown', cancelable: true })
+    article.element.dispatchEvent(event)
+
+    expect(event.defaultPrevented).toBe(true)
+  })
+})
diff --git a/src/components/TaskCard.vue b/src/components/TaskCard.vue
index 60548ed..f10cdc5 100644
--- a/src/components/TaskCard.vue
+++ b/src/components/TaskCard.vue
@@ -1,14 +1,44 @@
 <script setup lang="ts">
 import { computed } from 'vue'
 
-import { PRIORITY_LABELS, type Task } from '@/types/task'
+import { PRIORITY_LABELS, type MoveDirection, type Task } from '@/types/task'
 import { formatDueDate, isOverdue } from '@/utils/date'
 
 const MAX_VISIBLE_TAGS = 3
 
 const props = defineProps<{ task: Task }>()
 
-const emit = defineEmits<{ toggle: [id: string]; open: [id: string] }>()
+const emit = defineEmits<{
+  toggle: [id: string]
+  open: [id: string]
+  keymove: [payload: { id: string; direction: MoveDirection }]
+}>()
+
+/** 方向键映射；左右换列，上下调顺序 */
+const MOVE_KEYS: Readonly<Record<string, MoveDirection>> = {
+  ArrowLeft: 'left',
+  ArrowRight: 'right',
+  ArrowUp: 'up',
+  ArrowDown: 'down',
+}
+
+/**
+ * 卡片获得焦点后的键盘操作。
+ * 注意：方向键必须 preventDefault，否则会连带滚动整个看板。
+ */
+function onKeydown(event: KeyboardEvent): void {
+  if (event.key === 'Enter' || event.key === ' ') {
+    event.preventDefault()
+    emit('open', props.task.id)
+    return
+  }
+
+  const direction = MOVE_KEYS[event.key]
+  if (!direction) return
+
+  event.preventDefault()
+  emit('keymove', { id: props.task.id, direction })
+}
 
 const isDone = computed(() => props.task.status === 'done')
 const overdue = computed(() => isOverdue(props.task.dueDate, props.task.status))
@@ -26,28 +56,34 @@ const priorityBarClass = computed(() => {
     case 2:
       return 'bg-amber-400'
     default:
-      return 'bg-slate-300'
+      return 'bg-slate-300 dark:bg-slate-600'
   }
 })
 
 const priorityTextClass = computed(() => {
   switch (props.task.priority) {
     case 3:
-      return 'text-rose-600'
+      return 'text-rose-600 dark:text-rose-400'
     case 2:
-      return 'text-amber-700'
+      return 'text-amber-700 dark:text-amber-400'
     default:
-      return 'text-slate-400'
+      return 'text-slate-400 dark:text-slate-500'
   }
 })
 </script>
 
 <template>
   <article
-    class="relative shrink-0 cursor-pointer overflow-hidden rounded-lg border border-slate-200 bg-white shadow-card transition duration-150"
-    :class="isDone ? 'opacity-60' : 'hover:-translate-y-px hover:border-slate-300 hover:shadow-card-hover'"
+    class="relative shrink-0 cursor-pointer overflow-hidden rounded-lg border border-slate-200 bg-white shadow-card transition duration-150 dark:border-slate-800 dark:bg-slate-900"
+    :class="
+      isDone
+        ? 'opacity-60'
+        : 'hover:-translate-y-px hover:border-slate-300 hover:shadow-card-hover dark:hover:border-slate-700'
+    "
     :data-task-id="task.id"
+    tabindex="0"
     @click="emit('open', task.id)"
+    @keydown="onKeydown"
   >
     <span class="absolute inset-y-0 left-0 w-[3px]" :class="priorityBarClass" aria-hidden="true" />
 
@@ -59,7 +95,7 @@ const priorityTextClass = computed(() => {
           :class="
             isDone
               ? 'border-emerald-500 bg-emerald-500 text-white'
-              : 'border-slate-300 hover:border-emerald-500 hover:bg-emerald-50'
+              : 'border-slate-300 hover:border-emerald-500 hover:bg-emerald-50 dark:border-slate-600 dark:hover:border-emerald-500 dark:hover:bg-emerald-950'
           "
           :aria-label="isDone ? '标记为未完成' : '标记为已完成'"
           :aria-pressed="isDone"
@@ -78,7 +114,11 @@ const priorityTextClass = computed(() => {
 
         <h3
           class="min-w-0 flex-1 text-sm leading-snug wrap-break-word"
-          :class="isDone ? 'text-slate-400 line-through' : 'text-slate-800'"
+          :class="
+            isDone
+              ? 'text-slate-400 line-through dark:text-slate-500'
+              : 'text-slate-800 dark:text-slate-100'
+          "
         >
           {{ task.title }}
         </h3>
@@ -91,14 +131,21 @@ const priorityTextClass = computed(() => {
 
         <span
           v-if="task.dueDate"
-          class="font-medium"
-          :class="overdue ? 'text-rose-600' : 'text-slate-500'"
+          :class="
+            overdue
+              ? 'font-medium text-rose-600 dark:text-rose-400'
+              : 'text-slate-500 dark:text-slate-400'
+          "
         >
           {{ formatDueDate(task.dueDate) }}
         </span>
 
-        <span v-for="tag in visibleTags" :key="tag" class="text-slate-400">#{{ tag }}</span>
-        <span v-if="hiddenTagCount > 0" class="text-slate-400">+{{ hiddenTagCount }}</span>
+        <span v-for="tag in visibleTags" :key="tag" class="text-slate-400 dark:text-slate-500">
+          #{{ tag }}
+        </span>
+        <span v-if="hiddenTagCount > 0" class="text-slate-400 dark:text-slate-500">
+          +{{ hiddenTagCount }}
+        </span>
       </div>
     </div>
   </article>
diff --git a/src/components/TaskDetailDrawer.vue b/src/components/TaskDetailDrawer.vue
index 58daf35..be8420d 100644
--- a/src/components/TaskDetailDrawer.vue
+++ b/src/components/TaskDetailDrawer.vue
@@ -82,29 +82,29 @@ function remove(): void {
   <SideDrawer :open="task !== null" title="任务详情" @close="emit('close')">
     <form v-if="task" class="flex flex-col gap-4" @submit.prevent="save">
       <label class="flex flex-col gap-1.5">
-        <span class="text-sm font-medium text-slate-600">标题</span>
+        <span class="text-sm font-medium text-slate-600 dark:text-slate-400">标题</span>
         <input
           v-model="title"
           type="text"
-          class="rounded-md border border-slate-300 px-2.5 py-1.5 text-sm text-slate-700 outline-none focus:border-sky-400"
+          class="rounded-md border border-slate-300 px-2.5 py-1.5 text-sm text-slate-700 outline-none focus:border-sky-400 dark:border-slate-700 dark:bg-slate-800 dark:text-slate-200 dark:focus:border-sky-600"
           aria-label="标题"
           @input="titleError = null"
         />
-        <span v-if="titleError" class="text-xs text-rose-600">{{ titleError }}</span>
+        <span v-if="titleError" class="text-xs text-rose-600 dark:text-rose-400">{{ titleError }}</span>
       </label>
 
       <label class="flex flex-col gap-1.5">
-        <span class="text-sm font-medium text-slate-600">描述</span>
+        <span class="text-sm font-medium text-slate-600 dark:text-slate-400">描述</span>
         <textarea
           v-model="description"
           rows="4"
-          class="resize-y rounded-md border border-slate-300 px-2.5 py-1.5 text-sm text-slate-700 outline-none focus:border-sky-400"
+          class="resize-y rounded-md border border-slate-300 px-2.5 py-1.5 text-sm text-slate-700 outline-none focus:border-sky-400 dark:border-slate-700 dark:bg-slate-800 dark:text-slate-200 dark:focus:border-sky-600"
           aria-label="描述"
         />
       </label>
 
       <fieldset class="flex flex-col gap-1.5">
-        <legend class="mb-1.5 text-sm font-medium text-slate-600">优先级</legend>
+        <legend class="mb-1.5 text-sm font-medium text-slate-600 dark:text-slate-400">优先级</legend>
         <div class="flex gap-2">
           <button
             v-for="value in PRIORITIES"
@@ -113,8 +113,8 @@ function remove(): void {
             class="rounded-md border px-3 py-1 text-sm transition"
             :class="
               priority === value
-                ? 'border-sky-400 bg-sky-50 text-sky-700'
-                : 'border-slate-300 text-slate-600 hover:bg-slate-50'
+                ? 'border-sky-400 bg-sky-50 text-sky-700 dark:border-sky-600 dark:bg-sky-950 dark:text-sky-300'
+                : 'border-slate-300 text-slate-600 hover:bg-slate-50 dark:border-slate-600 dark:text-slate-400 dark:hover:bg-slate-800'
             "
             :aria-pressed="priority === value"
             @click="priority = value"
@@ -125,12 +125,12 @@ function remove(): void {
       </fieldset>
 
       <div class="flex flex-col gap-1.5">
-        <span class="text-sm font-medium text-slate-600">截止日期</span>
+        <span class="text-sm font-medium text-slate-600 dark:text-slate-400">截止日期</span>
         <DatePicker v-model="dueDate" />
       </div>
 
       <div class="flex flex-col gap-1.5">
-        <span class="text-sm font-medium text-slate-600">标签</span>
+        <span class="text-sm font-medium text-slate-600 dark:text-slate-400">标签</span>
         <TagInput v-model="tags" />
       </div>
     </form>
@@ -139,7 +139,7 @@ function remove(): void {
       <div class="flex items-center justify-between">
         <button
           type="button"
-          class="rounded-md px-2.5 py-1.5 text-sm text-rose-600 transition hover:bg-rose-50"
+          class="rounded-md px-2.5 py-1.5 text-sm text-rose-600 transition hover:bg-rose-50 dark:text-rose-400 dark:hover:bg-rose-950"
           @click="remove"
         >
           删除
@@ -148,14 +148,14 @@ function remove(): void {
         <div class="flex gap-2">
           <button
             type="button"
-            class="rounded-md border border-slate-300 px-3 py-1.5 text-sm text-slate-600 transition hover:bg-slate-50"
+            class="rounded-md border border-slate-300 px-3 py-1.5 text-sm text-slate-600 transition hover:bg-slate-50 dark:border-slate-600 dark:text-slate-300 dark:hover:bg-slate-800"
             @click="emit('close')"
           >
             取消
           </button>
           <button
             type="button"
-            class="rounded-md bg-sky-600 px-3 py-1.5 text-sm font-medium text-white transition hover:bg-sky-700"
+            class="rounded-md bg-sky-600 px-3 py-1.5 text-sm font-medium text-white transition hover:bg-sky-700 dark:hover:bg-sky-500"
             @click="save"
           >
             保存
diff --git a/src/components/ToastHost.vue b/src/components/ToastHost.vue
index 15324c1..8152096 100644
--- a/src/components/ToastHost.vue
+++ b/src/components/ToastHost.vue
@@ -15,14 +15,14 @@ const { toasts } = storeToRefs(store)
       v-for="toast in toasts"
       :key="toast.id"
       role="status"
-      class="pointer-events-auto flex w-full max-w-sm items-center gap-3 rounded-md bg-slate-800 px-3 py-2 text-sm text-white shadow-lg"
+      class="pointer-events-auto flex w-full max-w-sm items-center gap-3 rounded-md bg-slate-800 px-3 py-2 text-sm text-white shadow-panel dark:bg-slate-100 dark:text-slate-900"
     >
       <span class="min-w-0 flex-1 wrap-break-word">{{ toast.message }}</span>
 
       <button
         v-if="toast.action"
         type="button"
-        class="shrink-0 rounded px-2 py-0.5 text-sm font-medium text-sky-300 transition hover:bg-white/10"
+        class="shrink-0 rounded px-2 py-0.5 text-sm font-medium text-sky-300 transition hover:bg-white/10 dark:text-sky-700 dark:hover:bg-slate-900/10"
         @click="store.runAction(toast.id)"
       >
         {{ toast.action.label }}
@@ -30,7 +30,7 @@ const { toasts } = storeToRefs(store)
 
       <button
         type="button"
-        class="shrink-0 rounded px-1.5 text-slate-400 transition hover:text-white"
+        class="shrink-0 rounded px-1.5 text-slate-400 transition hover:text-white dark:text-slate-500 dark:hover:text-slate-900"
         aria-label="关闭提示"
         @click="store.dismiss(toast.id)"
       >
diff --git a/src/stores/theme.spec.ts b/src/stores/theme.spec.ts
new file mode 100644
index 0000000..1936bed
--- /dev/null
+++ b/src/stores/theme.spec.ts
@@ -0,0 +1,158 @@
+import { createPinia, setActivePinia } from 'pinia'
+import { afterEach, beforeEach, describe, expect, it, vi } from 'vitest'
+
+import {
+  DARK_CLASS,
+  THEME_CYCLE,
+  THEME_STORAGE_KEY,
+  isThemeMode,
+  resolveDark,
+  useThemeStore,
+} from './theme'
+
+function stubMatchMedia(matches: boolean): void {
+  vi.stubGlobal(
+    'matchMedia',
+    vi.fn(() => ({
+      matches,
+      addEventListener: vi.fn(),
+      removeEventListener: vi.fn(),
+    })),
+  )
+}
+
+function isDarkApplied(): boolean {
+  return document.documentElement.classList.contains(DARK_CLASS)
+}
+
+let stores: Array<ReturnType<typeof useThemeStore>> = []
+
+function setup(): ReturnType<typeof useThemeStore> {
+  setActivePinia(createPinia())
+  const store = useThemeStore()
+  stores.push(store)
+  return store
+}
+
+beforeEach(() => {
+  localStorage.clear()
+  document.documentElement.classList.remove(DARK_CLASS)
+  stubMatchMedia(false)
+})
+
+afterEach(() => {
+  for (const store of stores) store.dispose()
+  stores = []
+  vi.unstubAllGlobals()
+})
+
+describe('isThemeMode', () => {
+  it('接受三个合法值', () => {
+    expect(isThemeMode('system')).toBe(true)
+    expect(isThemeMode('light')).toBe(true)
+    expect(isThemeMode('dark')).toBe(true)
+  })
+
+  it('拒绝其它值', () => {
+    expect(isThemeMode('DARK')).toBe(false)
+    expect(isThemeMode(null)).toBe(false)
+    expect(isThemeMode('')).toBe(false)
+  })
+})
+
+describe('resolveDark', () => {
+  it('强制深色/浅色不受系统影响', () => {
+    stubMatchMedia(false)
+    expect(resolveDark('dark')).toBe(true)
+    expect(resolveDark('light')).toBe(false)
+
+    stubMatchMedia(true)
+    expect(resolveDark('dark')).toBe(true)
+    expect(resolveDark('light')).toBe(false)
+  })
+
+  it('跟随系统时取决于系统偏好', () => {
+    stubMatchMedia(true)
+    expect(resolveDark('system')).toBe(true)
+
+    stubMatchMedia(false)
+    expect(resolveDark('system')).toBe(false)
+  })
+})
+
+describe('theme store', () => {
+  it('默认跟随系统', () => {
+    const store = setup()
+    expect(store.mode).toBe('system')
+  })
+
+  it('切换到深色会给 html 加上 dark 类', () => {
+    const store = setup()
+    store.setMode('dark')
+
+    expect(store.isDark).toBe(true)
+    expect(isDarkApplied()).toBe(true)
+  })
+
+  it('切换回浅色会移除 dark 类', () => {
+    const store = setup()
+    store.setMode('dark')
+    store.setMode('light')
+
+    expect(store.isDark).toBe(false)
+    expect(isDarkApplied()).toBe(false)
+  })
+
+  it('选择会持久化到 localStorage', () => {
+    const store = setup()
+    store.setMode('dark')
+    expect(localStorage.getItem(THEME_STORAGE_KEY)).toBe('dark')
+  })
+
+  it('init 会读取已保存的偏好', () => {
+    localStorage.setItem(THEME_STORAGE_KEY, 'dark')
+    const store = setup()
+    store.init()
+
+    expect(store.mode).toBe('dark')
+    expect(store.isDark).toBe(true)
+    expect(isDarkApplied()).toBe(true)
+  })
+
+  it('保存的值非法时回退到跟随系统', () => {
+    localStorage.setItem(THEME_STORAGE_KEY, 'neon')
+    const store = setup()
+    store.init()
+
+    expect(store.mode).toBe('system')
+  })
+
+  it('跟随系统时按系统偏好渲染', () => {
+    stubMatchMedia(true)
+    const store = setup()
+    store.init()
+
+    expect(store.mode).toBe('system')
+    expect(store.isDark).toBe(true)
+    expect(isDarkApplied()).toBe(true)
+  })
+
+  it('cycle 按 系统 → 浅色 → 深色 → 系统 循环', () => {
+    const store = setup()
+    store.init()
+    expect(store.mode).toBe('system')
+
+    store.cycle()
+    expect(store.mode).toBe('light')
+
+    store.cycle()
+    expect(store.mode).toBe('dark')
+
+    store.cycle()
+    expect(store.mode).toBe('system')
+  })
+
+  it('循环顺序常量与实现一致', () => {
+    expect([...THEME_CYCLE]).toEqual(['system', 'light', 'dark'])
+  })
+})
diff --git a/src/stores/theme.ts b/src/stores/theme.ts
new file mode 100644
index 0000000..b91a977
--- /dev/null
+++ b/src/stores/theme.ts
@@ -0,0 +1,111 @@
+/**
+ * 主题（深色模式）
+ *
+ * 三态：跟随系统 / 强制浅色 / 强制深色。
+ * 选择保存在 localStorage，index.html 里的内联脚本会在首帧前应用，
+ * 避免深色模式下先闪一下白屏。
+ */
+
+import { defineStore } from 'pinia'
+import { ref } from 'vue'
+
+export type ThemeMode = 'system' | 'light' | 'dark'
+
+/** 与 index.html 内联脚本、useTheme 保持一致 */
+export const THEME_STORAGE_KEY = 'kanban.theme'
+export const DARK_CLASS = 'dark'
+
+/** 循环切换的顺序 */
+export const THEME_CYCLE: readonly ThemeMode[] = ['system', 'light', 'dark']
+
+export const THEME_LABELS: Readonly<Record<ThemeMode, string>> = {
+  system: '跟随系统',
+  light: '浅色',
+  dark: '深色',
+}
+
+export function isThemeMode(value: unknown): value is ThemeMode {
+  return value === 'system' || value === 'light' || value === 'dark'
+}
+
+function readStoredMode(): ThemeMode {
+  if (typeof localStorage === 'undefined') return 'system'
+  try {
+    const raw = localStorage.getItem(THEME_STORAGE_KEY)
+    return isThemeMode(raw) ? raw : 'system'
+  } catch {
+    return 'system'
+  }
+}
+
+/** 系统当前是否偏好深色 */
+export function systemPrefersDark(): boolean {
+  if (typeof window === 'undefined' || typeof window.matchMedia !== 'function') return false
+  return window.matchMedia('(prefers-color-scheme: dark)').matches
+}
+
+/** 该模式下是否应渲染为深色 */
+export function resolveDark(mode: ThemeMode): boolean {
+  return mode === 'dark' || (mode === 'system' && systemPrefersDark())
+}
+
+function applyToDocument(mode: ThemeMode): void {
+  if (typeof document === 'undefined') return
+  document.documentElement.classList.toggle(DARK_CLASS, resolveDark(mode))
+}
+
+function persist(mode: ThemeMode): void {
+  try {
+    localStorage.setItem(THEME_STORAGE_KEY, mode)
+  } catch {
+    // 隐私模式下写不了，不影响本次使用
+  }
+}
+
+export const useThemeStore = defineStore('theme', () => {
+  const mode = ref<ThemeMode>(readStoredMode())
+
+  /** 主题是否真的处于深色（跟随系统时取决于系统设置） */
+  const isDark = ref(resolveDark(mode.value))
+
+  let mediaQuery: MediaQueryList | null = null
+
+  function sync(): void {
+    isDark.value = resolveDark(mode.value)
+    applyToDocument(mode.value)
+  }
+
+  function onSystemChange(): void {
+    if (mode.value === 'system') sync()
+  }
+
+  function init(): void {
+    mode.value = readStoredMode()
+    sync()
+
+    if (typeof window !== 'undefined' && typeof window.matchMedia === 'function') {
+      mediaQuery = window.matchMedia('(prefers-color-scheme: dark)')
+      mediaQuery.addEventListener?.('change', onSystemChange)
+    }
+  }
+
+  function setMode(next: ThemeMode): void {
+    mode.value = next
+    persist(next)
+    sync()
+  }
+
+  function cycle(): void {
+    const current = THEME_CYCLE.indexOf(mode.value)
+    const next = THEME_CYCLE[(current + 1) % THEME_CYCLE.length] ?? 'system'
+    setMode(next)
+  }
+
+  /** 释放系统监听，主要供测试使用 */
+  function dispose(): void {
+    mediaQuery?.removeEventListener?.('change', onSystemChange)
+    mediaQuery = null
+  }
+
+  return { mode, isDark, init, setMode, cycle, dispose }
+})
diff --git a/src/style.css b/src/style.css
index 51d3833..131910d 100644
--- a/src/style.css
+++ b/src/style.css
@@ -1,5 +1,11 @@
 @import 'tailwindcss';
 
+/*
+ * 深色模式用 class 控制而不是纯 media query ——
+ * 这样才能支持「跟随系统 / 强制浅色 / 强制深色」三态。
+ */
+@custom-variant dark (&:where(.dark, .dark *));
+
 @theme {
   --font-sans:
     system-ui, 'Segoe UI', 'Microsoft YaHei', 'PingFang SC', Roboto, sans-serif;
@@ -18,13 +24,28 @@
     height: 100%;
   }
 
+  html {
+    color-scheme: light;
+  }
+
+  html.dark {
+    color-scheme: dark;
+  }
+
   body {
     margin: 0;
+    background: var(--color-slate-100);
+    color: var(--color-slate-900);
     -webkit-font-smoothing: antialiased;
     -moz-osx-font-smoothing: grayscale;
     text-rendering: optimizeLegibility;
   }
 
+  html.dark body {
+    background: var(--color-slate-950);
+    color: var(--color-slate-100);
+  }
+
   /* 统一的键盘焦点样式，鼠标点击不显示 */
   :focus-visible {
     outline: 2px solid var(--color-sky-500);
@@ -36,9 +57,17 @@
     background: var(--color-sky-200);
   }
 
+  html.dark ::selection {
+    background: var(--color-sky-800);
+  }
+
   /* 细滚动条，避免在列里出现粗重的系统滚动条 */
   * {
     scrollbar-width: thin;
     scrollbar-color: var(--color-slate-300) transparent;
   }
+
+  html.dark * {
+    scrollbar-color: var(--color-slate-700) transparent;
+  }
 }
diff --git a/src/types/task.ts b/src/types/task.ts
index 1231b42..960e174 100644
--- a/src/types/task.ts
+++ b/src/types/task.ts
@@ -13,6 +13,12 @@ export type ColumnId = (typeof COLUMN_IDS)[number]
 /** 优先级：1 = 低，2 = 中，3 = 高 */
 export type Priority = 1 | 2 | 3
 
+/**
+ * 键盘移动方向：左右换列，上下调同列顺序。
+ * 用户可以在卡片上聚焦后用方向键调整，不必依赖拖拽。
+ */
+export type MoveDirection = 'left' | 'right' | 'up' | 'down'
+
 export interface Task {
   id: string
   title: string
diff --git a/src/utils/today.spec.ts b/src/utils/today.spec.ts
index 02d69f0..4082b27 100644
--- a/src/utils/today.spec.ts
+++ b/src/utils/today.spec.ts
@@ -44,15 +44,44 @@ describe('buildTodayBuckets 分组', () => {
     expect(ids(buildTodayBuckets([task], TODAY).inProgress)).toEqual(['a'])
   })
 
-  it('未开始且没有截止日期的任务不出现', () => {
+  it('未开始且没有截止日期的任务进入 pending 组', () => {
     const task = makeTask({ id: 'a', status: 'todo', dueDate: null })
     const buckets = buildTodayBuckets([task], TODAY)
-    expect(countTodayTasks(buckets)).toBe(0)
+
+    expect(ids(buckets.pending)).toEqual(['a'])
+    expect(countTodayTasks(buckets)).toBe(1)
   })
 
-  it('未来截止但未开始的任务不出现', () => {
+  it('未来截止但未开始的任务进入 pending 组', () => {
     const task = makeTask({ id: 'a', status: 'todo', dueDate: '2026-12-01' })
-    expect(countTodayTasks(buildTodayBuckets([task], TODAY))).toBe(0)
+    expect(ids(buildTodayBuckets([task], TODAY).pending)).toEqual(['a'])
+  })
+
+  it('所有未完成且未归档的任务都会出现在某个分组里', () => {
+    const tasks = [
+      makeTask({ id: 'overdue', dueDate: '2026-10-01' }),
+      makeTask({ id: 'today', dueDate: TODAY }),
+      makeTask({ id: 'doing', status: 'doing' }),
+      makeTask({ id: 'todo-future', status: 'todo', dueDate: '2026-12-01' }),
+      makeTask({ id: 'todo-none', status: 'todo', dueDate: null }),
+    ]
+
+    const buckets = buildTodayBuckets(tasks, TODAY)
+    const all = [
+      ...buckets.overdue,
+      ...buckets.dueToday,
+      ...buckets.inProgress,
+      ...buckets.pending,
+    ]
+
+    // 按字典序：today 排在 todo-* 之前
+    expect(all.map((task) => task.id).sort()).toEqual([
+      'doing',
+      'overdue',
+      'today',
+      'todo-future',
+      'todo-none',
+    ])
   })
 
   it('已完成任务不出现', () => {
diff --git a/src/utils/today.ts b/src/utils/today.ts
index fe3a267..d3cd318 100644
--- a/src/utils/today.ts
+++ b/src/utils/today.ts
@@ -18,6 +18,14 @@ export interface TodayBuckets {
   dueToday: Task[]
   /** 正在进行、且没有更紧急的截止日期 */
   inProgress: Task[]
+  /**
+   * 还没开始、也没有紧迫截止时间的任务。
+   *
+   * 这个分组是补上的：早期版本只收「逾期 / 今天到期 / 进行中」，
+   * 导致待办列里没设截止日期的任务在今日视图里完全消失 ——
+   * 用户明明有一堆事没做，却看到「今天没有待办事项」。
+   */
+  pending: Task[]
 }
 
 /**
@@ -47,6 +55,7 @@ export function buildTodayBuckets(tasks: readonly Task[], today: string = todayI
   const overdue: Task[] = []
   const dueToday: Task[] = []
   const inProgress: Task[] = []
+  const pending: Task[] = []
 
   for (const task of tasks) {
     if (!isActionable(task)) continue
@@ -57,6 +66,9 @@ export function buildTodayBuckets(tasks: readonly Task[], today: string = todayI
       dueToday.push(task)
     } else if (task.status === 'doing') {
       inProgress.push(task)
+    } else {
+      // 未开始，且截止日期在未来或未设置
+      pending.push(task)
     }
   }
 
@@ -64,10 +76,16 @@ export function buildTodayBuckets(tasks: readonly Task[], today: string = todayI
     overdue: sortByUrgency(overdue),
     dueToday: sortByUrgency(dueToday),
     inProgress: sortByUrgency(inProgress),
+    pending: sortByUrgency(pending),
   }
 }
 
 /** 今日视图中的任务总数 */
 export function countTodayTasks(buckets: TodayBuckets): number {
-  return buckets.overdue.length + buckets.dueToday.length + buckets.inProgress.length
+  return (
+    buckets.overdue.length +
+    buckets.dueToday.length +
+    buckets.inProgress.length +
+    buckets.pending.length
+  )
 }
diff --git a/src/views/BoardView.spec.ts b/src/views/BoardView.spec.ts
index 1e56c33..0f09f5b 100644
--- a/src/views/BoardView.spec.ts
+++ b/src/views/BoardView.spec.ts
@@ -425,3 +425,132 @@ describe('BoardView 快捷键', () => {
     expect(document.activeElement).not.toBe(wrapper.find('input[aria-label="添加任务"]').element)
   })
 })
+
+describe('BoardView 键盘移动', () => {
+  type Direction = 'left' | 'right' | 'up' | 'down'
+
+  /** 模拟卡片发出 keymove（任意一列转发都会到达 BoardView 的处理函数） */
+  function emitKeyMove(
+    wrapper: ReturnType<typeof mountBoard>,
+    id: string,
+    direction: Direction,
+  ): void {
+    wrapper.findAllComponents(BoardColumn)[0]?.vm.$emit('keymove', { id, direction })
+  }
+
+  it('右移把任务移到下一列末尾', async () => {
+    const { pinia, store } = setup()
+    const task = store.createTask({ title: 'A' })
+    const wrapper = mountBoard(pinia)
+
+    emitKeyMove(wrapper, task?.id ?? '', 'right')
+    await nextTick()
+
+    expect(store.byColumn.todo).toHaveLength(0)
+    expect(store.byColumn.doing.map((item) => item.title)).toEqual(['A'])
+  })
+
+  it('左移把任务移回上一列', async () => {
+    const { pinia, store } = setup()
+    const task = store.createTask({ title: 'A', status: 'doing' })
+    const wrapper = mountBoard(pinia)
+
+    emitKeyMove(wrapper, task?.id ?? '', 'left')
+    await nextTick()
+
+    expect(store.byColumn.doing).toHaveLength(0)
+    expect(store.byColumn.todo.map((item) => item.title)).toEqual(['A'])
+  })
+
+  it('最左列再左移无效果', async () => {
+    const { pinia, store } = setup()
+    const task = store.createTask({ title: 'A' })
+    const wrapper = mountBoard(pinia)
+
+    emitKeyMove(wrapper, task?.id ?? '', 'left')
+    await nextTick()
+
+    expect(store.byColumn.todo.map((item) => item.title)).toEqual(['A'])
+  })
+
+  it('最右列再右移无效果', async () => {
+    const { pinia, store } = setup()
+    const task = store.createTask({ title: 'A', status: 'done' })
+    const wrapper = mountBoard(pinia)
+
+    emitKeyMove(wrapper, task?.id ?? '', 'right')
+    await nextTick()
+
+    expect(store.byColumn.done.map((item) => item.title)).toEqual(['A'])
+  })
+
+  it('上移调整列内顺序', async () => {
+    const { pinia, store } = setup()
+    const a = store.createTask({ title: 'A' })
+    store.createTask({ title: 'B' })
+    store.createTask({ title: 'C' })
+    // 快速新增插入列首，当前顺序为 C, B, A
+    const wrapper = mountBoard(pinia)
+
+    emitKeyMove(wrapper, a?.id ?? '', 'up')
+    await nextTick()
+
+    expect(store.byColumn.todo.map((item) => item.title)).toEqual(['C', 'A', 'B'])
+  })
+
+  it('下移调整列内顺序', async () => {
+    const { pinia, store } = setup()
+    store.createTask({ title: 'A' })
+    store.createTask({ title: 'B' })
+    const c = store.createTask({ title: 'C' })
+    // 当前顺序 C, B, A
+    const wrapper = mountBoard(pinia)
+
+    emitKeyMove(wrapper, c?.id ?? '', 'down')
+    await nextTick()
+
+    expect(store.byColumn.todo.map((item) => item.title)).toEqual(['B', 'C', 'A'])
+  })
+
+  it('已在列首时上移无效果', async () => {
+    const { pinia, store } = setup()
+    store.createTask({ title: 'A' })
+    const first = store.createTask({ title: 'B' })
+    const wrapper = mountBoard(pinia)
+
+    emitKeyMove(wrapper, first?.id ?? '', 'up')
+    await nextTick()
+
+    expect(store.byColumn.todo.map((item) => item.title)).toEqual(['B', 'A'])
+  })
+
+  it('列内渲染子集时禁止上下移动（避免写坏全量顺序）', async () => {
+    const { pinia, store } = setup()
+    const a = store.createTask({ title: 'A', priority: 3 })
+    store.createTask({ title: 'B', priority: 1 })
+    const wrapper = mountBoard(pinia)
+
+    useFilterStore().togglePriority(3)
+    await nextTick()
+
+    emitKeyMove(wrapper, a?.id ?? '', 'down')
+    await nextTick()
+
+    // 顺序保持原样
+    expect(store.byColumn.todo.map((item) => item.title)).toEqual(['B', 'A'])
+  })
+
+  it('跨列移动在筛选态下依然可用', async () => {
+    const { pinia, store } = setup()
+    const task = store.createTask({ title: 'A', priority: 3 })
+    const wrapper = mountBoard(pinia)
+
+    useFilterStore().togglePriority(3)
+    await nextTick()
+
+    emitKeyMove(wrapper, task?.id ?? '', 'right')
+    await nextTick()
+
+    expect(store.byColumn.doing.map((item) => item.title)).toEqual(['A'])
+  })
+})
diff --git a/src/views/BoardView.vue b/src/views/BoardView.vue
index deb2cf2..0cb9a9f 100644
--- a/src/views/BoardView.vue
+++ b/src/views/BoardView.vue
@@ -1,6 +1,6 @@
 <script setup lang="ts">
 import { storeToRefs } from 'pinia'
-import { computed, ref } from 'vue'
+import { computed, nextTick, ref } from 'vue'
 
 import BoardColumn from '@/components/BoardColumn.vue'
 import BoardToolbar from '@/components/BoardToolbar.vue'
@@ -10,7 +10,7 @@ import { useFilterStore } from '@/stores/filters'
 import { useTaskStore } from '@/stores/tasks'
 import { useToastStore } from '@/stores/toast'
 import { useUiStore } from '@/stores/ui'
-import { COLUMNS, type ColumnId } from '@/types/task'
+import { COLUMNS, type ColumnId, type MoveDirection } from '@/types/task'
 import { findArchivableTasks } from '@/utils/archive'
 import { filterTasks } from '@/utils/filter'
 import { groupByColumn } from '@/utils/sortOrder'
@@ -100,6 +100,37 @@ function closeDetail(): void {
 function handleMove(payload: { id: string; toColumn: ColumnId; toIndex: number }): void {
   store.moveTask(payload.id, payload.toColumn, payload.toIndex)
 }
+
+/**
+ * 键盘移动（方向键）。
+ *
+ * 左右换列时追加到目标列末尾 —— 用全量长度而不是可见下标，
+ * 因此即使当前处于筛选态也不会把顺序写坏。
+ * 上下调顺序则要求该列渲染的是全量，否则下标没有意义。
+ */
+function handleKeyMove(payload: { id: string; direction: MoveDirection }): void {
+  const task = store.tasks.find((item) => item.id === payload.id)
+  if (!task) return
+
+  if (payload.direction === 'left' || payload.direction === 'right') {
+    const currentIndex = COLUMNS.findIndex((column) => column.id === task.status)
+    const target = COLUMNS[currentIndex + (payload.direction === 'left' ? -1 : 1)]
+    if (!target) return
+    store.moveTask(task.id, target.id, store.byColumn[target.id].length)
+  } else {
+    if (hiddenCounts.value[task.status] > 0) return
+    const column = store.byColumn[task.status]
+    const currentIndex = column.findIndex((item) => item.id === task.id)
+    const nextIndex = currentIndex + (payload.direction === 'up' ? -1 : 1)
+    if (nextIndex < 0 || nextIndex >= column.length) return
+    store.moveTask(task.id, task.status, nextIndex)
+  }
+
+  // 卡片跨列后会被重建，焦点必须手动找回，否则连续按键会失效
+  void nextTick(() => {
+    document.querySelector<HTMLElement>(`[data-task-id="${payload.id}"]`)?.focus()
+  })
+}
 </script>
 
 <template>
@@ -132,6 +163,7 @@ function handleMove(payload: { id: string; toColumn: ColumnId; toIndex: number }
         @toggle="toggleTask"
         @open="openTask"
         @move="handleMove"
+        @keymove="handleKeyMove"
       />
     </div>
 
diff --git a/src/views/TodayView.spec.ts b/src/views/TodayView.spec.ts
index 15c5ef0..a2ad434 100644
--- a/src/views/TodayView.spec.ts
+++ b/src/views/TodayView.spec.ts
@@ -54,7 +54,7 @@ describe('TodayView 顶部', () => {
   it('显示四张统计卡片', () => {
     const { wrapper } = setup()
     const labels = wrapper.findAll('dt').map((node) => node.text())
-    expect(labels).toEqual(['今日待办', '逾期', '今天到期', '本周完成'])
+    expect(labels).toEqual(['逾期', '今天到期', '进行中', '本周完成'])
   })
 
   it('统计卡片数值正确', () => {
@@ -66,8 +66,8 @@ describe('TodayView 顶部', () => {
     ])
 
     const values = wrapper.findAll('dd').map((node) => node.text())
-    // 今日待办 3（逾期 + 今天到期 + 进行中），逾期 1，今天到期 1，本周完成 1
-    expect(values).toEqual(['3', '1', '1', '1'])
+    // 逾期 1、今天到期 1、进行中 1、本周完成 1
+    expect(values).toEqual(['1', '1', '1', '1'])
   })
 })
 
@@ -106,14 +106,19 @@ describe('TodayView 分组', () => {
     expect(wrapper.findAll('article')).toHaveLength(0)
   })
 
-  it('未开始且无截止日期的任务不出现', () => {
+  it('未开始且无截止日期的任务出现在「待办」组（不再凭空消失）', () => {
     const { wrapper } = setup([{ title: '以后再说' }])
-    expect(wrapper.findAll('article')).toHaveLength(0)
+
+    expect(wrapper.findAll('article')).toHaveLength(1)
+    expect(wrapper.text()).toContain('以后再说')
+    expect(sectionTitles(wrapper).some((title) => title.includes('待办'))).toBe(true)
   })
 
-  it('未来截止但未开始的任务不出现', () => {
+  it('未来截止但未开始的任务也进入「待办」组', () => {
     const { wrapper } = setup([{ title: '下周的事', dueDate: tomorrow }])
-    expect(wrapper.findAll('article')).toHaveLength(0)
+
+    expect(wrapper.findAll('article')).toHaveLength(1)
+    expect(wrapper.text()).toContain('下周的事')
   })
 
   it('同一任务只出现一次', () => {
diff --git a/src/views/TodayView.vue b/src/views/TodayView.vue
index 6eff9b1..41f907a 100644
--- a/src/views/TodayView.vue
+++ b/src/views/TodayView.vue
@@ -6,6 +6,7 @@ import { computed, ref } from 'vue'
 import TaskCard from '@/components/TaskCard.vue'
 import TaskDetailDrawer from '@/components/TaskDetailDrawer.vue'
 import { useTaskStore } from '@/stores/tasks'
+import type { MoveDirection } from '@/types/task'
 import { computeStats } from '@/utils/stats'
 import { buildTodayBuckets, countTodayTasks } from '@/utils/today'
 
@@ -13,9 +14,26 @@ const WEEKDAYS = ['周日', '周一', '周二', '周三', '周四', '周五', '
 
 /** 用完整类名字符串，避免 Tailwind 扫描不到动态拼接的类 */
 const TONES = {
-  rose: { dot: 'bg-rose-500', badge: 'border-rose-200 bg-rose-50 text-rose-700' },
-  amber: { dot: 'bg-amber-500', badge: 'border-amber-200 bg-amber-50 text-amber-700' },
-  sky: { dot: 'bg-sky-500', badge: 'border-sky-200 bg-sky-50 text-sky-700' },
+  rose: {
+    dot: 'bg-rose-500',
+    badge:
+      'border-rose-200 bg-rose-50 text-rose-700 dark:border-rose-800 dark:bg-rose-950 dark:text-rose-300',
+  },
+  amber: {
+    dot: 'bg-amber-500',
+    badge:
+      'border-amber-200 bg-amber-50 text-amber-700 dark:border-amber-800 dark:bg-amber-950 dark:text-amber-300',
+  },
+  sky: {
+    dot: 'bg-sky-500',
+    badge:
+      'border-sky-200 bg-sky-50 text-sky-700 dark:border-sky-800 dark:bg-sky-950 dark:text-sky-300',
+  },
+  slate: {
+    dot: 'bg-slate-400',
+    badge:
+      'border-slate-200 bg-slate-50 text-slate-600 dark:border-slate-700 dark:bg-slate-800 dark:text-slate-300',
+  },
 } as const
 
 const store = useTaskStore()
@@ -30,10 +48,13 @@ const buckets = computed(() => buildTodayBuckets(tasks.value))
 const stats = computed(() => computeStats(tasks.value))
 const todayCount = computed(() => countTodayTasks(buckets.value))
 
+/**
+ * 统计卡片与下方分组一一对应，避免「数字和列表对不上」的困惑。
+ */
 const statCards = computed(() => [
-  { label: '今日待办', value: todayCount.value, dot: 'bg-slate-400' },
   { label: '逾期', value: stats.value.overdue, dot: 'bg-rose-500' },
   { label: '今天到期', value: stats.value.dueToday, dot: 'bg-amber-500' },
+  { label: '进行中', value: buckets.value.inProgress.length, dot: 'bg-sky-500' },
   { label: '本周完成', value: stats.value.completedThisWeek, dot: 'bg-emerald-500' },
 ])
 
@@ -65,6 +86,13 @@ const sections = computed(() =>
       tone: 'sky' as const,
       items: buckets.value.inProgress,
     },
+    {
+      key: 'pending',
+      title: '待办',
+      hint: '没有紧迫截止时间，有空再做',
+      tone: 'slate' as const,
+      items: buckets.value.pending,
+    },
   ].filter((section) => section.items.length > 0),
 )
 
@@ -76,6 +104,18 @@ function toggleTask(id: string): void {
   if (!task) return
   store.updateTask(id, { status: task.status === 'done' ? 'todo' : 'done' })
 }
+
+/** 今日视图没有列概念，左右方向键不适用；上下仍可调 order */
+function handleKeyMove(payload: { id: string; direction: MoveDirection }): void {
+  if (payload.direction === 'left' || payload.direction === 'right') return
+  const task = store.tasks.find((item) => item.id === payload.id)
+  if (!task) return
+  const column = store.byColumn[task.status]
+  const currentIndex = column.findIndex((item) => item.id === payload.id)
+  const nextIndex = currentIndex + (payload.direction === 'up' ? -1 : 1)
+  if (nextIndex < 0 || nextIndex >= column.length) return
+  store.moveTask(task.id, task.status, nextIndex)
+}
 </script>
 
 <template>
@@ -83,21 +123,23 @@ function toggleTask(id: string): void {
     <!-- 限宽居中：否则 1440px 下卡片会被拉满整屏，标题与元信息之间出现大片空白 -->
     <div class="mx-auto flex w-full max-w-3xl flex-col gap-5 p-4 md:p-6">
       <header class="flex flex-col gap-0.5">
-        <h1 class="text-xl font-semibold tracking-tight text-slate-900 md:text-2xl">今日</h1>
-        <p class="text-sm text-slate-500">{{ todayLabel }}</p>
+        <h1 class="text-xl font-semibold tracking-tight text-slate-900 md:text-2xl dark:text-slate-100">
+          今日
+        </h1>
+        <p class="text-sm text-slate-500 dark:text-slate-400">{{ todayLabel }}</p>
       </header>
 
       <dl class="grid grid-cols-2 gap-3 md:grid-cols-4">
         <div
           v-for="card in statCards"
           :key="card.label"
-          class="rounded-xl border border-slate-200 bg-white px-4 py-3.5 shadow-card"
+          class="rounded-xl border border-slate-200 bg-white px-4 py-3.5 shadow-card dark:border-slate-800 dark:bg-slate-900"
         >
-          <dt class="flex items-center gap-1.5 text-xs text-slate-500">
+          <dt class="flex items-center gap-1.5 text-xs text-slate-500 dark:text-slate-400">
             <span class="size-1.5 rounded-full" :class="card.dot" aria-hidden="true" />
             {{ card.label }}
           </dt>
-          <dd class="mt-1.5 text-2xl font-semibold tracking-tight text-slate-900">
+          <dd class="mt-1.5 text-2xl font-semibold tracking-tight text-slate-900 dark:text-slate-100">
             {{ card.value }}
           </dd>
         </div>
@@ -105,13 +147,15 @@ function toggleTask(id: string): void {
 
       <p
         v-if="todayCount === 0"
-        class="rounded-xl border border-dashed border-slate-300 bg-white/60 px-4 py-16 text-center text-sm text-slate-400"
+        class="rounded-xl border border-dashed border-slate-300 bg-white/60 px-4 py-16 text-center text-sm text-slate-400 dark:border-slate-700 dark:bg-slate-900/40 dark:text-slate-500"
       >
         今天没有待办事项
       </p>
 
       <section v-for="section in sections" :key="section.key" class="flex flex-col gap-2">
-        <h2 class="flex flex-wrap items-center gap-2 text-sm font-medium text-slate-700">
+        <h2
+          class="flex flex-wrap items-center gap-2 text-sm font-medium text-slate-700 dark:text-slate-300"
+        >
           <span class="size-1.5 rounded-full" :class="TONES[section.tone].dot" aria-hidden="true" />
           {{ section.title }}
           <span
@@ -121,7 +165,9 @@ function toggleTask(id: string): void {
           >
             {{ section.items.length }}
           </span>
-          <span class="text-xs font-normal text-slate-400">{{ section.hint }}</span>
+          <span class="text-xs font-normal text-slate-400 dark:text-slate-500">
+            {{ section.hint }}
+          </span>
         </h2>
 
         <div class="flex flex-col gap-2">
@@ -131,6 +177,7 @@ function toggleTask(id: string): void {
             :task="task"
             @toggle="toggleTask"
             @open="editingId = $event"
+            @keymove="handleKeyMove"
           />
         </div>
       </section>