<!-- 移动优先的写法 -->
<div class="text-sm md:text-base lg:text-lg">文字大小随屏幕增大</div>

// 移动优先：从简单到复杂
function ProductGrid({ products }: { products: Product[] }) {
  return (
    <div
      className="
      grid
      grid-cols-1      /* 手机：1列 */
      sm:grid-cols-2   /* 小平板：2列 */
      lg:grid-cols-3   /* 桌面：3列 */
      xl:grid-cols-4   /* 大屏：4列 */
      gap-4
      sm:gap-6
      lg:gap-8
    "
    >
      {products.map((product) => (
        <ProductCard key={product.id} product={product} />
      ))}
    </div>
  )
}

<!-- 显示/隐藏 -->
<div class="hidden md:block">平板及以上显示</div>
<div class="md:hidden">仅手机显示</div>

<!-- 布局切换 -->
<div class="flex flex-col md:flex-row">手机垂直排列，平板水平排列</div>

<!-- 间距调整 -->
<section class="py-8 md:py-12 lg:py-16">响应式内边距</section>

<!-- 网格列数 -->
<div class="grid grid-cols-2 md:grid-cols-3 lg:grid-cols-4">响应式网格</div>

<!-- max-* 最大宽度断点 -->
<div class="max-md:text-center">仅在 md 断点以下居中</div>

<!-- 范围断点 -->
<div class="md:max-lg:bg-blue-500">仅在 md 到 lg 之间显示蓝色背景</div>

@import 'tailwindcss';

@theme {
  --breakpoint-xs: 475px;
  --breakpoint-3xl: 1920px;
}

<div class="xs:text-sm 3xl:text-xl">使用自定义断点</div>

<h1 class="text-2xl sm:text-3xl md:text-4xl lg:text-5xl font-bold">
  响应式标题
</h1>

<p class="text-sm sm:text-base lg:text-lg leading-relaxed">响应式正文</p>

const headingStyles = {
  h1: 'text-3xl sm:text-4xl lg:text-5xl xl:text-6xl',
  h2: 'text-2xl sm:text-3xl lg:text-4xl',
  h3: 'text-xl sm:text-2xl lg:text-3xl',
  h4: 'text-lg sm:text-xl lg:text-2xl',
}

<!-- 容器内边距 -->
<div class="px-4 sm:px-6 lg:px-8">内容区域</div>

<!-- 区块间距 -->
<section class="py-12 sm:py-16 lg:py-20 xl:py-24">大区块</section>

<!-- 元素间隙 -->
<div class="space-y-4 sm:space-y-6 lg:space-y-8">堆叠元素</div>

function Feature({ icon, title, description }: FeatureProps) {
  return (
    <div
      className="
      flex
      flex-col          /* 手机：垂直堆叠 */
      sm:flex-row       /* 平板：水平排列 */
      items-start
      sm:items-center
      gap-4
    "
    >
      <div className="shrink-0 size-12 rounded-lg bg-blue-100 flex items-center justify-center">
        {icon}
      </div>
      <div>
        <h3 className="font-bold text-lg">{title}</h3>
        <p className="text-gray-600 mt-1">{description}</p>
      </div>
    </div>
  )
}

function Dashboard() {
  return (
    <div className="grid grid-cols-1 md:grid-cols-2 xl:grid-cols-4 gap-4 lg:gap-6">
      {/* 指标卡片 */}
      <StatsCard title="总用户" value="12,345" />
      <StatsCard title="活跃用户" value="8,901" />
      <StatsCard title="收入" value="¥234,567" />
      <StatsCard title="订单" value="1,234" />

      {/* 跨列图表 */}
      <div className="md:col-span-2 xl:col-span-2">
        <Chart type="line" />
      </div>
      <div className="md:col-span-2 xl:col-span-2">
        <Chart type="bar" />
      </div>

      {/* 全宽表格 */}
      <div className="md:col-span-2 xl:col-span-4">
        <DataTable />
      </div>
    </div>
  )
}

<!-- 定义查询容器 -->
<div class="@container">
  <!-- 根据容器宽度响应 -->
  <div class="@sm:flex @lg:grid @lg:grid-cols-2">容器查询布局</div>
</div>

function ArticleCard({ article }: { article: Article }) {
  return (
    // 容器
    <article className="@container bg-white rounded-xl shadow-sm overflow-hidden">
      <div
        className="
        flex
        flex-col           /* 默认：垂直布局 */
        @md:flex-row       /* 容器 ≥448px：水平布局 */
      "
      >
        {/* 图片 */}
        <div
          className="
          aspect-video       /* 默认：16:9 */
          @md:aspect-square  /* 水平布局时：正方形 */
          @md:w-48           /* 固定宽度 */
          shrink-0
        "
        >
          <img
            src={article.image}
            alt={article.title}
            className="w-full h-full object-cover"
          />
        </div>

        {/* 内容 */}
        <div className="p-4 @lg:p-6">
          <h3
            className="
            text-lg
            @lg:text-xl
            font-bold
          "
          >
            {article.title}
          </h3>
          <p
            className="
            mt-2
            text-sm
            @lg:text-base
            text-gray-600
            line-clamp-2
            @md:line-clamp-3
          "
          >
            {article.excerpt}
          </p>
        </div>
      </div>
    </article>
  )
}

<div class="@container/main">
  <div class="@container/sidebar">
    <!-- 查询 sidebar 容器 -->
    <div class="@md/sidebar:hidden">...</div>

    <!-- 查询 main 容器 -->
    <div class="@lg/main:grid-cols-2">...</div>
  </div>
</div>

<!-- 基础响应式图片 -->
<img src="/image.jpg" alt="描述" class="w-full max-w-md mx-auto" />

<!-- 不同尺寸的图片 -->
<img
  src="/image.jpg"
  alt="描述"
  class="
    w-full
    md:w-1/2
    lg:w-1/3
  "
/>

<!-- 固定宽高比 -->
<div class="aspect-video">
  <img src="/image.jpg" alt="描述" class="w-full h-full object-cover" />
</div>

<!-- 手机 1:1，平板 4:3，桌面 16:9 -->
<div class="aspect-square md:aspect-[4/3] lg:aspect-video">
  <img src="/image.jpg" alt="描述" class="w-full h-full object-cover" />
</div>

<div
  class="
  bg-cover bg-center
  h-[300px]
  md:h-[400px]
  lg:h-[500px]
  bg-[url('/hero-mobile.jpg')]
  md:bg-[url('/hero-tablet.jpg')]
  lg:bg-[url('/hero-desktop.jpg')]
"
>
  响应式背景
</div>

function VideoEmbed({ src }: { src: string }) {
  return (
    <div className="aspect-video w-full max-w-4xl mx-auto">
      <iframe src={src} className="w-full h-full" allowFullScreen />
    </div>
  )
}

import { useState } from 'react'

function Navbar() {
  const [isOpen, setIsOpen] = useState(false)

  const navLinks = [
    { href: '/', label: '首页' },
    { href: '/products', label: '产品' },
    { href: '/about', label: '关于' },
    { href: '/contact', label: '联系' },
  ]

  return (
    <nav className="bg-white border-b border-gray-200">
      <div className="max-w-7xl mx-auto px-4 sm:px-6 lg:px-8">
        <div className="flex items-center justify-between h-16">
          {/* Logo */}
          <div className="shrink-0">
            <a href="/" className="text-xl font-bold text-gray-900">
              Logo
            </a>
          </div>

          {/* 桌面导航 */}
          <div className="hidden md:flex md:items-center md:gap-8">
            {navLinks.map((link) => (
              <a
                key={link.href}
                href={link.href}
                className="text-gray-600 hover:text-gray-900 transition-colors"
              >
                {link.label}
              </a>
            ))}
            <button className="px-4 py-2 bg-blue-500 text-white rounded-lg hover:bg-blue-600 transition-colors">
              登录
            </button>
          </div>

          {/* 移动端菜单按钮 */}
          <button
            className="md:hidden p-2 rounded-lg hover:bg-gray-100"
            onClick={() => setIsOpen(!isOpen)}
          >
            <svg
              className="size-6"
              fill="none"
              stroke="currentColor"
              viewBox="0 0 24 24"
            >
              {isOpen ? (
                <path
                  strokeLinecap="round"
                  strokeLinejoin="round"
                  strokeWidth={2}
                  d="M6 18L18 6M6 6l12 12"
                />
              ) : (
                <path
                  strokeLinecap="round"
                  strokeLinejoin="round"
                  strokeWidth={2}
                  d="M4 6h16M4 12h16M4 18h16"
                />
              )}
            </svg>
          </button>
        </div>

        {/* 移动端菜单 */}
        <div className={`md:hidden ${isOpen ? 'block' : 'hidden'}`}>
          <div className="py-4 space-y-2">
            {navLinks.map((link) => (
              <a
                key={link.href}
                href={link.href}
                className="block py-2 px-4 text-gray-600 hover:text-gray-900 hover:bg-gray-50 rounded-lg"
              >
                {link.label}
              </a>
            ))}
            <div className="pt-4 border-t border-gray-100">
              <button className="w-full py-2 bg-blue-500 text-white rounded-lg hover:bg-blue-600">
                登录
              </button>
            </div>
          </div>
        </div>
      </div>
    </nav>
  )
}

function Layout({ children }: { children: React.ReactNode }) {
  const [sidebarOpen, setSidebarOpen] = useState(false)

  return (
    <div className="min-h-screen">
      {/* 移动端遮罩 */}
      {sidebarOpen && (
        <div
          className="fixed inset-0 bg-black/50 z-40 lg:hidden"
          onClick={() => setSidebarOpen(false)}
        />
      )}

      {/* 侧边栏 */}
      <aside
        className={`
        fixed top-0 left-0 z-50
        w-64 h-full
        bg-white border-r border-gray-200
        transform transition-transform duration-300
        ${sidebarOpen ? 'translate-x-0' : '-translate-x-full'}
        lg:translate-x-0 lg:static lg:z-0
      `}
      >
        <div className="p-4">
          <h2 className="text-lg font-bold">侧边栏</h2>
          {/* 导航项 */}
        </div>
      </aside>

      {/* 主内容区 */}
      <main className="lg:ml-64">
        {/* 顶栏 */}
        <header className="h-16 border-b border-gray-200 flex items-center px-4 lg:px-8">
          <button
            className="lg:hidden p-2 rounded-lg hover:bg-gray-100"
            onClick={() => setSidebarOpen(true)}
          >
            <svg
              className="size-6"
              fill="none"
              stroke="currentColor"
              viewBox="0 0 24 24"
            >
              <path
                strokeLinecap="round"
                strokeLinejoin="round"
                strokeWidth={2}
                d="M4 6h16M4 12h16M4 18h16"
              />
            </svg>
          </button>
          <h1 className="ml-4 lg:ml-0 text-xl font-bold">页面标题</h1>
        </header>

        {/* 内容 */}
        <div className="p-4 lg:p-8">{children}</div>
      </main>
    </div>
  )
}

function BreakpointIndicator() {
  if (process.env.NODE_ENV === 'production') return null

  return (
    <div className="fixed bottom-4 left-4 z-50 px-3 py-1 bg-gray-900 text-white text-sm font-mono rounded">
      <span className="sm:hidden">xs</span>
      <span className="hidden sm:inline md:hidden">sm</span>
      <span className="hidden md:inline lg:hidden">md</span>
      <span className="hidden lg:inline xl:hidden">lg</span>
      <span className="hidden xl:inline 2xl:hidden">xl</span>
      <span className="hidden 2xl:inline">2xl</span>
    </div>
  )
}