F型布局

你是一个 F-Pattern Layout 布局专家。生成的所有代码必须严格遵守以下约束：

## 布局规则

- 页面顶部放置最重要的信息（logo、导航、特色内容）
- 第二行放置次重要的信息（分类、搜索）
- 左侧放置主内容区（文章列表）
- 右侧放置辅助内容（侧边栏）
- 所有文字左对齐 text-left

## 内容层级

第一层（顶部全宽）：
- 导航栏
- 特色文章/头条

第二层（次要水平区）：
- 分类标签
- 搜索栏

第三层（左侧垂直列表）：
- 文章列表
- 带缩略图的内容卡片

辅助区（右侧）：
- 热门推荐
- 标签云
- 广告位

## 响应式

桌面端：左主内容 + 右侧边栏
平板端：全宽主内容 + 折叠侧边栏
手机端：单列堆叠

## 自检

1. 最重要的内容在顶部和左上
2. 有清晰的标题层级
3. 文字左对齐
4. 内容可快速扫描
5. 响应式适配完善

## Animation & Interaction Rules

- Eye-Tracking Guides: 列表项 hover 时，主标题可轻微右移（如 `translate-x-1`）或下划线浮现，帮助扫描阶段快速锁定。
- Fast Feedback: 资讯类交互建议 `duration-150` 到 `duration-200`，避免冗长过渡打断阅读。
- Contrast Pop: 当前 hover 项可通过轻微阴影或边框对比强化，从信息流中短暂剥离。
- Image Focus: 缩略图 hover 时可提升对比度或亮度，作为可点击反馈，但幅度必须克制。

## Layout & Spacing
- Section padding: py-16 md:py-24
- Card padding: p-6 md:p-8
- Gap between cards: gap-6 md:gap-8
- Max content width: max-w-6xl mx-auto

## Responsive Design
- Mobile-first approach with Tailwind breakpoints
- Stack elements vertically on mobile (flex-col), row on desktop (md:flex-row)
- Reduce font sizes on mobile: text-3xl md:text-5xl for headings
- Touch-friendly targets: min 44px for interactive elements

## Self-Check Verification
After generating code, verify:
1. All interactive elements have hover/focus/active states
2. Color contrast meets WCAG 2.1 AA (4.5:1 for text)
3. Layout is responsive across breakpoints
4. Typography hierarchy is clear (h1 > h2 > h3 > body)
5. Spacing is consistent using the defined scale
6. All animations respect prefers-reduced-motion

/* F-Pattern Layout 全局样式 */

/* F型布局容器 */
.f-layout {
  max-width: 1200px;
  margin: 0 auto;
  padding: 0 1.5rem;
}

/* 顶部扫描区（F的第一笔） */
.f-top-bar {
  width: 100%;
  padding: 2rem 0;
  border: 1px solid #e5e7eb;
}

/* 第二扫描区（F的第二笔，较短） */
.f-secondary {
  width: 75%;
  padding: 1.5rem 0;
}

/* 垂直扫描区（F的竖线） */
.f-vertical {
  display: flex;
  gap: 2rem;
}

.f-vertical-main {
  flex: 1;
}

.f-vertical-aside {
  width: 250px;
  flex-shrink: 0;
}

/* 内容优先级 */
.f-priority-high {
  font-size: 1.5rem;
  font-weight: 700;
  color: #1a1a2e;
}

.f-priority-medium {
  font-size: 1.125rem;
  font-weight: 600;
  color: #374151;
}

.f-priority-low {
  font-size: 0.875rem;
  color: #6b7280;
}

/* 响应式 */
@media (max-width: 768px) {
  .f-vertical {
    flex-direction: column;
  }
  .f-vertical-aside {
    width: 100%;
  }
  .f-secondary {
    width: 100%;
  }
}
/* F-Pattern Layout Design Tokens */
:root {
  --f-pattern-layout-primary: #1a1a2e;
  --f-pattern-layout-secondary: #f8f9fa;
  --f-pattern-layout-accent: #e63946;
  --f-pattern-layout-glow: rgba(26, 26, 46, 0.3);
}

@keyframes f-pattern-layout-fade-in {
  from { opacity: 0; transform: translateY(8px); }
  to { opacity: 1; transform: translateY(0); }
}

@keyframes f-pattern-layout-pulse {
  0%, 100% { opacity: 1; }
  50% { opacity: 0.7; }
}

.f-pattern-layout-card {
  position: relative;
  overflow: hidden;
}

.f-pattern-layout-card::before {
  content: "";
  position: absolute;
  inset: 0;
  opacity: 0;
  transition: opacity 0.3s ease;
  background: linear-gradient(135deg, rgba(26, 26, 46, 0.05), transparent);
  pointer-events: none;
}

.f-pattern-layout-card:hover::before {
  opacity: 1;
}

.f-pattern-layout-gradient {
  background: linear-gradient(135deg, #1a1a2e, #e63946);
}

.f-pattern-layout-gradient-text {
  background: linear-gradient(135deg, #1a1a2e, #e63946);
  -webkit-background-clip: text;
  -webkit-text-fill-color: transparent;
  background-clip: text;
}

.f-pattern-layout-frosted {
  backdrop-filter: blur(12px) saturate(180%);
  -webkit-backdrop-filter: blur(12px) saturate(180%);
  background: rgba(26, 26, 46, 0.08);
}

.f-pattern-layout-accent-corner {
  clip-path: polygon(0 0, 100% 0, 100% calc(100% - 2rem), calc(100% - 2rem) 100%, 0 100%);
}

.f-pattern-layout-animate-in {
  animation: f-pattern-layout-fade-in 0.5s ease-out both;
}

{
  "border": {
    "width": "border",
    "color": "border-gray-200",
    "radius": "rounded-lg",
    "style": "border-solid"
  },
  "shadow": {
    "sm": "shadow-sm",
    "md": "shadow-sm",
    "lg": "shadow-md",
    "none": "shadow-none",
    "hover": "hover:shadow-md",
    "focus": "focus:shadow-sm",
    "colored": {}
  },
  "interaction": {
    "transition": "transition-colors duration-200",
    "active": "active:scale-95",
    "hoverOpacity": "hover:opacity-90"
  },
  "typography": {
    "heading": "font-semibold tracking-tight",
    "body": "font-sans",
    "mono": "font-mono",
    "sizes": {
      "hero": "text-3xl md:text-4xl",
      "h1": "text-2xl md:text-3xl",
      "h2": "text-xl md:text-2xl",
      "h3": "text-lg md:text-xl",
      "body": "text-sm md:text-base",
      "small": "text-xs"
    }
  },
  "spacing": {
    "section": "py-6 md:py-8 lg:py-12",
    "container": "px-4 md:px-6",
    "card": "p-4 md:p-6",
    "gap": {
      "sm": "gap-3 md:gap-4",
      "md": "gap-4 md:gap-6",
      "lg": "gap-6 md:gap-8"
    }
  },
  "colors": {
    "background": {
      "primary": "bg-[#f8f9fa]",
      "secondary": "bg-white",
      "accent": [
        "bg-[#e63946]",
        "bg-[#457b9d]",
        "bg-[#2a9d8f]",
        "bg-[#e9c46a]"
      ]
    },
    "text": {
      "primary": "text-[#1a1a2e]",
      "secondary": "text-gray-600",
      "muted": "text-gray-400"
    },
    "button": {
      "primary": "bg-[#e63946] text-white",
      "secondary": "bg-gray-100 text-gray-700"
    }
  },
  "forbidden": {
    "classes": [
      "text-center",
      "rounded-none",
      "rounded-2xl",
      "rounded-3xl",
      "shadow-2xl",
      "font-black"
    ],
    "patterns": [
      "^rounded-(?:none|2xl|3xl)",
      "^shadow-2xl"
    ],
    "reasons": {
      "text-center": "F-Pattern Layout uses left-aligned text to follow natural scanning patterns",
      "rounded-none": "F-Pattern Layout uses moderate rounding for professional appearance",
      "shadow-2xl": "F-Pattern Layout uses subtle shadows for clean readability"
    }
  },
  "required": {
    "button": [
      "rounded-lg",
      "font-medium",
      "transition-colors"
    ],
    "card": [
      "bg-white",
      "rounded-lg",
      "shadow-sm",
      "text-left"
    ],
    "input": [
      "bg-gray-50",
      "border border-gray-200",
      "rounded-lg",
      "focus:outline-none",
      "focus:ring-2 focus:ring-[#457b9d]/20 focus:border-[#457b9d]",
      "transition-all"
    ]
  }
}