铅笔手绘风

你是一个 Sketch Style 设计风格的前端开发专家。生成的所有代码必须严格遵守以下约束：

## 绝对禁止

- 使用完美的直线边框 border-solid（优先使用 border-dashed）
- 使用纯白背景 bg-white
- 使用渐变 bg-gradient-*
- 使用玻璃模糊 backdrop-blur
- 使用完美圆角 rounded-xl, rounded-2xl
- 使用过于饱和的颜色

## 必须遵守

- 纸张色背景 bg-[#f5f0e8]
- 虚线或不规则边框 border-2 border-dashed border-[#2c2c2c]
- 衬线斜体字体 font-serif italic
- 轻微倾斜 rotate-[-0.5deg] 或 rotate-[0.5deg]
- 铅笔灰色主色调 #2c2c2c
- 手绘感阴影 shadow-[3px_3px_0_rgba(44,44,44,0.15)]

## 配色

主色调：
- 铅笔灰: #2c2c2c
- 纸张米色: #f5f0e8

强调色（低饱和度）：
- 红色: #e74c3c
- 蓝色: #3498db
- 绿色: #27ae60
- 黄色: #f39c12

## 特殊效果

纸张纹理：使用 SVG 纹理背景
交叉阴影：线条状半透明阴影
手绘标注：虚线圆圈、波浪下划线
不规则排列：元素微微倾斜

## 自检

每次生成代码后检查：
1. 使用纸张色背景而非纯白
2. 边框为虚线或不规则风格
3. 文字使用衬线斜体
4. 元素有轻微倾斜
5. 整体感觉像手绘素描本

## Animation & Interaction Rules

- Pencil Shading: hover 时可将线框元素快速涂黑并反白文字，模拟铅笔涂抹。
- Stroke Jitter: 交互允许轻微旋转和位移抖动，保留手绘笔触不稳定感。
- Scribble Reveal: 文本强调优先使用虚线/波浪下划线或手绘轨迹样式。
- Paper Press: active 状态应减少阴影并增强倾斜，表现笔尖压纸阻尼感。

## 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

/* Sketch Style 全局样式 */

:root {
  --sketch-dark: #2c2c2c;
  --sketch-paper: #f5f0e8;
  --sketch-red: #e74c3c;
  --sketch-blue: #3498db;
  --sketch-green: #27ae60;
  --sketch-yellow: #f39c12;
}

/* 纸张纹理背景 */
.sketch-paper {
  background-color: var(--sketch-paper);
  background-image: url("data:image/svg+xml,%3Csvg width='6' height='6' viewBox='0 0 6 6' xmlns='http://www.w3.org/2000/svg'%3E%3Cg fill='%232c2c2c' fill-opacity='0.03' fill-rule='evenodd'%3E%3Cpath d='M5 0h1L0 6V5zM6 5v1H5z'/%3E%3C/g%3E%3C/svg%3E");
}

/* 手绘边框效果 */
.sketch-border {
  border: 2px dashed var(--sketch-dark);
  border-radius: 2px;
}

/* 交叉阴影效果 */
.sketch-shadow {
  box-shadow: 3px 3px 0 rgba(44, 44, 44, 0.15);
}

/* 手绘不规则效果 */
.sketch-wobbly {
  transform: rotate(-0.5deg);
}

.sketch-wobbly:nth-child(even) {
  transform: rotate(0.5deg);
}

/* 手写字体 */
.sketch-text {
  font-family: 'Georgia', 'Times New Roman', serif;
  font-style: italic;
}

/* 铅笔下划线 */
.sketch-underline {
  text-decoration: underline;
  text-decoration-style: wavy;
  text-decoration-color: var(--sketch-dark);
  text-underline-offset: 4px;
}

/* 涂鸦圆圈标记 */
.sketch-circle {
  border: 2px solid var(--sketch-dark);
  border-radius: 50%;
  transform: rotate(-2deg);
}
@keyframes sketch-style-fade-in {
  from { opacity: 0; transform: translateY(8px); }
  to { opacity: 1; transform: translateY(0); }
}

@keyframes sketch-style-pulse {
  0%, 100% { opacity: 1; }
  50% { opacity: 0.7; }
}

.sketch-style-card {
  position: relative;
  overflow: hidden;
}

.sketch-style-card::before {
  content: "";
  position: absolute;
  inset: 0;
  opacity: 0;
  transition: opacity 0.3s ease;
  background: linear-gradient(135deg, rgba(44, 44, 44, 0.05), transparent);
  pointer-events: none;
}

.sketch-style-card:hover::before {
  opacity: 1;
}

.sketch-style-gradient {
  background: linear-gradient(135deg, #2c2c2c, #e74c3c);
}

.sketch-style-gradient-text {
  background: linear-gradient(135deg, #2c2c2c, #e74c3c);
  -webkit-background-clip: text;
  -webkit-text-fill-color: transparent;
  background-clip: text;
}

.sketch-style-frosted {
  backdrop-filter: blur(12px) saturate(180%);
  -webkit-backdrop-filter: blur(12px) saturate(180%);
  background: rgba(44, 44, 44, 0.08);
}

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

.sketch-style-animate-in {
  animation: sketch-style-fade-in 0.5s ease-out both;
}

{
  "border": {
    "width": "border-2",
    "color": "border-[#2c2c2c]",
    "radius": "rounded-sm",
    "style": "border-dashed"
  },
  "shadow": {
    "sm": "shadow-[1px_1px_0px_rgba(44,44,44,0.3)]",
    "md": "shadow-[2px_2px_0px_rgba(44,44,44,0.3)]",
    "lg": "shadow-[3px_3px_0px_rgba(44,44,44,0.3)]",
    "none": "shadow-none",
    "hover": "hover:shadow-[2px_2px_0px_rgba(44,44,44,0.5)]",
    "focus": "focus:shadow-[2px_2px_0px_rgba(44,44,44,0.4)]",
    "colored": {
      "pencil": "shadow-[2px_2px_0px_rgba(44,44,44,0.3)]"
    }
  },
  "interaction": {
    "transition": "transition-opacity duration-200",
    "active": "active:opacity-80",
    "hoverOpacity": "hover:opacity-90"
  },
  "typography": {
    "heading": "font-sans font-semibold tracking-normal",
    "body": "font-sans",
    "mono": "font-mono",
    "sizes": {
      "hero": "text-3xl md:text-5xl lg:text-6xl",
      "h1": "text-2xl md:text-4xl",
      "h2": "text-xl md:text-2xl",
      "h3": "text-lg md:text-xl",
      "body": "text-sm md:text-base",
      "small": "text-xs md:text-sm"
    }
  },
  "spacing": {
    "section": "py-10 md:py-16 lg:py-24",
    "container": "px-4 md:px-6 lg:px-10",
    "card": "p-4 md:p-6",
    "gap": {
      "sm": "gap-2 md:gap-3",
      "md": "gap-3 md:gap-5",
      "lg": "gap-5 md:gap-8"
    }
  },
  "colors": {
    "background": {
      "primary": "bg-[#f5f0e8]",
      "secondary": "bg-[#e8e2d8]",
      "accent": [
        "bg-[#2c2c2c]",
        "bg-[#6b6b6b]",
        "bg-[#a0a0a0]"
      ]
    },
    "text": {
      "primary": "text-[#2c2c2c]",
      "secondary": "text-[#5a5a5a]",
      "muted": "text-[#8a8a8a]"
    },
    "button": {
      "primary": "bg-[#2c2c2c] text-[#f5f0e8]",
      "secondary": "bg-transparent text-[#2c2c2c] border-2 border-dashed border-[#2c2c2c]",
      "danger": "bg-[#8b3a3a] text-[#f5f0e8]"
    }
  },
  "forbidden": {
    "classes": [
      "rounded-xl",
      "rounded-2xl",
      "rounded-3xl",
      "rounded-full",
      "shadow-lg",
      "shadow-xl",
      "shadow-2xl",
      "bg-[#ff71ce]",
      "bg-[#01cdfe]",
      "bg-[#ff006e]",
      "bg-[#00ff00]",
      "text-[#ff71ce]",
      "text-[#01cdfe]",
      "text-[#ff006e]",
      "border-4",
      "font-black",
      "bg-gradient-to-r",
      "bg-gradient-to-l"
    ],
    "patterns": [
      "^rounded-(?:xl|2xl|3xl|full)$",
      "^shadow-(?:lg|xl|2xl)$",
      "^bg-(?:\\[#ff|\\[#01cd|\\[#00ff)",
      "^bg-gradient-"
    ],
    "reasons": {
      "rounded-xl": "Sketch style uses minimal rounding (rounded-sm) for a hand-drawn feel",
      "shadow-xl": "Sketch style uses very subtle pencil-like shadows, not heavy shadows",
      "bg-[#ff71ce]": "Sketch style uses pencil tones (grays, cream), not neon colors",
      "bg-gradient-to-r": "Sketch style uses flat paper-like surfaces, not gradients"
    }
  },
  "required": {
    "button": [
      "rounded-sm",
      "border-2 border-dashed border-[#2c2c2c]",
      "transition-opacity duration-200",
      "font-semibold"
    ],
    "card": [
      "rounded-sm",
      "border-2 border-dashed border-[#2c2c2c]",
      "bg-[#f5f0e8]",
      "shadow-[2px_2px_0px_rgba(44,44,44,0.3)]"
    ],
    "input": [
      "rounded-sm",
      "border-2 border-dashed border-[#2c2c2c]",
      "bg-[#faf5ed]",
      "font-sans",
      "focus:shadow-[2px_2px_0px_rgba(44,44,44,0.4)]",
      "focus:outline-none"
    ]
  }
}