:root {
      --primary: #6366f1;
      --primary-light: #818cf8;
      --primary-dark: #4f46e5;
      --secondary: #8b5cf6;
      --accent: #06b6d4;
      --bg-light: #f8fafc;
      --bg-white: #ffffff;
      --bg-card: rgba(255, 255, 255, 0.9);
      --bg-glass: rgba(255, 255, 255, 0.7);
      --text-primary: #1e293b;
      --text-secondary: #64748b;
      --text-muted: #94a3b8;
      --border: rgba(99, 102, 241, 0.15);
      --shadow: 0 25px 50px -12px rgba(99, 102, 241, 0.25);
      --shadow-soft: 0 10px 40px -10px rgba(99, 102, 241, 0.2);
      --glow: 0 0 40px rgba(99, 102, 241, 0.3);
    }
    
    * {
      margin: 0;
      padding: 0;
      box-sizing: border-box;
    }
    
    html {
      scroll-behavior: smooth;
    }
    
    body {
      font-family: 'Inter', -apple-system, BlinkMacSystemFont, sans-serif;
      background: linear-gradient(135deg, #f8fafc 0%, #f1f5f9 50%, #e0e7ff 100%);
      color: var(--text-primary);
      line-height: 1.6;
      overflow-x: hidden;
      min-height: 100vh;
    }
    
    /* 背景动画 */
    .bg-animation {
      position: fixed;
      top: 0;
      left: 0;
      width: 100%;
      height: 100%;
      z-index: -1;
      overflow: hidden;
    }
    
    .bg-animation::before {
      content: '';
      position: absolute;
      top: -50%;
      left: -50%;
      width: 200%;
      height: 200%;
      background: 
        radial-gradient(circle at 20% 80%, rgba(99, 102, 241, 0.12) 0%, transparent 50%),
        radial-gradient(circle at 80% 20%, rgba(139, 92, 246, 0.12) 0%, transparent 50%),
        radial-gradient(circle at 40% 40%, rgba(6, 182, 212, 0.08) 0%, transparent 40%);
      animation: bgFloat 20s ease-in-out infinite;
    }
    
    @keyframes bgFloat {
      0%, 100% { transform: translate(0, 0) rotate(0deg); }
      33% { transform: translate(30px, -30px) rotate(1deg); }
      66% { transform: translate(-20px, 20px) rotate(-1deg); }
    }
    
    /* 网格背景 */
    .grid-bg {
      position: fixed;
      top: 0;
      left: 0;
      width: 100%;
      height: 100%;
      z-index: -1;
      background-image: 
        linear-gradient(rgba(99, 102, 241, 0.04) 1px, transparent 1px),
        linear-gradient(90deg, rgba(99, 102, 241, 0.04) 1px, transparent 1px);
      background-size: 60px 60px;
    }
    
    /* 导航栏 */
    .navbar {
      position: fixed;
      top: 0;
      left: 0;
      right: 0;
      z-index: 1000;
      padding: 1rem 2rem;
      background: rgba(255, 255, 255, 0.85);
      backdrop-filter: blur(20px);
      border-bottom: 1px solid var(--border);
    }
    
    .navbar-inner {
      max-width: 1400px;
      margin: 0 auto;
      display: flex;
      align-items: center;
      justify-content: space-between;
    }
    
    .logo {
      display: flex;
      align-items: center;
      gap: 0.75rem;
      text-decoration: none;
    }
    
    .logo-img {
      width: 40px;
      height: 40px;
      border-radius: 10px;
      -o-object-fit: cover;
         object-fit: cover;
    }
    
    .logo-text {
      font-size: 1.5rem;
      font-weight: 700;
      background: linear-gradient(135deg, var(--primary), var(--accent));
      -webkit-background-clip: text;
      -webkit-text-fill-color: transparent;
      background-clip: text;
    }
    
    .nav-links {
      display: flex;
      gap: 2rem;
    }
    
    .nav-links a {
      color: var(--text-secondary);
      text-decoration: none;
      font-weight: 500;
      font-size: 0.95rem;
      transition: all 0.3s ease;
      position: relative;
    }
    
    .nav-links a::after {
      content: '';
      position: absolute;
      bottom: -4px;
      left: 0;
      width: 0;
      height: 2px;
      background: linear-gradient(90deg, var(--primary), var(--secondary));
      transition: width 0.3s ease;
    }
    
    .nav-links a:hover {
      color: var(--primary);
    }
    
    .nav-links a:hover::after {
      width: 100%;
    }
    
    /* Hero区域 */
    .hero {
      min-height: 100vh;
      display: flex;
      align-items: center;
      justify-content: center;
      padding: 8rem 2rem 4rem;
      position: relative;
    }
    
    .hero-content {
      max-width: 900px;
      text-align: center;
    }
    
    .hero-badge {
      display: inline-flex;
      align-items: center;
      gap: 0.5rem;
      padding: 0.5rem 1rem;
      background: linear-gradient(135deg, rgba(99, 102, 241, 0.1), rgba(139, 92, 246, 0.1));
      border: 1px solid var(--border);
      border-radius: 50px;
      font-size: 0.875rem;
      color: var(--primary);
      margin-bottom: 2rem;
      backdrop-filter: blur(10px);
      font-weight: 500;
    }
    
    .hero-badge::before {
      content: '';
      width: 8px;
      height: 8px;
      background: linear-gradient(135deg, var(--primary), var(--secondary));
      border-radius: 50%;
      animation: pulse 2s infinite;
    }
    
    @keyframes pulse {
      0%, 100% { opacity: 1; }
      50% { opacity: 0.5; }
    }
    
    .hero h1 {
      font-size: clamp(2.5rem, 6vw, 4.5rem);
      font-weight: 800;
      line-height: 1.1;
      margin-bottom: 1.5rem;
      background: linear-gradient(135deg, var(--primary) 0%, var(--secondary) 50%, var(--accent) 100%);
      -webkit-background-clip: text;
      -webkit-text-fill-color: transparent;
      background-clip: text;
    }
    
    .hero p {
      font-size: 1.25rem;
      color: var(--text-secondary);
      max-width: 600px;
      margin: 0 auto 2rem;
    }
    
    .hero-buttons {
      display: flex;
      gap: 1rem;
      justify-content: center;
      flex-wrap: wrap;
    }
    
    .btn {
      padding: 1rem 2rem;
      border-radius: 12px;
      font-weight: 600;
      font-size: 1rem;
      text-decoration: none;
      transition: all 0.3s ease;
      display: inline-flex;
      align-items: center;
      gap: 0.5rem;
    }
    
    .btn-primary {
      background: linear-gradient(135deg, var(--primary), var(--secondary));
      color: white;
      box-shadow: 0 10px 30px rgba(99, 102, 241, 0.4);
    }
    
    .btn-primary:hover {
      transform: translateY(-2px);
      box-shadow: 0 15px 40px rgba(99, 102, 241, 0.5);
    }
    
    .btn-secondary {
      background: var(--bg-white);
      color: var(--text-primary);
      border: 1px solid var(--border);
      backdrop-filter: blur(10px);
    }
    
    .btn-secondary:hover {
      background: linear-gradient(135deg, rgba(99, 102, 241, 0.05), rgba(139, 92, 246, 0.05));
      border-color: var(--primary);
      color: var(--primary);
    }
    
    /* 统计条 */
    .stats-bar {
      display: flex;
      justify-content: center;
      gap: 4rem;
      margin-top: 4rem;
      padding-top: 2rem;
      border-top: 1px solid var(--border);
    }
    
    .stat-item {
      text-align: center;
    }
    
    .stat-number {
      font-size: 2.5rem;
      font-weight: 800;
      background: linear-gradient(135deg, var(--primary), var(--secondary));
      -webkit-background-clip: text;
      -webkit-text-fill-color: transparent;
      background-clip: text;
    }
    
    .stat-label {
      color: var(--text-secondary);
      font-size: 0.875rem;
      margin-top: 0.25rem;
    }
    
    /* 内容区域 */
    .section {
      padding: 6rem 2rem;
      max-width: 1400px;
      margin: 0 auto;
    }
    
    .section-header {
      text-align: center;
      margin-bottom: 4rem;
    }
    
    .section-tag {
      display: inline-block;
      padding: 0.5rem 1rem;
      background: linear-gradient(135deg, rgba(99, 102, 241, 0.1), rgba(139, 92, 246, 0.1));
      border: 1px solid var(--border);
      border-radius: 50px;
      font-size: 0.875rem;
      color: var(--primary);
      margin-bottom: 1rem;
      font-weight: 500;
    }
    
    .section h2 {
      font-size: 2.5rem;
      font-weight: 700;
      margin-bottom: 1rem;
      color: var(--text-primary);
    }
    
    .section h2 span {
      background: linear-gradient(135deg, var(--primary), var(--secondary));
      -webkit-background-clip: text;
      -webkit-text-fill-color: transparent;
      background-clip: text;
    }
    
    .section-desc {
      color: var(--text-secondary);
      font-size: 1.125rem;
      max-width: 600px;
      margin: 0 auto;
    }
    
    /* 生成器区域 */
    .generator-section {
      background: var(--bg-card);
      border: 1px solid var(--border);
      border-radius: 24px;
      padding: 2rem;
      backdrop-filter: blur(20px);
      box-shadow: var(--shadow-soft);
    }
    
    /* 印章类型卡片 */
    .type-cards {
      display: grid;
      grid-template-columns: repeat(auto-fit, minmax(320px, 1fr));
      gap: 1.5rem;
    }
    
    .type-card {
      background: var(--bg-white);
      border: 1px solid var(--border);
      border-radius: 20px;
      padding: 2rem;
      transition: all 0.3s ease;
      position: relative;
      overflow: hidden;
      box-shadow: 0 4px 20px rgba(99, 102, 241, 0.08);
    }
    
    .type-card::before {
      content: '';
      position: absolute;
      top: 0;
      left: 0;
      right: 0;
      height: 3px;
      background: linear-gradient(90deg, var(--primary), var(--secondary));
      opacity: 0;
      transition: opacity 0.3s ease;
    }
    
    .type-card:hover {
      transform: translateY(-5px);
      border-color: rgba(99, 102, 241, 0.3);
      box-shadow: var(--shadow-soft);
    }
    
    .type-card:hover::before {
      opacity: 1;
    }
    
    .type-icon {
      width: 60px;
      height: 60px;
      border-radius: 16px;
      display: flex;
      align-items: center;
      justify-content: center;
      font-size: 1.75rem;
      margin-bottom: 1.5rem;
      background: linear-gradient(135deg, var(--primary), var(--secondary));
      box-shadow: 0 8px 25px rgba(99, 102, 241, 0.3);
    }
    
    .type-card h3 {
      font-size: 1.25rem;
      font-weight: 600;
      margin-bottom: 0.75rem;
      color: var(--text-primary);
    }
    
    .type-card p {
      color: var(--text-secondary);
      font-size: 0.95rem;
      line-height: 1.6;
    }
    
    /* 步骤 */
    .steps {
      display: flex;
      justify-content: center;
      gap: 2rem;
      flex-wrap: wrap;
    }
    
    .step {
      text-align: center;
      flex: 1;
      min-width: 200px;
      max-width: 280px;
    }
    
    .step-icon {
      width: 80px;
      height: 80px;
      border-radius: 24px;
      display: flex;
      align-items: center;
      justify-content: center;
      font-size: 2rem;
      margin: 0 auto 1.5rem;
      background: linear-gradient(135deg, var(--primary), var(--secondary));
      box-shadow: 0 10px 30px rgba(99, 102, 241, 0.3);
      color: #fff;
    }
    
    .step h4 {
      font-size: 1.125rem;
      font-weight: 600;
      margin-bottom: 0.5rem;
      color: var(--text-primary);
    }
    
    .step p {
      color: var(--text-secondary);
      font-size: 0.9rem;
    }
    
    /* 核心优势 */
    .features-grid {
      display: grid;
      grid-template-columns: repeat(auto-fit, minmax(380px, 1fr));
      gap: 1.5rem;
    }
    
    .feature-card {
      background: var(--bg-white);
      border: 1px solid var(--border);
      border-radius: 20px;
      padding: 2rem;
      transition: all 0.3s ease;
      box-shadow: 0 4px 20px rgba(99, 102, 241, 0.06);
    }
    
    .feature-card:hover {
      border-color: rgba(99, 102, 241, 0.3);
      transform: translateY(-3px);
      box-shadow: var(--shadow-soft);
    }
    
    .feature-header {
      display: flex;
      align-items: center;
      gap: 1rem;
      margin-bottom: 1rem;
    }
    
    .feature-icon {
      width: 50px;
      height: 50px;
      border-radius: 14px;
      display: flex;
      align-items: center;
      justify-content: center;
      font-size: 1.5rem;
      flex-shrink: 0;
    }
    
    .feature-icon.free { background: linear-gradient(135deg, #10b981, #059669); }
    .feature-icon.online { background: linear-gradient(135deg, #3b82f6, #2563eb); }
    .feature-icon.transparent { background: linear-gradient(135deg, #8b5cf6, #7c3aed); }
    .feature-icon.types { background: linear-gradient(135deg, #f59e0b, #d97706); }
    .feature-icon.hd { background: linear-gradient(135deg, #ef4444, #dc2626); }
    .feature-icon.easy { background: linear-gradient(135deg, #06b6d4, #0891b2); }
    
    .feature-card h3 {
      font-size: 1.125rem;
      font-weight: 600;
      color: var(--text-primary);
    }
    
    .feature-card p {
      color: var(--text-secondary);
      font-size: 0.9rem;
      line-height: 1.7;
    }
    
    /* 印章展示 */
    .showcase-grid {
      display: grid;
      grid-template-columns: repeat(auto-fit, minmax(280px, 1fr));
      gap: 1.5rem;
    }
    
    .showcase-item {
      background: var(--bg-white);
      border: 1px solid var(--border);
      border-radius: 20px;
      overflow: hidden;
      transition: all 0.3s ease;
      box-shadow: 0 4px 20px rgba(99, 102, 241, 0.06);
    }
    
    .showcase-item:hover {
      transform: translateY(-5px);
      border-color: rgba(99, 102, 241, 0.3);
      box-shadow: var(--shadow-soft);
    }
    
    .showcase-img {
      aspect-ratio: 1/1;
      background: linear-gradient(135deg, rgba(99, 102, 241, 0.08), rgba(139, 92, 246, 0.08));
      display: flex;
      align-items: center;
      justify-content: center;
      position: relative;
      overflow: hidden;
    }
    
    .showcase-img img {
      width: 100%;
      height: 100%;
      -o-object-fit: cover;
         object-fit: cover;
    }
    
    .showcase-img::after {
      position: absolute;
      color: var(--text-secondary);
      font-size: 0.875rem;
    }
    
    .showcase-img img + ::after {
      display: none;
    }
    
    .showcase-content {
      padding: 1.5rem;
    }
    
    .showcase-tag {
      display: inline-block;
      padding: 0.25rem 0.75rem;
      background: linear-gradient(135deg, rgba(99, 102, 241, 0.1), rgba(139, 92, 246, 0.1));
      border-radius: 50px;
      font-size: 0.75rem;
      color: var(--primary);
      margin-bottom: 0.75rem;
      font-weight: 500;
    }
    
    .showcase-item h4 {
      font-size: 1rem;
      font-weight: 600;
      margin-bottom: 0.5rem;
      color: var(--text-primary);
    }
    
    .showcase-item p {
      color: var(--text-secondary);
      font-size: 0.85rem;
    }
    
    /* FAQ */
    .faq-list {
      max-width: 800px;
      margin: 0 auto;
    }
    
    .faq-item {
      background: var(--bg-white);
      border: 1px solid var(--border);
      border-radius: 16px;
      padding: 1.5rem;
      margin-bottom: 1rem;
      transition: all 0.3s ease;
      box-shadow: 0 4px 20px rgba(99, 102, 241, 0.04);
    }
    
    .faq-item:hover {
      border-color: rgba(99, 102, 241, 0.3);
    }
    
    .faq-item h4 {
      color: var(--primary);
      font-size: 1rem;
      font-weight: 600;
      margin-bottom: 0.75rem;
      display: flex;
      align-items: center;
      gap: 0.5rem;
    }
    
    .faq-item h4::before {
      content: 'Q';
      width: 24px;
      height: 24px;
      background: linear-gradient(135deg, var(--primary), var(--secondary));
      border-radius: 6px;
      display: flex;
      align-items: center;
      justify-content: center;
      font-size: 0.75rem;
      color: white;
    }
    
    .faq-item p {
      color: var(--text-secondary);
      font-size: 0.9rem;
      padding-left: 2rem;
    }
    
    /* 关键词 */
    .keywords-cloud {
      display: flex;
      flex-wrap: wrap;
      justify-content: center;
      gap: 0.75rem;
    }
    
    .keyword-tag {
      padding: 0.5rem 1rem;
      background: var(--bg-white);
      border: 1px solid var(--border);
      border-radius: 50px;
      font-size: 0.875rem;
      color: var(--text-secondary);
      transition: all 0.3s ease;
    }
    
    .keyword-tag:hover {
      border-color: var(--primary);
      color: var(--primary);
      background: linear-gradient(135deg, rgba(99, 102, 241, 0.05), rgba(139, 92, 246, 0.05));
    }
    
    /* 页脚 */
    .footer {
      background: linear-gradient(135deg, #1e1b4b 0%, #312e81 100%);
      border-top: 1px solid rgba(99, 102, 241, 0.2);
      padding: 4rem 2rem 2rem;
    }
    
    .footer-inner {
      max-width: 1400px;
      margin: 0 auto;
    }
    
    .footer-top {
      display: grid;
      grid-template-columns: 2fr repeat(3, 1fr);
      gap: 3rem;
      margin-bottom: 3rem;
    }
    
    .footer-brand {
      display: flex;
      align-items: center;
      gap: 0.75rem;
      margin-bottom: 1rem;
    }
    
    .footer-brand img {
      width: 40px;
      height: 40px;
      border-radius: 10px;
      background: linear-gradient(135deg, var(--primary), var(--secondary));
    }
    
    .footer-brand span {
      font-size: 1.25rem;
      font-weight: 700;
      background: linear-gradient(135deg, var(--primary), var(--accent));
      -webkit-background-clip: text;
      -webkit-text-fill-color: transparent;
      background-clip: text;
    }
    
    .footer-desc {
      color: rgba(255, 255, 255, 0.7);
      font-size: 0.9rem;
      line-height: 1.7;
    }
    
    .footer h4 {
      font-size: 1rem;
      font-weight: 600;
      margin-bottom: 1rem;
      color: white;
    }
    
    .footer ul {
      list-style: none;
    }
    
    .footer li {
      margin-bottom: 0.5rem;
    }
    
    .footer a {
      color: rgba(255, 255, 255, 0.7);
      text-decoration: none;
      font-size: 0.9rem;
      transition: color 0.3s ease;
    }
    
    .footer a:hover {
      color: var(--primary-light);
    }
    
    .footer-bottom {
      border-top: 1px solid rgba(255, 255, 255, 0.1);
      padding-top: 2rem;
      text-align: center;
      color: rgba(255, 255, 255, 0.6);
      font-size: 0.875rem;
    }
    
    /* 响应式 */
    @media (max-width: 1024px) {
      .footer-top {
        grid-template-columns: repeat(2, 1fr);
      }
    }
    
    @media (max-width: 768px) {
      .nav-links {
        display: none;
      }
      
      .stats-bar {
        gap: 2rem;
        flex-wrap: wrap;
      }
      
      .features-grid {
        grid-template-columns: 1fr;
      }
      
      .footer-top {
        grid-template-columns: 1fr;
        gap: 2rem;
      }
      
      .section {
        padding: 4rem 1.5rem;
      }
    }