/* roulang page: index */
:root {
      --primary: #FF4D00;
      --primary-dark: #E04300;
      --secondary: #1A1A2E;
      --accent: #00E5FF;
      --bg-light: #F5F5F7;
      --card-bg: #FFFFFF;
      --card-dark: #1A1A2E;
      --text-main: #333333;
      --text-weak: #6b7280;
      --text-on-dark: #e5e7eb;
      --border-light: rgba(0,0,0,0.06);
      --radius-card: 20px;
      --radius-btn: 50px;
      --radius-input: 12px;
      --shadow-sm: 0 4px 12px rgba(0,0,0,0.04);
      --shadow-hover: 0 20px 40px rgba(255, 77, 0, 0.15);
      --font-sans: "Noto Sans SC", "PingFang SC", "Microsoft YaHei", sans-serif;
      --font-number: 'DIN Alternate', 'Noto Sans SC', sans-serif;
    }
    
    /* 全局重置与基础 */
    * {
      margin: 0;
      padding: 0;
      box-sizing: border-box;
    }
    
    html {
      scroll-behavior: smooth;
    }
    
    body {
      font-family: var(--font-sans);
      background-color: var(--bg-light);
      color: var(--text-main);
      line-height: 1.8;
      font-size: 1rem;
      -webkit-font-smoothing: antialiased;
    }
    
    /* 自定义容器，兼顾留白 */
    .container-custom {
      max-width: 1280px;
      margin: 0 auto;
      padding: 0 2rem;
    }
    
    @media (max-width: 768px) {
      .container-custom {
        padding: 0 1.5rem;
      }
    }
    
    /* 按钮样式 */
    .btn-primary {
      background-color: var(--primary);
      color: white;
      border-radius: var(--radius-btn);
      padding: 0.9rem 2.2rem;
      font-weight: 600;
      border: none;
      display: inline-flex;
      align-items: center;
      justify-content: center;
      gap: 0.5rem;
      transition: all 0.3s cubic-bezier(0.25, 0.8, 0.25, 1.2);
      box-shadow: 0 4px 10px rgba(255, 77, 0, 0.2);
      letter-spacing: 0.3px;
    }
    .btn-primary:hover {
      background-color: var(--primary-dark);
      transform: translateY(-2px);
      box-shadow: 0 12px 25px rgba(255, 77, 0, 0.3);
    }
    
    .btn-secondary {
      background: transparent;
      color: var(--primary);
      border: 2px solid var(--primary);
      border-radius: var(--radius-btn);
      padding: 0.9rem 2.2rem;
      font-weight: 600;
      display: inline-flex;
      align-items: center;
      justify-content: center;
      gap: 0.5rem;
      transition: all 0.3s cubic-bezier(0.25, 0.8, 0.25, 1.2);
    }
    .btn-secondary:hover {
      background-color: var(--primary);
      color: white;
      transform: translateY(-2px);
      box-shadow: 0 12px 25px rgba(255, 77, 0, 0.25);
    }
    
    /* 卡片基础 */
    .card {
      background: var(--card-bg);
      border-radius: var(--radius-card);
      box-shadow: var(--shadow-sm);
      transition: all 0.3s ease;
      border: 1px solid var(--border-light);
    }
    .card:hover {
      box-shadow: var(--shadow-hover);
      transform: translateY(-8px);
    }
    
    /* 数据徽章 */
    .badge-accent {
      background-color: var(--accent);
      color: #1A1A2E;
      font-family: var(--font-number);
      font-weight: 700;
      padding: 0.3rem 1rem;
      border-radius: 30px;
      display: inline-block;
      font-size: 1.1rem;
    }
    
    /* 导航毛玻璃效果 */
    .nav-glass {
      background: rgba(26, 26, 46, 0.85);
      backdrop-filter: blur(12px);
      -webkit-backdrop-filter: blur(12px);
    }
    .nav-transparent {
      background: transparent;
    }
    
    /* 渐变背景 */
    .gradient-hero {
      background: linear-gradient(135deg, #FF4D00 0%, #FF8C00 100%);
    }
    
    /* 移动端菜单动画 */
    .mobile-menu-enter {
      opacity: 0;
      transform: translateY(-10px);
    }
    .mobile-menu-active {
      opacity: 1;
      transform: translateY(0);
    }
    
    /* FAQ 细节 */
    details summary {
      list-style: none;
      cursor: pointer;
      display: flex;
      align-items: center;
      justify-content: space-between;
      font-weight: 600;
      padding: 1.2rem 0;
      border-bottom: 1px solid #e5e7eb;
      color: var(--secondary);
      transition: color 0.2s;
    }
    details summary::-webkit-details-marker {
      display: none;
    }
    details summary:hover {
      color: var(--primary);
    }
    details[open] summary {
      color: var(--primary);
    }
    details .faq-content {
      padding: 1rem 0 1.8rem 0;
      color: var(--text-weak);
      line-height: 1.7;
    }