/* roulang page: index */
/* 自定义CSS变量与全局重置 */
    :root {
      --primary: #E03E2D;
      --primary-hover: #c5302a;
      --secondary: #1A1A2E;
      --accent: #F5A623;
      --light-bg: #F9FAFB;
      --white: #FFFFFF;
      --text: #1F2937;
      --text-secondary: #4B5563;
      --border: #E5E7EB;
      --radius-lg: 16px;
      --radius-md: 12px;
      --radius-sm: 8px;
      --shadow-card: 0 4px 20px rgba(0,0,0,0.06);
      --shadow-hover: 0 8px 30px rgba(0,0,0,0.12);
      --font-sans: -apple-system, BlinkMacSystemFont, "PingFang SC", "Microsoft YaHei", "Noto Sans SC", "Segoe UI", sans-serif;
      --font-mono: 'Inter', 'SF Mono', 'Fira Code', monospace;
      --transition: all 0.3s ease;
    }

    * {
      box-sizing: border-box;
    }

    body {
      margin: 0;
      font-family: var(--font-sans);
      background-color: var(--light-bg);
      color: var(--text);
      line-height: 1.6;
      -webkit-font-smoothing: antialiased;
    }

    img {
      max-width: 100%;
      height: auto;
      display: block;
    }

    a {
      text-decoration: none;
      color: inherit;
    }

    button, input, textarea {
      font-family: inherit;
    }

    .container {
      max-width: 1280px;
      margin-left: auto;
      margin-right: auto;
      padding-left: 24px;
      padding-right: 24px;
    }

    /* 导航毛玻璃 */
    .nav-blur {
      background: rgba(255,255,255,0.85);
      backdrop-filter: blur(12px);
      -webkit-backdrop-filter: blur(12px);
      border-bottom: 1px solid rgba(0,0,0,0.02);
    }

    .nav-scrolled {
      box-shadow: 0 2px 20px rgba(0,0,0,0.08);
    }

    /* 渐变按钮 */
    .btn-primary {
      background: linear-gradient(90deg, var(--primary) 0%, #f04e3a 100%);
      color: white;
      border-radius: 10px;
      padding: 14px 32px;
      font-weight: 600;
      transition: var(--transition);
      display: inline-block;
      text-align: center;
      border: none;
      cursor: pointer;
      box-shadow: 0 4px 12px rgba(224,62,45,0.3);
    }

    .btn-primary:hover {
      filter: brightness(1.1);
      box-shadow: 0 8px 20px rgba(224,62,45,0.4);
      transform: translateY(-1px);
    }

    .btn-outline {
      background: transparent;
      border: 2px solid var(--primary);
      color: var(--primary);
      border-radius: 10px;
      padding: 14px 32px;
      font-weight: 600;
      transition: var(--transition);
      display: inline-block;
      text-align: center;
      cursor: pointer;
    }

    .btn-outline:hover {
      background: rgba(224,62,45,0.08);
      transform: translateY(-1px);
    }

    /* 卡片系统 */
    .card {
      background: var(--white);
      border-radius: var(--radius-lg);
      box-shadow: var(--shadow-card);
      transition: var(--transition);
      overflow: hidden;
    }

    .card:hover {
      box-shadow: var(--shadow-hover);
      transform: translateY(-4px);
    }

    .metric-badge {
      background: rgba(255,255,255,0.1);
      backdrop-filter: blur(8px);
      border-radius: var(--radius-md);
      padding: 16px;
      display: flex;
      align-items: center;
      gap: 12px;
    }

    /* 数据数字字体 */
    .counter-number {
      font-family: var(--font-mono);
      font-weight: 700;
      font-size: 2rem;
      line-height: 1.2;
    }

    /* 手风琴样式 */
    .faq-item {
      border-bottom: 1px solid var(--border);
      transition: var(--transition);
    }

    .faq-question {
      cursor: pointer;
      padding: 20px 0;
      display: flex;
      justify-content: space-between;
      align-items: center;
      font-weight: 600;
      font-size: 1.1rem;
      transition: var(--transition);
    }

    .faq-question:hover {
      color: var(--primary);
      background-color: #FEF2F2;
      padding-left: 10px;
      border-radius: 8px;
    }

    .faq-answer {
      max-height: 0;
      overflow: hidden;
      transition: max-height 0.4s ease, padding 0.3s ease;
      color: var(--text-secondary);
      line-height: 1.7;
    }

    .faq-item.active .faq-answer {
      max-height: 200px;
      padding-bottom: 16px;
    }

    .faq-item.active .faq-icon {
      transform: rotate(45deg);
    }

    .faq-icon {
      transition: transform 0.3s ease;
      color: var(--primary);
    }

    /* 进度条对比 */
    .progress-bar {
      height: 10px;
      background: #f3f4f6;
      border-radius: 20px;
      overflow: hidden;
      width: 100%;
    }

    .progress-fill {
      height: 100%;
      background: linear-gradient(90deg, var(--primary), var(--accent));
      border-radius: 20px;
      width: 0%;
    }

    /* 移动端菜单 */
    .mobile-menu {
      display: none;
      position: fixed;
      top: 0;
      left: 0;
      width: 100%;
      height: 100vh;
      background: rgba(26,26,46,0.98);
      backdrop-filter: blur(20px);
      z-index: 50;
      flex-direction: column;
      justify-content: center;
      align-items: center;
    }

    .mobile-menu.active {
      display: flex;
    }

    @media (max-width: 768px) {
      .container {
        padding-left: 16px;
        padding-right: 16px;
      }
      h1 {
        font-size: 2.2rem !important;
      }
      h2 {
        font-size: 1.8rem !important;
      }
    }