/* roulang page: index */
:root {
      --primary: #1A2B3C;
      --accent: #C49A2B;
      --accent-hover: #A67F22;
      --bg-light: #F8F9FA;
      --white: #FFFFFF;
      --text-main: #333333;
      --text-title: #1A2B3C;
      --text-muted: #6B7280;
      --border-light: #E5E7EB;
      --radius-card: 12px;
      --radius-btn: 8px;
      --shadow-sm: 0 4px 12px rgba(0,0,0,0.06);
      --shadow-md: 0 12px 24px rgba(0,0,0,0.1);
      --transition: 0.3s ease;
    }
    * {
      box-sizing: border-box;
    }
    body {
      margin: 0;
      font-family: -apple-system, BlinkMacSystemFont, "PingFang SC", "Microsoft YaHei", "Helvetica Neue", sans-serif;
      background-color: var(--bg-light);
      color: var(--text-main);
      line-height: 1.6;
      -webkit-font-smoothing: antialiased;
    }
    .container {
      max-width: 1280px;
      margin-left: auto;
      margin-right: auto;
      padding-left: 24px;
      padding-right: 24px;
    }
    /* 导航吸顶效果 */
    .navbar {
      position: sticky;
      top: 0;
      z-index: 50;
      background-color: var(--white);
      box-shadow: 0 2px 10px rgba(0,0,0,0.04);
      transition: var(--transition);
    }
    .nav-brand {
      font-weight: 700;
      font-size: 1.6rem;
      color: var(--primary);
      display: flex;
      align-items: center;
      gap: 8px;
      text-decoration: none;
    }
    .nav-brand i {
      color: var(--accent);
      font-size: 1.8rem;
    }
    .nav-link {
      color: var(--text-title);
      font-weight: 500;
      padding: 0.5rem 0.75rem;
      transition: color 0.2s;
      text-decoration: none;
      position: relative;
    }
    .nav-link:hover,
    .nav-link.active {
      color: var(--accent);
    }
    .nav-link.active::after {
      content: '';
      position: absolute;
      bottom: -4px;
      left: 0.75rem;
      right: 0.75rem;
      height: 3px;
      background-color: var(--accent);
      border-radius: 2px;
    }
    .btn-primary {
      background-color: var(--accent);
      color: #FFFFFF;
      border-radius: var(--radius-btn);
      padding: 0.75rem 2rem;
      font-weight: 600;
      display: inline-block;
      text-align: center;
      transition: background-color 0.2s, transform 0.2s;
      border: none;
      cursor: pointer;
      text-decoration: none;
    }
    .btn-primary:hover {
      background-color: var(--accent-hover);
      transform: translateY(-2px);
    }
    .btn-outline {
      border: 2px solid var(--primary);
      color: var(--primary);
      background: transparent;
      border-radius: var(--radius-btn);
      padding: 0.75rem 2rem;
      font-weight: 600;
      display: inline-block;
      text-align: center;
      transition: all 0.2s;
      cursor: pointer;
      text-decoration: none;
    }
    .btn-outline:hover {
      background-color: var(--primary);
      color: #FFFFFF;
      transform: translateY(-2px);
    }
    .card {
      background: var(--white);
      border-radius: var(--radius-card);
      box-shadow: var(--shadow-sm);
      padding: 32px;
      transition: transform var(--transition), box-shadow var(--transition);
    }
    .card:hover {
      transform: translateY(-4px);
      box-shadow: var(--shadow-md);
    }
    .section-padding {
      padding-top: 80px;
      padding-bottom: 80px;
    }
    @media (max-width: 768px) {
      .section-padding {
        padding-top: 48px;
        padding-bottom: 48px;
      }
      .container {
        padding-left: 20px;
        padding-right: 20px;
      }
    }
    /* 汉堡菜单 */
    .mobile-menu {
      display: none;
      flex-direction: column;
      background: white;
      position: absolute;
      top: 100%;
      right: 0;
      width: 70%;
      max-width: 320px;
      box-shadow: 0 10px 20px rgba(0,0,0,0.1);
      padding: 1.5rem;
      border-radius: 0 0 12px 12px;
    }
    #menu-toggle:checked ~ .mobile-menu {
      display: flex;
    }
    .faq-answer {
      max-height: 0;
      overflow: hidden;
      transition: max-height 0.4s ease, padding 0.3s;
      background: #FFFFFF;
      border-bottom: 1px solid var(--border-light);
    }
    .faq-item.active .faq-answer {
      max-height: 200px;
      padding: 16px 0;
    }
    .faq-item.active .faq-icon {
      transform: rotate(45deg);
    }
    .testimonial-card {
      background: #F8F9FA;
      border-left: 4px solid var(--accent);
      border-radius: 12px;
    }
    .stat-number {
      font-size: 48px;
      font-weight: 700;
      color: var(--accent);
      line-height: 1.2;
    }
    h1 { font-size: 48px; line-height: 1.25; font-weight: 700; }
    h2 { font-size: 36px; line-height: 1.3; font-weight: 700; }
    @media (max-width: 768px) {
      h1 { font-size: 32px; }
      h2 { font-size: 28px; }
      .stat-number { font-size: 36px; }
    }