/* roulang page: index */
:root {
      --primary: #0B1A2F;
      --accent: #C8A96E;
      --highlight: #00C2D1;
      --bg-light: #F5F7FA;
      --white: #FFFFFF;
      --text-dark: #0B1A2F;
      --text-body: #334155;
      --text-muted: #64748B;
      --text-on-dark: #F1F5F9;
      --card-shadow: 0 4px 20px rgba(0,0,0,0.04);
      --card-hover-shadow: 0 12px 32px rgba(0,0,0,0.08);
      --radius-card: 16px;
      --radius-btn: 50px;
      --transition: 0.3s ease;
      --glass-bg: rgba(255,255,255,0.15);
      --glass-border: rgba(255,255,255,0.2);
    }

    * {
      box-sizing: border-box;
    }

    body {
      font-family: "PingFang SC", "Microsoft YaHei", "Helvetica Neue", system-ui, -apple-system, sans-serif;
      margin: 0;
      background-color: var(--bg-light);
      color: var(--text-body);
      line-height: 1.7;
      -webkit-font-smoothing: antialiased;
    }

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

    /* 导航 */
    .site-header {
      position: sticky;
      top: 0;
      z-index: 50;
      background: var(--white);
      box-shadow: 0 1px 0 rgba(0,0,0,0.06);
      height: 72px;
      display: flex;
      align-items: center;
    }

    .nav-logo {
      display: flex;
      align-items: center;
      gap: 10px;
      text-decoration: none;
      color: var(--text-dark);
    }

    .logo-icon {
      width: 36px;
      height: 36px;
      background: var(--accent);
      clip-path: polygon(50% 0%, 100% 50%, 50% 100%, 0% 50%);
    }

    .logo-text {
      font-size: 20px;
      font-weight: 700;
      letter-spacing: -0.3px;
      color: var(--text-dark);
    }

    .nav-link {
      font-size: 15px;
      font-weight: 500;
      color: #475569;
      text-decoration: none;
      padding: 8px 4px;
      border-bottom: 2px solid transparent;
      transition: color var(--transition), border-color var(--transition);
    }

    .nav-link:hover {
      color: var(--accent);
      border-bottom-color: var(--accent);
    }

    .search-box {
      width: 160px;
      padding: 10px 16px;
      border-radius: 40px;
      border: 1px solid #e2e8f0;
      background: #f8fafc;
      font-size: 14px;
      outline: none;
      transition: border var(--transition);
    }

    .search-box:focus {
      border-color: var(--accent);
    }

    .btn {
      display: inline-flex;
      align-items: center;
      justify-content: center;
      font-weight: 600;
      border-radius: var(--radius-btn);
      transition: all var(--transition);
      text-decoration: none;
      cursor: pointer;
    }

    .btn-primary {
      background: var(--accent);
      color: var(--text-dark);
      padding: 14px 36px;
      border: none;
    }

    .btn-primary:hover {
      background: #D4B87A;
      box-shadow: 0 0 20px rgba(200,169,110,0.5);
      transform: translateY(-2px);
    }

    .btn-outline {
      background: transparent;
      border: 2px solid var(--accent);
      color: var(--accent);
      padding: 14px 36px;
    }

    .btn-outline:hover {
      background: var(--accent);
      color: #0B1A2F;
    }

    .btn-cta {
      background: var(--highlight);
      color: #FFFFFF;
      padding: 14px 36px;
      border: none;
    }

    .btn-cta:hover {
      box-shadow: 0 0 24px rgba(0,194,209,0.6);
      background: #00b3c2;
    }

    .btn-sm {
      padding: 10px 24px;
      font-size: 14px;
    }

    /* 汉堡菜单 */
    .menu-toggle {
      display: none;
      background: none;
      border: none;
      font-size: 24px;
      color: var(--text-dark);
    }

    .mobile-menu {
      display: none;
      position: fixed;
      top: 72px;
      left: 0;
      width: 100%;
      background: white;
      flex-direction: column;
      padding: 24px;
      box-shadow: 0 12px 30px rgba(0,0,0,0.1);
      z-index: 40;
      gap: 16px;
    }

    .mobile-menu a {
      font-size: 18px;
      font-weight: 500;
      color: var(--text-dark);
      text-decoration: none;
      padding: 8px 0;
      border-bottom: 1px solid #f1f5f9;
    }

    /* hero */
    .hero-section {
      background-image: url('/assets/images/backpic/back-1.webp');
      background-size: cover;
      background-position: center;
      min-height: 100vh;
      display: flex;
      align-items: center;
      position: relative;
    }

    .hero-overlay {
      position: absolute;
      inset: 0;
      background: rgba(11,26,47,0.75);
    }

    .glass-card {
      background: rgba(255,255,255,0.15);
      backdrop-filter: blur(20px);
      -webkit-backdrop-filter: blur(20px);
      border: 1px solid rgba(255,255,255,0.2);
      border-radius: 24px;
      padding: 48px;
      max-width: 700px;
      color: white;
    }

    .section-title {
      font-size: 40px;
      font-weight: 700;
      color: var(--text-dark);
      letter-spacing: -0.02em;
    }

    .section-subtitle {
      font-size: 18px;
      color: var(--text-muted);
      margin-top: 12px;
      font-weight: 400;
    }

    .card {
      background: var(--white);
      border-radius: var(--radius-card);
      padding: 32px;
      box-shadow: var(--card-shadow);
      transition: all var(--transition);
    }

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

    .stat-number {
      font-size: 48px;
      font-weight: 800;
      color: var(--accent);
      line-height: 1.2;
    }

    .faq-item {
      border-bottom: 1px solid #e2e8f0;
      padding: 20px 0;
      cursor: pointer;
    }

    .faq-question {
      font-size: 18px;
      font-weight: 600;
      color: var(--text-dark);
      display: flex;
      justify-content: space-between;
      align-items: center;
    }

    .faq-answer {
      max-height: 0;
      overflow: hidden;
      transition: max-height 0.3s ease;
      color: #475569;
      margin-top: 0;
    }

    .faq-item.active .faq-answer {
      max-height: 200px;
      margin-top: 16px;
    }

    .footer-link {
      color: #CBD5E1;
      text-decoration: none;
      transition: color 0.2s;
    }

    .footer-link:hover {
      color: var(--accent);
    }

    @media (max-width: 768px) {
      .desktop-nav {
        display: none;
      }
      .menu-toggle {
        display: block;
      }
      .mobile-menu.show {
        display: flex;
      }
      .section-title {
        font-size: 32px;
      }
      .glass-card {
        padding: 32px;
      }
      .hero-section {
        min-height: 90vh;
      }
      .stat-number {
        font-size: 40px;
      }
      .footer-grid {
        grid-template-columns: 1fr;
      }
    }