/* roulang page: index */
:root {
      --primary-deep: #0B0F19;
      --accent-red: #E62E2E;
      --energy-gold: #F5A623;
      --bg-light: #F8FAFC;
      --card-white: #FFFFFF;
      --text-strong: #1E293B;
      --text-body: #475569;
      --text-weak: #94A3B8;
      --border-light: #E2E8F0;
      --radius-card: 12px;
      --shadow-card: 0 4px 24px rgba(0,0,0,0.06);
      --shadow-hover: 0 8px 32px rgba(0,0,0,0.12);
      --transition: 0.25s ease;
      --container-max: 1280px;
    }
    * {
      box-sizing: border-box;
    }
    body {
      font-family: 'PingFang SC', 'Microsoft YaHei', 'Helvetica Neue', sans-serif;
      margin: 0;
      background-color: var(--bg-light);
      color: var(--text-body);
      line-height: 1.6;
      -webkit-font-smoothing: antialiased;
    }
    .container {
      max-width: var(--container-max);
      margin-left: auto;
      margin-right: auto;
      padding-left: 1.5rem;
      padding-right: 1.5rem;
    }
    /* 导航 */
    .navbar {
      background: rgba(11, 15, 25, 0.85);
      backdrop-filter: blur(8px);
      transition: background 0.3s;
      position: fixed;
      top: 0;
      left: 0;
      width: 100%;
      z-index: 50;
      border-bottom: 1px solid rgba(255,255,255,0.08);
    }
    .navbar.scrolled {
      background: rgba(11, 15, 25, 0.98);
    }
    .nav-logo {
      display: flex;
      align-items: center;
      gap: 0.5rem;
      font-weight: 700;
      font-size: 1.5rem;
      color: white;
      letter-spacing: 0.5px;
      text-decoration: none;
    }
    .nav-logo i {
      color: var(--accent-red);
      font-size: 1.8rem;
    }
    .nav-link {
      color: #CBD5E1;
      text-decoration: none;
      font-weight: 500;
      transition: color 0.2s;
      font-size: 0.95rem;
    }
    .nav-link:hover {
      color: white;
    }
    .btn-register-nav {
      background: var(--accent-red);
      color: white;
      border-radius: 8px;
      padding: 0.5rem 1.2rem;
      font-weight: 600;
      transition: all 0.2s;
      box-shadow: 0 0 12px rgba(230,46,46,0.3);
      border: none;
      cursor: pointer;
      display: flex;
      align-items: center;
      gap: 0.3rem;
    }
    .btn-register-nav:hover {
      background: #f04e4e;
      box-shadow: 0 0 18px rgba(230,46,46,0.5);
    }
    .online-badge {
      background: rgba(255,255,255,0.1);
      border-radius: 20px;
      padding: 0.25rem 0.8rem;
      color: #F5A623;
      font-size: 0.8rem;
      font-weight: 600;
    }
    /* 汉堡菜单 */
    .mobile-menu {
      display: none;
      flex-direction: column;
      background: #0B0F19;
      position: absolute;
      top: 100%;
      left: 0;
      width: 100%;
      padding: 1rem 1.5rem;
      border-top: 1px solid rgba(255,255,255,0.1);
    }
    /* 按钮样式 */
    .btn-primary {
      background: var(--accent-red);
      color: white;
      border-radius: 8px;
      padding: 0.75rem 2rem;
      font-weight: 600;
      transition: all 0.25s;
      border: none;
      cursor: pointer;
      display: inline-block;
      text-align: center;
      box-shadow: 0 4px 14px rgba(230,46,46,0.3);
    }
    .btn-primary:hover {
      background: #f04e4e;
      box-shadow: 0 6px 20px rgba(230,46,46,0.5);
      transform: translateY(-1px);
    }
    .btn-outline {
      background: transparent;
      border: 2px solid var(--accent-red);
      color: var(--accent-red);
      border-radius: 8px;
      padding: 0.75rem 2rem;
      font-weight: 600;
      transition: all 0.25s;
      cursor: pointer;
    }
    .btn-outline:hover {
      background: rgba(230,46,46,0.08);
    }
    .section-title {
      font-size: 2.25rem;
      font-weight: 700;
      color: var(--text-strong);
      margin-bottom: 0.5rem;
      letter-spacing: -0.5px;
    }
    .card {
      background: var(--card-white);
      border-radius: var(--radius-card);
      box-shadow: var(--shadow-card);
      transition: var(--transition);
      overflow: hidden;
    }
    .card:hover {
      box-shadow: var(--shadow-hover);
      transform: translateY(-4px);
    }
    .service-card {
      cursor: pointer;
      padding: 2rem 1.5rem;
      text-align: center;
    }
    .service-icon {
      font-size: 2.5rem;
      color: var(--accent-red);
      margin-bottom: 1rem;
    }
    .data-number {
      font-size: 3rem;
      font-weight: 700;
      color: var(--energy-gold);
      line-height: 1.2;
    }
    .faq-item {
      border-bottom: 1px solid var(--border-light);
      padding: 1rem 0;
    }
    .faq-question {
      font-weight: 500;
      font-size: 1.125rem;
      color: var(--text-strong);
      cursor: pointer;
      display: flex;
      justify-content: space-between;
      align-items: center;
    }
    .faq-answer {
      max-height: 0;
      overflow: hidden;
      transition: max-height 0.3s ease;
      color: var(--text-body);
    }
    .footer-link {
      color: #CBD5E1;
      text-decoration: none;
      transition: color 0.2s;
    }
    .footer-link:hover {
      color: var(--accent-red);
    }
    @media (max-width: 768px) {
      .section-title {
        font-size: 1.8rem;
      }
      .desktop-nav {
        display: none;
      }
      .mobile-menu-toggle {
        display: block;
      }
      .hero-title {
        font-size: 2rem !important;
      }
      .grid-cols-3 {
        grid-template-columns: 1fr;
      }
      .grid-cols-2 {
        grid-template-columns: 1fr;
      }
    }
    @media (min-width: 769px) {
      .mobile-menu-toggle {
        display: none;
      }
      .mobile-menu {
        display: none;
      }
    }