/* roulang page: index */
:root {
      --electric-purple: #A855F7;
      --deep-space: #0F172A;
      --cyber-cyan: #22D3EE;
      --text-soft: #CBD5E1;
      --text-muted: #94A3B8;
      --border-glow: rgba(168, 85, 247, 0.2);
      --card-bg: rgba(15, 23, 42, 0.6);
      --card-shadow: 0 0 30px rgba(168, 85, 247, 0.15);
      --card-hover-shadow: 0 0 50px rgba(168, 85, 247, 0.35);
    }

    * {
      box-sizing: border-box;
    }

    body {
      background-color: var(--deep-space);
      color: var(--text-soft);
      font-family: -apple-system, BlinkMacSystemFont, "PingFang SC", "Microsoft YaHei", sans-serif;
      margin: 0;
      line-height: 1.7;
      overflow-x: hidden;
    }

    .english-number {
      font-family: "Inter", system-ui, -apple-system, sans-serif;
    }

    /* 导航 */
    .navbar {
      background-color: rgba(15, 23, 42, 0.95);
      backdrop-filter: blur(8px);
      border-bottom: 1px solid rgba(168, 85, 247, 0.15);
      position: sticky;
      top: 0;
      z-index: 50;
    }

    .nav-link {
      color: #94A3B8;
      transition: color 0.2s, border-bottom 0.2s;
      border-bottom: 2px solid transparent;
      padding-bottom: 4px;
    }

    .nav-link:hover {
      color: #22D3EE;
      border-bottom-color: #22D3EE;
    }

    .logo-text {
      color: #A855F7;
      font-weight: 800;
      font-size: 1.5rem;
      letter-spacing: -0.02em;
    }

    /* 玻璃拟态卡片 */
    .glass-card {
      background: rgba(15, 23, 42, 0.6);
      backdrop-filter: blur(12px);
      border: 1px solid rgba(168, 85, 247, 0.2);
      border-radius: 16px;
      box-shadow: 0 0 30px rgba(168, 85, 247, 0.15);
      transition: transform 0.3s ease, box-shadow 0.3s ease;
    }

    .glass-card:hover {
      transform: translateY(-4px);
      box-shadow: 0 0 50px rgba(168, 85, 247, 0.35);
    }

    /* 按钮 */
    .btn-primary {
      background-color: #A855F7;
      color: white;
      border-radius: 12px;
      padding: 14px 32px;
      font-weight: 600;
      transition: background-color 0.25s, box-shadow 0.25s;
      border: none;
      cursor: pointer;
      display: inline-block;
      text-align: center;
    }

    .btn-primary:hover {
      background-color: #C084FC;
      box-shadow: 0 0 20px rgba(168, 85, 247, 0.6);
    }

    .btn-outline {
      background: transparent;
      border: 1px solid #22D3EE;
      color: #22D3EE;
      border-radius: 12px;
      padding: 14px 32px;
      font-weight: 600;
      transition: background-color 0.25s, color 0.25s;
      cursor: pointer;
      display: inline-block;
      text-align: center;
    }

    .btn-outline:hover {
      background-color: rgba(34, 211, 238, 0.1);
    }

    /* 表单输入 */
    .input-field {
      background: rgba(15, 23, 42, 0.8);
      border: 1px solid rgba(168, 85, 247, 0.3);
      border-radius: 12px;
      padding: 14px 16px;
      color: white;
      width: 100%;
      transition: border-color 0.25s, box-shadow 0.25s;
      outline: none;
    }

    .input-field::placeholder {
      color: #64748B;
    }

    .input-field:focus {
      border-color: #22D3EE;
      box-shadow: 0 0 15px rgba(34, 211, 238, 0.4);
    }

    /* FAQ 手风琴 */
    .faq-item {
      background: rgba(168, 85, 247, 0.08);
      border-radius: 12px;
      margin-bottom: 8px;
      transition: background 0.3s;
    }

    .faq-item:hover {
      background: rgba(168, 85, 247, 0.15);
    }

    .faq-question {
      padding: 20px 24px;
      cursor: pointer;
      display: flex;
      justify-content: space-between;
      align-items: center;
      font-weight: 600;
      color: #CBD5E1;
    }

    .faq-answer {
      max-height: 0;
      overflow: hidden;
      transition: max-height 0.4s ease, padding 0.4s ease;
      color: #94A3B8;
      padding: 0 24px;
    }

    .faq-item.active .faq-answer {
      max-height: 300px;
      padding: 0 24px 20px;
    }

    .faq-icon {
      font-size: 1.5rem;
      color: #A855F7;
      transition: transform 0.3s;
    }

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

    /* 数据条 */
    .stat-bar {
      background: rgba(168, 85, 247, 0.1);
      border-left: 4px solid #22D3EE;
      padding: 20px 24px;
      border-radius: 12px;
      margin-bottom: 20px;
      display: flex;
      align-items: center;
      justify-content: space-between;
      flex-wrap: wrap;
    }

    .stat-number {
      font-size: 2rem;
      font-weight: 700;
      color: #22D3EE;
    }

    @media (max-width: 768px) {
      .glass-card {
        padding: 24px;
      }
      h1 {
        font-size: 2rem !important;
        line-height: 2.5rem !important;
      }
      h2 {
        font-size: 1.8rem !important;
        line-height: 2.2rem !important;
      }
      .stat-bar {
        flex-direction: column;
        align-items: flex-start;
      }
    }

    .hero-bg {
      background: linear-gradient(180deg, rgba(15,23,42,0.85) 0%, rgba(15,23,42,0.4) 100%), url('/assets/images/backpic/back-1.webp') center/cover no-repeat;
    }

    .footer-divider {
      border-top: 2px solid #A855F7;
    }