/* roulang page: index */
:root {
      --bg-deep: #0A0F1A;
      --bg-glass: rgba(255,255,255,0.05);
      --bg-light: #F5F6FA;
      --primary-blue: #0A1A3F;
      --accent-cyan: #00D4FF;
      --accent-blue: #0077FF;
      --text-white: #FFFFFF;
      --text-white-muted: rgba(255,255,255,0.7);
      --text-dark: #1F2329;
      --text-gray: #86909C;
      --card-radius: 16px;
      --card-radius-light: 12px;
      --btn-radius: 50px;
      --glow-cyan: 0 0 20px rgba(0,212,255,0.4);
      --transition-smooth: all 0.3s cubic-bezier(0.4, 0, 0.2, 1);
      --safe-bottom: env(safe-area-inset-bottom);
    }
    * {
      box-sizing: border-box;
    }
    body {
      margin: 0;
      font-family: -apple-system, BlinkMacSystemFont, "PingFang SC", "Helvetica Neue", "Microsoft YaHei", sans-serif;
      line-height: 1.5;
      background-color: var(--bg-deep);
      color: var(--text-white);
      -webkit-font-smoothing: antialiased;
    }
    .container {
      max-width: 1200px;
      margin-left: auto;
      margin-right: auto;
      padding-left: 24px;
      padding-right: 24px;
    }
    @media (max-width: 768px) {
      .container {
        padding-left: 16px;
        padding-right: 16px;
      }
    }
    /* 导航栏 */
    .nav-glass {
      background: rgba(10,15,26,0.85);
      backdrop-filter: blur(16px);
      -webkit-backdrop-filter: blur(16px);
      border-bottom: 1px solid rgba(255,255,255,0.08);
      transition: background 0.3s ease;
    }
    .nav-scrolled {
      background: rgba(10,15,26,0.95);
    }
    .nav-link {
      color: var(--text-white-muted);
      font-weight: 500;
      position: relative;
      padding: 0.5rem 0;
      transition: color 0.2s;
    }
    .nav-link:hover, .nav-link.active {
      color: var(--accent-cyan);
    }
    .mobile-menu {
      background: rgba(10,15,26,0.96);
      backdrop-filter: blur(24px);
      -webkit-backdrop-filter: blur(24px);
    }
    /* 发光按钮 */
    .btn-glow {
      background: linear-gradient(135deg, #00D4FF, #0077FF);
      color: #FFFFFF;
      font-weight: 600;
      border-radius: 50px;
      padding: 0.8rem 2rem;
      box-shadow: 0 0 20px rgba(0,212,255,0.4), 0 4px 16px rgba(0,119,255,0.3);
      transition: all 0.25s ease;
      display: inline-block;
      text-align: center;
      border: none;
      cursor: pointer;
    }
    .btn-glow:hover {
      transform: translateY(-2px);
      box-shadow: 0 0 28px rgba(0,212,255,0.55), 0 6px 22px rgba(0,119,255,0.4);
    }
    .btn-outline {
      background: rgba(255,255,255,0.1);
      border: 1px solid rgba(255,255,255,0.2);
      color: #FFFFFF;
      font-weight: 500;
      border-radius: 50px;
      padding: 0.8rem 2rem;
      transition: all 0.3s ease;
      display: inline-block;
      text-align: center;
    }
    .btn-outline:hover {
      background: rgba(255,255,255,0.15);
      border-color: rgba(0,212,255,0.4);
    }
    /* 玻璃卡片 */
    .glass-card {
      background: rgba(255,255,255,0.05);
      border: 1px solid rgba(255,255,255,0.1);
      border-radius: 16px;
      backdrop-filter: blur(20px);
      -webkit-backdrop-filter: blur(20px);
      box-shadow: 0 8px 32px rgba(0,0,0,0.4);
      transition: all 0.3s cubic-bezier(0.4, 0, 0.2, 1);
      padding: 2rem;
      display: flex;
      flex-direction: column;
      align-items: center;
      text-align: center;
    }
    .glass-card:hover {
      background: rgba(255,255,255,0.08);
      border-color: rgba(0,212,255,0.3);
      transform: translateY(-4px);
      box-shadow: 0 12px 40px rgba(0,0,0,0.5);
    }
    .light-card {
      background: #FFFFFF;
      border-radius: 12px;
      box-shadow: 0 2px 12px rgba(0,0,0,0.06);
      padding: 2rem;
    }
    .section-gap {
      padding-top: 100px;
      padding-bottom: 100px;
    }
    @media (max-width: 768px) {
      .section-gap {
        padding-top: 60px;
        padding-bottom: 60px;
      }
    }
    .glow-number {
      font-size: 56px;
      font-weight: 700;
      line-height: 1;
      background: linear-gradient(135deg, #00D4FF, #0077FF);
      -webkit-background-clip: text;
      -webkit-text-fill-color: transparent;
      background-clip: text;
      text-shadow: 0 0 16px rgba(0,212,255,0.5);
      margin-bottom: 0.5rem;
    }
    .faq-item {
      border-bottom: 1px solid rgba(0,0,0,0.08);
    }
    .faq-question {
      cursor: pointer;
      display: flex;
      justify-content: space-between;
      align-items: center;
      padding: 1.2rem 0;
      font-weight: 600;
      color: var(--text-dark);
      transition: color 0.2s;
    }
    .faq-question:hover {
      color: var(--accent-blue);
    }
    .faq-answer {
      max-height: 0;
      overflow: hidden;
      transition: max-height 0.3s ease;
      color: var(--text-gray);
      padding-right: 1rem;
    }
    .faq-answer.open {
      max-height: 200px;
      padding-bottom: 1rem;
    }
    .icon-glow {
      color: var(--accent-cyan);
      filter: drop-shadow(0 0 6px rgba(0,212,255,0.6));
    }
    .hero-bg {
      background-image: url('/assets/images/backpic/back-1.webp');
      background-size: cover;
      background-position: center;
      position: relative;
    }
    .hero-overlay {
      background: radial-gradient(circle at 30% 40%, rgba(0,20,40,0.7) 0%, #0A0F1A 100%);
      position: absolute;
      inset: 0;
    }
    .testimonial-avatar {
      width: 56px;
      height: 56px;
      border-radius: 50%;
      object-fit: cover;
      border: 2px solid rgba(0,212,255,0.3);
    }