/* roulang page: index */
:root {
      --bg-dark: #070b14;
      --bg-sec: #0b1324;
      --card-bg: rgba(16, 29, 54, 0.72);
      --card-border: rgba(255, 255, 255, 0.08);
      --glow-cyan: #00f2fe;
      --glow-blue: #4facfe;
      --text-main: #f8fafc;
      --text-muted: #94a3b8;
    }
    body {
      font-family: -apple-system, BlinkMacSystemFont, "PingFang SC", "Hiragino Sans GB", "Microsoft YaHei", sans-serif;
      background-color: var(--bg-dark);
      color: var(--text-main);
      line-height: 1.75;
      overflow-x: hidden;
    }
    .glass-card {
      background-color: var(--card-bg);
      backdrop-filter: blur(12px);
      -webkit-backdrop-filter: blur(12px);
      border: 1px solid var(--card-border);
      transition: all 0.3s cubic-bezier(0.4, 0, 0.2, 1);
    }
    .glass-card:hover {
      border-color: rgba(0, 242, 254, 0.35);
      box-shadow: 0 10px 30px -10px rgba(0, 242, 254, 0.2);
      transform: translateY(-2px);
    }
    .btn-glow {
      background: linear-gradient(135deg, #00f2fe 0%, #4facfe 100%);
      color: #070b14;
      font-weight: 600;
      box-shadow: 0 0 25px rgba(0, 242, 254, 0.45);
      transition: all 0.3s ease;
      min-height: 44px;
      display: inline-flex;
      align-items: center;
      justify-content: center;
    }
    .btn-glow:hover {
      box-shadow: 0 0 35px rgba(0, 242, 254, 0.7);
      transform: translateY(-2px);
    }
    .btn-outline {
      border: 1px solid rgba(0, 242, 254, 0.4);
      color: #00f2fe;
      background: rgba(0, 242, 254, 0.05);
      transition: all 0.3s ease;
      min-height: 44px;
      display: inline-flex;
      align-items: center;
      justify-content: center;
    }
    .btn-outline:hover {
      background: rgba(0, 242, 254, 0.15);
      border-color: #00f2fe;
      transform: translateY(-2px);
    }
    .faq-answer {
      max-height: 0;
      opacity: 0;
      overflow: hidden;
      transition: max-height 0.35s ease, opacity 0.35s ease;
    }
    .faq-item.active .faq-answer {
      max-height: 240px;
      opacity: 1;
    }
    .faq-item.active .faq-icon {
      transform: rotate(180deg);
    }
    .hero-mask {
      background: linear-gradient(180deg, rgba(7, 11, 20, 0.75) 0%, rgba(7, 11, 20, 0.95) 100%);
    }
    .text-gradient {
      background: linear-gradient(135deg, #ffffff 20%, #00f2fe 80%);
      -webkit-background-clip: text;
      -webkit-text-fill-color: transparent;
    }