/* roulang page: index */
:root {
      --primary: #0A0F1D;
      --primary-focus: #0F172A;
      --accent: #00E599;
      --accent-hover: #00C885;
      --accent-orange: #FF6B00;
      --text-main: #0F172A;
      --text-muted: #64748B;
      --surface-light: #F8FAFC;
      --border-dark: rgba(51, 65, 85, 0.7);
      --radius-card: 12px;
    }

    * {
      box-sizing: border-box;
      margin: 0;
      padding: 0;
    }

    body {
      font-family: system-ui, -apple-system, "PingFang SC", "Microsoft YaHei", sans-serif;
      background-color: #0A0F1D;
      color: #F8FAFC;
      line-height: 1.75;
      overflow-x: hidden;
    }

    .font-sport {
      letter-spacing: -0.025em;
      line-height: 1.28;
    }

    .glass-nav {
      background: rgba(10, 15, 29, 0.88);
      backdrop-filter: blur(14px);
      border-bottom: 1px solid rgba(255, 255, 255, 0.08);
    }

    .card-dark {
      background-color: #0F172A;
      border: 1px solid rgba(51, 65, 85, 0.6);
      box-shadow: 0 10px 25px -5px rgba(0, 0, 0, 0.35);
      border-radius: var(--radius-card);
      transition: all 0.3s cubic-bezier(0.4, 0, 0.2, 1);
    }

    .card-dark:hover {
      border-color: rgba(0, 229, 153, 0.45);
      transform: translateY(-3px);
      box-shadow: 0 16px 30px -8px rgba(0, 229, 153, 0.15);
    }

    .card-light {
      background-color: #FFFFFF;
      border: 1px solid #E2E8F0;
      box-shadow: 0 4px 12px rgba(15, 23, 42, 0.05);
      border-radius: var(--radius-card);
      transition: all 0.3s ease;
    }

    .card-light:hover {
      box-shadow: 0 12px 24px -4px rgba(15, 23, 42, 0.12);
      transform: translateY(-2px);
    }

    .glow-accent {
      box-shadow: 0 0 25px rgba(0, 229, 153, 0.28);
    }

    .badge-neon {
      background: rgba(0, 229, 153, 0.12);
      color: #00E599;
      border: 1px solid rgba(0, 229, 153, 0.35);
    }

    .faq-answer {
      max-height: 0;
      overflow: hidden;
      transition: max-height 0.35s ease-out;
    }

    .faq-item.active .faq-answer {
      max-height: 280px;
    }

    .faq-item.active .faq-icon {
      transform: rotate(180deg);
    }

    .screen-stage {
      position: relative;
      border-radius: 16px;
      overflow: hidden;
      border: 1px solid rgba(0, 229, 153, 0.4);
      box-shadow: 0 20px 50px rgba(0, 0, 0, 0.7), 0 0 40px rgba(0, 229, 153, 0.15);
    }