/* roulang page: index */
:root {
      --bg-dark: #0B0D13;
      --card-bg: #131722;
      --card-hover: #1A1F2C;
      --border-glow: rgba(255, 255, 255, 0.08);
      --primary-gradient: linear-gradient(135deg, #6366F1 0%, #8B5CF6 100%);
      --cyan-gradient: linear-gradient(135deg, #06B6D4 0%, #10B981 100%);
    }

    body {
      background-color: var(--bg-dark);
      color: #F8FAFC;
      font-family: -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, "Helvetica Neue", Arial, "Noto Sans", sans-serif;
      overflow-x: hidden;
      -webkit-font-smoothing: antialiased;
    }

    .hero-glow {
      background: radial-gradient(circle at 50% 20%, rgba(99, 102, 241, 0.22) 0%, rgba(139, 92, 246, 0.08) 45%, transparent 70%);
    }

    .card-border {
      border: 1px solid var(--border-glow);
      transition: all 0.3s cubic-bezier(0.4, 0, 0.2, 1);
    }
    .card-border:hover {
      border-color: rgba(99, 102, 241, 0.45);
      box-shadow: 0 10px 30px -10px rgba(99, 102, 241, 0.25);
      transform: translateY(-2px);
    }

    .btn-gradient {
      background: var(--primary-gradient);
      box-shadow: 0 4px 20px rgba(99, 102, 241, 0.35);
      transition: all 0.25s ease;
    }
    .btn-gradient:hover {
      box-shadow: 0 6px 25px rgba(139, 92, 246, 0.55);
      transform: translateY(-1px);
    }

    .faq-answer {
      max-height: 0;
      overflow: hidden;
      transition: max-height 0.35s ease, opacity 0.3s ease;
      opacity: 0;
    }
    .faq-item.active .faq-answer {
      max-height: 240px;
      opacity: 1;
    }
    .faq-item.active .faq-icon {
      transform: rotate(180deg);
    }