/* roulang page: index */
:root {
      --primary-neon: #00E599;
      --primary-dark: #0F141C;
      --primary-orange: #FF5E3A;
      --transition-base: cubic-bezier(0.16, 1, 0.3, 1) 0.3s;
    }
    html {
      scroll-behavior: smooth;
    }
    body {
      color: #334155;
      background-color: #FFFFFF;
      font-family: system-ui, -apple-system, "PingFang SC", "Segoe UI", sans-serif;
      overflow-x: hidden;
      line-height: 1.75;
    }
    .hero-perspective {
      perspective: 1200px;
    }
    .hero-skew-card {
      transform: rotateY(-8deg) rotateX(4deg) translateZ(0);
      transition: transform 0.5s var(--transition-base);
    }
    .hero-skew-card:hover {
      transform: rotateY(0deg) rotateX(0deg) scale(1.02);
    }
    .card-hover-fx {
      transition: transform 0.3s var(--transition-base), box-shadow 0.3s var(--transition-base), border-color 0.3s;
    }
    .card-hover-fx:hover {
      transform: translateY(-4px);
      box-shadow: 0 12px 30px -4px rgba(15, 20, 28, 0.08);
      border-color: rgba(0, 229, 153, 0.5);
    }
    .neon-glow-btn {
      box-shadow: 0 0 20px rgba(0, 229, 153, 0.35);
      transition: all 0.25s ease;
    }
    .neon-glow-btn:hover {
      box-shadow: 0 0 28px rgba(0, 229, 153, 0.6);
      transform: translateY(-1px);
    }
    .neon-glow-btn:active {
      transform: scale(0.98);
    }
    details summary::-webkit-details-marker {
      display: none;
    }
    details[open] summary .faq-icon {
      transform: rotate(180deg);
    }