/* roulang page: index */
:root {
      --bg-main: #0B111E;
      --bg-alt: #10192A;
      --accent-orange: #FF4D26;
      --accent-cyan: #00D2FF;
      --text-main: #F8FAFC;
      --text-muted: #94A3B8;
      --border-glass: rgba(0, 210, 255, 0.15);
    }
    
    html {
      scroll-behavior: smooth;
    }
    
    body {
      background-color: var(--bg-main);
      color: var(--text-main);
      font-family: 'Noto Sans SC', sans-serif;
      overflow-x: hidden;
    }

    .glass-panel {
      background: rgba(19, 29, 49, 0.72);
      backdrop-filter: blur(12px);
      -webkit-backdrop-filter: blur(12px);
      border: 1px solid var(--border-glass);
      transition: all 0.3s cubic-bezier(0.4, 0, 0.2, 1);
    }

    .glass-panel:hover {
      border-color: rgba(0, 210, 255, 0.45);
      box-shadow: 0 8px 32px rgba(0, 210, 255, 0.12);
      transform: translateY(-2px);
    }

    .glass-panel-orange {
      background: rgba(25, 20, 30, 0.75);
      backdrop-filter: blur(12px);
      border: 1px solid rgba(255, 77, 38, 0.25);
      transition: all 0.3s ease;
    }

    .glass-panel-orange:hover {
      border-color: rgba(255, 77, 38, 0.6);
      box-shadow: 0 8px 32px rgba(255, 77, 38, 0.15);
      transform: translateY(-2px);
    }

    .btn-fire {
      background: linear-gradient(135deg, #FF5722 0%, #E63900 100%);
      box-shadow: 0 0 24px rgba(255, 77, 38, 0.45);
      transition: all 0.25s ease;
    }

    .btn-fire:hover {
      background: linear-gradient(135deg, #FF6E3A 0%, #FF3D00 100%);
      box-shadow: 0 0 32px rgba(255, 77, 38, 0.7);
      transform: scale(1.02);
    }

    .btn-cyan {
      background: linear-gradient(135deg, #00D2FF 0%, #0088CC 100%);
      box-shadow: 0 0 20px rgba(0, 210, 255, 0.35);
      transition: all 0.25s ease;
    }

    .btn-cyan:hover {
      background: linear-gradient(135deg, #33DCFF 0%, #009DE6 100%);
      box-shadow: 0 0 30px rgba(0, 210, 255, 0.6);
      transform: scale(1.02);
    }

    .tech-border-corner {
      position: relative;
    }
    .tech-border-corner::before,
    .tech-border-corner::after {
      content: '';
      position: absolute;
      width: 10px;
      height: 10px;
      pointer-events: none;
    }
    .tech-border-corner::before {
      top: -1px;
      left: -1px;
      border-top: 2px solid var(--accent-cyan);
      border-left: 2px solid var(--accent-cyan);
    }
    .tech-border-corner::after {
      bottom: -1px;
      right: -1px;
      border-bottom: 2px solid var(--accent-cyan);
      border-right: 2px solid var(--accent-cyan);
    }

    .hero-mask {
      background: linear-gradient(180deg, rgba(11, 17, 30, 0.85) 0%, rgba(11, 17, 30, 0.96) 80%, #0B111E 100%);
    }

    /* Accordion transitions */
    .faq-answer {
      max-height: 0;
      overflow: hidden;
      transition: max-height 0.35s cubic-bezier(0, 1, 0, 1);
    }
    .faq-item.active .faq-answer {
      max-height: 500px;
      transition: max-height 0.4s ease-in-out;
    }
    .faq-item.active .faq-icon {
      transform: rotate(180deg);
    }