/* roulang page: index */
:root {
      --bg-dark: #060b19;
      --bg-alt: #0a1226;
      --bg-card: rgba(16, 27, 54, 0.75);
      --cyan: #00f0ff;
      --blue: #0072ff;
      --purple: #7928ca;
      --text-main: #f1f5f9;
      --text-muted: #94a3b8;
      --border-glow: rgba(0, 240, 255, 0.2);
    }
    body {
      background-color: var(--bg-dark);
      color: var(--text-main);
      font-family: -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, "Helvetica Neue", Arial, sans-serif;
      overflow-x: hidden;
    }
    .glass-card {
      background: var(--bg-card);
      backdrop-filter: blur(16px);
      -webkit-backdrop-filter: blur(16px);
      border: 1px solid var(--border-glow);
      box-shadow: inset 0 1px 1px rgba(255, 255, 255, 0.08);
      transition: all 0.3s ease;
    }
    .glass-card:hover {
      border-color: rgba(0, 240, 255, 0.5);
      box-shadow: 0 8px 30px rgba(0, 114, 255, 0.2), inset 0 1px 1px rgba(255, 255, 255, 0.15);
      transform: translateY(-2px);
    }
    .btn-glow {
      background: linear-gradient(135deg, #00f0ff, #0072ff);
      box-shadow: 0 0 15px rgba(0, 240, 255, 0.3);
      transition: all 0.3s ease;
    }
    .btn-glow:hover {
      box-shadow: 0 0 25px rgba(0, 240, 255, 0.65);
      transform: translateY(-2px);
    }
    .text-glow {
      text-shadow: 0 0 20px rgba(0, 240, 255, 0.4);
    }
    .accordion-body {
      max-height: 0;
      overflow: hidden;
      transition: max-height 0.35s ease-out;
    }
    .accordion-body.open {
      max-height: 300px;
    }