/* roulang page: index */
:root {
      --primary: #0F172A;
      --accent: #6366F1;
      --accent-teal: #06B6D4;
      --accent-green: #10B981;
      --bg-light: #F8FAFC;
      --bg-dark: #0B0F19;
      --text-main: #0F172A;
      --text-muted: #475569;
      --border-subtle: rgba(226, 232, 240, 0.8);
      --card-shadow: 0 8px 30px rgba(0, 0, 0, 0.04);
      --radius-box: 1rem;
    }
    body {
      color: var(--text-main);
      background-color: var(--bg-light);
      -webkit-font-smoothing: antialiased;
      overflow-x: hidden;
    }
    .frosted-nav {
      background: rgba(15, 23, 42, 0.85);
      backdrop-filter: blur(16px);
      -webkit-backdrop-filter: blur(16px);
      border: 1px solid rgba(255, 255, 255, 0.12);
    }
    .glow-accent {
      box-shadow: 0 0 25px rgba(99, 102, 241, 0.45);
    }
    .glow-teal {
      box-shadow: 0 0 25px rgba(6, 182, 212, 0.35);
    }
    .video-hero-overlay {
      background: linear-gradient(180deg, rgba(11, 15, 25, 0.82) 0%, rgba(15, 23, 42, 0.94) 100%);
    }
    details summary::-webkit-details-marker {
      display: none;
    }