/* roulang page: index */
:root {
      --primary: #0284c7;
      --primary-dark: #0369a1;
      --accent: #10b981;
      --slate-dark: #0f172a;
      --bg-light: #f8fafc;
      --text-main: #0f172a;
      --text-muted: #475569;
    }
    html {
      scroll-behavior: smooth;
    }
    body {
      font-family: -apple-system, BlinkMacSystemFont, "PingFang SC", "Hiragino Sans GB", "Microsoft YaHei", "WenQuanYi Micro Hei", sans-serif;
      background-color: var(--bg-light);
      color: var(--text-main);
      overflow-x: hidden;
    }
    .video-hero-bg {
      background-image: linear-gradient(rgba(15, 23, 42, 0.78), rgba(15, 23, 42, 0.85)), url('/assets/images/4734853627006304.jpg');
      background-size: cover;
      background-position: center;
      background-repeat: no-repeat;
    }
    .grid-pattern {
      background-size: 32px 32px;
      background-image: linear-gradient(to right, rgba(226, 232, 240, 0.6) 1px, transparent 1px),
                        linear-gradient(to bottom, rgba(226, 232, 240, 0.6) 1px, transparent 1px);
    }
    .card-hover-effect {
      transition: transform 0.28s ease, box-shadow 0.28s ease;
    }
    .card-hover-effect:hover {
      transform: translateY(-4px);
      box-shadow: 0 20px 25px -5px rgba(0, 0, 0, 0.08), 0 8px 10px -6px rgba(0, 0, 0, 0.05);
    }
    details summary::-webkit-details-marker {
      display: none;
    }