/* roulang page: index */
:root {
      --primary-navy: #0B192C;
      --accent-teal: #00B894;
      --accent-emerald: #00C2A8;
      --bg-light: #F8FAFC;
      --text-main: #0F172A;
      --text-muted: #475569;
      --border-color: rgba(226, 232, 240, 0.8);
      --card-shadow: 0 4px 20px -2px rgba(0, 0, 0, 0.05);
    }
    html {
      scroll-behavior: smooth;
      scroll-padding-top: 88px;
    }
    body {
      font-family: system-ui, -apple-system, "SF Pro Display", "PingFang SC", "Segoe UI", "Microsoft YaHei", sans-serif;
      color: var(--text-main);
      background-color: #FFFFFF;
      overflow-x: hidden;
    }
    .custom-scrollbar::-webkit-scrollbar {
      width: 6px;
      height: 6px;
    }
    .custom-scrollbar::-webkit-scrollbar-thumb {
      background: rgba(0, 184, 148, 0.3);
      border-radius: 3px;
    }
    .hero-mask {
      background: linear-gradient(135deg, rgba(11, 25, 44, 0.94) 0%, rgba(15, 23, 42, 0.88) 100%);
    }
    .tech-grid-pattern {
      background-image: radial-gradient(rgba(0, 184, 148, 0.15) 1px, transparent 1px);
      background-size: 24px 24px;
    }
    .card-hover-effect {
      transition: all 0.3s cubic-bezier(0.4, 0, 0.2, 1);
    }
    .card-hover-effect:hover {
      transform: translateY(-4px);
      box-shadow: 0 12px 30px -4px rgba(0, 0, 0, 0.08);
      border-color: rgba(0, 184, 148, 0.4);
    }
    details summary::-webkit-details-marker {
      display: none;
    }