/* roulang page: index */
:root {
      --brand-primary: #1E40AF;
      --brand-accent: #4F46E5;
      --brand-green: #059669;
      --brand-emerald: #10B981;
      --bg-light: #F8FAFC;
      --text-dark: #0F172A;
      --text-muted: #64748B;
      --radius-box: 1.25rem;
    }
    html {
      scroll-behavior: smooth;
    }
    body {
      font-family: -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, "PingFang SC", "Hiragino Sans GB", "Microsoft YaHei", sans-serif;
      color: var(--text-dark);
      background-color: var(--bg-light);
    }
    .hero-mask {
      background: linear-gradient(135deg, rgba(15, 23, 42, 0.88) 0%, rgba(30, 64, 175, 0.82) 50%, rgba(79, 70, 229, 0.78) 100%);
    }
    .glass-card {
      background: rgba(255, 255, 255, 0.95);
      backdrop-filter: blur(12px);
      box-shadow: 0 10px 30px -5px rgba(30, 64, 175, 0.08);
    }
    .badge-pill {
      background: rgba(79, 70, 229, 0.1);
      border: 1px solid rgba(79, 70, 229, 0.2);
    }
    .btn-gradient {
      background: linear-gradient(135deg, #1E40AF 0%, #4F46E5 100%);
      transition: all 0.3s ease;
    }
    .btn-gradient:hover {
      box-shadow: 0 8px 20px rgba(79, 70, 229, 0.35);
      transform: translateY(-2px);
    }
    .btn-green {
      background: linear-gradient(135deg, #059669 0%, #10B981 100%);
    }
    .btn-green:hover {
      box-shadow: 0 8px 20px rgba(16, 185, 129, 0.35);
      transform: translateY(-2px);
    }
    .card-hover {
      transition: transform 0.3s ease, box-shadow 0.3s ease;
    }
    .card-hover:hover {
      transform: translateY(-4px);
      box-shadow: 0 15px 35px -5px rgba(30, 64, 175, 0.12);
    }
    details > summary {
      list-style: none;
    }
    details > summary::-webkit-details-marker {
      display: none;
    }