/* roulang page: index */
:root {
      --primary: #1E56A0;
      --secondary: #00A8CC;
      --dark-navy: #0F1E36;
      --bg-light: #F8FAFC;
      --surface: #FFFFFF;
      --text-main: #0F172A;
      --text-body: #334155;
      --text-muted: #64748B;
      --border-color: #E2E8F0;
    }

    html {
      scroll-behavior: smooth;
    }

    body {
      font-family: -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, "Helvetica Neue", Arial, "PingFang SC", "Hiragino Sans GB", "Microsoft YaHei", sans-serif;
      background-color: var(--bg-light);
      color: var(--text-body);
      overflow-x: hidden;
    }

    .hero-bg {
      background-image: linear-gradient(180deg, rgba(15, 30, 54, 0.88) 0%, rgba(30, 86, 160, 0.82) 100%), url('/assets/images/9b9af9a93e934bb3.jpg');
      background-size: cover;
      background-position: center;
    }

    .dark-matrix-bg {
      background-color: var(--dark-navy);
      background-image: radial-gradient(rgba(0, 168, 204, 0.12) 1px, transparent 0);
      background-size: 24px 24px;
    }

    .card-shadow {
      box-shadow: 0 4px 6px -1px rgba(15, 23, 42, 0.05), 0 2px 4px -2px rgba(15, 23, 42, 0.05);
      border: 1px solid var(--border-color);
      transition: all 0.3s cubic-bezier(0.4, 0, 0.2, 1);
    }

    .card-shadow:hover {
      transform: translateY(-4px);
      box-shadow: 0 20px 25px -5px rgba(15, 23, 42, 0.08), 0 8px 10px -6px rgba(15, 23, 42, 0.04);
      border-color: rgba(0, 168, 204, 0.35);
    }

    details summary::-webkit-details-marker {
      display: none;
    }
    details[open] summary .faq-icon {
      transform: rotate(180deg);
    }
    details[open] {
      border-color: var(--primary);
    }