/* roulang page: index */
:root {
      --primary: #0F52BA;
      --primary-dark: #0A192F;
      --accent: #00A86B;
      --bg-page: #F8FAFC;
      --surface: #FFFFFF;
      --text-main: #0F172A;
      --text-body: #334155;
      --text-muted: #64748B;
      --border-light: rgba(226, 232, 240, 0.9);
      --shadow-card: 0 4px 20px -2px rgba(15, 82, 186, 0.05);
      --shadow-hover: 0 14px 30px -4px rgba(15, 82, 186, 0.12);
    }
    html {
      scroll-behavior: smooth;
    }
    body {
      background-color: var(--bg-page);
      color: var(--text-body);
      font-family: -apple-system, BlinkMacSystemFont, "Segoe UI", "PingFang SC", "Hiragino Sans GB", "Microsoft YaHei", sans-serif;
      line-height: 1.7;
    }
    .custom-shadow {
      box-shadow: var(--shadow-card);
      border: 1px solid var(--border-light);
      transition: all 0.3s cubic-bezier(0.16, 1, 0.3, 1);
    }
    .custom-shadow:hover {
      box-shadow: var(--shadow-hover);
      transform: translateY(-4px);
    }
    .hero-bg {
      background-image: linear-gradient(rgba(10, 25, 47, 0.88), rgba(10, 25, 47, 0.82)), url('/assets/images/8370e3d7920c0dee.jpg');
      background-size: cover;
      background-position: center;
    }
    .dark-section-bg {
      background-image: linear-gradient(rgba(10, 25, 47, 0.94), rgba(10, 25, 47, 0.96)), url('/assets/images/0964c1650472490a.jpg');
      background-size: cover;
      background-position: center;
    }
    .accordion-content {
      max-height: 0;
      overflow: hidden;
      transition: max-height 0.3s ease-out, opacity 0.2s ease-in;
      opacity: 0;
    }
    .accordion-item.active .accordion-content {
      opacity: 1;
    }
    .accordion-item.active .accordion-icon {
      transform: rotate(180deg);
    }