/* roulang page: index */
:root {
      --primary-color: #1d4ed8;
      --primary-hover: #2563eb;
      --bg-light: #f8fafc;
      --text-main: #0f172a;
      --text-muted: #64748b;
      --card-border: #e2e8f0;
    }
    html {
      scroll-behavior: smooth;
      font-family: system-ui, -apple-system, BlinkMacSystemFont, "Segoe UI", "PingFang SC", "Hiragino Sans GB", "Microsoft YaHei", sans-serif;
    }
    .custom-shadow {
      box-shadow: 0 4px 20px -2px rgba(15, 23, 42, 0.05), 0 2px 6px -1px rgba(15, 23, 42, 0.03);
    }
    .custom-shadow-hover {
      transition: all 0.3s cubic-bezier(0.4, 0, 0.2, 1);
    }
    .custom-shadow-hover:hover {
      transform: translateY(-4px);
      box-shadow: 0 20px 25px -5px rgba(29, 78, 216, 0.08), 0 10px 10px -5px rgba(29, 78, 216, 0.04);
    }
    .hero-bg {
      background: linear-gradient(135deg, rgba(15, 23, 42, 0.85) 0%, rgba(29, 78, 216, 0.75) 100%), url('/assets/images/02331b33445b7cfd.webp') center/cover no-repeat;
    }
    .dark-section-bg {
      background: linear-gradient(180deg, #0b1120 0%, #0f172a 100%);
    }
    .accordion-content {
      max-height: 0;
      overflow: hidden;
      transition: max-height 0.3s ease-out, opacity 0.2s ease-out;
      opacity: 0;
    }
    .accordion-content.active {
      opacity: 1;
    }