/* roulang page: index */
:root {
      --primary: #2563EB;
      --primary-dark: #1D4ED8;
      --indigo-accent: #4F46E5;
      --cyan-highlight: #06B6D4;
      --slate-900: #0F172A;
      --slate-800: #1E293B;
      --slate-700: #334155;
      --slate-500: #64748B;
      --slate-100: #F1F5F9;
      --slate-50: #F8FAFC;
    }
    html {
      scroll-behavior: smooth;
      font-family: -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, "PingFang SC", "Hiragino Sans GB", "Microsoft YaHei", sans-serif;
    }
    body {
      background-color: var(--slate-50);
      color: var(--slate-700);
      line-height: 1.75;
    }
    .custom-card-shadow {
      box-shadow: 0 4px 20px -2px rgba(15, 23, 42, 0.05), 0 2px 6px -1px rgba(15, 23, 42, 0.03);
    }
    .hero-matrix-bg {
      background: radial-gradient(circle at top right, rgba(37, 99, 235, 0.08), transparent 50%),
                  radial-gradient(circle at bottom left, rgba(6, 182, 212, 0.08), transparent 50%),
                  #ffffff;
    }
    .section-badge {
      display: inline-flex;
      align-items: center;
      gap: 0.5rem;
      padding: 0.35rem 0.85rem;
      border-radius: 9999px;
      font-size: 0.875rem;
      font-weight: 600;
      background-color: rgba(37, 99, 235, 0.08);
      color: var(--primary);
      border: 1px solid rgba(37, 99, 235, 0.15);
    }
    .accordion-content {
      max-height: 0;
      overflow: hidden;
      transition: max-height 0.3s ease-out;
    }
    .accordion-open .accordion-content {
      max-height: 300px;
    }
    .accordion-open .accordion-icon {
      transform: rotate(180deg);
    }