/* roulang page: index */
:root {
      --primary-navy: #0A192F;
      --accent-green: #00E676;
      --accent-orange: #FF6D00;
      --bg-surface: #F8FAFC;
      --text-main: #1E293B;
      --text-muted: #64748B;
      --border-color: #E2E8F0;
    }
    html {
      scroll-behavior: smooth;
    }
    body {
      font-family: system-ui, -apple-system, "PingFang SC", "Microsoft YaHei", sans-serif;
      color: var(--text-main);
      background-color: #FFFFFF;
      overflow-x: hidden;
      line-height: 1.65;
    }
    .hero-bg {
      background: radial-gradient(circle at 80% 20%, rgba(0, 230, 118, 0.08) 0%, transparent 50%),
                  radial-gradient(circle at 10% 80%, rgba(255, 109, 0, 0.05) 0%, transparent 40%),
                  #0A192F;
    }
    .btn-glow-green:hover {
      box-shadow: 0 0 20px rgba(0, 230, 118, 0.4);
      transform: translateY(-2px);
    }
    .btn-glow-orange:hover {
      box-shadow: 0 0 20px rgba(255, 109, 0, 0.4);
      transform: translateY(-2px);
    }
    .card-hover {
      transition: all 0.3s cubic-bezier(0.4, 0, 0.2, 1);
    }
    .card-hover:hover {
      transform: translateY(-4px);
      box-shadow: 0 12px 24px -10px rgba(10, 25, 47, 0.08);
      border-color: #CBD5E1;
    }
    .accordion-content {
      max-height: 0;
      overflow: hidden;
      transition: max-height 0.35s ease-out;
    }
    .accordion-item.active .accordion-content {
      max-height: 250px;
    }
    .accordion-item.active .accordion-icon {
      transform: rotate(180deg);
    }