/* roulang page: index */
:root {
      --c-black: #11141A;
      --c-charcoal: #1E232D;
      --c-orange: #EA580C;
      --c-amber: #F59E0B;
      --c-silver: #94A3B8;
      --c-surface: #F8FAFC;
      --c-border: #E2E8F0;
    }
    * {
      box-sizing: border-box;
      margin: 0;
      padding: 0;
    }
    body {
      font-family: -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, "PingFang SC", "Hiragino Sans GB", "Microsoft YaHei", sans-serif;
      color: #1E293B;
      background-color: #F8FAFC;
      line-height: 1.7;
      letter-spacing: -0.01em;
      overflow-x: hidden;
    }
    .hero-bg {
      background-image: linear-gradient(to right, rgba(17, 20, 26, 0.94), rgba(30, 35, 45, 0.88)), url('/assets/images/ca8c17280dd608bf.webp');
      background-size: cover;
      background-position: center;
    }
    .dark-panel-bg {
      background-image: linear-gradient(135deg, rgba(17, 20, 26, 0.98), rgba(30, 35, 45, 0.96)), url('/assets/images/40bd9038582bf5a8.webp');
      background-size: cover;
      background-position: center;
    }
    .tech-grid-pattern {
      background-image: radial-gradient(rgba(148, 163, 184, 0.15) 1px, transparent 0);
      background-size: 24px 24px;
    }
    .custom-scrollbar::-webkit-scrollbar {
      height: 6px;
    }
    .custom-scrollbar::-webkit-scrollbar-thumb {
      background: #CBD5E1;
      border-radius: 4px;
    }
    .accordion-content {
      max-height: 0;
      overflow: hidden;
      transition: max-height 0.35s ease-out;
    }
    .accordion-item.active .accordion-content {
      max-height: 240px;
    }
    .accordion-item.active .accordion-icon {
      transform: rotate(180deg);
    }