/* roulang page: index */
:root {
      --primary: #1A1D20;
      --accent: #00DC82;
      --accent-hover: #059669;
      --bg-light: #FAFAFA;
      --dark-card: #0D1117;
      --border-color: #E2E8F0;
    }
    html {
      scroll-behavior: smooth;
      font-family: system-ui, -apple-system, "PingFang SC", "Microsoft YaHei", sans-serif;
    }
    body {
      background-color: var(--bg-light);
      color: #334155;
      line-height: 1.75;
      overflow-x: hidden;
    }
    .hero-bg {
      background: linear-gradient(135deg, rgba(26, 29, 32, 0.94) 0%, rgba(13, 17, 23, 0.88) 100%),
                  url('/assets/images/25797b5ad8c55f19.jpg') center/cover no-repeat;
    }
    .carbon-bg {
      background: linear-gradient(180deg, #0D1117 0%, #161B22 100%);
    }
    .card-hover {
      transition: all 0.25s cubic-bezier(0.4, 0, 0.2, 1);
    }
    .card-hover:hover {
      transform: translateY(-4px);
      box-shadow: 0 12px 28px -6px rgba(15, 23, 42, 0.12);
    }
    .step-line::after {
      content: '';
      position: absolute;
      top: 24px;
      right: -50%;
      width: 100%;
      height: 2px;
      background: #CBD5E1;
      z-index: 1;
    }
    @media (max-width: 1023px) {
      .step-line::after {
        display: none;
      }
    }