/* roulang page: index */
:root {
      --primary: #0F172A;
      --accent: #0284C7;
      --accent-alt: #10B981;
      --bg-base: #F8FAFC;
      --text-main: #1E293B;
      --text-muted: #64748B;
      --card-bg: #FFFFFF;
      --border-color: #E2E8F0;
    }
    body {
      color: var(--text-main);
      background-color: var(--bg-base);
      font-family: -apple-system, BlinkMacSystemFont, "Segoe UI", "PingFang SC", "Hiragino Sans GB", "Microsoft YaHei", sans-serif;
      line-height: 1.65;
      -webkit-font-smoothing: antialiased;
    }
    .hero-bg {
      background-image: linear-gradient(to right, rgba(2, 6, 23, 0.95), rgba(15, 23, 42, 0.92)), url('/assets/images/4511d39d7066885e.png');
      background-size: cover;
      background-position: center;
    }
    .tech-bg {
      background-image: linear-gradient(to bottom, rgba(2, 6, 23, 0.98), rgba(15, 23, 42, 0.95)), url('/assets/images/c300f109d716490c.jpg');
      background-size: cover;
      background-position: center;
    }
    .cta-banner-bg {
      background-image: linear-gradient(135deg, rgba(15, 23, 42, 0.96), rgba(2, 132, 199, 0.9)), url('/assets/images/7b0495edbb97d1a1.jpg');
      background-size: cover;
      background-position: center;
    }
    .smooth-scroll {
      scroll-behavior: smooth;
    }
    .code-scroll::-webkit-scrollbar {
      height: 6px;
      width: 6px;
    }
    .code-scroll::-webkit-scrollbar-thumb {
      background: #334155;
      border-radius: 3px;
    }
    details summary::-webkit-details-marker {
      display: none;
    }