/* roulang page: index */
:root {
      --primary: #0F766E;
      --primary-dark: #115E59;
      --accent: #EA580C;
      --accent-hover: #C2410C;
      --night: #0F172A;
      --night-deep: #134E4A;
      --surface: #F8FAFC;
      --text-main: #0F172A;
      --text-muted: #475569;
    }
    html {
      scroll-behavior: smooth;
      font-family: system-ui, -apple-system, "PingFang SC", "Hiragino Sans GB", "Microsoft YaHei", sans-serif;
    }
    body {
      color: var(--text-main);
      background-color: #FFFFFF;
      line-height: 1.7;
    }
    .custom-shadow {
      box-shadow: 0 4px 6px -1px rgba(15, 23, 42, 0.05), 0 2px 4px -2px rgba(15, 23, 42, 0.05);
    }
    .custom-shadow-hover:hover {
      box-shadow: 0 16px 28px -4px rgba(15, 118, 110, 0.16);
      transform: translateY(-4px);
    }
    .hero-bg {
      background: linear-gradient(135deg, rgba(15, 23, 42, 0.88) 0%, rgba(15, 118, 110, 0.85) 100%), url('/assets/images/4d55eb71823193eb.png') center/cover no-repeat;
    }
    .engine-bg {
      background: linear-gradient(145deg, #0F172A 0%, #134E4A 100%);
    }