/* roulang page: index */
:root {
      --primary: #0D4B57;
      --primary-light: #16697A;
      --accent: #00D2B4;
      --amber: #FF9F43;
      --canvas: #F4F7F9;
      --text-main: #1F2937;
      --text-muted: #4B5563;
    }
    html {
      scroll-behavior: smooth;
      font-family: system-ui, -apple-system, "PingFang SC", "Microsoft YaHei", "Source Han Sans CN", sans-serif;
    }
    body {
      background-color: var(--canvas);
      color: var(--text-main);
      overflow-x: hidden;
      line-height: 1.75;
    }
    .custom-shadow {
      box-shadow: 0 4px 20px -2px rgba(13, 75, 87, 0.08);
    }
    .hover-up {
      transition: all 0.3s cubic-bezier(0.4, 0, 0.2, 1);
    }
    .hover-up:hover {
      transform: translateY(-4px);
      box-shadow: 0 12px 28px -4px rgba(13, 75, 87, 0.16);
    }
    .hero-bg {
      background-image: linear-gradient(to right, rgba(10, 25, 36, 0.95), rgba(13, 75, 87, 0.85)), url('/assets/images/8bbedc6ad5da860b.png');
      background-size: cover;
      background-position: center;
    }
    .dark-sec-bg {
      background-image: linear-gradient(180deg, #0A1924 0%, #112331 100%);
    }