/* roulang page: index */
:root {
      --primary: #0284C7;
      --primary-dark: #0F172A;
      --accent: #F59E0B;
      --bg-slate: #F8FAFC;
      --text-main: #1E293B;
      --text-muted: #64748B;
    }
    html {
      scroll-behavior: smooth;
    }
    body {
      font-family: -apple-system, "PingFang SC", "Microsoft YaHei", "Helvetica Neue", sans-serif;
      color: var(--text-main);
      background-color: var(--bg-slate);
      line-height: 1.75;
    }
    .heading-tight {
      line-height: 1.3;
      letter-spacing: -0.02em;
    }
    .hero-banner {
      background: linear-gradient(135deg, rgba(15, 23, 42, 0.95), rgba(2, 132, 199, 0.88)), url('/assets/images/b2df10b53901fe60.webp') center/cover no-repeat;
    }
    .dark-section {
      background: linear-gradient(180deg, #0B1120 0%, #0F172A 100%);
    }
    .card-transition {
      transition: all 0.3s cubic-bezier(0.4, 0, 0.2, 1);
    }
    .card-transition:hover {
      transform: translateY(-4px);
      box-shadow: 0 16px 32px -8px rgba(15, 23, 42, 0.12);
    }