/* roulang page: index */
:root {
      --brand-primary: #1D4ED8;
      --brand-hover: #1E40AF;
      --brand-accent: #F97316;
      --bg-page: #F8FAFC;
      --text-main: #0F172A;
      --text-muted: #334155;
      --text-sub: #64748B;
      --border-color: #E2E8F0;
    }
    body {
      background-color: var(--bg-page);
      color: var(--text-muted);
      font-family: var(--font-sans, -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, "PingFang SC", "Microsoft YaHei", sans-serif);
      -webkit-font-smoothing: antialiased;
    }
    .custom-shadow {
      box-shadow: 0 8px 30px rgba(0, 0, 0, 0.04);
    }
    .custom-shadow-hover:hover {
      box-shadow: 0 20px 35px rgba(29, 78, 216, 0.08);
    }
    .hero-slide {
      display: none;
      opacity: 0;
      transition: opacity 0.6s cubic-bezier(0.4, 0, 0.2, 1);
    }
    .hero-slide.active {
      display: block;
      opacity: 1;
    }
    .gradient-banner {
      background: linear-gradient(135deg, #1E40AF 0%, #1D4ED8 50%, #0F172A 100%);
    }
    .tab-content {
      display: none;
    }
    .tab-content.active {
      display: block;
    }