/* roulang page: index */
:root {
      --primary-color: #1d4ed8;
      --secondary-color: #3b82f6;
      --accent-color: #f97316;
      --bg-base: #f8fafc;
      --text-main: #0f172a;
      --text-muted: #64748b;
      --border-color: #e2e8f0;
    }
    html {
      scroll-behavior: smooth;
      font-family: -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, "Helvetica Neue", Arial, "Noto Sans", sans-serif;
    }
    body {
      background-color: var(--bg-base);
      color: #334155;
      line-height: 1.6;
      overflow-x: hidden;
    }
    .custom-shadow {
      box-shadow: 0 4px 20px -2px rgba(15, 23, 42, 0.05);
      transition: all 0.3s cubic-bezier(0.4, 0, 0.2, 1);
    }
    .custom-shadow:hover {
      transform: translateY(-4px);
      box-shadow: 0 12px 28px -4px rgba(30, 64, 175, 0.12);
    }
    .hero-bg {
      background: linear-gradient(135deg, rgba(15, 23, 42, 0.88) 0%, rgba(30, 64, 175, 0.82) 100%), url('/assets/images/cd486118c7ae518b.jpg') center/cover no-repeat;
    }
    .dark-section-bg {
      background: radial-gradient(circle at top right, #1e293b, #0f172a);
    }
    .tab-active {
      border-bottom: 2px solid #2563eb;
      color: #1d4ed8;
      font-weight: 600;
    }