/* roulang page: index */
:root {
      --primary-color: #0057D9;
      --secondary-color: #003A8C;
      --bg-color: #F8FAFC;
      --text-main: #1E293B;
      --text-muted: #64748B;
      --border-color: #E2E8F0;
      --shadow: 0 4px 12px rgba(0,0,0,0.05);
      --radius: 12px;
    }
    * { box-sizing: border-box; margin: 0; padding: 0; }
    body { font-family: -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, "Helvetica Neue", Arial, sans-serif; color: var(--text-main); line-height: 1.6; background-color: #ffffff; }
    .container { max-width: 1200px; margin: 0 auto; padding: 0 20px; }
    header { position: sticky; top: 0; z-index: 1000; background: rgba(255,255,255,0.95); backdrop-filter: blur(10px); border-bottom: 1px solid var(--border-color); padding: 15px 0; }
    .nav-inner { display: flex; justify-content: space-between; align-items: center; }
    .logo { font-size: 20px; font-weight: 700; color: var(--primary-color); text-decoration: none; }
    nav ul { display: flex; list-style: none; gap: 30px; }
    nav a { text-decoration: none; color: var(--text-main); font-weight: 500; font-size: 14px; transition: color 0.3s; }
    nav a:hover { color: var(--primary-color); }
    .btn { display: inline-block; padding: 10px 24px; border-radius: var(--radius); font-weight: 600; text-decoration: none; transition: all 0.3s; cursor: pointer; border: none; }
    .btn-primary { background: var(--primary-color); color: #fff; }
    .btn-primary:hover { background: var(--secondary-color); }
    .btn-outline { border: 1px solid var(--primary-color); color: var(--primary-color); }
    .btn-outline:hover { background: var(--primary-color); color: #fff; }
    section { padding: 80px 0; }
    .hero { background: var(--bg-color); padding: 100px 0; text-align: center; }
    .hero h1 { font-size: 48px; margin-bottom: 20px; color: var(--secondary-color); }
    .hero p { font-size: 18px; color: var(--text-muted); max-width: 700px; margin: 0 auto 30px; }
    .card-grid { display: grid; grid-template-columns: repeat(3, 1fr); gap: 30px; margin-top: 40px; }
    .card { background: #fff; padding: 30px; border-radius: var(--radius); border: 1px solid var(--border-color); transition: transform 0.3s, box-shadow 0.3s; }
    .card:hover { transform: translateY(-5px); box-shadow: var(--shadow); }
    .card h3 { margin-bottom: 15px; color: var(--primary-color); }
    .card p { font-size: 14px; color: var(--text-muted); }
    .stat-bar { background: var(--secondary-color); color: #fff; padding: 40px 0; text-align: center; }
    .stat-item { display: inline-block; padding: 0 40px; }
    .stat-num { font-size: 36px; font-weight: 700; display: block; }
    .footer { background: #1E293B; color: #94A3B8; padding: 60px 0; text-align: center; }
    @media (max-width: 768px) {
      .card-grid { grid-template-columns: 1fr; }
      .nav-menu { display: none; }
      .hero h1 { font-size: 32px; }
    }