/* roulang page: index */
:root {
            --primary-blue: #1E40AF;
            --secondary-blue: #0EA5E9;
            --bg-base: #F8FAFC;
            --text-dark: #0F172A;
            --text-body: #334155;
            --text-light: #64748B;
            --white: #FFFFFF;
            --shadow-sm: 0 4px 6px -1px rgba(15, 23, 42, 0.05), 0 2px 4px -2px rgba(15, 23, 42, 0.03);
            --shadow-lg: 0 20px 25px -5px rgba(30, 64, 175, 0.1), 0 8px 10px -6px rgba(30, 64, 175, 0.04);
            --radius: 12px;
        }

        * { box-sizing: border-box; margin: 0; padding: 0; }
        body { font-family: -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, Helvetica, Arial, sans-serif; line-height: 1.6; color: var(--text-body); background: var(--bg-base); }
        .container { max-width: 1200px; margin: 0 auto; padding: 0 20px; }
        a { text-decoration: none; color: inherit; transition: 0.3s; }
        
        /* Header */
        .site-header { position: sticky; top: 0; background: rgba(255, 255, 255, 0.9); backdrop-filter: blur(8px); border-bottom: 1px solid #E2E8F0; z-index: 1000; padding: 16px 0; }
        .nav-wrapper { display: flex; align-items: center; justify-content: space-between; }
        .logo { font-size: 20px; font-weight: 700; color: var(--primary-blue); display: flex; align-items: center; gap: 8px; }
        .nav-links { display: flex; gap: 24px; align-items: center; }
        .nav-link { color: var(--text-dark); font-weight: 500; font-size: 14px; }
        .btn-cta { background: var(--primary-blue); color: #fff; padding: 10px 20px; border-radius: 8px; font-weight: 600; cursor: pointer; }
        
        /* Sections */
        section { padding: 96px 0; }
        h2 { font-size: 36px; color: var(--text-dark); margin-bottom: 48px; text-align: center; }
        .hero { padding: 80px 0; display: flex; align-items: center; justify-content: space-between; gap: 60px; min-height: 600px; background: url('/assets/images/f23ff58aa8cb85b7.webp') center/cover no-repeat; }
        .hero-content { flex: 1; color: var(--white); }
        .hero h1 { font-size: 48px; margin-bottom: 24px; }
        
        /* Cards */
        .grid-3 { display: grid; grid-template-columns: repeat(3, 1fr); gap: 24px; }
        .card { background: var(--white); padding: 32px; border-radius: var(--radius); box-shadow: var(--shadow-sm); transition: 0.3s; border: 1px solid #E2E8F0; }
        .card:hover { transform: translateY(-4px); box-shadow: var(--shadow-lg); }
        
        /* Footer */
        footer { background: #0F172A; color: #94A3B8; padding: 80px 0 40px; }
        .footer-grid { display: grid; grid-template-columns: repeat(4, 1fr); gap: 40px; }
        .footer-logo { color: var(--white); font-weight: bold; font-size: 20px; margin-bottom: 20px; }
        
        @media (max-width: 768px) {
            .grid-3 { grid-template-columns: 1fr; }
            .hero { flex-direction: column; text-align: center; padding: 40px 20px; }
            .footer-grid { grid-template-columns: 1fr 1fr; }
        }