:root {
            --primary-color: #0074a2;
            --secondary-color: #004a59;
            --accent-color: #00ccff;
            --text-color: #333;
            --bg-body: #f4f4f4;
            --white: #ffffff;
        }

        body {
            font-family: -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, Helvetica, Arial, sans-serif;
            margin: 0;
            padding: 0;
            line-height: 1.6;
            color: var(--text-color);
            background-image: url('/assets/background_1.png');
            background-attachment: fixed;
        }

        header {
            background: var(--primary-color);
            color: var(--white);
            padding: 2rem 1rem;
            text-align: center;
        }

        .container { max-width: 1100px; margin: auto; padding: 0 20px; }
        
        nav { background: var(--secondary-color); padding: 0.5rem 0; }
        nav ul { list-style: none; padding: 0; margin: 0; display: flex; flex-wrap: wrap; justify-content: center; }
        nav li a { color: white; padding: 10px 15px; text-decoration: none; font-size: 0.9rem; }
        
        .hero-section { padding: 40px 0; }
        .grid { display: grid; grid-template-columns: repeat(auto-fill, minmax(280px, 1fr)); gap: 20px; padding: 20px 0; }
        .card { background: var(--white); padding: 15px; border-radius: 8px; box-shadow: 0 2px 5px rgba(0,0,0,0.1); }
        .card-img-placeholder { width: 100%; height: 200px; background: linear-gradient(45deg, #00739c, #00b04e); border-radius: 4px; margin-bottom: 10px; }
        
        footer { background: #000; color: #fff; text-align: center; padding: 20px; margin-top: 40px; }

        @media (min-width: 768px) { nav ul { justify-content: left; } }
        
        .whatsapp-float {
            position: fixed; bottom: 20px; right: 20px;
            background: #25d366; color: white; padding: 15px 20px;
            border-radius: 50px; font-weight: bold; text-decoration: none;
        }