:root {
            --primary: #0077b5;
            --dark: #212121;
            --light: #f4f4f4;
            --accent: #00b9e8;
        }
        body { font-family: 'Avenir Next', Avenir, Arial, sans-serif; line-height: 1.6; color: #333; margin: 0; padding: 0; }
        header { background: var(--dark); color: white; padding: 1rem 5%; display: flex; justify-content: space-between; align-items: center; }
        nav ul { display: flex; list-style: none; gap: 15px; }
        nav a { color: white; text-decoration: none; font-size: 0.9rem; }
        .hero { background: linear-gradient(135deg, #162d3d, #184a56); color: white; padding: 4rem 5%; text-align: center; }
        .hero img { max-width: 600px; border-radius: 8px; box-shadow: 0 10px 30px rgba(0,0,0,0.3); }
        .container { padding: 2rem 5%; max-width: 1200px; margin: auto; }
        .grid { display: grid; grid-template-columns: repeat(auto-fit, minmax(280px, 1fr)); gap: 20px; }
        .card { border: 1px solid #ddd; padding: 1rem; border-radius: 8px; transition: 0.3s; }
        .card:hover { box-shadow: 0 5px 15px rgba(0,0,0,0.1); }
        .card img { width: 100%; height: 200px; object-fit: cover; border-radius: 4px; }
        footer { background: var(--dark); color: white; text-align: center; padding: 2rem; margin-top: 2rem; }
        @media (max-width: 768px) { nav ul { flex-direction: column; gap: 5px; } }