:root {
        --primary: #003171;
        --secondary: #0288d1;
        --dark: #222;
        --light: #f4f4f4;
        --accent: #26a67c;
        --text: #333;
    }
    * { box-sizing: border-box; margin: 0; padding: 0; }
    body { font-family: 'Roboto', Arial, sans-serif; color: var(--text); line-height: 1.6; background-color: #eee; }
    
    header { background: var(--primary); color: white; padding: 20px; text-align: center; }
    .nav-menu { display: flex; justify-content: center; gap: 20px; padding: 15px; background: #fff; list-style: none; border-bottom: 3px solid var(--secondary); }
    .nav-menu a { text-decoration: none; color: var(--primary); font-weight: bold; }

    .container { max-width: 1100px; margin: 20px auto; display: flex; flex-wrap: wrap; gap: 20px; padding: 0 10px; }
    .content { flex: 3; min-width: 300px; }
    .sidebar { flex: 1; min-width: 250px; }

    .card { background: white; padding: 15px; margin-bottom: 20px; border-radius: 4px; box-shadow: 0 2px 5px rgba(0,0,0,0.1); }
    .car-grid { display: grid; grid-template-columns: repeat(auto-fill, minmax(280px, 1fr)); gap: 15px; }
    .car-card { background: white; border-radius: 8px; overflow: hidden; border: 1px solid #ddd; display: flex; flex-direction: column; }
    .car-card img { width: 100%; height: 180px; object-fit: cover; }
    .car-info { padding: 10px; }
    .price { color: var(--primary); font-weight: bold; font-size: 1.2rem; }

    footer { background: var(--dark); color: white; text-align: center; padding: 20px; margin-top: 40px; font-size: 0.8rem; }
    
    @media (max-width: 768px) { .container { flex-direction: column; } }