@media (max-width: 768px) {
    header {
        padding: 10px;
    }
    
    nav a {
        display: inline-block;
        padding: 8px;
        font-size: 12px;
    }
    
    h1 {
        font-size: 32px;
    }
    
    section {
        padding: 20px;
    }
    
    .card {
        padding: 15px;
    }
}