/* Responsive */
@media (max-width: 768px) {
    h1 {
        font-size: 2.5em;
    }
    
    .contact-info {
        flex-direction: column;
        align-items: center;
    }
    
    .section {
        padding: 25px;
    }
    
    .skills-grid,
    .projects-grid,
    .certificates-grid {
        grid-template-columns: 1fr;
    }
}