/* Responsive Design */
@media (max-width: 768px) {
    header h1 {
        font-size: 1.8rem;
    }
    nav ul {
        gap: 10px;
    }
    nav ul li a {
        padding: 5px;
    }
    .container {
        padding: 1rem 15px;
    }

    /* Stack category buttons vertically on mobile */
    #category-filters {
        flex-direction: column;
        align-items: center;
    }

    /* Make cert cards single column on mobile */
    .cert-container {
        grid-template-columns: 1fr;
    }

    /* Stack project cards completely */
    .project-card {
        padding: 15px;
        margin-bottom: 15px;
    }

    /* Adjust modal on mobile */
    .modal-content {
        width: 90%;
        margin: 20% auto;
        padding: 20px;
    }

    /* Smaller animation on mobile */
    .cert-card:hover {
        transform: none; /* Remove hover transform on mobile for better UX */
    }

    .project-card:hover {
        transform: none; /* Remove hover transform on mobile */
    }
}

@media (max-width: 480px) {
    header {
        padding: 0.5rem 0;
    }

    header h1 {
        font-size: 1.5rem;
    }

    header h2 {
        font-size: 0.9rem;
    }

    nav ul {
        gap: 5px;
        flex-wrap: wrap; /* Allow wrapping on very small screens */
    }

    nav ul li a {
        padding: 4px 8px;
        font-size: 0.9rem;
    }

    section {
        padding: 20px;
        margin: 1rem 0;
    }

    footer {
        padding: 1rem 0;
        margin-top: 1rem;
    }
}