/* Responsive Design */
@media (max-width: 768px) {
    nav .nav-container {
        padding: 0 1rem;
    }

    .mobile-menu {
        display: flex;
    }

    nav ul {
        position: absolute;
        top: 100%;
        left: 0;
        width: 100%;
        background: rgba(10, 10, 10, 0.98);
        backdrop-filter: blur(20px);
        flex-direction: column;
        padding: 20px 0;
        transform: translateY(-100%);
        opacity: 0;
        visibility: hidden;
        transition: all 0.3s ease;
    }

    nav ul.active {
        transform: translateY(0);
        opacity: 1;
        visibility: visible;
    }

    nav ul li {
        width: 100%;
        text-align: center;
    }

    nav ul li a {
        padding: 15px 20px;
        border-bottom: 1px solid rgba(255, 255, 255, 0.1);
    }

    nav ul li:last-child a {
        border-bottom: none;
    }

    .about-content {
        grid-template-columns: 1fr;
        gap: 40px;
        text-align: center;
    }

    .contact-container {
        grid-template-columns: 1fr;
        gap: 40px;
    }

    .projects-grid {
        grid-template-columns: 1fr;
    }

    .skills-grid {
        grid-template-columns: repeat(auto-fit, minmax(120px, 1fr));
    }

    .resume-grid {
        grid-template-columns: 1fr;
        gap: 40px;
    }

    .resume-item {
        flex-direction: column;
        gap: 15px;
    }

    .resume-item::before {
        display: none;
    }

    .resume-year {
        width: fit-content;
    }

    .certifications-grid {
        grid-template-columns: 1fr;
    }
}