/* ============= RESPONSIVE DESIGN ============= */

@media (max-width: 1024px) {
    header {
        position: fixed;
        width: 100%;
        z-index: 1000;
    }

    .nav-menu {
        position: absolute;
        top: 100%;
        left: 0;
        right: 0;
        background: linear-gradient(135deg, var(--primary-color) 0%, var(--secondary-color) 100%);
        flex-direction: column;
        align-items: flex-start;
        padding: 1rem 1.5rem;
        display: none;
        gap: 0.5rem;
    }

    .nav-menu.active,
    .nav-menu.open {
        display: flex;
    }

    .nav-menu li,
    .nav-menu a {
        width: 100%;
    }

    .hamburger {
        display: flex;
        position: relative;
        z-index: 1001;
    }

    .hamburger.active span:nth-child(1) {
        transform: rotate(-45deg) translate(-5px, 6px);
    }

    .hamburger.active span:nth-child(2) {
        opacity: 0;
    }

    .hamburger.active span:nth-child(3) {
        transform: rotate(45deg) translate(-5px, -6px);
    }

    /* PI Member Responsive Design */
    .pi-member {
        flex-direction: column;
        gap: 2rem;
        min-height: auto;
        padding: 1.5rem;
        margin: 1rem 0;
    }

    .pi-member .member-info {
        flex: 1 1 100%;
        padding: 1rem;
        order: 1;
    }

    .pi-sidebar {
        flex: 0 0 100%;
        order: 2;
    }

    .pi-slider-wrapper {
        height: 300px;
    }

    .pi-interests {
        margin-top: 1rem;
    }
}

@media (max-width: 768px) {
    .pi-member {
        padding: 1rem;
        gap: 1.5rem;
    }

    .pi-slider-wrapper {
        height: 250px;
    }

    .member-name {
        font-size: 1.2rem;
    }

    .member-bio {
        font-size: 0.9rem;
    }
}

@media (max-width: 768px) {
    :root {
        --header-offset: 96px;
    }

    .hero {
        padding-top: 150px;
    }

    .hero h1 {
        font-size: 2rem;
    }

    .hero h2 {
        font-size: 1.2rem;
    }

    .hero p {
        font-size: 1rem;
    }

    .slider-controls {
        bottom: 30px;
    }

    .slider-btn {
        width: 40px;
        height: 40px;
        font-size: 1rem;
    }

    .slider-dots {
        bottom: 10px;
    }

    .about-grid,
    .contact-wrapper {
        grid-template-columns: 1fr;
    }

    .project-item,
    .project-item:nth-child(even) {
        grid-template-columns: 1fr;
        direction: ltr;
    }

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

    .team-grid::before {
        left: 0;
    }

    .team-member {
        grid-template-columns: 1fr;
        gap: 1.5rem;
        direction: ltr;
    }

    .team-member:nth-child(even) {
        direction: ltr;
    }

    .pi-member {
        display: block;
    }

    .pi-slider-wrapper {
        width: 100%;
        min-width: unset;
        max-width: unset;
        height: 220px;
        margin-top: 1rem;
    }

    .member-image {
        height: 250px;
        font-size: 3.5rem;
    }

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

    section {
        padding: 60px 1.5rem;
    }

    .section-title {
        font-size: 2rem;
    }
}