/* RESPONSIVE BREAKPOINTS */
.desktop-only { display: flex; }
.mobile-only { display: none; }

@media (max-width: 992px) {
    .profile-grid, .contact-grid {
        grid-template-columns: 1fr;
    }
}

@media (max-width: 768px) {
    .desktop-only { display: none !important; }
    .mobile-only { display: flex !important; }

    .hud-header {
        top: 10px;
        width: 95%;
        padding: 0 16px;
    }

    #app-container {
        padding-top: 90px;
        padding-bottom: 90px;
    }

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

    .lab-stats-grid {
        grid-template-columns: 1fr;
        gap: 15px;
    }

    /* Mobile Bottom Navigation HUD */
    .mobile-bottom-nav {
        position: fixed;
        bottom: 12px;
        left: 50%;
        transform: translateX(-50%);
        width: 92%;
        height: 60px;
        background: var(--bg-card);
        backdrop-filter: blur(16px);
        -webkit-backdrop-filter: blur(16px);
        border: 1px solid var(--border-glass);
        border-radius: 20px;
        z-index: 1000;
        justify-content: space-around;
        align-items: center;
        box-shadow: 0 10px 25px rgba(0, 0, 0, 0.5);
    }

    .mobile-nav-item {
        display: flex;
        flex-direction: column;
        align-items: center;
        gap: 4px;
        color: var(--text-muted);
        text-decoration: none;
        font-size: 0.65rem;
        font-family: var(--font-heading);
    }

    .mobile-nav-item i {
        font-size: 1.1rem;
    }

    .mobile-nav-item.active {
        color: var(--accent-cyan);
        text-shadow: 0 0 8px var(--accent-cyan);
    }
}