.mobile-menu {
    transform: translateX(-100%);
    transition: transform 0.3s ease-in-out;
}
.mobile-menu.open {
    transform: translateX(0);
}
.overlay {
    opacity: 0;
    visibility: hidden;
    transition: opacity 0.3s ease-in-out, visibility 0.3s ease-in-out;
}
.overlay.open {
    opacity: 1;
    visibility: visible;
}