function toggleContextMenu(event, itemId) {
    event.stopPropagation();
    var menu = document.getElementById('menu-' + itemId);
    var wasOpen = menu.classList.contains('open');
    document.querySelectorAll('.context-menu').forEach(function(m) { m.classList.remove('open'); });
    if (!wasOpen) { menu.classList.add('open'); }
}
document.addEventListener('click', function(e) {
    document.querySelectorAll('.context-menu').forEach(function(m) { m.classList.remove('open'); });
});