(function () {
  var toggle = document.querySelector('.nav-toggle');
  var nav = document.getElementById('site-nav-menu');
  if (!toggle || !nav) return;

  toggle.addEventListener('click', function () {
    var isOpen = nav.classList.toggle('is-open');
    toggle.classList.toggle('is-open', isOpen);
    toggle.setAttribute('aria-expanded', isOpen ? 'true' : 'false');
  });
})();