No menu default on mobile

js/menu-toggle.js

@@ -2,16 +2,16 @@
 document.addEventListener('DOMContentLoaded', function() {
   const btn = document.querySelector('#menu-toggle');
   const menu = document.querySelector('.layout-menus');
-
   const menuState = localStorage.getItem('menuHidden');
-if (menuState === 'true') {
+  const isMobile = window.innerWidth < 768;
+
+if (menuState === 'true' || (menuState === null && isMobile)) {
   menu.classList.add('u-hidden');
 }
 
   if (btn && menu) {
     btn.addEventListener('click', function() {
       menu.classList.toggle('u-hidden');
-
       const isHidden = menu.classList.contains('u-hidden');
       localStorage.setItem('menuHidden', isHidden);
     });