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document.addEventListener('DOMContentLoaded', function() { var nav = document.getElementById('site-navigation'); if (!nav) return; var button = nav.querySelector('button.menu-toggle'); var menu = nav.querySelector('ul.nav-menu'); if (!button || !menu) return; // Menü auf- und zuklappen button.addEventListener('click', function() { menu.classList.toggle('toggled-on'); button.classList.toggle('toggled-on'); var expanded = button.getAttribute('aria-expanded') === 'true'; button.setAttribute('aria-expanded', !expanded); });