document.addEventListener("DOMContentLoaded", function () {
  const menuBtn = document.querySelector(".nemccMenu");

  if (menuBtn) {
    menuBtn.addEventListener("click", function () {
      openNav(); // your existing function

      // toggle aria-expanded for accessibility
      const expanded = this.getAttribute("aria-expanded") === "true";
      this.setAttribute("aria-expanded", !expanded);
    });
  }
});