script.js

const btnMenu = document.querySelector("#btnMenu");
const menu = document.querySelector("#menu");
btnMenu.addEventListener("click", function () {
  menu.classList.toggle("mostrar");
});

const subMenuBtn = document.querySelectorAll(".submenu-btn");
for (let i = 0; i < subMenuBtn.length; i++) {
  subMenuBtn[i].addEventListener("click", function () {
    if (window.innerWidth < 1024) {
      const subMenu = this.nextElementSibling;
      const height = subMenu.scrollHeight;
      if (subMenu.classList.contains("desplegar")) {
        subMenu.classList.remove("desplegar");
        subMenu.removeAttribute("style");
      } else {
        subMenu.classList.add("desplegar");
        subMenu.style.height = height + "px";
      }
    }
  });
}