script.js

    
    //colocando id do botão dentro da variavel
    const btnMobile = document.getElementById('btn-mobile');
       
        function toggleMenu(event) {
         
          if (event.type === 'touchstart') event.preventDefault();
         
          const nav = document.getElementById('nav');
          
          nav.classList.toggle('active');
          
          const active = nav.classList.contains('active');
          
          event.currentTarget.setAttribute('aria-expanded' , active);
          
          if (active) {
            event.currentTarget.setAttribute('aria-label' , 'Fechar Menu');
        
          } else {
            event.currentTarget.setAttribute('aria-label' , 'Abrir Menu');
          }
        }
        
        btnMobile.addEventListener('click' , toggleMenu);
        
        btnMobile.addEventListener('touchstart' , toggleMenu);