about.js

const menuBtn = document.querySelector('.menu-btn');
const headerNavMobile = document.querySelector('.header-nav-mobile');
const btnCloseNav = document.querySelector('.btn-close-nav');
const linkHome = document.querySelector('.link-home');
const linkProgram = document.querySelector('.link-program');
const linkJoin = document.querySelector('.link-join');
const linkSponsor = document.querySelector('.link-sponsor');

menuBtn.addEventListener('click', () => {
  menuBtn.classList.add('hidden');
  headerNavMobile.classList.remove('hidden');
});

btnCloseNav.addEventListener('click', () => {
  menuBtn.classList.remove('hidden');
  headerNavMobile.classList.add('hidden');
});

linkHome.addEventListener('click', () => {
  headerNavMobile.classList.add('hidden');
  menuBtn.classList.remove('hidden');
});

linkProgram.addEventListener('click', () => {
  headerNavMobile.classList.add('hidden');
  menuBtn.classList.remove('hidden');
});

linkJoin.addEventListener('click', () => {
  headerNavMobile.classList.add('hidden');
  menuBtn.classList.remove('hidden');
});

linkSponsor.addEventListener('click', () => {
  headerNavMobile.classList.add('hidden');
  menuBtn.classList.remove('hidden');
});