app.js

const listEl = document.querySelector('.faq__list');

for (let i = 1; i < listEl.children.length; i++) {
  const boxEl = listEl.children[i].children[0];
  const textEl = listEl.children[i].children[1];

  let open = false;

  boxEl.addEventListener('click', () => {
    textEl.classList.toggle('hide');

    if (open) {
      boxEl.children[1].classList.toggle('rotate');
      boxEl.children[0].style.fontWeight = '400';
      open = false;
      return;
    }

    boxEl.children[1].classList.toggle('rotate');
    boxEl.children[0].style.fontWeight = '700';
    open = true;
  });
}

let desktop = false;
const boxImgEl = document.querySelector('.card__image--3');

window.addEventListener('resize', () => {
  if (window.innerWidth > '1440') {
    if (desktop) {
      return;
    }

    console.log('desktop');
    boxImgEl.classList.toggle('hide');
    desktop = true;
  } else if (window.innerWidth < '1440') {
    if (!desktop) {
      return;
    }

    console.log('mobile');
    boxImgEl.classList.toggle('hide');
    desktop = false;
  }
});