(function() {
  var h = document.querySelector('.header');
  var s = document.querySelector('[data-section="hero"]');

  if (!s) {
    if (h) h.classList.add('has-background');
    return;
  }
  if (!h) return;

  function c() {
    if (h.classList.contains('header--submenu-open')) return;
    var r = s.getBoundingClientRect();
    var v = r.top < window.innerHeight && r.bottom > 0;
    v ? h.classList.remove('has-background') : h.classList.add('has-background');
  }

  c();

  var t = 0;
  window.addEventListener('scroll', function() {
    if (!t) {
      requestAnimationFrame(function() {
        c();
        t = 0;
      });
      t = 1;
    }
  });
  window.addEventListener('resize', c);
})();