(function () {
  'use strict';

  var groups = Array.prototype.slice.call(document.querySelectorAll('.v570-footer-group'));
  if (!groups.length || !window.matchMedia) return;

  var desktop = window.matchMedia('(min-width: 721px)');

  function syncFooterGroups(event) {
    var isDesktop = typeof event.matches === 'boolean' ? event.matches : desktop.matches;
    groups.forEach(function (group) {
      group.open = isDesktop;
    });
  }

  syncFooterGroups(desktop);

  if (typeof desktop.addEventListener === 'function') {
    desktop.addEventListener('change', syncFooterGroups);
  } else if (typeof desktop.addListener === 'function') {
    desktop.addListener(syncFooterGroups);
  }
})();