(function () {
  'use strict';

  var resourceNav = document.querySelector('.cbay-page-content .cbay-related');
  if (!resourceNav) return;

  var mobileQuery = window.matchMedia('(max-width: 950px)');

  function setNavigationMode(event) {
    if (event.matches) {
      resourceNav.removeAttribute('open');
    } else {
      resourceNav.setAttribute('open', '');
    }
  }

  setNavigationMode(mobileQuery);

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