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(function () {
   var hamburger = $('.js-hamburger'),
      nav = $('.header__nav')
      var w = $(window).width();

   hamburger.on('click', function () {
      $(this).toggleClass('is-active');
      nav.slideToggle(500).toggleClass('is-active');
   });

   $(window).on('resize', function () {
      if (nav.hasClass('is-active')) {
         nav.removeClass('is-active');
      }
      if (hamburger.hasClass('is-active')) {
         hamburger.removeClass('is-active');
      }
      if(w > 320 && nav.is(':hidden')) {
            nav.removeAttr('style');
        }
   });
})();