// Navigation Scripts to Show Header on Scroll-Up
jQuery(document).ready(function($) {
    var MQL = 1170;

    //primary navigation slide-in effect
    if ($(window).width() > MQL) {
	var headerHeight = $('.navbar-custom').height();
	$(window).on('scroll', {
	    previousTop: 0
	},
		     function() {
			 var currentTop = $(window).scrollTop();
			 //check if user is scrolling up
			 if (currentTop < this.previousTop) {
			     //if scrolling up...
			     if (currentTop > 0 && $('.navbar-custom').hasClass('is-fixed')) {
				 $('.navbar-custom').addClass('is-visible');
			     } else {
				 $('.navbar-custom').removeClass('is-visible is-fixed');
			     }
			 } else {
			     //if scrolling down...
			     $('.navbar-custom').removeClass('is-visible');
			     if (currentTop > headerHeight && !$('.navbar-custom').hasClass('is-fixed')) $('.navbar-custom').addClass('is-fixed');
			 }
			 this.previousTop = currentTop;
		     });
    }
});
