app.js

$(function() {
	
	var header = $("#header"),
		introH = $("#intro").innerHeight(),
		scrollOffset = $(window).scrollTop();
		
	/* Fixed Header */
	checkScroll(scrollOffset);
	
	$(window).on("scroll", function(){
		scrollOffset = $(this).scrollTop();
		checkScroll(scrollOffset);
				
	});
	
	function checkScroll(scrollOffset){
		if(scrollOffset >= introH) {
			header.addClass("fixed");
		} else {
			header.removeClass("fixed");
		}
	}
	
	/* Smooth Scroll */
	
	$("[data-scroll]").on("click", function(event) {
		event.preventDefault();
		
		var $this = $(this);
			blockId = $(this).data('scroll'),
			blockOffset = $(blockId).offset().top;
			
			$("#nav a").removeClass("active");
			$this.addClass("active");
			
			$("html, body").animate({
				scrollTop: blockOffset
			}, 500);
	});
	
	/* Mobile Menu */
	
	$("#nav_toggle").on("click", function(event){
		event.preventDefault();
		
		$(this).toggleClass("active");
		$("#nav").toggleClass("active");
		
		
	})
	
	
	/* Accordion */

	$("[data-collapse]").on("click", function(event){
		event.preventDefault();
		
		var $this = $(this),
			blockId = $this.data('collapse');
			
		$this.toggleClass("active");
		
	})	
	
	/* Slider */
	
	$("[data-slider]").slick({
		infinite: true,
		fade: true,
		slidesToShow: 2,
		slidesToScroll: 2
	});
	
});