jQuery(document).ready(function($){
	var offset = 300,
		offset_opacity = 1200,
		scroll_top_duration = 700,
		$back_to_top = $('.go-back');
	$(window).scroll(function(){
		( $(this).scrollTop() > offset ) ? $back_to_top.addClass('is-visible') : $back_to_top.removeClass('is-visible fade-out');
		if( $(this).scrollTop() > offset_opacity ) { 
			$back_to_top.addClass('fade-out');
		}
	});

	//smooth scroll to top
	$back_to_top.on('click', function(event){
		event.preventDefault();
		$('body,html').animate({
			scrollTop: 0 ,
		 	}, scroll_top_duration
		);
	});

});

//initialize foundation
jQuery(document).ready(function($){
jQuery(document).foundation();
});