$(document).ready(function() {

	// header scroll

	$(window).on('scroll', function() {

		var scroll = $(window).scrolltop();



		if (scroll >= 50) {

			$('#head').addclass('fixed');

		} else {

			$('#head').removeclass('fixed');

		}

	});




	// page scroll

	var sections = $('section')

		nav = $('nav[role="navigation"]');



	$(window).on('scroll', function () {

	  	var cur_pos = $(this).scrolltop();

	  	sections.each(function() {

	    	var top = $(this).offset().top - 76

	        	bottom = top + $(this).outerheight();

	    	if (cur_pos >= top && cur_pos <= bottom) {

	      		nav.find('a').removeclass('active');

	      		nav.find('a[href="#'+$(this).attr('id')+'"]').addclass('active');

	    	}

	  	});

	});



	

	

});