// header background change on scroll 
$(document).on('scroll', function(){
    if ( $(window).scrollTop() > 80) {
        $('#header').addClass('change-bg');
    } else {
        $('#header').removeClass('change-bg');
    }
});

// section menu links active on scroll 
$(".section-menu-link").on("click", function (event) {
    event.preventDefault();
    var target = $($(this).attr("href"));
    if (target.length) {
      $("html, body").animate(
        {
          scrollTop: target.offset().top - 150,
        },
        500
      );
    }
});
$(window).on("scroll", function () {
    var scrollPos = $(document).scrollTop() + 150; // Adding 70px offset

    $(".section-content").each(function () {
        var currLink = $(this);
        var refElement = currLink.attr("id");
        if (
            currLink.position().top <= scrollPos &&
            currLink.position().top + currLink.height() > scrollPos
        ) {
            $(".section-menu-link").removeClass("active");
            $('.section-menu-link[href="#' + refElement + '"]').addClass("active");
        }
    });
});