Preview:
    $('.tabs-nav a').on('click', function (event) {
        event.preventDefault();
        $('.tabs-nav li').removeClass('tab-active');
        $(this).parent().addClass('tab-active');
        $('.tabs-stage section').hide();
        $($(this).attr('href')).show();

        if ($('#tab-1').css('display') == 'none') {
            $('.box-filters').hide();
        } else {
            $('.box-filters').show();
        }
    });
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