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/* # Filterable portfolio
---------------------------------------------------------------------------------------------------- */

.post-type-archive-portfolio .archive-description{
    overflow: hidden;
}

ul.filter {
    color: #999;
    list-style: none;
    border-bottom: 1px solid rgba(0, 0, 0, 0.1);
}

ul.filter li {
    float: left;
}
ul.filter li:first-child {
  margin-left: 0;
}

ul.filter a {
    color: #555;
    display: block;
    padding: 0.5rem 1rem;
    text-decoration: none;
    border-bottom: none;
    font-size: 1.5rem;
    font-weight: 300;
    border-top: 4px solid #fff;
}

ul.filter a:hover, ul.filter a.active {
    border-top: 4px solid #3d91f0;
}

.filterable-portfolio {
    margin-left: -2rem;
    margin-left: -20px;
}

.portfolio-item {
    float: left;
    margin-bottom: 2rem;
    margin-bottom: 40px;
    margin-left: 2rem;
    margin-left: 20px;
    position: relative;
    width: 23%; 
}


.portfolio-item a img {
    display: block;
    margin-bottom: 0;
}

.portfolio-overlay {
    color: #fff;
    position: absolute;
    width: 100%;
    text-align: center;
    top: 0px;
    width: 100%;
    height: 100%;
    background-color: rgba(0,0,0,0.5);
    padding: 30px;
    opacity: 0;
    -webkit-transition: all 0.2s ease-in-out;
    -moz-transition: all 0.2s ease-in-out;
    -o-transition: all 0.2s ease-in-out;
    transition: all 0.2s ease-in-out;
}

.portfolio-item img:hover + .portfolio-overlay, .portfolio-overlay:hover {
    opacity: 1;
}

.portfolio-overlay h3 {
    font-weight: bold;
    margin: 0;
    width: 100%;
    padding: 5px 7px;
    text-transform: uppercase;
    color: #fff;
}

.clearfix{
    clear: both;
}

/*-----------------------------------------------------------------------------------*
/* = Isotope CSS Animations
/*-----------------------------------------------------------------------------------*/
.isotope, .isotope .isotope-item { -webkit-transition-duration: 0.6s; -moz-transition-duration: 0.6s; -ms-transition-duration: 0.6s; -o-transition-duration: 0.6s; transition-duration: 0.6s; }
.isotope { -webkit-transition-property: height, width; -moz-transition-property: height, width; -ms-transition-property: height, width; -o-transition-property: height, width; transition-property: height, width; }
.isotope .isotope-item { -webkit-transition-property: -webkit-transform, opacity; -moz-transition-property: -moz-transform, opacity; -ms-transition-property: -ms-transform, opacity; -o-transition-property: top, left, opacity; transition-property: transform, opacity; }
/**** disabling Isotope CSS3 transitions ****/
.isotope.no-transition, .isotope.no-transition .isotope-item, .isotope .isotope-item.no-transition { -webkit-transition-duration: 0s; -moz-transition-duration: 0s; -ms-transition-duration: 0s; -o-transition-duration: 0s; transition-duration: 0s; }

.filterable-portfolio-page .content .entry-header {
    margin-bottom: 1rem;
    margin-bottom: 10px;
}

.filterable-portfolio-page .content .entry-title {
    margin-bottom: 3rem;
    margin-bottom: 30px;
}

@media only screen and (max-width: 1179px) {
    .portfolio-item {
        width: 22%;
    }
}

@media only screen and (max-width: 1023px) {
    .portfolio-item {
        width: 30%;
    }
}
@media only screen and (max-width: 500px) {
    .portfolio-item {
        width: 100%;
    }
}

jQuery(function($){
    $(window).load(function() {
 
            /*main function*/
            function portfolioIsotope() {
                var $container = $('.portfolio-content');
                $container.isotope({
                    itemSelector: '.portfolio-item'
                });
            } portfolioIsotope();
 
            /*filter*/
            $('.filter a').click(function(){
              var selector = $(this).attr('data-filter');
                $('.portfolio-content').isotope({ filter: selector });
                $(this).parents('ul').find('a').removeClass('active');
                $(this).addClass('active');
              return false;
            });
 
            /*resize*/
            var isIE8 = $.browser.msie && +$.browser.version === 8;
            if (isIE8) {
                document.body.onresize = function () {
                    portfolioIsotope();
                };
            } else {
                $(window).resize(function () {
                    portfolioIsotope();
                });
            }
 
            // Orientation change
            window.addEventListener("orientationchange", function() {
                portfolioIsotope();
            });
 
    });
});

<?php
//* Do NOT include the opening php tag

//* Add Archive Settings option to Portolio CPT
add_post_type_support( 'portfolio', 'genesis-cpt-archives-settings' );
//* Define custom image size for Portfolio images in Portfolio archive
add_image_size( 'portfolio-image', 330, 230, true );

<?php
/**
 * Portfolio Archive
 * Author: James Roberts
 *
 */

// Force full width content (optional)
add_filter( 'genesis_pre_get_option_site_layout', '__genesis_return_full_width_content' );
//remove standard loop (optional)
remove_action( 'genesis_loop', 'genesis_do_loop' );
// Add our custom loop
add_action( 'genesis_loop', 'lp_filterable_portfolio' );

// Enqueue javascript
wp_enqueue_script('isotope', get_stylesheet_directory_uri() . '/js/isotope.pkgd.min.js', array('jquery'), '1.5.25', true);
wp_enqueue_script('isotope_init', get_stylesheet_directory_uri() . '/js/isotopes_init.js', array('isotope'), '', true);

/**
* Get Excerpt.
*
* @since 1.0
*
*/
function the_excerpt_max_charlength($charlength) {
	$excerpt = get_the_excerpt();
	$charlength++;

	if ( mb_strlen( $excerpt ) > $charlength ) {
		$subex = mb_substr( $excerpt, 0, $charlength - 5 );
		$exwords = explode( ' ', $subex );
		$excut = - ( mb_strlen( $exwords[ count( $exwords ) - 1 ] ) );
		if ( $excut < 0 ) {
			echo mb_substr( $subex, 0, $excut );
		} else {
			echo $subex;
		}
		echo '[...]';
	} else {
		echo $excerpt;
	}
}

/**
* Output filterable portfolio items.
*
* @since 1.0
*
*/
function lp_filterable_portfolio( ){
    
    $terms = get_terms( 'portfolio_category' );
    $count=0;
    ?>
 
    <div class="archive-description">
            <?php if( $terms ) { ?>
                <ul id="portfolio-cats" class="filter clearfix">
                    <li><a href="#" class="active" data-filter="*"><span><?php _e('All', 'lp'); ?></span></a></li>
                    <?php
                        foreach( $terms as $term ){
                            echo "<li><a href='#' data-filter='.$term->slug'><span>$term->name</span></a></li>";
                        }
                    ?>
                </ul><!-- /portfolio-cats --><br/><br/>
            <?php } ?>
     
             <?php if( have_posts() ) { ?>
                <div id="portfolio-wrap" class="clearfix filterable-portfolio">
                    <div class="portfolio-content">
                        <?php while( have_posts() ): the_post(); ?>
                            <?php $count++; ?>
                            <?php $terms = get_the_terms( get_the_ID(), 'portfolio_category' ); ?>
                            <?php if ( has_post_thumbnail($post->ID) ) { ?>
                                <article class="portfolio-item col-<?php echo $count; ?> <?php if( $terms ) foreach ( $terms as $term ) { echo $term->slug .' '; }; ?>">
                                    <a href="<?php the_permalink() ?>" rel="bookmark" title="<?php the_title_attribute(); ?>"><?php echo genesis_get_image( array( size => 'portfolio-image' ) ); ?>
                                    <div class="portfolio-overlay">
                                        <h3><?php the_title(); ?></h3>
                                        <p><?php the_excerpt_max_charlength(50);?></p>
                                    </div><!-- overlay --></a>
                                </article>
                            <?php } ?>
                        <?php endwhile; ?>
                    </div><!-- /themes-content -->
                </div><!-- /themes-wrap -->
            <?php } ?>
    </div>
 
<?php
    
}

genesis();