.portfolio-section {
    padding-bottom: 40px;
}


/* category filter */

.filter-section {
    padding-top: 40px;
}


.filter-container {
    text-align: center;
    padding: 20px
}


ul.filter > li > a {
    color: #1abc9c;
    font-size: 20px;
    line-height: 40px
}

    ul.filter > li > a:hover, ul.filter > li > a:focus {
        text-decoration: none;
        color: #16a085;
        outline: none
    }

ul.filter > li.active a {
    color: #111
}

ul.filter > li span {
    color: #ddd;
    font-size: 20px;
    display: inline-block;
    margin: 0 5px
}

.filter-section .filter-container .filter > li {
    padding: 0;
    margin: 0
}

.filter-section h1 {
    text-align: center
}


/* the color of the transparent overlay border */

.portfolio-section.port-col figure .overlay-background {
    background-color: #000;
    background-color: rgba(0,0,0,0.4);
}


/* portfolio images */

.portfolio-section figure {
    float: left;
    width: 100%;
    position: relative
}

    .portfolio-section figure img {
        width: 100%;
        height: auto
    }


/* project title under image */

.portfolio-section .article-title {
    text-align: center;
    float: left;
    width: 100%;
    font-size: 18px;
    line-height: 24px;
    padding: 10px 0 30px 0;
}

    .portfolio-section .article-title a {
        color: #aaa
    }


/* transparent overlay */

.portfolio-section figure:hover .overlay {
    opacity: 1;
    visibility: visible
}

.portfolio-section figure:hover .overlay-background {
    opacity: .8;
    visibility: visible
}

.portfolio-section figure .overlay-background {
    z-index: 1;
    -webkit-transition: all .2s ease-in-out;
    -moz-transition: all .2s ease-in-out;
    -o-transition: all .2s ease-in-out;
    transition: all .2s ease-in-out;
    position: absolute;
    top: 0;
    left: 0;
    opacity: 0;
    visibility: hidden;
    width: 100%;
    height: 100%
}

    .portfolio-section figure .overlay-background .inner {
        position: absolute;
        left: 0;
        right: 0;
        bottom: 0;
        top: 0;
        margin: 11px;
        background-color: #c8e9c8;
        background-color: rgba(194,231,194,0.9)
    }

.portfolio-section figure .overlay {
    z-index: 2;
    transition: all .2s ease-in-out;
    position: absolute;
    top: 0;
    left: 0;
    opacity: 0;
    visibility: hidden;
    width: 100%;
    height: 100%
}

.portfolio-section figure .inner-overlay {
    display: table;
    width: 100%;
    height: 100%
}

.portfolio-section figure .inner-overlay-content {
    display: table-cell;
    vertical-align: middle;
    width: 100%;
    padding: 20px 40px
}

    .portfolio-section figure .inner-overlay-content.with-icons {
        text-align: center
    }


        /* icons inside overlay */

        .portfolio-section figure .inner-overlay-content.with-icons a {
            width: 40px;
            height: 40px;
            line-height: 42px;
            display: inline-block;
            margin: 0 10px;
            text-decoration: none;
            font-size: 20px;
            background: rgba(0,0,0,0.9);
            color: #fff;
            border-radius: 0
        }


/* skew image on hover */

.isotopeSelector img {
    -webkit-transition: all .4s ease;
    -moz-transition: all .4s ease;
    -ms-transition: all .4s ease;
    -o-transition: all .4s ease;
    transition: all .4s ease
}

.isotopeSelector:hover img {
    -moz-transform: scale(1.5) rotate(2deg);
    -webkit-transform: scale(1.5) rotate(2deg);
    -o-transform: scale(1.5) rotate(2deg);
    -ms-transform: scale(1.5) rotate(2deg);
    transform: scale(1.5) rotate(2deg);
    -webkit-transition: all .8s ease;
    -moz-transition: all .8s ease;
    -ms-transition: all .8s ease;
    -o-transition: all .8s ease;
    transition: all .8s ease
}

.isotopeSelector figure {
    overflow: hidden
}

.isotopeSelector figure {
    box-shadow: 0 0 2px rgba(0,0,0,0.2)
}