LESS Initial Setup

common.less

.no-border { border: 0 !important; }

.clearfix {
    content: '';
    clear: both;
    display: block;
}

.clearfixAfter() {
    &:after {
        content: '';
        clear: both;
        display: block;
    }
}

.clear(@n) {
    &:nth-child(@{n}n) { clear: right; }

    &:nth-child(@{n}n + 1) { clear: left; }
}

.clearAndWidth(@n) {
    width: calc(100%/@n);
    .clear(@n);
}

.verticalAlignParent {
    /* Internet Explorer 10 */
    display: -ms-flexbox;
    -ms-flex-pack: center;
    -ms-flex-align: center;
    /* Firefox */
    display: -moz-box;
    -moz-box-pack: center;
    -moz-box-align: center;
    /* Safari, Opera, and Chrome */
    display: -webkit-box;
    -webkit-box-pack: center;
    -webkit-box-align: center;
    /* W3C */
    display: box;
    box-pack: center;
    box-align: center;
}

.gradient(@from, @to) { background: linear-gradient(to bottom, @from 0%, @from, 50%, @to 50%, @to 100%); }

.gradientDefault() { .gradient(#6B6C6E, #5E5F61); }

.gradientPrimary() { .gradient(#0B296E, #0B2369); }

.gradientInverted() { .gradient(#eaeaea, #ffffff); }

.transition(@type: all, @time: 333ms, @ease: ease-in-out) {
    -webkit-transition: @type @time @ease;
    -moz-transition: @type @time @ease;
    -o-transition: @type @time @ease;
    transition: @type @time @ease;
}

.absoluteFullsize {
    position: absolute;
    top: 0;
    left: 0;
    right: 0;
    bottom: 0;
}

.fixedFullsize {
    position: fixed;
    top: 0;
    left: 0;
    right: 0;
    bottom: 0;
}

.hidden { display: none; }

img.img-responsive {
    max-width: 100%;
    vertical-align: middle;
    text-align: center;
}

div.tooltip {
    background-color: #000;
    border: 1px solid #fff;
    padding: 10px;
    width: 200px;
    display: none;
    color: @fontColorPrimaryInverted;
    text-align: left;
    font-size: 11px;
    z-index: 200;
    -moz-box-shadow: 0 0 10px #000;
    -webkit-box-shadow: 0 0 10px #000;
}

#loading {
    display: block;
    border: 1px solid #ddd;
    -webkit-border-radius: 5px;
    -moz-border-radius: 5px;
    border-radius: 5px;
    width: 25px;
    height: 25px;
    overflow: hidden;
    background: white url('/media/dsg/loader.gif') no-repeat center center;
    position: absolute;
    z-index: 2000;
}

.parallax { overflow: hidden; }

index.html

<!-- On-the-fly LESS compiler - Client-side compiler -->
<script type="text/javascript">var less=less||{};less.env='development';</script>
<script src="http://cdnjs.cloudflare.com/ajax/libs/less.js/2.5.1/less.min.js"></script>

vars.less

@desktop: ~"screen and (min-width: 1200px)";
@hybrid	: ~"screen and (min-width: 992px)";
@tablet	: ~"screen and (min-width: 768px)";
@phone	: ~"screen and (max-width: 767px)";
@pocket	: ~"screen and (max-width: 480px)";