psychic-ui/src/grid/grid.styl

the working mans css framework

.grid
    width: 100%

    &:after
        clear: both
        visibility: hidden
        display: block
        font-size: 0
        content: ' '
        height: 0

    > * > *
        word-wrap: break-word
        
    > div
        float: left
        box-sizing: border-box
        min-height: 1px

    for $i in (0..$grid-columns)
        > .col-{$i}-{$grid-columns}
            if($i == 0)
                display: none
            else
                width unit(($i / $grid-columns - $grid-gutter / 100 * 2) * 100, '%')
                margin-left: unit($grid-gutter, '%')
                margin-right: unit($grid-gutter, '%')

     for $name, $width in $breakpoints
        @media screen and (min-width: $width)
            for $i in (0..$grid-columns)
                > .col-{$name}-{$i}-{$grid-columns}
                    if($i == 0)
                        display: none
                    else
                        width: floor((100% / $grid-columns) * $i, 4)
                        margin-left: unit($grid-gutter, '%')
                        margin-right: unit($grid-gutter, '%')