//
// 网格
// ============================================================

// 列
=grid-class($class, $isNone)
    @for $i from 1 through $grid-columns
        @if $isNone != true
            @if $class == "xs"
                .col-#{$i}
                    width: percentage($i / $grid-columns)

                .col-offset-#{$i}
                    margin-left: percentage($i / $grid-columns)

            @else
                .col-#{$class}-#{$i}
                    width: percentage($i / $grid-columns)

                .col-#{$class}-offset-#{$i}
                    margin-left: percentage($i / $grid-columns)

        @else
            .col-#{$class}-#{$i}
                display: none