// 响应列的水平位置偏移
@mixin make-offset-rtl() {
    @for $i from 1 through $grid-columns {
        .#{$css-prefix}col-offset-#{$i}[dir="rtl"] {
            margin-right: percentage($i / $grid-columns);
            margin-left: auto;
        }
    }
    @each $breakpoint in $breakpoints {
        $name: #{nth($breakpoint, 1)};
        @include breakpoint($name) {
            @for $j from 1 through $grid-columns {
                .#{$css-prefix}col-#{$name}-offset-#{$j}[dir="rtl"] {
                    margin-right: percentage($j / $grid-columns);
                    margin-left: auto;
                }
            }
        }
    }
}

// 固定列的水平位置偏移
@mixin make-offset-fixed-rtl() {
    @for $i from 1 through $grid-columns-fixed {
        .#{$css-prefix}col-offset-fixed-#{$i}[dir="rtl"] {
            margin-right: $i * $grid-col-fixed-width;
            margin-left: auto;
        }
    }
    @each $breakpoint in $breakpoints {
        $name: #{nth($breakpoint, 1)};
        @for $j from 1 through $grid-columns-fixed {
            .#{$css-prefix}col-offset-fixed-#{$name}-#{$j}[dir="rtl"] {
                margin-right: $j * $grid-col-fixed-width;
                margin-left: auto;
            }
        }
    }
}

@include make-offset-rtl();
@include make-offset-fixed-rtl();