@charset "utf-8";
/**
 * @module 背景与边框
 * @description 为元素添加边框(包括1px边框)
 * @method border
 * @version 2.0.0
 * @param {String} $border-width 指定边框厚度(单位为px),默认值:1px,取值与`border-width`属性一致,不同方向代表边框位置 <2.0.0>
 * @param {String} $border-color 指定边框颜色 <2.0.0>
 * @param {String} $border-style 指定边框样式 <2.0.0>
 * @param {String} $radius 指定边框圆角半径,默认值:null <2.0.0>
 */
@mixin border($border-width: 1px, $border-color: map-get($base, border-color), $border-style: solid, $radius: null) {
    // 为边框位置提供定位参考
    position: relative;
    @if $border-width == null {
        $border-width: 0;
    }
    border-radius: $radius;
    &::after {
        // 用以解决边框layer遮盖内容
        pointer-events: none;
        position: absolute;
        z-index: 999;
        top: 0;
        left: 0;
        // fix当元素宽度出现小数时,边框可能显示不全的问题
        // overflow: hidden;
        content: "\0020";
        border-color: $border-color;
        border-style: $border-style;
        border-width: $border-width;
        // 适配dpr进行缩放
        @include responsive(retina1x) {
            width: 100%;
            height: 100%;
            @if $radius != null {
                border-radius: $radius;
            }
        }
        @include responsive(retina2x) {
            width: 200%;
            height: 200%;
            @include transform(scale(.5));
            @if $radius != null {
                border-radius: $radius * 2;
            }
        }
        @include responsive(retina3x) {
            width: 300%;
            height: 300%;
            @include transform(scale(.33333));
            @if $radius != null {
                border-radius: $radius * 3;
            }
        }
        @include transform-origin(0 0);
    }
}