/* 配合 style/function/border 使用 */
@mixin border-radius-retina($radius) {
  border-radius: $radius;

  &::after {
    border-radius: calc($radius * 2) !important;
  }

  @media (-webkit-min-device-pixel-ratio: 3) {
    &::after {
      border-radius: calc($radius * 3) !important;
    }
  }

  @media (-webkit-min-device-pixel-ratio: 4) {
    &::after {
      border-radius: calc($radius * 4) !important;
    }
  }
}