$border-utilities: (

"width":
  map-collect(
    map-deep-get($system-properties, border-width, standard),
    map-deep-get($system-properties, border-width, extended)
  ),
"style":
  map-collect(
    map-deep-get($system-properties, border-style, standard),
    map-deep-get($system-properties, border-style, extended)
  ),

);

@mixin border-n($side, $value…) {

$important: null;
@if has-important($value) {
  $value: remove($value, "!important");
  $important: " !important";
}
$has-style: false;
$widths: map-get($border-utilities, "width");

@each $this-value in $value {
  $match: false;
  @if map-has-key($all-color-shortcodes, smart-quote($this-value)) {
    $match: true;
    $this-value: smart-quote($this-value);
    @if $side == n {
      border-color: color($this-value) #{$important};
    } @else if $side == x {
      border-left-color: color($this-value) #{$important};
      border-right-color: color($this-value) #{$important};
    } @else if $side == y {
      border-bottom-color: color($this-value) #{$important};
      border-top-color: color($this-value) #{$important};
    } @else {
      border-#{$side}-color: color($this-value) #{$important};
    }
  } @else if type-of($this-value) == "number" {
    $converted-value: number-to-token($this-value);
    @if map-has-key($widths, $converted-value) {
      $match: true;
      $final-value: map-get($widths, $converted-value);
      @if $side == n {
        border-width: unquote("#{$final-value}#{$important}");
      } @else if $side == x {
        border-left-width: unquote("#{$final-value}#{$important}");
        border-right-width: unquote("#{$final-value}#{$important}");
      } @else if $side == y {
        border-bottom-width: unquote("#{$final-value}#{$important}");
        border-top-width: unquote("#{$final-value}#{$important}");
      } @else {
        border-#{$side}-width: unquote("#{$final-value}#{$important}");
      }
    } @else {
      @error '#{$this-value} is not a valid border width. Accepted values: #{map-keys($widths)}';
    }
  } @else if map-has-key($widths, smart-quote($this-value)) {
    $match: true;
    $this-value: smart-quote($this-value);
    $final-value: map-get($widths, $this-value);
    @if $side == n {
      border-width: unquote("#{$final-value}#{$important}");
    } @else if $side == x {
      border-left-width: unquote("#{$final-value}#{$important}");
      border-right-width: unquote("#{$final-value}#{$important}");
    } @else if $side == y {
      border-bottom-width: unquote("#{$final-value}#{$important}");
      border-top-width: unquote("#{$final-value}#{$important}");
    } @else {
      border-#{$side}-width: unquote("#{$final-value}#{$important}");
    }
  } @else {
    $converted-value: smart-quote($this-value);
    $styles: map-get($border-utilities, "style");
    @if map-has-key($styles, $converted-value) {
      $match: true;
      $has-style: true;
      $final-value: map-get($styles, $converted-value);
      @if $side == n {
        border-style: unquote("#{$final-value}#{$important}");
      } @else if $side == x {
        border-left-style: unquote("#{$final-value}#{$important}");
        border-right-style: unquote("#{$final-value}#{$important}");
      } @else if $side == y {
        border-bottom-style: unquote("#{$final-value}#{$important}");
        border-top-style: unquote("#{$final-value}#{$important}");
      } @else {
        border-#{$side}-style: unquote("#{$final-value}#{$important}");
      }
    } @else {
      @error '`#{$this-value}` is not a valid `border` token. '
        + 'Use valid color, units, and border-style tokens '
        + 'separated by commas.';
    }
  }
  @if not $match {
    @error '`#{$this-value}` is not a valid `border` token.';
  }
}
@if not $has-style {
  @if $side == n {
    border-style: solid#{$important};
  } @else if $side == x {
    border-left-style: solid#{$important};
    border-right-style: solid#{$important};
  } @else if $side == y {
    border-bottom-style: solid#{$important};
    border-top-style: solid#{$important};
  } @else {
    border-#{$side}-style: solid#{$important};
  }
}

}

@mixin u-border($value…) {

@include border-n(n, $value...);

}

@mixin u-border-x($value…) {

@include border-n(x, $value...);

}

@mixin u-border-y($value…) {

@include border-n(y, $value...);

}

@mixin u-border-top($value…) {

@include border-n(top, $value...);

}

@mixin u-border-right($value…) {

@include border-n(right, $value...);

}

@mixin u-border-bottom($value…) {

@include border-n(bottom, $value...);

}

@mixin u-border-left($value…) {

@include border-n(left, $value...);

}