// Gradients

#gradient {
  // Horizontal gradient, from left to right
  //
  // Creates two color stops, start and end, by specifying a color and position for each color stop.
  // Color stops are not available in IE9 and below.
  .horizontal(@start-color: #555; @end-color: #333; @start-percent: 0%; @end-percent: 100%) {
    background-image: -webkit-linear-gradient(
      left,
      @start-color @start-percent,
      @end-color @end-percent
    ); // Safari 5.1-6, Chrome 10+

    background-image: -o-linear-gradient(left, @start-color @start-percent, @end-color @end-percent); // Opera 12
    background-image: linear-gradient(
      to right,
      @start-color @start-percent,
      @end-color @end-percent
    ); // Standard, IE10, Firefox 16+, Opera 12.10+, Safari 7+, Chrome 26+

    background-repeat: repeat-x;
    filter: e(
      %(
        "progid:DXImageTransform.Microsoft.gradient(startColorstr='%d', endColorstr='%d', GradientType=1)",
        argb(@start-color),
        argb(@end-color)
      )
    ); // IE9 and down
  }

  // Vertical gradient, from top to bottom
  //
  // Creates two color stops, start and end, by specifying a color and position for each color stop.
  // Color stops are not available in IE9 and below.
  .vertical(@start-color: #555; @end-color: #333; @start-percent: 0%; @end-percent: 100%) {
    background-image: -webkit-linear-gradient(
      top,
      @start-color @start-percent,
      @end-color @end-percent
    ); // Safari 5.1-6, Chrome 10+

    background-image: -o-linear-gradient(top, @start-color @start-percent, @end-color @end-percent); // Opera 12
    background-image: linear-gradient(
      to bottom,
      @start-color @start-percent,
      @end-color @end-percent
    ); // Standard, IE10, Firefox 16+, Opera 12.10+, Safari 7+, Chrome 26+

    background-repeat: repeat-x;
    filter: e(
      %(
        "progid:DXImageTransform.Microsoft.gradient(startColorstr='%d', endColorstr='%d', GradientType=0)",
        argb(@start-color),
        argb(@end-color)
      )
    ); // IE9 and down
  }

  .directional(@start-color: #555; @end-color: #333; @deg: 45deg) {
    background-image: -webkit-linear-gradient(@deg, @start-color, @end-color); // Safari 5.1-6, Chrome 10+
    background-image: -o-linear-gradient(@deg, @start-color, @end-color); // Opera 12
    background-image: linear-gradient(
      @deg,
      @start-color,
      @end-color
    ); // Standard, IE10, Firefox 16+, Opera 12.10+, Safari 7+, Chrome 26+

    background-repeat: repeat-x;
  }

  .horizontal-three-colors(@start-color: #00b3ee; @mid-color: #7a43b6; @color-stop: 50%; @end-color: #c3325f) {
    background-image: -webkit-linear-gradient(left, @start-color, @mid-color @color-stop, @end-color);
    background-image: -o-linear-gradient(left, @start-color, @mid-color @color-stop, @end-color);
    background-image: linear-gradient(to right, @start-color, @mid-color @color-stop, @end-color);
    background-repeat: no-repeat;
    filter: e(
      %(
        "progid:DXImageTransform.Microsoft.gradient(startColorstr='%d', endColorstr='%d', GradientType=1)",
        argb(@start-color),
        argb(@end-color)
      )
    ); // IE9 and down, gets no color-stop at all for proper fallback
  }

  .vertical-three-colors(@start-color: #00b3ee; @mid-color: #7a43b6; @color-stop: 50%; @end-color: #c3325f) {
    background-image: -webkit-linear-gradient(@start-color, @mid-color @color-stop, @end-color);
    background-image: -o-linear-gradient(@start-color, @mid-color @color-stop, @end-color);
    background-image: linear-gradient(@start-color, @mid-color @color-stop, @end-color);
    background-repeat: no-repeat;
    filter: e(
      %(
        "progid:DXImageTransform.Microsoft.gradient(startColorstr='%d', endColorstr='%d', GradientType=0)",
        argb(@start-color),
        argb(@end-color)
      )
    ); // IE9 and down, gets no color-stop at all for proper fallback
  }

  .radial(@inner-color: #555; @outer-color: #333) {
    background-image: -webkit-radial-gradient(circle, @inner-color, @outer-color);
    background-image: radial-gradient(circle, @inner-color, @outer-color);
    background-repeat: no-repeat;
  }

  .striped(@color: rgba(255,255,255,0.15); @angle: 45deg) {
    background-image: -webkit-linear-gradient(
      @angle,
      @color 25%,
      transparent 25%,
      transparent 50%,
      @color 50%,
      @color 75%,
      transparent 75%,
      transparent
    );
    background-image: -o-linear-gradient(
      @angle,
      @color 25%,
      transparent 25%,
      transparent 50%,
      @color 50%,
      @color 75%,
      transparent 75%,
      transparent
    );
    background-image: linear-gradient(
      @angle,
      @color 25%,
      transparent 25%,
      transparent 50%,
      @color 50%,
      @color 75%,
      transparent 75%,
      transparent
    );
  }
}