.backface-visibility(...) {
  -webkit-backface-visibility: @arguments;
  -moz-backface-visibility: @arguments;
  -o-backface-visibility: @arguments;
  -ms-backface-visibility: @arguments;
  backface-visibility: @arguments;
}

.box-shadow (@string) {
  -webkit-box-shadow: @string;
  -moz-box-shadow:    @string;
  box-shadow:         @string;
}

.fixed() {
  position: fixed;
  .backface-visibility(visible);
}

.rgba-color ( @color,  @x:0.6) {
  color: rgba(red(@color), green(@color), blue(@color), @x);
}

.rgba-bg-color (@color,  @x:0.6) {
  background-color: rgba(red(@color), green(@color), blue(@color), @x);
}

.rgba-box-shadow (@unit, @color,  @x:0.6) {
  -webkit-box-shadow: @unit rgba(red(@color), green(@color), blue(@color), @x);
  -moz-box-shadow: @unit rgba(red(@color), green(@color), blue(@color), @x);
  box-shadow: @unit rgba(red(@color), green(@color), blue(@color), @x);
}

.rgba-border (@color,  @x:0.6) {
  border-color: rgba(red(@color), green(@color), blue(@color), @x);
}

.placeholder(@color:#aaa, @element: 08121991) {
  .inception (@arguments) when not (@element = 08121991) {
    @{element}::-webkit-input-placeholder {
      color: @color;
    }
    @{element}:-moz-placeholder {
      color: @color;
    }
    @{element}::-moz-placeholder {
      color: @color;
    }
    @{element}:-ms-input-placeholder {
      color: @color;
    }
  }
  .inception (@arguments) when (@element = 08121991) {
    &::-webkit-input-placeholder {
      color: @color;
    }
    &:-moz-placeholder {
      color: @color;
    }
    &::-moz-placeholder {
      color: @color;
    }
    &:-ms-input-placeholder {
      color: @color;
    }
  }
  .inception(@arguments);
}

.border-radius (@radius: 5px) {
  -webkit-border-radius: @radius;
  -moz-border-radius:    @radius;
  border-radius:         @radius;
}

.border-radiuses (@topright: 0, @bottomright: 0, @bottomleft: 0, @topleft: 0) {
  -webkit-border-top-right-radius:    @topright;
  -webkit-border-bottom-right-radius: @bottomright;
  -webkit-border-bottom-left-radius:  @bottomleft;
  -webkit-border-top-left-radius:     @topleft;

  -moz-border-radius-topright:        @topright;
  -moz-border-radius-bottomright:     @bottomright;
  -moz-border-radius-bottomleft:      @bottomleft;
  -moz-border-radius-topleft:         @topleft;

  border-top-right-radius:            @topright;
  border-bottom-right-radius:         @bottomright;
  border-bottom-left-radius:          @bottomleft;
  border-top-left-radius:             @topleft;
}


.transition (...) {
  -webkit-transition: @arguments;
  -moz-transition:    @arguments;
  -ms-transition:     @arguments;
  -o-transition:      @arguments;
  transition:         @arguments;
}
.display-flex() {
  display: -webkit-flex;
  display: -moz-flex;
  display: -ms-flex;
  display: flex;
}

.transition-delay(...) {
  -webkit-transition-delay: @arguments;
  -moz-transition-delay: @arguments;
  -o-transition-delay: @arguments;
  transition-delay: @arguments;
}

.transition-duration(...) {
  -webkit-transition-duration: @arguments;
  -moz-transition-duration: @arguments;
  -o-transition-duration: @arguments;
  transition-duration: @arguments;
}

.transition-property(...) {
  -webkit-transition-property: @arguments;
  -moz-transition-property: @arguments;
  -o-transition-property: @arguments;
  transition-property: @arguments;
}

.transition-timing-function(...) {
  -webkit-transition-timing-function: @arguments;
  -moz-transition-timing-function: @arguments;
  -o-transition-timing-function: @arguments;
  transition-timing-function: @arguments;
}

.transform(@string){
  -webkit-transform: @string;
  -moz-transform: 	 @string;
  -ms-transform: 	 @string;
  -o-transform: 	 @string;
  transform: 		 @string;
}

.transform-origin (@x:center, @y:center) {
  -webkit-transform-origin: @x @y;
  -moz-transform-origin:    @x @y;
  -ms-transform-origin:     @x @y;
  -o-transform-origin:      @x @y;
  transform-origin:         @x @y;
}

.transform-style(...) {
  -webkit-transform-style: @arguments;
  -moz-transform-style: @arguments;
  -ms-transform-style: @arguments;
  transform-style: @arguments;
}

.box-sizing (@type: border-box) {
  -webkit-box-sizing: @type;
  -moz-box-sizing:    @type;
  box-sizing:         @type;
}

.scale (@factor) {
  -webkit-transform: scale(@factor);
  -moz-transform: 	 scale(@factor);
  -ms-transform: 		 scale(@factor);
  -o-transform: 		 scale(@factor);
}
.rotate (@deg) {
  -webkit-transform: rotate(@deg);
  -moz-transform: 	 rotate(@deg);
  -ms-transform: 		 rotate(@deg);
  -o-transform: 		 rotate(@deg);
}

.skew (@deg, @deg2) {
  -webkit-transform:       skew(@deg, @deg2);
  -moz-transform: 	 skew(@deg, @deg2);
  -ms-transform: 		 skew(@deg, @deg2);
  -o-transform: 		 skew(@deg, @deg2);
}

.perspective (@value: 1000) {
  -webkit-perspective: 	@value;
  -moz-perspective: 	@value;
  -ms-perspective: 	@value;
  perspective: 		@value;
}

.translate (@x, @y:0) {
  -webkit-transform:       translate(@x, @y);
  -moz-transform: 	 translate(@x, @y);
  -ms-transform: 		 translate(@x, @y);
  -o-transform: 		 translate(@x, @y);
}

.translate3d (@x, @y: 0, @z: 0) {
  -webkit-transform:       translate3d(@x, @y, @z);
  -moz-transform: 	 translate3d(@x, @y, @z);
  -ms-transform: 		 translate3d(@x, @y, @z);
  -o-transform: 		 translate3d(@x, @y, @z);
}

.opacity (@opacity: 0.5) {
  -webkit-opacity: 	@opacity;
  -moz-opacity: 		@opacity;
  opacity: 		@opacity;
}

.text-shadow (@string: 0 1px 3px rgba(0, 0, 0, 0.25)) {
  text-shadow: @string;
}

.drop-shadow (@x: 0, @y: 1px, @blur: 2px, @spread: 0, @alpha: 0.25) {
  -webkit-box-shadow:	@x @y @blur @spread rgba(0, 0, 0, @alpha);
  -moz-box-shadow:	@x @y @blur @spread rgba(0, 0, 0, @alpha);
  box-shadow:		@x @y @blur @spread rgba(0, 0, 0, @alpha);
}

.inner-shadow (@x: 0, @y: 1px, @blur: 2px, @spread: 0, @alpha: 0.25) {
  -webkit-box-shadow: inset @x @y @blur @spread rgba(0, 0, 0, @alpha);
  -moz-box-shadow:    inset @x @y @blur @spread rgba(0, 0, 0, @alpha);
  box-shadow:         inset @x @y @blur @spread rgba(0, 0, 0, @alpha);
}

.animation (@name, @duration: 300ms, @delay: 0, @ease: ease) {
  -webkit-animation: @name @duration @delay @ease;
  -moz-animation:    @name @duration @delay @ease;
  -ms-animation:     @name @duration @delay @ease;
}
.user-select(@string) {
  -webkit-user-select: @string;
  -moz-user-select: @string;
  -ms-user-select: @string;
  user-select: @string;
}
.flex-flow(@type) {
  -webkit-flex-flow: @type;
  -moz-flex-flow: @type;
  -ms-flex-flow: @type;
  flex-flow: @type;
}

.align-items(@align) {
  -webkit-align-items: @align;
  -moz-align-items: @align;
  -ms-align-items: @align;
  -ms-flex-align: @align;
  align-items: @align;
}

.align-self(@align) {
  -webkit-align-self: @align;
  -moz-align-self: @align;
  -ms-align-self: @align;
  align-self: @align;
}
.justify-content(@justify) {
  -webkit-justify-content: @justify;
  -moz-justify-content: @justify;
  -ms-justify-content: @justify;
  justify-content: @justify;
}