.gradient(@color: #F5F5F5, @start: #EEE, @stop: #FFF) {
	background: @color;
	background: -webkit-gradient(linear, left bottom, left top, color-stop(0, @start), color-stop(1, @stop));
	background: -ms-linear-gradient(bottom,@start,@stop);
	background: -moz-linear-gradient(center bottom,@start 0%,@stop 100%);
	background: -o-linear-gradient(@stop,@start);
	filter: e(%("progid:DXImageTransform.Microsoft.gradient(startColorstr='%d', endColorstr='%d', GradientType=0)", @stop, @start));
}

.bw-gradient(@color: #F5F5F5, @start: 0, @stop: 255) {
	background: @color;
	background: -webkit-gradient(linear, left bottom, left top, color-stop(0, rgb(@start,@start,@start)), color-stop(1, rgb(@stop,@stop,@stop)));
	background: -ms-linear-gradient(bottom, rgb(@start,@start,@start) 0%, rgb(@stop,@stop,@stop) 100%);
	background: -moz-linear-gradient(center bottom, rgb(@start,@start,@start) 0%, rgb(@stop,@stop,@stop) 100%);
	background: -o-linear-gradient(rgb(@stop,@stop,@stop), rgb(@start,@start,@start));
	background: linear-gradient(rgb(@stop,@stop,@stop), rgb(@start,@start,@start));

	filter: e(%("progid:DXImageTransform.Microsoft.gradient(startColorstr='%d', endColorstr='%d', GradientType=0)",rgb(@stop,@stop,@stop), rgb(@start,@start,@start)));
}

.linear-gradient(@color, @gradient) {
	background: @color;
	background: -moz-linear-gradient(@gradient);
	background: -webkit-linear-gradient(@gradient);
	background: -o-linear-gradient(@gradient);
	background: -ms-linear-gradient(@gradient);
	background: linear-gradient(@gradient);
}

.bordered(@top-color: #EEE, @right-color: #EEE, @bottom-color: #EEE, @left-color: #EEE) {
	border-top: solid 1px @top-color;
	border-left: solid 1px @left-color;
	border-right: solid 1px @right-color;
	border-bottom: solid 1px @bottom-color;
}

.drop-shadow(@x-axis: 0, @y-axis: 1px, @blur: 2px, @alpha: 0.1) {
	-webkit-box-shadow: @x-axis @y-axis @blur rgba(0, 0, 0, @alpha);
	-moz-box-shadow: @x-axis @y-axis @blur rgba(0, 0, 0, @alpha);
	box-shadow: @x-axis @y-axis @blur rgba(0, 0, 0, @alpha);
}

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

.rounded(@radius: 2px) {
	-webkit-border-radius: @radius;
	-moz-border-radius: @radius;
	border-radius: @radius;
}

.border-radius(@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;
	.background-clip(padding-box);
}

.opacity(@opacity: 0.5) {
	-moz-opacity: @opacity;
	-webkit-opacity: @opacity;
	opacity: @opacity;
	@opperc: @opacity * 100;
	-ms-filter: ~"progid:DXImageTransform.Microsoft.Alpha(opacity=@{opperc})";
	filter: ~"alpha(opacity=@{opperc})";
}

.transition-duration(@duration: 0.2s) {
	-moz-transition-duration: @duration;
	-webkit-transition-duration: @duration;
	-o-transition-duration: @duration;
	transition-duration: @duration;
}

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

.rotation(@deg:5deg) {
	.transform(rotate(@deg));
}

.scale(@ratio:1.5) {
	.transform(scale(@ratio));
}

.transition(@duration:0.2s, @on: all, @ease:ease) {
	-webkit-transition: @on @duration @ease;
	-moz-transition: @on @duration @ease;
	-o-transition: @on @duration @ease;
	transition: @on @duration @ease;
}

.inner-shadow(@horizontal:0, @vertical:1px, @blur:2px, @alpha: 0.4) {
	-webkit-box-shadow: inset @horizontal @vertical @blur rgba(0, 0, 0, @alpha);
	-moz-box-shadow: inset @horizontal @vertical @blur rgba(0, 0, 0, @alpha);
	box-shadow: inset @horizontal @vertical @blur rgba(0, 0, 0, @alpha);
}

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

.user-select(@argument: none) {
	-webkit-user-select: @argument;
	-moz-user-select: @argument;
	-ms-user-select: @argument;
	user-select: @argument;
}

.columns(@colwidth: 250px, @colcount: 0, @colgap: 50px, @columnRuleColor: #EEE, @columnRuleStyle: solid, @columnRuleWidth: 1px) {
	-moz-column-width: @colwidth;
	-moz-column-count: @colcount;
	-moz-column-gap: @colgap;
	-moz-column-rule-color: @columnRuleColor;
	-moz-column-rule-style: @columnRuleStyle;
	-moz-column-rule-width: @columnRuleWidth;
	-webkit-column-width: @colwidth;
	-webkit-column-count: @colcount;
	-webkit-column-gap: @colgap;
	-webkit-column-rule-color: @columnRuleColor;
	-webkit-column-rule-style: @columnRuleStyle;
	-webkit-column-rule-width: @columnRuleWidth;
	column-width: @colwidth;
	column-count: @colcount;
	column-gap: @colgap;
	column-rule-color: @columnRuleColor;
	column-rule-style: @columnRuleStyle;
	column-rule-width: @columnRuleWidth;
}

.translate(@x:0, @y:0) {
	.transform(translate(@x, @y));
}

.background-clip(@argument: padding-box) {
	-moz-background-clip: @argument;
	-webkit-background-clip: @argument;
	background-clip: @argument;
}

.clearfix() {
	zoom: 1;
	&:before {
		content: '';
		display: block;
	}
	&:after {
		content: '';
		display: table;
		clear: both;
	}
}

.button-style(@base_color, @bg_var: 3.5%, @border_darken: 18%, @border_var: 4%) {
	@gradient_start: darken(@base_color, @bg_var);
	@gradient_end: lighten(@base_color, @bg_var);

	@border_color: darken(@base_color, @border_darken);

	@border_top: lighten(@border_color, @border_var );
	@border_bottom: darken(@border_color, @border_var );

	.gradient(@base_color, @gradient_start, @gradient_end);
	.bordered(@border_top, @border_color, @border_bottom, @border_color);
}

.vantage-button() {
	padding: 12px 20px;
	.bordered(#d2d2d2, #c3c3c3, #9f9f9f, #c3c3c3);
	.gradient(#ffffff, #dfdfdf, #ffffff);
	.rounded(3px);
	font-size: 12px;
	font-weight: bold;
	color: #646464;

	.box-shadow(~"0 1px 1px rgba(0,0,0,0.125), inset 0 1px 0 rgba(255, 255, 255, 0.5)");
	width: auto;
	text-decoration: none;

	/* Improves usability and consistency of cursor style between image-type 'input' and others */
	cursor: pointer;

	/* Corrects inability to style clickable 'input' types in iOS */
	line-height: 1;
	text-shadow: 0 1px 0 rgba(255, 255, 255, 0.8);

	&:focus {
		/* Button hover style */
		.bordered(#dadada, #cfcfcf, #a8a8a8, #cfcfcf);
		.gradient(#ffffff, #ebebeb, #ffffff);
	}

	&:active {
		/* Button click style */
		.bordered(#aaa, #bbb, #bbb, #bbb);
		.box-shadow(~'inset 0 -1px 0 rgba(255, 255, 255, 0.5), inset 0 2px 5px rgba(0, 0, 0, 0.15)');
	}
}
