.border_radius(@radius:4px) {
-webkit-border-radius:@radius;
-moz-border-radius:@radius;
border-radius:@radius;
}

.border_radius_right(@radius:4px) {
-webkit-border-top-right-radius: @radius;
-webkit-border-bottom-right-radius: @radius;
-moz-border-radius-topright: @radius;
-moz-border-radius-bottomright: @radius;
border-top-right-radius: @radius;
border-bottom-right-radius: @radius;
}

.border_radius_left(@radius:4px) { 
-webkit-border-top-left-radius: @radius;
-webkit-border-bottom-left-radius: @radius;
-moz-border-radius-topleft: @radius;
-moz-border-radius-bottomleft: @radius;
border-top-left-radius: @radius;
border-bottom-left-radius: @radius;
}

.border_radius_bottom(@radius:4px) {
-webkit-border-bottom-left-radius: @radius;
-webkit-border-bottom-right-radius: @radius;
-moz-border-radius-bottomleft: @radius;
-moz-border-radius-bottomright: @radius;
border-bottom-left-radius: @radius;
border-bottom-right-radius: @radius;
}

.border_radius_top(@radius:4px) {
-webkit-border-top-left-radius: @radius;
-webkit-border-top-right-radius: @radius;
-moz-border-radius-topleft: @radius;
-moz-border-radius-topright: @radius;
border-top-left-radius: @radius;
border-top-right-radius: @radius;
}

.opacity(@opacity:0.75) { filter:~"alpha(opacity=@opacity * 100)"; -moz-opacity:@opacity; -khtml-opacity: @opacity; opacity: @opacity; }

.box_shadow(@shadow_x:3px, @shadow_y:3px, @shadow_rad:3px, @shadow_in:3px, @shadow_color:#888) {
box-shadow:@shadow_x @shadow_y @shadow_rad @shadow_in @shadow_color;
-webkit-box-shadow:@shadow_x @shadow_y @shadow_rad @shadow_in @shadow_color;
-moz-box-shadow:@shadow_x @shadow_y @shadow_rad @shadow_in @shadow_color;
}

.inset_box_shadow(@shadow_x:3px, @shadow_y:3px, @shadow_rad:3px, @shadow_in:3px, @shadow_color:#888) {
box-shadow:inset @shadow_x @shadow_y @shadow_rad @shadow_in @shadow_color;
-webkit-box-shadow:inset @shadow_x @shadow_y @shadow_rad @shadow_in @shadow_color;
-moz-box-shadow:inset @shadow_x @shadow_y @shadow_rad @shadow_in @shadow_color;
}

.text_shadow(@shadow_x:3px, @shadow_y:3px, @shadow_rad:3px, @shadow_color:#fff) {
text-shadow:@shadow_x @shadow_y @shadow_rad @shadow_color;
}

.vertical_gradient(@from: #000, @to: #FFF) {
background: @from;
background: -webkit-gradient(linear, left top, left bottom, from(@from), to(@to));
background: -webkit-linear-gradient(@from, @to);
background: -moz-linear-gradient(center top, @from 0%, @to 100%);
background: -moz-gradient(center top, @from 0%, @to 100%);
}

.transition(@selector:all, @animation:ease-in-out, @duration:.2s) {
    -webkit-transition:@selector @animation @duration;
    -moz-transition:@selector @animation @duration;
    -o-transition:@selector @animation @duration;
    transition:@selector @animation @duration;
}
.borderbox () {
-webkit-box-sizing: border-box;
-moz-box-sizing: border-box;
box-sizing: border-box;
}

.clearfix() {
	&:after {
		content:"";
		display:block;
		clear:both;
	}
}