// from http://css3please.com/
.box-round(@radius) {
	-webkit-border-radius: @radius; // Android ≤ 1.6, iOS 1-3.2, Safari 3-4
	border-radius: @radius; // Android 2.1+, Chrome, Firefox 4+, IE 9+, iOS 4+, Opera 10.50+, Safari 5+

	// useful if you don't want a bg color from leaking outside the border:
	background-clip: padding-box; // Android 2.2+, Chrome, Firefox 4+, IE 9+, iOS 4+, Opera 10.50+, Safari 4+
}

.unselectable() {
	-moz-user-select: -moz-none;
	-khtml-user-select: none;
	-webkit-user-select: none;
	-o-user-select: none;
	-ms-user-select: none;
	user-select: none;
}

.opacity(@value) {
	opacity: @value;
	filter: e(%("alpha(opacity=%s)", round(@value * 100))); // IE6-8
	zoom: 1; // IE 6-7 hasLayout hack
}

// from http://stackoverflow.com/a/12178019/323407
.fade-out-vertical(@backgroundColor: white) {
	@invisible: fadeout(@backgroundColor, 100%);
	background-image: -moz-linear-gradient(top, @invisible 0%, @backgroundColor 100%); // FF3.6+
	background-image: -webkit-gradient(linear, left top, left bottom, color-stop(0%, @invisible),
		color-stop(100%, @backgroundColor)); // Chrome,Safari4+
	background-image: -webkit-linear-gradient(top, @invisible 0%, @backgroundColor 100%); // Chrome10+,Safari5.1+
	background-image: -o-linear-gradient(top, @invisible 0%, @backgroundColor 100%); // Opera 11.10+
	background-image: linear-gradient(to bottom, @invisible 0%, @backgroundColor 100%); // W3C
	filter: e(%("progid:DXImageTransform.Microsoft.gradient( startColorstr='#%s', endColorstr='#%s',GradientType=0 )",
		rgbahex(@invisible), rgbahex(@backgroundColor))); // IE6-9
}
.fade-out-horizontal(@backgroundColor: white) {
	@invisible: fadeout(@backgroundColor, 100%);
	background-image: -moz-linear-gradient(left, @invisible 0%, @backgroundColor 100%); // FF3.6+
	background-image: -webkit-gradient(linear, left top, right top, color-stop(0%, @invisible),
		color-stop(100%, @backgroundColor)); // Chrome,Safari4+
	background-image: -webkit-linear-gradient(left, @invisible 0%, @backgroundColor 100%); // Chrome10+,Safari5.1+
	background-image: -o-linear-gradient(left, @invisible 0%, @backgroundColor 100%); // Opera 11.10+
	background-image: linear-gradient(to right, @invisible 0%, @backgroundColor 100%); // W3C
	filter: e(%("progid:DXImageTransform.Microsoft.gradient( startColorstr='#%s', endColorstr='#%s',GradientType=1 )",
		rgbahex(@invisible), rgbahex(@backgroundColor))); // IE6-9
}

.rotate(@degrees: 45deg) {
    -webkit-transform: rotate(@degrees);
    -moz-transform: rotate(@degrees);
    -ms-transform: rotate(@degrees);
    -o-transform: rotate(@degrees);
    transform: rotate(@degrees);

    filter: progid:DXImageTransform.Microsoft.BasicImage(rotation=(@degrees / 90.0));
	-ms-filter: "progid:DXImageTransform.Microsoft.BasicImage(rotation=(@degrees / 90.0))";

	// The filter rules (which are for IE < 9) cause a bug in IE 9 where the rotated
	// element will have a black background. So we have to disable them in IE9
	filter: none \0;
	-ms-filter: none \0;
}

// from http://pixelhunter.me/post/25782670606/css3-grayscale
.grayscale() {
	-webkit-filter: grayscale(100%);
	-moz-filter: grayscale(100%);
	-ms-filter: grayscale(100%);
	-o-filter: grayscale(100%);
	filter: url("data:image/svg+xml;utf8,<svg xmlns=\'http://www.w3.org/2000/svg\'><filter id=\'grayscale\'><feColorMatrix type=\'matrix\' values=\'0.3333 0.3333 0.3333 0 0 0.3333 0.3333 0.3333 0 0 0.3333 0.3333 0.3333 0 0 0 0 0 1 0\'/></filter></svg>#grayscale"); /* Firefox 3.5+ */
	filter: grayscale(100%);
	filter: gray; // IE 6-9
}