@mixin font-size($size, $margin:yes, $line-height:$doc-line-height) {
	@if $margin == yes  {
		font-size: 0px + $size;
		font-size: 0rem + $size / $doc-font-size;
		line-height: ceil($size / $doc-line-height) * ($doc-line-height / $size);
		margin-bottom: 0px + $line-height;
		margin-bottom: 0rem + ($line-height / $doc-font-size);
	}
	@if $margin != yes {
		font-size: 0px + $size;
		font-size: $size / $doc-font-size +rem;
		line-height: ceil($size / $line-height) * ($line-height / $size);
	}

}

@mixin font-rem($size) {
	font-size: 0px + $size;
	font-size: $size / $doc-font-size +rem;
}

@function rem($size) {
	@return #{$size/$doc-font-size}rem
}

@function em($size) {
	@return #{$size/$doc-font-size}em
}