function altitude_widget_area_class( $id ) {

	$count = altitude_count_widgets( $id );

	$class = '';

	if ( 1 === $count ) {
		$class .= ' widget-full';
	} elseif ( 1 === $count % 3 && 7 !== $count ) {
		$class .= ' widget-thirds';
	} elseif ( 1 === $count % 4 ) {
		$class .= ' widget-fourths';
	} elseif ( 7 === $count ) {
		$class .= ' widget-sixths';
	} elseif ( 0 === $count % 2 ) {
		$class .= ' widget-halves uneven';
	} else {
		$class .= ' widget-halves';
	}

	return $class;

}