$medium-up: "#{$screen} and (min-width:#{lower-bound($medium-range)})";
$medium-only: "#{$screen} and (min-width:#{lower-bound($medium-range)}) and (max-width:#{upper-bound($medium-range)})";
+$medium-down: "#{$screen} and (min-width:#{lower-bound($small-range)}) and (max-width:#{upper-bound($medium-range)})";
+
$large-up: "#{$screen} and (min-width:#{lower-bound($large-range)})";
$large-only: "#{$screen} and (min-width:#{lower-bound($large-range)}) and (max-width:#{upper-bound($large-range)})";
+$large-down: "#{$screen} and (min-width:#{lower-bound($small-range)}) and (max-width:#{upper-bound($large-range)})";
+
$xlarge-up: "#{$screen} and (min-width:#{lower-bound($xlarge-range)})";
$xlarge-only: "#{$screen} and (min-width:#{lower-bound($xlarge-range)}) and (max-width:#{upper-bound($xlarge-range)})";