Media query mixin

// Defining values
$small-range:   (0em, 40em);       /* 0, 640px */
$medium-range:  (40.063em, 64em);  /* 641px, 1024px */
$large-range:   (64.063em, 90em);  /* 1025px, 1440px */
$xlarge-range:  (90.063em, 120em); /* 1441px, 1920px */
$xxlarge-range: (120.063em);       /* 1921px */
 
// Defining media queries
$screen:       "only screen" !default;
$landscape:    "#{$screen} and (orientation: landscape)" !default;
$portrait:     "#{$screen} and (orientation: portrait)" !default;
$small-up:     $screen !default;
$small-only:   "#{$screen} and (max-width: #{upper-bound($small-range)})" !default;
$medium-up:    "#{$screen} and (min-width:#{lower-bound($medium-range)})" !default;
$medium-only:  "#{$screen} and (min-width:#{lower-bound($medium-range)}) and (max-width:#{upper-bound($medium-range)})" !default;
$large-up:     "#{$screen} and (min-width:#{lower-bound($large-range)})" !default;
$large-only:   "#{$screen} and (min-width:#{lower-bound($large-range)}) and (max-width:#{upper-bound($large-range)})" !default;
$xlarge-up:    "#{$screen} and (min-width:#{lower-bound($xlarge-range)})" !default;
$xlarge-only:  "#{$screen} and (min-width:#{lower-bound($xlarge-range)}) and (max-width:#{upper-bound($xlarge-range)})" !default;
$xxlarge-up:   "#{$screen} and (min-width:#{lower-bound($xxlarge-range)})" !default;
$xxlarge-only: "#{$screen} and (min-width:#{lower-bound($xxlarge-range)}) and (max-width:#{upper-bound($xxlarge-range)})" !default;
 
// Usage
@media #{$small-up}     { ... }
@media #{$small-only}   { ... }
@media #{$medium-up}    { ... }
@media #{$medium-only}  { ... }
@media #{$large-up}     { ... }
@media #{$large-only}   { ... }
@media #{$xlarge-up}    { ... }
@media #{$xlarge-only}  { ... }
@media #{$xxlarge-up}   { ... }
@media #{$xxlarge-only} { ... }