// Additionnal "utility" breakpoints aliases
// ex. @include respond-to("portrait-up") {...} 
@function breakpoint($bp) {
  @if $bp == 'mobile' {
    @return '(max-width: #{$tiny})';
  }
  @else if $bp == 'portrait' {
    @return '(min-width: #{$tiny + 1}) and (max-width: #{$small})';
  }
  @else if $bp == 'landscape' {
    @return '(min-width: #{$small + 1}) and (max-width: #{$medium})';
  }
  @else if $bp == 'desktop' {
    @return '(min-width: #{$medium + 1})';
  }
  @else if $bp == 'portrait-down' {
    @return '(max-width: #{$small})';
  }
  @else if $bp == 'portrait-up' {
    @return '(min-width: #{$tiny + 1})';
  }
  @else if $bp == 'landscape-down' {
    @return '(max-width: #{$medium})';
  }
  @else if $bp == 'landscape-up' {
    @return '(min-width: #{$small + 1})';
  }
  @else if $bp == 'retina' {
    @return '(-webkit-min-device-pixel-ratio: 2), (min-resolution: 192dpi), (min-resolution: 2dppx)';
  }
}

@mixin respond-to($value) {
  $string: breakpoint($value);
  @media screen and #{$string} {
    @content;
  }
}