Media mixins.

media.sass

$tablet: 800px
$desktop: 1000px

=media-min-height($height)
  @media screen and (min-height: $height)
    @content

=media-min-width($width)
  @media screen and (min-width: $width)
    @content

=media-portrait
  @media screen and (orientation: portrait)
    @content

=media-landscape
  @media screen and (orientation: landscape)
    @content

=media-webkit
  @media screen and (-webkit-min-device-pixel-ratio: 0)
    @content

=media-print
  @media print
    @content

=media-tablet
  +media-min-width($tablet)
    @content

=media-desktop
  +media-min-width($desktop)
    @content