css-breakpoint-mixin-vars.scss

/***************************************
  Responsive Helper
  Usage:

  .my-box {
    padding: 10px;
    @include for-size(tv) {
      padding: 80px;
    }
    @include for-size(desktop-up) {
      padding: 20px;
    }
    @include for-size(tv) {
      padding: 80px;
    }
  }
**************************************/
$phone-upper-boundary: 670px !default;
$tablet-portrait-upper-boundary: 900px !default;
$tablet-landscape-upper-boundary: 1024px !default;
$desktop-upper-boundary: 1280px !default;
$tv-upper-boundary: 1800px !default;

@mixin for-size($range) {
  @if $range == phone-only {
    @media (max-width: #{$phone-upper-boundary - 1}) { @content; }
  } @else if $range == phone-only-landscape {
    @media (max-width: #{$phone-upper-boundary - 1}) and (orientation: landscape) { @content; }
  } @else if $range == tablet-portrait-up {
    @media (min-width: $phone-upper-boundary) { @content; }
  } @else if $range == tablet-landscape-up {
    @media (min-width: $tablet-portrait-upper-boundary) { @content; }
  } @else if $range == old-desktop-only {
    @media (min-width: $tablet-landscape-upper-boundary) and (max-width: #{$desktop-upper-boundary - 1}) { @content; }
  } @else if $range == desktop-up {
    @media (min-width: $desktop-upper-boundary) { @content; }
  } @else if $range == tv {
    @media (min-width: $tv-upper-boundary) { @content; }
  }
}