/// Responsive breakpoint manager
/// @access public
/// @param {String} $breakpoint - Breakpoint
/// @requires $breakpoints
@mixin respond-to( $breakpoint ) {
  $raw-query: map-get( $av-breakpoints, $breakpoint );

  @if $raw-query {
    $query: if(
      type-of($raw-query) == 'string',
      unquote($raw-query),
      inspect($raw-query)
    );

    @media #{$query} {
      @content;
    }
  } @else {
    @error 'No value found for `#{$breakpoint}`. '
    + 'Please make sure it is defined in `$av-breakpoints` map.';
  }
}