=margin($value1, $value2: null)
  @if number(nth($value1, 1)) or nth($value1, 1) == 'auto'
    @if equal_nth($value1, 1)
      +rem('margin', $value1)
    @else if equal_nth($value1, 2)
      +rem('margin-top', nth($value1, 1))
      +rem('margin-bottom', nth($value1, 2))
    @else if equal_nth($value1, 3)
      +rem('margin-top', nth($value1, 1))
      +rem('margin-bottom', nth($value1, 3))
      +margin(horizontal, nth($value1, 2))
    @else if equal_nth($value1, 4)
      +rem('margin-top', nth($value1, 1))
      +rem('margin-right', nth($value1, 2))
      +rem('margin-bottom', nth($value1, 3))
      +rem('margin-left', nth($value1, 4))
  @else if length($value1) == 1 and nth($value1, 1) == 'vertical'
    +rem('margin-top', if(list($value2), nth($value2, 1), $value2))
    +rem('margin-bottom', if(list($value2),nth($value2, 2), $value2))
  @else if length($value1) == 1 and nth($value1, 1) == 'horizontal'
    +rem('margin-left', if(list($value2), nth($value2, 1), $value2))
    +rem('margin-right', if(list($value2),nth($value2, 2), $value2))
  @else
    @each $position in $value1
      @if $position == 'all'
        +rem('margin', $value2)
      @else if $position == 'vertical'
        +rem('margin-top', $value2)
        +rem('margin-bottom', $value2)
      @else if $position == 'horizontal'
        +rem('margin-left', $value2)
        +rem('margin-right', $value2)
      @else
        +rem('margin-#{$position}', $value2)

=padding($value1: null, $value2: null)
  @if number(nth($value1, 1)) or nth($value1, 1) == 'auto'
    @if equal_nth($value1, 1)
      +rem('padding', $value1)
    @else if equal_nth($value1, 2)
      +rem('padding-top', nth($value1, 1))
      +rem('padding-bottom', nth($value1, 2))
    @else if equal_nth($value1, 3)
      +rem('padding-top', nth($value1, 1))
      +rem('padding-bottom', nth($value1, 3))
      +padding(horizontal, nth($value1, 2))
    @else if equal_nth($value1, 4)
      +rem('padding-top', nth($value1, 1))
      +rem('padding-right', nth($value1, 2))
      +rem('padding-bottom', nth($value1, 3))
      +rem('padding-left', nth($value1, 4))
  @else if length($value1) == 1 and nth($value1, 1) == 'vertical'
    +rem('padding-top', if(list($value2), nth($value2, 1), $value2))
    +rem('padding-bottom', if(list($value2),nth($value2, 2), $value2))
  @else if length($value1) == 1 and nth($value1, 1) == 'horizontal'
    +rem('padding-left', if(list($value2), nth($value2, 1), $value2))
    +rem('padding-right', if(list($value2),nth($value2, 2), $value2))
  @else
    @each $position in $value1
      @if $position == 'all'
        +rem('padding', $value2)
      @else if $position == 'vertical'
        +rem('padding-top', $value2)
        +rem('padding-bottom', $value2)
      @else if $position == 'horizontal'
        +rem('padding-left', $value2)
        +rem('padding-right', $value2)
      @else
        +rem('padding-#{$position}', $value2)