@mixin clearfix {
  &::after {
    clear: both;
    content: '';
    display: table;
  }
}

@mixin null-margins {
  > :first-child {
    margin-top: 0 !important;
  }

  > :last-child {
    margin-bottom: 0 !important;
  }
}

@mixin hover {
  &:focus,
  &:hover {
    @content;
  }
}

@mixin a11y-focus {
  &:active,
  &:focus {
    box-shadow: 0 0 0 3px orange !important;
    outline: none !important;
  }

  [data-whatintent='mouse'] &:active,
  [data-whatintent='mouse'] &:focus,
  [data-whatintent='touch'] &:active,
  [data-whatintent='touch'] &:focus {
    box-shadow: none !important;
  }
}

@mixin input-style-base {
  appearance: none;
  background-color: #fff;
  border: 1px solid #ccc;
  border-radius: 4px;
  color: #555;
  font-family: 'Helvetica Neue', Helvetica, Arial, sans-serif;
  font-size: 16px;
  height: ($unit * 4);
  margin: 0;
  padding: 0 $unit;
  width: 100%;
}

@mixin placeholder {
  &::-webkit-input-placeholder {
    // Chrome/Opera/Safari
    @content;
  }

  &::-moz-placeholder {
    // Firefox 19+
    @content;
  }

  &:-ms-input-placeholder {
    // IE 10+
    @content;
  }
}