$bg-color: #fff;
$fg-color: #000;
$bg-color-hover: #e8e8e8;
$border-color: #c0c0c0;
$border-radius: 3px;
$height: 2.25em;
$padding: 0.75em; // left/right padding
$font-size: 14px;

.atc-btn-group {
  background-color: $bg-color;
  color: $fg-color;
  border: 1px solid $border-color;
  border-radius: $border-radius;
  height: $height;
  line-height: $height;
  font-size: $font-size;
  display: inline-block;
  position: relative;
  font-family: Helvetica, Arial, sans-serif;
  box-sizing: border-box;
  cursor: pointer;

  &:hover {
    background-color: $bg-color-hover;
  }

  &.active {
    box-shadow: inset 0 3px 5px rgba(0,0,0,.125);
    background-color: $bg-color-hover;
  }

  .atc-dropdown {
    position: absolute;
    list-style: none;
    left: 0;
    margin: 0;
    padding: 0;
    top: $height;
    border-radius: $border-radius;
    background-color: $bg-color;
    border: 1px solid $border-color;
    box-sizing: border-box;
    width: 12em;
    box-shadow: 0 3px 5px rgba(0,0,0,0.16), 0 3px 5px rgba(0,0,0,0.23);

    > li {
      box-sizing: border-box;
      border-radius: $border-radius;
      padding: 0 $padding;
  
      > a {
        color: #000;
        text-decoration: none;
      }
  
      &:hover {
        background-color: $bg-color-hover;
      }
    }
  }

  > span {
    vertical-align: middle;
    padding: $padding;
  }

  .caret {
    display: inline-block;
    width: 0;
    height: 0;
    margin-left: 2px;
    vertical-align: middle;
    border-top: 4px dashed;
    border-top: 4px solid\9;
    border-right: 4px solid transparent;
    border-left: 4px solid transparent;
  }
}