.btn {
  /**
    * Button base
    */
  display: inline-block;
  vertical-align: middle;
  touch-action: manipulation;
  user-select: none;
  cursor: pointer;
  white-space: nowrap;
  text-decoration: none;
  text-align: center;
  border: 0;
  padding: 15px;
  font-family: $ff-sans-2;
  background: transparent;
  transition: all 0.15s ease-in-out;
  &:focus {
    outline: 0;
  }

  &--primary {
    background-color: $primary-color;
    border: 1px solid $primary-color;
    color: #fff;
    transition: all 0.25s;
    &:hover {
      background-color: #fff;
      color: $primary-color;
      box-shadow: inset 0px 0px 0px 1px $primary-color;
      text-shadow: 0px 0px 1px $primary-color;
    }
  }

  &--secondary {
    background-color: transparent;
    border: 1px solid $primary-color;
    color: $primary-color;
    transition: all 0.25s;
    &:hover {
      box-shadow: inset 0px 0px 0px 1px $primary-color;
      text-shadow: 0px 0px 1px $primary-color;
    }
  }

  &--tertiary {
    background-color: #b3b3b3;
    border: 1px solid #b3b3b3;
    color: #fff;
    cursor: default;
    transition: all 0.25s;
    &:hover {
      background-color: $gray-color;
    }
  }

  &--quaternary {
    background-color: #fff;
    border: 1px solid #fff;
    color: $primary-color;
    transition: all 0.25s;
    &:hover {
      background-color: $primary-color;
      color: #fff;
      box-shadow: inset 0px 0px 0px 1px #fff;
      text-shadow: 0px 0px 1px #fff;
    }
  }
}