.hotbox {
  font-family: Arial, "Hiragino Sans GB", "Microsoft YaHei", "WenQuanYi Micro Hei", sans-serif;
  position: absolute;
  left: 0;
  top: 0;
  overflow: visible;

  .state {
    position: absolute;
    overflow: visible;
    display: none;

    .center,
    .ring {
      .button {
        position: absolute;
        width: 70px;
        height: 70px;
        margin-left: -35px;
        margin-top: -35px;
        border-radius: 100%;
        box-shadow: 0 0 30px rgba(0, 0, 0, .3);
      }

      .label,
      .key {
        display: block;
        text-align: center;
        line-height: 1.4em;
        vertical-align: middle;
      }

      .label {
        font-size: 16px;
        margin-top: 17px;
        color: black;
        font-weight: normal;
        line-height: 1em;
      }

      .key {
        font-size: 12px;
        color: #999;
      }
    }

    .ring-shape {
      position: absolute;
      left: -25px;
      top: -25px;
      border: 25px solid rgba(0, 0, 0, .3);
      border-radius: 100%;
      box-sizing: content-box;
    }

    .top,
    .bottom {
      position: absolute;
      white-space: nowrap;

      .button {
        display: inline-block;
        padding: 8px 15px;
        margin: 0 10px;
        border-radius: 15px;
        box-shadow: 0 0 30px rgba(0, 0, 0, .3);
        position: relative;

        .label {
          font-size: 14px;
          line-height: 14px;
          vertical-align: middle;
          color: black;
          line-height: 1em;
        }

        .key {
          font-size: 12px;
          line-height: 12px;
          vertical-align: middle;
          color: #999;
          margin-left: 3px;

          &:before {
            content: '(';
          }

          &:after {
            content: ')';
          }
        }
      }
    }

    .button {
      background: #F9F9F9;
      overflow: hidden;
      cursor: default;

      .key,
      .label {
        opacity: 0.3;
      }
    }

    .button.enabled {
      background: white;

      .key,
      .label {
        opacity: 1;
      }

      &:hover {
        background: lighten(rgb(228, 93, 92), 5%);

        .label {
          color: white;
        }

        .key {
          color: lighten(rgb(228, 93, 92), 30%);
        }
      }

      &.selected {
        -webkit-animation: selected .1s ease;
        background: rgb(228, 93, 92);

        .label {
          color: white;
        }

        .key {
          color: lighten(rgb(228, 93, 92), 30%);
        }
      }

      &.pressed,
      &:active {
        background: #FF974D;

        .label {
          color: white;
        }

        .key {
          color: lighten(#FF974D, 30%);
        }
      }
    }
  }

  .state.active {
    display: block;
  }
}

@-webkit-keyframes selected {
  0% {
    transform: scale(1);
  }

  50% {
    transform: scale(1.1);
  }

  100% {
    transform: scale(1);
  }
}

.hotbox-key-receiver {
  position: absolute;
  left: -999999px;
  top: -999999px;
  width: 20px;
  height: 20px;
  outline: none;
  margin: 0;
}
