index.less

@inputNumberPrefixCls: rc-input-number;

.@{inputNumberPrefixCls} {
  margin: 0;
  padding: 0;
  line-height: 26px;
  font-size: 12px;
  height: 26px;
  display: inline-block;
  vertical-align: middle;
  border: 1px solid #d9d9d9;
  border-radius: 5px;
  box-sizing: content-box;

  &-handler {
    text-align: center;
    line-height: 12px;
    height: 12px;
    overflow: hidden;
    display: block;
    touch-action: none;

    &-active {
      background: #ddd;
    }
  }

  &-handler-up-inner,
  &-handler-down-inner {
    color: #666666;
    user-select: none;
    -webkit-user-select: none;
  }

  &:hover {
    border-color: #23c0fa;

    .@{inputNumberPrefixCls}-handler-up,
    .@{inputNumberPrefixCls}-handler-wrap {
      border-color: #23c0fa;
    }
  }

  &-disabled:hover {
    border-color: #d9d9d9;

    .@{inputNumberPrefixCls}-handler-up,
    .@{inputNumberPrefixCls}-handler-wrap {
      border-color: #d9d9d9;
    }
  }

  &-input-wrap {
    overflow: hidden;
    height: 26px;
  }

  &-input {
    width: 100%;
    text-align: center;
    outline: 0;
    -moz-appearance: textfield;
    line-height: 26px;
    height: 26px;
    transition: all 0.3s ease;
    color: #666666;
    border: 0;
    border-radius: 5px;
    padding: 0;
  }

  &-handler-wrap {
    float: right;
    border-left: 1px solid #d9d9d9;
    width: 20px;
    height: 26px;
  }

  &-handler-up {
    border-bottom: 1px solid #d9d9d9;
    padding-top: 1px;
    &-inner {
      &:after {
        content: '+';
      }
    }
  }

  &-handler-down {
    &-inner {
      &:after {
        content: '-';
      }
    }
  }

  .handler-disabled() {
    opacity: 0.72;
    &:hover {
      color: #999;
      border-color: #d9d9d9;
    }
  }

  &-handler-down-disabled,
  &-handler-up-disabled {
    .handler-disabled();
  }

  &-disabled {
    .@{inputNumberPrefixCls}-input {
      opacity: 0.72;
      cursor: not-allowed;
      background-color: #f3f3f3;
    }
    .@{inputNumberPrefixCls}-handler {
      .handler-disabled();
    }
  }
}