@import '../style/var.less';

.van-virtual-backto-top {
  width: 50px;
  height: 50px;
  border-radius: 50%;

  .theme(background-color, '@primary-color');

  color: #ffffff;
  display: flex;
  align-items: center;
  justify-content: center;
  position: fixed;
  bottom: 60px;
  right: 24px;
  z-index: 999;
  opacity: 0;
  animation-name: van-virtual-backto-top-show;
  animation-duration: 0.5s;
  animation-fill-mode: forwards;
}

.van-virtual-backto-top-hidden {
  .van-virtual-backto-top {
    animation-name: van-virtual-backto-top-hidden;
    animation-fill-mode: forwards;
  }
}

@keyframes van-virtual-backto-top-show {
  0% {
    opacity: 0;
  }

  25% {
    opacity: 0.2;
  }

  50% {
    opacity: 0.4;
  }

  75% {
    opacity: 0.6;
  }

  100% {
    opacity: 0.7;
  }
}

@keyframes van-virtual-backto-top-hidden {
  0% {
    opacity: 0.7;
  }

  25% {
    opacity: 0.6;
  }

  50% {
    opacity: 0.5;
  }

  75% {
    opacity: 0.3;
  }

  100% {
    opacity: 0;
  }
}