/** 白屏阶段会执行的 CSS 加载动画 */

#app-loading {
  display: flex;
  justify-content: center;
  align-items: center;
  margin-top: 20%;
}

#app-loading > .loader {
  width: 5em;
  height: 5em;
  display: inline-block;
  position: relative;
  border: 2px solid #4385f5;
  border-radius: 0.5em;
  box-sizing: border-box;
  animation: rotation 5s linear infinite;
}
#app-loading > .loader::after,
#app-loading > .loader::before {
  content: "";
  box-sizing: border-box;
  position: absolute;
  left: 0;
  right: 0;
  top: 0;
  bottom: 0;
  margin: auto;
  border: 2px solid #e14337;
  width: 4em;
  height: 4em;
  animation: rotationBack 2.5s linear infinite;
  transform-origin: center center;
  border-radius: 0.5em;
}
#app-loading > .loader::before {
  width: 3em;
  height: 3em;
  border-color: #f9bc04;
  box-sizing: border-box;
  animation: rotation 10s linear infinite;
  border-radius: 0.5em;
}

@keyframes rotation {
  0% {
    transform: rotate(0deg);
  }
  100% {
    transform: rotate(360deg);
  }
}
@keyframes rotationBack {
  0% {
    transform: rotate(0deg);
  }
  100% {
    transform: rotate(-360deg);
  }
}