.content-wrap-app {
	padding-top: 60px;
}

.down-header{
	padding: 86px 0 60px;
	width: 100%;
	background-image: url("https://al-lecture-new-oss.oss-cn-hangzhou.aliyuncs.com/ah_website/images/index_bg.png");
	background-size: cover;
	background-repeat: no-repeat;
}
.down-wrap {
  max-width: 1200px;
  margin: 0 auto;
  display: flex;
}

.down-left{
  flex-shrink: 0;
  width: 500px;
  margin-right: 84px;
  padding-top: 44px;
}

.down-title {
  color: #222;
  font-size: 44px;
  line-height: 56px;
  font-weight: 500;
}

 .down-ver-info{
  margin: 20px 0 8px;
  color: #333;
  font-size: 24px;
}

.down-dateTime-info{
  line-height: 20px;
  color: #999;
  font-size: 14px;
  margin-bottom: 32px;
}

.down-wrap .device-img {
  width: calc(100% - 570px);
}

.main{
  margin: 0 auto;
  max-width: 1200px;
}

.scan-code-section{
  padding: 60px 0;
  text-align: center;
  display: flex;
  justify-content: space-around;
  flex-wrap: wrap;
  margin-bottom: 60px;
}

.client-card {
  cursor: pointer;
  position: relative;
  height: 200px;
  width: 200px;
  border-radius: 16px;
  perspective: 1000;
  -webkit-perspective: 1000;
  transform-style: preserve-3d;
  -webkit-transform-style: preserve-3d;
}

.client-card .card-os {
  overflow: hidden;
  background: #f6f6f6;
  position: absolute;
  left: 0;
  top: 0;
  width: 100%;
  height: 100%;
  box-sizing: border-box;
  display: flex;
  flex-direction: column;
  align-items: center;
  padding: 40px 0;
  border-radius: 16px;
  z-index: 100;
  transition: 0.3s;
  backface-visibility: hidden;
}
.client-card .os-img {
  width: 56px;
}

.client-card .os{
  margin: 20px 0 4px;
  color: #222;
  font-size: 16px;
  line-height: 22px;
}
.client-card .version {
  font-size: 12px;
  color: #999;
  line-height: 17px;
}

.client-card:hover .card-os {
  transform-origin: center;
  transform: rotateY(-180deg);
}
.client-card:hover .hover-wrap{
  transform-origin: center;
  transform: rotateY(0);
}
.hover-wrap {
  backface-visibility: hidden;
  transition: 0.3s;
  overflow: hidden;
  position: absolute;
  left: 0;
  top: 0;
  z-index: 1;
  box-sizing: border-box;
  width: 200px;
  height: 200px;
  color: #222;
  border-radius: 16px;
  background: #f6f6f6;
  transform: rotateY(180deg);
}

.hover-wrap .down-icon{
  margin-top: 40px;
  width: 56px;
  cursor: pointer;
}

.hover-wrap .click-down{
  margin: 20px 0 4px;
  font-size: 16px;
}

.hover-wrap .tips {
  color: #999;
  font-size: 12px;
  line-height: 17px;
}