.platform {
  width: 100%;
}

.platform-content {
  width: 656px;
  margin: auto;
  margin-top: 56px;
  height: 564px;
  position: relative;
}

.platform-content img {
  position: absolute;
  left: 50%;
  transform: translate(-50%, 0);
}

.platform-content .pc-1 {
  top: 50%;
  transform: translate(-50%, -50%);
  animation: floatQuick ease 4s infinite;
}

.platform-content .pc-2 {
  z-index: 22;
  animation: floatSlow ease 4s infinite;
}

@keyframes floatQuick {
  0% {
    top: calc(50% + 10px);
  }
  50% {
    top: calc(50% - 20px);
  }
  100% {
    top: calc(50% + 10px);
  }
}

@keyframes floatSlow {
  0% {
    top: -15px;
  }
  50% {
    top: 30px;
  }
  100% {
    top: -15px;
  }
}

.combination {
  background: url("../images/cc-bg.png") no-repeat;
  background-size: 100% 100%;
}

.combination-content {
  width: 1180px;
  margin: auto;
  margin-top: 60px;
}

.manage {
  background: url("../images/manage-bg.png") no-repeat;
  background-size: 100% 100%;
}

.manage-content {
  width: 1071px;
  margin: auto;
  margin-top: 35px;
}

.advantage {
  background: url("../images/ca-bg.png") no-repeat;
  background-size: 100% 100%;
}

.advantage-content {
  width: 1068px;
  margin: auto;
  margin-top: 70px;
}

.advantage-content-item {
  float: left;
  width: 180px;
  height: 238px;
  background: url("../images/ca-item-bg.png") no-repeat;
  background-size: 100% 100%;
  margin-right: 42px;
  cursor: pointer;
}

.advantage-content-item:last-child {
  margin-right: 0;
}

.advantage-content-item:hover .advantage-content-item-txt {
  background-color: #ffffff;
}

.advantage-content-item:hover .advantage-content-item-txt p {
  color: #333333;
}

.advantage-content-item:hover .advantage-content-item-txt span {
  color: #7A7A7A;
}

.advantage-content-item-top {
  padding: 21px 0 12px 0;
  width: 100%;
  height: 83px;
  text-align: center;
}

.advantage-content-item-top img {
  width: 71px;
}

.advantage-content-item-txt {
  padding: 16px 22px 0 22px;
  text-align: center;
  height: calc(100% - 132px);
  transition: all ease 0.5s 0s;
}

.advantage-content-item-txt p {
  font-size: 16px;
  color: #ffffff;
  margin-bottom: 6px;
  font-weight: bold;
}

.advantage-content-item-txt span {
  font-size: 14px;
  color: #ffffff;
}