.box{
  min-width: 1200px;
  max-width: 100%;
}
.head{
  position: relative;
  width: 100%;
  height: 510px;
}
.icon{
  position: absolute;
  width: 188px;
  top: 30px;
  left: 2.5%;
}
.head ul{
  position: absolute;
  right: 5%;
  top: 15px;
}
.head ul li{
  display: inline;
  line-height: 86px;
  margin: 25px;
}
.head ul li a{
  font-size: 18px;
  font-family: "PingFangSC";
  color: #999999;
}
.liactive{
  color: #f99d26 !important;
}
.head-img img{
  position: absolute;
  min-width: 1200px;
  max-width: 100%;
  height: 400px;
  top: 110px;
}
.center{
  width: 100%;
  height: 1550px;
  text-align: center;
}
.upper{
  width: 1330px;
  height: 600px;
  margin: 100px 15% 65px 15%;
}
.lower{
  width: 1220px;
  height: 950px;
  display: flex;
  flex-direction: column;
  align-items: center;
  text-align: left;
  margin: 0 18%;
}
.lower-one{
  width: 100%;
  height: 400px;
}
.lower-one h1{
  margin-bottom: 65px;
  font-size: 38px;
  color: #333;
}
.lower-one p,span{
  color: #666;
  font-size: 20px;
  line-height: 36px;
}
.lower-two{
  width: 1220px;
  height: 240px;
  text-align: center;
  margin: 100px auto;
}
.lower-two li{
  display: inline-block;
  height: 240px;
  margin: 0 110px 0 10px;
}
.lower-two i{
  font-size: 18px;
  color: #999;
}
.lower-two strong{
  height: 40px;
  font-size: 40px;
}
.lower-two sup{
  height: 20px;
  font-size: 20px;
  font-weight: bold;
}
.lower-two b{
  font-size: 24px;
}