.section1 {
  height: 724px;
  position: relative;
}
.section1 .inline {
  position: relative;
  z-index: 2;
  width: 1180px;
  margin: 0 auto;
  padding-top: 195px;
  text-align: left
}
.section1 .inline .title {
  font-size: 60px;
  color: #fff;
  margin-left: 322px;

}
.section1 .inline .desc {
  margin-left: 322px;
  line-height: 60px;
  font-size: 24px;
  margin-top: 59px;
  color: #fff;
}
.section1 .inline .desc .layer span {
  margin-right:93px;
}
.section2 .title,
.section3 .title,
.section4 .title {
  text-align: center;
  padding-top: 101px;
  font-size: 35px;
  font-weight: normal;
}

.section2 {
  height: 946px;
}

.section3 {
  background: #13AFF7;
}
.section3 h1.title{
  color: #fff;
}
.section3 .using {
  width:62.5%;
  padding-top: 100px;
  padding-bottom: 140px;
  overflow: hidden;
  margin: 0 auto;
}
.section3 .underline:after {
  background:#fff !important;
}
.section3 .using .item {
  display: block;
  width: 20%;
  /* *width: 12.45%; */
  height: 240px;
  position: relative;
  background-color: transparent;
  float: left;
}

.section3 .using .item .bg-box {
  border: 2px solid rgba(231, 237, 255, 1);

  transition: filter 5s;
  -webkit-transition: -webkit-filter 5s;
  -moz-transition: -moz-filter 5s;
  -o-transition: -o-filter 5s;

  -webkit-filter: grayscale(100%);
  -moz-filter: grayscale(100%);
  -o-filter: grayscale(100%);
  filter: grayscale(100%);
  margin: -4px;
}

.section3 .using .item:hover .bg-box {
  transition: filter 200ms;
  -webkit-transition: -webkit-filter 200ms;
  -moz-transition: -moz-filter 200ms;
  -o-transition: -o-filter 200ms;

  -webkit-filter: none;
  -moz-filter: none;
  -ms-filter: none;
  -o-filter: none;
  filter: none;
}

.epiboly-box{
  position: relative;
  width: 1300px;
  height: 548px;
  margin: 140px auto auto;
  /*overflow: hidden;*/
}

@media screen and (max-width: 1600px) {
  .section3 .using .item {
    height: 198px;
  }
}

@media screen and (max-width: 1400px) {
  .section3 .using .item {
    height: 173px;
  }
}

@media screen and (max-width: 1300px) {
  .section3 .using .item {
    height: 153px;
  }
}