#topimg {
  width:100%;
  background-image:url("../img/product/banner02.png");
  background-repeat:no-repeat;
  -moz-background-size:100%;
  -webkit-background-size:100%;
  -o-background-size:100%;
  -ms-behavior:url(backgroundsize.min.htc);
  behavior:url(backgroundsize.min.htc);
  background-size:100%;
  min-width:1000px
}
.top-null {
  display:block;
  padding-top:20.88%
}
.top-title {
  position:absolute;
  margin-top:-23.88%;
  width:100%
}
.pro-intro-title {
  position:relative;
  margin:0 auto;
  font-size:3.8em
}
.pro-intro-contain {
  margin-top:2%;
  font-size:2em;
  line-height:1.5
}
.topimg img {
  width:100%
}
.top-nav {
  width:100%;
  margin:-40px auto
}
.top-nav-contain {
  min-width:1000px;
  margin:0 auto;
  height:80px;
  background-color:inherit
}
.top-nav-contain .nev-tec,.top-nav-contain img {
  display:inline-block;
  line-height:100px;
  vertical-align:middle
}
.top-nav-contain .nev-tec {
  color:#000;
  font-size:1.8em;
  margin:0 5px 0 5px
}
.top-nav-contain .active {
  font-size:20px;
  color:#3c5eca
}
.top-nav-contain img {
  width:330px
}
.top-nav-contain span {
  padding:0 5px 0 5px
}
.top-nav .tec-jiehe {
  display:block;
  color:#343434;
  margin-top:13px;
  font-size:2.0em;
  font-weight:bold
}
.top-nav .underline {
  width:47px;
  margin-bottom:20px
}

/* 新增2019-4-19 */
.top_banner {
  box-sizing: border-box;
  margin-top: 60px;
  width: 100%;
  min-width: 1024px;
  position: relative;
  overflow: hidden;
}
.top_banner img {
  width: 100%;
}
.top_title {
  position: absolute;
  top: 36%;
  left: 50%;
  transform: translate(-50%, -50%);
  -webkit-transform: translate(-50%, -50%);
  -moz-transform: translate(-50%, -50%);
  -ms-transform: translate(-50%, -50%);
  -o-transform: translate(-50%, -50%);
}
.top_title p:first-child {
  font-size: 30px;
  line-height: 100px;
}
.top_title p:nth-child(2) {
  font-size: 22px;
  line-height: 28px;
}
.top_banner::after {
  content: '';
  width: 132%;
  padding-bottom: 40%;
  background-color: #fff;
  position: absolute;
  top: 75%;
  left: -16%;
  border-radius: 50% 50% 0 0;
}
.p_model1 {
  margin: 50px 0;
  padding: 50px 0;
  background: #F5F5F5;
  display: flex;
  flex-direction: column;
  justify-content: center;
  align-items: center;
}
.p_model1 video {
  border-radius: 8px;
  width: 561px;
}
.darkBackwhiteFont {
  color: #fff;
  background-color: #3C5FCA;
}
.detail_btn {
  display: inline-block;
  box-sizing: border-box;
  padding: 10px 20px; 
  margin-top: 30px;
  font-size: 16px;
  border-radius: 10px;
  font-weight: 600;
  font-family: Source Han Sans CN;
}
.p_model2 {
  display: flex;
  justify-content: center;
  align-items: center;
}
.model2_left {
  width: 578px;
}
.left_title {
  font-size: 24px;
  font-family: Source Han Sans CN;
  font-weight: bold;
  color: #3C5ECA;
  line-height: 30px;
  text-align: left;
  margin-bottom: 30px;
}
.left_content {
  font-size: 18px;
  font-family: Source Han Sans CN;
  font-weight: 500;
  color: #343434;
  line-height: 30px;
  text-align: left;
}
.model2_right {
  width: 222px;
  height: 234px;
  margin-left: 150px;
  /* background: #F5F5F5; */
}
.play-img {
  width: 150px;
  height: 150px;
  margin: 16px;
}
.img-desc {
  font-size: 2.4em;
  font-family: PingFang SC;
  font-weight: bold;
  color: #343434;
}
.p_model3 {
  margin: 50px 0;
  padding: 50px 0;
  background: #F5F5F5;
}
.model3-img {
  width: 950px;
}
.p_model4 {
  margin: 50px 0;
  padding: 50px 0;
}