.research-nav{
  position: fixed;
  display: flex;
  flex-direction: column;
  width: 100%;
  max-width: 9.375rem;
  top: 50%;
  transform: translateY(-50%);
  left: 1.875rem;
  z-index: 10;
}
.research-nav.fixed{
  position: fixed;
  top: 50%;
  transform: translateY(-50%);
}
.research-nav a{
  color:#B5B5B5;
  width: 100%;
  font-size: .875rem;
  line-height: 3.25rem;
  display: flex;
  align-items: center;
}
.research-nav a span{
  width: 1.875rem;
  text-align: center;
  margin-right: .625rem;
}
.research-nav a span::before{
  display: inline-block;
  vertical-align: middle;
  content: '';
  width: 1.25rem;
  height: 1px;
  background-color: #666;
  transition: all .3s;
}
.research-nav a.active{
  color: var(--primaryColor);
}
.research-nav a.active span::before,
.research-nav a:hover span::before{
  width: 1.875rem;
  background-color: var(--primaryColor);
}

.research-1{
  background-color: #eafcff;
  padding-top: 15.3125rem;
  padding-bottom: 11.25rem;
}

.research-1 i{
  color: #666;
}

.research-1 .item-title{
  font-size: 2.8125rem;
  line-height: 2.8125rem;
  color: var(--darkColor);
  margin-top: 1.25rem;
}
.research-1 .desc{
  font-size: 1rem;
  line-height: 2rem;
  color: #666;
  margin-top: 3.125rem;
  font-weight: normal;
}

.research-1 ol{
  display: flex;
  align-items: center;
  margin-top: 3.75rem;
}
.research-1 ol li{
  flex: 1;
  min-width: 0;
}
.research-1 ol li span{
  display: block;
  font-weight: bold;
  font-size: 3.125rem;
  font-family: 'numberFont';
  line-height: 3.4375rem;
}
.research-1 .swiper{
  margin-top: 5rem;
}
.research-1 .swiper .img-box{
  width: 100%;
}
.research-1 .swiper .img-box img{
  width: 100%;
}
.research-1 .swiper-pagination{
  width: auto;
  left: 2.5rem;
  bottom: 2.5rem;
  right: initial;
}
.research-1 .swiper-pagination .swiper-pagination-bullet{
  margin: 0 1.125rem 0 0 !important;
  width: 1rem;
  height: 1rem;
  background-color: #ccc;
  opacity: 1;
}
.research-1 .swiper-pagination .swiper-pagination-bullet-active{
  background-color: var(--primaryColor);
}
.research-2{
  background-color: #eafcff;
}

.research-2-tit .box-title{
  font-size: 2.375rem;
  line-height: 2.375rem;
}
.research-2-tit p{
  font-size: 1rem;
  line-height: 2rem;
  color: #666;
  margin-top: 3.125rem;
  font-weight: normal;
}
.research-2-items{
  background-image: url(../images/pic78.jpg);
  background-position: 50% 50%;
  background-repeat: no-repeat;
  background-size: cover;
  margin-top: 5rem;
  padding: 7.5rem;
  padding-bottom: 10rem;
}
.research-2-items .item-title{
  font-size: 1.625rem;
  color: #FFF;
}
.research-2-items ul{
  display: flex;
  align-items: flex-start;
  margin-top: 6.25rem;
}

.research-2-items ul li.flip-item {
  flex: 1;
  min-width: 0;
  height: 15.625rem;
  border-radius: .625rem;
  overflow: hidden;
  cursor: pointer;
  margin-right: 1.375rem;
}
.research-2-items ul li.flip-item:last-child{
  margin-right: 0;
}
.research-2-items ul li.flip-item .flipper {
  position: relative;
  width: 100%;
  height: 100%;
  transform-style: preserve-3d;
  transition: transform 0.6s;
}
.research-2-items ul li.flip-item .front{
  background-color: rgba(255,255,255,.3);
  display: flex;
  flex-direction: column;
  align-items: center;
  color: #FFF;
  padding-top: 3.125rem;
}
.research-2-items ul li.flip-item .front img{
  width: 5.625rem;
  height: 5.625rem;
}
.research-2-items ul li.flip-item .front h4{
  margin-top: 2.8125rem;
  font-size: 1.125rem;
  line-height: 2rem;
  font-weight: normal;
}
.research-2-items ul li.flip-item:last-child .front h4{
  margin-top: 1.5625rem;
}

.research-2-items ul li.flip-item .front, 
.research-2-items ul li.flip-item .back {
  position: absolute;
  width: 100%;
  height: 100%;
  backface-visibility: hidden;
  overflow: hidden;
}

.research-2-items ul li.flip-item .back {
  transform: rotateY(180deg);
}
.research-2-items ul li.flip-item .back .img-box{
  width:100%;
}
.research-2-items ul li.flip-item .back .img-box img{
  width: 100%;
}
.research-2-items ul li.flip-item .back h4{
  position: absolute;
  bottom: 0;
  left: 0;
  right: 0;
  text-align: center;
  color: #FFF;
  background-color: var(--primaryColor);
  font-size: 1.125rem;
  font-weight: normal;
  line-height: 2rem;
  padding: 5px 0;
}
.research-2-items ul li.flip-item:hover .flipper {
  transform: rotateY(180deg);
}
.research-3{
  background-color: #eafcff;
  padding-top: 11.875rem;
  padding-bottom: 5rem;
}
.research-3 .box-title{
  font-size: 2.375rem;
  line-height: 2.375rem;
}
.research-3 dl{
  display: flex;
  align-items: center;
  margin-top: 3.125rem;
}
.research-3 dl dt{
  max-width: 41.25rem;
  margin-right: 6.875rem;
  font-size: 1rem;
  line-height: 2rem;
  color: #666;
}
.research-3 dl dd{
  flex: 1;
  min-width: 0;
  display: flex;
  align-items: center;
  justify-content: flex-end;
}
.research-3 dl dd .item{
  flex: 1;
}
.research-3 dl dd .item p{
  margin-bottom: .9375rem;
  font-size: 1rem;
  line-height: 1rem;
  color: #666;
}
.research-3 dl dd .item span{
  font-family: 'numberFont';
  font-size: 3.75rem;
  line-height: 3.75rem;
  font-weight: bold;
}
.research-3 .img-banner{
  width: 100%;
  margin-top: 5.3125rem;
}
.research-3 .img-banner img{
  width: 100%;
}
.research-3 .zs{
  display: flex;
  align-items: center;
  justify-content: center;
  margin-top: 5rem;
}
.research-3 .zs .img-box{
  max-width: 28.125rem;
}
.research-3 .zs .img-box + .img-box{
  margin-left: 3.125rem;
}
.research-4{
  padding-top: 9.375rem;
  padding-bottom: 20.625rem;
}
.research-4 .box-title{
  font-size: 2.375rem;
  text-align: center;
}
.research-4 ol{
  display: flex;
  align-items: center;
  justify-content: space-between;
  border-bottom: solid 1px #ccc;
  margin-top: 5.625rem;
  padding: 0 .625rem;
}
.research-4 ol li a{
  color: #999;
  display: inline-block;
  padding-bottom: 1.25rem;
  border-bottom: solid 3px transparent;
  margin-bottom: -1px;
}
.research-4 ol li.active a{
  border-bottom-color: var(--primaryColor);
}
.research-4 .swiper{
  margin-top: 4.375rem;
}

.research-4 .swiper .swiper-slide{
  position: relative;
  opacity: .3;
  transition: all .3s;
}
.research-4 .swiper .swiper-slide-active{
  opacity: 1;
}
.research-4 .swiper .swiper-slide img{
  width: 100%;
  border-radius: .625rem;
  border: solid 1px #ccc;
}
.research-4 .swiper .swiper-slide .info{
  position: absolute;
  bottom: 2.5rem;
  left: 2.5rem;
  color: #FFF;
  line-height: 1.875rem;
}
.research-4 .swiper .swiper-slide .info h3{
  font-size: 1.25rem;
}
.research-4 .swiper .swiper-slide .info p{
  font-size: 1rem;
}