.slide-ct {
  cursor: default;
  position: relative;
  width: 1620px;
  min-height: 530px;
  margin: 0px auto 70px;
  padding-top: 70px;
  display: flex;
  flex-wrap: wrap;
  height: auto;
}
.item-card {
  display: inline-block;
  margin-right: 30px;
  position: relative;
  height: 550px;
  width: 380px;
}
.item-card img {
  width: 100%;
  height: 270px;
  object-fit: cover;
}
.item-card:nth-child(4n) {
  margin-right: 0;
}
.case-nav {
  width: 100%;
  height: 100px;
  margin-top: 50px;
  font-size: 20px;
  color: rgba(0, 0, 0, 0.65);
  /* background: url("../images/bg_case_nv.jpg"); */
}
.toplist {
  display: flex;
  justify-content: center;
}
.toplist .toplist-box {
  width: 460px;
  margin: 60px 16px;
  padding-bottom: 30px;
}
.toplist .toplist-box:hover {
  box-shadow: 0px 2px 16px 0px rgba(0, 0, 0, 0.05);
  border-radius: 4px;
}

.toplist .toplist-img {
  width: 100%;
  height: 345px;
}

.toplist .toplist-img img {
  width: 100%;
  height: 100%;
  object-fit: cover;
}
.toplist .toplist-title {
  font-size: 28px;
  color: #000;
  margin: 40px 0px 12px;
  font-weight: 400;
  padding: 0 16px;
}
.toplist .toplist-dis {
  font-size: 16px;
  color: #848b99;
  text-align: justify;
  line-height: 25px;
  font-weight: 400;
  padding: 0 16px 0;
}

/* case-nav */
.case-nav {
  display: flex;
  align-items: center;
  justify-content: center;
  width: 100%;
}
.case-nav-ul {
  display: flex;
  align-items: center;
  justify-content: center;
  height: 100%;
}
.case-nav .case-nav-li {
  width: 340px;
  display: flex;
  flex-direction: column;
  justify-content: center;
  text-align: center;
  height: 100%;
  position: relative;
  cursor: pointer;
}
.case-nav .case-nav-li .num {
  font-size: 20px;
  /* color: #ffffff; */
  letter-spacing: 2px;
  font-weight: 400;
  position: relative;
  display: flex;
  justify-content: center;
}
.case-nav .case-nav-li .sup {
  position: relative;
}
.case-nav .case-nav-li .img.hight {
  display: none;
}
.case-nav .case-nav-li.active .img {
  display: none;
}
.case-nav .case-nav-li.active .img.hight {
  display: block;
}
.case-nav .case-nav-li.active .num {
  font-size: 24px;
  font-weight: 500;
  color: #3296fa;
}

.case-nav .case-nav-li .sup::after {
  font-size: 24px;
  color: #ffffff;
  content: "+";
  position: absolute;
  top: 0;
  right: -20px;
}

.case-nav .case-nav-li .cls {
  font-size: 20px;
  color: rgba(255, 255, 255, 0.85);
  font-weight: 400;
  margin-top: 16px;
}
.case-nav .case-nav-li.active:after {
  content: "";
  height: 6px;
  border-radius: 6px;
  width: 40px;
  margin-left: -20px;
  background-color: #3296fa;
  position: absolute;
  bottom: 0px;
  left: 50%;
}