.header {
  width: 100%;
  height: 70px;
  position: absolute;
  z-index: 99;
  top: 0;
  background: rgba(4, 4, 17, 0.5);
  box-shadow: 0px 1px 10px 0px rgba(0, 0, 0, 0.3);
}

.top-title {
  margin: 0 auto;
  width: 1150px;
}

.top-l {
  width: 181px;
  height: 44px;
  margin-top: 9px;
  background: url('../images/logo1.png') no-repeat;
  opacity: 1;
}

.top-r {
  height: 70px;

}

.tab-item {
  float: left;
  color: #999;
  font-size: 20px;
  font-weight: 400;
  text-align: center;
  margin-right: 54px;
  position: relative;
  cursor: pointer;
  line-height: 70px;
}

.tab-item a {
  color: #999;
}

.tab-item:hover {
  color: #fff;
}

.item-hover:hover {
  color: #fff;
}

.tab-item:hover .showit {
  display: block;
}

.tab-item:last-child {
  margin-right: 0
}

.tab-item .showit {
  display: none;
  position: absolute;
  top: 72px;
  left: -53px;
  padding: 25px 0;
  box-sizing: border-box;
  color: #A6B5E6;
  width: 184px;
  font-size: 18px;
  background: rgba(4, 4, 17, 0.9);
  line-height: 38px;
  box-shadow: 0px 0px 5px 2px #052682 inset;
}

a:hover {
  color: #fff !important;
}

.showit .jiant {
  position: absolute;
  top: -7px;
  left: 30px;
  width: 132px;
  height: 8px;
  background: url('../images/index/jiao.png') no-repeat;
}

.tab-item .showit a {
  color: #A6B5E6;
}