a:focus {
  outline: none;
  text-decoration: none;
}
.nav-wrap {
  width: 100%;
  height: 60px;
  background-color: #fff;
}
.nav-wrap .nav-center {
  width: 1200px;
  height: 60px;
  margin: 0 auto;
  display: flex;
  align-items: center;
}
.nav-wrap .nav-center .logo-wrap img {
  width: 120px;
}
.nav-wrap .nav-center .nav-list {
  margin-left: 40px;
  display: flex;
  align-items: center;
  justify-content: flex-start;
}
.nav-wrap .nav-center .nav-list .nav-item {
  position: relative;
  height: 60px;
  margin-right: 35px;
  cursor: pointer;
}
.nav-wrap .nav-center .nav-list .nav-item:hover .sub-list {
  display: block;
}
.nav-wrap .nav-center .nav-list .nav-item .nav-link {
  width: 78px;
  height: 60px;
  line-height: 60px;
  display: block;
  text-align: center;
  font-size: 16px;
  color: #314051;
}
.nav-wrap .nav-center .nav-list .nav-item .nav-link:hover {
  color: #2f8dfb;
}
.nav-wrap .nav-center .nav-list .nav-item .sub-list {
  position: absolute;
  top: 60px;
  left: -167px;
  width: 640px;
  padding: 50px;
  display: none;
  box-shadow: 0 0 5px 0 #ccc;
  background-color: #fff;
  z-index: 9999;
}
.nav-wrap .nav-center .nav-list .nav-item .sub-list .sub-item {
  float: left;
  width: 25%;
}
.nav-wrap .nav-center .nav-list .nav-item .sub-list .sub-item .sub-title {
  font-size: 16px;
  font-weight: bold;
  color: #314051;
}
.nav-wrap .nav-center .nav-list .nav-item .sub-list .sub-item .third-list {
  margin-top: 30px;
}
.nav-wrap .nav-center .nav-list .nav-item .sub-list .sub-item .third-list .third-item {
  display: flex;
  align-items: flex-start;
  justify-content: space-around;
  flex-flow: column wrap;
}
.nav-wrap .nav-center .nav-list .nav-item .sub-list .sub-item .third-list .third-item .third-link {
  margin-bottom: 20px;
  font-size: 14px;
  color: #929eac;
}
.nav-wrap .nav-center .nav-list .nav-item .sub-list .sub-item .third-list .third-item .third-link:hover {
  color: #2f8dfb;
}
.nav-wrap .nav-center .nav-list .active-first {
  color: #2f8dfb;
}
.nav-wrap .nav-center .nav-list .active-first .nav-link {
  color: #2f8dfb;
}
#video-box {
  background-color: #ccc;
  position: fixed;
  opacity: 0;
  width: 800px;
  height: 450px;
  top: -100%;
  left: 50%;
  transform: translateX(-50%);
  z-index: 99999;
}
#video-box #close {
  position: absolute;
  width: 40px;
  height: 40px;
  line-height: 40px;
  font-size: 30px;
  font-weight: 800;
  text-align: center;
  color: #ccc;
  right: -40px;
  top: 0;
  background-color: #000;
  cursor: pointer;
}
.mask {
  position: relative;
  display: block;
  opacity: 0;
  width: 100%;
  height: 0;
  top: 0;
  left: 0;
  background-color: rgba(0, 0, 0, 0.5);
  z-index: 0;
}