.header .tz_nav {
  width: 100%;
  height: 100px;
  background: url(../images/tzzy_sy/nav_banner.png) center no-repeat;
  background-size: cover;
}
.header .tz_nav .top_nav {
  display: flex;
  justify-content: space-between;
}
.header .tz_nav .top_nav .logo {
  margin: 22px 0;
}
.header .tz_nav .top_nav .tz-menu {
  width: 70%;
  display: flex;
  justify-content: space-between;
}
.header .tz_nav .top_nav .tz-menu li {
  line-height: 100px;
  text-align: center;
  position: relative;
}
.header .tz_nav .top_nav .tz-menu li a {
  color: #333;
  font-size: 18px;
}
.header .tz_nav .top_nav li:hover a {
  color: #0062c5;
}
.header .tz_nav .top_nav li::after {
  content: "";
  position: absolute;
  left: 50%;
  transform: translateX(-50%);
  bottom: 0;
  width: 0;
  height: 3px;
  background: #0062c5;
  transition: all 0.5s;
}
.header .tz_nav .top_nav li:hover::after {
  width: 100%;
}
.header .tz_nav .top_nav .cur a {
  color: #0062c5 !important;
}
.header .tz_nav .top_nav .cur::after {
  content: "";
  position: absolute;
  left: 50%;
  transform: translateX(-50%);
  bottom: 0;
  width: 0;
  height: 3px;
  background: #0062c5;
  transition: all 0.5s;
}
.header .tz_nav .top_nav .cur::after {
  width: 100%;
}
@media (max-width: 1200px) {
  .m_header {
    z-index: 30;
    background: url(../images/tzzy_sy/nav_banner.png) center no-repeat !important;
    width: 100%;
    height: 7rem;
    background-size: cover;
  }
  .m_header .icon_nav {
    width: 3.3rem;
    height: 7rem;
    background: url(../images/tzzy_sy/icon_2.png) right center no-repeat !important;
    background-size: 1.8rem auto !important;
  }
  .m_header .cur {
    width: 3.3rem;
    height: 7rem;
    background: url(../images/tzzy_sy/icon_3.png) right center no-repeat !important;
    background-size: 1.8rem auto !important;
  }
  .tzzy-content,
  .zn-content {
    padding-top: 7rem;
  }
  .m_header_fixed {
    background: #f4fcff !important;
    box-shadow: 0 0 0.5rem rgba(0, 0, 0, 0.3);
  }
}