* {
  margin: 0;
  padding: 0;
}
a {
  text-decoration: none;
  color: #333;
}
ul {
  list-style: none;
}
img {
  border: none;
}
html,
body {
  width: 100%;
  height: 100%;
}
.header_content {
  width: 1200px;
  margin: 0 auto;
}
.nav {
  width: 1080px;
  float: left;
}
.nav .nav_logo img {
  width: 188px;
  height: 50px;
  float: left;
  margin-top: 15px;
}
.nav ul {
  width: 880px;
  height: 80px;
  line-height: 40px;
  padding-top: 20px;
  box-sizing: border-box;
  padding-left: 20px;
  overflow: hidden;
}
.nav ul li {
  font-weight: bold;
  height: 50px;
  position: relative;
  text-align: center;
  float: left;
  padding: 0 15px;
}
.nav ul li a {
  display: inline-block;
}
.nav ul li.active a::after {
  background-color: #fff;
  border: none;
  content: '';
  width: 2rem;
  height: 3px;
  background-color: #0096ff;
  margin: 0 auto;
  display: block;
}
.nav ul li.active a {
  color: #1e79ff;
}
.nav ul li a {
  font-size: 18px;
}
.gz_fb {
  width: 120px;
  float: right;
  text-align: center;
  height: 70px;
  margin-top: 10px;
}
.gz_fb a {
  display: inline-block;
  font-size: 14px;
  color: #666;
  line-height: 15px;
  position: relative;
}
.gz_fb a i {
  display: block;
  width: 42px;
  height: 42px;
  background: url(../images/video_icon.png) no-repeat;
}
.gz_fb .gozh {
  position: relative;
  margin-right: 10px;
}
.gz_fb .gozh i {
  background-position: center -60px;
}
.gz_fb .zhbt i {
  background-position: center -164px;
}

.gz_fb .gzh {
  z-index: 1;
  position: absolute;
  left: -30px;
  width: 100px;
  height: 100px;
  top: 60px;
  display: none;
}