html,
body {
  position: relative;
  width: 100%;
  height: auto;
  font-size: 16px;
  font-family: "Microsoft YaHei";
}
/*版心*/
.w1280 {
  width: 1280px;
  margin: 0 auto;
}
/*头部*/
header {
  width: 100%;
  height: 115px;
  background: url(../images/nav_bg.png) no-repeat;
  background-size: 100% 100%;
  border-bottom: 6px solid #1b8dd2;
}
header .nav {
  display: flex;
  justify-content: space-between;
  align-items: center;
  height: 100%;
}
header .nav li {
  width: 259px;
  height: 74px;
  background: url(../images/nav_icon.png) no-repeat;
}
header .nav li:hover {
  background: url(../images/nav_icon_on.png) no-repeat;
}
header .nav li a {
  display: flex;
  justify-content: center;
  align-items: center;
  width: 100%;
  height: 100%;
  color: #ffffff;
  font-size: 24px;
  letter-spacing: 2px;
}
header .nav .nav_active {
  background: url(../images/nav_icon_on.png) no-repeat;
}
/*banner*/
.banner {
  width: 100%;
}
.banner img {
  width: 100%;
  height: 100%;
}
/*内容*/
article {
  position: relative;
  width: 100%;
  background: url(../images/bg.png) center top no-repeat;
  background-size: 100%;
}
article .content {
  position: relative;
  padding-top: 59px;
  padding-bottom: 206px;
  z-index: 1;
}
article .content .title {
  width: 100%;
  text-align: center;
}
article .content .center {
  margin: 56px auto 0;
  width: 1276px;
  height: 899px;
  background: url(../images/index_content.png) no-repeat;
}
article .foot {
  position: absolute;
  left: 0;
  bottom: 0;
  width: 100%;
}
article .foot img {
  width: 100%;
}
/*版权*/
footer {
  display: flex;
  justify-content: center;
  align-items: center;
  width: 100%;
  height: 107px;
  color: #fff;
  font-size: 14px;
  background: url(../images/foot_bg.png) no-repeat;
  background-size: 100%;
}