/* 导航栏 */
.nav {
  position: fixed;
  width: 100%;
  top: 0;
  height: 0.96rem;
  z-index: 10;
  background: url("../imgs/nav.png") no-repeat center top;
  display: flex;
  justify-content: space-evenly;
  background-size: cover;
}

.nav .logo {
  width: 22.3rem;
  height: 2.2rem;
  background: url("../imgs/logo.png") no-repeat center top;
  background-size: cover;
}

.nav .item {
  width: 100%;
  height: 100%;
  position: relative;
  font-size: 0;
}

.nav .item a {
  display: block;
  height: 0.35rem;
  width: 100%;
  font-size: 0;
  overflow: hidden;
  text-indent: -999rem;
  position: absolute;
  top: 0;
  bottom: 0;
  margin: auto;
}

.nav .item .n1 {
  background: url("../imgs/sy.png") no-repeat center;
  background-size: auto 100%;
}

.nav .item .n2 {
  background: url("../imgs/zx.png") no-repeat center;
  background-size: auto 100%;
}

.nav .item .n3 {
  background: url("../imgs/da.png") no-repeat center;
  background-size: auto 100%;
}

.nav .item .n4 {
  background: url("../imgs/dsj.png") no-repeat center;
  background-size: auto 100%;
}

.nav .item .n5 {
  background: url("../imgs/yy.png") no-repeat center;
  background-size: auto 100%;
}

.nav .item .nap {
  height: 0.5rem;
  background: url("../imgs/nav_nap.png") no-repeat center;
  background-size: auto 100%;
}

.nav .item .n1.active {
  background: url("../imgs/sy-dianji.png") no-repeat center;
  height: 1.4rem;
  background-size: auto 100%;
  margin: 0;
}

.nav .item .n2.active {
  background: url("../imgs/zx-dianji.png") no-repeat center;
  height: 1.4rem;
  background-size: auto 100%;
  margin: 0;
}

.nav .item .n3.active {
  background: url("../imgs/da-dianji.png") no-repeat center;
  height: 1.4rem;
  background-size: auto 100%;
  margin: 0;
}

.nav .item .n4.active {
  background: url("../imgs/dsj-dianji.png") no-repeat center;
  height: 1.4rem;
  background-size: auto 100%;
  margin: 0;
}

.nav .item .n5.active {
  background: url("../imgs/yy-dianji.png") no-repeat center;
  height: 1.4rem;
  background-size: auto 100%;
  margin: 0;
}