.header {
  width: 100%;
  min-width: 1200px;
  position: relative;
  background: url("/pub/banner.jpg") no-repeat center top;
  background-size: auto;
  padding: 20px 0 100px;
  height: 422px;
  box-sizing: border-box;
}
.header .ipv {
  display: inline-block;
  margin-left: 10px;
  border-radius: 16px;
  padding: 0 12px;
  height: 24px;
  position: absolute;
  right: 10px;
  line-height: 24px;
  font-size: 14px;
  letter-spacing: 2px;
  top: 10px;
  background: #bf0e0e;
  color: #FFFFFF;
}
.header .logo {
  width: 1200px;
  margin: 46px auto;
}
.header .logo img {
  display: block;
}
.header .nav {
  background: #bf0e0e;
  width: 1200px;
  margin: 0 auto;
  height: 70px;
  border-radius: 40px;
}
.header .nav ul li {
  color: #ffffff;
  float: left;
  margin: 0 16px 0 26px;
  text-align: center;
  font-size: 24px;
}
.header .nav ul li a {
  line-height: 42px;
  display: block;
  padding: 0 30px;
  margin: 14px auto 0;
}
.header .nav ul li.active a {
  color: #bf0e0e;
  font-weight: bold;
  background: #FFFFFF;
  border-radius: 22px;
}
.header .nav .search {
  width: 334px;
  margin: 14px 20px 0 0;
}
.header .nav .search form {
  width: 334px;
  line-height: 42px;
  border: 1px solid #c9cbca;
  height: 42px;
  position: relative;
  background: #FFFFFF;
  border-radius: 22px;
  display: block;
}
.header .nav .search form input {
  height: 42px;
  font-size: 20px;
  display: block;
  text-indent: 14px;
  width: 300px;
  background: none;
}
.header .nav .search form button {
  position: absolute;
  right: 10px;
  z-index: 2;
  top: 5px;
  background: #FFFFFF;
  cursor: pointer;
  display: block;
}
@media (min-width: 1921px) {
  .header {
    background-size: 100% 100%;
  }
}