.header {
    position: relative;
    top: 0;
    left: 0;
    width: 1200px;
    height: 80px;
    background-color: #fff;
    color: #fff;
    line-height: 80px;
    z-index: 100;
    margin: 0 auto;
}

.header h1 {
    float: left;
    font-size: 32px;
    font-weight: 400;
}

.header .nav {
    float: right;
    height: 100%;
    line-height: 80px;
    background: transparent;
}

.nav-logo {
    width: 203px;
    height: 38px;
}

.header .nav-item {
    float: left;
    position: relative;
    cursor: pointer;
}

.header .nav-item a {
    text-decoration: none;
    color: #2A2A2A;
    opacity: .5;
    display: block;
    padding: 0 22px;
}

.header .nav-item a:hover {
    opacity: 1;
}

.dropdown-menu {
    transform-origin: center top;
    z-index: 2055;
    display: none;
}

.dropdown-menu-active {
    display: block;
    transform-origin: center top;
    z-index: 2057;
    position: absolute;
    top: 66px;
    left: 1285px;
    background-color: #fff;
}

.header .nav-item-hidden a {
    opacity: 1;
}

.nav-item-child {
    display: none;
    background: #FFF;
    border-radius: 4px;
    margin-top: 4px;
}

.nav-item-hidden .nav-item-child {
    display: block;
}

.header .nav-item .nav-item-child li a {
    display: block;
    line-height: 40px;
    color: #2A2A2A;
    opacity: 1;
}

.nav-item-child li {
    padding: 4px 0;
}

.nav-item-hidden li a:hover {
    background: #ecf5ff;
}
.header .nav-item-active a {
    opacity: 1;
}

.nav-item-child .nav-item-child-active a {
    background: #ecf5ff;
}