.header {
    position: fixed;
    z-index: 199;
    top: 0;
    left: 0;
    right: 0;
    width: 100%;
    min-width: 1200px;
    background-color: transparent;
    transition: all .3s ease;
}

.header-bg {
    background-color: #292f36;
    transition: all .3s ease;
}

.header-wrapper {
    width: 1200px;
    margin: 0 auto;
    height: 98px;
    display: -webkit-flex;
    display: flex;
    align-items: center;
    justify-content: space-between;
}

.header-logo {
    display: inline-block;
    margin-left: 10px;
    height: 68px;
    width: 240px;
    background: url(../images/logo.png) no-repeat left center;
    background-size: auto 68px;
    outline: none;
}

.header-nav-list {
    margin-right: 36px;
    display: -webkit-flex;
    display: flex;
}

.header-nav-list .nav-item {
    padding: 0 24px;
    display: inline-block;
    line-height: 98px;
}

.header-nav-list .nav-item a {
    display: block;
    color: #e0e0e0;
    font-size: 16px;
    outline: none;
    cursor: pointer;
}

.header-nav-list .nav-drop {
    position: relative;
}

.header-nav-list .nav-drop a {
    padding-right: 14px;
}

.header-nav-list .nav-drop:after {
    content: '';
    position: absolute;
    top: 44px;
    right: 24px;
    bottom: 0;
    width: 5px;
    height: 5px;
    border: 1px solid #fff;
    border-width: 1px 1px 0 0;
    transition: all .2s ease;
    transform: rotate(135deg);
    -webkit-transform: rotate(135deg);
}

.header-nav-list .nav-item-c {
    position: relative;
}

.header-nav-list .nav-item-c a {
    color: #fff;
}

.header-nav-list .nav-item-c a:after {
    content: '';
    position: absolute;
    bottom: 0;
    left: 0;
    right: 0;
    height: 2px;
    margin: 0 24px;
    background-color: #fff;
    opacity: .5;
}

.header-nav-list .nav-item a:hover {
    color: #fff;
}

.header-nav-list .nav-item:hover:after {
    top: 46px;
    transform: rotate(-45deg);
    -webkit-transform: rotate(-45deg);
}

.header-nav-list .nav-item-c:after {
    top: 46px;
    transform: rotate(-45deg);
    -webkit-transform: rotate(-45deg);
}

.header-nav-ext {
    display: none;
    position: absolute;
    top: 98px;
    left: 0;
    right: 0;
    width: 1200px;
    margin: 0 auto;
    background-color: #292f36;
}

.header-nav-ext.plan-ext {
    width: 384px;
    transform: translateX(408px);
    -webkit-transform: translateX(408px);
}

.header-nav-ext .nav-ext-content {
    box-sizing: border-box;
    display: -webkit-flex;
    display: flex;
    flex-wrap: wrap;
    width: 1200px;
    padding: 16px 24px;
    margin: 0 auto;
}

.header-nav-ext .nav-ext-content .ext-column {
    width: calc(20% - 32px);
    margin: 16px 0 16px 32px;
}

.header-nav-ext .nav-ext-content .ext-column .name {
    position: relative;
    margin-bottom: 12px;
    line-height: 16px;
    font-size: 16px;
    color: #fff;
}

.header-nav-ext .nav-ext-content .ext-column .name::before {
    position: absolute;
    content: '';
    width: 5px;
    height: 5px;
    background-color: #4373f9;
    left: -14px;
    top: 5px;
}

.header-nav-ext .nav-ext-content .ext-column .item {
    line-height: 26px;
    color: #717171;
}

.header-nav-ext .nav-ext-content .ext-column .item a {
    outline: none;
}

.header-nav-ext .nav-ext-content .ext-column .item:hover {
    color: #fff;
}

.header-nav-ext.plan-ext .nav-ext-content {
    flex-direction: column;
}

.header-nav-ext.plan-ext .nav-ext-content .ext-column {
    width: 100%;
}

.header-nav-ext .nav-ext-content .ext-column .active-item {
    color: #e0e0e0;
}