.header {
    width: 100%;
    height: 50px;
    position: relative;
    top: 0;
    left: 0;
    z-index: 200;
    min-width: 914px;
}
.jifentai{
    background: #fff;
}

.header .h-inner {
    width: 914px;
    height: 100%;
    margin: 0 auto;
    display: flex;
    align-items: center;
    padding: 0 10px;
}

.header .h-inner .logo {
    width: 72px;
    height: 32px;
    line-height: 50px;
    background: url('../../images/logo_white.png') no-repeat center center;
    background-size: 72px 32px;
}



.jifen-tai {
    transform: translate(-45%, 10%);
}

.jifen-tai img {
    background-repeat: no-repeat;
    background-position: 100% 100%;
    background-size: cover;
    height: 42px;
    background-color: #fff;
}

.header .nav {
    position: absolute;
    left: 30%;
    display: flex;
}
@media screen and (max-width: 1500px) {
    .header .nav {
        left: 25%;
    }
}
@media screen and (max-width: 1200px) {
    .header .nav {
        left: 15%;
    }
    .wrap .about_us .us_item {
    width: 100%!important;
    }
}

.header .nav a {
    text-decoration: none;
    padding: 0px 15px;
    line-height: 50px;
    margin: 0 20px;
    color: #fff;
    display: inline-block;
    position: relative;
}
.header.jifentai .nav a{
    color: #424242;
}
.header .nav a:hover {
    background-color: #157af8;
}
.header.jifentai .nav a:hover {
    background-color: rgba(0, 0, 0, .06);
}
.header.jifentai .nav a.active::after{
    background-color: #157af8;
}
.header.jifentai .nav a.active {
    color: #157af8;
}
.header .nav a.active::after {
    content: "";
    display: block;
    height: 2px;
    width: 100%;
    background-color: white;
    position: absolute;
    left: 0;
    bottom: 0;
}








/* 鼠标滚动后的样式 */
.header.sticky {
    position: fixed;
    background-color: #fff;
    box-shadow: 0px 0px 1px 0px #424242;
    animation: dropDown 1s ease-in-out forwards;

}

.header.sticky .h-inner .logo {
    background: url('../../images/logo_1.png') no-repeat center 0;
    background-size: 72px 32px;

}

.header.sticky .nav a {
    color: #424242;
}

.header.sticky .nav a:hover {
    background-color: rgba(0, 0, 0, .06);
}

.header.sticky .nav a.active {
    color: #157af8;
}

.header.sticky .nav a.active::after {
    content: "";
    display: block;
    height: 3px;
    width: 100%;
    background-color: #157af8;
    position: absolute;
    left: 0;
    bottom: -1px;
}


@keyframes dropDown {
    from {
        transform: translateY(-100px);
    }

    to {
        transform: translateY(0)
    }
}