* {
    margin: 0;
    padding: 0;
    box-sizing: border-box;
    font-family: Microsoft YaHei, Microsoft YaHei-Regular, serif;
}

::-webkit-scrollbar {
    display: none;
}

img {
    object-fit: cover !important;
}

body {
    min-width: 1200px;
    overflow-x: hidden;
}

.header {
    background: #343751;
    box-shadow: -2px 0 6px 2px rgba(27, 24, 23, 0.20);
    font-size: 0;
}

.header > div {
    height: 80px;
    width: 1200px;
    margin: 0 auto;
    display: flex;
    justify-content: space-between;
}

.header .logo,
.header .menu,
.header .menu li,
.header .help,
.header .help li {
    display: inline-block;
    vertical-align: top;

}

.header .logo {
    width: 183px;
    padding-top: 24px;
}

.header .menu {
    width: 1000px;
}

.header .menu li {
    width: 90px;
    margin: 0 17px;
    font-size: 18px;
    font-weight: 400;
    text-align: center;
    line-height: 80px;
    /*padding: 0 3px;*/
    position: relative;
}

.header .menu li a {
    color: #ffffff;
    text-decoration: none;
}

.header .menu li::after,
.header .menu li.selected::after {
    content: "";
    width: 0;
    height: 3px;
    background: #fff;
    position: absolute;
    bottom: 0;
    left: 0;
    transition: all .3s;
    opacity: 0;
}

.header .menu li.selected::after,
.header .menu li:hover::after {
    width: 100%;
    opacity: 1;
}

.header .menu li:hover .children {
    opacity: 1;
    transform: translateY(0);
    display: block;
}

.header .menu li .children {
    display: none;
    opacity: 0;
    width: 100px;
    position: absolute;
    top: 80px;
    left: -5px;
    transition: all .3s;
    overflow: hidden;
    z-index: 100;
    padding-top: 5px;
    transform: translateY(-10px);
}

.header .menu li dl {
    width: 100%;
    font-size: 14px;
    box-shadow: 0 2px 4px rgba(0, 0, 0, .12);
    border: 1px solid #eee;
    line-height: 36px;
    padding: 5px 0;
    background-color: #fff;
    border-radius: 2px;
}

.header .menu li dd {
    padding: 0 5px;
    white-space: nowrap;
    overflow: hidden;
    text-overflow: ellipsis;
    cursor: pointer;
}

.header .menu li dd a {
    color: black;
}

.header .menu li dd:hover {
    background-color: #eee;
}

.header .help {
    width: 180px;
    font-size: 12px;
    color: #9c9c9c;
    font-family: SimSun, SimSun-Regular, serif;
}

.header .help li {
    line-height: 80px;
    margin-right: 10px;
}

.header .help li a {
    color: #9c9c9c;
    text-decoration: none;
}


.footer {
    width: 100%;
    background: #343751;
}

.footer .b1 {
    width: 1200px;
    padding: 44px 0px;
    margin: 0 auto;
}

.footer .b1 ul {
    text-align: center;
}

.footer .b1 ul li {
    display: inline-block;
    font-size: 16px;
    font-weight: 400;
    color: #ffffff;
    margin-right: 32px;
    line-height: 32px;
}

.footer .b1 ul li a {
    font-size: 16px;
    font-weight: 400;
    color: #ffffff;
}

.footer .b1 ul li a:hover {
    color: #b9c0df;
    font-weight: bold;
}

.footer .b2 {
    height: 42px;
    line-height: 42px;
    border-top: 1px solid #40435B;
    font-size: 14px;
    font-weight: 400;
    color: #909090;
    text-align: center;
}

.footer .b2 a {
    color: #909090;
}