html,body{
    width: 100%;
    height: 100%;
    margin: 0;
}
ul{
    list-style: none;
    margin: 0;
    padding: 0;
}
a {
    text-decoration: none;
}
.clearfix::before,
.clearfix::after{
    display: table;
    content: " ";
}
.clearfix::after{
    clear: both;
    height: 0;
    font-size: 0;
    visibility: hidden;
}
.header{
    text-align: center;
    position: relative;
}
.bg-img{
    width: 100%;
    height: auto;
}
.to-link{
    position: absolute;
    left: calc(50%   15px);
    bottom: 20%;
    cursor: pointer;
}
.contents{
    font-family: microsoftyahei;
}
.how-do{
    text-align: center;
    margin-bottom: 60px;
}
.how-title{
    height: 50px;
    margin: 116px 0 90px 0;
    font-size: 36px;
    font-weight: 600;
    color: #333333;
    line-height: 50px;
    font-family: pingfangsc-semibold, pingfang sc;
}
.how-desc{
    width: 1200px;
    margin: auto;
}
.hr{
    display: block;
    width: 98%;
    margin: 0 auto 52px auto;
}

.explain-use {
    width: 100%;
    background: #fafafa;
    text-align: center;
}
.explain {
    display: flex;
    flex-direction: column;
    width: 100%;
    background: #fafafa;
    text-align: center;
}

.explain-inner {
    width: 1200px;
    margin: auto;
    padding-top: 60px;
}

.explain-text {
    width: 560px;
}

.explain-title {
    height: 50px;
    margin: 0 0 60px;
    font-size: 36px;
    font-weight: 600;
    color: #333333;
    line-height: 50px;
    font-family: pingfangsc-semibold, pingfang sc;
}

.explain-sub-title {
    height: 28px;
    font-size: 20px;
    font-family: pingfangsc-regular, pingfang sc;
    font-weight: 400;
    color: #666973;
    line-height: 28px;
}

.explain-content {
    font-size: 18px;
    font-weight: 400;
    color: #666666;
    /*line-height: 40px;*/
    margin-bottom: 0;
}

.left-line span {
    display: block;
    /* height: 50px; */
    font-size: 18px;
    font-family: pingfangsc-regular, pingfang sc;
    font-weight: 400;
    color: #666973;
    line-height: 25px;
}

.left-line .list-title {
    position: relative;
    height: 25px;
    padding-left: 14px;
    margin-bottom: 10px;
    font-size: 18px;
    font-family: pingfangsc-semibold, pingfang sc;
    font-weight: 600;
    color: #333333;
    line-height: 25px;
}

.list-title:before {
    width: 4px;
    height: 18px;
    background: #0098e8;
    font-size: 16px;
    font-family: pingfangsc-semibold, pingfang sc;
    font-weight: 600;
    color: #333333;
    line-height: 22px;
}

.list-pan {
    width: 340px;
    height: 75px;
    font-size: 16px;
    font-family: pingfangsc-semibold, pingfang sc;
    font-weight: 600;
    color: #666973;
    line-height: 22px;
    margin-bottom: 30px;
}

.explain-text a {
    color: #1b85d5;
}

.explain-img {
    /*float: right;*/
    /* margin-top: 86px; */
    width: 548px;
    height: 464px;
}
.use {
    background-color: #fff;
}

.use-img {
    width: 584px;
}

.call-card-scene{
    padding-top: 36px;
    padding-bottom: 1px;
    box-sizing: border-box;
    background-color: #fafafa;
}
.call-card-title{
    height: 50px;
    margin: 0 0 26px;
    font-size: 36px;
    font-weight: 600;
    color: #333333;
    line-height: 50px;
    text-align: center;
}
.call-card-inner{
    /*display: flex;*/
    /*justify-content: space-between;*/
    width: 1200px;
    margin: auto;
}
.online-scene,
.off-scene {
    display: flex;
    justify-content: center;
    align-items: center;
    margin-bottom: 20px;
}

.line {
    width: 130px;
    height: 1px;
    background: #333333;
}

.text {
    height: 33px;
    font-size: 24px;
    margin: 0 22px;
    font-weight: 600;
    color: #333333;
    line-height: 33px;
}
.scene-explain{
    display: flex;
    justify-content: space-between;
    margin-bottom: 50px;
}

.card{
    position: relative;
    width: 375px;
    height: 265px;
    padding: 30px 15px 15px 40px;
    background: #ffffff;
    border: 1px solid #dadcdf;
    box-sizing: border-box;
}

.card-title{
    height: 28px;
    margin: 0 0 20px 0;
    font-size: 20px;
    font-weight: 600;
    color: #1b85d5;
    line-height: 28px;
}
.card-desc{
    width: 290px;
    height: 50px;
    margin: 0 0 30px 0;
    line-height: 25px;
    font-size: 18px;
    font-weight: 400;
    color: #666666;
}
.card-img{
    position: absolute;
    right: 15px;
    bottom: 15px;
}

.smart .explain-text{
    color: #666666;
}
.smart .explain-text span{
    color: #333333;
    font-weight: 600;
}
.smart .explain-img{
    margin-top: 50px;
}


.explain-inc {
    padding: 40px 0;
    text-align: center;
}

.explain-inc h3 {
    height: 44px;
    margin-top: 0;
    margin-bottom: 60px;
    font-size: 36px;
    font-family: pingfangsc-semibold, pingfang sc;
    font-weight: 600;
    color: #333333;
    line-height: 50px;
}
.explain-inc img{
    width: 285px;
    margin: 0 7px;
}

.explain-inca {
    padding: 42px 0;
    text-align: center;
    background-color: #fafafa;
}

.explain-inca h3 {
    margin-top: 0;
    margin-bottom: 50px;
    font-size: 40px;
    font-family: pingfangsc-semibold, pingfang sc;
    font-weight: 600;
    color: #666973;
}

.explain-inca>div {
    margin: auto;
    width: 1200px;
    display: flex;
    flex-wrap: wrap;
    justify-content: space-between;
}

.explain-inca img {
    width: 380px;
    margin-bottom: 30px;
}