.menu-list a{
    color:white;
}
.menu-list a:hover{
    color: #fff;
}
.floor-one{
    width:100%;
    background: url('http://image.yhe-cloud.net/images/support-banner.png') no-repeat;
    background-size: 100% 100%;
    color:#fff;
}
.two-top{
    text-align: center;
}
.floor-three{
    width: 100%;
    background: url('http://image.yhe-cloud.net/images/download.png') no-repeat;
    background-size: 100% 100%;
    color:#fff;
    text-align: center;
}
/* 屏幕小于480 */
@media screen and (max-width: 480px) {
}
/* 屏幕大于 375 小于 900px */
@media screen and (min-width: 375px) and (max-width: 900px) {
    .floor-one{
        height: 270px;
        background: url('http://image.yhe-cloud.net/images/support-banner-m.png') no-repeat;
        background-size: 100% 100%;
    }
    .one-left{
        padding:120px 100px 0;
    }
    .one-left > b:first-child{
        font-size: 60px;
        font-weight: 700;
    }
    .one-left > b:nth-child(2){
        font-size: 40px;
        font-weight: 400;
        margin-top: 10px;
    }
    .one-left > div:last-child{
        font-size: 20px;
    }
    .two-top{
        margin-top: 60px;
    }
    .two-top b{
        font-size: 24px;
font-weight: 500;
letter-spacing: -1px;
line-height: 32px;
color: #007CC2;
        /* margin:10px 0; */
    }
    .two-top p{
        font-size: 16px;
font-weight: 500;
letter-spacing: 0px;
line-height: 20px;
color: #007CC2;
        margin:10px 0;
    }
    .two-bottom{
        padding: 10px 30px;
    }
    .two-b-text{
        display: flex;
        flex-flow: wrap;
        align-items: center;
        padding:10px 0;
        border-bottom: 1px solid #ddd;
    }
    .two-b-text span:first-child{
        font-size: 16px;
        font-weight: 400;
        letter-spacing: -0.5px;
        line-height: 32px;
        color: #007CC2;
    }
    .two-b-text span:last-child{
display: none;
    }
    .two-b-text b{
        font-size: 16px;
        padding: 20px;
letter-spacing: -1px;
line-height: 32px;
color: rgba(29, 38, 58, 1);
    }
    .two-b-text p{
        font-size: 12px;
font-weight: 400;
line-height: 18px;
color: rgba(38, 39, 41, 1);
margin:0;
padding-left:40px;
    }
    .floor-three{
        height: 280px;
        margin-top: 50px;
        background: url('http://image.yhe-cloud.net/images/download-m.png') no-repeat;
        background-size: 100% 100%;
    }
    .three-top >b:first-child{
        font-size: 30px;
font-weight: 700;
letter-spacing: -1px;
line-height: 30px;
    }
    .three-top >b:nth-child(2){
        font-size: 18px;
font-weight: 700;
letter-spacing: -1px;
line-height: 30px;
        padding: 10px 50px;
    }
    .three-bottom p{
        font-size: 18px;
        font-weight: 400;
        letter-spacing: 0px;
        line-height: 32.93px;
        margin: 0;
        cursor: pointer;
    }
}
/* 屏幕大于 1200px */
@media screen and (min-width: 901px) {
    .floor-one{
        height: 380px;
    }
    .one-left{
        padding:120px 100px 0;
    }
    .one-left > b:first-child{
        font-size: 60px;
        font-weight: 700;
    }
    .one-left > b:nth-child(2){
        font-size: 40px;
        font-weight: 400;
        margin-top: 10px;
    }
    .one-left > div:last-child{
        font-size: 20px;
    }
    .two-top{
        margin-top: 100px;
    }
    .two-top b{
        font-size: 50px;
letter-spacing: -1px;
line-height: 70px;
color: #007CC2;
        margin-top:10px;
    }
    .two-top p{
        font-size: 36px;
font-weight: 500;
line-height: 56px;
color: #007CC2;
        margin-bottom:10px;
    }
    .two-bottom{
        padding: 10px 200px;
    }
    .two-b-text{
        display: grid;
        grid-template-columns: 70px 300px 600px auto;
        align-items: center;
        padding:30px 0;
        border-bottom: 1px solid #ddd;
    }
    .two-b-text span:first-child{
        font-size: 24px;
font-weight: 400;
letter-spacing: -0.5px;
line-height: 36px;
color: #007CC2;
    }
    .two-b-text span:last-child{
        width: 30px;
        /* height: 5px; */
        border: 4px solid #007CC2;
        margin:0 auto;
        border-radius: 5px;
    }
    .two-b-text b{
        font-size: 24px;
letter-spacing: -1px;
line-height: 36px;
color: rgba(29, 38, 58, 1);
    }
    .two-b-text p{
        font-size: 16px;
font-weight: 400;
line-height: 24px;
color: rgba(38, 39, 41, 1);
margin:0;
    }
    .floor-three{
        height: 440px;
        margin-top: 50px;
    }
    .three-top >b:first-child{
        font-size: 50px;
font-weight: 700;
letter-spacing: -1px;
line-height: 60px;
    }
    .three-top >b:nth-child(2){
        font-size: 24px;
font-weight: 700;
letter-spacing: -1px;
line-height: 60px;
        padding: 10px 50px;
    }
    .three-bottom p{
        font-size: 24px;
        font-weight: 400;
        letter-spacing: 0px;
        line-height: 32.93px;
        margin: 10px 0;
        cursor: pointer;
    }
}