html {
    font-size: 10px;
}


body {
    margin: 0;
}

.main {
    width: 100%;
    position: relative;
}

.main-box{
    width: 120rem;
    margin: auto;
    padding: 0 20px;
    box-sizing: border-box;
}

.flex-row{
    display: flex;
    flex-direction: row;
}

.flex-column{
    display: flex;
    flex-direction: column;
}

.nav {
    height: 7rem;
    position: sticky;
    top: 0;right: 0;left: 0;
    z-index: 10;
}

.nav-fixed{
    background: linear-gradient(44deg,#fcfcfd,rgba(252,252,253,.83));
    animation: nav 1s ease;
}

.nav-box{
    align-items: center;
    gap: 2rem;
}

.logo{
    width: auto;
    height: 4rem;
}

.btn-r{
    cursor: pointer;
    font-size: 1.4rem;
    padding: 1rem 2.4rem;
    border-radius: 3rem;
}

.btn-download{
    margin-left: auto;
    color: white;
    border: 1px solid white;
}

.btn-download-fixed{
    color: #16043f;
    border-color: #16043f;
}

.btn-login{
    color: #16043f;
    background-color: #fcd600;
}

.header {
    margin-top: -7rem;
    width: 100%;
    height: 56rem;
    background-color: #2fcac4;
    overflow: hidden;
}

.header-bg {
    width: 140rem;
    height: 100%;
    background-image: url(../images/header-bg.png);
    background-size: cover;
    background-position: center 80%;
    margin: auto;
}

.header-content {
    height: 100%;
    display: flex;
    flex-direction: column;
    justify-content: center;
    padding: 0 5rem;
}

.slogan {
    margin: 1rem 0;
    font-size: 3.8rem;
    color: white;
}

.slogan-img{
    display: none;
}

.desc{
    font-size: 1.8rem;
    color:white;
    width: 46rem;
    line-height: 1.6;
}

.btn-free{
    cursor: pointer;
    width: 18rem;
    margin-top: 3rem;
    color: #16043f;
    font-size: 2.8rem;
    background-color: #fcd600;
    padding: 1.5rem 3rem;
    border-radius: 1rem;
    display: flex;
    align-items: center;
    justify-content: center;
    gap: 1rem;
    position: relative;
}

.btn-free .iconfont{
    margin-top: .3rem;
    font-size: 3.2rem;
}

.tips{
    position: absolute;
    top: -32%; right: -6%;
    color: white;
    background-color: #f93a4a;
    font-size: 1.6rem;
    padding: .5rem 1rem;
    text-wrap: nowrap;
    border-radius: 3rem 3rem 3rem 0;
}

.platform-box{
    width: 100%;
    display: flex;
    background: linear-gradient(44deg,#fcfcfd,rgba(252,252,253,.83));
    margin-top: -4rem;
    border-radius: 3rem;
    padding: 2rem;
    box-sizing: border-box;
    height: 27rem;
    box-shadow: 0 2rem 3rem -.2rem hsla(0,0%,67.8%,.1);
}

.platform-item{
    flex: 1 0 calc(100%/5);
    color: #272e35;
    display: flex;
    flex-direction: column;
    align-items: center;
    justify-content: center;
    font-size: 1.8rem;
    font-weight: bold;
    border-radius: 2rem;
    gap: 0.5rem;
    position: relative;
    transition: all .3s;
}

.platform-item .iconfont{
    font-size: 3.6rem;
    font-weight: normal;
    color: #adb1b4;
}

.platform-item .name {
    margin-top: 1.5rem;
}

.platform-item .text{
    font-size: 1.4rem;
    border-radius: 1rem;
    padding: .8rem 5rem;
    color: #6d757c;
}

.platform-item:hover{
    cursor: pointer;
    background-color: #f0f0f0;
}

.platform-item:hover .iconfont{
    color: #6d757c;
}

.platform-item:hover .text{
    background-color: #37daae;
    font-size: 1.8rem;
    font-weight: lighter;
    color: white;
}

.QR-ios, .QR-android{
    opacity: 0;
}

.ios:hover .QR-ios{
    opacity: 1;
}

.android:hover .QR-android{
    opacity: 1;
}

.QR{
    position: absolute;
    pointer-events: none;
    top: -22rem;
    background-image: url(../images/border.png);
    background-size: 100% 100%;
    font-size: 1.4rem;
    color: #666;
    text-align: center;
    padding: 1rem;
    padding-bottom: 1.8rem;
    transition: all .5s;
    width: 16rem;
    box-sizing: border-box;
    z-index: 10;
}

.QR img{
    width: 100%;
    height: 100%;
}

.why-need-box{
    display: flex;
    flex-direction: column;
    align-items: center;
    padding-top: 5rem;
    padding-bottom: 15rem;
    box-sizing: border-box;
}

.title{
    font-size: 3.6rem;
    font-weight: normal;
    color: #272e35;
    margin: 1rem 0;
}

.sub{
    font-size: 1.6rem;
    font-weight: normal;
    color: #8a94a6;
    text-align: center;
}

.speed-list{
    display: flex;
    flex-wrap: wrap;
    width: 100%;
}

.speed-list-item{
    display: flex;
    flex-direction: column;
    align-items: center;
    flex: 1 0 calc(100%/4);
    padding: 2rem 5rem;
    box-sizing: border-box;
}

.speed-list-item .icon{
   width: 100%;
   height: auto;
}

.speed-list-item{
    font-size: 2.2rem;
    font-weight: normal;
    color: #272e35;
}

.feature{
    background-color: #f8f8fa;
}

.feature-box{
    display: flex;
    flex-direction: column;
    align-items: center;
    padding-top: 5rem;
    padding-bottom: 10rem;
}

.feature-list{
    margin-top: 5rem;
    display: flex;
    flex-wrap: wrap;
    gap: 4rem 0;
}

.feature-list-item{
    flex: 1 0 calc(100%/2);
    display: flex;
    align-items: center;
    padding: 2.5rem;
    box-sizing: border-box;
    gap: 1.2rem;
}

.feature-list-item:hover {
    cursor: pointer;
    background: linear-gradient(30deg, #fcfcfd, rgba(252, 252, 253, .83));
    border-color: #fcfcfd;
    box-shadow: 0 0 2rem hsla(0, 0%, 67.8%, .1);
    border-radius: 1.5rem;

}

.feature-name{
    font-size: 2rem;
    color: #272e35;
}

.feature-desc{
    margin-top: 1rem;
    font-size: 1.4rem;
    color: #8a94a6;
}

.vip-discount{
    width: 100%;
    height: 20rem;
    background-image: url("../images/discount-wrapper-pc.png");
    background-size: cover;
    background-position: center 80%;
}

.discount-box{
    display: flex;
    height: 100%;
}

.discount-slogan{
    margin: auto;
    display: flex;
    flex-direction: column; 
}

.discount-slogan .text{
    color: white;
    font-size: 4rem;
}

.discount-btn{
    cursor: pointer;
    margin: auto;
    background-color: #ff715b;
    color: white;
    font-size: 2rem;
    padding: 2rem 6rem;
    border-radius: 1rem;
}

.property{
    background-color: #f2fffa;
}

.property-list{
    display: flex;
    padding: 3rem 0 2rem 0;
}

.property-item{
    margin: auto;
    display: flex;
    align-items: center;
    gap: 1rem;
}

.property-item .icon{
    width: 3.5rem;
    height: 3.5rem;
}

.property-item .text{
    font-size: 1.8rem;
    color: #272e35;
}

.footer-infor{
    border-top: 1px solid #eee;
    color: #666;
    display: flex;
    flex-wrap: wrap;
    align-items: center;
    justify-content: center;
    gap: 1rem 1.5rem;
    padding: 2rem;
    font-size: 1.2rem;
}

.footer-infor a{
    text-decoration: none;
    color: #666;
}

.about{
    display: flex;
    flex-wrap: wrap;
    gap: 12rem;
    padding: 4rem 2rem;
}

.about a{
    color: #999;
    text-decoration: none;
}

.about-item{
    display: flex;
    flex-direction: column;
    gap: 2.5rem;
}

.about-child{
    display: flex;
    flex-direction: column;
    gap: 1.5rem;
}

.about-title{
    font-size: 1.6rem;
    color: #333;
}

.child-icon{
    width: 3.2rem;
}

.child-item{
    cursor: pointer;
    color: #999;
    font-size: 1.2rem;
    display: flex;
    align-items: center;
    gap: 10px;
    word-spacing: 1.2rem;
}

.child-item:hover{
    color: #555;
}

@media screen and (min-width: 1920px) {
    html{
        font-size: 11px;
    }
}

@media screen and (max-width: 1200px) {
    .main-box{
        width: 100%;
    }
    .property-list{
        width: 800px;
        flex-wrap: wrap;
        gap: 6rem 0;
        padding: 6rem 2rem;
    }
    .property-item{
        flex: 1 0 calc(100%/3);
        padding-left: 2vw;
        box-sizing: border-box;
    }
    .property-item .icon{
        width: 4rem;
        height: 4rem;
    }

    .about{
        gap: 0;
    }
    .about-item{
        margin: 0 auto;
    }
}


@media screen and (max-width: 1000px) {
    .header{
        height: 60rem;
    }
    .slogan-img{
        width: 40rem;
        display: block;
    }
    .slogan-text{
        display: none;
    }
    .platform .main-box{
        padding: 0;
    }
    .platform-box{
        margin: 0;
        padding: 1rem;
        height: 20rem;
        border-radius: 0;
    }

}

@media screen and (max-width: 800px) {
    .nav{
        height: 6rem;
    }
    .nav-box{
        gap: .8rem;
    }
    .btn-r{
        font-size: 1.2rem;
        padding: .7rem 1.6rem;
    }

    .header{
        margin-top: -6rem;
        height: 80rem;
    }
    .header-bg{
        background-image: url("../images/m-header-bg.png");
        background-position: bottom center;
    }
    .header-content{
        margin-top: 10rem;
        margin-bottom: auto;
        align-items: center;
        justify-content: start;
    }
    .slogan{
        text-align: center;
    }
    .desc{
        width: 100%;
    }
    .btn-free{
        width: 100%;
        max-width: 36rem;
        padding: 1.5rem 1rem;
        box-sizing: border-box;
    }

    .QR{
        width: 14rem;
        top: -20rem;
    }
    .platform-item{
        flex: 1 0 calc(100%/3);
    }
    .more-platform{
        display: none;
    }


    .why-need-box{
        padding-bottom: 5rem;
    }
    .speed-list-item{
        flex: 1 0 calc(100%/2);
        padding: 3vw 5vw;
    }


    .feature-box{
        padding-bottom: 5rem;
    }
    .feature-list-item{
        flex: 1 0 100%;
    }


    .property-list{
        width: 100%;
        justify-content: space-between;
    }
    .property-item{
        flex: 1 0 calc(100%/2);
        box-sizing: border-box;
        padding-left: 7vw;
        box-sizing: border-box;
    }


    .vip-discount{
        height: auto;
        padding: 30px 0;
    }
    .discount-box{
        flex-direction: column;
        gap: 2rem;
    }
    .discount-slogan{
        align-items: center;
    }
    .discount-slogan .text{
        font-size: 3rem;
    }
    .discount-btn{
        padding: 1rem 5rem;
    }

    .about{
        padding: 0;
    }
    .about-item{
        padding: 4rem;
        box-sizing: border-box;
        border-top: 1px solid #eee;
        flex: 1 0 100%;
        align-items: center;
    }
    .about-title{
        font-size: 2rem;
    }
    .child-item{
        margin: auto;
        font-size: 1.6rem;
        text-align: center
    }

    .child-icon{
        width: 4.4rem;
    }
}


@media screen and (max-width: 500px) {
    html{
        font-size: 9px;
    }
    .slogan-img{
        width: 100%;
        display: block;
    }
    .header-content{
        padding: 0;
    }
}



@keyframes nav {
    from{
        opacity: 0;
    }
    to{
        opacity: 1;
    }
}