html {
    max-height: 100vh;
}

body {
    background: url('../images/background.png') no-repeat;
    background-size: cover;
    width: 400px;
    margin: 0 auto;
    min-height: 100vh;
    position: relative;
    font-family: 微软雅黑;
}

.Logo {
    padding-top: 15vh;
    text-align: center;
    color: #fff;
    font-size: 38px;
    letter-spacing: 5px;
}

    .Logo p {
        margin: 4.4vh 0;
    }

.system {
    margin-top: 30vh;
    text-align: center;
    display: none;
}

    .system > p {
        margin: 3vh 0;
    }

.dl {
    background: url('../images/btn01.png') no-repeat center top;
    display: block;
    height: 60px;
    padding-top: 10px;
    color: #fff;
}

    .dl p {
        margin: -5px;
    }

     .dl + span {
        display: none;
    }

footer {
    color: #fff;
    text-align: center;
    font-family: 微软雅黑;
    margin-top: 3vh;
}

    footer p {
        margin: 10px 0;
        font-size: 8px;
    }

.weixin_top {
    position: fixed;
    top: 0;
    left: 0;
    background: url(../images/wx_tip.png) no-repeat right top rgba(0,0,0,0.8);
    width: 100vw;
    height: 100vh;
    background-size: 80%;
    display: none;
}

@media screen and (max-width :1024px) {
    body {
        background-image: url('../images/background-ipad.png');
    }

    .Logo {
        /*padding-top: 10vh;*/
        font-size: 28px;
        letter-spacing: 3px;
    }

        .Logo .word {
            width: 120px;
        }

    .system {
        margin-top: 25vh;
    }

    footer {
        margin-top: 7vh;
    }

        footer p {
            margin: 10px 0;
            font-size: 16px;
        }
}

@media screen and (max-width :450px) {
    body {
        background-image: url('../images/background-iphone.png');
        width: 100%;
    }

    .Logo {
        padding-top: 15vh;
        font-size: 20px;
        letter-spacing: 2px;
    }

        .Logo .logoimg {
            width: 89px;
        }

        .Logo .word {
            width: 75px;
        }

    .systemicon {
        width: 40px;
    }

    .dl {
        transform: scale(0.7);
    }

    footer {
        margin-top: 5vh;
    }

        footer p {
            font-size: 10px;
        }
}

@media screen and (max-width: 320px) {
    footer {
        margin-top: 2vh;
    }
}