html, body {
    margin: 0;
    padding: 0;
    background:
            url("/w/images/body_bg_7.png") no-repeat center 137vw,
            url("/w/images/body_bg_6.png") no-repeat center 41.5vw,
            url("/w/images/body_bg_5.png") no-repeat center 19vw,
            url("/w/images/body_bg_3.png") no-repeat center 252.2vw,
            url("/w/images/body_bg_2.png") no-repeat 0 216vw,
            url("/w/images/body_bg_1.png") no-repeat 0 11.5vw;
    background-size: 48vw, 68vw, 88vw, 52vw, contain, contain;
    background-color: black;
}

html {
    display: none;
}

/***** 顶部栏 *****/
header {
    height: 11vw;
    overflow: hidden;
    box-sizing: border-box;
    position: sticky;
    top: 0;
    background-color: black;
    padding: 0.1vw 2vw;
    display: flex;
    justify-content: space-between;
    align-items: center;
    z-index: 100;
}

header > .logo {
    display: block;
    width: 25vw;
    height: 80%;
    margin-top: 1vw;
    background: url('/w/images/logo.png') no-repeat center center;
    background-size: contain;
}

header .bar-download-btn {
    width: 27vw;
    border-radius: 1vw;
    background-color: #FFDA77;
    text-align: center;
    font-size: 3.5vw;
    font-weight: bold;
    color: black;
    text-decoration: none;
    padding: 1vw 0;
    box-sizing: border-box;
    letter-spacing: 0.5vw;
    white-space: nowrap;
}

/***** 中间下载按钮 *****/
.middle-download-box {
    width: 100vw;
    margin-top: 18vw;
    display: flex;
    justify-content: center;
}

.middle-download-box > a {
    display: block;
    width: 75%;
}

.middle-download-box > a > img {
    width: 100%;
}

/***** 介绍块公共样式 *****/
.des-box {
    width: 100vw;
    overflow: hidden;
    display: flex;
    flex-direction: column;
    align-items: center;
    color: white;
}

.des-box .d-title {
    text-align: center;
    padding: 2vw 19vw;
    background: url("/w/images/des-box-title-bg.png") no-repeat 0 center;
    background-size: contain;
    font-size: 4vw;
    font-weight: bold;
}

.des-box .d-body {
    width: 100vw;
    overflow: hidden;
    margin-top: 3vw;
}

/***** 轮播图 *****/
#banner {
    width: 100vw;
    height: 41vw;
    position: relative;
}

#banner img {
    width: 48vw;
    position: absolute;
    top: 5vw;
    left: 0;
    transition: all .3s linear;
}

#banner .back {
    left: 52vw;
}

#banner .active {
    left: 25.5vw;
    transform: scale(1.5);
    z-index: 10;
}