html {
    font-size: calc(100vw / 37.5);
}

body{
    margin: 0 auto;
    background-color: #120f0a;
    background-image: url("../img/img_download_bg.png");
    background-size: cover;
    background-position: center;
    background-repeat: no-repeat;
    height: 100vh; 
}

* {
    margin: 0;
    padding: 0;
}

img {
    max-width: 100%;
    vertical-align: top;
}
.box {
    margin: 0 auto;
    padding-top: 2rem;
}

.w-flex {
    display: flex;
    align-items: center;
    justify-content: center; /* 如果需要，可以居中對齊 */
}

.menu-box {
    margin: 3rem auto;
    position: absolute;
    left: calc(50% - 12rem);
    height: 4.8rem;
}

.btn {
    margin: 0 auto;
    width: 23rem;
    height: 5.2rem;
    background: linear-gradient(90deg, #8b0310 0%, #6e0107 100%);
    border:2px solid  #f9d04e;
    border-radius: 0.9rem;
}

.icon {
    width: 2rem;
    height: 2.4rem;
    margin: 1.4rem 1rem 1.4rem 0rem; /* 控制图标和文字之间的间距 */
}

a {
    align-items: center;
    justify-content: center;
    display: flex; /* 使用 flex 布局 */
    font-size: 1.4rem;
    color: #f9d04e;
    white-space: nowrap; /* 防止文字换行 */
    text-align: center; /* 在 flex 布局中，文本居中对齐 */
    text-decoration: none;
}


.swiper-box {
    width: calc(100vw - 4rem);
    height: calc(calc(100vw - 4rem) * 0.477);
    margin: 0 auto;
    background-color: #FFF;
    border-radius: 0.6rem;
    position: relative;
    overflow: hidden;
}
.swiper-box .swiper-item {
    width: calc(100vw - 4rem);
    height: calc(calc(100vw - 4rem) * 0.477);
    position: absolute;
    top: 0;
    left: 0;
    z-index: 1;
    opacity: 0;
    transition: left .3s;
}
.swiper-item img {
    width: 100%;
    height: 100%;
}
.logo-box {
    width: 100%;
    margin: 4rem auto 0;
    display: flex;
    flex-direction: column;
    align-items: center;
}
.logo-box img {
    width: 15rem;
    height: 15rem;
}
.logo-label {
    margin-top: 0.8rem;
    color: #fff;
    font-size: 2.4rem;
    font-weight: bold;
}

.service {
    /* 使img元素居中 */
    display: flex;
    align-items: center;
    justify-content: center;

    /* 设置按钮的位置 */
    position: fixed;
    left: 0.5rem;
    bottom: 42%;
    z-index: 9999;
}
.service img{
    width: 5.2rem;
}

.service_back{
    width: 5.2rem;
    text-align: center;
    visibility: hidden;
    /* 使img元素居中 */
    display: flex;
    align-items: center;
    justify-content: center;

    /* 设置按钮的位置 */
    position: fixed;
    left: 0.5rem;
    bottom: 50%;
    z-index: 9999;
    /*
    阴影
     */
}

.tutorial{
    margin: 0 auto;
    background-color: #120f0a;}

.kefu_tip{
    width: 5.2rem;
    /* 使img元素居中 */
    display: flex;
    align-items: center;
    justify-content: center;

    /* 设置按钮的位置 */
    position: fixed;
    right: 0.5rem;
    bottom: 42%;
    z-index: 9999;
}