.vedio-bg {
    width: 100%;
    height: 100vh;
    min-height: 410px;
    top: 0;
    left: 0;
    object-fit: cover;
    object-position: 50% 50%;
}

.site {
    position: relative;
}

.cover {
    background: rgba(51, 112, 255, 0.1);
    position: absolute;
    width: 100%;
    height: 100%;
    text-align: center;
    top: 0;
}

.cover-chinese {
    font-size: 54px;
    font-weight: 800;
    color: #ffffff;
    margin-top: 32vh;
    letter-spacing: 2px;
}

.cover-english {
    font-size: 16px;
    font-weight: lighter;
    color: rgba(255, 255, 255, 0.8);
    position: relative;
    letter-spacing: 11px;
}

.cover-english::before {
    content: "";
    display: inline-block;
    height: 2px;
    width: 100px;
    position: absolute;
    z-index: 10;
    top: 9px;
    left: 50%;
    margin-left: -244px;
    background: linear-gradient(to left, rgba(255, 255, 255, 1), rgba(255, 255, 255, 0));
}

.cover-english::after {
    content: "";
    display: inline-block;
    height: 2px;
    width: 100px;
    position: absolute;
    z-index: 10;
    top: 9px;
    right: 50%;
    margin-right: -244px;
    background: linear-gradient(to right, rgba(255, 255, 255, 1), rgba(255, 255, 255, 0));
}

.cover-btn {
    margin-top: 7vh;
}

.cover-btn a {
    font-size: 15px;
    display: inline-block;
    height: 56px;
    line-height: 56px;
    width: 150px;
    background: rgba(255, 255, 255, 0.8) url(../img/more.png) no-repeat 112px 16px;
    color: #4f4f4f;
    text-decoration: none;
    border-radius: 40px;
    -webkit-border-radius: 40px;
    -o-border-radius: 40px;
    -ms-border-radius: 40px;
    position: relative;
}

.cover-btn a::after {
    content: "观看完整视频";
    position: absolute;
    left: 20px;
}

.vedio-navbox {
    position: absolute;
    z-index: 10;
    width: 100%;
    left: 0;
    top: 20px;
}

.vedio-nav {
    width: 1200px;
    margin: 0 auto;
}

.vedio-nav img {
    float: left;
}

.vedio-nav ul {
    float: right;
    overflow: hidden;
}

.vedio-nav ul li {
    float: left;
    overflow: hidden;
    margin: 0 20px;
    height: 30px;
}

.vedio-nav ul li a {
    color: #ffffff;
    font-size: 16px;
    text-decoration: none;
    padding-bottom: 5px;
    border-bottom: 2px solid transparent;
}

.vedio-nav ul li a:hover {
    color: rgba(255, 255, 255, 0.4);
}

.nav-active a {
    font-weight: bold;
    border-bottom: 2px solid #ffffff !important;
}

.banner-mobile,
.mobile-logo,
.close-menu,
.menu {
    display: none;
}

@media screen and (max-width: 992px) {

    .vedio-bg,
    .pc-logo {
        display: none;
    }

    .banner-mobile,
    .mobile-logo,
    .menu,
    .close-menu {
        display: block;
    }

    .banner-mobile img {
        width: 100%;
    }

    .mobile-logo {
        width: 85px;
        position: absolute;
        left: 10px;
        top: 15px;
    }

    .menu-bg {
        background: rgba(0, 0, 0, 0.3);
        position: fixed;
        width: 100%;
        z-index: 10;
        top: 48px;
        height: 100%;
    }

    .close-menu,
    .menu {
        position: absolute;
        right: 10px;
        top: 15px;
    }

    .close-menu img {
        width: 15px;
    }

    .menu img {
        width: 20px;
    }

    .vedio-navbox {
        background: #ffffff;
        top: 0;
    }

    .vedio-nav {
        width: 100%;
        position: relative;
        height: 48px;
    }

    .vedio-nav ul {
        position: absolute;
        top: 0;
        background: #ffffff;
        width: 100%;
    }

    .vedio-nav ul li {
        border-top: 1px solid #eeeeee;
        float: none;
        padding: 10px 0;
        margin: 0;
        height: auto;
    }

    .vedio-nav ul li a {
        color: #323232;
        background: url(../img/narrow.png) no-repeat calc(100% - 10px) center;
        background-size: 8px;
        display: block;
        padding: 0 0 0 10px;
    }

    .nav-active a {
        background: #ffffff;
    }

    .vedio-nav ul li a:hover {
        background: url(../img/narrow.png) no-repeat calc(100% - 10px) center;
        background-size: 8px;
        color: #323232;
    }

    .cover-english::before {
        margin-left: -90px;
        width: 40px;
        top: 4px;
    }

    .cover-english::after {
        margin-right: -90px;
        width: 40px;
        top: 4px;
    }

    .cover-btn a::after {
        font-size: 11px;
        left: 10px;
    }

    .cover-chinese {
        font-size: 16px;
        margin-top: 11vh;
    }

    .cover-english {
        font-size: 8px;
        margin-top: 0;
        letter-spacing: 4px;
    }

    .slide1mobile {
        padding-top: 0 !important;
        padding-bottom: 0;
    }

    .cover-btn {
        margin-top: 1.4vh;
    }

    .cover-btn a {
        height: 24px;
        line-height: 24px;
        background: rgba(255, 255, 255, 0.8) url(../img/more.png) no-repeat 78px 5px;
        background-size: 14px;
        width: 100px;
    }

    .box {
        width: 100%;
        height: 48px;
        background: #fff;
        box-sizing: border-box;
    }

    .back {
        font-size: 16px;
        font-weight: bold;
        color: #323232;
        height: 48px;
        line-height: 48px;
        padding: 0;
        margin: 0;
        background: url(../img/narrow-back.png) no-repeat 10px center;
        background-size: 8px;
        padding-left: 20px
    }
}