* {
    margin: 0;
    padding: 0;
    box-sizing: border-box;
    line-height: 1.5em;
}

.clearfix:after {
    content: "";
    display: block;
    visibility: hidden;
    clear: both;
}

ul,
li {
    list-style: none;
}

h3 {
    margin-top: 0
}

a:hover,
a:link {
    text-decoration: none
}

html {
    font-size: 16px;
}

body {
    background: #eee;
}

.common-head {
    background: #fff;
    z-index: 10;
    padding: .2rem 2%;
    /*  border-bottom: 1px solid #b2c0cd; */
    box-shadow: 0 5px 10px -5px;
    position: fixed;
    left: 0;
    top: 0;
    width: 100%;
    box-sizing: border-box;
}

.common-head .back-btn {
    float: left;
    height: 4rem;
    padding: 0 !important;
}

.common-head .back-btn a {
    display: inline-block;
    width: .5rem;
    height: 100%;
    background: url(../img/back.png) center no-repeat;
    background-size: 100%;
}

.common-head h1 {
    text-align: center;
    font-weight: normal;
    font-size: 1.6rem;
    padding: 0 !important;
    color: #495565;
    margin: 0;
    line-height: 4rem;
}

.banner {
    margin-top: 4rem;
}

.banner img {
    width: 100%;
    height: auto;
}

.menu {
    margin-bottom: 5rem;
    overflow: auto
}

.menu a {
    margin: 1rem 1.5%;
    display: block;
    text-align: center;
    box-sizing: border-box;
    background: #fff;
}

.menu a img {
    height: 25%;
    width: auto;
    margin: 25% 0 15%;
}

.menu a span {
    display: block;
    color: #4a5265;
    font-size: 1rem;
}


.content-box {
    padding: 0 2%;
    margin-top: 5rem;
}

.download-list li {
    border-radius: 5px;
    margin: 1rem 0;
    padding: 1rem 0;
    background: #fff;
}

.download-list li p {
    font-size: 1.5rem;
    color: #495565;
}

.download-list li span {
    color: #999;
    font-size: 0.8rem;
    display: block;
}

.download-list li i {
    float: right;
    width: .5rem;
    height: 2.2rem;
    background: url(../img/eye.png) center no-repeat;
    background-size: 100% 100%;
    margin-right: 1rem;
}

.question-list li {
    border: 1px solid #b2c0cd;
    border-radius: 5px;
    margin: 1rem 0;
    padding: 1rem;
}

.question-list li a {
    color: #495565;
    font-size: 1.5rem;
}

.question-list li p {
    color: #485367;
    margin-top: 1.2rem;
    font-size: 1.2rem;
}

.content-details {
    border: 1px solid #b2c0cd;
    border-radius: 5px;
    margin: 1rem 0;
    padding: 0.5rem;
    background: #fff;
}

.content-details a {
    color: #495565;
    font-size: 1.2rem;
    display: block;
    padding-bottom: .5rem;
    font-weight: bold;
    letter-spacing: 1px;
}

.content-details section {
    color: #485367;
    margin-top: 1.2rem;
    font-size: 1.0rem;
    letter-spacing: 1px;
}

.content-details p {
    margin-bottom: 0px !important;
}

.video-list li {
    /* border-bottom: 1px solid #b3bfcd; */
    margin-bottom: 1rem;
    padding: 1rem 5px;
    line-height: 1.5em;
    box-sizing: border-box;
    background: #fff;
}

.video-list li a {
    color: #485365;
}

.video-list li img {
    width: 100%;
    height: auto;
    border-radius: .3rem;
}

.video-list li h3 {
    margin: 5px 0;
    font-size: 1.2rem;
    line-height: 2rem;
    height: 2rem;
    color: #333;
    word-break: break-all;
    text-overflow: ellipsis;
    overflow: hidden;
    white-space: nowrap
}

.video-list li p {
    font-size: 1rem;
    margin-bottom: 1rem;
    /* height:3em; */
    overflow: hidden;
    text-overflow: ellipsis;
    /* word-break:break-all */
}

.video-list li span {
    font-size: .8rem;
    color: #b3bfcf;
}

.videowrapper {
    display: none;
    width: 80vmin;
    height: 60vmin;
    position: fixed;
    left: 50%;
    top: 50%;
    transform: translate(-50%, -50%);
    box-shadow: 0 0 10px 0 #ccc;
    z-index: 999;
    background: #000;
}

.videowrapper i {
    position: absolute;
    width: 1.8rem;
    right: -0.6rem;
    top: -0.6rem;
}

.videowrapper i img {
    width: 100%;
    height: auto;
}

.videowrapper span {
    opacity: 0;
    padding: 5px;
    position: absolute;
    top: 45%;
    left: 0;
    width: 100%;
    text-align: center;
    background: #000;
    color: #fff;
    font-weight: bold;
    z-index: 999;
}

.chs-btn {
    position: fixed;
    left: 0;
    bottom: 0;
    width: 100%;
    background: #fff;
    z-index: 999;
}

.chs-btn .cap {
    height: 5rem;
    line-height: 5rem;
    text-align: center;
    font-size: 1.2rem;
    background: #fff;
}

.chs-btn .cap i {
    position: absolute;
    margin-left: 15px;
    width: 1rem;
    height: 5rem;
    background: url(../img/unfold.png) center/contain no-repeat;
    transition: background .5s ease;
}

.chs-btn .choose-box {
    text-align: center;
    height: 0;
    overflow: hidden;
}

.chs-btn .choose-box a {
    color: #485365;
    display: block;
    line-height: 3em;
    font-size: 1.2rem;
    border-top: 1px solid #eee;
}

.overlay {
    position: absolute;
    z-index: 11;
    top: 0;
    right: 0;
    left: 0;
    bottom: 0;
    background: rgba(0, 0, 0, .3);
    display: none
}







@media (min-width: 320px) {
    html {
        font-size: 12px;
    }

    .menu a {
        width: 30%;
        float: left;
        height: 35vw;
        border-radius: 5%;
    }
}

@media (min-width: 360px) {
    html {
        font-size: 14px;
    }

    .menu a {
        width: 30%;
        float: left;
        height: 30vw;
        border-radius: 5%;
    }
}


@media (min-width: 768px) {
    html {
        font-size: 24px;
    }

    .video-list li h3 {
        margin-top: 0;
    }

}