.p_width{
    width: 1300px;
    margin: auto;
}
.img_list{
    width: 70%;
    float: left;
}
.img_list .hd{
    width: 15%;
    float: left;
    /* padding-top: 70px; */
}
.img_list .hd ul li{
    width: 100px;
    height: 100px;
    margin-bottom: 40px;
    overflow: hidden;
    background: #ccc;
    cursor: pointer;
}
.img_list .hd ul li img{
    width: 100%;
}
.img_list .bd{
    width: 75%;
    float: left;
    position: relative;
}
.img_list .bd ul li{
    text-align: center;
}
.img_list .bd .prev{
    left: 30px;
}
.img_list .bd .next{
    right: 30px;
}

.description{
    width: 26%;
    height: 600px;
    float: right;
}
.clear{
    clear: both;
}
.description h4{
    padding-bottom: 30px;
    font-size: 24px;
}
.description h5{
    padding-bottom: 10px;
    font-size: 16px;
}
.description ul li{
    line-height: 30px;
    color: #666;
    font-size: 14px;
}
.video_content{
    width: 1000px;
    margin: auto;
}
.video_content .title{
    float: left;
    margin-top: 200px;
}
.video_content .title h4{
    font-size: 24px;
}
.video_content .video{
    width: 800px;
    height: 450px;
    float: right;
    margin-bottom: 50px;
}
.pdf{
    width: 1000px;
    margin: auto;
}
.pdf h4{
    text-align: center;
    padding-bottom: 30px;
    margin-top: 50px;
    font-size: 24px;
}
.pdf ul li{
    width: 50%;
    float: left;
    margin-bottom:100px;
}
.pdf ul li a{
    width: 220px;
    color: #000;
    font-size: 16px;
    height: 113px;
    line-height: 113px;
    background: url(../images/pdf.jpg) no-repeat;
    background-size: 100px;
    padding-left:130px;
    display: block;
    margin: auto;
}
@media screen and (max-width: 1080px) {
    .p_width{
        width: 100%;
        padding: 0 10px;
    }
    .description{
        width: 28%;
    }
    .video_content{
        width: 100%;
    }
    .video_content .title{
        width: 100%;
        float: none;
        text-align: center;
        margin-top: 20px;
        margin-bottom: 20px;
    }
    .video_content .video{
        width: 100%;
    }
    .pdf{
        width: 100%;
    }
}
@media screen and (max-width: 768px) {
    .img_list{
        width: 100%;
        padding: 0 30px;
    }
    .description{
        width: 100%;
        padding: 0 30px;
        height: 400px;
    }
}
@media screen and (max-width: 600px) {
    .img_list{
        padding: 0;
    }
    .img_list .hd{
        width: 100%;
    }
    
    .img_list .hd ul li{
        width: 25%;
        float: left;
        background: none;
        margin-bottom: 10px;
        text-align: center;
    }
    .img_list .bd{
        width: 100%;
    }
    .img_list .bd ul li img{
        max-width: 100%;
    }
    .description{
        padding: 0;
    }

}
@media screen and (max-width: 400px) {
    .video_content .video{
        height: 250px;
        margin-bottom: 0px;
    }
    .pdf ul li{
        padding: 0 30px;
    }
    .pdf ul li a{
        height: 60px;
        line-height: 60px;
        background-size: 50px;
        padding-left: 60px;
    } 
}