* {
    padding: 0;
    margin: 0;
    border: 0;
}

.n_case {
    position: relative;
    display: block;
    width: 24.8%;
    float: left;
    width: 24.7%\9;
    border-bottom: 10px solid #fff;
    border-right: 2px solid #fff;
    overflow: hidden;
    font-size: 1em;
    text-align: center;
    background: #FFFFFF;
}

    .n_case:hover .cover {
        display: block;
    }

    .n_case p {
        font-size: 1em;
        text-align: center;
        line-height: 32px;
        font-family: "microsoft yahei";
    }

.case_w {
    position: relative;
}

    .case_w > img {
        display: block;
        width: 100%;
    }

.n_case .cover a {
    display: block;
    width: 100%;
    height: 100%;
    background: url(404.png) no-repeat center;
}

.cover {
    position: absolute;
    width: 100%;
    height: 100%;
    background: rgba(0,0,0,0.7);
    left: 0;
    top: 0;
    display: none;
}

.f24 {
    font-size: 24px;
    font-family: "microsoft yahei";
    line-height: 34px;
    text-align: center;
}

.f14 {
    font-size: 14px;
    font-family: "microsoft yahei";
    line-height: 22px;
    text-transform: capitalize;
    text-align: center;
}


.cover_v {
    position: fixed;
    width: 100%;
    height: 100%;
    z-index: 888;
    background: rgba(0,0,0,0.5);
    left: 0;
    top: 0;
    display: none;
}

.video_d {
    width: 800px;
    height: 600px;
    position: absolute;
    left: 50%;
    margin-left: -400px;
    top: 15%;
    z-index: 999;
    background: #949494;
    display: none;
}

    .video_d > div video {
        padding: 20px;
    }

.v_tt {
    height: 40px;
    line-height: 40px;
    font-size: 16px;
    text-align: center;
    padding: 0 15px;
    background: #fff;
    color: #000;
    font-family: "microsoft yahei";
}

.cls {
    float: right;
    margin-top: 5px;
}

.video-js .vjs-big-play-button {
    background: url(404.png) no-repeat center !important;
    border: none !important;
    width: 75px !important;
    height: 75px !important;
    left: 50% !important;
    top: 50% !important;
    margin-left: -37px;
    margin-top: -37px;
    opacity: 0.6 !important;
}

    .video-js .vjs-big-play-button:hover {
        opacity: 1 !important;
    }

    .video-js .vjs-big-play-button::before {
        content: "" !important;
    }

.video-jssy {
    width: 800px;
    height: 450px;
}

.bainian {
    padding: 0;
    position: fixed;
    top: 50%;
    left: 50%;
    margin-left: -400px;
    margin-top: -250px;
    width: 800px;
    height: auto;
    z-index: 99999;
}

@media screen and (max-width:1200px) {
    .n_case {
        width: 24.5%;
    }
}

@media screen and (max-width:960px) {
    .n_case {
        width: 49.5%;
    }
    .cover {
    display:block;}
}

@media screen and (max-width:642px) {
    .n_case {
        width: 49.5%;
    }

    .v_case_z img {
        width: 33% !important;
    }

    .bainian {
        width: 500px;
        margin-left: -250px;
        height: 310px;
    }

    .video-jssy {
        width: 500px;
        height: 280px;
    }
}