.clear {
    clear: both;
    font-size: 0px;
    height: 0px;
    overflow: hidden;
}

.clearfix:after {
    content: ".";
    display: block;
    height: 0;
    clear: both;
    visibility: hidden;
}

.clearfix {
    display: inline-block;
}

.clearfix {
    display: block;
}

.wrap {
    margin: 0 auto;
    clear: both;
    width: 100%;
    text-align: left;
}

    .wrap:after {
        clear: both;
        content: ".";
        display: block;
        height: 0;
        visibility: hidden;
    }

.n_banner .txt {
    margin-top: 140px;
    width: 100%;
    height: 300px;
    color: #fff;
    position: absolute;
    left: 0;
    top: 0;
    z-index: 2;
    display: -webkit-box;
    display: -webkit-flex;
    display: -ms-flexbox;
    display: flex;
    -webkit-box-pack: center;
    -webkit-justify-content: center;
    -ms-flex-pack: center;
    justify-content: center;
    -webkit-box-align: center;
    -webkit-align-items: center;
    -ms-flex-align: center;
    align-items: center;
    -webkit-box-orient: vertical;
    -webkit-box-direction: normal;
    -webkit-flex-direction: column;
    -ms-flex-direction: column;
    flex-direction: column;
}

    .n_banner .txt b.t {
        display: block;
        font-size: 46px;
        line-height: 46px
    }

        .n_banner .txt b.t:after {
            content: "";
            display: block;
            width: 40px;
            height: 2px;
            line-height: 2px;
            background-color: #f08300;
            margin: 20px auto;
        }


    .n_banner .txt p {
        display: block;
        margin-bottom: 0;
        font-size: 16px;
        line-height: 16px;
        letter-spacing: 6px
    }

.boxwrap {
    width: 88%;
    margin: 0 auto;
}

@media (max-width:900px) {
    .n_banner .txt {
        margin-top: 100px;
        height: 160px;
    }

        .n_banner .txt b.t {
            display: block;
            font-size: 34px;
            line-height: 34px
        }

        .n_banner .txt p {
            font-size: 14px;
            line-height: 14px;
        }

    .boxwrap {
        width: 90%;
        margin: 0 auto;
    }
}


@media (max-width:500px) {
    .n_banner .txt {
        margin-top: 70px;
        height: 130px;
    }

        .n_banner .txt b.t {
            display: block;
            font-size: 32px;
            line-height: 32px
        }

        .n_banner .txt p {
            font-size: 14px;
            line-height: 14px;
        }

    .boxwrap {
        width: 90%;
        margin: 0 auto;
    }
}

.tit {
    padding-bottom: 20px;
    padding-top: 50px;
}

@media (max-width:500px) {
    .tit {
        padding-bottom: 10px;
        padding-top: 30px;
    }
}

    .tit h3 {
        color: #333;
        font-size: 25px;
        line-height: 30px;
        text-align: center
    }

.entry {
    font-size: 15px;
    line-height: 2.2em;
    word-wrap: break-word;
    color: #5a5a5a;
    margin-top: 15px;
}

.banner_product {
    background: url(../img/banner_bg.jpg?v=2) no-repeat top center;
    height: 400px;
    width: 100%;
}

.banner_video {
    background: url(../img/banner_bg.jpg?v=2) no-repeat top center;
    height: 400px;
    width: 100%;
}

.banner_download {
    background: url(../img/banner_bg.jpg?v=2) no-repeat top center;
    height: 400px;
    width: 100%;
}

.banner_about {
    background: url(../img/banner_bg.jpg?v=2) no-repeat top center;
    height: 400px;
    width: 100%;
}


@media (max-width:900px) {
    .banner_product {
        height: 230px;
    }

    .banner_video {
        height: 230px;
    }

    .banner_datum {
        height: 230px;
    }

    .banner_about {
        height: 230px;
    }
}

@media (max-width:500px) {
    .banner_product {
        height: 180px;
    }

    .banner_video {
        height: 180px;
    }

    .banner_datum {
        height: 180px;
    }

    .banner_about {
        height: 180px;
    }
}
.about_pic {
    width: 100%;
    height: auto;
    overflow: hidden;
    margin: 10px auto;
}

    .about_pic li {
        width: 25%;
        height: auto;
        overflow: hidden;
        float: left;
    }

@media (max-width:900px) {
    .about_pic li {
        width: 33.33333%;
        height: auto;
        overflow: hidden;
        float: left;
    }
}

.about_pic li .img {
    width: 95%;
    border: 1px solid #cccccc;
    padding: 3px;
    margin: 0 auto 10px auto;
}