.about-btit{
    position: relative;
    margin: 35px 0;
}
.about-btit img{
    width: auto;
    height: 70px;
}

.video-tit{
    position: absolute;
    top: 30px;
    left: 0;
}
.video-tit h1{
    font-size: 30px;
    font-weight: 600;
}
.video-tit p{
    font-size: 16px;
    margin-top: 10px;
}





.down-box{
    padding: 30px 0 100px;
}
.down-bul{
    display: flex;
    justify-content: space-between;
}
.down-bul li{
    width: 32%;

}
.down-bul li h3{
    font-size: 24px;
    font-weight: 600;
    padding-bottom: 10px;
}

.downb-ulitm{
    margin-top: 10px;
}
.downb-ulitm p{
    font-size: 14px;
    font-weight: 600;
    position: relative;
}
.downb-ulitm p img{
    width: 20px;
    height: 20px;
    cursor: pointer;
}
.downb-ulitm p:hover .prompt-txt{
    display: block !important;
}
.prompt-txt{
    width: 305px;
    height: 126px;
    position: absolute;
    top: 50%;
    left: 50px;
    transform: translateY(-50%);
    background-image: url("../images/picbj04.png");
    background-size: 100% 100%;
    display: none;
    font-size: 14px;
    font-weight: 500;
    padding: 20px 20px 20px 30px;
}
.downb-ulitm input{
    width: 100%;
    font-size: 14px;
    padding: 15px 20px;
    border: 1px solid #cccccc;
    background-color: #f5f5f5;
    border-radius: 5px;
    margin-top: 5px;
    
}

.downb-ulbtn{
    font-size: 16px;
    color: #ffffff;
    text-align: center;
    padding: 15px 0;
    background-color: #1a0e72;
    border-radius: 5px;
    margin-top: 20px;
}


.ulitm-language{
    display: flex;
    border: 1px solid #cccccc;
    background-color: #f5f5f5;
    border-radius: 5px;
    margin-top: 5px;
    overflow: hidden;
}
.language-txt{
    flex: 1;
    padding: 15px 20px;
    font-size: 14px;
}
.language-btn{
    width: 50px;
    height: 50px;
    cursor: pointer;
}
.language-btn img{
    width: 100%;
    height: 100%;
}


@media only screen and (max-width: 1400px) {
    .about-btit{
        margin: 30px 0;
    }
    .about-btit img {
        width: auto;
        height: 60px;
    }
    .video-tit{
        position: absolute;
        top: 25px;
        left: 0;
    }
    .video-tit h1{
        font-size: 26px;
    }
    .video-tit p{
        font-size: 14px;
        margin-top: 5px;
    }


    .down-box {
        padding: 25px 0 90px;
    }
    .down-bul li h3 {
        font-size: 20px;
        padding-bottom: 10px;
    }
    .downb-ulitm input {
        padding: 10px 15px;
    }
    .downb-ulbtn {
        font-size: 16px;
        padding: 10px 0;
        margin-top: 15px;
    }
    .language-txt {
        padding: 10px 15px;
    }
    .language-btn {
        width: 40px;
        height: 40px;
    }

}

@media only screen and (max-width: 769px) {
    .about-btit{
        margin: .3rem .1rem;
    }
    .about-btit img {
        width: auto;
        height: 50px;
    }
    .video-tit{
        position: absolute;
        top: .3rem;
        left: 0;
    }
    .video-tit h1{
        font-size: 20px;
    }
    .video-tit p{
        font-size: 12px;
        margin-top: .1rem;
    }


    .down-box {
        padding: .25rem .1rem .9rem;
    }
    .down-bul{
        flex-direction: column;
    }
    .down-bul li {
        width: 100%;
        margin-bottom: .3rem;
    }
    .downb-ulitm input {
        font-size: 14px;
        padding: .15rem .2rem;
        margin-top: 5px;
    }
    .downb-ulbtn {
        font-size: 14px;
        padding: .15rem 0;
        margin-top: .2rem;
    }

    .language-txt {
        padding: .15rem .2rem;
        font-size: 14px;
    }
    .language-btn {
        width: 37px;
        height: 37px;
    }



}