.introduce .banner{
    width: 100%;
    height: 500px;
    object-fit: cover;
    background: url("../images/intro_bg.jpg") center center no-repeat;
}
.introduce .banner .txt{
    text-align: center;
    font-size: 60px;
    color: #fff;
    padding: 150px 0;
    text-shadow: #000 5px 5px 5px
}
.introduce .intro-title{
    padding: 50px 0;
    font-size: 30px;
    text-align: center;
}
.introduce .panel1.desc{
    line-height: 50px;
    font-size: 16px;
    color: #666;
    padding-bottom: 50px;
}
.introduce .panel2{
    width: 100%;
    height: 250px;
    object-fit: cover;
    background: url("../images/intro_bg2.png") center center no-repeat;
    text-align: center;
    padding: 100px 0;
    font-size: 30px;
    color: #fff;
    text-shadow: #000 5px 5px 5px
}
.introduce .qa{
    padding: 60px 0;
}
.introduce .question{
    background: url("../images/question.png") left center no-repeat;
    background-size: 30px 30px;
    padding-left: 50px;
    min-height: 40px;
    line-height: 40px;
    font-size: 18px;
    font-weight: bold;
}
.introduce .answer{
    background: url("../images/answer.png") left center no-repeat;
    background-size: 30px 30px;
    padding-left: 50px;
    min-height: 40px;
    line-height: 30px;
    margin-bottom: 20px;
    padding-top: 6px;
    color: #666;
}
.introduce .panel3{
    width: 100%;
    height: 250px;
    object-fit: cover;
    background: url("../images/intro_bg3.png") center center no-repeat;
    text-align: center;
    padding: 100px 0;
    font-size: 30px;
    color: #fff;
    text-shadow: #000 5px 5px 5px
}
.introduce .section4{
    padding: 40px 0;
}
.introduce .section4 .item{
    overflow: hidden;
}
.introduce .section4 .item .img{
    width: 700px;
}
.introduce .section4 .item .img img{
    width: 100%;
}
.introduce .section4 .left{
    float: left;
}
.introduce .section4 .right{
    float: right;
}
.introduce .section4 .item .txt{
    width: 400px;
}
.introduce .section4 .item .txt .tit{
    text-align: center;
    font-size: 20px;
    font-weight: bold;
    padding-top: 50px;
    padding-bottom: 20px;
}
.introduce .section4 .item .txt .desc{
    line-height: 35px;
    color: #666;
}