/***
 * about styles
 **/
.about-content{
    max-width: 1440px;
    margin: 80px auto;
    font-family: Arial, Arial;
    font-size: 16px;
    color: #333333;
    line-height: 30px;
}
.about-content .about_title{
    font-family: Arial, Arial;
    font-weight: bold;
    font-size: 42px;
    color: #333333;
    line-height: 42px;
    text-align: center;
    font-style: italic;
}
.about-content .top_content{
    margin-top: 60px;
    display: flex;
}
.about-content .top_content .top_left_content{
    max-width: 750px;
    display: grid;
    align-content: center;
}
.about-content .top_content .top_left_content .top_left_content_title{
    font-family: Arial, Arial;
    font-weight: bold;
    font-size: 30px;
    color: #333333;
    line-height: 30px;
    font-style: italic;
}
.about-content .top_content .top_left_content .top_left_content_text{
    margin-top: 30px;
}
.about-content .top_content .top_right_content{
    width: 630px;
    height: 296px;
    margin-left: 60px;
}
.about-content .top_content .top_right_content img{
    width: 100%;
    height: 100%;
}
.about-content .middle_content{
    margin-top: 60px;
}
.about-content .bottom_content{
    margin-top: 60px;
    display: flex;
}
.about-content .bottom_content .bottom_left_content{
    width: 630px;
    height: 353px;
}
.about-content .bottom_content .bottom_left_content img{
    width: 100%;
    height: 100%;
}
.about-content .bottom_content .bottom_right_content{
    margin-left: 60px;
}
.about-content .bottom_content .bottom_right_content .bottom_right_content_title{
    font-family: Arial, Arial;
    font-weight: bold;
    font-size: 30px;
    color: #333333;
    line-height: 30px;
    font-style: italic;
}
.about-content .bottom_content .bottom_right_content .bottom_right_content_text{
    margin-top: 30px;
}
.about-content .bottom_content .bottom_right_content .bottom_right_content_text .bottom_right_content_text_title{
    font-weight: bold;
    font-size: 18px;
}


/**
* choose  styles
***/
.choose-warp{
    width: 100%;
    margin: 80px auto 0;
    padding: 80px 0;
    background: #F3F2F9;
}
.choose-warp .choose{
    max-width: 1440px;
    margin: 0 auto;
}
.choose .choose-title{
    font-family: Arial, Arial;
    font-weight: bold;
    font-size: 42px;
    color: #333333;
    line-height: 42px;
    text-align: center;
    font-style: italic;
}
.choose .choose-desc{
    font-family: Arial, Arial;
    font-size: 18px;
    color: #333333;
    line-height: 27px;
    text-align: center;
    margin-top: 20px;
    padding: 0 100px;
}
.choose .choose-list{
    display: flex;
    flex-wrap: wrap;
    justify-content: space-around;
    margin-top: 30px;
}
.choose .choose-list .choose-item{
    width: 460px;
    height: 400px;
    background-color: #FFFFFF;
    margin-top: 30px;
    padding: 30px;

}
.choose .choose-list .choose-item .choose-item-icon{
    width: 50px;
    height: 50px;
    margin-top: 50px;
    overflow: hidden;
}
.choose .choose-list .choose-item .choose-item-icon img{
    width: 100%;
    height: 100%;
    transition: transform 1s ease;
}
.choose .choose-list .choose-item .choose-item-icon img.rotated {
    transform: rotateY(360deg);
}
.choose .choose-list .choose-item .choose-item-title{
    font-family: Arial, Arial;
    font-weight: bold;
    font-size: 30px;
    color: #333333;
    line-height: 30px;
    margin-top: 40px;
}
.choose .choose-list .choose-item .choose-item-desc{
    font-family: Arial, Arial;
    font-size: 16px;
    color: #333333;
    line-height: 30px;
    margin-top: 30px;
}
.choose .choose-list .choose-item.active{
    background: #2980D3;
}
.choose .choose-list .choose-item.active .choose-item-title,
.choose .choose-list .choose-item.active .choose-item-desc{
    color: #FFFFFF;
}

/**
 * certificate styles
 ***/
.certificate{
    max-width: 1440px;
    margin: 80px auto;
}
.certificate .certificate-title{
    font-family: Arial, Arial;
    font-weight: bold;
    font-size: 42px;
    color: #333333;
    line-height: 42px;
    text-align: center;
    font-style: italic;
}
.certificate .certificate-list{
    margin-top: 60px;
    display: flex;
    flex-wrap: wrap;
    max-width: 100%;
}
.certificate .certificate-list .certificate-item{
    margin: 10px 7px;
    cursor: pointer;
    width: 274px;
    height: 387px;
}
.certificate .certificate-list .certificate-item img{
    width: 100%;
    height: 100%;
}