body{ overflow: hidden;}
.swiper-container {
    width: 100%;
    height: 100%;
}
.swiper-slide {
    text-align: center;
    background: #fff;
    color: #000;
    display: flex;
    justify-content: center;
    align-items: center;
    position: relative;
}

.ball{
    --ball-size:260px;
    --ball-margin:-130px;
}
.ball>div{ position: fixed; z-index: 2; top: 50%; transform: translateY(var(--ball-margin)); }
.ball>div{ width: var(--ball-size); height:var(--ball-size); border-radius: 50%; background-color: #222; color: #FFF; display: flex; justify-content: center; align-items: center; flex-direction: column; opacity: 0;}
.ball>div span:nth-child(1){ font-size: 50px;}
.ball>div span:nth-child(2){ font-family: futurastd-light; font-size: 28px; text-transform: uppercase;}
.ball1{  right: 50%; margin-right: var(--ball-margin);}
.ball2{  left: 50%; margin-left: var(--ball-margin);}
.ball3{  left: 50%; margin-left: var(--ball-margin);}


/* slide 1 */
.text-gray{ color: #DDD; font-size: 8vw; font-family: 'futurastd-light'; position: absolute; left: 100px; top: 0; z-index: 2;}
.content-group-btn{ display: flex; justify-content: center;}
.content-group-btn a{ display: block;  background-color: var(--bg-green); padding: 8px 20px; margin: 0 10px ; color: #000; font-size: 20px;}
.content-group-btn a:hover{ background-color: #000; color: var(--bg-green);}
.content-group-btn2{ position: fixed; left: 0; bottom: 0; width: 100%;}
.about1 .content-group-btn{ margin-top: 50px;}

.about1{ width: 80%; max-width: 1000px; margin-left: auto; margin-right: auto;}
.about1 .content p:nth-child(1){ font-size: 22px; color: #777;}
.about1 .content p:nth-child(2){ font-size: 36px; font-weight: bold;  margin-top: 20px;}
.about1 .content p:nth-child(3){ font-size: 22px; color: #777; margin-top: 20px;}

.btn-next, .btn-next2{ position: absolute; left: 0; bottom: 0; width: 100%; text-align: center;}
.btn-next a, .btn-next2 span{ font-size: 28px; display: inline-block; position: relative; color: #000; padding-bottom: 10px; font-family: futurastd-bold;}
.btn-next a::after, .btn-next2 span::after{ content: ''; width: 100%; position: absolute; left: 0; bottom: 0; border-bottom: 5px solid #000;}
.btn-next1::after{ content: ''; display: block; width: 100%; height: 40px; background-color: #e4e2e4; background-image: url(../images/about1-footer.jpg); background-repeat: no-repeat; background-position: top right; background-size: auto 15px;}
.btn-next2{ bottom: auto; top: 20px;}


/* slide 2 */
.about-2 .item{ margin-top: 40px; color: #777;}
.about-2 .item:nth-child(1){ margin-top: 0;}
.about-2 .item p:nth-child(1){ font-size: 40px;}
.about-2 .item p:nth-child(2){ font-size: 18px;}

@media screen and (max-width: 1400px) {
    .ball{
        --ball-size:220px;
        --ball-margin:-110px;
    }
}

@media screen and (max-width: 640px) {
    body{ overflow: visible;}
    .text-gray {
        font-size: 60px;
        line-height: 60px;
        position: relative;
        left: 0;
        top: 0;
        padding: 100px 0 50px 20px;
    }
    .text-gray i{ display: block;}
    .swiper-slide {
        display: block;
    }
    .ball{
        --ball-size:100px;
        --ball-margin:-50px;
    }
    .ball>div{ transform: translateY(var(--ball-margin)); }
    .ball>div span:nth-child(1){ font-size: 30px;}
    .ball>div span:nth-child(2){  font-size: 14px; }

    .about1 {
        width: auto;
        margin-left: 20px;
        margin-right: 20px;
        text-align: left;
        padding-bottom: 50px;
    }

    #intro_line2 span{ display: block;}
    .about1 .content p:nth-child(1){ font-size: 22px;}
    .about1 .content p:nth-child(2){ font-size: 22px; padding: 20px 0;}
    .about1 .content p:nth-child(3) {
        font-size: 18px;
        margin-top: 0;
    }
    .btn-next1{ display: none;}
    .about1 .content-group-btn {
        margin-top: 50px;
        width: 100%;
        overflow: hidden;
    }
    .content-group-btn a {
        padding: 8px 0;
        margin: 0 0 0 10px;
        flex: 1;
        font-size: 16px;
        text-align: center;
    }
    .content-group-btn a:nth-child(1){ margin-left: 0;}

    .swiper-container{ height: auto;}
    .swiper-wrapper {
        position: relative;
        width: 100%;
        height: auto;
        display: block;
    }

    /* slide2 */
    .about-2{ padding: 0 20px;}
    .btn-next2 {
        position: relative;
        top: 0;
        margin-top: 50px;
    }
    .btn-next a, .btn-next2 span {
        font-size: 22px;
        padding-bottom: 10px;
    }
    .about-2 .item p:nth-child(1) {
        font-size: 22px;
    }
    .about-2 .item p:nth-child(2) {
        font-size: 16px;
    }
    .about-2 .item{ margin-top: 30px;}
    .about-2 .item:nth-child(1) {
        margin-top: 30px;
    }
    .content-group-btn2 {
        position:relative;
        width: auto;
        padding: 20px 20px 50px 20px;
    }

    
    
}

/* 横屏 */
@media screen and (max-width: 980px) and (orientation: landscape) {
    .ball {
        --ball-size: 100px;
        --ball-margin: -50px;
    }
    .ball>div span:nth-child(1) {
        font-size: 20px;
    }
    .ball>div span:nth-child(2) {
        font-size: 16px;
    }
    .text-gray {
        font-size: 18px;
    }
    .about1 .content p:nth-child(1) {
        font-size: 16px;
    }
    .about1 .content p:nth-child(2) {
        font-size: 18px;
        margin-top: 10px;
    }
    .about1 .content p:nth-child(3) {
        font-size: 14px;
        margin-top: 10px;
    }
    .about1 .content-group-btn {
        margin-top: 20px;
    }
    .content-group-btn a {
        padding: 4px 10px;
        margin: 0 10px;
        font-size: 14px;
    }
    .btn-next a, .btn-next2 span {
        font-size: 18px;
        padding-bottom: 3px;
    }
    .btn-next1::after {
        height: 20px;
        background-size: auto 15px;
    }
    .about-2 .item p:nth-child(1) {
        font-size: 12px;
    }
    .about-2 .item:nth-child(1) {
        font-size: 14px;
        padding: 0 40px;
     }
     .about-2 .item {
        margin-top: 10px;
    }
    .about-2 .item p:nth-child(2) {
        font-size: 14px;
    }
    .ball>div.ball1{ margin-right: 30px !important;}


}