.product_desc{
    font-size: 16px;
    color: #666666;
    text-align: center;
    margin-top: 60px;
}

.product-list{
    max-width: var(--iw);
    margin: 10px auto 100px;
    display: flex;
    flex-wrap: wrap;
    flex-direction: row;
    width: 100%;
}
.product-item{
    width: 24%;
    margin-right: 1.33%;
    margin-top: 50px;
}
.product-item:nth-child(4n){
    margin-right: 0;
}
.product-item.visible {
    opacity: 0;  /* 动画开始前仍为透明 */
    animation: fadeInUp 0.8s ease-out forwards;
    animation-fill-mode: backwards;
}
@keyframes fadeInUp {
    0% {
        opacity: 0;
        -webkit-transform: translate3d(0,100%,0);
        transform: translate3d(0,100%,0)
    }

    to {
        opacity: 1;
        -webkit-transform: translateZ(0);
        transform: translateZ(0)
    }
}
.product-item .product-item-image{
     width: 100%;
     border: 1px solid #DBDBDB;
 }
.product-item .product-item-image img{
    width: 100%;
    transition: all 0.3s ease-in-out;
}
.product-item .product-item-title{
    font-weight: bold;
    font-size: 20px;
    color: #000000;
    text-align: center;
    margin-top: 20px;
}
.product-item .product-item-intro{
    font-size: 16px;
    color: #666666;
    text-align: center;
    margin-top: 20px;
    overflow: hidden;
    display: -webkit-box;
    -webkit-line-clamp: 4;
    -webkit-box-orient: vertical;
}
.product-item .product-item-more{
    font-size: 16px;
    color: #999999;
    line-height: 20px;
    text-align: center;
    margin-top: 30px;
}
.product-item .product-item-more a{
    color: #999999;
}
.product-item:hover .product-item-image img{
    transform: scale(1.05);
}
.product-item:hover .product-item-more a{
    color: #3ABD71;
}
.product-item.visible {
    opacity: 1;
    transform: translateY(0);
}
.product-item:nth-child(4n+2) { animation-delay: 0.1s; }
.product-item:nth-child(4n+3) { animation-delay: 0.2s; }
.product-item:nth-child(4n) { animation-delay: 0.3s; }



@media only screen and (min-width: 1000px) and (max-width: 1400px) {
    .product_desc{
        font-size: 14px;
        margin-top: 40px;
    }
    .product-list{
        margin-bottom: 80px;
    }
    .product-item{
        width: 32%;
        margin-top: 40px;
        margin-right: 2%;
    }
    .product-item:nth-child(4n) {
        margin-right: 2%;
    }
    .product-item:nth-child(3n) {
        margin-right: 0;
    }
    .product-item .product-item-title{
        font-size: 18px;
        margin-top: 15px;
    }
    .product-item .product-item-intro{
        font-size: 14px;
        margin-top: 15px;
    }
    .product-item .product-item-more{
        font-size: 14px;
        margin-top: 20px;
    }
}
@media only screen and (min-width: 768px) and (max-width: 1000px) {
    .product_desc{
        font-size: 14px;
        margin-top: 40px;
    }
    .product-list{
        margin-bottom: 60px;
    }
    .product-item{
        width: 49%;
        margin-top: 30px;
        margin-right: 2%;
    }
    .product-item:nth-child(2n) {
        margin-right: 0;
    }
    .product-item .product-item-title{
        font-size: 16px;
        margin-top: 10px;
    }
    .product-item .product-item-intro{
        font-size: 12px;
        margin-top: 10px;
    }
    .product-item .product-item-more{
        font-size: 12px;
        margin-top: 10px;
    }
}
@media only screen and (max-width: 768px){
    .product_desc{
        font-size: 14px;
        margin-top: 40px;
    }
    .product-list{
        margin-bottom: 40px;
    }
    .product-item{
        width: 49%;
        margin-top: 30px;
        margin-right: 2%;
    }
    .product-item:nth-child(2n) {
        margin-right: 0;
    }
    .product-item .product-item-title{
        font-size: 16px;
        margin-top: 10px;
    }
    .product-item .product-item-intro{
        font-size: 12px;
        margin-top: 10px;
    }
    .product-item .product-item-more{
        font-size: 12px;
        margin-top: 10px;
    }
}




.advantage-wrap{
    max-width: var(--iw);
    margin: 100px auto 0;
}
.advantage{
    margin: 60px auto 0;
    display: flex;
    align-items: center;
    justify-content: space-between;
}
.advantage .advantage-image{
    width: 49%;
}
.advantage .advantage-content{
    width: 49%;
}
.advantage .advantage-content .advantage-title{
    font-weight: bold;
    font-size: 24px;
    color: #000000;
}
.advantage .advantage-content .advantage-desc{
    font-size: 16px;
    color: #666666;
    margin-top: 20px;
}
.advantage-list{
    display: flex;
    flex-wrap: wrap;
    justify-content: space-between;
}
.advantage-list .advantage-item{
    width: 32%;
    margin-top: 80px;
    background: #F7F7F7;
    padding: 0 30px 30px;
}
.advantage-list .advantage-item .advantage-item-img{
    width: 80px;
    height: 80px;
    margin: -40px auto 0;
}
.advantage-list .advantage-item .advantage-item-img img{
    width: 100%;
    height: 100%;
    transition: transform .5s ease-in-out;
}
.advantage-list .advantage-item:hover .advantage-item-img img{
    transform: rotateY(180deg);
}
.advantage-list .advantage-item .advantage-item-title{
    font-weight: bold;
    font-size: 20px;
    color: #000000;
    text-align: center;
    margin: 30px 0 20px;
}
.advantage-list .advantage-item .advantage-item-content{
    font-size: 16px;
    color: #000000;
}


@media only screen and (min-width: 1000px) and (max-width: 1440px) {
    .advantage-wrap{
        margin-top: 80px;
    }
    .advantage{
        margin-top: 50px;
    }
    .advantage .advantage-content .advantage-title{
        font-size: 20px;
    }
    .advantage .advantage-content .advantage-desc{
        font-size: 14px;
        margin-top: 15px;
    }
    .advantage-list .advantage-item{
        margin-top: 65px;
    }
    .advantage-list .advantage-item .advantage-item-img{
        width: 70px;
        height: 70px;
        margin-top: -35px;
    }
    .advantage-list .advantage-item .advantage-item-title{
        font-size: 18px;
        margin: 25px 0 15px;
    }
    .advantage-list .advantage-item .advantage-item-content{
        font-size: 14px;
    }
}
@media only screen and (min-width: 768px) and (max-width: 1000px) {
    .advantage-wrap{
        margin-top: 60px;
    }
    .advantage{
        margin-top: 40px;
    }
    .advantage .advantage-content .advantage-title{
        font-size: 18px;
    }
    .advantage .advantage-content .advantage-desc{
        font-size: 12px;
        margin-top: 10px;
    }
    .advantage-list .advantage-item{
        margin-top: 50px;
    }
    .advantage-list .advantage-item .advantage-item-img{
        width: 60px;
        height: 60px;
        margin-top: -30px;
    }
    .advantage-list .advantage-item .advantage-item-title{
        font-size: 16px;
        margin: 20px 0 10px;
    }
    .advantage-list .advantage-item .advantage-item-content{
        font-size: 12px;
    }
}
@media only screen and (max-width: 768px){
    .advantage-wrap{
        margin-top: 60px;
    }
    .advantage{
        margin-top: 40px;
    }
    .advantage .advantage-content .advantage-title{
        font-size: 18px;
    }
    .advantage .advantage-content .advantage-desc{
        font-size: 12px;
        margin-top: 10px;
    }
    .advantage-list .advantage-item{
        margin-top: 50px;
        width: 49%;
    }
    .advantage-list .advantage-item .advantage-item-img{
        width: 60px;
        height: 60px;
        margin-top: -30px;
    }
    .advantage-list .advantage-item .advantage-item-title{
        font-size: 16px;
        margin: 20px 0 10px;
    }
    .advantage-list .advantage-item .advantage-item-content{
        font-size: 12px;
    }
}




.faq{
    max-width: var(--iw);
    margin: 60px auto 0;
}
.faq .faq-question-list{
    margin-top: 70px;
}
.faq .faq-line{
    width: 100%;
    height: 1px;
    background: #DBDBDB;
    margin: 40px 0;
}
.faq .faq-question-item{
    margin-top: 40px;
}
.faq .faq-question-item .faq-question-wrap{
    display: flex;
    justify-content: space-between;
    align-items: center;
    cursor: pointer;
}
.faq .faq-question-item .faq-question{
    font-weight: bold;
    font-size: 20px;
    color: #1A1A1A;
    line-height: 30px;
    display: flex;
    align-items: center;
}
.faq .faq-question-item .faq-question .faq-question-num{
    font-size: 40px;
    margin-right: 20px;
}
.faq .faq-question-item .faq-icon{
    transition: all .5s ease-in-out;
}
.faq .faq-question-item .faq-answer{
    max-height: 0;
    opacity: 0;
    padding-top: 0;
    font-size: 16px;
    color: #666666;
    overflow: hidden;
    transition: all .3s ease-in-out;
}
.faq .faq-question-item.active .faq-icon{
    transform: rotateX(180deg);
}
.faq .faq-question-item.active .faq-answer{
    max-height: 300px;
    padding-top: 30px;
    opacity: 1;
}



@media only screen and (min-width: 1000px) and (max-width: 1440px) {
    .faq .faq-question-list{
        margin-top: 60px;
    }
    .faq .faq-line{
        margin: 30px 0;
    }
    .faq .faq-question-item{
        margin-top: 30px;
    }
    .faq .faq-question-item .faq-question{
        font-size: 18px;
    }
    .faq .faq-question-item .faq-question .faq-question-num{
        font-size: 36px;
        margin-right: 18px;
    }
    .faq .faq-question-item.active .faq-answer{
        font-size: 14px;
    }
}
@media only screen and (min-width: 768px) and (max-width: 1000px) {
    .faq .faq-question-list{
        margin-top: 40px;
    }
    .faq .faq-line{
        margin: 20px 0;
    }
    .faq .faq-question-item{
        margin-top: 20px;
    }
    .faq .faq-question-item .faq-question{
        font-size: 16px;
    }
    .faq .faq-question-item .faq-question .faq-question-num{
        font-size: 32px;
        margin-right: 16px;
    }
    .faq .faq-question-item.active .faq-answer{
        font-size: 12px;
    }
}
@media only screen and (max-width: 768px) {
    .faq .faq-question-list{
        margin-top: 40px;
    }
    .faq .faq-line{
        margin: 20px 0;
    }
    .faq .faq-question-item{
        margin-top: 20px;
    }
    .faq .faq-question-item .faq-question{
        font-size: 16px;
    }
    .faq .faq-question-item .faq-question .faq-question-num{
        font-size: 32px;
        margin-right: 16px;
    }
    .faq .faq-question-item.active .faq-answer{
        font-size: 12px;
    }
}