.intro-section {
    padding: 120px 0 110px;
    display: flex;
    justify-content: center;
}

.intro-card {
    border-radius: 20px;
    padding: 155px 50px;
    color: #fff;
    text-align: center;
    position: relative;
    overflow: hidden;
}

.intro-card .bg {
    position: absolute;
    top: 0;
    left: 0;
    width: 100%;
    height: 100%;
}

.intro-card .bg img {
    display: block;
    width: 100%;
    height: 100%;
    object-fit: cover;
}

.intro-content {
    position: relative;
    z-index: 2;
    width: 1220px;
    max-width: 100%;
    margin: 0 auto;
}

.intro-content h2 {
    line-height: 1.22;
}

.intro-content .text {
    font-weight: 400;
    font-size: 16px;
    color: #FFFFFF;
    line-height: 24px;
    margin-top: 2.1em;
    text-align: left;
}

.build-together {
    padding: 0 0 120px;
    background: #fff;
}

.section-title {
    color: #000;
    text-align: center;
}

.section-subtitle {
    font-family: Poppins;
    font-weight: 400;
    font-size: 16px;
    color: #666666;
    line-height: 24px;
    width: 1012px;
    max-width: 100%;
    margin: 0 auto;
    text-align: center;
    margin-top: 1.5em;
}

.build-list {
    position: relative;
    margin-top: 50px;
}

.build-list .hide-bg {
    display: block;
    width: 19%;
    opacity: 0;
}

.buildSwiper {
    position: absolute;
    left: 0;
    top: 0;
    width: 100%;
    height: 100%;
    display: flex;
    justify-content: space-between;
    z-index: 3;

}

.build-card {
    width: 19%;
    height: 100%;
    border-radius: 15px;
    position: relative;
    overflow: hidden;
    transition: all 0.4s ease;
}

.build-card .bg {
    height: 100%;
}

.build-card .bg img {
    width: auto;
    min-width: 100%;
    height: 100%;
    object-fit: cover;
}

.build-card .card-overlay {
    position: absolute;
    bottom: 50px;
    left: 0;
    width: 100%;
    padding: 0 40px;
    z-index: 2;
}

.build-card h3 {
    font-weight: 600;
    font-size: 22px;
    color: #FFFFFF;
    line-height: 30px;
    font-family: 'Poppins-SemiBold';
    text-align: center;
}

.build-card.active-hover {
    width: 38.25%;
}

.build-card.active-hover h3 {
    text-align: left;
}

.why-partner {
    position: relative;
}

.why-partner .bg img,
.why-partner .bg {
    position: absolute;
    left: 0;
    top: 0;
    width: 100%;
    height: 100%;
}

.why-partner .bg img {
    object-fit: cover;
    opacity: 0;
    transition: 0.3s;
}

.why-partner .bg img.active {
    opacity: 1;
}

.why-partner .why-center-title {
    position: absolute;
    top: 125px;
    width: 100%;
    text-align: center;
    padding: 0 3%;
    z-index: 3;
}

.why-partner .why-center-title .section-title {
    text-align: center;
    color: #fff;
}

.why-grid {
    position: relative;
    z-index: 2;
}

.why-item {
    text-align: center;
    padding: 0 10px;
    /* opacity: 0.7; */
    transition: 0.3s;
    height: 784px;
    display: flex;
    align-items: flex-end;
    width: 25%;
}

.why-item:not(:last-child) {
    border-right: 1px solid rgba(255, 255, 255, 0.1);
}

.why-item .itemBox {
    padding: 0 50px 77px;
    width: 100%;
    cursor: pointer;
}

.why-item h3 {
    font-weight: 500;
    font-size: 24px;
    color: #FFFFFF;
    line-height: 30px;
    font-family: 'Poppins-Medium';
}

.why-num {
    display: block;
    line-height: 1;
    margin-bottom: 20px;
    background: linear-gradient(to bottom, rgba(255, 255, 255, .8), rgba(255, 255, 255, 0));
    -webkit-background-clip: text;
    background-clip: text;
    -webkit-text-fill-color: transparent;
    color: transparent;
}

.why-item.active .why-num {
    font-family: Poppins;
    font-weight: 400;
    font-size: 50px;
    color: rgba(255, 255, 255, 0);
    line-height: 1;
    text-stroke: 1px #EBEBEB;
    -webkit-text-stroke: 1px #EBEBEB;
    background: transparent;
    margin-bottom: 28px;
}

.why-item .dot {
    width: 6px;
    height: 6px;
    background: rgba(34, 34, 34, 0);
    border-radius: 50%;
    border: 2px solid #FAFAFA;
    display: block;
    margin: 16px auto 0;
}

/* 激活状态的样式 (中间那个) */
.why-item.active {}

.why-item p {
    font-size: 15px;
    color: #FFFFFF;
    line-height: 24px;
    margin-top: 36px;
    display: none;
    text-align: left;
}

.why-item.active p {
    display: block;
}

.how-to-partner {
    padding: 120px 0;
    background: #fff;
}

.partner-steps-grid {
    display: grid;
    grid-template-columns: repeat(4, 1fr);
    gap: 20px;
    margin-top: 50px;
}

.step-card {
    background: #F5F5F5;
    border-radius: 15px;
    padding: 60px 35px 45px;
    transition: all 0.3s ease;
    cursor: default;
}

.step-num {
    font-size: 16px;
    color: rgba(51, 51, 51, .5);
    font-weight: bold;
}

.step-icon {
    margin: 40px 0 20px;
    width: 58px;
    height: 58px;
    background: rgba(255, 255, 255, 0);
    border-radius: 50%;
    border: 1px solid #000000;
    display: flex;
    align-items: center;
    justify-content: center;
}

.step-icon img {
    max-width: 56%;
    max-height: 56%;
}

.step-card h3 {
    font-size: 24px;
    line-height: 1.41;
    margin-bottom: 15px;
    /* font-weight: 700; */
    font-family: 'Poppins-SemiBold';
}

.step-card:hover .step-icon img {
    filter: brightness(0) invert(1);
    transition: filter 0.3s ease;
}

.step-card p {
    font-size: 14px;
    font-size: 15px;
    color: rgba(102, 102, 102, 1);
    line-height: 25px;
    margin: 15px 0 0;
}

.step-link {
    color: rgba(59, 255, 217, 1);
    text-decoration: underline;
    font-size: 15px;
    line-height: 1;
    opacity: 0;
    visibility: hidden;
    margin-top: 25px;
    display: inline-block;
}

.step-card:hover .step-link {
    opacity: 1;
    visibility: visible;
}

.step-card:hover,
.step-card.active {
    background: rgba(0, 0, 0, 1);
    color: rgba(255, 255, 255, 1);
}

.step-card:hover .step-num,
.step-card.active .step-num {
    color: rgba(255, 255, 255, 0.5);
}

.step-card:hover .step-icon,
.step-card.active .step-icon {
    border-color: #fff;
    color: #fff;
}

.step-card:hover p,
.step-card.active p {
    color: #ccc;
}

.case-studies {
    padding: 0 0 107px;
    overflow: hidden;
}

.case-grid {
    margin-top: 50px;
}

.case-grid .swiper {
    overflow: visible;
}

.case-item {
    cursor: pointer;
    width: 595px;
}

.case-item .picCover {
    padding-top: 78.65%;
}

.case-item:not(:last-child) {
    margin-right: 30px;
}

.case-img-wrap {
    position: relative;
    overflow: hidden;
    border-radius: 20px;
    margin-bottom: 35px;
}


.case-arrow {
    position: absolute;
    top: 24px;
    right: 30px;
    width: 47px;
    height: 47px;
    background: #FFFFFF;
    border-radius: 6px;
    display: flex;
    align-items: center;
    justify-content: center;
    font-weight: bold;
    color: rgba(0, 0, 0, 1);
}

.case-arrow .iconfont {
    font-size: 20px;
}

.case-item h3 {
    font-weight: 600;
    font-size: 22px;
    color: #222222;
    line-height: 30px;
    margin-bottom: 10px;
    transition: 0.3s;
    font-family: 'Poppins-SemiBold';
}

.case-item:hover h3 {
    color: rgba(59, 255, 217, 1);
}

.case-item p {
    font-weight: 400;
    font-size: 15px;
    color: #666666;
    line-height: 25px;
    margin-top: 1em;
}

.view-all-container {
    text-align: center;
    margin-top: 62px;
}

.btn-view-all {
    display: inline-flex;
    background: rgba(0, 0, 0, 1);
    color: rgba(59, 255, 217, 1);
    padding: 0 33px;
    border-radius: 30px;
    font-weight: bold;
    font-size: 14px;
    line-height: 57px;
    transition: 0.3s;
    gap: 0 5px;
    font-family: 'Poppins-SemiBold';
}

.btn-view-all:hover {
    background: rgba(59, 255, 217, 1);
    color: #333;
}
.btn-view-all .iconfont{
    transition: 0.3s;
}
.btn-view-all:hover .iconfont{
    transform: rotate(45deg);
}
@media (max-width:1440px) {
    .intro-content{
        width: 100%;
    }
}
@media (max-width:1280px) {
    .why-item{
        width: 50%;
    }
}
@media (max-width:1199px) {
    .section-subtitle{
        margin-top: 1em;
    }
    .how-to-partner,
    .intro-section{
        padding: 80px 0;
    }
    .intro-card{
        padding: 80px 40px;
    }
    .why-partner .why-center-title{
        top: 80px;
    }
    .case-studies,
    .build-together{
        padding-bottom: 80px;
    }
    .view-all-container,
    .case-grid,
    .partner-steps-grid,
    .build-list{
        margin-top: 45px;
    }
    .build-card .card-overlay{
        padding: 0 20px;
        font-size: 20px;
        bottom: 20px;
    }
    .build-card h3{
        font-size: 20px;
        text-align: left;
    }
    .buildSwiper{
        display: grid;
        grid-template-columns: repeat(4,1fr);
        gap: 20px;
    }
    .build-card.active-hover,
    .build-card{
        width: 100%;
    }
    .build-list .hide-bg{
        display: none;
    }
    .buildSwiper{
        position: relative;
    }
    .build-card .bg img{
        width: 100%;
        height: 35.61vw;
    }
    .why-item{
        height: 549px;
    }
    .partner-steps-grid{
        grid-template-columns: repeat(2,1fr);
    }
}
@media (max-width:1024px) {
    .why-item.active .why-num{
        font-size: 40px;
    }
    .why-item{
        width: 100%;
    }
    .buildSwiper{
        grid-template-columns: repeat(2,1fr);
    }
    .build-card h3{
        font-size: 18px;
    }
    .how-to-partner,
    .intro-section{
        padding: 70px 0;
    }
    .intro-card{
        padding: 70px 40px;
    }
    .why-partner .why-center-title{
        top: 70px;
    }
    .case-studies,
    .build-together{
        padding-bottom: 70px;
    }
    .view-all-container,
    .case-grid,
    .partner-steps-grid,
    .build-list{
        margin-top: 40px;
    }
    .case-item{
        width: 480px;
        max-width: 80%;
    }
    .case-img-wrap{
        margin-bottom: 20px;
    }
    .case-item p{
        margin-top: .5em;
    }
}
@media (max-width: 768px) {
    .case-item h3{
        font-size: 20px;
    }
    .step-icon{
        margin-top: 20px;
    }
    .step-card{
        padding: 40px 30px;
    }
    .why-item .itemBox{
        padding: 0 20px 40px;
    }
    .how-to-partner,
    .intro-section{
        padding: 60px 0;
    }
    .intro-card{
        padding: 60px 30px;
    }
    .why-partner .why-center-title{
        top: 60px;
    }
    .case-studies,
    .build-together{
        padding-bottom: 60px;
    }
    .view-all-container,
    .case-grid,
    .partner-steps-grid,
    .build-list{
        margin-top: 35px;
    }
    .intro-content .text{
        margin-top: 1.1em;
    }
    .why-item p{
        margin-top: 20px;
    }
    .why-num{
        margin-bottom: 10px;
    }
    .why-item h3{
        font-size: 22px;
    }
    .step-card h3{
        font-size: 22px;
    }
    .partner-steps-grid{
        grid-template-columns: repeat(1,1fr);
    }
}
@media (max-width: 500px) {
    .case-item h3{
        margin-bottom: 0;
    }
    .btn-view-all{
        line-height: 50px;
    }
    .case-item{
        max-width: 90%;
    }
    .case-item h3{
        font-size: 16px;
    }
    .step-card h3{
        font-size: 20px;
    }
    .why-item{
        height: 430px;
    }
    .why-item h3{
        font-size: 20px;
    }
    .why-item.active .why-num{
        font-size: 30px;
        margin-bottom: 15px;
    }
    .build-card .card-overlay{
        padding: 0 15px;
        border-bottom: 15px;
    }
    .build-card h3{
        font-size: 16px;
        line-height: 24px;
    }
    .intro-content .text{
        margin-top: .7em;
    }
    .how-to-partner,
    .intro-section{
        padding: 50px 0;
    }
    .intro-card{
        padding: 50px 25px;
    }
    .why-partner .why-center-title{
        top: 50px;
    }
    .case-studies,
    .build-together{
        padding-bottom: 50px;
    }
    .view-all-container,
    .case-grid,
    .partner-steps-grid,
    .build-list{
        margin-top: 30px;
    }
}