/* 加入我们 */
html {
  scroll-behavior: smooth;
}
.screen1 {
    width: 100%;
    padding-top: 49.58%;
    background-size: cover;
    background-color: #ccc;
    position: relative;
}
.screen1 img {
    position: absolute;
    top: 40%;
    left: 50%;
    transform: translate(-50%, -50%);
    width: 40%;
    max-width: 335px;
    height: auto;
    margin: 0 auto;
    display: block;
}
.join_us_content {
    width: 200px;
    height: 48px;
    text-align: center;
    line-height: 48px;
    position: absolute;
    margin: 0 auto;
    top: 55%;
    left: 50%;
    transform: translate(-50%, -50%);
    color: #fff;
    border: 1px solid #5ABC2E;
    background-color: rgba(90, 188, 46, 0.60);
    border-radius: 30px;
    animation: join-breath 2.4s ease-in-out infinite;
}
.join_us_content:hover {
    color: #fff !important;
}
/* screen2 */ 
.screen2 {
    background-color: #F1F1F1;
}
.screen2_container {
    position: relative;
    height: 720px;
    display: block;
    margin: 0 auto;
    background-image: url('../assets/img/join_bg.png');
    background-position: center center;
    background-repeat: no-repeat;
    background-size: cover;
    padding-top: 50px;
}
.screen2_left {
    width: 1000px;
    margin: 0 auto;
    text-align: center;
    background: rgba(248, 248, 248, 0.6);
    border-radius: 20px;
    padding:40px 20px;
    position: absolute;
    left: 50%;
    top: 50%;
    transform: translate(-50%, -50%);
}
.screen2_title {
    font-size: 60px;
    font-weight: bold;
    color: rgba(10, 10, 10, 1);
    line-height: 1.5;
    margin-bottom: 16px;
    transition: all 0.5s ease;
}
.screen2_subtitle {
    font-size: 24px;
    color: rgba(101, 100, 98, 1);
    line-height: 1.5;
    margin-bottom: 40px;
    transition: all 0.5s ease;
}
.screen2_card {
    width: 360px;
    height: 190px;
    background-color: #DFDEDE;
    border-radius: 20px;
    margin: 0 auto 45px;
    transition: all 0.5s ease;
    position: relative;
    overflow: hidden;
}
/* .screen2_card::before {
    content: '';
    position: absolute;
    top: 0;
    left: 0;
    right: 0;
    bottom: 0;
    background-image: url('../assets/img/join_bg.jpg');
    background-repeat: no-repeat;
    background-size: cover;
    background-position: center;
    filter: blur(5px);
    z-index: 0;
} */
.screen2_card_number {
    font-size: 64px;
    font-weight: bold;
    color: #222;
    line-height: 1.5;
    margin-bottom: 0;
    padding-top: 20px;
    position: relative;
    z-index: 1;
}
.screen2_card_text {
    font-size: 24px;
    color: #333;
    line-height: 36px;
    margin-bottom: 0;
    position: relative;
    z-index: 1;
}
.screen2_actions {
    overflow: hidden;
    width: 600px;
    margin: 0 auto;
}
.screen2_btn {
    width: 288px;
    height: 84px;
    border-radius: 20px;
    background-repeat: no-repeat;
    background-position: center;
    background-size: contain;
    transition: all 0.5s ease;
    color: #fff;
    line-height: 84px;
    font-size: 24px;
    background-repeat: no-repeat;
    background-size: cover;
    overflow: hidden;
    position: relative;
}
.screen2_btn_bg {
    position: absolute;
    top: 0;
    left: 0;
    right: 0;
    bottom: 0;
    background-color: #6cd93c;
    opacity: 0;
    transition: all 0.5s ease;
}
.screen2_btn:hover {
    color: #fff !important;
    font-size: 26px;
    
}
.screen2_btn:hover .screen2_btn_bg {
    opacity: 1;
}
.screen2_btn span {
    position: absolute;
    top: 50%;
    left: 50%;
    transform: translate(-50%, -50%);
    z-index: 2;
}
.screen2_btn:first-child {
    float: left;
    margin-right: 24px;
    background-image: url('../assets/img/join_social_bg.png');
}
.screen2_btn:last-child {
    float: right;
    background-image: url('../assets/img/join_school_bg.png');

}
.screen2_triangle {
    position: absolute;
    left: 48%;
    top: 0;
    width: 0;
    height: 0;
    border-left: 160px solid #F1F1F1;
    border-bottom: 780px solid transparent;
    display: block;
}
@media screen and (max-width: 1199.98px) {
    .screen2_container {
        width: 100%;
        height: 680px;
        background-size: 100% 100%;
    }
    .screen2_left {
        width: 100%;
        max-width: 800px;
    }
    .screen2_triangle {
        display: none;
    }
    .screen2_title {
        font-size: 50px;
    }
    .screen2_subtitle {
        font-size: 20px;
    }
    .screen2_card {
        width: 300px;
        height: 150px;
    }
    .screen2_card_number {
        font-size: 40px;
    }
    .screen2_card_text {
        font-size: 18px;
    }
}
@media screen and (max-width: 599.98px) {
    .screen2_container {
        width: 100%;
        height: 480px;
        background-size: 100% 100%;
    }
    .screen2_left {
        width: 100%;
        position: relative;
        left: 0;
        transform: translateX(0);
        padding-top: 60px;
    }
    .screen2_triangle {
        display: none;
    }
    .screen2_title {
        font-size: 40px;
    }
    .screen2_subtitle {
        font-size: 18px;
        margin-bottom: 40px;
    }
    .screen2_card {
        width: 240px;
        height: 120px;
    }
    .screen2_card_number {
        font-size: 30px;
    }
    .screen2_card_text {
        font-size: 16px;
    }
    .screen2_actions {
        width: 320px;
    }
    .screen2_btn {
        width: 144px;
        height: 36px;
        line-height: 36px;
        font-size: 16px;
        border-radius: 8px;
    }
}
/* screen3 */
.screen3 {
    padding-top: 50px;
    padding-bottom: 90px;
    background-color: #f1f1f1;
}
.join_gift_title {
    width: 80%;
    height: auto;
    display: block;
    margin: 0 auto;
    max-width: 701px;
    height: auto;
}
.join_gift_wall {
    width: 1335px;
    height: auto;
    display: block;
    margin: 60px auto 0;
    max-width: 1336px;
    color: #fff;
    transition: all 0.5s ease;
    overflow: hidden;
}
.join_gift_item {
    width: 33.33%;
    height: auto;
    max-height: 286px;
    position: relative;
    float: left;
}
@media screen and (min-width: 449.98px) and (max-width: 1334.98px) {
    .join_gift_item {
        height: 286px !important;
    }
}
.join_gift_item img {
    width: 100%;
    height: auto;
    max-height: 286px;
}
.join_gift_item_content {
    position: absolute;
    top: 0;
    left: 0;
    right: 0;
    bottom: 0;
    background-color: transparent;
    transition: all 0.5s ease;
    box-sizing: border-box;
    padding: 12px 20px;
    overflow: hidden;
}
.join_gift_item_title {
    font-size: 24px;
    font-weight: bold;
    color: #fff;
    margin-top: 235px;
    transition: all 0.5s ease;
}
.join_gift_item_desc {
    font-size: 16px;
    color: #fff;
    display: -webkit-box;
    -webkit-box-orient: vertical;
    -webkit-line-clamp: 4;
    line-clamp: 4;
    overflow: hidden;
    text-overflow: ellipsis;
}
.join_gift_item:hover .join_gift_item_content {
    background-color: rgba(90, 188, 46, .9);  
}
.join_gift_item:hover .join_gift_item_title {
    margin-top: 120px;
}
.join_gift_item:nth-child(4), .join_gift_item:nth-child(5) {
    width: 50%;
    max-height: 429px;
}
.join_gift_item:nth-child(4) img, .join_gift_item:nth-child(5) img {
    max-height: 429px;
}
.join_gift_item:nth-child(4) .join_gift_item_title, .join_gift_item:nth-child(5) .join_gift_item_title {
    margin-top: 378px;
}
.join_gift_item:nth-child(4):hover .join_gift_item_title, .join_gift_item:nth-child(5):hover .join_gift_item_title {
    margin-top: 263px;
}
@media (max-width: 1334.98px) {
    .join_gift_wall {
        width: 890px;
        margin: 50px auto 0;
    }
    .join_gift_item {
        width: 445px;
        max-height: 286px;
    }
    .join_gift_item:nth-child(4), .join_gift_item:nth-child(5) {
        width: 50%;
        max-height: 286px;
    }
    .join_gift_item:nth-child(4) img, .join_gift_item:nth-child(5) img {
        max-height: 286px;
    }
    .join_gift_item:nth-child(4) .join_gift_item_title, .join_gift_item:nth-child(5) .join_gift_item_title {
        margin-top: 235px;
    }
    .join_gift_item:nth-child(4):hover .join_gift_item_title, .join_gift_item:nth-child(5):hover .join_gift_item_title {
        margin-top: 120px;
    }
}
@media (max-width: 899.98px) {
    .join_gift_wall {
        width: 445px;
        margin: 40px auto 0;
    }
    .join_gift_item:nth-child(4), .join_gift_item:nth-child(5) {
        width: 100%;
        max-height: 286px;
    }
}
@media (max-width: 449.98px) {
    .join_gift_wall {
        width: 96%;
        margin: 20px auto 0;
    }
    .join_gift_item {
        width: 100%;
        margin: 0 auto;
    }
}
@keyframes join-breath {
    0% {
        transform: translate(-50%, -50%) scale(1);
        box-shadow: 0 0 0 0 rgba(90, 188, 46, 0.4);
    }
    50% {
        transform: translate(-50%, -50%) scale(1.04);
        box-shadow: 0 0 20px 4px rgba(90, 188, 46, 0.35);
    }
    100% {
        transform: translate(-50%, -50%) scale(1);
        box-shadow: 0 0 0 0 rgba(90, 188, 46, 0.0);
    }
}
/* 联系我们 */
.contact_us {
    background: #212120;
    padding: 24px 40px 0;
    width: 100%;
}

.contact_us_content {
    padding-bottom: 30px;
    border-bottom: 0.5px solid rgba(217, 217, 217, 0.2);
}

.contact-us-inner {
    margin: 0 auto;
}

.contact-us-items {
    display: flex;
    flex-wrap: wrap;
    gap: 40px;
}

.contact-us-item {
    align-items: center;
    min-width: 220px;
    color: #ffffff;
}

.contact-us-icon {
    width: 36px;
    height: 36px;
    margin-bottom: 4px;
}

.contact-us-icon img {
    width: 100%;
    height: 100%;
}
.contact-us-icon::before {
    content: '';
    position: absolute;
    top: 50%;
    left: 50%;
    width: 20px;
    height: 20px;
    transform: translate(-50%, -50%);
    background-repeat: no-repeat;
    background-position: center;
    background-size: contain;
}

.contact-us-title {
    font-size: 20px;
    line-height: 40px;
    font-weight: 500;
    color: rgba(255, 255, 255, 0.9);
}

.contact-us-email {
    font-size: 14px;
    color: rgba(255, 255, 255, 0.6);
    text-decoration: none;
}

.contact-us-email:hover {
    color: #ffffff;
}

.contact-us-heading {
    font-size: 30px;
    font-weight: 700;
    color: #ffffff;
    text-align: right;
}

@media (max-width: 991.98px) {
    .contact_us {
        padding: 24px 20px 0;
    }

    .contact-us-items {
        gap: 24px;
    }

    .contact-us-heading {
        margin-top: 24px;
        text-align: left;
    }
}

@media (max-width: 575.98px) {
    .contact-us-item {
        width: 100%;
    }

    .contact-us-title {
        font-size: 15px;
    }

    .contact-us-email {
        font-size: 13px;
    }

    .contact-us-heading {
        font-size: 22px;
    }
}

/* 产品手风琴响应式 */
@media (max-width: 1200px) {
    .product:hover .product-item {
        flex: 0 0 calc((100% - 500px) / 4);
    }
    
    .product:hover .product-item:hover {
        flex: 0 0 500px;
    }
}

@media (max-width: 992px) {
    .product {
        flex-direction: column;
        height: auto;
    }
    
    .product-item {
        width: 100%;
        height: 872px;
        flex: 1;
    }
    
    .product:hover .product-item {
        flex: 0 0 auto;
        height: 200px;
    }
    
    .product:hover .product-item:hover {
        flex: 0 0 auto;
        height: 872px;
    }
}

@media (max-width: 768px) {
    .product-item {
        height: 600px;
    }
    
    .product:hover .product-item:hover {
        height: 600px;
    }
}