html, body {
    background-color: #FFF;
    font-size: 16px;
}

.nav-block {
    border-bottom: 1px solid var(--base-border-color);
}

.nav-wrapper {
    display: flex;
    font-size: 18px;
    height: 80px;
    align-items: center;
}

.nav-wrapper .item {
    margin-right: 30px;
    cursor: pointer;
    position: relative;
    transition: all .3s;
}

.nav-wrapper .item.active, .nav-wrapper .item:hover {
    color: var(--primary-color);
    font-weight: bold;
}

.nav-wrapper .item::after {
    content: '';
    position: absolute;
    left: 0;
    bottom: -28px;
    width: 0;
    height: 3px;
    transition: all .3s;
}

.nav-wrapper .item.active::after, .nav-wrapper .item:hover::after{
    width: 100%;
    background: linear-gradient(to right, #cc0000, transparent);
}

.introduction {
    padding: 80px 0;
}

.introduction .top {
    display: flex;
}

.introduction .top .left, .introduction .top .right {
    width: 50%;
}

.introduction .top .left {
    padding-right: 60px;
}

.introduction .title {
    font-size: 40px;
    line-height: 54px;
    font-weight: bold;
}

.introduction .sub-title {
    font-size: 30px;
    line-height: 54px;
}

.introduction .data-wrapper .line {
    display: flex;
    /*padding: 30px 0;*/
}

.introduction .data-wrapper .line > div {
    flex: 0.4;
    padding: 30px 0;
}

.introduction .data-wrapper .line:first-child > div {
    border-bottom: 1px dashed var(--base-border-color);
}

.introduction .data-wrapper .num {
    font-size: 60px;
    line-height: 1.3;
    font-weight: bolder;
    color: var(--primary-color);
}

.introduction .data-wrapper .unit {
    font-size: 15px;
    color: #666666;
}

.introduction .top .right {
    text-indent: 2em;
    font-size: 18px;
    line-height: 2.2;
}

.introduction .bottom {
    position: relative;
    margin-top: 30px;
}

.introduction .bottom .background {
    width: 100%;
}

.introduction .bottom .video-icon {
    position: absolute;
    width: 100px;
    height: 100px;
    top: 50%;
    left: 50%;
    transform: translate(-50%, -50%);
    z-index: 10;
    cursor: pointer;
}

@keyframes flip {
    0% {
        transform: rotateY(0);
    }
    
    50% {
        transform: rotateY(180deg);
    }
    
    100% {
        transform: rotateY(360deg);
    }
}

.introduction .bottom .video-icon:hover img {
    animation: flip 3s infinite cubic-bezier(0, 0.99, 1, 1)
}

.introduction .bottom .video {
    display: none;
}

.introduction .bottom .video video {
    width: 100%;
    min-height: 300px;
}

.header {
    text-align: center;
}

.header .title {
    font-size: 40px;
    font-weight: bold;
}

.header .sub-title {
    font-size: 20px;
    color: #666666;
    margin-top: 20px;
}

.culture {
    padding: 80px 0;
    background-image: url('../images/about-bg-2.png');
    background-size: 100% 100%;
}

.culture .content {
    display: flex;
     flex-wrap: wrap; 
    justify-content: center;
    align-items: center;
}

.culture .content .item {
    /* flex: 1;
     */
     width: calc((100% - 20px) / 3); 
    padding: 60px 40px;
    text-align: center;
}

.culture .content .item img {
    width: auto;
    margin: 0 auto;
}

.culture .content .item .label {
    font-size: 36px;
    font-weight: 550;
    margin: 30px 0 15px 0;
    position: relative;
}

.culture .content .item .label::after {
    content: '';
    position: absolute;
    width: 30px;
    height: 2px;
    background-color: var(--primary-color);
    bottom: -5px;
    left: 50%;
    transform: translateX(-50%)
}

.culture .content .item .desc {
    font-size: 18px;
    color: #666666;
}

.history {
    padding: 100px 0;
}

.history .content {
    position: relative;
    border-bottom: 1px solid var(--base-border-color);
}

.history .year-swiper {
    max-width: 1600px;
    margin: 0 auto;
    overflow: hidden;
    position: relative;
}

.history .year-swiper .item {
    height: 100%;
    display: flex;
    align-items: center;
    justify-content: center;
}

.history .year-swiper .item .left {
    font-size: 380px;
    font-weight: bold;
    font-family: fantasy;
    display: inline-block;
    background: -webkit-linear-gradient(rgba(255, 0, 0, 0.16), transparent);
    -webkit-background-clip: text;
    -webkit-text-fill-color: transparent;
    color: #ff7e5f;
    padding-right: 120px;
}

.history .year-swiper .item .label {
    font-size: 34px;
    font-weight: bold;
    padding-left: 20px;
    position: relative;
}

.history .year-swiper .item .label::before {
    content: '';
    position: absolute;
    left: 0;
    top: 50%;
    transform: translateY(-50%);
    width: 3px;
    height: 60%;
    background-color: var(--primary-color);
}

.history .year-swiper .item .desc {
    font-size: 24px;
    margin-top: 10px;
}

.navigation .swiper-button {
    position: absolute;
    width: 60px;
    height: 60px;
    background-color: var(--primary-color);
    border: 1px solid var(--primary-color);
    border-radius: 50%;
    display: flex;
    align-items: center;
    justify-content: center;
    cursor: pointer;
    box-shadow: 0 0 25px var(--primary-color);
}

.navigation .swiper-button.swiper-button-disabled {
    border: 1px solid #e5e5e5;
    background-color: transparent;
    box-shadow: none;
}

.navigation .swiper-button i {
    background-color: #FFF;
    color: var(--primary-color);
    border-radius: 50%;
    width: 24px;
    height: 24px;
    text-align: center;
    line-height: 22px
}

.navigation .swiper-button.swiper-button-disabled i {
    background-color: #bfbfbe;
    color: #FFF;
}

.history .navigation .swiper-button {
    top: 50%;
    transform: translateY(-50%);
}

.history .navigation .button-prev {
    left: 3%;
}

.history .navigation .button-next {
    right: 3%;
}

.year-pagination {
    display: flex;
    justify-content: center;
    position: absolute;
    bottom: -49px !important;
}

.year-pagination .bullet {
    margin: 0 60px 0 0 !important;
    width: auto !important;
    height: auto !important;
    background: transparent !important;
    position: relative;
    font-size: 22px;
    font-weight: bold;
    color: #666666;
    opacity: 1 !important;
}

.year-pagination .bullet:last-child {
    margin-right: 0 !important;
}

.year-pagination .bullet::before {
    content: '';
    width: 9px;
    height: 9px;
    background-color: #cccccc;
    position: absolute;
    top: -18px;
    left: 50%;
    transform: translateX(-50%);
}

.year-pagination .bullet.swiper-pagination-bullet-active {
    color: var(--primary-color) !important;
}

.year-pagination .bullet.swiper-pagination-bullet-active::before {
    background-color: var(--primary-color) !important;
}

.certificate {
    padding: 80px 0;
    background-image: url('../images/about-bg-2.png');
    background-size: 100% 100%;
}

.cert-swiper {
    position: relative;
    overflow: hidden;
    padding: 60px 0 120px 0;
}

.certificate .navigation {
    position: absolute;
    left: 50%;
    bottom: 20px;
    transform: translateX(-50%);
    display: flex;
}

.certificate .navigation .swiper-button {
    position: unset;
    margin: 0 20px;
}

@media screen and (max-width: 1440px) {
    .history .year-swiper {
        max-width: 1000px;
    }
    
    .history .year-swiper .item .left {
        font-size: 280px;
    }
}

@media screen and (max-width: 1280px) {
    .history .year-swiper {
        max-width: 768px;
    }
    
    .history .year-swiper .item .left {
        font-size: 220px;
        padding-right: 100px;
    }
    
    .history .year-swiper .item .label {
        font-size: 36px;
    }
    
    .history .year-swiper .item .desc {
        font-size: 20px;
    }
}

@media screen and (max-width: 768px) {
    .nav-wrapper {
        font-size: 16px;
        height: 70px;
    }
    
    .nav-wrapper .item::after {
        bottom: -28px;
    }
    
    .introduction {
        padding: 60px 0;
    }
    
    .introduction .top {
        flex-direction: column;
    }
    
    .introduction .top .left, .introduction .top .right {
        width: 100%;
    }
    
    .introduction .top .left {
        padding: unset;
    }
    
    .introduction .title {
        font-size: 32px;
        line-height: 1.2;
    }
    
    .introduction .sub-title {
        font-size: 22px;
    }
    
    .introduction .data-wrapper .line {
        text-align: center;
    }
    
    .introduction .data-wrapper .line > div {
        flex: 1;
    }
    
    .introduction .data-wrapper .num {
        font-size: 48px;
    }
    
    .introduction .bottom .video-icon {
        width: 60px;
        height: 60px;
    }
    
    .culture  {
        padding: 60px 0;
    }
    
    .culture .content {
        flex-wrap: wrap
    }
    
    .culture .content .item {
        flex: unset;
        padding: 30px;
    }
    
    .history {
        padding: 60px 0;
    }
    
    .year-swiper .swiper-wrapper {
        height: 350px;
    }
    
    .history .navigation {
        display: none;
    }
    
    .history .year-swiper .item {
        width: 78%;
        padding: 0 10px;
        flex-direction: column;
        align-items: unset;
    }
    
    .history .year-swiper .item .left {
        font-size: 140px;
        padding: unset;
    }
    
    .history .year-swiper .item .label {
        font-size: 28px;
    }
    
    .year-pagination {
        height: 100%;
        flex-direction: column;
        bottom: unset !important;
        right: 10px !important;
        overflow-y: scroll;
        z-index: 10;
        padding-left: 20px;
    }
    
    .year-pagination .bullet {
        margin: 2px 0 !important;
    }
    
    .year-pagination .bullet::before {
        top: 50%;
        left: -15px;
        transform: translateY(-50%);
    }
    
    .certificate {
        padding: 60px 0;
    }
}