.big_mask {
    display: none;
    width: 100%;
    height: 100vh;
    background: rgb(0, 0, 0, .5);
    position: fixed;
    top: 0;
    left: 0 ;
    z-index: 999;
}
.big_mask img {
    margin: 5% 0;
    width: 100%;
    height: 80%;
}
.Introduction {

    width: 79%;
    margin: 0 auto;
}
.banner {
    width: 100%;
    margin-bottom: 20px;
}
.banner img {
    width: 100%;
    height: 100%;
}
.Introduction .Introduction_nav {
    width: 100%;
    display: flex;
    justify-content: center;
}
.Introduction .Introduction_nav .nav_item {
    box-sizing: border-box;
    cursor: pointer;
    padding:  10px;
    margin-right: 3%;
    color: #999;
    font-size: 18px;
    text-align: center;
}
.Introduction .Introduction_nav .nav_item:hover {
    color: #E77917;
    border-bottom: 2px solid #E77917;
}
.Introduction .Introduction_nav .active {
    color: #E77917;
    border-bottom: 2px solid #E77917;
}
.Introduction .Introduction_title {
    margin-top: 50px;
    text-align: center;
}
.Introduction .Introduction_title h1 {
    font-size: 43px;
    color: #999999;
    opacity: 0.1;
}
.Introduction .Introduction_title h2 {
    margin-top: -33px;
    font-size: 28px;
    color: #333333;
}
.Introduction .Introduction_content {
    font-size: 16px;
    display: flex;
    align-items: center;
    flex-wrap: wrap;
    justify-content: space-around;
    width: 100%;
}
.Introduction .Introduction_content .content_item  {
    overflow: hidden;
    margin: 40px 0;
    width: 46%;
}
.Introduction .Introduction_content .content_item:last-child {
    padding: 30px 0;
}
.Introduction .Introduction_content .content_item img {
    width: 100%;
    transition: all .5s;
}
.swiper-slide img {
    width: 100%;
    transition: all .5s;
}
.actives {
    transform: scale(1.05);
}
.Introduction .Introduction_content .content_item p {

    line-height: 33px;
    text-indent:2em;
}
.Introduction .Introduction_content .content_item p:nth-child(2) {
    margin: 20px 0;
}
.style {
    overflow: hidden;
    width: 100%;
    padding: 30px 0;
    padding-bottom: 105px;
}
.style .style_content {

    width: 79%;
    margin: 0 auto;
}
.style .style_title {
    text-align: center;
}
.style .style_title h1 {
    font-size: 43px;
    color: #999999;
    opacity: 0.1;
}
.style .style_title h2 {
    /* margin-top: -33px; */
    font-size: 28px;
    color: #333333;
}
.style .style_swiper {
    margin-top: 30px;
    margin-left: 10%;
    width: 90%;
}
.swiper-container {
    width: 100%;
    height: 100%;
  }

  .swiper-slide {
    text-align: center;
    font-size: 18px;
    background: #fff;

    /* Center slide text vertically */
    display: -webkit-box;
    display: -ms-flexbox;
    display: -webkit-flex;
    display: flex;
    -webkit-box-pack: center;
    -ms-flex-pack: center;
    -webkit-justify-content: center;
    justify-content: center;
    -webkit-box-align: center;
    -ms-flex-align: center;
    -webkit-align-items: center;
    align-items: center;
  }
  .swiper-slide  img {
      width: 115%;
  }
  .swiper-container .swiper-button-next, .swiper-container .swiper-button-prev {
    width: 30px;
    height: 20px;
  }
  .swiper-container .swiper-button-next {
    position: absolute;
    top: -20px;
    right: 17%;
  }
  .swiper-container .swiper-button-prev {
    position: absolute;
    top: -20px;
    left: 77%;
  }
  .swiper-container .swiper-button-next img, .swiper-container .swiper-button-prev img {
    width: 100%;
    height: 100%;
  }
  .swiper-container .swiper-button-prev:after{
    content: '';
  }
  .swiper-container .swiper-button-next:after {
    content: '';
  }
  .saver {
    width: 80%;
    margin: 0 auto;
  }
.saver .saver_title {
    margin-top: 50px;
    text-align: center;
}
.saver .saver_title h1 {
    font-size: 43px;
    color: #999999;
    opacity: 0.1;
}
.saver .saver_title h2 {
    margin-top: -33px;
    font-size: 28px;
    color: #333333;
}
.saver .saver_content {
    width: 100%;
    margin-top: 40px;
    display: flex;
    flex-wrap: wrap;
    justify-content: space-between;
}
.saver .saver_content .sacer_item {
    width: 37%;
    margin-bottom: 60px;
    padding: 50px 70px;
    box-shadow: 0px 0px 20px rgba(0, 0, 0, 0.12);
    border-radius: 4px;
}
.video {
    margin-top: 0;
}
.saver .saver_content .sacer_item .step {
    width: 60px;
    height: 60px;
    text-align: center;
    font-size: 30px;
    line-height: 65px;
    background-color: #000;
    box-shadow: 9px 0px 3px rgb(0 0 0 / 45%);
    color: #fff;
    border-radius: 50%;
}
.saver .saver_content .sacer_item>h1 {
    margin: 15px 20px;
    font-size: 24px;
    color: #333333;
}
.saver .saver_content .sacer_item>p {
    padding-left: 20px;
    font-size: 16px;
    line-height: 26px;
    color: #333333;
}
.swiper-container .swiper-button-next {
    right: 16%;
}
.swiper-container .swiper-button-prev {
    left: 78%;
}
@media screen and (max-width: 1800px) {
    .Introduction .Introduction_content .content_item:last-child {
        padding:  0;
    }
    .Introduction .Introduction_content .content_item p {
        line-height: 1.7;
    }
}
@media screen and (max-width: 1500px) {
    .saver {
        width: 90%;
      }

    .Introduction .Introduction_content .content_item p {
        line-height: 1.5;
        font-size: 15px;
    }
}
@media screen and (max-width: 1400px) {
    .Introduction, .saver {
        width: 85%;
    }
    .Introduction .Introduction_content .content_item {
        width: 48%;
    }
}
@media screen and (max-width: 1280px) {
    .big_mask img {
        margin: 13% 0;
        width: 100%;
        height: 60%;
    }
    .swiper-slide img {
        width: 125%;
    }
    .Introduction .Introduction_title {
        margin-top: 30px;
        text-align: center;
    }
    .style {
        padding: 40px 0;
    }
    .style .style_swiper {
        margin-top: 25px;
    }
    .Introduction, .saver {
        width: 97%;
    }
    .Introduction .Introduction_content .content_item {
        margin: 21px 0;
        width: 46%;
    }
    .Introduction .Introduction_title h1 {
        font-size: 38px;
    }
    .Introduction .Introduction_title h2 {
        margin-top: -29px;
        font-size: 25px;
        color: #333333;
    }
    .style .style_title h1 {
        font-size: 38px;
    }
    .style .style_title h2 {
        margin-top: -29px;
        font-size: 25px;
        color: #333333;
    }
    .saver .saver_title h1 {
        font-size: 38px;
    }
    .saver .saver_title h2 {
        margin-top: -29px;
        font-size: 25px;
        color: #333333;
    }
    .saver .saver_title {
        margin-top: 10px;
        text-align: center;
    }
    .saver .saver_content {
        margin-top: 20px;
    }
    .saver .saver_content .sacer_item {
        width: 42%;
        margin-bottom: 45px;
        padding:25px 30px;
        box-shadow: 0px 0px 20px rgb(0 0 0 / 12%);
        border-radius: 4px;
    }
    .saver .saver_content .sacer_item .step {
        width: 50px;
        height: 50px;
        font-size: 26px;
        line-height: 50px;
    }
    .saver .saver_content .sacer_item>h1 {
        margin: 10px 20px;
        font-size: 22px;
    }
    .swiper-container .swiper-button-next {
        right: 12%;
    }
    .swiper-container .swiper-button-prev {
        left: 80%;
    }
    .Introduction .Introduction_content .content_item p {
        line-height: 2;
        font-size: 14px;
        /* display: -webkit-box;
        overflow: hidden;
        -webkit-box-orient: vertical;
        -webkit-line-clamp: 3; */
    }

}
@media screen and (max-width: 1024px) {
    .swiper-slide img {
        width: 135%;
    }
    .Introduction .Introduction_content .content_item p {
        line-height: 1.8;
        font-size: 14px;
        /* display: -webkit-box;
        overflow: hidden;
        -webkit-box-orient: vertical;
        -webkit-line-clamp: 3; */
    }
    .saver .saver_content .sacer_item {
        width: 44%;
        margin-bottom: 40px;
        padding: 25px 20px;

    }
    .saver .saver_content .sacer_item>h1 {
        font-size: 20px;
    }
    .saver .saver_content .sacer_item>p {
        font-size: 14px;
    }
    .saver .saver_content .sacer_item .step {
        width: 50px;
        height: 50px;
        text-align: center;
        font-size: 26px;
        line-height: 50px;
        background-color: #000;
        box-shadow: 9px 0px 3px rgb(0 0 0 / 45%);
        color: #fff;
        border-radius: 50%;
    }

}
@media screen and (max-width: 860px) {
    .swiper-slide img {
        width: 145%;
    }
    .saver .saver_content .sacer_item>p {
        height: 52px;
        display: flex;
        align-items: center;
    }
    .saver .saver_content .sacer_item {
        width: 85%;
        margin: 0 auto;
        margin-bottom: 45px;
        padding: 30px 20px;
    }
    .Introduction .Introduction_content .content_item {
        margin: 35px 0;
        width: 46%;
    }
    .Introduction .Introduction_title {
        margin-top: 35px;
        text-align: center;
    }
    .Introduction .Introduction_content .content_item p {
        line-height: 1.7;
        font-size: 14px;
        /* display: -webkit-box;
        overflow: hidden;
        -webkit-box-orient: vertical;
        -webkit-line-clamp: 3; */
    }
    .Introduction .Introduction_nav .nav_item {
        box-sizing: border-box;
        cursor: pointer;
        padding: 8px;
        margin-right: 3%;
        font-size: 12px;
    }

}

@media screen and (max-width: 750px) {
    .Introduction .Introduction_nav {
        margin-top: 15px;
    }

    .big_mask img {
        margin: 30% 0;
    }
    .Introduction .Introduction_content .content_item p {
        margin-bottom: 10px;
    }
    .swiper-slide img {
        width: 100%;
    }
    .Introduction .Introduction_nav .nav_item {
        padding: 5px;
        text-align: center;
    }
    .Introduction .Introduction_content .content_item  {
        margin: 0 auto;
        margin-top: 15px;
        width: 97%;
    }
    .Introduction .Introduction_content {
        padding-bottom: 15px;
    }
    .swiper-container .swiper-button-next,  .swiper-container .swiper-button-prev {
        top: 114%;
    }
    .swiper-container .swiper-button-next {
        right: 8%;
    }
    .swiper-container .swiper-button-prev {
        left: 80%;
    }
    .saver .saver_content .sacer_item {
        width: 90%;

    }
    .style {

        padding-top: 40px;
    }
    .style .style_title h1 {
        font-size: 35px;
        color: #999999;
        opacity: 0.1;
    }
    .style .style_title h2 {
        margin-top: -27px;
        font-size: 23px;
        color: #333333;
    }
    .saver .saver_title h1 {
        font-size: 35px;
        color: #999999;
        opacity: 0.1;
    }
    .saver .saver_title h2 {
        margin-top: -27px;
        font-size: 23px;
        color: #333333;
    }
    .Introduction .Introduction_title h2 {
        margin-top: -27px;
        font-size: 23px;
        color: #333333;
    }
    .Introduction .Introduction_title h1 {
        font-size: 35px;
        color: #999999;
        opacity: 0.1;
    }




}
@media screen and (max-width: 500px) {
    .saver .saver_content .sacer_item>h1 {
        font-size: 18px;
    }

    .swiper-container .swiper-button-next,  .swiper-container .swiper-button-prev {
        top: 117%;
    }

    .swiper-container .swiper-button-next {
        right: 6%;
    }
    .swiper-container .swiper-button-prev {
        left: 76%;
    }


}
@media screen and (max-width: 375px) {
    .banner img {
        height: 160px;
     }
    .Introduction .Introduction_nav .nav_item {
        padding: 0px;
    }
    /* header nav .more {
        top: 8px;
        width: 20px;
        height: 20px;
    } */
    .big_mask img {
        margin: 75% 0;
        height: 30%;
    }
    .swiper-slide img {
        width: 105%;
    }
    .swiper-container .swiper-button-next,  .swiper-container .swiper-button-prev {
        top: 127%;
    }

    .swiper-container .swiper-button-next {
        right: 6%;
    }
    .swiper-container .swiper-button-prev {
        left: 74%;
    }
    .style .style_title h1 {
        font-size: 29px;
        color: #999999;
        opacity: 0.1;
    }
    .style .style_title h2 {
        margin-top: -23px;
    font-size: 20px;
        color: #333333;
    }
    .saver .saver_title h1 {
        font-size: 29px;
        color: #999999;
        opacity: 0.1;
    }
    .saver .saver_title h2 {
        margin-top: -23px;
        font-size: 20px;
        color: #333333;
    }
    .Introduction .Introduction_title h2 {
        margin-top: -23px;
        font-size: 20px;
        color: #333333;
    }
    .Introduction .Introduction_title h1 {
        font-size: 29px;
        color: #999999;
        opacity: 0.1;
    }

    .saver .saver_content .sacer_item {
        width: 90%;
        margin: 0 auto;
        margin-bottom: 25px;
        padding: 20px;
    }
    .saver .saver_content .sacer_item .step {
        width: 35px;
        height: 35px;
        font-size: 18px;
        line-height: 35px;
    }
    .saver .saver_content .sacer_item>h1 {
        margin: 8px 15px 3px;
    }
    .saver .saver_content .sacer_item>p {
        padding-left: 15px;
        font-size: 14px;
        line-height: 23px;
        color: #333333;
        height: 69px;
    }
}