@media screen and (max-width: 750px) and (min-width: 320px) {
  .w1400 {
    width: 100%;
    padding: 0 0.32rem;
    margin: 0 auto;
  }
  .home_video .text_box a{
      display: none;
  }
  header {
    display: none;
  }
  .m_head {
    display: flex;
    align-items: center;
    justify-content: space-between;
    padding: 0 0.32rem;
    background: #fff;
    position: sticky;
    top: 0;
    z-index: 10000;
  }
  .m_head .logo {
    font-size: 0;
  }
  .m_head .logo p {
    font-size: 0.36rem;
  }
  .m_head .logo img {
    width: 1.6rem;
  }
  .m_head .menu svg {
    width: 0.6rem;
    height: auto;
  }
  .mask {
    opacity: 0;
    transition: all 0.36s;
  }
  .mm_ .mask.m_act {
    width: 100%;
    height: 100vh;
    background: rgba(0, 0, 0, 0.6);
    position: fixed;
    top: 0;
    left: 0;
    z-index: 100000;
    opacity: 1;
  }
  .nav {
    position: fixed;
    top: 0;
    left: -100%;
    z-index: 100001;
    width: 4rem;
    height: 100vh;
    transition: all 0.5s;
    background: #fff;
  }
  .nav ul li {
    text-align: center;
  }
  .nav ul a {
    font-size: 0.32rem;
    color: #333;
  }
  .nav p {
    text-align: center;
    margin-top: 1rem;
  }
  .nav p img {
    width: 2rem;
  }
  .mm_ .nav.n_act {
    left: 0;
  }
  .language_switch {
    display: flex;
    margin-top: 0.6rem;
  }
  .language_switch .item {
    display: flex;
    align-items: center;
    margin-left: 0.8rem;
    font-size: 0.28rem;
  }
  .language_switch .item svg {
    width: 0.52rem;
    height: 0.52rem;
  }
  .home_pro {
    margin: 0.8rem 0;
  }
  .home_pro .title_box {
    text-align: center;
  }
  .home_pro .title_box h3 {
    font-size: 0.4rem;
  }
  .home_pro .title_box p {
    font-size: 0.36rem;
    margin-top: 10px;
  }
  .home_pro .main {
    display: flex;
    flex-wrap: wrap;
    margin-top: 0.4rem;
  }
  .home_pro .main .item {
    width: 100%;
    margin-right: 0;
    border: 1px solid #eeeeee;
    margin-bottom: 0.4rem;
  }
  .home_pro .main .item:hover .text_box {
    background: #003e92;
  }
  .home_pro .main .item:hover .text_box p {
    color: #fff;
  }
  .home_pro .main .item img {
    width: 100%;
  }
  .home_pro .main .item .text_box {
    padding: 0.2rem;
    text-align: center;
    transition: all 0.35s;
  }
  .home_pro .main .item .text_box p {
    margin: 10px 0;
    transition: all 0.35s;
  }
  .home_pro .main .item .text_box p:first-child {
    font-size: 0.32rem;
  }
  .home_pro .main .item .text_box p:last-child {
    font-size: 0.28rem;
  }
  .home_video {
    margin: 0.8rem 0;
  }
  .home_video .title_box {
    text-align: center;
  }
  .home_video .title_box h3 {
    font-size: 0.4rem;
  }
  .home_video .title_box p {
    font-size: 0.32rem;
    margin-top: 10px;
  }
  .home_video .worp {
    width: 100%;
    height: 400px;
    margin-top: 0.6rem;
    position: relative;
  }
  .home_video .worp .text_box {
    width: 6rem;
    height: 6rem;
    border-radius: 100%;
    /*background: rgba(250, 250, 250, 0.8);*/
    text-align: center;
    padding: 1rem;
    position: absolute;
    top: 50%;
    left: 50%;
    transform: translate(-50%, -50%);
  }
  .home_video .worp .text_box h3 {
    font-size: 0.32rem;
    margin-bottom: 0.4rem;
    font-weight: normal;
  }
  .home_video .worp .text_box .p {
    font-size: 0.28rem;
    color: #666666;
    line-height: 1.5;
  }
  .home_board {
    background: #f5f5f5;
    padding: 0.8rem 0;
  }
  .home_board .title_box {
    display: flex;
  }
  .home_board .title_box .left h3 {
    font-size: 0.4rem;
  }
  .home_board .title_box .left p {
    font-size: 0.32rem;
    margin-top: 10px;
  }
  .home_board .main {
    margin-top: 0.8rem;
  }
  .home_board .main p {
    font-size: 0.28rem;
  }
  .home_board .main form {
    display: flex;
    flex-direction: column;
    margin-top: 0.6rem;
  }
  .home_board .main form input {
    width: 100%;
    border: 1px solid #dddddd;
    outline: none;
    background: #fff;
    margin-right: 10px;
    height: 0.8rem;
    padding-left: 0.32rem;
    margin-bottom: 0.28rem;
  }
  .home_board .main form button {
    padding: 0.24rem 0;
    flex: 1;
    height: 0.8rem;
    border: none;
    outline: none;
    background: #003e92;
    color: #fff;
  }
  footer {
    width: 100%;
    height: auto;
    padding: 0.4rem 0;
    background: #09172b;
  }
  footer .w1400 {
    text-align: center;
    line-height: 1.5;
    font-size: 14px;
    color: #999999;
  }
  .banner img {
    width: 100%;
    height: 5rem;
    object-fit: cover;
  }
  .crumbs {
    border-bottom: 1px solid #eeeeee;
    margin-bottom: 0.8rem;
  }
  .crumbs .worp {
    display: flex;
    align-items: center;
    height: 0.8rem;
  }
  .crumbs .worp svg {
    width: 0.48rem;
    height: 0.48rem;
  }
  .crumbs .worp p {
    font-size: 0.24rem;
    color: #888;
  }
  .crumbs .worp span {
    font-size: 0.24rem;
  }
  .video_ .title_box {
    text-align: center;
    margin-bottom: 0.6rem;
  }
  .video_ .title_box h3 {
    font-size: 0.4rem;
  }
  .video_ .title_box p {
    font-size: 0.32rem;
    margin-top: 10px;
  }
  .video_ .video_box {
    width: 100%;
    height: 6rem;
    margin-bottom: 0.6rem;
  }
  .video_ .video_box video {
    width: 100%;
    height: 100%;
    object-fit: cover;
  }
  .video_ .rich_box {
    padding-bottom: 1rem;
  }
  .video_ .rich_box .t {
    font-size: 0.36rem;
    border-bottom: 1px solid #eeeeee;
    margin-bottom: 0.4rem;
    padding-bottom: 0.4rem;
  }
  .video_ .rich_box .content p {
    font-size: 0.32rem;
    line-height: 1.8;
  }
  .contact .title_box {
    text-align: center;
    margin-bottom: 0.6rem;
  }
  .contact .title_box h3 {
    font-size: 0.4rem;
  }
  .contact .title_box p {
    font-size: 0.32rem;
    margin-top: 10px;
  }
  .contact .main1 {
    display: flex;
    justify-content: space-between;
    margin-bottom: 0.6rem;
  }
  .contact .main1 .item {
    width: 32%;
    display: flex;
    flex-direction: column;
    align-items: center;
  }
  .contact .main1 .item .icon_box {
    width: 2rem;
    height: 2rem;
    border: 2px solid #888888;
    display: flex;
    align-items: center;
    justify-content: center;
  }
  .contact .main1 .item .icon_box img {
    max-width: 80%;
  }
  .contact .main1 .item p {
    font-size: 0.32rem;
    color: #222;
    margin: 16px 0;
  }
  .contact .main1 .item span {
    width: 100%;
    text-align: center;
    font-size: 0.28rem;
    color: #555555;
    line-height: 1.4;
    word-wrap: break-word;
  }
  .contact .main2 {
    width: 100%;
    height: 6rem;
    background: url(../image/contact_ad.png) no-repeat center / cover;
    margin-bottom: 1.6rem;
  }
  .contact .main3 {
    display: none;
    margin-bottom: 1.4rem;
  }
  .contact .main3 .left p {
    font-size: 0.36rem;
    margin-bottom: 0.36rem;
  }
  .contact .main3 .right {
    flex: 1;
    display: flex;
    justify-content: flex-end;
  }
  .contact .main3 .right .item {
    margin-left: 0.44rem;
  }
  .contact .main3 .right .img_box {
    width: 4rem;
    height: 4rem;
    border: 1px solid #eeeeee;
    display: flex;
    align-items: center;
    justify-content: center;
  }
  .contact .main3 .right .img_box img {
    max-width: 80%;
  }
  .contact .main3 .right p {
    text-align: center;
    margin-top: 0.4rem;
    font-size: 0.36rem;
  }
  .pro_nav {
    display: grid;
    grid-template-columns: repeat(3, 1fr);
    grid-gap: 10px;
  }
  .pro_nav a {
    border: 1px solid #dddddd;
    text-align: center;
    font-size: 0.28rem;
    padding: 0.2rem 0;
    border-radius: 0.6rem;
  }
  .pro_nav .act {
    background: #003e92;
    color: #fff;
  }
  .pro_info .pic {
    width: 100%;
    position: relative;
    margin: 0 auto;
  }
  .pro_info .pic .gallery-top {
    height: 6rem;
    border: 1px solid #ccc;
  }
  .pro_info .pic .gallery-top .swiper-slide {
    display: flex;
    justify-content: center;
    align-items: center;
  }
  .pro_info .pic .gallery-top .swiper-slide img {
    width: 100%;
    height: 100%;
    object-fit: cover;
  }
  .pro_info .pic .swiper-button-prev {
    top: initial;
    left: 0;
    background: #8c8c8c url(../image/next.png) no-repeat center;
    width: 0.48rem;
    height: 1.2rem;
    background-size: 60%;
    transform: rotate(180deg);
    bottom: 0;
    transition: all 0.3s;
  }
  .pro_info .pic .swiper-button-next::after,
  .pro_info .pic .swiper-button-prev::after {
    content: '';
  }
  .pro_info .pic .swiper-button-next {
    top: initial;
    right: 0;
    background: #8c8c8c url(../image/next.png) no-repeat center;
    width: 0.48rem;
    height: 1.2rem;
    background-size: 60%;
    bottom: 0;
    transition: all 0.3s;
  }
  .pro_info .pic .gallery-thumbs {
    width: 90%;
    height: 1.2rem;
    margin-top: 0.4rem;
  }
  .pro_info .pic .gallery-thumbs .swiper-slide {
    border: 2px solid #e5e5e5;
    cursor: pointer;
    opacity: 0.8;
  }
  .pro_info .pic .gallery-thumbs .swiper-slide-thumb-active {
    opacity: 1;
    border-color: lightcoral;
  }
  .pro_info .content {
    margin-top: 0.6rem;
    margin-bottom: 0.6rem;
  }
  .pro_info .content .title {
    font-size: 0.36rem;
    border-bottom: 1px solid #ccc;
    margin-bottom: 0.6rem;
    padding-bottom: 0.4rem;
  }
  .page {
    display: flex;
    justify-content: center;
    margin-top: 0.6rem;
  }
  .page a,
  .page span {
    display: inline-block;
    width: 0.4rem;
    height: 0.4rem;
    line-height: 0.4rem;
    text-align: center;
    font-size: 0.24rem;
    background: #eeeeee;
    margin: 0 0.1rem;
  }
  .page .active span {
    background: #18509c;
    color: #fff;
  }
}