@media screen and (min-width: 1200px) {
  .home-abouts.about-us,
  .home-abouts .about-us-item {
    height: 80vh;
  }
}
@media screen and (max-width: 1500px) {
  .about-text {
    width: 91%;
  }
}
@media screen and (max-width: 1200px) {
  .mantle {
    display: none;
  }
  .menu-area {
    margin-right: 70px;
  }
  /* .mantle-item {
    z-index: 0;
  } */ 
  .banner-con .banner-con-video .video-js,
  .banner-con .banner-con-video video {
    object-fit: contain;
    height: auto;
  }
  .banner-con-video .banner-con-box {
    position: absolute;
    top: 50%;
    transform: translate(0, -50%);
    height: auto;
  }
  .banner-text {
    position: relative;
    bottom: 10px;
    margin-top: 60px;
    z-index: 99;
  }
  .cases_container {
    display: none;
  }
  .case-1024 {
    display: block;
    height: 100vh;
  }
  .case-img-1024 {
    position: absolute;
    top: 50%;
    width: 100%;
    transform: translate(0, -50%);
  }
  .join-us-main {
    /* background: url('../images/join_us_1024.png') no-repeat;
    background-size: cover; */
  }
  .recruit-info-list {
    width: 80%;
  }
  .join-desc {
    width: 84%;
  }
  .recruit-info {
    padding: 94px 0;
  }
  .branch-item {
    margin-top: 60px;
  }
  .office-branch {
    margin-top: 120px;
  }
  .office-title {
    font-size: 40px;
    line-height: 56px;
  }
  .about-us-right {
    width: 100%;
  }
  .about-us {
    display: block;
    height: auto;
  }
  .about-us-item1 {
    height: 100vh;
    width: 69%;
    padding-left: 0;
    margin: 0 auto;
    display: flex;
    align-items: center;
  }
  .about-us-item1 p {
    font-size: 36px;
    line-height: 85px;
  }
  .about-us-item {
    margin-right: 2px;
    padding: 0 32px 0 28px;
  }
  .about-text i {
    font-size: 60px;
    font-weight: 100;
  }
  .about-us-info {
    display: none;
  }
  .about-us-icon-box {
    position: relative;
    bottom: 0;
    /* width: auto; */
    /* margin: 0 auto; */
    margin-top: 60px;
    color: #ccc;
    display: block;
  }
  .about-us-icon {
    margin-bottom: 20px;
  }
  .about-us-icon:last-child {
    margin-bottom: 0;
  }
  .copyright {
    margin-top: 60px;
  }
}
@media screen and (max-width: 992px) {
  .case-1024 {
    height: 83vh;
  }
  .join-us-main {
    background: url('../images/join_us_1024.png') no-repeat;
    background-size: cover;
  }
  .join-desc {
    width: 86%;
  }
  .recruit-info-list {
    width: 92%;
  }
  
  .about-us-item1 p {
    font-size: 26px;
    line-height: 66px;
  }
  .about-us-item2 {
    background: url('../images/about_us1_768.png') no-repeat;
    background-size: cover;
  }
  .about-us-item3 {
    background: url('../images/about_us2_768.png') no-repeat;
    background-size: cover;
  }
  .about-us-item4 {
    background: url('../images/about_us3_768.png') no-repeat;
    background-size: cover;
  }
  .about-us-right {
    display: block;

  }
  .about-us-item {
    width: 100%;
    padding: 0;
    margin: 0;
    position: relative;
  }
  .about-text {
    width: 72%;
    /* margin: 0 auto; */
    position: absolute;
    top: 20%;
    left: 50%;
    transform: translate(-50%, 0)
  }
  .about-text i {
    font-size: 120px;
  }
  .about-text span {
    font-size: 20px;
  }
  .about-text p {
    font-size: 20px;
    line-height: 44px;
  }
  .tooltip {
    margin-left: 10px;
    font-size: 18px;
  }
  @media screen and (orientation:landscape) {
    /* css[横向定义样式]  */
    .banner-con .banner-con-video .video-js,
    .banner-con .banner-con-video video {
      object-fit: cover;
      height: 100%;
    }
    .banner-con-video .banner-con-box {
      position: relative;
      /* top: 50%;
      transform: translate(0, -50%); */
      height: 100%;
    }
    .banner-text {
      position: absolute;
      bottom: 33px;
      left: 50%;
      transform: translate(-50%, 0);
      margin-top: 0;
    }
  }
}


@media screen and (max-width: 768px) {
  .join-desc {
    letter-spacing: 8px;
  }
  .menu-area {
    margin-right: 53px;
  }
  .logo_img {
    display: none;
  }
  .logo_img_375 {
    display: block;
    width: 40px;
    height: 40px;
  }
  .menu-area {
    margin-right: 0;
    position: absolute;
    top: 70px;
    right: 0;
  }
  .menu-area-main {
    display: block;
    background: rgba(0, 0, 0, 0.7);
    padding: 18px 22px;
    margin-right: 0 !important;
  }
  .main-menu ul>li {
    display: block;
    margin-bottom: 50px;
  }
  .main-menu ul>li:last-child {
    margin-bottom: 0;
  }
}

@media screen and (max-width: 576px) {
  .banner-text li {
    font-size: 28px;
    line-height: 40px;
    margin-right: 60px;
  }
  .cases_container {
    display: block;
  }
  .case-1024 {
    display: none;
  }
  .case-item img {
    width: 25%;
    height: auto;
    padding: 1px;
    /* padding-top: 59%; */
    margin-bottom: 1px;
    background-size: 100%;
  }
  .join-title {
    width: 73%;
    text-align: left;
    font-size: 40px;
    line-height: 56px;
    letter-spacing: 2px;
    margin: 0 auto;
  }
  .join-desc {
    width: 73%;
    font-size: 12px;
    line-height: 22px;
    letter-spacing: 1px;
    text-align: left;
  }
  .text-mail {
    font-size: 18px;
    line-height: 25px;
  }
  .text-mail span {
    display: none;
  }
  .branch-content {
    margin-top: 10px;
    font-size: 12px;
    line-height: 17px;
  }
  .recruit-info {
    padding: 80px 0;
  }
  .recruit {
    padding: 45px 0;
  }
  .about-us-item1 {
    width: 73%;
  }
  .about-us-item1 p {
    font-size: 16px;
    line-height: 36px;
  }
  .about-us-icon-address img{
    margin-top: -18px;
  }
  .about-text i {
    font-size: 70px;
  }
  .about-text span,
  .about-text p {
    font-size: 14px;
    line-height: 24px;
  }
  .about-us-icon-box {
    padding: 0 55px;
  }
  .tooltip {
    font-size: 14px;
  }
  .copyright {
    font-size: 12px;
    text-align: center;
    padding: 30px 0;
  }
}
@media screen and (orientation:portrait) {
  /* css[竖向定义样式] */
  .banner-con .banner-con-video .video-js,
  .banner-con .banner-con-video video {
    object-fit: contain;
    height: auto;
  }
  .banner-con-video .banner-con-box {
    position: absolute;
    top: 50%;
    transform: translate(0, -50%);
    height: auto;
  }
  .banner-text {
    position: relative;
    bottom: 10px;
    margin-top: 60px;
    z-index: 99;
  }
}


/* @media screen and (max-width: 992px) {
    .banner-text {
      bottom: 33px;
    }
  } */