@media (max-width: 750px) {
  body
  /* header */
  header .top-menu {
    width: 100%;
    padding: 0 0.5rem;
    line-height: 1rem;
    height: 1rem;
    font-size: 0.32rem;
    position: fixed;
    top: 0;
    left: 0;
    z-index: 1000;
    color: #fff;
    background-color: #192f77;
  }
  header .top-menu img:first-child {
    width: 2rem;
    height: 0.5rem;
  }
  header .mobile-adapter a {
    display: flex;
    justify-content: center;
    align-items: center;
  }
  header .mobile-adapter a img:first-child {
    width: 2rem;
    height: 0.5rem;
  }
  header .mobile-adapter img:last-child {
    width: 0.5rem;
    width: 0.5rem;
  }
  header .comtainer {
    width: 100vw;
    height: 100vh;
    display: none;
    position: fixed;
    top: 0;
    left: 0;
    z-index: 1000;
    background-color: #fff;
  }
  header .comtainer > div {
    height: 1rem;
    padding: 0 0.7rem;
    /* background-color: pink; */
  }

  header .comtainer > div > img:first-child {
    width: 1.93rem;
    height: 0.48rem;
  }

  header .comtainer > div > img:last-child {
    width: 0.35rem;
    height: 0.35rem;
  }

  header .web-menu {
    color: #000;
    flex-direction: column;
    font-size: 0.29rem;
    padding: 0.4rem 0.7rem 0;
    height: calc(100vh - 3rem);
    align-items: start;
    overflow: auto;
    box-sizing: border-box;
    overflow: scroll;
    /* background-color: lightblue; */
    line-height: 60px;
  }
  header .web-menu li .active {
    color: #4e74ff;
  }
  header .web-menu .fold-menu {
    display: none;
  }
  header .web-menu .fold-menu .base-menu {
    display: none;
  }
  header .web-menu .fold-menu > ul {
    display: flex;
    flex-direction: column;
    justify-content: start;
    align-items: start;
    line-height: 0.8rem;
  }
  header .web-menu .fold-menu .menu-top3 {
    display: flex;
    flex-direction: column;
    justify-content: start;
    align-items: start;
  }
  header .menu-top1 {
    position: relative;
  }
  header .menu-top1 span {
    font-size: 17px;
  }
  header .menu-top1:not(.active)::after {
    content: "";
    display: inline-block;
    position: absolute;
    right: -0.2rem;
    top: 50%;
    transform: translate(-50%, -50%);
    width: 0;
    height: 0;
    border-left: 0.2rem solid transparent;
    border-right: 0.2rem solid transparent;
    margin-left: 0.1rem;
    vertical-align: middle;
    top: 50%;
    border-top: 0.2rem solid #fff;
  }
  header .menu-top1:not(.active)::before {
    content: "";
    display: inline-block;
    position: absolute;
    right: -0.2rem;
    top: 0.5rem;
    transform: translate(-50%, -50%);
    width: 0;
    height: 0;
    border-left: 0.2rem solid transparent;
    border-right: 0.2rem solid transparent;
    margin-left: 0.1rem;
    vertical-align: middle;
    top: calc(50% + 2px);
    border-top: 0.2rem solid #212121;
  }
  header .active::after {
    content: "";
    display: inline-block;
    position: absolute;
    right: -0.2rem;
    top: 50%;
    transform: translate(-50%, -50%);
    width: 0;
    height: 0;
    border-left: 0.2rem solid transparent;
    border-right: 0.2rem solid transparent;
    margin-left: 0.1rem;
    vertical-align: middle;
    top: 50%;
    border-bottom: 0.2rem solid #fff;
  }
  header .active::before {
    content: "";
    display: inline-block;
    position: absolute;
    right: -0.2rem;
    top: 0.5rem;
    transform: translate(-50%, -50%);
    width: 0;
    height: 0;
    border-left: 0.2rem solid transparent;
    border-right: 0.2rem solid transparent;
    margin-left: 0.1rem;
    vertical-align: middle;
    top: calc(50% - 2px);
    border-bottom: 0.2rem solid #212121;
  }
  header .web-menu .mobile-adapter .menu-top1::after,
  header .web-menu .mobile-adapter .menu-top1::before {
    display: none;
  }
  header .menu-top2,
  header .menu-top3 {
    padding-left: 0.3rem;
  }
  header a {
    color: #000;
  }
  header .menu_bottom {
    position: absolute;
    left: 0;
    bottom: 10%;
    width: 100%;
    background-color: transparent;
  }
  header .menu_bottom .contact_btn {
    font-weight: 600;
    font-size: 0.29rem;
    width: 6rem;
    height: 0.73rem;
    background-color: #003199;
    color: #fff;
    border-radius: 0.13rem;
  }
  header .menu_bottom .contact_btn a {
    text-decoration: none;
    color: #fff;
    transition: 0.4s;
  }
}

@media (min-width: 750px) {
  /* header */
  header {
    position: fixed;
    top: 0;
    left: 0;
    z-index: 1000;
    height: 75px;
    width: 100%;
    /* min-width: 1280px; */
    max-width: 100vw;
    background-color: rgb(17, 30, 54);
    padding: 0 40px;
    color: #fff;
    font-family: AlibabaSans-Regular;
    font-weight: 400;
    font-size: 18px;
    color: #ffffff;
  }
  header .comtainer {
    height: 75px;
    display: flex;
    justify-content: space-between;
    align-items: center;
  }
  /* comtainer */
  header .comtainer .logo,
  header .comtainer .person {
    flex: 1;
  }
  /* logo */
  .logo img {
    width: 108px;
  }
  /* person */
  .person .contact {
    width: 115px;
    height: 34px;
    border: 1px solid #fff;
    border-radius: 7px;
  }
  .person > div {
    margin-left: 15px;
  }
  /* web-menu */
  .web-menu {
    flex: 2;
    height: 100%;
  }
  .web-menu li {
    flex: 1;
    height: 100%;
  }
  .web-menu li .menu-top1 {
    height: 100%;
    width: fit-content;
    position: relative;
  }
  .web-menu li .menu-top1 span {
    line-height: 75px;
  }
  .web-menu li .menu-top1 img {
    margin-left: 10px;
  }
  .web-menu li .active::after {
    content: "";
    width: 100%;
    height: 3px;
    background-color: #20479e;
    position: absolute;
    bottom: 0;
    left: 50%;
    transform: translateX(-50%);
  }
  /* fold-menu */
  .fold-menu {
    display: none;
    width: 100vw;
    position: fixed;
    top: 75px;
    left: 0;
    max-height: 540px;
    padding: 0 40px 20px 40px;
    font-weight: 400;
    font-size: 17px;
    color: #ffffff;
    background-color: #0c1526;
  }
  .fold-menu > ul {
    align-items: start;
    padding: 0 25%;
  }
  .fold-menu > ul > li {
    min-width: 120px;
  }
  .fold-menu > ul > li p {
    margin: 25px 0 15px 0;
    text-wrap: nowrap;
    font-weight: 300;
    font-size: 15px;
    color: #ffffffb6 !important;
  }
  .menu-top1 > img {
    margin-left: 10px;
  }
  header .bottom-icon {
    padding: 45px 0 0 25%;
    bottom: 20px;
  }
  header .bottom-icon img {
    width: 23px;
    height: 23px;
    margin-right: 45px;
  }
  /* menu-top3 */
  .menu-top3 {
    align-items: start;
    flex-direction: column;
    margin-right: 32px;
  }
  .menu-top3 li {
    line-height: 50px;
    font-weight: 600;
  }
  .menu-top3 li a:hover {
    text-decoration: unset;
  }
}