@media (min-width: 992px) {
  #banner {
    width: 100%;
    height: 580px;
  }
}
@media (max-width: 768px) {
  #banner {
    width: 100%;
    height: 260px;
  }
  .numcon .row {
    margin-left: 8px;
    margin-right: 8px;
  }
  .num {
    margin-top: -70px;
  }
  .num .item {
    padding: 15px;
    line-height: 18px;
  }
  .about .img {
    margin-left: 0px;
  }
  .about_imglist img {
    width: 100%;
  }
  .companycon .itemcon .item:first-child {
    padding-left: 5px;
  }
  .companycon .itemcon .item:last-child {
    padding-right: 5px;
  }
  .footer .txt {
    margin-top: 20px;
    line-height: 26px;
  }
  .num .item:nth-child(3),
  .num .item:nth-child(4) {
    padding-top: 0;
  }
  .nav-item {
    padding: 5px;
  }
  .navbg {
    height: unset;
  }
  .tit h1 {
    font-size: 32px;
  }
  .aboutcon .text h2 {
    font-size: 24px;
  }
  .num .text h1 {
    font-size: 24px;
  }
  .footer {
    padding: 30px;
  }
  .footer p {
    line-height: 22px;
  }
  .footer a {
    margin-top: 8%;
  }
  .businesscon .container .item .txt {
    padding-top: 18%;
  }
  .aboutcon img {
    margin-bottom: 1rem;
  }
  .sub_loc .row div {
    font-size: 16px;
  }
  .com_part .con h3,
  .com_part .con h3.hh {
    font-size: 1.5rem;
    line-height: 2.6rem;
  }
  .com_part .con h4 {
    font-size: 2rem;
  }
  .business_part .bg {
    display: none;
  }
  .business_part .txt {
    position: static;
    margin: 30% 40px 0 40px;
  }
  .business_part.business2 .txt,
  .business_part.business4 .txt,
  .business_part.business6 .txt {
    position: static;
    margin: -80px 40px 0 40px;
  }
  .overseas .hd .row {
    margin: 0;
    padding: 0;
  }
  .overseas .hd li {
    margin: 0 0;
  }
}
/* 4. 大屏幕下 lg 大于等于1200 */
@media screen and (min-width: 1200px) {
  .nav-item {
    padding: 20px;
  }
  #banner {
    width: 100%;
    height: 980px;
  }
}