@media screen and (max-width: 500px) {
  #product {
    margin-top: 7rem;
  }
  .ser-search, .ser-search.container {
    padding: 0 2rem 2rem;
  }
  #product .ser-search input {
    font-size: 1.2rem;
    color: #898888;
    font-family: "Source Han Sans CN";
    letter-spacing: 1px;
    padding-left: .8rem;
    border-radius: 0;
  }
  #product .ser-search, .ser-search.container {
    padding: 0 2rem;
  }
  #product .ser-search input::-webkit-input-placeholder {
    font-size: 1.2rem;
    color: #898888;
    font-family: "Source Han Sans CN";
    letter-spacing: 1px;
  }
  #product .ser-search .sear-control {
    background-position: 5px 1.1rem;
  }
  #product .product-top .product-top-nav .only-title .div-left-title .h4-title a {
    font-size: 1.5rem;
    line-height: 1.2rem;
    color: #333333;
    font-family: "Source Han Sans CN";
  }
  #product .product-top .product-top-nav .only-title .div-left-title .img-img_sl {
    margin-right: 1rem;
  }
  #product .product-top .product-top-nav .only-title {
    padding-left: 0 2rem;
  }
  #product .product-top .product-top-nav ul {
    padding-top: 2rem;
    padding-left: 0;
  }
  #product .product-top .product-top-nav ul li {
    margin-bottom: .6rem;
    padding-left: 0;
  }
  
  #product .product-top .product-top-nav ul li:nth-child(1),
  #product .product-top .product-top-nav ul li:nth-child(4),
  #product .product-top .product-top-nav ul li:nth-child(7) {
    width: 38%;
  }
  #product .product-top .product-top-nav ul li:nth-child(2),
  #product .product-top .product-top-nav ul li:nth-child(5),
  #product .product-top .product-top-nav ul li:nth-child(8) {
    width: 38%;
  }
  #product .product-top .product-top-nav ul li:nth-child(3),
  #product .product-top .product-top-nav ul li:nth-child(6),
  #product .product-top .product-top-nav ul li:nth-child(9) {
    width: 24%;
  }
  /* 硬度检测仪 */
  #product .product-top .product-top-nav.op-navs10 ul li:nth-child(1),
  #product .product-top .product-top-nav.op-navs10 ul li:nth-child(4),
  #product .product-top .product-top-nav.op-navs10 ul li:nth-child(7) {
    width: 38%;
  }
  #product .product-top .product-top-nav.op-navs10 ul li:nth-child(2),
  #product .product-top .product-top-nav.op-navs10 ul li:nth-child(5),
  #product .product-top .product-top-nav.op-navs10 ul li:nth-child(8) {
    width: 38%;
  }
  #product .product-top .product-top-nav.op-navs10 ul li:nth-child(3),
  #product .product-top .product-top-nav.op-navs10 ul li:nth-child(6),
  #product .product-top .product-top-nav.op-navs10 ul li:nth-child(9) {
    width: 24%;
  }
  /* 无损检测仪 */
  #product .product-top .product-top-nav.op-navs6 ul li:nth-child(1),
  #product .product-top .product-top-nav.op-navs6 ul li:nth-child(4),
  #product .product-top .product-top-nav.op-navs6 ul li:nth-child(7) {
    width: 40%;
  }
  #product .product-top .product-top-nav.op-navs6 ul li:nth-child(2),
  #product .product-top .product-top-nav.op-navs6 ul li:nth-child(5),
  #product .product-top .product-top-nav.op-navs6 ul li:nth-child(8) {
    width: 36%;
  }
  #product .product-top .product-top-nav.op-navs6 ul li:nth-child(3),
  #product .product-top .product-top-nav.op-navs6 ul li:nth-child(6),
  #product .product-top .product-top-nav.op-navs6 ul li:nth-child(9) {
    width: 24%;
  }
  /* 厚度测量仪 */
  #product .product-top .product-top-nav.op-navs11 ul li:nth-child(1),
  #product .product-top .product-top-nav.op-navs11 ul li:nth-child(4),
  #product .product-top .product-top-nav.op-navs11 ul li:nth-child(7) {
    width: 40%;
  }
  #product .product-top .product-top-nav.op-navs11 ul li:nth-child(2),
  #product .product-top .product-top-nav.op-navs11 ul li:nth-child(5),
  #product .product-top .product-top-nav.op-navs11 ul li:nth-child(8){
    width: 40%;
  }
  #product .product-top .product-top-nav.op-navs11 ul li:nth-child(3),
  #product .product-top .product-top-nav.op-navs11 ul li:nth-child(6),
  #product .product-top .product-top-nav.op-navs11 ul li:nth-child(9){
    width: 20%;
  }
  /* 表面测量仪 */
  #product .product-top .product-top-nav.op-navs15 ul li:nth-child(1),
  #product .product-top .product-top-nav.op-navs15 ul li:nth-child(4),
  #product .product-top .product-top-nav.op-navs15 ul li:nth-child(7) {
    width: 38%;
  }
  #product .product-top .product-top-nav.op-navs15 ul li:nth-child(2),
  #product .product-top .product-top-nav.op-navs15 ul li:nth-child(5),
  #product .product-top .product-top-nav.op-navs15 ul li:nth-child(8){
    width: 38%;
  }
  #product .product-top .product-top-nav.op-navs15 ul li:nth-child(3),
  #product .product-top .product-top-nav.op-navs15 ul li:nth-child(6),
  #product .product-top .product-top-nav.op-navs15 ul li:nth-child(9){
    width: 24%;
  }

  /* 建筑工程检测 */
  #product .product-top .product-top-nav.op-navs8 ul li:nth-child(1),
  #product .product-top .product-top-nav.op-navs8 ul li:nth-child(4),
  #product .product-top .product-top-nav.op-navs8 ul li:nth-child(7) {
    width: 39%;
  }
  #product .product-top .product-top-nav.op-navs8 ul li:nth-child(2),
  #product .product-top .product-top-nav.op-navs8 ul li:nth-child(5),
  #product .product-top .product-top-nav.op-navs8 ul li:nth-child(8){
    width: 37%;
  }
  #product .product-top .product-top-nav.op-navs8 ul li:nth-child(3),
  #product .product-top .product-top-nav.op-navs8 ul li:nth-child(6),
  #product .product-top .product-top-nav.op-navs8 ul li:nth-child(9){
    width: 24%;
  }
  /* 探伤相关产品 */
  #product .product-top .product-top-nav.op-navs7 ul li:nth-child(1),
  #product .product-top .product-top-nav.op-navs7 ul li:nth-child(4),
  #product .product-top .product-top-nav.op-navs7 ul li:nth-child(7) {
    width: 40%;
  }
  #product .product-top .product-top-nav.op-navs7 ul li:nth-child(2),
  #product .product-top .product-top-nav.op-navs7 ul li:nth-child(5),
  #product .product-top .product-top-nav.op-navs7 ul li:nth-child(8){
    width: 36%;
  }
  #product .product-top .product-top-nav.op-navs7 ul li:nth-child(3),
  #product .product-top .product-top-nav.op-navs7 ul li:nth-child(6),
  #product .product-top .product-top-nav.op-navs7 ul li:nth-child(9){
    width: 24%;
  }
  /* 材料分析类 */
  #product .product-top .product-top-nav.op-navs14 ul li:nth-child(1),
  #product .product-top .product-top-nav.op-navs14 ul li:nth-child(4),
  #product .product-top .product-top-nav.op-navs14 ul li:nth-child(7) {
    width: 40%;
  }
  #product .product-top .product-top-nav.op-navs14 ul li:nth-child(2),
  #product .product-top .product-top-nav.op-navs14 ul li:nth-child(5),
  #product .product-top .product-top-nav.op-navs14 ul li:nth-child(8){
    width: 40%;
  }
  #product .product-top .product-top-nav.op-navs14 ul li:nth-child(3),
  #product .product-top .product-top-nav.op-navs14 ul li:nth-child(6),
  #product .product-top .product-top-nav.op-navs14 ul li:nth-child(9){
    width: 20%;
  }
  /* 相关检测仪 */
  #product .product-top .product-top-nav.op-navs17 ul li:nth-child(1),
  #product .product-top .product-top-nav.op-navs17 ul li:nth-child(4),
  #product .product-top .product-top-nav.op-navs17 ul li:nth-child(7) {
    width: 35%;
  }
  #product .product-top .product-top-nav.op-navs17 ul li:nth-child(2),
  #product .product-top .product-top-nav.op-navs17 ul li:nth-child(5),
  #product .product-top .product-top-nav.op-navs17 ul li:nth-child(8){
    width: 52%;
  }
  #product .product-top .product-top-nav.op-navs17 ul li:nth-child(3),
  #product .product-top .product-top-nav.op-navs17 ul li:nth-child(6),
  #product .product-top .product-top-nav.op-navs17 ul li:nth-child(9){
    width: 13%;
  }

  #product .product-nav .product-right .content-product .content-data .ul-zhankai {
    padding: .5rem 1.6rem 0;
    box-sizing: border-box;
    margin-bottom: 2.5rem;
  }
  #product .product-nav .product-right .content-product .content-data .ul-zhankai .content-list .div .product-a img {
    margin-top: .5rem;
    height: 95%;
  }
  .ul-zhankai .content-list .div {
    height: auto;
  }
  #product .product-nav .product-right .content-product .content-data .ul-zhankai .content-list .div p {
    font-size: 1.4rem;
    font-weight: normal;
    color: #333333;
    font-family: "Source Han Sans CN";
  }
  #product .product-nav .product-right .content-product .content-data .ul-zhankai .content-list .div {
    padding-bottom: 1rem;
  }










  /* 英文版 */
  #product .ser-search .h3-en {
    font-size: 1.8rem;
    line-height: 1.8rem;
    color: #333333;
    font-weight: bold;
    font-family: "Source Han Sans CN";
    text-align: center;
    padding: 0 0 1.5rem;
    margin: 0;
  }
  #product .english-product-style.product-top .product-top-nav .only-title .div-left-title .img-img_sl {
    display: none;
  }
  #product .product-top.english-product-style .product-top-nav .only-title .div-left-title .h4-title {
    padding-top: 0 !important;
  }
  #product .product-top.english-product-style .product-top-nav .only-title .div-left-title .h4-title a {
    font-size: 1.5rem;
    line-height: 1.2rem;
    color: #000000;
    font-weight: 500;
    font-family: "Source Han Sans CN";
  }
  #product .product-top.english-product-style .product-top-nav ul li {
    width: 50%;
  }
  #product .product-top.english-product-style .product-top-nav ul li:nth-child(1), 
  #product .product-top.english-product-style .product-top-nav ul li:nth-child(3), 
  #product .product-top.english-product-style .product-top-nav ul li:nth-child(5) {
    width: 50%;
  }
  #product .product-top.english-product-style .product-top-nav ul li:last-child {
    /* width: 100%; */
  }
  #product .product-top.english-product-style .product-top-nav.op-navs4 ul li {
    width: 45%;
  }
  #product .product-top.english-product-style .product-top-nav.op-navs4 ul li:nth-child(1), 
  #product .product-top.english-product-style .product-top-nav.op-navs4 ul li:nth-child(3), 
  #product .product-top.english-product-style .product-top-nav.op-navs4 ul li:nth-child(5) {
    width: 55%;
  }
  #product .product-top.english-product-style .product-top-nav.op-navs4 ul li:last-child {
    width: 100%;
  }
  /* op-navs6 */
  #product .product-top.english-product-style .product-top-nav.op-navs6 ul li {
    width: 48%;
  }
  #product .product-top.english-product-style .product-top-nav.op-navs6 ul li:nth-child(2), 
  #product .product-top.english-product-style .product-top-nav.op-navs6 ul li:nth-child(4) {
    width: 52%;
  } 
  #product .product-top.english-product-style .product-top-nav.op-navs6 ul li:nth-child(5) {
    width: 100%;
  }
  #product .product-top.english-product-style .product-top-nav.op-navs7 ul li:nth-child(2), 
  #product .product-top.english-product-style .product-top-nav.op-navs7 ul li:nth-child(5), 
  #product .product-top.english-product-style .product-top-nav.op-navs7 ul li:nth-child(8) {
    width: 50%;
  }
  #product .product-top.english-product-style .product-top-nav ul li {
    min-width: inherit;
  }
  #product .product-top.english-product-style .product-top-nav ul li a {
    color: #333333;
  }
  #product .product-top.english-product-style .product-top-nav ul li a.active{
    color: #cc2239;
  }
  .English-style-size #product .ser-search .h3-en,
  .English-style-size #product .ser-search input,
  .English-style-size #product .product-top.english-product-style .product-top-nav .only-title .div-left-title .h4-title a,
  .English-style-size #product .product-top .product-top-nav ul li a,
  .English-style-size #product .product-nav .product-right .content-product .content-data .ul-zhankai .content-list .div p,
  .English-style-size #product .product-nav .product-right .content-product .content-data .ul-zhankai .content-list .div p {
    font-family: "Helvetica";
  }
}