@media screen and (max-width: 1200px) {
  html, body {
    font-size: 10px;
    position: relative;
  }
  .overHiden {
    overflow-y: hidden;
  }
  header {
    position: fixed;
    font-size: 2.5rem;
    align-items: flex-start;
  }
  header .head_box {
    width: 100%;
    height: 5em;
    margin: 0 auto;
    background-color: none;
  }
  header .head_box .head_top {
    width: 80%;
    display: flex;
    align-items: center;
  }
  header .head_box .head_top a {
    width: 8.9em;
    height: 3em;
    padding-right: 0;
    border-right: none;
    background-size: 100%;
    margin-right: 0em;
    margin-left: 4%;
  }
  header .head_box .head_top div {
    display: none;
  }
  header .head_box .head_right {
    display: none;
  }
  header .head_box .heand_switch {
    display: flex;
    flex-direction: column;
    align-items: center;
    justify-content: center;
    width: 13.33%;
    height: 5em;
    background: #4271ee;
  }
  header .head_box .heand_switch div {
    width: 54%;
    height: .25em;
    background: #ffffff;
    border-radius: .5em;
    transition-duration: .3s;
  }
  header .head_box .heand_switch div:nth-child(2) {
    margin: .65em 0;
  }
  header .head_box .heand_switch.active div:nth-child(1) {
    -webkit-transform: translateY(0.85em) rotate(-45deg);
    -ms-transform: translateY(0.85em) rotate(-45deg);
    transform: translateY(0.85em) rotate(-45deg);
  }
  header .head_box .heand_switch.active div:nth-child(2) {
    opacity: 0;
  }
  header .head_box .heand_switch.active div:nth-child(3) {
    -webkit-transform: translateY(-0.85em) rotate(45deg);
    -ms-transform: translateY(-0.85em) rotate(45deg);
    transform: translateY(-0.85em) rotate(45deg);
    transform-origin: center;
  }
  header .head_nav {
    position: fixed;
    top: 5em;
    left: -100%;
    width: 100%;
    height: 80vh;
    background-color: rgba(255, 255, 255, 0.3);
    display: flex;
    flex-direction: column;
    align-items: flex-start;
    justify-content: flex-start;
    overflow-y: auto;
    display: none;
    z-index: 800;
  }
  header .head_nav ul {
    width: 86.66%;
    height: auto;
    flex-direction: column;
    align-items: center;
    justify-content: flex-start;
    background: #ffffff;
    padding-top: 2.9em;
    padding-bottom: 1.45em;
  }
  header .head_nav ul li {
    width: 76.9%;
    height: auto;
    margin-bottom: 1.575em;
  }
  header .head_nav ul li a {
    height: auto;
    justify-content: flex-start;
    font-size: 1.2em;
    text-align: left;
    color: #000000;
    padding-bottom: .975em;
    border-bottom: 1px solid #e6e6e6;
  }
  header .head_nav ul li:hover {
    background: none;
  }
  header .head_nav ul li.active {
    background: rgba(53, 185, 14, 0);
  }
  header .head_nav ul li.active a {
    color: #4271ee;
  }
  footer {
    width: 100%;
    font-size: 2.5rem;
  }
  footer .submissions {
    padding: 4.59em 0 4.2em 0;
  }
  footer .submissions .notice {
    width: 92%;
    margin-bottom: 3.1em;
  }
  footer .submissions .notice div {
    width: 1.51em;
    height: 1.51em;
    margin: 11.92px 2.4% 0  0;
  }
  footer .submissions .notice p {
    width: 93.18%;
    text-align: center;
  }
  footer .submissions .contact {
    width: 92%;
    flex-direction: column-reverse;
    align-items: flex-start;
    justify-content: flex-start;
  }
  footer .submissions .contact .left {
    width: 100%;
  }
  footer .submissions .contact .left .info {
    display: flex;
    align-items: center;
  }
  footer .submissions .contact .left .info .info_btn {
    width: 37.53%;
    height: 9rem;
    font-size: 1.3em;
    line-height: 1.6em;
    margin-right: 1.45em;
  }
  footer .submissions .contact .left .info .info_btn div {
    width: 1.438em;
    height: 1.438em;
  }
  footer .submissions .contact .left .info .info_phpne {
    width: auto;
    max-width: 58%;
    flex-shrink: 1;
    min-width: 0;
  }
  footer .submissions .contact .left .info .info_phpne .info_right {
    width: auto;
    min-width: 0;
  }
  footer .submissions .contact .left .info .info_phpne .info_right div {
    width: auto;
    white-space: nowrap;
    word-break: keep-all;
  }
  footer .submissions .contact .left .info .info_phpne .info_right {
    overflow: hidden;
  }
  footer .footer_box .address .addre_txt .addre_phone {
    width: auto;
    flex: 1 1 0;
    min-width: 0;
    flex-wrap: wrap;
  }
  footer .footer_box .address .addre_txt .addre_phone p,
  footer .footer_box .address .addre_txt .addre_phone i {
    width: 100%;
    word-break: break-all;
  }
  footer .submissions .contact .right {
    width: 100%;
    display: flex;
    flex-direction: column;
    justify-content: flex-start;
  }
  footer .submissions .contact .right div {
    width: 100%;
    height: 3.5em;
    margin-bottom: 1.05em;
  }
  footer .submissions .contact .right div:nth-child(3) {
    height: 9.5em;
  }
  footer .submissions .contact .right div:nth-child(3) input {
    width: 93.98%;
    height: 95%;
    line-height: 100%;
  }
  footer .submissions .contact .right div:nth-child(4) {
    width: 100%;
    margin-bottom: 4.55em;
    height: 2.75em;
  }
  footer .submissions .contact .right div input {
    width: 93.98%;
    font-size: 1em;
    line-height: 1.6em;
    outline: none;
    background-color: transparent;
    border: 0px;
  }
  footer .footer_box {
    display: flex;
    flex-direction: column;
    align-items: center;
    position: relative;
    padding-top: 2.95em;
    margin-bottom: 6.25em;
  }
  footer .footer_box .foot_title {
    width: 92%;
    padding-bottom: 1.22em;
    margin-bottom: 1.77em;
  }
  footer .footer_box .foot_title p {
    font-size: 1.3em;
    line-height: 1.5em;
    margin-bottom: 0;
  }
  footer .footer_box .drop_down {
    width: 92%;
    position: static;
    right: 0%;
    top: 0;
    flex-direction: column;
    align-items: flex-start;
    margin-bottom: 2.217em;
  }
  footer .footer_box .drop_down .drop_list {
    width: 100%;
    margin-left: 0;
    display: flex;
    flex-direction: column;
    align-items: flex-start;
    border-bottom: 1px solid #313131;
    margin-bottom: 1.42em;
  }
  footer .footer_box .drop_down .drop_list div.active::after {
    transform: rotate(90deg);
  }
  footer .footer_box .drop_down .drop_list div {
    width: 100%;
    margin-bottom: 1em;
    position: relative;
  }
  footer .footer_box .drop_down .drop_list div::after {
    content: "";
    position: absolute;
    top: 0;
    bottom: 0;
    right: 0;
    margin: auto;
    width: 9px;
    height: 12px;
    background-image: url(../images/right_img01-2.png);
    background-size: 100%;
    background-position: center;
    background-repeat: no-repeat;
    transition-duration: .2s;
  }
  footer .footer_box .drop_down .drop_list div a {
    font-size: 1em;
    line-height: 1.5em;
  }
  footer .footer_box .drop_down .drop_list ul {
    display: none;
  }
  footer .footer_box .drop_down .drop_list ul li {
    margin-bottom: 1.2em;
  }
  footer .footer_box .drop_down .drop_list ul li a {
    font-size: 1em;
    line-height: 1.5em;
  }
  footer .footer_box .address {
    width: 92%;
    margin-bottom: 2.56em;
  }
  footer .footer_box .address .addre_txt .addre_phone p {
    font-size: 1.3em;
    margin-bottom: 0;
  }
  footer .footer_box .address .addre_txt .addre_phone i {
    font-size: 2.3em;
  }
  footer .footer_box .address span {
    font-size: 1em;
    line-height: 1.5em;
    margin-bottom: 1.05em;
    max-width: 100%;
    word-break: break-word;
    overflow-wrap: anywhere;
  }
  footer .footer_box .address span a {
    word-break: break-all;
    overflow-wrap: anywhere;
  }
  footer .footer_box .address span:last-child {
    margin-bottom: 0;
  }
  footer .footer_box .tishi {
    width: 92%;
    line-height: 1.6em;
    margin-bottom: 2.35em;
  }
  footer .footer_box .technology {
    width: 100%;
    height: 2.15em;
  }
  footer .footer_box .technology ul {
    width: 92%;
  }
  footer .footer_box .technology ul li:first-child {
    margin-left: 0em;
  }
  footer .foter_nav {
    position: fixed;
    bottom: -1px;
    width: 100%;
    min-height: 7em;
    background-image: url(../images/nav_back_img01.png);
    background-size: cover;
    background-position: bottom;
    background-repeat: no-repeat;
    z-index: 9999;
    display: flex;
    flex-direction: column;
    align-items: center;
    padding-bottom: .6em;
  }
  footer .foter_nav .scroll_top {
    width: 5.25em;
    height: 5.25em;
    background: #38be86;
    border-radius: 50%;
    box-shadow: 0px 3px 20px 0px rgba(56, 190, 134, 0.2);
    background-image: url(../images/home_img02.png);
    background-size: 40.15%;
    background-position: center;
    background-repeat: no-repeat;
    margin-top: -.5em;
    margin-bottom: -1.5em;
    position: relative;
  }
  footer .foter_nav .scroll_top a {
    display: inline-block;
    width: 100%;
    height: 100%;
  }
  footer .foter_nav .quick_nav {
    width: 100%;
    display: flex;
    align-items: flex-end;
    justify-content: space-between;
    padding-bottom: .6em;
  }
  footer .foter_nav .quick_nav .quick_inner a {
    display: flex;
    flex-direction: column;
    align-items: center;
    justify-content: flex-end;
  }
  footer .foter_nav .quick_nav .quick_inner a div {
    margin-bottom: .11em;
    min-width: .9em;
    max-width: 1.31em;
  }
  footer .foter_nav .quick_nav .quick_inner a div img {
    width: 100%;
  }
  footer .foter_nav .quick_nav .quick_inner a p {
    opacity: 0.93;
    font-size: .9em;
    font-family: Source Han Sans SC, Source Han Sans SC-Normal;
    font-weight: normal;
    text-align: center;
    color: #7a7b76;
    line-height: 1.5em;
    letter-spacing: 1.8px;
  }
  footer .foter_nav .quick_nav .quick_inner a.active p {
    color: #38be86;
  }
  footer .foter_nav .quick_nav .quick_inner:nth-child(1) a:nth-child(1).active div img {
    content: url("../images/common/nav_btn01-2.png");
  }
  footer .foter_nav .quick_nav .quick_inner:nth-child(1) a:nth-child(2).active div img {
    content: url("../images/common/nav_btn02-2.png");
  }
  footer .foter_nav .quick_nav .quick_inner:nth-child(2) a:nth-child(1).active div img {
    content: url("../images/common/nav_btn03-3.png");
  }
  footer .foter_nav .quick_nav .quick_inner:nth-child(2) a:nth-child(2).active div img {
    content: url("../images/common/nav_btn04-4.png");
  }

  /* ===== 第 75 轮：移动端拨号入口 =====
     背景：桌面端 5 处 tel: 入口在移动端全部失效 ——
       · header .head_right / .side_nav 被 display:none
       · 页脚地址区 2 个 tel 链接带 .wow 动画，未滚动到位时 visibility:hidden
     实测 390px 下「可见且可点的 tel 链接 = 0 处」，手机用户根本拨不了号。
     做法：底栏由「两组各 2 项」改为 5 项等分，末尾新增「拨打电话」。
     为什么不替换现有项：实测移动端页脚整块（含「联系我们」列）是 display:none，
       底栏那 4 项是移动端唯一的导航入口，替换任何一项都会造成入口丢失。
     375px 下 4 项文字总宽仅 151px，加第 5 项余量充足。 */
  footer .foter_nav .quick_nav {
    justify-content: space-around;
    align-items: flex-end;
  }
  /* 第 1 组 2 项、第 2 组 2 项、拨号 1 项，按 2:2:1.4 分配，视觉上近似等分。
     保留 .quick_inner 结构不动 —— 下面 4 条 nth-child 的 active 图标切换规则依赖它。 */
  footer .foter_nav .quick_nav .quick_inner {
    flex: 0 0 40%;
    display: flex;
    align-items: flex-end;
    justify-content: space-evenly;
  }
  footer .foter_nav .quick_nav > a.bar_tel {
    flex: 0 0 20%;
    display: flex;
    flex-direction: column;
    align-items: center;
    justify-content: flex-end;
  }
  footer .foter_nav .quick_nav a p {
    opacity: 0.93;
    font-size: .9em;
    font-family: Source Han Sans SC, Source Han Sans SC-Normal;
    font-weight: normal;
    text-align: center;
    color: #7a7b76;
    line-height: 1.5em;
    letter-spacing: 1.2px;
    white-space: nowrap;
  }
  footer .foter_nav .quick_nav a div {
    margin-bottom: .11em;
    min-width: .9em;
    max-width: 1.31em;
  }
  /* 拨号按钮：图标用主色 + 白色话筒，与其它灰色导航项区分，突出这是动作 */
  footer .foter_nav .quick_nav a.bar_tel .bar_tel_ico {
    width: 1.31em;
    height: 1.31em;
    background-color: #38be86;
    background-image: url("data:image/svg+xml;charset=utf-8,%3Csvg xmlns='http://www.w3.org/2000/svg' viewBox='0 0 24 24' fill='%23ffffff'%3E%3Cpath d='M6.62 10.79a15.05 15.05 0 006.59 6.59l2.2-2.2a1 1 0 011.02-.24 11.36 11.36 0 003.57.57 1 1 0 011 1V20a1 1 0 01-1 1A17 17 0 013 4a1 1 0 011-1h3.5a1 1 0 011 1 11.36 11.36 0 00.57 3.57 1 1 0 01-.25 1.02l-2.2 2.2z'/%3E%3C/svg%3E");
    background-size: 62%;
    background-position: center;
    background-repeat: no-repeat;
    border-radius: .28em;
    margin-bottom: .11em;
  }
  footer .foter_nav .quick_nav a.bar_tel p {
    color: #38be86;
  }
  /* 文字用主色，与其它三项的灰色区分，提示这是动作而非导航 */
  footer .foter_nav .quick_nav .quick_inner a.bar_tel p {
    color: #38be86;
  }
  .side_nav {
    display: none;
  }
}

@media screen and (max-width: 1115px) {
  html, body {
    font-size: 12px;
  }
}

@media screen and (max-width: 1104px) {
  html, body {
    font-size: 11.5px;
  }
}

@media screen and (max-width: 1056px) {
  html, body {
    font-size: 11px;
  }
}

@media screen and (max-width: 1008px) {
  html, body {
    font-size: 10.5px;
  }
}

@media screen and (max-width: 960px) {
  html, body {
    font-size: 10px;
  }
}

@media screen and (max-width: 912px) {
  html, body {
    font-size: 9.5px;
  }
}

@media screen and (max-width: 864px) {
  html, body {
    font-size: 9px;
  }
}

@media screen and (max-width: 816px) {
  html, body {
    font-size: 8.5px;
  }
}

@media screen and (max-width: 768px) {
  html, body {
    font-size: 8px;
  }
}

@media screen and (max-width: 720px) {
  html, body {
    font-size: 7.5px;
  }
}

@media screen and (max-width: 672px) {
  html, body {
    font-size: 7px;
  }
}

@media screen and (max-width: 624px) {
  html, body {
    font-size: 6.5px;
  }
}

@media screen and (max-width: 576px) {
  html, body {
    font-size: 6px;
  }
}

@media screen and (max-width: 528px) {
  html, body {
    font-size: 5.5px;
  }
}

@media screen and (max-width: 480px) {
  html, body {
    font-size: 5px;
  }
}

@media screen and (max-width: 432px) {
  html, body {
    font-size: 4.5px;
  }
}

@media screen and (max-width: 384px) {
  html, body {
    font-size: 4px;
  }
}

@media screen and (max-width: 336px) {
  html, body {
    font-size: 3.5px;
  }
}

@media screen and (max-width: 288px) {
  html, body {
    font-size: 3px;
  }
}