@media screen and (min-width: 912px) {
  .back_top {
    background: url(../img/back-top.png) no-repeat;
    position: fixed;
    height: 0.8rem;
    width: 0.8rem;
    right: 1rem;
    bottom: 1rem;
    background-size: 100% 100%;
    cursor: pointer;
    display: none;
  }
  body {
    background: #ffffff;
  }
  .mobile_power_bck,
  .mobile_down,.mobile_contact {
    display: none;
  }
  .case_img {
    display: flex;
    justify-content: space-between;
    align-items: center;
  }
  .nav {
    padding: 0.3rem 10%;
    position: fixed;
    background-color: #fff;
    width: 80%;
    margin: 0 auto;
    z-index: 5;
  }
  .logo {
    width: 2.2rem;
    background: url(../img/logo.png) no-repeat;
    background-size: 100% 100%;
    height: 0.4rem;
  }
  .nav_list {
    font-size: 0.22rem;
    font-weight: 500;
    width: 60%;
  }
  .bottom_line {
    width: 100%;
    height: 0.04rem;
    background-color: #d70c19;
    display: none;
  }
  .show {
    display: block;
  }
  ul li:hover .bottom_line {
    display: block;
  }
  .nav_list a {
    color: rgba(51, 51, 51, 1);
    font-family: PingFangSC-Medium, PingFang SC;
  }
  .sign-list {
    font-size: 0.18rem;
    width: 1rem;
    position: relative;
    cursor: pointer;
  }
  .btn_width {
    width: 0.8rem;
    margin: 0 auto;
  }
  .list-unstyled {
    position: absolute;
    background-color: #f8f8f8;
    box-shadow: 0rem 0.02rem 0.2rem 0rem rgb(0 0 0 / 5%);
    width: 1rem;
    text-align: center;
    margin-top: 0.2rem;
    border-radius: 0.05rem;
    display: none;
  }
  .list-unstyled li {
    padding: 0.1rem;
    color: #282d33;
  }
  .list-unstyled a {
    color: #282d33;
  }
  .top_bck {
    background: url("../img/bg.png") no-repeat;
    background-size: 100% 100%;
    width: 100%;
    height: 50vw;
    position: relative;
  }
  .top_bck p {
    width: 40%;
    translate: 0% 18vw;
    margin-left: 10%;
    font-size: 0.48rem;
    font-family: PingFangSC-Semibold, PingFang SC;
    font-weight: 600;
    color: #ffffff;
    line-height: 0.9rem;
    text-align: justify;
  }
  .bck_line {
    width: 1.8rem;
    height: 0.1rem;
    background-color: #d70c19;
    translate: 0% 22vw;
    margin-left: 10%;
  }
  .two_bck {
    width: 80%;
    margin: 0 auto;
    padding: 1rem 0rem;
    display: flex;
    justify-content: space-between;
  }
  .change-power {
    background: url("../img/change-power.png") no-repeat;
    background-size: 100% 100%;
    width: 45%;
    height: 48vw;
    padding: 0.6rem 0.2rem;
  }
  .car-background {
    background: url("../img/car-background.png") no-repeat;
    background-size: 100% 100%;
    width: 45%;
    height: 48vw;
    padding: 0.6rem 0.2rem;
  }
  .bck_top_word {
    text-align: center;
    font-size: 0.42rem;
    color: #ffffff;
    font-family: PingFangSC-Medium, PingFang SC;
    font-weight: 500;
    line-height: 0.7rem;
  }
  .bck_bottom_word,
  .en_bck_bottom_word,
  .ch_bck_bottom_word {
    text-align: center;
    width: 94%;
    margin: 0.3rem auto;
    font-size: 0.2rem;
    color: #ffffff;
    font-family: PingFangSC-Medium, PingFang SC;
    font-weight: 500;
    line-height: 0.4rem;
  }
  #about_us {
    padding-top: 1rem;
    padding-bottom: 1rem;
    background: #f9f9f9;
  }
  .title {
    text-align: center;
    font-size: 0.48rem;
    font-family: PingFangSC-Medium, PingFang SC;
    font-weight: 500;
    color: #000000;
    line-height: 0.7rem;
  }
  .about_img {
    width: 80%;
    margin: 1rem auto 0.35rem;
    display: flex;
    justify-content: space-between;
  }
  .about_bck {
    width: 45%;
    height: 28vw;
  }
  .green_car {
    background: url(../img/green-car.png) no-repeat;
    background-size: 100% 100%;
  }
  .power_station {
    background: url(../img/power-station.png) no-repeat;
    background-size: 100% 100%;
  }
  .about_title {
    margin-top: 1.4rem;
    font-size: 0.36rem;
    font-family: PingFangSC-Medium, PingFang SC;
    font-weight: 500;
    color: #ffffff;
    line-height: 0.5rem;
    text-align: center;
  }
  .power_bck {
    padding: 1rem 10%;
  }
  .power_info {
    width: 32vw;
  }
  .power_title {
    font-size: 0.48rem;
    font-family: PingFangSC-Medium, PingFang SC;
    font-weight: 500;
    color: #000000;
    line-height: 0.7rem;
  }
  .mainer_long {
    margin-top: 0.4rem;
    text-align: center;
    width: 80%;
    font-size: 0.24rem;
    font-family: PingFangSC-Medium, PingFang SC;
    font-weight: 500;
    color: #282d33;
    line-height: 0.5rem;
  }
  .outline_box img {
    width: 32vw;
  }
  .word_left {
    text-align: justify;
    width: 100%;
  }
  .join_us {
    padding: 1rem 0rem 0rem;
  }
  .map {
    width: 70vw;
    height: 40vw;
    margin: 1rem auto 0rem;
    background: url(../img/map.png) no-repeat;
    background-size: 100% 100%;
    color: #d70c19;
    position: relative;
  }
  .map span:first-child {
    font-size: 0.28rem;
    position: absolute;
    top: 52.4%;
    left: 83%;
  }
  .map span:last-child {
    font-size: 0.2rem;
    position: absolute;
    top: 53.2%;
    left: 87.5%;
  }
  .pc_contact_us {
    width: 80%;
    margin: 0 auto;
  }
  .en_contact_address{
    margin-left: 10%;
    line-height: 0.3rem;
    margin-bottom: 0.3rem;
  }
  .contact_word, .contactAddressWord{
    font-size: 0.24rem;
    font-family: PingFangSC-Medium, PingFang SC;
    font-weight: 500;
    color: #282d33;
    vertical-align: middle;
  }
  .contact_icon {
    width: 0.35rem;
    margin-right: 0.1rem;
    vertical-align: middle;
  }
  footer {
    background-color: rgba(0, 0, 0, 1);
    color: #ffffff;
    line-height: 0.24rem;
    font-size: 0.18rem;
    font-family: PingFangSC-Regular, PingFang SC;
    padding: 0.3rem 0;
    display: flex;
    justify-content: center;
    align-items: center;
  }
  footer a {
    color: #ffffff;
    font-family: PingFangSC-Regular, PingFang SC;
    margin-left: 0.2rem;
    cursor: pointer;
  }
  .police_link{
    display: flex;
    justify-content: center;
    align-items: center;
  }
}
@media screen and (max-width: 912px) {
  .back_top {
    background: url(../img/back-top.png) no-repeat;
    position: fixed;
    height: 0.8rem;
    width: 0.8rem;
    right: 0.8rem;
    bottom: 1rem;
    background-size: 100% 100%;
    display: none;
  }
  .nav_list,
  .power_bck,
  .down,.pc_contact{
    display: none;
  }
  body {
    background-color: #ffffff;
    width: 100%;
  }
  header {
    width: 100%;
  }
  .nav {
    position: absolute;
    top: 0px;
    left: 4%;
    width: 92%;
    height: 1.4rem;
  }
  .logo {
    background: url(../img/mobile-logo.png) no-repeat;
    background-size: 100%;
    height: 0.8rem;
    width: 4rem;
  }
  .sign-list {
    font-size: 0.18rem;
    width: 1rem;
    position: relative;
  }
  .btn_width {
    width: 0.8rem;
    margin: 0 auto;
    font-size: 0.24rem;
    font-family: PingFangSC-Medium, PingFang SC;
    font-weight: 500;
    color: #ffffff;
    line-height: 0.34rem;
  }
  .list-unstyled {
    position: absolute;
    background-color: #f8f8f8;
    box-shadow: 0rem 0.02rem 0.2rem 0rem rgb(0 0 0 / 5%);
    width: 1rem;
    text-align: center;
    margin-top: 0.2rem;
    border-radius: 0.05rem;
    display: none;
  }
  .list-unstyled li {
    padding: 0.1rem;
  }
  .list-unstyled a {
    color: #282d33;
  }
  .mobile_down {
    width: 0.2rem;
  }
  .top_bck {
    background: url(../img/mobile-bg.png) no-repeat;
    background-size: 100% 100%;
    width: 100%;
    height: 4.3rem;
    padding-top: 2.2rem;
  }
  .top_bck p {
    font-size: 0.36rem;
    font-family: PingFangSC-Semibold, PingFang SC;
    font-weight: 600;
    color: #ffffff;
    line-height: 0.6rem;
    width: 74%;
    margin-left: 8%;
    text-align: justify;
  }
  .bck_line {
    width: 1.8rem;
    height: 0.08rem;
    background-color: #d70c19;
    margin-left: 8%;
    margin-top: 0.5rem;
  }
  .change-power {
    width: 92%;
    margin: 0.4rem auto;
    height: 10rem;
    background: url(../img/mobile-change-power.png);
    background-size: 100% 100%;
    padding-top: 1rem;
  }
  .bck_top_word {
    font-size: 0.48rem;
    font-family: PingFangSC-Medium, PingFang SC;
    font-weight: 500;
    color: #ffffff;
    line-height: 0.7rem;
    text-align: center;
  }
  .bck_bottom_word,
  .en_bck_bottom_word,
  .ch_bck_bottom_word {
    font-size: 0.2rem;
    font-family: PingFangSC-Regular, PingFang SC;
    font-weight: 400;
    color: #ffffff;
    line-height: 0.4rem;
    width: 90%;
    margin: 0.3rem auto 0rem;
    text-align: center;
  }
  .car-background {
    width: 92%;
    margin: 0.4rem auto;
    height: 10rem;
    background: url(../img/mobile-car-background.png);
    background-size: 100% 100%;
    padding-top: 1rem;
  }
  .title {
    text-align: center;
    font-size: 0.48rem;
    font-family: PingFangSC-Medium, PingFang SC;
    font-weight: 500;
    color: #000000;
    line-height: 0.7rem;
    margin-top: 0.6rem;
  }
  .mainer_long {
    width: 92%;
    margin: 0.5rem auto;
    font-size: 0.24rem;
    font-family: PingFangSC-Medium, PingFang SC;
    font-weight: 500;
    color: #282d33;
    line-height: 0.5rem;
    text-align: center;
  }
  .about_bck {
    width: 92%;
    height: 4rem;
    padding-top: 1.4rem;
  }
  .green_car {
    background: url(../img/mobile-green-car.png) no-repeat;
    background-size: 100% 100%;
  }
  .power_station {
    background: url(../img/mobile-power-station.png) no-repeat;
    background-size: 100% 100%;
    margin-top: 0.1rem;
  }
  .about_title {
    font-size: 0.36rem;
    font-family: PingFangSC-Medium, PingFang SC;
    font-weight: 500;
    color: #ffffff;
    line-height: 0.5rem;
    text-align: center;
  }
  .case {
    font-size: 0.48rem;
    font-family: PingFangSC-Medium, PingFang SC;
    font-weight: 500;
    color: #000000;
    line-height: 0.7rem;
    margin-top: 0.6rem;
    text-align: center;
  }
  .mobile_sun_board {
    width: 100%;
  }
  .back_box {
    width: 92%;
    margin: 0.6rem auto;
    background-color: #f9f9f9;
    padding-bottom: 0.2rem;
  }
  .power_title {
    font-size: 0.36rem;
    font-family: PingFangSC-Medium, PingFang SC;
    font-weight: 500;
    color: #000000;
    margin-left: 0.2rem;
    margin-top: 0.4rem;
    margin-right: 0.2rem;
  }
  .word_left {
    text-align: justify;
    margin-left: 0.2rem;
    margin-top: 0.4rem;
    margin-right: 0.2rem;
  }
  .map {
    width: 92vw;
    height: 50vw;
    margin: 1rem auto 0rem;
    background: url(../img/moblie-map.png) no-repeat;
    color: #d70c19;
    background-size: 100% 100%;
    position: relative;
  }
  .map span:first-child {
    font-size: 0.28rem;
    position: absolute;
    top: 50%;
    left: 81.5%;
    transform: scale(0.8);
  }
  .map span:last-child {
    font-size: 0.24rem;
    position: absolute;
    top: 51%;
    left: 85.6%;
    transform: scale(0.7);
  }
  .mobile_contact_us {
    width: 92%;
    margin: 0 auto;
    line-height: 0.3rem;
  }
  .contact_word,.contactAddressWord {
    font-size: 0.24rem;
    font-family: PingFangSC-Medium, PingFang SC;
    font-weight: 500;
    color: #282d33;
    vertical-align: middle;
  }
  .contact_icon {
    width: 0.35rem;
    margin-right: 0.1rem;
    vertical-align: middle;
  }
  footer {
    background-color: rgba(0, 0, 0, 1);
    line-height: 0.25rem;
    color: #ffffff;
    font-size: 0.18rem;
    font-family: PingFangSC-Regular, PingFang SC;
    padding: 0.24rem 0;
    text-align: center;
  }
  .police_link{
    display: flex;
    justify-content:center;
    align-items: center;
    
  }
  footer a {
    color: #ffffff;
    font-family: PingFangSC-Regular, PingFang SC;
    margin-top: 0.1rem;
    line-height: 0.25rem;
    display: block;
    margin-left: 10px;
  }
  .footerWord{
    line-height: 20px;
  }
  .contact_address{
    margin-left: 4%;
    margin-top: 0.2rem;
    line-height: 0.3rem;
    margin-bottom: 0.3rem;
    display: flex;
    align-items: flex-start;
  }
  .contactAddressWord{
    text-align: justify;
    margin-right: 4%;
  }
}