.head {
  width: 100%;
  height: 100%;
  background: url("../images/estate-topic.jpg");
  background-position: center;
  background-size: cover;
  background-repeat: no-repeat;
}
.performance {
  background: url("../images/performance.jpg");
}
.stable {
  background: url("../images/stable-bg.jpg");
}
.community {
  background: url("../images/community-bg.jpg");
}
.ecology {
  background: url("../images/ecology-bg.jpg");
}
.tool {
  background: url("../images/tool-bg.jpg");
}
.success_demo{
  background-image: url('../images/success_bg_black.jpg');
  background-position: center;
  background-size: cover;
  background-repeat: no-repeat;
}
.partner {
  background: #2A2A2A;
}
.performance, .stable, .community, .ecology, .tool, .partner {
  width: 100%;
  height: 708px;
  position: relative;
  background-repeat: no-repeat;
  background-size: cover;
  background-position: center;
  color: #fff;
}
.performance div, .community div, .ecology div, .tool div, .partner div {
  width: 600px;
  position: absolute;
  top: 50%;
  left: 50%;
  transform: translate(-50%, -50%);
  text-align: center;
}
@media screen and (min-width: 769px) {
  .nav {
    background: #982325;
  }
  .nav-list a {
      color: #fff;
      margin-bottom: 15px;
  }

  .nav a {
    color: #fff;
  }
  .nav-list a {
    float: right;
    display: block;
    margin-right: 32px;
    padding: 0px 4px 2px;
    font-size: 16px;
    line-height: 28px;
    font-weight: 300;
  }
  .nav-list a:nth-child(4) {
    border-bottom: 1px solid #9B9B9B;
  }
  .head > div {
    width: 750px;
    position: absolute;
    top: 50%;
    left: 50%;
    transform: translate(-50%, -50%);
    color: #fff;
    text-align: center;
  }
  h1 {
    font-size: 48px;
    line-height: 60px;
    font-weight: 600;
  }
  .head > div p {
    margin-top: 51px;
    font-size: 16px;
    line-height: 32px;
    font-weight: 500;
  }
  .case-wrap {
    width: 100%;
    height: 900px;
    background: #000;
  }
  .m-case-wrap {
    display: none;
  }
  .case {
    width: 1150px;
    position: relative;
    margin: 0 auto;
    overflow: hidden;
  }
  .case-detail, .case-menu {
    width: 540px;
    height: 707px;
    margin-top: 97px;
    background: #171717;
  }
  .case-detail {
    position: relative;
    float: left;
    color: #696969;
    display: none;
  }
  .case-detail:first-child {
    display: block;
  }
  .case-detail div {
    width: 422px;
    margin: 40px auto;
  }
  .case-detail div img {
    width: 100%;
  }
  .case-detail p {
    width: 422px;
    margin: 0 auto;
    font-size: 16px;
    line-height: 32px;
  }
  .case-detail p:first-child {
    width: 422px;
    line-height: 95px;
    border-bottom: 1px solid #000;
    color: #fff;
  }
  .case-detail p:nth-child(3) {
    margin-bottom: 10px;
    color: #fff;
  }
  .case-detail p:last-child {
    position: absolute;
    bottom: 40px;
    left: 50%;
    transform: translateX(-50%);
    text-align: right;
  }

  .case-menu {
    width: 542px;
    float: right;
  }
  .case-menu-icon-wrap {
    height: 543px;
    overflow: hidden;
  }
  .case-menu-icon > div {
    width: 180px;
    height: 180px;
    position: relative;
    cursor: pointer;
    float: left;
    margin: 0;
    border: none;
    border-bottom: 1px solid #000;
  }
  .case-menu img {
    width: 50%;
    display: block;
    position: absolute;
    top: 50%;
    left: 50%;
    transform: translate(-50%, -50%);
  }
  .icon-large img {
    width: 70%;
  }
  .icon-small img {
    width: 40%;
  }
  .case-menu-icon > div:nth-child(3n+1), .case-menu-icon > div:nth-child(3n+2) {
    border-right: 1px solid #000;
  }
  .icon {
    background: #171717;
  }
  .more-top-wrap, .more-bottom-wrap {
    width: 100%;
    height: calc(100% - 3px - 180px * 3);
    cursor: pointer;
    position: relative;
  }
  .more-bottom, .more-top {
    position: absolute;
    top: 50%;
    left: 50%;
    transform: translate(-50%, -50%);
  }
  .more-bottom p, .more-top p {
    font-family: down2-icon;
    color: #888888;
    font-size: 20px;
    text-align: center;
    line-height: 14px;
    user-select: none;
  }
  .more-top-wrap {
    display: none;
  }
  .icon:first-child {
    background: #292929;
  }
  .more-top p {
    transform:rotate(180deg);
    -ms-transform:rotate(180deg); 	/* IE 9 */
    -moz-transform:rotate(180deg); 	/* Firefox */
    -webkit-transform:rotate(180deg); /* Safari 和 Chrome */
    -o-transform:rotate(180deg); 	/* Opera */
  }
  .more-bottom p:last-child, .more-top p:last-child {
    line-height: 0px;
  }

  .standard-wrap {
    width: 100%;
    height: 900px;
    position: relative;
    background: #303030;
  }
  .standard {
    width: 1310px;
    height: 750px;
    position: absolute;
    top: 50%;
    left: 50%;
    transform: translate(-50%, -50%);
    overflow: hidden;
  }
  .standard-left {
    width: 570px;
    float: left;
    position: absolute;
    top: 50%;
    left: 0;
    transform: translateY(-50%);
    color: #fff;
  }
  .standard-left h1 {
    font-size: 48px;
    line-height: 60px;
  }
  .standard-left > p {
    margin-top: 50px;
    font-size: 16px;
    line-height: 32px;
  }
  .standard-left > div {
    margin-top: 80px;
  }
  .standard-left div p {
    display: block;
    font-size: 16px;
    line-height: 32px;
    padding: 0 23px;
  }
  .standard-left > div > div > p:first-child {
    padding-top: 18px;
    font-size: 20px;
  }
  .standard-left > div > div > p:last-child {
    display: none;
  }
  .standard-left > div > div:hover {
    background: #F4BA00;
  }
  .standard-left > div > div:hover > p:last-child {
    display: block;
  }
  .standard-left > div > div {
    height: 116px;
    background: #2C2C2C;
    border-bottom: 1px solid #303030;
  }
  .standard-right {
    float: right;
    width: 684px;
    height: 100%;
    position: relative;
  }
  #accommodate p:last-child {
    display: block;
  }
  #accommodate {
    background: #F4BA00;
  }
  .standard-right img {
    width: 100%;
    position: absolute;
    top: 50%;
    left: 0;
    transform: translateY(-50%);
  }
  #change-img {
    display: none;
  }
  .standard-mobile-wrap {
    display: none;
  }

  .community {
    height: 692px;
  }

  .stable h1 {
     text-align: center;
  }
  .stable > div {
    position: absolute;
    top: 50%;
    left: 50%;
    transform: translate(-50%, -50%);
    text-align: center;
  }
  .stable > div > div {
    width: 1150px;
    margin: 90px auto 0;
    overflow: hidden;
  }
  .stable > div > div > div {
    width: 225px;
    margin-left: calc((100% - 225px * 4) / 3);
    float: left;
  }
  .stable > div > div > div:first-child {
    margin-left: 0;
  }
  .community div p, .ecology div p, .tool div p, .performance div p, .stable div p {
    margin-top: 52px;
    font-size: 16px;
    line-height: 32px;
    font-weight: 500;
  }

  .performance div {
    top: 110px;
    transform: translateX(-50%);
  }
  .performance div p {
    margin-top: 25px;
  }
  .partner div  {
    width: auto;
  }
  .partner img {
    width: 95%;
    margin-top: 30px;
  }
  /* 成功案例 */
  .success_demo{
    height: 1000px;
    position: relative;
    overflow: hidden;
  }
  .success_demo .slider_nav{
    z-index:99;
    position: absolute;
    right: 0;
    bottom:8%;
    height: 8%;
    width: 60%;
    display: flex;
    justify-content:space-around;
    background-color: #1a1a1a;
  }
  .slider_nav span{
    content: '';
    width: 25%;
    height: 3px;
    position: absolute;
    bottom:0;
    left:0;
    background-color: #efefef;
  }
  .success_demo .slider_nav div{
    flex: 1;
    display: flex;
    align-items: center;
  }
  .success_demo .slider_nav p{
    flex: 1;
    text-align: center;
    color: #888;
  }
  .success_demo .slider_nav div:hover{
    cursor:pointer;
  }
  .success_demo .slider_nav p.active{
    color: #efefef;
  }
  .success_demo .slider_text{
    height: 100%;
    box-sizing: border-box;
    position: absolute;
    top:0;
    color:#efefef;
    
  }
  .success_demo .slider_text .slider_text_block{
    height: 100%;
    position: absolute;
    top: 0;
    left:1500px;
  }
  .success_demo .slider_text .slider_text_block h1{
    font-size: 50px;
    line-height: 1;
    margin-bottom:200px;
    font-weight: bolder;
  }
  .success_demo .slider_text .slider_text_block h3{
    font-size:16px;
    font-weight: bold;
    line-height: 3.5;
  }
  .success_demo .slider_text .slider_text_block p{
    font-size:14px;
    line-height: 2.5;
  }
  .success_demo .slider_img{
    height: 100%;
    position: absolute;
    top:0%;
    left:0;
  }
  .success_demo .slider_img .slider_image{
    position: absolute;
    top:0;
    left: -3000px;
  }
  .success_demo .slider_img .slider_image.active{
    transform: translateX(1000) 3s;
  }

  .my_flex_center{
    display:flex;flex-direction: column;justify-content:center;
  }
  .slider_text_block_top200{
    margin-top:200px;
  }
  .slider_text_block_top{
    margin-top:100%;
  }


}
@media screen and (min-width: 769px) and (max-width: 1420px) {
  .standard {
    width: calc((1310 / 1420) * 100%);
  }
  .standard-left {
    width: calc((570 / 1310) * 100%);
  }
  .standard-left {

  }
  .standard-right {
    width: calc((684 / 1310) * 100%);
  }
  .standard-right img {
    width: 100%;
  }
  .success_demo .slider_text .slider_text_block h1{
    font-size: 40px;
    margin-bottom:100px;
  }
}
@media screen and (min-width: 769px) and (max-width: 1350px) {
  .standard-left h1 {
    font-size: 40px;
  }

  .success_demo .slider_text{
    width: 30%;
  }
  .success_demo .slider_text .slider_text_block{
    height: 100%;
    position: absolute;
    top: 0;
    left:1500px;
  }
  .success_demo .slider_text .slider_text_block h1{
    font-size: 40px;
    line-height: 1;
    margin-bottom:80px;
    font-weight: bolder;
  }
  .success_demo .slider_text .slider_text_block h3{
    font-size:14px;
    font-weight: bold;
    line-height: 3;
  }
  .success_demo .slider_text .slider_text_block p{
    font-size:12px;
    line-height: 2;
  }
        /* 成功案例 */
        .slider_text_block_top{
          margin-top:300px;
        }
        .slider_text_block_top200{
          margin-top:150px;
        }
}
@media screen and (min-width: 769px) and (max-width: 1100px) {
  .standard-left h1 {
    font-size: 30px;
    line-height: 40px;
  }
  .standard-left > p {
    font-size: 14px;
    line-height: 28px;
  }
  .standard-left > div > div > p:first-child {
    font-size: 16px;
    line-height: 30px;
    padding-top: 10px;
  }
  .standard-left > div > div > p:last-child {
    font-size: 14px;
    line-height: 25px;
  }
  .standard-left > div > div {
    height: 100px;
  }

      /* 成功案例 */
  .slider_text_block_top{
    margin-top:150px;
  }
  .slider_text_block_top200{
    margin-top:80px;
  }
  .success_demo .slider_text .slider_text_block h1{
    font-size: 30px;
    margin-bottom: 30px;
  }

  
}
@media screen and (min-width: 769px) and (max-width: 1300px) {

  .head > div {
    width: 500px;
  }
  .case {
    width: calc((1150 / 1300) * 100%);
  }
  .case-detail {
    width: calc((540 / 1150) * 100%);
  }
  .case-detail div {
    width: calc((422 / 540) * 100%);
  }
  .case-detail p,.case-detail p:first-child {
    width: calc((422 / 540) * 100%);
  }
  .case-menu {
    width: calc((542 / 1150) * 100%);
  }
  .case-menu-icon-wrap .icon {
    width: calc((100% - 2px) / 3);
  }
  .stable > div {
    width: calc((1150 / 1300) * 100%);
  }
  .stable > div > div {
    width: 100%;
    margin: 90px auto 0;
    overflow: hidden;
  }
  .stable > div > div > div {
    width: calc(225 / 1150 * 100%);
    margin-left: calc((100% - calc(225 / 1150 * 100%) * 4) / 3);
    float: left;
  }
  .stable > div > div >div >img {
    width: calc(188 / 225 * 100%);
  }
  .stable > div > div > div:first-child {
    margin-left: 0;
  }
}
@media screen and (min-width: 769px) and (max-width: 920px) {
  .partner div {
    width: calc((763 / 920) * 100%);
  }
  .partner div img {
    width: 95%;
  }
  /* 成功案例 */
  .slider_text_block_top{
    margin-top:80px !important;
  }
  .slider_text_block_top200{
    margin-top:80px !important;
  }
}
@media screen and (max-width: 769px) {
  h1 {
    font-size: 24px;
    line-height: 2;
  }
  p {
    font-size: 12px;
    line-height: 2;
  }
  .head > div {
    width: 8rem;
    position: absolute;
    top: 50%;
    left: 50%;
    transform: translate(-50%, -50%);
    text-align: center;
    color: #fff;
  }
  .head > div p {
    margin-top: 0.5rem;
  }
  .case-wrap {
    display: none;
  }
  .m-case {
    background: #000;
    color: #fff;
  }
  .m-case-detail {
    padding: 0.6rem 0 1.51rem;
    margin: 0 auto;
    display: none;
  }
  .m-case-detail:first-child {
    display: block;
  }
  .m-case-detail > p, .m-case-detail > div {
    width: 7.1rem;
    margin: 0 auto;
  }
  .m-case-detail > p {
    margin-top: 0.3rem;
  }
  .m-case-detail > p:first-child {
    text-align: center;
    margin-bottom: 0.72rem;
  }
  .m-case-detail > p:last-child {
    text-align: right;
    color: #696969;
  }
  .m-case-detail > p:nth-last-child(2) {
    color: #696969;
  }
  .m-case-detail img {
    width: 100%;
  }
  .m-case-menu > div:first-child {
    display: flex;
    flex-wrap: wrap;
  }
  .m-icon {
    width: calc((100% - 4px) / 3);
    height: 2.2rem;
    position: relative;
    float: left;
    overflow: hidden;
    display: flex;
    border-right: 2px solid #000;
    border-bottom: 2px solid #000;
    background: #171717;
  }
  .bg0 {
    background: #000;
  }
  .m-icon:nth-child(4),.m-icon:nth-child(8),.m-icon:nth-child(12),.m-icon:nth-child(16),.m-icon:nth-child(20),.m-icon:nth-child(24),.m-icon:nth-child(28),.m-icon:nth-child(32) {
    border-right: none;
  }
  .m-case-menu .m-icon img {
    width: 50%;
    position: absolute;
    top: 50%;
    left: 50%;
    transform: translate(-50%, -50%);
  }
  .standard-wrap {
    background: #000;
    color: #fff;
  }
  .standard-left {
    width: 8rem;
    height: auto;
    margin: 0 auto;
    text-align: center;
  }
  .standard-left h1 {
    padding-top: 1.4rem;
  }
  .standard-left > p {
    margin-top: 0.74rem;
  }
  #standard, .standard-right {
    display: none;
  }
  .standard-mobile-wrap {
    width: 8rem;
    overflow: hidden;
  }
  .standard-mobile {
    width: 32rem;
    margin-top: 1.5rem;
    overflow: hidden;
    transform: translateX(0rem);
  }
  .standard-mobile > div {
    width: 8rem;
    float: left;
  }
  .standard-mobile > div p {
    width: 5.5rem;
    margin: 0 auto 0.3rem;
  }
  .standard-mobile > div > div:first-child {
    height: 3rem;
    padding: 0.3rem 0;
    background: #191919;
  }
  .standard-mobile > div > div:first-child > p:first-child {
    font-size: 24px;
  }

  .m-standard-img {
    margin-top: 1rem;
  }
  .standard-mobile > div > div img {
    width: 100%;
  }
  .circle {
    width: 2rem;
    height: 0.35rem;
    margin: 1rem auto 0;
  }
  .circle > span {
    width: 0.35rem;
    height: 0.35rem;
    margin-left: 0.2rem;
    position: relative;
    display: block;
    float: left;
    border-radius: 50%;
    background: #D8D8D8;
  }
  .circle > span:first-child {
    margin-left: 0;
  }
  .circle > span > span {
    width: 0.2rem;
    height: 0.2rem;
    position: absolute;
    top: 50%;
    left: 50%;
    transform: translate(-50%, -50%);
    display: block;
    border-radius: 50%;
    background: #000;
    display: none;
  }
  .circle > span:first-child > span {
    display: block;
  }
  .performance, .stable, .community, .ecology, .tool, .partner {
    height: 13rem;
  }
  .tool {
    border: 0;
  }
  .performance div, .community div, .ecology div, .tool div, .partner div {
    width: 8rem;
  }
  .stable > div {
    width: 9rem;
    position: absolute;
    top: 50%;
    left: 50%;
    transform: translate(-50%, -50%);
    text-align: center;
    overflow: hidden;
  }
  .stable > div > div {
    width: 100%;
    margin-top: 1.9rem;
  }
  .stable > div > div > div {
    width: 4rem;
    height: 2.5rem;
    margin-left: 1rem;
    float: left;
  }
  .stable > div > div > div:nth-child(2n + 1) {
    margin-left: 0;
  }
  .stable > div > div > div:nth-child(3), .stable > div > div > div:nth-child(4) {
    margin-top: 1.9rem;
  }
  .stable > div img {
    width: 1.4rem;
  }
  .stable > div p {
    margin-top: 0.36rem;
  }
  .partner img {
    width: 100%;
  }




    /* 成功案例 */


    .success_demo{
      height: 500px;
      position: relative;
      overflow: hidden;
    }
    .success_demo .slider_nav{
      height: 50px;
      width: 100%;
      display: flex;
      background-color: #1a1a1a;
      position: relative;
    }
    .slider_nav span{
      content: '';
      width: 25%;
      height: 3px;
      position: absolute;
      bottom:0;
      left:0;
      background-color: #efefef;
    }
    .success_demo .slider_nav div{
      flex: 1;
    }
    .success_demo .slider_nav p{
      line-height: 50px;
      font-size: 10px;
      text-align: center;
      color: #888;
      white-space:nowrap;
      
    }
    .success_demo .slider_nav p.active{
      color: #efefef;
    }
    .success_demo .slider_text{
      height: 100%;
      width: 100%;
      box-sizing: border-box;
      position: absolute;
      color:#efefef;
      
    }
    .success_demo .slider_text .slider_text_block{
      height: 100%;
      width: 70%;
      margin:40px 15% 0px;
      position: absolute;
      top: 0;
      left:100%;
    }
    .success_demo .slider_text .slider_text_block h1{
      font-size: 24px;
      line-height: 1.5;
      margin-top:-20px;
      text-align: center;
      font-weight: bolder;
    }
    .success_demo .slider_text .slider_text_block h3{
      font-size:12px;
      text-align: center;
      font-weight: bold;
      line-height: 3;
    }
    .success_demo .slider_text .slider_text_block p{
      font-size:12px;
      line-height: 2;
      text-align: center;
    }
    .success_demo .slider_img{
      position: relative;
      height: 200px;
      width: 100%;

    }
    .success_demo .slider_img .slider_image{
      position: absolute;
      top:0;
      left: -3000px;
      width: 100%;
    }
    .success_demo .slider_img .slider_image img{
      height: 200px;
      object-fit: cover;
      width: 100%;
    }
    .success_demo .slider_img .slider_image.active{
      transform: translateX(1000) 3s;
    }

}