/* 适应640px以上，768px以下设备 */

@media only screen and (min-width: 641px) and (max-width: 1220px) {
  /* 背景图片 */
  .bg {
      width:100%;
      background-image: url('../images/bg.png');
      background-position: center top;
      background-repeat: no-repeat;

  }
  /* 导航栏 */
  header {
      margin: 0 auto;
      width: 95%;
  }
    .container{
        max-width:1100px;
    }
  header img {
      float: left;
      width: 32%;
      box-shadow: 0px 25px 50px rgba(0, 0, 0, 0.25);
  }
  .navbar-toggle{
      width: 3rem;
      height: 3rem;
      margin-top: 10px;
  }

    .navbar-toggle .icon-bar+.icon-bar {
        margin-top: 10px;
    }

    .navbar-toggle .icon-bar{
        width:40px;
    }

    .navbar-default .navbar-toggle:hover{
        background-color:transparent;
    }
    .navbar-default .navbar-toggle:focus{
        background-color:transparent;
    }
    .navbar-default .navbar-toggle{
        border:none;
    }
    .header_position{
        margin-right: 4rem;
    }
    .navbar-collapse::-webkit-scrollbar {
        width: 0;
        height: 0;
    }
  header .header_word {
      float: right;
      color: #fff;
      font-size: 0.9rem;
      font-weight: bold;
  }

  header .header_word li {
      display: inline-block;
      padding-top: 2rem;
      padding-left: 1rem;
  }

  .main_article {
      width: 80%;
      margin: 0 auto;
  }

  .title {
      line-height: 6.5rem;
      font-size: 3rem;    
      color: #fff;
      font-weight: bold;
  }

  .desc {
      padding-top:2rem;
      color: #fff;
      font-size: 1.3rem;
  }

  .arrow_bot {
      display: none;
  }

  .arrow_small_right {
      display: none;
  }

  .contact_btn {
      text-align: center;
      display: block;
      margin-top: 3rem;
  }

  /* 第一部分内容 */
  .pic_article {
      position: relative;
  }
  .arrow_small_left {
      display: none;
  }
  .pic_article_01 {
      width: 100%;
      margin-top: 3.5rem;
  }
  .pic_article_02 {
      width: 100%;
      margin-top: 4.3rem;
  }
  .pic_img_01,.pic_img_02{
      width: 65%;
      display: block;
      margin: 0 auto;
  }

  .pic_article_01 img,
  .pic_article_02 img {
      box-shadow: 0px 25px 50px rgba(0, 0, 0, 0.25);
  }

  /* 内容段落css */
  .pic_detail_01 span {
      text-align: center;
      display: block;
      color: #f07f19;
      font-weight: bold;
      font-size: 1rem;
      margin-top: 3rem;
      margin-bottom: 6px;
  }

  .pic_detail_02 span {
      text-align: center;
      display: block;
      color: #f07f19;
      font-weight: bold;
      font-size: 1rem;
      margin-top: 3rem;
      margin-bottom: 6px;
  }

  .pic_article_01 span img,
  .pic_article_02 span img {
      margin-right: 0.7rem;
  }

  .pic_detail_01,
  .pic_detail_02 {
      text-align: center;
      margin: 0 auto;
      font-size: 1.4rem;
      line-height: 3.5rem;
  }

  /* 分割线 */
  .seperate_line {
      margin: 8rem auto 6rem auto;
      width: 100%;
      border: 1px dashed #ccc;
  }
  /* 第二部分内容 */
  .second_article {
      position: relative;
      margin: 0 auto;
      width: 100%;
  }
  .second_intro_1 {
      text-align: center;
      margin-bottom: 3rem;
  }
  .arrow_right {
      display: none;
  }
  .pic_who{
      display: block;
      width: 50%;
      margin: 0 auto;
  }
  .pic_whyus{
      display: block;
      width: 65%;
      margin: 3rem auto;
  }

  .whyus_details{
      margin: 0 auto;
      width: 65%;
  }
.whyus_details_title{
    text-align: center;
}
  .whyus_details p{
      line-height: 2rem;
      font-size:1rem;
  }

  .whyus_details .whyus_title{
      font-size: 2.7rem;
      font-weight: bold;
  }

  .whyus_para p span{
      display: inline-block;
      line-height: 5rem;
      font-size: 3rem;
      font-weight: bold;
      color:#d9d9d9;
      margin-right: 1rem;
  }
  .whyus_para .para{
      font-size: 1.3rem;
      color:#f07f19;
  }

  .whyus_explain{
        display: block;
        padding-top: 1rem;
      font-size: 1rem;
      line-height: 1.7rem;
  }

  .form {
      margin-top: 5.5rem;
  }
  .form iframe{
      background-image: url("../images/form-bg.jpg");
      background-size: cover;
      background-repeat: no-repeat;
      width: 100%;
      
  }
  /* 第二部分内容里八图展示 */
  .second_dodetails {
      margin: 5rem auto 0 auto;
  }
  .second_dodetails_img{
      text-align: center;
  }
  
  .second_dodetails .img_title {
      font-size: 2rem;
      font-weight: bold;
      text-align: center;  
  }
  .second_dodetails ul li {
      text-align: center;
      width: 30%;
      margin-top: 3rem;
      display: inline-block;
      vertical-align: top;
  }

  .second_dodetails ul li img {
    width: 80%;
}
  .second_dodetails ul li p {
      font-size: 1.2rem;
      font-weight: bold;
      margin-top: 1.3rem;
      margin-bottom: 1rem;
  }
  .second_dodetails ul li span {
      width: 100%;
      display: block;
      line-height: 1.2rem;
      font-size: 0.9rem;
      color: #f07f19;
  }
 /* 视频 */
 .video {
    background-image: url("../images/video-bg.png");
    margin-top: 5.5rem;
}
.video .video_button {
    cursor: pointer;
    display: block;
    margin: 0 auto;
    padding-top: 5rem;
    padding-bottom: 5rem;
}
.ad_video{
    width: 90%;    
    display: none;
    position: fixed;
    top:10%;
    left:10%;
    height:70%;
    z-index: 1999;
}
.ad_video iframe{
    float: left;
    width: 90%;
    margin: 0 auto;
}

.cancel{
    -webkit-user-select: none;
       -moz-user-select: none;
        -ms-user-select: none;
            user-select: none;
        float: left;
        font-size: 2rem;
        color: #fff;
        width: 3rem;
        height: 3rem;
        border-radius: 100%;
        border: none;
        background-color: #000;
}
  /* 合作伙伴 */
  .partners {
      width: 100%;
      margin: 0 auto;
      margin: 5rem auto 6rem auto;
  }
  .partners p {
      width: 53%;
      border-bottom: 4px solid #f07f19;
      padding-bottom: 0.7rem;
      padding-left: 1.7rem;
      font-size: 2rem;
      font-weight: bold;
      margin: 0 auto 4rem auto;
      text-align: center;
  }
  .partners_02{
      margin: 0 auto;
      width: 37%;
      display: block;
  }
  .partners_01 {
      margin: 3rem auto 0 auto;
     width: 60%;
     display: block;
  }

  /* //联系方式按钮 */

      /* 返回顶部按钮 */
      #returnBtn {
        background-color: transparent;
        display: none;
        position: fixed;
        bottom: 20px;
        right: 30px;
        z-index: 99;
        border: none;
        outline: none;
        cursor: pointer;
        padding: 0;
    }
    #returnBtn img{
        width:60px;
        height:60px;
    }

  /* 网页页脚 */
  footer {
      background: url("../images/footer-bg.png") no-repeat;
      background-size: cover;
      width: 100%;
      color: #fff;
      padding-bottom: 1rem;
  }
  .footer_details {
      width: 87%;
      margin: 0 auto;
  }
  .footer_details .footer_logo {
      float: left;
      margin-top: 2.2rem;
      margin-left: 2.5rem;
      margin-right: 3rem;
      width: 36%;
  }
  .footer_details .footer_logo p {
      line-height: 1.7rem;
      font-size: 1rem;
      padding-top: 2rem;
  }
  .footer_contact{
    float: right;
    width: 47%;
  }
  .footer_company {
      float: left;
      margin-top: 2.3rem;
  }
  .footer_company dt {
      line-height: 1.5rem;
      font-size: 1rem;
      font-weight: bold;
  }
  .footer_company dd {
      font-size: 0.9rem;
      line-height: 2.7rem;
  }
  .footer_connect {
      float: left;
      margin-top: 2.3rem;
      margin-left: 6.5rem;
  }
  .footer_connect dt {
      line-height: 1.5rem;
      font-size: 1rem;
      font-weight: bold;
  }
  .footer_connect dd {
      font-size: 0.9rem;
      line-height:2.7rem;
  }
  .footer_date {
      font-size: 0.9rem;
      text-align: center;
  }

/* 视频遮罩层 */
  .bg_mask {
    display: none;
    position: fixed;
    background-color: #666;
    width: 100%;
    height: 100%;
    z-index: 1000;
    top: 0;
    left: 0;
    opacity: 0.7;
}

}

@media (min-width: 768px) and (max-width: 1220px) {
    .container {
        width: 733px;
    }
}