body{
  margin: 0px;
  padding: 0px;
}
span,li{
  font-family:"Microsoft YaHei",Arial,Helvetica,sans-serif,"宋体";
}

a{
  text-decoration: none;
  color: #000;
}
a:hover{
  color: -webkit-link;
}
.nebula-screen1{
  background-image: url('images/bg.png');
  background-repeat: no-repeat;
  background-size: cover;
  width: 100%;
  position: relative;
  height: 100%;
}


.header-nav ul{
  padding: 0em;
  margin: 0em;
  list-style-type: none;
}
.header-nav li{
  inline-block:true;
  float:left;
  cursor: pointer;
  padding-left: 2em;
  padding-right: 2em;
}
.header-nav li a{
  color: #fff;
  font-size: 1rem;
}
@media only screen and (min-width: 768px) {
  .header-slogan{
    cursor: pointer;
    padding-left: 6em;
    padding-top: 2em;
    float: left;
  }
}

@media only screen and (max-width: 768px) {
  .header-slogan{
      width: 165px;
      padding: 0px;
      margin: 0 auto;
      padding-top: 2em;
      clear: left;
  }
}

.header-slogan span{
  color: #fff;
  margin:auto; display:table;
  font-family:Cursive;
  font-weight:bold;
  font-size: 1.5em;
}
@media only screen and (min-width: 768px) {
  .header-nav{
    padding-top: 2em;
    float: right;
    padding-right: 6em;
  }
}

@media only screen and (max-width: 768px) {
  .header-nav{
    padding-top: 2em;
    margin: 0 auto;
    width: 100%;
  }
  .header-nav ul{
    /* display: table; */
    padding: 0em;
    width: 296px;
    margin: 0 auto;
  }
  .header-nav li{
    padding-left: 1em;
    padding-right: 1em;
  }
}

.nebula-screen1-content{
  width: 100%;
  position: absolute;
}

@media only screen and (min-width: 768px) {
  .nebula-screen1-content{
    top: 40%;
  }
}

.nebula-slogan{
  width: 400px;
  margin-left: auto;
  margin-right: auto;
}
@media only screen and (max-width: 768px) {
  .nebula-screen1-content{
    bottom: 15%;
  }
  .nebula-slogan{
    width:90%;
  }
}

.nebula-slogan span{
  color: #fff;
  display: block;
  font-size: 2em;
  text-align:center;
}
.nebula-screen1-contact{
  width: 200px;
  margin-top: 32px;
  height: 48px;
  margin-left: auto;
  margin-right: auto;
  background-color: #1E88F5;
  border-radius: 4px;
  cursor: pointer;
  text-align: center;
}
.nebula-screen1-contact span{
  color: #fff;
  height:48px;
  line-height: 48px;
}
.nebula-screen1-contact:hover{
  background-color: #4c96d8;
}
.nebula-screen2{
  position: relative;
  background-color: #fff;
  margin-top: 30px;
}
.nebula-screen2-content{
  text-align: center;
  margin-left: auto;
  margin-right: auto;
}
.nebula-service{
  text-align: center;
}
@media only screen and (min-width: 768px) {
  .nebula-screen2{
    width: 100%;
    height: 100%;
  }
  .nebula-screen2-content{
    text-align: center;
    height: 300px;
    width: 840px;
    margin-top: 160px;
    margin-left: auto;
    margin-right: auto;
  }
  .nebula-service{
    width: 180px;
    float: left;
    margin-left: 50px;
    margin-right: 50px;
  }
}
@media only screen and (max-width: 768px) {
  .nebula-screen2{
    width: 100%;
    height: 130%;
  }
  .nebula-screen2-content{
    text-align: center;
    height: 300px;
    width: 100%;
    margin-top: 50px;
  }
  .nebula-service{
    width: 80%;margin: 0 auto;
  }
}
.nebula-service-icon{
  width: 96px;
  height: 96px;
}
.nebula-service-title{
  color: #0D253E;
  display: block;
  margin: 1.2em;
  font-size: 1em;
}
.nebula-service-content{
  margin: 1em;
  display: block;
  color: #9ea8b2;
  line-height: 1.5em;
  font-size: 0.9em;
}
.nebula-title{
  display: block;
  text-align: center;
  width: 100%;
  color: #0D253E;
  font-size: 32px;
  padding-top: 2em;
}

.nebula-screen3{
  background-color: #fff;
  width: 100%;
  height: 100%;
}
.nebula-contact-content{
  width: 350px;
  margin:150px auto;
}
.nebula-contact-item{
  margin: 1.5em;
}
.nebula-contact-item img{
  width: 16px;
  max-height: 1em;
}
.nebula-contact-item span{
  line-height: 1em;
  color: #464646;
  font-size: 1em;
  height: 1em;
}

.nebula-img{
  margin-right: auto;
  margin-left: auto;
}
.nebula-img img{
  position: absolute;
  bottom: 5%;
}

.case{
  position: relative;
  background-color: #fff;
  width: 100%;
  height: 100%;
}

.nebula-content{
  display: block;
  text-align: center;
  color: #9ea8b2;
  width: 50%;
  margin-left: auto;
  margin-right: auto;
  line-height: 1.5em;
  margin-top: 1.5em;
  font-size: 1.1em;
}
@media only screen and (max-width: 768px) {
  .nebula-contact-content{
    width: 89%;
  }
  .nebula-img{
    width: 90% !important;
    margin: 0 auto;
  }
  .nebula-img img{
    width: 90% !important;
  }
  .case{
    height: 90%;
  }
  .nebula-content{
    width: 90%;
  }
}