*{
  padding: 0;
  margin: 0;
}
html,body{
  min-width: 1200px;
  position: relative;
}
body{
  height: auto;
}
/* 导航栏 */
.nav{
  display: flex;
  align-items: center;
  background-color: #3B3539;
  height: 60px;
  padding: 0 20px;
}
.nav .nav-logo{
  height: 60px;
  color: #fff;
  flex: 1;
  display: flex;
  align-items: center;
  font-weight: bold;
  font-size: 1.2rem;
}
.nav .nav-logo img{
  width: 30px;
  height: 30px;
  margin-right: 10px;
}
.nav .nav-menu{
  display: flex;
  justify-content: flex-end;
}
.nav .nav-menu li{
  list-style: none;
  color: #fff;
  cursor: pointer;
}
.nav .nav-menu li:not(:last-child) {
  margin-right: 20px;
}

/* u1 */
.u1{
  display: flex;
  height: 650px;
  width: 100%;
  position: relative;
  justify-content: center;
}
.u1 .u1-left{
  background-color: #3B3539;
  width: 40%;
  display: flex;
  flex-direction: column;
  align-items: center;
  justify-content: center;
  position: relative;
}
.u1 .u1-left>div:not(.contact-btn){
  width: 80%;
  text-align: left;
  color: #fff;
}
.u1 .u1-left .contact-btn{
  width: 80%;
  margin-top: 50px;
}
.u1 .u1-left .contact-btn button{
  padding: 5px 20px;
  border-radius: 20px;
  -webkit-border-radius: 20px;
  -moz-border-radius: 20px;
  -ms-border-radius: 20px;
  -o-border-radius: 20px;
  cursor: pointer;
  border: 4px solid #fff;
  font-size: 1rem;
}
.u1 .u1-right{
  width: 60%;
}
.u1 .u1-right img{
  width: 100%;
  height: 100%;
}
/* u1-float */
.u1 .u1-float{
  width: 70%;
  height: 160px;
  background-color: #fff;
  border-radius: 8px;
  -webkit-border-radius: 8px;
  -moz-border-radius: 8px;
  -ms-border-radius: 8px;
  -o-border-radius: 8px;
  position: absolute;
  bottom: -80px;
  display: flex;
  align-items: center;
}
.u1 .u1-float .u1-float-left{
  width: 35.6%;
  border-right: 1px solid #CCCCCC;
  display: flex;
  flex-direction: column;
  align-items: center;
}
.u1 .u1-float .u1-float-left>div{
  width: 60%;
}
.u1 .u1-float .u1-float-right{
  width: 60%;
  display: flex;
}
.u1 .u1-float .u1-float-right>div{
  width: 25%;
  text-align: center;
  color: #666666;
}
.u1 .u1-float .u1-float-right>div span{
  font-size: 1.5rem;
  font-weight: bold;
}
.u1 .u1-float .u1-float-right>div>div:last-child{
  margin-top: 10px;
  font-size: 0.9375rem;
}
/* u2 */
.u2{
  height: 600px;
  background-color: #999999;
  padding-top: 80px;
  display: flex;
  flex-direction: column;
  align-items: center;
}
.u2 .slogan{
  text-align: center;
  padding: 40px;
  color: #CCCCCC;
}
.u2-tab{
  width: 70%;
  display: flex;
  height: 400px;
}
.u2-tab-left{
  width: 36%;
  display: flex;
  flex-direction: column;
  align-items: center;
  justify-content: center;
}
.u2-tab-left button{
  background-color: #007CFF;
  color: #fff;
  padding: 8px 20px;
  border: none;
  display: block;
  margin: 10px 0;
  font-size: 1.2rem;
  cursor: pointer;
}
.u2-tab-right{
  height: 100%;
  width: 64%;
  display: flex;
  align-items: center;
  justify-content: center;
}
.u2-tab-right img{
  height: 100%;
}
/* u3 */
.u3{
  padding: 5% 10%;
  background-color: #EEEEEE;
}
.u3 .u3-top{
  display: flex;
  flex-wrap:wrap;
  justify-content:space-between;
}
.u3 .u3-card{
  background-color: #fff;
  margin-bottom: 30px;
  border-radius: 4px;
  -webkit-border-radius: 4px;
  -moz-border-radius: 4px;
  -ms-border-radius: 4px;
  -o-border-radius: 4px;
  width: 30%;
  display: flex;
}
.u3 .u3-card img{
  width: 80px;
  height: 80px;
  margin: 20px;
}
.u3 .u3-card>div{
  display: flex;
  flex-direction: column;
  justify-content: center;
  margin-left: 10px;
}
.u3 .u3-card>div>div:first-child{
  font-size: 18px;
  margin-bottom: 8px;
  font-weight: bold;
  color: #000;;
}
.u3 .u3-card>div>div:last-child{
  color: #999999;
}
.u3-bottom{
  display: flex;
}
.u3-bottom-left{
  width: 65%;
  display: flex;
  flex-wrap: wrap;
  justify-content: space-between;
}
.u3-bottom-left .u3-card{
  width: 46%;
}
.u3-bottom-right{
  width: 30%;
  margin-left: 5%;
  position: relative;
}
.u3-bottom-right img{
  width: 100%;
  height: 90%;
  position: absolute;
  left: 0;
  top: 0;
}
.u3-bottom-right .u3-cover{
  position: absolute;
  width: 100%;
  height: 90%;
  display: flex;
  flex-direction: column;
  justify-content: center;
  align-items: center;
}
.u3-bottom-right .u3-cover>div:first-child{
  color: #fff;
  font-weight: bold;
  font-size: 24px;
  margin-bottom: 20px;
}
.u3-bottom-right .contact-btn button{
  padding: 5px 20px;
  border-radius: 20px;
  -webkit-border-radius: 20px;
  -moz-border-radius: 20px;
  -ms-border-radius: 20px;
  -o-border-radius: 20px;
  cursor: pointer;
  border: 4px solid #fff;
  font-size: 1rem;
}
.footer{
  height: 80px;
  background-color: #fafafa;
  display: flex;
  align-items: center;
  justify-content: center;
}
/* modal */
.modal{
  position: fixed;
  width: 30%;
  height: 60%;
  background-color: #fff;
  left: 50%;
  top: 50%;
  transform: translate(-50%, -50%);
  -webkit-transform: translate(-50%, -50%);
  -moz-transform: translate(-50%, -50%);
  -ms-transform: translate(-50%, -50%);
  -o-transform: translate(-50%, -50%);
  box-shadow: 0 0 10px 10px rgba(0,0,0,0.2);
  display: none;
}
.modal-header{
  padding: 10px 10px 10px 20px;
  background-color: #3B3539;
  color: #fff;
  display: flex;
}
.modal-header>div:first-child{
  flex: 1;
}
.modal-header .close{
  cursor: pointer;
}
.modal-body{
  width: 100%;
  padding: 20px 0;
}
.modal .form-item{
  width: 100%;
  display: flex;
  align-items: center;
  padding: 10px;
}
.modal .form-item>div:first-child{
  width: 20%;
  padding: 0 20px;
  text-align: right;
}
.modal .form-item>div:last-child{
  width: 80%;
}
.modal .form-item>div:last-child>input{
  width: 80%;
  height: 30px;
  border-radius: 4px;
  -webkit-border-radius: 4px;
  -moz-border-radius: 4px;
  -ms-border-radius: 4px;
  -o-border-radius: 4px;
  border: 1px solid rgb(175, 171, 171);
  padding: 3px 10px;
}
.modal-footer{
  text-align: center;
}
.modal-footer button{
  background-color: #007CFF;
  color: #fff;
  border: 0;
  padding: 8px 10px;
  border-radius: 4px;
  -webkit-border-radius: 4px;
  -moz-border-radius: 4px;
  -ms-border-radius: 4px;
  -o-border-radius: 4px;
  cursor: pointer;
}