.introduction {
  width: 100%;
  height:43.7rem;
  background: url(../img/companybuild.png) no-repeat;
  background-position: top center;
  position: relative;
}
.introduction .cover{
  width:102rem;
	height: 1rem;
	background-color: #aa0021;
  position: absolute;
  bottom: 0;
  right: 0;
}
.introduction>div:nth-child(1) {
  position: relative;
  width: 86rem;
  height: 100%;
  margin: 0 auto;
}

.introduction .txt {
  width: 58rem;
  font-family: 'Arial';
  font-size: 1rem;
  line-height: 1.88rem;
  color: #ffffff;
  padding-top: 4.13rem;
  position: absolute;
  top: 20rem;
  left: 0;
}
.introduction .txt a{
  font-family: 'Arial';
  font-size: .9rem;
  text-align: center;
  width: 5rem;
	height: 2rem;
	border: solid 1px #ffffff;
  display: block;
  color: #ffffff;
  margin-top: .8rem;
  overflow: hidden;
  z-index: 5;
  position: relative;
}
.introduction .txt a:after{
  content: "";
  width: 6rem;
  height: 100%;
  position: absolute;
  left: -6rem;
  top: 0;
  background-color: #ffffff;
  transition: all .4s;
  z-index: -1;
}
.introduction .txt a:hover{
  color: #000000;
}
.introduction .txt a:hover::after{
  left: 0rem;
  transition: all .4s;
}
.introduction .txt::before {
  content: "";
  width: 6.25rem;
  height: 0.06rem;
  background-color: #ffffff;
  position: absolute;
  top: 0;
  left: 0;
}


.introduction .b_title {
  font-family: 'AlimamaShuHeiTiBold';
  font-size: 3.75rem;
  color: #ffffff;
  font-style: italic;
  position: absolute;
  left: 0;
  bottom: 6.25rem;
}
.mid-txt{
  height: 12.7rem;
  background: url(../img/mid-txt.jpg) no-repeat;
  background-position: center;
}
.mid-txt p{
  font-family: 'ArialMTBold';
  font-size: 1.7rem;
	font-weight: 700;
	color: #000000;
}
.business {
  width: 100%;
  height: auto;
  background-color: #262626;
  padding-bottom: 3rem;
}

.business>div {
  width: 86rem;
  height: 100%;
  margin: 0 auto;
  align-items: stretch;
}

.business .left_nav {
  font-family: 'BodoniMTItalic';
  font-size: 3rem;
  line-height: 2.5rem;
  padding-top: 6.15rem;
  margin-right: 3.78rem;
  flex-shrink: 0;
}

.business .left_nav>div {
  color: #ffffff;
}

.business .left_nav>div span {
  display: block;
  width: 3.31rem;
  height: 0.75rem;
  overflow: hidden;
  position: relative;
  margin-top: 1.3rem;
}

.business .left_nav>div img {
  width: 100%;
  position: absolute;
  left: -4rem;
  transition: all .3s;
}

.business .left_nav .active img {
  left: 0;
  transition: all .3s;
}

.business .left_nav>div:hover {
  color: #ffffff;
}

.business .item_box>div {
  align-items: flex-start;
  flex-wrap: wrap;
  display: none;
}

.business .item_box>div.active {
  display: flex;
}

.business .detail {
  background: #ffffff;
  width: 100%;
  padding: .25rem;
  margin-top: 1px;
}

.business .item_box .item {
  height: 16.25rem;
  background: #ffffff;
  padding: .25rem;
}
.business .item_box .item>div{
  width: 100%;
  height: 100%;
  position: relative;
  background-position: top center;
  background-size:  100%auto; 
  background-repeat: no-repeat;
  transition: all .4s;
  cursor: pointer;
}
.business .item_box .item>div::after {
  content: "";
  width: 100%;
  height: 100%;
  background: rgba(0, 0, 0, .6);
  position: absolute;
  top: 0;
  left: 0;
  transition: all .3s;
  opacity: 1;
}

.business .item_box .item>div::before {
  content: "";
  width: 100%;
  height: 10rem;
  background: linear-gradient(to bottom, transparent 0%, #000000 70%);
  position: absolute;
  bottom: 0;
  left: 0;
}
.business .item_box .item2>div::before{
  bottom: auto;
  top: 0;
  height: 100%;
  width: 20rem;
  background: linear-gradient(to left, transparent, #000000);
}
.business .item_box .item1>div {
  background-image: url(../img/pic1.png);
}

.business .item_box .item2>div  {
  background-image: url(../img/pic2.png);
}

.business .item_box .item3>div  {
  background-image: url(../img/pic3.png);
}

.business .item_box .item4>div  {
  background-image: url(../img/pic4.png);
}

.business .item_box .item5>div  {
  background-image: url(../img/pic5.png);
}

.business .item_box .item6>div  {
  background-image: url(../img/pic6.png);
}

.business .item_box .item7>div  {
  background-image: url(../img/pic7.png);
}

.business .item_box .item8>div  {
  background-image: url(../img/pic8.png);
}

.business .item_box .item9>div  {
  background-image: url(../img/pic9.png);
}

.business .item_box .item10>div  {
  background-image: url(../img/pic10.png);
}

.business .item_box .item_w5 {
  width: 50%;
}

.business .item_box .item_w31 {
  width: 31.5%;
}
.business .item_box .item_w37 {
  width: 37%;
}
.business .item_box .txt {
  width: 100%;
  position: absolute;
  z-index: 5;
  text-align: center;
  bottom: 2rem;
  align-items: stretch;
  transition: all .4s;
}

.business .item_box .item:hover .txt {
  transition: all .4s;
  bottom: 4rem;
}
.business .item_box .item>div:hover::after{
  opacity: 0;
  transition: all .3s;
}
.business .item_box p {
  font-family: 'avanti';
  font-size: 1.08rem;
  line-height: 1.6rem;
  color: #ffffff;
}

.business .item_box .txt span {
  font-size: 0.7rem;
  color: #b3b3b3;
  font-family: 'PuHuiTi-r';
  text-align: left;
  display: block;
}
.business .item_box .txt_wrap{
bottom: auto;
left: 1.9rem;
top: 3rem;
}
.business .item_box .txt_wrap>div{
  margin-bottom: 1.5rem;
}
.business .item_box .txt_wrap p {
  width: auto;
  height: 1.38rem;
  line-height: 1.38rem;
  margin-bottom: .5rem;
  text-align: left;
}

@media (max-width: 850px) {
  .mid-txt p{
    font-size: 1.8rem;
    line-height: 2.4rem;
  }
  .introduction {
    height: auto;
    padding-top: 10rem;
    padding-bottom: 5rem;
  }

  .introduction>div {
    padding: 0 1.5rem;
  }
  .introduction>div:nth-child(1){
    width: auto;
  }
  .introduction .txt {
    width: 100%;
    font-size: 1.2rem;
    position: relative;
    line-height: 2.25rem;
    padding-top: 0;
    top: 0;
  }

  .introduction .txt::before {
    display: none;
  }

  .introduction .b_title {
    font-size: 2.7rem;
    text-align: center;
    position: relative;
    top: 0;
    margin-top: 18rem;
  }

  .introduction .txt a{
    width: 6rem;
    height: 2.3rem;
    margin-top: 1.2rem;
  }

  .business {
    height: auto;
  }

  .business>div {
    width: 100%;
    flex-direction: column;
  }

  .business .left_nav {
    margin-right: 0;
    display: flex;
    padding-top: 2.75rem;
    margin-bottom: 1.5rem;
  }

  .business .left_nav>div {
    text-align: left;
  }

  .business .left_nav>div span {
    display: none;
  }
  .business>div{
    padding: 0 1rem;
  }
  .business .item_box .item_w5 {
    width: 100%;
    background-position: center -3rem !important;
  }

  .business .item_box .item {
    height: 14.45rem;
  }
.business .item_box .item6,.business .item_box .item8{width:50%}
  .business .item_box .item>div{
    background-size: 100% ;
  }
  .business .item_box .item_w31 p,
  .business .item_box .item_w37 p{
    font-size: 1.2rem;
  }

  .business .item_box .txt_wrap {
    bottom: auto;
    left: 1.1rem;
    top: 2.1rem;
}
}

@media (max-width: 640px) {
  .business .item_box .item_w31 >div,
    .business .item_box .item_w37 >div{
    background-size:auto  100% ;
  }
}