.flex-box{
  display: flex;
  justify-content: space-between;
  flex-wrap: wrap;
}
.banner{
  width: 100%;
  height: 158px;
  background: url(/img/support/policy-banner.png) center;
  padding: 54px 20px 49px;
  box-sizing: border-box;
  text-align: center;
}
.banner .content{
  max-width: 646px;
  text-align: left;
  margin: auto;
  margin-left: 346px;
}
h1{
  color: #3F3F3F;
  font-size: 45px;
  line-height: 48px;
  font-weight: 600;
  position: relative;
}
.product h2{
  font-size: 40px;
  font-weight: 700;
  line-height: 48px;
}
.product{
  text-align: center;
  padding-top: 100px;
  margin-bottom: 80px;
  background-color: #F9FFFF;
}
.product .flex-box{
  width: 100%;
  padding-left: 20px;
  padding-right: 20px;
  box-sizing: border-box;
  justify-content: space-between;
}
.product .item_box{
  max-width: 330px;
  width: 100%;
  box-sizing: border-box;
  border-top: 5px solid #1ABC9C;
  margin: 40px 10px 0px;
  background: url(/img/about/product-bg.jpg) no-repeat #f7f7f7;
  background-position: bottom right;
  background-size: cover;
}
.product .item{
  padding: 40px;
  background: #fff;
  opacity: 0.92;
  height: 100%;
}
.product .item>img{
  min-height: 81px;
  width: auto;
  display: block;
  margin: auto;
}
.product .item .title{
  display: inline-block;
  text-align: center;
  margin: 20px auto 0px;
  font-size: 28px;
  color: #1E2432;
  line-height: 34px;
}
.product .item .title:hover{
  color: #2AD9C2;
}
.product .item .des{
  font-size: 16px;
  line-height: 28px;
  color: rgb(122, 122, 122);
  margin-top: 50px;
  margin-bottom: 30px;
  min-height: 84px;
}
.btn{
  text-align: center;
  margin-top: 50px;
}
.btn a{
  display: inline-block;
  min-width: 182px;
  height: 50px;
  line-height: 50px;
  font-size: 20px;
  font-weight: 600;
  background: #1ABC9C;
  border-radius: 6px;
  box-sizing: border-box;
  color: #fff;
  margin: 20px auto 0px;
  position: relative;
  transition: all .5s;
  cursor: pointer;
  padding-left: 10px;
  padding-right: 10px;
}
.btn a:hover{
  background: #12AB8D;
  transform: translateY(-10px);
}
.btn a::before{
  content: "";
  clear: both;
  position: relative;
  background: url(/img/about/windows.svg) center no-repeat;
  background-size: 24px 24px;
  width: 20px;
  height: 20px;
  display: inline-block;
  vertical-align: -3px;
  margin-right: 6px;
}
.btn a.win::before{
  background: url(/img/about/windows.svg) center no-repeat;
  background-size: 24px 24px;
}
.btn a.mac::before{
  background: url(/img/about/mac.svg) center no-repeat;
  background-size: 24px 24px;
}
@media (max-width: 1140px){
  .product .item_box{
    width: 50%;
  }
}
@media (max-width: 767px){
  h1{
    font-size: 32px;
  }
  .product .flex-box{
    flex-wrap: wrap;
    flex-direction: column;
    align-items: center;
  }
  .product .item_box{
    width: 100%;
    max-width: 520px;
  }
}
@media (max-width: 500px){
  .banner{
    height: auto;
  }
}
@media (max-width: 360px){
  .product .item{
    padding: 40px 20px;
  }
  .product .item_box{
    margin: 40px auto 0px;
  }
  .product .flex-box{
    padding-left: 0px;
    padding-right: 0px;
  }
}