.banner {
  height: 437px;
  background: url(../../../images/openPlatform/banner.jpg) no-repeat;
  background-size: cover;
}
.banner .t1,
.banner .t2 {
  font-weight: 500;
  color: #fff;
  text-align: center;
}
.banner .t2 img {
  padding: 5px;
}
.banner .t1 {
  font-weight: 400;
  padding-top: 140px;
  font-size: 50px;
}
.banner .t2 {
  font-weight: 300;
  font-size: 25px;
  padding-top: 10px;
  padding-bottom: 30px;
}

.txt {
  text-align: center;
  color: #3a416f;
  font-size: 40px;
  font-weight: 500;
  padding-bottom: 22px;
}
.subtxt {
  text-align: center;
  font-size: 18px;
  font-weight: 200;
  color: rgb(176, 179, 197);
}
.plan {
  padding: 100px 0;
}
.plan .box {
  display: flex;
  width: 1200px;
  margin: 0 auto;
  padding-top: 30px;
}
.plan .box li {
  width: 380px;
  height: 260px;
  margin-right: 28px;
  background-position: center center;
  background-repeat: no-repeat;
}

.plan .box .bg {
  width: 100%;
  height: 100%;
  position: relative;
  overflow: hidden;
}

.plan .box li .atitle {
  width: 100%;
  position: absolute;
  top: 120px;
  text-align: center;
  font-size: 20px;
  font-weight: 500;
  color: #fff;
  transition: top linear 0.3s;
}

.plan .box li .article {
  width: 100%;
  padding: 0 66px;
  position: absolute;
  line-height: 20px;
  text-align: center;
  font-size: 14px;
  font-weight: 400;
  color: #fff;
  top: 270px;
  transition: top linear 0.3s;
}
.plan .box li:hover {
  background-size: 110%;
}
.plan .box li:hover .bg {
  background: rgba(2, 129, 255, 0.5);
}

.plan .box li:hover .atitle {
  top: 66px;
}
.plan .box li:hover .article {
  top: 120px;
}

.plan .box li:nth-of-type(1) {
  background-image: url('../../../images/openPlatform/slider1.png');
}

.plan .box li:nth-of-type(2) {
  background-image: url('../../../images/openPlatform/slider2.jpg');
}

.plan .box li:nth-of-type(3) {
  background-image: url('../../../images/openPlatform/slider3.jpg');
  margin-right: 0;
}