.sec1 .item {
  width: 372px;
  height: 233px;
  border-radius: 4px;
  margin-right: 32px;
  position: relative;
  overflow: hidden;
  float: left;
  transition: all .5s;
  cursor: pointer;
}

.sec1 .item:hover {
  box-shadow: 0px 4px 9px 0px rgba(52, 68, 107, 0.5);
  transform: translateY(-10px);
}

.sec1 .item:last-child {
  margin-right: 0;
}

.sec1 .item .img {
  width: 100%;
}

.sec1 .item .mask {
  width: 100%;
  height: 100%;
  position: absolute;
  left: 0;
  top: 0;
  background: linear-gradient(180deg, rgba(30, 40, 62, 0), #1E283E);
  padding: 112px 27px 0;
  text-align: center;
  color: #fff;
}

.sec1 .item .mask .title {
  font-size: 24px;
  font-weight: 600;
  line-height: 33px;
}

.sec1 .item .mask .desc {
  font-size: 16px;
  line-height: 22px;
  margin-top: 10px;
}

.sec1 .btn-solid {
  margin: 50px auto 0;
}

.sec2 {
  background-color: #F9FAFF;
}

.sec2 .sec-content{
  position: relative;
}

.sec2 .sec-content .sec2-layout1 {
  width: 100%;
  height: 187px;
  position: absolute;
  left: 0;
  top: 85px;
  background: rgba(0, 0, 0, 0.7);
  display: flex;
  flex-direction: column;
  align-items: center;
  justify-content: center;
  cursor: pointer;
  opacity: 0;
  transition: opacity .5s;
}

.sec2 .sec-content .sec2-layout2 {
  width: 100%;
  height: 187px;
  position: absolute;
  left: 0;
  top: 285px;
  background: rgba(0, 0, 0, 0.7);
  display: flex;
  flex-direction: column;
  align-items: center;
  justify-content: center;
  cursor: pointer;
  opacity: 0;
  transition: opacity .5s;
}

.sec2 .sec-content  .sec2-layout3 {
  width: 100%;
  height: 187px;
  position: absolute;
  left: 0;
  top: 470px;
  background: rgba(0, 0, 0, 0.7);
  display: flex;
  flex-direction: column;
  align-items: center;
  justify-content: center;
  cursor: pointer;
  opacity: 0;
  transition: opacity .5s;
}

.sec2 .sec-content .sec2-layout1:hover,
.sec2 .sec-content .sec2-layout2:hover,
.sec2 .sec-content .sec2-layout3:hover {
  opacity: 1;
}

.sec2 .sec-content .title {
  font-size: 20px;
  line-height: 28px;
  color: #fff;
}

.sec2 .sec-content .desc {
  font-size: 14px;
  line-height: 22px;
  color: #fff;
  margin-top: 10px;
  padding: 4px 17px;
  background: #2D78F4;
  border-radius: 15px;
}

.sec2 .btn-solid {
  width: 220px;
  margin: 50px auto 0;
}

.sec3 .sec-content {
  padding-left: 100px;
  padding-right: 100px;
}

.sec3 .item {
  width: 460px;
  height: 144px;
  background: #2C78F4;
  border-radius: 17px;
  margin: 40px 20px 0;
  display: flex;
  align-items: center;
  float: left;
  transition: all .5s;
  cursor: pointer;
}

.sec3 .item:hover {
  transform: translateY(-10px);
  box-shadow: 0px 4px 9px 0px rgba(52, 68, 107, 0.5);
}

.sec3 .item .img-box {
  margin-left: 23px;
}

.sec3 .item .text-box {
  margin-left: 14px;
}

.sec3 .item .text-box p {
  font-size: 18px;
  color: #fff;
  line-height: 32px;
}

.sec3 .item .text-box p:first-child {
  font-weight: 600;
  font-size: 20px;
}

.sec4 {
  padding-bottom: 0;
  background: #F9FAFF;
}

.sec4 .sec-content {
  padding: 0;
}

.sec4 .item-container {
  width:100%;
  height: 610px;
}

.sec4 .item-container:nth-child(2n) {
  background: #fff;
}

.sec4 .item-wrapper {
  width: 1200px;
  height: 100%;
  margin: auto;
  display: flex;
  align-items: center;
}

.sec4 .item-wrapper .img-box {
  width: 600px;
  text-align: center;
}

.sec4 .item-wrapper .text-box {
  width: 600px;
  padding-left: 80px;
}

.sec4 .item-wrapper .title {
  font-size: 28px;
  color: #333;
  line-height: 40px;
  font-weight: 600;
}

.sec4 .item-wrapper .desc {
  margin-top: 30px;
  line-height: 28px;
  font-size: 18px;
  color: #666;
}

.sec4 .item-wrapper .btn-solid {
  margin-top: 50px;
}