.core-item {
  width: 1390px;
  padding: 80px 0;
  display: flex;
  justify-content: center;
  align-items: center;
  flex-direction: row;
}
.core-item:nth-child(2n) {
  flex-direction: row-reverse;
}

.core-item-cover {
  width: 745px;
  overflow: hidden;
}
.core-item-cover img {
  width: 100%;
  height: auto;
}

.core-item-content {
  width: 645px;
  height: 428px;
  background: url("../img/core_item_bg.jpg");
  background-size: 100% 100%;
  position: relative;
  padding: 50px;
  box-sizing: border-box;
}

.core-item-content-line {
  position: absolute;
  width: 2px;
  height: 110px;
  right: 80px;
  top: -80px;
  background: #1075b6;
}
.core-item:nth-child(2n) .core-item-content-line {
  position: absolute;
  width: 2px;
  height: 120px;
  left: 80px;
  top: -80px;
  background: #1075b6;
}
.core-item:nth-child(2n) .core-item-content {
  background: url("../img/core_item_bg_nth2.jpg");
}

.core-content-box {
  width: 100%;
}
.core-cover {
  width: 180px;
  height: auto;
}
.core-title {
  font-size: 30px;
  line-height: 100px;
}
.core-content {
  font-size: 14px;
  line-height: 30px;
}
.core-content p:nth-child(2) {
  font-size: 16px;
}

@media screen and (max-width: 414px) {
  /*.main-title,.foot,.copy-right{display:none;}*/
  .main {
    width: 100%;
  }
  .core-item-content-line {
    display: none;
  }
  .core-item-cover {
    width: 100%;
  }
  .core-item {
    width: 100%;
    flex-direction: column;
    padding: 2em 0;
  }
  .core-item-content {
    width: 100%;
    height: auto;
    padding: 1em;
  }
  .core-item:nth-child(2n) {
    flex-direction: column;
  }
}