/* ===== sec1.introduction ===== */
.sec1.introduction .wh1200.items1 {
  /* 父级无额外样式，保留选择器 */
}
.sec1.introduction .wh1200.items1 .item {
  flex: 1;
  display: flex;
  flex-direction: row;
  align-items: center;
  justify-content: center;
}
.sec1.introduction .wh1200.items1 .item img {
  object-fit: cover;
  margin: 40px auto 0;
}

/* ===== sec2.features .wh1200.items1 ===== */
.sec2.features .wh1200.items1 {
  display: grid;
  grid-template-columns: 1fr 2fr 1fr;
  grid-template-rows: 1fr 1fr;
  flex-direction: row;
  height: 427px;
  gap: 16px;
  margin-bottom: 88px;
}
.sec2.features .wh1200.items1 .left-top {
  color: white;
  grid-column: 1;
  grid-row: 1;
}
.sec2.features .wh1200.items1 .left-bottom {
  color: white;
  grid-column: 1;
  grid-row: 2;
}
.sec2.features .wh1200.items1 .center {
  color: white;
  grid-column: 2;
  grid-row: 1 / span 2;
  width: auto !important;
  height: auto !important;
}
.sec2.features .wh1200.items1 .right-top {
  color: #2d3436;
  grid-column: 3;
  grid-row: 1;
}
.sec2.features .wh1200.items1 .right-bottom {
  color: white;
  grid-column: 3;
  grid-row: 2;
}
.sec2.features .wh1200.items1 .item {
  display: flex;
  flex-direction: row;
  align-items: flex-start;
  gap: 9px;
  width: 272px;
  height: 101px;
}
.sec2.features .wh1200.items1 .item .item-img {
  width: 58px;
  height: 58px;
  flex-shrink: 0;
}
.sec2.features .wh1200.items1 .item .item-img img {
  object-fit: cover;
}
.sec2.features .wh1200.items1 .item .item-content {
  display: flex;
  flex-direction: column;
  gap: 12px;
  align-items: flex-start;
  justify-content: center;
}
.sec2.features .wh1200.items1 .item .item-content .item-title {
  color: #000000;
  font-size: 22px;
  line-height: 1.4;
}
.sec2.features .wh1200.items1 .item .item-content .item-description {
  color: #666666;
  font-size: 16px;
  line-height: 1.4;
}

/* ===== sec3.advantages .wh1200.items1 ===== */
.sec3.advantages .wh1200.items1 {
  display: flex;
  flex-direction: row;
  gap: 32px;
}
.sec3.advantages .wh1200.items1 .item {
  flex: 1;
  display: flex;
  flex-direction: column;
  background-color: white;
  height: 305px;
  color: white;
  border-radius: 16px;
  box-shadow: 0 4px 9px 3px rgba(0, 75, 225, 0.1);
}
.sec3.advantages .wh1200.items1 .item .item-header {
  height: 140px;
  background-color: #f5f5f5;
  display: flex;
  flex-direction: column;
  align-items: center;
  justify-content: center;
  gap: 17px;
}
.sec3.advantages .wh1200.items1 .item .item-header .item-title {
  font-size: 16px;
  line-height: 1.4;
  color: #fff;
  display: flex;
  width: 130px;
  height: 34px;
  justify-content: center;
  align-items: center;
  background-image: url(../images/temp.png);
}
.sec3.advantages .wh1200.items1 .item .item-header .item-desc {
  font-size: 28px;
  line-height: 1.4;
  color: #fff;
}
.sec3.advantages .wh1200.items1 .item .item-content {
  padding: 38px 35px 31px 38px;
}
.sec3.advantages .wh1200.items1 .item .item-content li {
  list-style-type: none;
  position: relative;
}
.sec3.advantages .wh1200.items1 .item .item-content li::before {
  content: "•";
  color: blue;
  position: absolute;
  left: -10px; /* 将圆点向左移动 */
  width: 10px;
}
.sec3.advantages .wh1200.items1 .item .item-content li:nth-child(1) {
  height: 66px;
  margin-bottom: 24px;
}
.sec3.advantages .wh1200.items1 .item .item-content li:nth-child(2) {
  height: 113px;
}
.sec3.advantages .wh1200.items1 .item .item-content .item-description {
  color: #333;
  font-size: 16px;
  line-height: 1.4;
}
.sec3.advantages .wh1200.items1 .item .item-content .item-description span {
  color: #004BE1;
}

/* ===== sec4.scenes .wh1200.items1 ===== */
.sec4.scenes .wh1200.items1 {
  display: flex;
  flex-direction: row;
  gap: 32px;
}
.sec4.scenes .wh1200.items1 .item {
  flex: 1;
  display: flex;
  flex-direction: row;
  background-color: white;
  align-items: center;
  height: 554px;
  border-radius: 16px;
  box-shadow: 0 4px 9px 3px rgba(0, 75, 225, 0.1);
}
.sec4.scenes .wh1200.items1 .item .left {
  display: flex;
  flex-direction: column;
  gap: 24px;
  margin-left: 95px;
}
.sec4.scenes .wh1200.items1 .item .left .item-title {
  width: 340px;
  height: 64px;
  box-shadow: 0 4px 8px 0 rgba(189, 211, 255, 0.25);
  font-size: 16px;
  line-height: 1.4;
  display: flex;
  justify-content: center;
  align-items: center;
  color: #333;
  border-radius: 10px;
  cursor: pointer;
}
.sec4.scenes .wh1200.items1 .item .left .active {
  color: #fff;
  background: #004BE1;
}
.sec4.scenes .wh1200.items1 .item .right {
  margin-left: 78px;
  position: relative;
}
.sec4.scenes .wh1200.items1 .item .right img {
  left: 0;
  position: absolute;
  opacity: 0;
  transition: opacity 0.3s ease-in-out;
}
.sec4.scenes .wh1200.items1 .item .right .active {
  opacity: 1;
  position: relative;
}