body {
  margin: 0;
  padding: 0;
  font-family: "Microsoft YaHei", sans-serif;
  background: #fff;
}

.w1 {
  background: url(b0.jpg) no-repeat 0 0;
}


.top-banner {
  padding: 60px 0 20px;
  text-align: center;
}
.top-banner img{
  max-width: 100%;
}
@media screen and (max-width: 768px) {
  .top-banner {
    padding: 0px;
  }
}

.main-wrapper {
  width: 100%;
  background: url(b1.png) no-repeat center 0;
  min-height: 1746px;
  padding: 20px 0;
}
@media screen and (max-width: 768px) {
  .main-wrapper {
    padding: 0px;
    background: none;
    min-height: auto;
    background-color: #eaf2fe;
  }
}
main {
  max-width: 1200px;
  margin: 0 auto;
  padding: 20px;
}

.lecture-content {
  padding: 40px 20px;
}
@media screen and (max-width: 768px) {
  .lecture-content {
    padding: 0px;
  }
}
.lecture-title {
  font-size: 50px;
  color: #0b92da;
  text-align: center;
  margin-bottom: 40px;
  font-weight: bold;
}
@media screen and (max-width: 768px) {
  .lecture-title {
    font-size: 24px;
  }
}
.lecture-image {
  text-align: center;
  margin-bottom: 20px;
}

.lecture-description {
  padding: 30px 0;
  position: relative;
}

.lecture-description::after {
  content: "";
  display: block;
  width: 100%;
  height: 2px;
  background-color: #eaf2fe;
  position: absolute;
  bottom: -25px;
  left: 0;
}

.lecture-description p {
  font-size: 16px;
  line-height: 1.8;
  color: #333;
  text-align: justify;
  margin: 0;

}
.lecture-description img{
  display: none;
}
.main-image {
  max-width: 100%;
  height: auto;
  border-radius: 8px;
  box-shadow: 0 4px 8px rgba(0, 0, 0, 0.1);
}

.main-video {
  max-width: 100%;
  height: auto;
  border-radius: 8px;
  box-shadow: 0 4px 8px rgba(0, 0, 0, 0.1);
  background-color: #000;
  cursor: pointer;
  position: relative;
  z-index: 10; /* 确保视频在最上层 */
}

.lecture-image {
  position: relative;
  text-align: center;
  margin-bottom: 20px;
  z-index: 5;
}

.play-button {
  position: absolute;
  top: 50%;
  left: 50%;
  transform: translate(-50%, -50%);
  cursor: pointer;
  z-index: 20;
  opacity: 0.9; /* 增加默认不透明度 */
  transition: opacity 0.3s ease, transform 0.3s ease;
  /* 添加阴影效果 */
  filter: drop-shadow(0px 0px 5px rgba(0, 0, 0, 0.5));
}

.play-button:hover {
  opacity: 1;
  transform: translate(-50%, -50%) scale(1.1);
}

.play-button.hidden {
  display: none;
}



.lecture-gallery {
  margin-top: 70px;
}
@media screen and (max-width: 768px) {
  .lecture-gallery {
    margin-top: 0px;
  }
}
.gallery-navigation {
  display: flex;
  align-items: center;
  justify-content: space-between;
  margin: 20px 0;
  position: relative;
}

.nav-button {
  cursor: pointer;
  z-index: 10;
  position: relative;
  top: -20px; /* 向上移动20px */
}

.nav-button img {
  width: 100%;
  height: auto;
}

.swiper-background {
  flex: 1;
  margin: 0 20px;
  padding-top: 30px;
  overflow: hidden;
}

.swiper-container {
  width: 100%;
  padding: 10px 0;
}

.swiper-slide {
  text-align: center;
  display: flex;
  justify-content: center;
}

.gallery-item {
  width: 265px;
  text-align: center;
  cursor: pointer;
  transition: transform 0.3s ease, box-shadow 0.3s ease;
}

.gallery-item:hover {
  /* transform: scale(1.05); */
}

.gallery-item.active {
  transform: translateY(-5px);
}

.gallery-item.active img {

  border: 2px solid #0b92da;
}

.gallery-item.active p {
  color: #0b92da;
  font-weight: bold;
}

.gallery-item img {
  width: 100%;
  max-width: 265px;
  height: auto;
  border-radius: 8px;
  box-shadow: 0 2px 4px rgba(0, 0, 0, 0.1);
}

.gallery-item p {
  margin-top: 10px;
  font-size: 16px;
  color: #333;
  text-align: left;
}

@media screen and (max-width: 768px) {
  .gallery-item img {
    max-width: 240px;
  }
  
  .nav-button {
    flex: 0 0 30px;
  }

}<!--ecms sync check [sync_thread_id="3bcee7cc5a424330844ab778a62d31c1" sync_date="2025-10-09 15:01:11" check_sum="3bcee7cc5a424330844ab778a62d31c1]-->