*{margin:0;padding:0;box-sizing:border-box;font-family:"微软雅黑",sans-serif;}
body{background:#f9fafb;color:#333;overflow-x:hidden;}

.mobile-search{
  display:none;
  padding:8px 15px 12px;
  background:#fff;
}
.mobile-search .search-box{
  display:flex;
  align-items:center;
  border:1px solid #e5e7eb;
  border-radius:12px;
  height:40px;
  overflow:hidden;
  width:100%;
}
.mobile-search .search-input{
  flex:1;
  border:none;
  outline:none;
  padding:0 14px;
  font-size:14px;
  background:#f9fafb;
}
.mobile-search .search-btn{
  background:#2563eb;
  color:#fff;
  border:none;
  padding:0 18px;
  height:100%;
  font-size:14px;
  cursor:pointer;
}

#homeSlider {
  display: block;
  position: relative;
  width: 100%;
  height: 70vh;
  overflow: hidden;
  margin: 0;
  background:#e8f0ff;
  border-radius: 0;
}
#homeSlider .slider-container {
  display: flex;
  height: 100%;
  transition: transform 0.6s cubic-bezier(0.25, 0.8, 0.25, 1);
  will-change: transform;
}
#homeSlider .slider-item {
  flex: 0 0 100%;
  height: 100%;
  position:relative;
}
#homeSlider .slider-item a.bg-link{
  display:block;
  width:100%;
  height:100%;
}
#homeSlider .slide-media {
  width: 100%;
  height: 100%;
  object-fit: cover;
  border-radius: inherit;
  display: block;
  transform: translateZ(0);
  will-change: transform;
}
#homeSlider .slider-item .mask-overlay{
  position:absolute;
  left:0;
  top:0;
  width:50%;
  height:100%;
  background:linear-gradient(90deg, rgba(0,0,0,0.52) 0%, rgba(0,0,0,0.15) 80%, transparent 100%);
  z-index:7;
  border-radius:inherit;
  display:none;
}
#homeSlider .slider-item.has-text .mask-overlay{
  display:block;
}
#homeSlider .slider-text-wrap{
  position:absolute;
  left:6%;
  top:50%;
  transform:translateY(-50%);
  color:#fff;
  z-index:8;
  max-width:580px;
  display:none;
}
#homeSlider .slider-item.has-text .slider-text-wrap{
  display:block;
}
#homeSlider .slider-tip{
  font-size:22px;
  margin-bottom:12px;
  opacity:0.98;
}
#homeSlider .slider-title{
  font-size:48px;
  line-height:1.2;
  font-weight:bold;
  margin-bottom:20px;
}
#homeSlider .slider-desc{
  font-size:17px;
  line-height:1.7;
  margin-bottom:36px;
  opacity:0.96;
}
#homeSlider .slider-buttons{
  display:flex;
  gap:20px;
  align-items:center;
}
#homeSlider .btn1{
  padding:14px 32px;
  background:#fff;
  color:#111;
  border:none;
  font-size:16px;
  cursor:pointer;
  text-decoration:none;
  transition:0.2s;
}
#homeSlider .btn1:hover{
  background:#f0f0f0;
}
#homeSlider .btn2{
  padding:13px 30px;
  background:transparent;
  color:#fff;
  border:1px solid #fff;
  font-size:16px;
  cursor:pointer;
  text-decoration:none;
  display:flex;
  align-items:center;
  gap:8px;
  transition:0.2s;
}
#homeSlider .btn2:hover{
  background:rgba(255,255,255,0.15);
}
#homeSlider .slider-arrow{
  position:absolute;
  top:50%;
  transform:translateY(-50%);
  width:44px;
  height:44px;
  background:rgba(0,0,0,0.35);
  backdrop-filter:blur(4px);
  border-radius:50%;
  display:flex;
  align-items:center;
  justify-content:center;
  cursor:pointer;
  z-index:9;
  transition:all 0.24s ease;
}
#homeSlider .slider-arrow:hover{
  background:rgba(0,0,0,0.6);
}
#homeSlider .slider-arrow svg{
  width:16px;
  height:16px;
  fill:#fff;
}
#homeSlider .prev{
  left:24px;
}
#homeSlider .next{
  right:24px;
}
#homeSlider .slider-dots {
  position: absolute;
  bottom: 20px;
  left: 0;
  width: 100%;
  text-align: center;
  z-index: 10;
}
#homeSlider .slider-dots span {
  display: inline-block;
  width: 12px;
  height: 12px;
  background: rgba(255,255,255,0.4);
  border-radius: 50%;
  margin: 0 6px;
  cursor: pointer;
  transition:all 0.2s;
}
#homeSlider .slider-dots span.active {
  background: #fff;
  width:24px;
  border-radius:6px;
}
/* 修复：按钮默认可见，仅非视频隐藏 */
#homeSlider .video-toggle{
  position:absolute;
  bottom:24px;
  right:24px;
  width:40px;
  height:40px;
  background:rgba(0,0,0,0.35);
  backdrop-filter:blur(4px);
  border-radius:50%;
  display:flex;
  align-items:center;
  justify-content:center;
  cursor:pointer;
  z-index:11;
  transition:all 0.24s ease;
  opacity:0;
  pointer-events:none;
}
#homeSlider .video-toggle.show{
  opacity:1;
  pointer-events:auto;
}
#homeSlider .video-toggle:hover{
  background:rgba(0,0,0,0.6);
}
#homeSlider .video-toggle svg{
  width:20px;
  height:20px;
  fill:#fff;
}

@media (max-width:1024px){
  #homeSlider .slider-text-wrap{
    max-width:480px;
  }
  #homeSlider .slider-title{
    font-size:38px;
  }
  #homeSlider .video-toggle{
    width:36px;
    height:36px;
    bottom:16px;
    right:16px;
  }
}
@media (max-width:768px){
  #homeSlider {
    width: 100%;
    height: 220px;
    overflow: hidden !important;
    padding: 0;
    margin:0;
    border-radius:0;
  }
  #homeSlider .slider-item .mask-overlay{
    width:65%;
    background:linear-gradient(90deg, rgba(0,0,0,0.58) 0%, rgba(0,0,0,0.2) 90%, transparent 100%);
  }
  #homeSlider .slider-container {
    gap:0;
    padding:0;
  }
  #homeSlider .slider-item {
    flex: 0 0 100%;
  }
  #homeSlider .slider-arrow{
    width:32px;
    height:32px;
  }
  #homeSlider .prev{
    left:12px;
  }
  #homeSlider .next{
    right:12px;
  }
  #homeSlider .slider-text-wrap{
    left:4%;
    max-width:92%;
  }
  #homeSlider .slider-tip{
    font-size:16px;
    margin-bottom:6px;
  }
  #homeSlider .slider-title{
    font-size:24px;
    margin-bottom:10px;
  }
  #homeSlider .slider-desc{
    font-size:13px;
    margin-bottom:18px;
    display:-webkit-box;
    -webkit-line-clamp:2;
    -webkit-box-orient:vertical;
    overflow:hidden;
  }
  #homeSlider .slider-buttons{
    gap:12px;
  }
  #homeSlider .btn1,#homeSlider .btn2{
    padding:8px 16px;
    font-size:13px;
  }
  #homeSlider .video-toggle{
    width:32px;
    height:32px;
    bottom:12px;
    right:12px;
  }
}

.feature-box{
    max-width:1200px;
    margin:30px auto 40px;
    padding:0 20px;
    display:grid;
    grid-template-columns:repeat(4,1fr);
    gap:20px;
}
.feature-item{
    background:#fff;
    border-radius:12px;
    padding:26px 30px;
    box-shadow:0 4px 20px rgba(0,0,0,0.06);
    display:flex;
    align-items:center;
    gap:18px;
    transition:0.2s;
}
.feature-item:hover{box-shadow:0 6px 24px rgba(0,0,0,0.1);}
.feature-icon{
    width:52px;
    height:52px;
    display:flex;
    align-items:center;
    justify-content:center;
    flex-shrink:0;
}
.feature-icon img{max-width:100%;max-height:100%;object-fit:contain;border-radius:6px;}
.feature-title{font-size:19px;font-weight:600;color:#111;}

.container{max-width:1200px;margin:0 auto;padding:20px;padding-top:0;}
.course-section{margin:0;}
.course-header{
    display:flex;
    justify-content:space-between;
    align-items:center;
    margin-bottom:20px;
}
.course-title-wrap{display:flex;align-items:center;gap:10px;}
.course-icon{width:32px;height:32px;display:flex;align-items:center;justify-content:center;color:#2563eb;font-size:24px;}
.course-title-main{font-size:26px;font-weight:bold;color:#1e293b;}
.course-title-sub{font-size:16px;color:#666;margin-left:10px;}
.course-more{color:#666;text-decoration:none;font-size:15px;display:flex;align-items:center;gap:5px;}
.course-more:hover{color:#2563eb;}

.course-list{
    display:grid;
    grid-template-columns:repeat(3,1fr);
    gap:24px;
}
.course-item{
    background:#fff;
    border-radius:16px;
    overflow:hidden;
    transition:0.3s;
    box-shadow:0 3px 15px rgba(0,0,0,0.04);
    text-decoration:none;
}
.course-item:hover{transform:translateY(-6px);box-shadow:0 12px 25px rgba(0,0,0,0.08);}
.course-item img{width:100%;height:200px;object-fit:cover;background:#f0f4f9;}
.course-info{padding:20px;}
.course-name{font-size:16px;margin-bottom:12px;line-height:1.4;color:#1e293b;}
.course-cate{display:none;}
.course-bottom{display:flex;justify-content:space-between;align-items:center;}
.course-left{display:flex;align-items:center;gap:8px;}
.course-tag{display:flex;align-items:center;gap:4px;color:#ff4d4f;font-size:14px;}
.course-price{font-weight:bold;font-size:17px;}
.course-price.free{color:#ff4d4f;}
.course-price.paid{color:#ff4d4f;}

.news-section{max-width:1200px;margin:0 auto 50px;padding:0 20px;}
.news-header{display:flex;align-items:center;gap:10px;font-size:22px;font-weight:bold;color:#1e293b;margin-bottom:20px;}
.news-header .icon{width:36px;height:36px;background:#0ea5e9;border-radius:6px;display:flex;align-items:center;justify-content:center;color:#fff;}
.news-wrap{background:#fff;border-radius:16px;box-shadow:0 4px 20px rgba(0,0,0,0.06);padding:24px;}
.news-list-full{list-style:none;margin:0;padding:0;}
.news-item-row{border-bottom:1px solid #f2f3f5;}
.news-item-row:last-child{border-bottom:none;}
.news-link{display:flex;justify-content:space-between;align-items:center;padding:14px 8px;text-decoration:none;color:#333;transition:0.2s;}
.news-link:hover{background:#f0f9ff;color:#0ea5e9;}
.news-title-text{flex:1;margin-right:20px;white-space:nowrap;overflow:hidden;text-overflow:ellipsis;}
.news-date-text{font-size:13px;color:#999;flex-shrink:0;}

.promo-section{max-width:1200px;margin:0 auto 50px;padding:0 20px;}
.promo-header{display:flex;align-items:center;gap:10px;font-size:22px;font-weight:bold;color:#1e293b;margin-bottom:20px;}
.promo-header .icon{width:36px;height:36px;background:#2563eb;border-radius:6px;display:flex;align-items:center;justify-content:center;color:#fff;}
.promo-wrap{display:flex;background:#fff;border-radius:16px;overflow:hidden;box-shadow:0 4px 20px rgba(0,0,0,0.06);}
.promo-left{width:220px;background:#fff;border-right:1px solid #eee;}
.promo-list{list-style:none;padding:0;margin:0;}
.promo-list li{padding:22px 30px;font-size:16px;color:#666;cursor:pointer;transition:all 0.2s ease;display:flex;justify-content:space-between;align-items:center;border-left:3px solid transparent;}
.promo-list li span{font-size:18px;color:#ccc;}
.promo-list li:hover,.promo-list li.active{background:#f8faff;color:#2563eb;font-weight:500;border-left-color:#2563eb;}
.promo-list li.active span{color:#2563eb;}
.promo-right{flex:1;display:flex;align-items:center;justify-content:center;padding:30px;}
.promo-img{max-width:100%;max-height:536px;object-fit:cover;border-radius:12px;display:none;background:#f0f4f9;}
.promo-img.active{display:block;}

@media (max-width:1024px){
    .course-list{grid-template-columns:repeat(2,1fr);}
    .promo-wrap{flex-direction:column;}
    .promo-left{width:100%;border-right:none;border-bottom:1px solid #eee;}
    .promo-list{display:flex;overflow-x:auto;gap:10px;padding:0 20px;}
    .promo-list li{padding:12px 20px;white-space:nowrap;border-radius:8px;background:#fff;border-left:none;}
    .promo-list li:hover,.promo-list li.active{border-left:none;}
    .promo-img{width:100%;height:auto;}
}

@media (max-width:768px){
    .mobile-search{display:block;}
    .feature-box{display:none;}
    .course-list{grid-template-columns:repeat(1,1fr);gap:12px;}
    .course-item{display:flex;border-radius:12px;}
    .course-item img{width:130px;height:auto;flex-shrink:0;}
    .course-info{flex:1;padding:14px 16px;display:flex;flex-direction:column;justify-content:center;}
    .course-name{font-size:17px;margin-bottom:6px;}
    .course-cate{display:block;font-size:14px;color:#666;margin-bottom:8px;}
    .course-bottom{justify-content:flex-start;}
    .course-tag{display:none;}
    .course-price{font-size:18px;}
    .container{padding:15px;padding-top:0;}
    .course-title-main{font-size:22px;}
    .course-section{margin:0;}
    .news-link{padding:12px 4px;}
    .news-title-text{font-size:14px;}
}