/* 视频案例 - 响应式容器 */
.video-cases {
  padding: clamp(40px, 5vh, 60px) 0;
  padding-bottom: clamp(60px, 7vh, 80px);
}
.video-cases .text-center {
  font-size: clamp(22px, 2.5vw, 28px);
  margin-bottom: clamp(25px, 3vh, 35px);
  font-weight: 500;
}

/* Tab切换 - 样图样式 - 响应式 */
.video-tabs {
  display: flex;
  justify-content: center;
  align-items: flex-end;
  margin-bottom: clamp(30px, 4vh, 45px);
}

.tab-nav {
  display: flex;
  justify-content: center;
  align-items: flex-end;
  position: relative;
  padding-bottom: 16px;
}

.tab-nav::after {
  content: '';
  position: absolute;
  bottom: 0;
  left: 0;
  width: 100%;
  height: 16px;
  background: url('../images/20260407/service/滑轨.png') no-repeat center bottom;
  background-size: 100% 100%;
  filter: grayscale(60%) opacity(25%);
  pointer-events: none;
}
.tab-item {
  padding: clamp(8px, 1vh, 12px) clamp(20px, 2.5vw, 30px) 0;
  font-size: clamp(15px, 1.5vw, 18px);
  cursor: pointer;
  position: relative;
  color: #666;
  transition: all 0.3s;
  margin: 0 clamp(8px, 1vw, 12px);
}
.tab-item:hover {
  color: #0276FE;
}
.tab-item.active {
  background: linear-gradient(to right, #0276FE, #0DB6FD);
  -webkit-background-clip: text;
  -webkit-text-fill-color: transparent;
  background-clip: text;
  font-weight: 600;
}

/* 动态滑动下划线 - 激活位置彩色曲线 */
.tab-slider {
  position: absolute;
  bottom: 0;
  left: 0;
  height: 14px;
  z-index: 1;
  background: url('../images/20260407/service/高亮段.png') no-repeat center bottom;
  background-size: 100% 100%;
  transition: left 0.35s cubic-bezier(0.4, 0, 0.2, 1), width 0.35s cubic-bezier(0.4, 0, 0.2, 1);
  pointer-events: none;
}

/* 视频网格 - 响应式容器 */
.video-grid {
  position: relative;
  max-width: 1200px;
  width: 100%;
  margin: 0 auto;
  padding: 0 clamp(15px, 2vw, 40px);
}
.video-panel {
  display: none;
}
.video-panel.active {
  display: grid !important;
  grid-template-columns: repeat(4, 1fr);
  gap: clamp(12px, 1.5vw, 20px);
}

/* 视频项 - 响应式 */
.video-item {
  position: relative;
  aspect-ratio: 9/14;
  background-color: #f0f0f0;
  border-radius: 4px;
  overflow: hidden;
  cursor: pointer;
  width: 100%;
}
.video-item::after {
  content: '';
  position: absolute;
  bottom: 0;
  left: 0;
  width: 100%;
  height: 50%;
  background: linear-gradient(to top, 
    rgba(0, 0, 0, 0.85) 0%, 
    rgba(0, 0, 0, 0.6) 40%, 
    rgba(0, 0, 0, 0.2) 70%,
    transparent 100%
  );
  pointer-events: none;
  z-index: 5;
  transition: opacity 0.3s;
}
.video-item.empty::after {
  display: none;
}
.video-item.playing::after {
  opacity: 0;
}
.video-item.empty {
  background-color: #f5f5f5;
  cursor: default;
}
.video-thumbnail {
  width: 100%;
  height: 100%;
  object-fit: cover;
  display: block;
}
/* 视频封面骨架屏占位（video 元素已移除，由 JS 生成封面后替换为 img） */
.video-cover-placeholder,
.video-item.empty .video-placeholder {
  position: absolute;
  top: 0;
  left: 0;
  width: 100%;
  height: 100%;
  background: linear-gradient(135deg, #f5f5f5 0%, #e0e0e0 100%);
}
/* 视频加载中骨架屏动画 — 在封面就绪前显示 */
.video-item:not(.empty):not(.cover-ready)::before {
  content: '';
  position: absolute;
  inset: 0;
  z-index: 1;
  background: linear-gradient(90deg, #eee 25%, #f5f5f5 50%, #eee 75%);
  background-size: 200% 100%;
  animation: videoShimmer 1.8s ease-in-out infinite;
  border-radius: 4px;
  pointer-events: none;
}
@keyframes videoShimmer {
  0% { background-position: 200% 0; }
  100% { background-position: -200% 0; }
}

/* 视频封面图（由 generateThumbnail 动态插入） */
.video-cover-img {
  position: absolute;
  top: 0;
  left: 0;
  width: 100%;
  height: 100%;
  object-fit: cover;
  z-index: 1;
  pointer-events: none;
}

/* 视频遮罩层 */
.video-overlay {
  position: absolute;
  top: 0;
  left: 0;
  width: 100%;
  height: 100%;
  background-color: rgba(0, 0, 0, 0.2);
  box-shadow: inset 0 0 30px rgba(0, 0, 0, 0.3);
  display: flex;
  justify-content: center;
  transition: opacity 0.3s;
  z-index: 6;
}
.video-overlay.hide {
  opacity: 0;
  pointer-events: none;
}

/* 播放图标 - 响应式 */
.play-icon {
  width: clamp(36px, 4vw, 48px);
  height: clamp(36px, 4vw, 48px);
  border: 2px solid #fff;
  border-radius: 50%;
  position: relative;
  background-color: rgba(0, 0, 0, 0.3);
}
.play-icon::after {
  content: '';
  position: absolute;
  top: 50%;
  left: 55%;
  transform: translate(-50%, -50%);
  width: 0;
  height: 0;
  border-left: clamp(12px, 1.3vw, 16px) solid #fff;
  border-top: clamp(7px, 0.8vw, 10px) solid transparent;
  border-bottom: clamp(7px, 0.8vw, 10px) solid transparent;
}

/* 视频文字 - 响应式 */
.video-text {
  position: absolute;
  bottom: clamp(10px, 1.2vh, 15px);
  left: clamp(10px, 1.2vw, 15px);
  color: #fff;
  font-size: clamp(13px, 1.4vw, 16px);
  font-weight: 500;
  text-shadow: 0 1px 4px rgba(0, 0, 0, 0.6);
  transition: opacity 0.3s;
  z-index: 10;
  white-space: nowrap;
  opacity: 1;
}
.video-text.hide {
  opacity: 0;
}

/* 响应式 - 移动端 */
@media (max-width: 768px) {
  .video-panel.active {
    grid-template-columns: repeat(2, 1fr);
    gap: 10px;
  }
  .tab-item {
    padding: 6px 12px 0;
    font-size: 12px;
    margin: 0 8px;
  }
}

/* 响应式 - 平板端 */
@media screen and (max-width: 1024px) {
  .video-grid {
    max-width: 900px;
  }
  
  .video-panel.active {
    grid-template-columns: repeat(3, 1fr);
    gap: 15px;
  }
}

/* 向下适配 1025-1399px - 等比例缩小 */
@media screen and (max-width: 1399px) and (min-width: 1025px) {
  .video-grid {
    max-width: 1000px;
  }
  .video-panel.active {
    grid-template-columns: repeat(4, 1fr);
    gap: clamp(10px, 1.2vw, 16px);
  }
  .video-text {
    font-size: clamp(11px, 1.1vw, 13px);
    bottom: clamp(8px, 1vh, 12px);
    left: clamp(8px, 1vw, 12px);
  }
  .play-icon {
    width: clamp(30px, 3.5vw, 40px);
    height: clamp(30px, 3.5vw, 40px);
  }
  .play-icon::after {
    border-left: clamp(10px, 1.1vw, 14px) solid #fff;
    border-top: clamp(6px, 0.7vw, 8px) solid transparent;
    border-bottom: clamp(6px, 0.7vw, 8px) solid transparent;
  }
  .tab-item {
    padding: clamp(6px, 0.8vh, 10px) clamp(15px, 2vw, 22px) 0;
    font-size: clamp(13px, 1.3vw, 15px);
  }
  .video-cases {
    padding: clamp(30px, 4vh, 45px) 0;
    padding-bottom: clamp(45px, 5vh, 60px);
  }
  .video-tabs {
    margin-bottom: clamp(20px, 3vh, 35px);
  }
}

/* 大屏适配 (1400px+) */
@media (min-width: 1400px) and (max-width: 1919px) {
  .video-grid {
    max-width: 1400px;
  }
  
  .video-panel.active {
    grid-template-columns: repeat(4, 1fr);
    gap: clamp(15px, 1.8vw, 25px);
  }
}

/* 超大屏幕适配 (1920px+) */
@media (min-width: 1920px) {
  .video-grid {
    max-width: 1600px;
  }
  
  .video-panel.active {
    grid-template-columns: repeat(4, 1fr);
    gap: clamp(18px, 2vw, 30px);
  }
  
  .play-icon {
    width: clamp(42px, 4.5vw, 52px);
    height: clamp(42px, 4.5vw, 52px);
  }
  
  .play-icon::after {
    border-left: clamp(14px, 1.5vw, 18px) solid #fff;
    border-top: clamp(8px, 0.9vw, 11px) solid transparent;
    border-bottom: clamp(8px, 0.9vw, 11px) solid transparent;
  }
  
  .video-text {
    font-size: clamp(15px, 1.6vw, 18px);
    bottom: clamp(12px, 1.4vh, 18px);
    left: clamp(12px, 1.4vw, 18px);
  }
}

/* 2K/4K 超宽屏适配 (2560px+) */
@media (min-width: 2560px) {
  .video-grid {
    max-width: 1800px;
  }
  
  .video-panel.active {
    grid-template-columns: repeat(4, 1fr);
    gap: clamp(20px, 2.2vw, 35px);
  }
  
  .play-icon {
    width: clamp(48px, 5vw, 60px);
    height: clamp(48px, 5vw, 60px);
  }
  
  .play-icon::after {
    border-left: clamp(16px, 1.7vw, 20px) solid #fff;
    border-top: clamp(9px, 1vw, 12px) solid transparent;
    border-bottom: clamp(9px, 1vw, 12px) solid transparent;
  }
  
  .video-text {
    font-size: clamp(16px, 1.8vw, 20px);
    bottom: clamp(14px, 1.6vh, 20px);
    left: clamp(14px, 1.6vw, 20px);
  }
  
  .tab-item {
    padding: clamp(10px, 1.2vh, 14px) clamp(25px, 3vw, 35px) 0;
    font-size: clamp(17px, 1.7vw, 20px);
  }
}