/* 首页应用图片轮播：scroll-snap 实现，无 JS 时仍可横向滑动浏览 */
.tdk-carousel {
  position: relative;
  max-width: 960px;
  margin: 1.2em auto;
}

.tdk-carousel-viewport {
  display: flex;
  overflow-x: auto;
  scroll-snap-type: x mandatory;
  scroll-behavior: smooth;
  border-radius: 0.4rem;
  scrollbar-width: none;
  box-shadow: 0 0.1rem 0.6rem rgba(0, 0, 0, 0.25);
}

.tdk-carousel-viewport::-webkit-scrollbar {
  display: none;
}

.tdk-carousel-viewport > * {
  position: relative;
  flex: 0 0 100%;
  scroll-snap-align: center;
  margin: 0;
}

/* 行业标签：取图片 alt 文本，由 JS 渲染为左上角胶囊 */
.tdk-carousel-caption {
  position: absolute;
  top: 0.8em;
  left: 0.8em;
  padding: 0.3em 0.9em;
  border-radius: 1em;
  background: rgba(0, 0, 0, 0.55);
  color: #fff;
  font-size: 0.8rem;
  font-weight: 500;
  letter-spacing: 0.02em;
  pointer-events: none;
}

.tdk-carousel-viewport img {
  display: block;
  width: 100%;
  aspect-ratio: 16 / 9;
  object-fit: cover;
}

.tdk-carousel-btn {
  position: absolute;
  top: 50%;
  transform: translateY(-50%);
  width: 2.2em;
  height: 2.2em;
  border: none;
  border-radius: 50%;
  background: rgba(0, 0, 0, 0.45);
  color: #fff;
  font-size: 0.9rem;
  line-height: 1;
  cursor: pointer;
  opacity: 0.75;
  transition: opacity 0.2s, background 0.2s;
}

.tdk-carousel-btn:hover {
  opacity: 1;
  background: rgba(0, 0, 0, 0.65);
}

.tdk-carousel-prev {
  left: 0.6em;
}

.tdk-carousel-next {
  right: 0.6em;
}

.tdk-carousel-dots {
  position: absolute;
  bottom: 0.7em;
  left: 50%;
  transform: translateX(-50%);
  display: flex;
  gap: 0.45em;
}

.tdk-carousel-dot {
  width: 0.6em;
  height: 0.6em;
  padding: 0;
  border: none;
  border-radius: 50%;
  background: rgba(255, 255, 255, 0.55);
  cursor: pointer;
  transition: background 0.2s;
}

.tdk-carousel-dot.active {
  background: #fff;
}

/* 首页 YouTube 视频卡片：与轮播同宽两列网格，视觉对齐 */
.tdk-videos {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 1em;
  max-width: 960px;
  margin: 1.2em auto;
}

.tdk-video-card {
  position: relative;
  display: block;
  border-radius: 0.4rem;
  overflow: hidden;
  box-shadow: 0 0.1rem 0.6rem rgba(0, 0, 0, 0.25);
  transition: transform 0.2s, box-shadow 0.2s;
}

.tdk-video-card:hover {
  transform: scale(1.02);
  box-shadow: 0 0.2rem 1rem rgba(0, 0, 0, 0.35);
}

.tdk-video-card img {
  display: block;
  width: 100%;
  aspect-ratio: 16 / 9;
  object-fit: cover;
  margin: 0;
}

.tdk-video-card::after {
  content: "▶";
  position: absolute;
  top: 50%;
  left: 50%;
  transform: translate(-50%, -50%);
  width: 2.6em;
  height: 2.6em;
  font-size: 1.1rem;
  line-height: 2.6em;
  text-align: center;
  border-radius: 50%;
  background: rgba(0, 0, 0, 0.55);
  color: #fff;
  pointer-events: none;
  transition: background 0.2s;
}

.tdk-video-card:hover::after {
  background: rgba(204, 24, 30, 0.9);
}

.tdk-video-card.bilibili:hover::after {
  background: rgba(0, 161, 214, 0.9);
}

@media (max-width: 600px) {
  .tdk-videos {
    grid-template-columns: 1fr;
  }
}