/*
 * 文章图片轮播
 * 在轮播容器上设置 --carousel-ratio 可改变图片区域比例，例如：
 * style="--carousel-ratio: 4 / 3;"
 */
.article-carousel {
  --carousel-ratio: 16 / 9;
  --carousel-accent: var(--theme-color, #49b1f5);
  --carousel-surface: var(--card-bg, #fff);
  --carousel-media-bg: rgba(0, 0, 0, 0.045);
  position: relative;
  width: 100%;
  margin: 1.5rem 0;
  overflow: hidden;
  border: 1px solid rgba(127, 127, 127, 0.18);
  border-radius: 12px;
  background: var(--carousel-surface);
  box-shadow: 0 6px 18px rgba(0, 0, 0, 0.08);
}

.article-carousel:focus-visible {
  outline: 3px solid var(--carousel-accent);
  outline-offset: 3px;
}

.article-carousel__track,
.article-carousel__track > figure {
  margin: 0 !important;
}

.article-carousel__track {
  position: relative;
}

/* JS 尚未加载时依旧展示全部内容，不会让图片不可见。 */
.article-carousel:not([data-carousel-ready]) .article-carousel__track > figure + figure {
  margin-top: 1rem !important;
}

.article-carousel[data-carousel-ready] .article-carousel__track > figure[hidden] {
  display: none !important;
}

.article-carousel[data-carousel-ready] .article-carousel__track > figure:not([hidden]) {
  display: block;
  animation: article-carousel-fade 220ms ease-out;
}

.article-carousel__track > figure > img {
  display: block;
  width: 100%;
  max-width: none !important;
  aspect-ratio: var(--carousel-ratio);
  margin: 0 !important;
  border: 0;
  border-radius: 0 !important;
  background: var(--carousel-media-bg);
  object-fit: contain;
  user-select: none;
  -webkit-user-drag: none;
}

.article-carousel__track > figure > figcaption {
  min-height: 2.75rem;
  padding: 0.65rem 1rem;
  color: var(--font-color, #4c4948);
  font-size: 0.9rem;
  line-height: 1.5;
  text-align: center;
}

.article-carousel button.article-carousel__arrow {
  position: absolute;
  top: 50%;
  z-index: 2;
  display: grid;
  width: 2.6rem;
  height: 2.6rem;
  padding: 0;
  border: 0;
  border-radius: 50%;
  color: #fff;
  background: rgba(0, 0, 0, 0.48);
  box-shadow: 0 2px 8px rgba(0, 0, 0, 0.2);
  font: inherit;
  font-size: 2rem;
  line-height: 1;
  cursor: pointer;
  opacity: 0.86;
  transform: translateY(-50%);
  transition: background 160ms ease, opacity 160ms ease, transform 160ms ease;
  place-items: center;
}

.article-carousel button.article-carousel__arrow:hover {
  background: var(--carousel-accent);
  opacity: 1;
  transform: translateY(-50%) scale(1.06);
}

.article-carousel button.article-carousel__arrow:focus-visible,
.article-carousel button.article-carousel__dot:focus-visible {
  outline: 3px solid var(--carousel-accent);
  outline-offset: 2px;
}

.article-carousel__arrow--previous {
  left: 0.8rem;
}

.article-carousel__arrow--next {
  right: 0.8rem;
}

.article-carousel__footer {
  position: relative;
  display: flex;
  align-items: center;
  justify-content: center;
  min-height: 2.35rem;
  padding: 0.45rem 0.8rem;
  border-top: 1px solid rgba(127, 127, 127, 0.12);
}

.article-carousel__dots {
  display: flex;
  align-items: center;
  justify-content: center;
  gap: 0.48rem;
}

.article-carousel button.article-carousel__dot {
  width: 0.62rem;
  height: 0.62rem;
  padding: 0;
  border: 0;
  border-radius: 50%;
  background: rgba(127, 127, 127, 0.42);
  cursor: pointer;
  transition: background 160ms ease, transform 160ms ease;
}

.article-carousel button.article-carousel__dot[aria-current="true"] {
  background: var(--carousel-accent);
  transform: scale(1.28);
}

.article-carousel__status {
  position: absolute;
  right: 0.9rem;
  padding: 0.12rem 0.5rem;
  border-radius: 999px;
  color: var(--font-color, #4c4948);
  background: rgba(127, 127, 127, 0.12);
  font-size: 0.78rem;
  font-variant-numeric: tabular-nums;
}

html[data-theme="dark"] .article-carousel {
  --carousel-media-bg: rgba(255, 255, 255, 0.04);
  border-color: rgba(255, 255, 255, 0.12);
  box-shadow: 0 6px 18px rgba(0, 0, 0, 0.28);
}

@keyframes article-carousel-fade {
  from {
    opacity: 0.35;
  }
  to {
    opacity: 1;
  }
}

@media (max-width: 600px) {
  .article-carousel__track > figure > figcaption {
    min-height: 2.5rem;
    padding: 0.55rem 0.75rem;
    font-size: 0.82rem;
  }

  .article-carousel button.article-carousel__arrow {
    width: 2.2rem;
    height: 2.2rem;
    font-size: 1.65rem;
  }

  .article-carousel__arrow--previous {
    left: 0.45rem;
  }

  .article-carousel__arrow--next {
    right: 0.45rem;
  }

  .article-carousel__status {
    right: 0.55rem;
  }
}

@media (prefers-reduced-motion: reduce) {
  .article-carousel[data-carousel-ready] .article-carousel__track > figure:not([hidden]) {
    animation: none;
  }

  .article-carousel button.article-carousel__arrow,
  .article-carousel button.article-carousel__dot {
    transition: none;
  }
}