/* 三类广告位共用语义结构，主题通过色板与圆角变量整合视觉，不占据固定浮层。 */
.home-rail,
.article-rail {
  min-width: 0;
  display: grid;
  align-content: start;
  gap: 28px;
}
.article-rail .toc {
  position: static;
  max-height: 50vh;
}
.ad-slot {
  display: grid;
  gap: 16px;
  min-width: 0;
}
.ad-card {
  position: relative;
  display: block;
  overflow: hidden;
  min-width: 0;
  border: 1px solid var(--line);
  border-radius: var(--radius, 8px);
  background: var(--surface);
  color: var(--text);
  transition:
    border-color 0.2s ease,
    transform 0.2s ease;
}
.ad-card:hover {
  border-color: var(--accent);
  color: var(--text);
  transform: translateY(-2px);
}
.ad-badge {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 12px;
  padding: 5px 12px;
  font-size: 10px;
  letter-spacing: 1px;
  color: var(--muted);
  border-bottom: 1px solid var(--line);
}
.ad-image {
  display: block;
  width: 100%;
  max-height: 360px;
  object-fit: contain;
  margin: 0;
}
.ad-copy {
  padding: 16px 18px;
  overflow-wrap: anywhere;
  font-size: 14px;
  line-height: 1.8;
}
.ad-copy > :first-child {
  margin-top: 0;
}
.ad-copy > :last-child {
  margin-bottom: 0;
}
.ad-copy h2,
.ad-copy h3,
.ad-copy h4 {
  font-size: 1.12em;
  line-height: 1.5;
}
.ad-copy pre,
.ad-copy table {
  display: block;
  max-width: 100%;
  overflow: auto;
  font-size: 12px;
}
.ad-copy ul,
.ad-copy ol {
  padding-left: 1.4em;
}
.ad-copy img {
  max-width: 100%;
  height: auto;
}
.ad-slot-wide {
  margin: 0 0 28px;
}
.ad-slot-wide .ad-image {
  max-height: 260px;
}
.ad-slot-wide .ad-card-mixed {
  display: grid;
  grid-template-columns: minmax(0, 1fr) minmax(0, 1fr);
  align-items: center;
}
.ad-slot-wide .ad-card-mixed .ad-badge {
  grid-column: 1 / -1;
}
@media (max-width: 980px) {
  .article-rail {
    margin-top: 28px;
  }
  .article-rail .ad-slot {
    grid-template-columns: repeat(2, minmax(0, 1fr));
  }
}
@media (max-width: 760px) {
  .home-rail {
    margin-top: 28px;
    gap: 0;
  }
  .home-rail .home-sidebar {
    display: none;
  }
  .ad-slot-wide .ad-card-mixed {
    display: block;
  }
  .article-rail .ad-slot {
    grid-template-columns: minmax(0, 1fr);
  }
  .ad-slot:empty {
    display: none;
  }
}
@media (prefers-reduced-motion: reduce) {
  .ad-card {
    transition: none;
  }
  .ad-card:hover {
    transform: none;
  }
}