/**
 * 专题页底部「云耕智库最新文章」平铺栅格
 * 用于 topics / aigeo / areas 等含 TOPIC-BLOG-FEED-AUTO 的页面（与 hub-page.css 解耦）
 */
.topic-feed-section {
  background: var(--cream, #f8f3ea);
  border-top: 1px solid var(--card-border, rgba(26, 24, 20, 0.08));
  padding: clamp(2.5rem, 6vw, 4rem) 1.25rem;
}
.topic-feed-inner {
  max-width: 1160px;
  margin: 0 auto;
}
.topic-feed-head {
  text-align: center;
  margin-bottom: 2rem;
}
.topic-feed-tag {
  display: inline-block;
  margin: 0 0 0.75rem;
  padding: 0.3rem 0.85rem;
  font-size: 0.78rem;
  font-weight: 700;
  letter-spacing: 0.08em;
  color: var(--gold, #b8882a);
  background: rgba(184, 136, 42, 0.1);
  border-radius: 999px;
}
.topic-feed-title {
  margin: 0 0 0.5rem;
  font-size: clamp(1.4rem, 3vw, 2rem);
  line-height: 1.3;
  color: var(--ink, #2a2118);
}
.topic-feed-lede {
  margin: 0;
  color: var(--muted, #6b6155);
  font-size: 0.98rem;
}
.topic-feed-grid {
  display: grid;
  grid-template-columns: repeat(auto-fill, minmax(min(100%, 17rem), 1fr));
  gap: 1.25rem;
}
.topic-feed-card {
  display: flex;
  flex-direction: column;
  gap: 0.55rem;
  padding: 1.2rem 1.15rem;
  background: #fff;
  border: 1px solid var(--border, #e7ded0);
  border-radius: 16px;
  box-shadow: 0 12px 32px -18px rgba(40, 28, 12, 0.25);
  transition: transform 0.25s ease, box-shadow 0.25s ease, border-color 0.25s ease;
}
.topic-feed-card:hover {
  transform: translateY(-4px);
  box-shadow: 0 20px 44px -18px rgba(40, 28, 12, 0.32);
  border-color: rgba(201, 154, 46, 0.28);
}
.topic-feed-card__cover {
  display: block;
  margin: -1.2rem -1.15rem 0.45rem;
  aspect-ratio: 16 / 9;
  overflow: hidden;
  border-radius: 16px 16px 0 0;
  background: linear-gradient(135deg, rgba(201, 154, 46, 0.14), rgba(20, 184, 122, 0.1));
}
.topic-feed-card__cover-img {
  display: block;
  width: 100%;
  height: 100%;
  object-fit: cover;
  transition: transform 0.45s cubic-bezier(0.23, 1, 0.32, 1);
}
.topic-feed-card:hover .topic-feed-card__cover-img {
  transform: scale(1.045);
}
.topic-feed-card__cover--placeholder {
  display: flex;
  align-items: center;
  justify-content: center;
  text-align: center;
  padding: 0.75rem;
}
.topic-feed-card__cover-label {
  font-weight: 700;
  letter-spacing: 0.06em;
  color: var(--gold-deep, #8a6418);
}
.topic-feed-card__meta {
  margin: 0;
  font-size: 0.72rem;
  letter-spacing: 0.05em;
  text-transform: uppercase;
  color: var(--muted, #6b6155);
}
.topic-feed-card__title {
  margin: 0;
  font-size: 1rem;
  font-weight: 700;
  line-height: 1.45;
}
.topic-feed-card__title a {
  color: var(--ink, #2a2118);
  text-decoration: none;
}
.topic-feed-card__title a:hover,
.topic-feed-card__title a:focus-visible {
  color: var(--gold, #b8882a);
  outline: none;
}
.topic-feed-card__desc {
  flex: 1 1 auto;
  margin: 0;
  font-size: 0.88rem;
  line-height: 1.6;
  color: var(--text2, #555);
}
.topic-feed-card__link {
  font-weight: 600;
  color: var(--terracotta, #b8552a);
  text-decoration: none;
}
.topic-feed-card__link:hover,
.topic-feed-card__link:focus-visible {
  text-decoration: underline;
  text-underline-offset: 3px;
}
.topic-feed-more {
  margin: 1.75rem 0 0;
  text-align: center;
}

@media (max-width: 640px) {
  .topic-feed-grid {
    grid-template-columns: 1fr;
  }
}

@media (prefers-reduced-motion: reduce) {
  .topic-feed-card:hover {
    transform: none;
  }
  .topic-feed-card:hover .topic-feed-card__cover-img {
    transform: none;
  }
}