/* ── Grid ── */
.articles-grid {
  display: grid;
  grid-template-columns: 1fr;
  gap: var(--sp-6);
}
@media (min-width: 640px)  { .articles-grid { grid-template-columns: repeat(2, 1fr); } }
@media (min-width: 1024px) { .articles-grid { grid-template-columns: repeat(3, 1fr); } }

/* ── Card ── */
.article-card {
  background: var(--bg-surface);
  border: 1px solid var(--border);
  border-radius: var(--r-lg);
  overflow: hidden;
  display: flex; flex-direction: column;
  transition: box-shadow var(--transition), border-color var(--transition);
  cursor: pointer;
}
.article-card:hover {
  box-shadow: var(--shadow-lg);
  border-color: var(--border-strong);
}

/* ── Zona de previsualización ── */
.card-preview {
  position: relative;
  width: 100%;
  height: 200px;
  overflow: hidden;
  background: var(--gray-100);
  border-bottom: 1px solid var(--border);
  flex-shrink: 0;
  display: block;
}
.card-preview iframe {
  position: absolute;
  top: 0; left: 0;
  width: 1200px;
  height: 900px;
  border: none;
  transform: scale(0.25);
  transform-origin: top left;
  pointer-events: none;
}
.card-preview-overlay {
  position: absolute;
  inset: 0;
  z-index: 2;
  background: transparent;
}

/* ── Contenido textual ── */
.card-body {
  padding: var(--sp-5);
  display: flex; flex-direction: column; flex: 1;
}
.card-chips {
  display: flex; flex-wrap: wrap; gap: var(--sp-2);
  margin-bottom: var(--sp-3);
}
.card-title {
  font-size: var(--text-base);
  font-weight: var(--fw-semibold);
  line-height: 1.4;
  margin-bottom: var(--sp-2);
  display: -webkit-box;
  -webkit-line-clamp: 3;
  -webkit-box-orient: vertical;
  overflow: hidden;
}
.card-title a { color: var(--text-primary); }
.card-title a:hover { color: var(--gray-600); text-decoration: none; }

.card-desc {
  font-size: var(--text-sm);
  color: var(--text-secondary);
  line-height: 1.5;
  margin-bottom: var(--sp-4);
  flex: 1;
  display: -webkit-box;
  -webkit-line-clamp: 3;
  -webkit-box-orient: vertical;
  overflow: hidden;
}
.card-meta {
  display: flex; gap: var(--sp-3); align-items: center;
  font-size: var(--text-xs);
  color: var(--text-muted);
  margin-top: auto;
  padding-top: var(--sp-4);
  border-top: 1px solid var(--border);
}
.card-read-link {
  margin-left: auto;
  font-size: var(--text-xs);
  font-weight: var(--fw-semibold);
  color: var(--text-secondary);
}
.card-read-link:hover { color: var(--text-primary); text-decoration: none; }