/* ═══════════════════════════════════════════════════════════════
   CARDS — article card styles used on homepage and articles page
   ═══════════════════════════════════════════════════════════════ */

/* ── Legacy article grid (site.css art-card) ────────────────── */
.article-grid {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 24px;
}

@media (max-width: 1024px) {
  .article-grid { grid-template-columns: repeat(2, 1fr); }
}

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

.art-card {
  display: flex;
  flex-direction: column;
  background: var(--color-white);
  border: 1px solid var(--border);
  border-radius: var(--border-radius-md);
  overflow: hidden;
  text-decoration: none;
  color: inherit;
  transition: transform 0.22s ease, box-shadow 0.22s ease, border-color 0.22s;
  box-shadow: var(--shadow-card);
}

.art-card:hover {
  transform: translateY(-4px);
  box-shadow: var(--shadow-card-hover);
  border-color: rgba(220,20,60,0.2);
}

.art-card__cover-wrap {
  width: 100%;
  height: 200px;
  overflow: hidden;
  flex-shrink: 0;
  background: linear-gradient(135deg, var(--color-light-pink) 0%, var(--color-cream) 100%);
}

.art-card__cover {
  width: 100%;
  height: 100%;
  object-fit: cover;
  display: block;
  transition: transform 0.3s ease;
}

.art-card:hover .art-card__cover { transform: scale(1.03); }

.art-card__cover-placeholder {
  width: 100%;
  height: 100%;
  background: linear-gradient(135deg, var(--color-light-pink) 0%, var(--color-cream) 60%, rgba(247,82,112,0.15) 100%);
  display: flex;
  align-items: center;
  justify-content: center;
}

.art-card__cover-placeholder svg {
  width: 44px; height: 44px;
  color: var(--color-primary);
  opacity: 0.4;
}

.art-card__body {
  padding: 20px;
  flex: 1;
  display: flex;
  flex-direction: column;
  gap: 8px;
}

.art-card__title {
  font-size: 1.05rem;
  font-weight: 700;
  color: var(--color-slate-900);
  line-height: 1.35;
  margin: 0;
  transition: color var(--transition-fast);
}

.art-card:hover .art-card__title { color: var(--color-primary); }

.art-card__excerpt {
  font-size: 0.88rem;
  color: var(--color-slate-700);
  line-height: 1.65;
  margin: 0;
  flex: 1;
  display: -webkit-box;
  -webkit-box-orient: vertical;
  -webkit-line-clamp: 3;
  overflow: hidden;
}

.art-card__meta {
  display: flex;
  align-items: center;
  gap: 14px;
  margin-top: 12px;
  padding-top: 12px;
  border-top: 1px solid var(--border);
  color: var(--color-slate-400);
  font-size: 0.78rem;
  flex-wrap: wrap;
}

.art-card__meta-item {
  display: flex;
  align-items: center;
  gap: 4px;
}

.art-card__meta-item svg { width: 13px; height: 13px; flex-shrink: 0; }

/* ── New article cards (homepage writings section) ──────────── */
.topics-section {
  background: var(--color-white);
  border-bottom: 1px solid rgba(247,202,201,0.2);
  padding: 64px 0;
}

.topics-container {
  max-width: var(--container-max);
  margin: 0 auto;
  padding: 0 32px;
}

@media (max-width: 768px) { .topics-container { padding: 0 16px; } }

.topics-grid {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 32px;
}

@media (max-width: 768px) {
  .topics-grid { grid-template-columns: 1fr; }
}

.topic-card {
  display: flex;
  flex-direction: column;
  align-items: center;
  text-align: center;
  padding: 24px;
  border-radius: var(--border-radius-lg);
  transition: background var(--transition-fast);
  cursor: default;
}

.topic-card:hover { background: var(--color-slate-50); }

.topic-icon {
  width: 56px; height: 56px;
  border-radius: var(--border-radius-lg);
  display: grid;
  place-items: center;
  margin: 0 auto 16px;
}

.topic-icon svg { width: 28px; height: 28px; color: var(--color-primary); }

.topic-icon--datasci { background: rgba(253,235,208,0.5); }
.topic-icon--bio { background: rgba(247,202,201,0.3); }
.topic-icon--algo { background: rgba(247,82,112,0.1); }

.topic-card h3 {
  font-size: 20px;
  font-weight: 700;
  color: var(--color-slate-900);
  margin: 0 0 8px;
}

.topic-card p {
  font-size: 16px;
  font-weight: 300;
  color: var(--color-slate-600);
  margin: 0;
  line-height: 1.6;
}

/* Writings section */
.writings-section {
  background: var(--color-background);
  padding: 96px 0;
}

.writings-container {
  max-width: var(--container-max);
  margin: 0 auto;
  padding: 0 32px;
}

@media (max-width: 768px) { .writings-container { padding: 0 16px; } }

.writings-header {
  display: flex;
  align-items: center;
  gap: 12px;
  margin-bottom: 48px;
}

.writings-header svg { width: 32px; height: 32px; color: var(--color-primary); flex-shrink: 0; }

.writings-header h2 {
  font-size: 30px;
  font-weight: 700;
  color: var(--color-slate-900);
  margin: 0;
  line-height: 1.2;
}

/* New article grid */
.new-article-grid {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 32px;
}

@media (max-width: 1024px) { .new-article-grid { grid-template-columns: repeat(2, 1fr); } }
@media (max-width: 640px) { .new-article-grid { grid-template-columns: 1fr; } }

/* New article card */
.new-art-card {
  background: var(--color-white);
  border: 1px solid var(--color-slate-200);
  border-radius: var(--border-radius-xl);
  overflow: hidden;
  box-shadow: var(--shadow-sm);
  transition: all var(--transition-normal) ease;
  display: flex;
  flex-direction: column;
  text-decoration: none;
  color: inherit;
  opacity: 0;
  transform: translateY(20px);
}

.new-art-card.is-visible {
  opacity: 1;
  transform: translateY(0);
  transition: opacity 500ms ease-out, transform 500ms ease-out, box-shadow var(--transition-normal), border-color var(--transition-normal);
}

.new-art-card:hover {
  box-shadow: var(--shadow-pink);
  border-color: var(--color-light-pink);
}

.new-art-card__img-wrap {
  position: relative;
  width: 100%;
  aspect-ratio: 16 / 10;
  background: #f1f5f9;
  overflow: hidden;
  flex-shrink: 0;
}

.new-art-card__img {
  width: 100%; height: 100%;
  object-fit: cover;
  display: block;
  transition: transform 700ms ease;
}

.new-art-card:hover .new-art-card__img { transform: scale(1.05); }

.new-art-card__img-overlay {
  position: absolute;
  inset: 0;
  background: rgba(0,0,0,0.05);
  transition: background var(--transition-normal);
  pointer-events: none;
}

.new-art-card:hover .new-art-card__img-overlay { background: transparent; }

.new-art-card__placeholder {
  width: 100%; height: 100%;
  background: linear-gradient(135deg, var(--color-light-pink) 0%, var(--color-cream) 100%);
  display: flex;
  align-items: center;
  justify-content: center;
}

.new-art-card__placeholder svg { width: 40px; height: 40px; color: var(--color-primary); opacity: 0.4; }

.new-art-card__badge {
  position: absolute;
  top: 16px;
  left: 16px;
  background: rgba(255,255,255,0.95);
  backdrop-filter: blur(8px);
  -webkit-backdrop-filter: blur(8px);
  color: var(--color-primary);
  font-size: 12px;
  font-weight: 700;
  text-transform: uppercase;
  letter-spacing: 0.08em;
  padding: 4px 12px;
  border-radius: var(--border-radius-pill);
  box-shadow: 0 1px 4px rgba(0,0,0,0.08);
}

.new-art-card__body {
  padding: 24px;
  flex: 1;
  display: flex;
  flex-direction: column;
}

@media (min-width: 768px) { .new-art-card__body { padding: 32px; } }

.new-art-card__meta {
  font-size: 14px;
  color: var(--color-slate-500);
  font-weight: 500;
  margin: 0 0 12px;
}

.new-art-card__title {
  font-size: 20px;
  font-weight: 700;
  color: var(--color-slate-900);
  margin: 0 0 12px;
  line-height: 1.3;
  transition: color var(--transition-fast);
}

@media (min-width: 768px) { .new-art-card__title { font-size: 24px; } }

.new-art-card:hover .new-art-card__title { color: var(--color-primary); }

.new-art-card__excerpt {
  font-size: 16px;
  font-weight: 300;
  color: var(--color-slate-600);
  line-height: 1.6;
  margin: 0 0 20px;
  flex: 1;
  display: -webkit-box;
  -webkit-box-orient: vertical;
  -webkit-line-clamp: 3;
  overflow: hidden;
}

.new-art-card__read {
  font-size: 14px;
  font-weight: 700;
  color: var(--color-slate-900);
  text-decoration: none;
  transition: color var(--transition-fast);
  display: inline-flex;
  align-items: center;
  gap: 4px;
  margin-top: auto;
}

.new-art-card:hover .new-art-card__read { color: var(--color-pink); }

/* Empty state for writings */
.writings-empty {
  text-align: center;
  padding: 60px 20px;
  grid-column: 1 / -1;
  color: var(--color-slate-600);
}

.writings-empty svg {
  width: 48px; height: 48px;
  color: var(--color-slate-400);
  margin: 0 auto 16px;
  display: block;
}

.writings-empty h3 {
  font-size: 1.1rem;
  font-weight: 700;
  color: var(--color-slate-900);
  margin: 0 0 8px;
}

.writings-empty p { margin: 0; font-size: 0.95rem; }

/* Browse all button */
.browse-wrap {
  margin-top: 64px;
  text-align: center;
}

.btn-browse {
  display: inline-flex;
  align-items: center;
  gap: 8px;
  padding: 16px 32px;
  background: var(--color-white);
  border: 2px solid var(--color-slate-200);
  border-radius: var(--border-radius-pill);
  color: var(--color-slate-800);
  font-weight: 700;
  font-size: 15px;
  text-decoration: none;
  transition: border-color var(--transition-fast), color var(--transition-fast), transform var(--transition-fast);
  cursor: pointer;
  font-family: inherit;
}

.btn-browse:hover {
  border-color: var(--color-primary);
  color: var(--color-primary);
}

.btn-browse:active { transform: scale(0.95); }