/* columns.css — 專欄區塊：特稿 / 解析 / 專題 differentiated layouts */

/* === SHARED COLUMN BLOCK BASE === */
.column-block {
  margin-bottom: 48px;
  padding-bottom: 32px;
  border-bottom: 4px solid var(--fg);
}

/* =====================================================
   FEATURE BLOCK / 特稿 — immersive narrative
   ===================================================== */

/* Lead feature: full-bleed hero image + overlay content */
.feature-lead {
  display: block;
  position: relative;
  text-decoration: none;
  color: inherit;
  margin-top: 16px;
  margin-bottom: 0;
  overflow: hidden;
}

.feature-lead-image {
  width: 100%;
  aspect-ratio: 2 / 1;
  background: var(--fg);
  overflow: hidden;
}

.feature-lead-image img {
  width: 100%;
  height: 100%;
  object-fit: cover;
  display: block;
  opacity: 0.85;
  transition: opacity 0.3s;
}

.feature-lead:hover .feature-lead-image img {
  opacity: 1;
}

.feature-lead-content {
  padding: 24px 0 16px;
}

.feature-lead-title {
  font-family: var(--font-display);
  font-size: var(--text-2xl);
  font-weight: 900;
  line-height: var(--leading-tight, 1.1);
  letter-spacing: var(--tracking-display, -0.03em);
  margin-bottom: 12px;
  transition: color 0.15s;
}

.feature-lead:hover .feature-lead-title {
  color: var(--accent);
}

.feature-lead-deck {
  font-family: var(--font-body);
  font-size: var(--text-lg);
  line-height: 1.5;
  color: var(--fg-2);
  max-width: 55ch;
  margin-bottom: 12px;
}

/* Drop cap on first line of deck */
.feature-lead-deck::first-letter {
  font-family: var(--font-display);
  font-size: 3.2em;
  float: left;
  line-height: 0.8;
  margin-right: 8px;
  margin-top: 4px;
  color: var(--accent);
  font-weight: 900;
}

.feature-lead-meta {
  font-family: var(--font-mono);
  font-size: 11px;
  color: var(--muted);
  letter-spacing: 0.06em;
  text-transform: uppercase;
}

/* Secondary feature cards: compact grid */
.feature-secondary {
  display: grid;
  grid-template-columns: repeat(auto-fill, minmax(240px, 1fr));
  gap: 0;
  border-top: 2px solid var(--fg);
  margin-top: 16px;
}

.feature-secondary .feature-card {
  display: flex;
  flex-direction: column;
  padding: 16px 12px;
  border-bottom: 1px solid var(--border-soft);
  border-right: 1px solid var(--border-soft);
  text-decoration: none;
  color: inherit;
  transition: background 0.15s;
}

.feature-secondary .feature-card:hover {
  background: var(--surface-warm);
}

.feature-secondary .feature-card:hover .feature-card-title {
  color: var(--accent);
  text-decoration: underline;
  text-underline-offset: 3px;
  text-decoration-thickness: 2px;
}

.feature-secondary .feature-card-title {
  font-family: var(--font-body);
  font-size: 16px;
  font-weight: 600;
  line-height: 1.4;
  margin-bottom: 6px;
  transition: color 0.1s;
}

.feature-secondary .feature-card-excerpt {
  font-family: var(--font-body);
  font-size: 14px;
  line-height: 1.5;
  color: var(--fg-2);
  margin-bottom: 8px;
  display: -webkit-box;
  -webkit-line-clamp: 2;
  -webkit-box-orient: vertical;
  overflow: hidden;
}

.feature-secondary .feature-card-time {
  font-family: var(--font-mono);
  font-size: 11px;
  color: var(--muted);
  letter-spacing: 0.04em;
  margin-top: auto;
}

/* =====================================================
   EXPLAINER BLOCK / 解析 — structured, modular
   ===================================================== */

.explainer-grid {
  display: grid;
  grid-template-columns: 1fr;
  gap: 0;
  margin-top: 16px;
}

.explainer-card {
  display: grid;
  grid-template-columns: 56px 1fr;
  gap: 16px;
  align-items: start;
  padding: 20px 12px;
  border-bottom: 1px solid var(--border-soft);
  text-decoration: none;
  color: inherit;
  transition: background 0.15s;
}

.explainer-card:last-child {
  border-bottom: none;
}

.explainer-card:hover {
  background: var(--surface-warm);
}

.explainer-card:hover .explainer-card-title {
  color: var(--accent);
  text-decoration: underline;
  text-underline-offset: 3px;
  text-decoration-thickness: 2px;
}

.explainer-card-number {
  font-family: var(--font-display);
  font-size: 28px;
  font-weight: 900;
  line-height: 1;
  color: var(--fg);
  letter-spacing: -0.02em;
  padding-top: 2px;
}

.explainer-card:hover .explainer-card-number {
  color: var(--accent);
}

.explainer-card-body {
  display: flex;
  flex-direction: column;
  gap: 4px;
}

.explainer-card-title {
  font-family: var(--font-body);
  font-size: var(--text-lg);
  font-weight: 600;
  line-height: 1.35;
  transition: color 0.1s;
}

.explainer-card-excerpt {
  font-family: var(--font-body);
  font-size: var(--text-base);
  line-height: 1.5;
  color: var(--fg-2);
  display: -webkit-box;
  -webkit-line-clamp: 2;
  -webkit-box-orient: vertical;
  overflow: hidden;
}

.explainer-card-meta {
  font-family: var(--font-mono);
  font-size: 11px;
  color: var(--muted);
  letter-spacing: 0.04em;
  text-transform: uppercase;
  margin-top: 4px;
}

/* =====================================================
   SPECIAL PROJECT BLOCK / 專題 — hub with sub-articles
   ===================================================== */

.special-hub {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 0;
  margin-top: 16px;
  border: 2px solid var(--fg);
}

.special-hub-lead {
  position: relative;
  display: block;
  text-decoration: none;
  color: inherit;
  overflow: hidden;
  border-right: 2px solid var(--fg);
}

.special-hub-lead-img {
  width: 100%;
  height: 100%;
  object-fit: cover;
  display: block;
  min-height: 280px;
}

.special-hub-lead-overlay {
  position: absolute;
  bottom: 0;
  left: 0;
  right: 0;
  padding: 24px 16px;
  background: linear-gradient(to top, rgba(0,0,0,0.85) 0%, transparent 100%);
}

.special-hub-lead-title {
  display: block;
  font-family: var(--font-display);
  font-size: var(--text-xl);
  font-weight: 900;
  line-height: 1.2;
  letter-spacing: -0.02em;
  color: #F4F4F0;
  margin-bottom: 6px;
}

.special-hub-lead:hover .special-hub-lead-title {
  color: var(--accent);
}

.special-hub-lead-deck {
  display: block;
  font-family: var(--font-body);
  font-size: 14px;
  line-height: 1.5;
  color: rgba(244,244,240,0.8);
  display: -webkit-box;
  -webkit-line-clamp: 2;
  -webkit-box-orient: vertical;
  overflow: hidden;
}

/* Sub-articles list */
.special-hub-sub {
  display: flex;
  flex-direction: column;
}

.special-hub-item {
  display: flex;
  flex-direction: column;
  gap: 4px;
  padding: 16px;
  border-bottom: 1px solid var(--border-soft);
  text-decoration: none;
  color: inherit;
  transition: background 0.15s;
  flex: 1;
}

.special-hub-item:last-child {
  border-bottom: none;
}

.special-hub-item:hover {
  background: var(--surface-warm);
}

.special-hub-item:hover .special-hub-item-title {
  color: var(--accent);
  text-decoration: underline;
  text-underline-offset: 3px;
  text-decoration-thickness: 2px;
}

.special-hub-item-title {
  font-family: var(--font-body);
  font-size: 15px;
  font-weight: 600;
  line-height: 1.4;
  transition: color 0.1s;
}

.special-hub-item-time {
  font-family: var(--font-mono);
  font-size: 11px;
  color: var(--muted);
  letter-spacing: 0.04em;
}

/* === RESPONSIVE === */
@media (max-width: 768px) {
  .feature-lead-image {
    aspect-ratio: 16 / 9;
  }

  .feature-lead-title {
    font-size: var(--text-xl);
  }

  .feature-lead-deck::first-letter {
    font-size: 2.6em;
  }

  .feature-secondary {
    grid-template-columns: 1fr;
  }

  .feature-secondary .feature-card {
    border-right: none;
  }

  .explainer-card {
    grid-template-columns: 40px 1fr;
    gap: 12px;
    padding: 16px 8px;
  }

  .explainer-card-number {
    font-size: 22px;
  }

  .special-hub {
    grid-template-columns: 1fr;
  }

  .special-hub-lead {
    border-right: none;
    border-bottom: 2px solid var(--fg);
  }

  .special-hub-lead-img {
    min-height: 200px;
  }
}