.topic-hero-strip {
  display: grid;
  grid-template-columns: 1fr 1fr;
  min-height: 220px;
  border-bottom: 1px solid var(--border);
}

.topic-hero-strip .strip-a {
  background: var(--primary);
  display: flex;
  align-items: center;
  padding: 36px 40px;
  border-right: 2px solid var(--accent);
}

.topic-hero-strip .strip-a h1 {
  color: #fff;
  font-size: clamp(1.4rem, 3vw, 2rem);
}

.topic-hero-strip .strip-b {
  background: var(--surface);
  display: flex;
  align-items: center;
  padding: 36px 40px;
  color: var(--muted);
  font-size: 0.95rem;
}

@media (max-width: 768px) {
  .topic-hero-strip {
    grid-template-columns: 1fr;
  }
  .topic-hero-strip .strip-a {
    border-right: none;
    border-bottom: 2px solid var(--accent);
  }
}

.topic-body {
  max-width: var(--max);
  margin: 0 auto;
  padding: 48px 24px 72px;
}

.topic-body h2 {
  font-size: 1.2rem;
  margin: 32px 0 12px;
}

.topic-body h3 {
  font-size: 1rem;
  margin: 20px 0 8px;
  color: var(--primary);
}

.topic-body p {
  color: var(--muted);
  margin-bottom: 14px;
}

.topic-body ul {
  color: var(--muted);
  margin-bottom: 16px;
}

.topic-body li {
  margin-bottom: 6px;
}

.topic-sidebar-layout {
  display: grid;
  grid-template-columns: 220px 1fr;
  gap: 32px;
  align-items: start;
}

.topic-rail {
  position: sticky;
  top: 24px;
  padding: 16px;
  background: var(--surface);
  border: 1px solid var(--border);
}

.topic-rail .metric-chip {
  display: block;
  margin-bottom: 8px;
  text-align: center;
}

.topic-stat-band {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 12px;
  margin: 24px 0;
}

.topic-stat-band .stat {
  padding: 18px;
  background: var(--surface);
  border: 1px solid var(--border);
  text-align: center;
}

.topic-stat-band .stat .metrics {
  display: block;
  font-size: 1.4rem;
  color: var(--secondary);
  margin-bottom: 4px;
}

.topic-stat-band .stat span:last-child {
  font-size: 0.75rem;
  color: var(--muted);
}

.topic-split {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 28px;
  margin: 24px 0;
  align-items: start;
}

.topic-pull {
  padding: 24px;
  margin: 28px 0;
  background: rgba(99, 102, 241, 0.08);
  border-left: 4px solid var(--primary);
  font-size: 1.05rem;
  color: var(--text);
}

.topic-mosaic {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 12px;
  margin: 20px 0;
}

.topic-mosaic .decor-band {
  margin: 0;
  max-width: none;
  height: 160px;
}

.topic-callout {
  padding: 20px;
  border: 1px solid var(--border);
  background: var(--surface);
  margin: 20px 0;
}

@media (max-width: 800px) {
  .topic-sidebar-layout {
    grid-template-columns: 1fr;
  }
  .topic-rail {
    position: static;
    display: flex;
    flex-wrap: wrap;
    gap: 8px;
  }
  .topic-rail .metric-chip {
    margin: 0;
  }
  .topic-stat-band {
    grid-template-columns: 1fr;
  }
  .topic-split {
    grid-template-columns: 1fr;
  }
  .topic-mosaic {
    grid-template-columns: 1fr;
  }
}