.topic-hero-strip {
  background: var(--hero-light);
  padding: 40px 24px;
  border-bottom: 4px solid var(--black-line);
  position: relative;
  z-index: 1;
}

.topic-hero-strip h1 {
  max-width: 900px;
  margin: 0 auto;
  font-size: clamp(1.8rem, 4vw, 2.5rem);
  color: var(--black-line);
  text-transform: lowercase;
  font-weight: 800;
}

.topic-content {
  max-width: 900px;
  margin: 0 auto;
  padding: 48px 24px 80px;
  position: relative;
  z-index: 1;
}

.topic-content h2 {
  font-size: 1.35rem;
  margin: 32px 0 14px;
  text-transform: lowercase;
  border-left: 5px solid var(--primary);
  padding-left: 14px;
}

.topic-content h3 {
  font-size: 1.1rem;
  margin: 20px 0 10px;
  text-transform: lowercase;
}

.topic-content p {
  color: var(--muted);
  margin-bottom: 14px;
  font-size: 15px;
  line-height: 1.7;
}

.topic-content ul {
  padding-left: 24px;
  margin-bottom: 16px;
  color: var(--muted);
}

.topic-content li {
  margin-bottom: 8px;
  font-size: 15px;
}

.topic-pull-quote {
  font-size: 1.2rem;
  font-style: italic;
  color: var(--text);
  border-left: 6px solid var(--bauhaus-yellow);
  padding: 20px 24px;
  margin: 28px 0;
  background: var(--secondary);
}

.topic-sidebar-layout {
  display: grid;
  grid-template-columns: 240px 1fr;
  gap: 40px;
  max-width: 1100px;
  margin: 0 auto;
  padding: 48px 24px 80px;
  position: relative;
  z-index: 1;
}

.topic-sidebar {
  position: sticky;
  top: 80px;
  align-self: start;
}

.topic-sidebar nav a {
  display: block;
  padding: 10px 0;
  color: var(--muted);
  font-size: 14px;
  border-bottom: 1px solid var(--border);
}

.topic-sidebar nav a:hover {
  color: var(--accent);
}

.topic-split-layout {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 48px;
  max-width: 1100px;
  margin: 0 auto;
  padding: 48px 24px 80px;
  position: relative;
  z-index: 1;
}

.topic-stat-band {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 16px;
  margin: 32px 0;
}

.topic-stat {
  padding: 20px;
  border: 3px solid var(--black-line);
  text-align: center;
  background: var(--secondary);
}

.topic-stat strong {
  display: block;
  font-size: 1.4rem;
  color: var(--primary);
}

.topic-stat span {
  font-size: 12px;
  color: var(--muted);
}

.topic-image-rail {
  max-width: 500px;
  max-height: 320px;
  overflow: hidden;
  border: 3px solid var(--black-line);
  margin: 24px 0;
}

.topic-image-rail img {
  width: 100%;
  height: 100%;
  object-fit: cover;
}

.topic-bg-band {
  padding: 48px 24px;
  background: var(--surface);
  position: relative;
  z-index: 1;
}

.topic-bg-band-inner {
  max-width: 900px;
  margin: 0 auto;
}

.topic-mosaic-grid {
  display: grid;
  grid-template-columns: repeat(2, 1fr);
  gap: 20px;
  margin: 28px 0;
}

.topic-mosaic-cell {
  padding: 20px;
  border: 3px solid var(--black-line);
  background: var(--secondary);
}

.geometric-bauhaus-accent {
  width: 100%;
  height: var(--geometric-unit);
  background: var(--primary-colors-triad);
  margin-bottom: var(--design-theory-spacing);
  opacity: var(--abstract-opacity);
}

@media (max-width: 768px) {
  .topic-sidebar-layout,
  .topic-split-layout {
    grid-template-columns: 1fr;
  }

  .topic-sidebar {
    position: static;
  }

  .topic-stat-band {
    grid-template-columns: 1fr;
  }

  .topic-image-rail {
    max-width: 100%;
    max-height: 240px;
  }
}