.topic-hero {
  position: relative;
  overflow: hidden;
  padding: 48px 24px 40px;
  border-bottom: 1px solid var(--border);
  margin-bottom: 8px;
  max-width: 100%;
}

.topic-hero-bg {
  position: absolute;
  inset: 0;
  background-size: cover;
  background-position: center;
  filter: blur(4px) brightness(0.35);
  transform: scale(1.06);
  z-index: 0;
  max-width: 100%;
}

.topic-hero-inner {
  position: relative;
  z-index: 1;
  max-width: var(--max-w);
  margin: 0 auto;
}

.topic-hero h1 {
  font-size: clamp(1.7rem, 3.5vw, 2.4rem);
  margin-bottom: 10px;
}

.topic-hero p {
  max-width: 60ch;
  color: var(--muted);
}

.topic-grid {
  display: grid;
  grid-template-columns: 1fr 280px;
  gap: 28px;
  align-items: start;
}

.topic-rail {
  position: sticky;
  top: 72px;
  padding: 18px;
  border-radius: 14px;
  background: var(--surface);
  background-image: var(--surface-grad);
  border: 1px solid var(--border);
  box-shadow: var(--shadow-raised);
}

.topic-rail h2 {
  font-size: 1rem;
  margin: 0 0 12px;
}

.topic-rail ol {
  margin-left: 1.1rem;
  color: var(--muted);
  font-size: 0.9rem;
}

.topic-rail li {
  margin-bottom: 8px;
}

.topic-split {
  display: grid;
  grid-template-columns: minmax(160px, 280px) 1fr;
  gap: 24px;
  align-items: start;
  margin: 24px 0;
}

.topic-quote {
  margin: 24px 0;
  padding: 20px 22px;
  border-left: 4px solid var(--primary);
  background: rgba(30, 41, 59, 0.75);
  border-radius: 0 12px 12px 0;
  font-size: 1.05rem;
  color: rgba(248, 250, 252, 0.92);
  box-shadow: var(--shadow-raised);
}

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

.topic-stat-band div {
  text-align: center;
  padding: 16px 10px;
  border-radius: 12px;
  border: 1px solid var(--border);
  background: linear-gradient(180deg, rgba(255, 255, 255, 0.06), transparent), var(--surface);
  box-shadow: var(--shadow-raised);
}

.topic-stat-band strong {
  display: block;
  font-size: 1.3rem;
  color: var(--accent);
}

.topic-mosaic {
  display: grid;
  grid-template-columns: 1.2fr 0.8fr;
  gap: 18px;
  margin: 24px 0;
  align-items: center;
}

.topic-callout {
  padding: 18px;
  border-radius: 12px;
  border: 1px solid rgba(56, 189, 248, 0.3);
  background: rgba(56, 189, 248, 0.08);
  margin: 18px 0;
}

@media (max-width: 860px) {
  .topic-grid,
  .topic-split,
  .topic-mosaic,
  .topic-stat-band {
    grid-template-columns: 1fr;
  }

  .topic-rail {
    position: static;
  }

  .topic-hero-bg {
    transform: none;
    inset: 0;
  }

  .topic-split img,
  .topic-mosaic img,
  .decor-img {
    max-width: 100%;
    height: auto;
  }
}

@media (max-width: 375px) {
  .topic-hero {
    padding-left: 16px;
    padding-right: 16px;
  }

  .topic-hero-bg {
    transform: none;
  }

  .topic-page {
    padding-left: 16px;
    padding-right: 16px;
  }
}