.topic-hero {
  padding: 56px 24px 40px;
  border-bottom: 1px solid var(--border);
  background:
    linear-gradient(135deg, rgba(34, 197, 94, 0.12) 0%, transparent 48%),
    var(--surface);
}

.topic-hero-inner {
  max-width: 860px;
  margin: 0 auto;
}

.topic-hero h1 {
  font-family: var(--font-serif);
  font-size: clamp(1.9rem, 3.5vw, 2.6rem);
  font-weight: 500;
  margin-bottom: 12px;
  letter-spacing: -0.01em;
}

.topic-hero p {
  color: rgba(250, 250, 250, 0.72);
  font-family: var(--font-serif);
  font-size: 1.05rem;
  max-width: 46ch;
}

.topic-layout {
  max-width: 1100px;
  margin: 0 auto;
  padding: 48px 24px 80px;
  display: grid;
  grid-template-columns: minmax(0, 1.4fr) minmax(220px, 0.7fr);
  gap: 40px;
  align-items: start;
}

.topic-layout--rail-left {
  grid-template-columns: minmax(220px, 0.7fr) minmax(0, 1.4fr);
}

.topic-layout--stack {
  display: block;
  max-width: 820px;
}

.topic-prose h2 {
  font-family: var(--font-serif);
  font-size: 1.35rem;
  margin: 28px 0 12px;
  font-weight: 500;
}

.topic-prose h2:first-child {
  margin-top: 0;
}

.topic-prose p {
  color: rgba(250, 250, 250, 0.78);
  font-family: var(--font-serif);
  margin-bottom: 14px;
  font-size: 0.98rem;
}

.topic-prose ul {
  padding-left: 1.2rem;
  margin: 0 0 18px;
  color: rgba(250, 250, 250, 0.78);
  font-family: var(--font-serif);
}

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

.topic-rail {
  position: sticky;
  top: calc(var(--nav-h) + 16px);
  display: flex;
  flex-direction: column;
  gap: 16px;
}

.topic-rail figure {
  margin: 0;
  overflow: hidden;
  background: var(--bg);
  border: 1px solid rgba(250, 250, 250, 0.08);
}

.topic-rail img {
  width: 100%;
  max-width: 100%;
  height: auto;
  max-height: 280px;
  object-fit: cover;
  display: block;
}

.topic-band {
  margin: 36px 0;
  padding: 28px;
  background: rgba(34, 197, 94, 0.08);
  border-top: 1px solid var(--border);
  border-bottom: 1px solid var(--border);
}

.topic-band p {
  margin: 0;
  font-family: var(--font-serif);
  color: rgba(250, 250, 250, 0.88);
  font-size: 1.05rem;
}

.topic-stats {
  display: grid;
  grid-template-columns: repeat(3, minmax(0, 1fr));
  gap: 12px;
  margin: 28px 0;
}

.topic-stat {
  padding: 16px 12px;
  border-top: 1px solid var(--border);
  text-align: center;
}

.topic-stat strong {
  display: block;
  font-family: var(--font-label);
  letter-spacing: 0.1em;
  text-transform: uppercase;
  font-size: 0.7rem;
  color: var(--accent);
  margin-bottom: 6px;
}

.topic-stat span {
  font-family: var(--font-serif);
  color: rgba(250, 250, 250, 0.75);
  font-size: 0.9rem;
}

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

.topic-split img {
  width: 100%;
  max-width: 100%;
  max-height: 300px;
  object-fit: cover;
  display: block;
}

.topic-back {
  display: inline-flex;
  margin-top: 28px;
  font-family: var(--font-label);
  letter-spacing: 0.12em;
  text-transform: uppercase;
  font-size: 0.7rem;
  color: var(--accent);
}

.topic-back:hover {
  color: var(--primary);
}

@media (max-width: 860px) {
  .topic-layout,
  .topic-layout--rail-left {
    grid-template-columns: 1fr;
    gap: 28px;
    padding: 36px 16px 64px;
  }

  .topic-rail {
    position: static;
    flex-direction: row;
    flex-wrap: wrap;
  }

  .topic-rail figure {
    flex: 1 1 160px;
    max-width: 100%;
  }

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

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

  .topic-hero {
    padding: 40px 16px 28px;
  }
}

@media (max-width: 375px) {
  .topic-layout,
  .topic-layout--rail-left,
  .topic-layout--stack {
    padding-left: 12px;
    padding-right: 12px;
  }

  .topic-rail img,
  .topic-split img {
    max-width: 100%;
    max-height: 200px;
  }
}