.preview-shell {
  max-width: 1200px;
  margin: 0 auto;
  display: grid;
  gap: 1.25rem;
}

.preview-head h1 {
  margin-bottom: 0.35rem;
}

.preview-nav {
  display: flex;
  flex-wrap: wrap;
  gap: 0.8rem;
  margin-top: 0.75rem;
}

.preview-nav a {
  border: 1px solid var(--line);
  border-radius: 999px;
  padding: 0.35rem 0.8rem;
  background: color-mix(in hsl, var(--paper), white 25%);
}

.preview-image img {
  width: 100%;
  display: block;
  border-radius: 10px;
  border: 1px solid var(--line);
  background: #dfd7ca;
}

.option-a {
  display: grid;
  gap: 1rem;
}

.hero-block {
  display: grid;
  gap: 0.65rem;
}

.detail-rail {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 1rem;
}

.detail-card {
  display: grid;
  gap: 0.45rem;
}

.option-b {
  display: grid;
  gap: 1rem;
}

.pair-row {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 1rem;
}

.note { color: var(--muted); }

.option-c {
  display: grid;
  grid-template-columns: 280px 1fr;
  gap: 1rem;
  align-items: start;
}

.option-d {
  display: grid;
  gap: 1rem;
}

.d-intro {
  display: grid;
  grid-template-columns: minmax(0, 1.9fr) minmax(240px, 1fr);
  gap: 1rem;
  align-items: end;
}

.d-module {
  display: grid;
  grid-template-columns: minmax(0, 1.9fr) minmax(240px, 1fr);
  gap: 1rem;
  align-items: start;
}

.d-pair {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 1rem;
}

.d-info,
.d-note {
  border: 1.4px solid color-mix(in hsl, var(--accent), black 15%);
  border-radius: 8px;
  background: color-mix(in hsl, var(--paper), white 16%);
  padding: 0.85rem 0.9rem;
}

.d-info h3,
.d-note h3 {
  margin: 0 0 0.45rem;
}

.d-info p,
.d-note p {
  margin: 0 0 0.48rem;
  line-height: 1.4;
}

.d-info p:last-child,
.d-note p:last-child {
  margin-bottom: 0;
}

.sheet-meta {
  position: sticky;
  top: 1rem;
  padding: 0.8rem;
  border: 1px solid var(--line);
  border-radius: 10px;
  background: color-mix(in hsl, var(--paper), white 18%);
}

.sheet-grid {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 0.85rem;
}

@media (max-width: 1024px) {
  .detail-rail,
  .pair-row,
  .sheet-grid,
  .d-pair {
    grid-template-columns: 1fr 1fr;
  }

  .option-c,
  .d-intro,
  .d-module {
    grid-template-columns: 1fr;
  }

  .sheet-meta {
    position: static;
  }
}

@media (max-width: 720px) {
  .detail-rail,
  .pair-row,
  .sheet-grid,
  .d-pair {
    grid-template-columns: 1fr;
  }
}