@media (max-width: 1080px) {
  .masthead {
    grid-template-columns: minmax(18rem, 1fr) auto;
  }

  .chapter-header {
    grid-template-columns: auto 1px minmax(0, 1fr);
  }

  .finding-block {
    grid-column: 1 / -1;
    margin-top: 0;
  }

  .atlas-field {
    grid-template-columns: 1fr 1fr;
  }

  .scale-panel {
    grid-column: 1 / -1;
    grid-row: 1;
    display: grid;
    grid-template-columns: minmax(13rem, 0.45fr) minmax(0, 1fr);
    gap: 1rem;
    align-items: center;
    min-height: 210px;
    border-inline: 0;
    border-bottom: 1px solid var(--line);
    padding: 0 0 1rem;
  }

  .scale-chart {
    height: 195px;
  }

  .scale-context-note {
    margin-top: 0;
  }

  .map-wrap,
  .region-map {
    min-height: 0;
    height: auto;
    aspect-ratio: 1.12;
  }

  .mobile-map-picker {
    display: grid;
    gap: 0.35rem;
    margin-top: 0.65rem;
    color: var(--muted);
    font-size: 0.78rem;
    font-weight: 700;
  }

  .mobile-map-picker select {
    width: 100%;
    min-height: 44px;
    padding: 0 0.7rem;
    border: 1px solid var(--line-strong);
    border-radius: 0;
    background: var(--paper-bright);
    color: var(--ink);
    font: 1rem var(--sans);
  }

  .map-label {
    font-size: 15px;
  }

  .map-label.selected {
    font-size: 16px;
  }
}

@media (max-width: 760px) {
  .masthead {
    min-height: 60px;
    padding: 0.75rem 1rem;
    grid-template-columns: minmax(0, 1fr) auto;
    gap: 0.5rem;
  }

  .site-title {
    font-size: clamp(1.25rem, 6vw, 1.7rem);
  }

  .masthead-actions .text-action {
    min-width: 44px;
    padding-inline: 0.45rem;
  }

  .masthead-actions .action-symbol {
    display: inline;
  }

  .masthead-actions .action-label {
    display: none;
  }

  .primary-nav {
    padding: 0 1rem;
    gap: 1.35rem;
  }

  .page {
    --section-pad: 1rem;
  }

  .chapter-header {
    grid-template-columns: auto 1px minmax(0, 1fr);
    gap: 0.7rem;
  }

  .chapter-number {
    font-size: 3rem;
  }

  .chapter-divider {
    height: 2.8rem;
  }

  .chapter-title {
    font-size: clamp(2rem, 7vw, 2.8rem);
  }

  .finding-title {
    font-size: clamp(1.85rem, 6.5vw, 2.45rem);
  }

  .finding-deck {
    font-size: 1.05rem;
  }

  .time-basis {
    display: grid;
    gap: 0.35rem;
  }

  .time-basis span + span {
    border-left: 0;
    padding-left: 0;
  }

  .evidence-toolbar {
    align-items: flex-start;
    flex-direction: column;
  }

  .scope-actions {
    width: 100%;
    justify-content: space-between;
  }

  .atlas-field {
    display: flex;
    flex-direction: column;
    gap: 1.8rem;
  }

  .scale-panel {
    display: block;
    order: -1;
    min-height: 0;
  }

  .scale-copy {
    min-height: 0;
  }

  .scale-chart {
    height: auto;
    aspect-ratio: 2.73;
  }

  .scale-context-note {
    margin-top: 0.4rem;
  }

  .map-wrap,
  .region-map {
    min-height: 0;
    height: auto;
    aspect-ratio: 1.12;
  }

  .figure-footer {
    grid-template-columns: 1fr;
  }

  .page-break {
    min-height: 58px;
    padding: 0 1rem;
  }
}

@media (max-width: 420px) {
  .chapter-title {
    font-size: clamp(1.75rem, 8vw, 2rem);
  }

  .map-wrap,
  .region-map {
    min-height: 0;
    height: auto;
  }

  .segmented {
    width: 100%;
  }

  .segmented button {
    flex: 1;
  }

  .map-label {
    font-size: 18px;
  }

  .map-label.selected {
    font-size: 19px;
  }
}