:root {
  --color-page: #F5F1E8;
  --color-panel: #EAE4D8;
  --color-panel-strong: #E1D7C5;
  --color-ink: #1F1F1B;
  --color-muted: #5A564E;
  --color-line: #CFC7B8;
  --color-risk: #8F3B24;
  --color-contained: #1F5C56;
  --color-highlight: #D9CFBB;
  --color-risk-soft: rgba(143, 59, 36, 0.12);
  --color-contained-soft: rgba(31, 92, 86, 0.12);

  --font-sans: "Recursive", "IBM Plex Sans", system-ui, sans-serif;
  --font-mono: "Recursive", "IBM Plex Mono", ui-monospace, monospace;
  --font-editorial: "Newsreader", "Iowan Old Style", Georgia, serif;

  --text-meta: 0.75rem;
  --text-mono: 0.8125rem;
  --text-body: 1.0625rem;
  --text-body-lg: 1.125rem;
  --text-title-sm: 1.5rem;
  --text-title-md: 2rem;
  --text-title-lg: clamp(2.2rem, 4vw, 3.2rem);
  --text-premise: clamp(2.55rem, 5.8vw, 4.4rem);

  --leading-tight: 1.08;
  --leading-copy: 1.45;
  --leading-mono: 1.35;

  --measure-copy: 68ch;
  --measure-rail: 38ch;

  --border-default: 1px solid var(--color-line);
  --border-strong: 1.5px solid var(--color-ink);
  --radius-card: 10px;
  --radius-chip: 999px;
  --shadow-paper: 0 1px 0 rgba(31, 31, 27, 0.06);

  --space-2: 0.125rem;
  --space-4: 0.25rem;
  --space-8: 0.5rem;
  --space-12: 0.75rem;
  --space-16: 1rem;
  --space-20: 1.25rem;
  --space-24: 1.5rem;
  --space-32: 2rem;
  --space-40: 2.5rem;
  --space-48: 3rem;
  --space-64: 4rem;
  --space-80: 5rem;

  --page-max: 86rem;
  --boundary-columns: 1.15fr 0.78fr 1fr;

  --ease-standard: cubic-bezier(0.2, 0.8, 0.2, 1);
  --dur-fast: 120ms;
  --dur-base: 180ms;
  --dur-slow: 260ms;
}

*,
*::before,
*::after {
  box-sizing: border-box;
}

html {
  color-scheme: light;
  scroll-behavior: smooth;
}

body {
  margin: 0;
  background:
    radial-gradient(circle at top right, rgba(31, 92, 86, 0.06), transparent 28rem),
    radial-gradient(circle at top left, rgba(143, 59, 36, 0.05), transparent 22rem),
    var(--color-page);
  color: var(--color-ink);
  font-family: var(--font-sans);
  font-size: var(--text-body);
  line-height: var(--leading-copy);
  font-variation-settings: "MONO" 0, "CASL" 0, "slnt" 0;
  text-rendering: optimizeLegibility;
}

a {
  color: inherit;
  text-decoration-thickness: 1px;
  text-underline-offset: 0.18em;
}

button,
input,
textarea {
  font: inherit;
}

.page-shell {
  width: min(100% - 2rem, var(--page-max));
  margin: 0 auto;
  padding-bottom: var(--space-48);
}

.topbar {
  position: sticky;
  top: 0;
  z-index: 20;
  backdrop-filter: blur(12px);
  background: rgba(245, 241, 232, 0.84);
  border-bottom: var(--border-default);
}

.topbar-inner {
  width: min(100% - 2rem, var(--page-max));
  margin: 0 auto;
  padding: var(--space-12) 0;
  display: grid;
  grid-template-columns: auto 1fr;
  align-items: center;
  gap: var(--space-16);
}

.brand-block {
  display: grid;
  gap: var(--space-4);
  align-content: start;
}

.brand-lockup {
  display: inline-flex;
  align-items: center;
  gap: 0.55rem;
}

.brand-glyph {
  font-family: var(--font-mono);
  font-size: 0.8rem;
  line-height: 1;
  letter-spacing: -0.22em;
  color: var(--color-contained);
  transform: translateY(-0.04rem);
}

.brand {
  font-family: var(--font-mono);
  font-size: var(--text-mono);
  text-transform: uppercase;
  letter-spacing: 0.08em;
  font-variation-settings: "MONO" 1, "CASL" 0;
}

.topnav {
  display: flex;
  justify-content: flex-end;
  gap: var(--space-16);
  flex-wrap: wrap;
}

.topnav a,
.topbar-note {
  font-family: var(--font-mono);
  font-size: var(--text-meta);
  color: var(--color-muted);
  text-transform: lowercase;
  text-decoration: none;
  white-space: nowrap;
}

.topbar-note {
  line-height: 1;
}

.section {
  padding-top: var(--space-48);
}

.section:not(.boundary-section) {
  margin-top: var(--space-24);
  padding-top: var(--space-28, 1.75rem);
  border-top: var(--border-default);
}

.section-kicker {
  margin: 0 0 var(--space-16);
  font-family: var(--font-mono);
  font-size: var(--text-meta);
  letter-spacing: 0.06em;
  text-transform: uppercase;
  color: var(--color-muted);
}

.boundary-section {
  padding-top: var(--space-24);
  min-height: min(calc(100svh - 4rem), 54rem);
  display: grid;
  align-content: start;
  gap: var(--space-16);
}

.boundary-head {
  display: grid;
  grid-template-columns: minmax(0, 1fr) minmax(14rem, 18rem);
  align-items: end;
  gap: var(--space-24);
}

.premise {
  margin: 0;
  max-width: 11.5ch;
  font-size: var(--text-premise);
  line-height: var(--leading-tight);
  letter-spacing: -0.04em;
  font-weight: 560;
  font-variation-settings: "MONO" 0, "CASL" 0, "slnt" 0;
  text-wrap: balance;
}

.boundary-subcopy {
  margin: 0;
  max-width: 42rem;
  font-size: var(--text-body-lg);
  color: var(--color-muted);
}

.boundary-subcopy--editorial {
  font-family: var(--font-editorial);
  font-size: clamp(1.12rem, 1.45vw, 1.42rem);
  line-height: 1.05;
  letter-spacing: -0.02em;
  color: rgba(31, 31, 27, 0.78);
  max-width: 16rem;
  justify-self: end;
  text-wrap: balance;
}

.boundary-scene {
  position: relative;
  border: var(--border-strong);
  border-radius: calc(var(--radius-card) + 4px);
  background:
    linear-gradient(180deg, rgba(255, 255, 255, 0.24), rgba(255, 255, 255, 0.1)),
    rgba(245, 241, 232, 0.48);
  padding: var(--space-16);
  display: grid;
  gap: var(--space-16);
}

.scene-toolbar {
  display: flex;
  justify-content: space-between;
  align-items: center;
  gap: var(--space-12);
  flex-wrap: wrap;
}

.scene-kicker {
  display: flex;
  gap: var(--space-8);
  flex-wrap: wrap;
}

.scene-metrics {
  display: grid;
  grid-template-columns: repeat(4, minmax(0, 1fr));
  gap: var(--space-12);
  margin: 0;
}

.scene-caption {
  margin: 0;
  font-family: var(--font-mono);
  font-size: var(--text-meta);
  color: var(--color-muted);
  letter-spacing: 0.06em;
  text-transform: uppercase;
  white-space: nowrap;
}

.scene-stat {
  margin: 0;
  padding: var(--space-12) var(--space-16);
  border: var(--border-default);
  border-radius: 8px;
  background: rgba(255, 255, 255, 0.24);
}

.scene-stat dt {
  margin: 0;
  font-family: var(--font-mono);
  font-size: var(--text-meta);
  color: var(--color-muted);
  text-transform: uppercase;
  letter-spacing: 0.04em;
}

.scene-stat dd {
  margin: var(--space-8) 0 0;
  font-family: var(--font-mono);
  font-size: 1.08rem;
  font-weight: 560;
  line-height: 1.1;
}

.scene-stat-risk {
  border-color: rgba(143, 59, 36, 0.32);
  background: rgba(143, 59, 36, 0.08);
}

.scene-stat-contained {
  border-color: rgba(31, 92, 86, 0.32);
  background: rgba(31, 92, 86, 0.08);
}

.chip-row,
.state-switches,
.metric-pills {
  display: flex;
  gap: var(--space-8);
  flex-wrap: wrap;
}

.chip,
.switch {
  border: var(--border-default);
  background: rgba(255, 255, 255, 0.28);
  border-radius: var(--radius-chip);
  padding: 0.42rem 0.8rem;
  font-family: var(--font-mono);
  font-size: var(--text-meta);
  line-height: 1;
  letter-spacing: 0.02em;
}

.chip-risk {
  color: var(--color-risk);
  background: var(--color-risk-soft);
}

.chip-contained {
  color: var(--color-contained);
  background: var(--color-contained-soft);
}

.state-switches {
  justify-content: flex-end;
}

.switch {
  cursor: pointer;
  transition:
    background var(--dur-base) var(--ease-standard),
    color var(--dur-base) var(--ease-standard),
    border-color var(--dur-base) var(--ease-standard);
}

.switch[aria-pressed="true"] {
  background: var(--color-ink);
  color: var(--color-page);
  border-color: var(--color-ink);
}

.boundary-grid {
  display: grid;
  grid-template-columns: var(--boundary-columns);
  gap: var(--space-12);
  align-items: start;
}

.panel {
  background: rgba(255, 255, 255, 0.34);
  border: var(--border-default);
  border-radius: var(--radius-card);
  box-shadow: var(--shadow-paper);
  padding: var(--space-20);
}

.panel-strong {
  background: rgba(234, 228, 216, 0.92);
  border: 2px solid var(--color-ink);
  padding-top: var(--space-24);
  transform: translateY(-0.35rem);
}

.panel-strong .panel-title {
  font-size: 1.68rem;
}

.panel-strong .rail-box {
  background: rgba(255, 255, 255, 0.42);
}

.panel-header {
  display: flex;
  justify-content: space-between;
  align-items: start;
  gap: var(--space-12);
  margin-bottom: var(--space-16);
}

.panel-title {
  margin: 0;
  font-size: var(--text-title-sm);
  line-height: 1.15;
}

.panel-meta {
  margin: var(--space-8) 0 0;
  font-family: var(--font-mono);
  font-size: var(--text-meta);
  color: var(--color-muted);
}

.file-list,
.signal-list,
.intent-list,
.artifact-list,
.mini-list {
  list-style: none;
  padding: 0;
  margin: 0;
}

.file-list {
  display: grid;
  gap: var(--space-8);
}

.file-row {
  display: grid;
  grid-template-columns: 1fr auto;
  gap: var(--space-8);
  align-items: center;
  padding: var(--space-12);
  border: var(--border-default);
  border-radius: 8px;
  background: rgba(255, 255, 255, 0.42);
  font-family: var(--font-mono);
  font-size: var(--text-mono);
  line-height: var(--leading-mono);
}

.file-row.is-risk {
  border-color: rgba(143, 59, 36, 0.38);
  background: rgba(143, 59, 36, 0.08);
}

.file-row.is-contained {
  border-color: rgba(31, 92, 86, 0.4);
  background: rgba(31, 92, 86, 0.08);
}

.scope-summary {
  display: none;
  border-color: rgba(143, 59, 36, 0.34);
  background: rgba(143, 59, 36, 0.08);
}

.row-flag {
  font-size: var(--text-meta);
  letter-spacing: 0.03em;
  text-transform: uppercase;
}

.row-flag-risk {
  color: var(--color-risk);
}

.row-flag-contained {
  color: var(--color-contained);
}

.rail-stack,
.contained-stack {
  display: grid;
  gap: var(--space-16);
}

.rail-box,
.contained-box,
.note-card,
.conversation-card {
  border: var(--border-default);
  border-radius: 8px;
  padding: var(--space-16);
  background: rgba(255, 255, 255, 0.28);
}

.panel-foot {
  margin-top: var(--space-16);
}

.rail-label,
.box-label,
.artifact-label {
  margin: 0 0 var(--space-8);
  display: inline-flex;
  align-items: center;
  gap: 0.55rem;
  font-family: var(--font-mono);
  font-size: var(--text-meta);
  color: var(--color-muted);
  text-transform: uppercase;
  letter-spacing: 0.05em;
}

.rail-label::before,
.box-label::before,
.artifact-label::before {
  content: "][";
  font-family: var(--font-mono);
  font-size: 0.72rem;
  line-height: 1;
  letter-spacing: -0.2em;
  color: rgba(31, 92, 86, 0.88);
}

.scene-anchor {
  display: grid;
  grid-template-columns: 1fr auto 1fr;
  align-items: end;
  gap: var(--space-16);
  min-height: 5.7rem;
  margin-top: calc(var(--space-8) * -1);
  padding: var(--space-8) 0 0;
}

.scene-anchor-center {
  position: relative;
  z-index: 1;
  display: grid;
  justify-items: center;
  gap: 0;
}

.scene-anchor-mark {
  font-family: var(--font-mono);
  font-size: clamp(4rem, 9vw, 6.1rem);
  line-height: 0.8;
  color: rgba(31, 92, 86, 0.28);
  user-select: none;
}

.scene-anchor-mark-left {
  justify-self: start;
}

.scene-anchor-mark-right {
  justify-self: end;
}

.containment-seal {
  position: relative;
  display: grid;
  justify-items: center;
  gap: 0.18rem;
  min-width: 11.5rem;
  padding: 0.66rem 0.96rem 0.74rem;
  border: 1.5px solid rgba(31, 92, 86, 0.56);
  border-radius: 999px;
  background:
    linear-gradient(180deg, rgba(255, 255, 255, 0.4), rgba(255, 255, 255, 0.12)),
    rgba(245, 241, 232, 0.94);
  box-shadow: var(--shadow-paper);
  color: var(--color-contained);
  transform: translateY(0.36rem) rotate(-1.2deg);
}

.containment-seal::after {
  content: "";
  position: absolute;
  inset: 0.24rem;
  border: 1px dashed rgba(31, 92, 86, 0.22);
  border-radius: inherit;
  pointer-events: none;
}

.containment-seal-kicker,
.containment-seal-meta {
  font-family: var(--font-mono);
  font-size: 0.68rem;
  line-height: 1;
  letter-spacing: 0.08em;
  text-transform: uppercase;
}

.containment-seal-kicker {
  color: rgba(31, 92, 86, 0.74);
}

.containment-seal-value {
  font-family: var(--font-mono);
  font-size: 1rem;
  line-height: 1.05;
  letter-spacing: 0.02em;
  color: var(--color-ink);
}

.containment-seal-meta {
  color: rgba(31, 92, 86, 0.86);
}

.metric-grid {
  display: grid;
  gap: var(--space-12);
}

.metric {
  display: grid;
  gap: var(--space-2);
}

.metric dt {
  font-family: var(--font-mono);
  font-size: var(--text-meta);
  color: var(--color-muted);
}

.metric dd {
  margin: 0;
  font-family: var(--font-mono);
  font-size: 0.95rem;
  line-height: 1.25;
}

.mode-note {
  margin: 0;
  color: var(--color-muted);
  font-size: 0.96rem;
  max-width: var(--measure-rail);
}

.signal-list,
.intent-list,
.artifact-list {
  display: grid;
  gap: var(--space-10, 0.625rem);
}

.signal-list li,
.intent-list li,
.artifact-list li {
  position: relative;
  padding-left: 1rem;
}

.signal-list li::before,
.intent-list li::before,
.artifact-list li::before {
  content: "";
  position: absolute;
  left: 0;
  top: 0.55em;
  width: 0.38rem;
  height: 0.38rem;
  border-radius: 999px;
  background: var(--color-ink);
}

.signal-list .risk::before {
  background: var(--color-risk);
}

.artifact-list .contained::before,
.intent-list .contained::before {
  background: var(--color-contained);
}

.boundary-strip {
  display: grid;
  grid-template-columns: repeat(4, 1fr);
  gap: var(--space-12);
  border-top: var(--border-default);
  padding-top: var(--space-20);
}

.strip-cell {
  padding-top: var(--space-4);
}

.strip-cell dt {
  margin: 0;
  font-family: var(--font-mono);
  font-size: var(--text-meta);
  color: var(--color-muted);
}

.strip-cell dd {
  margin: var(--space-8) 0 0;
  font-size: 0.98rem;
}

.section-header {
  display: grid;
  grid-template-columns: minmax(0, 1fr) minmax(18rem, 28rem);
  align-items: end;
  gap: var(--space-16) var(--space-24);
  margin-bottom: var(--space-24);
}

.section-header > .section-kicker {
  grid-column: 1 / -1;
  margin-bottom: 0;
}

.editorial-title {
  margin: 0;
  max-width: 13ch;
  font-family: var(--font-editorial);
  font-size: var(--text-title-lg);
  line-height: 1;
  font-weight: 500;
  letter-spacing: -0.03em;
  text-wrap: balance;
}

.section-copy {
  margin: 0;
  justify-self: end;
  align-self: end;
  color: var(--color-muted);
  max-width: 28rem;
  font-size: 0.98rem;
}

.artifact-stack {
  display: grid;
  gap: var(--space-12);
}

.notebook-log {
  display: grid;
  gap: var(--space-12);
}

.log-entry {
  display: grid;
  grid-template-columns: minmax(10rem, 0.36fr) minmax(0, 1fr);
  gap: var(--space-24);
  padding: 1.1rem 0;
  border-bottom: var(--border-default);
}

.log-entry-featured {
  padding-top: var(--space-8);
}

.log-meta {
  display: grid;
  align-content: start;
  gap: var(--space-8);
  padding-top: var(--space-4);
}

.log-body {
  max-width: 42rem;
}

.log-status {
  margin: 0;
  font-family: var(--font-mono);
  font-size: var(--text-meta);
  color: var(--color-muted);
}

.note-title {
  margin: 0 0 var(--space-12);
  font-family: var(--font-editorial);
  font-size: 1.55rem;
  line-height: 1.06;
  font-weight: 500;
  text-wrap: balance;
}

.log-entry-featured .note-title {
  font-size: 1.7rem;
}

.note-copy {
  margin: 0;
  color: var(--color-muted);
}

.note-meta {
  font-family: var(--font-mono);
  font-size: var(--text-meta);
  color: var(--color-muted);
  text-transform: uppercase;
  letter-spacing: 0.06em;
}

.artifact-card {
  border: var(--border-default);
  border-radius: 12px;
  background: rgba(255, 255, 255, 0.28);
  overflow: hidden;
}

.artifact-card summary {
  list-style: none;
  cursor: pointer;
  padding: 1.1rem 1.25rem;
  display: grid;
  grid-template-columns: minmax(7rem, 0.34fr) minmax(0, 1fr);
  gap: var(--space-20);
  align-items: start;
}

.artifact-card summary::-webkit-details-marker {
  display: none;
}

.artifact-card[open] summary {
  border-bottom: var(--border-default);
  background: rgba(225, 215, 197, 0.42);
}

.artifact-body {
  padding: 1rem 1.25rem 1.2rem;
  display: grid;
  gap: var(--space-12);
}

.artifact-name {
  margin: 0;
  font-family: var(--font-mono);
  font-size: 1rem;
  line-height: 1.15;
}

.artifact-copy {
  margin: 0;
  color: var(--color-muted);
  max-width: 44ch;
}

pre {
  margin: 0;
  overflow: auto;
  padding: 0.95rem 1rem;
  border-radius: 8px;
  background: rgba(255, 255, 255, 0.44);
  border: var(--border-default);
  font-family: var(--font-mono);
  font-size: var(--text-mono);
  line-height: var(--leading-mono);
}

.conversation-sheet {
  display: grid;
  grid-template-columns: 1.18fr 0.82fr;
  gap: var(--space-16);
  border: var(--border-strong);
  border-radius: var(--radius-card);
  background: rgba(255, 255, 255, 0.22);
  overflow: hidden;
}

.conversation-pane {
  padding: var(--space-24);
}

.conversation-pane-aside {
  border-left: var(--border-default);
  background: rgba(225, 215, 197, 0.42);
}

.conversation-pane textarea {
  width: 100%;
  min-height: 10rem;
  resize: vertical;
  padding: var(--space-16);
  background: rgba(255, 255, 255, 0.36);
  border: var(--border-default);
  border-radius: 8px;
  color: var(--color-ink);
  font-family: var(--font-mono);
  font-size: var(--text-mono);
  line-height: 1.5;
}

.action-row {
  display: flex;
  gap: var(--space-12);
  flex-wrap: wrap;
}

.conversation-actions {
  margin-top: var(--space-16);
  padding-top: var(--space-12);
  border-top: var(--border-default);
}

.action {
  display: inline-flex;
  align-items: center;
  border: 0;
  border-bottom: 1.5px solid var(--color-ink);
  background: transparent;
  color: var(--color-ink);
  border-radius: 0;
  padding: 0 0 0.2rem;
  font-family: var(--font-mono);
  font-size: var(--text-meta);
  text-transform: uppercase;
  letter-spacing: 0.05em;
  text-decoration: none;
  cursor: pointer;
}

.action-secondary {
  color: var(--color-muted);
  border-bottom-color: var(--color-line);
}

.action:focus-visible,
.switch:focus-visible,
.artifact-card summary:focus-visible,
.conversation-pane textarea:focus-visible {
  outline: 2px solid rgba(31, 92, 86, 0.48);
  outline-offset: 3px;
}

.conversation-list {
  display: grid;
  gap: var(--space-12);
  margin: 0;
  padding-left: 1rem;
  color: var(--color-muted);
  font-size: 0.98rem;
}

.footer-note {
  margin-top: var(--space-20);
  padding-top: var(--space-12);
  border-top: var(--border-default);
  font-family: var(--font-mono);
  font-size: var(--text-meta);
  color: var(--color-muted);
}

.boundary-grid[data-mode="raw"] .file-row.is-risk,
.boundary-grid[data-mode="raw"] .signal-list .risk,
.boundary-grid[data-mode="raw"] .chip-risk {
  box-shadow: inset 0 0 0 1px rgba(143, 59, 36, 0.18);
}

.boundary-grid[data-mode="raw"] .panel-strong,
.boundary-grid[data-mode="raw"] .contained-state {
  opacity: 0.72;
}

.boundary-grid[data-mode="raw"] .scope-summary {
  display: none;
}

.boundary-grid[data-mode="scoped"] .file-row.is-risk,
.boundary-grid[data-mode="evidence"] .file-row.is-risk {
  display: none;
}

.boundary-grid[data-mode="scoped"] .scope-summary,
.boundary-grid[data-mode="evidence"] .scope-summary {
  display: grid;
}

.boundary-grid[data-mode="scoped"] .file-row.is-contained,
.boundary-grid[data-mode="scoped"] .chip-contained {
  box-shadow: inset 0 0 0 1px rgba(31, 92, 86, 0.18);
}

.boundary-grid[data-mode="scoped"] .risk-state-fade {
  opacity: 0.84;
}

.boundary-grid[data-mode="scoped"] .panel-strong {
  transform: translateY(-0.5rem);
}

.boundary-grid[data-mode="evidence"] .rail-box.is-evidence,
.boundary-grid[data-mode="evidence"] .contained-box.is-evidence {
  background: rgba(31, 92, 86, 0.09);
  border-color: rgba(31, 92, 86, 0.4);
  transform: translateY(-0.2rem);
}

.boundary-grid[data-mode="evidence"] .file-row,
.boundary-grid[data-mode="evidence"] .contained-box:not(.is-evidence) {
  opacity: 0.78;
}

.boundary-grid[data-mode="evidence"] .panel-strong {
  transform: translateY(-0.6rem);
}

.panel,
.switch,
.artifact-card,
.conversation-card,
.rail-box,
.contained-box,
.note-card,
.file-row {
  transition:
    background var(--dur-base) var(--ease-standard),
    border-color var(--dur-base) var(--ease-standard),
    opacity var(--dur-fast) var(--ease-standard),
    transform var(--dur-base) var(--ease-standard);
}

@media (max-width: 1080px) {
  .scene-metrics {
    grid-template-columns: repeat(2, minmax(0, 1fr));
  }

  .boundary-grid,
  .conversation-sheet {
    grid-template-columns: 1fr;
  }

  .section-header {
    grid-template-columns: 1fr;
  }

  .section-copy {
    justify-self: start;
    max-width: 34rem;
  }

  .boundary-head {
    grid-template-columns: 1fr;
    gap: var(--space-16);
  }

  .boundary-subcopy--editorial {
    justify-self: start;
    max-width: 22rem;
  }

  .log-entry,
  .artifact-card summary {
    grid-template-columns: 1fr;
  }

  .boundary-strip {
    grid-template-columns: repeat(2, minmax(0, 1fr));
  }

  .scene-anchor {
    gap: var(--space-10, 0.625rem);
  }

  .containment-seal {
    transform: translateY(0.3rem) rotate(-1deg);
  }
}

@media (max-width: 760px) {
  .topbar-inner {
    grid-template-columns: 1fr;
    gap: var(--space-12);
  }

  .topnav {
    justify-content: start;
    gap: var(--space-12);
    padding-top: var(--space-8);
    border-top: var(--border-default);
  }

  .topnav a,
  .topbar-note {
    font-size: 0.68rem;
    letter-spacing: 0.03em;
  }

  .page-shell {
    width: min(100% - 1rem, var(--page-max));
  }

  .conversation-pane-aside {
    border-left: 0;
    border-top: var(--border-default);
  }

  .boundary-section {
    padding-top: var(--space-24);
    min-height: auto;
  }

  .section:not(.boundary-section) {
    margin-top: var(--space-24);
    padding-top: var(--space-24);
  }

  .panel,
  .panel-strong {
    padding: var(--space-16);
  }

  .scene-toolbar {
    align-items: start;
  }

  .state-switches {
    width: 100%;
    justify-content: start;
  }

  .premise {
    max-width: 12ch;
  }

  .scene-anchor {
    min-height: auto;
    gap: var(--space-8);
  }

  .scene-anchor-center {
    gap: 0;
  }

  .scene-anchor-mark {
    font-size: 3rem;
  }

  .containment-seal {
    min-width: auto;
    padding: 0.58rem 0.8rem 0.66rem;
    transform: translateY(0.18rem) rotate(-0.8deg);
  }

  .editorial-title {
    max-width: 14ch;
  }

  .section-copy {
    font-size: 0.94rem;
    max-width: none;
  }

  .conversation-pane {
    padding: var(--space-16);
  }

  .boundary-strip {
    grid-template-columns: 1fr;
  }
}

@media (max-width: 480px) {
  .scene-metrics {
    grid-template-columns: 1fr;
  }

  .scene-caption {
    white-space: normal;
  }
}

@media (prefers-reduced-motion: reduce) {
  html {
    scroll-behavior: auto;
  }

  *,
  *::before,
  *::after {
    animation: none !important;
    transition-duration: 1ms !important;
    transition-delay: 0ms !important;
  }
}