:root {
  color-scheme: dark;
  --geometry-bg: #06131d;
  --geometry-panel: #0a1e2b;
  --geometry-ink: #edfaff;
  --geometry-muted: #98bdce;
  --geometry-line: rgba(153, 217, 239, 0.2);
  --geometry-inside: #3ee6ad;
  --geometry-outside: #ff9b55;
  --geometry-relation: #5eead4;
  --geometry-history: #c4a7ff;
  --geometry-gold: #ffe480;
}

* {
  box-sizing: border-box;
}

.geometry-body {
  min-height: 100vh;
  min-height: 100svh;
  overflow: hidden;
  background: var(--geometry-bg);
}

.geometry-deck {
  position: relative;
  display: grid;
  grid-template-columns: minmax(0, 58fr) minmax(360px, 42fr);
  height: 100vh;
  height: 100svh;
  min-height: 100vh;
  min-height: 100svh;
  color: var(--geometry-ink);
  background:
    radial-gradient(circle at 17% 18%, rgba(19, 87, 108, 0.25), transparent 36%),
    linear-gradient(135deg, #06131d, #091d2b 58%, #07151f);
}

.geometry-stage {
  position: relative;
  min-width: 0;
  min-height: 100vh;
  min-height: 100svh;
  overflow: hidden;
  border-right: 1px solid var(--geometry-line);
}

#geometryCanvas {
  width: 100%;
  height: 100%;
  display: block;
  touch-action: pan-y;
}

.geometry-brand,
.geometry-stage-footer {
  position: absolute;
  z-index: 2;
  left: clamp(14px, 2.2vw, 32px);
  right: clamp(14px, 2.2vw, 32px);
  display: flex;
  align-items: center;
  gap: 9px;
  pointer-events: none;
}

.geometry-brand {
  top: max(16px, env(safe-area-inset-top));
  color: var(--geometry-muted);
  font-size: 0.76rem;
  letter-spacing: 0.08em;
  text-transform: uppercase;
}

.geometry-brand strong {
  color: var(--geometry-relation);
}

.geometry-back,
.geometry-stage-footer button,
.matrix-stage-actions,
.matrix-stage-actions select {
  pointer-events: auto;
}

.geometry-back {
  color: inherit;
  text-decoration: none;
}

.geometry-back:hover,
.geometry-back:focus-visible {
  color: var(--geometry-ink);
}

.geometry-stage-footer {
  bottom: max(16px, env(safe-area-inset-bottom));
  justify-content: space-between;
  font-size: 0.76rem;
  color: var(--geometry-muted);
}

.geometry-stage-footer > span {
  min-width: 0;
  overflow: hidden;
  text-overflow: ellipsis;
  white-space: nowrap;
}

.matrix-stage-actions {
  display: flex;
  align-items: center;
  justify-content: flex-end;
  gap: 8px;
}

.matrix-stage-actions label {
  display: flex;
  align-items: center;
  gap: 6px;
  color: var(--geometry-muted);
  font-size: 0.66rem;
  letter-spacing: 0.02em;
  white-space: nowrap;
}

.matrix-stage-actions select {
  max-width: 150px;
  padding: 6px 24px 6px 8px;
  border: 1px solid var(--geometry-line);
  border-radius: 999px;
  background: rgba(5, 18, 27, 0.92);
  color: var(--geometry-ink);
  font: inherit;
}

.geometry-stage-footer button,
.geometry-map-button,
.geometry-map-head button,
.geometry-controls button {
  width: auto;
  flex: 0 0 auto;
  border: 1px solid var(--geometry-line);
  background: rgba(5, 18, 27, 0.78);
  color: var(--geometry-ink);
  cursor: pointer;
}

.geometry-stage-footer button {
  padding: 7px 10px;
  border-radius: 999px;
  font-size: 0.7rem;
}

.geometry-reader {
  position: relative;
  min-width: 0;
  height: 100vh;
  height: 100svh;
  min-height: 100vh;
  min-height: 100svh;
  display: grid;
  grid-template-rows: auto auto minmax(0, 1fr) auto auto;
  overflow: hidden;
  background: rgba(5, 16, 24, 0.48);
}

.geometry-progress {
  height: 3px;
  background: rgba(255, 255, 255, 0.06);
}

.geometry-progress span {
  display: block;
  width: 0;
  height: 100%;
  background: linear-gradient(90deg, var(--geometry-relation), var(--geometry-gold));
  transition: width 220ms ease;
}

.geometry-reader-header {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 16px;
  padding: max(18px, env(safe-area-inset-top)) clamp(22px, 4vw, 54px) 12px;
}

.geometry-step-line {
  display: flex;
  flex-wrap: wrap;
  gap: 8px 16px;
  color: var(--geometry-muted);
  font: 700 0.68rem/1.2 ui-monospace, SFMono-Regular, Consolas, monospace;
  letter-spacing: 0.08em;
  text-transform: uppercase;
}

.geometry-map-button,
.geometry-map-head button {
  padding: 8px 11px;
  border-radius: 9px;
  font-size: 0.72rem;
}

.geometry-slide {
  align-self: center;
  min-height: 0;
  max-height: 100%;
  overflow-y: auto;
  overscroll-behavior: contain;
  padding: 4vh clamp(22px, 4vw, 54px);
  scrollbar-width: thin;
}

.geometry-chapter-title {
  margin: 0 0 16px;
  color: var(--geometry-relation);
  font-size: 0.72rem;
  font-weight: 800;
  letter-spacing: 0.12em;
  text-transform: uppercase;
}

.geometry-slide h1 {
  max-width: 15ch;
  margin: 0 0 24px;
  font-size: clamp(2rem, 4vw, 4.7rem);
  line-height: 0.98;
  letter-spacing: -0.04em;
  text-wrap: balance;
}

.geometry-copy {
  max-width: 48ch;
  color: var(--geometry-ink);
  font-size: clamp(1rem, 1.45vw, 1.23rem);
  line-height: 1.65;
}

.geometry-copy p {
  margin: 0 0 1em;
}

.geometry-copy strong {
  color: #fff;
}

.geometry-equation {
  width: fit-content;
  max-width: 100%;
  margin: 24px 0 0;
  padding: 12px 15px;
  overflow-x: auto;
  border-left: 2px solid var(--geometry-gold);
  background: rgba(255, 228, 128, 0.06);
  color: #fff0ae;
  font: 600 clamp(0.86rem, 1.25vw, 1.05rem)/1.5 ui-monospace, SFMono-Regular, Consolas, monospace;
  white-space: pre-wrap;
}

.geometry-carry {
  max-width: 48ch;
  margin: 26px 0 0;
  padding-top: 16px;
  border-top: 1px solid var(--geometry-line);
  color: var(--geometry-muted);
  font-size: 0.88rem;
  line-height: 1.55;
}

.geometry-carry::before {
  content: "Carries forward: ";
  color: var(--geometry-relation);
  font-weight: 800;
}

.geometry-source {
  max-width: 48ch;
  margin-top: 20px;
  color: var(--geometry-muted);
  font-size: 0.76rem;
  line-height: 1.5;
}

.geometry-source summary {
  width: fit-content;
  cursor: pointer;
  color: #b8d5e2;
}

.geometry-source p {
  margin: 10px 0 0;
}

.matrix-inspector-grid {
  display: grid;
  grid-template-columns: repeat(2, minmax(0, 1fr));
  gap: 8px;
  margin: 14px 0 0;
}

.matrix-inspector-grid div,
.matrix-claim-axes div {
  min-width: 0;
  padding: 9px 10px;
  border: 1px solid var(--geometry-line);
  border-radius: 8px;
  background: rgba(8, 34, 48, 0.5);
}

.matrix-inspector-grid dt,
.matrix-claim-axes span {
  display: block;
  margin-bottom: 4px;
  color: var(--geometry-relation);
  font-size: 0.62rem;
  font-weight: 800;
  letter-spacing: 0.08em;
  text-transform: uppercase;
}

.matrix-inspector-grid dd {
  margin: 0;
  overflow-wrap: anywhere;
  color: #d8edf5;
}

.matrix-claim-axes {
  display: grid;
  grid-template-columns: repeat(5, minmax(0, 1fr));
  gap: 6px;
  margin-top: 10px;
}

.matrix-claim-axes div {
  padding: 8px;
}

.matrix-claim-axes strong {
  display: block;
  overflow-wrap: anywhere;
  color: var(--geometry-ink);
  font-size: 0.68rem;
  font-weight: 600;
  line-height: 1.35;
}

.matrix-resolution-line {
  color: #cce5ee;
}

.geometry-controls {
  display: grid;
  grid-template-columns: auto minmax(80px, 1fr) auto;
  align-items: center;
  gap: 14px;
  padding: 12px clamp(22px, 4vw, 54px) 8px;
}

.geometry-controls button {
  min-width: 88px;
  padding: 10px 15px;
  border-radius: 10px;
}

.geometry-controls button:hover:not(:disabled),
.geometry-controls button:focus-visible,
.geometry-map-button:hover,
.geometry-map-button:focus-visible,
.geometry-map-head button:hover,
.geometry-map-head button:focus-visible {
  border-color: var(--geometry-relation);
  color: var(--geometry-relation);
}

.geometry-controls button:disabled {
  opacity: 0.28;
  cursor: default;
}

.geometry-slider-label,
#geometrySlider {
  width: 100%;
}

#geometrySlider {
  accent-color: var(--geometry-relation);
}

.geometry-hint {
  margin: 0;
  padding: 0 clamp(22px, 4vw, 54px) max(16px, env(safe-area-inset-bottom));
  color: rgba(152, 189, 206, 0.72);
  font-size: 0.7rem;
  text-align: center;
}

.geometry-map {
  position: fixed;
  z-index: 30;
  inset: 0 0 0 auto;
  width: min(480px, 100%);
  overflow-y: auto;
  padding: max(20px, env(safe-area-inset-top)) 24px max(24px, env(safe-area-inset-bottom));
  border-left: 1px solid var(--geometry-line);
  background: rgba(5, 17, 25, 0.97);
  box-shadow: -24px 0 60px rgba(0, 0, 0, 0.35);
}

.geometry-map[hidden] {
  display: none;
}

.geometry-map-head {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 14px;
  margin-bottom: 24px;
}

.geometry-map-head span,
.geometry-map-head strong {
  display: block;
}

.geometry-map-head span {
  margin-bottom: 5px;
  color: var(--geometry-muted);
  font-size: 0.72rem;
  text-transform: uppercase;
  letter-spacing: 0.1em;
}

.geometry-map-head strong {
  font-size: 1.15rem;
}

#geometryChapterMap {
  display: grid;
  gap: 8px;
}

.geometry-map-search {
  display: grid;
  gap: 7px;
  margin-bottom: 16px;
  color: var(--geometry-muted);
  font-size: 0.72rem;
}

.geometry-map-search input {
  width: 100%;
  min-width: 0;
  padding: 11px 13px;
  border: 1px solid var(--geometry-line);
  border-radius: 10px;
  outline: none;
  background: rgba(255, 255, 255, 0.035);
  color: var(--geometry-ink);
  font: inherit;
}

.geometry-map-search input:focus {
  border-color: var(--geometry-relation);
  box-shadow: 0 0 0 2px rgba(94, 234, 212, 0.12);
}

.geometry-map-results {
  display: grid;
  gap: 7px;
}

.geometry-map-results[hidden] {
  display: none;
}

.geometry-map-result {
  display: grid;
  grid-template-columns: 42px minmax(0, 1fr);
  align-items: start;
  gap: 10px;
  width: 100%;
  padding: 11px 12px;
  border: 1px solid transparent;
  border-radius: 10px;
  background: rgba(255, 255, 255, 0.025);
  color: var(--geometry-ink);
  text-align: left;
  cursor: pointer;
}

.geometry-map-result:hover,
.geometry-map-result:focus-visible {
  border-color: rgba(94, 234, 212, 0.42);
  background: rgba(94, 234, 212, 0.06);
}

.geometry-map-result strong,
.geometry-map-result small {
  display: block;
  overflow-wrap: anywhere;
}

.geometry-map-result strong {
  font-size: 0.82rem;
}

.geometry-map-result small {
  margin-top: 4px;
  color: var(--geometry-muted);
  font-size: 0.65rem;
}

.geometry-map-item {
  display: grid;
  grid-template-columns: 42px minmax(0, 1fr) auto;
  align-items: center;
  gap: 12px;
  width: 100%;
  padding: 12px;
  border: 1px solid transparent;
  border-radius: 12px;
  background: rgba(255, 255, 255, 0.025);
  color: var(--geometry-ink);
  text-align: left;
  cursor: pointer;
}

.geometry-map-item:hover,
.geometry-map-item.is-active {
  border-color: rgba(94, 234, 212, 0.42);
  background: rgba(94, 234, 212, 0.06);
}

.geometry-map-index,
.geometry-map-range {
  color: var(--geometry-muted);
  font: 700 0.68rem/1 ui-monospace, SFMono-Regular, Consolas, monospace;
}

.geometry-map-title {
  min-width: 0;
  font-size: 0.88rem;
}

.geometry-map-links {
  display: grid;
  gap: 9px;
  margin-top: 26px;
  padding-top: 20px;
  border-top: 1px solid var(--geometry-line);
}

.geometry-map-links a {
  color: var(--geometry-muted);
  font-size: 0.78rem;
}

.sr-only {
  position: absolute;
  width: 1px;
  height: 1px;
  padding: 0;
  margin: -1px;
  overflow: hidden;
  clip: rect(0, 0, 0, 0);
  white-space: nowrap;
  border: 0;
}

@media (max-width: 820px) {
  .geometry-body {
    overflow: hidden;
  }

  .geometry-deck {
    display: grid;
    grid-template-columns: minmax(0, 1fr);
    grid-template-rows: clamp(190px, 34svh, 300px) minmax(0, 1fr);
    height: 100vh;
    height: 100svh;
    min-height: 100svh;
    overflow: hidden;
  }

  .geometry-stage {
    position: relative;
    z-index: auto;
    display: grid;
    grid-template-rows: auto minmax(0, 1fr) auto;
    width: 100%;
    min-height: 0;
    height: auto;
    overflow: hidden;
    border-right: 0;
    border-bottom: 1px solid var(--geometry-line);
    background: var(--geometry-bg);
  }

  #geometryCanvas {
    min-width: 0;
    min-height: 0;
  }

  .geometry-brand,
  .geometry-stage-footer {
    position: relative;
    inset: auto;
    min-width: 0;
  }

  .geometry-brand {
    padding: max(11px, env(safe-area-inset-top)) 14px 5px;
    font-size: 0.65rem;
  }

  .geometry-stage-footer {
    padding: 5px 14px max(10px, env(safe-area-inset-bottom));
    font-size: 0.66rem;
  }

  .matrix-stage-actions label {
    font-size: 0.6rem;
  }

  .matrix-stage-actions select {
    max-width: 132px;
    padding-block: 5px;
  }

  .geometry-stage-footer button {
    padding: 6px 9px;
  }

  .geometry-reader {
    height: auto;
    min-height: 0;
    grid-template-rows: auto auto minmax(0, 1fr) auto auto;
    overflow: hidden;
    background: #071720;
  }

  .geometry-reader-header {
    padding: 17px 18px 6px;
  }

  .geometry-slide {
    align-self: stretch;
    min-height: 0;
    max-height: none;
    overflow-x: hidden;
    overflow-y: auto;
    padding: 22px 18px 24px;
    -webkit-overflow-scrolling: touch;
  }

  .geometry-slide h1 {
    max-width: 17ch;
    font-size: clamp(2rem, 10vw, 3.2rem);
  }

  .geometry-copy {
    font-size: 1rem;
    line-height: 1.62;
  }

  .geometry-controls {
    position: relative;
    z-index: auto;
    bottom: auto;
    padding: 10px 12px max(10px, env(safe-area-inset-bottom));
    background: rgba(5, 17, 25, 0.96);
    border-top: 1px solid var(--geometry-line);
  }

  .geometry-controls button {
    min-width: 76px;
    padding: 9px 11px;
    font-size: 0.78rem;
  }

  .geometry-hint {
    display: none;
  }
}

@media (max-width: 460px) {
  .geometry-deck {
    grid-template-rows: clamp(180px, 31svh, 220px) minmax(0, 1fr);
  }

  .geometry-stage-footer > span {
    display: none;
  }

  .matrix-stage-actions {
    width: 100%;
    justify-content: space-between;
    flex-wrap: wrap;
    gap: 6px;
  }

  .matrix-stage-actions label {
    flex: 1 1 168px;
    min-width: 0;
  }

  .matrix-stage-actions select {
    width: 100%;
    min-width: 0;
    max-width: none;
  }

  .matrix-stage-actions button {
    flex: 0 1 auto;
    min-width: 0;
  }

  .matrix-inspector-grid {
    grid-template-columns: minmax(0, 1fr);
  }

  .matrix-claim-axes {
    grid-template-columns: repeat(2, minmax(0, 1fr));
  }

  .geometry-reader {
    min-height: 0;
  }

  .geometry-step-line {
    display: grid;
    gap: 3px;
  }

  .geometry-map-button {
    padding: 7px 9px;
  }

  .geometry-slide h1 {
    margin-bottom: 18px;
  }

  .geometry-equation {
    font-size: 0.78rem;
  }
}

@media (max-width: 820px) and (max-height: 500px) and (orientation: landscape) {
  .geometry-deck {
    grid-template-columns: minmax(0, 48fr) minmax(0, 52fr);
    grid-template-rows: minmax(0, 1fr);
  }

  .geometry-stage {
    display: grid;
    grid-template-rows: auto minmax(0, 1fr) auto;
    height: 100vh;
    height: 100svh;
    border-right: 1px solid var(--geometry-line);
    border-bottom: 0;
  }

  #geometryCanvas {
    position: relative;
    inset: auto;
    width: 100%;
    height: 100%;
  }

  .geometry-brand,
  .geometry-stage-footer {
    position: relative;
    inset: auto;
    z-index: 2;
  }

  .geometry-brand {
    padding: max(8px, env(safe-area-inset-top)) 12px 3px;
  }

  .geometry-stage-footer {
    padding: 3px 12px max(8px, env(safe-area-inset-bottom));
  }

  .geometry-reader {
    height: 100vh;
    height: 100svh;
  }

  .geometry-reader-header {
    padding: 10px 12px 4px;
  }

  .geometry-slide {
    padding: 10px 12px 12px;
  }

  .geometry-chapter-title {
    margin-bottom: 6px;
    font-size: 0.58rem;
  }

  .geometry-slide h1 {
    max-width: 20ch;
    margin-bottom: 10px;
    font-size: clamp(1.35rem, 3.8vw, 2rem);
    line-height: 1;
  }

  .geometry-copy {
    font-size: 0.82rem;
    line-height: 1.38;
  }

  .geometry-copy p {
    margin-bottom: 0.65em;
  }

  .geometry-equation {
    margin-top: 10px;
    padding: 7px 9px;
    font-size: 0.68rem;
  }

  .geometry-carry {
    margin-top: 10px;
    padding-top: 8px;
    font-size: 0.7rem;
    line-height: 1.35;
  }

  .geometry-source {
    margin-top: 8px;
    font-size: 0.64rem;
  }

  .geometry-controls {
    gap: 8px;
    padding: 6px 10px max(6px, env(safe-area-inset-bottom));
  }

  .geometry-controls button {
    min-width: 68px;
    padding: 6px 8px;
    font-size: 0.7rem;
  }
}

@media (prefers-reduced-motion: reduce) {
  .geometry-progress span {
    transition: none;
  }
}