:root {
  color-scheme: light;
  --paper: #f5f5ef;
  --ink: #26392d;
  --muted: #63705f;
  --line: #d9ddd5;
  --dream: #347eae;
}
* {
  box-sizing: border-box;
}
body {
  margin: 0;
  background: var(--paper);
  color: var(--ink);
  font-family:
    system-ui,
    -apple-system,
    BlinkMacSystemFont,
    "Segoe UI",
    sans-serif;
}
a {
  color: inherit;
  text-underline-offset: 4px;
}
button,
input,
summary {
  -webkit-tap-highlight-color: transparent;
}
button {
  font: inherit;
  font-size: 13px;
  cursor: pointer;
  min-height: 46px;
  padding: 10px 18px;
  border: 1px solid var(--line);
  border-radius: 5px;
  color: var(--ink);
  background: transparent;
  touch-action: manipulation;
}
button:hover {
  background: #e6eade;
  border-color: #a1a79d;
}
button:active {
  transform: translateY(1px);
}
button:disabled {
  opacity: 0.45;
  cursor: wait;
}
button:focus-visible,
a:focus-visible,
summary:focus-visible,
input:focus-visible {
  outline: 2px solid var(--dream);
  outline-offset: 4px;
}
button[aria-pressed="true"] {
  background: #e4edf0;
  color: #235a7d;
  border-color: #a6c8da;
}
.app {
  max-width: 1240px;
  margin: auto;
  padding: 0 40px;
}
.masthead {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 20px;
  height: 78px;
  border-bottom: 1px solid var(--line);
}
.brand {
  text-decoration: none;
  font-weight: 800;
  letter-spacing: -1px;
  font-size: 22px;
  white-space: nowrap;
}
.brand span {
  font-size: 12px;
  letter-spacing: 1px;
  font-weight: 500;
  margin-left: 6px;
}
.eyebrow,
#status,
footer,
.scene-labels,
.force-control label,
.belief-flow,
.keyboard-hint {
  font:
    10px ui-monospace,
    SFMono-Regular,
    Consolas,
    monospace;
  letter-spacing: 1px;
}
.eyebrow {
  color: var(--muted);
}
#status {
  color: var(--muted);
  letter-spacing: 0;
}
.intro {
  display: flex;
  justify-content: space-between;
  align-items: center;
  gap: 24px;
  padding: 28px 0;
}
h1 {
  font-size: clamp(32px, 4vw, 48px);
  margin: 0;
  font-weight: 650;
  line-height: 1.1;
  letter-spacing: -2px;
}
h1 span {
  color: var(--dream);
}
.intro p {
  font-size: 14px;
  margin: 12px 0 0;
  color: var(--muted);
}
.intro .invitation {
  margin: 0;
  text-align: right;
  font-size: 13px;
  line-height: 1.7;
}
.experiment {
  border: 1px solid var(--line);
  border-radius: 8px;
  display: grid;
  grid-template-columns: minmax(0, 1fr) 270px;
  overflow: hidden;
}
.scene-wrap {
  min-width: 0;
  padding: 20px;
  background: #eff1e9;
}
.scene-labels {
  display: flex;
  justify-content: space-between;
  gap: 12px;
  letter-spacing: 0.7px;
}
.scene-labels span {
  display: flex;
  gap: 8px;
  align-items: center;
  white-space: nowrap;
}
.scene-labels small {
  font:
    11px system-ui,
    sans-serif;
  color: var(--muted);
  letter-spacing: 0;
}
.scene-labels i {
  display: block;
  width: 7px;
  height: 7px;
  border-radius: 50%;
}
.solid-key {
  background: var(--ink);
}
.dream-key {
  background: var(--dream);
  opacity: 0.6;
}
canvas {
  display: block;
  width: 100%;
  height: clamp(280px, 43vh, 440px);
}
.push-controls {
  display: grid;
  grid-template-columns: 1fr 1fr 1fr;
  align-items: center;
  gap: 20px;
}
.push-controls button {
  background: var(--ink);
  color: var(--paper);
  border-color: var(--ink);
  font-weight: 550;
  min-height: 52px;
}
.push-controls button:hover {
  background: #3c5342;
}
.push-controls button span {
  font-size: 19px;
  padding: 0 6px;
}
.force-control label {
  display: flex;
  justify-content: space-between;
  color: var(--muted);
  letter-spacing: 0.3px;
  font-size: 9px;
  gap: 6px;
}
.force-control output {
  color: var(--ink);
  white-space: nowrap;
}
input[type="range"] {
  accent-color: var(--ink);
  width: 100%;
  min-height: 44px;
  margin: 0;
  cursor: pointer;
}
.model-panel {
  border-left: 1px solid var(--line);
  padding: 26px;
}
h2 {
  font-size: 23px;
  font-weight: 550;
  letter-spacing: -0.8px;
  margin: 17px 0 12px;
}
.panel-note,
.small-note {
  color: var(--muted);
  font-size: 12px;
  line-height: 1.7;
}
.metrics {
  margin: 24px 0;
}
.metrics > div {
  display: flex;
  justify-content: space-between;
  gap: 12px;
  align-items: center;
  padding: 13px 0;
  border-top: 1px solid var(--line);
}
dt {
  font-size: 12px;
  line-height: 1.8;
}
dt small {
  display: block;
  font-size: 10px;
  color: var(--muted);
}
dd {
  font:
    21px ui-monospace,
    monospace;
  margin: 0;
}
.belief-flow {
  color: var(--muted);
  letter-spacing: 0;
  line-height: 2;
  margin-top: 20px;
}
.belief-flow b {
  padding: 0 4px;
}
.belief-flow div {
  color: var(--dream);
  padding-left: 70px;
}
.small-note {
  font-size: 11px;
  margin-top: 18px;
}
.toolbar {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 16px;
  padding: 18px 0;
}
.buttons {
  display: flex;
  gap: 8px;
}
.keyboard-hint {
  letter-spacing: 0;
  color: var(--muted);
}
.explanation {
  border-top: 1px solid var(--line);
  border-bottom: 1px solid var(--line);
}
summary {
  cursor: pointer;
  font-size: 13px;
  padding: 18px 0;
  list-style: none;
  display: flex;
  justify-content: space-between;
  gap: 20px;
}
summary::-webkit-details-marker {
  display: none;
}
summary span {
  font-size: 18px;
  line-height: 1;
}
details[open] summary span {
  transform: rotate(45deg);
}
.explanation-content {
  max-width: 780px;
  padding: 0 0 16px;
  color: var(--muted);
  font-size: 13px;
  line-height: 1.8;
}
.explanation-content li {
  padding-left: 5px;
  margin: 7px 0;
}
.explanation-content a {
  margin-right: 22px;
  color: var(--ink);
}
footer {
  display: flex;
  justify-content: space-between;
  gap: 20px;
  padding: 22px 0;
  font-size: 9px;
  color: var(--muted);
  letter-spacing: 0.5px;
}
#error {
  background: #f4e6db;
  border: 1px solid #c35d32;
  border-radius: 5px;
  padding: 16px;
  font-size: 13px;
  line-height: 1.6;
}
[hidden] {
  display: none !important;
}
@media (max-width: 850px) {
  .app {
    padding: 0 20px;
  }
  .experiment {
    grid-template-columns: minmax(0, 1fr);
  }
  .model-panel {
    border-left: 0;
    border-top: 1px solid var(--line);
    padding: 16px 20px;
  }
  .model-panel h2,
  .panel-note,
  .belief-flow,
  .small-note,
  .model-panel > .eyebrow {
    display: none;
  }
  .metrics {
    display: grid;
    grid-template-columns: repeat(3, minmax(0, 1fr));
    gap: 12px;
    margin: 0;
  }
  .metrics > div {
    border: 0;
    display: block;
    padding: 0;
  }
  dd {
    font-size: 19px;
    margin-top: 5px;
  }
  dt {
    font-size: 10px;
    line-height: 1.6;
  }
  dt small {
    font-size: 9px;
  }
  canvas {
    height: clamp(260px, 42vh, 400px);
  }
  .keyboard-hint,
  .masthead > .eyebrow {
    display: none;
  }
  .intro {
    padding: 24px 0;
  }
  .intro .invitation {
    font-size: 11px;
  }
}
@media (max-width: 520px) {
  .app {
    padding: 0 16px;
  }
  .masthead {
    height: 60px;
    gap: 12px;
  }
  #status {
    font-size: 9px;
  }
  .intro {
    padding: 22px 0;
  }
  .intro .invitation {
    display: none;
  }
  .intro p {
    font-size: 12px;
    margin-top: 9px;
  }
  .scene-wrap {
    padding: 14px 12px;
  }
  .scene-labels {
    font-size: 9px;
  }
  .scene-labels small {
    display: none;
  }
  canvas {
    height: 290px;
  }
  .push-controls {
    grid-template-columns: 1fr 1fr;
    gap: 10px;
  }
  .force-control {
    grid-column: 1/-1;
    grid-row: 2;
    padding: 0 7px;
  }
  .force-control label {
    font-size: 9px;
  }
  input[type="range"] {
    min-height: 44px;
  }
  .toolbar {
    padding: 14px 0;
  }
  .buttons {
    display: grid;
    grid-template-columns: 1fr 1fr 1.35fr;
    width: 100%;
    gap: 7px;
  }
  .buttons button {
    font-size: 12px;
    padding: 9px;
  }
  footer {
    font-size: 8px;
    line-height: 1.7;
    padding: 17px 0;
    gap: 14px;
  }
  footer span:last-child {
    text-align: right;
  }
}
@media (max-height: 500px) and (min-width: 521px) {
  .masthead {
    height: 48px;
  }
  .intro {
    padding: 14px 0;
  }
  .intro h1 {
    font-size: 30px;
  }
  canvas {
    height: 240px;
  }
}
@media (prefers-reduced-motion: reduce) {
  button:active {
    transform: none;
  }
}