:root {
  color-scheme: light;
  --paper: #f7f4ed;
  --ink: #202328;
  --muted: #6b6e76;
  --line: #d8d2c6;
  --panel: #fffaf1;
  --blue: #2557c7;
  --red: #d33838;
  --green: #1f7a4d;
  --amber: #9a671d;
  --shadow: 0 18px 50px rgba(52, 43, 32, 0.13);
  font-family: Inter, ui-sans-serif, system-ui, -apple-system, BlinkMacSystemFont, "Segoe UI", sans-serif;
}

* {
  box-sizing: border-box;
}

body {
  margin: 0;
  min-height: 100vh;
  color: var(--ink);
  background: var(--paper);
}

button,
input {
  font: inherit;
}

button {
  min-height: 42px;
  border: 1px solid var(--line);
  border-radius: 8px;
  color: var(--ink);
  background: #fffdf8;
  cursor: pointer;
}

button:hover {
  border-color: #bdb4a4;
}

button:focus-visible,
input:focus-visible {
  outline: 3px solid rgba(37, 87, 199, 0.24);
  outline-offset: 2px;
}

.app-shell {
  display: grid;
  grid-template-columns: minmax(0, 1fr) 300px;
  gap: 20px;
  min-height: 100vh;
  padding: 18px;
}

.play-area {
  display: flex;
  flex-direction: column;
  min-width: 0;
  border: 1px solid var(--line);
  border-radius: 8px;
  background: var(--panel);
  box-shadow: var(--shadow);
  overflow: hidden;
}

.top-bar {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 18px;
  padding: 18px 20px 12px;
  border-bottom: 1px solid var(--line);
}

.eyebrow {
  margin: 0 0 3px;
  color: var(--muted);
  font-size: 0.78rem;
  font-weight: 700;
  letter-spacing: 0.08em;
  text-transform: uppercase;
}

h1 {
  margin: 0;
  font-size: clamp(1.6rem, 3vw, 2.65rem);
  line-height: 1;
}

.score-strip {
  display: flex;
  gap: 8px;
  align-items: center;
  color: var(--muted);
  white-space: nowrap;
}

.score-strip span {
  padding: 7px 10px;
  border: 1px solid var(--line);
  border-radius: 8px;
  background: #fffdf8;
}

.canvas-wrap {
  min-height: 0;
  padding: 12px 14px 6px;
}

canvas {
  display: block;
  width: 100%;
  aspect-ratio: 5 / 3;
  max-height: calc(100vh - 220px);
  border: 1px solid var(--line);
  border-radius: 8px;
  background: #fffdf8;
}

.question-row {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 16px;
  padding: 14px 20px 18px;
}

.question-row p {
  margin: 0;
  font-size: 1.05rem;
  font-weight: 650;
}

.answer-buttons {
  display: grid;
  grid-template-columns: repeat(2, minmax(112px, 1fr));
  gap: 10px;
}

.answer-button {
  font-weight: 750;
}

.answer-button.correct {
  border-color: rgba(31, 122, 77, 0.65);
  background: rgba(31, 122, 77, 0.13);
}

.answer-button.incorrect {
  border-color: rgba(211, 56, 56, 0.65);
  background: rgba(211, 56, 56, 0.12);
}

.reveal-panel {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 18px;
  padding: 16px 20px;
  border-top: 1px solid var(--line);
  background: #f2eadc;
}

.result-label {
  margin: 0 0 4px;
  color: var(--muted);
  font-size: 0.78rem;
  font-weight: 750;
  text-transform: uppercase;
}

.result-text {
  margin: 0;
  font-size: 1.25rem;
  font-weight: 800;
}

.primary-button {
  min-width: 132px;
  border-color: #242831;
  color: #fff;
  background: #242831;
  font-weight: 750;
}

.side-panel {
  display: flex;
  flex-direction: column;
  gap: 14px;
  min-width: 0;
}

.control-group,
.answer-key,
.history {
  border: 1px solid var(--line);
  border-radius: 8px;
  background: var(--panel);
  padding: 14px;
}

.control-group {
  display: grid;
  gap: 12px;
}

.control-group label {
  color: var(--muted);
  font-size: 0.9rem;
  font-weight: 750;
}

.switch-row {
  display: grid;
  grid-template-columns: 18px 1fr;
  gap: 10px;
  align-items: center;
  color: var(--ink) !important;
}

.switch-row input {
  width: 18px;
  height: 18px;
  margin: 0;
}

input[type="range"] {
  width: 100%;
  accent-color: var(--blue);
}

.compact-buttons {
  grid-template-columns: 1fr 1fr;
}

.legend {
  display: flex;
  gap: 14px;
  margin-bottom: 12px;
  color: var(--muted);
  font-size: 0.9rem;
  font-weight: 750;
}

.swatch {
  display: inline-block;
  width: 18px;
  height: 4px;
  margin-right: 6px;
  vertical-align: middle;
  border-radius: 2px;
}

.swatch.blue {
  background: var(--blue);
}

.swatch.red {
  background: var(--red);
}

.sign-rows {
  display: grid;
  gap: 8px;
}

.sign-row {
  display: grid;
  grid-template-columns: 34px 1fr;
  gap: 8px;
  align-items: center;
}

.sign-row-label {
  color: var(--muted);
  font-family: ui-monospace, SFMono-Regular, Menlo, Consolas, monospace;
  font-size: 0.8rem;
  text-align: right;
}

.mini-track {
  position: relative;
  height: 34px;
  border: 1px solid var(--line);
  border-radius: 6px;
  background: #fffdf8;
  overflow: hidden;
}

.mini-track canvas {
  width: 100%;
  height: 100%;
  max-height: none;
  border: 0;
  border-radius: 0;
  background: transparent;
}

.patterns {
  display: grid;
  gap: 7px;
  margin-top: 14px;
}

.patterns p {
  display: grid;
  grid-template-columns: 42px 1fr;
  gap: 8px;
  margin: 0;
  align-items: start;
  color: var(--muted);
  font-size: 0.84rem;
  font-weight: 750;
}

code {
  min-height: 24px;
  color: var(--ink);
  font-family: ui-monospace, SFMono-Regular, Menlo, Consolas, monospace;
  font-size: 0.9rem;
  white-space: normal;
  overflow-wrap: anywhere;
}

.history {
  min-height: 130px;
}

.history h2 {
  margin: 0 0 10px;
  font-size: 1rem;
}

.history ol {
  display: grid;
  gap: 8px;
  margin: 0;
  padding-left: 22px;
  color: var(--muted);
}

.history li.correct {
  color: var(--green);
}

.history li.incorrect {
  color: var(--amber);
}

[hidden] {
  display: none !important;
}

@media (max-width: 880px) {
  .app-shell {
    grid-template-columns: 1fr;
    padding: 10px;
  }

  .side-panel {
    display: grid;
    grid-template-columns: repeat(2, minmax(0, 1fr));
  }

  .answer-key,
  .history {
    grid-column: 1 / -1;
  }
}

@media (max-width: 620px) {
  .top-bar,
  .question-row,
  .reveal-panel {
    align-items: stretch;
    flex-direction: column;
  }

  .score-strip {
    justify-content: space-between;
  }

  .answer-buttons {
    grid-template-columns: 1fr 1fr;
  }

  .side-panel {
    grid-template-columns: 1fr;
  }

  canvas {
    aspect-ratio: 4 / 3;
    max-height: none;
  }
}
.app-shell {grid-template-columns:minmax(0,1fr) 310px;align-items:start}.top-bar h1{font-size:clamp(1.5rem,2.8vw,2.5rem)}.toolbar{display:flex;flex-wrap:wrap;gap:8px;padding:14px 20px}.toolbar button{padding:8px 13px}.plots{padding:0 20px}h2{font-size:1rem;margin:8px 0}h2 span{font-size:.8rem;color:var(--muted);font-weight:400;margin-left:8px}.plots canvas{aspect-ratio:auto;max-height:none;width:100%;height:190px}.plots #gate{height:140px}.plots #phase{height:270px;cursor:crosshair;touch-action:manipulation}.legend{font-size:.8rem;margin:8px 0;flex-wrap:wrap}.blue{color:#2557c7}.red{color:#d33838}.green{color:#1f7a4d}#status{padding:0 20px;font-size:.85rem;color:var(--muted)}select{width:100%;padding:8px;border:1px solid var(--line);border-radius:6px;background:#fffdf8;font:inherit}.slider-label{display:flex;justify-content:space-between;gap:8px;margin-top:14px}.control-group h2{margin:0}.control-group p,.control-group li{font-size:.85rem;line-height:1.5}.control-group ol{padding-left:19px;margin:0}.control-group li+li{margin-top:8px}.hint{color:var(--muted);margin:0}summary{cursor:pointer;font-weight:700}details p{overflow-wrap:anywhere}#clock{white-space:nowrap;color:var(--muted)}@media(max-width:880px){.app-shell{grid-template-columns:1fr}.side-panel{grid-template-columns:1fr 1fr}}@media(max-width:620px){.side-panel{grid-template-columns:1fr}.plots{padding:0 10px}.toolbar{padding:12px 10px}.plots #phase{height:250px}}

input[type="number"] { width:100%; min-height:38px; padding:7px 9px; border:1px solid var(--line); border-radius:6px; background:#fffdf8; color:var(--ink); }

.manifold-stable { color:#8051ad; }
.manifold-unstable { color:#c4730e; }

.plots #current { height:140px; }

.reading { grid-column:1 / -1; padding:22px; border:1px solid var(--line); border-radius:12px; background:#fffdf8; font-size:.9rem; line-height:1.6; }
.reading h2 { margin:0 0 12px; font-size:1.15rem; }
.reading p { margin:0 0 12px; }
.reading ul { margin:12px 0 0; padding-left:22px; }
.reading li+li { margin-top:8px; }
.reading a { color:#2557c7; text-underline-offset:3px; }
.reading a:hover { color:#173a88; }

/* Controls flank the plots; teaching material follows across the full width. */
.app-shell { grid-template-columns:270px minmax(0,1fr) 290px; }
.full-width { grid-column:1 / -1; }
.phase-controls { min-width:0; }
@media(max-width:1150px) {
  .app-shell { grid-template-columns:250px minmax(0,1fr); }
  .side-panel { grid-column:1 / -1; }
}
@media(max-width:700px) {
  .app-shell { grid-template-columns:minmax(0,1fr); }
  .phase-controls,.side-panel,.play-area { grid-column:1; }
}

#manifoldControls { display:grid; gap:12px; }
#manifoldControls[hidden] { display:none; }

.model-notes { display:block; }
.model-content { padding-top:16px; }
.model-content h3 { margin:22px 0 10px; font-size:1rem; }
.model-content p { font-size:.95rem; line-height:1.7; margin:12px 0; overflow-wrap:normal; }
.model-content math { font-size:1.12em; }
.equation { overflow-x:auto; padding:16px 12px; margin:12px 0; background:#f7f4ed; border-radius:6px; }
.equation math { font-size:1.2rem; min-width:max-content; }
.activation-equations { display:grid; grid-template-columns:repeat(2,minmax(0,1fr)); gap:16px; }
.parameter-table { overflow-x:auto; }
.parameter-table table { width:100%; border-collapse:collapse; font-size:.9rem; }
.parameter-table th,.parameter-table td { text-align:left; padding:9px 12px; border-bottom:1px solid var(--line); }
.parameter-table thead { background:#f7f4ed; }
.parameter-table .math-symbol { font-family:"STIX Two Math","Cambria Math",serif; font-size:1.05rem; font-weight:400; white-space:nowrap; }
@media(max-width:700px) { .activation-equations { grid-template-columns:1fr; gap:0; } }