:root {
  --bg-0: #07111d;
  --bg-1: #0d192b;
  --bg-2: #12243c;
  --panel: rgba(10, 18, 31, 0.86);
  --panel-soft: rgba(14, 25, 41, 0.76);
  --line: rgba(193, 216, 248, 0.12);
  --line-strong: rgba(193, 216, 248, 0.22);
  --text: #edf3fb;
  --muted: #9bb0c8;
  --blue: #66aefc;
  --cyan: #64d7e5;
  --orange: #ff9c43;
  --green: #50d48a;
  --red: #ff7272;
  --purple: #918cff;
  --shadow: 0 24px 80px rgba(0, 0, 0, 0.34);
}

* {
  box-sizing: border-box;
}

html,
body {
  margin: 0;
  min-height: 100%;
  background:
    radial-gradient(circle at top left, rgba(102, 174, 252, 0.16), transparent 22%),
    radial-gradient(circle at top right, rgba(255, 156, 67, 0.12), transparent 20%),
    linear-gradient(180deg, var(--bg-0), var(--bg-1) 45%, var(--bg-2));
  color: var(--text);
  font-family: "IBM Plex Sans", system-ui, sans-serif;
}

body {
  min-height: 100vh;
}

body.capture-mode {
  overflow: hidden;
}

.app-shell {
  max-width: 1580px;
  margin: 0 auto;
  padding: 18px 18px 24px;
}

.toolbar {
  display: flex;
  align-items: flex-start;
  gap: 18px;
  margin-bottom: 14px;
}

.brand-block {
  max-width: 880px;
}

.eyebrow,
.figure-kicker,
.story-step,
.metric-label,
.math-label {
  margin: 0 0 8px;
  color: var(--cyan);
  font-size: 0.72rem;
  font-weight: 700;
  letter-spacing: 0.16em;
  text-transform: uppercase;
}

h1,
h2,
h3 {
  margin: 0;
  line-height: 1.02;
}

h1,
h2 {
  font-family: "Newsreader", Georgia, serif;
}

h1 {
  font-size: clamp(1.9rem, 2.4vw, 2.6rem);
  font-weight: 700;
  letter-spacing: -0.03em;
}

h2 {
  font-size: 1.9rem;
  letter-spacing: -0.03em;
}

h3 {
  font-size: 1.15rem;
  font-weight: 600;
}

.subhead,
.figure-note,
.narrative-text,
.story-card p,
.metric-label,
.toggle,
.status-label,
.canvas-caption,
.legend-chip {
  color: var(--muted);
}

.subhead {
  margin: 10px 0 0;
  max-width: 78ch;
  font-size: 0.95rem;
  line-height: 1.55;
}

.toolbar-controls {
  display: flex;
  gap: 14px;
  flex-wrap: wrap;
  justify-items: end;
  justify-content: flex-end;
  align-items: flex-start;
}

.control-group-block {
  display: grid;
  gap: 6px;
  justify-items: end;
}

.control-label {
  font-size: 0.7rem;
  letter-spacing: 0.12em;
  text-transform: uppercase;
  color: var(--muted);
}

.mode-strip,
.utility-strip,
.legend-row {
  display: flex;
  gap: 10px;
  flex-wrap: wrap;
}

.mode-button,
.ghost-button,
.toggle,
.legend-chip {
  border-radius: 999px;
  border: 1px solid var(--line);
  background: rgba(255, 255, 255, 0.05);
  backdrop-filter: blur(14px);
  -webkit-backdrop-filter: blur(14px);
  transition: 160ms ease;
}

.mode-button,
.ghost-button {
  appearance: none;
  cursor: pointer;
  color: var(--text);
  font: inherit;
  padding: 11px 16px;
}

.mode-button {
  font-weight: 600;
}

.mode-button:hover,
.ghost-button:hover,
.story-card:hover {
  transform: translateY(-1px);
  border-color: var(--line-strong);
  background: rgba(255, 255, 255, 0.08);
}

.mode-button.active {
  background: rgba(237, 243, 251, 0.12);
  border-color: rgba(237, 243, 251, 0.28);
  box-shadow: var(--shadow);
}

.toggle {
  display: inline-flex;
  align-items: center;
  gap: 8px;
  padding: 11px 14px;
  font-size: 0.92rem;
}

.toggle input {
  accent-color: var(--orange);
}

.app-layout {
  display: grid;
  grid-template-columns: minmax(0, 1.44fr) minmax(300px, 0.56fr);
  gap: 16px;
  align-items: start;
}

.stage-panel,
.story-card,
.math-card {
  background: var(--panel);
  border: 1px solid var(--line);
  border-radius: 26px;
  box-shadow: var(--shadow);
  backdrop-filter: blur(16px);
  -webkit-backdrop-filter: blur(16px);
}

.stage-panel {
  padding: 14px;
}

body.capture-mode .app-shell {
  max-width: none;
  padding: 0;
}

body.capture-mode .toolbar,
body.capture-mode .side-rail,
body.capture-mode .stage-header,
body.capture-mode .figure-meta,
body.capture-mode .canvas-caption,
body.capture-mode .stage-footer,
body.capture-mode .render-state {
  display: none !important;
}

body.capture-mode .app-layout {
  display: block;
}

body.capture-mode .stage-panel {
  background: transparent;
  border: none;
  border-radius: 0;
  box-shadow: none;
  padding: 20px;
}

body.capture-mode .canvas-grid {
  grid-template-columns: repeat(2, minmax(0, 1fr));
  gap: 20px;
}

body.capture-mode .figure-card {
  background: rgba(10, 18, 31, 0.38);
  border-radius: 28px;
  min-height: calc(100vh - 40px);
}

body.capture-mode .canvas-frame {
  min-height: calc(100vh - 40px);
  height: calc(100vh - 40px);
}

body.capture-mode.capture-mission .canvas-grid,
body.capture-mode.capture-geometry .canvas-grid {
  grid-template-columns: minmax(0, 1fr);
}

body.capture-mode.capture-mission .canvas-grid .figure-card:nth-child(2),
body.capture-mode.capture-geometry .canvas-grid .figure-card:nth-child(1) {
  display: none;
}

.stage-header,
.figure-meta,
.oracle-header {
  display: flex;
  justify-content: space-between;
  gap: 18px;
  align-items: flex-start;
}

.stage-header {
  margin-bottom: 10px;
}

.status-cluster {
  display: grid;
  justify-items: end;
  gap: 6px;
}

.status-label {
  font-size: 0.72rem;
  letter-spacing: 0.12em;
  text-transform: uppercase;
}

.status-pill,
.status-chip {
  display: inline-flex;
  align-items: center;
  border-radius: 999px;
  padding: 8px 12px;
  font-size: 0.76rem;
  font-weight: 700;
  letter-spacing: 0.08em;
  text-transform: uppercase;
}

.status-pill.free,
.status-chip.free {
  background: rgba(102, 174, 252, 0.18);
  color: #a8d0ff;
}

.status-pill.damped,
.status-chip.damped {
  background: rgba(255, 156, 67, 0.16);
  color: #ffd0a1;
}

.status-pill.lock,
.status-chip.lock {
  background: rgba(80, 212, 138, 0.16);
  color: #b7f1cd;
}

.canvas-grid {
  display: grid;
  grid-template-columns: repeat(2, minmax(0, 1fr));
  gap: 12px;
}

.figure-card {
  min-width: 0;
}

.figure-kicker {
  margin-bottom: 6px;
}

.figure-note {
  margin: 0;
  max-width: 22ch;
  font-size: 0.92rem;
  line-height: 1.4;
  text-align: right;
}

.canvas-frame {
  position: relative;
  margin-top: 10px;
  height: clamp(260px, 42vh, 420px);
  min-height: 260px;
  overflow: hidden;
  border-radius: 22px;
  border: 1px solid rgba(255, 255, 255, 0.08);
  background:
    radial-gradient(circle at top center, rgba(255, 255, 255, 0.05), transparent 42%),
    linear-gradient(180deg, rgba(255, 255, 255, 0.02), rgba(255, 255, 255, 0)),
    #07111d;
}

canvas {
  display: block;
  width: 100%;
  height: 100%;
}

.render-state {
  position: absolute;
  inset: 0;
  display: grid;
  place-items: center;
  background: rgba(7, 17, 29, 0.72);
  color: rgba(237, 243, 251, 0.82);
  font-size: 0.96rem;
  letter-spacing: 0.01em;
  transition: opacity 220ms ease;
}

.render-state.ready {
  opacity: 0;
  pointer-events: none;
}

.render-state.error {
  color: #ffd0d0;
  background: rgba(46, 10, 12, 0.82);
}

.canvas-caption {
  position: absolute;
  left: 14px;
  bottom: 14px;
  max-width: 320px;
  padding: 10px 12px;
  border-radius: 14px;
  background: rgba(8, 16, 28, 0.76);
  border: 1px solid rgba(255, 255, 255, 0.08);
  font-size: 0.84rem;
  line-height: 1.42;
}

.stage-footer {
  margin-top: 10px;
  display: grid;
  gap: 10px;
}

.oracle-strip {
  padding: 12px;
  border-radius: 20px;
  background: var(--panel-soft);
  border: 1px solid var(--line);
}

.readoff-strip {
  display: flex;
  gap: 10px;
  flex-wrap: wrap;
  margin-top: 10px;
}

.readoff-chip {
  display: inline-flex;
  align-items: center;
  gap: 8px;
  padding: 7px 11px;
  border-radius: 999px;
  background: rgba(255, 255, 255, 0.05);
  border: 1px solid rgba(255, 255, 255, 0.08);
}

.readoff-symbol,
.metric-symbol {
  color: var(--text);
}

.readoff-text,
.metric-label-text {
  color: var(--muted);
}

.metric-row {
  display: grid;
  grid-template-columns: repeat(4, minmax(0, 1fr));
  gap: 10px;
  margin-top: 10px;
}

.metric-card,
.math-card {
  padding: 12px 14px;
}

.metric-card {
  border-radius: 18px;
  background: rgba(255, 255, 255, 0.04);
  border: 1px solid rgba(255, 255, 255, 0.07);
}

.metric-label,
.math-label {
  display: block;
  margin-bottom: 6px;
}

.metric-label {
  display: flex;
  align-items: center;
  gap: 7px;
  min-height: 24px;
}

.metric-value {
  display: block;
  color: var(--text);
  font-family: "IBM Plex Mono", monospace;
  font-size: 1.12rem;
}

.metric-help,
.math-caption {
  display: block;
  margin-top: 8px;
  color: var(--muted);
  font-size: 0.8rem;
  line-height: 1.4;
}

.meter-block {
  margin-top: 12px;
}

.meter-meta {
  display: flex;
  justify-content: space-between;
  margin-bottom: 8px;
  color: var(--muted);
  font-size: 0.9rem;
}

.meter-track {
  overflow: hidden;
  height: 12px;
  border-radius: 999px;
  background: rgba(255, 255, 255, 0.08);
}

.meter-fill {
  width: 100%;
  height: 100%;
  border-radius: inherit;
  transform-origin: left center;
  background: linear-gradient(90deg, var(--red), var(--orange), var(--cyan), var(--blue));
}

.narrative-text {
  margin: 12px 0 0;
  font-size: 0.96rem;
  line-height: 1.55;
}

.legend-chip {
  display: inline-flex;
  align-items: center;
  gap: 8px;
  padding: 8px 12px;
  font-size: 0.88rem;
}

.swatch {
  width: 12px;
  height: 12px;
  border-radius: 999px;
}

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

.swatch.energy {
  background: var(--orange);
}

.swatch.target {
  background: #ff6c1e;
}

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

.swatch.control {
  background: var(--green);
}

.swatch.trail {
  background: linear-gradient(135deg, var(--purple), var(--blue));
}

.side-rail {
  display: grid;
  gap: 12px;
}

.mode-notes {
  display: grid;
  gap: 10px;
}

.story-card {
  padding: 14px 16px;
  cursor: pointer;
  transition: 160ms ease;
}

.story-card.active {
  border-color: rgba(255, 255, 255, 0.22);
  background: rgba(255, 255, 255, 0.08);
}

.story-card p {
  margin: 8px 0 0;
  font-size: 0.94rem;
  line-height: 1.45;
}

.math-panel {
  display: grid;
  gap: 10px;
}

.math-card {
  border-radius: 20px;
}

.math-block {
  min-height: 36px;
  color: var(--text);
}

.math-block .katex-display {
  margin: 0;
  overflow-x: auto;
  overflow-y: hidden;
}

.math-block .katex {
  font-size: 1.02em;
}

.math-inline {
  font-family: "IBM Plex Mono", monospace;
  color: #d9e6ff;
}

/* --- Deformation tab --- */

/* The HTML `hidden` attribute should ALWAYS hide a tab pane, even though
   `.app-layout` sets `display: grid` (specificity beats the UA default). */
[data-tab-pane][hidden] {
  display: none !important;
}

.tab-strip .tab-button {
  font-weight: 600;
}

.deformation-layout {
  grid-template-columns: minmax(0, 1.44fr) minmax(300px, 0.56fr);
}

.badge-row {
  display: flex;
  gap: 8px;
  flex-wrap: wrap;
  justify-content: flex-end;
}

.metric-badge {
  display: grid;
  gap: 4px;
  padding: 8px 12px;
  border-radius: 14px;
  background: rgba(255, 255, 255, 0.04);
  border: 1px solid rgba(255, 255, 255, 0.08);
  min-width: 110px;
}

.metric-badge .eyebrow {
  margin: 0;
  font-size: 0.62rem;
}

.metric-badge .metric-value {
  font-size: 0.92rem;
  letter-spacing: 0.02em;
}

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

.def-canvas-frame {
  height: clamp(420px, 62vh, 640px);
  min-height: 420px;
  background: #07111d;
}

#deformation-canvas {
  display: block;
  width: 100%;
  height: 100%;
}

.def-side-card {
  display: grid;
  gap: 12px;
  align-content: start;
}

.def-metric-row {
  display: grid;
  grid-template-columns: repeat(2, minmax(0, 1fr));
  gap: 10px;
}

.def-controls {
  padding: 14px;
}

.def-controls-row {
  display: grid;
  grid-template-columns: minmax(220px, 1fr) minmax(120px, auto) minmax(220px, 2fr) minmax(180px, auto);
  gap: 14px;
  align-items: end;
}

.def-control-block {
  display: grid;
  gap: 6px;
  min-width: 0;
}

.def-select {
  width: 100%;
  appearance: none;
  cursor: pointer;
  padding: 10px 12px;
  border-radius: 12px;
  border: 1px solid var(--line);
  background: rgba(255, 255, 255, 0.05);
  color: var(--text);
  font: inherit;
  font-size: 0.92rem;
  backdrop-filter: blur(14px);
  -webkit-backdrop-filter: blur(14px);
}

.def-select option {
  background: var(--bg-1);
  color: var(--text);
}

.def-method-label {
  display: inline-flex;
  align-items: center;
  padding: 10px 12px;
  border-radius: 12px;
  border: 1px solid var(--line);
  background: rgba(255, 255, 255, 0.04);
  color: var(--muted);
  font-family: "IBM Plex Mono", monospace;
  font-size: 0.88rem;
}

.def-slider {
  appearance: none;
  -webkit-appearance: none;
  width: 100%;
  height: 6px;
  border-radius: 999px;
  background: rgba(255, 255, 255, 0.1);
  outline: none;
}

.def-slider::-webkit-slider-thumb {
  -webkit-appearance: none;
  appearance: none;
  width: 16px;
  height: 16px;
  border-radius: 50%;
  background: var(--orange);
  cursor: pointer;
  border: 2px solid #fff;
  box-shadow: 0 2px 6px rgba(0, 0, 0, 0.4);
}

.def-slider::-moz-range-thumb {
  width: 16px;
  height: 16px;
  border-radius: 50%;
  background: var(--orange);
  cursor: pointer;
  border: 2px solid #fff;
  box-shadow: 0 2px 6px rgba(0, 0, 0, 0.4);
}

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

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

.def-run-info {
  color: var(--muted);
  font-size: 0.9rem;
  line-height: 1.45;
  font-family: "IBM Plex Mono", monospace;
}

@media (max-width: 1100px) {
  .def-controls-row {
    grid-template-columns: 1fr;
  }
}

@media (max-width: 1280px) {
  .app-layout {
    grid-template-columns: 1fr;
  }

  .canvas-frame {
    height: clamp(280px, 48vh, 460px);
    min-height: 280px;
  }

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

  .deformation-layout {
    grid-template-columns: 1fr;
  }

  .def-canvas-grid {
    grid-template-columns: 1fr;
  }
}

@media (max-width: 900px) {
  .toolbar {
    grid-template-columns: 1fr;
  }

  .toolbar-controls {
    justify-content: flex-start;
  }

  .control-group-block {
    justify-items: start;
  }

  .canvas-grid,
  .metric-row {
    grid-template-columns: 1fr;
  }

  .figure-note {
    text-align: left;
    max-width: none;
  }

  .canvas-frame {
    height: 360px;
    min-height: 360px;
  }
}

/* --- Knot strip + continuity coloring (M4-front) ----------------------- */

.def-knot-card {
  margin-top: 18px;
}

.def-knot-frame {
  position: relative;
  margin-top: 12px;
  background: #07111d;
  border-radius: 14px;
  border: 1px solid rgba(193, 216, 248, 0.08);
  overflow: hidden;
  padding: 14px 16px 8px;
  display: grid;
  grid-template-columns: 56px 1fr;
  grid-template-rows: 1fr auto;
  column-gap: 10px;
  row-gap: 4px;
}

.def-knot-yaxis {
  grid-column: 1;
  grid-row: 1;
  display: flex;
  flex-direction: column;
  justify-content: space-between;
  align-items: flex-end;
  font-family: "IBM Plex Mono", ui-monospace, monospace;
  font-size: 11px;
  color: rgba(193, 216, 248, 0.55);
  padding: 2px 0;
}

#def-knot-strip {
  grid-column: 2;
  grid-row: 1;
  display: block;
  width: 100%;
  height: 180px;
}

.def-knot-xaxis {
  grid-column: 2;
  grid-row: 2;
  display: flex;
  justify-content: space-between;
  align-items: baseline;
  margin-top: 4px;
  font-family: "IBM Plex Mono", ui-monospace, monospace;
  font-size: 11px;
  color: rgba(193, 216, 248, 0.55);
}

.def-knot-xaxis-mid {
  text-transform: uppercase;
  letter-spacing: 0.18em;
  color: rgba(193, 216, 248, 0.4);
}

.def-knot-legend {
  display: flex;
  gap: 12px;
  flex-wrap: wrap;
  margin-top: 14px;
}

.swatch.def-cont-c2 {
  background: linear-gradient(135deg, #5dd6a7, #2bb27a);
  box-shadow: 0 0 0 1px rgba(93, 214, 167, 0.25);
}

.swatch.def-cont-c1 {
  background: linear-gradient(135deg, #f5c061, #e89a2c);
  box-shadow: 0 0 0 1px rgba(245, 192, 97, 0.25);
}

.swatch.def-cont-c0 {
  background: linear-gradient(135deg, #ff6a6a, #d83b3b);
  box-shadow: 0 0 0 1px rgba(255, 106, 106, 0.3);
}

.swatch.def-knot-collapsed {
  background: linear-gradient(135deg, #c084fc, #7c3aed);
  box-shadow: 0 0 0 1px rgba(192, 132, 252, 0.3);
}

@media (max-width: 768px) {
  #def-knot-strip {
    height: 140px;
  }
}

/* --- Heatmap colour-scale legend (γ′ (c)) ----------------------------- */

.def-knot-scale {
  display: grid;
  grid-template-columns: 1fr auto;
  align-items: center;
  gap: 12px 16px;
  margin-top: 14px;
  padding: 10px 14px;
  background: rgba(255, 255, 255, 0.03);
  border: 1px solid rgba(193, 216, 248, 0.08);
  border-radius: 14px;
}

.def-knot-scale-meta {
  grid-column: 1;
  display: flex;
  align-items: baseline;
  gap: 10px;
  flex-wrap: wrap;
  font-family: "IBM Plex Mono", ui-monospace, monospace;
  font-size: 11px;
  color: rgba(193, 216, 248, 0.6);
}

.def-knot-scale-title {
  text-transform: uppercase;
  letter-spacing: 0.16em;
  color: var(--cyan);
  font-weight: 700;
}

.def-knot-scale-mode {
  text-transform: lowercase;
  letter-spacing: 0.04em;
}

.def-knot-scale-bar {
  grid-column: 1;
  display: grid;
  grid-template-columns: auto 1fr auto;
  align-items: center;
  gap: 10px;
  font-family: "IBM Plex Mono", ui-monospace, monospace;
  font-size: 11px;
  color: rgba(193, 216, 248, 0.7);
}

.def-knot-scale-gradient {
  display: block;
  height: 12px;
  border-radius: 6px;
  background: linear-gradient(to right, #7c3aed 0%, #b4deff 100%);
  border: 1px solid rgba(255, 255, 255, 0.08);
}

.def-knot-scale-end {
  white-space: nowrap;
}

.def-knot-scale-toggle {
  grid-column: 2;
  grid-row: 1 / span 2;
  align-self: center;
  padding: 6px 12px;
  font-size: 12px;
  white-space: nowrap;
}

@media (max-width: 720px) {
  .def-knot-scale {
    grid-template-columns: 1fr;
  }
  .def-knot-scale-toggle {
    grid-column: 1;
    grid-row: auto;
    justify-self: start;
  }
}