/* Shared interactive kit — projector-first contrast on dark UI */
:root {
  --bg: #0a0e1a;
  --panel: #121a2b;
  --panel-2: #0e1524;
  --grid: #3a4d72;
  --axis: #8fa3c7;
  --unit-circle: #5a6f96;
  --text: #ffffff;
  --text-muted: #c5d0e6;
  --text-dim: #a7b6d4;
  --accent: #5eead4;
  --accent-dim: #2a5a56;
  --z1: #5eead4;
  --z1-dim: #2a5a56;
  --z2: #fbbf24;
  --z2-dim: #6b551f;
  --prod: #fb7185;
  --prod-dim: #6e2f42;
  --conj: #c4b5fd;
  --conj-dim: #4c3d7a;
  --line: #4a5d82;
  --radius: 14px;
  --font-ui: "Inter", system-ui, sans-serif;
  --font-display: "Fraunces", Georgia, serif;
  --font-mono: "JetBrains Mono", ui-monospace, monospace;
  /* Interactive atoms — change these for sitewide look (not per-applet hex) */
  --hot: var(--accent);
  --hot-glow: rgba(94, 234, 212, 0.35);
  --chip-ink: var(--bg);
  --chip-0: #5eead4;
  --chip-1: #fbbf24;
  --chip-2: #fb7185;
  --chip-3: #c4b5fd;
  --chip-4: #7dd3fc;
  --chip-5: #86efac;
}

* { box-sizing: border-box; }

/* KaTeX metrics assume content-box; global border-box clips radicals / stretchy SVGs. */
.katex,
.katex * {
  box-sizing: content-box;
}
html, body { margin: 0; padding: 0; }

body.kit-body {
  background: radial-gradient(1200px 800px at 15% -10%, #101a30 0%, var(--bg) 55%);
  color: var(--text);
  font-family: var(--font-ui);
  min-height: 100vh;
  padding: 28px 20px 60px;
}

body.kit-body.embed {
  padding: 16px 14px 24px;
  min-height: 0;
  background: var(--bg);
}

/* Diagram-only showcase (home carousel). Hide chrome; keep the plane. */
body.kit-body.embed.scene {
  padding: 0;
  overflow: hidden;
  min-height: 100%;
  height: 100%;
  background: var(--bg);
}
body.kit-body.embed.scene .kit-wrap {
  max-width: none;
  margin: 0;
  height: 100%;
}
body.kit-body.embed.scene .kit-wrap > header {
  display: none !important;
}
body.kit-body.embed.scene .kit-layout {
  margin: 0;
  gap: 0;
  grid-template-columns: 1fr;
  height: 100%;
  align-items: stretch;
}
body.kit-body.embed.scene .kit-layout > :not(.plane) {
  display: none !important;
}
body.kit-body.embed.scene .kit-card.plane {
  border: none;
  border-radius: 0;
  box-shadow: none;
  background: transparent;
  padding: 10px 12px;
  height: 100%;
  display: flex;
  flex-direction: column;
  justify-content: center;
}
body.kit-body.embed.scene .kit-card.plane .kit-slider-row,
body.kit-body.embed.scene .kit-card.plane .kit-mode-row,
body.kit-body.embed.scene .kit-card.plane .kit-presets,
body.kit-body.embed.scene .kit-card.plane .kit-btn,
body.kit-body.embed.scene .kit-card.plane .kit-label,
body.kit-body.embed.scene .kit-card.plane .kit-toolbar,
body.kit-body.embed.scene .kit-card.plane > p,
body.kit-body.embed.scene .argand-polar-toggle {
  display: none !important;
}
body.kit-body.embed.scene svg.kit-plane,
body.kit-body.embed.scene svg.argand-viewport {
  max-height: min(520px, 100%);
}

/* Grow with the viewport (projector / fullscreen). Cap only on ultra-wide. */
.kit-wrap { max-width: min(1600px, 100%); margin: 0 auto; }

.kit-eyebrow {
  font-family: var(--font-mono);
  font-size: 12px;
  letter-spacing: 0.14em;
  text-transform: uppercase;
  color: var(--accent);
  margin: 0 0 6px;
}

.kit-wrap > header h1,
.kit-title {
  font-family: var(--font-display);
  font-weight: 600;
  font-size: clamp(24px, 3.4vw, 36px);
  margin: 0 0 8px;
  letter-spacing: -0.01em;
}

.kit-subhead {
  color: var(--text-muted);
  font-size: 16px;
  max-width: 52rem;
  line-height: 1.5;
  margin: 0;
}

/* Main column grows; sidebar stays readable. Do not hard-cap columns — fullscreen must use width. */
.kit-layout {
  display: grid;
  grid-template-columns: minmax(0, 1fr) minmax(260px, 380px);
  gap: 22px;
  align-items: start;
  margin-top: 26px;
}

/* Let grid children shrink; KaTeX nowrap must not blow the sidebar past its track. */
.kit-layout > * {
  min-width: 0;
}

@media (max-width: 880px) {
  .kit-layout { grid-template-columns: 1fr; }
}

.kit-card {
  background: var(--panel);
  border: 1px solid var(--line);
  border-radius: var(--radius);
  padding: 18px;
  max-width: 100%;
  min-width: 0;
}

.kit-card.plane { padding: 14px; }

/*
 * Plane SVGs must opt in via .kit-plane or .argand-viewport.
 * Never style ".kit-card svg" — that destroys KaTeX radical SVGs.
 * Do not override .katex svg display/position; KaTeX needs its own absolute layout.
 */
svg.kit-plane,
svg.argand-viewport {
  display: block;
  width: 100%;
  height: auto;
  touch-action: none;
}

/*
 * Contain wide KaTeX in the working column (scroll inside the box — do not bleed
 * past the card). Keep overflow-y visible so radical ink is not clipped vertically.
 */
.kit-eq-block {
  max-width: 100%;
  overflow-x: auto;
  overflow-y: visible;
}
.kit-eq-line {
  line-height: 1.55;
  padding: 2px 0;
  max-width: 100%;
  overflow-x: auto;
  overflow-y: visible;
}
/* HTML / short prose in the working block — wrap instead of one long KaTeX \text{…} */
.kit-eq-line.prose {
  overflow-x: visible;
  overflow-wrap: break-word;
  word-wrap: break-word;
  color: var(--text);
  font-size: 14px;
}
.kit-eq-line.prose .math {
  font-family: var(--font-mono);
  font-style: normal;
  color: var(--accent);
}

.katex {
  font-size: 1.05em;
  color: var(--text);
}
/*
 * KaTeX ships `.katex svg { width: 100% }`, but radicals use width="400em" +
 * viewBox slice clipped by `.hide-tail`. Forcing 100% makes the overline vanish
 * (only the radical hook remains). Restore the intrinsic 400em width.
 */
.katex .hide-tail > svg,
.katex .stretchy > svg,
.katex .sqrt svg {
  width: 400em !important;
  max-width: none !important;
  height: inherit;
}

.kit-toolbar {
  display: flex;
  align-items: center;
  justify-content: space-between;
  padding: 4px 6px 0;
  gap: 10px;
  flex-wrap: wrap;
}

.kit-legend {
  display: flex;
  gap: 14px;
  font-family: var(--font-mono);
  font-size: 12px;
  color: var(--text-muted);
}

.kit-legend span {
  display: inline-flex;
  align-items: center;
  gap: 5px;
}

.kit-dot {
  width: 9px;
  height: 9px;
  border-radius: 50%;
  display: inline-block;
}

.kit-presets { display: flex; gap: 6px; flex-wrap: wrap; }

.kit-btn {
  font-family: var(--font-ui);
  font-size: 12.5px;
  font-weight: 500;
  color: var(--text-muted);
  background: var(--panel-2);
  border: 1px solid var(--line);
  border-radius: 8px;
  padding: 7px 11px;
  cursor: pointer;
  transition: border-color 0.15s, color 0.15s, background 0.15s;
}

.kit-btn:hover { color: var(--text); border-color: #3a4a6b; }
.kit-btn:active { transform: translateY(1px); }
.kit-btn:focus-visible { outline: 2px solid var(--hot); outline-offset: 2px; }

.kit-btn.primary {
  color: var(--bg);
  background: linear-gradient(135deg, var(--accent), #6fe3d8);
  border: none;
  font-weight: 600;
}

.kit-btn.primary:hover { filter: brightness(1.08); color: var(--bg); }

.kit-mode-row {
  display: flex;
  gap: 8px;
  flex-wrap: wrap;
}

.kit-mode-row .kit-btn.active {
  color: var(--bg);
  background: var(--accent);
  border-color: var(--accent);
  font-weight: 600;
}

/*
 * Interactive atoms — use these for tokens / clickable marks / empty targets.
 * Applet-local CSS may size the scene; do not re-colour chrome or invent .chip.
 * Hover copy: set title="…" (native tooltip). Global hover look = --hot below.
 */
.kit-hot {
  cursor: pointer;
  user-select: none;
  transition: transform 0.12s, box-shadow 0.12s, filter 0.12s, opacity 0.12s;
}
.kit-hot:hover:not(.is-disabled):not(.used):not(:disabled) {
  transform: translateY(-2px);
  box-shadow: 0 0 0 2px var(--hot-glow);
}
.kit-hot:focus-visible {
  outline: 2px solid var(--hot);
  outline-offset: 2px;
}
.kit-hot.is-disabled,
.kit-hot.used,
.kit-hot:disabled {
  opacity: 0.28;
  cursor: default;
  transform: none;
  box-shadow: none;
  pointer-events: none;
}

.kit-chip {
  width: 42px;
  height: 42px;
  border-radius: 10px;
  display: inline-flex;
  align-items: center;
  justify-content: center;
  font-family: var(--font-mono);
  font-weight: 700;
  font-size: 1.05rem;
  color: var(--chip-ink);
  background: var(--chip-fill, var(--chip-0));
  border: 2px solid transparent;
  flex: 0 0 auto;
}
.kit-chip.c0 { --chip-fill: var(--chip-0); }
.kit-chip.c1 { --chip-fill: var(--chip-1); }
.kit-chip.c2 { --chip-fill: var(--chip-2); }
.kit-chip.c3 { --chip-fill: var(--chip-3); }
.kit-chip.c4 { --chip-fill: var(--chip-4); }
.kit-chip.c5 { --chip-fill: var(--chip-5); }
.kit-chip.sm { width: 36px; height: 36px; border-radius: 9px; font-size: 0.95rem; }
.kit-chip.xs { width: 22px; height: 22px; border-radius: 6px; font-size: 11px; }
/* Auto-width tokens for money / short phrases (not single letters) */
.kit-chip.wide {
  width: auto;
  min-width: 4.2rem;
  height: auto;
  min-height: 36px;
  padding: 6px 12px;
  font-size: 0.82rem;
  white-space: nowrap;
}
.kit-chip.wide.xs {
  min-width: 3.2rem;
  min-height: 24px;
  padding: 3px 8px;
  font-size: 11px;
}

.kit-slot {
  width: 48px;
  height: 48px;
  border-radius: 10px;
  border: 2px dashed var(--line);
  background: var(--panel);
  display: inline-flex;
  align-items: center;
  justify-content: center;
  font-family: var(--font-mono);
  color: var(--text-dim);
  font-size: 12px;
  flex: 0 0 auto;
}
.kit-slot.filled {
  border-style: solid;
  border-color: var(--accent);
}
.kit-slot.lg { width: 56px; height: 56px; border-radius: 12px; }

.kit-section { margin-bottom: 18px; }
.kit-section:last-child { margin-bottom: 0; }

.kit-label {
  font-family: var(--font-mono);
  font-size: 12px;
  letter-spacing: 0.1em;
  text-transform: uppercase;
  color: var(--text-dim);
  margin: 0 0 10px;
}

.kit-num-row {
  display: flex;
  align-items: center;
  gap: 10px;
  font-family: var(--font-mono);
  font-size: 15px;
  padding: 8px 10px;
  background: var(--panel-2);
  border-radius: 9px;
  border: 1px solid var(--line);
  margin-bottom: 8px;
}

.kit-num-row .swatch {
  width: 10px;
  height: 10px;
  border-radius: 3px;
  flex-shrink: 0;
}

.kit-num-row .eq { flex: 1; }
.kit-num-row .polar { color: var(--text-muted); font-size: 13px; }

.kit-polar-bar {
  margin: 0 0 8px;
  width: auto;
  max-width: 100%;
  justify-content: flex-start;
  padding: 0;
}
.kit-polar-toggle {
  width: auto;
  margin: 0;
  padding: 4px 0;
  border-bottom: none;
  gap: 12px;
}
.kit-toggle-row {
  display: flex;
  align-items: center;
  justify-content: space-between;
  padding: 10px 2px;
  border-bottom: 1px solid var(--line);
}

.kit-toggle-row:last-child { border-bottom: none; }
.kit-toggle-label { font-size: 14px; color: var(--text); }
.kit-toggle-sub { font-size: 13px; color: var(--text-muted); margin-top: 1px; }

.kit-switch {
  position: relative;
  width: 40px;
  height: 22px;
  background: #1c2740;
  border-radius: 999px;
  cursor: pointer;
  border: 1px solid var(--line);
  flex-shrink: 0;
  transition: background 0.18s;
}

.kit-switch.on { background: var(--accent-dim); border-color: var(--accent); }

.kit-switch::after {
  content: "";
  position: absolute;
  top: 2px;
  left: 2px;
  width: 16px;
  height: 16px;
  border-radius: 50%;
  background: #55637f;
  transition: transform 0.18s, background 0.18s;
}

.kit-switch.on::after {
  transform: translateX(18px);
  background: var(--accent);
}

.kit-eq-block {
  background: var(--panel-2);
  border: 1px solid var(--line);
  border-radius: 9px;
  padding: 14px 14px 10px;
  min-height: 40px;
  box-sizing: border-box;
}

.kit-eq-line { margin-bottom: 10px; font-size: 15px; }
.kit-eq-line:last-child { margin-bottom: 0; }
.kit-eq-line.muted { color: var(--text-muted); font-size: 14px; }

.kit-insight {
  font-size: 14px;
  line-height: 1.55;
  color: var(--text-muted);
  background: var(--panel-2);
  border-left: 2px solid var(--accent);
  border-radius: 0 8px 8px 0;
  padding: 10px 12px;
  margin-top: 12px;
  max-width: 100%;
  min-width: 0;
  overflow-wrap: break-word;
  word-wrap: break-word;
}

.kit-insight b { color: var(--text); font-weight: 600; }

.kit-hint {
  font-size: 13px;
  color: var(--text-muted);
  text-align: center;
  margin-top: 8px;
}

.kit-view-controls {
  display: flex;
  gap: 6px;
  flex-wrap: wrap;
  align-items: center;
}

svg.argand-viewport {
  cursor: grab;
}
svg.argand-viewport.is-panning {
  cursor: grabbing;
}
svg.argand-viewport.is-dragging-point {
  cursor: grabbing;
}

/* Sliders — shared across manipulative/demo interactives */
.kit-slider-row {
  display: flex;
  align-items: center;
  gap: 12px;
  margin-bottom: 12px;
}

.kit-slider-row:last-child { margin-bottom: 0; }

.kit-slider-label {
  font-family: var(--font-mono);
  font-size: 12px;
  letter-spacing: 0.04em;
  color: var(--text-dim);
  min-width: 54px;
  flex-shrink: 0;
}

.kit-slider-row input[type="range"] {
  flex: 1;
  accent-color: var(--accent);
  height: 4px;
  background: transparent;
  cursor: pointer;
}

.kit-slider-value {
  font-family: var(--font-mono);
  font-size: 14px;
  font-weight: 600;
  color: var(--text);
  min-width: 58px;
  text-align: right;
  flex-shrink: 0;
}

/* Multiple-choice / matching organisers */
.kit-organiser-item {
  background: var(--panel-2);
  border: 1px solid var(--line);
  border-radius: 10px;
  padding: 12px 14px;
  margin-bottom: 12px;
}

.kit-organiser-item:last-child { margin-bottom: 0; }

.kit-organiser-prompt { font-size: 14.5px; color: var(--text); margin-bottom: 10px; line-height: 1.45; }

.kit-choice-row { display: flex; gap: 8px; flex-wrap: wrap; }

.kit-choice-btn {
  font-family: var(--font-ui);
  font-size: 13px;
  color: var(--text-muted);
  background: var(--panel);
  border: 1px solid var(--line);
  border-radius: 8px;
  padding: 8px 12px;
  cursor: pointer;
  transition: border-color 0.15s, color 0.15s, background 0.15s;
}

.kit-choice-btn:hover { color: var(--text); border-color: #3a4a6b; }

.kit-choice-btn.correct {
  color: var(--bg);
  background: var(--accent);
  border-color: var(--accent);
  font-weight: 600;
}

.kit-choice-btn.incorrect {
  color: var(--text);
  background: var(--prod-dim);
  border-color: var(--prod);
}

.kit-choice-btn.disabled { pointer-events: none; opacity: 0.7; }

/* Stepped explainer navigation */
.kit-step-nav {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 10px;
  margin-top: 16px;
}

.kit-step-dots { display: flex; gap: 6px; }

.kit-step-dot {
  width: 8px;
  height: 8px;
  border-radius: 50%;
  background: var(--line);
  transition: background 0.15s, transform 0.15s;
}

.kit-step-dot.active { background: var(--accent); transform: scale(1.25); }
.kit-step-dot.done { background: var(--text-dim); }

.kit-status-pill {
  display: inline-block;
  font-family: var(--font-mono);
  font-size: 11px;
  letter-spacing: 0.06em;
  text-transform: uppercase;
  padding: 3px 9px;
  border-radius: 999px;
  border: 1px solid var(--line);
  color: var(--text-dim);
}

.kit-status-pill.ok { color: var(--bg); background: var(--accent); border-color: var(--accent); }
.kit-status-pill.bad { color: var(--text); background: var(--prod-dim); border-color: var(--prod); }

/* ledger.js — amortisation / period tables (finance family) */
.kit-ledger-wrap {
  max-height: 220px;
  overflow: auto;
  border-top: 1px solid var(--line);
  padding: 10px 14px 14px;
}
.kit-ledger {
  width: 100%;
  border-collapse: collapse;
  font-family: var(--font-mono);
  font-size: 12px;
}
.kit-ledger th {
  text-align: right;
  color: var(--text-dim);
  font-weight: 500;
  padding: 4px 8px;
  border-bottom: 1px solid var(--line);
  position: sticky;
  top: 0;
  background: var(--panel);
}
.kit-ledger th:first-child,
.kit-ledger td:first-child { text-align: left; }
.kit-ledger td {
  text-align: right;
  padding: 5px 8px;
  color: var(--text-muted);
  border-bottom: 1px solid rgba(58, 74, 107, 0.35);
}
.kit-ledger tr.fresh td {
  color: var(--text);
  background: rgba(94, 234, 212, 0.08);
}
.kit-ledger tr.muted td { opacity: 0.72; }

/* story.js — FLIP fly helpers (opacity ghost keeps measurable layout box) */
.kit-fly-ghost {
  opacity: 0 !important;
  pointer-events: none !important;
}
.kit-flyer {
  position: fixed;
  z-index: 9999;
  pointer-events: none;
  margin: 0;
  box-sizing: border-box;
  filter: drop-shadow(0 6px 10px rgba(0, 0, 0, 0.45));
}
.kit-flyer-hop {
  animation: kit-flyer-arc var(--kit-fly-dur, 1.35s) ease;
}
@keyframes kit-flyer-arc {
  0% { transform: translateY(0) scale(1); }
  40% { transform: translateY(-22px) scale(1.08); }
  100% { transform: translateY(0) scale(1); }
}
@media (prefers-reduced-motion: reduce) {
  .kit-flyer-hop { animation: none !important; }
  .kit-flyer {
    transition: none !important;
    filter: none;
  }
}