:root {
  --bg: #0b0d12;
  --panel: #12151d;
  --card: #171b25;
  --line: #252b38;
  --fg: #e7e9ef;
  --dim: #8b93a7;
  --accent: #e6a93c;
  --noun: #e0a256;
  --prop: #56c2c8;
  --is: #9aa3b5;
  --win: #6fe08a;
}

* { box-sizing: border-box; }

html, body {
  margin: 0;
  background: var(--bg);
  color: var(--fg);
  font: 15px/1.5 ui-sans-serif, system-ui, -apple-system, Segoe UI, Roboto, sans-serif;
  min-height: 100vh;
}

header#top {
  padding: 18px 22px 6px;
  max-width: 1180px;
  margin: 0 auto;
}
header h1 {
  margin: 0;
  font-size: 26px;
  letter-spacing: -0.01em;
}
header h1 .sub {
  color: var(--dim);
  font-weight: 500;
  font-size: 16px;
  margin-left: 8px;
}
header .tag {
  margin: 6px 0 0;
  color: var(--dim);
  max-width: 760px;
}
header .tag b {
  color: var(--noun);
  font-weight: 700;
  letter-spacing: 0.04em;
}
header .tag em { color: var(--fg); font-style: italic; }

main {
  display: flex;
  flex-direction: row-reverse; /* controls detached on the LEFT, canvas dominant on the right */
  gap: 18px;
  align-items: flex-start;
  padding: 12px 22px 40px;
  max-width: 1180px;
  margin: 0 auto;
}

#stage {
  flex: 1 1 auto;
  min-width: 0;
  display: flex;
  flex-direction: column;
  gap: 8px;
}
#baba-canvas {
  width: 100%;
  aspect-ratio: 4 / 3;
  background: #05060a;
  border: 1px solid var(--line);
  border-radius: 12px;
  display: block;
  touch-action: none;
}
#hint {
  color: var(--dim);
  font-size: 13px;
  text-align: center;
}

#panel {
  flex: 0 0 340px;
  display: flex;
  flex-direction: column;
  gap: 12px;
  transition: transform 0.18s ease;
}
#panel.bump { transform: translateY(-2px); }

.card {
  background: var(--card);
  border: 1px solid var(--line);
  border-radius: 12px;
  padding: 14px;
}
.card h3 {
  margin: 0 0 10px;
  font-size: 13px;
  text-transform: uppercase;
  letter-spacing: 0.08em;
  color: var(--dim);
}

.hud .row {
  display: flex;
  justify-content: space-between;
  padding: 3px 0;
}
.hud .k { color: var(--dim); }
.hud .v { font-weight: 600; }
.hud .status {
  margin-top: 8px;
  padding-top: 8px;
  border-top: 1px solid var(--line);
  color: var(--accent);
  font-size: 13px;
}

.rail {
  display: flex;
  flex-wrap: wrap;
  gap: 6px;
}
.rule-chip {
  display: inline-flex;
  gap: 5px;
  align-items: center;
  padding: 4px 9px;
  background: #0e1118;
  border: 1px solid var(--line);
  border-radius: 999px;
  font-size: 12px;
  font-weight: 700;
  letter-spacing: 0.03em;
  animation: pop 0.22s ease;
}
.rule-chip.won {
  border-color: var(--win);
  box-shadow: 0 0 0 1px rgba(111, 224, 138, 0.4);
}
.rule-chip.empty { color: var(--dim); font-weight: 500; }
.rule-chip .w-noun { color: var(--noun); }
.rule-chip .w-prop { color: var(--prop); }
.rule-chip .w-is { color: var(--is); }
.rules-text {
  margin-top: 8px;
  color: var(--dim);
  font-size: 12px;
  min-height: 1em;
}

.dpad {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  grid-template-rows: repeat(3, 34px);
  gap: 5px;
  width: 150px;
  margin: 0 auto 10px;
}
.dpad .up { grid-area: 1 / 2; }
.dpad .left { grid-area: 2 / 1; }
.dpad .right { grid-area: 2 / 3; }
.dpad .down { grid-area: 3 / 2; }

.btn-row {
  display: flex;
  gap: 6px;
  flex-wrap: wrap;
}
.btn-row button { flex: 1 1 auto; }

.seg {
  display: flex;
  flex-wrap: wrap;
  gap: 5px;
  margin-bottom: 8px;
}
.seg button.hard { border-color: rgba(224, 116, 106, 0.45); }
.seg button.verb { border-color: rgba(86, 194, 200, 0.5); }
.seg button.multi { border-color: rgba(190, 120, 230, 0.65); }
.seg-note { color: var(--dim); font-size: 11.5px; margin: 0 0 8px; }
.seg-note b { color: #e0746a; }

button {
  background: #1d2230;
  color: var(--fg);
  border: 1px solid var(--line);
  border-radius: 8px;
  padding: 7px 10px;
  font: inherit;
  font-size: 13px;
  cursor: pointer;
  transition: background 0.15s ease, transform 0.07s ease, border-color 0.15s ease,
    box-shadow 0.15s ease;
}
button:hover { background: #252c3d; }
button:active { transform: translateY(1px) scale(0.98); }
button.active {
  background: #243154;
  border-color: var(--accent);
  box-shadow: inset 0 0 0 1px rgba(91, 140, 255, 0.5);
}
.dpad .d { font-size: 15px; padding: 0; }

.legend summary {
  cursor: pointer;
  color: var(--dim);
  font-size: 13px;
}
.legend-grid {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 5px;
  margin: 10px 0;
  font-size: 12px;
  color: var(--dim);
}
.legend-grid span { display: flex; align-items: center; gap: 6px; }
.sw {
  width: 13px;
  height: 13px;
  border-radius: 3px;
  display: inline-block;
}
.sw.baba { background: #f24c8c; }
.sw.flag { background: #f7cc42; }
.sw.rock { background: #b38052; }
.sw.wall { background: #666e85; }
.sw.skull { background: #9485a8; }
.sw.water { background: #438eed; }
.sw.lava { background: #ed6b2c; }
.sw.word { background: #db765230; border: 1px solid var(--noun); }
.keys { color: var(--dim); font-size: 12px; }

/* --- decomposition panel (the headline) --- */
.decomp .blurb { color: var(--dim); font-size: 12.5px; margin: 0 0 10px; }
.decomp .blurb b { color: var(--prop); }
.decomp .blurb em { color: var(--fg); font-style: italic; }
.precision { display: flex; align-items: center; gap: 8px; margin-bottom: 10px; }
.precision label { color: var(--dim); font-size: 12px; }
.precision input[type='range'] { flex: 1; accent-color: var(--accent); }
.precision .pv {
  font-weight: 700;
  color: var(--accent);
  width: 56px;
  text-align: right;
  text-transform: uppercase;
  font-size: 12px;
  letter-spacing: 0.04em;
}
.proposal { display: flex; flex-wrap: wrap; gap: 5px; margin-bottom: 12px; min-height: 22px; align-items: center; }
.prop-head { color: var(--dim); font-size: 11.5px; margin-right: 2px; }
.macro-chip {
  font-size: 11px;
  font-weight: 700;
  padding: 3px 7px;
  border-radius: 6px;
  border: 1px solid var(--line);
  background: #0e1118;
  animation: pop 0.2s ease;
}
.macro-chip.route { color: var(--win); border-color: rgba(111, 224, 138, 0.4); }
.macro-chip.form { color: var(--prop); border-color: rgba(86, 194, 200, 0.4); }
.macro-chip.break { color: #e0746a; border-color: rgba(224, 116, 106, 0.4); }
.arms { display: grid; grid-template-columns: 1fr 1fr; gap: 10px; }
.arm {
  background: #0e1118;
  border: 1px solid var(--line);
  border-radius: 10px;
  padding: 12px;
  text-align: center;
  transition: border-color 0.2s ease, box-shadow 0.2s ease;
}
.arm .arm-head { font-weight: 700; letter-spacing: 0.05em; font-size: 13px; }
.arm .arm-head span { display: block; color: var(--dim); font-weight: 500; font-size: 11px; letter-spacing: 0; }
.arm .big {
  font-size: 34px;
  font-weight: 800;
  font-variant-numeric: tabular-nums;
  margin: 6px 0 0;
  transition: color 0.2s ease;
}
.arm .sub { color: var(--dim); font-size: 11px; min-height: 1.3em; margin-bottom: 8px; }
.arm button { width: 100%; }
.arm.searching { border-color: var(--accent); box-shadow: 0 0 0 1px rgba(91, 140, 255, 0.3); }
.arm.searching .big { color: var(--accent); }
.arm.solved { border-color: var(--win); box-shadow: 0 0 0 1px rgba(111, 224, 138, 0.35); }
.arm.solved .big { color: var(--win); }
.arm.censored { border-color: #e0746a; }
.arm.censored .big { color: #e0746a; }
.decomp .ref { margin-top: 10px; color: var(--dim); font-size: 11.5px; }
.decomp .ref b { color: var(--fg); }

/* --- transport: watch the solver play its solution (revealed on baba:solved) --- */
.transport { display: none; margin-top: 12px; padding-top: 12px; border-top: 1px solid var(--line); }
.transport.on { display: block; animation: pop 0.25s ease; }
.tr-head { display: flex; justify-content: space-between; align-items: baseline; margin-bottom: 8px; }
.tr-label { color: var(--win); font-weight: 700; font-size: 12.5px; letter-spacing: 0.03em; }
.tr-prog { color: var(--dim); font-size: 11.5px; font-variant-numeric: tabular-nums; }
.tr-btns { display: flex; align-items: center; gap: 6px; }
.tr-btns button { padding: 6px 9px; }
.tr-play { background: #223052; border-color: var(--win); color: var(--win); font-weight: 700; }
.tr-play:hover { background: #2a3a60; }
.tr-speed { display: flex; align-items: center; gap: 6px; color: var(--dim); font-size: 11px; margin-left: auto; }
.tr-speed input[type='range'] { accent-color: var(--win); width: 72px; }
.compact .transport { margin-top: 8px; padding-top: 8px; }

#baba-gen { width: 100%; margin-bottom: 8px; }
.hist-chip { font-size: 12px; padding: 4px 10px; border-radius: 999px; }

@keyframes pop {
  0% { transform: scale(0.85); opacity: 0.4; }
  100% { transform: scale(1); opacity: 1; }
}

@media (max-width: 820px) {
  main { flex-direction: column; }
  #panel { flex-basis: auto; width: 100%; }
  #baba-canvas { aspect-ratio: 1 / 1; }
}

/* --- compact embed mode (html.compact, via ?compact): a tight canvas + decomposition + d-pad,
   for embedding the explorer in a page without the full-app chrome. DOM is unchanged (boot.js wiring
   intact); the non-essential cards are just hidden. --- */
.compact header#top { display: none; }
.compact .embed-hide { display: none !important; }
.compact main { padding: 10px 12px; gap: 12px; max-width: none; }
.compact #panel { flex-basis: 286px; gap: 10px; }
.compact .card { padding: 11px; }
.compact .card h3 { margin-bottom: 7px; }
.compact .decomp .blurb { margin-bottom: 8px; }
.compact .decomp .ref { margin-top: 8px; }
.compact .arm { padding: 10px; }
.compact .arm .big { font-size: 27px; }
.compact #hint { font-size: 11.5px; }
@media (max-width: 720px) {
  .compact main { flex-direction: column; }
  .compact #panel { width: 100%; flex-basis: auto; }
  .compact #baba-canvas { aspect-ratio: 5 / 4; }
}