:root {
  --bg: #f5f5f5;
  --panel: #ffffff;
  --panel2: #edf2f7;
  --text: #2d3748;
  --muted: #718096;
  --accent: #BC5215;
  --accent-soft: #f6dccd;
  --ok: #2f855a;
  --bad: #c53030;
  --mono: ui-monospace, "Cascadia Mono", Menlo, Consolas, monospace;
  --sans: "Atkinson Hyperlegible", system-ui, sans-serif;
}

* { box-sizing: border-box; }

body {
  margin: 0;
  display: grid;
  grid-template-columns: 260px 1fr 280px;
  height: 100vh;
  font-family: var(--sans);
  color: var(--text);
  background: var(--bg);
}

h1 { font-size: 20px; margin: 0 0 4px; }
h2 { font-size: 14px; text-transform: uppercase; letter-spacing: 0.06em; color: var(--muted); margin: 18px 0 6px; }
p { margin: 4px 0; }
.sub { color: var(--muted); font-size: 13px; }
.help { color: var(--muted); font-size: 12px; }
.hidden { display: none !important; }

aside {
  padding: 16px;
  background: var(--panel);
  overflow-y: auto;
  display: flex;
  flex-direction: column;
}
#sidebar { border-right: 1px solid #ddd; }
#spec { border-left: 1px solid #ddd; }
.sidebar-footer { margin-top: auto; padding-top: 16px; display: flex; flex-direction: column; gap: 6px; }

ul { list-style: none; margin: 0; padding: 0; }

#toolbox li, #levels li {
  display: flex;
  align-items: center;
  gap: 8px;
  padding: 7px 10px;
  margin: 3px 0;
  border: 1px solid #ddd;
  border-radius: 6px;
  background: var(--panel2);
  font-size: 13px;
  cursor: pointer;
  user-select: none;
}
#toolbox li .name, #levels li .name {
  font-family: var(--mono);
  font-weight: 600;
  min-width: 44px;
}
#toolbox .icon { width: 36px; height: 26px; flex-shrink: 0; }
.sym { fill: none; stroke: var(--text); stroke-width: 2.5; stroke-linejoin: round; stroke-linecap: round; }
.sym.body { fill: var(--panel); }
#levels .marker-slot { width: 20px; height: 26px; flex-shrink: 0; }
#levels .marker { width: 20px; height: 26px; display: block; animation: bob 0.8s steps(1) infinite; }
#levels li .name { min-width: 20px; }
#toolbox li { cursor: grab; user-select: none; touch-action: none; }
#toolbox li:hover { border-color: var(--accent); }
#toolbox li.locked, #levels li.locked { opacity: 0.45; cursor: not-allowed; }
#toolbox li.unlocking { animation: pop 0.8s ease-out; border-color: var(--accent); }
#levels li.current { border-color: var(--accent); background: var(--accent-soft); }
#levels li .status { margin-left: auto; color: var(--muted); font-size: 12px; }
#levels li span:nth-child(3) { white-space: nowrap; }
#levels li.done .status { color: var(--ok); }

@keyframes pop {
  0% { transform: scale(0.9); background: var(--accent); color: white; }
  60% { transform: scale(1.06); }
  100% { transform: scale(1); }
}

main {
  display: flex;
  flex-direction: column;
  padding: 12px 16px;
  min-width: 0;
}
header { display: flex; justify-content: space-between; align-items: flex-start; gap: 12px; }
header h2 { font-size: 20px; text-transform: none; letter-spacing: 0; color: var(--text); margin: 0; }
#level-desc { color: var(--muted); }
.actions { display: flex; gap: 6px; flex-shrink: 0; }
.hint { background: var(--accent-soft); padding: 8px 12px; border-radius: 6px; font-size: 14px; }

button {
  font: inherit;
  font-size: 13px;
  padding: 6px 12px;
  border-radius: 6px;
  border: 1px solid #ccc;
  background: var(--panel);
  color: var(--text);
  cursor: pointer;
}
button:hover { border-color: var(--accent); }
button.primary { background: var(--accent); border-color: var(--accent); color: white; }
button.danger { color: var(--bad); }

#board-wrap {
  flex: 1;
  margin-top: 10px;
  overflow: auto;
  border: 1px solid #ddd;
  border-radius: 6px;
  background: var(--bg);
}
#board { display: block; user-select: none; touch-action: none; }

/* board elements */
.board-bg { fill: #f1ead9; }
.hole { fill: #8c8f95; }
.rail { stroke-width: 2; opacity: 0.55; }
.rail.red { stroke: #c53030; }
.rail.blue { stroke: #2b6cb0; }
.gate-body { fill: var(--panel2); stroke: var(--text); stroke-width: 2; cursor: grab; }
.gate.sel .gate-body { stroke: var(--accent); stroke-width: 3; }
.gate-name { font-family: var(--mono); font-size: 13px; font-weight: 700; fill: var(--text); text-anchor: middle; dominant-baseline: middle; pointer-events: none; }
.gate .sym { stroke-width: 2.2; }
.port-label { font-family: var(--mono); font-size: 9px; fill: var(--muted); dominant-baseline: middle; pointer-events: none; }
.port { fill: var(--panel); stroke: var(--muted); stroke-width: 2; cursor: crosshair; }
.port:hover { stroke: var(--accent); r: 7; }
.port.on { fill: var(--accent); stroke: var(--accent); }
.port.bad { stroke: var(--bad); stroke-width: 3; }
.port.target { r: 10; stroke: var(--accent); stroke-width: 3; fill: var(--accent-soft); }
.wire { fill: none; stroke: var(--muted); stroke-width: 2.5; stroke-linecap: round; stroke-linejoin: round; pointer-events: none; }
.wire.on { stroke: var(--accent); stroke-width: 3; }
.wire.sel { stroke: #2b6cb0; stroke-width: 4; }
.wire-hit { fill: none; stroke: transparent; stroke-width: 12; cursor: pointer; }
.wire-temp { fill: none; stroke: var(--accent); stroke-width: 2; stroke-dasharray: 5 4; pointer-events: none; }
.pin-body { fill: var(--panel2); stroke: var(--muted); stroke-width: 1.5; rx: 4; }
.pin.in .pin-body { cursor: pointer; }
.pin.on .pin-body { fill: var(--accent-soft); stroke: var(--accent); }
.pin-label { font-family: var(--mono); font-size: 13px; font-weight: 600; dominant-baseline: middle; pointer-events: none; }
.switch-track { fill: #c3cad3; stroke: #9aa3ad; stroke-width: 1; }
.pin.on .switch-track { fill: var(--accent); stroke: var(--accent); }
.switch-knob { fill: #fff; stroke: #8a929c; stroke-width: 1.5; }
.led { fill: #d5d9de; stroke: #9aa3ad; stroke-width: 1.5; }
.pin.on .led { fill: var(--accent); stroke: #8a3a0c; }
.pin.none .led { fill: none; stroke-dasharray: 2 2; }
.pin-value { font-family: var(--mono); font-size: 13px; font-weight: 600; dominant-baseline: middle; text-anchor: middle; pointer-events: none; }
.pin-value.off { fill: var(--muted); }
.pin-value.on { fill: var(--accent); }
.group-label { font-family: var(--mono); font-size: 11px; fill: var(--muted); }

/* spec panel */
table.truth { border-collapse: collapse; font-family: var(--mono); font-size: 12px; margin-top: 6px; }
table.truth th, table.truth td { border: 1px solid #ddd; padding: 3px 8px; text-align: center; }
table.truth th { background: var(--panel2); }
table.truth th.out, table.truth td.out { border-left: 2px solid var(--muted); }
table.truth tr.live td { background: var(--accent-soft); }
.readout { font-family: var(--mono); font-size: 13px; margin-top: 8px; line-height: 1.6; }
.readout b { color: var(--accent); }
.result { font-size: 13px; padding: 10px; border-radius: 6px; background: var(--panel2); line-height: 1.5; }
.result.ok { background: #e6f4ea; color: var(--ok); }
.result.bad { background: #fde8e8; color: var(--bad); }
.result code { font-family: var(--mono); }

/* celebration */
#confetti { position: fixed; inset: 0; pointer-events: none; z-index: 20; }
#toast {
  position: fixed;
  top: 24px;
  left: 50%;
  transform: translateX(-50%);
  background: var(--accent);
  color: white;
  padding: 14px 28px;
  border-radius: 8px;
  font-size: 18px;
  font-weight: 600;
  z-index: 21;
  box-shadow: 0 6px 20px rgba(0,0,0,0.2);
  animation: toast-in 0.4s ease-out;
}
@keyframes toast-in {
  from { transform: translate(-50%, -30px); opacity: 0; }
  to { transform: translate(-50%, 0); opacity: 1; }
}

/* course clear screen */
#win {
  position: fixed;
  inset: 0;
  z-index: 25;
  background: rgba(0, 0, 0, 0.55);
  display: flex;
  align-items: center;
  justify-content: center;
  padding: 16px;
}
.win-panel {
  width: min(720px, 100%);
  max-height: 100%;
  overflow-y: auto;
  background: #000;
  color: #fff;
  border: 4px solid #fff;
  box-shadow: 8px 8px 0 #a04000;
  font-family: "Press Start 2P", ui-monospace, monospace;
  display: flex;
  flex-direction: column;
  align-items: center;
  padding: 20px 24px 24px;
  image-rendering: pixelated;
  animation: win-pop 0.4s steps(4) both;
}
#win .hud {
  width: min(720px, 100%);
  display: flex;
  justify-content: space-between;
  font-size: 12px;
  color: #ddd;
}
.win-title {
  font-size: 32px;
  margin: 24px 0 12px;
  color: #ffd700;
  text-shadow: 4px 4px 0 #a04000;
  text-transform: none;
  letter-spacing: 0;
  animation: win-pop 0.6s steps(4) both;
}
.win-sub { font-size: 11px; color: #ddd; margin: 0 0 20px; text-align: center; line-height: 1.8; }
#win .scene { width: min(640px, 100%); height: auto; }
.scene .pole { fill: #9fd36a; }
.scene .ball { fill: #ffd700; }
.scene .flag rect { fill: #e8e8e8; }
.scene .flag { animation: flag-down 1.6s steps(12) 0.3s both; }
.scene .bobcat { animation: run 2.5s steps(25) 1.6s both; }
.scene .legs-a { animation: legs-a 0.3s steps(1) infinite; }
.scene .legs-b { animation: legs-b 0.3s steps(1) infinite; }
.scene .block { fill: #c8a060; }
.scene .castle rect { fill: #9a7850; }
.scene .castle .door { fill: #000; }
.scene .castle .win-dark { fill: #000; }
.scene .ground { fill: #c8a060; }
#win-tally { width: min(360px, 100%); margin: 16px 0; font-size: 12px; }
.tally-row {
  display: flex;
  gap: 8px;
  padding: 4px 0;
  opacity: 0;
  animation: tally-in 0.2s steps(2) both;
}
.tally-row .dots { flex: 1; border-bottom: 2px dotted #666; margin-bottom: 4px; }
.win-form { display: flex; flex-direction: column; align-items: center; gap: 12px; margin-top: 8px; font-size: 12px; }
.win-form label { animation: blink 1.2s steps(1) infinite; }
.win-form .row { display: flex; gap: 10px; }
.win-form input {
  font: inherit;
  font-size: 12px;
  background: #000;
  color: #fff;
  border: 3px solid #fff;
  padding: 8px 10px;
  width: 200px;
}
.win-form input:focus { outline: none; border-color: #ffd700; }
#win button {
  font: inherit;
  font-size: 11px;
  background: #fff;
  color: #000;
  border: 3px solid #fff;
  border-radius: 0;
  padding: 8px 12px;
  cursor: pointer;
  box-shadow: 3px 3px 0 #a04000;
}
#win button:hover { background: #ffd700; border-color: #ffd700; }
#win button:active { transform: translate(2px, 2px); box-shadow: 1px 1px 0 #a04000; }
#code-out { display: flex; align-items: center; gap: 12px; }
#code {
  font: inherit;
  font-size: 14px;
  color: #ffd700;
  background: #222;
  border: 3px solid #ffd700;
  padding: 10px 14px;
  letter-spacing: 1px;
}
.win-note { font-size: 10px; color: #aaa; margin: 4px 0 0; }
#win-close { margin-top: 8px; }

@keyframes win-pop { from { transform: scale(0.4); opacity: 0; } to { transform: scale(1); opacity: 1; } }
@keyframes flag-down { from { transform: translateY(0); } to { transform: translateY(64px); } }
@keyframes tally-in { from { opacity: 0; transform: translateX(-10px); } to { opacity: 1; transform: translateX(0); } }
@keyframes blink { 50% { opacity: 0; } }
@keyframes run {
  0% { transform: translateX(0); opacity: 1; }
  96% { transform: translateX(160px); opacity: 1; }
  100% { transform: translateX(166px); opacity: 0; }
}
@keyframes legs-a { 0% { visibility: visible; } 50% { visibility: hidden; } }
@keyframes legs-b { 0% { visibility: hidden; } 50% { visibility: visible; } }
@keyframes bob { 0% { transform: translateY(0); } 50% { transform: translateY(-2px); } }