:root {
  --bg: #f5f5f3;
  --surface: #ffffff;
  --line: #d6d6d1;
  --text: #1b1b19;
  --muted: #8b8b85;
  --you: #1b1b19;
  --you-edge: #1b1b19;
  --ai: #e4572e;
  --ai-edge: #c9441f;
  --focus: #e4572e;
  color-scheme: light;
}

@media (prefers-color-scheme: dark) {
  :root {
    --bg: #111110;
    --surface: #1a1a18;
    --line: #3a3a36;
    --text: #efefea;
    --muted: #85857f;
    --you: #efefea;
    --you-edge: #efefea;
    --ai: #ff7448;
    --ai-edge: #ff8a63;
    --focus: #ff7448;
    color-scheme: dark;
  }
}

* { box-sizing: border-box; }

html, body { margin: 0; }

body {
  min-height: 100vh;
  background: var(--bg);
  color: var(--text);
  font: 15px/1.4 ui-sans-serif, system-ui, -apple-system, "Segoe UI", Roboto, sans-serif;
  -webkit-font-smoothing: antialiased;
}

.app {
  width: min(100%, 560px);
  margin: 0 auto;
  padding: 32px 16px 40px;
  display: flex;
  flex-direction: column;
  gap: 20px;
}

header {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 16px;
}

h1 {
  margin: 0;
  font-size: 22px;
  font-weight: 650;
  letter-spacing: -0.01em;
}

.sub {
  margin: 2px 0 0;
  color: var(--muted);
  font-size: 13px;
}

button {
  flex: none;
  font: inherit;
  font-weight: 550;
  color: var(--text);
  background: var(--surface);
  border: 1px solid var(--line);
  border-radius: 999px;
  padding: 8px 16px;
  cursor: pointer;
  transition: border-color .15s;
}
button:hover { border-color: var(--muted); }
button:focus-visible { outline: 2px solid var(--focus); outline-offset: 2px; }

.players {
  display: grid;
  gap: 6px;
}

.player {
  display: flex;
  align-items: center;
  gap: 10px;
  padding: 10px 14px;
  border-radius: 12px;
  background: var(--surface);
  border: 1px solid transparent;
  opacity: .55;
  transition: opacity .2s, border-color .2s;
}
.player.active { opacity: 1; border-color: var(--line); }

.swatch {
  width: 12px;
  height: 12px;
  border-radius: 50%;
}
.swatch.you { background: var(--you); }
.swatch.ai { background: var(--ai); }

.name { font-weight: 550; flex: 1; }

.pips { display: flex; gap: 5px; }
.pip {
  width: 8px;
  height: 8px;
  border-radius: 50%;
  border: 1.5px solid currentColor;
}
.pip.hand { background: currentColor; }
.pip.lost { opacity: .2; }
#player0 .pips { color: var(--you); }
#player1 .pips { color: var(--ai); }

#board {
  width: 100%;
  height: auto;
  aspect-ratio: 1;
  background: var(--surface);
  border-radius: 20px;
  user-select: none;
  -webkit-tap-highlight-color: transparent;
}

#board .grid {
  stroke: var(--line);
  stroke-width: 4;
  stroke-linecap: round;
  fill: none;
}

.pt { outline: none; }
.pt .hit { fill: transparent; }
.pt.click { cursor: pointer; }

.pt .dot {
  fill: var(--line);
  transition: fill .15s, r .15s;
}
.pt.click .dot { fill: var(--muted); }
.pt.target .dot { fill: var(--text); r: 10; }
.pt.from .dot { fill: none; stroke: var(--muted); stroke-width: 3; r: 11; }

.pt .piece {
  opacity: 0;
  transform: scale(.6);
  transform-box: fill-box;
  transform-origin: center;
  stroke-width: 3;
  transition: opacity .18s, transform .18s;
}
.pt .piece.on { opacity: 1; transform: scale(1); }
.pt .piece.you { fill: var(--you); stroke: var(--you-edge); }
.pt .piece.ai { fill: var(--ai); stroke: var(--ai-edge); }
.pt .piece.ghost { animation: fade .9s ease-out forwards; }

.pt .ring {
  fill: none;
  stroke-width: 3;
  stroke: transparent;
  transition: stroke .15s;
}
.pt.sel .ring { stroke: var(--text); }
.pt.last .ring { stroke: var(--muted); stroke-dasharray: 4 6; }
.pt.take .ring { stroke: var(--ai); animation: pulse 1.1s ease-in-out infinite; }

.pt:focus-visible .ring { stroke: var(--focus); }

@keyframes fade {
  from { opacity: .85; transform: scale(1); }
  to { opacity: 0; transform: scale(.7); }
}

@keyframes pulse {
  50% { stroke-opacity: .35; }
}

#status {
  margin: 0;
  min-height: 1.4em;
  text-align: center;
  color: var(--muted);
}
#status strong { color: var(--text); font-weight: 600; }

@media (prefers-reduced-motion: reduce) {
  * { transition: none !important; animation: none !important; }
}