:root {
  --orange: #ff6a00;
  --orange-soft: #ffd2b0;
  --purple: #7c3aed;
  --purple-soft: #d6c7ff;
  --bg: #fafafa;
  --grid: #d6d6d6;
  --grid-strong: #b4b4b4;
  --legal: rgba(56, 142, 60, 0.45);
  --illegal: rgba(211, 47, 47, 0.45);
  --highlight: rgba(255, 235, 59, 0.55);
  --muted: #8a8a8a;
  --card: #ffffff;
  --border: #e0e0e0;
}

* { box-sizing: border-box; }

body {
  margin: 0;
  font-family: ui-sans-serif, -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, sans-serif;
  background: var(--bg);
  color: #222;
}

header {
  display: flex; align-items: center; justify-content: space-between;
  padding: 14px 22px;
  border-bottom: 1px solid var(--border);
  background: #fff;
}
header h1 { margin: 0; font-size: 18px; font-weight: 600; }
.muted { color: var(--muted); font-weight: 400; }
.controls { display: flex; gap: 10px; align-items: center; }
.controls select, .controls button {
  font: inherit; padding: 5px 10px; border: 1px solid var(--border);
  background: #fff; border-radius: 4px; cursor: pointer;
}
.controls button:hover:not(:disabled) { background: #f0f0f0; }
.controls button:disabled { opacity: 0.45; cursor: not-allowed; }

main {
  display: grid;
  grid-template-columns: minmax(580px, max-content) 1fr;
  gap: 24px;
  padding: 20px 22px 0;
}

.board-wrap { display: flex; flex-direction: column; gap: 8px; }
#board { display: block; background: #fff; border: 1px solid var(--border); border-radius: 4px; cursor: pointer; }
.hint { font-size: 13px; color: var(--muted); }

.side-panel { display: flex; flex-direction: column; gap: 14px; }
.scores { display: grid; grid-template-columns: 1fr 1fr; gap: 10px; }
.score-card { padding: 10px 12px; background: var(--card); border: 1px solid var(--border); border-radius: 6px; }
.score-card .label { font-size: 12px; text-transform: uppercase; letter-spacing: 0.4px; color: var(--muted); }
.score-card .value { font-size: 26px; font-weight: 700; line-height: 1; margin-top: 4px; }
.score-card .sub { font-size: 12px; color: var(--muted); margin-top: 4px; }
.score-card.p0 .value { color: var(--orange); }
.score-card.p1 .value { color: var(--purple); }

.status-row { display: flex; gap: 16px; font-size: 13px; color: #333; }
.engine-meta, .message-area { background: var(--card); border: 1px solid var(--border); border-radius: 6px; padding: 10px 12px; }
.section-title { font-size: 11px; text-transform: uppercase; letter-spacing: 0.4px; color: var(--muted); margin-bottom: 6px; }
.meta-body { font-family: ui-monospace, SFMono-Regular, Consolas, monospace; font-size: 12px; white-space: pre-wrap; line-height: 1.4; }
#message { font-size: 13px; }

.trays {
  display: grid; grid-template-columns: 1fr 1fr; gap: 24px; padding: 20px 22px 30px;
}
.tray-block h2 { margin: 0 0 8px; font-size: 13px; text-transform: uppercase; letter-spacing: 0.4px; color: var(--muted); }
.tray { display: flex; flex-wrap: wrap; gap: 8px; }
.tray .piece-card {
  display: flex; flex-direction: column; align-items: center; gap: 2px;
  border: 1px solid var(--border); border-radius: 4px; padding: 4px; background: #fff;
  cursor: pointer;
}
.tray .piece-card.used { opacity: 0.25; cursor: not-allowed; }
.tray .piece-card.selected { outline: 2px solid #333; outline-offset: -2px; }
.tray .piece-card:not(.used):hover { background: #f4f4f4; }
.tray .piece-card .piece-canvas { display: block; }
.tray .piece-card .piece-name { font-size: 10px; color: var(--muted); }