/* 디자인 토큰: docs/design.md */
:root {
  --bg: #0b0d18;
  --bg-glow: #161a30;
  --panel: #161931;
  --panel-border: #2a2f55;
  --grid: #1b1f38;
  --grid-line: rgba(255, 255, 255, 0.05);
  --text: #e8e9f3;
  --muted: #9aa0c2;
  --accent: #7c8bff;
  --ghost: rgba(255, 255, 255, 0.18);
  --flash: #ffffff;
  --gap: 16px;
  --cell: 30px;
}

* { box-sizing: border-box; }

body {
  margin: 0;
  min-height: 100vh;
  display: flex;
  align-items: center;
  justify-content: center;
  background: radial-gradient(circle at top, var(--bg-glow), var(--bg));
  color: var(--text);
  font-family: "Segoe UI", system-ui, -apple-system, sans-serif;
}

.game { padding: 24px; }

.game__title {
  margin: 0 0 16px;
  text-align: center;
  letter-spacing: 0.4em;
  font-size: 2rem;
  color: var(--accent);
  text-shadow: 0 0 18px rgba(124, 139, 255, 0.5);
}

.game__layout {
  display: flex;
  gap: var(--gap);
  align-items: flex-start;
  justify-content: center;
}

.side {
  display: flex;
  flex-direction: column;
  gap: var(--gap);
  width: 160px;
}

.board-area { position: relative; }

#board {
  display: block;
  background: var(--grid);
  border: 2px solid var(--panel-border);
  border-radius: 8px;
}

.overlay {
  position: absolute;
  inset: 0;
  display: flex;
  flex-direction: column;
  align-items: center;
  justify-content: center;
  gap: 8px;
  background: rgba(11, 13, 24, 0.82);
  border-radius: 8px;
  text-align: center;
}
.overlay.hidden { display: none; }
.overlay__title {
  margin: 0;
  font-size: 2rem;
  letter-spacing: 0.2em;
  color: var(--accent);
}
.overlay__desc { margin: 0; color: var(--muted); }

.panel {
  background: var(--panel);
  border: 1px solid var(--panel-border);
  border-radius: 8px;
  padding: 14px;
}
.panel__title {
  margin: 0 0 10px;
  font-size: 0.85rem;
  letter-spacing: 0.2em;
  color: var(--muted);
  text-transform: uppercase;
}

#hold, #next {
  display: block;
  margin: 0 auto;
  background: var(--grid);
  border-radius: 6px;
}

.stats { margin: 0; }
.stats__row {
  display: flex;
  justify-content: space-between;
  align-items: baseline;
  padding: 4px 0;
}
.stats__row dt { color: var(--muted); font-size: 0.9rem; }
.stats__row dd {
  margin: 0;
  font-size: 1.3rem;
  font-weight: 700;
  font-variant-numeric: tabular-nums;
}

.controls__list {
  margin: 0;
  padding: 0;
  list-style: none;
  display: flex;
  flex-direction: column;
  gap: 8px;
  font-size: 0.8rem;
  color: var(--muted);
}

kbd {
  display: inline-block;
  min-width: 1.4em;
  padding: 2px 5px;
  text-align: center;
  background: #2c2f52;
  border: 1px solid #3a3e66;
  border-bottom-width: 2px;
  border-radius: 4px;
  color: var(--text);
  font-family: inherit;
  font-size: 0.75rem;
}

@media (max-width: 720px) {
  .game__layout { flex-direction: column; align-items: center; }
  .side { width: 300px; flex-direction: row; flex-wrap: wrap; }
  .side .panel { flex: 1; }
}

@media (prefers-reduced-motion: reduce) {
  .game__title { text-shadow: none; }
}