:root {
  --bg: #0f172a;
  --panel: #1e293b;
  --cell: #334155;
  --cell-hover: #475569;
  --text: #f1f5f9;
  --muted: #94a3b8;
  --x: #38bdf8;
  --o: #f472b6;
  --win: #22c55e;
}

* {
  box-sizing: border-box;
}

body {
  margin: 0;
  min-height: 100vh;
  display: grid;
  place-items: center;
  background: var(--bg);
  color: var(--text);
  font-family: system-ui, -apple-system, "Segoe UI", Roboto, sans-serif;
}

.game {
  width: min(92vw, 400px);
  text-align: center;
}

h1 {
  margin: 0 0 1rem;
  letter-spacing: 0.15em;
  text-transform: uppercase;
}

/* Scoreboard */
.scoreboard {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 0.5rem;
  margin-bottom: 1rem;
}

.score {
  display: flex;
  flex-direction: column;
  padding: 0.5rem;
  border-radius: 0.5rem;
  background: var(--panel);
  font-size: 1.5rem;
  font-weight: 700;
}

.score .label {
  font-size: 0.75rem;
  color: var(--muted);
  text-transform: uppercase;
}

.score-x { color: var(--x); }
.score-o { color: var(--o); }

.status {
  min-height: 1.5em;
  font-size: 1.15rem;
}

/* Board */
.board {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 0.5rem;
  aspect-ratio: 1;
}

.cell {
  border: none;
  border-radius: 0.5rem;
  background: var(--cell);
  color: var(--text);
  font-size: clamp(2.5rem, 14vw, 4rem);
  font-weight: 800;
  cursor: pointer;
  transition: background 0.15s, transform 0.1s;
}

.cell:hover:not(:disabled) {
  background: var(--cell-hover);
}

.cell:active:not(:disabled) {
  transform: scale(0.96);
}

.cell:disabled {
  cursor: default;
}

.cell:focus-visible,
button:focus-visible {
  outline: 3px solid var(--text);
  outline-offset: 2px;
}

.cell.x { color: var(--x); }
.cell.o { color: var(--o); }

.cell.win {
  background: var(--win);
  color: var(--bg);
}

/* Controls */
.controls {
  display: flex;
  gap: 0.5rem;
  justify-content: center;
  margin-top: 1.25rem;
}

.controls button {
  padding: 0.6rem 1.2rem;
  border: none;
  border-radius: 0.5rem;
  background: var(--x);
  color: var(--bg);
  font-size: 1rem;
  font-weight: 600;
  cursor: pointer;
}

.controls button.secondary {
  background: var(--panel);
  color: var(--text);
}