:root {
  --bg: #0f172a;
  --surface: #1e293b;
  --surface-hover: #263449;
  --border: #334155;
  --text: #e2e8f0;
  --muted: #94a3b8;
  --x: #38bdf8;
  --o: #fb7185;
  --win: #4ade80;
}

* {
  box-sizing: border-box;
}

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

.game {
  text-align: center;
  padding: 2rem;
}

h1 {
  margin: 0 0 0.25rem;
  font-size: 2.5rem;
}

.subtitle {
  margin: 0 0 1.5rem;
  color: var(--muted);
}

.scoreboard {
  display: flex;
  justify-content: center;
  gap: 1rem;
  margin-bottom: 1.5rem;
}

.score {
  background: var(--surface);
  border: 1px solid var(--border);
  border-radius: 0.5rem;
  padding: 0.5rem 1rem;
  min-width: 5.5rem;
  display: flex;
  flex-direction: column;
  gap: 0.25rem;
}

.score-label {
  color: var(--muted);
  font-size: 0.85rem;
}

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

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

.score-value {
  font-size: 1.5rem;
  font-weight: 700;
}

.status {
  font-size: 1.25rem;
  margin: 0 0 1rem;
  min-height: 1.5rem;
}

.board {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 0.5rem;
  width: min(80vw, 24rem);
  margin: 0 auto 1.5rem;
}

.cell {
  aspect-ratio: 1;
  font-size: 3rem;
  font-weight: 700;
  background: var(--surface);
  color: var(--text);
  border: 1px solid var(--border);
  border-radius: 0.5rem;
  cursor: pointer;
  transition: background 0.15s ease;
}

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

.cell:disabled {
  cursor: default;
}

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

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

.cell.winning {
  background: rgba(74, 222, 128, 0.15);
  border-color: var(--win);
}

.actions {
  display: flex;
  justify-content: center;
  gap: 0.75rem;
}

.actions button {
  background: var(--surface);
  color: var(--text);
  border: 1px solid var(--border);
  border-radius: 0.5rem;
  padding: 0.6rem 1.2rem;
  font-size: 1rem;
  cursor: pointer;
}

.actions button:hover {
  background: var(--surface-hover);
}