:root {
  --bg: #0f172a;
  --panel: #1e293b;
  --text: #e2e8f0;
  --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;
}

main {
  text-align: center;
  padding: 1rem;
}

h1 {
  margin: 0 0 0.5rem;
  letter-spacing: 0.1em;
  text-transform: uppercase;
}

.status {
  min-height: 1.5em;
  font-size: 1.2rem;
}

.board {
  display: grid;
  grid-template-columns: repeat(3, min(25vw, 110px));
  gap: 8px;
  margin: 1rem auto;
  width: max-content;
}

.cell {
  aspect-ratio: 1;
  border: none;
  border-radius: 12px;
  background: var(--panel);
  color: var(--text);
  font-size: clamp(2rem, 10vw, 3.5rem);
  font-weight: 700;
  cursor: pointer;
  transition: background 0.15s, transform 0.1s;
}

.cell:hover:not(:disabled) {
  background: #334155;
}

.cell:disabled {
  cursor: default;
}

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

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

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

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

.reset {
  padding: 0.6rem 1.4rem;
  border: none;
  border-radius: 8px;
  background: var(--x);
  color: var(--bg);
  font-size: 1rem;
  font-weight: 600;
  cursor: pointer;
}

.reset:hover {
  filter: brightness(1.1);
}