:root {
  --bg: #0f172a;
  --panel: #1e293b;
  --text: #e2e8f0;
  --x: #38bdf8;
  --o: #f472b6;
  --win: #22c55e;
}

* {
  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", Roboto, sans-serif;
}

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

h1 {
  letter-spacing: 0.3em;
  margin-bottom: 0.5rem;
}

.status {
  font-size: 1.25rem;
  min-height: 1.5em;
}

.board {
  display: grid;
  grid-template-columns: repeat(3, min(25vw, 110px));
  grid-template-rows: repeat(3, min(25vw, 110px));
  gap: 8px;
  justify-content: center;
  margin: 1.5rem auto;
}

.cell {
  background: var(--panel);
  border: none;
  border-radius: 12px;
  font-size: min(14vw, 4rem);
  font-weight: 700;
  color: var(--text);
  cursor: pointer;
  transition: transform 0.1s, background 0.2s;
}

.cell:hover:not(:disabled) {
  transform: scale(1.04);
  background: #334155;
}

.cell:disabled {
  cursor: default;
}

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

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

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

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

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