* {
  margin: 0;
  padding: 0;
  box-sizing: border-box;
}

:root {
  --bg-top: #111827;
  --bg-bottom: #0b1220;
  --accent-x: #38bdf8;
  --accent-o: #f472b6;
  --accent-win: #fbbf24;
  --text: #f1f5f9;
  --muted: #94a3b8;
  --card: rgba(255, 255, 255, 0.05);
  --border: rgba(255, 255, 255, 0.1);
  --cell: rgba(255, 255, 255, 0.05);
}

body {
  font-family: "Segoe UI", system-ui, -apple-system, sans-serif;
  min-height: 100vh;
  display: grid;
  place-items: center;
  background: radial-gradient(1200px 700px at 70% 20%, #1e293b, var(--bg-top)) ,
              linear-gradient(180deg, var(--bg-top), var(--bg-bottom));
  color: var(--text);
  padding: 1.5rem;
}

.game {
  width: 100%;
  max-width: 430px;
  text-align: center;
}

.title {
  font-size: clamp(1.8rem, 6vw, 2.6rem);
  font-weight: 800;
  letter-spacing: -0.02em;
  margin-bottom: 1.5rem;
}

.scoreboard {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 0.75rem;
  margin-bottom: 1.2rem;
}

.score {
  background: var(--card);
  border: 1px solid var(--border);
  border-radius: 0.9rem;
  padding: 0.85rem 0.5rem;
}

.score-label {
  display: block;
  font-size: 0.68rem;
  font-weight: 700;
  letter-spacing: 0.1em;
  text-transform: uppercase;
  color: var(--muted);
}

.score-value {
  display: block;
  margin-top: 0.25rem;
  font-size: 1.7rem;
  font-weight: 800;
  line-height: 1;
}

.player-x .score-value {
  color: var(--accent-x);
}

.player-o .score-value {
  color: var(--accent-o);
}

.status {
  font-size: 1.05rem;
  font-weight: 600;
  margin-bottom: 1.2rem;
  min-height: 1.6rem;
  transition: color 0.2s;
}

.status.won {
  color: var(--accent-win);
}

.board {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 0.6rem;
  margin-bottom: 1.5rem;
}

.cell {
  aspect-ratio: 1;
  font-family: inherit;
  font-size: clamp(2.2rem, 10vw, 3.2rem);
  font-weight: 800;
  color: var(--text);
  background: var(--cell);
  border: 1px solid var(--border);
  border-radius: 0.9rem;
  cursor: pointer;
  transition: background 0.15s, border-color 0.15s, transform 0.15s;
}

.cell:hover:not(.taken) {
  background: rgba(255, 255, 255, 0.1);
  transform: translateY(-2px);
}

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

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

.cell.win {
  background: rgba(251, 191, 36, 0.18);
  border-color: var(--accent-win);
  animation: pop 0.4s ease;
}

.board.draw .cell {
  border-color: rgba(255, 255, 255, 0.07);
}

@keyframes pop {
  0% {
    transform: scale(1);
  }
  50% {
    transform: scale(1.12);
  }
  100% {
    transform: scale(1);
  }
}

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

.btn {
  padding: 0.75rem 1.6rem;
  font-size: 0.95rem;
  font-weight: 700;
  font-family: inherit;
  color: #0b1220;
  background: var(--accent-win);
  border: none;
  border-radius: 0.75rem;
  cursor: pointer;
  transition: transform 0.15s, box-shadow 0.2s, opacity 0.2s;
  box-shadow: 0 8px 22px rgba(251, 191, 36, 0.35);
}

.btn:hover {
  transform: translateY(-2px);
  box-shadow: 0 12px 28px rgba(251, 191, 36, 0.45);
}

.btn-ghost {
  color: var(--text);
  background: transparent;
  border: 1px solid var(--border);
  box-shadow: none;
}

.btn-ghost:hover {
  background: rgba(255, 255, 255, 0.08);
  box-shadow: none;
}

@media (max-width: 380px) {
  .board {
    gap: 0.45rem;
  }
  .controls {
    flex-direction: column;
  }
  .btn {
    width: 100%;
  }
}