*,
*::before,
*::after {
  box-sizing: border-box;
}

:root {
  --bg: #0f1419;
  --surface: #1a2332;
  --border: #2d3a4f;
  --text: #e8edf4;
  --muted: #8b9cb3;
  --x: #5eead4;
  --o: #f472b6;
  --win: #fbbf24;
  --radius: 12px;
}

body {
  margin: 0;
  min-height: 100dvh;
  font-family: "Segoe UI", system-ui, sans-serif;
  background: radial-gradient(ellipse at top, #1e293b 0%, var(--bg) 55%);
  color: var(--text);
  display: flex;
  align-items: center;
  justify-content: center;
  padding: 1.5rem;
}

.app {
  width: min(100%, 380px);
  text-align: center;
}

header h1 {
  margin: 0;
  font-size: 2.5rem;
  letter-spacing: 0.15em;
  font-weight: 800;
}

.subtitle {
  margin: 0.25rem 0 1.5rem;
  color: var(--muted);
  font-size: 0.95rem;
}

.scoreboard {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 0.5rem;
  margin-bottom: 1.25rem;
}

.score {
  background: var(--surface);
  border: 1px solid var(--border);
  border-radius: var(--radius);
  padding: 0.65rem 0.5rem;
}

.score .label {
  display: block;
  font-size: 0.75rem;
  color: var(--muted);
  text-transform: uppercase;
  letter-spacing: 0.05em;
}

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

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

.status {
  margin: 0 0 1rem;
  font-size: 1.1rem;
  font-weight: 600;
  min-height: 1.5em;
}

.status.winner-x { color: var(--x); }
.status.winner-o { color: var(--o); }
.status.draw { color: var(--muted); }

.board {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 0.5rem;
  margin-bottom: 1.25rem;
}

.cell {
  aspect-ratio: 1;
  border: 2px solid var(--border);
  border-radius: var(--radius);
  background: var(--surface);
  color: var(--text);
  font-size: clamp(2.5rem, 12vw, 3.5rem);
  font-weight: 800;
  cursor: pointer;
  transition: background 0.15s, border-color 0.15s, transform 0.1s;
}

.cell:hover:not(:disabled) {
  background: #243044;
  border-color: #3d4f6a;
}

.cell:active:not(:disabled) {
  transform: scale(0.97);
}

.cell:disabled {
  cursor: default;
}

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

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

.cell.win {
  border-color: var(--win);
  background: rgba(251, 191, 36, 0.12);
  box-shadow: 0 0 20px rgba(251, 191, 36, 0.25);
}

.actions {
  display: flex;
  gap: 0.5rem;
  flex-wrap: wrap;
  justify-content: center;
}

.btn {
  border: none;
  border-radius: var(--radius);
  padding: 0.65rem 1.25rem;
  font-size: 0.95rem;
  font-weight: 600;
  cursor: pointer;
  transition: opacity 0.15s, transform 0.1s;
}

.btn:hover {
  opacity: 0.9;
}

.btn:active {
  transform: scale(0.98);
}

.btn.primary {
  background: linear-gradient(135deg, var(--x), #2dd4bf);
  color: #042f2e;
}

.btn.secondary {
  background: var(--surface);
  color: var(--muted);
  border: 1px solid var(--border);
}

.contact {
  margin-top: 2rem;
  padding-top: 1.25rem;
  border-top: 1px solid var(--border);
  display: flex;
  flex-direction: column;
  gap: 0.35rem;
  font-size: 0.85rem;
}

.contact-label {
  margin: 0 0 0.25rem;
  font-size: 0.7rem;
  text-transform: uppercase;
  letter-spacing: 0.08em;
  color: var(--muted);
}

.contact a {
  color: var(--x);
  text-decoration: none;
}

.contact a:hover {
  text-decoration: underline;
}