:root {
  /* --bg: #020617; */
  --card: #020617;
  --card-border: #111827;
  --accent-x: #38bdf8;
  --accent-o: #f97316;
  --text: #e5e7eb;
  --muted: #9ca3af;
  --cell-border: #1f2937;
  --win: #22c55e;
}

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

body {
  font-family: sans-serif;
  background-color: var(--bg);
  color: var(--text);
  min-height: 100vh;
  display: flex;
  justify-content: center;
  align-items: center;
  padding: 24px 16px;
}

.app {
  width: 100%;
  max-width: 420px;
  background-color: var(--card);
  border-radius: 20px;
  border: 1px solid var(--card-border);
  box-shadow: 0 20px 60px rgba(15, 23, 42, 0.9);
  padding: 20px 20px 16px;
}

.header {
  text-align: center;
  margin-bottom: 16px;
}

.header h1 {
  font-size: 1.8rem;
  margin-bottom: 4px;
}

.header p {
  font-size: 0.9rem;
  color: var(--muted);
}

.badge {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  padding: 1px 8px;
  border-radius: 999px;
  border: 1px solid var(--accent-x);
  color: var(--accent-x);
  font-size: 0.8rem;
}

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

.main {
  margin-top: 8px;
}

.status-bar {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 10px;
  margin-bottom: 12px;
  font-size: 0.9rem;
}

.status-text {
  color: var(--muted);
}

.reset-btn {
  padding: 6px 12px;
  border-radius: 999px;
  border: 1px solid var(--cell-border);
  background-color: #020617;
  color: var(--text);
  font-size: 0.8rem;
  cursor: pointer;
}

.reset-btn:hover {
  border-color: var(--accent-x);
}

.board {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 8px;
}

.cell {
  width: 100%;
  aspect-ratio: 1 / 1; /* width & height */
  background-color: #020617;
  border-radius: 12px;
  border: 1px solid var(--cell-border);
  display: flex;
  align-items: center;
  justify-content: center;
  font-size: 2.2rem;
  font-weight: 600;
  color: var(--text);
  cursor: pointer;
  transition: all 0.15s ease;
}

.cell:hover {
  border-color: #334155;
}

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

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

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

.cell.win {
  border-color: var(--win);
  box-shadow: 0 0 0 1px rgba(34, 197, 94, 0.7);
}

.cell:disabled {
  cursor: not-allowed;
}

.footer {
  margin-top: 14px;
  padding-top: 8px;
  border-top: 1px solid var(--card-border);
  font-size: 0.8rem;
  color: var(--muted);
  text-align: center;
}