/* Thème Morpion : néon lumineux */
body.morpion-theme {
  --bg-color: #060a16;
  --surface-color: #0c1428;
  --accent-color: #35d0ff;
}

.board {
  position: relative;
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 4px;
  max-width: 320px;
  margin: 20px auto;
  padding: 10px;
  background: #081020;
  border-radius: 16px;
  border: 2px solid #1c3a5e;
  box-shadow: 0 0 18px rgba(53, 208, 255, 0.25), inset 0 0 20px rgba(53, 208, 255, 0.08);
}

.cell {
  position: relative;
  aspect-ratio: 1;
  background: var(--surface-color);
  border-radius: 10px;
  border: 1px solid #1c3a5e;
  display: flex;
  align-items: center;
  justify-content: center;
  font-size: 46px;
  font-weight: 800;
  cursor: pointer;
  user-select: none;
}

.cell.taken { cursor: default; }

.cell.x {
  color: #35d0ff;
  text-shadow: 0 0 8px #35d0ff, 0 0 18px #35d0ff, 0 0 30px rgba(53,208,255,0.6);
}

.cell.o {
  color: #ff4d6d;
  text-shadow: 0 0 8px #ff4d6d, 0 0 18px #ff4d6d, 0 0 30px rgba(255,77,109,0.6);
}

.win-line-overlay {
  position: absolute;
  inset: 10px;
  pointer-events: none;
}

.win-line-overlay line {
  stroke: #f4f4f8;
  stroke-width: 6;
  stroke-linecap: round;
  filter: drop-shadow(0 0 6px #ffffff) drop-shadow(0 0 14px #35d0ff);
}