.gomoku-board {
  display: grid;
  grid-template-columns: repeat(13, 28px);
  grid-template-rows: repeat(13, 28px);
  gap: 1px;
  background: var(--wood-900);
  padding: 8px;
  border-radius: 6px;
}

@media (max-width: 560px) {
  .gomoku-board { grid-template-columns: repeat(13, 5.2vw); grid-template-rows: repeat(13, 5.2vw); }
}

.gomoku-cell {
  border: none;
  background: var(--parchment-300);
  cursor: pointer;
  padding: 0;
  display: flex;
  align-items: center;
  justify-content: center;
}

.gomoku-cell.winning {
  background: var(--brass-500);
}

.gomoku-stone {
  width: 78%;
  height: 78%;
  border-radius: 50%;
  box-shadow: 0 2px 3px rgba(0, 0, 0, 0.5), 0 1px 0 rgba(255, 255, 255, 0.2) inset;
}
.gomoku-stone.p0 { background: radial-gradient(circle at 32% 26%, var(--wine-500), var(--wine-800) 80%); }
.gomoku-stone.p1 { background: radial-gradient(circle at 32% 26%, var(--brass-500), var(--brass-800) 80%); }