.xq-board {
  display: grid;
  grid-template-columns: repeat(9, 1fr);
  gap: 2px;
  width: min(94vw, 420px);
  margin: 14px auto;
  background: #e8c887;
  padding: 8px;
  border-radius: 10px;
  user-select: none;
}
.xq-cell {
  aspect-ratio: 1 / 1;
  display: flex;
  align-items: center;
  justify-content: center;
  position: relative;
  cursor: pointer;
}
.xq-cell.r4 { border-bottom: 2px solid #c79b4f; }
.xq-cell.r5 { border-top: 2px solid #c79b4f; }
.xq-piece {
  width: 86%;
  height: 86%;
  border-radius: 50%;
  background: #fdf6e3;
  border: 2px solid #8a6d2f;
  display: flex;
  align-items: center;
  justify-content: center;
  font-size: clamp(16px, 5vw, 26px);
  font-weight: 800;
  line-height: 1;
}
.xq-piece.red { color: #d33; }
.xq-piece.black { color: #222; }
.xq-cell.sel .xq-piece { box-shadow: 0 0 0 3px #4d96ff; }
.xq-cell.target::after {
  content: "";
  position: absolute;
  width: 26%;
  height: 26%;
  border-radius: 50%;
  background: rgba(77, 150, 255, 0.55);
}
.xq-cell.lastmove { background: rgba(107, 203, 119, 0.35); }