.aq-board {
  display: grid;
  gap: 2px;
  margin: 8px auto;
  width: max-content;
  background: #dde4ee;
  padding: 5px;
  border-radius: 10px;
}
.aq-cell {
  width: 40px;
  height: 40px;
  border-radius: 6px;
  display: flex;
  align-items: center;
  justify-content: center;
  cursor: pointer;
  user-select: none;
  font-size: 12px;
  color: #1f6fb5;
  font-weight: 700;
  transition: background .12s;
}
.aq-cell.water { background: #4d96ff; color: #fff; }
.aq-w {
  display: flex;
  align-items: center;
  justify-content: center;
  width: 40px;
  height: 40px;
  font-weight: 700;
  color: #c0392b;
  font-size: 14px;
}
.aq-w.row { color: #16a085; }
.aq-corner { width: 40px; height: 40px; }