.flood-board {
  display: grid;
  grid-template-columns: repeat(12, 1fr);
  gap: 2px;
  width: min(92vw, 360px);
  margin: 10px auto;
  aspect-ratio: 1 / 1;
}
.fcell {
  border-radius: 3px;
  width: 100%;
  height: 100%;
}
.palette {
  display: flex;
  gap: 8px;
  justify-content: center;
  margin: 12px 0;
  flex-wrap: wrap;
}
.pal-btn {
  width: 40px;
  height: 40px;
  border-radius: 50%;
  border: 3px solid rgba(0, 0, 0, 0.15);
  cursor: pointer;
}
.pal-btn:active {
  transform: scale(0.92);
}
.hud b { color: var(--ink); }