.ub-board {
  display: grid;
  grid-template-columns: repeat(6, 1fr);
  gap: 4px;
  width: 100%;
  max-width: 420px;
  margin: 0 auto;
  aspect-ratio: 1 / 1;
  background: rgba(0, 0, 0, 0.3);
  padding: 6px;
  border-radius: 12px;
}
.ub-cell {
  border-radius: 6px;
  background: rgba(255, 255, 255, 0.03);
  display: flex;
  align-items: center;
  justify-content: center;
  font-weight: 800;
  font-size: clamp(0.7rem, 2.4vw, 1.1rem);
  color: #08111f;
}
.ub-exit { box-shadow: inset 0 0 0 2px rgba(255, 179, 71, 0.6); }
.ub-piece { background: linear-gradient(160deg, #9be7ff, #4a7fd6); color: #08243f; cursor: pointer; }
.ub-piece--target { background: linear-gradient(160deg, #ffd59e, #e07b2c); color: #3a1e08; }
.ub-piece--sel { outline: 3px solid #ffb347; }
.ub-dpad {
  display: grid;
  grid-template-columns: repeat(3, 46px);
  grid-template-rows: repeat(3, 46px);
  gap: 0.3rem;
  justify-content: center;
  margin: 0.6rem auto 0;
}
.ub-dpad button {
  border-radius: 12px;
  border: 1px solid rgba(255, 255, 255, 0.16);
  background: rgba(255, 255, 255, 0.06);
  color: #d9ebff;
  font-size: 1.1rem;
  cursor: pointer;
}
.ub-dpad__up { grid-area: 1 / 2; }
.ub-dpad__left { grid-area: 2 / 1; }
.ub-dpad__right { grid-area: 2 / 3; }
.ub-dpad__down { grid-area: 3 / 2; }