.sb-board {
  display: grid;
  gap: 0;
  background: rgba(20, 20, 58, 0.6);
  border: 1px solid rgba(19, 103, 229, 0.25);
  border-radius: 12px;
  padding: 8px;
  user-select: none;
}
.sb-cell {
  width: 44px; height: 44px;
  display: grid; place-items: center;
  font-size: 28px;
  position: relative;
  background: rgba(255, 255, 255, 0.02);
}
.sb-cell.wall {
  background: linear-gradient(135deg, #475569, #1e293b);
  box-shadow: inset 0 -3px 4px rgba(0,0,0,0.4), inset 0 2px 2px rgba(255,255,255,0.1);
}
.sb-cell.floor { background: rgba(255, 255, 255, 0.04); }
.sb-cell.target::after {
  content: '✦';
  position: absolute;
  font-size: 22px;
  color: rgba(34, 197, 94, 0.7);
  text-shadow: 0 0 10px rgba(34, 197, 94, 0.5);
  pointer-events: none;
}
.sb-cell.box     { background: linear-gradient(135deg, #b45309, #78350f); }
.sb-cell.box-on  { background: linear-gradient(135deg, #22c55e, #16a34a); box-shadow: 0 0 18px rgba(34, 197, 94, 0.5); }
.sb-cell .player {
  font-size: 30px;
  z-index: 2;
  filter: drop-shadow(0 2px 3px rgba(0,0,0,0.5));
}
.sb-cell .box-icon { font-size: 28px; z-index: 1; }

.dpad {
  display: grid;
  grid-template-columns: 50px 50px 50px;
  grid-template-rows: 50px 50px;
  gap: 4px;
  margin-top: 6px;
}
.dpad-btn {
  background: var(--surface-hi);
  border: 1px solid var(--border);
  color: var(--text);
  border-radius: 10px;
  font-family: inherit;
  font-size: 22px;
  cursor: pointer;
  display: grid; place-items: center;
  transition: background 0.15s;
}
.dpad-btn:hover { background: rgba(19, 103, 229, 0.3); }
.dp-up    { grid-column: 2; grid-row: 1; }
.dp-left  { grid-column: 1; grid-row: 2; }
.dp-down  { grid-column: 2; grid-row: 2; }
.dp-right { grid-column: 3; grid-row: 2; }

@media (max-width: 540px) {
  .sb-cell { width: 36px; height: 36px; font-size: 22px; }
}