.kak-board-wrap {
  display: flex;
  justify-content: center;
  overflow-x: auto;
  padding-bottom: 4px;
}

.kak-board {
  display: grid;
  gap: 1px;
  background: var(--border-strong);
  border: 2px solid var(--border-strong);
  border-radius: 8px;
  overflow: hidden;
}

.kak-cell {
  width: clamp(30px, 8vw, 46px);
  height: clamp(30px, 8vw, 46px);
  background: var(--cell-bg);
  position: relative;
  display: flex;
  align-items: center;
  justify-content: center;
}

.kak-cell.block {
  background: var(--cell-alt);
}
.kak-cell.block.border0 {
  background: transparent;
}
.kak-cell.block .clue-right,
.kak-cell.block .clue-down {
  position: absolute;
  font-size: clamp(0.5rem, 1.8vw, 0.62rem);
  font-weight: 700;
  color: var(--text-muted);
  line-height: 1;
}
.kak-cell.block .clue-right { top: 3px; right: 4px; }
.kak-cell.block .clue-down { bottom: 3px; left: 4px; }
.kak-cell.block.has-both::before {
  content: "";
  position: absolute;
  inset: 0;
  background: linear-gradient(to top right, transparent calc(50% - 0.5px), var(--border-strong) 50%, transparent calc(50% + 0.5px));
}

.kak-cell.white {
  cursor: pointer;
  border: none;
  padding: 0;
  font-family: var(--font-ui);
  font-size: clamp(0.85rem, 3vw, 1.15rem);
  font-weight: 700;
  color: var(--accent);
  transition: background 0.12s;
}
.kak-cell.white.run-hl { background: color-mix(in srgb, var(--accent) 12%, var(--cell-bg)); }
.kak-cell.white.selected { background: color-mix(in srgb, var(--accent) 32%, var(--cell-bg)); }
.kak-cell.white.correct { background: var(--success-bg); color: var(--success); }
.kak-cell.white.error { background: var(--danger-bg); color: var(--danger); }

.numpad {
  display: grid;
  grid-template-columns: repeat(9, 1fr);
  gap: 8px;
  max-width: 420px;
  margin: 18px auto 0;
}
.numpad-btn {
  padding: 10px 0;
  font-size: 1.1rem;
  font-weight: 600;
}

.actions-row {
  display: flex;
  flex-wrap: wrap;
  gap: 10px;
  justify-content: center;
  max-width: 420px;
  margin: 14px auto 0;
}

@media (max-width: 520px) {
  .numpad-btn { padding: 8px 0; font-size: 1rem; }
}