.schulte {
  display: grid;
  justify-items: center;
  gap: 1.1rem;
  margin-top: 1.2rem;
  padding: 1.4rem 1rem 1.5rem;
  background: var(--surface);
  border: 1px solid var(--line);
  border-radius: 24px;
  box-shadow: var(--shadow);
}

.grid {
  display: grid;
  grid-template-columns: repeat(5, minmax(0, 1fr));
  gap: 0.45rem;
  width: min(22rem, 100%);
  position: relative;
}

.cell {
  aspect-ratio: 1;
  display: flex;
  align-items: center;
  justify-content: center;
  padding: 0;
  border: 1px solid var(--line);
  border-radius: 12px;
  background: #fff;
  color: var(--ink);
  font: inherit;
  font-family: var(--serif);
  font-size: clamp(1.25rem, 4.5vw, 1.7rem);
  font-weight: 600;
  cursor: pointer;
  user-select: none;
}

.cell:active:not(:disabled) { background: #f7f1e6; }

.cell:disabled {
  background: var(--green-soft);
  border-color: #b7e0c8;
  color: var(--muted);
  cursor: default;
}

.cell.is-idle:disabled {
  background: #fff;
  border-color: var(--line);
  cursor: default;
}

.center-dot {
  position: absolute;
  top: 50%;
  left: 50%;
  z-index: 1;
  width: 8px;
  height: 8px;
  border-radius: 50%;
  background: rgba(198, 40, 40, 0.45);
  transform: translate(-50%, -50%);
  pointer-events: none;
}