body {
  margin: 0;
  font-family: system-ui, -apple-system, BlinkMacSystemFont, "Segoe UI", sans-serif;
  background: #f8fafc;
  color: #0f172a;
}

.puzzle-page {
  max-width: 980px;
  margin: 0 auto;
  padding: 24px;
}

.puzzle-page h1 {
  margin: 0 0 16px;
  font-size: 1.6rem;
}

.solver-status {
  margin: 0 0 14px;
  font-weight: 600;
}

.solution-nav {
  display: flex;
  gap: 10px;
  margin: 0 0 16px;
}

.solution-button {
  padding: 8px 12px;
  border: 1px solid #94a3b8;
  border-radius: 8px;
  background: #ffffff;
  color: #0f172a;
  font-weight: 600;
  cursor: pointer;
}

.solution-button:disabled {
  opacity: 0.55;
  cursor: not-allowed;
}

.autoplay-controls {
  display: grid;
  grid-template-columns: auto 1fr;
  gap: 8px 14px;
  align-items: center;
  margin: 0 0 16px;
}

.controls {
  display: grid;
  grid-template-columns: auto 1fr;
  gap: 8px 14px;
  align-items: center;
  margin-bottom: 20px;
}

.scene {
  height: 460px;
  border-radius: 12px;
  background: linear-gradient(180deg, #e2e8f0 0%, #cbd5e1 100%);
  border: 1px solid #cbd5e1;
  display: grid;
  place-items: center;
  perspective: 1000px;
  margin-bottom: 16px;
  cursor: grab;
  user-select: none;
  touch-action: none;
}

.scene.dragging {
  cursor: grabbing;
}

.grid-3d {
  position: relative;
  width: 0;
  height: 0;
  transform-style: preserve-3d;
}

.cube {
  position: absolute;
  border-radius: 6px;
  box-shadow: inset 0 0 0 1px rgba(15, 23, 42, 0.22), 0 8px 20px rgba(15, 23, 42, 0.18);
}

.legend {
  display: flex;
  flex-wrap: wrap;
  gap: 10px 16px;
}

.legend-item {
  display: inline-flex;
  align-items: center;
  gap: 8px;
  font-weight: 600;
}

.legend-swatch {
  width: 16px;
  height: 16px;
  border-radius: 4px;
  display: inline-block;
  border: 1px solid rgba(15, 23, 42, 0.25);
}