How it works

• The swirl pen-traces over the full draw duration using stroke-dashoffset 1 → 0.
• The swirl duration is split into 8 slots; each block starts in its own slot.
• Each block uses the same trace-then-fill pattern, but compressed to fit its slot.
• Spatial order: top-left → top-mid → mid-left → mid-mid → mid-right → bot-left → bot-mid → bot-right.