Chapter Title Card

At a section break, a full-screen color slab wipes in over 0.3s to cover the frame; a chapter number at 40% of screen height lands first, the chapter name then reveals from a mask beside it; after a 1.2s hold, the slab sweeps out in the same direction, cutting back to the narration; each chapter carries its own theme (bg / ink / accent) plus a line-art motif tied to its content, drawn in the background right after the slab covers, and an accent rule grows under the chapter name