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Paper-summary posters previously required hand-written XML: every engine box rendered identically (white, 11px), so anything whose meaning lives in visual hierarchy came out flat. This makes presentation a first-class, generalised part of the declaration - not a poster feature. Structure/presentation separation, the same split HTML and CSS settled on: - ROLE says what a node IS: banner, heading, body, callout, good, bad, metric, muted. Maps to a type scale and an emphasis (filled / tinted / outlined / ghost), never to a colour. - GROUP says which semantic zone a node belongs to. Each distinct group name gets one hue ramp (tint / base / dark), assigned in document order. Promoted from a draw_graph-only field to BoxNode and GroupNode, round-tripped via dai_group. - themedStyle(role, hue, kind) composes the two by rule - there is no per-combination table to extend, so a new diagram kind gets full theming by tagging nodes. The model never sees a hex value. A heading container plus a group yields the tinted section panel with a dark title; a grouped body box takes its zone's tint; verdict roles stay green/red regardless of zone; the banner is the page's one dark field. Also fixed, found while building the acceptance poster: - autoBoxSize only counted explicit newlines, so a long single-line label wrapped to six lines in draw.io but got a one-line-tall box, and the text overflowed the cell. - Marker stamping appended without replacing, so every render of a recovered style grew it by one duplicate dai_* token per key - unnoticed because draw.io resolves duplicates last-wins. dai_* keys are now replaced in place; mxGraph keys still append, because last-wins is load-bearing for container=1 normalisation. - Banner/heading/metric roles stretch across their container's cross axis, the way a masthead spans its page. - Prompt: a poster's banner IS its title (no set_title alongside), and sections get their colour by naming groups. 537 unit tests, 250-flowchart corpus still zero crossing arrows, 5 e2e tests in a real browser. Verified visually: the Transformer-paper poster renders with a navy masthead, three hue-coded section panels, metric, verdict and callout boxes - all engine-computed geometry.