a1-headline-accent-chip

name	A1-headline-accent-chip
description	motion-graphic scene archetype — single bold headline anchored top-left with a chip in the bottom-right, with optional element-handoff into the next scene. canonical marshmallow / klarna sizzle scene. composes scale-bounce on headline + scale-bounce on chip with a 6-frame tier-2 offset.

A1 — headline + accent chip

Composes

• scale-bounce (on headline text)
• scale-bounce (on chip)
• element-handoff (when chip is a shared layer carrying into the next scene — most common case)

Layout

canvas: 1080x1920 (or pack-specified)

headline_zone:
  anchor: top-left
  origin: { x: 60, y: 240 }
  max_width_pct: 70
  align: left
  transform_origin: "left top"

chip_zone:
  anchor: bottom-right
  origin: { x: canvas_w - 220, y: canvas_h - 220 }
  diameter: 160
  reserved: true        # no text may enter this zone

The chip_zone is the reserved decoration band — text in headline_zone may NOT extend into it. The impl-brief atom enforces this via decoration_x_min = canvas_w - 220.

Choreography

tier_1:
  element: headline
  effect: scale-bounce
  delay_frames: 0
  peak_frame: 14
  settle_frame: 24

tier_2:
  element: chip
  effect: scale-bounce (if first scene with chip) | element-handoff (if continuing)
  delay_frames: 6           # arrives after headline lands
  peak_frame: 20

hold:
  start_frame: 30
  duration_frames: 30+      # at least 1.0s hold after motion

When the chip is a sharedLayer continuing from a prior scene, tier-2 becomes the chip's element-handoff entry — no pop, just a translate+rotate into the new position.

Style pack compatibility

supported: [SP-A, SP-B, SP-E, SP-G]
preferred_in: [SP-A]
incompatible: [SP-C, SP-D, SP-F]

SP-C (editorial-cinematic) and SP-D (editorial-magazine) don't use chips — they have different vocabularies (corner-ticker, brand-tag). SP-F (product-demo) replaces chips with the aurora-blob.

Duration range

duration_seconds: [1.6, 2.4]

Default 2.0s. Shorter than 1.6s feels rushed; longer than 2.4s loses snap.

Pack-specific param overrides

The impl-brief atom pulls these from each pack's motion-recipes.md. Defaults assume SP-A.

SP-A (marshmallow)

• headline: scale-bounce damping 12, overshoot 0.15
• chip: scale-bounce damping 14, overshoot 0.12
• bg: hard-cut on swap

SP-B (pinterest-saturated)

• headline: pop-in damping 18, overshoot 0.05 (softer, less candy-pop)
• chip: pinterest doesn't use chips → use a small sticker-chip-pop instead
• bg: hard-cut on bg-swap, with a doodle accent

SP-E (chaos-card)

• headline: scale-bounce + tilt -2° to +2°
• chip: scale-bounce + sticker-tilt-wobble after pop
• music_beat_anchor: required

SP-G (riso-illustration)

• headline: scale-bounce damping 16, overshoot 0.10
• chip: replaced with the recurring illustration object
• grain layer over both elements

Quality Checks

• Headline font_size × pack.type.char_width_factor × char_count × (1 + pack.motion.spring_overshoot_pct) ≤ pack.container.padding_safe_area_pct × canvas_w
• Chip x is in the reserved decoration zone (≥ canvas_w − 220 by default)
• Tier-2 delay ≥ pack's stagger_default_frames
• Hold phase ≥ 60% of total scene duration

Failure Modes

• Headline overflows safe area at spring peak → impl-brief reduces fontSize and logs the fix.
• Chip overlaps headline x-band → impl-brief halts with "chip x violates reserved zone".
• Tier-2 fires same frame as tier-1 → impl-brief logs warning; merges into tier-1 (no two-tier rhythm).