SKILL.md
Sprite Animation Skill
Produce a single animated frame of an educational explainer — the kind you might screen-record into a vertical video. Pixel-art mascots, big year display, looping CSS animations, kinetic Japanese / English display type.
Workflow
- Read the active DESIGN.md (injected above). Pick the loudest serif
token for the year, a sturdy sans for headlines, and a mono token for timeline / index labels.
- Pick the topic from the brief (e.g. "Nintendo · 1889 — Hanafuda").
You always need: a year, a one-line headline, an animated subject (a pixel sprite — character, object, or icon), and a short caption.
- Stage — full-bleed cream / off-white background (
#f5efe2) with a
subtle paper grain. Keep margins generous; this is one beat of a video.
- Top bar — small mono row:
- Left: title slug ("名次の/番組" or "EP. 01 / NINTENDO") - Right: progress dots ("01 / 12") and a "REC" stamp
- Subject animations — at least three independent looping animations
on the page: - Big year: the headline year (e.g. "1889年") fills the lower-left, in a serif display weight. It has a subtle vertical glitch / scanline animation (clip-path keyframes), and a 1-frame "pop" every loop. - Pixel sprite card: a 96×128 pixel-art card or character (use an inline SVG with crisp shape-rendering: crispEdges rectangles, or a box-shadow pixel grid). Subtle bobbing animation (±4px, 1.6s). - Kinetic kana: 1–2 Japanese / kanji characters that fade-and-slide in sync with the bob (e.g. "花" — hana — flower). - Tick ribbon: bottom of the stage, a tape/ribbon with year ticks (1889 · 1907 · 1949 · 1977 · 1985 · 2006 · 2017) sliding left at a slow constant speed.
- Caption block — small mono caption explaining the trivia:
"Nintendo started as a Hanafuda playing-card maker in Kyoto, 1889. Mario didn't show up for another ninety-six years."
- Write a single HTML document:
- <!doctype html> through </html>, CSS inline, no external JS. - All animations use @keyframes + animation: ... infinite. - Stage uses a fixed canvas ratio (e.g. 16:9 letterboxed) so the loop reads as a single frame from a video. - data-od-id on stage, year, sprite, caption, and tick ribbon.
- Self-check:
- The page is one cohesive scene, not a collage. The eye lands on the year first, then the sprite, then the caption. - At least 3 independent looping animations are visible. - The color palette is restrained (cream + a single accent red + ink). - No external assets — all sprites are inline SVG or CSS.
Output contract
Emit between <artifact> tags:
<artifact identifier="sprite-anim-slug" type="text/html" title="Sprite animation — Title">
<!doctype html>
<html>...</html>
</artifact>One sentence before the artifact, nothing after.