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skills/sprite-animation/SKILL.md
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---
name: sprite-animation
description: |
A pixel / sprite-style animated explainer slide — full-bleed cream stage,
bold display year, animated pixel-art mascot (e.g. Hanafuda card, mushroom,
or 8-bit console), kinetic Japanese display type, ticking timeline ribbon.
Reads like a single frame of an educational motion video — looping CSS
keyframes, no JS, ready to be screen-recorded into a vertical video.
Use when the brief asks for a "sprite animation", "pixel-art video",
"8-bit explainer", "history of X explainer", "kinetic typography history",
"Nintendo-style", "精灵图动画", "像素动画", or "复古动画".
triggers:
- "sprite animation"
- "pixel art animation"
- "8-bit explainer"
- "retro animation"
- "kinetic typography"
- "history explainer"
- "nintendo style"
- "精灵图"
- "像素动画"
- "复古动画"
od:
mode: prototype
platform: desktop
scenario: marketing
featured: 8
preview:
type: html
entry: index.html
design_system:
requires: true
sections: [color, typography, layout, components]
example_prompt: "Create a sprite-based animation introducing trivia about Nintendo's history. Combine pixel mascots, animated text, and a Hanafuda accent. Use color and type that feel like the Nintendo brand."
---
# 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
1. **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.
2. **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.
3. **Stage** — full-bleed cream / off-white background (`#f5efe2`) with a
subtle paper grain. Keep margins generous; this is one beat of a video.
4. **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
5. **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.
6. **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."
7. **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.
8. **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.
skills/sprite-animation/example.html
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<!doctype html>
<html lang="en">
<head>
<meta charset="utf-8" />
<meta name="viewport" content="width=device-width, initial-scale=1" />
<title>Nintendo, 1889 — sprite animation</title>
<link rel="preconnect" href="https://fonts.googleapis.com" />
<link rel="preconnect" href="https://fonts.gstatic.com" crossorigin />
<link href="https://fonts.googleapis.com/css2?family=DM+Serif+Display:ital@0;1&family=IBM+Plex+Mono:wght@400;500&family=Noto+Serif+JP:wght@500;700&family=Press+Start+2P&display=swap" rel="stylesheet" />
<style>
:root {
--paper: #f5efe2;
--paper-2: #ede4d0;
--ink: #181612;
--accent: #d92b1c;
--muted: #6f6a60;
--serif: 'DM Serif Display', 'Iowan Old Style', Georgia, serif;
--jp: 'Noto Serif JP', serif;
--mono: 'IBM Plex Mono', ui-monospace, monospace;
--pixel: 'Press Start 2P', monospace;
}
* { box-sizing: border-box; }
html, body { margin: 0; }
body {
min-height: 100vh;
background: #1a1816;
color: var(--ink);
font: 14px/1.5 -apple-system, system-ui, sans-serif;
display: flex; align-items: center; justify-content: center;
padding: 24px;
}
.stage {
width: min(1280px, 100%);
aspect-ratio: 16 / 9;
position: relative;
overflow: hidden;
background: var(--paper);
background-image:
radial-gradient(rgba(120,90,40,0.06) 1px, transparent 1px),
radial-gradient(rgba(120,90,40,0.04) 1px, transparent 1px);
background-size: 4px 4px, 7px 7px;
background-position: 0 0, 2px 3px;
box-shadow: 0 30px 80px rgba(0,0,0,0.5), 0 0 0 1px rgba(0,0,0,0.05);
border-radius: 4px;
}
.stage::before {
content: ''; position: absolute; inset: 0;
background: linear-gradient(180deg, rgba(0,0,0,0.04) 0%, transparent 8%, transparent 92%, rgba(0,0,0,0.05) 100%);
pointer-events: none;
}
/* top bar */
.topbar { position: absolute; top: 0; left: 0; right: 0; padding: 22px 32px; display: flex; justify-content: space-between; align-items: center; font: 11px/1 var(--mono); color: var(--muted); letter-spacing: 0.18em; text-transform: uppercase; }
.topbar .slug { display: inline-flex; align-items: center; gap: 10px; }
.topbar .slug .jp { font-family: var(--jp); font-weight: 700; color: var(--ink); letter-spacing: 0.05em; text-transform: none; font-size: 13px; }
.topbar .slug .en { color: var(--muted); }
.topbar .progress { display: inline-flex; align-items: center; gap: 12px; }
.topbar .progress .dots { display: inline-flex; gap: 4px; }
.topbar .progress .dots i { width: 6px; height: 6px; border-radius: 50%; background: var(--ink); display: inline-block; opacity: 0.18; }
.topbar .progress .dots i.on { opacity: 1; }
.topbar .rec { display: inline-flex; align-items: center; gap: 6px; padding: 4px 8px; border: 1px solid var(--ink); color: var(--ink); }
.topbar .rec::before { content: ''; width: 7px; height: 7px; border-radius: 50%; background: var(--accent); animation: blink 1.2s steps(2) infinite; }
@keyframes blink { 50% { opacity: 0.2; } }
/* big year */
.year { position: absolute; left: 6%; bottom: 14%; font: 700 200px/0.85 var(--serif); color: var(--ink); letter-spacing: -0.03em; }
.year .num { display: inline-block; position: relative; }
.year .num .glitch {
position: absolute; left: 0; top: 0; color: var(--accent);
clip-path: inset(0 0 70% 0);
animation: glitch 4s steps(8) infinite;
mix-blend-mode: multiply;
}
@keyframes glitch {
0%, 88%, 100% { clip-path: inset(0 0 100% 0); transform: translate(0,0); opacity: 0; }
89% { clip-path: inset(20% 0 60% 0); transform: translate(2px, -1px); opacity: 0.7; }
91% { clip-path: inset(60% 0 20% 0); transform: translate(-2px, 1px); opacity: 0.7; }
94% { clip-path: inset(40% 0 40% 0); transform: translate(1px, 0); opacity: 0.6; }
97% { clip-path: inset(0 0 100% 0); transform: translate(0,0); opacity: 0; }
}
.year .jp-suffix { font-family: var(--jp); font-weight: 700; font-size: 0.6em; vertical-align: 0.16em; margin-left: 0.04em; }
.year-label { position: absolute; left: 6%; bottom: calc(14% + 200px + 12px); font: 11px/1.2 var(--mono); letter-spacing: 0.22em; color: var(--muted); text-transform: uppercase; }
.year-label::before { content: ''; display: inline-block; width: 24px; height: 1px; background: var(--ink); vertical-align: middle; margin-right: 10px; opacity: 0.5; }
/* sprite card */
.sprite-stack {
position: absolute; right: 12%; top: 22%;
display: flex; flex-direction: column; align-items: center; gap: 22px;
animation: bob 2.4s ease-in-out infinite;
}
@keyframes bob {
0%, 100% { transform: translateY(0); }
50% { transform: translateY(-8px); }
}
.sprite-card {
width: 168px; height: 252px;
background: var(--paper-2);
border: 4px solid var(--ink);
border-radius: 10px;
box-shadow: 8px 8px 0 var(--ink);
position: relative;
padding: 12px;
display: flex; flex-direction: column; align-items: center;
image-rendering: pixelated;
}
.sprite-card::before, .sprite-card::after {
content: ''; position: absolute; left: 8px; right: 8px; height: 4px; background: var(--ink);
}
.sprite-card::before { top: 14px; }
.sprite-card::after { bottom: 14px; }
.sprite-card svg { display: block; image-rendering: pixelated; shape-rendering: crispEdges; margin-top: 18px; }
.sprite-tag { font-family: var(--jp); font-weight: 700; font-size: 28px; color: var(--accent); margin-top: auto; line-height: 1; letter-spacing: 0.06em; }
.sprite-tag small { display: block; font-family: var(--mono); font-weight: 500; font-size: 10px; color: var(--muted); letter-spacing: 0.18em; margin-top: 4px; text-transform: uppercase; }
/* kinetic kana */
.kana { position: absolute; right: 6%; top: 12%; font-family: var(--jp); font-weight: 700; font-size: 96px; color: var(--ink); line-height: 1; letter-spacing: 0; }
.kana span { display: inline-block; opacity: 0; animation: kana-in 4s ease-in-out infinite; }
.kana span:nth-child(1) { animation-delay: 0s; }
.kana span:nth-child(2) { animation-delay: 0.4s; }
@keyframes kana-in {
0% { opacity: 0; transform: translateY(-12px); }
18%, 78% { opacity: 1; transform: translateY(0); }
100% { opacity: 0; transform: translateY(8px); }
}
/* caption block */
.caption {
position: absolute; left: 6%; right: 50%; bottom: 6%;
font: 12px/1.5 var(--mono); color: var(--ink);
letter-spacing: 0.04em;
max-width: 32ch;
}
.caption strong { display: block; font-family: var(--serif); font-weight: 400; font-style: italic; font-size: 18px; letter-spacing: -0.005em; margin-bottom: 6px; color: var(--ink); }
/* tick ribbon */
.ribbon {
position: absolute; left: 0; right: 0; bottom: 0;
height: 36px;
background: var(--ink);
color: var(--paper);
overflow: hidden;
display: flex; align-items: center;
}
.ribbon-track {
display: inline-flex; gap: 64px;
padding: 0 32px;
animation: scroll-left 22s linear infinite;
white-space: nowrap;
flex-shrink: 0;
}
.ribbon-track .tick { display: inline-flex; align-items: center; gap: 8px; font: 11px/1 var(--mono); letter-spacing: 0.22em; }
.ribbon-track .tick .dot { width: 6px; height: 6px; background: var(--accent); border-radius: 50%; }
.ribbon-track .tick .label { color: var(--paper); }
.ribbon-track .tick .note { color: rgba(245,239,226,0.55); text-transform: uppercase; }
@keyframes scroll-left {
from { transform: translateX(0); }
to { transform: translateX(-50%); }
}
/* corner registration marks */
.reg { position: absolute; width: 14px; height: 14px; border: 1px solid var(--ink); opacity: 0.35; }
.reg.tl { top: 14px; left: 14px; border-right: none; border-bottom: none; }
.reg.tr { top: 14px; right: 14px; border-left: none; border-bottom: none; }
.reg.bl { bottom: 50px; left: 14px; border-right: none; border-top: none; }
.reg.br { bottom: 50px; right: 14px; border-left: none; border-top: none; }
@media (max-width: 900px) {
.year { font-size: 120px; bottom: 18%; }
.year-label { bottom: calc(18% + 120px + 8px); }
.kana { font-size: 64px; }
.sprite-stack { right: 8%; top: 26%; }
.sprite-card { width: 124px; height: 184px; }
}
</style>
</head>
<body>
<div class="stage" data-od-id="stage">
<span class="reg tl"></span>
<span class="reg tr"></span>
<span class="reg bl"></span>
<span class="reg br"></span>
<div class="topbar" data-od-id="topbar">
<div class="slug">
<span class="jp">名次の番組</span>
<span class="en">EP. 01 · NINTENDO TRIVIA</span>
</div>
<div class="progress">
<span class="dots"><i class="on"></i><i></i><i></i><i></i><i></i><i></i><i></i><i></i><i></i><i></i><i></i><i></i></span>
<span>01 / 12</span>
<span class="rec">REC</span>
</div>
</div>
<div class="kana" data-od-id="kana"><span>花</span><span>札</span></div>
<div class="year-label" data-od-id="year-label">CHAPTER 01 · KYOTO · A PLAYING-CARD COMPANY</div>
<div class="year" data-od-id="year">
<span class="num">
1889
<span class="glitch" aria-hidden="true">1889</span>
</span><span class="jp-suffix">年</span>
</div>
<div class="sprite-stack" data-od-id="sprite">
<div class="sprite-card">
<!-- Hanafuda card sprite — pixel-art flower -->
<svg width="120" height="160" viewBox="0 0 24 32" xmlns="http://www.w3.org/2000/svg" aria-label="Hanafuda card">
<!-- background -->
<rect x="0" y="0" width="24" height="32" fill="#f5efe2"/>
<!-- moon glow -->
<rect x="3" y="2" width="18" height="10" fill="#1a1614"/>
<!-- moon -->
<rect x="14" y="4" width="5" height="5" fill="#f7c95b"/>
<rect x="13" y="5" width="1" height="3" fill="#f7c95b"/>
<rect x="19" y="5" width="1" height="3" fill="#f7c95b"/>
<!-- petals (red) -->
<rect x="9" y="14" width="6" height="2" fill="#d92b1c"/>
<rect x="7" y="16" width="10" height="2" fill="#d92b1c"/>
<rect x="6" y="18" width="12" height="2" fill="#d92b1c"/>
<rect x="7" y="20" width="10" height="2" fill="#d92b1c"/>
<rect x="9" y="22" width="6" height="2" fill="#d92b1c"/>
<!-- petal highlights -->
<rect x="10" y="15" width="2" height="1" fill="#ff6b5e"/>
<rect x="8" y="17" width="2" height="1" fill="#ff6b5e"/>
<rect x="14" y="19" width="2" height="1" fill="#ff6b5e"/>
<!-- center -->
<rect x="11" y="18" width="2" height="2" fill="#f7c95b"/>
<!-- stem / leaves -->
<rect x="11" y="24" width="2" height="6" fill="#3b6b3b"/>
<rect x="8" y="26" width="3" height="2" fill="#3b6b3b"/>
<rect x="13" y="27" width="3" height="2" fill="#3b6b3b"/>
</svg>
<div class="sprite-tag">花<small>HANA · FLOWER</small></div>
</div>
</div>
<div class="caption" data-od-id="caption">
<strong>Nintendo started as a hanafuda maker.</strong>
Founded in Kyoto by Fusajiro Yamauchi to print hand-painted playing
cards. Mario wouldn&rsquo;t show up for another <em>ninety-six</em> years.
</div>
<div class="ribbon" data-od-id="ribbon">
<div class="ribbon-track">
<div class="tick"><span class="dot"></span><span class="label">1889</span><span class="note">HANAFUDA · KYOTO</span></div>
<div class="tick"><span class="dot"></span><span class="label">1907</span><span class="note">WESTERN CARDS</span></div>
<div class="tick"><span class="dot"></span><span class="label">1949</span><span class="note">YAMAUCHI III</span></div>
<div class="tick"><span class="dot"></span><span class="label">1977</span><span class="note">COLOR TV-GAME</span></div>
<div class="tick"><span class="dot"></span><span class="label">1985</span><span class="note">SUPER MARIO BROS.</span></div>
<div class="tick"><span class="dot"></span><span class="label">2006</span><span class="note">WII</span></div>
<div class="tick"><span class="dot"></span><span class="label">2017</span><span class="note">SWITCH</span></div>
<div class="tick"><span class="dot"></span><span class="label">1889</span><span class="note">HANAFUDA · KYOTO</span></div>
<div class="tick"><span class="dot"></span><span class="label">1907</span><span class="note">WESTERN CARDS</span></div>
<div class="tick"><span class="dot"></span><span class="label">1949</span><span class="note">YAMAUCHI III</span></div>
<div class="tick"><span class="dot"></span><span class="label">1977</span><span class="note">COLOR TV-GAME</span></div>
<div class="tick"><span class="dot"></span><span class="label">1985</span><span class="note">SUPER MARIO BROS.</span></div>
<div class="tick"><span class="dot"></span><span class="label">2006</span><span class="note">WII</span></div>
<div class="tick"><span class="dot"></span><span class="label">2017</span><span class="note">SWITCH</span></div>
</div>
</div>
</div>
</body>
</html>