Tweaks Skill · 参数化变体面板

Wrap any HTML artifact with a side panel of live controls that rewrite CSS custom properties in real time and persist to

localStorage

. Inspired by the huashu-design tweak pattern.

What you produce

A single self-contained HTML file with two layers:

Stage — the original artifact (landing page / deck / dashboard) re-keyed so all visual decisions read from CSS custom properties:
```
--accent
```
,
```
--scale
```
,
```
--density
```
,
```
--mode
```
,
```
--motion
```
.
Panel — a fixed sidebar (or drawer on small viewports) with form controls bound to those custom properties via a tiny vanilla-JS bridge. Persists every change to
```
localStorage
```
keyed by the artifact identifier.

The user can:

Open the artifact and see the stage rendered with their saved preferences (or sensible defaults).
Adjust accent / scale / density / mode / motion in the panel and watch the stage update instantly — no rerender.
Press <kbd>T</kbd> to hide / reveal the panel; <kbd>R</kbd> to reset to defaults.
Refresh the page — every choice is persisted.

When to use

The user generated something they like 80% of, and wants to dial in the last 20% themselves.
You're presenting a design system / brand and want the audience to feel the variants live (instead of you re-running the agent).
You're shipping a stand-alone demo (e.g. a portfolio piece) and want viewers to play.

When not to use

One-shot artifacts that won't be iterated on (e.g. a runbook — parameters don't help).
When the artifact's value is in fixed ratios (e.g. an infographic with carefully balanced data viz — knobs would degrade it).

The 5 standard knobs

Pick a subset that suits the artifact. Don't ship all 5 if only 2 matter — clutter is a regression.

--accent

— Accent color

A select with 5–8 curated swatches (don't ship a free color picker — the user will pick a bad color and blame you).

const ACCENT_PRESETS = [
  { id: 'rust',    val: '#c96442', label: 'Rust' },
  { id: 'cobalt',  val: '#2c4d8e', label: 'Cobalt' },
  { id: 'sage',    val: '#4a7a3f', label: 'Sage' },
  { id: 'plum',    val: '#7a3f6a', label: 'Plum' },
  { id: 'graphite',val: '#3a3a3a', label: 'Graphite' },
];

The artifact uses

var(--accent)

everywhere it had a hard-coded accent before. Border / link / pull-quote rule / CTA all flip together.

--scale

— Type scale (0.85 / 1.0 / 1.15)

Three settings: Compact (0.85), Normal (1.0), Generous (1.15). All

font-size

declarations multiply by

var(--scale)

via

calc(... * var(--scale))

Don't go beyond ±15% — beyond that the layout breaks (column flow, breakpoints, line counts).

--density

— Layout density (Tight / Normal / Roomy)

Three settings that swap the spacing scale: Tight (0.75) / Normal (1.0) / Roomy (1.4). All

padding

gap

margin

declarations multiply by

var(--density)

This is the highest-impact knob — it's also the most fragile, so every layout-critical container must declare its base spacing in custom properties before you wrap.

--mode

— Light / Dark

A 2-state toggle. Sets

data-mode="light"

"dark"

on the

<html>

element and the artifact's

:root

selector responds with two color sets.

If the artifact already has a media-query-based dark mode, replace it with the data-attr version — the user's choice should win over their OS.

--motion

— Off / Subtle / Lively

Three settings. Maps to a CSS variable

--motion-mult

that scales all

transition-duration

animation-duration

declarations:

Off —
```
0s
```
(also disables WebGL canvases / decorative animation).
Subtle —
```
1.0
```
(the artifact's authored timing).
Lively —
```
1.6
```
(slower transitions, more visible motion).

Respect

prefers-reduced-motion

: default to Off if the user has that set, regardless of stored preference.

Implementation primitives

Read

assets/wrap.html

— it ships the panel + bridge as an inert template. Your job is to:

Take the user's existing artifact HTML.
Lift its accent / mode / spacing / scale into custom properties (search for hard-coded
```
#hex
```
/
```
Npx
```
/
```
Nrem
```
and convert).
Paste the contents into the marked region of
```
wrap.html
```
.
Edit
```
assets/wrap.html
```
's
```
KNOBS
```
array to keep only the knobs you decided are relevant to this artifact. Don't ship 5 if 2 matter.
Patch the
```
STORAGE_KEY
```
to a unique slug (
```
tweaks-<artifact-slug>
```
).

The bridge in

wrap.html

Loads
```
localStorage[STORAGE_KEY]
```
JSON on first paint.

Applies values as

document.documentElement.style.setProperty('--accent', ...)

Listens to every form control's
```
change
```
event and writes back.
Exposes <kbd>T</kbd> (toggle panel) and <kbd>R</kbd> (reset).

Workflow

Step 1 — Acquire the artifact

Same options as the critique skill:

Project file (
```
index.html
```
in the project folder).
Pasted HTML in the chat.
Generated by you in this turn.

Step 2 — Decide which knobs apply

Read the artifact's CSS first. For each knob, decide yes / no:

```
--accent
```
— yes if the artifact has 1 accent color used ≥ 3 times.
```
--scale
```
— yes if the artifact is type-driven (article, deck, pricing page).
```
--density
```
— yes if the artifact has consistent gap / padding rhythm (deck, dashboard, landing). No for runbooks (already dense).
```
--mode
```
— yes if the artifact has authored dark mode tokens, or you're willing to derive them.
```
--motion
```
— yes if the artifact has any transition / animation worth scaling. No for static reports / critique reports.

Default: 3 knobs is the sweet spot. Five is too busy, one is not worth a panel.

Step 3 — Lift hard-coded values into custom properties

Open

assets/wrap.html

<style>

block — copy its custom-property naming scheme (

--accent

--scale

, etc.). In the user's artifact, find every place those concerns live and rewrite:

```
color: #c96442
```
→
```
color: var(--accent)
```

font-size: 18px

→

font-size: calc(18px * var(--scale))

padding: 24px 32px

→

padding: calc(24px * var(--density)) calc(32px * var(--density))

transition: opacity 200ms

→

transition: opacity calc(200ms * var(--motion-mult))

If the artifact uses

clamp()

vw

already, multiply the outer value by the custom property — don't tear apart

clamp(...)

Step 4 — Paste into the wrap

Copy the artifact's

<style>

and

<body>

into the marked regions of

wrap.html

. Keep the panel + bridge intact.

Step 5 — Test the loop

Open the result, click each knob at least once, refresh the page, confirm the choice persists. If a knob breaks the layout — remove it, don't ship it.

Output contract

<artifact identifier="tweaks-<artifact-slug>" type="text/html" title="<Artifact Title> · Tweaks">
<!doctype html>
<html>...</html>
</artifact>

One sentence before the artifact ("Wrapped X with a 3-knob tweak panel — accent / scale / mode."). Stop after

</artifact>

Hard rules

Don't ship a free color picker — only curated swatches. Users pick bad colors when given freedom; saving them from that is the whole point.
Persist by artifact identifier —
```
tweaks-<slug>
```
, not a global key. Two artifacts open in two tabs must not share state.
Respect
prefers-reduced-motion
— default to Off for motion if the user has that set, override only on explicit click.
Single-file — no external CSS / JS / fonts beyond the artifact's existing imports. Inline the panel + bridge.
Panel hidden by default on viewports < 720px — slide-in drawer via a "T" button at top-right.
Don't ship more than 5 knobs. Three is the sweet spot.

tweaks

NPX Install

Tags

SKILL.md Content

Tweaks Skill · 参数化变体面板

What you produce

When to use

When not to use

The 5 standard knobs

1.
`--accent`
— Accent color

2.
`--scale`
— Type scale (0.85 / 1.0 / 1.15)

3.
`--density`
— Layout density (Tight / Normal / Roomy)

4.
`--mode`
— Light / Dark

5.
`--motion`
— Off / Subtle / Lively

Implementation primitives

Workflow

Step 1 — Acquire the artifact

Step 2 — Decide which knobs apply

Step 3 — Lift hard-coded values into custom properties

Step 4 — Paste into the wrap

Step 5 — Test the loop

Output contract

Hard rules

tweaks

NPX Install

Tags

SKILL.md Content

Tweaks Skill · 参数化变体面板

What you produce

When to use

When not to use

The 5 standard knobs

1. --accent — Accent color

2. --scale — Type scale (0.85 / 1.0 / 1.15)

3. --density — Layout density (Tight / Normal / Roomy)

4. --mode — Light / Dark

5. --motion — Off / Subtle / Lively

Implementation primitives

Workflow

Step 1 — Acquire the artifact

Step 2 — Decide which knobs apply

Step 3 — Lift hard-coded values into custom properties

Step 4 — Paste into the wrap

Step 5 — Test the loop

Output contract

Hard rules

1.
`--accent`
— Accent color

2.
`--scale`
— Type scale (0.85 / 1.0 / 1.15)

3.
`--density`
— Layout density (Tight / Normal / Roomy)

4.
`--mode`
— Light / Dark

5.
`--motion`
— Off / Subtle / Lively