Tweaks

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:

1. Stage — the original artifact (landing page / deck / dashboard) re-keyed so all visual decisions read from CSS custom properties: --accent, --scale, --density, --mode, --motion.
2. 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.

1. --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.

2. --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).

3. --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.

4. --mode — Light / Dark

A 2-state toggle. Sets data-mode="light" vs "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.

5. --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:

1. Take the user's existing artifact HTML.
2. Lift its accent / mode / spacing / scale into custom properties (search for hard-coded #hex / Npx / Nrem and convert).
3. Paste the contents into the marked region of wrap.html.
4. 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.
5. 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).