# Notice

Several passages in this skill's references condense ideas from open-source projects, rewritten in our own words rather than copied. Credit and licenses:

- **Craft rules** (typography numbers, color budget, checkable generic tells, hierarchy vectors, state coverage, animation limits): condensed from the `craft/` guides of **Open Design** (https://github.com/nexu-io/open-design, Apache License 2.0, Copyright 2026 Open Design contributors), which in turn adapt **refero_skill** by Refero Design (https://github.com/referodesign/refero_skill, MIT) and **taste-skill** by Leonxlnx (https://github.com/Leonxlnx/taste-skill, MIT, Copyright (c) 2026 Leonxlnx).
- **Reference contract and brand extraction** (keep / change / do-not-copy, the sufficiency test, measuring a kit from a live site): condensed from Open Design's reference-contract and brand-extract skills (Apache License 2.0).
- **Motion pacing, scene shape, transitions as exits, video-frame scale and seekable-runtime hazards**: condensed from the official **HyperFrames** skills by HeyGen (https://github.com/heygen-com/hyperframes, Apache License 2.0).
- **Motion verification ideas** (frame-difference checks, transition contact sheets, seam checks between chained clips): inspired by **huashu-art-motion** (https://github.com/alchaincyf/huashu-art-motion, MIT, Copyright (c) 2026 alchaincyf) and **oil-motion** (https://github.com/oil-oil/oil-motion, MIT, Copyright (c) 2026 Lin Zhihuang).
- **Animation frequency and UI duration guidance**: inspired by Emil Kowalski's animation skills (https://github.com/emilkowalski/skills, MIT, Copyright (c) 2026 Emil Kowalski).

The Apache License 2.0 text is at https://www.apache.org/licenses/LICENSE-2.0. The MIT License terms that apply to the MIT-licensed sources above follow. Other material comes from official documentation (WCAG, MDN and others, cited where used) and original work.

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MIT License

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