Interface Lab
Knowledge RAG

Design Knowledge Base

Community-maintained principles reviewed before publication and retrieved as Agent design constraints.

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6 published principles / 192 in library
Visual Foundationstypography / navigation

Typographic Index Brand System

When a site uses large type, indexes, menus, and project lists as brand expression, typography must carry navigation, hierarchy, and information scent rather than acting only as a poster effect.

Expressive typography should turn brand voice into actionable structure: users should understand where they are, where to go next, and which items matter through type scale, placement, indexes, and states.93%
Typography Color Accessibilitytypography / spacing

Text Spacing Resilience

Text Spacing Resilience turns a frequent interface judgment into an executable constraint before generation.

Interfaces should tolerate adjusted line height, letter spacing, font size, or browser zoom without hiding content.84%
Typography Color Accessibilitytypography / font-pairing

Font Pairing by Function

Font pairing should start from product function: brand voice, long reading, numeric comparison, and controls have different needs.

Typeface differences need a clear purpose; decorative mixing can increase reading cost.82%
Typography Color Accessibilitytypography / font-weight

Font Weight Emphasis

Font weight creates emphasis; it should not make every label bold.

Too much bold text loses emphasis and makes dense interfaces feel heavy.82%
Typography Color Accessibilitytypography / readability

Line Height and Measure

Long text needs comfortable line height and measure; dense interfaces still need readable text.

Overwide lines lose place, tight line height feels cramped, and loose line height reduces useful density.82%
Typography Color Accessibilitytypography / hierarchy

Type Scale Hierarchy

Type scale should serve page structure and avoid hero-sized text in compact panels.

A clear type scale lets headings, labels, body text, and numbers each do their job.82%