css-grid-math
Derive and debug CSS Grid layout math for grid coordinates, line placement, spans, negative indexes, fr units, minmax(), fit-content(), repeat(), auto-fill, and auto-fit. Use when building grid systems, explaining track sizing, troubleshooting fr distribution, placing items by line numbers, or converting a layout sketch into CSS Grid formulas.
Works with
--- name: css-grid-math description: Derive and debug CSS Grid layout math for grid coordinates, line placement, spans, negative indexes, fr units, minmax(), fit-content(), repeat(), auto-fill, and auto-fit. Use when building grid systems, explaining track sizing, troubleshooting fr distribution, placing items by line numbers, or converting a layout sketch into CSS Grid formulas. license: MIT --- # CSS Grid Math Use this skill when a grid needs to be reasoned about as a coordinate and sizing system. It helps calculate where items land, how tracks divide space, and why flexible tracks do not always produce expected widths. ## Quick Start 1. Read `guidelines.md` to select the smallest relevant file set. 2. Load `references/grid-layout/rules.md` for implementation decisions. 3. Load `references/grid-layout/examples.md` when editing code. 4. Use `workflows/debug-grid-layout.md` for multi-step derivation or debugging. ## Contents | Resource | Purpose | |----------|---------| | `guidelines.md` | Routes tasks to the right reference files | | `references/source-map.md` | Book source and chapter/section traceability | | `references/grid-layout/knowledge.md` | Core concepts and terminology | | `references/grid-layout/rules.md` | Practical rules, guidelines, and exceptions | | `references/grid-layout/examples.md` | Bad/good examples and refactoring approach | | `references/grid-layout/patterns.md` | Reusable formula and implementation patterns | | `references/grid-layout/checklist.md` | Review checklist and red flags | | `workflows/debug-grid-layout.md` | Step-by-step workflow | ## Source Derived from *Math for Web Design* by Paul McFedries, Chapter 4: CSS Grid math. Citations are tracked in `references/source-map.md`.
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