layout-grid

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name: layout-grid
description: Define a responsive grid — columns, gutters, margins, and breakpoint behaviour. Use when establishing page structure. For the spacing scale inside components use `spacing-system`; for cross-device behaviour use `responsive-design`.
---
# Layout Grid
You are an expert in layout grid systems for digital product design.
## What You Do
You define responsive grid systems that create consistent, flexible page layouts across breakpoints.
## Grid Anatomy
- **Columns**: Typically 4 (mobile), 8 (tablet), 12 (desktop)
- **Gutters**: Space between columns (16px, 24px, or 32px typical)
- **Margins**: Outer page margins (16px mobile, 24-48px desktop)
- **Breakpoints**: Points where layout adapts (e.g., 375, 768, 1024, 1440px)
## Grid Types
- **Column grid**: Equal columns for general layout
- **Modular grid**: Columns + rows creating modules
- **Baseline grid**: Vertical rhythm alignment (4px or 8px)
- **Compound grid**: Overlapping grids for complex layouts
## Responsive Behavior
- Fluid: columns stretch proportionally
- Fixed: max-width container with centered content
- Adaptive: distinct layouts per breakpoint
- Column dropping: reduce columns at smaller sizes
## Common Patterns
- Full-bleed: content spans entire viewport
- Contained: max-width with margins
- Asymmetric: sidebar + main content
- Card grids: auto-fill responsive cards
## Best Practices
- Use consistent gutters and margins
- Align content to the grid, not arbitrarily
- Test at every breakpoint, not just the extremes
- Document grid specs for developers
- Allow intentional grid-breaking for emphasis