typography-system

A modular type scale establishes a mathematical ratio between font sizes, ensuring consistency across components. Define a base font size and modular scale (such as 1.5x), then generate heading, body, and display sizes by multiplying the base. This creates a scalable typography system that maintains visual hierarchy across web and mobile products.

Accessible typography requires sufficient color contrast ratios, adequate line height for readability, and responsive font sizing that adapts to device width. Ensure body text meets WCAG standards, use semantic HTML heading levels, and test readability across screen sizes and user zoom preferences for inclusive design.

Font pairing combines complementary typefaces—typically a serif with sans-serif or two sans-serifs with distinct personalities. Reduce performance impact by limiting font weights and subsets, using system fonts as fallbacks, and loading fonts asynchronously or with font-display properties to prevent layout shift.

Yes. Responsive typography scales font sizes fluidly between breakpoints using CSS calculations or media queries. A modular scale works across devices by maintaining proportional relationships; adjust base size for mobile and scale up proportionally on larger screens while preserving readability.

Create CSS custom properties or design tokens for each scale step—body-xs, body-sm, heading-lg, display-xl—mapping to calculated sizes. Document each token's use case, line height, letter spacing, and weight, then provide code snippets showing application to common components like cards and buttons.

Inconsistent font sizes, weights, and spacing increase cognitive load as users recalibrate visual hierarchy on each page. A unified modular system reduces decision fatigue, improves scannability, and ensures predictable readability across all UI surfaces and contexts.