responsive-ui

Mobile-first responsive design starts with CSS written for the smallest viewport, then uses media queries and breakpoints to layer complexity for larger screens. This Skill provides mobile-first CSS patterns, CSS Grid and Flexbox layouts, and fluid typography that scale across device sizes from 280px to 2560px+, ensuring no horizontal scroll and graceful adaptation.

Responsive images use srcset and lazy loading to serve appropriately sized images based on device resolution and viewport. This Skill includes responsive image patterns with srcset, lazy loading techniques, and semantic HTML5 markup to optimize performance and reduce bandwidth while maintaining visual quality across all devices.

Accessible mobile navigation combines semantic HTML5, ARIA attributes, keyboard support, and focus management with responsive patterns like hamburger menus. This Skill covers accessible navigation design, keyboard interactions, and focus states that function across all screen sizes while meeting accessibility standards.

Yes, CSS Grid and Flexbox serve complementary layout purposes: Grid excels at two-dimensional page layouts, while Flexbox handles one-dimensional component flows. This Skill provides patterns for combining both layout systems with mobile-first CSS and content-driven breakpoints to build flexible, responsive interfaces.

Fluid typography scales smoothly across viewport sizes using CSS functions, eliminating jarring size jumps at breakpoints. This Skill implements fluid typography alongside design tokens to maintain readability and visual hierarchy from small phones to ultra-wide desktops without multiple breakpoint-specific font sizes.

A design-token-driven architecture streamlines responsive design by centralizing spacing, typography, and color rules. This Skill uses design tokens from provided references to enable consistent, scalable responsive layouts that adapt systematically across devices while reducing CSS duplication.