Viewport and RWD Concepts
Responsive Web Design (RWD) is not a single technique — it's a philosophy and a set of interconnected CSS strategies that make websites adapt to any screen size, resolution, and device capability.
Media Queries Deep Dive
Media queries are CSS conditional blocks — they apply styles only when specific conditions about the device, viewport, or user preference are met. They are the primary tool for responsive design.
Responsive Images and Content
Images are often the biggest bandwidth consumers on a page. Responsive image techniques ensure users get the right image at the right size — improving performance, Core Web Vitals, and user experience.
Container Queries
Container queries are the biggest shift in responsive CSS since media queries. Instead of responding to the viewport width, they respond to the size of a parent element — making truly reusable, context-aware components possible.
Dark Mode System
Dark mode is no longer optional in premium web design — it's expected. This guide covers every approach from simple prefers-color-scheme to full manual toggle with persistence, and shows how to implement a complete dark mode system in WordPress.