CSS Layers (@layer)

CSS Layers (@layer) — Manage CSS cascade and specificity with @layer: organize styles, control priority, and build scalable architecture. The guide walks through The Cascade Problem, Introducing @layer, Layer Ordering and Nesting, Layer Best Practices. As CSS projects grow, specificity conflicts become harder to manage. CSS Layers solve this by letting you explicitly control the order in which style groups are applied. The cascade order (highest to lowest priority): 1. Transition declarations 2. !important browser defaults 3. !important user styles 4. !important author styles 5. Animation declarations 6. Normal author styles 7. Normal user styles… The @layer at-rule lets you define explicit layers with controlled priority: Declaring layers: @layer reset, base, components, utilities, overrides; /* Later layers have higher priority */ Defining layer rules: @layer reset { *, *::before, *::after { box-sizing: border-box; margin: 0; } body { line-height: 1; } } @layer base { body { font-family: system-ui; line-height: 1.6; color: #333; } h1…