css-design-tokens-and-theming

To replace hardcoded CSS values with semantic design tokens, you inventory existing stylesheets and generate role-based custom properties like --bg-primary. This establishes a centralized system derived from brand authority, eliminating theme drift.

Supporting dark mode and high-contrast themes requires scheme-aware overrides using semantic CSS custom properties. This approach enables seamless switching between visual modes without modifying component-level CSS, maintaining theme consistency across web surfaces.

UI design suffers from theme drift and inconsistent styling when hardcoded hex colors bypass brand authority. Implementing a centralized, rationale-backed system of design tokens standardizes styling and ensures future edits remain reviewable.

To document the design intent behind CSS custom properties, you maintain a per-token audit table. This auditable rationale records the design intent for every color choice, ensuring future edits align with brand authority.

A strict no-hardcoded-value policy is required for UI theming to prevent theme drift. Enforcing this policy ensures all styling changes route through centralized token management, maintaining semantic consistency and auditable rationale across web surfaces.