Understanding the rules before bending them. CSS is often treated as unpredictable. Styles override each other. Layout shifts unexpectedly. Developers respond by increasing specificity, rearranging rules, or layering fixes on top of fixes. The problem is rarely CSS itself. The problem is mental models. The CSS Codex is a structured 4 week, 12 part series designed to build a clear, scalable understanding of how CSS actually works. Each article builds on the previous one. Every concept connects forward and backward. By the end, the Codex forms a cohesive system rather than a collection of isolated tips. This is not about tricks.It is about rules.It is about discipline.It is about building…