I believe CSS is changing in ways you don’t expect. From the introduction of several math functions like sin(), cos(), calc(), random(), and many more, it is getting accepted as a programming language rather than a style sheet language. One of its other interesting syntax I came to understand was the counter() function and counter-increment property which basically helps you count sections or lists in your HTML and they are mostly used within pseudo-elements but can be used where the <string> value is supported in CSS.
MDN has a sweet one on the counter() function and counter-increment property, so do check them out: