For years, responsive typography meant adding media query breakpoints to change heading sizes. CSS clamp() changed everything.
Understanding clamp()
clamp(min, preferred, max) sets a value that scales with the viewport between a minimum and maximum. For type: font-size: clamp(1.5rem, 4vw, 3rem) gives you a heading that starts at 24px on small screens and grows to 48px on large ones.
Building a Fluid Type Scale
The power comes from building an entire type system this way. Define each heading level and body size with clamp(). The result is a type scale that feels appropriate at every viewport width.