Typography is half of the interface: it sets hierarchy, tone, and readability. The goal is to be expressive without losing accessibility. Here is a practical approach.

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1. Use variable fonts wisely

• Fewer files, more control: one variable font gives you weights/axes without multiple downloads. Limit the axes you serve (e.g., weight 400–700).
• Simple loading: with Next, import via next/font and restrict subsets and weights you really need.
• Skip gratuitous axes: avoid decorative extremes if they hurt legibility.

:root {
  --font-body: "InterVariable", system-ui, -apple-system, sans-serif;
  --font-title: "GeneralSansVariable", system-ui, sans-serif;
}

2. Fluid sizes with clamp()

• Let headings grow on desktop while staying readable on mobile.
• Quick rule: clamp(min-size, factor * vw + offset, max-size).

h1 {
  font-size: clamp(2rem, 3vw + 1rem, 3.5rem);
  line-height: 1.1;
}

body {
  font-size: clamp(1rem, 1vw + 0.75rem, 1.1rem);
  line-height: 1.55;
}

3. Rhythm and legibility first

• Line-height: 1.4–1.6 for body; 1.1–1.3 for headings.
• Column width: 60–80 characters reduces fatigue. Use max-width: 65ch.
• Spacing: consistent margin-block on lists and paragraphs; uppercase text with letter-spacing: 0.02em.

.prose {
  max-width: 65ch;
  letter-spacing: 0.01em;
}

.prose p + p {
  margin-top: 0.85em;
}

4. Contrast and friendly backgrounds

• Check contrast (AA minimum: 4.5:1 on body text).
• Avoid text over noisy photos; add overlays or solid cards.
• Use color tokens and test both themes if you have dark mode.

5. Careful animations

• If you animate text, respect prefers-reduced-motion.
• Use short transitions (120–180ms) on color/background for hover/focus states.

@media (prefers-reduced-motion: reduce) {
  * {
    animation: none !important;
    transition: none !important;
  }
}

6. Reusable type system

Define a scale and tokens and apply them in components, not inline.

:root {
  --fs-xs: 0.85rem;
  --fs-sm: 0.95rem;
  --fs-md: 1rem;
  --fs-lg: 1.25rem;
  --fs-xl: 1.6rem;
  --fs-2xl: 2.4rem;
}

.heading-1 { font: 700 var(--fs-2xl) / 1.1 var(--font-title); }
.heading-2 { font: 700 var(--fs-xl) / 1.2 var(--font-title); }
.text-body { font: 400 var(--fs-md) / 1.55 var(--font-body); }
.text-small { font: 500 var(--fs-sm) / 1.45 var(--font-body); }

7. Quick checklist

1. Variable fonts with limited weights.
2. Headings and body with clamp().
3. Columns at ~65ch; tuned line-height.
4. AA contrast in both themes.
5. Opt-out animations with prefers-reduced-motion.
6. Typographic tokens used consistently across components.

Conclusion

Typography sets your UI's personality: you can be expressive without losing clarity if you start from an accessible base (contrast, rhythm, fluid sizes) and leverage modern tools like variable fonts and clamp(). Begin with a scale and tokens, test on mobile and desktop, and iterate from there.