TYPEMATCHSEO
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V2.1

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700
400
PAIRING ID: CAI-IBM // ETHOS: SANS-SERIF + MONOSPACE

Balancing Cairo with IBM Plex Mono

Build a contrast-first system where Cairo leads and IBM Plex Mono keeps long-form content legible.

Display Face

Cairo

Weight: 700

Body Face

IBM Plex Mono

Weight: 400

This pairing is engineered for teams that need a clear hierarchy without sacrificing brand voice. Cairo brings arabic, modern, titling energy to hero units, pricing sections, and campaign headlines. IBM Plex Mono absorbs the heavy lifting for paragraphs, product storytelling, and UI labels with its technical, corporate, engineered texture and dependable rhythm. Together they create a typography stack that scales from high-impact landing pages to dense documentation without retooling your CSS tokens.

Typographic Hierarchy & Scale

H1The Quick Fox
H2The Quick Fox
H3The Quick Fox
PThe quick brown fox jumps over...
Dark Context
Aa

High contrast negative space.

Accent
Gg

Legibility on high-chroma.

Pairing Strategy

Balancing Cairo with IBM Plex Mono

Build a contrast-first system where Cairo leads and IBM Plex Mono keeps long-form content legible.

This pairing is engineered for teams that need a clear hierarchy without sacrificing brand voice. Cairo brings arabic, modern, titling energy to hero units, pricing sections, and campaign headlines. IBM Plex Mono absorbs the heavy lifting for paragraphs, product storytelling, and UI labels with its technical, corporate, engineered texture and dependable rhythm. Together they create a typography stack that scales from high-impact landing pages to dense documentation without retooling your CSS tokens.

Cairo thrives as a headline face thanks to its arabic, modern, titling qualities. Use weights 700–900 for crisp editorial lockups.
IBM Plex Mono excels in paragraphs and UI thanks to its technical, corporate, engineered traits. Keep it between weights 400–600 for optimal readability.
Hierarchy guidance: run a 1:1.4 modular scale and reserve Cairo for H1–H3 while IBM Plex Mono powers captions, body copy, and data tables.

Best-Fit Use Cases

  • High-growth SaaS landing pages that require arabic hero statements with trustworthy product copy.
  • Editorial magazines and thought-leadership hubs where Cairo can dramatize pull quotes while IBM Plex Mono keeps 1,500-word essays skimmable.
  • Conversion funnels or onboarding flows that need IBM Plex Mono's technical voice to balance Cairo's attention-grabbing display.

Accessibility Notes

Maintain a minimum 4.5:1 contrast ratio for IBM Plex Mono body copy and loosen letter-spacing to 0.01em for uppercase Cairo moments. Pairing different categories demands disciplined color pairing—test both light and dark themes to ensure IBM Plex Mono does not bloom at small sizes.

CSS Implementation Cheatsheet

:root {
  --tm-header-family: 'Cairo', sans-serif;
  --tm-body-family: 'IBM Plex Mono', monospace;
  --tm-header-weight: 700;
  --tm-body-weight: 400;
  --tm-header-tracking: -0.01em;
  --tm-body-tracking: 0em;
}
Heading scale: clamp(2.75rem, 4.5vw, 5.25rem) for H1, clamp(1.5rem, 2.8vw, 3rem) for H2, and keep paragraph size at 1rem–1.125rem with 1.6 line-height.
Component guidance: Buttons inherit Cairo at 700 for momentum, while forms, tables, and footnotes stay on IBM Plex Mono with 400 weight for predictable kerning.

FAQs

Why does Cairo make sense as the lead font?

Cairo owns the emotional register of this system. Its arabic, modern, titling profile helps anchor campaign creative, meaning marketing and product teams can reuse the same voice without reinventing the scale.

Where should IBM Plex Mono show up?

IBM Plex Mono is the workhorse. Keep it in paragraphs, long-form editorial, knowledge bases, or anywhere legibility is non-negotiable. Its technical, corporate, engineered qualities reduce fatigue on dense layouts.

Does this pairing support complex localization?

Yes—both families are available on Google Fonts with generous glyph coverage. Test cyrillic/latin accents early, but most Latin-based locales and UI patterns are fully supported.