Mono

Mono is a design system built on a single constraint: one monospaced typeface does everything — headings, body, labels, numbers, and code. That restriction creates a calm, system-like coherence where every glyph occupies the same cell and the whole interface reads like a beautifully formatted document. It feels honest, technical, and quietly playful, the way a well-kept terminal or a clean printout feels. Reach for it on developer tools, documentation, changelogs, and personal sites that want craft and character without decoration.

Design principles

• One family, no exceptions: the entire UI is monospaced, so hierarchy comes from weight, case, and spacing alone.
• Embrace the grid the typeface gives you — align everything to the character cell and let columns snap to fixed widths.
• Decoration is borrowed from text: brackets, hyphens, hashes, and slashes do the work of icons and rules.
• Keep color almost absent; near-black ink, paper background, one accent link color.
• Left-align and let lines break naturally; centered text fights the typewriter logic.
• Whitespace is generous and rhythmic, measured in line-heights rather than arbitrary pixels.

Color

The canvas is a warm paper #FAFAF7 that reads softer than pure white and pairs naturally with the typewriter feel, while raised surfaces and cards step up to a clean #FFFFFF. Ink is a near-black #1A1A1A rather than full black, which eases contrast strain across dense monospace text.

Secondary metadata, timestamps, and label brackets use a warm gray #8A8780. The single chromatic note is a confident #0066FF, reserved exclusively for links and the rare primary action so its appearance always carries meaning. Borders and inline-code fills use a quiet #E6E4DD.

Token reference:

• Page background: #FAFAF7
• Card / surface: #FFFFFF
• Ink / body: #1A1A1A
• Link / accent: #0066FF
• Muted / metadata: #8A8780
• Border / code fill: #E6E4DD

A dark variant flips to a #16161A background, #ECEAE3 ink, #2A2A30 borders, and a brightened #5C9CFF accent for legibility on the dark field.