Making Software. Blueprint ink on a reading-room page.

The pixel wordmark, diagram callout labels, the progress bar and the active WORDS toggle — one cobalt reads as printed blueprint ink, not a UI accent

Line strokes, arrows, dashed guides and solid fills inside the technical illustrations — the working ink of every drawing

Mid-tone shading on illustrated parts such as the magnetic disk and keyswitch boot — the shadow side of the cobalt

Secondary part shading and hatched cut faces inside diagrams, one step lighter than Periwinkle Fill

The palest blue tint on drawn surfaces, used for lit planes of isometric objects and soft light cones

All prose, the Table of Contents rule, chapter heads, button labels and the typewriter footer lines

Black at 50% for figure numbers, word counts, IN/OUT labels and the button outline — the quiet metadata layer

Black at 10% for the FAQ card border and the rule between its rows; the only container edge on the page

Cool off-white fill for the body of drawn objects, a half-step cooler than the page so parts read as paper cutouts

The single page canvas behind every section, the masthead and the FAQ card; there are no tinted bands

Brightest faces of illustrated objects such as disk platters and dust liners, and the bevel highlight on the key button