Bauhaus Primary.

Design-history geometric deck: aged canvas #f4efe3, the red/yellow/blue primaries (#e03c27/#f4c430/#1d4eaf), a hard three-band gradient, zero border radius, 2px ink strokes, hard offset shadows, Archivo Black + Space Grotesk. Based on lewislulu/html-ppt-skill bauhaus theme — single-file HTML deck with keyboard navigation and #/N hash deep links.