A two-input estimator built as a real paper nomogram: three vertical ASCII scales in Geist Mono where a straightedge stretched between draggable left and right handles crosses the middle scale at the exact computed answer, log-spaced so the crossing is mathematically exact rather than decorative. Scaled and paced as a pricing-page hero: a thick line springs into place on mount and the crossing idles through a few illustrative readings on its own before anyone touches it.