The trademark is drawn flush to Archivo’s cap line already: its yMax is 687 against a cap height of 686, at every position on both axes. Scale it by r and the top drops to 686r, so the rise that puts it back on the cap line is fixed by the ratio alone.rise = 0.686em × (1 − r) ÷ rMeasured in the trademark’s own em, which is what vertical-align resolves against. At r = 0.38 that is 1.119em, and it never needs a second value for a second size.
The glyph’s own left sidebearing does part of the spacing work. At wdth 62 the trademark carries 23 units of left bearing and 50 of right, so the visible gap after the H is already 0.009em before any margin is added, and the lockup’s right edge sits 0.019em inside its advance. Both are corrected in the spec so the mark centres on what the eye sees.
Mark the span aria-hidden. The nav link already carries an aria-label, so leaving the glyph exposed makes a screen reader announce "trade mark" on every page.