/* US Letter page geometry. Paired with css/page-a4.css: js/paper.js enables
   exactly one of them by flipping each link's `media` between "print" and
   "not all". This lives in a real stylesheet rather than a <style> element
   built at runtime so that Content-Security-Policy can keep style-src at
   'self' with no 'unsafe-inline'. Letter is the pre-JS default, matching
   the paper control's own default. (2026-09-07) */
@page { size: letter; margin: 0.5in; }