@media print {
  @page { size:A4 portrait; margin:12mm; }
  body { background:#fff !important; }
  .page-shell { width:100%; padding:0; }
  .prototype-banner,.hero-actions,#settingsSection,#shapeLibrarySection,#entrySection,#shapeListSection,.preview-card,#coordinateTableSection,.diagram-tabs,.diagram-toolbar,.diagram-help,.measurement-summary,#exportSection,.toast { display:none !important; }
  .hero,.card { box-shadow:none !important; break-inside:avoid; }
  .hero { padding:10px 0; border:0; }
  .hero h1 { font-size:25px; }
  .workspace { display:none; }
  .diagram-stage { height:150mm; min-height:0; border:1px solid #bbb; }
  #diagramSvg { width:100%; height:100%; }
  #calculationDetails { display:block; }
  #calculationDetails>summary { display:none; }
  #calculationDetails .details-body { display:block !important; }
  .calculation-table-wrap { overflow:visible; }
  .calculation-table { min-width:0; font-size:10px; }
}