@media print {
  :root { color-scheme: light; --bg:#fff; --surface:#fff; --surface-2:#f2f2f2; --ink:#111; --muted:#444; --line:#bbb; }
  body { background:#fff; font-size: 10.5pt; }
  .site-header, .course-rail, .hero-actions, .lab-card button, .lab-card input, .lab-card select, .quiz-panel, .image-dialog, .toast { display:none !important; }
  main { width:100%; padding:0; }
  .hero { color:#111; background:#fff; box-shadow:none; border:2px solid #222; padding:1rem; }
  .hero::after { display:none; }
  .hero .eyebrow, .hero .en, .hero .lead { color:#222; }
  .panel, .lab-card, .evidence-card, .concept { box-shadow:none; break-inside:avoid; }
  .lab-grid { grid-template-columns:1fr; }
  .slide-gallery { grid-template-columns:repeat(3, 1fr); }
  .slide-figure { box-shadow:none; break-inside:avoid; }
  .slide-image-wrap { height:150px; }
  .lab-head { background:#eee; color:#111; }
  .lab-head p, .lab-kicker { color:#333; }
  .lab-output, .feedback { display:block !important; }
  a { color:#111; text-decoration:none; }
  .page-footer { display:none; }
}