@page { size: letter; margin: .55in; }
/* Long lessons may flow; their headings and individual experiments stay together. */
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.source-reference { font-size: 8pt; }
.appendix-section, .quick-reference-section { break-inside: avoid; }
html, body { color: #172c52; background: #fffdf7 !important; font-size: 10.5pt; line-height: 1.38; }
body { background-image: none !important; }
.screen-only, nav, .skip-link, #live-region, .mission-log, .copy-button, .hint-button, .challenge button, .academy-header, footer { display: none !important; }
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