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@media print{#notebook-reader,.notebooks,.hero-notes-link{display:none!important}}
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.brand-logo{width:60px;height:34px}.brand-logo img{width:72px;height:72px;left:-4px;top:-18px}
@media(max-width:800px){.brand-logo{width:52px;height:32px}.brand-logo img{width:62px;height:62px;left:-4px;top:-15px}}
@media(max-width:360px){.brand-logo{width:43px}.brand-logo img{width:52px;height:52px;left:-3px;top:-11px}}
/* Revision 4: fewer sections, complete lesson sequences, consistent paper. */
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@media(prefers-reduced-motion:reduce){html{scroll-behavior:auto}}
html.js .tabs{display:flex;flex-wrap:nowrap}.tabs button{flex:1;min-width:0}.contact-hint br{display:block}.contact-hint{text-align:left}.hero-proof .proof-source{flex-direction:row}.proof-source .proof-caption{text-decoration:none}.review-track .review{flex-basis:calc((100% - 22px)/2);min-height:330px}.review-track .review blockquote{font-size:16px;line-height:1.75}.review-track .review figcaption{flex-direction:row;margin-top:auto}.review-track{overflow-y:hidden;scrollbar-gutter:stable}.hero-manuscript .note-open img{background:var(--paper)}
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.header{background:#fff}