/* Compact reading surfaces; motion never takes over native scrolling. */
:root{--blue:#1248d8;--paper:#fff}.sheet-explanations{display:none}.hero-proof>div>strong,.hero-proof .proof-source>strong{font-size:52px;letter-spacing:-.055em}.hero-proof strong>span{font-size:.62em}.hero-proof .proof-caption,.hero-proof>div>span{font-size:14px}.hero-note{--paper:#f8f7e9}.hero-note .note-content{background:var(--paper)}.hero-note .hero-manuscript img{background:var(--paper)}.hero-service{max-width:670px}.contact-hint{font-size:14px;max-width:330px}.section-heading h2{letter-spacing:-.05em}.subject p,.cross-subject{font-size:16px}.topics summary{font-size:14px}.lesson-intro p{font-size:16px}.lesson-commentary{font-size:16px;line-height:1.75}.lesson-commentary .eyebrow{font-size:12px}.lesson-commentary h4{font-size:29px;line-height:1.2}.lesson-paper{position:sticky;top:100px;border-color:var(--paper);box-shadow:0 14px 40px #15254e0b}.lesson-paper img{height:610px;padding:12px}.lesson-paper figcaption{font-size:12px;border:0}.lesson-navigation{border-top:1px solid #cdd4df;padding-top:18px}.lesson-thumbnails button{border-radius:8px}.lesson-frame{gap:48px;animation:page-in .3s ease-out}.lesson-pager.bottom{margin-top:24px}.after-lesson{display:grid;grid-template-columns:1fr 1fr;gap:32px;padding:32px;margin:30px 0;background:#e9eefb;border-radius:16px;align-items:center}.after-copy h4{font-size:29px;line-height:1.2;letter-spacing:-.035em;margin:15px 0}.after-copy>p{font-size:16px}.after-copy .eyebrow{font-size:12px}.after-copy .button{font-size:14px;min-height:48px;margin-top:18px}.after-copy .after-note{font-size:12px;margin-top:12px}.sheet-pair{display:grid;grid-template-columns:1fr 1fr;gap:12px;align-items:center}.sheet-pair a{display:block;color:#294269;text-decoration:none;font-size:12px}.sheet-pair img{display:block;width:100%;height:auto;background:white;border:1px solid #dee5f3;box-shadow:0 5px 14px #13307912;transition:transform .25s}.sheet-pair a:hover img{transform:translateY(-5px)}.sheet-pair span{display:block;margin-top:10px}.method-compact>summary{font-size:16px}.method-compact>div{font-size:16px}.review blockquote{font-size:16px}.about-story{display:grid;grid-template-columns:1fr 1.1fr;gap:40px 80px;align-items:start}.about-heading{position:sticky;top:110px}.about-heading h2{font-size:clamp(35px,4vw,54px);line-height:1.08;letter-spacing:-.055em;margin:20px 0}.about-heading>p:not(.eyebrow){font-size:17px;max-width:440px}.about-card{padding:0 0 42px;margin:0 0 40px;border-bottom:1px solid #cbd6ec}.about-card:last-child{margin-bottom:0}.story-number{display:block;font-size:clamp(68px,8vw,110px);line-height:1.05;letter-spacing:-.07em;font-weight:800;color:var(--blue);margin-bottom:22px;will-change:transform}.story-word{font-size:clamp(56px,6.5vw,80px)}.about-card h3{font-size:26px;line-height:1.2;letter-spacing:-.03em}.about-card p{font-size:16px;line-height:1.75}.about-links{display:flex;gap:14px;flex-wrap:wrap;margin-top:20px;font-size:14px;font-weight:700}.story-controls{display:none}.compact-faq{grid-column:1/-1}.compact-faq summary,.compact-faq p{font-size:16px}.cta-reassurance{font-size:16px!important;opacity:.92}.final-actions .button{min-height:60px;font-size:18px;padding-inline:24px}.doc-toolbar>span{font-size:13px;color:#526077}.doc-source{justify-content:center}.doc-explanation .lesson-commentary{font-size:17px}.doc-explanation h3{font-size:29px}.doc-reader-open .header{visibility:hidden}.hero-proof>div{transition:transform .1s linear}.section-heading{transition:transform .25s ease-out}.motion-active .reveal{transition:opacity .45s ease,transform .45s ease}.motion-active .reveal:not(.in-view){opacity:.72;transform:translateY(18px)}.motion-active .reveal.in-view{opacity:1;transform:translateY(0)}
@keyframes page-in{from{opacity:.65;transform:translateY(8px)}to{opacity:1;transform:translateY(0)}}
@media(min-width:1000px){#materie{display:grid;grid-template-columns:1fr 1.8fr;gap:0 65px;align-items:start}#materie>.section-heading{position:sticky;top:110px;grid-row:1/4}#materie .subjects{grid-template-columns:1fr 1fr}.hero-proof{padding-block:26px}.examples .section-heading{display:grid;grid-template-columns:1fr 1fr;gap:10px 45px}.examples .section-heading .eyebrow{grid-column:1/-1}.examples .section-heading>p:last-child{align-self:center}}
@media(max-width:1000px){.after-lesson{gap:24px;padding:24px}.about-story{gap:35px}.lesson-frame{gap:28px}.lesson-paper img{height:530px}}
@media(max-width:700px){.section{padding-block:44px}.hero-proof>div>strong,.hero-proof .proof-source>strong{font-size:38px}.hero-proof .proof-caption,.hero-proof>div>span{font-size:12px}.hero-proof .proof-source>strong>span,.hero-proof>div:nth-child(2)>strong>span{font-size:.65em}.hero-proof>div>strong>span{font-size:15px}.hero-proof>div{padding-inline:8px}.hero-email{font-size:14px;flex-wrap:wrap}.hero-email a{overflow-wrap:anywhere}.hero-copy{font-size:16px}.hero-notes-link{font-size:14px}.lesson-intro h3{font-size:29px}.lesson-intro p{font-size:16px}.lesson-paper{position:relative;top:auto}.lesson-paper img{height:390px;padding:8px}.lesson-commentary h4{font-size:27px}.lesson-commentary{font-size:16px}.lesson-commentary .equation{font-size:16px}.lesson-navigation{gap:12px}.lesson-thumbnails{justify-content:flex-start!important;overflow-x:auto}.lesson-thumbnails button{min-width:46px}.after-lesson{grid-template-columns:1fr;gap:22px;margin:26px -2px;padding:24px 20px}.after-copy h4{font-size:28px}.after-copy .button{display:flex;justify-content:space-between;font-size:14px}.sheet-pair{max-width:450px;gap:12px}.sheet-pair span{font-size:12px}.about-story{display:block}.about-heading{position:static}.about-heading h2{font-size:40px}.about-heading>p:not(.eyebrow){font-size:16px}.about-track{display:flex;gap:20px;overflow-x:auto;scroll-snap-type:x mandatory;scrollbar-width:thin;align-items:flex-start;padding:5px 0 14px}.about-card{flex:0 0 94%;scroll-snap-align:start;padding:22px;margin:0;border:1px solid #ced9ed;border-radius:12px;background:#f7f9fe;max-width:94%}.about-card p{font-size:16px}.story-number{font-size:80px;margin-bottom:18px}.story-word{font-size:56px}.about-card h3{font-size:25px}.story-controls{display:flex;align-items:center;justify-content:space-between;gap:12px;margin:24px 0 10px;font-size:14px}.story-controls button{border:1px solid #c0cee8;color:var(--blue);border-radius:50%;background:#fff;min-width:44px;min-height:44px}.compact-faq{margin-top:28px}.compact-faq summary,.compact-faq p{font-size:15px}.doc-toolbar>span{font-size:12px;max-width:125px;text-align:right}.after-copy .eyebrow{line-height:1.6}.final-actions .button{font-size:16px}.review-track .review blockquote{font-size:16px}.review-track .review figcaption>a{font-size:12px}.subject p{font-size:16px}.cross-subject{font-size:15px}.topics summary{font-size:14px}.doc-explanation .lesson-commentary{font-size:16px}}
@media(max-width:360px){.hero-proof>div>strong,.hero-proof .proof-source>strong{font-size:32px}.hero-proof .proof-caption,.hero-proof>div>span{font-size:11px}.lesson-paper img{height:335px}.story-word{font-size:45px}.about-card{padding:18px}.about-heading h2{font-size:35px}}
@media(prefers-reduced-motion:reduce){html{scroll-behavior:auto!important}*,*::before,*::after{animation:none!important;transition:none!important}.motion-active .reveal:not(.in-view){opacity:1;transform:none}.story-number,.hero-proof>div{transform:none!important}}
@media print{body{display:none!important}}

/* Bring the manuscript into view sooner on small screens. */
@media(max-width:700px){.examples .section-heading{margin-bottom:18px}.examples .section-heading>p:not(.eyebrow){margin-top:12px}.examples .lesson-subject-picker{margin-bottom:18px}.lesson-intro{margin-bottom:15px}.lesson-intro h3{font-size:26px}.lesson-intro p{font-size:15px;line-height:1.6;margin-top:9px}.lesson-navigation{padding-top:12px}.lesson-thumbnails{padding-top:8px}.lesson-thumbnails button{min-height:58px;flex-direction:row;gap:6px}.lesson-thumbnails img{height:38px;width:27px}.lesson-thumbnails span{font-size:12px}}

/* La colonna fissa termina con le attività; le FAQ sono fuori dal suo contenitore. */
.about-story{min-width:0}.bio .compact-faq{margin-top:48px}.hero-delivery{font-size:15px;line-height:1.65;color:#23457c;margin-top:14px;max-width:580px}.about-heading h2{font-size:clamp(34px,3.5vw,48px)}
@media(max-height:700px){.about-heading{position:static}}
@media(max-width:700px){.bio .compact-faq{margin-top:30px}.about-heading h2{font-size:35px}.hero-delivery{font-size:14px}}

.lesson-social-proof{font-size:14px!important;margin-top:18px}.lesson-social-proof a{font-weight:650}.final-cta .final-social-proof{font-size:15px;line-height:1.7;margin-top:22px}.final-social-proof a{color:inherit;font-weight:750;text-decoration:underline}