:root{--paper:#f7f8fc;--ink:#182340;--muted:#58657e;--line:#e0e5f0;--lime:#e6eaff;--white:#ffffff}*{box-sizing:border-box}body{margin:0;color:var(--ink);background:var(--paper);font:17px/1.65 system-ui,sans-serif}a{color:inherit;text-underline-offset:5px}button,input{font:inherit}header{max-width:1260px;margin:auto;min-height:112px;display:flex;align-items:center;justify-content:space-between;padding:22px 40px;border-bottom:1px solid var(--line);gap:24px}.brand{display:flex;align-items:center;gap:12px;text-decoration:none;font-size:17px;line-height:1.2}.mark{font-size:54px;font-family:Georgia;line-height:1}nav{display:flex;gap:30px;font-size:14px}nav a{text-decoration:none;padding:8px 0}nav a[aria-current]{border-bottom:2px solid var(--ink)}main{max-width:1260px;margin:auto;padding:0 40px;min-height:65vh}h1,h2,h3{font-family:system-ui,sans-serif;font-weight:750;line-height:1.13}h1{font-size:clamp(42px,6vw,77px);letter-spacing:-2px;margin:20px 0 26px}h2{font-size:36px}h3{font-size:25px;margin:15px 0}.eyebrow{font-size:11px;text-transform:uppercase;letter-spacing:2px;font-weight:700}.hero{display:grid;grid-template-columns:1.15fr 1fr;align-items:center;gap:50px;padding:64px 0 70px}.lead{font-size:19px;color:var(--muted);max-width:650px}.actions{display:flex;gap:18px;align-items:center;flex-wrap:wrap;margin-top:30px}.btn{display:inline-block;border:1px solid var(--ink);padding:13px 23px;border-radius:5px;text-decoration:none;font-size:14px;background:var(--ink);color:white;cursor:pointer}.btn.secondary{background:transparent;color:var(--ink)}.art{background:var(--ink);aspect-ratio:1/1;position:relative;border-radius:50% 50% 4px 4px;overflow:hidden;color:#d9efbc}.art svg{width:100%;height:100%}.art-caption{position:absolute;bottom:24px;width:100%;text-align:center;font-size:11px;letter-spacing:2px}.strip{border-top:1px solid var(--line);border-bottom:1px solid var(--line);display:flex;justify-content:space-between;gap:20px;padding:18px 0;font-size:13px;color:var(--muted)}section{padding:38px 0}.section-head{display:flex;justify-content:space-between;gap:20px;align-items:center}.cards{display:grid;grid-template-columns:1fr 1fr;gap:22px}.card{border:1px solid var(--line);background:var(--white);padding:30px;border-radius:7px}.card p{color:var(--muted)}.card.math{border-top:4px solid #839d5a}.card.physics{border-top:4px solid #5b8eac}.card a{font-size:14px;font-weight:600}.tag{font-size:11px;letter-spacing:.4px;padding:5px 9px;border-radius:30px;background:#e8e9e1;display:inline-block}.tag.ready{background:var(--lime)}.callout{background:#e9edde;padding:30px 36px;border-radius:7px;margin:30px 0}.page-head{padding:50px 0 25px;max-width:850px}.page-head h1{font-size:56px}.modules{display:grid;gap:14px;margin:15px 0 60px}details.module{background:var(--white);border:1px solid var(--line);border-radius:6px}summary{padding:23px;cursor:pointer;display:flex;gap:20px;align-items:center}summary .num{color:#7b8871;font-size:14px}summary strong{flex:1;font-weight:500;font-size:20px}summary:after{content:'+';font-size:23px}details[open] summary:after{content:'−'}details .inside{padding:0 25px 24px 65px;max-width:900px;color:var(--muted)}.steps{counter-reset:steps;list-style:none;padding:0;max-width:850px}.steps li{padding:22px 0 22px 65px;border-bottom:1px solid var(--line);position:relative}.steps li:before{counter-increment:steps;content:counter(steps,decimal-leading-zero);position:absolute;left:0;color:#72815f}.steps p{margin:5px 0}.reading{max-width:760px;margin:auto;padding-bottom:50px}.reading h1{font-size:48px}.reading h2{font-size:29px;margin-top:40px}.reading p{line-height:1.85}.formula{background:#e9edde;padding:20px;text-align:center;font:28px Georgia;border-radius:5px}.answer{background:var(--white);border:1px solid var(--line);padding:18px;margin:15px 0}.answer summary{padding:0;font-size:15px}.answer summary:after{margin-left:auto}input{max-width:160px;padding:10px;border:1px solid #8b9887;border-radius:5px;margin:10px 12px 10px 0}.feedback{min-height:30px}.reading label{display:block;font-weight:600}.completed{background:var(--lime);color:var(--ink)}footer{border-top:1px solid var(--line);max-width:1180px;margin:30px auto 0;padding:35px 0;color:var(--muted);font-size:13px}footer div{display:flex;gap:30px;margin:20px 0}footer small{font-size:11px}.skip{position:absolute;top:-100px}.skip:focus{top:0;background:white;padding:10px;z-index:5}:focus-visible{outline:3px solid #c08222;outline-offset:4px}@media(max-width:760px){header{padding:20px;display:block}nav{gap:18px;overflow:auto;margin-top:22px;font-size:12px}main{padding:0 20px}.hero{grid-template-columns:1fr;padding-top:35px;gap:30px}.art{max-width:400px;width:100%;margin:auto}.cards{grid-template-columns:1fr}.strip{flex-wrap:wrap;font-size:12px}.page-head h1{font-size:43px}.section-head{display:block}summary{gap:12px;padding:18px}summary strong{font-size:17px}.tag{font-size:10px}details .inside{padding:0 20px 20px}.reading h1{font-size:38px}footer{padding:25px 20px}footer div{flex-direction:column;gap:12px}.card{padding:24px}.callout{padding:24px}}

/* Accademia digitale */
body{background:radial-gradient(ellipse at 85% 8%,#ecebff 0,transparent 35%),var(--paper)}
header{max-width:none;padding:20px max(32px,calc((100vw - 1180px)/2));min-height:92px;background:#ffffffed;gap:32px}
.brand{font-weight:650;letter-spacing:-.5px}.brand b{font-weight:800}.mark{width:48px;height:48px;border-radius:14px;display:grid;place-items:center;background:linear-gradient(135deg,#4261ed,#7951dc);color:white;font-family:system-ui;font-size:39px;box-shadow:0 5px 15px #4e5bd529}
nav{gap:12px;font-weight:600}nav a{padding:9px 14px;border-radius:9px}nav a:hover{background:#f0f2ff}nav a[aria-current]{border:0;background:#eaf0ff;color:#3551c9}
.hero{padding:65px 0 60px;gap:50px;grid-template-columns:1.1fr 1fr}h1{font-size:clamp(42px,5.5vw,72px);letter-spacing:-3px;line-height:1.06}h1 em{font-style:normal;background:linear-gradient(100deg,#345bdd,#8950d8);background-clip:text;color:transparent}h2{font-size:31px;letter-spacing:-1px}h3{font-size:23px;letter-spacing:-.6px}.eyebrow{color:#5364bd;letter-spacing:1.6px}.lead{font-size:18px}.btn{background:#4260e5;border-color:#4260e5;border-radius:11px;font-weight:650;box-shadow:0 5px 12px #4260e522}.btn:hover{background:#304bc6}.btn.secondary{box-shadow:none}.actions>a:not(.btn){font-size:14px;font-weight:650}.strip{background:white;border:1px solid var(--line);border-radius:14px;padding:20px 24px}.cards{gap:24px}.card{border-radius:18px;padding:30px;box-shadow:0 6px 24px #24396706}.card.math,.card.physics{border-top:1px solid var(--line)}.card.math .eyebrow{color:#4260d8}.card.physics .eyebrow{color:#7c45be}.card.math{background:linear-gradient(130deg,#fff 65%,#eff2ff)}.card.physics{background:linear-gradient(130deg,#fff 65%,#f2ebff)}.card a{color:#3856d1}.callout{background:#edf1ff;border:1px solid #dae2ff;border-radius:16px}.tag{background:#edf0f6;color:#52617c;font-weight:600}.tag.ready{background:#e0f3eb;color:#216b50}.page-head h1{letter-spacing:-2px}details.module{border-radius:14px;overflow:hidden}summary strong{font-weight:650}summary .num{background:#eef1ff;color:#5267bf;padding:5px 9px;border-radius:7px}summary:after{color:#5570d2}details[open]{border-color:#b9c6f2}details[open] summary{background:#f2f5ff}details .inside{padding-top:12px}.formula{background:#edf1ff}.answer{border-radius:12px}.completed,.completed:hover{background:#e0f3eb;border-color:#c1e4d6;color:#216b50;box-shadow:none}footer{padding-top:35px}.reading h1{line-height:1.15}.reading h2{letter-spacing:-.6px}.steps li:before{font-weight:700;background:#eaf0ff;color:#4662be;width:38px;height:38px;border-radius:11px;display:grid;place-items:center}.academy-panel{position:relative;border:1px solid #e1e5f4;border-radius:24px;background:white;box-shadow:0 24px 70px #3e4f9f15;padding:27px;transform:rotate(1deg)}.panel-top{display:flex;align-items:center;justify-content:space-between;padding-bottom:20px;border-bottom:1px solid var(--line);font-size:13px;font-weight:650}.panel-top span:first-child{display:flex;align-items:center;gap:8px}.status-dot{width:7px;height:7px;background:#45a17d;border-radius:50%;display:inline-block}.panel-path{display:flex;gap:8px;margin:22px 0 18px;align-items:center;font-size:12px;color:var(--muted)}.panel-path b{padding:5px 10px;background:#edf0ff;border-radius:7px;color:#5264c2}.lesson-preview{border-radius:16px;background:linear-gradient(125deg,#3e5ae0,#7250d3);color:white;padding:25px;overflow:hidden;position:relative}.lesson-preview h3{font-size:28px;position:relative;z-index:1;margin:16px 0 8px}.lesson-preview p{font-size:13px;color:#ebeaff;margin:0}.lesson-preview .eyebrow{color:#e5e6ff;font-size:10px}.lesson-symbol{position:absolute;right:15px;bottom:0;font-size:140px;font-weight:300;color:#ffffff12;line-height:1}.panel-link{display:block;margin:18px 0 0;background:#fff;color:#3f55c5;padding:9px 15px;border-radius:9px;text-decoration:none;font-size:13px;font-weight:700;text-align:center;position:relative}.panel-label{font-size:10px;letter-spacing:1.3px;color:#75829e;font-weight:700;margin:22px 0 10px}.mini-course{display:flex;align-items:center;gap:12px;padding:13px 0;border-bottom:1px solid #edf0f7;font-size:13px}.mini-course strong{display:block;font-size:13px}.mini-course small{font-size:11px;color:#74809a}.mini-icon{background:#eaf0ff;border-radius:10px;width:38px;height:38px;display:grid;place-items:center;color:#4d65cf;font-size:21px}.mini-course:nth-last-child(1) .mini-icon{background:#f2ebff;color:#8551bc}.panel-note{text-align:center;color:#71809c;font-size:11px;margin:18px 0 0}
@media(max-width:760px){header{padding:18px 20px}nav{gap:4px;flex-wrap:wrap;overflow:visible}nav a{padding:7px 9px}.hero{grid-template-columns:1fr;padding:35px 0;gap:30px}h1{letter-spacing:-2px}.academy-panel{transform:none;padding:20px;max-width:460px;width:100%;margin:auto}.strip{padding:17px;gap:10px;flex-direction:column}.page-head h1{font-size:40px}summary strong{font-size:16px}.section-head .eyebrow{display:block;margin-bottom:20px}footer{padding:25px 20px}}

/* Apprendimento visuale: identità luminosa e geometrica */
:root{--paper:#ffffff;--ink:#111c55;--muted:#526286;--line:#e3e8f4}
body{background:linear-gradient(180deg,#fff 0,#fbfcff 75%,#fff 100%)}header{background:white;border-bottom:1px solid #eef0fa}.mark{background:linear-gradient(120deg,#0061ef,#9d6ade,#ff9629);box-shadow:none;border-radius:50%;font-size:43px}nav a[aria-current]{background:#eef5ff;color:#0058df}h1 em{background:linear-gradient(95deg,#8c5bd5 5%,#d5718f 47%,#ff8100 85%);background-clip:text}h1{font-weight:800;letter-spacing:-2.8px}.hero{gap:12px;grid-template-columns:1fr 1.15fr;padding:55px 0 48px}.hero .lead:first-of-type{font-size:23px;font-weight:550;color:var(--ink);line-height:1.4}.hero .lead{font-size:17px}.eyebrow{color:#3864bc}.hero .eyebrow{background:#f1edff;color:#6c49b5;border-radius:30px;padding:8px 14px;font-size:10px}.btn{background:#005bec;border-color:#005bec;border-radius:30px;padding:13px 24px;box-shadow:0 7px 20px #0759e51a}.btn:hover{background:#084dcc}.actions>a:not(.btn){border:1px solid #b6cbf4;color:#0758d6;padding:12px 20px;border-radius:30px;text-decoration:none}.visual-art{position:relative;min-width:0;background:radial-gradient(ellipse at 70% 40%,#fff2e8 0,transparent 55%),radial-gradient(ellipse at 30% 65%,#eaf1ff 0,transparent 65%);border-radius:45% 30% 35% 25%;padding:8px 0 24px}.visual-art img{display:block;width:100%;height:auto}.art-pill{display:block;margin:0 auto;text-align:center;width:max-content;max-width:95%;border:1px solid #e6dff7;background:#ffffffdc;color:#7156aa;font-size:11px;border-radius:30px;padding:7px 15px}.strip{background:#fff;border-radius:0;border-left:0;border-right:0;padding:20px 4px;color:#53628a}.cards{gap:22px}.card.math{background:linear-gradient(110deg,#eaf6ff,#dfedff);border:none}.card.physics{background:linear-gradient(110deg,#f5eeff,#ede7ff);border:none}.card{position:relative;overflow:hidden;padding:30px 34px;box-shadow:none;border-radius:22px}.card h3{font-size:30px;margin:10px 0 14px}.card p{max-width:400px;color:#405784}.card.physics p{color:#615482}.course-icon{float:right;width:64px;height:64px;border-radius:20px;display:grid;place-items:center;background:linear-gradient(145deg,#609cff,#1263ec);color:white;font-size:40px;font-weight:500;box-shadow:0 8px 20px #4281e32a}.physics .course-icon{background:linear-gradient(145deg,#bc9aee,#8252ca)}.course-topics{display:flex;gap:8px;flex-wrap:wrap;margin:22px 0}.course-topics span{font-size:11px;background:#ffffffa8;border-radius:20px;padding:5px 10px;color:#425d93}.physics .course-topics span{color:#705096}.card a{color:#0758dc;display:inline-block;margin-top:4px}.callout{background:linear-gradient(110deg,#fff8ef,#fff 85%);border:1px solid #f3dfc7;border-radius:18px}.tag.ready{background:#fff0d9;color:#8d4b06}.page-head{max-width:900px}.page-head h1{font-weight:800}.module summary .num{background:#ecf2ff;color:#195cc9}.modules details:nth-child(3n+2) summary .num{background:#f1eaff;color:#8250c4}.modules details:nth-child(3n) summary .num{background:#fff0dd;color:#97520a}.formula{background:#f0f4ff}.completed,.completed:hover{background:#e0f3eb;color:#216b50;border-color:#c1e4d6}.reading .callout{background:#f4f1ff;border-color:#e2d9f4}.reading .actions>a:not(.btn){font-size:13px;padding:8px 14px}footer{border-color:#e8ecf8}.steps li:nth-child(2n):before{background:#f2eaff;color:#8551b6}
@media(max-width:760px){.hero{grid-template-columns:1fr;padding-top:35px;gap:15px}.hero .lead:first-of-type{font-size:20px}.visual-art{max-width:520px;margin:auto}.visual-art img{max-height:340px}.card{padding:26px}.card h3{font-size:27px}.course-icon{width:50px;height:50px;font-size:33px;border-radius:15px}.course-topics{gap:6px}.strip{font-size:12px}.actions{gap:10px}.actions>a:not(.btn){padding:11px 17px}}


/* Lezione modello */
.lesson-section{padding:10px 0;scroll-margin-top:24px}.lesson-section h2{margin-top:28px}.lesson-intro,.worked{background:#f0f5ff;padding:22px 26px;border-radius:16px;margin:24px 0}.worked{border-left:4px solid #6b91ee}.worked p:last-child{margin-bottom:0}.lesson-index{display:flex;flex-wrap:wrap;gap:8px;margin:28px 0;padding:18px;border:1px solid var(--line);border-radius:16px}.lesson-index b{flex-basis:100%;font-size:15px}.lesson-index a{font-size:13px;background:#f5f1ff;padding:7px 10px;border-radius:20px}.number-line{width:100%;height:auto;color:#2456b7;background:#f3f6ff;border-radius:12px}.symbol-list{padding:5px 22px;border-left:3px solid #a980dc}select{font:inherit;max-width:100%;padding:10px;border:1px solid #899abd;border-radius:8px;background:white;color:var(--ink);margin:10px 0}.check-feedback{font-size:15px;margin:0 0 20px}.reading li{margin:9px 0}#lesson-check{background:#f6f4fd;padding:24px;border-radius:16px}#check-result{font-weight:600}.lesson-section:focus{outline:none}@media(max-width:480px){.lesson-intro,.worked,#lesson-check{padding:18px}.reading h2{font-size:26px}.lesson-index{gap:6px}.lesson-index a{font-size:12px}}