@font-face{font-family:Bricolage;src:url('/assets/bricolage-latin.woff2') format('woff2');font-style:normal;font-weight:400 800;font-display:swap}
@font-face{font-family:PublicSans;src:url('/assets/publicsans-latin.woff2') format('woff2');font-style:normal;font-weight:400 700;font-display:swap}
:root{--navy:#18233e;--royal:#234090;--slate:#1c4d78;--sky:#4fb6e9;--paper:#eef7fc;--cream:#fff;--ink:var(--navy);--line:var(--navy);--muted:var(--slate);--shadow:6px 6px 0 var(--line)}
*{box-sizing:border-box}
html{scroll-behavior:smooth}
body{min-height:100vh;min-height:100dvh;display:flex;flex-direction:column;margin:0;background:var(--paper);color:var(--ink);font:16px/1.5 PublicSans,Arial,sans-serif}
main{flex:1}
button,input,select,textarea{font:inherit}
button,a,select{touch-action:manipulation}
button{cursor:pointer}
a{color:inherit}
button:focus-visible,a:focus-visible,input:focus-visible,select:focus-visible,textarea:focus-visible{outline:3px solid var(--navy);outline-offset:4px}
button:disabled{opacity:.45;cursor:not-allowed}
[hidden]{display:none!important}
.skip-link{position:absolute;z-index:100;top:-100px;left:15px;padding:10px;background:#fff;color:var(--navy)}
.skip-link:focus{top:10px}
.site-header{min-height:94px;display:flex;align-items:center;padding:12px clamp(22px,4.3vw,76px);background:var(--navy);border-bottom:6px solid var(--sky)}
.brand{display:inline-flex;align-items:center;gap:12px;text-decoration:none;color:#fff;line-height:1.05}
.site-header .brand:focus-visible{outline-color:var(--sky)}
.brand img{height:66px;width:66px;object-fit:contain}
.brand strong{display:block;font:800 clamp(17px,1.6vw,24px)/1 Bricolage,Arial,sans-serif;letter-spacing:-.04em}
.brand small{display:block;margin-top:6px;font-size:11px;font-weight:800;letter-spacing:.24em}
h1,h2,h3,p{overflow-wrap:break-word}
h1,h2,h3{font-family:Bricolage,Arial,sans-serif}
.button{appearance:none;display:inline-flex;align-items:center;justify-content:space-between;gap:20px;border:3px solid var(--line);box-shadow:var(--shadow);padding:15px 20px;font-size:14px;font-weight:800;text-decoration:none;text-transform:uppercase;letter-spacing:.02em;transition:transform .16s ease,box-shadow .16s ease,background-color .16s ease}
.button:hover{transform:translate(-3px,-3px);box-shadow:9px 9px 0 var(--line)}
.button:active{transform:translate(4px,4px);box-shadow:2px 2px 0 var(--line)}
.button-primary{background:var(--royal);color:#fff}
.button-green{background:var(--sky);color:var(--navy)}
.button-outline{background:var(--cream);color:var(--navy)}
.section-wrap{max-width:1520px;margin:0 auto;padding-left:clamp(22px,5vw,84px);padding-right:clamp(22px,5vw,84px)}
.subject-home{padding-top:clamp(42px,5vw,76px);padding-bottom:60px}
.subject-home h1{font-size:clamp(46px,6vw,76px);line-height:1;letter-spacing:-.065em;margin:0 0 30px;color:var(--royal)}
.subject-grid{display:grid;grid-template-columns:repeat(3,minmax(0,1fr));gap:24px}
.subject-card{position:relative;display:flex;min-height:220px;flex-direction:column;align-items:flex-start;justify-content:space-between;border:3px solid var(--line);background:#fff;box-shadow:var(--shadow);padding:22px;text-decoration:none;transition:transform .16s ease,box-shadow .16s ease}
.subject-card:hover{transform:translate(-3px,-3px);box-shadow:9px 9px 0 var(--line)}
.subject-card:active{transform:translate(4px,4px);box-shadow:2px 2px 0 var(--line)}
.subject-card:nth-child(2){background:var(--sky)}
.subject-card:nth-child(3){background:var(--slate);color:#fff}
.subject-index,.subject-count{font-size:12px;font-weight:800;letter-spacing:.08em;text-transform:uppercase}
.subject-card strong{display:block;max-width:90%;font:800 clamp(30px,3vw,46px)/1.05 Bricolage,Arial,sans-serif;letter-spacing:-.045em}
.subject-arrow{position:absolute;right:20px;bottom:14px;font-size:29px;font-weight:800}
.back-to-subjects{display:inline-block;margin-bottom:17px;font-size:12px;font-weight:800;letter-spacing:.08em;text-transform:uppercase;text-decoration:none}
.back-to-subjects:hover,#source-link:hover{text-decoration:underline;text-decoration-thickness:2px;text-underline-offset:4px}
.page-meta{display:flex;align-items:center;gap:18px}
.page-meta a{font-size:12px;font-weight:800;letter-spacing:.09em;text-transform:uppercase;text-decoration:none}
.practice{padding-top:44px;padding-bottom:75px;scroll-margin-top:25px}
.page-heading{display:flex;flex-wrap:wrap;align-items:end;justify-content:space-between;gap:12px;margin-bottom:27px;padding-bottom:18px;border-bottom:3px solid var(--line)}
.page-heading h1{font-size:clamp(42px,4.2vw,64px);line-height:1;letter-spacing:-.06em;margin:0;font-weight:800;color:var(--royal)}
.page-heading span{font-size:12px;font-weight:800;letter-spacing:.09em;text-transform:uppercase;margin-bottom:5px}
.workspace{display:grid;grid-template-columns:minmax(245px,315px) minmax(0,1fr);gap:28px;align-items:start}
.sidebar{border:3px solid var(--line);background:var(--cream);box-shadow:var(--shadow);padding:0 20px 22px}
.side-title,.solution-heading{display:flex;align-items:center;justify-content:space-between;margin:0 -20px 23px;padding:13px 20px;background:var(--sky);border-bottom:3px solid var(--line);font-size:12px;font-weight:800;letter-spacing:.11em}
.mobile-filter-toggle{display:none}
.field{margin-bottom:19px}
.field label,.mode-group legend,.answer-label{display:block;margin-bottom:8px;font-size:12px;font-weight:800;text-transform:uppercase;letter-spacing:.05em}
.field input,.field select,.quiz textarea{width:100%;border:2px solid var(--line);background:#fff;color:var(--ink);border-radius:0;min-height:47px;padding:10px 12px;outline-offset:2px}
.field input::placeholder,.quiz textarea::placeholder{color:var(--slate)}
.mode-group{border:0;padding:0;margin:0 0 19px;min-width:0}
.mode-group legend{padding:0}
.segmented{display:grid;grid-template-columns:repeat(3,1fr);border:2px solid var(--line);background:#fff}
.segmented button{font-size:12px;font-weight:800;border:0;background:transparent;color:var(--navy);padding:9px 2px;min-height:42px}
.segmented button+button{border-left:2px solid var(--line)}
.segmented button.active{background:var(--royal);color:#fff}
.shuffle-button{display:block;width:100%;padding:11px;text-align:left;font-size:13px;font-weight:800;border:2px solid var(--line);background:#fff;color:var(--navy)}
.shuffle-button[aria-pressed="true"]{background:var(--sky)}
.shuffle-button span{font-size:20px;vertical-align:-1px;margin-right:8px}
.progress-block{margin-top:30px;padding-top:20px;border-top:2px solid var(--line)}
.progress-head{display:flex;align-items:center;justify-content:space-between;font-size:14px;margin-bottom:9px}
.progress-head span{font-weight:800}
.progress-track{height:13px;border:2px solid var(--line);background:var(--paper)}
.progress-track span{display:block;height:100%;background:var(--sky);width:0;transition:width .28s ease}
.stats{display:grid;grid-template-columns:repeat(3,1fr);gap:6px;margin-top:17px}
.stats div{display:flex;flex-direction:column}
.stats strong{font:800 28px/1 Bricolage,Arial,sans-serif}
.stats span{font-size:10px;line-height:1.25;margin-top:5px;font-weight:700;color:var(--muted)}
.save-note{font-size:11px;color:var(--muted);line-height:1.4;margin:22px 0 0}
.quiz{background:var(--cream);border:3px solid var(--line);box-shadow:9px 9px 0 var(--line);min-height:570px}
.quiz-topline{min-height:56px;padding:12px 25px;border-bottom:3px solid var(--line);display:flex;align-items:center;justify-content:space-between;gap:10px;font-size:12px;font-weight:800;letter-spacing:.08em}
.state-chip{display:inline-block;background:var(--paper);border:2px solid var(--line);padding:3px 8px;font-size:10px;white-space:nowrap}
.state-chip.known{background:var(--royal);color:#fff}
.state-chip.review{background:var(--sky)}
.quiz-body{padding:clamp(24px,4vw,57px)}
.topic-label{font-size:12px;font-weight:800;letter-spacing:.1em;color:var(--royal);text-transform:uppercase;margin:0 0 16px}
.quiz h2{font-size:clamp(30px,3.1vw,49px);line-height:1.15;letter-spacing:-.045em;margin:0 0 30px;font-weight:800;max-width:900px}
.quiz h2.long-question{font-size:clamp(24px,2.4vw,36px);line-height:1.22}
.warning{background:var(--paper);border-left:5px solid var(--royal);color:var(--navy);padding:13px 16px;font-size:13px;font-weight:700;line-height:1.5;margin:0 0 26px}
.warning:before{content:"ATTENZIONE · ";font-weight:900}
.question-context{white-space:pre-line;background:var(--paper);border-left:4px solid var(--royal);padding:16px 18px;margin:0 0 28px;font-size:14px;line-height:1.65;overflow-wrap:anywhere}
.options-wrap{border:0;padding:0;margin:0 0 24px;min-width:0}
.options-wrap legend{padding:0;margin-bottom:11px;font-size:12px;font-weight:800;text-transform:uppercase;letter-spacing:.05em}
.options-list{display:grid;gap:10px}
.option-choice{display:flex;align-items:flex-start;gap:10px;border:2px solid var(--line);padding:11px 13px;line-height:1.4;cursor:pointer}
.option-choice:hover{background:var(--paper)}
.option-choice:has(input:checked){background:var(--sky)}
.option-choice input{flex:none;margin:4px 0 0;accent-color:var(--royal)}
.option-choice strong{flex:none;min-width:20px}
.option-choice span{min-width:0;overflow-wrap:anywhere}
.answer-label{margin-bottom:8px}
.answer-label span{font-weight:500;color:var(--muted);text-transform:none;letter-spacing:0;margin-left:5px}
.quiz textarea{display:block;min-height:108px;resize:vertical;line-height:1.5}
.answer-hint{font-size:12px;color:var(--muted);margin:9px 0 24px;max-width:600px}
.solution{border-top:3px solid var(--line);margin-top:33px;padding-top:0}
.solution-heading{margin:0 0 30px;padding:12px 16px;background:var(--sky);border:2px solid var(--line);font-size:11px}
.solution-label{font-size:11px;letter-spacing:.12em;font-weight:800;color:var(--royal);margin:24px 0 8px}
.solution-answer{font:800 clamp(22px,2.1vw,30px)/1.3 Bricolage,Arial,sans-serif;letter-spacing:-.02em;margin:0}
.solution>p:not(.solution-label):not(.solution-answer){font-size:15px;line-height:1.65;max-width:780px;margin:0}
.solution>.warning-detail{font-size:13px!important;line-height:1.5!important;margin:24px 0 0!important;max-width:none!important}
.formula{border:2px solid var(--line);background:var(--paper);padding:14px 16px;margin:26px 0 0}
.formula span{display:block;font-size:11px;font-weight:800;letter-spacing:.1em;margin-bottom:7px}
.formula p{margin:0;white-space:pre-wrap;font-size:14px;line-height:1.5;overflow-wrap:anywhere}
.self-eval{border-top:2px solid var(--line);margin-top:32px;padding-top:24px}
.self-eval p{font:800 20px/1.2 Bricolage,Arial,sans-serif;margin:0 0 14px}
.self-eval div{display:flex;flex-wrap:wrap;gap:12px}
.self-eval .button{font-size:12px;padding:11px 15px;box-shadow:4px 4px 0 var(--line)}
.self-eval .button:hover{box-shadow:7px 7px 0 var(--line)}
.quiz-nav{border-top:3px solid var(--line);display:flex;align-items:center;justify-content:space-between;gap:8px;padding:14px 24px;font-size:12px;font-weight:800}
.quiz-nav button{background:none;border:0;color:var(--navy);font-weight:800;padding:8px 0}
.quiz-nav button:not(:disabled):hover{text-decoration:underline;text-decoration-thickness:2px;text-underline-offset:5px}
.empty-state{min-height:560px;padding:75px 30px;text-align:center;display:flex;align-items:center;justify-content:center;flex-direction:column}
.empty-state>span{color:var(--sky);font-size:80px;line-height:1}
.empty-state h2{margin:14px 0 0;font-size:32px}
.empty-state p{margin:9px 0 25px}
.site-footer{background:var(--navy);color:#fff;border-top:6px solid var(--sky);padding:18px clamp(22px,5vw,84px);font-size:12px;text-align:center}
.site-footer strong{color:#fff}
@media(max-width:1050px){.workspace{grid-template-columns:240px minmax(0,1fr)}.section-wrap{padding-left:28px;padding-right:28px}.sidebar{padding-left:14px;padding-right:14px}.side-title{margin-left:-14px;margin-right:-14px;padding-left:14px;padding-right:14px}}
@media(max-width:900px){.subject-grid{grid-template-columns:1fr}.subject-card{min-height:155px}.subject-card strong{font-size:clamp(30px,5vw,42px)}}
@media(max-width:760px){.site-header{min-height:76px;padding:8px 18px}.brand img{width:54px;height:54px}.brand strong{font-size:17px}.brand small{font-size:9px}.subject-home{padding-top:42px;padding-bottom:58px}.subject-home h1{margin-bottom:28px}.subject-grid{gap:18px}.subject-card{min-height:140px;padding:17px}.practice{padding-top:30px;padding-bottom:65px}.page-heading .page-meta span{display:none}.workspace{display:block}.sidebar{margin-bottom:24px}.quiz-body{padding:26px}.quiz h2{font-size:clamp(30px,6.2vw,43px)}.quiz h2.long-question{font-size:24px;line-height:1.27;letter-spacing:-.025em}}
@media(max-width:760px){.sidebar{padding-bottom:0}.desktop-filter-title{display:none}.mobile-filter-toggle{display:flex;width:calc(100% + 28px);margin-bottom:0;border:0;border-bottom:3px solid var(--line);color:var(--navy);text-align:left;cursor:pointer}.filter-toggle-meta{display:inline-flex;align-items:center;gap:14px}.mobile-filter-toggle[aria-expanded="false"]+.filter-panel{display:none}.filter-panel{padding-top:23px;padding-bottom:22px}}
@media(max-width:430px){.brand{gap:6px}.brand img{width:45px;height:45px}.brand strong{font-size:14px}.brand small{font-size:8px}.quiz-topline{padding:10px 16px}.quiz-nav{padding:10px 15px}.quiz-nav button{font-size:12px}.self-eval .button{width:100%}}
@media(prefers-reduced-motion:reduce){*,*:before,*:after{scroll-behavior:auto!important;animation-duration:.01ms!important;transition-duration:.01ms!important}}