/* Layout: registro di classe. Barra in alto con le sezioni, colonna centrale di lettura, elenchi a righe come un quaderno. */
:root{
  --paper:#f6f7f4; --sheet:#ffffff; --ink:#1d2421; --muted:#5d6762; --rule:#dfe3de;
  --green:#1f6b55; --green-soft:#e3efe9; --mark:#f3e27a; --mark-ink:#4a3f00;
  --ok:#2f7d32; --bad:#b3372b; --bad-soft:#f8e5e2;
  --f-display:"Young Serif", Georgia, serif;
  --f-body:"Source Sans 3", "Segoe UI", system-ui, sans-serif;
  --f-mono:"IBM Plex Mono", ui-monospace, monospace;
}
@media (prefers-color-scheme: dark){:root:not([data-theme="light"]){
  --paper:#151a18; --sheet:#1c2320; --ink:#e7ece9; --muted:#9aa6a0; --rule:#2c3531;
  --green:#6cc3a4; --green-soft:#1f3a31; --mark:#6b5d12; --mark-ink:#fff3b0;
  --ok:#7fcf83; --bad:#f08b7e; --bad-soft:#3d2320; color-scheme:dark }}
:root[data-theme="dark"]{
  --paper:#151a18; --sheet:#1c2320; --ink:#e7ece9; --muted:#9aa6a0; --rule:#2c3531;
  --green:#6cc3a4; --green-soft:#1f3a31; --mark:#6b5d12; --mark-ink:#fff3b0;
  --ok:#7fcf83; --bad:#f08b7e; --bad-soft:#3d2320; color-scheme:dark }
html,body{background:var(--paper)}
body{color:var(--ink);font-family:var(--f-body);font-size:16px;line-height:1.55}
body::before{content:"";position:fixed;inset:0 0 auto;height:env(safe-area-inset-top,0px);z-index:10;background:var(--sheet)}
a{color:var(--green)}
h1,h2,h3{font-family:var(--f-display);font-weight:400;text-wrap:balance;margin:0}
h2{font-size:1.6rem} h3{font-size:1.15rem}
.wrap{max-width:860px;margin:0 auto;padding-left:max(16px,env(safe-area-inset-left,0px));padding-right:max(16px,env(safe-area-inset-right,0px))}
header{position:sticky;top:env(safe-area-inset-top,0px);z-index:5;background:var(--sheet);border-bottom:1px solid var(--rule)}
.top{display:flex;align-items:center;justify-content:space-between;gap:12px;padding-block:12px 4px;flex-wrap:wrap}
.brand{font-family:var(--f-display);font-size:1.25rem}
.brand small{font-family:var(--f-body);font-size:.8rem;color:var(--muted);margin-left:8px}
.sync{font-size:.78rem;color:var(--muted)}
nav{display:flex;gap:4px;overflow-x:auto;padding-block:4px 0;scrollbar-width:none}
nav a{padding:8px 12px;text-decoration:none;color:var(--muted);font-weight:600;border-bottom:3px solid transparent;white-space:nowrap}
nav a[aria-current="page"]{color:var(--ink);border-color:var(--green)}
main{padding-block:28px 64px}
section.view{display:flex;flex-direction:column;gap:24px}
.lead{color:var(--muted);max-width:62ch;margin:6px 0 0}
.panel{background:var(--sheet);border:1px solid var(--rule);border-radius:6px;padding:18px}
.grid{display:grid;grid-template-columns:repeat(auto-fit,minmax(220px,1fr));gap:12px}
.stat .n{font-family:var(--f-mono);font-size:1.9rem;font-variant-numeric:tabular-nums}
.stat .l{color:var(--muted);font-size:.85rem;text-transform:uppercase;letter-spacing:.06em}
.bar{height:8px;background:var(--rule);border-radius:4px;overflow:hidden}
.bar i{display:block;height:100%;background:var(--green)}
.subjects{display:grid;grid-template-columns:repeat(auto-fit,minmax(240px,1fr));gap:10px}
.subj{display:flex;flex-direction:column;gap:8px;text-align:left;background:var(--sheet);border:1px solid var(--rule);border-radius:6px;padding:14px;cursor:pointer;color:var(--ink);font:inherit}
.subj:hover{border-color:var(--green)}
.subj b{font-weight:600}
.subj span{font-size:.85rem;color:var(--muted);font-variant-numeric:tabular-nums}
.chip{display:inline-block;font-family:var(--f-mono);font-size:.72rem;padding:1px 6px;border-radius:3px;background:var(--green-soft);color:var(--green)}
.chip.star{background:var(--mark);color:var(--mark-ink)}
ul.topics{list-style:none;margin:0;padding:0;border-top:1px solid var(--rule)}
ul.topics li{display:grid;grid-template-columns:auto 1fr auto;gap:12px;align-items:start;padding:10px 4px;border-bottom:1px solid var(--rule)}
ul.topics li.done .t{text-decoration:line-through;color:var(--muted)}
ul.topics input{width:20px;height:20px;margin-top:2px;accent-color:var(--green)}
.t{min-width:0}
.t small{display:block;color:var(--muted)}
button,.btn{font:inherit;font-weight:600;border-radius:5px;border:1px solid var(--green);background:var(--green);color:var(--sheet);padding:9px 16px;cursor:pointer;text-decoration:none;display:inline-block}
button.ghost,.btn.ghost{background:transparent;color:var(--green)}
button:disabled{opacity:.5;cursor:default}
button:focus-visible,a:focus-visible,input:focus-visible,select:focus-visible,textarea:focus-visible{outline:3px solid var(--mark);outline-offset:2px}
.row{display:flex;gap:10px;flex-wrap:wrap;align-items:center}
select,textarea{font:inherit;color:var(--ink);background:var(--sheet);border:1px solid var(--rule);border-radius:5px;padding:8px}
textarea{width:100%;min-height:140px;box-sizing:border-box}
.q{font-size:1.15rem;font-weight:600}
.opts{display:flex;flex-direction:column;gap:8px}
.opt{text-align:left;background:var(--sheet);color:var(--ink);border:1px solid var(--rule);font-weight:400}
.opt.right{border-color:var(--ok);box-shadow:inset 4px 0 0 var(--ok)}
.opt.wrong{border-color:var(--bad);background:var(--bad-soft)}
.expl{color:var(--muted)}
.phase{display:grid;grid-template-columns:150px 1fr;gap:14px;padding:14px 0;border-bottom:1px solid var(--rule)}
.phase.now{background:var(--green-soft);margin-inline:-12px;padding-inline:12px;border-radius:4px}
.phase .d{font-family:var(--f-mono);font-size:.82rem;color:var(--muted);font-variant-numeric:tabular-nums}
.note{font-size:.88rem;color:var(--muted)}
.back{background:none;border:none;color:var(--green);padding:0}
.answer{white-space:pre-wrap}
.verdict{font-family:var(--f-mono);font-size:2rem}
@media (max-width:560px){.phase{grid-template-columns:1fr;gap:4px}}
@media (prefers-reduced-motion:reduce){*{transition:none!important}}
/* aggiunte per la versione con server */
input[type=text],input[type=email],input[type=password],input[type=url],input[type=number],input[type=date]{font:inherit;color:var(--ink);background:var(--sheet);border:1px solid var(--rule);border-radius:5px;padding:8px;width:100%;box-sizing:border-box}
.form{display:flex;flex-direction:column;gap:12px;max-width:420px}
.form label{display:flex;flex-direction:column;gap:4px;font-size:.9rem;color:var(--muted)}
.form label.inline{flex-direction:row;align-items:center;gap:8px}
.err{color:var(--bad)}
.ok{color:var(--ok)}
.auth{max-width:440px;margin:48px auto}
table.list{width:100%;border-collapse:collapse;font-size:.92rem}
table.list th,table.list td{text-align:left;padding:8px 6px;border-bottom:1px solid var(--rule);vertical-align:top}
table.list th{color:var(--muted);font-weight:600}
.small{font-size:.85rem;padding:5px 10px}
.danger{border-color:var(--bad);color:var(--bad);background:transparent}
.userbox{display:flex;gap:10px;align-items:center;font-size:.85rem;color:var(--muted)}
.userbox button{padding:4px 10px;font-size:.82rem}
.edit{display:grid;grid-template-columns:80px 1fr;gap:8px;align-items:center}
@media (max-width:560px){.edit{grid-template-columns:1fr}table.list{font-size:.85rem}}
table.list td{overflow-wrap:anywhere}
.panel{min-width:0;overflow-wrap:anywhere}
.video{position:relative;aspect-ratio:16/9;background:#000;border-radius:6px;overflow:hidden}
.video iframe{position:absolute;inset:0;width:100%;height:100%;border:0}
.dispensa h3{margin-top:6px}
.dispensa h4{font-family:var(--f-display);font-weight:400;font-size:1.05rem;margin:18px 0 6px}
.dispensa p,.dispensa li{max-width:68ch}
.dispensa ul,.dispensa ol{padding-left:1.3em}
.dispensa li{margin:4px 0}
.tablewrap{overflow-x:auto;margin:10px 0}
.subj span+span{color:var(--green)}
.t a{color:var(--ink);text-decoration-color:var(--rule)}
.t a:hover{color:var(--green)}
.dispensa table.list td,.dispensa table.list th{overflow-wrap:normal;hyphens:auto;min-width:5.5em}
.dispensa{overflow-wrap:break-word}