:root{color-scheme:dark;--bg:#1e1e1e;--bg-alt:#252526;--bg-card:#2a2d2e;--fg:#d4d4d4;--fg-muted:#9a9a9a;--accent:#4fc1ff;--accent-2:#ce9178;--ok:#6a9955;--warn:#dcdcaa;--border:#3c3c3c;--radius:10px}*{box-sizing:border-box}body.lezione{background:var(--bg);color:var(--fg);margin:0;font-family:system-ui,sans-serif;line-height:1.55}.layout-lezione{align-items:flex-start;min-height:100vh;display:flex}.contenuto-lezione{flex:1;min-width:0;max-width:900px;margin:0 auto;padding:1.75rem 2rem 4rem}.contenuto-lezione section{margin-bottom:3rem;scroll-margin-top:1.5rem}.contenuto-lezione h1{font-size:1.9rem}.contenuto-lezione h2{color:var(--accent);border-bottom:1px solid var(--border);padding-bottom:.4rem;font-size:1.4rem}.contenuto-lezione h3{color:var(--fg)}.chiave{color:var(--accent);font-weight:600}.evidenzia{background:#4fc1ff29;border-radius:4px;padding:0 .25em}.evidenzia-calda{background:#ce917833;border-radius:4px;padding:0 .25em}.messaggio-chiave{border-left:4px solid 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input:checked+label+.tl-pannello{display:block}.toggle-letture{flex-wrap:wrap;gap:.5rem;margin:1.2rem 0;display:flex}.toggle-letture input{opacity:0;pointer-events:none;position:absolute}.toggle-letture label{cursor:pointer;background:var(--bg-card);border:1px solid var(--border);border-radius:var(--radius);order:1;padding:.5rem 1rem}.toggle-letture input:checked+label{border-color:var(--accent);color:var(--accent)}.toggle-letture .tl-pannello{flex-basis:100%;order:2;margin-top:.6rem;display:none}.toggle-letture input:checked+label+.tl-pannello{display:block}.carta-trascinabile{background:var(--bg-card);border:1px solid var(--accent);cursor:grab;border-radius:8px;margin-bottom:.5rem;padding:.5rem .8rem;font-size:.9rem}.carta-trascinabile:active{cursor:grabbing}.carta-trascinabile.sortable-ghost{opacity:.4}.zona-trascina{border:2px dashed var(--border);border-radius:var(--radius);background:#ffffff05;min-height:3rem;padding:.8rem}.zona-trascina 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