/* Appunti di Informatica · UniTo 2026/27 — foglio di stile condiviso da pagina iniziale, pagine dei corsi e lezioni.
   Tema scuro «notte» (blu profondo, acquamarina, ambra) e tema chiaro «giorno»; caratteri IBM Plex Sans e IBM Plex Mono.
   I nomi --paper, --ink, --muted, --edge, --node-* restano per compatibilità con le lezioni già scritte. */

@font-face { font-family: "Plex Sans"; font-style: normal; font-weight: 100 700; font-display: swap; src: url(../fonts/plex-sans-latin.woff2) format("woff2"); unicode-range: U+0000-00FF, U+0131, U+0152-0153, U+02BB-02BC, U+02C6, U+02DA, U+02DC, U+0304, U+0308, U+0329, U+2000-206F, U+20AC, U+2122, U+2191, U+2193, U+2212, U+2215, U+FEFF, U+FFFD; }
@font-face { font-family: "Plex Sans"; font-style: normal; font-weight: 100 700; font-display: swap; src: url(../fonts/plex-sans-latin-ext.woff2) format("woff2"); unicode-range: U+0100-02BA, U+02BD-02C5, U+02C7-02CC, U+02CE-02D7, U+02DD-02FF, U+0304, U+0308, U+0329, U+1D00-1DBF, U+1E00-1E9F, U+1EF2-1EFF, U+2020, U+20A0-20AB, U+20AD-20C0, U+2113, U+2C60-2C7F, U+A720-A7FF; }
@font-face { font-family: "Plex Sans"; font-style: italic; font-weight: 400; font-display: swap; src: url(../fonts/plex-sans-italic-latin.woff2) format("woff2"); unicode-range: U+0000-00FF, U+0131, U+0152-0153, U+02BB-02BC, U+02C6, U+02DA, U+02DC, U+0304, U+0308, U+0329, U+2000-206F, U+20AC, U+2122, U+2191, U+2193, U+2212, U+2215, U+FEFF, U+FFFD; }
@font-face { font-family: "Plex Sans"; font-style: italic; font-weight: 400; font-display: swap; src: url(../fonts/plex-sans-italic-latin-ext.woff2) format("woff2"); unicode-range: U+0100-02BA, U+02BD-02C5, U+02C7-02CC, U+02CE-02D7, U+02DD-02FF, U+0304, U+0308, U+0329, U+1D00-1DBF, U+1E00-1E9F, U+1EF2-1EFF, U+2020, U+20A0-20AB, U+20AD-20C0, U+2113, U+2C60-2C7F, U+A720-A7FF; }
@font-face { font-family: "Plex Mono"; font-style: normal; font-weight: 400; font-display: swap; src: url(../fonts/plex-mono-400-latin.woff2) format("woff2"); unicode-range: U+0000-00FF, U+0131, U+0152-0153, U+02BB-02BC, U+02C6, U+02DA, U+02DC, U+0304, U+0308, U+0329, U+2000-206F, U+20AC, U+2122, U+2191, U+2193, U+2212, U+2215, U+FEFF, U+FFFD; }
@font-face { font-family: "Plex Mono"; font-style: normal; font-weight: 400; font-display: swap; src: url(../fonts/plex-mono-400-latin-ext.woff2) format("woff2"); unicode-range: U+0100-02BA, U+02BD-02C5, U+02C7-02CC, U+02CE-02D7, U+02DD-02FF, U+0304, U+0308, U+0329, U+1D00-1DBF, U+1E00-1E9F, U+1EF2-1EFF, U+2020, U+20A0-20AB, U+20AD-20C0, U+2113, U+2C60-2C7F, U+A720-A7FF; }
@font-face { font-family: "Plex Mono"; font-style: normal; font-weight: 500; font-display: swap; src: url(../fonts/plex-mono-500-latin.woff2) format("woff2"); unicode-range: U+0000-00FF, U+0131, U+0152-0153, U+02BB-02BC, U+02C6, U+02DA, U+02DC, U+0304, U+0308, U+0329, U+2000-206F, U+20AC, U+2122, U+2191, U+2193, U+2212, U+2215, U+FEFF, U+FFFD; }
@font-face { font-family: "Plex Mono"; font-style: normal; font-weight: 500; font-display: swap; src: url(../fonts/plex-mono-500-latin-ext.woff2) format("woff2"); unicode-range: U+0100-02BA, U+02BD-02C5, U+02C7-02CC, U+02CE-02D7, U+02DD-02FF, U+0304, U+0308, U+0329, U+1D00-1DBF, U+1E00-1E9F, U+1EF2-1EFF, U+2020, U+20A0-20AB, U+20AD-20C0, U+2113, U+2C60-2C7F, U+A720-A7FF; }
@font-face { font-family: "Plex Mono"; font-style: normal; font-weight: 600; font-display: swap; src: url(../fonts/plex-mono-600-latin.woff2) format("woff2"); unicode-range: U+0000-00FF, U+0131, U+0152-0153, U+02BB-02BC, U+02C6, U+02DA, U+02DC, U+0304, U+0308, U+0329, U+2000-206F, U+20AC, U+2122, U+2191, U+2193, U+2212, U+2215, U+FEFF, U+FFFD; }
@font-face { font-family: "Plex Mono"; font-style: normal; font-weight: 600; font-display: swap; src: url(../fonts/plex-mono-600-latin-ext.woff2) format("woff2"); unicode-range: U+0100-02BA, U+02BD-02C5, U+02C7-02CC, U+02CE-02D7, U+02DD-02FF, U+0304, U+0308, U+0329, U+1D00-1DBF, U+1E00-1E9F, U+1EF2-1EFF, U+2020, U+20A0-20AB, U+20AD-20C0, U+2113, U+2C60-2C7F, U+A720-A7FF; }

/* ---------- colori: notte (predefinito) ---------- */
:root {
  color-scheme: dark;
  --bg: #080d19; --bg-2: #0c1324; --surface: #0f182c; --surface-2: #142038; --surface-3: #1a2844;
  --line: #1c2a45; --line-2: #283a5e; --line-3: #3a5080;
  --text: #e3e9f5; --text-2: #aab5cc; --text-3: #7a88a6;
  --accent: #3fe0cc; --accent-ink: #062a27; --accent-soft: rgba(63, 224, 204, .12); --accent-line: rgba(63, 224, 204, .38);
  --blue: #7fa8ff; --blue-soft: rgba(127, 168, 255, .1);
  --amber: #ffc45e; --amber-soft: rgba(255, 196, 94, .1);
  --rose: #ff7c93; --rose-soft: rgba(255, 124, 147, .1);
  --violet: #b9a0ff; --violet-soft: rgba(185, 160, 255, .09);
  --green: #6fe0a0; --green-soft: rgba(111, 224, 160, .1);
  --shadow: 0 1px 0 rgba(255, 255, 255, .03) inset, 0 18px 40px -24px rgba(0, 0, 0, .8);
  --shadow-2: 0 24px 60px -28px rgba(0, 0, 0, .9);
  --barra-bg: rgb(8, 13, 25);
  --rete-impulso: 63, 224, 204; --rete-caldo: 255, 196, 94; --rete-forza: 1;
  /* nomi usati dalle lezioni */
  --paper: var(--surface); --paper-2: var(--surface-2); --ink: var(--text); --ink-2: var(--text-2); --muted: var(--text-3);
  --rule: var(--line-2); --rule-soft: var(--line); --link: var(--accent); --link-hover: #8af3e6;
  --def: var(--blue); --def-bg: var(--blue-soft); --red: var(--rose); --red-bg: var(--rose-soft); --ok: var(--green); --ok-bg: var(--green-soft);
  --amber-bg: var(--amber-soft); --code-bg: #0a1222; --grid: rgba(127, 168, 255, .07);
  --node-action: #16284a; --node-test: #133329; --node-term: #e3e9f5; --node-term-ink: #0a1222; --edge: #8593b0; --active: var(--accent); --shade: rgba(0, 0, 0, .55);
  --sans: "Plex Sans", "IBM Plex Sans", -apple-system, BlinkMacSystemFont, "Segoe UI", "Noto Sans", Helvetica, Arial, sans-serif;
  --mono: "Plex Mono", "IBM Plex Mono", ui-monospace, SFMono-Regular, Menlo, Consolas, "Liberation Mono", monospace;
  --c-prog1: #3fe0cc; --c-fda: #7fa8ff; --c-mdag: #b9a0ff; --c-anmat: #ffc45e; --c-arch: #ff9670; --c-prog2: #6fe0a0; --c-ro: #ff82c6; --c-inglese: #6ccaff;
  --c: var(--accent);
  --raggio: 14px; --raggio-2: 10px; --raggio-3: 6px;
  --morbido: cubic-bezier(.2, .8, .2, 1);
}
/* ---------- giorno (scelto con il pulsante del tema; senza scelta il sito è in notte) ---------- */
:root[data-theme="light"] {
  color-scheme: light;
  --bg: #f3f6fc; --bg-2: #eaf0f9; --surface: #ffffff; --surface-2: #f6f8fd; --surface-3: #edf2fb;
  --line: #dde4f0; --line-2: #c9d3e5; --line-3: #a9b7d0;
  --text: #0e1830; --text-2: #3b4863; --text-3: #637091;
  --accent: #087f78; --accent-ink: #ffffff; --accent-soft: rgba(8, 127, 120, .09); --accent-line: rgba(8, 127, 120, .35);
  --blue: #2b5fcf; --blue-soft: rgba(43, 95, 207, .07);
  --amber: #9a5b00; --amber-soft: rgba(214, 140, 20, .1);
  --rose: #c02c4b; --rose-soft: rgba(192, 44, 75, .07);
  --violet: #6546d4; --violet-soft: rgba(101, 70, 212, .07);
  --green: #1b7a46; --green-soft: rgba(27, 122, 70, .08);
  --shadow: 0 1px 2px rgba(14, 24, 48, .05), 0 12px 28px -18px rgba(14, 24, 48, .28);
  --shadow-2: 0 24px 50px -30px rgba(14, 24, 48, .45);
  --barra-bg: rgb(243, 246, 252);
  --rete-impulso: 8, 127, 120; --rete-caldo: 214, 140, 20; --rete-forza: .8;
  --link-hover: #065f5a; --code-bg: #f4f7fc; --grid: rgba(43, 95, 207, .08);
  --node-action: #e6eefc; --node-test: #e3f4ec; --node-term: #0e1830; --node-term-ink: #ffffff; --edge: #5d6b88; --shade: rgba(14, 24, 48, .16);
  --c-prog1: #087f78; --c-fda: #2b5fcf; --c-mdag: #6546d4; --c-anmat: #9a5b00; --c-arch: #b8481c; --c-prog2: #1b7a46; --c-ro: #a8297a; --c-inglese: #1a6fa8;
}
/* ---------- OLED (pulsante «OLED»): nero puro e colore principale bianco; restano i colori dello sfondo animato,
   dei riquadri e dei corsi ---------- */
:root[data-theme="oled"] {
  color-scheme: dark;
  --bg: #000; --bg-2: #000; --surface: #070707; --surface-2: #0c0c0c; --surface-3: #151515;
  --line: #1d1d1d; --line-2: #2b2b2b; --line-3: #434343;
  --text: #f5f5f5; --text-2: #bcbcbc; --text-3: #8e8e8e;
  --accent: #ffffff; --accent-ink: #000000; --accent-soft: rgba(255, 255, 255, .08); --accent-line: rgba(255, 255, 255, .32);
  --link-hover: #cfcfcf; --barra-bg: rgb(0, 0, 0); --code-bg: #050505; --grid: rgba(255, 255, 255, .06);
  --node-action: #121212; --node-test: #0f0f0f; --node-term: #f5f5f5; --node-term-ink: #000000; --edge: #8e8e8e;
  --shadow: 0 1px 0 rgba(255, 255, 255, .03) inset, 0 18px 40px -24px rgba(0, 0, 0, .9);
  --shadow-2: 0 24px 60px -28px rgba(0, 0, 0, .95);
}
[data-corso="PROG1"] { --c: var(--c-prog1); } [data-corso="FDA"] { --c: var(--c-fda); } [data-corso="MDAG"] { --c: var(--c-mdag); } [data-corso="ANMAT"] { --c: var(--c-anmat); }
[data-corso="ARCH"] { --c: var(--c-arch); } [data-corso="PROG2"] { --c: var(--c-prog2); } [data-corso="RO"] { --c: var(--c-ro); } [data-corso="INGLESE"], [data-corso="ENGLISH"] { --c: var(--c-inglese); }
/* ---------- base ---------- */
*, *::before, *::after { box-sizing: border-box; }
[hidden] { display: none !important; }
html { -webkit-text-size-adjust: 100%; scroll-behavior: smooth; scroll-padding-top: 84px; }
body { margin: 0; min-height: 100vh; background: var(--bg); color: var(--text); font: 400 1.0625rem/1.68 var(--sans); overflow-wrap: break-word; -webkit-font-smoothing: antialiased; }
/* sfumatura grigia dei caratteri: su Windows il ClearType colora i bordi delle lettere e sullo sfondo scuro sembrano mozzate.
   Non sul body, che deve restare senza trasformazioni perché lo sfondo animato è fisso */
.barra, .pagina, .piede { will-change: transform; }
img, svg { max-width: 100%; }
a { color: var(--link); text-decoration-color: var(--accent-line); text-decoration-thickness: 1px; text-underline-offset: .2em; transition: color .15s, text-decoration-color .15s; }
a:hover { color: var(--link-hover); text-decoration-color: currentColor; }
:focus-visible { outline: 2px solid var(--accent); outline-offset: 2px; border-radius: 3px; }
::selection { background: var(--accent); color: var(--accent-ink); }
strong, b { font-weight: 600; color: var(--text); }
code, pre, kbd, .mono { font-family: var(--mono); }
code { font-size: .86em; background: var(--surface-3); border: 1px solid var(--line); padding: .08em .35em; border-radius: 5px; color: var(--text); }
h1, h2, h3, h4 { color: var(--text); line-height: 1.2; text-wrap: balance; }
p { margin: 0 0 1rem; }
ul, ol { padding-left: 1.3em; margin: 0 0 1rem; }
li { margin: .3rem 0; }
li::marker { color: var(--text-3); }
hr { border: 0; border-top: 1px solid var(--line); margin: 2rem 0; }

/* sfondo animato (rete.js): due canvas, dal basso l'alone e gli incroci accesi vicino al puntatore, poi impulsi e onde
   (le righe della rete non si disegnano: sugli schermi non OLED o con la luminosità alta si vedevano).
   Più tenue dietro la colonna del testo e pieno ai lati, a metà sugli schermi stretti: lo disegna già così rete.js, perché una
   maschera o un'opacità sopra strati che cambiano a ogni fotogramma costano memoria e lavoro alla scheda grafica */
.sfondo { position: fixed; inset: 0; z-index: 0; pointer-events: none; overflow: hidden; contain: strict; }
.sfondo canvas { position: absolute; left: 0; top: 0; display: block; }
.sfondo .incroci { will-change: transform; }
.barra, .pagina, .piede, .salta { position: relative; z-index: 1; }
.salta { position: absolute; left: 12px; top: -60px; z-index: 50; background: var(--accent); color: var(--accent-ink); padding: .5rem .9rem; border-radius: 8px; font-weight: 600; text-decoration: none; }
.salta:focus { top: 12px; }

/* ---------- barra della lingua (solo pagina iniziale italiana) ---------- */
.lingua-bar { position: relative; z-index: 2; background: var(--surface-2); border-bottom: 1px solid var(--line); text-align: center; font-size: .86rem; color: var(--text-2); padding: .5rem 16px; }
.lingua-bar strong { color: var(--text); }
.lingua-bar a { font-weight: 600; }

/* ---------- barra in alto ---------- */
.barra { position: sticky; top: 0; z-index: 20; background: var(--barra-bg); border-bottom: 1px solid var(--line); }   /* opaca: niente sfocatura dietro (costa a ogni fotogramma dello sfondo); senza sfocatura, con un po' di trasparenza si leggerebbe il testo che le passa sotto */
.barra-in { max-width: 76rem; margin: 0 auto; height: 60px; padding: 0 clamp(16px, 3vw, 28px); display: flex; align-items: center; gap: 20px; }
.marchio { display: inline-flex; align-items: center; gap: .7rem; color: var(--text); text-decoration: none; white-space: nowrap; }
.marchio:hover { color: var(--text); }
.marchio .glifo { width: 30px; height: 30px; border-radius: 9px; display: grid; place-items: center; background: linear-gradient(145deg, var(--surface-3), var(--surface)); border: 1px solid var(--accent-line); color: var(--accent); font: 600 1.05rem/1 var(--mono); box-shadow: 0 0 0 4px var(--accent-soft); }
.marchio b { font-weight: 600; font-size: 1rem; letter-spacing: -.01em; }
.marchio small { font: 500 .72rem/1 var(--mono); color: var(--text-3); letter-spacing: .02em; }
.marchio .nome { display: grid; gap: 3px; }
.barra nav { margin-left: auto; display: flex; align-items: center; gap: 4px; }
.barra nav a { color: var(--text-2); text-decoration: none; font-size: .92rem; font-weight: 500; padding: .45rem .7rem; border-radius: 8px; transition: color .15s, background .15s; }
.barra nav a:hover { color: var(--text); background: var(--surface-3); }
.barra nav a[aria-current] { color: var(--text); background: var(--accent-soft); }
.barra nav a.lingua { font-family: var(--mono); font-size: .8rem; letter-spacing: .04em; border: 1px solid var(--line-2); }
.theme { font: 500 .8rem/1 var(--mono); color: var(--text-2); background: var(--surface); border: 1px solid var(--line-2); border-radius: 8px; padding: .5rem .7rem; cursor: pointer; display: inline-flex; align-items: center; gap: .45rem; white-space: nowrap; transition: border-color .15s, color .15s; }
.theme:hover { color: var(--text); border-color: var(--line-3); }
#theme-toggle::before { content: ""; width: 12px; height: 12px; border-radius: 50%; background: linear-gradient(90deg, var(--text) 50%, transparent 50%); border: 1.5px solid var(--text-2); }
:root[data-theme="light"] #theme-toggle::before { background: var(--amber); border-color: var(--amber); }
:root[data-theme="dark"] #theme-toggle::before { background: transparent; box-shadow: inset -4px -1px 0 0 var(--text-2); border-color: transparent; }
.theme.solo-icona { width: 36px; padding: .5rem 0; justify-content: center; }
.theme .testo-btn { display: inline; }
.theme.solo-icona .testo-btn { display: none; }
.anim-btn::before { content: ""; width: 12px; height: 12px; border-radius: 50%; background: radial-gradient(circle, var(--c-prog1) 0 2.5px, transparent 3px); border: 1.5px solid var(--c-prog1); box-shadow: 0 0 6px rgba(63, 224, 204, .45); }
.anim-btn[aria-pressed="false"]::before { background: linear-gradient(135deg, transparent 45%, var(--text-3) 45% 55%, transparent 55%); border-color: var(--line-3); box-shadow: none; }
.oled-btn::before { content: ""; width: 12px; height: 12px; border-radius: 50%; background: #000; border: 1.5px solid var(--text-2); box-shadow: 0 0 0 2px var(--surface); }
.oled-btn[aria-pressed="true"] { color: var(--text); border-color: var(--accent-line); background: #000; }
.oled-btn[aria-pressed="true"]::before { border-color: #fff; box-shadow: 0 0 0 2px #000, 0 0 0 3.5px #fff; }
.menu-btn { display: none; margin-left: auto; width: 40px; height: 40px; border-radius: 10px; border: 1px solid var(--line-2); background: var(--surface); color: var(--text); cursor: pointer; place-items: center; }
.menu-btn span, .menu-btn span::before, .menu-btn span::after { display: block; width: 16px; height: 1.5px; background: currentColor; position: relative; transition: transform .25s var(--morbido), background .2s; }
.menu-btn span::before, .menu-btn span::after { content: ""; position: absolute; left: 0; }
.menu-btn span::before { top: -5px; } .menu-btn span::after { top: 5px; }
.menu-aperto .menu-btn span { background: transparent; }
.menu-aperto .menu-btn span::before { transform: translateY(5px) rotate(45deg); }
.menu-aperto .menu-btn span::after { transform: translateY(-5px) rotate(-45deg); }
.avanzamento { position: absolute; left: 0; bottom: -1px; height: 2px; width: 100%; transform-origin: 0 50%; transform: scaleX(var(--p, 0)); background: linear-gradient(90deg, var(--accent), var(--blue)); }
@media (max-width: 880px) {
  .menu-btn { display: grid; }
  .barra nav { position: fixed; left: 0; right: 0; top: 60px; flex-direction: column; align-items: stretch; gap: 2px; padding: 12px 16px 18px; background: var(--bg-2); border-bottom: 1px solid var(--line); box-shadow: var(--shadow-2); transform: translateY(-8px); opacity: 0; visibility: hidden; transition: opacity .2s, transform .25s var(--morbido), visibility .2s; }
  .menu-aperto .barra nav { transform: none; opacity: 1; visibility: visible; }
  .barra nav a { padding: .7rem .8rem; font-size: 1rem; }
  .barra nav .theme { justify-content: center; padding: .7rem; margin-top: 6px; }
  .barra nav .theme.solo-icona { width: auto; }
  .barra nav .theme.solo-icona .testo-btn { display: inline; }
}
@media (max-width: 420px) { .marchio small { display: none; } }

/* ---------- impaginazione ---------- */
.pagina { max-width: 76rem; margin: 0 auto; padding: 0 clamp(16px, 3vw, 28px); }
.sezione { padding: clamp(2.5rem, 6vw, 4.5rem) 0 0; }
.sezione > h2, .sez-testa h2 { font-size: clamp(1.45rem, 1.2rem + 1vw, 1.9rem); font-weight: 600; letter-spacing: -.02em; margin: 0; }
.sez-testa { display: flex; flex-wrap: wrap; align-items: baseline; justify-content: space-between; gap: .4rem 1.5rem; margin-bottom: 1.4rem; }
.sez-testa p { margin: 0; color: var(--text-2); max-width: 44rem; }
.etichetta { display: inline-flex; align-items: center; gap: .5rem; font: 500 .75rem/1.3 var(--mono); letter-spacing: .06em; text-transform: uppercase; color: var(--accent); }
.etichetta::before { content: ""; width: 18px; height: 1px; background: currentColor; }
.tenue { color: var(--text-3); }
.piccolo { font-size: .92rem; color: var(--text-2); }

/* ---------- pagina iniziale ---------- */
.apertura { padding: clamp(3rem, 9vw, 6.5rem) 0 clamp(2rem, 5vw, 3rem); display: grid; gap: clamp(2rem, 4vw, 3.5rem); grid-template-columns: minmax(0, 1fr); align-items: end; }
@media (min-width: 980px) { .apertura { grid-template-columns: minmax(0, 1.25fr) minmax(0, .75fr); } }
.apertura h1 { font-size: clamp(2.5rem, 1.6rem + 4vw, 4.4rem); font-weight: 600; letter-spacing: -.035em; line-height: 1.02; margin: 1rem 0 1.2rem; }
.apertura h1 em { font-style: normal; color: var(--accent); }
.apertura .intro { font-size: clamp(1.08rem, 1rem + .3vw, 1.22rem); color: var(--text-2); max-width: 40rem; margin: 0 0 1.2rem; }
.apertura .canali { font-size: .98rem; color: var(--text-2); max-width: 42rem; margin: 0; }
.apertura .canali + .canali { margin-top: .8rem; }
.badge { display: inline-flex; align-items: baseline; gap: .55rem; margin-top: 1.4rem; font: 500 .78rem/1.45 var(--mono); color: var(--text-2); padding: .5rem .8rem; border: 1px solid var(--line-2); border-radius: 10px; background: var(--surface); max-width: 100%; }
.badge i { flex: 0 0 auto; width: 7px; height: 7px; border-radius: 50%; background: var(--accent); box-shadow: 0 0 0 4px var(--accent-soft); transform: translateY(-1px); }
.pannello { background: color-mix(in srgb, var(--surface) 96%, transparent); border: 1px solid var(--line); border-radius: var(--raggio); box-shadow: var(--shadow); }
.prossimi { padding: 1.1rem 1.2rem .6rem; }
.prossimi h2 { font: 500 .75rem/1.3 var(--mono); letter-spacing: .06em; text-transform: uppercase; color: var(--text-3); margin: 0 0 .6rem; }
.prossimi ol { list-style: none; margin: 0; padding: 0; }
.prossimi li { display: grid; grid-template-columns: auto minmax(0, 1fr); gap: .15rem .9rem; padding: .7rem 0; border-top: 1px solid var(--line); margin: 0; }
.prossimi li:first-child { border-top: 0; }
.prossimi .quando { font: 600 .82rem/1.5 var(--mono); color: var(--amber); white-space: nowrap; grid-row: span 2; padding-top: .1rem; }
.prossimi .cosa { font-weight: 600; color: var(--text); font-size: .98rem; line-height: 1.35; }
.prossimi .dett { font-size: .85rem; color: var(--text-3); line-height: 1.4; }
.prossimi .fonte { font-size: .78rem; color: var(--text-3); margin: .5rem 0 .5rem; }

.avviso { display: grid; grid-template-columns: auto minmax(0, 1fr); gap: 1rem; padding: 1.2rem 1.3rem; border: 1px solid color-mix(in srgb, var(--amber) 35%, var(--line)); border-radius: var(--raggio); background: linear-gradient(135deg, var(--amber-soft), transparent 60%), var(--surface); }
.avviso .segno { width: 34px; height: 34px; border-radius: 10px; display: grid; place-items: center; background: var(--amber-soft); color: var(--amber); font: 600 1.1rem/1 var(--mono); border: 1px solid color-mix(in srgb, var(--amber) 40%, transparent); }
.avviso h2 { font-size: 1.05rem; margin: .2rem 0 .5rem; font-weight: 600; }
.avviso ul { margin: 0 0 .6rem; padding-left: 1.1em; color: var(--text-2); font-size: .97rem; }
.avviso li { margin: .35rem 0; }
.avviso p { margin: 0; font-size: .95rem; }
@media (max-width: 560px) { .avviso { grid-template-columns: minmax(0, 1fr); gap: .6rem; } }

.griglia-corsi { display: grid; gap: 14px; grid-template-columns: repeat(auto-fill, minmax(min(100%, 19rem), 1fr)); }
.corso { position: relative; display: flex; flex-direction: column; gap: .7rem; padding: 1.25rem 1.3rem 1.1rem; border-radius: var(--raggio); background: var(--surface); border: 1px solid var(--line); box-shadow: var(--shadow); text-decoration: none; color: var(--text); overflow: hidden; transition: transform .35s var(--morbido), border-color .25s, box-shadow .35s; }
.corso::before { content: ""; position: absolute; left: 0; top: 0; right: 0; height: 3px; background: linear-gradient(90deg, var(--c), transparent 85%); opacity: .9; }
.corso::after { content: ""; position: absolute; inset: 0; background: radial-gradient(420px circle at var(--mx, 50%) var(--my, 0%), color-mix(in srgb, var(--c) 10%, transparent), transparent 55%); opacity: 0; transition: opacity .3s; pointer-events: none; }
.corso:hover { transform: translateY(-3px); border-color: color-mix(in srgb, var(--c) 45%, var(--line)); box-shadow: var(--shadow-2); color: var(--text); }
.corso:hover::after { opacity: 1; }
.corso .riga { display: flex; flex-wrap: wrap; align-items: center; gap: .4rem; }
.chip { display: inline-flex; align-items: center; gap: .35rem; font: 500 .74rem/1 var(--mono); letter-spacing: .02em; padding: .38rem .55rem; border-radius: 7px; border: 1px solid var(--line-2); color: var(--text-2); background: var(--surface-2); white-space: nowrap; }
.chip.c { color: var(--c, var(--accent)); border-color: color-mix(in srgb, var(--c, var(--accent)) 40%, var(--line)); background: color-mix(in srgb, var(--c, var(--accent)) 8%, transparent); }
.corso h3 { font-size: 1.22rem; font-weight: 600; letter-spacing: -.015em; margin: .1rem 0 0; }
.corso .esame { font-size: .93rem; color: var(--text-2); margin: 0; line-height: 1.5; }
.corso .date { font: 500 .8rem/1.45 var(--mono); color: var(--amber); margin: 0; }
.corso .piede-card { margin-top: auto; padding-top: .8rem; border-top: 1px solid var(--line); display: flex; align-items: center; justify-content: space-between; gap: 1rem; font-size: .86rem; color: var(--text-3); }
.corso .apri { font: 500 .8rem/1 var(--mono); color: var(--c); transition: transform .3s var(--morbido); }
.corso:hover .apri { transform: translateX(4px); }
.corso .nota-canale { font-size: .82rem; color: var(--amber); }
.griglia-corsi.compatta .corso { padding: 1.05rem 1.15rem 1rem; gap: .55rem; }
.griglia-corsi.compatta .corso h3 { font-size: 1.08rem; }

.ultime { margin-top: 2rem; }
.ultime h3 { font: 500 .75rem/1.3 var(--mono); letter-spacing: .06em; text-transform: uppercase; color: var(--text-3); margin: 0 0 .7rem; }
.flusso { list-style: none; margin: 0; padding: 0; border-left: 1px solid var(--line-2); }
.flusso li { position: relative; margin: 0; padding: .55rem 0 .55rem 1.3rem; display: flex; flex-wrap: wrap; align-items: baseline; gap: .2rem .9rem; }
.flusso li::before { content: ""; position: absolute; left: -5px; top: 1.05rem; width: 9px; height: 9px; border-radius: 50%; background: var(--bg); border: 2px solid var(--c, var(--accent)); }
.flusso time { font: 500 .8rem/1.4 var(--mono); color: var(--text-3); min-width: 6.2rem; }
.flusso a { font-weight: 600; text-decoration: none; color: var(--text); }
.flusso a:hover { color: var(--accent); }
.flusso .di { font-size: .88rem; color: var(--text-3); }

.info-griglia { display: grid; gap: 14px; grid-template-columns: repeat(auto-fit, minmax(min(100%, 22rem), 1fr)); }
.info { padding: 1.3rem 1.35rem 1.1rem; }
.info h2 { font-size: 1.12rem; font-weight: 600; margin: 0 0 .6rem; letter-spacing: -.01em; }
.info p, .info li { font-size: .97rem; color: var(--text-2); }
.info ul { padding-left: 1.1em; margin-bottom: .4rem; }
.info .num { font: 600 .78rem/1 var(--mono); color: var(--accent); display: block; margin-bottom: .7rem; }

/* blocco finale verso la guida OFA */
.ofa { position: relative; margin: clamp(2.5rem, 6vw, 4.5rem) 0 0; border-radius: calc(var(--raggio) + 4px); overflow: hidden; border: 1px solid var(--line-2); background: radial-gradient(900px 300px at 100% 0%, rgba(215, 38, 63, .16), transparent 60%), linear-gradient(180deg, #05070c, #000); color: #f2efe8; }
.ofa-in { position: relative; display: grid; gap: 1.5rem 3rem; padding: clamp(1.6rem, 4vw, 2.6rem); grid-template-columns: minmax(0, 1fr); align-items: center; }
@media (min-width: 900px) { .ofa-in { grid-template-columns: minmax(0, 1.4fr) auto; } }
.ofa .etichetta { color: #ff7384; }
.ofa h2 { color: #fbfaf6; font-size: clamp(1.5rem, 1.2rem + 1.2vw, 2.1rem); font-weight: 600; letter-spacing: -.02em; margin: .7rem 0 .8rem; }
.ofa p { color: #c9c5bd; margin: 0 0 .6rem; max-width: 44rem; }
.ofa p strong { color: #fbfaf6; }
.ofa .vai { display: inline-flex; align-items: center; gap: .6rem; padding: .85rem 1.2rem; border-radius: 10px; background: #fbfaf6; color: #0a0a0a; font-weight: 600; text-decoration: none; white-space: nowrap; transition: transform .3s var(--morbido), box-shadow .3s; box-shadow: 0 10px 30px -12px rgba(215, 38, 63, .6); }
.ofa .vai:hover { transform: translateY(-2px); color: #000; }
.ofa .vai span { color: #d7263f; transition: transform .3s var(--morbido); }
.ofa .vai:hover span { transform: translateX(3px); }
.ofa .stelline { position: absolute; inset: 0; pointer-events: none; background-image: radial-gradient(1px 1px at 12% 30%, rgba(255,255,255,.7), transparent), radial-gradient(1px 1px at 72% 18%, rgba(255,255,255,.5), transparent), radial-gradient(1.5px 1.5px at 88% 70%, rgba(255,255,255,.6), transparent), radial-gradient(1px 1px at 40% 80%, rgba(255,255,255,.4), transparent), radial-gradient(1px 1px at 56% 40%, rgba(255,255,255,.35), transparent), radial-gradient(1px 1px at 25% 62%, rgba(255,255,255,.3), transparent); opacity: .8; }

/* ---------- pagina di un corso ---------- */
.testata { padding: clamp(2.2rem, 6vw, 4rem) 0 1.6rem; max-width: 52rem; }
.briciole { display: flex; flex-wrap: wrap; align-items: center; gap: .45rem; font: 500 .8rem/1.4 var(--mono); color: var(--text-3); margin: 0 0 1.4rem; }
.briciole a { color: var(--text-2); text-decoration: none; }
.briciole a:hover { color: var(--accent); }
.briciole .sep { color: var(--line-3); }
.testata h1 { font-size: clamp(2.1rem, 1.5rem + 2.6vw, 3.2rem); font-weight: 600; letter-spacing: -.03em; line-height: 1.06; margin: .8rem 0 1rem; }
.testata .intro { font-size: 1.08rem; color: var(--text-2); margin: 0; }
.nome-it { font: 500 .82rem/1.4 var(--mono); color: var(--text-3); }
.testata .nome-it { margin: -.3rem 0 1rem; }
.corso .nome-it { margin: -.45rem 0 0; }
.scheda { display: grid; gap: 12px; grid-template-columns: minmax(0, 1fr); margin: 0; }
@media (min-width: 700px) { .scheda { grid-template-columns: repeat(2, minmax(0, 1fr)); } .scheda .dato:first-child { grid-column: 1 / -1; } }
@media (min-width: 1000px) { .scheda.n4 { grid-template-columns: 2.2fr 1.5fr .7fr .7fr; } .scheda.n3 { grid-template-columns: 2.2fr .7fr .7fr; } .scheda .dato:first-child { grid-column: auto; } }
.dato { padding: 1rem 1.1rem; border-radius: var(--raggio-2); background: var(--surface); border: 1px solid var(--line); }
.dato dt { font: 500 .72rem/1.3 var(--mono); letter-spacing: .06em; text-transform: uppercase; color: var(--text-3); margin: 0 0 .45rem; }
.dato dd { margin: 0; font-size: .97rem; color: var(--text); line-height: 1.5; }
.dato dd.grande { font: 600 1.5rem/1.1 var(--mono); color: var(--c, var(--accent)); }
.nota { margin: 1.4rem 0 0; padding: 1rem 1.2rem; border-radius: var(--raggio-2); border: 1px solid color-mix(in srgb, var(--amber) 35%, var(--line)); background: var(--amber-soft); font-size: .97rem; color: var(--text-2); }
.nota strong { color: var(--amber); }
.lezioni { list-style: none; margin: 0; padding: 0; position: relative; }
.lezioni::before { content: ""; position: absolute; left: 21px; top: 8px; bottom: 8px; width: 1px; background: linear-gradient(var(--line-3), var(--line) 80%, transparent); }
.lezioni li { position: relative; margin: 0 0 10px; padding-left: 58px; }
.lezioni .nodo { position: absolute; left: 4px; top: 50%; transform: translateY(-50%); width: 35px; height: 35px; border-radius: 11px; display: grid; place-items: center; background: var(--surface); border: 1px solid var(--line-2); font: 600 .72rem/1 var(--mono); color: var(--c, var(--accent)); }
.lezioni a { display: flex; flex-wrap: wrap; align-items: baseline; gap: .3rem 1rem; padding: 1rem 1.2rem; border-radius: var(--raggio-2); background: var(--surface); border: 1px solid var(--line); text-decoration: none; color: var(--text); transition: border-color .2s, transform .3s var(--morbido), background .2s; }
.lezioni a:hover { border-color: color-mix(in srgb, var(--c, var(--accent)) 45%, var(--line)); transform: translateX(3px); color: var(--text); }
.lezioni .tit { font-weight: 600; font-size: 1.05rem; }
.lezioni time { margin-left: auto; font: 500 .8rem/1 var(--mono); color: var(--text-3); }
.vuoto { padding: 1.2rem 1.3rem; border: 1px dashed var(--line-2); border-radius: var(--raggio-2); color: var(--text-3); font-size: .97rem; margin: 0; }
.modulo-titolo { font: 500 .78rem/1.3 var(--mono); letter-spacing: .06em; text-transform: uppercase; color: var(--text-3); margin: 1.6rem 0 .8rem; }
.link-lista { display: grid; gap: 10px; grid-template-columns: repeat(auto-fit, minmax(min(100%, 18rem), 1fr)); list-style: none; padding: 0; margin: 0; }
.link-lista li { margin: 0; }
.link-lista a { display: flex; align-items: center; justify-content: space-between; gap: 1rem; padding: .95rem 1.1rem; border-radius: var(--raggio-2); background: var(--surface); border: 1px solid var(--line); text-decoration: none; color: var(--text); font-weight: 500; transition: border-color .2s; }
.link-lista a::after { content: "↗"; font-family: var(--mono); color: var(--accent); }
.link-lista a:hover { border-color: var(--accent-line); color: var(--text); }
.link-lista .manca { display: flex; align-items: center; padding: .95rem 1.1rem; border-radius: var(--raggio-2); border: 1px dashed var(--line-2); color: var(--text-3); font-weight: 500; }   /* pagina che non esiste ancora */

/* ---------- piede ---------- */
.piede { margin-top: clamp(3.5rem, 8vw, 6rem); border-top: 1px solid var(--line); background: color-mix(in srgb, var(--bg-2) 92%, transparent); }
.piede-in { max-width: 76rem; margin: 0 auto; padding: 2.4rem clamp(16px, 3vw, 28px) 1.4rem; display: grid; gap: 2rem; grid-template-columns: minmax(0, 1fr); }
@media (min-width: 860px) { .piede-in { grid-template-columns: minmax(0, 1.6fr) minmax(0, 1fr) minmax(0, 1fr); } }
.piede h2 { font: 500 .74rem/1.3 var(--mono); letter-spacing: .07em; text-transform: uppercase; color: var(--text-3); margin: 0 0 .8rem; }
.piede p { font-size: .9rem; color: var(--text-2); margin: 0 0 .6rem; }
.piede ul { list-style: none; padding: 0; margin: 0; }
.piede li { margin: .35rem 0; font-size: .92rem; }
.piede a { color: var(--text-2); text-decoration: none; }
.piede a:hover { color: var(--accent); }
.piede-fondo { grid-column: 1 / -1; display: flex; flex-wrap: wrap; align-items: center; justify-content: space-between; gap: .8rem 1.5rem; padding-top: 1.2rem; border-top: 1px solid var(--line); font: 500 .78rem/1.5 var(--mono); color: var(--text-3); }
.interruttore { font: 500 .78rem/1 var(--mono); color: var(--text-2); background: none; border: 0; cursor: pointer; display: inline-flex; align-items: center; gap: .55rem; padding: .3rem 0; }
.interruttore .pista { width: 30px; height: 17px; border-radius: 99px; background: var(--accent-soft); border: 1px solid var(--accent-line); position: relative; transition: background .2s; }
.interruttore .pista::after { content: ""; position: absolute; top: 2px; left: 15px; width: 11px; height: 11px; border-radius: 50%; background: var(--accent); transition: left .25s var(--morbido), background .2s; }
.meno-moto .interruttore .pista { background: var(--surface-3); border-color: var(--line-2); }
.meno-moto .interruttore .pista::after { left: 2px; background: var(--text-3); }

/* ---------- comparsa (solo pagine iniziale e dei corsi) ---------- */
.rivela { opacity: 0; transform: translateY(14px); clip-path: inset(0 0 12% 0); transition: opacity .7s var(--morbido), transform .8s var(--morbido), clip-path .9s var(--morbido); transition-delay: calc(var(--i, 0) * 70ms); }
.rivela.visto { opacity: 1; transform: none; clip-path: inset(0 0 0 0); }
.meno-moto .rivela { opacity: 1; transform: none; clip-path: none; transition: none; }
.meno-moto .corso, .meno-moto .lezioni a { transition: none; }
.meno-moto html, html.meno-moto { scroll-behavior: auto; }

/* ---------- passaggio tra le pagine ---------- */
/* dissolvenza breve invece dello stacco (nei browser che la supportano); lo sfondo intanto continua da dove era (rete.js)
   e ciò che la pagina nuova ha già sullo schermo compare subito, senza entrata */
@view-transition { navigation: auto; }
html:active-view-transition .rivela { opacity: 1; transform: none; clip-path: none; transition: none; }
html.arrivo:not(.pronto) .rivela { opacity: 1; transform: none; clip-path: none; transition: none; }   /* finché appunti.js non decide */
html.meno-moto::view-transition-group(*), html.meno-moto::view-transition-old(*), html.meno-moto::view-transition-new(*) { animation: none; }
@media print { .sfondo, #rete, .barra, .piede { display: none !important; } body { background: #fff; color: #000; } .rivela { opacity: 1; transform: none; clip-path: none; } }

/* ======================================================================
   LEZIONI
   ====================================================================== */
.shell { max-width: 76rem; margin: 0 auto; padding: clamp(1.4rem, 4vw, 2.6rem) clamp(16px, 3vw, 28px) 0; display: grid; grid-template-columns: minmax(0, 1fr); gap: 22px; position: relative; z-index: 1; }
@media (min-width: 1080px) { .shell { grid-template-columns: 15.5rem minmax(0, 1fr); gap: 32px; } }
.shell > main { min-width: 0; will-change: transform; }
.foglio { background: color-mix(in srgb, var(--surface) 94%, transparent); border: 1px solid var(--line); border-radius: calc(var(--raggio) + 4px); box-shadow: var(--shadow); padding: clamp(1.3rem, 4vw, 3rem) clamp(1.1rem, 4.5vw, 3.4rem) clamp(1.6rem, 4vw, 3rem); max-width: 52rem; }

/* indice */
.toc { font-size: .9rem; line-height: 1.4; }
.toc summary { font: 500 .74rem/1.3 var(--mono); letter-spacing: .07em; text-transform: uppercase; color: var(--text-3); cursor: pointer; padding: .3rem 0; list-style: none; display: flex; align-items: center; justify-content: space-between; }
.toc summary::-webkit-details-marker { display: none; }
.toc summary::after { content: "+"; font-size: 1rem; color: var(--accent); }
.toc details[open] summary::after { content: "−"; }
.toc ol { list-style: none; margin: .6rem 0 0; padding: 0; position: relative; }
.toc ol::before { content: ""; position: absolute; left: 0; top: 0; bottom: 0; width: 2px; border-radius: 2px; background: var(--line); }
.toc ol::after { content: ""; position: absolute; left: 0; top: 0; width: 2px; height: calc(var(--letto, 0) * 100%); border-radius: 2px; background: linear-gradient(var(--accent), var(--blue)); transition: height .2s linear; }
/* barra della lettura e indice riempiti dallo scorrimento stesso, senza script (appunti.js lo fa solo nei browser che non
   lo sanno fare): l'indice segue il foglio, da quando il suo bordo alto passa al 35% dello schermo a quando ci passa quello basso */
@supports (animation-timeline: scroll()) {
  .avanzamento { animation: avanzamento linear both; animation-timeline: scroll(root block); }
}
/* l'indice sta fuori dal foglio: serve anche timeline-scope (senza, la linea resterebbe piena); le stesse condizioni in appunti.js */
@supports (animation-timeline: scroll()) and (timeline-scope: none) and (view-timeline-inset: 35% 65%) {
  .shell { timeline-scope: --foglio; }
  .foglio { view-timeline: --foglio block; view-timeline-inset: 35% 65%; }
  .toc ol::after { height: 100%; transform-origin: 0 0; transition: none; animation: letto linear both; animation-timeline: --foglio; }
}
@keyframes avanzamento { from { transform: scaleX(0); } to { transform: scaleX(1); } }
@keyframes letto { from { transform: scaleY(0); } to { transform: scaleY(1); } }
.toc li { margin: 0; }
.toc a { display: flex; gap: .6rem; padding: .36rem .5rem .36rem .9rem; color: var(--text-2); text-decoration: none; border-radius: 0 8px 8px 0; transition: color .15s, background .15s; }
.toc a .n { font: 500 .74rem/1.5 var(--mono); color: var(--text-3); min-width: 2.2em; }
.toc a:hover { color: var(--text); background: var(--surface-3); }
.toc a.is-active { color: var(--text); background: var(--accent-soft); font-weight: 500; }
.toc a.is-active .n { color: var(--accent); }
@media (min-width: 1080px) { .toc { position: sticky; top: 84px; align-self: start; max-height: calc(100vh - 104px); overflow: auto; padding: .2rem .3rem 1rem 0; scrollbar-width: thin; } }
@media (max-width: 1079px) { .toc { background: var(--surface); border: 1px solid var(--line); border-radius: var(--raggio-2); padding: .7rem 1rem; } }

/* intestazione della lezione */
.crumbs { display: flex; flex-wrap: wrap; align-items: center; gap: .4rem; font: 500 .8rem/1.4 var(--mono); color: var(--text-3); margin: 0 0 1.4rem; }
.crumbs a { color: var(--text-2); text-decoration: none; }
.crumbs a:hover { color: var(--accent); }
.eyebrow { font: 500 .78rem/1.4 var(--mono); letter-spacing: .04em; color: var(--accent); margin: 0 0 .6rem; }
.foglio h1 { font-size: clamp(2rem, 1.5rem + 2.2vw, 2.9rem); font-weight: 600; letter-spacing: -.03em; line-height: 1.06; margin: 0; }
.lede { font-size: clamp(1.06rem, 1rem + .25vw, 1.18rem); line-height: 1.6; color: var(--text-2); margin: 1rem 0 0; }
.meta { display: flex; flex-wrap: wrap; gap: 8px; margin: 1.3rem 0 0; padding: 0; }
.meta div { display: flex; flex-direction: column; gap: 2px; padding: .55rem .8rem; border-radius: 9px; background: var(--surface-2); border: 1px solid var(--line); }
.meta dt { font: 500 .68rem/1.3 var(--mono); letter-spacing: .06em; text-transform: uppercase; color: var(--text-3); }
.meta dd { margin: 0; font-size: .9rem; color: var(--text); }
.legend { display: flex; flex-wrap: wrap; gap: 6px 16px; margin: 1rem 0 0; padding: 0; list-style: none; font-size: .84rem; color: var(--text-2); }
.legend li { display: flex; gap: 7px; align-items: center; margin: 0; }
.legend i { width: 10px; height: 10px; display: inline-block; border-radius: 3px; }
.legend .l-def i { background: var(--blue); } .legend .l-trap i { background: var(--rose); } .legend .l-exam i { background: var(--amber); } .legend .l-extra i { border: 1.5px dashed var(--violet); }

/* sezioni */
.foglio section { margin-top: clamp(2.6rem, 6vw, 3.8rem); scroll-margin-top: 84px; }
/* le sezioni lontane dallo schermo non si impaginano né si disegnano finché non servono (pagine con decine di migliaia di
   elementi delle formule): intanto contano dell'altezza stimata dal generatore (--h), poi di quella vera. Il contenimento
   tiene dentro la sezione i margini finali, che prima si fondevano con lo spazio tra le sezioni: si azzerano, così gli
   spazi restano quelli di prima. Indice, àncore, ricerca nella pagina e stampa le aprono comunque. Solo le sezioni con
   l'altezza stimata (lezioni generate dal Markdown): nelle lezioni scritte a mano una stima a caso farebbe arrivare
   l'indice nel punto sbagliato */
.foglio > section[style*="--h:"] { content-visibility: auto; contain-intrinsic-size: auto var(--h); }
@media (max-width: 640px) { .foglio > section[style*="--h:"] { contain-intrinsic-size: auto calc(var(--h) * 2); } }
.foglio > section[style*="--h:"] > :last-child, .foglio > section[style*="--h:"] > :is(ul, ol):last-child > li:last-child,
.foglio > section[style*="--h:"] > :is(ul, ol):last-child > li:last-child > :last-child { margin-bottom: 0; }
@media print { .foglio > section { content-visibility: visible; } }
.sec-head { display: flex; flex-wrap: wrap; align-items: center; gap: .5rem .8rem; margin-bottom: 1.1rem; padding-bottom: .9rem; border-bottom: 1px solid var(--line); }
.sec-num { font: 600 .78rem/1 var(--mono); color: var(--accent); padding: .38rem .5rem; border-radius: 7px; background: var(--accent-soft); border: 1px solid var(--accent-line); }
.foglio h2 { font-size: clamp(1.35rem, 1.2rem + .7vw, 1.7rem); font-weight: 600; letter-spacing: -.02em; margin: 0; }
.slides { margin-left: auto; font: 500 .74rem/1 var(--mono); color: var(--text-3); padding: .36rem .55rem; border: 1px solid var(--line-2); border-radius: 7px; white-space: nowrap; }
.foglio h3 { font-size: 1.12rem; font-weight: 600; letter-spacing: -.01em; margin: 1.8rem 0 .5rem; }
.foglio p, .foglio ul, .foglio ol { margin: .8rem 0; }
.tldr { margin-top: 2rem !important; padding: 1.2rem 1.4rem; border-radius: var(--raggio); background: linear-gradient(135deg, var(--accent-soft), transparent 55%), var(--surface-2); border: 1px solid var(--accent-line); }
.tldr h2 { font: 500 .78rem/1.3 var(--mono) !important; letter-spacing: .06em !important; text-transform: uppercase; color: var(--accent) !important; margin: 0 0 .4rem !important; }
.tldr ul { margin: 0 !important; padding-left: 1.1em; }
.tldr li { margin: .5rem 0; }
.tldr li::marker { color: var(--accent); }

/* riquadri */
.box { position: relative; padding: .95rem 1.15rem; margin: 1.3rem 0; border-radius: var(--raggio-2); border: 1px solid var(--line); background: var(--surface-2); }
.box > :first-child { margin-top: 0; } .box > :last-child { margin-bottom: 0; }
.box-label { display: inline-flex; align-items: center; gap: .45rem; font: 600 .72rem/1.3 var(--mono); letter-spacing: .06em; text-transform: uppercase; margin: 0 0 .5rem !important; color: var(--text-3); }
.box-label::before { content: ""; width: 8px; height: 8px; border-radius: 2px; background: currentColor; }
.def { background: linear-gradient(180deg, var(--blue-soft), transparent 70%), var(--surface-2); border-color: color-mix(in srgb, var(--blue) 35%, var(--line)); }
.def .box-label { color: var(--blue); }
.trap { background: linear-gradient(180deg, var(--rose-soft), transparent 70%), var(--surface-2); border-color: color-mix(in srgb, var(--rose) 35%, var(--line)); }
.trap .box-label { color: var(--rose); }
.exam { background: linear-gradient(180deg, var(--amber-soft), transparent 70%), var(--surface-2); border-color: color-mix(in srgb, var(--amber) 38%, var(--line)); }
.exam .box-label { color: var(--amber); }
.extra { background: var(--violet-soft); border: 1px dashed color-mix(in srgb, var(--violet) 55%, var(--line)); }
.extra .box-label { color: var(--violet); }
.extra .box-label::before { background: none; border: 1.5px dashed currentColor; }
.def-text { font-size: 1.08rem; line-height: 1.6; margin: 0; color: var(--text); }
.principle { margin: 1.8rem 0; padding: 1.3rem 1.4rem; border-radius: var(--raggio); border: 1px solid var(--accent-line); background: radial-gradient(500px 160px at 0% 0%, var(--accent-soft), transparent 70%), var(--surface-2); }
.principle .box-label { color: var(--accent); }
.principle p.big { font-weight: 600; font-size: clamp(1.2rem, 1.05rem + .8vw, 1.55rem); letter-spacing: -.015em; line-height: 1.3; margin: 0; color: var(--text); text-wrap: balance; }
.principle p.small { font-size: .97rem; color: var(--text-2); margin: .6rem 0 0; }
blockquote.quote { margin: 1.8rem 0; padding: .2rem 0 .2rem 1.4rem; border-left: 2px solid var(--accent); }
blockquote.quote p { font-style: italic; font-size: clamp(1.15rem, 1.05rem + .5vw, 1.4rem); line-height: 1.45; margin: 0; color: var(--text); }
blockquote.quote p::before { content: "«"; margin-right: .08em; color: var(--accent); }
blockquote.quote p::after { content: "»"; margin-left: .08em; color: var(--accent); }
html[lang="en"] blockquote.quote p::before { content: "“"; } html[lang="en"] blockquote.quote p::after { content: "”"; }
blockquote.quote footer { font: 500 .8rem/1.5 var(--mono); color: var(--text-3); margin-top: .7rem; }

/* codice e tabelle */
pre.code { position: relative; background: var(--code-bg); border: 1px solid var(--line); border-left: 2px solid var(--accent-line); border-radius: var(--raggio-2); padding: 1rem 1.1rem; overflow-x: auto; white-space: pre-wrap; font-size: .86rem; line-height: 1.65; margin: 1rem 0; color: var(--text); }
pre.code code { background: none; border: 0; padding: 0; font-size: inherit; color: inherit; }
.kw { color: var(--accent); font-weight: 600; }
.cm { color: var(--text-3); font-style: italic; }
.bad-line { color: var(--rose); font-weight: 600; }
.mark { background: color-mix(in srgb, var(--amber) 22%, transparent); padding: 0 .12em; border-radius: 3px; }
.table-wrap { overflow-x: auto; margin: 1.1rem 0; border: 1px solid var(--line); border-radius: var(--raggio-2); background: var(--surface-2); }
table { border-collapse: collapse; width: 100%; font-size: .93rem; line-height: 1.5; }
th, td { padding: .6rem .8rem; text-align: left; vertical-align: top; border-bottom: 1px solid var(--line); }
th { font: 500 .72rem/1.35 var(--mono); letter-spacing: .05em; text-transform: uppercase; color: var(--text-3); background: var(--surface-3); vertical-align: bottom; }
tr:last-child td { border-bottom: 0; }
td.num, th.num { text-align: right; font-variant-numeric: tabular-nums; font-family: var(--mono); }
td.mono { font-size: .86rem; white-space: nowrap; }
tr.row-bad td { background: var(--rose-soft); }
tr.row-ok td { background: var(--green-soft); }

.spec { display: grid; grid-template-columns: repeat(auto-fit, minmax(170px, 1fr)); gap: 10px; margin: 1.2rem 0; }
.spec div { border: 1px solid var(--line); background: var(--surface-2); border-radius: var(--raggio-2); padding: .8rem .95rem; font-size: .96rem; }
.spec b { display: block; font: 600 .72rem/1.3 var(--mono); letter-spacing: .06em; text-transform: uppercase; color: var(--accent); margin-bottom: .3rem; }
.paper { background-color: var(--surface-2); background-image: linear-gradient(var(--grid) 1px, transparent 1px), linear-gradient(90deg, var(--grid) 1px, transparent 1px); background-size: 22px 22px; border: 1px solid var(--line); border-radius: var(--raggio-2); padding: 1rem 1.2rem; margin: 1.2rem 0; display: flex; flex-wrap: wrap; gap: 20px 44px; align-items: flex-start; }
.colsum { font: 1rem/1.6 var(--mono); margin: 0; white-space: pre; color: var(--text); }
.colsum .note { color: var(--text-3); font: .85rem var(--sans); }
.colsum .tot { color: var(--accent); font-weight: 600; }
.paper table { width: auto; background: transparent; }
.paper th { background: transparent; }
.tally { font-family: var(--mono); letter-spacing: .12em; color: var(--accent); font-weight: 600; }
figure { margin: 0; }
figcaption { font-size: .86rem; color: var(--text-3); margin-top: .6rem; }

/* versioni */
.versions { display: grid; grid-template-columns: minmax(0, 1fr); gap: 12px; margin-top: 1.2rem; }
.ver { border: 1px solid var(--line); border-radius: var(--raggio-2); padding: .9rem 1.1rem; background: var(--surface-2); }
.ver.bad { border-color: color-mix(in srgb, var(--rose) 40%, var(--line)); background: linear-gradient(180deg, var(--rose-soft), transparent 50%), var(--surface-2); }
.ver.final { border-color: var(--accent-line); background: linear-gradient(180deg, var(--accent-soft), transparent 50%), var(--surface-2); }
.ver-head { display: flex; flex-wrap: wrap; align-items: center; gap: .3rem .7rem; }
.ver-tag { font: 600 .78rem/1 var(--mono); color: var(--accent); padding: .3rem .45rem; border-radius: 6px; border: 1px solid var(--accent-line); }
.ver.bad .ver-tag { color: var(--rose); border-color: color-mix(in srgb, var(--rose) 45%, transparent); }
.ver-title { font-weight: 600; }
.ver-slide { margin-left: auto; font: 500 .74rem/1 var(--mono); color: var(--text-3); }
.ver pre.code { margin: .7rem 0; }
.ver-why { font-size: .96rem; color: var(--text-2); margin: 0; }

/* simulatore e diagramma di flusso */
.sim { border: 1px solid var(--line-2); border-radius: var(--raggio); background: linear-gradient(180deg, var(--surface-3), var(--surface-2) 140px); padding: 1.1rem; display: grid; gap: 1rem; margin-top: 1.5rem; box-shadow: var(--shadow); }
.sim-title { display: flex; flex-wrap: wrap; gap: .2rem .8rem; align-items: baseline; }
.sim-title h3 { margin: 0 !important; font-size: 1.1rem; }
.sim-title span { font-size: .88rem; color: var(--text-3); }
.sim-controls { display: flex; flex-wrap: wrap; gap: 12px 18px; align-items: flex-end; }
.field { display: grid; gap: 5px; }
.field label, .field .lab { font: 500 .72rem/1.3 var(--mono); letter-spacing: .05em; text-transform: uppercase; color: var(--text-3); }
.field input[type=number] { width: 6rem; font: 600 1rem var(--mono); padding: .45rem .6rem; border: 1px solid var(--line-2); border-radius: 8px; background: var(--code-bg); color: var(--text); }
.field input[type=number]:focus { border-color: var(--accent); outline: none; box-shadow: 0 0 0 3px var(--accent-soft); }
.seg { display: inline-flex; flex-wrap: wrap; border: 1px solid var(--line-2); border-radius: 9px; overflow: hidden; background: var(--code-bg); padding: 3px; gap: 3px; }
.seg input { position: absolute; opacity: 0; width: 1px; height: 1px; }
.field .seg label { padding: .4rem .75rem; cursor: pointer; font: 500 .82rem/1.3 var(--sans); letter-spacing: 0; text-transform: none; color: var(--text-2); border-radius: 6px; transition: background .15s, color .15s; }
.seg input:checked + label { background: var(--accent); color: var(--accent-ink); }
.seg input:focus-visible + label { outline: 2px solid var(--accent); outline-offset: 1px; }
.presets { display: flex; flex-wrap: wrap; gap: 6px; align-items: center; }
.presets .lab { font-size: .86rem; color: var(--text-3); }
button.chip, .presets .chip { cursor: pointer; font: 500 .78rem/1 var(--mono); padding: .45rem .6rem; }
button.chip:hover { border-color: var(--accent-line); color: var(--text); }
.chip.warn { color: var(--rose); border-color: color-mix(in srgb, var(--rose) 45%, var(--line)); }
.btns { display: flex; flex-wrap: wrap; gap: 8px; }
.btn { font: 600 .9rem var(--sans); padding: .55rem 1rem; border-radius: 9px; border: 1px solid var(--line-2); background: var(--surface); color: var(--text); cursor: pointer; transition: border-color .15s, background .15s, transform .2s var(--morbido); }
.btn:hover { border-color: var(--line-3); }
.btn:active { transform: translateY(1px); }
.btn.primary { background: var(--accent); border-color: var(--accent); color: var(--accent-ink); }
.btn.primary:hover { filter: brightness(1.08); }
.sim-grid { display: grid; gap: 1rem; grid-template-columns: minmax(0, 1fr); }
@media (min-width: 760px) { .sim-grid { grid-template-columns: minmax(0, 1.15fr) minmax(0, .85fr); align-items: start; } }
ol.prog { list-style: none; margin: 0; padding: .4rem 0; background: var(--code-bg); border: 1px solid var(--line); border-radius: var(--raggio-2); font: .84rem/1.55 var(--mono); overflow-x: auto; }
ol.prog li { display: flex; margin: 0; padding: .2rem .8rem .2rem 0; border-left: 3px solid transparent; transition: background .2s; }
ol.prog .ln { flex: 0 0 3.1em; text-align: right; padding-right: .7em; color: var(--text-3); }
ol.prog .tx { padding-left: calc(var(--ind, 0) * 1.35em); }
ol.prog li.is-current { background: var(--accent-soft); border-left-color: var(--accent); }
ol.prog li.is-last { background: var(--amber-soft); border-left-color: var(--amber); }
.vars { display: flex; flex-wrap: wrap; gap: 8px; margin-top: .8rem; }
.var { min-width: 92px; padding: .5rem .8rem; border: 1px solid var(--line); border-radius: 9px; background: var(--code-bg); }
.var .k { display: block; font: 500 .7rem/1.3 var(--mono); color: var(--text-3); letter-spacing: .03em; }
.var .v { display: block; font: 600 1.45rem/1.2 var(--mono); font-variant-numeric: tabular-nums; color: var(--accent); }
.status { padding: .65rem .9rem; background: var(--code-bg); border: 1px solid var(--line); border-radius: 9px; font-size: .94rem; margin: 0; }
.status.ok { background: var(--green-soft); border-color: color-mix(in srgb, var(--green) 40%, var(--line)); }
.status.warn { background: var(--rose-soft); border-color: color-mix(in srgb, var(--rose) 40%, var(--line)); }
.trace-box { max-height: 330px; overflow: auto; border: 1px solid var(--line); border-radius: var(--raggio-2); background: var(--code-bg); }
.trace-box table { font-size: .84rem; }
.trace-box thead th { position: sticky; top: 0; z-index: 1; }
.trace-box th, .trace-box td { padding: .3rem .55rem; }
.fc-wrap { display: flex; justify-content: center; }
svg.fc { width: 100%; max-width: 380px; height: auto; display: block; }
svg.fc text { font-family: var(--mono); font-size: 14px; fill: var(--text); }
svg.fc text.lbl { font-family: var(--sans); font-size: 12px; fill: var(--text-3); }
svg.fc text.lbl-strong { font-family: var(--sans); font-size: 13px; font-weight: 700; fill: var(--text); }
svg.fc text.lbl-warn { font-family: var(--sans); font-size: 12px; fill: var(--rose); }
.fc-node rect, .fc-node polygon, .fc-node ellipse { stroke: var(--edge); stroke-width: 1.5; transition: stroke .2s, stroke-width .2s; }
.fc-node.action rect { fill: var(--node-action); }
.fc-node.test polygon { fill: var(--node-test); }
.fc-node.term ellipse { fill: var(--node-term); }
svg.fc .fc-node.term text { fill: var(--node-term-ink); }
.fc-edge { fill: none; stroke: var(--edge); stroke-width: 1.6; marker-end: url(#fc-arrow); }
.fc-node.is-active rect, .fc-node.is-active polygon, .fc-node.is-active ellipse { stroke: var(--active); stroke-width: 4; filter: drop-shadow(0 0 6px var(--accent-soft)); }
.fc-edge.is-active { stroke: var(--active); stroke-width: 3.2; marker-end: url(#fc-arrow-on); }
.arrowhead { fill: var(--edge); }
.arrowhead-on { fill: var(--active); }
.svg-defs { position: absolute; width: 0; height: 0; overflow: hidden; }
.symbols { display: grid; grid-template-columns: repeat(auto-fit, minmax(160px, 1fr)); gap: 8px; margin: 1rem 0; padding: 0; list-style: none; }
.symbols li { display: flex; gap: 10px; align-items: center; border: 1px solid var(--line); background: var(--surface-2); border-radius: 9px; padding: .55rem .8rem; margin: 0; font-size: .92rem; }
.symbols svg { flex: 0 0 46px; height: 28px; }

/* esercizi, domande, glossario, checklist */
.ex { border-top: 1px solid var(--line); padding: 1.1rem 0 .3rem; margin: .5rem 0; }
.ex h3 { margin: 0 0 .4rem !important; font-size: 1.06rem; }
.ex .lvl { font: 500 .7rem/1 var(--mono); letter-spacing: .05em; text-transform: uppercase; color: var(--accent); margin-left: .5rem; padding: .3rem .45rem; border: 1px solid var(--accent-line); border-radius: 6px; vertical-align: .15em; }
details.sol { margin-top: .7rem; border: 1px solid var(--line); border-radius: var(--raggio-2); background: var(--surface-2); overflow: hidden; }
details.sol > summary { cursor: pointer; font: 600 .86rem/1 var(--sans); color: var(--accent); padding: .75rem 1rem; list-style: none; display: flex; align-items: center; gap: .6rem; }
details.sol > summary::-webkit-details-marker { display: none; }
details.sol > summary::before { content: "›"; font: 600 1.1rem/1 var(--mono); transition: transform .2s var(--morbido); }
details.sol[open] > summary::before { transform: rotate(90deg); }
details.sol[open] > summary { border-bottom: 1px solid var(--line); }
details.sol > :not(summary) { margin-left: 1rem; margin-right: 1rem; }
details.sol > :last-child { margin-bottom: 1rem; }
.qa-list { margin-top: 1rem; border: 1px solid var(--line); border-radius: var(--raggio-2); background: var(--surface-2); overflow: hidden; }
details.qa { border-bottom: 1px solid var(--line); }
details.qa:last-child { border-bottom: 0; }
details.qa > summary { cursor: pointer; padding: .85rem 1rem; font-weight: 600; line-height: 1.45; list-style: none; display: flex; gap: .7rem; transition: background .15s; }
details.qa > summary:hover { background: var(--surface-3); }
details.qa > summary::-webkit-details-marker { display: none; }
details.qa > summary::before { content: "+"; font-family: var(--mono); color: var(--accent); flex: 0 0 1em; }
details.qa[open] > summary::before { content: "−"; }
details.qa .ans { padding: 0 1rem .9rem 2.7rem; color: var(--text-2); }
details.qa .ans > :first-child { margin-top: 0; }
.toolbar { display: flex; flex-wrap: wrap; gap: 10px; align-items: center; justify-content: space-between; }
dl.gloss { margin: 1rem 0; border: 1px solid var(--line); border-radius: var(--raggio-2); overflow: hidden; background: var(--surface-2); }
dl.gloss div { padding: .7rem 1rem; border-bottom: 1px solid var(--line); }
dl.gloss div:last-child { border-bottom: 0; }
dl.gloss dt { font-weight: 600; color: var(--text); }
dl.gloss dd { margin: .15rem 0 0; color: var(--text-2); }
@media (min-width: 760px) { dl.gloss div { display: grid; grid-template-columns: 12.5rem minmax(0, 1fr); gap: 1rem; } dl.gloss dd { margin: 0; } }
.checklist { list-style: none; padding: 0; margin: 1rem 0; border: 1px solid var(--line); border-radius: var(--raggio-2); background: var(--surface-2); overflow: hidden; }
.checklist li { margin: 0; border-bottom: 1px solid var(--line); }
.checklist li:last-child { border-bottom: 0; }
.checklist label { display: flex; gap: .8rem; align-items: flex-start; padding: .75rem 1rem; cursor: pointer; transition: background .15s; }
.checklist label:hover { background: var(--surface-3); }
.checklist input { appearance: none; -webkit-appearance: none; margin: .22em 0 0; width: 1.15em; height: 1.15em; border-radius: 5px; border: 1.5px solid var(--line-3); background: var(--code-bg); flex: 0 0 auto; display: grid; place-items: center; cursor: pointer; transition: background .15s, border-color .15s; }
.checklist input::after { content: ""; width: .55em; height: .3em; border-left: 2px solid var(--accent-ink); border-bottom: 2px solid var(--accent-ink); transform: translateY(-.08em) rotate(-45deg) scale(0); transition: transform .2s var(--morbido); }
.checklist input:checked { background: var(--accent); border-color: var(--accent); }
.checklist input:checked::after { transform: translateY(-.08em) rotate(-45deg) scale(1); }
.checklist input:checked + span { color: var(--text-3); text-decoration: line-through; text-decoration-color: var(--line-3); }
.pill { margin-left: auto; font: 600 .76rem/1 var(--mono); color: var(--accent); padding: .38rem .55rem; border-radius: 7px; background: var(--accent-soft); border: 1px solid var(--accent-line); }
footer.sources { margin-top: 3.5rem; padding-top: 1.4rem; border-top: 1px solid var(--line); font-size: .92rem; line-height: 1.6; color: var(--text-2); }
footer.sources h2 { font-size: 1.05rem !important; margin-bottom: .6rem !important; }
footer.sources .box.trap { font-size: .9rem; }

/* telefono: niente testo che esce dallo schermo */
@media (max-width: 640px) {
  body { font-size: 1rem; }
  .foglio { border-radius: var(--raggio); }
  pre.code { overflow-wrap: anywhere; font-size: .8rem; padding: .8rem .85rem; }
  table { font-size: .86rem; }
  th, td { padding: .5rem .55rem; }
  td.mono { white-space: normal; }
  .slides { margin-left: 0; }
  .trace-box th, .trace-box td { padding: .25rem .4rem; }
}
@media (max-width: 420px) {
  table { font-size: .8rem; }
  th, td { padding: .45rem .4rem; }
  .trace-box table { font-size: .74rem; }
}
table.stacked thead { display: none; }
table.stacked, table.stacked tbody, table.stacked tr, table.stacked th, table.stacked td { display: block; width: auto; }
table.stacked tr { padding: .6rem .8rem; border-bottom: 1px solid var(--line); }
table.stacked th, table.stacked td { border: 0; padding: .12rem 0 !important; text-align: left; white-space: normal; background: none; }
table.stacked td[data-label]::before, table.stacked th[data-label]::before { content: attr(data-label); display: block; font: 500 .68rem/1.4 var(--mono); letter-spacing: .05em; text-transform: uppercase; color: var(--text-3); }
table.stacked tr.row-bad { background: var(--rose-soft); }
table.stacked tr.row-ok { background: var(--green-soft); }
table.stacked tr.row-bad td, table.stacked tr.row-ok td { background: none; }

/* ---------- lezioni scritte in Markdown (strumenti/lezioni.mjs): formule, riquadri in più, quiz, grafici, strumenti ---------- */
.foglio .katex { font-size: 1.1em; }
.formula { margin: 1rem 0 1.15rem; padding: .3rem 0; overflow-x: auto; overflow-y: hidden; }
.formula .katex-display { margin: 0; }
.formula-errata { color: var(--rose); }
.box-label .katex, details.dim > summary .katex { text-transform: none; letter-spacing: 0; font-size: 1.15em; }
th .katex { text-transform: none; letter-spacing: 0; font-size: 1.3em; }
th.centro, td.centro { text-align: center; }
pre.code .str { color: var(--amber); }
.toolbar p { margin: 0; }
.box.esempio { background: linear-gradient(180deg, var(--green-soft), transparent 70%), var(--surface-2); border-color: color-mix(in srgb, var(--green) 35%, var(--line)); }
.box.esempio .box-label { color: var(--green); }
.box.idea { background: linear-gradient(180deg, var(--accent-soft), transparent 70%), var(--surface-2); border-color: var(--accent-line); }
.box.idea .box-label { color: var(--accent); }
.legend .l-esempio i { background: var(--green); } .legend .l-idea i { background: var(--accent); }
/* «Da ricordare» (il succo di una sezione), «Ripasso» (richiami di scuola) e «Prova tu» (domande in mezzo alla spiegazione) */
.box.ricorda { border-color: var(--line-2); border-left: 3px solid var(--text); background: var(--surface-3); }
.box.ricorda .box-label { color: var(--text); }
.box.ripasso { border: 1px dashed var(--line-3); background: var(--surface); }
.box.ripasso .box-label { color: var(--text-2); }
.box.ripasso .box-label::before { background: none; border: 1.5px solid currentColor; border-radius: 50%; }
.legend .l-ricorda i { background: var(--text); } .legend .l-ripasso i { border: 1.5px solid var(--text-2); border-radius: 50%; }
/* un titolo di sezione lungo va a capo restando accanto al numero della sezione */
.sec-head h2 { flex: 1 1 14rem; min-width: 0; text-wrap: balance; }
.prova { margin: 1.3rem 0; }
.prova > .box-label { color: var(--accent); margin: 0 0 .45rem !important; }
.prova > .box-label::before { border-radius: 50%; }
.prova .qa-list { margin-top: 0; border-color: var(--accent-line); }
details.dim.approfondimento > summary { color: var(--text-2); }
details.dim { margin: 1.1rem 0; border: 1px dashed var(--line-2); border-radius: var(--raggio-2); background: var(--surface-2); }
details.dim > summary { cursor: pointer; list-style: none; display: flex; align-items: center; gap: .55rem; padding: .75rem 1rem; font: 600 .72rem/1.3 var(--mono); letter-spacing: .06em; text-transform: uppercase; color: var(--text-3); }
details.dim > summary::-webkit-details-marker { display: none; }
details.dim > summary::before { content: "+"; font-size: .95rem; color: var(--accent); }
details.dim[open] > summary::before { content: "\2212"; }
details.dim[open] > summary { border-bottom: 1px dashed var(--line-2); }
.dim-corpo { padding: .2rem 1rem .9rem; }

/* quiz come quelli della prova scritta */
.quiz { margin: 1.2rem 0 1.6rem; }
.q-lista { list-style: none; margin: 0 !important; padding: 0; display: grid; gap: .9rem; counter-reset: domanda; }
li.q { counter-increment: domanda; margin: 0; padding: .95rem 1.05rem; border: 1px solid var(--line); border-radius: var(--raggio-2); background: var(--surface-2); }
.q-testo { color: var(--text); margin-bottom: .7rem; }
.q-testo::before { content: counter(domanda) "."; font: 600 .9rem var(--mono); color: var(--accent); margin-right: .5rem; }
.q-nota { font: 500 .7rem/1.3 var(--mono); letter-spacing: .06em; text-transform: uppercase; color: var(--text-3); margin: 0 0 .5rem !important; }
.q-opzioni { display: grid; gap: .4rem; }
.opz { position: relative; display: flex; align-items: center; gap: .75rem; padding: .5rem .8rem; border-radius: 9px; border: 1px solid var(--line); background: var(--code-bg); cursor: pointer; transition: border-color .15s, background .15s; -webkit-tap-highlight-color: transparent; }
.opz:hover { border-color: var(--line-3); }
.opz input { position: absolute; opacity: 0; pointer-events: none; }
.opz-segno { flex: none; width: 16px; height: 16px; border-radius: 50%; border: 1.5px solid var(--line-3); position: relative; }
.opz input[type="checkbox"] + .opz-segno { border-radius: 4px; }
.opz-segno::after { content: ""; position: absolute; inset: 3px; border-radius: inherit; background: var(--accent); transform: scale(0); transition: transform .2s var(--morbido); }
.opz input:checked + .opz-segno { border-color: var(--accent); }
.opz input:checked + .opz-segno::after { transform: scale(1); }
.opz:has(input:checked) { border-color: var(--accent-line); background: var(--accent-soft); }
.opz input:focus-visible + .opz-segno { outline: 2px solid var(--accent); outline-offset: 3px; }
.opz-testo { min-width: 0; overflow-x: auto; }
li.q.fatta .opz { cursor: default; }
.opz.giusta { border-color: color-mix(in srgb, var(--green) 70%, var(--line)) !important; background: var(--green-soft) !important; }
.opz.giusta::after { content: "\2713"; margin-left: auto; font-weight: 700; color: var(--green); }
.opz.errata { border-color: color-mix(in srgb, var(--rose) 70%, var(--line)) !important; background: var(--rose-soft) !important; }
.opz.errata::after { content: "\2717"; margin-left: auto; font-weight: 700; color: var(--rose); }
.opz.mancata { border-style: dashed !important; border-color: color-mix(in srgb, var(--green) 60%, var(--line)) !important; }
.opz.mancata::after { content: "era giusta"; margin-left: auto; font: 500 .66rem var(--mono); text-transform: uppercase; letter-spacing: .06em; color: var(--green); white-space: nowrap; }
html[lang="en"] .opz.mancata::after { content: "was correct"; }
.q-numero input { width: min(15rem, 100%); font: 600 1rem var(--mono); padding: .5rem .7rem; border: 1px solid var(--line-2); border-radius: 8px; background: var(--code-bg); color: var(--text); }
.q-numero input:focus { outline: none; border-color: var(--accent); box-shadow: 0 0 0 3px var(--accent-soft); }
.q-numero.giusta input { border-color: var(--green); background: var(--green-soft); }
.q-numero.errata input { border-color: var(--rose); background: var(--rose-soft); }
.q-giusto { margin-left: .8rem; font: 600 .95rem var(--mono); color: var(--green); }
.q-giusto::before { content: "risposta: "; font: 500 .8rem var(--sans); color: var(--text-3); }
html[lang="en"] .q-giusto::before { content: "answer: "; }
.q-azioni { display: flex; flex-wrap: wrap; align-items: center; gap: .8rem; margin-top: .8rem; }
.q-esito { font-size: .92rem; font-weight: 600; }
.q-esito.ok { color: var(--green); } .q-esito.no { color: var(--rose); }
.q-spiega { margin-top: .8rem; padding: .6rem .9rem; border-left: 2px solid var(--accent-line); border-radius: 0 8px 8px 0; background: var(--code-bg); font-size: .96rem; color: var(--text-2); }
.q-spiega::before { content: "Perché. "; font-weight: 700; color: var(--text); }
html[lang="en"] .q-spiega::before { content: "Why. "; }

/* grafici statici */
.grafico { margin: 1.4rem auto; max-width: 560px; }
.g-quadro { position: relative; width: 100%; border: 1px solid var(--line); border-radius: var(--raggio-2); background: var(--code-bg); overflow: hidden; }
.g-quadro svg { position: absolute; inset: 0; width: 100%; height: 100%; overflow: visible; }
.g-accento { --gc: var(--accent); } .g-blu { --gc: var(--blue); } .g-ambra { --gc: var(--amber); } .g-rosa { --gc: var(--rose); }
.g-viola { --gc: var(--violet); } .g-verde { --gc: var(--green); } .g-grigio { --gc: var(--text-3); } .g-base { --gc: var(--text); }
.g-griglia { stroke: var(--grid); stroke-width: 1; fill: none; vector-effect: non-scaling-stroke; }
.g-asse { stroke: var(--text-3); stroke-width: 1.2; fill: none; vector-effect: non-scaling-stroke; }
.g-punta { fill: var(--text-3); }
.g-linea, .g-poligono { fill: none; stroke: var(--gc, var(--text)); stroke-width: 2; stroke-linejoin: round; stroke-linecap: round; vector-effect: non-scaling-stroke; }
.g-poligono { fill: color-mix(in srgb, var(--gc, var(--text)) 10%, transparent); }
.g-poligono.g-pieno { fill: color-mix(in srgb, var(--gc, var(--text)) 24%, transparent); }
.g-punto, .g-punta-freccia { fill: var(--gc, var(--text)); stroke: none; }
.g-punto { stroke: var(--code-bg); stroke-width: 1.5; vector-effect: non-scaling-stroke; }
.g-punto.g-vuoto { fill: var(--code-bg); stroke: var(--gc, var(--text)); stroke-width: 2; }
.g-tratteggio { stroke-dasharray: 6 5; } .g-sottile { stroke-width: 1.2; } .g-spesso { stroke-width: 3.2; } .g-tenue { opacity: .55; }
.g-et { position: absolute; transform: translate(-50%, -50%); font: 500 .86rem/1.2 var(--sans); color: var(--gc, var(--text)); white-space: nowrap; pointer-events: none; text-shadow: 0 0 4px var(--code-bg), 0 0 2px var(--code-bg); }
.g-et .katex { font-size: 1.08em; }
.g-n { transform: translate(-50%, calc(-100% - 8px)); } .g-s { transform: translate(-50%, 8px); }
.g-e { transform: translate(10px, -50%); } .g-o { transform: translate(calc(-100% - 10px), -50%); }
.g-ne { transform: translate(8px, calc(-100% - 6px)); } .g-no { transform: translate(calc(-100% - 8px), calc(-100% - 6px)); }
.g-se { transform: translate(8px, 6px); } .g-so { transform: translate(calc(-100% - 8px), 6px); }
.g-c { transform: translate(-50%, -50%); }
.g-tacca { font: 400 .7rem/1 var(--mono); color: var(--text-3); }
.g-nome-asse { font: italic 500 .9rem/1 var(--sans); color: var(--text-2); }
.g-testo { color: var(--gc, var(--text-2)); }
.grafico figcaption { text-align: center; }

/* strumenti interattivi (assets/js/geometria.js) */
figure.widget { margin: 1.6rem 0; padding: 1rem; border: 1px solid var(--line-2); border-radius: var(--raggio); background: linear-gradient(180deg, var(--surface-3), var(--surface-2) 140px); box-shadow: var(--shadow); display: grid; gap: .9rem; min-width: 0; }
.widget-titolo { margin: 0; font-weight: 600; font-size: 1.04rem; color: var(--text); }
.widget-carica { margin: 0; color: var(--text-3); font-size: .9rem; }
.w-riga { display: flex; flex-wrap: wrap; gap: 10px 14px; align-items: flex-end; }
.w-campo { display: grid; gap: 5px; min-width: 0; }
.w-campo[hidden] { display: none; }
.w-campo > label, .w-etichetta { font: 500 .72rem/1.3 var(--mono); letter-spacing: .05em; text-transform: uppercase; color: var(--text-3); }
.w-solo-etichetta > label { font: 600 .95rem/1.3 var(--sans); letter-spacing: 0; text-transform: none; color: var(--text); }
.widget input[type=text], .widget input[type=number], .widget select, .widget textarea { font: 500 .95rem var(--mono); padding: .45rem .6rem; border: 1px solid var(--line-2); border-radius: 8px; background: var(--code-bg); color: var(--text); min-width: 0; max-width: 100%; }
.widget input[type=text] { width: 9.5rem; }
.widget input[type=number] { width: 5.2rem; }
.widget .w-largo input, .widget input.w-largo { width: min(18rem, 100%); }
.widget select { font-family: var(--sans); font-size: .92rem; max-width: min(22rem, 100%); }
.widget textarea.w-testo { width: min(22rem, 100%); resize: vertical; line-height: 1.55; }
.widget input:focus, .widget select:focus, .widget textarea:focus { outline: none; border-color: var(--accent); box-shadow: 0 0 0 3px var(--accent-soft); }
.w-cursore input[type=range] { width: min(13rem, 70vw); accent-color: var(--accent); }
.w-tela { display: block; width: 100%; max-width: 560px; margin: 0 auto; border: 1px solid var(--line); border-radius: var(--raggio-2); touch-action: none; }
.w-3d { cursor: grab; }
.w-lettura, .w-esito { font-size: .94rem; line-height: 1.6; color: var(--text-2); min-width: 0; overflow-x: auto; }
.w-lettura p, .w-esito p { margin: .35rem 0 !important; }
.w-lettura b, .w-esito b { color: var(--text); }
.w-nota { color: var(--text-3); font-size: .86rem; }
.w-aiuto { margin: 0 !important; font-size: .84rem; color: var(--text-3); }
.w-errore { color: var(--rose); font-weight: 600; }
.w-mat2 { display: grid; grid-template-columns: repeat(2, 4.6rem); gap: 6px; padding: 4px 10px; border-left: 2px solid var(--text-3); border-right: 2px solid var(--text-3); border-radius: 8px; }
.w-mat2 input[type=number] { width: 100%; }
.w-chips { display: flex; flex-wrap: wrap; gap: 6px; }
.w-passi { margin: 0 !important; padding-left: 1.4rem; display: grid; gap: .55rem; font-size: .9rem; }
.w-passi:empty { display: none; }
.w-passi li { margin: 0; overflow-x: auto; }
.w-mossa { display: block; font: 600 .86rem/1.5 var(--mono); color: var(--accent); margin-bottom: .25rem; overflow-wrap: anywhere; }
.w-sistema { display: inline-grid; gap: .1rem; margin: .4rem 0; padding: .3rem .8rem; border-left: 2px solid var(--accent-line); font: 500 .92rem/1.5 var(--mono); color: var(--text); }
.mx { display: inline-block; position: relative; vertical-align: middle; padding: 0 .5em; margin: .15rem .15rem; }
.mx::before, .mx::after { content: ""; position: absolute; top: 0; bottom: 0; width: .38em; border: 1.5px solid var(--text-2); }
.mx::before { left: 0; border-right: 0; border-radius: 5px 0 0 5px; }
.mx::after { right: 0; border-left: 0; border-radius: 0 5px 5px 0; }
.mx-g { display: inline-grid; row-gap: .05rem; font: 500 .9rem/1.35 var(--mono); }
.mx-g > span { padding: .08rem .5rem; text-align: right; color: var(--text); white-space: nowrap; }
.mx-g > span.mx-barra { border-left: 1.5px solid var(--text-3); }
.mx-g > span.mx-pivot { color: var(--accent); font-weight: 700; }
.mx-g > span.mx-cambiata { background: var(--amber-soft); }
table.w-ruffini { width: auto; margin: .6rem 0; background: none; font-family: var(--mono); }
table.w-ruffini td { padding: .3rem .7rem; border: 0; text-align: right; color: var(--text); }
table.w-ruffini .w-rf-a { border-right: 1.5px solid var(--text-2); color: var(--accent); font-weight: 700; }
table.w-ruffini tr.w-rf-somma td { border-top: 1.5px solid var(--text-2); font-weight: 700; }
table.w-ruffini td.w-rf-resto { border-left: 1.5px solid var(--text-2); color: var(--amber); }
@media (max-width: 640px) { figure.widget { padding: .8rem; } .mx-g { font-size: .82rem; } .mx-g > span { padding: .08rem .35rem; } }
/* simulatore della macchina di Von Neumann (assets/js/macchina.js) */
.mc-titoletto { margin: .2rem 0 .45rem !important; font: 500 .72rem/1.3 var(--mono); letter-spacing: .05em; text-transform: uppercase; color: var(--text-3); }
.mc-memoria { margin-top: 0; }
.var.mc-cambiato { border-color: var(--amber); background: var(--amber-soft); }
figure.widget[data-widget="macchina"] .trace-box td { white-space: normal; }
/* porte logiche, flip-flop ed esadecimale (assets/js/porte.js) */
.pt-griglia { display: grid; grid-template-columns: repeat(auto-fit, minmax(14rem, 1fr)); gap: 10px; }
.pt-scheda { border: 1px solid var(--line); border-radius: var(--raggio-2); background: var(--surface); padding: .5rem .6rem .25rem; min-width: 0; }
.pt-scheda h4 { margin: 0 0 .1rem; font: 600 .8rem/1.3 var(--mono); letter-spacing: .05em; color: var(--text-2); }
.pt-svg { display: block; width: 100%; height: auto; max-width: 34rem; }
.pt-flipflop { overflow-x: auto; }
.pt-flipflop .pt-svg { min-width: 20rem; }
.pt-svg .filo { stroke: var(--line-3); stroke-width: 2.5; fill: none; stroke-linecap: round; stroke-linejoin: round; transition: stroke .2s; }
.pt-svg .filo.uno { stroke: var(--accent); }
.pt-svg .porta { fill: var(--surface-2); stroke: var(--text-2); stroke-width: 2; }
.pt-svg .porta-linea { fill: none; stroke: var(--text-2); stroke-width: 2; }
.pt-svg .nodo { fill: var(--line-3); }
.pt-svg .nodo.uno { fill: var(--accent); }
.pt-svg text { font: 600 12px var(--mono); fill: var(--text-2); }
.pt-svg text.uno { fill: var(--accent); }
.pt-svg text.grande { font-size: 16px; }
.pt-svg text.nome { font: 600 9px var(--mono); fill: var(--text-3); letter-spacing: .04em; }
.pt-ingressi .btn[aria-pressed="true"] { border-color: var(--accent-line); background: var(--accent-soft); color: var(--accent); }
.pt-ingressi .btn:disabled { opacity: .55; cursor: default; }
.pt-gruppi { display: flex; flex-wrap: wrap; gap: 12px 18px; }
.pt-gruppo { display: grid; gap: 4px; justify-items: center; }
.pt-bits { display: flex; gap: 3px; }
.pt-bit { font: 600 1rem var(--mono); width: 2rem; padding: .35rem 0; border-radius: 7px; border: 1px solid var(--line-2); background: var(--code-bg); color: var(--text-2); cursor: pointer; }
.pt-bit[aria-pressed="true"] { background: var(--accent-soft); border-color: var(--accent-line); color: var(--accent); }
.pt-bit:focus-visible { outline: 2px solid var(--accent); outline-offset: 2px; }
.pt-cifra { font: 700 1.3rem var(--mono); color: var(--text); }
.pt-esa { font-family: var(--mono); color: var(--accent); letter-spacing: .06em; }
.pt-storia li { font-size: .88rem; font-weight: 400; color: var(--text-3); }
/* testo, colori, suoni e numeri in bit (assets/js/codifica.js) */
.cd-scorre { overflow-x: auto; min-width: 0; border: 1px solid var(--line); border-radius: var(--raggio-2); background: var(--surface-2); }
.cd-scorre:empty { display: none; }
.cd-tabella { width: auto; min-width: 100%; font-size: .88rem; }
.cd-tabella th, .cd-tabella td { padding: .45rem .65rem; }
.cd-tabella td { font-family: var(--mono); white-space: nowrap; font-variant-numeric: tabular-nums; }
.cd-tabella td.cd-lista { white-space: normal; }
.lg-tasti .lg-tasto { min-width: 2.4rem; font: 600 1rem var(--mono); padding: .3rem .55rem; }
.lg-formula { font-family: var(--mono); }
.widget input.lg-formula.w-largo { width: min(24rem, 100%); }
.lg-tabella th { font-family: var(--mono); font-weight: 600; white-space: nowrap; text-transform: none; letter-spacing: 0; text-align: center; font-size: .86rem; }
.lg-tabella td { text-align: center; }
.lg-tabella td.lg-v { color: var(--accent); font-weight: 600; }
.lg-tabella td.lg-f { color: var(--text-3); }
.lg-tabella td.lg-lettera { color: var(--text-2); font-weight: 500; }
.lg-tabella th.lg-finale, .lg-tabella td.lg-finale { border-left: 1.5px solid var(--line-2); }
.lg-tabella td.lg-finale.lg-v { color: var(--accent); font-weight: 700; }
.cd-byte { white-space: nowrap; }
table.cd-stretta .cd-largo, table.cd-colonne.cd-stretta th { display: none; }
table.cd-stretta:not(.cd-colonne) th, table.cd-stretta:not(.cd-colonne) td { padding: .4rem .45rem; }
.cd-tabella td.cd-simbolo { font: 600 1rem var(--sans); color: var(--text); }
.cd-bit { font-family: var(--mono); letter-spacing: .04em; white-space: nowrap; }
.cd-fisso { color: var(--text-3); }
.cd-dati { color: var(--accent); }
.cd-colore { display: flex; flex-wrap: wrap; gap: 12px 18px; align-items: center; }
.cd-cursori { display: grid; gap: 8px; min-width: 0; }
.cd-cursore { display: grid; grid-template-columns: 3.6rem minmax(6rem, 13rem) 5.2rem; gap: 10px; align-items: center; }
.cd-cursore input[type=range] { width: 100%; accent-color: var(--accent); }
.cd-campione { width: 7.5rem; height: 7.5rem; flex: none; border-radius: var(--raggio-2); border: 1px solid var(--line-3); }
.cd-svg { display: block; width: 100%; height: auto; }
.cd-svg line, .cd-svg polyline { vector-effect: non-scaling-stroke; }
.cd-svg .asse { stroke: var(--line-3); stroke-width: 1; }
.cd-svg .livello { stroke: var(--line-2); stroke-width: 1; stroke-dasharray: 3 4; }
.cd-svg .onda { fill: none; stroke: var(--text-3); stroke-width: 2; }
.cd-svg .ricostruito { fill: none; stroke: var(--accent); stroke-width: 2.5; stroke-linejoin: round; }
.cd-svg .asta { stroke: var(--amber); stroke-width: 1; opacity: .55; }
.cd-svg .punto { fill: var(--amber); }
.cd-bits { display: flex; gap: 4px; align-items: flex-end; width: max-content; padding: .5rem .6rem; }
.cd-colonnina { display: grid; gap: 3px; justify-items: center; }
.cd-peso { font: 500 .66rem/1.2 var(--mono); color: var(--text-3); min-height: .8rem; white-space: nowrap; }
.cd-virgola { font: 700 1.3rem/1 var(--mono); color: var(--text); padding: 0 2px .35rem; }
.cd-overflow { color: var(--amber); font-weight: 600; }
table.cd-colonne { min-width: 0; }
.cd-colonne th, .cd-colonne td { padding: .15rem .1rem; border: 0; background: none; }
.cd-colonne th { font: 500 .86rem var(--mono); letter-spacing: 0; text-transform: none; color: var(--text-2); text-align: right; padding-right: .7rem; vertical-align: middle; }
.cd-colonne td { text-align: center; vertical-align: middle; }
.cd-riporto { font: 600 .8rem/1 var(--mono); color: var(--amber); height: 1.3rem; }
.cd-totale th, .cd-totale td { border-top: 1.5px solid var(--text-2); padding-top: .4rem; }
.cd-somma { font: 700 1rem var(--mono); width: 2rem; }
.cd-fuori { width: 1.1rem; }
.cd-perso { font: 700 1rem var(--mono); color: var(--rose); text-decoration: line-through; }
/* modi interi, virgola, parita, hamming (lezioni 03 e 04 di Fondamenti) */
.cd-passi { margin: .3rem 0 .4rem; padding-left: 1.4rem; display: grid; gap: .2rem; }
.cd-passi li { overflow-wrap: anywhere; }
.cd-separa { width: 10px; flex: none; align-self: stretch; border-left: 1px dashed var(--line-3); margin-left: 5px; }
.cd-letture th[scope], .cd-letture tbody th { font: 500 .84rem var(--sans); text-transform: none; letter-spacing: 0; color: var(--text-2); white-space: nowrap; }
.cd-tabella td.cd-valore { font-weight: 700; font-size: 1rem; }
.cd-letture th, .cd-letture td { vertical-align: top; }
.cd-letture td.cd-lista { font-family: var(--sans); }
.cd-bitfisso { display: inline-block; font: 600 1rem var(--mono); width: 2rem; padding: .35rem 0; text-align: center; color: var(--text-2); }
.cd-paritabit { border-radius: 7px; border: 1px dashed var(--amber); color: var(--amber); }
.cd-vuoto { display: inline-block; width: 2rem; }
.pt-bit.cd-sbagliato { border-color: var(--rose); color: var(--rose); background: var(--rose-soft); }
.cd-diverso { color: var(--rose); font-weight: 700; text-decoration: underline; text-underline-offset: 3px; }
.cd-uguale { color: var(--text-3); }
.cd-tabella tr.cd-vicino td { background: var(--accent-soft); }
@media (max-width: 420px) { .cd-bitfisso, .cd-vuoto { width: 1.5rem; font-size: .95rem; } .cd-separa { width: 6px; margin-left: 3px; } }
@media (max-width: 640px) { .cd-cursore { grid-template-columns: 3.2rem minmax(5rem, 1fr) 4.6rem; } .cd-campione { width: 100%; height: 3.5rem; } }
@media (max-width: 420px) {
  .cd-colonne th { font-size: .7rem; padding-right: .3rem; }
  .cd-colonne .pt-bit, .cd-somma, .cd-bits .pt-bit { width: 1.5rem; font-size: .95rem; }
  .cd-bits { gap: 3px; padding: .45rem .5rem; }
}