/* ===========================================================
   Corso ML — "tavola tecnica"
   Nessuna dipendenza esterna. Font di sistema. Funziona offline.

   Semantica del colore (non decorativa):
     signal  = struttura, ciò che è noto, navigazione
     delta   = lo scarto: errori, trappole, previsioni sbagliate
     verify  = eseguito e verificato: lab, risposte confermate
   =========================================================== */

:root {
  --paper:    #e9ebee;
  --paper-2:  #e0e4e9;
  --panel:    #f3f5f7;
  --ink:      #131820;
  --ink-2:    #48525f;
  --ink-3:    #7b8695;
  --rule:     #c4ccd5;
  --rule-2:   #d7dde4;

  --signal:      #1f3fc0;
  --signal-wash: #dfe5f8;
  --delta:       #b52a1b;
  --delta-wash:  #f7e2df;
  --verify:      #0d6350;
  --verify-wash: #dcece7;

  --display: Superclarendon, "Rockwell", "Roboto Slab", "Bitstream Charter", Georgia, serif;
  --body: Charter, "Iowan Old Style", "Bitstream Charter", Georgia, "Times New Roman", serif;
  --mono: ui-monospace, "SF Mono", SFMono-Regular, Menlo, "DejaVu Sans Mono", monospace;

  --gutter: 132px;
}

/* TRE STATI, non due.
   - nessun attributo  -> segue il sistema
   - data-tema="chiaro" -> chiaro anche se il sistema e' scuro
   - data-tema="scuro"  -> scuro anche se il sistema e' chiaro
   Il :not() sulla media query serve a far vincere la scelta esplicita
   dell'utente su quella del sistema, in entrambe le direzioni. */
@media (prefers-color-scheme: dark) {
  :root:not([data-tema="chiaro"]) {
    --paper:    #0d1117;
    --paper-2:  #12171f;
    --panel:    #161c25;
    --ink:      #dde4ed;
    --ink-2:    #9caab9;
    --ink-3:    #6a7684;
    --rule:     #262e3a;
    --rule-2:   #1e2530;

    --signal:      #7d9dff;
    --signal-wash: #172140;
    --delta:       #ff8272;
    --delta-wash:  #331a18;
    --verify:      #47c4a4;
    --verify-wash: #102b26;
  }
}

:root[data-tema="scuro"] {
    --paper:    #0d1117;
    --paper-2:  #12171f;
    --panel:    #161c25;
    --ink:      #dde4ed;
    --ink-2:    #9caab9;
    --ink-3:    #6a7684;
    --rule:     #262e3a;
    --rule-2:   #1e2530;

    --signal:      #7d9dff;
    --signal-wash: #172140;
    --delta:       #ff8272;
    --delta-wash:  #331a18;
    --verify:      #47c4a4;
    --verify-wash: #102b26;
}

* { box-sizing: border-box; }
html { scroll-behavior: smooth; }

body {
  margin: 0;
  background: var(--paper);
  color: var(--ink);
  font-family: var(--body);
  font-size: 17px;
  line-height: 1.72;
  -webkit-font-smoothing: antialiased;
  text-rendering: optimizeLegibility;
}

/* ---------------- impalcatura ---------------- */

.wrap { display: grid; grid-template-columns: 250px minmax(0, 1fr); min-height: 100vh; }

.sidebar {
  background: var(--paper-2);
  border-right: 1px solid var(--rule);
  padding: 30px 0 60px;
  position: sticky; top: 0; height: 100vh; overflow-y: auto;
}
.sidebar-inner { padding: 0 18px; }

.brand {
  display: block; text-decoration: none; color: var(--ink);
  font-family: var(--display); font-size: 1.02rem; font-weight: 700;
  line-height: 1.25; letter-spacing: -0.01em;
}
.brand-sub {
  font-family: var(--mono); font-size: 0.665rem; color: var(--ink-3);
  letter-spacing: 0.06em; margin-top: 6px; text-transform: uppercase;
}
/* Comparsa finché profilo.js ha personalizzato: false. Deve leggersi
   senza urlare, ma non deve poter passare inosservata. */
.profilo-rif {
  display: block; margin-top: 3px; text-transform: none; letter-spacing: 0.02em;
  font-size: 0.62rem; color: var(--delta); border-left: 2px solid var(--delta);
  padding-left: 6px; cursor: help;
}

.sidebar h4 {
  font-family: var(--mono); font-size: 0.635rem; font-weight: 600;
  text-transform: uppercase; letter-spacing: 0.12em; color: var(--ink-3);
  margin: 26px 0 7px; padding-bottom: 6px; border-bottom: 1px solid var(--rule);
}

a.nav {
  display: grid; grid-template-columns: 34px 1fr; gap: 8px; align-items: baseline;
  padding: 5px 8px; margin: 0 -8px; border-radius: 3px;
  color: var(--ink-2); text-decoration: none; font-size: 0.855rem; line-height: 1.35;
}
a.nav:hover { background: var(--panel); color: var(--ink); }
a.nav .tag { font-family: var(--mono); font-size: 0.68rem; color: var(--ink-3); }
a.nav.current { background: var(--signal-wash); color: var(--signal); font-weight: 600; }
a.nav.current .tag { color: var(--signal); }
a.nav.todo { color: var(--ink-3); }
a.nav.todo:hover { background: none; cursor: default; }

main { padding: 54px 56px 130px; max-width: 1040px; }

/* ---------------- tipografia ---------------- */

h1 {
  font-family: var(--display); font-size: 2.7rem; font-weight: 700;
  line-height: 1.08; letter-spacing: -0.025em; margin: 0 0 10px;
}
.subtitle {
  font-family: var(--mono); font-size: 0.79rem; color: var(--ink-3);
  letter-spacing: 0.02em; line-height: 1.6; margin: 0 0 40px; max-width: 60ch;
}
.eyebrow {
  font-family: var(--mono); font-size: 0.665rem; text-transform: uppercase;
  letter-spacing: 0.16em; color: var(--signal); margin: 0 0 10px; font-weight: 600;
}

h2 {
  font-family: var(--display); font-size: 1.42rem; font-weight: 700;
  letter-spacing: -0.012em; line-height: 1.25;
  margin: 56px 0 16px; padding-top: 15px; border-top: 2px solid var(--ink);
}
h3 { font-family: var(--display); font-size: 1.06rem; font-weight: 700; margin: 32px 0 9px; }

p { margin: 0 0 16px; max-width: 68ch; }
ul, ol { margin: 0 0 16px; padding-left: 20px; max-width: 66ch; }
li { margin-bottom: 8px; }
li::marker { color: var(--ink-3); }

a { color: var(--signal); text-underline-offset: 2.5px; }

strong { font-weight: 700; }

code {
  font-family: var(--mono); font-size: 0.82em;
  background: var(--panel); border: 1px solid var(--rule-2);
  padding: 1px 4.5px; border-radius: 3px; white-space: nowrap;
}

pre {
  font-family: var(--mono); background: var(--panel);
  border: 1px solid var(--rule); border-left: 3px solid var(--ink-3);
  border-radius: 4px; padding: 15px 18px; overflow-x: auto;
  font-size: 0.805rem; line-height: 1.62; margin: 0 0 18px; max-width: 82ch;
}
pre code { background: none; border: none; padding: 0; font-size: 1em; white-space: pre; }

table { border-collapse: collapse; margin: 0 0 20px; font-size: 0.88rem; display: block; overflow-x: auto; max-width: 100%; }
th, td { text-align: left; padding: 8px 14px 8px 0; border-bottom: 1px solid var(--rule-2); vertical-align: top; }
th {
  font-family: var(--mono); font-size: 0.655rem; font-weight: 600; color: var(--ink-3);
  text-transform: uppercase; letter-spacing: 0.1em; border-bottom: 1px solid var(--rule);
  white-space: nowrap;
}
td code { white-space: nowrap; }

/* ---------------- annotazioni a margine ---------------- */

.note {
  display: grid; grid-template-columns: var(--gutter) minmax(0, 1fr);
  gap: 22px; margin: 0 0 24px; align-items: start;
}
.note > .mark {
  font-family: var(--mono); font-size: 0.635rem; font-weight: 600;
  text-transform: uppercase; letter-spacing: 0.11em; line-height: 1.5;
  text-align: right; padding-top: 13px; color: var(--ink-3);
  border-top: 2px solid var(--rule);
}
.note > .body {
  border-top: 2px solid var(--rule); padding-top: 13px; min-width: 0;
}
.note > .body > :last-child { margin-bottom: 0; }
.note > .body p, .note > .body ul, .note > .body ol { max-width: 64ch; }

.note.nozione > .mark { color: var(--signal); border-top-color: var(--signal); }
.note.nozione > .body { border-top-color: var(--signal); }

.note.errore  > .mark { color: var(--delta); border-top-color: var(--delta); }
.note.errore  > .body { border-top-color: var(--delta); }

.note.lab     > .mark { color: var(--verify); border-top-color: var(--verify); }
.note.lab     > .body { border-top-color: var(--verify); }

.note.prevedi > .mark { color: var(--ink); border-top-color: var(--ink); }
.note.prevedi > .body { border-top-color: var(--ink); }
.note.prevedi > .body { background: var(--panel); padding: 13px 16px 2px; border-radius: 0 0 4px 4px; }

.note.ponte > .mark { color: var(--ink-3); border-top-style: dashed; }
.note.ponte > .body { border-top-style: dashed; }

/* ---------------- risposte a scomparsa ---------------- */

details.risposta {
  margin: 0 0 20px 0; max-width: 78ch;
  border: 1px solid var(--rule); border-radius: 4px; background: var(--panel);
}
details.risposta > summary {
  cursor: pointer; list-style: none; user-select: none;
  padding: 10px 15px; font-family: var(--mono); font-size: 0.735rem;
  font-weight: 600; letter-spacing: 0.03em; color: var(--verify);
  display: flex; align-items: center; gap: 9px;
}
details.risposta > summary::-webkit-details-marker { display: none; }
details.risposta > summary::before {
  content: "+"; display: inline-grid; place-items: center;
  width: 15px; height: 15px; border: 1px solid currentColor; border-radius: 2px;
  font-size: 0.72rem; line-height: 1; flex: none;
}
details.risposta[open] > summary::before { content: "\2212"; }
details.risposta[open] > summary { border-bottom: 1px solid var(--rule); }
details.risposta:focus-within { border-color: var(--verify); }
.risposta-inner { padding: 15px 18px 3px; }
.risposta-inner > :last-child { margin-bottom: 0; }

/* ---------------- mappa di allocazione (segnatura) ---------------- */

.alloc { margin: 0 0 10px; }
.alloc-head {
  display: flex; justify-content: space-between; align-items: baseline;
  font-family: var(--mono); font-size: 0.655rem; text-transform: uppercase;
  letter-spacing: 0.11em; color: var(--ink-3); padding-bottom: 8px;
  border-bottom: 1px solid var(--rule); margin-bottom: 3px;
}
.alloc-row {
  display: grid; grid-template-columns: 46px 40px 1fr 62px;
  gap: 12px; align-items: center;
  padding: 3px 6px 3px 0; margin: 0 -6px 0 0; border-radius: 3px;
  text-decoration: none; color: var(--ink);
}
a.alloc-row:hover { background: var(--signal-wash); }
.alloc-row .off  { font-family: var(--mono); font-size: 0.67rem; color: var(--ink-3); text-align: right; }
.alloc-row .id   { font-family: var(--mono); font-size: 0.7rem; color: var(--signal); font-weight: 600; }
.alloc-row .name { font-size: 0.875rem; line-height: 1.4; }
.alloc-row .size { font-family: var(--mono); font-size: 0.67rem; color: var(--ink-3); text-align: right; }

.alloc-row .bar { display: block; height: 3px; margin-top: 3px; background: var(--rule); border-radius: 2px; overflow: hidden; }
.alloc-row .bar i { display: block; height: 100%; background: var(--signal); border-radius: 2px; transform-origin: left; }
.alloc-row.todo .id { color: var(--ink-3); }
.alloc-row.todo .name { color: var(--ink-3); }
.alloc-row.todo .bar i { background: var(--rule); border: 1px dashed var(--ink-3); box-sizing: border-box; }
.alloc-sec {
  font-family: var(--mono); font-size: 0.635rem; text-transform: uppercase;
  letter-spacing: 0.12em; color: var(--ink-3); margin: 18px 0 5px; padding-top: 7px;
  border-top: 1px solid var(--rule-2);
}
.alloc-total {
  display: flex; justify-content: space-between; font-family: var(--mono);
  font-size: 0.67rem; color: var(--ink-3); margin-top: 12px; padding-top: 9px;
  border-top: 2px solid var(--ink);
}

@media (prefers-reduced-motion: no-preference) {
  .alloc-row .bar i { animation: fill 0.5s cubic-bezier(0.2, 0.7, 0.3, 1) both; }
  @keyframes fill { from { transform: scaleX(0); } to { transform: scaleX(1); } }
}

/* ---------------- utilità ---------------- */

.pill {
  display: inline-block; font-family: var(--mono); font-size: 0.645rem;
  text-transform: uppercase; letter-spacing: 0.09em; font-weight: 600;
  padding: 2px 7px; border-radius: 3px; border: 1px solid currentColor; margin-right: 7px;
}
.pill.cpu { color: var(--verify); }
.pill.gpu { color: var(--delta); }
.pill.opt { color: var(--ink-3); }
.pill.nucleo { color: var(--signal); }

/* percorsi: nucleo diagnostico vs approfondimento */
.alloc-row .nuc {
  font-family: var(--mono); font-size: 0.6rem; letter-spacing: 0.08em;
  color: var(--signal); margin-left: 7px; vertical-align: 1px;
}
.percorsi { display: grid; gap: 12px; margin: 14px 0 4px; }
.percorso {
  border: 1px solid var(--rule); border-radius: 4px; padding: 13px 16px;
  display: grid; grid-template-columns: 1fr auto; gap: 4px 16px; align-items: baseline;
}
.percorso .nome { font-family: var(--display); font-weight: 700; font-size: 1.02rem; }
.percorso .ore { font-family: var(--mono); font-size: 0.9rem; color: var(--ink-3); }
.percorso .che { grid-column: 1 / -1; font-size: 0.93rem; color: var(--ink-2); max-width: 64ch; }
.percorso.ridotto { border-left: 3px solid var(--signal); }

/* ricalcolo per il profilo del lettore, accanto al caso svolto */
.tuo-conto {
  border: 1px solid var(--signal); border-radius: 4px;
  padding: 13px 16px 4px; margin: 14px 0;
}
.tuo-head { display: flex; flex-wrap: wrap; gap: 4px 12px; align-items: baseline;
  margin-bottom: 10px; }
.tuo-head strong { font-family: var(--display); color: var(--signal); }
.tuo-head span { font-family: var(--mono); font-size: 0.68rem; color: var(--ink-3); }
.tuo-tab { margin: 0 0 10px; font-size: 0.9rem; }
.tuo-tab td, .tuo-tab th { padding: 4px 10px 4px 0; }
.tuo-tab td:nth-child(2), .tuo-tab td:nth-child(3) {
  font-family: var(--mono); text-align: right; }
.tuo-tab tr.tot td { border-top: 1px solid var(--rule); font-weight: 700; }
.tuo-tab .nota { font-size: 0.75rem; color: var(--ink-3); }
.tuo-tab .si { color: var(--verify); font-family: var(--mono); font-size: 0.72rem; }
.tuo-tab .no { color: var(--delta); font-family: var(--mono); font-size: 0.72rem; }
.tuo-avv { font-size: 0.88rem; color: var(--ink-2); max-width: 64ch; }
.tuo-fonte { font-size: 0.8rem; color: var(--ink-3); max-width: 66ch; }

.lede { font-size: 1.09rem; line-height: 1.62; max-width: 62ch; }

.goals { counter-reset: g; list-style: none; padding: 0; max-width: 70ch; }
.goals li {
  counter-increment: g; position: relative; padding-left: 42px; margin-bottom: 15px;
}
.goals li::before {
  content: counter(g, decimal-leading-zero); position: absolute; left: 0; top: 1px;
  font-family: var(--mono); font-size: 0.7rem; font-weight: 600; color: var(--signal);
  border: 1px solid var(--signal); border-radius: 3px; padding: 1px 5px;
}

.hw { width: 100%; }

.pagenav { display: flex; justify-content: space-between; gap: 16px; margin-top: 72px; padding-top: 20px; border-top: 2px solid var(--ink); }
.pagenav a {
  text-decoration: none; padding: 12px 16px; border: 1px solid var(--rule);
  border-radius: 4px; background: var(--panel); max-width: 46%; color: var(--ink); font-size: 0.9rem;
}
.pagenav a:hover { border-color: var(--signal); color: var(--signal); }
.pagenav .dir { display: block; font-family: var(--mono); font-size: 0.63rem; text-transform: uppercase; letter-spacing: 0.12em; color: var(--ink-3); margin-bottom: 3px; }

:focus-visible { outline: 2px solid var(--signal); outline-offset: 2px; border-radius: 2px; }

@media (max-width: 980px) {
  :root { --gutter: 0px; }
  .wrap { grid-template-columns: 1fr; }
  .sidebar { position: static; height: auto; border-right: none; border-bottom: 1px solid var(--rule); }
  main { padding: 30px 20px 90px; }
  h1 { font-size: 2.05rem; }
  .note { grid-template-columns: 1fr; gap: 0; }
  .note > .mark { text-align: left; border-top: none; padding-top: 0; padding-bottom: 5px; }
  .note > .body { border-top-width: 2px; }
  .alloc-row { grid-template-columns: 40px 36px 1fr 52px; gap: 8px; }
}

/* ---------------- comando del tema ---------------- */

.tema-box {
  display: flex; align-items: center; justify-content: space-between;
  gap: 10px; margin: 30px 0 0; padding-top: 12px;
  border-top: 1px solid var(--rule);
}
.tema-eti {
  font-family: var(--mono); font-size: 0.635rem; text-transform: uppercase;
  letter-spacing: 0.12em; color: var(--ink-3);
}
.tema-btn {
  font-family: var(--mono); font-size: 0.66rem; letter-spacing: 0.08em;
  text-transform: uppercase; font-weight: 600;
  color: var(--signal); background: var(--panel);
  border: 1px solid var(--rule); border-radius: 3px;
  padding: 3px 9px; cursor: pointer; min-width: 66px;
}
.tema-btn:hover { border-color: var(--signal); background: var(--signal-wash); }
.tema-btn:focus-visible { outline: 2px solid var(--signal); outline-offset: 2px; }

/* ---------------- utilità di spaziatura ----------------
   Sostituiscono gli attributi style="..." inline.
   Non e' pulizia formale: con `style-src 'self'` nella CSP del sito
   ogni stile inline viene BLOCCATO dal browser, e le pagine servite
   perdevano spaziature e separatori. Corretto spostandoli qui invece
   di allargare la CSP con 'unsafe-inline'. */

.m-10      { margin: 10px 0; }
.m-0       { margin: 0; }
.mt-10     { margin-top: 10px; }
.mt-12     { margin-top: 12px; }
.mt-14     { margin-top: 14px; }
.mt-16     { margin-top: 16px; }
.mt-18     { margin-top: 18px; }
.mb-6      { margin-bottom: 6px; }
.mb-8      { margin-bottom: 8px; }
.no-bordo  { border: none; }
.mt-14-nb  { margin-top: 14px; border: none; padding: 0; }

/* Il separatore piu' usato del corso: stacca un caveat, una condizione
   di validita' o una correzione dal corpo della risposta. Non e'
   decorativo — segna un cambio di statuto di cio' che segue. */
.stacco {
  border-top: 1px solid var(--rule);
  padding-top: 12px;
  margin-top: 14px;
}

.evidenza {
  font-family: var(--display); font-weight: 700;
  font-size: 1.2rem; line-height: 1.5;
}
.grande      { font-size: 1.05rem; }
.c-signal    { color: var(--signal); }
.c-delta     { color: var(--delta); }
.c-verify    { color: var(--verify); }