/* style.css — tema "carta e penna" pulito.
 * Palette carta/inchiostro invariata, tipografia di sistema leggibile,
 * angoli dritti, niente rotazioni né texture rumorose. Zero dipendenze,
 * tutto offline (solo font di sistema). I selettori usati dal JS
 * (map.js, chapter.js, quiz.js, app.js, tracker.js) sono invariati. */

:root {
  --carta: #f4ecd8;          /* sfondo pagina: carta crema */
  --carta-chiara: #faf5e6;   /* foglietti / schede */
  --margine-rosso: rgba(198, 72, 72, 0.6);
  --inchiostro: #2b2b2b;     /* testo corpo: quasi-nero */
  --inchiostro-blu: #1e2a5a; /* titoli: blu-notte */
  --penna-blu: #2743a0;
  --penna-rossa: #c0392b;
  --penna-verde: #1e7d4f;
  --evidenziatore: rgba(250, 225, 90, 0.65);
  --radius: 8px;
  --font-ui: -apple-system, BlinkMacSystemFont, "Inter", "Segoe UI", Roboto, Helvetica, Arial, sans-serif;
  --font-testo: Georgia, "Times New Roman", serif;
}

* { box-sizing: border-box; }

body {
  margin: 0;
  color: var(--inchiostro);
  font-family: var(--font-testo);
  line-height: 1.6;
  background-color: var(--carta);
}

.wrap { max-width: 1020px; margin: 0 auto; padding: 0 20px; }

h1, h2, h3 {
  font-family: var(--font-ui);
  color: var(--inchiostro-blu);
  line-height: 1.25;
}

a { color: var(--penna-blu); text-decoration: underline; }
a:hover { color: var(--inchiostro-blu); }

/* ---------- Header / progresso / legenda ---------- */

.site-header {
  background: var(--carta-chiara);
  border-bottom: 2px solid var(--inchiostro-blu);
  padding: 32px 0 12px;
}
.eyebrow {
  color: var(--penna-rossa);
  text-transform: uppercase;
  letter-spacing: 0.12em;
  font-size: 0.78rem;
  margin: 0;
  font-family: var(--font-ui);
  font-weight: 700;
}
.site-header h1 { margin: 4px 0 0; font-size: 2rem; }
.subtitle { color: #4a4a4a; margin: 4px 0 16px; font-style: italic; }

.progress-meta { display: flex; justify-content: space-between; font-size: 0.9rem; color: #4a4a4a; }
.progress-bar {
  height: 14px;
  background: var(--carta-chiara);
  border: 2px solid var(--inchiostro-blu);
  border-radius: var(--radius);
  overflow: hidden;
}
.progress-fill {
  height: 100%;
  width: 0;
  background: linear-gradient(180deg, rgba(46, 125, 50, 0.85), rgba(46, 125, 50, 0.65));
  transition: width 0.4s ease;
}

.legend { display: flex; gap: 18px; list-style: none; padding: 10px 0 0; margin: 0; font-size: 0.85rem; color: #4a4a4a; flex-wrap: wrap; font-family: var(--font-ui); }
.dot { display: inline-block; width: 12px; height: 12px; border-radius: 50%; margin-right: 6px; vertical-align: baseline; border: 1px solid var(--inchiostro); }
.dot.status-todo { background: #fff; }
.dot.status-doing { background: #f2b234; }
.dot.status-done { background: var(--penna-verde); }

/* ---------- Mappa SVG ---------- */

.map-container {
  margin: 24px 0;
  background: var(--carta-chiara);
  border: 2px solid var(--inchiostro-blu);
  border-radius: var(--radius);
  padding: 12px;
}
.map-container svg { width: 100%; height: auto; display: block; }

.map-band { fill: #efe4c8; stroke: var(--inchiostro-blu); stroke-width: 1.5; stroke-dasharray: 10 4; }
.map-band-label {
  fill: var(--inchiostro-blu);
  font-size: 16px;
  font-weight: 700;
  font-family: var(--font-ui);
  text-decoration: underline;
}
.map-edge { fill: none; stroke: var(--inchiostro-blu); stroke-width: 2.5; }
.map-edge.dashed { stroke-dasharray: 7 6; }

.map-node { cursor: pointer; font-family: var(--font-testo); }
.map-node-box { stroke-width: 2.5; transition: filter 0.15s ease; }
.map-node:hover .map-node-box, .map-node:focus .map-node-box { filter: brightness(0.96); stroke-width: 3.5; }
.map-node:focus { outline: 2px dashed var(--penna-rossa); outline-offset: 3px; }
/* foglietti: carta chiara, bordo inchiostro */
.status-todo .map-node-box { fill: #fdf8ea; stroke: var(--inchiostro); }
.status-doing .map-node-box { fill: #fdf3d0; stroke: var(--inchiostro-blu); }
.status-done .map-node-box { fill: #eef3e4; stroke: var(--penna-verde); }
.map-node-badge { font-size: 15px; font-weight: 700; font-family: var(--font-ui); }
.status-todo .map-node-badge { fill: var(--penna-rossa); }
.status-doing .map-node-badge { fill: var(--penna-blu); }
.status-done .map-node-badge { fill: var(--penna-verde); }
.map-node-cap { fill: #5a5a5a; font-size: 11px; letter-spacing: 0.06em; }
.map-node-title { fill: var(--inchiostro); font-size: 14px; }

/* ---------- Schede aree ---------- */

.area-cards { display: grid; grid-template-columns: repeat(3, 1fr); gap: 12px; margin-bottom: 32px; }
.area-card {
  background: var(--carta-chiara);
  border: 2px solid var(--inchiostro);
  border-radius: var(--radius);
  padding: 16px;
}
.area-card h3 { margin: 0 0 6px; font-size: 1.15rem; }
.area-card p { margin: 0; color: #4a4a4a; font-size: 0.92rem; }
.ripasso-card {
  border-color: var(--penna-rossa);
  background: linear-gradient(180deg, transparent, var(--evidenziatore) 140%);
}

.notice {
  background: var(--carta-chiara);
  border: 2px dashed var(--penna-rossa);
  border-radius: var(--radius);
  padding: 12px 16px;
}
.muted { color: #5a5a5a; }
.small { font-size: 0.85rem; }

/* ---------- Pagina capitolo ---------- */

.chapter { padding-top: 24px; padding-bottom: 48px; }
.chapter-head { display: flex; align-items: center; gap: 12px; margin-bottom: 8px; flex-wrap: wrap; }
.back { color: var(--penna-blu); font-weight: 700; font-family: var(--font-ui); }
.area-tag {
  font-size: 0.8rem;
  padding: 3px 10px;
  border-radius: var(--radius);
  border: 2px solid var(--inchiostro);
  color: var(--inchiostro);
  font-family: var(--font-ui);
  font-weight: 700;
  /* effetto evidenziatore */
  background: linear-gradient(180deg, transparent 10%, var(--evidenziatore) 10%, var(--evidenziatore) 90%, transparent 90%);
}
.area-fondamenti { border-color: var(--penna-blu); }
.area-mlops { border-color: #b07d10; }
.area-applicazioni { border-color: var(--penna-verde); }

.block {
  position: relative;
  background-color: var(--carta-chiara);
  border: 2px solid var(--inchiostro);
  border-left: 4px solid var(--margine-rosso); /* idea del margine, in tinta unita */
  border-radius: var(--radius);
  padding: 18px 20px;
  margin: 20px 0;
}
.block h2 { margin: 0 0 10px; font-size: 1.35rem; }
.keywords { display: grid; grid-template-columns: 180px 1fr; gap: 8px 14px; margin: 0; }
.keywords dt {
  font-weight: 700;
  color: var(--inchiostro-blu);
  /* tinta piena evidenziatore: il termine sta DENTRO il riquadro */
  background: var(--evidenziatore);
  padding: 3px 10px;
  line-height: 1.5;
  border-radius: 2px;
  align-self: start;
  -webkit-box-decoration-break: clone;
  box-decoration-break: clone;
}
.keywords dd { margin: 0; }

/* ---------- Slide ---------- */

.slide-card {
  background: #fffdf4;
  border: 2px solid var(--inchiostro-blu);
  border-radius: var(--radius);
  /* Task5: slide protagonista della tab Lezione */
  padding: 28px 32px;
  min-height: 300px;
}
.slide-body { font-size: 1.08rem; line-height: 1.65; }
.slide-body h3 { margin-top: 0; font-size: 1.45rem; line-height: 1.3; }
.slide-body ul { padding-left: 22px; }
.slide-body li { margin: 8px 0; }
.slide-bar { display: flex; align-items: center; justify-content: space-between; margin-top: 16px; gap: 8px; }
.slide-counter { color: #5a5a5a; font-size: 0.9rem; font-family: var(--font-ui); }

/* ---------- Audio ---------- */

.audio-player { width: 100%; }
.audio-missing { margin: 0; font-style: italic; }

/* ---------- Quiz ---------- */

.quiz-q {
  border: 2px solid var(--inchiostro);
  border-radius: var(--radius);
  padding: 12px 16px;
  margin: 0 0 14px;
  background: #fffdf4;
}
.quiz-q legend { font-family: var(--font-ui); font-weight: 700; color: var(--inchiostro-blu); padding: 0 8px; }
.quiz-opt { display: block; padding: 5px 0; cursor: pointer; }
.quiz-opt:hover { background: rgba(250, 225, 90, 0.25); }
.quiz-opt input { margin-right: 8px; accent-color: var(--penna-rossa); }
.quiz-feedback { margin-top: 8px; padding: 8px 12px; font-size: 0.92rem; border-width: 2px; border-style: solid; border-radius: var(--radius); }
/* niente riempimenti piatti scuri: carta chiara + bordo penna */
.quiz-feedback.ok {
  background: #fffdf4;
  border-color: var(--penna-verde);
  color: #14532d;
}
.quiz-feedback.ko {
  background: #fffdf4;
  border-color: var(--penna-rossa);
  color: #7f1d1d;
}
.quiz-actions { display: flex; align-items: center; gap: 16px; flex-wrap: wrap; }
.quiz-result {
  color: var(--inchiostro);
  margin: 0;
  padding: 2px 8px;
  background: linear-gradient(180deg, transparent 20%, var(--evidenziatore) 20%, var(--evidenziatore) 88%, transparent 88%);
}

/* ---------- Bottone completamento ---------- */

.done-row { margin: 24px 0; text-align: center; }

/* ---------- Bottoni ---------- */

.btn {
  background: var(--carta-chiara);
  color: var(--inchiostro-blu);
  border: 2px solid var(--inchiostro);
  border-radius: var(--radius);
  padding: 9px 18px;
  font-size: 0.95rem;
  font-family: var(--font-ui);
  cursor: pointer;
  transition: border-color 0.12s ease, box-shadow 0.12s ease;
}
.btn:hover:not(:disabled) {
  border-color: var(--inchiostro-blu);
  box-shadow: 2px 2px 0 rgba(30, 42, 90, 0.35);
}
.btn:disabled { opacity: 0.4; cursor: default; }
.btn.primary { background: var(--evidenziatore); border-color: var(--inchiostro-blu); font-weight: 700; }
.btn.primary:hover { background: rgba(250, 225, 90, 0.85); }
.btn.big { font-size: 1.05rem; padding: 12px 28px; }
/* timbro di completamento */
.btn.done {
  background: #fffdf4;
  border: 3px double var(--penna-rossa);
  border-radius: var(--radius);
  color: var(--penna-rossa);
  font-weight: 700;
  letter-spacing: 0.04em;
}
.btn.done:hover:not(:disabled) { border-color: var(--penna-rossa); }
.btn.ghost { background: transparent; }
.slide-nav { min-width: 52px; }
button:focus-visible, a:focus-visible, input:focus-visible {
  outline: 2px dashed var(--penna-rossa);
  outline-offset: 2px;
}

/* ---------- Footer ---------- */

.site-footer { border-top: 2px solid var(--inchiostro-blu); padding: 16px 0 28px; background: var(--carta-chiara); }
.site-footer .wrap { display: flex; align-items: center; justify-content: space-between; gap: 12px; flex-wrap: wrap; }

@media (max-width: 640px) {
  .site-header h1 { font-size: 1.5rem; }
  .area-cards { grid-template-columns: 1fr; }
  .keywords { grid-template-columns: 1fr; }
  .quiz-actions { flex-direction: column; align-items: stretch; }
  .block { border-left-width: 3px; }
  .slide-bar { flex-wrap: wrap; }
  .map-container { padding: 8px; }
  .legend { gap: 12px; }
}

/* ---------- Pagina capitolo a tab + lezione guidata ---------- */
/* Solo riuso variabili esistenti: carta, inchiostro, evidenziatore. */

.tablist {
  display: flex;
  gap: 8px;
  flex-wrap: wrap;
  margin: 16px 0 0;
}
.tab {
  background: var(--carta-chiara);
  color: var(--inchiostro-blu);
  border: 2px solid var(--inchiostro);
  border-radius: var(--radius);
  padding: 9px 18px;
  font-size: 0.95rem;
  font-family: var(--font-ui);
  cursor: pointer;
}
.tab:hover { border-color: var(--inchiostro-blu); box-shadow: 2px 2px 0 rgba(30, 42, 90, 0.35); }
.tab[aria-selected="true"] {
  background: linear-gradient(180deg, transparent 10%, var(--evidenziatore) 10%, var(--evidenziatore) 90%, transparent 90%), var(--carta-chiara);
  border-color: var(--inchiostro-blu);
  font-weight: 700;
}
.tabpanel { margin-top: 0; }
.tabpanel[hidden] { display: none; }

/* Player custom */
.player { margin-bottom: 16px; }
.player-row { display: flex; align-items: center; gap: 8px; flex-wrap: wrap; }
.player .time {
  font-family: var(--font-ui);
  color: var(--inchiostro-blu);
  font-size: 0.9rem;
  white-space: nowrap;
}
.speed-group { display: inline-flex; gap: 4px; flex-wrap: wrap; }
.speed-btn { padding: 5px 10px; font-size: 0.82rem; }
.speed-btn.on { background: var(--evidenziatore); border-color: var(--inchiostro-blu); font-weight: 700; }
.seek-wrap { position: relative; margin-top: 10px; }
.seek { width: 100%; accent-color: var(--penna-rossa); }
.seek-ticks { position: relative; height: 8px; }
.seek-tick {
  position: absolute;
  top: 0;
  width: 2px;
  height: 8px;
  background: var(--inchiostro-blu);
  opacity: 0.55;
}

/* Trascrizione karaoke */
.transcript {
  margin-top: 16px;
  /* Task5: trascrizione secondaria e compatta, karaoke invariato */
  max-height: 180px;
  overflow-y: auto;
  padding: 8px 10px;
  border: 1px solid rgba(43, 43, 43, 0.35);
  border-radius: var(--radius);
  background: var(--carta-chiara);
  font-size: 0.92rem;
}
.sentence {
  margin: 0 0 8px;
  padding: 6px 10px;
  border-radius: 4px;
  line-height: 1.55;
}
.sentence.clickable { cursor: pointer; }
.sentence.clickable:hover { background: rgba(250, 225, 90, 0.25); }
.sentence.active {
  /* giallo evidenziatore del tema, tinta piena per massima visibilità */
  background: var(--evidenziatore);
  font-weight: 700;
  color: var(--inchiostro-blu);
}

@media (max-width: 640px) {
  .player-row { align-items: stretch; }
  /* Task5: slide protagonista anche su mobile, transcript compatto */
  .slide-card { padding: 20px 18px; min-height: 220px; }
  .slide-body { font-size: 1rem; }
  .slide-body h3 { font-size: 1.2rem; }
  .transcript { max-height: 140px; }
}

/* Formule MathML - task6 */
.slide-body li.has-formula { list-style: none; margin-left: -22px; }
.formula {
  /* riquadro formula: centrata, serif grande, evidenziatore sobrio in palette */
  text-align: center;
  font-family: var(--font-testo);
  font-size: 1.25rem;
  line-height: 2;
  padding: 12px 16px;
  margin: 12px 0 6px;
  background: var(--carta-chiara);
  border: 1px solid var(--margine-rosso);
  border-left: 4px solid var(--penna-blu);
  border-radius: var(--radius);
  overflow-x: auto;
}
.formula math { font-size: 1.2em; }
.formula-fb { display: none; }
.no-mathml .formula math { display: none; }
.no-mathml .formula-fb {
  /* fallback Unicode leggibile quando il browser non compone MathML */
  display: block;
  font-family: var(--font-testo);
  font-size: 1.15rem;
  font-style: italic;
  color: var(--inchiostro);
}
.formula-caption {
  font-size: 0.98rem;
  line-height: 1.6;
  color: var(--inchiostro);
  margin: 2px 0 10px;
  padding-left: 4px;
  border-left: 3px solid var(--evidenziatore);
}
.slide-body li.has-diagnosis { list-style: none; margin-left: -22px; }
.diagnosis-title {
  font-weight: 700;
  color: var(--inchiostro-blu);
  font-size: 1.08rem;
  margin: 10px 0 4px;
}
.diagnosis-text {
  background: var(--carta-chiara);
  border: 1px solid var(--margine-rosso);
  border-left: 4px solid var(--penna-verde);
  border-radius: var(--radius);
  padding: 10px 14px;
  line-height: 1.65;
  margin-bottom: 8px;
}