/* Palette ripresa dal sito "Palestra di logica" (la stessa degli altri percorsi). */
:root {
  --navy: #062c52; --blue: #0b5d88; --sky: #dff1f5; --paper: #f7f4ec; --ink: #132a3a; --muted: #5a7180;
  --coral: #ef765f; --yellow: #f4c95d; --green: #3a9564; --red: #c9533d; --line: #d8e1e4; --white: #fff;
  --radius: 18px; --serif: Georgia, 'Times New Roman', serif; --sans: 'Segoe UI', Arial, Helvetica, sans-serif;
  --topbar: 68px; --fs: 16px;
}
* { box-sizing: border-box; }
html { scroll-behavior: smooth; }
body { margin: 0; background: var(--paper); color: var(--ink); font: var(--fs)/1.6 var(--sans); }
body.lim { --fs: 19px; }
a { color: inherit; }
h1, h2, h3 { margin: 0; color: var(--navy); font-family: var(--serif); line-height: 1.12; }
h1 { font-size: clamp(2.3rem, 5vw, 3.8rem); letter-spacing: -.03em; }
h1 em { font-weight: 400; color: var(--coral); }
h2 { font-size: clamp(1.5rem, 2.6vw, 2.1rem); }
h3 { font-size: 1.25rem; }
code { font: .92em/1 Consolas, monospace; background: #e7eef0; padding: .15em .4em; border-radius: 5px; }
[hidden] { display: none !important; }
button { font: inherit; color: inherit; }
:focus-visible { outline: 3px solid var(--yellow); outline-offset: 2px; }

/* ---------- Barra superiore e navigazione ---------- */
.topbar { position: sticky; top: 0; z-index: 20; height: var(--topbar); display: flex; align-items: center; gap: 16px;
  padding: 0 clamp(14px, 3vw, 32px); background: #fff; border-bottom: 1px solid var(--line); }
.brand { display: flex; align-items: center; gap: 12px; font-weight: 800; color: var(--navy); text-decoration: none; line-height: 1.1; }
.brand small { display: block; font-size: 10px; letter-spacing: .08em; text-transform: uppercase; margin-top: 4px; color: #597183; font-weight: 700; }
.brand-mark { display: grid; place-items: center; width: 40px; height: 40px; border-radius: 50%; background: var(--navy); color: #fff; font-size: 14px; flex: none; }
.topbar-actions { margin-left: auto; display: flex; gap: 8px; }
.lim-toggle[aria-pressed="true"] { background: var(--navy); color: #fff; border-color: var(--navy); }
.menu-toggle { display: none; border: 1px solid var(--line); background: #fff; border-radius: 10px; width: 42px; height: 42px; font-size: 20px; cursor: pointer; }

.layout { display: grid; grid-template-columns: 270px minmax(0, 1fr); min-height: calc(100vh - var(--topbar)); }
.stage-nav { position: sticky; top: var(--topbar); align-self: start; height: calc(100vh - var(--topbar)); overflow-y: auto;
  padding: 20px 14px 30px; background: #fff; border-right: 1px solid var(--line); }
.stage-nav a { display: flex; align-items: center; gap: 10px; padding: 8px 10px; border-radius: 10px; text-decoration: none; font-weight: 600; font-size: .93rem; color: #34505f; }
.stage-nav a em { display: grid; place-items: center; flex: none; width: 26px; height: 26px; border-radius: 50%; background: var(--paper);
  font: 700 .8rem var(--sans); font-style: normal; color: var(--navy); }
.stage-nav a:hover { background: #f1f5f6; }
.stage-nav a.active { background: var(--navy); color: #fff; }
.stage-nav a.active em { background: var(--yellow); }
.stage-nav a.done em { background: var(--green); color: #fff; font-size: 0; }
.stage-nav a.done em::before { content: '✓'; font-size: .85rem; }
.nav-group { margin: 18px 10px 4px; font-size: .7rem; letter-spacing: .14em; text-transform: uppercase; font-weight: 800; color: var(--blue); }
.progress { margin: 0 6px 14px; padding: 12px; background: var(--paper); border-radius: 12px; font-size: .8rem; font-weight: 700; }
.progress span { display: flex; justify-content: space-between; }
.progress div { height: 8px; background: #e2e0d5; border-radius: 9px; margin-top: 8px; overflow: hidden; }
.progress i { display: block; height: 100%; width: 0; background: var(--green); transition: width .4s; }

main { min-width: 0; padding: clamp(20px, 4vw, 56px) clamp(16px, 4vw, 60px) 40px; }
main > section { max-width: 1180px; margin: 0 auto; }

/* ---------- Elementi comuni ---------- */
.kicker { margin: 0 0 10px; text-transform: uppercase; letter-spacing: .15em; font-size: .75rem; font-weight: 800; color: var(--blue); }
.lead { max-width: 760px; font-size: 1.12rem; color: #435d6e; }
.button { display: inline-flex; align-items: center; justify-content: center; gap: 8px; min-height: 46px; padding: 0 20px; border-radius: 10px;
  font-weight: 800; font-size: .92rem; text-decoration: none; border: 1px solid transparent; cursor: pointer; white-space: nowrap; }
.button.small { min-height: 38px; padding: 0 14px; font-size: .85rem; }
.button.primary { background: var(--navy); color: #fff; }
.button.primary:hover { background: var(--blue); }
.button.ghost { background: #fff; border-color: #aabac3; color: var(--navy); }
.button.ghost:hover { border-color: var(--navy); }
.button:disabled { opacity: .45; cursor: not-allowed; }
.actions, .row-buttons { display: flex; flex-wrap: wrap; gap: 10px; }
.actions { margin-top: 28px; }

.page-head { padding-bottom: 26px; margin-bottom: 30px; border-bottom: 1px solid var(--line); }
.page-head .button { margin-top: 12px; }
.section-title { margin: 48px 0 14px; }
.section-intro { max-width: 820px; color: var(--muted); margin: 0 0 20px; }
.two-col { display: grid; grid-template-columns: repeat(2, minmax(0, 1fr)); gap: 20px; margin: 20px 0; }
.card { background: #fff; border: 1px solid var(--line); border-radius: var(--radius); padding: clamp(20px, 3vw, 30px); }
.card h2 { font-size: 1.5rem; margin-bottom: 12px; }
.card p { color: #3e5968; }
.card.highlight { background: var(--navy); border-color: var(--navy); color: #d6e3e9; }
.card.highlight h2 { color: #fff; }
.card.highlight p, .card.highlight li { color: #d6e3e9; }
.card.highlight b { color: #fff; }
.memo { padding: 10px 14px; border-left: 4px solid var(--yellow); background: #fff7d9; color: var(--ink) !important; border-radius: 0 8px 8px 0; }
.card.highlight .memo b { color: var(--ink); }
.small-cards { margin-top: 30px; }
.small-cards h3 { margin-bottom: 8px; }
.faq a, .plan a, .card a { color: var(--blue); font-weight: 700; }

.checklist { margin: 0; padding: 0; list-style: none; display: grid; gap: 9px; }
.checklist li { position: relative; padding-left: 26px; }
.checklist li::before { content: '●'; position: absolute; left: 4px; top: 0; color: var(--coral); font-size: .8rem; }

.glossary { display: grid; grid-template-columns: max-content 1fr; gap: 8px 16px; margin: 0; }
.glossary dt { font-weight: 800; color: var(--navy); }
.glossary dd { margin: 0; color: #3e5968; }

.facts { display: grid; grid-template-columns: repeat(3, 1fr); gap: 1px; background: var(--line); border: 1px solid var(--line); border-radius: var(--radius); overflow: hidden; }
.facts div { background: #fff; padding: 22px; }
.facts b { display: block; font: 700 2.6rem var(--serif); color: var(--coral); line-height: 1; }
.facts span { color: var(--muted); font-size: .92rem; }

.rule-cards { display: grid; grid-template-columns: repeat(4, minmax(0, 1fr)); gap: 1px; background: var(--line); border: 1px solid var(--line); border-radius: var(--radius); overflow: hidden; margin: 10px 0 20px; }
.rule-cards.three { grid-template-columns: repeat(3, minmax(0, 1fr)); }
.rule-cards article { background: #fff; padding: 24px 22px; }
.rule-cards article > b { font: 700 1.9rem var(--serif); color: var(--coral); }
.rule-cards h3 { margin: 14px 0 8px; }
.rule-cards p { margin: 0; font-size: .95rem; color: #4d6573; }

.think { margin: 34px 0; padding: 20px 24px; background: #e7f2f4; border-left: 5px solid var(--blue); border-radius: 0 var(--radius) var(--radius) 0; }
.think b { text-transform: uppercase; letter-spacing: .12em; font-size: .75rem; color: var(--blue); }
.think p { margin: 6px 0 0; }
.alert { margin: 34px 0; padding: clamp(22px, 4vw, 40px); background: #fff4d6; border: 1px solid #ead69d; border-radius: var(--radius); }
.alert > strong { color: #9d4d36; text-transform: uppercase; letter-spacing: .12em; font-size: .75rem; }
.alert h2 { margin: 6px 0 10px; }
.alert p { margin: 0; max-width: 860px; font-size: 1.05rem; }

.priority-list { list-style: none; counter-reset: pr; padding: 0; margin: 0 0 18px; display: grid; grid-template-columns: repeat(3, minmax(0, 1fr)); gap: 14px; }
.priority-list li { counter-increment: pr; position: relative; padding: 22px 18px 18px; background: #fff; border: 1px solid var(--line); border-radius: 16px; }
.priority-list li::before { content: counter(pr); display: grid; place-items: center; width: 36px; height: 36px; border-radius: 50%; background: var(--coral); color: #fff; font: 700 1.1rem var(--serif); margin-bottom: 10px; }
.priority-list b { font: 700 1.2rem var(--serif); color: var(--navy); }
.priority-list p { margin: 6px 0 0; color: #4d6573; font-size: .95rem; }

/* ---------- Home ---------- */
.hero { display: grid; grid-template-columns: 1.15fr .85fr; gap: 50px; align-items: center; padding: 10px 0 40px; }
.hero-board { display: grid; place-items: center; }
.hero-grid { width: min(340px, 80vw); }
.path-map { display: grid; grid-template-columns: repeat(auto-fill, minmax(180px, 1fr)); gap: 14px; }
.path-card { position: relative; display: block; min-height: 170px; padding: 18px; background: #fff; border: 1px solid var(--line); border-radius: 16px; text-decoration: none; transition: transform .15s, box-shadow .15s; }
.path-card:hover { transform: translateY(-3px); box-shadow: 0 14px 30px #14394d1c; }
.path-card > b { display: grid; place-items: center; width: 34px; height: 34px; border-radius: 50%; background: var(--paper); color: var(--navy); margin-bottom: 12px; }
.path-card h3 { font-size: 1.08rem; }
.path-card p { margin: 6px 0 22px; font-size: .86rem; color: var(--muted); line-height: 1.45; }
.path-card span { position: absolute; bottom: 14px; font-size: .75rem; font-weight: 800; color: var(--blue); }
.path-card.accent { background: var(--navy); border-color: var(--navy); }
.path-card.accent h3 { color: #fff; }
.path-card.accent p { color: #c8dbe5; }
.path-card.accent span { color: var(--yellow); }
.path-card.accent > b { background: var(--yellow); }
.how-to { display: grid; grid-template-columns: 1fr 1fr; gap: 40px; margin-top: 36px; padding: 30px; background: #fff; border-radius: var(--radius); border: 1px solid var(--line); }
.how-to ol { padding-left: 20px; margin: 10px 0 0; }
.how-to p { margin: 10px 0 0; color: #3e5968; }
.faq { display: grid; gap: 10px; }
.faq details { background: #fff; border: 1px solid var(--line); border-radius: 14px; padding: 0 20px; }
.faq summary { cursor: pointer; padding: 16px 0; font-weight: 700; color: var(--navy); }
.faq details[open] summary { border-bottom: 1px solid #e8eef0; }
.faq p { margin: 12px 0 16px; color: #3e5968; }

/* ---------- Storia ---------- */
.timeline { list-style: none; margin: 0; padding: 0; position: relative; }
.timeline::before { content: ''; position: absolute; left: 118px; top: 10px; bottom: 10px; width: 3px; background: var(--line); }
.timeline li { position: relative; display: grid; grid-template-columns: 100px 1fr; gap: 40px; padding: 12px 0; }
.timeline li::before { content: ''; position: absolute; left: 111px; top: 22px; width: 17px; height: 17px; border-radius: 50%; background: var(--coral); border: 3px solid var(--paper); }
.timeline time { font: 700 1rem var(--serif); color: var(--coral); text-align: right; padding-top: 12px; }
.timeline li > div { background: #fff; border: 1px solid var(--line); border-radius: 14px; padding: 14px 20px; }
.timeline p { margin: 4px 0 0; color: #3e5968; }

/* ---------- Esercizi e widget ---------- */
.widget { margin: 0 0 20px; }
.exercise { display: grid; grid-template-columns: minmax(260px, 480px) minmax(260px, 1fr); gap: clamp(18px, 3vw, 36px); align-items: start;
  padding: clamp(14px, 2.5vw, 28px); background: var(--sky); border-radius: var(--radius); }
body.lim .exercise { grid-template-columns: minmax(300px, 600px) minmax(260px, 1fr); }
.exercise-panel { display: grid; gap: 12px; align-content: start; min-width: 0; }
.exercise-panel h3 { font-size: 1.45rem; }
.task { margin: 0; font-size: 1.08rem; font-weight: 600; color: var(--ink); }
.feedback { margin: 0; padding: 12px 14px; border-radius: 10px; background: #fff; border-left: 5px solid #b8c9d0; min-height: 48px; }
.feedback:empty { display: none; }
.feedback.ok { border-color: var(--green); background: #e6f5ea; }
.feedback.no { border-color: var(--red); background: #fdebe6; }
.feedback.warn { border-color: var(--yellow); background: #fff7d9; }
.hint-text { margin: 0; padding: 10px 14px; background: #fff; border-radius: 10px; border: 1px dashed #aabac3; }
.switch { display: flex; align-items: center; gap: 8px; font-size: .92rem; font-weight: 600; cursor: pointer; }
.switch input { width: 18px; height: 18px; accent-color: var(--navy); }
.tag { display: inline-block; justify-self: start; padding: 3px 10px; border-radius: 99px; font-size: .75rem; font-weight: 800; letter-spacing: .04em; background: #e7eef0; color: var(--navy); }

.steps { display: flex; flex-wrap: wrap; gap: 8px; margin-bottom: 12px; }
.steps button { display: inline-flex; align-items: center; gap: 8px; padding: 7px 14px 7px 7px; border-radius: 99px; border: 1px solid #b8c9d0; background: #fff; cursor: pointer; font-size: .88rem; font-weight: 700; }
.steps button span { display: grid; place-items: center; width: 26px; height: 26px; border-radius: 50%; background: var(--paper); font-size: .8rem; }
.steps button.active { background: var(--navy); border-color: var(--navy); color: #fff; }
.steps button.active span { background: var(--yellow); color: var(--navy); }
.steps button.solved span { background: var(--green); color: #fff; }

.big-number { margin: 0; font: 700 2.4rem var(--serif); color: var(--coral); }
.answer-buttons { display: flex; flex-wrap: wrap; gap: 8px; }
.answer-buttons button { min-width: 72px; padding: 10px 16px; border: 1px solid #b8c9d0; border-radius: 10px; background: #fff; cursor: pointer; font: 700 1rem var(--sans); }
.answer-buttons button:hover { border-color: var(--navy); }
.answer-buttons button.correct { background: #e4f5e8; border-color: var(--green); }
.answer-buttons button.wrong { background: #fdebe6; border-color: var(--red); }
.answer-buttons.mono button { font-family: Consolas, monospace; }
.score-list { margin: 0; padding: 0; list-style: none; display: grid; gap: 4px; font-size: .95rem; }
.score-list li { display: flex; align-items: center; gap: 8px; padding: 6px 10px; background: #fff; border-radius: 8px; }
.score-list li.now { box-shadow: 0 0 0 2px var(--yellow); font-weight: 800; }
.score-list li.done { color: var(--green); }
.score-list code { background: var(--paper); }


/* ---------- Tabelle ---------- */
.table-wrap { overflow-x: auto; background: #fff; border: 1px solid var(--line); border-radius: var(--radius); }
table { width: 100%; border-collapse: collapse; min-width: 640px; }
th, td { padding: 12px 16px; text-align: left; vertical-align: top; border-bottom: 1px solid #e8eef0; }
thead th { background: var(--navy); color: #fff; font-size: .9rem; }
tbody th { color: var(--navy); font-size: .92rem; width: 22%; }
tbody tr:last-child > * { border-bottom: 0; }

/* ---------- Quiz ---------- */
.quiz { margin: 50px 0 10px; padding: clamp(20px, 3vw, 34px); background: #fff; border: 2px solid var(--navy); border-radius: var(--radius); }
.quiz > h2::before { content: '✎ '; color: var(--coral); }
.quiz-q { padding: 16px 0; border-bottom: 1px solid #e8eef0; }
.quiz-text { margin: 0 0 10px; font-weight: 600; font-size: 1.05rem; }
.quiz-options { display: flex; flex-wrap: wrap; gap: 8px; }
.quiz-options button { padding: 10px 16px; border: 1px solid #b8c9d0; border-radius: 10px; background: #fff; cursor: pointer; font-weight: 600; text-align: left; }
.quiz-options button:hover { border-color: var(--navy); }
.quiz-options button.correct { background: #e4f5e8; border-color: var(--green); }
.quiz-options button.wrong { background: #fdebe6; border-color: var(--red); text-decoration: line-through; }
.quiz-why { margin: 10px 0 0; font-size: .95rem; }
.quiz-why:empty { display: none; }
.quiz-why.ok { color: #1f6b41; }
.quiz-why.no { color: #9d3b28; }
.quiz-score { margin: 16px 0 0; font-weight: 800; color: var(--navy); }
.quiz-score:empty { display: none; }

/* ---------- Pager e footer ---------- */
.pager { display: flex; justify-content: space-between; gap: 12px; margin-top: 50px; padding-top: 24px; border-top: 1px solid var(--line); }
.site-footer { display: flex; gap: 20px; align-items: center; padding: 22px clamp(16px, 4vw, 60px); background: #fff; border-top: 1px solid var(--line); font-size: .9rem; }
.site-footer span { color: var(--muted); flex: 1; }
.site-footer a { font-weight: 800; color: var(--blue); text-decoration: none; }
.site-footer nav { display: flex; gap: 18px; flex-wrap: wrap; }
/* Firma dell'autore: corsivo serif, come una firma a penna. */
.signature { font: italic 400 1.45rem/1.2 var(--serif); color: var(--navy); letter-spacing: .01em; }
.hero .signature { margin: 18px 0 0; padding-left: 46px; position: relative; font-size: 1.6rem; }
.hero .signature::before { content: ''; position: absolute; left: 0; top: 55%; width: 34px; height: 2px; background: var(--coral); }
.site-footer .signature { font-size: 1.25rem; font-weight: 400; }

/* Ritorno alla pagina "Palestra di logica" (barra in alto e menu delle tappe). */
.stage-nav a.hub-link { margin: 0 0 12px; padding: 10px; background: #e7f2f4; color: var(--navy); font-weight: 800; line-height: 1.2; }
.stage-nav a.hub-link em { background: var(--navy); color: #fff; }
.stage-nav a.hub-link { flex-wrap: wrap; row-gap: 0; }
.stage-nav a.hub-link small { flex-basis: 100%; padding-left: 36px; margin-top: -4px; font-size: .72rem; font-weight: 600; color: var(--muted); }
.stage-nav a.hub-link:hover { background: #d6eaee; }
@media (max-width: 900px) { .topbar-actions .hub-back { display: none; } }

/* ---------- Simulatore a schermo intero (solo cellulare) ---------- */
.fs-open { display: none; }
@media (max-width: 700px), (pointer: coarse) and (max-height: 520px) {
  .fs-open { display: flex; width: 100%; min-height: 52px; margin: 0 0 12px; font-size: 1rem; }
}
html.fs-lock, html.fs-lock body { overflow: hidden; }
.fs-overlay { position: fixed; inset: 0; z-index: 1000; display: flex; flex-direction: column; gap: 8px; height: 100vh; height: 100dvh; overflow: hidden;
  padding: max(8px, env(safe-area-inset-top)) max(8px, env(safe-area-inset-right)) max(8px, env(safe-area-inset-bottom)) max(8px, env(safe-area-inset-left));
  background: var(--sky); }
.fs-bar { display: flex; align-items: center; gap: 8px; }
.fs-title { flex: 1; min-width: 0; }
.fs-title .sim-status { margin: 0; font-size: 1.05rem; white-space: nowrap; overflow: hidden; text-overflow: ellipsis; }
.fs-title .sim-status::before { width: 16px; height: 16px; }
.fs-icon { flex: none; width: 44px; height: 44px; border: 1px solid #b8c9d0; border-radius: 12px; background: #fff; color: var(--navy); font-size: 1.3rem; cursor: pointer; }
.fs-game { flex: 1; min-height: 0; display: flex; flex-direction: column; align-items: center; justify-content: center; gap: 6px; }
.fs-game > * { width: 100%; max-width: var(--fs-board, 100%); }
.fs-game > .board-frame { flex: none; padding: 5px; border-radius: 10px; }
.fs-side { display: grid; gap: 8px; }
.fs-side .feedback, .fs-side .feedback:empty { display: block; min-height: 3.3em; margin: 0; padding: 8px 12px; font-size: .9rem; line-height: 1.35; }
.fs-side .row-buttons { display: grid; grid-auto-flow: column; grid-auto-columns: minmax(0, 1fr); gap: 6px; }
.fs-side .row-buttons .button { min-height: 46px; padding: 0 4px; white-space: normal; line-height: 1.1; font-size: .8rem; }
.fs-sheet { position: absolute; inset: 0; z-index: 5; display: flex; flex-direction: column; padding: inherit; background: #fff; }
.fs-sheet-head { display: flex; align-items: center; justify-content: space-between; gap: 10px; padding-bottom: 10px; border-bottom: 1px solid var(--line); color: var(--navy); }
.fs-sheet-body { flex: 1; min-height: 0; overflow-y: auto; display: grid; align-content: start; gap: 14px; padding-top: 12px; }
.fs-sheet-body .sim-settings { grid-template-columns: 1fr; }
@media (orientation: landscape) {
  .fs-overlay { display: grid; grid-template-columns: minmax(0, 1.25fr) minmax(0, 1fr); grid-template-rows: auto minmax(0, 1fr); column-gap: 12px; }
  .fs-bar { grid-column: 1 / -1; }
  .fs-game { height: 100%; }
  .fs-side { align-content: center; }
}

/* ---------- Scelta della partita (riquadro sopra la griglia) ---------- */
.setup-card { position: absolute; top: 0; left: 0; right: 0; min-height: 100%; z-index: 12; box-shadow: 0 14px 30px #062c5240; display: flex; flex-direction: column; justify-content: safe center; gap: 10px;
  padding: clamp(10px, 3%, 24px); background: #062c52f2; border-radius: 12px; color: #fff; }
.setup-title { margin: 0; font: 700 clamp(1.15rem, 3.4vw, 1.6rem) var(--serif); color: #fff; text-align: center; }
.setup-group { display: grid; gap: 4px; }
.setup-label { font-size: .7rem; font-weight: 800; letter-spacing: .1em; text-transform: uppercase; color: #9fc4d6; }
.setup-options { display: grid; grid-auto-flow: column; grid-auto-columns: minmax(0, 1fr); gap: 6px; }
.setup-options button { min-height: 42px; padding: 6px 4px; border: 2px solid #ffffff40; border-radius: 10px; background: #ffffff14; color: #fff;
  font: 800 .88rem/1.15 var(--sans); cursor: pointer; }
.setup-options button:hover { border-color: #ffffffaa; }
.setup-options button.active { background: var(--yellow); border-color: var(--yellow); color: var(--navy); }
.setup-desc { margin: 0; font-size: .82rem; color: #d6e3e9; text-align: center; }
.setup-card .setup-start { width: 100%; min-height: 48px; margin-top: 2px; background: var(--yellow); color: var(--navy); font-size: 1rem; }
.setup-card .setup-start:hover { background: #ffd978; }

@media (max-width: 700px) {
  .setup-card { gap: 6px; padding: 8px 10px; }
  .setup-title { font-size: 1.05rem; }
  .setup-label { font-size: .62rem; }
  .setup-options { gap: 4px; }
  .setup-options button { min-height: 34px; padding: 3px 2px; font-size: .78rem; }
  .setup-desc { font-size: .72rem; }
  .setup-card .setup-start { min-height: 40px; font-size: .92rem; }
}

/* Scelta della partita a schermo intero: il riquadro usa tutta la larghezza sotto la barra in alto.
   C'e' spazio anche con i caratteri del telefono ingranditi; se non basta si scorre, con
   "Inizia la partita" sempre visibile in fondo. */
.fs-overlay .setup-card { position: fixed; top: calc(max(8px, env(safe-area-inset-top)) + 52px);
  left: max(8px, env(safe-area-inset-left)); right: max(8px, env(safe-area-inset-right)); bottom: auto;
  min-height: 0; max-height: calc(100vh - 70px); max-height: calc(100dvh - 70px); overflow-y: auto;
  justify-content: flex-start; gap: 12px; padding: 16px 12px; }
.fs-overlay .setup-title { font-size: 1.3rem; }
.fs-overlay .setup-label { font-size: .7rem; }
.fs-overlay .setup-options { gap: 6px; }
.fs-overlay .setup-options button { min-height: 46px; font-size: .92rem; }
.fs-overlay .setup-desc { font-size: .82rem; }
.setup-card .setup-start { position: sticky; bottom: 0; box-shadow: 0 -10px 18px #062c52; }
.fs-overlay .setup-card .setup-start { min-height: 52px; font-size: 1.05rem; }

/* Riepilogo delle scelte della partita (al posto dei menu a tendina) */
.sim-summary { display: flex; align-items: center; justify-content: space-between; gap: 10px; flex-wrap: wrap;
  padding: 10px 12px; background: var(--paper); border-radius: 12px; }
.sim-summary-text { font-weight: 800; color: var(--navy); }

/* ---------- Griglia del sudoku ----------
 * La griglia si adatta alla larghezza che ha a disposizione: i numeri si ridimensionano da soli
 * (unità "cqw" = centesimi della larghezza della griglia), così funziona identica sul telefono,
 * sul computer e nella modalità LIM. Le righe spesse dei riquadri sono messe dal programma
 * con le classi .bt e .bl, perché dipendono dal formato (9×9, 6×6 o 4×4). */
.board-frame { position: relative; width: 100%; max-width: 620px; margin: 0 auto; padding: 10px; background: #fff; border: 1px solid var(--line); border-radius: 14px; }
.sudoku { container-type: inline-size; min-width: 0; display: grid; grid-template-columns: repeat(var(--cells), 1fr); aspect-ratio: 1;
  border: 3px solid var(--navy); border-radius: 4px; overflow: hidden; background: var(--navy); gap: 1px; touch-action: manipulation; }
.sudoku .cell { display: grid; place-items: center; position: relative; min-width: 0; overflow: hidden; padding: 0; border: 0; background: #fff; cursor: pointer;
  font: 700 calc(58cqw / var(--cells)) var(--sans); color: var(--blue); line-height: 1; }
.sudoku .cell.bt { box-shadow: inset 0 3px 0 var(--navy); }
.sudoku .cell.bl { box-shadow: inset 3px 0 0 var(--navy); }
.sudoku .cell.bt.bl { box-shadow: inset 0 3px 0 var(--navy), inset 3px 0 0 var(--navy); }
.sudoku .cell.given { background: #eef2f3; color: var(--navy); }
.sudoku .cell.peer { background: #eaf4f7; }
.sudoku .cell.given.peer { background: #e2eef1; }
.sudoku .cell.same { background: #dff1f5; color: var(--navy); }
.sudoku .cell.sel { background: var(--yellow); color: var(--navy); }
.sudoku .cell.wrong { color: var(--red); text-decoration: line-through; }
.sudoku .cell.conflict { background: #fdebe6; color: var(--red); }
.sudoku .cell.look { background: #fff3cd; }
.sudoku .cell.target { background: #d8f0e0; box-shadow: inset 0 0 0 3px var(--green); }
.sudoku .cell.target.bt, .sudoku .cell.target.bl { box-shadow: inset 0 0 0 3px var(--green); }
.sudoku .cell:focus-visible { outline: 3px solid var(--coral); outline-offset: -3px; z-index: 2; }
.sudoku.locked .cell { cursor: default; }
/* Candidati scritti a matita */
.sudoku .marks { display: grid; grid-template-columns: repeat(3, 1fr); width: 100%; height: 100%; padding: 4%; }
.sudoku .marks span { display: grid; place-items: center; font: 700 calc(26cqw / var(--cells)) var(--sans); color: #6b8391; }
.sudoku .marks span.gone { opacity: .18; text-decoration: line-through; }
.sudoku .marks span.pick { color: var(--coral); background: #ffe8e2; border-radius: 3px; }
.sudoku .cell.small-marks .marks span { font-size: calc(21cqw / var(--cells)); }
/* Coordinate intorno alla griglia (si accendono dalle impostazioni) */
.board-frame.coords { padding: 10px 10px 10px 26px; }
.board-frame .coord-row, .board-frame .coord-col { position: absolute; display: grid; font: 800 .68rem var(--sans); color: var(--muted); }
.board-frame .coord-col { top: -4px; left: 10px; right: 10px; grid-template-columns: repeat(var(--cells), 1fr); text-align: center; }
.board-frame .coord-row { left: 6px; top: 10px; bottom: 10px; grid-template-rows: repeat(var(--cells), 1fr); align-items: center; }

/* ---------- Tastierino dei numeri ---------- */
.keypad { display: grid; grid-template-columns: repeat(var(--keys, 5), minmax(0, 1fr)); gap: 6px; }
.keypad button { min-height: 52px; border: 1px solid #b8c9d0; border-radius: 10px; background: #fff; cursor: pointer;
  font: 800 1.35rem var(--sans); color: var(--navy); position: relative; }
.keypad button:hover { border-color: var(--navy); }
.keypad button.done { background: #eef2f3; color: #9db0ba; }
.keypad button small { position: absolute; right: 4px; bottom: 2px; font-size: .6rem; font-weight: 700; color: var(--muted); }
.keypad button.tool { font-size: .95rem; }
.keypad button.tool.on { background: var(--navy); border-color: var(--navy); color: #fff; }
.keypad button.tool.on small { color: #bcd7e2; }

/* ---------- Pannello del simulatore ---------- */
.sim-bar { display: flex; flex-wrap: wrap; align-items: center; gap: 8px 14px; padding: 8px 12px; background: #fff; border-radius: 10px; font-size: .9rem; font-weight: 700; color: var(--navy); }
.sim-bar b { font-variant-numeric: tabular-nums; }
.sim-bar .chip { padding: 2px 10px; border-radius: 99px; background: var(--paper); font-size: .78rem; letter-spacing: .04em; }
.sim-bar .grow { flex: 1; }
.sim-status { margin: 0; font-size: 1.35rem; }
.sim-status.over { color: var(--green); }
.sim-progress { height: 8px; border-radius: 9px; background: #e2e0d5; overflow: hidden; }
.sim-progress i { display: block; height: 100%; width: 0; background: var(--green); transition: width .3s; }

/* ---------- Spiegazione della mossa suggerita ---------- */
.why { margin: 0; padding: 12px 14px; background: #fff; border-left: 5px solid var(--blue); border-radius: 0 10px 10px 0; }
.why b { color: var(--navy); }
.why .tech-name { display: inline-block; margin-bottom: 4px; padding: 2px 10px; border-radius: 99px; background: var(--sky); font-size: .75rem; font-weight: 800; letter-spacing: .04em; text-transform: uppercase; color: var(--navy); }
.tech-list { display: grid; gap: 10px; margin: 0; padding: 0; list-style: none; }
.tech-list li { padding: 14px 16px; background: #fff; border: 1px solid var(--line); border-radius: 14px; }
.tech-list b { color: var(--navy); }
.tech-list p { margin: 4px 0 0; color: #4d6573; font-size: .95rem; }

/* ---------- Schema di esempio dentro le spiegazioni ---------- */
.mini-row { margin: 16px 0 26px; }
.mini > *, .exercise > *, .simulator > * { min-width: 0; }
.mini { display: grid; grid-template-columns: minmax(0, 420px) minmax(220px, 1fr); gap: clamp(16px, 3vw, 34px); align-items: center; margin: 0; }
.mini figcaption { font-size: .98rem; color: #3e5968; max-width: 460px; }
.mini figcaption b { color: var(--navy); }
.mini .board-frame { width: 100%; }
body.lim .mini { grid-template-columns: minmax(0, 520px) minmax(220px, 1fr); }
.keypad-box { display: grid; gap: 6px; }
.keypad.tools button { font-size: .95rem; }

/* Codice dello schema (per ritrovare lo stesso sudoku o usarlo in classe) */
.code-box { display: grid; gap: 6px; font-size: .78rem; font-weight: 800; text-transform: uppercase; letter-spacing: .06em; color: var(--muted); }
.code-box > div { display: flex; gap: 6px; }
.code-box input { flex: 1; min-width: 0; padding: 9px 10px; border: 1px solid #b8c9d0; border-radius: 8px;
  font: 800 .95rem Consolas, monospace; text-transform: uppercase; letter-spacing: .08em; color: var(--navy); }

/* ---------- Simulatore: griglia a sinistra, pannello a destra ---------- */
.simulator { display: grid; grid-template-columns: minmax(280px, 640px) minmax(280px, 1fr); gap: clamp(18px, 3vw, 36px); align-items: start;
  padding: clamp(14px, 2.5vw, 28px); background: var(--sky); border-radius: var(--radius); }
body.lim .simulator { grid-template-columns: minmax(300px, 760px) minmax(280px, 1fr); }
.sim-left { display: grid; gap: 10px; min-width: 0; align-content: start; }
.sim-panel { display: grid; gap: 14px; align-content: start; min-width: 0; padding: 22px; background: #fff; border-radius: var(--radius); }
.sim-toggles { display: grid; gap: 8px; }
.rule-reminder { margin: 0; padding: 10px 12px; background: var(--paper); border-radius: 8px; font-size: .85rem; color: var(--muted); }

/* ---------- Schermi piccoli ---------- */
@media (max-width: 1420px) {
  .simulator, body.lim .simulator { grid-template-columns: 1fr; }
  .simulator .sim-left, .simulator .sim-panel { max-width: 640px; width: 100%; margin: 0 auto; }
}
@media (max-width: 1150px) {
  .rule-cards, .priority-list, .exercise, body.lim .exercise, .mini, body.lim .mini { grid-template-columns: 1fr; }
  .exercise > *:first-child { max-width: 560px; width: 100%; margin: 0 auto; }
  .mini .board-frame { max-width: 520px; margin: 0 auto; }
}
@media (max-width: 900px) {
  .layout { grid-template-columns: 1fr; }
  .menu-toggle { display: block; }
  .stage-nav { position: fixed; top: var(--topbar); left: 0; z-index: 15; width: 290px; transform: translateX(-105%); transition: transform .2s; box-shadow: 10px 0 40px #062c5230; }
  body.nav-open .stage-nav { transform: none; }
  .hero, .two-col, .how-to { grid-template-columns: 1fr; }
  .hero-board { display: none; }
  .brand small { display: none; }
}
@media (max-width: 600px) {
  .topbar-actions .button:first-child { display: none; }
  .brand > span:last-child { font-size: .9rem; }
  .rule-cards, .rule-cards.three, .priority-list, .facts { grid-template-columns: 1fr; }
  .timeline::before { left: 8px; }
  .timeline li { grid-template-columns: 1fr; gap: 6px; padding-left: 30px; }
  .timeline li::before { left: 1px; top: 16px; }
  .timeline time { text-align: left; padding: 0; }
  .glossary { grid-template-columns: 1fr; gap: 0; }
  .site-footer { flex-direction: column; align-items: flex-start; gap: 6px; }
  .keypad button { min-height: 46px; font-size: 1.2rem; }
}
@media (prefers-reduced-motion: reduce) {
  html { scroll-behavior: auto; }
  *, *::before, *::after { animation: none !important; transition: none !important; }
}
/* A schermo intero la griglia deve poter diventare grande quanto lo schermo. */
.fs-game .board-frame { max-width: none !important; padding: 5px; border-radius: 10px; }
.fs-game .keypad button { min-height: 44px; font-size: 1.15rem; }
.fs-game .sim-bar { padding: 4px 10px; font-size: .8rem; }

/* ---------- Stampa (guida docente e pagine di teoria) ---------- */
@media print {
  .topbar, .stage-nav, .pager, .site-footer, [data-print], .widget, .quiz { display: none !important; }
  .layout { display: block; }
  main { padding: 0; }
  body { background: #fff; }
  .card.highlight { background: #fff; color: var(--ink); border: 2px solid var(--navy); }
  .card.highlight h2, .card.highlight p, .card.highlight li, .card.highlight b { color: var(--ink); }
}

/* Complimenti di fine schema, sopra la griglia (stessa veste del riquadro di scelta) */
.setup-card.win { justify-content: center; text-align: center; gap: 10px; }
.win-time { margin: 0; font: 700 clamp(2.4rem, 12vw, 4rem)/1 var(--serif); color: var(--yellow); letter-spacing: -.02em; }
.win-actions { display: grid; gap: 8px; margin-top: 6px; }
.setup-card.win .win-go { width: 100%; min-height: 50px; background: var(--yellow); color: var(--navy); font-size: 1rem; }
.setup-card.win .win-go:hover { background: #ffd978; }
.setup-card.win .win-close { width: 100%; background: transparent; border-color: #ffffff66; color: #fff; }
.setup-card.win .win-close:hover { border-color: #fff; background: #ffffff14; }

/* I riquadri sopra la griglia (scelta e complimenti) non si stringono oltre il leggibile:
   sulle griglie piccole restano larghi almeno 400px, centrati sullo schema. */
.board-frame > .setup-card { left: 50%; right: auto; transform: translateX(-50%); width: max(100%, 400px); }
.fs-overlay .board-frame > .setup-card { left: max(8px, env(safe-area-inset-left)); right: max(8px, env(safe-area-inset-right));
  transform: none; width: auto; }
@media (max-width: 460px) { .board-frame > .setup-card { width: 100%; left: 0; transform: none; } }