/* Sudoku STUDIO · stile del sito
   Layout: colonna centrale come la landing (crema, fasce navy, schede bianche),
   pensata prima per il telefono. Testo base 19px, pulsanti alti almeno 56px.
   Tema unico chiaro del brand: i colori sono sempre espliciti. */
/* Caratteri ospitati sul sito (licenza SIL Open Font License): nessuna richiesta a Google */
@font-face { font-family: "Poppins"; font-weight: 400; font-style: normal; font-display: swap; src: url("../fonts/poppins-400.woff") format("woff"); }
@font-face { font-family: "Poppins"; font-weight: 500; font-style: normal; font-display: swap; src: url("../fonts/poppins-500.woff") format("woff"); }
@font-face { font-family: "Poppins"; font-weight: 600 700; font-style: normal; font-display: swap; src: url("../fonts/poppins-700.woff") format("woff"); }
@font-face { font-family: "Lora"; font-weight: 600; font-style: normal; font-display: swap; src: url("../fonts/lora-600.woff") format("woff"); }
@font-face { font-family: "Lora"; font-weight: 700; font-style: normal; font-display: swap; src: url("../fonts/lora-700.woff") format("woff"); }

:root {
  --arancio: #FF6800;
  --navy: #1B3A6B;
  --ciano: #00FFFF;
  --crema: #F7F4F0;
  --inchiostro: #1C1A18;
  --bianco: #FFFFFF;
  --grigio: #57524B;        /* testo secondario, derivato dall'inchiostro */
  --bordo: #E3DCD2;         /* linee su crema */
  --crema-scuro: #EFE9E1;   /* celle date nelle griglie */
  --titoli: "Lora", Georgia, "Times New Roman", serif;
  --testo: "Poppins", "Segoe UI", Arial, sans-serif;
  --r: 16px;
  --ombra: 0 2px 12px rgba(27, 58, 107, .09);
  color-scheme: light;
}

*, *::before, *::after { box-sizing: border-box; }
[hidden] { display: none !important; }
html { -webkit-text-size-adjust: 100%; }
body {
  margin: 0; background: var(--crema); color: var(--inchiostro);
  font-family: var(--testo); font-size: 19px; line-height: 1.6;
}
img { max-width: 100%; height: auto; display: block; }
a { color: var(--navy); text-underline-offset: 3px; text-decoration-thickness: 2px; }
a:hover { color: var(--inchiostro); }
:focus-visible { outline: 3px solid var(--navy); outline-offset: 3px; border-radius: 6px; }
h1, h2, h3 { font-family: var(--titoli); color: var(--navy); line-height: 1.2; margin: 0; text-wrap: balance; font-weight: 700; }
h1 { font-size: clamp(1.9rem, 6vw, 2.6rem); }
h2 { font-size: clamp(1.5rem, 4.6vw, 1.95rem); }
h3 { font-size: 1.25rem; }
p { margin: 0; }
.maiusc { text-transform: uppercase; letter-spacing: .02em; }
.salta { position: absolute; left: -999px; top: 0; background: var(--navy); color: var(--bianco); padding: 12px 18px; z-index: 10; }
.salta:focus { left: 12px; top: 12px; }

.contenitore { max-width: 820px; margin: 0 auto; padding-inline: 20px; }
.largo { max-width: 1080px; }
main { display: block; }
.sezione { padding-block: 40px; }
.pila { display: grid; gap: 18px; }
.pila-s { display: grid; gap: 10px; }
.centro { text-align: center; }
.sotto { color: var(--grigio); }
.piccolo { font-size: .88rem; }

/* Avviso browser interno Instagram / Facebook */
.avviso-app { background: var(--navy); color: var(--bianco); text-align: center; padding: 14px 18px; font-weight: 500; font-size: 1rem; }
.avviso-app strong { color: var(--ciano); }

/* Testata */
.testata { background: var(--crema); border-bottom: 1px solid var(--bordo); }
.testata .contenitore { display: flex; flex-wrap: wrap; align-items: center; justify-content: space-between; gap: 12px 24px; padding-block: 14px; }
.logo img { width: 170px; }
.menu { display: flex; flex-wrap: wrap; gap: 8px; }
.menu a {
  display: inline-flex; align-items: center; min-height: 48px; padding: 8px 16px; border-radius: 999px;
  text-decoration: none; font-weight: 600; font-size: 1rem; color: var(--navy); background: var(--bianco);
  border: 2px solid var(--bordo);
}
.menu a:hover { border-color: var(--navy); color: var(--navy); }
.menu a[aria-current="page"] { background: var(--navy); border-color: var(--navy); color: var(--bianco); }
@media (max-width: 620px) {
  .testata .contenitore { justify-content: center; }
  .logo img { width: 190px; }
  .menu { display: grid; grid-template-columns: 1fr 1fr; width: 100%; }
  .menu a { justify-content: center; }
}

/* Pulsanti */
.btn {
  display: inline-flex; align-items: center; justify-content: center; gap: 10px; flex-wrap: wrap;
  min-height: 56px; padding: 12px 26px; border-radius: 999px; border: 2px solid transparent;
  font: 700 1.05rem/1.2 var(--testo); text-decoration: none; text-align: center; cursor: pointer;
  transition: transform .1s ease;
}
.btn:active { transform: scale(.98); }
.btn small { font-weight: 500; font-size: .85rem; }
.btn-arancio { background: var(--arancio); color: var(--inchiostro); box-shadow: 0 4px 14px rgba(255, 104, 0, .3); }
.btn-arancio:hover { color: var(--inchiostro); box-shadow: 0 0 0 4px rgba(255, 104, 0, .25); }
.btn-navy { background: var(--navy); color: var(--bianco); }
.btn-navy:hover { color: var(--bianco); box-shadow: 0 0 0 4px rgba(27, 58, 107, .2); }
.btn-bordo { background: var(--bianco); color: var(--navy); border-color: var(--navy); }
.btn-bordo:hover { color: var(--navy); background: var(--crema); }
.btn-ciano { background: var(--ciano); color: var(--navy); }
.btn-ciano:hover { color: var(--navy); box-shadow: 0 0 0 4px rgba(0, 255, 255, .3); }
.btn-spento { background: transparent; color: var(--grigio); border: 2px dashed #B9B1A6; cursor: default; box-shadow: none; }
.btn-blocco { display: flex; width: 100%; }
.azioni { display: flex; flex-wrap: wrap; gap: 12px; }

/* Apertura pagina */
.apertura { padding-block: 36px 28px; }
.apertura .pila { max-width: 640px; }
.occhiello { font-size: .85rem; font-weight: 700; letter-spacing: .12em; text-transform: uppercase; color: var(--navy); }
.sottolinea { display: block; width: 64px; height: 4px; background: var(--arancio); border-radius: 2px; }
.intro { font-size: 1.12rem; color: var(--inchiostro); }

/* Fascia navy (collana, regalo) */
.fascia { background: var(--navy); color: var(--bianco); }
.fascia h2, .fascia h3 { color: var(--bianco); }
.fascia .sotto { color: #DCE3EE; }
.fascia .linea-ciano { display: block; width: 72px; height: 4px; background: var(--ciano); border-radius: 2px; }
.fascia a:not(.btn) { color: var(--bianco); }
.collana-img { border-radius: 12px; margin-inline: auto; }

/* Schede libro */
.libri { display: grid; gap: 18px; }
.libro {
  display: grid; grid-template-columns: 96px minmax(0, 1fr); gap: 14px 18px; align-items: start;
  background: var(--bianco); border-radius: var(--r); padding: 18px; box-shadow: var(--ombra);
}
.libro .copertina { border-radius: 6px; box-shadow: 0 2px 8px rgba(0, 0, 0, .15); }
.libro h3 { display: flex; align-items: center; gap: 10px; font-size: 1.22rem; }
.libro h3 a { color: var(--navy); text-decoration: none; }
.libro h3 a:hover { text-decoration: underline; }
.pallino { width: 14px; height: 14px; border-radius: 50%; flex: none; box-shadow: 0 0 0 2px var(--bianco), 0 0 0 3px rgba(0,0,0,.12); }
.libro .motto { font-weight: 600; color: var(--inchiostro); }
.libro .fatti-brevi { color: var(--grigio); font-size: .95rem; }
.formati { display: grid; grid-template-columns: repeat(auto-fit, minmax(170px, 1fr)); gap: 10px; margin-top: 4px; }
.formati .btn { min-height: 52px; padding: 10px 16px; font-size: 1rem; flex-direction: column; gap: 0; }
.link-scheda { font-weight: 600; font-size: .98rem; }
.libro-azioni { grid-column: 1 / -1; }
@media (min-width: 700px) {
  .libro { grid-template-columns: 150px minmax(0, 1fr); gap: 12px 26px; padding: 22px; }
  .libro-cop { grid-row: span 2; }
  .libro-azioni { grid-column: 2; }
}
.sr { position: absolute; width: 1px; height: 1px; overflow: hidden; clip: rect(0 0 0 0); white-space: nowrap; }

/* Scheda singolo libro */
.scheda { display: grid; grid-template-columns: minmax(0, 1fr); gap: 28px; align-items: start; }
.scheda .copertina-grande { max-width: 340px; margin-inline: auto; border-radius: 8px; box-shadow: 0 10px 30px rgba(0, 0, 0, .18); }
@media (min-width: 760px) { .scheda { grid-template-columns: 300px minmax(0, 1fr); gap: 40px; } }
.elenco-fatti { list-style: none; padding: 0; margin: 0; display: grid; gap: 10px; }
.elenco-fatti li { display: grid; grid-template-columns: 28px minmax(0, 1fr); gap: 10px; align-items: start; }
.elenco-fatti li::before { content: ""; width: 22px; height: 22px; margin-top: 4px; border-radius: 50%; background: var(--arancio) url("data:image/svg+xml,%3Csvg xmlns='http://www.w3.org/2000/svg' viewBox='0 0 24 24'%3E%3Cpath d='M6 12.5l4 4 8-9' fill='none' stroke='%231C1A18' stroke-width='3' stroke-linecap='round' stroke-linejoin='round'/%3E%3C/svg%3E") center/16px no-repeat; }
.scelta-formato { background: var(--bianco); border-radius: var(--r); padding: 20px; box-shadow: var(--ombra); display: grid; gap: 12px; }
.scelta-formato h2 { font-size: 1.25rem; }

/* Riquadri bianchi generici */
.riquadro { background: var(--bianco); border-radius: var(--r); padding: 24px; box-shadow: var(--ombra); }
.tratteggio { background: var(--bianco); border: 2px dashed var(--arancio); border-radius: var(--r); padding: 26px 22px; }
.accessi { display: grid; grid-template-columns: repeat(auto-fit, minmax(230px, 1fr)); gap: 16px; }
.accesso { display: grid; gap: 8px; align-content: start; background: var(--bianco); border-radius: var(--r); padding: 22px; box-shadow: var(--ombra); text-decoration: none; color: var(--inchiostro); border: 2px solid transparent; }
.accesso:hover { border-color: var(--navy); color: var(--inchiostro); }
.accesso h3 { font-size: 1.2rem; }
.accesso .vai { font-weight: 700; color: var(--navy); }

/* Moduli */
.modulo { display: grid; gap: 16px; }
.campo { display: grid; gap: 6px; }
.campo label { font-weight: 600; }
.campo input {
  font: inherit; min-height: 56px; padding: 10px 16px; width: 100%;
  border: 2px solid #C9C1B6; border-radius: 12px; background: var(--bianco); color: var(--inchiostro);
}
.campo input:focus { outline: none; border-color: var(--navy); box-shadow: 0 0 0 3px rgba(27, 58, 107, .2); }
.consenso { display: grid; grid-template-columns: 30px minmax(0, 1fr); gap: 10px; align-items: start; font-size: .95rem; }
.consenso input { width: 26px; height: 26px; margin: 2px 0 0; accent-color: var(--navy); }
.esito { border-radius: 12px; padding: 16px 18px; font-weight: 500; }
.esito.errore { background: #FFF1EC; border: 2px solid #C4410F; color: var(--inchiostro); }
.esito.ok { background: var(--bianco); border: 2px solid var(--navy); }
.scarica { display: grid; gap: 14px; }

/* Griglie sudoku */
.griglia {
  border-collapse: collapse; margin-inline: auto; background: var(--bianco);
  border: 4px solid var(--navy); table-layout: fixed; width: 100%; max-width: 540px;
}
.griglia td {
  width: 11.11%; height: min(calc((100vw - 48px) / 9), 60px); text-align: center; vertical-align: middle; padding: 0;
  border: 1px solid #B8C2D3; font: 400 clamp(1.3rem, 6vw, 2.1rem)/1 var(--testo); color: var(--inchiostro);
  font-variant-numeric: tabular-nums;
}
.griglia td.d { font-weight: 700; color: var(--navy); background: var(--crema-scuro); }
.griglia tr:nth-child(3n) td { border-bottom: 3px solid var(--navy); }
.griglia td:nth-child(3n) { border-right: 3px solid var(--navy); }
.griglia td.ev { background: #FFE3CF; }
.griglia td.bersaglio { background: var(--arancio); color: var(--inchiostro); font-weight: 700; }
.griglia td.chiave { box-shadow: inset 0 0 0 3px var(--navy); }
.griglia-piccola { max-width: 380px; }
.griglia-piccola td { font-size: clamp(1rem, 4.4vw, 1.5rem); height: min(calc((100vw - 48px) / 9), 42px); }
.legenda { display: grid; gap: 8px; max-width: 540px; margin: 12px auto 0; font-size: .95rem; color: var(--grigio); }
.legenda span { display: inline-flex; align-items: center; gap: 8px; }
.legenda i { flex: none; width: 22px; height: 22px; border: 1px solid #B8C2D3; display: inline-block; }
.striscia { display: flex; justify-content: center; margin: 8px auto; }
.striscia span { width: 44px; height: 44px; display: grid; place-items: center; background: var(--bianco); border: 1px solid #B8C2D3; font: 700 1.35rem var(--testo); color: var(--navy); }
.striscia span:first-child { border-left-width: 3px; border-left-color: var(--navy); }
.striscia span:last-child { border-right-width: 3px; border-right-color: var(--navy); }
.striscia span { border-top: 3px solid var(--navy); border-bottom: 3px solid var(--navy); }
.striscia span.q { background: var(--arancio); color: var(--inchiostro); }
.striscia.verticale { flex-direction: column; align-items: center; }
.striscia.verticale span { border: 1px solid #B8C2D3; border-left: 3px solid var(--navy); border-right: 3px solid var(--navy); }
.striscia.verticale span:first-child { border-top: 3px solid var(--navy); }
.striscia.verticale span:last-child { border-bottom: 3px solid var(--navy); }
@media (max-width: 420px) { .striscia span { width: 36px; height: 36px; font-size: 1.15rem; } }
.box3 { display: grid; grid-template-columns: repeat(3, 56px); margin: 8px auto; width: max-content; border: 3px solid var(--navy); }
.box3 span { height: 56px; display: grid; place-items: center; border: 1px solid #B8C2D3; background: var(--bianco); font: 700 1.5rem var(--testo); color: var(--navy); }
.box3 span.q { background: var(--arancio); color: var(--inchiostro); }
details.risposta { background: var(--bianco); border-radius: 12px; border: 2px solid var(--bordo); }
details.risposta summary { cursor: pointer; padding: 14px 18px; font-weight: 700; color: var(--navy); min-height: 52px; }
details.risposta > div { padding: 0 18px 16px; }

/* Soluzioni */
.numeri { display: grid; grid-template-columns: repeat(auto-fill, minmax(62px, 1fr)); gap: 10px; }
.numeri a { display: grid; place-items: center; min-height: 58px; border-radius: 12px; background: var(--bianco); border: 2px solid var(--bordo); text-decoration: none; font-weight: 700; font-size: 1.1rem; color: var(--navy); font-variant-numeric: tabular-nums; }
.numeri a:hover { border-color: var(--navy); }
.etichetta { display: inline-flex; align-items: center; gap: 8px; padding: 4px 14px; border-radius: 999px; background: var(--bianco); border: 2px solid var(--bordo); font-weight: 600; font-size: .95rem; }
.sfoglia { display: grid; grid-template-columns: 1fr 1fr; gap: 12px; }
.vai-numero { display: flex; flex-wrap: wrap; gap: 10px; align-items: end; }
.vai-numero .campo input { width: 8rem; }

/* Articoli */
.articolo { display: grid; gap: 18px; max-width: 680px; }
.articolo h2 { margin-top: 18px; }
.articolo h3 { margin-top: 8px; }
.articolo ul, .articolo ol { margin: 0; padding-left: 1.3em; display: grid; gap: 6px; }
.articolo figure { margin: 8px 0; display: grid; gap: 8px; }
.articolo figcaption { text-align: center; color: var(--grigio); font-size: .95rem; }
.briciole { font-size: .95rem; color: var(--grigio); }
.briciole a { color: var(--grigio); }
.elenco-articoli { display: grid; gap: 14px; }
.elenco-articoli a { display: grid; gap: 4px; background: var(--bianco); border-radius: var(--r); padding: 20px 22px; box-shadow: var(--ombra); text-decoration: none; color: var(--inchiostro); border: 2px solid transparent; }
.elenco-articoli a:hover { border-color: var(--navy); color: var(--inchiostro); }
.elenco-articoli strong { font-family: var(--titoli); font-size: 1.25rem; color: var(--navy); }
.promo-libro { display: grid; grid-template-columns: 96px minmax(0, 1fr); gap: 18px; align-items: center; }

/* Piè di pagina */
.piede { background: var(--navy); color: var(--bianco); padding-block: 40px 48px; margin-top: 24px; }
.piede .contenitore { display: grid; gap: 22px; }
.piede img { width: 170px; }
.piede nav { display: flex; flex-wrap: wrap; gap: 8px 22px; }
.piede a { color: var(--bianco); font-weight: 500; }
.piede .linea-ciano { display: block; width: 72px; height: 4px; background: var(--ciano); border-radius: 2px; }
.piede p { color: #DCE3EE; font-size: .95rem; }
.piede .newsletter { display: grid; gap: 12px; background: rgba(255, 255, 255, .06); border-radius: var(--r); padding: 20px; }
.piede .newsletter strong { font-family: var(--titoli); font-size: 1.25rem; color: var(--bianco); }

@media (prefers-reduced-motion: reduce) { .btn { transition: none; } }