/* Archimede AI — sito di presentazione. Stile sobrio alla Apple: font di sistema, molto spazio, un solo accento. */
:root {
  --sfondo: #fbfbfd;
  --sfondo-2: #f5f5f7;
  --testo: #1d1d1f;
  --testo-2: #6e6e73;
  --linea: rgba(0, 0, 0, 0.1);
  --accento: #0b7d72;
  --accento-chiaro: #0f9d8f;
  --barra: rgba(251, 251, 253, 0.78);
  --cornice: #1d1d1f;
  --ombra: 0 30px 60px -20px rgba(0, 0, 0, 0.25), 0 18px 36px -18px rgba(0, 0, 0, 0.2);
  --raggio: 22px;
  color-scheme: light;
}
@media (prefers-color-scheme: dark) {
  :root:not([data-tema="chiaro"]) {
    --sfondo: #000;
    --sfondo-2: #111113;
    --testo: #f5f5f7;
    --testo-2: #a1a1a6;
    --linea: rgba(255, 255, 255, 0.14);
    --accento: #2dd4bf;
    --accento-chiaro: #5eead4;
    --barra: rgba(0, 0, 0, 0.72);
    --cornice: #3a3a3c;
    --ombra: 0 30px 70px -20px rgba(45, 212, 191, 0.18), 0 18px 36px -18px rgba(0, 0, 0, 0.8);
    color-scheme: dark;
  }
}
:root[data-tema="scuro"] {
  --sfondo: #000;
  --sfondo-2: #111113;
  --testo: #f5f5f7;
  --testo-2: #a1a1a6;
  --linea: rgba(255, 255, 255, 0.14);
  --accento: #2dd4bf;
  --accento-chiaro: #5eead4;
  --barra: rgba(0, 0, 0, 0.72);
  --cornice: #3a3a3c;
  --ombra: 0 30px 70px -20px rgba(45, 212, 191, 0.18), 0 18px 36px -18px rgba(0, 0, 0, 0.8);
  color-scheme: dark;
}

* { box-sizing: border-box; margin: 0; padding: 0; }
html { scroll-behavior: smooth; scroll-padding-top: 64px; -webkit-text-size-adjust: 100%; }
body {
  font-family: -apple-system, BlinkMacSystemFont, "SF Pro Text", "SF Pro Display", "Inter", "Helvetica Neue", Arial, sans-serif;
  background: var(--sfondo);
  color: var(--testo);
  font-size: 17px;
  line-height: 1.5;
  letter-spacing: -0.01em;
  -webkit-font-smoothing: antialiased;
  overflow-x: hidden;
  transition: background-color .3s ease, color .3s ease;
}
img, video { display: block; max-width: 100%; }
a { color: var(--accento); text-decoration: none; }
a:hover { text-decoration: underline; }
:focus-visible { outline: 3px solid var(--accento); outline-offset: 3px; border-radius: 6px; }

.salta { position: absolute; inset-inline-start: 8px; top: 8px; transform: translateY(-300%); background: var(--testo); color: var(--sfondo); padding: 8px 14px; border-radius: 8px; z-index: 100; }
.salta:focus { transform: none; }

/* ---------- Barra in alto ---------- */
.barra {
  position: sticky; top: 0; z-index: 50;
  background: var(--barra);
  -webkit-backdrop-filter: saturate(180%) blur(20px);
  backdrop-filter: saturate(180%) blur(20px);
  border-bottom: 1px solid var(--linea);
}
.barra-in { max-width: 1080px; margin: 0 auto; height: 52px; padding: 0 16px; display: flex; align-items: center; justify-content: space-between; gap: 12px; }
.marchio { display: flex; align-items: center; gap: 8px; color: var(--testo); font-weight: 600; font-size: 16px; letter-spacing: -0.02em; }
.marchio:hover { text-decoration: none; }
.marchio img { border-radius: 7px; }
.voci { display: flex; align-items: center; gap: 2px; }
.voce {
  appearance: none; background: none; border: 0; cursor: pointer;
  color: var(--testo); font: inherit; font-size: 14px; opacity: .85;
  padding: 8px 10px; border-radius: 8px; display: inline-flex; align-items: center; gap: 5px; min-height: 36px;
}
.voce:hover { opacity: 1; text-decoration: none; background: var(--linea); }
.voce svg { transition: transform .25s ease; }
.voce[aria-expanded="true"] svg { transform: rotate(180deg); }
.tema .luna { display: none; }
:root[data-tema="scuro"] .tema .sole { display: none; }
:root[data-tema="scuro"] .tema .luna { display: block; }
@media (prefers-color-scheme: dark) {
  :root:not([data-tema="chiaro"]) .tema .sole { display: none; }
  :root:not([data-tema="chiaro"]) .tema .luna { display: block; }
}
.pillola {
  margin-left: 6px; background: var(--accento); color: #fff; font-size: 13px; font-weight: 500;
  padding: 6px 14px; border-radius: 980px; white-space: nowrap;
}
:root[data-tema="scuro"] .pillola { color: #00211d; }
@media (prefers-color-scheme: dark) { :root:not([data-tema="chiaro"]) .pillola { color: #00211d; } }
.pillola:hover { text-decoration: none; filter: brightness(1.08); }

/* Tendina delle funzioni: si apre sotto la barra, a tutta larghezza come su apple.com */
.tendina { position: static; }
.menu {
  position: absolute; left: 0; right: 0; top: 52px;
  background: var(--sfondo);
  border-bottom: 1px solid var(--linea);
  box-shadow: 0 0 0 100vmax rgba(0,0,0,.28);
  clip-path: inset(0 0 -100vh 0);
  animation: scendi .28s cubic-bezier(.2,.8,.2,1);
  max-height: calc(100vh - 52px); overflow-y: auto;
}
.menu[hidden] { display: none; }
@keyframes scendi { from { opacity: 0; transform: translateY(-8px); } to { opacity: 1; transform: none; } }
.menu-griglia { max-width: 1080px; margin: 0 auto; padding: 28px 16px 36px; display: grid; grid-template-columns: repeat(4, 1fr); gap: 28px; }
.menu-titolo { font-size: 12px; color: var(--testo-2); margin-bottom: 10px; letter-spacing: 0; }
.menu-col a { display: block; color: var(--testo); font-size: 15px; font-weight: 500; padding: 6px 0; letter-spacing: -0.015em; }
.menu-col a:hover { color: var(--accento); text-decoration: none; }

/* ---------- Tipografia comune ---------- */
.occhiello { color: var(--accento); font-size: 15px; font-weight: 600; letter-spacing: 0; margin-bottom: 10px; }
h1, h2 { font-family: -apple-system, BlinkMacSystemFont, "SF Pro Display", "Inter", "Helvetica Neue", Arial, sans-serif; letter-spacing: -0.035em; font-weight: 700; line-height: 1.06; }
h1 { font-size: clamp(44px, 6.4vw, 76px); }
h2 { font-size: clamp(32px, 4.6vw, 52px); margin-bottom: 18px; }
.sfumato { background: linear-gradient(90deg, var(--accento), #3b82f6 70%); -webkit-background-clip: text; background-clip: text; color: transparent; }
.sottotitolo { font-size: clamp(19px, 2vw, 22px); color: var(--testo-2); line-height: 1.4; max-width: 38ch; margin-top: 20px; letter-spacing: -0.015em; }
.largo { max-width: 760px; margin: 0 auto; text-align: center; padding: 0 16px; }
.intro { font-size: 19px; color: var(--testo-2); line-height: 1.45; }

/* ---------- Hero ---------- */
.hero { max-width: 1080px; margin: 0 auto; padding: 72px 16px 96px; display: grid; grid-template-columns: 1.35fr .65fr; gap: 48px; align-items: center; }
.negozi { display: flex; flex-wrap: wrap; gap: 12px; margin-top: 32px; }
.negozi.centro { justify-content: center; }
.negozio {
  display: inline-flex; align-items: center; gap: 10px;
  background: #000; color: #fff; border: 1px solid #000;
  padding: 9px 20px 9px 16px; border-radius: 13px; min-height: 56px;
  transition: transform .2s ease, box-shadow .2s ease;
}
:root[data-tema="scuro"] .negozio { border-color: rgba(255,255,255,.35); }
@media (prefers-color-scheme: dark) { :root:not([data-tema="chiaro"]) .negozio { border-color: rgba(255,255,255,.35); } }
.negozio:hover { text-decoration: none; transform: translateY(-2px); box-shadow: 0 10px 24px -10px rgba(0,0,0,.45); }
.negozio span { display: flex; flex-direction: column; font-size: 21px; font-weight: 600; line-height: 1.05; letter-spacing: -0.02em; }
.negozio small { font-size: 11px; font-weight: 500; letter-spacing: 0; opacity: .9; }
.nota-negozi { margin-top: 14px; font-size: 14px; color: var(--testo-2); }
.hero-telefono { display: flex; flex-direction: column; align-items: center; }
.didascalia { margin-top: 18px; font-size: 14px; color: var(--testo-2); text-align: center; }

/* ---------- Cornice telefono ---------- */
.telefono {
  position: relative; background: var(--cornice);
  border-radius: 38px; padding: 9px;
  box-shadow: var(--ombra);
  aspect-ratio: 860 / 1864;
  width: 100%;
}
.telefono img, .telefono video { width: 100%; height: 100%; object-fit: cover; border-radius: 30px; background: #000; }
.telefono.grande { max-width: 340px; }

/* ---------- Metodo ---------- */
.metodo { background: var(--sfondo-2); padding: 110px 0 120px; }
.passi { list-style: none; max-width: 1080px; margin: 56px auto 0; padding: 0 16px; display: grid; grid-template-columns: repeat(4, 1fr); gap: 16px; }
.passi li { background: var(--sfondo); border-radius: var(--raggio); padding: 28px 24px; display: flex; flex-direction: column; gap: 8px; }
.passi strong { font-size: 21px; letter-spacing: -0.02em; }
.passi li > span:last-child { color: var(--testo-2); font-size: 15px; line-height: 1.45; }
.passo-n { width: 32px; height: 32px; border-radius: 50%; display: grid; place-items: center; background: var(--accento); color: #fff; font-weight: 700; font-size: 15px; margin-bottom: 6px; }
:root[data-tema="scuro"] .passo-n { color: #00211d; }
@media (prefers-color-scheme: dark) { :root:not([data-tema="chiaro"]) .passo-n { color: #00211d; } }

/* ---------- Funzioni ---------- */
.funzioni { max-width: 1080px; margin: 0 auto; padding: 40px 16px; }
.funzione { display: grid; grid-template-columns: 1fr 1fr; gap: 72px; align-items: center; padding: 96px 0; border-bottom: 1px solid var(--linea); }
.funzione:last-child { border-bottom: 0; }
.funzione:nth-child(even) .f-testo { order: 2; }
.funzione:nth-child(even) .f-immagini { order: 1; }
.f-testo p { color: var(--testo-2); font-size: 17px; line-height: 1.55; margin-top: 12px; max-width: 46ch; }
.f-testo .occhiello { margin-top: 0; color: var(--accento); }
.f-testo .cosa { color: var(--testo); font-size: 19px; line-height: 1.45; letter-spacing: -0.015em; }
.f-testo .cosa strong { color: var(--accento); font-weight: 600; }
.f-immagini { display: flex; justify-content: center; align-items: flex-start; gap: 20px; }
.f-immagini.uno .telefono { max-width: 300px; }
.f-immagini.due .telefono { max-width: 250px; }
.f-immagini.due .telefono:nth-child(2) { margin-top: 48px; }
.f-immagini.quattro { display: grid; grid-template-columns: repeat(2, 1fr); gap: 18px; justify-items: center; }
.f-immagini.quattro .telefono { max-width: 200px; border-radius: 30px; padding: 7px; }
.f-immagini.quattro .telefono img { border-radius: 24px; }
.f-immagini.quattro .telefono:nth-child(even) { margin-top: 36px; }

/* ---------- Chiusura e piede ---------- */
.chiusura { padding: 120px 0 130px; background: var(--sfondo-2); }
.logo-grande { margin: 0 auto 28px; border-radius: 22px; box-shadow: var(--ombra); }
.piede { border-top: 1px solid var(--linea); }
.piede-in { max-width: 1080px; margin: 0 auto; padding: 22px 16px 32px; display: flex; justify-content: space-between; flex-wrap: wrap; gap: 8px; font-size: 13px; color: var(--testo-2); }

/* ---------- Comparsa allo scorrimento (solo se il movimento è permesso) ---------- */
@media (prefers-reduced-motion: no-preference) {
  .js .appare { opacity: 0; transform: translateY(32px); transition: opacity .9s cubic-bezier(.2,.8,.2,1), transform .9s cubic-bezier(.2,.8,.2,1); }
  .js .appare.vista { opacity: 1; transform: none; }
}
@media (prefers-reduced-motion: reduce) {
  html { scroll-behavior: auto; }
  .menu { animation: none; }
}

/* ---------- Tablet e telefono ---------- */
@media (max-width: 900px) {
  .hero { grid-template-columns: 1fr; text-align: center; padding-top: 48px; gap: 48px; }
  .sottotitolo { margin-left: auto; margin-right: auto; }
  .negozi { justify-content: center; }
  .passi { grid-template-columns: repeat(2, 1fr); }
  .funzione { grid-template-columns: 1fr; gap: 40px; padding: 72px 0; text-align: center; }
  .funzione:nth-child(even) .f-testo, .funzione:nth-child(even) .f-immagini { order: 0; }
  .f-testo p { margin-left: auto; margin-right: auto; }
  .menu-griglia { grid-template-columns: repeat(2, 1fr); gap: 24px; }
  .nascondi-mobile { display: none; }
}
@media (max-width: 560px) {
  body { font-size: 16px; }
  .marchio span { display: none; }
  .passi { grid-template-columns: 1fr; }
  .f-immagini.due { gap: 12px; }
  .f-immagini.due .telefono { max-width: 46%; border-radius: 28px; padding: 6px; }
  .f-immagini.due .telefono img { border-radius: 23px; }
  .f-immagini.due .telefono:nth-child(2) { margin-top: 32px; }
  .f-immagini.uno .telefono { max-width: 250px; }
  .telefono.grande { max-width: 290px; }
  .f-immagini.quattro { gap: 12px; }
  .f-immagini.quattro .telefono { border-radius: 24px; padding: 5px; }
  .f-immagini.quattro .telefono img { border-radius: 20px; }
  .menu-griglia { grid-template-columns: 1fr 1fr; padding: 20px 16px 28px; gap: 18px 16px; }
  .menu-col a { font-size: 15px; padding: 7px 0; }
  .negozio { padding: 8px 16px 8px 13px; min-height: 52px; }
  .negozio span { font-size: 18px; }
}

/* ---------- Lingue ---------- */
.tendina-lingua { position: relative; }
#sigla-lingua { font-size: 12px; font-weight: 600; letter-spacing: .02em; }
.menu-lingue {
  position: absolute; top: calc(100% + 8px); inset-inline-end: 0; z-index: 60;
  list-style: none; min-width: 180px; padding: 6px;
  background: var(--sfondo); border: 1px solid var(--linea); border-radius: 14px;
  box-shadow: 0 18px 40px -12px rgba(0,0,0,.3);
  animation: scendi .22s cubic-bezier(.2,.8,.2,1);
}
.menu-lingue[hidden] { display: none; }
.menu-lingue button {
  appearance: none; background: none; border: 0; width: 100%; text-align: start; cursor: pointer;
  font: inherit; font-size: 15px; color: var(--testo); padding: 9px 12px; border-radius: 9px; min-height: 40px;
  display: flex; align-items: center; justify-content: space-between; gap: 12px;
}
.menu-lingue button:hover { background: var(--sfondo-2); }
.menu-lingue button[aria-checked="true"] { color: var(--accento); font-weight: 600; }
.menu-lingue button[aria-checked="true"]::after { content: "✓"; }
/* scritture che non sopportano la spaziatura negativa (arabo: le lettere si staccano) e con segni sopra e sotto la riga */
html:is([lang="ar"], [lang="hi"], [lang="zh"], [lang="ja"], [lang="ko"]) * { letter-spacing: 0 !important; }
html:is([lang="ar"], [lang="hi"]) :is(h1, h2) { line-height: 1.3; }
html:is([lang="ar"], [lang="hi"]) body { line-height: 1.7; }
html:is([lang="zh"], [lang="ja"], [lang="ko"]) :is(h1, h2) { line-height: 1.25; }
html:is([lang="ja"], [lang="ko"]) h1 { word-break: keep-all; }
/* da destra a sinistra: l'icona della tendina e i giri di pagina seguono la direzione */
[dir="rtl"] .sfumato { background: linear-gradient(270deg, var(--accento), #3b82f6 70%); -webkit-background-clip: text; background-clip: text; }
@media (max-width: 560px) { #sigla-lingua { display: none; } }

/* ---------- Pulsante play sul video (stile YouTube): fa capire subito che è un video ---------- */
.hero-telefono .telefono { position: relative; }
.play {
  position: absolute; top: 50%; left: 50%; transform: translate(-50%, -50%);
  appearance: none; border: 0; background: none; padding: 0; cursor: pointer; z-index: 3;
  filter: drop-shadow(0 6px 18px rgba(0,0,0,.35)); transition: transform .2s ease, opacity .2s ease;
}
.play svg { width: 88px; height: auto; display: block; }
.play-fondo { fill: #ff0033; fill-opacity: .92; transition: fill-opacity .2s ease; }
.play:hover { transform: translate(-50%, -50%) scale(1.06); }
.play:hover .play-fondo { fill-opacity: 1; }
.play[hidden] { display: none; }
@media (max-width: 560px) { .play svg { width: 72px; } }

/* ---------- Tab DSA nel menu: sempre visibile, anche su telefono ---------- */
.voce-dsa { font-weight: 600; color: var(--accento); opacity: 1; border: 1px solid color-mix(in srgb, var(--accento) 45%, transparent); border-radius: 980px; padding: 4px 11px; min-height: 30px; margin-inline: 4px; }
.voce-dsa:hover { background: color-mix(in srgb, var(--accento) 12%, transparent); }

/* ---------- Prezzi ---------- */
.prezzi { padding: 110px 0 120px; }
.piani { max-width: 1080px; margin: 56px auto 0; padding: 0 16px; display: grid; grid-template-columns: repeat(3, 1fr); gap: 18px; align-items: stretch; }
.piano { position: relative; background: var(--sfondo-2); border-radius: var(--raggio); padding: 32px 26px 28px; display: flex; flex-direction: column; gap: 6px; border: 1px solid transparent; }
.piano-evidenza { border-color: var(--accento); background: var(--sfondo); box-shadow: var(--ombra); }
.piano-badge { position: absolute; top: -12px; inset-inline-start: 26px; background: var(--accento); color: #fff; font-size: 12px; font-weight: 600; padding: 4px 10px; border-radius: 980px; }
:root[data-tema="scuro"] .piano-badge { color: #00211d; }
.piano h3 { font-size: 24px; letter-spacing: -0.02em; }
.piano-per { color: var(--accento); font-weight: 600; font-size: 15px; }
.piano-desc { color: var(--testo-2); font-size: 15px; line-height: 1.5; margin-top: 4px; }
.piano-prezzo { display: flex; flex-direction: column; margin: 18px 0 14px; padding: 16px 0; border-top: 1px solid var(--linea); border-bottom: 1px solid var(--linea); }
.piano-prova { font-size: 14px; font-weight: 600; color: var(--accento); }
.piano-poi { font-size: 17px; margin-top: 2px; }
.piano-poi strong { font-size: 34px; letter-spacing: -0.03em; }
.piano-mese { font-size: 13px; color: var(--testo-2); }
.piano-voci { list-style: none; display: flex; flex-direction: column; gap: 9px; font-size: 15px; margin-bottom: 22px; flex: 1; }
.piano-voci li { padding-inline-start: 24px; position: relative; }
.piano-voci li::before { content: "✓"; position: absolute; inset-inline-start: 0; color: var(--accento); font-weight: 700; }
.piano-cta { display: block; text-align: center; background: var(--testo); color: var(--sfondo); padding: 12px 16px; border-radius: 980px; font-weight: 600; font-size: 15px; }
.piano-evidenza .piano-cta { background: var(--accento); color: #fff; }
.piano-cta:hover { text-decoration: none; filter: brightness(1.08); }
.amici-prezzi { max-width: 720px; margin: 36px auto 0; padding: 0 16px; text-align: center; color: var(--testo-2); font-size: 15px; }
.amici-prezzi strong { color: var(--testo); display: block; margin-bottom: 4px; font-size: 17px; }
@media (max-width: 900px) { .piani { grid-template-columns: 1fr; max-width: 460px; } }
@media (max-width: 560px) { .voce-dsa { padding: 3px 9px; font-size: 13px; margin-inline: 2px; } }
@media (prefers-color-scheme: dark) { :root:not([data-tema="chiaro"]) .piano-badge { color: #00211d; } }
/* il logo non si deve schiacciare quando la barra è piena (lingue con parole lunghe, tab DSA) */
.marchio, .marchio img { flex-shrink: 0; }
@media (max-width: 560px) { .barra-in { gap: 6px; } .voci { gap: 0; min-width: 0; } .pillola { padding: 6px 11px; margin-left: 2px; } .voce { padding: 8px 7px; } }
/* la cornice del video ha la proporzione del video (9:16): con quella delle schermate (860x1864) il video veniva tagliato ai lati e i titoli si leggevano a metà */
.telefono.grande { aspect-ratio: 9 / 16; }
.telefono.grande video { object-fit: contain; }