/* =====================================================================
   GovernaTech SRLS — Foglio di stile principale
   Organizzazione:
     1. Variabili (palette, tipografia, spaziature)
     2. Reset & base
     3. Layout (container, sezioni)
     4. Componenti (bottoni, card, catena del valore, posizionamento, tabelle, faq, form...)
     5. Header / Hero / Footer
     6. Utilità & accessibilità
     7. Animazioni reveal
     8. Responsive
     9. Dark mode
   ===================================================================== */

/* ============ 1. VARIABILI ============ */
:root {
  /* Palette (tema chiaro) */
  --c-navy:        #0B1F3A;   /* blu scuro istituzionale */
  --c-navy-2:      #13315f;
  --c-blue:        #2563EB;   /* blu elettrico / azione */
  --c-blue-dark:   #1d4ed8;
  --c-sky:         #38BDF8;   /* azzurro accento */
  --c-gray-bg:     #F5F7FA;   /* grigio chiaro di sezione */
  --c-bg:          #ffffff;   /* sfondo pagina (in dark mode diventa scuro) */

  /* Testo */
  --c-text:        #0f1c33;
  --c-text-soft:   #4b5a73;
  --c-muted:       #5d6d88;

  /* Bordi / superfici */
  --c-border:      #e3e9f2;
  --c-surface:     #ffffff;
  --c-surface-2:   #f5f7fa;

  /* Accento per testi e icone: in dark mode viene schiarito per
     garantire il contrasto WCAG sugli sfondi scuri */
  --c-blue-text:       var(--c-blue);
  --c-blue-text-hover: var(--c-blue-dark);

  /* Brand gradient */
  --grad-brand: linear-gradient(135deg, var(--c-blue), var(--c-sky));

  /* Tipografia */
  --font-head: 'Inter', system-ui, -apple-system, Segoe UI, Roboto, sans-serif;
  --font-body: 'Manrope', system-ui, -apple-system, Segoe UI, Roboto, sans-serif;

  /* Spaziature */
  --space-section: clamp(4rem, 8vw, 7rem);
  --radius:        14px;
  --radius-lg:     22px;
  --shadow-sm:     0 1px 2px rgba(11,31,58,.06), 0 4px 16px rgba(11,31,58,.06);
  --shadow-md:     0 8px 30px rgba(11,31,58,.10);
  --shadow-lg:     0 20px 50px rgba(11,31,58,.16);

  --container:     1200px;
  --header-h:      72px;

  --transition:    .25s ease;
}

/* ============ 2. RESET & BASE ============ */
*, *::before, *::after { box-sizing: border-box; }
* { margin: 0; }

html { scroll-behavior: smooth; scroll-padding-top: calc(var(--header-h) + 16px); -webkit-text-size-adjust: 100%; }

body {
  font-family: var(--font-body);
  color: var(--c-text);
  background: var(--c-bg);
  line-height: 1.65;
  font-size: 1rem;
  -webkit-font-smoothing: antialiased;
  text-rendering: optimizeLegibility;
  overflow-x: hidden;
}

img, svg { display: block; max-width: 100%; }
img { height: auto; }

a { color: var(--c-blue-text); text-decoration: none; transition: color var(--transition); }
a:hover { color: var(--c-blue-text-hover); }

h1, h2, h3, h4 { font-family: var(--font-head); line-height: 1.15; color: var(--c-navy); font-weight: 700; }
ul, ol { list-style: none; padding: 0; }

button { font: inherit; cursor: pointer; border: none; background: none; color: inherit; }

:focus-visible { outline: 3px solid var(--c-sky); outline-offset: 2px; border-radius: 4px; }

/* ============ 3. LAYOUT ============ */
.container { width: min(100% - 2.5rem, var(--container)); margin-inline: auto; }
.container--narrow { max-width: 820px; }

.section { padding-block: var(--space-section); }
.section--alt { background: var(--c-gray-bg); }

.section__head { max-width: 720px; margin-bottom: 3rem; }
.section__title { font-size: clamp(1.7rem, 3.4vw, 2.5rem); letter-spacing: -.02em; }
.section__lead { margin-top: 1rem; color: var(--c-text-soft); font-size: 1.075rem; }

.section__intro { max-width: 460px; }
.section__intro .section__title { font-size: clamp(1.7rem, 3.2vw, 2.4rem); }

.section--split {
  display: grid;
  grid-template-columns: 0.9fr 1.1fr;
  gap: clamp(2rem, 5vw, 5rem);
  align-items: start;
}

.eyebrow {
  display: inline-block;
  font-family: var(--font-head);
  font-size: .8rem;
  font-weight: 600;
  letter-spacing: .12em;
  text-transform: uppercase;
  color: var(--c-blue-text);
  margin-bottom: .75rem;
}

/* ============ 4. COMPONENTI ============ */

/* --- Bottoni --- */
.btn {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  gap: .5rem;
  font-family: var(--font-head);
  font-weight: 600;
  font-size: .975rem;
  padding: .85rem 1.6rem;
  border-radius: 999px;
  transition: transform var(--transition), box-shadow var(--transition), background var(--transition), color var(--transition);
  border: 2px solid transparent;
  text-align: center;
}
.btn--primary { background: var(--c-blue); color: #fff; box-shadow: var(--shadow-sm); }
.btn--primary:hover { background: var(--c-blue-dark); color: #fff; transform: translateY(-2px); box-shadow: var(--shadow-md); }
/* Nota: #fff letterale (non una variabile tema) perché questi bottoni
   vivono su sfondi sempre scuri/brand, in entrambi i temi */
.btn--ghost { background: transparent; color: #fff; border-color: rgba(255,255,255,.55); }
.btn--ghost:hover { background: rgba(255,255,255,.12); color: #fff; transform: translateY(-2px); }
.btn--light { background: #fff; color: var(--c-navy); }
.btn--light:hover { transform: translateY(-2px); box-shadow: var(--shadow-md); color: var(--c-navy); }

/* --- Card servizi --- */
.cards { display: grid; grid-template-columns: repeat(auto-fit, minmax(260px, 1fr)); gap: 1.5rem; }
.card {
  background: var(--c-surface);
  border: 1px solid var(--c-border);
  border-radius: var(--radius-lg);
  padding: 2rem 1.75rem;
  transition: transform var(--transition), box-shadow var(--transition), border-color var(--transition);
}
.card:hover { transform: translateY(-6px); box-shadow: var(--shadow-md); border-color: transparent; }
.card__icon {
  width: 56px; height: 56px;
  display: grid; place-items: center;
  border-radius: 14px;
  background: linear-gradient(135deg, rgba(37,99,235,.12), rgba(56,189,248,.12));
  color: var(--c-blue-text);
  margin-bottom: 1.25rem;
}
.card__title { font-size: 1.2rem; margin-bottom: 1rem; }
.card__list { display: grid; gap: .4rem; }
.card__list li { position: relative; padding-left: 1.4rem; color: var(--c-text-soft); font-size: .95rem; }
.card__list li::before {
  content: ""; position: absolute; left: 0; top: .6em;
  width: 7px; height: 7px; border-radius: 50%;
  background: var(--grad-brand);
}

/* --- Card pilastri (catena del valore) --- */
.card__eyebrow {
  display: inline-block;
  font-family: var(--font-head);
  font-size: .76rem;
  font-weight: 700;
  letter-spacing: .12em;
  text-transform: uppercase;
  color: var(--c-blue-text);
  margin-bottom: .35rem;
}
.card__text { color: var(--c-text-soft); font-size: .95rem; margin-bottom: 1.25rem; }

/* Griglia 3+2 centrata per i cinque pilastri */
.cards--pillars { display: grid; grid-template-columns: repeat(6, 1fr); gap: 1.5rem; }
.cards--pillars .card { grid-column: span 2; }
.cards--pillars .card:nth-child(4) { grid-column: 2 / span 2; }

/* --- Catena visiva (5 pilastri in sequenza) --- */
.chain {
  display: flex; flex-wrap: wrap; align-items: center; justify-content: center;
  gap: .6rem .5rem;
  margin-bottom: 3rem;
}
.chain__step {
  display: inline-flex; align-items: center;
  font-family: var(--font-head); font-weight: 600; font-size: .9rem;
  color: var(--c-navy);
  background: var(--c-surface);
  border: 1px solid var(--c-border);
  border-radius: 999px;
  padding: .55rem 1.2rem;
  box-shadow: var(--shadow-sm);
}
.chain__arrow { color: var(--c-blue-text); font-size: 1.15rem; line-height: 1; flex: none; }

/* --- Posizionamento (Governare il cambiamento) --- */
.positioning { background: var(--c-navy); color: #fff; padding-block: var(--space-section); }
.positioning .eyebrow { color: var(--c-sky); }
.positioning__title { color: #fff; font-size: clamp(1.7rem, 3.4vw, 2.5rem); letter-spacing: -.02em; max-width: 760px; }
.positioning__negations { display: flex; flex-wrap: wrap; gap: .75rem; margin: 1.75rem 0 2rem; }
.positioning__negation {
  border: 1px solid rgba(255,255,255,.25);
  border-radius: 999px;
  padding: .5rem 1.15rem;
  color: #c7d3e8;
  font-size: .95rem;
}
.positioning__text { color: #d7e2f4; max-width: 760px; }
.positioning__text + .positioning__text { margin-top: 1rem; }
.positioning__text strong { color: #fff; }

/* --- Settori --- */
.sectors { display: grid; grid-template-columns: repeat(auto-fit, minmax(160px, 1fr)); gap: 1.25rem; }
.sector {
  background: var(--c-surface);
  border: 1px solid var(--c-border);
  border-radius: var(--radius);
  padding: 1.75rem 1.25rem;
  display: flex; flex-direction: column; align-items: center; gap: .85rem;
  text-align: center;
  font-family: var(--font-head); font-weight: 600; color: var(--c-navy);
  transition: transform var(--transition), box-shadow var(--transition);
}
.sector:hover { transform: translateY(-4px); box-shadow: var(--shadow-md); }
.sector__icon { color: var(--c-blue-text); }

/* --- Vantaggi --- */
.features { display: grid; grid-template-columns: repeat(auto-fit, minmax(280px, 1fr)); gap: 1.5rem; }
.feature {
  background: var(--c-surface);
  border: 1px solid var(--c-border);
  border-left: 4px solid var(--c-blue);
  border-radius: var(--radius);
  padding: 1.75rem;
  transition: transform var(--transition), box-shadow var(--transition);
}
.feature:hover { transform: translateY(-4px); box-shadow: var(--shadow-md); }
.feature__title { font-size: 1.1rem; margin-bottom: .4rem; }
.feature__text { color: var(--c-text-soft); }
.feature__num {
  display: grid; place-items: center;
  width: 34px; height: 34px; border-radius: 50%;
  background: linear-gradient(135deg, var(--c-blue-dark), var(--c-blue));
  color: #fff; font-family: var(--font-head); font-weight: 700; font-size: .95rem;
  margin-bottom: 1rem;
}

/* --- Sottosezioni (Business Design & IA) --- */
.subsection { margin-top: 3.5rem; }
.subsection__title { font-size: 1.35rem; margin-bottom: .6rem; }
.subsection__lead { color: var(--c-text-soft); margin-bottom: 1.75rem; max-width: 720px; }

/* --- Tabella modelli di business --- */
.table-scroll {
  overflow-x: auto;
  background: var(--c-surface);
  border: 1px solid var(--c-border);
  border-radius: var(--radius-lg);
  box-shadow: var(--shadow-sm);
  -webkit-overflow-scrolling: touch;
}
.models-table { width: 100%; min-width: 720px; border-collapse: collapse; font-size: .95rem; }
.models-table th, .models-table td { text-align: left; padding: 1rem 1.25rem; vertical-align: top; line-height: 1.55; }
.models-table thead th {
  font-family: var(--font-head); font-size: .8rem; font-weight: 700;
  letter-spacing: .08em; text-transform: uppercase;
  color: var(--c-navy);
  background: var(--c-surface-2);
  border-bottom: 1px solid var(--c-border);
}
.models-table tbody th[scope="row"] { font-family: var(--font-head); font-weight: 600; color: var(--c-navy); }
.models-table tbody tr + tr th, .models-table tbody tr + tr td { border-top: 1px solid var(--c-border); }

/* --- FAQ --- */
.faq { display: grid; gap: .85rem; }
.faq__item {
  background: var(--c-surface);
  border: 1px solid var(--c-border);
  border-radius: var(--radius);
  overflow: hidden;
}
.faq__question {
  width: 100%;
  display: flex; align-items: center; justify-content: space-between; gap: 1rem;
  padding: 1.15rem 1.4rem;
  font-family: var(--font-head); font-weight: 600; color: var(--c-navy);
  font-size: 1.02rem; text-align: left;
}
.faq__chevron { flex: none; color: var(--c-blue-text); transition: transform var(--transition); }
.faq__question[aria-expanded="true"] .faq__chevron { transform: rotate(180deg); }
.faq__answer { max-height: 0; overflow: hidden; transition: max-height .35s ease; }
.faq__answer p { padding: 0 1.4rem 1.3rem; color: var(--c-text-soft); }

/* --- Contatti --- */
.contact-cta { margin-top: 1.75rem; }

.contact-info { font-style: normal; color: var(--c-text-soft); }
.contact-info p { margin-bottom: .6rem; }
.contact-info strong { color: var(--c-navy); }
.contact-info__pec { font-weight: 600; }
.contact-info__vat { font-size: .85rem; color: var(--c-muted); margin-top: 1rem; }

/* ============ 5. HEADER / HERO / FOOTER ============ */

/* --- Header --- */
.site-header {
  position: sticky; top: 0; z-index: 100;
  border-bottom: 1px solid transparent;
  transition: border-color var(--transition), box-shadow var(--transition), background var(--transition);
}
/* Vetro smerigliato su pseudo-elemento: un backdrop-filter applicato
   direttamente all'header ne farebbe da containing block per il menu
   mobile (position: fixed), che invece deve ancorarsi al viewport */
.site-header::before {
  content: ""; position: absolute; inset: 0; z-index: -1;
  background: rgba(255,255,255,.85);
  -webkit-backdrop-filter: saturate(180%) blur(12px);
  backdrop-filter: saturate(180%) blur(12px);
}
.site-header.is-scrolled { border-bottom-color: var(--c-border); box-shadow: var(--shadow-sm); }
.header__inner {
  height: var(--header-h);
  display: flex; align-items: center; justify-content: space-between; gap: 1rem;
}
.brand { display: inline-flex; align-items: center; }
.brand__logo { height: 46px; width: auto; border-radius: 6px; }
.brand--footer .brand__logo { height: 44px; filter: brightness(0) invert(1); }
.brand:hover .brand__logo { opacity: .85; }
.brand__logo { transition: opacity var(--transition); }

.nav__list { display: flex; align-items: center; gap: .35rem; }
.nav__link {
  font-family: var(--font-head); font-weight: 500; font-size: .95rem;
  color: var(--c-text); padding: .5rem .8rem; border-radius: 8px;
}
.nav__link:hover { color: var(--c-blue-text); background: rgba(37,99,235,.07); }
.nav__link--cta {
  background: var(--c-blue); color: #fff !important; padding: .6rem 1.2rem;
}
.nav__link--cta:hover { background: var(--c-blue-dark); }

.header__actions { display: flex; align-items: center; gap: .5rem; }
.theme-toggle {
  width: 44px; height: 44px; border-radius: 50%;
  display: grid; place-items: center; color: var(--c-navy);
  transition: background var(--transition), color var(--transition);
}
.theme-toggle:hover { background: rgba(37,99,235,.1); color: var(--c-blue-text); }
.theme-toggle .icon { transition: opacity var(--transition), transform var(--transition); }
.theme-toggle .icon-moon { display: none; }
[data-theme="dark"] .theme-toggle .icon-sun { display: none; }
[data-theme="dark"] .theme-toggle .icon-moon { display: block; }

.hamburger { display: none; width: 44px; height: 44px; flex-direction: column; justify-content: center; gap: 5px; align-items: center; }
.hamburger__bar { width: 24px; height: 2.5px; background: var(--c-navy); border-radius: 2px; transition: transform var(--transition), opacity var(--transition); }
.hamburger.is-active .hamburger__bar:nth-child(1) { transform: translateY(7.5px) rotate(45deg); }
.hamburger.is-active .hamburger__bar:nth-child(2) { opacity: 0; }
.hamburger.is-active .hamburger__bar:nth-child(3) { transform: translateY(-7.5px) rotate(-45deg); }

/* --- Hero --- */
.hero { position: relative; color: #fff; overflow: hidden; padding-block: clamp(4.5rem, 11vw, 9rem); }
.hero__bg { position: absolute; inset: 0; z-index: -1; }
.hero__bg::after {
  content: ""; position: absolute; inset: 0;
  background: radial-gradient(circle at 80% 20%, rgba(56,189,248,.25), transparent 45%);
}
.hero__pattern { width: 100%; height: 100%; object-fit: cover; }
.hero__content { max-width: 820px; }
.hero__eyebrow {
  font-family: var(--font-head); font-weight: 600; letter-spacing: .1em; text-transform: uppercase;
  font-size: .85rem; color: #7dd3fc; margin-bottom: 1.1rem; /* azzurro chiaro: #38BDF8 sull'hero restava ~4.4:1 */
}
.hero__title {
  color: #fff; font-size: clamp(2rem, 5.2vw, 3.6rem); line-height: 1.08; letter-spacing: -.03em;
  margin-bottom: 1.25rem; font-weight: 800;
}
.hero__subtitle { font-size: clamp(1.05rem, 1.8vw, 1.25rem); color: #d7e2f4; max-width: 640px; margin-bottom: 2rem; }
.hero__actions { display: flex; flex-wrap: wrap; gap: 1rem; }
.text-grad {
  /* gradiente leggermente più chiaro di --grad-brand: serve contrasto
     sul navy dell'hero (il blu pieno restava sotto 3:1) */
  background: linear-gradient(135deg, #60a5fa, var(--c-sky));
  -webkit-background-clip: text; background-clip: text;
  -webkit-text-fill-color: transparent; color: transparent;
}

/* --- CTA --- */
/* gradiente scuro (blue-700 → blue-600): il gradiente brand chiaro
   lasciava il testo bianco sotto 4.5:1 nella metà destra della banda */
.cta { background: linear-gradient(135deg, var(--c-blue-dark), var(--c-blue)); color: #fff; padding-block: clamp(3rem, 7vw, 5rem); text-align: center; }
.cta__inner { max-width: 760px; margin-inline: auto; }
.cta__title { color: #fff; font-size: clamp(1.6rem, 3.4vw, 2.4rem); margin-bottom: 1rem; }
.cta__text { color: rgba(255,255,255,.92); font-size: 1.1rem; margin-bottom: 2rem; }

/* --- Footer --- */
.site-footer { background: var(--c-navy); color: #c7d3e8; padding-top: 4rem; }
.site-footer__inner {
  display: grid; grid-template-columns: 1.4fr 1fr 1fr; gap: 2.5rem; padding-bottom: 2.5rem;
}
.site-footer__tagline { margin-top: 1rem; color: #9fb0cc; max-width: 320px; }
.site-footer__heading { color: #fff; font-size: 1rem; margin-bottom: 1rem; letter-spacing: .02em; }
.site-footer__nav ul, .site-footer__contact address { display: grid; gap: .5rem; font-style: normal; }
.site-footer a { color: #c7d3e8; }
.site-footer a:hover { color: #fff; }
.site-footer__bottom { border-top: 1px solid rgba(255,255,255,.12); padding-block: 1.25rem; }
.site-footer__bottom p { color: #9fb0cc; font-size: .875rem; text-align: center; }

/* --- Back to top --- */
.back-to-top {
  position: fixed; right: 1.25rem; bottom: 1.25rem; z-index: 90;
  width: 48px; height: 48px; border-radius: 50%;
  background: var(--c-blue); color: #fff;
  display: grid; place-items: center;
  box-shadow: var(--shadow-md);
  opacity: 0; visibility: hidden; transform: translateY(12px);
  transition: opacity var(--transition), transform var(--transition), background var(--transition);
}
.back-to-top.is-visible { opacity: 1; visibility: visible; transform: translateY(0); }
.back-to-top:hover { background: var(--c-blue-dark); transform: translateY(-3px); }

/* ============ 6. UTILITÀ & ACCESSIBILITÀ ============ */
.visually-hidden {
  position: absolute !important; width: 1px; height: 1px; padding: 0; margin: -1px;
  overflow: hidden; clip: rect(0,0,0,0); white-space: nowrap; border: 0;
}
.skip-link {
  position: absolute; left: 1rem; top: -100px; z-index: 200;
  background: var(--c-blue); color: #fff; padding: .75rem 1.25rem; border-radius: 8px;
  font-family: var(--font-head); font-weight: 600; transition: top var(--transition);
}
.skip-link:focus { top: 1rem; color: #fff; }

@media (prefers-reduced-motion: reduce) {
  *, *::before, *::after { animation-duration: .001ms !important; animation-iteration-count: 1 !important; transition-duration: .001ms !important; scroll-behavior: auto !important; }
  .reveal { opacity: 1 !important; transform: none !important; }
}

/* ============ 7. ANIMAZIONI REVEAL ============ */
.reveal { opacity: 0; transform: translateY(28px); transition: opacity .6s ease, transform .6s ease; }
.reveal.is-visible { opacity: 1; transform: none; }

/* ============ 8. RESPONSIVE ============ */
@media (max-width: 992px) {
  .section--split { grid-template-columns: 1fr; gap: 2.5rem; }
  .cards--pillars { grid-template-columns: repeat(2, 1fr); }
  .cards--pillars .card,
  .cards--pillars .card:nth-child(4) { grid-column: auto; }
  .site-footer__inner { grid-template-columns: 1fr 1fr; }
  .site-footer__brand { grid-column: 1 / -1; }
}

@media (max-width: 768px) {
  /* Menu hamburger mobile */
  .nav {
    position: fixed; inset: var(--header-h) 0 0 0;
    background: var(--c-surface);
    flex-direction: column;
    padding: 1.5rem;
    transform: translateX(100%);
    transition: transform .3s ease;
    overflow-y: auto;
    box-shadow: var(--shadow-lg);
  }
  .nav.is-open { transform: translateX(0); }
  .nav__list { flex-direction: column; align-items: stretch; gap: .25rem; width: 100%; }
  .nav__list li { width: 100%; }
  .nav__link { display: block; padding: .9rem 1rem; font-size: 1.05rem; border-radius: 10px; }
  .nav__link--cta { text-align: center; margin-top: .5rem; }
  .hamburger { display: flex; }

  body.nav-open { overflow: hidden; }
}

@media (max-width: 560px) {
  .cards--pillars { grid-template-columns: 1fr; }
  .chain__arrow { display: none; }
  .chain__step { width: 100%; justify-content: center; }
  .brand__logo { height: 36px; }
  .site-footer__inner { grid-template-columns: 1fr; }
  .hero__actions .btn { width: 100%; }
  .contact-cta { display: flex; width: 100%; }
}

/* ============ 9. DARK MODE ============ */
[data-theme="dark"] {
  --c-navy: #0a1830;
  --c-text: #e7edf7;
  --c-text-soft: #b3c0d6;
  --c-muted: #8898b3;
  --c-surface: #111f38;
  --c-surface-2: #0d1a30;
  --c-gray-bg: #0c1830;
  --c-border: #1f3050;
  --c-bg: #111f38;
  /* blu schiarito per testi/link/icone: #2563EB su #111f38 è ~3.2:1,
     sotto il minimo WCAG AA (4.5:1) per il testo */
  --c-blue-text: #7cb0ff;
  --c-blue-text-hover: #a5c8ff;
  --shadow-sm: 0 1px 2px rgba(0,0,0,.3), 0 4px 16px rgba(0,0,0,.25);
  --shadow-md: 0 8px 30px rgba(0,0,0,.4);
  --shadow-lg: 0 20px 50px rgba(0,0,0,.5);
}
[data-theme="dark"] h1, [data-theme="dark"] h2, [data-theme="dark"] h3, [data-theme="dark"] h4 { color: #fff; }
[data-theme="dark"] .brand__logo { filter: brightness(0) invert(1); }
[data-theme="dark"] .site-header::before { background: rgba(13,26,48,.85); }
[data-theme="dark"] .nav { background: var(--c-surface); }
[data-theme="dark"] .faq__question { color: #fff; }
[data-theme="dark"] .sector { color: #fff; }
[data-theme="dark"] .hamburger__bar { background: #fff; }
[data-theme="dark"] .theme-toggle { color: #fff; }
[data-theme="dark"] .contact-info strong { color: #fff; }
[data-theme="dark"] .chain__step,
[data-theme="dark"] .models-table thead th,
[data-theme="dark"] .models-table tbody th[scope="row"] { color: #fff; }
[data-theme="dark"] .text-grad { -webkit-text-fill-color: transparent; }