/* ==========================================================================
   F-Tech — Style sheet unico
   Creato: 2026-05-22
   Aggiornato: 2026-05-22 (caratteri più piccoli, font self-hosted, footer compatto)
   Filosofia: HTML/CSS scritti a mano, mobile-first, leggibilità prima di tutto.
   Niente framework. Niente JavaScript necessario per il rendering base.
   Niente chiamate a CDN esterni (font incluso): nessun cookie, nessun tracking.
   ========================================================================== */

/* ---------- Font self-hosted (no Google Fonts, no cookies) ---------- */
/* Inter — Latin */
@font-face {
  font-family: 'Inter';
  font-style: normal;
  font-weight: 400;
  font-display: swap;
  src: url('fonts/inter-400.woff2') format('woff2');
  unicode-range: U+0000-00FF, U+0131, U+0152-0153, U+02BB-02BC, U+02C6, U+02DA, U+02DC, U+0304, U+0308, U+0329, U+2000-206F, U+20AC, U+2122, U+2191, U+2193, U+2212, U+2215, U+FEFF, U+FFFD;
}
@font-face {
  font-family: 'Inter';
  font-style: normal;
  font-weight: 500;
  font-display: swap;
  src: url('fonts/inter-500.woff2') format('woff2');
  unicode-range: U+0000-00FF, U+0131, U+0152-0153, U+02BB-02BC, U+02C6, U+02DA, U+02DC, U+0304, U+0308, U+0329, U+2000-206F, U+20AC, U+2122, U+2191, U+2193, U+2212, U+2215, U+FEFF, U+FFFD;
}
@font-face {
  font-family: 'Inter';
  font-style: normal;
  font-weight: 600;
  font-display: swap;
  src: url('fonts/inter-600.woff2') format('woff2');
  unicode-range: U+0000-00FF, U+0131, U+0152-0153, U+02BB-02BC, U+02C6, U+02DA, U+02DC, U+0304, U+0308, U+0329, U+2000-206F, U+20AC, U+2122, U+2191, U+2193, U+2212, U+2215, U+FEFF, U+FFFD;
}
@font-face {
  font-family: 'Inter';
  font-style: normal;
  font-weight: 700;
  font-display: swap;
  src: url('fonts/inter-700.woff2') format('woff2');
  unicode-range: U+0000-00FF, U+0131, U+0152-0153, U+02BB-02BC, U+02C6, U+02DA, U+02DC, U+0304, U+0308, U+0329, U+2000-206F, U+20AC, U+2122, U+2191, U+2193, U+2212, U+2215, U+FEFF, U+FFFD;
}

/* Inter — Latin Extended (per accenti italiani avanzati e simboli aggiuntivi) */
@font-face {
  font-family: 'Inter';
  font-style: normal;
  font-weight: 400;
  font-display: swap;
  src: url('fonts/inter-ext-400.woff2') format('woff2');
  unicode-range: U+0100-024F, U+0259, U+1E00-1EFF, U+2020, U+20A0-20AB, U+20AD-20CF, U+2113, U+2C60-2C7F, U+A720-A7FF;
}
@font-face {
  font-family: 'Inter';
  font-style: normal;
  font-weight: 500;
  font-display: swap;
  src: url('fonts/inter-ext-500.woff2') format('woff2');
  unicode-range: U+0100-024F, U+0259, U+1E00-1EFF, U+2020, U+20A0-20AB, U+20AD-20CF, U+2113, U+2C60-2C7F, U+A720-A7FF;
}
@font-face {
  font-family: 'Inter';
  font-style: normal;
  font-weight: 600;
  font-display: swap;
  src: url('fonts/inter-ext-600.woff2') format('woff2');
  unicode-range: U+0100-024F, U+0259, U+1E00-1EFF, U+2020, U+20A0-20AB, U+20AD-20CF, U+2113, U+2C60-2C7F, U+A720-A7FF;
}
@font-face {
  font-family: 'Inter';
  font-style: normal;
  font-weight: 700;
  font-display: swap;
  src: url('fonts/inter-ext-700.woff2') format('woff2');
  unicode-range: U+0100-024F, U+0259, U+1E00-1EFF, U+2020, U+20A0-20AB, U+20AD-20CF, U+2113, U+2C60-2C7F, U+A720-A7FF;
}


/* ---------- Reset minimal ---------- */
*,
*::before,
*::after {
  box-sizing: border-box;
  margin: 0;
  padding: 0;
}

html {
  -webkit-text-size-adjust: 100%;
  scroll-behavior: smooth;
}

body {
  min-height: 100vh;
  line-height: 1.6;
  -webkit-font-smoothing: antialiased;
  -moz-osx-font-smoothing: grayscale;
  text-rendering: optimizeLegibility;
}

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

a {
  color: inherit;
  text-decoration: none;
}

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

ul {
  list-style: none;
}


/* ---------- Variabili design system ---------- */
:root {
  /* Palette */
  --c-arancio: #F39200;
  --c-arancio-hover: #D67D00;
  --c-arancio-soft: #FEF3E0;       /* sfondo molto chiaro per highlight */
  --c-testo: #1A1A1A;
  --c-testo-soft: #4A4A4A;
  --c-testo-muto: #6B6B6B;
  --c-sfondo: #FFFFFF;
  --c-sfondo-alt: #F7F7F5;
  --c-bordo: #E0E0E0;
  --c-bordo-soft: #EFEFEF;

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

  /* Scala spaziatura */
  --sp-1: 0.25rem;   /* 4px  */
  --sp-2: 0.5rem;    /* 8px  */
  --sp-3: 0.75rem;   /* 12px */
  --sp-4: 1rem;      /* 16px */
  --sp-5: 1.5rem;    /* 24px */
  --sp-6: 2rem;      /* 32px */
  --sp-7: 3rem;      /* 48px */
  --sp-8: 4rem;      /* 64px */
  --sp-9: 6rem;      /* 96px */

  /* Container */
  --container-max: 1200px;
  --container-pad: 1.5rem;       /* 24px */
  --container-pad-mobile: 1rem;  /* 16px */

  /* Misure tipografiche */
  --measure: 70ch;

  /* Effetti */
  --radius-sm: 4px;
  --radius-md: 8px;
  --radius-lg: 12px;
  --shadow-card: 0 1px 3px rgba(0,0,0,0.06), 0 4px 12px rgba(0,0,0,0.04);
  --shadow-card-hover: 0 4px 8px rgba(0,0,0,0.08), 0 12px 24px rgba(0,0,0,0.06);

  /* Transizioni */
  --transition-fast: 150ms ease;
  --transition-normal: 250ms ease;
}


/* ---------- Tipografia base ---------- */
body {
  font-family: var(--font-stack);
  font-size: 1rem;              /* 16px - più piccolo rispetto a prima (era 18px) */
  line-height: 1.6;
  color: var(--c-testo);
  background: var(--c-sfondo);
}

h1, h2, h3, h4 {
  font-weight: 700;
  line-height: 1.2;
  color: var(--c-testo);
  letter-spacing: -0.01em;
}

h1 {
  font-size: 1.625rem;   /* 26px mobile (era 32px) */
  margin-bottom: var(--sp-5);
}

h2 {
  font-size: 1.375rem;   /* 22px mobile (era 28px) */
  margin-bottom: var(--sp-4);
}

h3 {
  font-size: 1.125rem;   /* 18px mobile (era 20px) */
  margin-bottom: var(--sp-3);
}

p {
  margin-bottom: var(--sp-4);
  max-width: var(--measure);
}

p:last-child {
  margin-bottom: 0;
}

strong {
  font-weight: 600;
}

/* Link inline */
.contenuto a,
a.link {
  color: var(--c-arancio-hover);
  text-decoration: underline;
  text-underline-offset: 2px;
}

.contenuto a:hover,
a.link:hover {
  color: var(--c-arancio);
}


/* ---------- Skip link (accessibilità) ---------- */
.skip-link {
  position: absolute;
  top: -100px;
  left: 0;
  background: var(--c-testo);
  color: #fff;
  padding: var(--sp-3) var(--sp-5);
  z-index: 1000;
  text-decoration: none;
}

.skip-link:focus {
  top: 0;
}


/* ---------- Focus visibile (accessibilità) ---------- */
:focus-visible {
  outline: 3px solid var(--c-arancio);
  outline-offset: 3px;
  border-radius: var(--radius-sm);
}


/* ---------- Container ---------- */
.container {
  width: 100%;
  max-width: var(--container-max);
  margin: 0 auto;
  padding-left: var(--container-pad-mobile);
  padding-right: var(--container-pad-mobile);
}


/* ---------- Header / Navbar ---------- */
.site-header {
  background: var(--c-sfondo);
  border-bottom: 1px solid var(--c-bordo);
  position: sticky;
  top: 0;
  z-index: 100;
}

.site-header__inner {
  display: flex;
  align-items: center;
  justify-content: space-between;
  padding-top: var(--sp-4);
  padding-bottom: var(--sp-4);
  gap: var(--sp-4);
}

.site-header__logo {
  flex-shrink: 0;
}

.site-header__logo img {
  height: 56px;
  width: auto;
}

.site-nav {
  display: flex;
  gap: var(--sp-1);
  align-items: center;
  flex-wrap: wrap;
}

.site-nav__link {
  padding: var(--sp-2) var(--sp-3);
  font-size: 0.9375rem;       /* 15px */
  font-weight: 500;
  color: var(--c-testo);
  border-radius: var(--radius-sm);
  transition: color var(--transition-fast), background var(--transition-fast);
  min-height: 44px;
  display: inline-flex;
  align-items: center;
}

.site-nav__link:hover {
  color: var(--c-arancio-hover);
  background: var(--c-sfondo-alt);
}

.site-nav__link[aria-current="page"] {
  color: var(--c-arancio-hover);
  font-weight: 600;
}


/* ---------- Hero ---------- */
.hero {
  padding-top: var(--sp-6);
  padding-bottom: var(--sp-6);
}

.hero__eyebrow {
  display: inline-block;
  font-size: 0.75rem;          /* 12px */
  font-weight: 600;
  text-transform: uppercase;
  letter-spacing: 0.08em;
  color: var(--c-arancio-hover);
  margin-bottom: var(--sp-3);
}

.hero__title {
  max-width: 24ch;
  margin-bottom: var(--sp-4);
}

.hero__subtitle {
  font-size: 1rem;             /* 16px - era 20px */
  color: var(--c-testo-soft);
  max-width: 60ch;
  margin-bottom: var(--sp-5);
  line-height: 1.55;
}

.hero__cta {
  display: inline-flex;
}


/* ---------- Bottoni / CTA ---------- */
.btn {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  gap: var(--sp-2);
  padding: var(--sp-3) var(--sp-5);
  min-height: 44px;
  font-size: 0.9375rem;        /* 15px */
  font-weight: 600;
  border-radius: var(--radius-md);
  transition: background var(--transition-fast), color var(--transition-fast), transform var(--transition-fast);
  text-decoration: none;
}

.btn--primary {
  background: var(--c-arancio);
  color: #fff;
}

.btn--primary:hover {
  background: var(--c-arancio-hover);
}

.btn--primary:active {
  transform: translateY(1px);
}

.btn--secondary {
  background: var(--c-sfondo);
  color: var(--c-testo);
  border: 1.5px solid var(--c-bordo);
}

.btn--secondary:hover {
  border-color: var(--c-testo);
}


/* ---------- Sezioni ---------- */
.section {
  padding-top: var(--sp-6);
  padding-bottom: var(--sp-6);
}

.section--alt {
  background: var(--c-sfondo-alt);
}

.section__header {
  margin-bottom: var(--sp-5);
  text-align: left;
}

.section__title {
  margin-bottom: var(--sp-2);
}

.section__intro {
  color: var(--c-testo-soft);
  max-width: 60ch;
  font-size: 0.9375rem;        /* 15px */
}


/* ---------- Griglia prodotti ---------- */
.product-grid {
  display: grid;
  gap: var(--sp-4);
  grid-template-columns: 1fr;
}

.product-card {
  display: flex;
  flex-direction: column;
  background: var(--c-sfondo);
  border: 1px solid var(--c-bordo);
  border-radius: var(--radius-md);
  padding: var(--sp-5);
  text-decoration: none;
  color: inherit;
  transition: border-color var(--transition-normal), box-shadow var(--transition-normal), transform var(--transition-normal);
  height: 100%;
}

.product-card:hover {
  border-color: var(--c-arancio);
  box-shadow: var(--shadow-card-hover);
  transform: translateY(-2px);
}

.product-card__name {
  font-size: 1.125rem;         /* 18px - era 22px */
  font-weight: 700;
  margin-bottom: var(--sp-2);
  color: var(--c-testo);
}

.product-card__desc {
  color: var(--c-testo-soft);
  font-size: 0.9375rem;        /* 15px */
  margin-bottom: var(--sp-4);
  flex-grow: 1;
  line-height: 1.55;
}

.product-card__cta {
  font-weight: 600;
  color: var(--c-arancio-hover);
  font-size: 0.9375rem;        /* 15px */
  display: inline-flex;
  align-items: center;
  gap: var(--sp-2);
}

.product-card__cta::after {
  content: "→";
  transition: transform var(--transition-fast);
}

.product-card:hover .product-card__cta::after {
  transform: translateX(4px);
}


/* ---------- Sezione "Sviluppo personalizzato" ---------- */
.callout {
  background: var(--c-sfondo);
  border: 1px solid var(--c-bordo);
  border-radius: var(--radius-md);
  padding: var(--sp-5);
}

.callout__title {
  margin-bottom: var(--sp-3);
}

.callout__text {
  color: var(--c-testo-soft);
  max-width: var(--measure);
  margin-bottom: var(--sp-4);
  font-size: 0.9375rem;        /* 15px */
}


/* ---------- Pagina prodotto ---------- */
.product-hero {
  padding-top: var(--sp-5);
  padding-bottom: var(--sp-5);
  border-bottom: 1px solid var(--c-bordo-soft);
}

.product-hero__eyebrow {
  display: inline-block;
  font-size: 0.75rem;          /* 12px */
  font-weight: 600;
  text-transform: uppercase;
  letter-spacing: 0.08em;
  color: var(--c-arancio-hover);
  margin-bottom: var(--sp-2);
}

.product-hero__name {
  margin-bottom: var(--sp-3);
}

.product-hero__lead {
  font-size: 1rem;             /* 16px - era 20px */
  color: var(--c-testo-soft);
  max-width: 60ch;
  line-height: 1.55;
}

/* Blocco testo + lista in scheda prodotto */
.prose {
  max-width: var(--measure);
}

.prose h2 {
  margin-top: var(--sp-6);
}

.prose h2:first-child {
  margin-top: 0;
}

.prose p {
  font-size: 0.9375rem;        /* 15px */
  color: var(--c-testo);
  line-height: 1.6;
}

.prose ul.feature-list {
  margin-bottom: var(--sp-5);
}

.prose ul.feature-list li {
  position: relative;
  padding-left: var(--sp-5);
  margin-bottom: var(--sp-2);
  color: var(--c-testo);
  font-size: 0.9375rem;        /* 15px */
  line-height: 1.55;
}

.prose ul.feature-list li::before {
  content: "";
  position: absolute;
  left: 0;
  top: 0.5em;
  width: 10px;
  height: 10px;
  background: var(--c-arancio);
  border-radius: 2px;
}


/* ---------- Box approfondimenti scientifici (RCH) ---------- */
.approfondimenti {
  background: #FFF9F0;
  border: 1px solid #F5D49E;
  border-left: 4px solid var(--c-arancio);
  border-radius: var(--radius-md);
  padding: var(--sp-5);
  margin-top: var(--sp-6);
  margin-bottom: var(--sp-6);
}

.approfondimenti__title {
  font-size: 1.0625rem;
  font-weight: 700;
  margin-bottom: var(--sp-2);
  color: var(--c-testo);
  text-transform: uppercase;
  letter-spacing: 0.04em;
  font-size: 0.8125rem;
}

.approfondimenti__intro {
  color: var(--c-testo-soft);
  font-size: 0.9375rem;
  margin-bottom: var(--sp-4);
}

.approfondimenti__list {
  display: flex;
  flex-direction: column;
  gap: var(--sp-3);
}

.approfondimenti__link {
  display: flex;
  align-items: flex-start;
  gap: var(--sp-3);
  padding: var(--sp-3) var(--sp-4);
  background: var(--c-sfondo);
  border: 1px solid var(--c-bordo);
  border-radius: var(--radius-sm);
  text-decoration: none;
  color: var(--c-testo);
  transition: border-color var(--transition-fast), background var(--transition-fast);
}

.approfondimenti__link:hover {
  border-color: var(--c-arancio);
  background: #FFFEFA;
}

.approfondimenti__link-icon {
  flex-shrink: 0;
  width: 28px;
  height: 28px;
  display: inline-flex;
  align-items: center;
  justify-content: center;
  background: var(--c-arancio-soft);
  border-radius: var(--radius-sm);
  color: var(--c-arancio-hover);
  font-weight: 700;
  font-size: 0.875rem;
}

.approfondimenti__link-body {
  flex-grow: 1;
  min-width: 0;
}

.approfondimenti__link-title {
  font-weight: 600;
  font-size: 0.9375rem;
  color: var(--c-testo);
  margin-bottom: 2px;
  line-height: 1.3;
}

.approfondimenti__link-source {
  font-size: 0.8125rem;
  color: var(--c-testo-muto);
  word-break: break-all;
}

.approfondimenti__link-arrow {
  flex-shrink: 0;
  align-self: center;
  color: var(--c-arancio-hover);
  font-size: 1.125rem;
  transition: transform var(--transition-fast);
}

.approfondimenti__link:hover .approfondimenti__link-arrow {
  transform: translateX(3px);
}


/* ---------- Badge "scientifico" sulla card RCH ---------- */
.product-card__badge {
  display: inline-block;
  font-size: 0.6875rem;
  font-weight: 700;
  text-transform: uppercase;
  letter-spacing: 0.06em;
  color: var(--c-arancio-hover);
  background: var(--c-arancio-soft);
  padding: 2px 8px;
  border-radius: 3px;
  margin-bottom: var(--sp-2);
  align-self: flex-start;
}


/* ---------- CTA finale scheda prodotto ---------- */
.cta-final {
  background: var(--c-sfondo-alt);
  border-radius: var(--radius-md);
  padding: var(--sp-5);
  text-align: left;
  margin-top: var(--sp-7);
}

.cta-final__title {
  margin-bottom: var(--sp-2);
}

.cta-final__text {
  color: var(--c-testo-soft);
  margin-bottom: var(--sp-4);
  max-width: var(--measure);
  font-size: 0.9375rem;        /* 15px */
}


/* ---------- Footer (compatto, conformità legale) ---------- */
.site-footer {
  background: var(--c-testo);
  color: #B5B5B5;
  padding-top: var(--sp-5);
  padding-bottom: var(--sp-4);
  margin-top: var(--sp-8);
  font-size: 0.8125rem;        /* 13px - footer più piccolo */
  line-height: 1.55;
}

.site-footer a {
  color: #D0D0D0;
  text-decoration: none;
  transition: color var(--transition-fast);
}

.site-footer a:hover {
  color: var(--c-arancio);
  text-decoration: underline;
}

.site-footer__brand {
  color: #FFFFFF;
  font-weight: 600;
  font-size: 0.875rem;         /* 14px */
  margin-bottom: var(--sp-2);
  letter-spacing: 0.02em;
}

.site-footer__lines {
  margin-bottom: var(--sp-3);
}

.site-footer__lines p {
  margin-bottom: 2px;
  max-width: none;
  color: #B5B5B5;
  font-size: 0.8125rem;        /* 13px */
}

.site-footer__lines p.site-footer__tagline {
  color: #888;
  font-style: italic;
  margin-top: var(--sp-2);
}

.site-footer__notice {
  color: #888;
  font-size: 0.75rem;          /* 12px */
  margin-top: var(--sp-3);
  padding-top: var(--sp-3);
  border-top: 1px solid #2A2A2A;
}

.site-footer__bottom {
  margin-top: var(--sp-3);
  padding-top: var(--sp-3);
  border-top: 1px solid #2A2A2A;
  color: #666;
  font-size: 0.75rem;          /* 12px */
  display: flex;
  flex-wrap: wrap;
  gap: var(--sp-3);
  justify-content: space-between;
  align-items: center;
}


/* ===========================================================================
   BREAKPOINT TABLET (≥640px)
   =========================================================================== */
@media (min-width: 640px) {
  .container {
    padding-left: var(--container-pad);
    padding-right: var(--container-pad);
  }

  h1 {
    font-size: 2.25rem;        /* 36px desktop (era 48px) */
  }

  h2 {
    font-size: 1.625rem;       /* 26px desktop (era 36px) */
  }

  h3 {
    font-size: 1.25rem;        /* 20px desktop (era 24px) */
  }

  .product-grid {
    grid-template-columns: repeat(2, 1fr);
  }

  /* Su tablet, 5 card: la prima occupa tutta la larghezza, le altre 2 per riga */
  .product-grid--five .product-card:first-child {
    grid-column: 1 / -1;
  }

  .hero__subtitle {
    font-size: 1.0625rem;      /* 17px desktop */
  }

  .product-hero__lead {
    font-size: 1.0625rem;      /* 17px desktop */
  }
}


/* ===========================================================================
   BREAKPOINT DESKTOP (≥1024px)
   =========================================================================== */
@media (min-width: 1024px) {
  .site-header__logo img {
    height: 72px;
  }

  .hero {
    padding-top: var(--sp-7);
    padding-bottom: var(--sp-7);
  }

  .hero__title {
    font-size: 2.5rem;         /* 40px desktop large (era 56px) */
  }

  .product-grid {
    grid-template-columns: repeat(4, 1fr);
  }

  /* Su desktop, 5 card: la prima occupa 2 colonne (più ampia, è il prodotto di punta), le altre 4 una colonna ciascuna */
  .product-grid--five {
    grid-template-columns: repeat(4, 1fr);
    grid-template-rows: auto auto;
  }

  .product-grid--five .product-card:first-child {
    grid-column: 1 / -1;
  }

  .product-card {
    padding: var(--sp-4);
  }

  .product-card__name {
    font-size: 1.0625rem;      /* 17px */
  }

  .section {
    padding-top: var(--sp-7);
    padding-bottom: var(--sp-7);
  }

  .product-hero {
    padding-top: var(--sp-6);
    padding-bottom: var(--sp-6);
  }
}