/* =========================================================
   Ecotherm — denox.it
   Base styles + Hero
   ========================================================= */

/* ---------- Design tokens ---------- */
:root {
  /* Palette */
  --c-ink:        #1B2A3A;    /* blu industriale scuro */
  --c-ink-2:      #223548;    /* blu leggermente più chiaro, per elevation su scuro */
  --c-steel:      #E8ECEF;    /* grigio acciaio chiaro */
  --c-steel-2:    #D4DADE;    /* grigio più marcato per bordi/placeholder */
  --c-white:      #FFFFFF;
  --c-text:       #374151;    /* testo su chiaro */
  --c-text-muted: #6B7380;    /* testo secondario su chiaro */
  --c-accent:     #C87533;    /* rame industriale — CTA */
  --c-accent-dk:  #A85E24;    /* accento hover */
  --c-border:     #CED3D8;    /* bordi su chiaro */
  --c-border-dk:  rgba(255,255,255,0.18); /* bordi su scuro */

  /* Tipografia */
  --ff-sans: "Inter", -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, Helvetica, Arial, sans-serif;
  --ff-mono: "JetBrains Mono", ui-monospace, SFMono-Regular, Menlo, Consolas, monospace;

  /* Scala testo */
  --fs-h1: clamp(2.5rem, 5vw, 4rem);
  --fs-h2: clamp(1.75rem, 3vw, 2.5rem);
  --fs-h3: clamp(1.25rem, 1.6vw, 1.5rem);
  --fs-body: 1.0625rem;       /* 17px */
  --fs-small: 0.875rem;
  --fs-eyebrow: 0.8125rem;

  /* Spazi */
  --sp-1: 0.25rem;
  --sp-2: 0.5rem;
  --sp-3: 0.75rem;
  --sp-4: 1rem;
  --sp-5: 1.5rem;
  --sp-6: 2rem;
  --sp-7: 3rem;
  --sp-8: 4rem;
  --sp-9: 6rem;

  /* Layout */
  --container: 1200px;
  --radius: 4px;          /* sobrio, industriale */
  --radius-lg: 8px;
  --header-h: 72px;

  /* Motion */
  --t-fast: 140ms ease;
  --t-med:  220ms ease;
}

/* ---------- Reset moderno (minimale) ---------- */
*, *::before, *::after { box-sizing: border-box; }
* { margin: 0; }
html { -webkit-text-size-adjust: 100%; text-size-adjust: 100%; }
html:focus-within { scroll-behavior: smooth; }
body {
  min-height: 100vh;
  line-height: 1.55;
  -webkit-font-smoothing: antialiased;
  text-rendering: optimizeLegibility;
  font-family: var(--ff-sans);
  font-size: var(--fs-body);
  color: var(--c-text);
  background: var(--c-white);
}
img, picture, svg, video { display: block; max-width: 100%; height: auto; }
input, button, textarea, select { font: inherit; color: inherit; }
button { background: none; border: 0; cursor: pointer; }
a { color: inherit; text-decoration: none; }
ul { list-style: none; padding: 0; }

/* ---------- Accessibilità ---------- */
.skip-link {
  position: absolute;
  left: -9999px;
  top: 0;
  background: var(--c-ink);
  color: var(--c-white);
  padding: var(--sp-3) var(--sp-4);
  z-index: 1000;
}
.skip-link:focus { left: var(--sp-3); top: var(--sp-3); }

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

@media (prefers-reduced-motion: reduce) {
  *, *::before, *::after {
    animation-duration: 0.01ms !important;
    transition-duration: 0.01ms !important;
    scroll-behavior: auto !important;
  }
}

/* ---------- Typography base ---------- */
h1, h2, h3, h4 {
  font-family: var(--ff-sans);
  color: inherit;
  line-height: 1.15;
  letter-spacing: -0.01em;
}
h1 { font-weight: 800; font-size: var(--fs-h1); letter-spacing: -0.02em; }
h2 { font-weight: 700; font-size: var(--fs-h2); }
h3 { font-weight: 700; font-size: var(--fs-h3); }
p  { color: inherit; }

/* ---------- Utility ---------- */
.container {
  width: 100%;
  max-width: var(--container);
  margin-inline: auto;
  padding-inline: var(--sp-5);
}

.mono { font-family: var(--ff-mono); }

/* ---------- Buttons ---------- */
.btn {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  gap: var(--sp-2);
  padding: 0.95rem 1.6rem;
  font-weight: 600;
  font-size: 1rem;
  line-height: 1;
  letter-spacing: 0.01em;
  border-radius: var(--radius);
  border: 1.5px solid transparent;
  transition: background var(--t-med), color var(--t-med),
              border-color var(--t-med), transform var(--t-fast),
              box-shadow var(--t-med);
  white-space: nowrap;
  cursor: pointer;
}
.btn:active { transform: translateY(1px); }

.btn--primary {
  background: var(--c-accent);
  color: var(--c-white);
  border-color: var(--c-accent);
  box-shadow: 0 1px 0 rgba(0,0,0,0.12);
}
.btn--primary:hover,
.btn--primary:focus-visible {
  background: var(--c-accent-dk);
  border-color: var(--c-accent-dk);
}

.btn--ghost {
  background: transparent;
  color: var(--c-white);
  border-color: rgba(255,255,255,0.5);
}
.btn--ghost:hover,
.btn--ghost:focus-visible {
  background: rgba(255,255,255,0.08);
  border-color: var(--c-white);
}

/* =========================================================
   Header
   ========================================================= */
.site-header {
  position: sticky;
  top: 0;
  z-index: 100;
  background: var(--c-ink);
  color: var(--c-white);
  border-bottom: 1px solid var(--c-border-dk);
  backdrop-filter: saturate(1.2);
}
.site-header__inner {
  display: flex;
  align-items: center;
  gap: var(--sp-5);
  min-height: var(--header-h);
}

/* Brand */
.brand {
  display: inline-flex;
  align-items: center;
  gap: 0.65rem;
  color: var(--c-white);
  flex-shrink: 0;
}
.brand__mark {
  display: inline-block;
  width: 3px;
  height: 22px;
  background: var(--c-accent);
  border-radius: 1px;
}
.brand__name {
  font-weight: 900;
  font-size: 1.15rem;
  letter-spacing: 0.14em;
}

/* Nav */
.site-nav {
  margin-left: auto;
}
.site-nav__list {
  display: flex;
  gap: var(--sp-5);
  align-items: center;
}
.site-nav__list a {
  display: inline-block;
  padding: 0.5rem 0;
  font-size: 0.9rem;
  font-weight: 500;
  color: rgba(255,255,255,0.85);
  transition: color var(--t-fast);
  position: relative;
}
.site-nav__list a:hover,
.site-nav__list a:focus-visible {
  color: var(--c-white);
}
.site-nav__list a::after {
  content: "";
  position: absolute;
  left: 0; right: 0; bottom: -2px;
  height: 2px;
  background: var(--c-accent);
  transform: scaleX(0);
  transform-origin: left;
  transition: transform var(--t-med);
}
.site-nav__list a:hover::after,
.site-nav__list a:focus-visible::after { transform: scaleX(1); }

/* Lang switch */
.lang-switch {
  display: inline-flex;
  align-items: center;
  gap: 0.35rem;
  padding: 0.25rem 0.5rem;
  border: 1px solid var(--c-border-dk);
  border-radius: var(--radius);
  font-size: 0.8125rem;
  font-weight: 600;
  letter-spacing: 0.06em;
  flex-shrink: 0;
}
.lang-switch__btn {
  padding: 0.25rem 0.4rem;
  color: rgba(255,255,255,0.55);
  transition: color var(--t-fast);
  border-radius: 2px;
}
.lang-switch__btn.is-active { color: var(--c-white); }
.lang-switch__btn:hover { color: var(--c-white); }
.lang-switch__sep { color: rgba(255,255,255,0.3); }

/* Mobile nav toggle */
.nav-toggle {
  display: none;
  width: 40px;
  height: 40px;
  padding: 8px;
  margin-left: var(--sp-2);
  flex-direction: column;
  justify-content: space-between;
  align-items: stretch;
}
.nav-toggle span {
  display: block;
  height: 2px;
  background: var(--c-white);
  border-radius: 1px;
  transition: transform var(--t-med), opacity var(--t-fast);
}

/* =========================================================
   Mobile nav drawer (fullscreen sotto 960px)
   ========================================================= */
.nav-drawer {
  position: fixed;
  inset: 0;
  z-index: 200;                  /* sopra header sticky (100) */
  background: var(--c-ink);      /* #1B2A3A */
  color: var(--c-white);
  overflow-y: auto;
  overflow-x: hidden;
  -webkit-overflow-scrolling: touch;

  /* stato pre-animazione (hidden o is-open=false) */
  opacity: 0;
  transform: translateY(-10px);
  transition: opacity 240ms ease-out, transform 240ms ease-out;
}
.nav-drawer[hidden] { display: none; }
.nav-drawer.is-open {
  opacity: 1;
  transform: translateY(0);
}

/* Reduced motion: rimuovi slide verticale sul drawer
   (la transition-duration è già azzerata dalla regola globale riga ~94) */
@media (prefers-reduced-motion: reduce) {
  .nav-drawer {
    transition: none;
    transform: none;
  }
}

/* Sopra 960px il drawer è sempre forzato fuori — menu desktop attivo */
@media (min-width: 961px) {
  .nav-drawer { display: none !important; }
}

/* Body lock quando drawer aperto */
body.nav-open { overflow: hidden; }

/* Container interno */
.nav-drawer__inner {
  max-width: 720px;
  margin-inline: auto;
  padding: var(--sp-4) var(--sp-5) var(--sp-7);
  min-height: 100%;
  display: flex;
  flex-direction: column;
}

/* Head: brand (sx) + close (dx) */
.nav-drawer__head {
  display: flex;
  align-items: center;
  justify-content: space-between;
  min-height: var(--header-h);
  margin-bottom: var(--sp-6);
}
.nav-drawer__head .brand { color: var(--c-white); }

/* Close button — due span ruotate formano la X */
.nav-drawer__close {
  width: 40px;
  height: 40px;
  position: relative;
  padding: 8px;
  flex-shrink: 0;
  border-radius: var(--radius);
  transition: background var(--t-fast);
}
.nav-drawer__close:hover,
.nav-drawer__close:focus-visible {
  background: rgba(255, 255, 255, 0.08);
}
.nav-drawer__close span {
  position: absolute;
  top: 50%;
  left: 22%;
  right: 22%;
  height: 2px;
  background: var(--c-white);
  border-radius: 1px;
  transform-origin: center;
}
.nav-drawer__close span:nth-child(1) { transform: translateY(-50%) rotate(45deg); }
.nav-drawer__close span:nth-child(2) { transform: translateY(-50%) rotate(-45deg); }

/* Nav list */
.nav-drawer__nav { margin-top: var(--sp-4); }
.nav-drawer__list {
  display: flex;
  flex-direction: column;
  gap: var(--sp-5);                 /* 1.5rem */
  padding: 0;
  margin: 0;
  list-style: none;
}
.nav-drawer__list a {
  display: inline-block;
  font-size: 1.5rem;
  font-weight: 600;
  letter-spacing: -0.01em;
  color: var(--c-white);
  padding-block: 0.35rem;
  transition: color var(--t-fast);
}
.nav-drawer__list a:hover,
.nav-drawer__list a:focus-visible {
  color: var(--c-accent);
}

/* Divider fra link e lang-switch */
.nav-drawer__divider {
  border-top: 1px solid rgba(255, 255, 255, 0.1);
  margin: var(--sp-7) 0 var(--sp-5);
}

/* Lang switch duplicato — bottoni leggermente più grandi per tap mobile */
.lang-switch--drawer { align-self: flex-start; }
.lang-switch--drawer .lang-switch__btn {
  padding: 0.35rem 0.6rem;
  font-size: 1rem;
}

/* =========================================================
   Hero
   ========================================================= */
.hero {
  background: var(--c-ink);
  color: var(--c-white);
  min-height: 90vh;
  display: flex;
  align-items: center;
  position: relative;
  overflow: hidden;
  padding-block: var(--sp-9) var(--sp-8);
  /* subtle industrial pattern overlay */
  background-image:
    radial-gradient(1200px 600px at 85% 10%, rgba(200,117,51,0.08), transparent 60%),
    linear-gradient(180deg, #1B2A3A 0%, #17263A 100%);
}

.hero__inner {
  display: grid;
  grid-template-columns: minmax(0, 1.1fr) minmax(0, 0.9fr);
  gap: var(--sp-8);
  align-items: center;
  width: 100%;
}

.hero__content { max-width: 640px; }

.hero__eyebrow {
  display: inline-block;
  font-family: var(--ff-mono);
  font-size: var(--fs-eyebrow);
  letter-spacing: 0.14em;
  text-transform: uppercase;
  color: var(--c-accent);
  margin-bottom: var(--sp-5);
  padding: 0.35rem 0.6rem;
  border: 1px solid rgba(200,117,51,0.4);
  border-radius: var(--radius);
}

.hero__title {
  font-size: var(--fs-h1);
  font-weight: 800;
  line-height: 1.08;
  letter-spacing: -0.02em;
  color: var(--c-white);
  margin-bottom: var(--sp-5);
  max-width: 18ch;
}

.hero__subtitle {
  font-size: clamp(1.0625rem, 1.4vw, 1.25rem);
  line-height: 1.5;
  color: rgba(255,255,255,0.75);
  max-width: 58ch;
  margin-bottom: var(--sp-7);
}

.hero__ctas {
  display: flex;
  flex-wrap: wrap;
  gap: var(--sp-4);
}

/* Media — foto skid SNCR installato */
.hero__media {
  position: relative;
  align-self: center;
  justify-self: end;
  width: 100%;
  max-width: 560px;
  margin: 0;
}
.hero__picture {
  display: block;
  width: 100%;
  aspect-ratio: 3 / 4;
  max-height: min(720px, 78vh);
  border-radius: var(--radius-lg);
  overflow: hidden;
  border: 1px solid var(--c-border-dk);
  background: #2A3D52;   /* fallback colore prima del load */
  box-shadow: 0 24px 56px rgba(0, 0, 0, 0.45);
}
.hero__img {
  width: 100%;
  height: 100%;
  object-fit: cover;
  object-position: center;
  display: block;
}
.hero__caption {
  position: absolute;
  bottom: var(--sp-4);
  left: var(--sp-4);
  font-family: var(--ff-mono);
  font-size: 0.75rem;
  font-weight: 500;
  letter-spacing: 0.06em;
  color: rgba(255, 255, 255, 0.95);
  padding: 0.5rem 0.8rem;
  background: rgba(10, 18, 28, 0.65);
  backdrop-filter: blur(6px);
  -webkit-backdrop-filter: blur(6px);
  border-radius: var(--radius);
  z-index: 2;
  max-width: calc(100% - var(--sp-6));
  pointer-events: none;
}

/* =========================================================
   Sections (pattern riusabile per le prossime sezioni)
   ========================================================= */

/* Offset per anchor link — tiene conto dell'header sticky + respiro */
main > section[id] {
  scroll-margin-top: calc(var(--header-h) + var(--sp-4));
}

.section {
  padding-block: clamp(var(--sp-8), 9vw, var(--sp-9));
}
.section--steel {
  background: var(--c-steel);
  color: var(--c-text);
}

.section__head {
  max-width: 820px;
  margin-bottom: var(--sp-8);
}
.section__eyebrow {
  display: inline-block;
  font-family: var(--ff-mono);
  font-size: var(--fs-eyebrow);
  letter-spacing: 0.16em;
  text-transform: uppercase;
  color: var(--c-accent);
  margin-bottom: var(--sp-4);
  padding-left: 0.85rem;
  position: relative;
}
.section__eyebrow::before {
  content: "";
  position: absolute;
  left: 0; top: 50%;
  width: 10px;
  height: 2px;
  background: var(--c-accent);
  transform: translateY(-50%);
}
.section__title {
  color: var(--c-ink);
  margin-bottom: var(--sp-5);
  max-width: 24ch;
}
.section__lead {
  font-size: 1.125rem;
  line-height: 1.6;
  color: var(--c-text);
  max-width: 65ch;
}

/* =========================================================
   Feature grid (cards "problema")
   ========================================================= */
.feature-grid {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: var(--sp-5);
}

.feature-card {
  position: relative;
  background: var(--c-white);
  border: 1px solid var(--c-border);
  border-radius: var(--radius);
  padding: var(--sp-6) var(--sp-5) var(--sp-5);
  transition: border-color var(--t-med), transform var(--t-med);
}
.feature-card::before {
  /* filetto rame decorativo in alto */
  content: "";
  position: absolute;
  top: -1px; left: -1px;
  width: 48px;
  height: 3px;
  background: var(--c-accent);
}
.feature-card:hover {
  border-color: var(--c-accent);
}

.feature-card__num {
  font-family: var(--ff-mono);
  font-size: 0.8125rem;
  font-weight: 500;
  letter-spacing: 0.14em;
  color: var(--c-accent);
  margin-bottom: var(--sp-4);
}
.feature-card__title {
  color: var(--c-ink);
  font-size: 1.25rem;
  font-weight: 700;
  margin-bottom: var(--sp-3);
  line-height: 1.25;
}
.feature-card__body {
  color: var(--c-text);
  font-size: 1rem;
  line-height: 1.55;
}

/* =========================================================
   Sezione Referenze — dark, hero stat, due gruppi tabellari
   ========================================================= */
.section--dark {
  background: var(--c-ink);
  color: var(--c-white);
  /* filetto industriale leggero in alto */
  background-image:
    linear-gradient(180deg, #1B2A3A 0%, #17263A 100%);
}
.section__eyebrow--on-dark { color: var(--c-accent); }
.section__eyebrow--on-dark::before { background: var(--c-accent); }
.section__title--on-dark { color: var(--c-white); max-width: 22ch; }
.section__lead--on-dark { color: rgba(255,255,255,0.72); }

/* Header + stat layout */
.refs-header {
  display: grid;
  grid-template-columns: minmax(0, 1fr) auto;
  gap: var(--sp-6);
  align-items: end;
  margin-bottom: var(--sp-8);
  padding-bottom: var(--sp-6);
  border-bottom: 1px solid rgba(255,255,255,0.08);
}
.refs-header__text { max-width: 640px; }

.refs-stat {
  display: flex;
  flex-direction: column;
  align-items: flex-end;
  text-align: right;
  padding: var(--sp-4) var(--sp-5);
  border-left: 3px solid var(--c-accent);
  min-width: 220px;
}
.refs-stat__num {
  font-size: clamp(3.5rem, 7vw, 5.5rem);
  font-weight: 700;
  line-height: 0.9;
  color: var(--c-white);
  letter-spacing: -0.03em;
  display: inline-flex;
  align-items: flex-start;
}
.refs-stat__plus {
  font-size: 0.6em;
  color: var(--c-accent);
  margin-left: 0.05em;
  font-weight: 500;
}
.refs-stat__label {
  margin-top: var(--sp-3);
  font-size: 0.8125rem;
  letter-spacing: 0.14em;
  text-transform: uppercase;
  color: rgba(255,255,255,0.8);
  font-weight: 500;
}
.refs-stat__sub {
  margin-top: var(--sp-2);
  font-size: 0.75rem;
  letter-spacing: 0.12em;
  color: rgba(255,255,255,0.5);
}

/* Grid due gruppi */
.refs-grid {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: var(--sp-6);
  align-items: stretch;
}

.ref-group {
  background: rgba(255,255,255,0.025);
  border: 1px solid rgba(255,255,255,0.08);
  border-radius: var(--radius);
  padding: var(--sp-5);
  display: flex;
  flex-direction: column;
}
.ref-group__head {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: var(--sp-3);
  padding-bottom: var(--sp-4);
  margin-bottom: var(--sp-2);
  border-bottom: 1px solid rgba(255,255,255,0.12);
}
.ref-group__tag {
  display: inline-block;
  font-size: 0.8125rem;
  letter-spacing: 0.16em;
  text-transform: uppercase;
  color: var(--c-accent);
  font-weight: 600;
  line-height: 1.2;
}
.ref-group__count {
  font-size: 0.75rem;
  letter-spacing: 0.1em;
  color: rgba(255,255,255,0.5);
  text-transform: lowercase;
  white-space: nowrap;
  flex-shrink: 0;
}

/* Intro breve sotto il lead */
.refs-intro {
  margin-top: var(--sp-3);
  font-size: 0.875rem;
  line-height: 1.55;
  color: rgba(255,255,255,0.55);
  font-style: italic;
  max-width: 60ch;
}

/* Lista righe referenze — 4 colonne scanner-friendly */
.ref-list {
  list-style: none;
  padding: 0;
  margin: 0;
}

.ref-row {
  display: grid;
  grid-template-columns: 200px minmax(0, 1fr) 80px;
  column-gap: var(--sp-5);
  align-items: center;
  min-height: 60px;
  padding: 0.7rem 0 0.7rem 0.85rem;
  border-bottom: 1px solid rgba(255,255,255,0.07);
  position: relative;
  transition: background var(--t-fast);
}
.ref-row:last-child { border-bottom: none; }

.ref-row::before {
  content: "";
  position: absolute;
  left: 0; top: 0.7rem; bottom: 0.7rem;
  width: 2px;
  background: var(--c-accent);
  transform: scaleY(0);
  transform-origin: center;
  transition: transform var(--t-med);
}
.ref-row:hover { background: rgba(200,117,51,0.04); }
.ref-row:hover::before { transform: scaleY(1); }

/* Col 1 — slot badge con stack verticale (badge + eventuale sottotesto/tag) */
.ref-row__spec {
  justify-self: start;
  min-width: 0;
  display: flex;
  flex-direction: column;
  align-items: flex-start;
  gap: 0.3rem;
}

/* Il badge vero e proprio: monospace, bordo rame, min-width per colonna uniforme */
.ref-badge {
  display: inline-block;
  color: var(--c-white);
  font-family: var(--ff-mono);
  font-size: 0.875rem;
  font-weight: 500;
  line-height: 1.25;
  letter-spacing: 0.02em;
  padding: 0.3rem 0.65rem;
  background: rgba(200,117,51,0.12);
  border: 1px solid rgba(200,117,51,0.32);
  border-radius: 2px;
  white-space: nowrap;
  text-align: center;
  min-width: 92px;
}
/* Variante per spec molto lunga (Nm³/h composta): font leggermente più piccolo */
.ref-badge--wide {
  font-size: 0.8125rem;
  padding: 0.3rem 0.6rem;
  letter-spacing: 0.01em;
}

/* Sottotesto sotto il badge (es. "+3,2 MW espansione prevista") */
.ref-row__subtype {
  display: block;
  font-size: 0.6875rem;
  font-weight: 400;
  letter-spacing: 0.04em;
  color: rgba(255,255,255,0.5);
  line-height: 1.3;
  padding-left: 0.1rem;
}

/* Chip sotto il badge (es. REVAMPING) */
.ref-row__tag {
  display: inline-block;
  font-size: 0.65rem;
  font-weight: 600;
  letter-spacing: 0.16em;
  text-transform: uppercase;
  color: var(--c-accent);
  padding: 0.12rem 0.45rem;
  border: 1px solid rgba(200,117,51,0.4);
  border-radius: 2px;
  line-height: 1.3;
  white-space: nowrap;
}

/* Col 3 — località */
.ref-row__loc {
  color: rgba(255,255,255,0.72);
  font-size: 0.875rem;
  white-space: nowrap;
  overflow: hidden;
  text-overflow: ellipsis;
}

/* Col 4 — anno */
.ref-row__year {
  color: var(--c-accent);
  font-weight: 500;
  font-size: 0.875rem;
  text-align: right;
  letter-spacing: 0.02em;
  justify-self: end;
  min-width: 0;
}

/* =========================================================
   Sezione Contatti — form + blocco contatti aziendali
   ========================================================= */
.contact-grid {
  display: grid;
  grid-template-columns: minmax(0, 1.35fr) minmax(0, 1fr);
  gap: var(--sp-7);
  align-items: start;
}

/* ---- Form ---- */
.contact-form {
  display: flex;
  flex-direction: column;
  gap: var(--sp-4);
}
.form-row {
  display: flex;
  flex-direction: column;
}
.form-row--split {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: var(--sp-4);
}
.form-row--actions {
  display: flex;
  flex-wrap: wrap;
  align-items: center;
  gap: var(--sp-4);
  margin-top: var(--sp-3);
}

.field { display: flex; flex-direction: column; min-width: 0; }
.field__label {
  display: inline-flex;
  align-items: baseline;
  gap: 0.35rem;
  font-size: 0.8125rem;
  font-weight: 600;
  letter-spacing: 0.04em;
  color: var(--c-ink);
  margin-bottom: 0.45rem;
}
.field__req { color: var(--c-accent); font-weight: 700; }
.field__hint {
  font-size: 0.75rem;
  font-weight: 400;
  color: var(--c-text-muted);
  letter-spacing: 0;
}

.field input,
.field select,
.field textarea {
  width: 100%;
  padding: 0.75rem 0.9rem;
  font-size: 0.9375rem;
  font-family: inherit;
  color: var(--c-ink);
  background: var(--c-white);
  border: 1px solid var(--c-border);
  border-radius: var(--radius);
  transition: border-color var(--t-fast), box-shadow var(--t-fast);
  appearance: none;
  -webkit-appearance: none;
}
.field textarea { resize: vertical; min-height: 120px; line-height: 1.5; }

/* Select custom chevron */
.field select {
  background-image: url("data:image/svg+xml;utf8,<svg xmlns='http://www.w3.org/2000/svg' width='12' height='8' viewBox='0 0 12 8' fill='none'><path d='M1 1.5L6 6.5L11 1.5' stroke='%23374151' stroke-width='1.5' stroke-linecap='square'/></svg>");
  background-repeat: no-repeat;
  background-position: right 0.9rem center;
  padding-right: 2.25rem;
}

.field input::placeholder,
.field textarea::placeholder { color: var(--c-text-muted); }

.field input:focus,
.field select:focus,
.field textarea:focus {
  outline: none;
  border-color: var(--c-accent);
  box-shadow: 0 0 0 3px rgba(200,117,51,0.15);
}

/* Error state */
.field.has-error input,
.field.has-error select,
.field.has-error textarea {
  border-color: #C23B3B;
  box-shadow: 0 0 0 3px rgba(194,59,59,0.1);
}
.field-check.has-error .field-check__text { color: #9E2B2B; }
.field-check.has-error input[type="checkbox"] { outline: 2px solid #C23B3B; outline-offset: 2px; }

/* Checkbox GDPR */
.field-check {
  display: grid;
  grid-template-columns: auto 1fr;
  gap: 0.7rem;
  cursor: pointer;
  align-items: start;
  padding: 0.25rem 0;
}
.field-check input[type="checkbox"] {
  appearance: none;
  -webkit-appearance: none;
  width: 18px;
  height: 18px;
  border: 1.5px solid var(--c-border);
  border-radius: 2px;
  background: var(--c-white);
  display: inline-grid;
  place-content: center;
  margin-top: 0.15rem;
  cursor: pointer;
  transition: border-color var(--t-fast), background var(--t-fast);
  flex-shrink: 0;
}
.field-check input[type="checkbox"]::before {
  content: "";
  width: 10px;
  height: 10px;
  background: var(--c-accent);
  border-radius: 1px;
  transform: scale(0);
  transition: transform var(--t-fast);
}
.field-check input[type="checkbox"]:checked {
  border-color: var(--c-accent);
}
.field-check input[type="checkbox"]:checked::before { transform: scale(1); }
.field-check input[type="checkbox"]:focus-visible {
  outline: 2px solid var(--c-accent);
  outline-offset: 2px;
}
.field-check__text {
  font-size: 0.8125rem;
  line-height: 1.55;
  color: var(--c-text);
}

/* Status (loading / success / error) — messaggio globale del form */
.form-status {
  padding: 0.85rem 1rem;
  border-radius: var(--radius);
  font-size: 0.875rem;
  line-height: 1.5;
  border: 1px solid var(--c-border);
  border-left: 3px solid var(--c-text-muted);
  background: #F3F4F6;
  color: var(--c-text);
}
.form-status[hidden] { display: none; }
.form-status--loading {
  background: #F3F4F6;
  border-color: var(--c-border);
  border-left-color: var(--c-text-muted);
  color: var(--c-text);
}
.form-status--loading::before {
  content: "";
  display: inline-block;
  width: 10px; height: 10px;
  margin-right: 0.55rem;
  border-radius: 50%;
  background: var(--c-text-muted);
  animation: pulse 1.2s ease-in-out infinite;
  vertical-align: middle;
}
@keyframes pulse {
  0%, 100% { opacity: 0.35; transform: scale(0.9); }
  50%      { opacity: 1;    transform: scale(1.1); }
}
.form-status--error {
  background: #FBEBEB;
  border-color: #E7B4B4;
  border-left-color: #C23B3B;
  color: #9E2B2B;
}
.form-status--success {
  background: #F5EFE9;
  border-color: rgba(200,117,51,0.35);
  border-left-color: var(--c-accent);
  color: var(--c-ink);
  font-weight: 500;
}

/* Submit area */
.form-row--actions .btn { padding-inline: var(--sp-6); }
.form-row--actions .btn:disabled {
  opacity: 0.7;
  cursor: not-allowed;
}

/* ---- Blocco contatti aziendali ---- */
.contact-info {
  background: var(--c-ink);
  color: var(--c-white);
  padding: var(--sp-6);
  border-radius: var(--radius);
  position: sticky;
  top: calc(var(--header-h) + var(--sp-4));
}
.contact-info__name {
  font-size: 1.125rem;
  font-weight: 700;
  color: var(--c-white);
  padding-bottom: var(--sp-4);
  margin-bottom: var(--sp-4);
  border-bottom: 1px solid rgba(255,255,255,0.12);
  letter-spacing: 0.01em;
}
.contact-info__list {
  display: flex;
  flex-direction: column;
  gap: var(--sp-4);
  margin: 0;
}
.contact-info__item { margin: 0; }
.contact-info__item dt {
  font-family: var(--ff-mono);
  font-size: 0.6875rem;
  font-weight: 600;
  letter-spacing: 0.16em;
  text-transform: uppercase;
  color: var(--c-accent);
  margin-bottom: 0.35rem;
}
.contact-info__item dd {
  margin: 0;
  font-size: 0.9375rem;
  line-height: 1.5;
  color: rgba(255,255,255,0.9);
}
.contact-info__item a {
  color: var(--c-white);
  text-decoration: none;
  border-bottom: 1px solid rgba(255,255,255,0.2);
  transition: border-color var(--t-fast), color var(--t-fast);
}
.contact-info__item a:hover,
.contact-info__item a:focus-visible {
  color: var(--c-accent);
  border-bottom-color: var(--c-accent);
}

/* =========================================================
   Footer
   ========================================================= */
.site-footer {
  background: #14212F;
  color: rgba(255,255,255,0.75);
  padding: var(--sp-7) 0 var(--sp-6);
  font-size: 0.8125rem;
  line-height: 1.55;
  border-top: 1px solid rgba(255,255,255,0.06);
}
.site-footer__inner {
  display: grid;
  grid-template-columns: minmax(0, 1.25fr) minmax(0, 1fr);
  gap: var(--sp-6);
  align-items: start;
}
.site-footer__legal p { margin-bottom: 0.15rem; color: rgba(255,255,255,0.8); }
.site-footer__legal .mono {
  font-size: 0.75rem;
  color: rgba(255,255,255,0.6);
  letter-spacing: 0.02em;
  margin-top: 0.2rem;
}
.site-footer__name strong {
  color: var(--c-white);
  font-weight: 700;
  letter-spacing: 0.02em;
}
.site-footer__privacy {
  font-size: 0.75rem;
  line-height: 1.55;
  color: rgba(255,255,255,0.55);
  padding-left: var(--sp-4);
  border-left: 1px solid rgba(255,255,255,0.1);
  max-width: 60ch;
}
.site-footer__privacy a {
  color: rgba(255,255,255,0.8);
  border-bottom: 1px solid rgba(255,255,255,0.25);
  transition: color var(--t-fast), border-color var(--t-fast);
}
.site-footer__privacy a:hover,
.site-footer__privacy a:focus-visible {
  color: var(--c-accent);
  border-bottom-color: var(--c-accent);
}

/* =========================================================
   Sezione Chi siamo — narrativa + quick facts
   ========================================================= */
.about-grid {
  display: grid;
  grid-template-columns: minmax(0, 1.35fr) minmax(300px, 1fr);
  gap: var(--sp-8);
  align-items: start;
}

/* Narrativa a sinistra */
.about-narrative .section__eyebrow { margin-bottom: var(--sp-4); }
.about-narrative .section__title {
  margin-bottom: var(--sp-6);
  max-width: none;
  font-size: clamp(2rem, 3.2vw, 2.75rem);
  letter-spacing: -0.02em;
}

.about-narrative__body {
  display: flex;
  flex-direction: column;
  gap: var(--sp-5);
  max-width: 58ch;
}
.about-narrative__body p {
  font-size: 1.0625rem;
  line-height: 1.7;
  color: var(--c-text);
}

/* Colonna facts a destra */
.about-facts {
  display: flex;
  flex-direction: column;
  gap: var(--sp-4);
}

.fact-card {
  background: var(--c-white);
  border: 1px solid var(--c-border);
  border-left: 3px solid var(--c-accent);
  border-radius: var(--radius);
  padding: var(--sp-5) var(--sp-6);
  display: flex;
  flex-direction: column;
  gap: 0.25rem;
}

.fact-card__value {
  font-family: var(--ff-mono);
  font-size: clamp(2rem, 4vw, 3rem);
  font-weight: 600;
  color: var(--c-accent);
  line-height: 1;
  letter-spacing: -0.01em;
  display: inline-flex;
  align-items: flex-start;
  margin-bottom: var(--sp-3);
}
.fact-card__plus {
  font-size: 0.55em;
  font-weight: 500;
  color: var(--c-accent);
  margin-left: 0.05em;
  letter-spacing: 0;
}
.fact-card__label {
  font-family: var(--ff-mono);
  font-size: 0.75rem;
  font-weight: 600;
  letter-spacing: 0.14em;
  text-transform: uppercase;
  color: var(--c-ink);
  line-height: 1.25;
}
.fact-card__sub {
  font-size: 0.8125rem;
  color: var(--c-text-muted);
  line-height: 1.35;
  margin-top: 0.15rem;
}

/* =========================================================
   Sezione Processo — timeline verticale con rail + numeri
   ========================================================= */
.process-timeline {
  list-style: none;
  padding: 0;
  margin: 0;
  max-width: 860px;
  counter-reset: step;
}

.process-step {
  display: grid;
  grid-template-columns: 68px 28px minmax(0, 1fr);
  column-gap: 0;
  padding-bottom: var(--sp-7);
  position: relative;
}
.process-step:last-child { padding-bottom: 0; }

/* Numero step — colonna 1, allineato a destra */
.process-step__num {
  grid-column: 1;
  font-family: var(--ff-mono);
  font-size: 1.875rem;
  font-weight: 600;
  color: var(--c-accent);
  line-height: 1;
  text-align: right;
  padding-right: var(--sp-4);
  padding-top: 0.2rem;
  letter-spacing: 0.02em;
}

/* Rail — colonna 2, contiene la linea verticale + la stazione rotonda */
.process-step__rail {
  grid-column: 2;
  position: relative;
  display: block;
}
/* Linea verticale che collega uno step al successivo */
.process-step__rail::before {
  content: "";
  position: absolute;
  left: 50%;
  top: 1.4rem;
  bottom: calc(-1 * var(--sp-7) + 0.2rem);
  width: 1px;
  background: var(--c-border);
  transform: translateX(-50%);
}
/* L'ultimo step non proietta la linea verso il basso */
.process-step--last .process-step__rail::before { display: none; }

/* Stazione (pallino rame con anima bianca) */
.process-step__rail::after {
  content: "";
  position: absolute;
  left: 50%;
  top: 0.55rem;
  width: 11px;
  height: 11px;
  border-radius: 50%;
  background: var(--c-white);
  border: 2px solid var(--c-accent);
  transform: translateX(-50%);
  z-index: 1;
}

/* Contenuto — colonna 3 */
.process-step__content {
  grid-column: 3;
  padding-left: var(--sp-5);
  padding-top: 0.05rem;
}
.process-step__title {
  font-size: 1.1875rem;
  font-weight: 700;
  color: var(--c-ink);
  line-height: 1.25;
  margin-bottom: var(--sp-2);
}
.process-step__body {
  font-size: 1rem;
  line-height: 1.6;
  color: var(--c-text);
  max-width: 62ch;
}

/* =========================================================
   Sezione Cosa facciamo — service grid
   ========================================================= */
.service-grid {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 1px;                    /* hairline tra card per look "catalogo" */
  background: var(--c-border); /* diventa il filo di separazione */
  border: 1px solid var(--c-border);
  border-radius: var(--radius);
  overflow: hidden;
}

.service-card {
  background: var(--c-white);
  padding: var(--sp-6) var(--sp-5);
  display: flex;
  flex-direction: column;
  gap: var(--sp-3);
  transition: background var(--t-med);
  min-height: 220px;
}
.service-card:hover {
  background: #FAFBFC;
}

.service-card__glyph {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  width: 40px;
  height: 40px;
  color: var(--c-accent);
  margin-bottom: var(--sp-2);
  border: 1px solid rgba(200,117,51,0.25);
  border-radius: 2px;
  background: rgba(200,117,51,0.04);
  flex-shrink: 0;
}
.service-card__glyph svg {
  width: 22px;
  height: 22px;
  display: block;
}

.service-card__title {
  font-size: 1.0625rem;
  font-weight: 700;
  color: var(--c-ink);
  line-height: 1.3;
}
.service-card__body {
  font-size: 0.9375rem;
  line-height: 1.55;
  color: var(--c-text);
}

/* =========================================================
   Sezione Tecnologia — equazione, scheda dati, callout
   ========================================================= */

/* screen-reader only */
.sr-only {
  position: absolute;
  width: 1px; height: 1px;
  padding: 0; margin: -1px;
  overflow: hidden;
  clip: rect(0,0,0,0);
  white-space: nowrap;
  border: 0;
}

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

.tech-body {
  max-width: 820px;
  margin-bottom: var(--sp-6);
}
.tech-body__p {
  font-size: 1.0625rem;
  line-height: 1.65;
  color: var(--c-text);
  margin-bottom: var(--sp-5);
}
.tech-body__p em { font-style: italic; color: var(--c-ink); font-weight: 500; }

/* ---------- Equazione chimica ---------- */
.equation {
  margin: var(--sp-6) 0;
  padding: 0;
}
.equation__inner {
  background: var(--c-steel);
  border: 1px solid var(--c-border);
  border-left: 3px solid var(--c-accent);
  border-radius: var(--radius);
  padding: var(--sp-6) var(--sp-5);
  display: flex;
  align-items: center;
  justify-content: center;
  min-height: 110px;
  overflow-x: auto;
}
.equation__text {
  font-family: var(--ff-mono);
  font-size: clamp(0.95rem, 1.6vw, 1.25rem);
  font-weight: 500;
  color: var(--c-ink);
  text-align: center;
  letter-spacing: 0.02em;
  line-height: 1.4;
  display: inline-flex;
  align-items: center;
  flex-wrap: wrap;
  justify-content: center;
  gap: 0.5em;
  white-space: nowrap;
}
.equation__arrow {
  display: inline-block;
  margin: 0 0.35em;
  color: var(--c-accent);
  font-weight: 700;
  font-size: 1.2em;
}
.equation__caption {
  margin-top: var(--sp-3);
  text-align: center;
  font-size: 0.8125rem;
  letter-spacing: 0.08em;
  text-transform: uppercase;
  color: var(--c-text-muted);
}

/* ---------- Grid inferiore: spec table + callout ---------- */
.tech-grid {
  display: grid;
  grid-template-columns: 1.3fr 1fr;
  gap: var(--sp-5);
  align-items: stretch;
}

/* ---------- Spec sheet ("schedina tecnica" industriale) ---------- */
.spec-sheet {
  background: var(--c-ink);
  color: var(--c-white);
  border-radius: var(--radius);
  overflow: hidden;
  display: flex;
  flex-direction: column;
}
.spec-sheet__head {
  padding: var(--sp-5) var(--sp-5) var(--sp-4);
  border-bottom: 1px solid rgba(255,255,255,0.12);
}
.spec-sheet__tag {
  display: inline-block;
  font-size: 0.75rem;
  letter-spacing: 0.18em;
  text-transform: uppercase;
  color: var(--c-accent);
  margin-bottom: var(--sp-2);
}
.spec-sheet__title {
  font-size: 1.25rem;
  font-weight: 700;
  color: var(--c-white);
  line-height: 1.25;
}
.spec-table {
  width: 100%;
  border-collapse: collapse;
  font-size: 0.9375rem;
}
.spec-table tr {
  border-bottom: 1px solid rgba(255,255,255,0.08);
}
.spec-table tr:last-child { border-bottom: none; }
.spec-table th,
.spec-table td {
  padding: 0.95rem var(--sp-5);
  text-align: left;
  vertical-align: top;
}
.spec-table th {
  font-weight: 500;
  color: rgba(255,255,255,0.7);
  width: 52%;
}
.spec-table td {
  color: var(--c-white);
  font-weight: 500;
  letter-spacing: 0.01em;
}

/* ---------- Callout "Perché SNCR" ---------- */
.why-callout {
  background: #F5EFE9;     /* sfumatura calda molto leggera, in famiglia col rame */
  border-left: 3px solid var(--c-accent);
  border-radius: var(--radius);
  padding: var(--sp-6) var(--sp-5);
  display: flex;
  flex-direction: column;
}
.why-callout__eyebrow {
  font-size: 0.75rem;
  letter-spacing: 0.18em;
  text-transform: uppercase;
  color: var(--c-accent-dk);
  margin-bottom: var(--sp-3);
}
.why-callout__title {
  font-size: 1.25rem;
  font-weight: 700;
  color: var(--c-ink);
  line-height: 1.25;
  margin-bottom: var(--sp-4);
}
.why-callout__body {
  font-size: 1rem;
  line-height: 1.6;
  color: var(--c-text);
}

/* =========================================================
   Responsive
   ========================================================= */
@media (max-width: 960px) {
  .site-nav,
  .lang-switch:not(.lang-switch--drawer) { display: none; }
  .nav-toggle { display: flex; margin-left: auto; }

  .hero__inner {
    grid-template-columns: 1fr;
    gap: var(--sp-6);
  }
  .hero__media {
    order: 2;
    justify-self: center;
    max-width: 420px;
    margin-inline: auto;
  }
  .hero__picture { max-height: 68vh; }
  .hero__content { order: 1; max-width: none; }

  .feature-grid {
    grid-template-columns: repeat(2, 1fr);
    gap: var(--sp-4);
  }

  .tech-grid {
    grid-template-columns: 1fr;
  }

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

  .about-grid {
    grid-template-columns: 1fr;
    gap: var(--sp-7);
  }

  .contact-grid {
    grid-template-columns: 1fr;
    gap: var(--sp-6);
  }
  .contact-info { position: static; }

  .site-footer__inner {
    grid-template-columns: 1fr;
    gap: var(--sp-5);
  }

  .process-step {
    grid-template-columns: 48px 22px minmax(0, 1fr);
    padding-bottom: var(--sp-6);
  }
  .process-step__num {
    font-size: 1.5rem;
    padding-right: var(--sp-3);
  }
  .process-step__content { padding-left: var(--sp-4); }
  .process-step__rail::before {
    bottom: calc(-1 * var(--sp-6) + 0.2rem);
  }

  /* Referenze: stack header+stat, ma due gruppi restano affiancati se lo spazio regge */
  .refs-header {
    grid-template-columns: 1fr;
    align-items: start;
  }
  .refs-stat {
    align-items: flex-start;
    text-align: left;
    border-left: none;
    border-top: 1px solid rgba(255,255,255,0.12);
    padding: var(--sp-5) 0 0;
    min-width: 0;
  }
  .refs-grid {
    grid-template-columns: 1fr;
    gap: var(--sp-5);
  }
}

@media (max-width: 600px) {
  :root { --header-h: 64px; }

  .container { padding-inline: var(--sp-4); }

  .hero {
    min-height: calc(100svh - var(--header-h));
    padding-block: var(--sp-7) var(--sp-6);
  }
  .hero__title { max-width: none; }
  .hero__ctas { gap: var(--sp-3); }
  .hero__ctas .btn { width: 100%; }

  .feature-grid {
    grid-template-columns: 1fr;
  }
  .section__head { margin-bottom: var(--sp-6); }

  .equation__text {
    white-space: normal;
    gap: 0.35em;
  }
  .equation__inner { padding: var(--sp-5) var(--sp-4); }

  .spec-sheet__head,
  .spec-table th,
  .spec-table td { padding-inline: var(--sp-4); }
  .spec-table th { width: 56%; }

  .why-callout { padding: var(--sp-5) var(--sp-4); }

  .service-grid { grid-template-columns: 1fr; }
  .service-card { min-height: 0; padding: var(--sp-5) var(--sp-4); }

  .fact-card { padding: var(--sp-4) var(--sp-5); }
  .fact-card__value { margin-bottom: var(--sp-2); }

  .form-row--split { grid-template-columns: 1fr; gap: var(--sp-4); }
  .form-row--actions { flex-direction: column; align-items: stretch; }
  .form-row--actions .btn { width: 100%; }
  .contact-info { padding: var(--sp-5); }

  .process-step {
    grid-template-columns: 40px 18px minmax(0, 1fr);
    padding-bottom: var(--sp-5);
  }
  .process-step__num {
    font-size: 1.25rem;
    padding-right: var(--sp-2);
  }
  .process-step__content { padding-left: var(--sp-3); }
  .process-step__title { font-size: 1.0625rem; }
  .process-step__body { font-size: 0.9375rem; }
  .process-step__rail::before {
    bottom: calc(-1 * var(--sp-5) + 0.2rem);
  }

  /* Referenze mobile: badge | loc | year su una riga, compatto */
  .ref-row {
    grid-template-columns: minmax(0, auto) minmax(0, 1fr) auto;
    column-gap: var(--sp-3);
    min-height: 0;
    padding: 0.8rem 0 0.8rem 0.6rem;
  }
  .ref-row::before { top: 0.8rem; bottom: 0.8rem; }

  .ref-group { padding: var(--sp-4); }
  .ref-badge { min-width: 0; font-size: 0.8125rem; }
  .ref-badge--wide { font-size: 0.75rem; }
  .ref-row__subtype { font-size: 0.625rem; }
  .ref-row__loc { font-size: 0.8125rem; text-align: right; }
  .ref-row__year { font-size: 0.8125rem; }
}