/* ============================================================
   Steel On It — Sito istituzionale
   Palette
   Verde principale   #1C9770
   Verde profondo     #16795A  (superfici con testo, AA su bianco)
   Verde lime         #93CB52
   Verde chiaro       #7AD180
   Verde acqua        #7AD1C3
   Titoli             #030303
   Testi              #464646
   Sfondo             #FFFFFF
   Bianco sporco      #F7F9F7
   ============================================================ */

:root {
  --green: #1C9770;
  --green-deep: #16795A;
  --green-deeper: #115E46;
  --lime: #93CB52;
  --green-light: #7AD180;
  --green-water: #7AD1C3;
  --ink: #030303;
  --body: #464646;
  --bg: #ffffff;
  --bg-soft: #f7f9f7;
  --white-dim: #f7f9f7;
  --line: #e4e8e5;

  --container: 1180px;
  --radius: 4px;
  --radius-lg: 8px;
  --ease: cubic-bezier(.22, .61, .36, 1);

  --font: "Segoe UI", Roboto, -apple-system, BlinkMacSystemFont, "Helvetica Neue",
    Arial, "Noto Sans", sans-serif;

  --shadow-sm: 0 1px 2px rgba(3, 3, 3, .06), 0 4px 14px rgba(3, 3, 3, .05);
  --shadow-md: 0 12px 40px rgba(3, 3, 3, .12);
}

*, *::before, *::after { box-sizing: border-box; }

html { scroll-behavior: smooth; }
@media (prefers-reduced-motion: reduce) {
  html { scroll-behavior: auto; }
  *, *::before, *::after { animation-duration: .001ms !important; transition-duration: .001ms !important; }
}

body {
  margin: 0;
  font-family: var(--font);
  color: var(--body);
  background: var(--bg);
  line-height: 1.65;
  -webkit-font-smoothing: antialiased;
  text-rendering: optimizeLegibility;
}

img { max-width: 100%; height: auto; display: block; }
a { color: var(--green-deep); }

h1, h2, h3 {
  color: var(--ink);
  line-height: 1.12;
  letter-spacing: -0.02em;
  font-weight: 700;
  margin: 0 0 .5em;
}
h1 { font-size: clamp(2.1rem, 1.4rem + 3.2vw, 3.75rem); }
h2 { font-size: clamp(1.7rem, 1.2rem + 2.2vw, 2.6rem); }
h3 { font-size: clamp(1.15rem, 1rem + .6vw, 1.4rem); }
p { margin: 0 0 1rem; }

.container {
  width: 100%;
  max-width: var(--container);
  margin-inline: auto;
  padding-inline: clamp(1.15rem, 5vw, 2.5rem);
}

.section { padding-block: clamp(3.75rem, 2rem + 8vw, 7rem); }
.section--soft { background: var(--bg-soft); }

.eyebrow {
  display: inline-block;
  font-size: .8rem;
  font-weight: 700;
  letter-spacing: .18em;
  text-transform: uppercase;
  color: var(--green-deep);
  margin-bottom: 1rem;
}
.section-lead {
  max-width: 46ch;
  font-size: 1.075rem;
}

/* ---------- Skip link ---------- */
.skip-link {
  position: absolute;
  left: 1rem; top: -3.5rem;
  background: var(--ink);
  color: #fff;
  padding: .6rem 1rem;
  border-radius: var(--radius);
  z-index: 200;
  transition: top .18s var(--ease);
}
.skip-link:focus { top: 1rem; }

/* ---------- Buttons ---------- */
.btn {
  --btn-bg: var(--green-deep);
  --btn-fg: #ffffff;
  display: inline-flex;
  align-items: center;
  gap: .55rem;
  padding: .95rem 1.6rem;
  background: var(--btn-bg);
  color: var(--btn-fg);
  font-weight: 600;
  font-size: .98rem;
  letter-spacing: .01em;
  text-decoration: none;
  border: 1px solid transparent;
  border-radius: var(--radius);
  cursor: pointer;
  transition: background .18s var(--ease), transform .18s var(--ease), box-shadow .18s var(--ease);
}
.btn:hover { background: var(--green-deeper); transform: translateY(-2px); box-shadow: var(--shadow-sm); }
.btn:active { transform: translateY(0); }
.btn--ghost {
  --btn-bg: transparent;
  --btn-fg: var(--ink);
  border-color: var(--line);
}
.btn--ghost:hover { --btn-bg: var(--bg-soft); border-color: #cfd6d1; }
.btn--on-green {
  --btn-bg: #ffffff;
  --btn-fg: var(--green-deeper);
}
.btn--on-green:hover { background: var(--white-dim); }
.btn--outline-light {
  --btn-bg: transparent;
  --btn-fg: #ffffff;
  border-color: rgba(255, 255, 255, .55);
}
.btn--outline-light:hover {
  --btn-bg: rgba(255, 255, 255, .14);
  --btn-fg: #ffffff;
  border-color: #ffffff;
}
.btn .btn__arrow { transition: transform .18s var(--ease); }
.btn:hover .btn__arrow { transform: translateX(3px); }

:focus-visible {
  outline: 3px solid var(--green-deep);
  outline-offset: 3px;
  border-radius: 2px;
}
.on-dark :focus-visible,
.hero :focus-visible,
.band-green :focus-visible,
.contact :focus-visible,
.site-footer :focus-visible { outline-color: var(--green-water); }

/* ---------- Header ---------- */
.site-header {
  position: sticky;
  top: 0;
  z-index: 100;
  background: rgba(255, 255, 255, .9);
  backdrop-filter: saturate(180%) blur(10px);
  border-bottom: 1px solid var(--line);
}
.site-header__inner {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 1rem;
  min-height: 68px;
}
.brand {
  display: inline-flex;
  align-items: center;
  gap: .7rem;
  text-decoration: none;
  color: var(--ink);
  font-weight: 700;
  letter-spacing: -0.01em;
}
.brand img { width: 34px; height: 34px; }
.brand span { font-size: 1.05rem; white-space: nowrap; }

.header-actions { display: flex; align-items: center; gap: .9rem; }
.nav { display: flex; align-items: center; gap: 2rem; }
.nav__links {
  display: flex;
  gap: 1.75rem;
  list-style: none;
  margin: 0;
  padding: 0;
}
.nav__links a {
  text-decoration: none;
  color: var(--body);
  font-weight: 600;
  font-size: .95rem;
  padding: .35rem 0;
  border-bottom: 2px solid transparent;
  transition: color .15s var(--ease), border-color .15s var(--ease);
}
.nav__links a:hover { color: var(--ink); border-color: var(--green); }

/* language switcher */
.lang {
  display: inline-flex;
  align-items: center;
  border: 1px solid var(--line);
  border-radius: var(--radius);
  overflow: hidden;
}
.lang a {
  padding: .4rem .6rem;
  font-size: .82rem;
  font-weight: 700;
  letter-spacing: .05em;
  text-decoration: none;
  color: var(--body);
  background: #fff;
  transition: background .15s var(--ease), color .15s var(--ease);
}
.lang a + a { border-left: 1px solid var(--line); }
.lang a:hover { background: var(--bg-soft); color: var(--ink); }
.lang a[aria-current="true"] { background: var(--green-deep); color: #fff; }

/* mobile nav toggle */
.nav-toggle {
  display: none;
  width: 44px; height: 44px;
  align-items: center; justify-content: center;
  background: transparent;
  border: 1px solid var(--line);
  border-radius: var(--radius);
  cursor: pointer;
}
.nav-toggle svg { width: 22px; height: 22px; stroke: var(--ink); }
.nav-toggle .icon-close { display: none; }
.nav-toggle[aria-expanded="true"] .icon-open { display: none; }
.nav-toggle[aria-expanded="true"] .icon-close { display: block; }

@media (max-width: 860px) {
  .nav-toggle { display: inline-flex; }
  .nav {
    position: absolute;
    left: 0; right: 0; top: 100%;
    flex-direction: column;
    align-items: stretch;
    gap: 0;
    background: #fff;
    border-bottom: 1px solid var(--line);
    box-shadow: var(--shadow-md);
    padding: .5rem clamp(1.15rem, 5vw, 2.5rem) 1.25rem;
    transform: translateY(-8px);
    opacity: 0;
    pointer-events: none;
    transition: opacity .18s var(--ease), transform .18s var(--ease);
  }
  .nav.is-open { opacity: 1; transform: translateY(0); pointer-events: auto; }
  .nav__links { flex-direction: column; gap: 0; }
  .nav__links a { padding: .85rem 0; border-bottom: 1px solid var(--line); }
  .nav__links li:last-child a { border-bottom: 0; }
}

/* ---------- Hero ---------- */
.hero {
  position: relative;
  display: flex;
  align-items: center;
  min-height: min(88vh, 760px);
  color: #fff;
  isolation: isolate;
  overflow: hidden;
}
.hero__media {
  position: absolute;
  inset: 0;
  z-index: -2;
  width: 100%;
  height: 100%;
  object-fit: cover;
}
.hero::after {
  content: "";
  position: absolute;
  inset: 0;
  z-index: -1;
  background:
    linear-gradient(180deg, rgba(3, 3, 3, .30) 0%, rgba(3, 3, 3, .10) 40%, rgba(17, 94, 70, .55) 100%),
    linear-gradient(90deg, rgba(3, 3, 3, .72) 0%, rgba(3, 3, 3, .28) 55%, rgba(3, 3, 3, .05) 100%);
}
.hero__inner { padding-block: clamp(4rem, 10vw, 7rem); }
.hero h1 { color: #fff; max-width: 15ch; }
.hero__eyebrow { color: var(--green-water); }
.hero p {
  color: var(--white-dim);
  font-size: clamp(1.05rem, .95rem + .5vw, 1.3rem);
  max-width: 44ch;
  margin-bottom: 2rem;
}
.hero__actions { display: flex; flex-wrap: wrap; gap: .9rem; }

/* ---------- Generic split layout ---------- */
.split {
  display: grid;
  grid-template-columns: 1.05fr .95fr;
  gap: clamp(2rem, 5vw, 4.5rem);
  align-items: center;
}
.split--reverse .split__media { order: -1; }
@media (max-width: 820px) {
  .split { grid-template-columns: 1fr; }
  .split--reverse .split__media { order: 0; }
}
.split__media img {
  width: 100%;
  border-radius: var(--radius-lg);
  box-shadow: var(--shadow-md);
  aspect-ratio: 4 / 3;
  object-fit: cover;
}
.split__media figure { margin: 0; }
figure figcaption,
.figcaption {
  margin-top: .6rem;
  font-size: .82rem;
  color: #6a6f6b;
  letter-spacing: .01em;
}

/* ---------- Pillars ---------- */
.pillars {
  list-style: none;
  margin: 2rem 0 0;
  padding: 0;
  display: grid;
  gap: 1.4rem 2rem;
  grid-template-columns: repeat(2, 1fr);
}
@media (max-width: 520px) { .pillars { grid-template-columns: 1fr; } }
.pillars li { padding-left: 1.4rem; position: relative; }
.pillars li::before {
  content: "";
  position: absolute;
  left: 0; top: .55em;
  width: .6rem; height: .6rem;
  background: var(--green);
  border-radius: 2px;
  transform: rotate(45deg);
}
.pillars strong { display: block; color: var(--ink); font-size: 1.02rem; }
.pillars span { font-size: .95rem; }

/* ---------- Production feature ---------- */
.feature-card {
  background: #fff;
  border: 1px solid var(--line);
  border-radius: var(--radius-lg);
  overflow: hidden;
  box-shadow: var(--shadow-sm);
}
.feature-card__grid {
  display: grid;
  grid-template-columns: 1.1fr 1fr;
}
@media (max-width: 820px) { .feature-card__grid { grid-template-columns: 1fr; } }
.feature-card__media { position: relative; min-height: 320px; }
.feature-card__media img { width: 100%; height: 100%; object-fit: cover; position: absolute; inset: 0; }
.feature-card__body { padding: clamp(1.6rem, 1rem + 2.5vw, 3rem); }
.feature-card__tag {
  display: inline-block;
  font-size: .74rem;
  font-weight: 700;
  letter-spacing: .14em;
  text-transform: uppercase;
  color: var(--green-deep);
  background: rgba(28, 151, 112, .1);
  padding: .35rem .7rem;
  border-radius: 999px;
  margin-bottom: 1rem;
}
.feature-card__body ul {
  margin: 1.2rem 0 0;
  padding: 0;
  list-style: none;
  display: grid;
  gap: .6rem;
}
.feature-card__body li { padding-left: 1.5rem; position: relative; font-size: .95rem; }
.feature-card__body li::before {
  content: "";
  position: absolute; left: 0; top: .62em;
  width: .7rem; height: .35rem;
  border-left: 2px solid var(--green);
  border-bottom: 2px solid var(--green);
  transform: rotate(-45deg);
}

/* ---------- Secondary products band ---------- */
.band-green {
  background: var(--green-deep);
  color: #fff;
}
.band-green h2, .band-green h3 { color: #fff; }
.band-green .eyebrow { color: var(--green-water); }
.band-green p { color: var(--white-dim); }
.prod-list {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 1.5rem;
  margin-top: 2.5rem;
}
@media (max-width: 760px) { .prod-list { grid-template-columns: 1fr; } }
.prod-list article {
  padding: 1.6rem;
  background: rgba(255, 255, 255, .08);
  border: 1px solid rgba(255, 255, 255, .16);
  border-radius: var(--radius-lg);
}
.prod-list h3 { font-size: 1.15rem; margin-bottom: .35rem; }
.prod-list p { margin: 0; font-size: .95rem; }

/* ---------- Gallery ---------- */
.gallery {
  display: grid;
  grid-template-columns: repeat(4, 1fr);
  gap: 1rem;
  margin-top: 2.5rem;
}
@media (max-width: 900px) { .gallery { grid-template-columns: repeat(2, 1fr); } }
.gallery figure {
  margin: 0;
  border-radius: var(--radius-lg);
  overflow: hidden;
  background: var(--bg-soft);
  border: 1px solid var(--line);
}
.gallery img {
  width: 100%;
  aspect-ratio: 3 / 4;
  object-fit: cover;
  transition: transform .4s var(--ease);
}
.gallery figure:hover img { transform: scale(1.04); }
.gallery figcaption {
  padding: .7rem .8rem .85rem;
  font-size: .8rem;
  color: #6a6f6b;
  line-height: 1.4;
}
.gallery figcaption strong { display: block; color: var(--ink); font-weight: 600; }

/* ---------- Contact ---------- */
.contact {
  background: var(--green-deep);
  color: #fff;
}
.contact h2 { color: #fff; }
.contact .eyebrow { color: var(--green-water); }
.contact__lead { color: var(--white-dim); max-width: 42ch; font-size: 1.075rem; }
.contact__grid {
  display: grid;
  grid-template-columns: .8fr 1.2fr;
  gap: clamp(2rem, 5vw, 4rem);
  align-items: start;
  margin-top: 1rem;
}
@media (max-width: 880px) { .contact__grid { grid-template-columns: 1fr; } }
.contact__email {
  display: inline-flex;
  align-items: center;
  gap: .6rem;
  font-size: clamp(1.15rem, 1rem + 1vw, 1.6rem);
  font-weight: 700;
  color: #fff;
  text-decoration: none;
  border-bottom: 2px solid rgba(255, 255, 255, .4);
  padding-bottom: .2rem;
  letter-spacing: -0.01em;
}
.contact__email:hover { border-color: #fff; }
.contact__meta { margin-top: 1.5rem; font-size: .9rem; color: var(--white-dim); }
.contact__meta a { color: #fff; }

.form-card {
  background: #fff;
  border-radius: var(--radius-lg);
  padding: clamp(1rem, .5rem + 2vw, 1.75rem);
  box-shadow: var(--shadow-md);
}
.form-card iframe {
  width: 100%;
  border: 0;
  min-height: 480px;
  display: block;
}
.form-card__fallback {
  margin: .75rem .25rem 0;
  font-size: .85rem;
  color: var(--body);
}

/* ---------- Footer ---------- */
.site-footer {
  background: var(--ink);
  color: #c9cdc9;
  padding-block: clamp(2.75rem, 1.5rem + 4vw, 4rem);
  font-size: .92rem;
}
.site-footer__top {
  display: flex;
  flex-wrap: wrap;
  justify-content: space-between;
  gap: 2rem;
  padding-bottom: 2rem;
  border-bottom: 1px solid rgba(255, 255, 255, .12);
}
.site-footer__brand { display: flex; align-items: center; gap: .8rem; }
.site-footer__brand img { width: 40px; height: 40px; }
.site-footer__brand strong { color: #fff; font-size: 1.05rem; display: block; }
.site-footer__brand span { font-size: .85rem; color: #9aa09a; }
.site-footer a { color: #fff; }
.site-footer__links { display: flex; gap: 1.5rem; flex-wrap: wrap; align-items: center; }
.site-footer__links a { text-decoration: none; font-weight: 600; }
.site-footer__links a:hover { text-decoration: underline; }
.site-footer__bottom {
  padding-top: 1.5rem;
  display: flex;
  flex-wrap: wrap;
  gap: .35rem 1.5rem;
  justify-content: space-between;
  color: #9aa09a;
  font-size: .82rem;
}
.site-footer__credits { max-width: 70ch; }

/* ---------- Reveal on scroll ---------- */
.reveal { opacity: 0; transform: translateY(18px); transition: opacity .6s var(--ease), transform .6s var(--ease); }
.reveal.is-visible { opacity: 1; transform: none; }
@media (prefers-reduced-motion: reduce) { .reveal { opacity: 1; transform: none; } }