/* =========================================================
   D.L.F. Costruzioni — Homepage dimostrativa
   Palette ricavata dal logo, tipografia Archivo + Source Serif 4
   ========================================================= */


:root {
  /* Colore */
  --white: #ffffff;
  --concrete: #e9ebec;      /* grigio calcestruzzo, freddo */
  --concrete-2: #d9dde0;
  --steel: #6e7881;         /* grigio acciaio, testi secondari */
  --steel-light: #a7b0b8;
  --antracite: #1d2228;
  --antracite-2: #262c33;
  --blue: #3a70a5;          /* blu del logo */
  --blue-deep: #1d446b;
  --blue-pale: #a9c4de;
  --line: rgba(29, 34, 40, .14);
  --line-dark: rgba(233, 235, 236, .16);

  /* Tipografia */
  --sans: "Archivo", "Helvetica Neue", Arial, sans-serif;
  --serif: "Source Serif 4", Georgia, "Times New Roman", serif;

  /* Misure */
  --gutter: clamp(20px, 5vw, 84px);
  --gap: clamp(16px, 2vw, 32px);
  --hh: 96px;               /* altezza header */
  --frame: clamp(10px, 1.4vw, 22px);
  --section: clamp(5.5rem, 11vw, 11.5rem);
  --radius: 2px;

  /* Movimento */
  --ease-out: cubic-bezier(.16, 1, .3, 1);
  --ease-inout: cubic-bezier(.7, 0, .2, 1);
}

@media (max-width: 900px) {
  :root { --hh: 72px; }
}

/* ---------- Reset essenziale ---------- */
*, *::before, *::after { box-sizing: border-box; }
html { -webkit-text-size-adjust: 100%; scroll-behavior: smooth; scroll-padding-top: 71px; }
body {
  margin: 0;
  background: var(--white);
  color: var(--antracite);
  font-family: var(--sans);
  font-size: clamp(1rem, .95rem + .2vw, 1.0625rem);
  line-height: 1.6;
  font-stretch: 100%;
  font-weight: 400;
  -webkit-font-smoothing: antialiased;
  text-rendering: optimizeLegibility;
  overflow-x: hidden;
  overflow-x: clip;
}
html { overflow-x: clip; }
img { display: block; max-width: 100%; height: auto; }
figure { margin: 0; }
h1, h2, h3, h4, p, ul, ol, dl, dd { margin: 0; }
ul, ol { padding: 0; list-style: none; }
a { color: inherit; text-decoration: none; }
button { font: inherit; color: inherit; background: none; border: 0; padding: 0; cursor: pointer; }
::selection { background: var(--blue); color: var(--white); }

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

.skip {
  position: absolute; left: 1rem; top: -4rem; z-index: 100;
  background: var(--antracite); color: var(--white);
  padding: .75rem 1rem; border-radius: var(--radius);
  transition: top .2s;
}
.skip:focus { top: 1rem; }

.wrap {
  width: 100%;
  max-width: 1680px;
  margin-inline: auto;
  padding-inline: var(--gutter);
}

/* ---------- Elementi tipografici condivisi ---------- */
.section-label {
  display: flex;
  align-items: center;
  gap: .9rem;
  font-size: .875rem;
  font-weight: 600;
  font-stretch: 100%;
  letter-spacing: .01em;
  color: var(--blue);
}
.section-label::before {
  content: "";
  width: 2.75rem;
  height: 1px;
  background: currentColor;
}
.section-label--dark { color: var(--blue-pale); }
.section-label--blue { color: var(--blue-pale); }

.display {
  font-size: clamp(2.5rem, 1.4rem + 4.4vw, 6rem);
  font-weight: 480;
  font-stretch: 108%;
  line-height: .98;
  letter-spacing: -.035em;
  text-wrap: balance;
}
.display--xl {
  font-size: clamp(2.9rem, 1.2rem + 6.8vw, 9.25rem);
  font-stretch: 112%;
  line-height: .93;
  letter-spacing: -.045em;
}

.statement {
  font-family: var(--serif);
  font-size: clamp(1.65rem, 1rem + 2.6vw, 3.5rem);
  font-weight: 360;
  line-height: 1.16;
  letter-spacing: -.012em;
  font-optical-sizing: auto;
  text-wrap: pretty;
}

/* =========================================================
   HEADER
   ========================================================= */
.site-header {
  position: fixed;
  inset: 0 0 auto 0;
  z-index: 50;
  height: var(--hh);
  background: var(--white);
  transition: height .5s var(--ease-out), box-shadow .5s;
}
.site-header.is-scrolled {
  --hh-s: 72px;
  height: var(--hh-s);
  box-shadow: 0 1px 0 var(--line);
}
.site-header__inner {
  height: 100%;
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 2rem;
  padding-inline: calc(var(--frame) + clamp(4px, 1.6vw, 28px));
}
.brand { display: block; flex: none; }
.brand img {
  height: 68px;
  width: auto;
  transition: height .5s var(--ease-out);
}
.site-header.is-scrolled .brand img { height: 52px; }

.nav__list {
  display: flex;
  align-items: center;
  gap: clamp(1.5rem, 2.8vw, 3.25rem);
  font-size: .95rem;
  font-weight: 500;
  font-stretch: 104%;
}
.nav__list a:not(.nav__cta) {
  position: relative;
  padding-block: .4rem;
}
.nav__list a:not(.nav__cta)::after {
  content: "";
  position: absolute; left: 0; right: 0; bottom: 0;
  height: 1px;
  background: var(--blue);
  transform: scaleX(0);
  transform-origin: right;
  transition: transform .5s var(--ease-out);
}
.nav__list a:not(.nav__cta):hover::after,
.nav__list a[aria-current="true"]::after {
  transform: scaleX(1);
  transform-origin: left;
}
.nav__cta {
  display: inline-block;
  padding: .7rem 1.35rem;
  border: 1px solid var(--antracite);
  border-radius: var(--radius);
  transition: background .35s, color .35s, border-color .35s;
}
.nav__cta:hover { background: var(--antracite); color: var(--white); }

.menu-toggle {
  display: none;
  align-items: center;
  gap: .8rem;
  font-size: .9rem;
  font-weight: 500;
  padding: .6rem 0 .6rem .6rem;
}
.menu-toggle__bars { position: relative; width: 26px; height: 10px; }
.menu-toggle__bars i {
  position: absolute; left: 0; right: 0; height: 1.5px;
  background: var(--antracite);
  transition: transform .45s var(--ease-out), top .45s var(--ease-out);
}
.menu-toggle__bars i:first-child { top: 0; }
.menu-toggle__bars i:last-child { top: 8.5px; }
.menu-toggle[aria-expanded="true"] .menu-toggle__bars i:first-child { top: 4.25px; transform: rotate(45deg); }
.menu-toggle[aria-expanded="true"] .menu-toggle__bars i:last-child { top: 4.25px; transform: rotate(-45deg); }

.menu-mobile {
  position: fixed;
  inset: var(--hh) 0 0 0;
  background: var(--white);
  padding: 2.5rem var(--gutter) 2rem;
  display: flex;
  flex-direction: column;
  justify-content: space-between;
  border-top: 1px solid var(--line);
}
.menu-mobile[hidden] { display: none; }
.menu-mobile ul li { border-bottom: 1px solid var(--line); overflow: hidden; }
.menu-mobile ul a {
  display: block;
  padding: 1.1rem 0;
  font-size: clamp(2rem, 9vw, 3rem);
  font-weight: 480;
  font-stretch: 110%;
  letter-spacing: -.03em;
  line-height: 1.05;
}
.menu-mobile__mail { font-size: 1rem; color: var(--blue); }

.js .menu-mobile ul a { transform: translateY(100%); transition: transform .7s var(--ease-out); }
.js .menu-mobile.is-open ul a { transform: none; }
.js .menu-mobile.is-open li:nth-child(2) a { transition-delay: .05s; }
.js .menu-mobile.is-open li:nth-child(3) a { transition-delay: .1s; }
.js .menu-mobile.is-open li:nth-child(4) a { transition-delay: .15s; }

@media (max-width: 900px) {
  .nav { display: none; }
  .menu-toggle { display: inline-flex; }
  .brand img { height: 50px; }
  .site-header.is-scrolled { height: var(--hh); }
  .site-header.is-scrolled .brand img { height: 46px; }
}

/* =========================================================
   1. HERO
   ========================================================= */
.hero {
  position: relative;
  height: 100vh;
  height: 100svh;
  min-height: 620px;
  padding: var(--hh) var(--frame) var(--frame);
  background: var(--white);
}
.hero__frame {
  position: relative;
  height: 100%;
  overflow: hidden;
  border-radius: var(--radius);
  background: var(--antracite);
  color: var(--white);
  isolation: isolate;
}
.hero__media,
.hero__media img {
  position: absolute;
  inset: 0;
  width: 100%;
  height: 100%;
}
.hero__media img {
  object-fit: cover;
  object-position: 50% 55%;
  transform: translate3d(0, var(--hero-y, 0px), 0) scale(var(--hero-s, 1.04));
  will-change: transform;
}
/* Trattamento cromatico: velatura blu del logo + ombra per la leggibilità */
.hero__shade {
  position: absolute; inset: 0;
  background:
    linear-gradient(to top, rgba(14, 20, 27, .86) 0%, rgba(14, 20, 27, .5) 26%, rgba(14, 20, 27, 0) 55%, rgba(14, 20, 27, .22) 100%),
    linear-gradient(to right, rgba(14, 20, 27, .45) 0%, rgba(14, 20, 27, 0) 55%);
}
.hero__shade::before {
  content: "";
  position: absolute; inset: 0;
  background: var(--blue-deep);
  mix-blend-mode: multiply;
  opacity: .3;
}

.hero__content {
  position: absolute;
  left: 0; right: 0; bottom: 0;
  padding: 0 clamp(20px, 4.2vw, 72px) clamp(28px, 4.6vw, 72px);
  display: grid;
  grid-template-columns: repeat(12, 1fr);
  column-gap: var(--gap);
  align-items: end;
}
.hero__title {
  grid-column: 1 / span 9;
  font-size: clamp(3rem, .5rem + 6.6vw, 8.75rem);
  font-weight: 500;
  font-stretch: 112%;
  line-height: .9;
  letter-spacing: -.048em;
}
.hero__title .line { display: block; white-space: nowrap; overflow: hidden; padding-bottom: .08em; margin-bottom: -.08em; }
.hero__title .line > span { display: inline-block; }

.hero__aside {
  grid-column: 10 / -1;
  display: flex;
  flex-direction: column;
  gap: 2.25rem;
  padding-bottom: .6rem;
}
.hero__lead {
  font-size: clamp(1rem, .9rem + .3vw, 1.2rem);
  line-height: 1.5;
  color: rgba(255, 255, 255, .86);
  max-width: 34ch;
}
.hero__scroll {
  display: inline-flex;
  align-items: center;
  gap: 1rem;
  font-size: .875rem;
  font-weight: 500;
  color: var(--white);
  width: max-content;
  white-space: nowrap;
}
.hero__scroll-track {
  position: relative;
  width: 1px;
  height: 52px;
  background: rgba(255, 255, 255, .28);
  overflow: hidden;
}
.hero__scroll-track span {
  position: absolute; left: 0; top: 0;
  width: 100%; height: 40%;
  background: var(--white);
  animation: scrollcue 2.4s var(--ease-inout) infinite;
}
@keyframes scrollcue {
  0%   { transform: translateY(-100%); }
  60%  { transform: translateY(260%); }
  100% { transform: translateY(260%); }
}
.hero__caption {
  position: absolute;
  top: clamp(18px, 2.4vw, 36px);
  right: clamp(20px, 4.2vw, 72px);
  font-size: .8125rem;
  color: rgba(255, 255, 255, .72);
  display: flex; align-items: center; gap: .6rem;
}
.hero__caption::before {
  content: "";
  width: 7px; height: 7px;
  background: var(--blue-pale);
}

/* Sequenza d'ingresso: un unico momento orchestrato */
.js .hero__frame { clip-path: inset(9% 5% 9% 5% round var(--radius)); }
.js .hero__media img { --hero-s: 1.16; }
.js .hero__title .line > span { transform: translateY(108%); }
.js .hero__aside,
.js .hero__caption { opacity: 0; transform: translateY(14px); }
.js .site-header { opacity: 0; }

.js.is-loaded .hero__frame {
  clip-path: inset(0 0 0 0 round var(--radius));
  transition: clip-path 1.6s var(--ease-inout);
}
.js.is-loaded .hero__media img {
  --hero-s: 1.04;
  transition: transform 2.4s var(--ease-out);
}
.js.is-loaded .hero__media img.is-settled { transition: none; }
.js.is-loaded .hero__title .line > span {
  transform: none;
  transition: transform 1.3s var(--ease-out);
  transition-delay: .9s;
}
.js.is-loaded .hero__title .line:nth-child(2) > span { transition-delay: 1.02s; }
.js.is-loaded .hero__aside,
.js.is-loaded .hero__caption {
  opacity: 1; transform: none;
  transition: opacity 1s ease, transform 1s var(--ease-out);
  transition-delay: 1.35s;
}
.js.is-loaded .site-header { opacity: 1; transition: opacity .9s ease .2s, height .5s var(--ease-out), box-shadow .5s; }

@media (max-width: 1100px) {
  .hero__title { grid-column: 1 / -1; font-size: clamp(3rem, 1rem + 8vw, 7rem); }
  .hero__aside { grid-column: 1 / span 7; margin-top: 2rem; flex-direction: row; align-items: flex-end; justify-content: space-between; }
}
@media (max-width: 700px) {
  .hero { min-height: 560px; }
  .hero__media img { object-position: 50% 50%; }
  .hero__title { font-size: clamp(2.7rem, 12.5vw, 4.25rem); letter-spacing: -.04em; }
  .hero__title .line { white-space: normal; }
  .hero__aside { grid-column: 1 / -1; flex-direction: column; align-items: flex-start; gap: 1.5rem; margin-top: 1.4rem; }
  .hero__caption { left: clamp(20px, 4.2vw, 72px); right: auto; font-size: .75rem; }
  .hero__scroll-track { height: 40px; }
}

/* =========================================================
   2. IDENTITÀ
   ========================================================= */
.identity { padding-block: var(--section); }
.identity__head {
  display: grid;
  grid-template-columns: repeat(12, 1fr);
  column-gap: var(--gap);
  row-gap: 2rem;
  align-items: start;
}
.identity__head .section-label { grid-column: 1 / span 3; padding-top: 1.1em; }
.identity__head .statement { grid-column: 4 / -1; max-width: 30ch; }

.identity__body {
  margin-top: clamp(4rem, 9vw, 9rem);
  display: grid;
  grid-template-columns: repeat(12, 1fr);
  column-gap: var(--gap);
  align-items: start;
}
.identity__fig--main {
  grid-column: 5 / -1;
  grid-row: 1 / span 2;
  margin-right: calc(var(--gutter) * -1);
  aspect-ratio: 16 / 10;
  overflow: hidden;
  border-radius: var(--radius) 0 0 var(--radius);
}
.identity__fig--main img { width: 100%; height: 100%; object-fit: cover; object-position: 60% 50%; }
.identity__text {
  grid-column: 1 / span 4;
  grid-row: 1;
  display: grid;
  gap: 1.25rem;
  color: var(--steel);
  max-width: 38ch;
  padding-top: .4rem;
}
.identity__text p:first-child { color: var(--antracite); font-size: 1.125rem; line-height: 1.55; }
.identity__fig--people {
  grid-column: 2 / span 4;
  grid-row: 2;
  margin-top: clamp(3rem, 7vw, 7rem);
  margin-bottom: calc(clamp(3rem, 8vw, 8rem) * -1);
  position: relative;
  z-index: 2;
}
.identity__fig--people img {
  width: 100%;
  aspect-ratio: 4 / 3;
  object-fit: cover;
  border-radius: var(--radius);
  border: clamp(8px, 1vw, 14px) solid var(--white);
  border-width: clamp(8px, 1vw, 14px) clamp(8px, 1vw, 14px) 0 0;
}
.identity__fig figcaption {
  margin-top: 1.1rem;
  font-size: .8125rem;
  color: var(--steel);
  max-width: 34ch;
}
.identity { padding-bottom: calc(var(--section) + clamp(3rem, 8vw, 8rem)); }

@media (max-width: 900px) {
  .identity__head .section-label,
  .identity__head .statement { grid-column: 1 / -1; padding-top: 0; }
  .identity__body { row-gap: 2.5rem; }
  .identity__text { grid-column: 1 / -1; grid-row: 1; max-width: 46ch; }
  .identity__fig--main { grid-column: 1 / -1; grid-row: 2; margin-right: calc(var(--gutter) * -1); }
  .identity__fig--people { grid-column: 3 / -1; grid-row: 3; margin-top: -4.5rem; margin-bottom: 0; }
  .identity__fig--people img { border-width: clamp(8px, 1vw, 14px) 0 0 clamp(8px, 1vw, 14px); }
  .identity { padding-bottom: var(--section); }
}

/* =========================================================
   3. COMPETENZE
   ========================================================= */
.skills {
  background: var(--concrete);
  padding-block: var(--section);
}
.skills__head {
  display: grid;
  grid-template-columns: repeat(12, 1fr);
  column-gap: var(--gap);
  row-gap: 2rem;
  align-items: end;
}
.skills__head .section-label { grid-column: 1 / -1; }
.skills__head .display { grid-column: 1 / span 8; max-width: 13ch; }
.skills__intro { grid-column: 9 / -1; color: var(--steel); max-width: 36ch; padding-bottom: .5rem; }

.skills__grid {
  margin-top: clamp(4rem, 8vw, 8rem);
  display: grid;
  grid-template-columns: repeat(12, 1fr);
  column-gap: var(--gap);
}
.skills__list { grid-column: 1 / span 5; grid-row: 1; }
.skills__stage { grid-column: 7 / -1; grid-row: 1; position: relative; }

.stage {
  position: sticky;
  top: calc(var(--hh) + 5vh);
  height: calc(100vh - var(--hh) - 10vh);
  min-height: 460px;
  max-height: 900px;
}
.stage__main {
  position: absolute;
  inset: 0 0 0 12%;
  overflow: hidden;
  border-radius: var(--radius);
  background: var(--concrete-2);
}
.stage__inset {
  position: absolute;
  left: 0;
  bottom: 9%;
  width: 34%;
  aspect-ratio: 3 / 4;
  overflow: hidden;
  border-radius: var(--radius);
  border: clamp(8px, 1vw, 14px) solid var(--concrete);
  background: var(--concrete-2);
  z-index: 3;
}
.stage__main img,
.stage__inset img {
  position: absolute; inset: 0;
  width: 100%; height: 100%;
  object-fit: cover;
  clip-path: inset(100% 0 0 0);
  transform: scale(1.12);
  z-index: 0;
  transition: clip-path 1.15s var(--ease-inout), transform 1.6s var(--ease-out);
}
.stage__inset img { transition-delay: .12s; }
/* collage impianti: si taglia a destra per lasciare visibili le foto di sinistra */
.stage__main img[data-skill="2"] { object-position: 0% 50%; }
.stage img.is-prev { clip-path: inset(0); transform: scale(1); z-index: 1; transition: none; }
.stage img.is-active { clip-path: inset(0); transform: scale(1); z-index: 2; }

.stage__progress {
  position: absolute;
  right: 0; bottom: -2rem;
  display: flex; gap: 6px;
}
.stage__progress i {
  width: 28px; height: 2px;
  background: rgba(29, 34, 40, .18);
  transition: background .5s, width .5s var(--ease-out);
}
.stage__progress i.is-active { background: var(--blue); width: 56px; }

.skill {
  min-height: calc(100vh - var(--hh));
  display: flex;
  flex-direction: column;
  justify-content: center;
  padding-block: 3rem;
}
.skill:first-child { min-height: calc(80vh - var(--hh)); justify-content: flex-start; padding-top: 12vh; }
.skill__media { display: none; }
.skill__title {
  font-size: clamp(2.2rem, 1.2rem + 3vw, 4.5rem);
  font-weight: 480;
  font-stretch: 110%;
  line-height: .98;
  letter-spacing: -.035em;
  margin-bottom: 1.5rem;
}
.skill > p { color: var(--steel); max-width: 40ch; }
.skill__items {
  margin-top: 2.25rem;
  border-top: 1px solid var(--line);
  max-width: 44ch;
}
.skill__items li {
  display: flex; align-items: center; gap: 1rem;
  padding: .85rem 0;
  border-bottom: 1px solid var(--line);
  font-size: .975rem;
  font-weight: 500;
}
.skill__items li::before {
  content: "";
  width: 6px; height: 6px; flex: none;
  background: var(--blue);
}

.js .skill { transition: opacity .6s ease; }
.js .skills__list.is-tracking .skill:not(.is-current) { opacity: .32; }

@media (max-width: 900px) {
  .skills__head .display,
  .skills__intro { grid-column: 1 / -1; }
  .skills__stage { display: none; }
  .skills__list { grid-column: 1 / -1; }
  .skill, .skill:first-child { min-height: 0; padding: 0 0 4.5rem; justify-content: flex-start; }
  .skill:last-child { padding-bottom: 0; }
  .skill__media {
    display: block;
    margin: 0 calc(var(--gutter) * -1) 2rem;
    aspect-ratio: 4 / 3;
    overflow: hidden;
  }
  .skill__media img { width: 100%; height: 100%; object-fit: cover; }
  .js .skills__list.is-tracking .skill:not(.is-current) { opacity: 1; }
}

/* =========================================================
   INTERMEZZO FOTOGRAFICO
   ========================================================= */
.interlude { position: relative; background: var(--antracite); }
.interlude__media {
  position: relative;
  height: clamp(380px, 82vh, 920px);
  overflow: hidden;
}
.interlude__media img {
  position: absolute;
  left: 0; top: -12%;
  width: 100%; height: 124%;
  object-fit: cover;
  transform: translate3d(0, var(--py, 0px), 0);
  will-change: transform;
}
.interlude__caption {
  position: absolute;
  left: 0; right: 0; bottom: 0;
  padding-block: 1.4rem;
  font-size: .8125rem;
  color: rgba(255, 255, 255, .8);
  display: flex; align-items: center; gap: .6rem;
  background: linear-gradient(to top, rgba(17, 22, 28, .6), transparent);
}
.interlude__caption::before { content: ""; width: 7px; height: 7px; background: var(--blue-pale); flex: none; }

/* =========================================================
   4. APPROCCIO
   ========================================================= */
.approach {
  position: relative;
  background: var(--antracite);
  color: var(--concrete);
  padding-block: var(--section);
  overflow: hidden;
  isolation: isolate;
}
.approach__bg {
  position: absolute;
  left: 0; right: 0; top: 0;
  height: min(120vh, 1100px);
  z-index: -1;
  -webkit-mask-image: linear-gradient(to bottom, #000 0%, rgba(0,0,0,.6) 45%, transparent 100%);
          mask-image: linear-gradient(to bottom, #000 0%, rgba(0,0,0,.6) 45%, transparent 100%);
}
.approach__bg img {
  width: 100%; height: 115%;
  object-fit: cover;
  filter: grayscale(1) contrast(1.1);
  opacity: .13;
  transform: translate3d(0, var(--py, 0px), 0);
}
.approach__head { display: grid; gap: 2.5rem; }
.approach__head .display { color: var(--white); max-width: 13ch; }

.principles {
  margin-top: clamp(4rem, 9vw, 9rem);
  display: grid;
  grid-template-columns: repeat(12, 1fr);
  column-gap: var(--gap);
  row-gap: 3rem;
}
.principles__intro {
  grid-column: 1 / span 4;
  font-size: clamp(1.1rem, 1rem + .4vw, 1.35rem);
  line-height: 1.5;
  color: var(--blue-pale);
  max-width: 30ch;
}
.principles__list {
  grid-column: 6 / -1;
  display: grid;
  grid-template-columns: 1fr 1fr;
  column-gap: var(--gap);
  row-gap: clamp(2.5rem, 4vw, 4rem);
}
.principle {
  border-top: 1px solid var(--line-dark);
  padding-top: 1.5rem;
}
.principle dt {
  font-family: var(--serif);
  font-size: clamp(1.7rem, 1.2rem + 1.4vw, 2.6rem);
  font-weight: 360;
  letter-spacing: -.01em;
  line-height: 1.1;
  color: var(--white);
  margin-bottom: .9rem;
}
.principle dd { color: var(--steel-light); max-width: 34ch; }

.process { margin-top: clamp(6rem, 12vw, 12rem); }
.process__title {
  font-size: clamp(1.4rem, 1.1rem + 1vw, 2rem);
  font-weight: 480;
  font-stretch: 108%;
  letter-spacing: -.02em;
  color: var(--white);
  padding-bottom: 1.5rem;
  border-bottom: 1px solid var(--line-dark);
}
.process__steps {
  margin-top: 3rem;
  display: grid;
  grid-template-columns: repeat(4, 1fr);
  column-gap: var(--gap);
  align-items: start;
}
.step:nth-child(2) { margin-top: clamp(2rem, 5vw, 5.5rem); }
.step:nth-child(3) { margin-top: clamp(4rem, 10vw, 11rem); }
.step:nth-child(4) { margin-top: clamp(6rem, 15vw, 16.5rem); }
.step__media {
  aspect-ratio: 3 / 4;
  overflow: hidden;
  border-radius: var(--radius);
  margin-bottom: 1.5rem;
}
.step__media img {
  width: 100%; height: 100%;
  object-fit: cover;
  filter: grayscale(.25) contrast(1.04);
  transition: transform 1.2s var(--ease-out), filter .8s;
}
.step:hover .step__media img { transform: scale(1.045); filter: none; }
.step__num {
  display: block;
  font-size: .875rem;
  font-weight: 500;
  font-stretch: 120%;
  color: var(--blue-pale);
  font-variant-numeric: tabular-nums;
  margin-bottom: .5rem;
}
.step h4 {
  font-size: 1.375rem;
  font-weight: 500;
  font-stretch: 106%;
  letter-spacing: -.015em;
  color: var(--white);
  margin-bottom: .6rem;
}
.step p { font-size: .95rem; color: var(--steel-light); max-width: 30ch; }

@media (max-width: 1000px) {
  .principles__intro, .principles__list { grid-column: 1 / -1; }
  .process__steps { grid-template-columns: 1fr 1fr; row-gap: 3.5rem; }
  .step:nth-child(n) { margin-top: 0; }
  .step:nth-child(even) { margin-top: 4rem; }
}
@media (max-width: 600px) {
  .principles__list { grid-template-columns: 1fr; }
  .process__steps { column-gap: 14px; }
  .step h4 { font-size: 1.15rem; }
  .step p { font-size: .9rem; }
}

/* =========================================================
   5. CERTIFICAZIONI
   ========================================================= */
.certs { background: var(--white); padding-block: var(--section); }
.certs__head {
  display: grid;
  grid-template-columns: repeat(12, 1fr);
  column-gap: var(--gap);
  row-gap: 2rem;
  align-items: end;
}
.certs__head .section-label { grid-column: 1 / -1; }
.certs__head .display { grid-column: 1 / span 8; max-width: 14ch; }
.certs__intro { grid-column: 9 / -1; color: var(--steel); max-width: 38ch; padding-bottom: .5rem; }

.register {
  margin-top: clamp(4rem, 8vw, 7rem);
  border-top: 1px solid var(--antracite);
}
.register__row {
  position: relative;
  display: grid;
  grid-template-columns: repeat(12, 1fr);
  column-gap: var(--gap);
  row-gap: 1rem;
  align-items: start;
  padding-block: clamp(1.75rem, 3vw, 2.5rem);
  border-bottom: 1px solid var(--line);
}
.register__row::before {
  content: "";
  position: absolute; left: 0; top: -1px;
  width: 100%; height: 2px;
  background: var(--blue);
  transform: scaleX(0);
  transform-origin: left;
  transition: transform .7s var(--ease-out);
}
.register__row:hover::before { transform: scaleX(1); }

.register__name { grid-column: 1 / span 4; }
.register__name h3 {
  font-size: clamp(1.75rem, 1.2rem + 1.7vw, 2.9rem);
  font-weight: 480;
  font-stretch: 108%;
  letter-spacing: -.03em;
  line-height: 1;
  transition: color .4s;
}
.register__row:hover .register__name h3 { color: var(--blue); }
.register__area {
  display: inline-flex; align-items: center; gap: .55rem;
  margin-top: .85rem;
  font-size: .875rem;
  font-weight: 600;
  color: var(--blue);
}
.register__area::before { content: ""; width: 6px; height: 6px; background: currentColor; }

.register__scope {
  grid-column: 5 / span 4;
  font-family: var(--serif);
  font-size: clamp(1.1rem, 1rem + .4vw, 1.35rem);
  font-weight: 360;
  line-height: 1.4;
  max-width: 36ch;
  padding-top: .35rem;
}
.register__meta {
  grid-column: 9 / span 2;
  display: grid;
  gap: .3rem;
  justify-items: start;
  font-size: .9rem;
  color: var(--steel);
  padding-top: .5rem;
}
.register__meta span:first-child { color: var(--antracite); font-weight: 500; }

/* Loghi degli enti in medaglioni circolari, sullo stile del badge EcoVadis */
.register__seal {
  grid-column: 11 / -1;
  justify-self: end;
  align-self: center;
  width: clamp(92px, 8.6vw, 124px);
  aspect-ratio: 1;
  border-radius: 50%;
  background: var(--white);
  border: 1px solid var(--concrete-2);
  box-shadow: inset 0 0 0 5px var(--white), inset 0 0 0 6px var(--concrete);
  display: grid;
  place-items: center;
  transition: border-color .4s, transform .6s var(--ease-out);
}
.register__seal img {
  width: 80%;
  height: 60%;
  object-fit: contain;
}
.register__seal--badge { border: 0; box-shadow: none; background: none; }
.register__seal--badge img { width: 100%; height: 100%; }
.register__row:hover .register__seal { border-color: var(--blue-pale); transform: rotate(-4deg); }

@media (max-width: 1000px) {
  .certs__head .display, .certs__intro { grid-column: 1 / -1; }
  .register__name { grid-column: 1 / span 9; grid-row: 1; }
  .register__seal { grid-column: 10 / -1; grid-row: 1 / span 2; align-self: start; }
  .register__scope { grid-column: 1 / span 6; grid-row: 2; }
  .register__meta { grid-column: 7 / span 3; grid-row: 2; }
}
@media (max-width: 640px) {
  .register__name { grid-column: 1 / span 8; }
  .register__seal { grid-column: 9 / -1; grid-row: 1; width: 76px; }
  .register__scope { grid-column: 1 / -1; grid-row: 2; }
  .register__meta { grid-column: 1 / -1; grid-row: 3; padding-top: 0; }
}

/* =========================================================
   6. CONTATTO
   ========================================================= */
.contact {
  background: var(--blue-deep);
  color: var(--white);
  padding-block: var(--section);
}
.contact .section-label { margin-bottom: 2.5rem; }
.contact__title { max-width: 15ch; }
.contact__row {
  margin-top: clamp(3.5rem, 7vw, 7rem);
  display: grid;
  grid-template-columns: repeat(12, 1fr);
  column-gap: var(--gap);
  row-gap: 1.5rem;
  align-items: end;
  padding-top: 2rem;
  border-top: 1px solid rgba(255, 255, 255, .2);
}
.contact__text { grid-column: 1 / span 5; color: var(--blue-pale); max-width: 34ch; font-size: clamp(1.05rem, 1rem + .3vw, 1.25rem); line-height: 1.5; }
.contact__row .button { grid-column: 8 / -1; justify-self: end; margin-top: 0; }

.contact__refs {
  margin-top: clamp(4rem, 8vw, 7rem);
  display: grid;
  grid-template-columns: repeat(12, 1fr);
  column-gap: var(--gap);
  row-gap: 2.5rem;
}
.contact__ref { padding-top: 1.25rem; border-top: 1px solid rgba(255, 255, 255, .2); }
.contact__ref:nth-child(1) { grid-column: 1 / span 4; }
.contact__ref:nth-child(2) { grid-column: 5 / span 2; }
.contact__ref:nth-child(3) { grid-column: 7 / span 2; }
.contact__ref:nth-child(4) { grid-column: 9 / -1; }
.contact__ref dt {
  font-size: .875rem;
  font-weight: 600;
  color: var(--blue-pale);
  margin-bottom: .75rem;
}
.contact__ref dd {
  font-family: var(--serif);
  font-size: clamp(1.2rem, 1rem + .7vw, 1.6rem);
  font-weight: 360;
  line-height: 1.35;
  letter-spacing: -.005em;
  overflow-wrap: anywhere;
}
.contact__ref strong { font-weight: 500; }
.contact__ref a {
  background: linear-gradient(currentColor, currentColor) 0 100% / 0% 1px no-repeat;
  transition: background-size .6s var(--ease-out);
}
.contact__ref a:hover { background-size: 100% 1px; }
.contact__ref a:focus-visible { outline-color: var(--white); }

.button {
  display: inline-flex;
  align-items: center;
  margin-top: clamp(2.5rem, 4vw, 3.5rem);
  padding: 1.05rem 1.9rem;
  background: var(--white);
  color: var(--blue-deep);
  font-weight: 600;
  font-size: .95rem;
  border: 1px solid var(--white);
  border-radius: var(--radius);
  transition: background .35s, color .35s;
}
.button:hover { background: transparent; color: var(--white); }
.contact .button:focus-visible { outline-color: var(--white); }

@media (max-width: 900px) {
  .contact__text, .contact__row .button { grid-column: 1 / -1; justify-self: start; }
  .contact__row .button { margin-top: 1rem; }
  .contact__ref:nth-child(n) { grid-column: span 6; }
}
@media (max-width: 560px) {
  .contact__ref:nth-child(n) { grid-column: 1 / -1; }
  .site-footer__base { flex-direction: column; }
}

/* =========================================================
   FOOTER
   ========================================================= */
.site-footer { background: var(--white); padding-top: clamp(4rem, 7vw, 6.5rem); }
.site-footer__inner {
  display: grid;
  grid-template-columns: repeat(12, 1fr);
  column-gap: var(--gap);
  row-gap: 2.5rem;
  align-items: start;
}
.site-footer__brand { grid-column: 1 / span 4; }
.site-footer__brand img { width: clamp(180px, 18vw, 260px); }
.site-footer__info {
  grid-column: 6 / span 4;
  display: grid; gap: 1rem;
  font-size: .95rem;
  color: var(--steel);
}
.site-footer__info strong { color: var(--antracite); font-weight: 600; }
.site-footer__info a { color: var(--blue); }
.site-footer__info a:hover { text-decoration: underline; text-underline-offset: 3px; }
.site-footer__nav {
  grid-column: 10 / -1;
  display: grid; gap: .55rem;
  font-size: .95rem; font-weight: 500;
  justify-items: start;
}
.site-footer__nav a:hover { color: var(--blue); }
.site-footer__base {
  margin-top: clamp(3rem, 6vw, 5rem);
  display: flex; justify-content: space-between; gap: 1rem;
  padding-block: 1.6rem;
  border-top: 1px solid var(--line);
  font-size: .8125rem;
  color: var(--steel);
}
.site-footer__links { display: flex; gap: 1.75rem; }
.site-footer__links a:hover { color: var(--antracite); }

@media (max-width: 900px) {
  .site-footer__brand { grid-column: 1 / -1; }
  .site-footer__info { grid-column: 1 / span 7; }
  .site-footer__nav { grid-column: 8 / -1; }
}
@media (max-width: 520px) {
  .site-footer__info, .site-footer__nav { grid-column: 1 / -1; }
}

/* =========================================================
   PAGINA PRIVACY
   ========================================================= */
.back-link {
  display: inline-block;
  padding: .7rem 1.35rem;
  border: 1px solid var(--antracite);
  border-radius: var(--radius);
  font-size: .95rem;
  font-weight: 500;
  transition: background .35s, color .35s;
}
.back-link:hover { background: var(--antracite); color: var(--white); }
@media (max-width: 520px) { .back-link { padding: .55rem .9rem; font-size: .875rem; } }

.legal { padding-top: calc(var(--hh) + clamp(4rem, 9vw, 8rem)); padding-bottom: var(--section); }
.legal__head {
  display: grid;
  grid-template-columns: repeat(12, 1fr);
  column-gap: var(--gap);
  row-gap: 2rem;
  padding-bottom: clamp(3rem, 6vw, 5rem);
  border-bottom: 1px solid var(--antracite);
}
.legal__head > * { grid-column: 1 / span 9; }
.legal__head .display { max-width: 18ch; }
.legal__intro { font-family: var(--serif); font-size: clamp(1.2rem, 1rem + .6vw, 1.55rem); font-weight: 360; line-height: 1.45; max-width: 46ch; }
.legal__date { font-size: .875rem; color: var(--steel); }

.legal__block {
  display: grid;
  grid-template-columns: repeat(12, 1fr);
  column-gap: var(--gap);
  padding-block: clamp(2rem, 4vw, 3.25rem);
  border-bottom: 1px solid var(--line);
}
.legal__block > * { grid-column: 5 / span 7; max-width: 66ch; }
.legal__block > h2 {
  grid-column: 1 / span 4;
  grid-row: 1 / span 20;
  align-self: start;
  display: flex; gap: 1rem; align-items: baseline;
  font-size: clamp(1.25rem, 1.05rem + .6vw, 1.6rem);
  font-weight: 500;
  font-stretch: 106%;
  letter-spacing: -.015em;
  line-height: 1.15;
  padding-right: 1rem;
}
.legal__block > h2 span {
  flex: none;
  font-size: .875rem;
  font-weight: 600;
  color: var(--blue);
  font-variant-numeric: tabular-nums;
  min-width: 1.25rem;
}
.legal__block h3 { font-size: 1rem; font-weight: 600; margin-top: 1.5rem; margin-bottom: .4rem; }
.legal__block h3:first-of-type { margin-top: 0; }
.legal__block p { color: #3b434b; }
.legal__block p + p { margin-top: 1rem; }
.legal__block a { color: var(--blue); text-decoration: underline; text-underline-offset: 3px; text-decoration-thickness: 1px; }
.legal__list li { position: relative; padding-left: 1.4rem; color: #3b434b; }
.legal__list li + li { margin-top: .9rem; }
.legal__list li::before { content: ""; position: absolute; left: 0; top: .62em; width: 6px; height: 6px; background: var(--blue); }

@media (max-width: 900px) {
  .legal__head > *, .legal__block > *, .legal__block > h2 { grid-column: 1 / -1; grid-row: auto; }
  .legal__block > h2 { margin-bottom: 1rem; }
}

/* =========================================================
   VIDEO DELLA REALIZZAZIONE (sezione Approccio)
   ========================================================= */
.film {
  margin-top: clamp(6rem, 12vw, 11rem);
  padding-top: clamp(2.5rem, 4vw, 3.5rem);
  border-top: 1px solid var(--line-dark);
  display: grid;
  grid-template-columns: repeat(12, 1fr);
  column-gap: var(--gap);
  row-gap: 2.5rem;
  align-items: end;
}
.film__text { grid-column: 1 / span 4; display: grid; gap: 1.25rem; justify-items: start; }
.film__title {
  font-size: clamp(1.6rem, 1.2rem + 1.3vw, 2.5rem);
  font-weight: 480;
  font-stretch: 108%;
  letter-spacing: -.025em;
  line-height: 1.05;
  color: var(--white);
  max-width: 14ch;
}
.film__text p { color: var(--steel-light); max-width: 34ch; }
.film__toggle {
  display: inline-flex; align-items: center; gap: .75rem;
  margin-top: .5rem;
  font-size: .875rem; font-weight: 500;
  color: var(--white);
}
.film__toggle-icon {
  position: relative;
  width: 40px; height: 40px; flex: none;
  border-radius: 50%;
  border: 1px solid rgba(255, 255, 255, .4);
  transition: background .3s, border-color .3s;
}
.film__toggle:hover .film__toggle-icon { background: rgba(255, 255, 255, .12); border-color: var(--white); }
.film__toggle:focus-visible { outline-color: var(--white); }
.film__toggle-icon::after {
  content: "";
  position: absolute; top: 50%; left: 50%;
  width: 10px; height: 12px;
  transform: translate(-50%, -50%);
  border-left: 3px solid var(--white);
  border-right: 3px solid var(--white);
}
.film__toggle[aria-pressed="true"] .film__toggle-icon::after {
  width: 0; height: 0;
  border-style: solid;
  border-width: 6px 0 6px 10px;
  border-color: transparent transparent transparent var(--white);
  transform: translate(-35%, -50%);
}

/* Riquadro contenuto: il video non supera la sua risoluzione nativa */
.film__media {
  grid-column: 6 / -1;
  justify-self: end;
  width: 100%;
  max-width: 860px;
  position: relative;
  aspect-ratio: 1280 / 630;
  overflow: hidden;
  border-radius: var(--radius);
  background: var(--antracite-2);
}
.film__video { width: 100%; height: 100%; object-fit: cover; display: block; }
.film__progress {
  position: absolute; left: 0; right: 0; bottom: 0;
  height: 2px;
  background: rgba(255, 255, 255, .16);
}
.film__progress span {
  display: block; height: 100%;
  background: var(--blue-pale);
  transform-origin: left;
  transform: scaleX(var(--p, 0));
}

@media (max-width: 1000px) {
  .film__text, .film__media { grid-column: 1 / -1; }
  .film__media { justify-self: start; }
}

/* =========================================================
   RIVELAZIONI ALLO SCROLL (solo con JS e movimento consentito)
   ========================================================= */
.js [data-reveal="image"] img {
  clip-path: inset(100% 0 0 0);
  transform: scale(1.14);
  transform-origin: 50% 100%;
}
.js [data-reveal="image"].is-in img {
  clip-path: inset(-40px);
  transform: none;
  transition: clip-path 1.3s var(--ease-inout), transform 1.8s var(--ease-out);
}

.js [data-reveal="lines"] .w { display: inline-block; overflow: hidden; vertical-align: top; padding-bottom: .1em; margin-bottom: -.1em; }
.js [data-reveal="lines"] .w > span { display: inline-block; transform: translateY(105%); }
.js [data-reveal="lines"].is-in .w > span {
  transform: none;
  transition: transform 1.1s var(--ease-out);
  transition-delay: calc(var(--i, 0) * 45ms);
}

.js [data-reveal="text"] .t { transition: color .4s ease; color: rgba(29, 34, 40, .2); }
.js [data-reveal="text"] .t.is-lit { color: var(--antracite); }

/* =========================================================
   MOVIMENTO RIDOTTO
   ========================================================= */
@media (prefers-reduced-motion: reduce) {
  html { scroll-behavior: auto; }
  *, *::before, *::after {
    animation-duration: .001ms !important;
    animation-iteration-count: 1 !important;
    transition-duration: .001ms !important;
    transition-delay: 0s !important;
  }
  .js .hero__frame { clip-path: none; }
  .js .hero__media img { --hero-s: 1; transform: none; }
  .js .hero__title .line > span,
  .js .hero__aside, .js .hero__caption,
  .js [data-reveal="lines"] .w > span { transform: none; opacity: 1; }
  .js .site-header { opacity: 1; }
  .js [data-reveal="image"] img { clip-path: none; transform: none; }
  .js [data-reveal="text"] .t { color: var(--antracite); }
  .hero__scroll-track span { animation: none; transform: translateY(70%); }
  .interlude__media img, .approach__bg img { transform: none; }
}