/* ==========================================================================
   NEXDIA – Landing page
   Riferimento desktop: _design/NEXDIA Landing Page.png (1680px @2x).
   Le misure fluide raggiungono il valore del PNG da 1440px in su.
   ========================================================================== */

:root {
  /* Palette */
  --c-ink: #1E1E1C;      /* sfondi scuri, testo principale */
  --c-orange: #FF921E;   /* accenti, titoli secondari, CTA */
  --c-grey: #A8A8A2;     /* bordi, decorazione footer */
  --c-light: #E9E9E9;    /* sfondo sezione, decorazioni */
  --c-white: #FFFFFF;    /* sfondi chiari, testo su scuro */

  /* Font */
  --f-display: "Science Gothic", "Arial Black", sans-serif;
  --f-body: "Open Sans", Arial, sans-serif;

  /* Layout */
  --container: 1320px;
  --gutter: clamp(20px, 4.5vw, 60px);

  /* Scala tipografica (min @390px → max @1440px) */
  --fs-lead: clamp(1.875rem, 1.318rem + 2.286vw, 3.375rem);        /* 30 → 54 */
  --fs-hero-cta: clamp(1.875rem, 1.132rem + 3.048vw, 3.875rem);    /* 30 → 62 */
  --fs-statement: clamp(1.25rem, 0.971rem + 1.143vw, 2rem);        /* 20 → 32 */
  --fs-large: clamp(1.25rem, 1.064rem + 0.762vw, 1.75rem);         /* 20 → 28 */
  --fs-body: clamp(1.0625rem, 0.9rem + 0.667vw, 1.5rem);            /* 17 → 24 */
  --fs-small: clamp(0.8125rem, 0.766rem + 0.19vw, 0.9375rem);      /* 13 → 15 */

  /* Spaziature */
  --section-y: clamp(64px, 6.2vw + 40px, 110px);
  --panel-pad: clamp(20px, 1.9vw + 13px, 40px);

  --ease: cubic-bezier(.4, 0, .2, 1);
  --hero-ratio: 16 / 9;
  --hero-ratio-mobile: 9 / 16;
}

/* Reset essenziale
   ========================================================================== */
*, *::before, *::after { box-sizing: border-box; }
html { -webkit-text-size-adjust: 100%; text-size-adjust: 100%; }
body {
  margin: 0;
  background: var(--c-ink);
  color: var(--c-ink);
  font-family: var(--f-body);
  font-weight: 400;
  font-size: var(--fs-body);
  line-height: 1.42;
  letter-spacing: -0.005em;
  -webkit-font-smoothing: antialiased;
  -moz-osx-font-smoothing: grayscale;
  overflow-x: clip;
}
h1, h2, h3, h4, p, ul { margin: 0; }
ul { padding: 0; list-style: none; }
img { display: block; max-width: 100%; height: auto; }
strong { font-weight: 700; }
a { color: inherit; }
button { font: inherit; color: inherit; }

.visually-hidden {
  position: absolute !important;
  width: 1px; height: 1px;
  margin: -1px; padding: 0;
  overflow: hidden;
  clip: rect(0 0 0 0);
  clip-path: inset(50%);
  white-space: nowrap;
  border: 0;
}

.container {
  width: min(100% - 2 * var(--gutter), var(--container));
  margin-inline: auto;
}

:focus-visible {
  outline: 3px solid var(--c-orange);
  outline-offset: 4px;
}

/* Elementi comuni
   ========================================================================== */
.rule {
  display: block;
  width: 120px;
  height: 6px;
  background: var(--c-orange);
}

.statement {
  font-family: var(--f-display);
  font-weight: 500;
  font-size: var(--fs-statement);
  line-height: 1.25;
  letter-spacing: -0.005em;
}

/* Hero (animazione Lottie)
   ========================================================================== */
.hero {
  position: relative;
  background: var(--c-ink);
}
.hero__anim {
  width: 100%;
  aspect-ratio: var(--hero-ratio);
  overflow: hidden;
}
.hero__anim svg { display: block; }
@media (max-width: 640px) {
  .hero__anim { aspect-ratio: var(--hero-ratio-mobile); }
}

/* Sezione "approccio" + accordion
   ========================================================================== */
.approach {
  /* larghezza della decorazione (630px nel PNG); il testo di apertura non deve toccare la freccia */
  --deco-w: clamp(170px, 60vw - 234px, 630px);
  position: relative;
  isolation: isolate;
  padding-block: clamp(56px, 4.6vw + 38px, 104px) clamp(64px, 3.4vw + 51px, 100px);
  background:
    url("../assets/img/nexdia-top-background-insieme.svg") right top / var(--deco-w) auto no-repeat,
    var(--c-light);
}

.approach__lead {
  max-width: min(13.4em, 100vw - var(--deco-w) - var(--gutter) - 16px);
  font-size: var(--fs-lead);
  font-weight: 400;
  line-height: 1.222;
}

.approach > .container > .rule {
  margin-top: clamp(28px, 1.5vw + 22px, 44px);
}

.approach__row {
  display: grid;
  /* testo e frase in due colonne uguali: con il copy attuale 4 + 3 righe da 1440px in su */
  grid-template-columns: 120px minmax(0, 1fr) minmax(0, 1fr);
  column-gap: 50px;
  align-items: start;
  margin-top: 40px;
}
.approach__mark { width: 120px; }
.approach__text {
  font-size: var(--fs-large);
  line-height: 1.2857;
  padding-top: 1px;
}
.approach__statement {
  padding-top: 4px;
}

/* Accordion */
.accordion {
  display: grid;
  gap: 20px;
  margin-top: clamp(56px, 4.4vw + 38px, 102px);
}
.accordion__item { background: var(--c-white); }
.accordion__heading { font: inherit; }

.accordion__trigger {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 24px;
  width: 100%;
  min-height: clamp(88px, 3vw + 76px, 120px);
  padding: 21px var(--panel-pad) 19px;
  border: 0;
  border-radius: 0;
  background: var(--c-ink);
  color: var(--c-white);
  text-align: left;
  cursor: pointer;
}
.accordion__trigger:focus-visible {
  outline-offset: -3px;
  outline-color: var(--c-orange);
  box-shadow: inset 0 0 0 6px var(--c-ink), inset 0 0 0 7px var(--c-white);
}
.accordion__label { display: grid; }
.accordion__title {
  color: var(--c-orange);
  font-family: var(--f-display);
  font-weight: 500;
  font-size: var(--fs-statement);
  line-height: 1.25;
  letter-spacing: -0.005em;
}
.accordion__subtitle {
  margin-top: 4px;
  font-size: var(--fs-body);
  line-height: 1.42;
}

/* Icona di stato disegnata in CSS: "–" aperto, "+" chiuso */
.accordion__icon {
  position: relative;
  flex: none;
  width: clamp(44px, 1.5vw + 38px, 60px);
  aspect-ratio: 1;
  background: var(--c-orange);
  transition: background-color .2s var(--ease);
}
.accordion__icon::before,
.accordion__icon::after {
  content: "";
  position: absolute;
  top: 50%; left: 50%;
  width: 46.67%;
  height: 4px;
  background: var(--c-white);
  translate: -50% -50%;
  transition: rotate .35s var(--ease), background-color .2s var(--ease);
}
.accordion__icon::after { rotate: 90deg; }
.accordion__trigger[aria-expanded="true"] .accordion__icon::after { rotate: 0deg; }
.accordion__trigger:hover .accordion__icon { background: var(--c-white); }
.accordion__trigger:hover .accordion__icon::before,
.accordion__trigger:hover .accordion__icon::after { background: var(--c-orange); }

/* Pannello: altezza animata con grid-template-rows (0fr ↔ 1fr).
   Senza JS i pannelli restano aperti. */
.accordion__panel {
  display: grid;
  grid-template-rows: 1fr;
  transition: grid-template-rows .45s var(--ease), visibility 0s linear 0s;
}
.accordion__inner {
  min-height: 0;
  overflow: hidden;
}
.js .accordion__panel.is-collapsed {
  grid-template-rows: 0fr;
  visibility: hidden;
  transition: grid-template-rows .45s var(--ease), visibility 0s linear .45s;
}

.accordion__body {
  display: grid;
  padding: var(--panel-pad) var(--panel-pad) calc(var(--panel-pad) - 2px);
}

.point {
  display: grid;
  grid-template-columns: 31px 1fr;
  column-gap: 19px;
  align-items: start;
  font-size: var(--fs-large);
  font-weight: 700;
  line-height: 1.2857;
  /* Nel PNG questo testo è Open Sans SemiBold (600), non previsto dai pesi richiesti:
     con il 700 si stringe leggermente la spaziatura per mantenere gli stessi a capo. */
  letter-spacing: -0.02em;
}
.point__arrow {
  width: 31px;
  margin-top: calc((1.2857em - 38px) / 2);
}
.rule--indent {
  margin: 20px 0 0 50px;
}
.accordion__text {
  margin: 30px 0 0 50px;
  line-height: 1.4375;
}

/* paragrafi consecutivi nello stesso pannello */
.accordion__text + .accordion__text { margin-top: 19px; }

/* Sezione "punto di vista"
   ========================================================================== */
.viewpoint {
  position: relative;
  isolation: isolate;
  padding-block: calc(var(--section-y) - 7px) calc(var(--section-y) - 6px);
  background:
    url("../assets/img/nexdia-arrow-bottom.svg") left top / auto 100% no-repeat,
    var(--c-white);
}
.viewpoint__grid {
  display: grid;
  grid-template-columns: 520px minmax(0, 1fr);
  align-items: start;
}
.viewpoint__title { font: inherit; }
.viewpoint__kicker {
  display: block;
  padding-top: 2px;
  font-size: var(--fs-large);
  font-weight: 700;
  line-height: 1.2857;
}
.viewpoint__logo {
  width: 422.5px;
  margin-top: 20px;
}
.viewpoint__content {
  max-width: 800px;
  line-height: 1.4167;
}
.viewpoint__content > p + p { margin-top: 19px; }
.viewpoint__content > .viewpoint__statement {
  max-width: 740px;
  margin-top: 22px;
  line-height: 1.25;
}

/* Footer + CTA
   ========================================================================== */
.footer {
  position: relative;
  isolation: isolate;
  color: var(--c-white);
  background:
    url("../assets/img/nexdia-footer-background.svg") right bottom / clamp(220px, 35.7vw, 600px) auto no-repeat,
    var(--c-ink);
  padding-top: clamp(80px, 9.4vw + 43px, 189px);
  padding-bottom: 25px;
}
.cta__title {
  font-family: var(--f-display);
  font-weight: 500;
  font-size: var(--fs-hero-cta);
  line-height: 1.194;
  letter-spacing: -0.005em;
}
.cta__title > span { display: block; }
.cta__accent { color: var(--c-orange); }

.button {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  min-width: clamp(240px, 5.7vw + 218px, 300px);
  min-height: clamp(56px, 1.33vw + 51px, 70px);
  margin-top: clamp(32px, 1.5vw + 25px, 48px);
  padding: 12px 32px;
  background: var(--c-orange);
  color: var(--c-white);
  font-size: var(--fs-large);
  font-weight: 700;
  line-height: 1.2;
  text-decoration: none;
  transition: background-color .2s var(--ease), color .2s var(--ease), transform .1s var(--ease);
}
.button:hover {
  background: var(--c-white);
  color: var(--c-ink);
}
.button:focus-visible {
  outline: 3px solid var(--c-white);
  outline-offset: 4px;
}
.button:active {
  background: var(--c-light);
  color: var(--c-ink);
  transform: translateY(1px);
}

.legal {
  margin-top: clamp(96px, 7.5vw + 67px, 175px);
  font-size: var(--fs-small);
  line-height: 2;
}

/* Tablet
   ========================================================================== */
@media (max-width: 1100px) {
  /* tablet e mobile: icona +/– allineata in alto nella barra dell'accordion */
  .accordion__trigger { align-items: flex-start; }

  .approach__row {
    grid-template-columns: 120px minmax(0, 1fr);
    row-gap: 48px;
  }
  .approach__statement {
    grid-column: 1 / -1;
    justify-self: start;
    width: auto;
    max-width: 30ch;
  }
  .viewpoint__grid {
    grid-template-columns: minmax(0, 1fr);
    row-gap: 40px;
  }
}

/* Mobile
   ========================================================================== */
@media (max-width: 640px) {
  /* il testo parte sotto la freccia arancione della decorazione (bordo inferiore a ~0.4 × larghezza) */
  .approach { padding-top: calc(var(--deco-w) * 0.4 + 24px); }
  .approach__lead { max-width: none; }

  .accordion__trigger { gap: 16px; padding-inline: 20px; }
  .accordion__icon { width: 40px; }

  .approach__row {
    grid-template-columns: minmax(0, 1fr);
    row-gap: 24px;
    margin-top: 32px;
  }
  .approach__mark { width: 72px; }
  .approach__text { padding-top: 0; }

  .point { column-gap: 14px; grid-template-columns: 24px 1fr; }
  .point__arrow { width: 24px; margin-top: calc((1.2857em - 29px) / 2); }
  .rule--indent { margin-left: 38px; width: 90px; }
  .accordion__text { margin-left: 38px; margin-top: 24px; }

  .viewpoint { background-size: auto min(100%, 420px); }
  .viewpoint__logo { width: min(100%, 300px); margin-top: 12px; }

  /* Su mobile la freccia decorativa sta sopra al copyright: lo sfondo passa dal footer al blocco .legal,
     che si estende fino al bordo destro del viewport per mantenere la freccia a filo. */
  .footer { background: var(--c-ink); }
  .legal {
    --deco-w: clamp(220px, 35.7vw, 600px);
    margin-top: 56px;
    margin-right: calc(-1 * var(--gutter));
    padding-right: var(--gutter);
    padding-top: calc(var(--deco-w) * 2 / 3 + 24px);
    background: url("../assets/img/nexdia-footer-background.svg") right top / var(--deco-w) auto no-repeat;
  }
}

/* Riduzione del movimento
   ========================================================================== */
@media (prefers-reduced-motion: reduce) {
  *, *::before, *::after {
    transition-duration: 0s !important;
    transition-delay: 0s !important;
    animation-duration: 0s !important;
  }
}