/* ==========================================================
   Mowi Sustainability Hub
   Pagina statica HTML/CSS responsive e accessibile.
   Palette: verde Mowi + corallo usato come accento.
   ========================================================== */

/* ---------- Design tokens ---------- */
/*
  Le variabili centrali rendono piu semplice mantenere coerenti colori,
  ombre, raggi e larghezza massima. Se cambia la palette Mowi, questa e la
  prima area da aggiornare invece di cercare valori sparsi nel file.
*/
:root {
  --primary: #005f50;
  --primary-dark: #00463c;
  --primary-deep: #00362f;
  --primary-soft: #e9f5f1;
  --accent: #ff674a;
  --accent-dark: #df5238;
  --accent-soft: #fff0eb;
  --text: #10242f;
  --muted: #5d6f78;
  --white: #ffffff;
  --border: #d5e8e1;
  --shadow: 0 18px 45px rgba(0, 63, 54, .13);
  --radius: 22px;
  --max: 1120px;
}

/* ---------- Base page ---------- */
/*
  Regole globali di reset leggero:
  - border-box evita calcoli imprevisti su larghezze e padding;
  - smooth scroll rende coerenti i link ancora e il pulsante "torna su";
  - container limita la larghezza senza rompere il layout su mobile.
*/
* {
  box-sizing: border-box;
}

html {
  scroll-behavior: smooth;
  scroll-padding-top: 0;
}

body {
  margin: 0;
  font-family: Arial, Helvetica, sans-serif;
  color: var(--text);
  background: #f7fbfa;
  line-height: 1.65;
}

a {
  color: inherit;
}

a:not(.btn):not(.download):hover,
a:not(.btn):not(.download):focus {
  color: var(--accent);
  outline: none;
}

.container {
  width: min(var(--max), calc(100% - 2rem));
  margin: auto;
}

.skip-link {
  position: absolute;
  left: -999px;
  top: 0;
  z-index: 99;
  padding: .7rem 1rem;
  background: var(--white);
  color: var(--primary);
}

.skip-link:focus {
  left: 1rem;
  top: 1rem;
  border-radius: 10px;
  outline: 3px solid var(--accent);
}

/* ---------- Header and navigation ---------- */
/*
  Header sticky: resta visibile durante la navigazione interna senza coprire
  troppo contenuto. Il backdrop-filter crea un effetto vetro leggero quando
  il contenuto scorre sotto la barra.
*/
.header {
  position: sticky;
  top: 0;
  z-index: 10;
  background: rgba(255, 255, 255, .96);
  backdrop-filter: blur(10px);
  border-bottom: 1px solid var(--border);
}

.nav {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 1rem;
  min-height: 76px;
}

.logo {
  position: relative;
  display: flex;
  align-items: center;
  padding: .25rem 0;
  border-radius: 10px;
  text-decoration: none;
  transition: transform .2s;
}

/*
  Il logo ha due immagini sovrapposte: versione standard e versione corallo.
  Al passaggio del mouse viene scambiata solo l'opacita, evitando salti di layout.
*/
.logo:hover,
.logo:focus {
  transform: translateY(-1px);
  outline: none;
}

.logo-img {
  display: block;
  width: 124px;
  max-height: 46px;
  height: auto;
  object-fit: contain;
  transition: opacity .2s;
}

.logo-img-coral {
  position: absolute;
  left: 0;
  top: 50%;
  opacity: 0;
  transform: translateY(-50%);
}

.logo:hover .logo-img-dark,
.logo:focus .logo-img-dark {
  opacity: 0;
}

.logo:hover .logo-img-coral,
.logo:focus .logo-img-coral {
  opacity: 1;
}

.menu {
  display: flex;
  justify-content: flex-end;
  flex-wrap: wrap;
  gap: .35rem;
  margin: 0;
  padding: 0;
  list-style: none;
}

/* I link menu sono pill trasparenti: hover evidente ma senza pesare visivamente. */
.menu a {
  display: block;
  padding: .65rem .9rem;
  border: 1px solid transparent;
  border-radius: 999px;
  color: var(--text);
  font-weight: 700;
  text-decoration: none;
  transition: color .2s, border-color .2s;
}

.menu a:hover,
.menu a:focus {
  background: transparent;
  color: var(--accent);
  border-color: transparent;
  outline: none;
}

/* ---------- Hero ---------- */
/*
  Hero principale:
  - gradiente verde come area di forte identita visiva;
  - riga corallo in alto come accento di marca;
  - cerchio corallo semitrasparente come profondita decorativa, non interattiva.
*/
.hero {
  position: relative;
  overflow: hidden;
  padding: 88px 0 74px;
  background: linear-gradient(135deg, var(--primary-deep) 0%, var(--primary) 58%, #08715f 100%);
  color: var(--white);
}

.hero::before {
  content: "";
  position: absolute;
  left: 0;
  top: 0;
  width: 100%;
  height: 6px;
  background: var(--accent);
}

.hero::after {
  content: "";
  position: absolute;
  right: -130px;
  bottom: -160px;
  width: 430px;
  height: 430px;
  border-radius: 50%;
  background: rgba(255, 103, 74, .23);
}

.hero-grid {
  position: relative;
  z-index: 1;
  display: grid;
  grid-template-columns: 1.15fr .85fr;
  align-items: center;
  gap: 3rem;
}

/* Etichetta breve sopra i titoli di sezione, usata come segnale di categoria. */
.kicker {
  margin: 0 0 1rem;
  color: #bde9dd;
  font-size: .8rem;
  font-weight: 800;
  letter-spacing: .22em;
  text-transform: uppercase;
}

h1 {
  margin: .2rem 0 1.25rem;
  font-size: clamp(2.35rem, 7vw, 5rem);
  line-height: 1.05;
  letter-spacing: -.04em;
}

.lead {
  max-width: 720px;
  margin: 0 0 2rem;
  color: #eefaf6;
  font-size: 1.16rem;
}

.actions {
  display: flex;
  flex-wrap: wrap;
  gap: .8rem;
}

.btn {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  gap: .45rem;
  padding: .85rem 1.15rem;
  border: 2px solid rgba(255, 255, 255, .55);
  border-radius: 999px;
  font-weight: 800;
  text-decoration: none;
  transition: transform .2s, background .2s;
}

/* Stati hover/focus comuni ai bottoni principali. */
.btn:hover,
.btn:focus {
  transform: translateY(-2px);
  outline: none;
}

.btn-primary {
  background: var(--accent);
  color: #fff;
  border-color: var(--accent);
}

.btn-primary:hover,
.btn-primary:focus {
  background: var(--accent-dark);
  border-color: var(--accent-dark);
}

.btn-secondary {
  background: rgba(255, 255, 255, .08);
  color: var(--white);
}

/* ---------- Hero info card ---------- */
/*
  Card laterale del hero. Rimane semi-trasparente per fondersi col gradiente,
  ma ha bordo e ombra sufficienti per separarsi dallo sfondo.
*/
.hero-card {
  padding: 1.55rem;
  border: 1px solid rgba(255, 255, 255, .28);
  border-radius: var(--radius);
  background: rgba(255, 255, 255, .12);
  box-shadow: var(--shadow);
}

.hero-item {
  display: grid;
  grid-template-columns: 76px 1fr;
  align-items: center;
  gap: 1.1rem;
  margin: .9rem 0;
  padding: 1rem 1.1rem;
  border: 1px solid rgba(255, 255, 255, .12);
  border-radius: 20px;
  background: rgba(255, 255, 255, .14);
  transition: background .2s, transform .2s;
}

.hero-item:hover {
  background: rgba(255, 255, 255, .18);
  transform: translateY(-1px);
}

/* Le icone sono centrate assolutamente per evitare disallineamenti tra SVG diversi. */
.hero-icon {
  position: relative;
  display: block;
  flex: 0 0 auto;
  width: 68px;
  height: 68px;
  padding: 0;
  overflow: hidden;
  border-radius: 20px;
  box-shadow: 0 12px 24px rgba(0, 0, 0, .10);
  line-height: 0;
  text-align: center;
}

.hero-icon svg {
  position: absolute;
  top: 50%;
  left: 50%;
  display: block;
  width: 46px;
  min-width: 46px;
  height: 46px;
  min-height: 46px;
  margin: 0;
  overflow: visible;
  fill: none;
  stroke: currentColor;
  stroke-width: 2.25;
  stroke-linecap: round;
  stroke-linejoin: round;
  transform: translate(-50%, -50%);
  vector-effect: non-scaling-stroke;
}

/* Colori differenziati per rendere leggibili le tre informazioni sintetiche. */
.hero-item:nth-child(1) .hero-icon {
  background: var(--accent);
  color: #fff;
}

.hero-item:nth-child(2) .hero-icon {
  background: #fff;
  color: var(--primary);
}

.hero-item:nth-child(3) .hero-icon {
  background: #bde9dd;
  color: var(--primary-dark);
}

.waves-icon {
  transform: translate(-50%, -46%);
}

.hero-item strong {
  display: block;
  font-size: 1.02rem;
}

.hero-item span {
  display: block;
  color: #e7faf5;
  font-size: .95rem;
}

/* ---------- Shared sections and cards ---------- */
/*
  Struttura riutilizzabile delle sezioni:
  - padding verticale uniforme;
  - scroll-margin per evitare che le ancore finiscano sotto l'header sticky;
  - griglie a 2 o 3 colonne che diventano una colonna nei breakpoint.
*/
section {
  padding: 70px 0;
}

section[id] {
  scroll-margin-top: 76px;
}

.section-title {
  margin: 0 0 1rem;
  font-size: clamp(2rem, 4vw, 3rem);
  line-height: 1.12;
  letter-spacing: -.03em;
}

.section-intro {
  max-width: 760px;
  margin: 0 0 2rem;
  color: var(--muted);
  font-size: 1.05rem;
}

.grid-2 {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 1.4rem;
}

.grid-3 {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 1.1rem;
}

.card {
  position: relative;
  overflow: hidden;
  padding: 1.35rem;
  border: 1px solid var(--border);
  border-radius: var(--radius);
  background: var(--white);
  box-shadow: 0 10px 28px rgba(0, 63, 54, .06);
}

/* Barra superiore corallo per dare gerarchia alle card senza aggiungere markup. */
.card::before {
  content: "";
  position: absolute;
  left: 0;
  top: 0;
  width: 100%;
  height: 4px;
  background: var(--accent);
  opacity: .9;
}

.card h3 {
  margin: .2rem 0 .55rem;
  font-size: 1.25rem;
}

.card p {
  margin: .4rem 0;
  color: #263e48;
}

.pale {
  background: var(--primary-soft);
}

/* ---------- Process card ---------- */
/*
  Schema "Come opera Mowi": usa una linea verticale generata via pseudo-elemento
  e tre step. La linea sta sotto le icone grazie allo z-index degli elementi
  .process-icon.
*/
.process-card {
  background: rgba(255, 255, 255, .64);
}

.process-steps {
  position: relative;
  display: grid;
  gap: 1rem;
  margin: 1.35rem 0 1rem;
}

.process-steps::before {
  content: "";
  position: absolute;
  left: 45px;
  top: 20px;
  bottom: 20px;
  width: 4px;
  border-radius: 999px;
  background: linear-gradient(to bottom, var(--accent), rgba(255, 103, 74, .18));
}

.process-step {
  position: relative;
  display: grid;
  grid-template-columns: 72px 1fr;
  align-items: center;
  gap: 1rem;
  padding: 1rem 1rem 1rem 1.15rem;
  border: 1px solid var(--border);
  border-radius: 22px;
  background: rgba(255, 255, 255, .92);
  box-shadow: 0 10px 26px rgba(0, 63, 54, .06);
}

.process-icon {
  position: relative;
  z-index: 1;
  display: flex;
  align-items: center;
  justify-content: center;
  width: 54px;
  height: 54px;
  border-radius: 18px;
  box-shadow: 0 8px 18px rgba(0, 0, 0, .06);
}

.process-icon svg {
  width: 30px;
  height: 30px;
  fill: none;
  stroke: currentColor;
  stroke-width: 2;
  stroke-linecap: round;
  stroke-linejoin: round;
}

.process-copy strong {
  display: block;
  margin-bottom: .25rem;
  color: var(--text);
  font-size: 1.05rem;
}

.process-copy p {
  margin: 0;
  color: #35515c;
  line-height: 1.5;
}

/* Le classi icon-* tengono separato il colore semantico di ogni fase della filiera. */
.icon-feed {
  background: var(--accent-soft);
  color: var(--accent-dark);
}

.icon-farming {
  background: #dff3ee;
  color: var(--primary);
}

.icon-sales {
  background: #fff4d9;
  color: #a06900;
}

/* ---------- Report downloads ---------- */
/*
  Lista dei report scaricabili nel corpo pagina. Ogni riga e una piccola scheda:
  testo a sinistra, CTA a destra su desktop, impilata su mobile.
*/
.report-list {
  display: grid;
  gap: 1rem;
}

.report {
  display: grid;
  grid-template-columns: 1fr auto;
  align-items: center;
  gap: 1rem;
  padding: 1rem 1.1rem;
  border: 1px solid var(--border);
  border-radius: 18px;
  background: var(--white);
  box-shadow: 0 8px 24px rgba(0, 63, 54, .05);
}

.report small {
  display: block;
  color: var(--accent-dark);
  font-weight: 800;
  letter-spacing: .12em;
  text-transform: uppercase;
}

.download {
  padding: .7rem 1rem;
  border-radius: 999px;
  background: var(--primary);
  color: var(--white);
  font-weight: 800;
  text-decoration: none;
  white-space: nowrap;
  transition: background .2s, transform .2s;
}

.download:hover,
.download:focus {
  background: var(--accent);
  color: var(--white);
  outline: 3px solid rgba(255, 103, 74, .28);
  transform: translateY(-1px);
}

/* Nota informativa finale: usa il colore accent soft per sembrare un avviso leggero. */
.note {
  padding: 1rem;
  border: 1px solid rgba(255, 103, 74, .45);
  border-radius: 18px;
  background: var(--accent-soft);
  color: #4a2a22;
}

.note a {
  color: var(--primary);
  font-weight: 800;
  text-decoration-thickness: 2px;
  text-underline-offset: 3px;
}

.note a:hover,
.note a:focus {
  color: var(--accent-dark);
}

/* ---------- Footer ---------- */
/*
  Footer a tre colonne:
  1. brand e descrizione;
  2. collegamenti alle sezioni;
  3. documenti con pulsanti PDF.
  Le colonne si impilano nel breakpoint tablet/mobile.
*/
.footer {
  padding: 44px 0 28px;
  border-top: 6px solid var(--accent);
  background: linear-gradient(135deg, var(--primary-deep), #003f36);
  color: #dff3ee;
}

.footer-grid {
  display: grid;
  grid-template-columns: 1.25fr .75fr .9fr;
  align-items: start;
  gap: 1.5rem;
}

.footer p {
  margin: .2rem 0;
}

.footer strong {
  color: #fff;
}

.footer small {
  display: block;
  margin-top: 1rem;
  color: #a9d3ca;
}

.footer a {
  color: #fff;
  font-weight: 700;
  text-decoration: none;
}

.footer a:hover,
.footer a:focus {
  color: var(--accent);
  text-decoration: none;
  outline: none;
}

.footer-brand {
  display: flex;
  align-items: center;
  gap: .9rem;
  margin-bottom: .4rem;
}

.footer-logo {
  width: 88px;
  height: auto;
  filter: brightness(0) invert(1);
  opacity: .96;
}

.footer-accent {
  width: 85px;
  height: 5px;
  margin: .7rem 0 1rem;
  border-radius: 999px;
  background: var(--accent);
}

/*
  Allineamento footer:
  .footer-list e .footer-documents condividono gap e altezza riga.
  Cosi "Azienda", "Sostenibilita", "Report" risultano allineati in verticale
  con i tre documenti e con i pulsanti PDF a destra.
*/
.footer-list,
.footer-documents {
  display: grid;
  gap: .35rem;
  margin: .4rem 0 0;
  padding: 0;
  list-style: none;
}

.footer-list li,
.footer-document {
  min-height: 34px;
}

.footer-list li {
  display: flex;
  align-items: center;
}

.footer-list a {
  font-weight: 400;
  line-height: 1.35;
}

.footer-document {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: .75rem;
}

.footer-document span {
  line-height: 1.35;
}

/*
  Pulsante PDF nel footer:
  pill compatta con icona download + testo "PDF". flex:0 0 auto impedisce che
  il bottone si schiacci quando il titolo del documento e lungo.
*/
.footer-pdf-download {
  display: inline-flex;
  flex: 0 0 auto;
  align-items: center;
  justify-content: center;
  gap: .35rem;
  min-width: 66px;
  height: 32px;
  padding: 0 .7rem;
  border: 1px solid rgba(255, 255, 255, .34);
  border-radius: 999px;
  background: rgba(255, 255, 255, .10);
  color: #fff;
  font-size: .78rem;
  font-weight: 800;
  line-height: 1;
  letter-spacing: .01em;
  text-decoration: none;
  transition: background .2s, border-color .2s, color .2s, transform .2s;
}

.footer-pdf-download svg {
  width: 15px;
  height: 15px;
  fill: none;
  stroke: currentColor;
  stroke-width: 2.4;
  stroke-linecap: round;
  stroke-linejoin: round;
}

.footer-pdf-download:hover,
.footer-pdf-download:focus {
  background: rgba(255, 255, 255, .18);
  border-color: rgba(255, 255, 255, .62);
  color: #fff;
  outline: 3px solid rgba(255, 255, 255, .16);
  transform: translateY(-1px);
}

/* ---------- Floating back-to-top control ---------- */
/*
  Stato base del pulsante "torna su": e presente nel DOM ma nascosto.
  opacity + visibility + pointer-events lavorano insieme:
  - opacity consente la transizione trasparente;
  - visibility lo rimuove dalla resa visibile;
  - pointer-events evita click accidentali quando nascosto.
*/
.back-to-top {
  position: fixed;
  right: 1.35rem;
  bottom: 1.35rem;
  z-index: 20;
  display: inline-flex;
  align-items: center;
  justify-content: center;
  width: 48px;
  height: 48px;
  border: 1px solid rgba(255, 255, 255, .55);
  border-radius: 999px;
  background: var(--primary);
  color: #fff;
  box-shadow: 0 14px 30px rgba(0, 63, 54, .24);
  cursor: pointer;
  opacity: 0;
  visibility: hidden;
  pointer-events: none;
  transform: translateY(16px);
  transition: opacity .28s ease, transform .28s ease, visibility .28s ease, background .2s ease, border-color .2s ease;
}

/* Stato attivo assegnato da script.js quando la pagina supera la soglia di scroll. */
.back-to-top.is-visible {
  opacity: 1;
  visibility: visible;
  pointer-events: auto;
  transform: translateY(0);
}

.back-to-top:hover,
.back-to-top:focus {
  background: var(--accent);
  border-color: var(--accent);
  outline: 3px solid rgba(255, 103, 74, .28);
}

.back-to-top svg {
  width: 24px;
  height: 24px;
  fill: none;
  stroke: currentColor;
  stroke-width: 2.5;
  stroke-linecap: round;
  stroke-linejoin: round;
}

/* ---------- Responsive layout ---------- */
/*
  Breakpoint 860px: passaggio da layout a colonne a layout verticale.
  Questo copre tablet e schermi stretti senza duplicare componenti.
*/
@media (max-width: 860px) {
  .hero-grid,
  .grid-2,
  .grid-3,
  .footer-grid {
    grid-template-columns: 1fr;
  }

  .hero {
    padding: 62px 0;
  }

  .nav {
    align-items: flex-start;
    flex-direction: column;
    padding: 1rem 0;
  }

  .menu {
    justify-content: flex-start;
  }

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

  .download {
    width: max-content;
  }
}

/*
  Breakpoint 520px: rifiniture per smartphone piccoli.
  Riduce logo, padding, icone e bottone flottante per preservare spazio utile.
*/
@media (max-width: 520px) {
  .container {
    width: min(100% - 1.2rem, var(--max));
  }

  .logo-img {
    width: 108px;
  }

  .menu a {
    padding: .45rem .55rem;
  }

  .card,
  .hero-card {
    padding: 1rem;
  }

  .hero-item {
    grid-template-columns: 64px 1fr;
    padding: .9rem;
  }

  .hero-icon {
    width: 60px;
    height: 60px;
  }

  .hero-icon svg {
    width: 40px;
    min-width: 40px;
    height: 40px;
    min-height: 40px;
  }

  .report {
    padding: 1rem;
  }

  .btn {
    width: 100%;
  }

  .back-to-top {
    right: .9rem;
    bottom: .9rem;
    width: 44px;
    height: 44px;
  }
}