/* =========================================================
   IL SAGGIO — esperienza immersiva scroll-sincronizzata
   Lo scroll è la profondità. La profondità è il tempo.
   ========================================================= */

:root{
  --carta:      #E7EAE4;
  --inchiostro: #14201C;
  --segnale:    #4E7BFF;   /* cobalto, alzato di luminanza per fondo scuro */
  --grafite:    #8C9089;
  --terra:      #100D09;
  --vetro:      rgba(14,12,9,.62);
  --linea:      rgba(231,234,228,.16);

  --display: "Archivo", system-ui, sans-serif;
  --testo:   "Newsreader", Georgia, serif;
  --dato:    "IBM Plex Mono", ui-monospace, monospace;

  --panel-h: 165vh;
  --e-expo: cubic-bezier(.16,1,.3,1);
}

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

html{ scroll-behavior:smooth; }

body.scavo{
  margin:0;
  background:var(--terra);
  color:var(--carta);
  font-family:var(--testo);
  line-height:1.62;
  -webkit-font-smoothing:antialiased;
  overflow-x:hidden;
}

:focus-visible{ outline:2px solid var(--segnale); outline-offset:3px; }

/* ---------- tela fissa ---------- */

#tela{
  position:fixed;
  inset:0;
  width:100%;
  height:100%;
  z-index:0;
  display:block;
}

.vignetta{
  position:fixed;
  inset:0;
  z-index:1;
  pointer-events:none;
  background:
    radial-gradient(120% 85% at 50% 42%, transparent 30%, rgba(8,6,4,.55) 72%, rgba(8,6,4,.9) 100%);
}

.grana{
  position:fixed;
  inset:-50%;
  z-index:2;
  pointer-events:none;
  opacity:.14;
  background-image:url("data:image/svg+xml;utf8,<svg xmlns='http://www.w3.org/2000/svg' width='200' height='200'><filter id='n'><feTurbulence type='fractalNoise' baseFrequency='.9' numOctaves='3'/></filter><rect width='200' height='200' filter='url(%23n)' opacity='.5'/></svg>");
  animation:grana 1.1s steps(3) infinite;
}
@keyframes grana{
  0%{transform:translate(0,0)} 33%{transform:translate(-3%,2%)} 66%{transform:translate(2%,-3%)}
}

/* ---------- testata ---------- */

.testa{
  position:fixed;
  top:0; left:0; right:0;
  z-index:20;
  display:flex;
  align-items:center;
  justify-content:space-between;
  gap:20px;
  padding:22px clamp(18px,4vw,44px);
  mix-blend-mode:difference;
}
.testa a{ color:var(--carta); text-decoration:none; }
.testa__logo{
  font-family:var(--display);
  font-variation-settings:"wdth" 108,"wght" 680;
  font-size:13px;
  letter-spacing:.08em;
  text-transform:uppercase;
}
.testa__esci{
  font-family:var(--dato);
  font-size:11px;
  letter-spacing:.14em;
  text-transform:uppercase;
  border-bottom:1px solid rgba(231,234,228,.4);
  padding-bottom:3px;
}

/* ---------- asta di profondità (firma) ---------- */

.asta{
  position:fixed;
  top:0; bottom:0;
  left:clamp(14px,3vw,40px);
  width:78px;
  z-index:15;
  display:flex;
  flex-direction:column;
  justify-content:center;
  pointer-events:none;
}
.asta__scala{
  position:relative;
  height:58vh;
  border-left:1px solid rgba(231,234,228,.3);
  margin-left:22px;
}
.asta__tacca{
  position:absolute;
  left:0;
  width:9px;
  height:1px;
  background:rgba(231,234,228,.3);
}
.asta__tacca--m{ width:18px; background:rgba(231,234,228,.55); }
.asta__tacca span{
  position:absolute;
  left:24px;
  top:-8px;
  font-family:var(--dato);
  font-size:9px;
  letter-spacing:.1em;
  color:rgba(231,234,228,.5);
  white-space:nowrap;
}
.asta__cursore{
  position:absolute;
  left:-5px;
  width:11px; height:11px;
  border-radius:50%;
  background:var(--segnale);
  box-shadow:0 0 0 4px rgba(78,123,255,.22);
  transform:translateY(-50%);
}
.asta__quota{
  margin:22px 0 0 22px;
  font-family:var(--dato);
  font-size:11px;
  letter-spacing:.1em;
  color:var(--carta);
}
.asta__quota b{
  display:block;
  font-family:var(--display);
  font-variation-settings:"wdth" 118,"wght" 620;
  font-size:26px;
  letter-spacing:-.02em;
  line-height:1;
  font-variant-numeric:tabular-nums;
}
.asta__strato{
  margin:14px 0 0 22px;
  max-width:150px;
  font-family:var(--dato);
  font-size:10px;
  line-height:1.6;
  letter-spacing:.09em;
  text-transform:uppercase;
  color:var(--segnale);
}

/* ---------- scorrimento e schede ---------- */

.scorrimento{ position:relative; z-index:10; }

.panel{ min-height:var(--panel-h); }
.panel--corto{ min-height:120vh; }

.pin{
  position:sticky;
  top:0;
  height:100vh;
  display:flex;
  align-items:center;
  padding-inline:clamp(20px,6vw,90px) clamp(20px,6vw,90px);
  padding-left:clamp(110px,13vw,190px);
}

.scheda{
  max-width:540px;
  background:var(--vetro);
  backdrop-filter:blur(14px);
  border:1px solid var(--linea);
  padding:clamp(26px,3vw,40px);
  opacity:0;
  transform:translateY(28px);
  transition:opacity .85s var(--e-expo), transform .95s var(--e-expo);
}
.scheda--destra{ margin-left:auto; }
.panel.dentro .scheda{ opacity:1; transform:none; }

.scheda__eyebrow{
  display:flex;
  align-items:center;
  gap:12px;
  font-family:var(--dato);
  font-size:10px;
  letter-spacing:.2em;
  text-transform:uppercase;
  color:var(--segnale);
  margin:0 0 20px;
}
.scheda__eyebrow::before{
  content:"";
  width:26px; height:1px;
  background:var(--segnale);
  flex:none;
}
.scheda h2{
  font-family:var(--display);
  font-variation-settings:"wdth" 114,"wght" 600;
  font-size:clamp(26px,3.4vw,44px);
  line-height:1.03;
  letter-spacing:-.03em;
  margin:0 0 18px;
  text-wrap:balance;
}
.scheda h2 em{
  font-family:var(--testo);
  font-style:italic;
  font-weight:300;
  font-variation-settings:normal;
}
.scheda p{
  margin:0;
  font-size:clamp(16px,1.15vw,18px);
  color:rgba(231,234,228,.8);
  max-width:48ch;
}
.scheda p + p{ margin-top:.9em; }

.scheda__dl{
  display:grid;
  grid-template-columns:repeat(2,minmax(0,1fr));
  gap:0;
  margin-top:28px;
  border-top:1px solid var(--linea);
}
.scheda__dl > div{
  padding:13px 0;
  border-bottom:1px solid var(--linea);
}
.scheda__dl dt{
  font-family:var(--dato);
  font-size:9px;
  letter-spacing:.18em;
  text-transform:uppercase;
  color:var(--grafite);
  margin-bottom:4px;
}
.scheda__dl dd{ margin:0; font-size:15px; }

/* ---------- apertura ---------- */

.apertura .pin{ padding-left:clamp(110px,13vw,190px); }
.apertura .scheda{
  background:none;
  border:0;
  backdrop-filter:none;
  padding:0;
  max-width:660px;
  opacity:1;
  transform:none;
}
.titolo{
  font-family:var(--display);
  font-variation-settings:"wdth" 120,"wght" 640;
  font-size:clamp(40px,7vw,96px);
  line-height:.95;
  letter-spacing:-.04em;
  margin:0;
  text-shadow:0 1px 2px rgba(0,0,0,.5);
}
.titolo em{
  font-family:var(--testo);
  font-style:italic;
  font-weight:300;
  font-variation-settings:normal;
  letter-spacing:-.02em;
}
.ln{ display:block; overflow:hidden; }
.ln > i{
  display:block;
  font-style:inherit;
  transform:translateY(106%);
  animation:sale 1s var(--e-expo) forwards;
}
.ln:nth-child(2) > i{ animation-delay:.1s; }
.ln:nth-child(3) > i{ animation-delay:.2s; }
@keyframes sale{ to{ transform:none; } }

.invito{
  margin-top:44px;
  display:flex;
  align-items:center;
  gap:14px;
  font-family:var(--dato);
  font-size:11px;
  letter-spacing:.18em;
  text-transform:uppercase;
  color:rgba(231,234,228,.7);
  opacity:0;
  animation:appare 1s var(--e-expo) .9s forwards;
}
.invito__freccia{
  width:1px; height:30px;
  background:linear-gradient(to bottom,var(--segnale),transparent);
  animation:scende 2.2s ease-in-out infinite;
}
@keyframes appare{ to{ opacity:1; } }
@keyframes scende{
  0%,100%{ transform:translateY(0); opacity:1; }
  50%{ transform:translateY(9px); opacity:.35; }
}

/* ---------- reperto in evidenza ---------- */

.reperto{
  position:fixed;
  z-index:12;
  left:50%;
  bottom:clamp(26px,5vh,56px);
  transform:translateX(-50%) translateY(14px);
  display:flex;
  align-items:center;
  gap:16px;
  padding:12px 20px;
  background:var(--vetro);
  backdrop-filter:blur(14px);
  border:1px solid var(--linea);
  opacity:0;
  pointer-events:none;
  transition:opacity .5s ease, transform .6s var(--e-expo);
}
.reperto[data-visibile]{ opacity:1; transform:translateX(-50%) translateY(0); }
.reperto b{
  font-family:var(--display);
  font-variation-settings:"wdth" 110,"wght" 600;
  font-size:15px;
  letter-spacing:-.01em;
}
.reperto span{
  font-family:var(--dato);
  font-size:10px;
  letter-spacing:.14em;
  text-transform:uppercase;
  color:var(--segnale);
}
.reperto i{
  display:block;
  width:1px; height:20px;
  background:var(--linea);
}

/* ---------- uscita ---------- */

.uscita{
  position:relative;
  z-index:10;
  background:var(--inchiostro);
  padding-block:clamp(80px,12vh,150px);
  text-align:center;
}
.uscita__in{
  max-width:760px;
  margin-inline:auto;
  padding-inline:clamp(20px,5vw,40px);
}
.uscita h2{
  font-family:var(--display);
  font-variation-settings:"wdth" 116,"wght" 620;
  font-size:clamp(30px,5vw,62px);
  line-height:1.02;
  letter-spacing:-.035em;
  margin:0 0 22px;
  text-wrap:balance;
}
.uscita p{
  font-size:clamp(17px,1.4vw,20px);
  color:rgba(231,234,228,.78);
  margin:0 auto 34px;
  max-width:52ch;
}
.bottone{
  display:inline-flex;
  align-items:center;
  gap:12px;
  font-family:var(--dato);
  font-size:12px;
  letter-spacing:.14em;
  text-transform:uppercase;
  text-decoration:none;
  padding:16px 30px;
  border:1px solid var(--carta);
  color:var(--carta);
  transition:background .3s, color .3s;
}
.bottone:hover{ background:var(--carta); color:var(--inchiostro); }
.bottone--pieno{ background:var(--carta); color:var(--inchiostro); }
.bottone--pieno:hover{ background:var(--segnale); border-color:var(--segnale); color:#fff; }

.uscita__note{
  margin-top:46px;
  padding-top:24px;
  border-top:1px solid rgba(231,234,228,.14);
  font-family:var(--dato);
  font-size:10px;
  letter-spacing:.12em;
  line-height:1.9;
  color:var(--grafite);
  text-transform:uppercase;
}

/* ---------- responsive ---------- */

@media (max-width:900px){
  :root{ --panel-h:140vh; }
  .asta{ left:10px; width:56px; }
  .asta__scala{ height:44vh; margin-left:10px; }
  .asta__tacca span{ display:none; }
  .asta__quota,.asta__strato{ margin-left:10px; }
  .asta__strato{ max-width:100px; }
  .pin{ padding-left:clamp(78px,20vw,120px); padding-right:20px; }
  .scheda{ max-width:none; }
  .scheda--destra{ margin-left:0; }
  .reperto{ left:20px; right:20px; transform:none; bottom:20px; }
  .reperto[data-visibile]{ transform:none; }
}

@media (prefers-reduced-motion:reduce){
  html{ scroll-behavior:auto; }
  *,*::before,*::after{
    animation-duration:.01ms !important;
    animation-iteration-count:1 !important;
    transition-duration:.01ms !important;
  }
  .grana{ display:none; }
  .ln > i{ transform:none; }
  .invito{ opacity:1; }
  .scheda{ opacity:1; transform:none; }
}