/* =============================================================================
   HELIX — shared.css
   Direzione: "MATERIA"
   Elica fisica di VETRO OTTICO + ORO LIQUIDO, su atmosfera di galleria d'arte
   chiara e calda. Off-white caldo, inchiostro caldo, oro come unico accento
   dominante, iridescenza fredda SOLO come luce del vetro (mai come UI).
   Tre voci tipografiche con ruoli: Fraunces (display) / General Sans (body) /
   Space Grotesk (telemetria mono). Grana finissima su tutto.
   Stili condivisi da TUTTE le pagine (Home / Lavori / Studio / Contatti).
   ============================================================================= */

/* ---------- View Transitions cross-document (transizioni cucite tra pagine) -- */
@view-transition { navigation: auto; }

/* =========================== TOKEN SEMANTICI =============================== */
:root{
  /* --- Palette GALLERIA: off-white caldo, mai #fff/#000 puri --- */
  --paper:      #F4F1EA;   /* off-white caldo: fondo pagina */
  --paper-deep: #ECE7DD;   /* fondo del gradiente / superfici incassate */
  --paper-lift: #FAF7F0;   /* superficie sollevata, luce in alto */
  --ink:        #1A1714;   /* inchiostro caldo (mai #000) — testo principale */
  --ink-soft:   #6A6157;   /* testo secondario desaturato */
  --ink-faint:  #9A9085;   /* metadati / terziario */
  --line:       rgba(26,23,20,.12);
  --line-soft:  rgba(26,23,20,.07);
  --line-strong:rgba(26,23,20,.22);

  /* --- Oro: unico accento dominante (su forme NON-testo) --- */
  --gold:       #E8B45A;   /* oro caldo, high-key */
  --gold-deep:  #C8922E;   /* oro scuro: testo su chiaro, hover */
  --gold-ink:   #8A5E16;   /* oro per testo lungo (contrasto AA) */

  /* --- Iridescenza del vetro: ciano/magenta DESATURATI, SOLO luce, mai UI --- */
  --iris-cold:  #7FB6C9;   /* ciano spento — riflessi vetro */
  --iris-warm:  #C99FB6;   /* magenta spento — caustiche */

  /* --- Type scale fluida (clamp): voce editoriale, oversize --- */
  --fs-display:clamp(2.7rem,8.6vw,7.8rem);   /* h1 hero */
  --fs-h2:clamp(1.95rem,4.6vw,3.8rem);
  --fs-h3:clamp(1.5rem,3vw,2.5rem);
  --fs-h4:clamp(1.22rem,2.2vw,1.85rem);
  --fs-lead:clamp(1.02rem,1.5vw,1.24rem);    /* paragrafo guida */
  --fs-body:1.02rem;
  --fs-small:.88rem;
  --fs-meta:.72rem;                           /* telemetria mono */

  /* --- Spacing (scala con un ritmo, non uniforme) --- */
  --sp-1:.5rem; --sp-2:1rem; --sp-3:1.5rem; --sp-4:2.5rem; --sp-5:4rem; --sp-6:6rem;
  --sp-section:clamp(5rem,12vh,11rem);

  /* --- Radius: gerarchia con un motivo (mai un radius unico ovunque) --- */
  --r-sharp:2px;                 /* spigolo dichiarato */
  --r-soft:12px;                 /* superfici morbide */
  --r-cut:2px 14px 2px 14px;     /* taglio asimmetrico firma (chip/cta) */

  /* --- Motion language: 3 durate + easing custom, riusati ovunque --- */
  --d-fast:.22s;
  --d-norm:.6s;
  --d-slow:1.6s;
  --ease-glass:cubic-bezier(.16,1,.3,1);     /* ingresso fluido, lunga decelerazione */
  --ease-soft:cubic-bezier(.65,.05,.36,1);   /* push/pull */
  --ease-out:cubic-bezier(.22,.61,.36,1);

  /* --- Layout --- */
  --maxw:1280px;
  --gutter:clamp(18px,5vw,52px);

  /* --- Font stack semantici (TRE voci con ruoli, NO Inter) --- */
  --font-display:"Fraunces",Georgia,"Times New Roman",serif;             /* titoli drammatici */
  --font-sans:"General Sans","Switzer",ui-sans-serif,system-ui,"Segoe UI",sans-serif; /* body lungo, NON Inter */
  --font-mono:"Space Grotesk",ui-monospace,"SFMono-Regular",monospace;   /* telemetria/label/metadati */
}

/* =============================== RESET ===================================== */
*{box-sizing:border-box;margin:0;padding:0}
html{-webkit-text-size-adjust:100%;scroll-behavior:auto}
body{
  /* il gradiente caldo da galleria dietro il canvas (il vetro lo rifrange) */
  background:
    radial-gradient(120% 110% at 50% 30%, var(--paper-lift) 0%, var(--paper) 44%, var(--paper-deep) 100%) fixed,
    var(--paper);
  color:var(--ink);
  font-family:var(--font-sans);
  font-weight:400;
  line-height:1.6;
  overflow-x:hidden;
  -webkit-font-smoothing:antialiased;
  text-rendering:optimizeLegibility;
}
a{color:inherit;text-decoration:none}
img{max-width:100%;display:block}
::selection{background:var(--gold);color:#2A1C06}

/* focus visibile (accessibilità) */
:focus-visible{
  outline:2px solid var(--gold-deep);
  outline-offset:3px;
  border-radius:var(--r-sharp);
}

/* =========================== GRANA + CORNICE ============================== */
/* Grana finissima globale: rompe la perfezione plasticosa (marchio anti-IA). */
.grain{
  position:fixed;inset:-50%;z-index:90;pointer-events:none;
  opacity:.06;mix-blend-mode:multiply;
  background-image:url("data:image/svg+xml,%3Csvg xmlns='http://www.w3.org/2000/svg' width='200' height='200'%3E%3Cfilter id='n'%3E%3CfeTurbulence type='fractalNoise' baseFrequency='0.9' numOctaves='2' stitchTiles='stitch'/%3E%3C/filter%3E%3Crect width='100%25' height='100%25' filter='url(%23n)'/%3E%3C/svg%3E");
  animation:grain 1.2s steps(4) infinite;
}
@keyframes grain{
  0%{transform:translate(0,0)} 25%{transform:translate(-2%,1.5%)}
  50%{transform:translate(1.5%,-2%)} 75%{transform:translate(-1.5%,-1.5%)} 100%{transform:translate(2%,1.5%)}
}
/* Vignettatura calda morbida: incornicia l'oggetto come in una galleria. */
.vignette{
  position:fixed;inset:0;z-index:80;pointer-events:none;
  box-shadow:inset 0 0 240px 30px rgba(80,64,40,.10);
}

/* =========================== SCENA PERSISTENTE ============================ */
/* UN canvas WebGL montato una volta, dietro TUTTE le pagine. Fisso, dietro al
   contenuto, davanti al solo gradiente del body. Lo pilota lo scroll (shared.js). */
#helix-stage{
  position:fixed;inset:0;z-index:1;pointer-events:none;
  opacity:0;transition:opacity var(--d-slow) var(--ease-out);
}
#helix-stage.is-ready{opacity:1}
#helix-stage canvas{display:block;width:100%;height:100%}

/* Tutto il contenuto vive SOPRA il canvas. */
.page{position:relative;z-index:10}

/* =========================== HUD TELEMETRIA SCENA ======================== */
/* Montati da shared.js (ensureHUD) solo se la pagina lo chiede. Firma da studio:
   SCROLL · n% · SPIN n× · materiale. Mono, tabular-nums, oro come accento. */
#helix-hud{
  position:fixed;right:var(--gutter);top:clamp(82px,13vh,118px);z-index:60;
  pointer-events:none;user-select:none;white-space:nowrap;text-align:right;
  font-family:var(--font-mono);font-size:var(--fs-meta);letter-spacing:.18em;text-transform:uppercase;
  color:var(--ink-faint);font-variant-numeric:tabular-nums;
}
#helix-hud .dot{color:var(--gold-deep)}
#helix-hud b{color:var(--ink);font-weight:500}
#helix-progress{
  position:fixed;left:0;bottom:0;height:2px;width:0%;z-index:60;pointer-events:none;
  background:linear-gradient(90deg,transparent,var(--gold-deep),var(--gold));
}
@media(max-width:680px){ #helix-hud{display:none} }

/* =========================== FALLBACK SCENA ============================== */
/* WebGL assente / GPU debole / reduced-motion → poster statico elegante, MAI
   schermo vuoto. Disegnato in CSS: doppia elica accennata + wordmark. */
#helix-fallback{
  position:fixed;inset:0;z-index:1;pointer-events:none;display:none;
  background:
    radial-gradient(120% 120% at 50% 28%, var(--paper-lift) 0%, var(--paper) 46%, var(--paper-deep) 100%);
}
#helix-fallback.on{display:block}
/* coerente col meccanismo: l'elica accennata sta sul LATO DESTRO (contenuti a sx) */
#helix-fallback .fb-helix{
  position:absolute;right:clamp(20px,8vw,120px);top:50%;transform:translateY(-50%);
  width:min(34vw,300px);height:min(78vh,560px);opacity:.9;
}
@media(max-width:820px){
  #helix-fallback .fb-helix{
    right:auto;left:50%;transform:translate(-50%,-50%);top:42%;opacity:.5;
    width:min(60vw,300px);
  }
}

/* =========================== LOADER SIPARIO =============================== */
/* Copre il flash iniziale finché la scena è pronta. Galleria chiara: counter
   mono, oro. Montato/animato da shared.js (initLoader); qui solo la pelle. */
.curtain{
  position:fixed;inset:0;z-index:200;
  background:
    radial-gradient(120% 120% at 50% 30%, var(--paper-lift) 0%, var(--paper) 46%, var(--paper-deep) 100%);
  display:flex;flex-direction:column;align-items:center;justify-content:center;gap:26px;
  will-change:transform;
}
.curtain-mark{
  font-family:var(--font-display);font-weight:500;font-size:clamp(18px,4vw,26px);
  letter-spacing:.5em;padding-left:.5em;color:var(--ink);opacity:.9;
}
.curtain-count{
  font-family:var(--font-mono);font-variant-numeric:tabular-nums;
  font-size:clamp(3rem,12vw,6.6rem);line-height:1;color:var(--gold-deep);letter-spacing:.02em;
}
.curtain-bar{width:min(220px,52vw);height:1px;background:var(--line-strong);overflow:hidden}
.curtain-bar-fill{
  display:block;width:100%;height:100%;background:linear-gradient(90deg,var(--gold),var(--gold-deep));
  transform:scaleX(0);transform-origin:left;will-change:transform;
}
.curtain.is-static{transition:opacity var(--d-norm) var(--ease-out)}
.curtain.is-static.curtain--up{opacity:0;pointer-events:none}
.curtain.is-static .curtain-count{color:var(--ink-soft)}

/* =============================== NAV ====================================== */
/* Su fondo chiaro: niente mix-blend difference. Una sottile barra di vetro che
   si "appoggia" quando si scrolla (additivo via classe .scrolled da shared.js). */
nav.site-nav{
  position:fixed;top:0;left:0;right:0;z-index:70;
  display:flex;align-items:center;justify-content:space-between;
  padding:16px var(--gutter);
  transition:background var(--d-norm) var(--ease-out),box-shadow var(--d-norm) var(--ease-out),padding var(--d-norm) var(--ease-out);
}
nav.site-nav.scrolled{
  background:rgba(244,241,234,.72);
  backdrop-filter:saturate(120%) blur(12px);
  -webkit-backdrop-filter:saturate(120%) blur(12px);
  box-shadow:0 1px 0 var(--line);
  padding-top:12px;padding-bottom:12px;
}
.wordmark{
  font-family:var(--font-display);font-weight:500;font-size:19px;
  letter-spacing:.42em;padding-left:.42em;color:var(--ink);
  view-transition-name:wordmark;
}
.nav-links{
  display:flex;align-items:center;gap:26px;
  font-family:var(--font-mono);font-size:12px;letter-spacing:.14em;text-transform:uppercase;color:var(--ink);
}
.nav-links a{position:relative;opacity:.62;transition:opacity var(--d-fast) var(--ease-out)}
.nav-links a::after{
  content:"";position:absolute;left:0;right:0;bottom:-6px;height:1px;
  background:var(--gold-deep);transform:scaleX(0);transform-origin:left;
  transition:transform var(--d-norm) var(--ease-glass);
}
.nav-links a:hover{opacity:1}
.nav-links a:active{opacity:.8}
.nav-links a:hover::after,
.nav-links a[aria-current="page"]::after{transform:scaleX(1)}
.nav-links a[aria-current="page"]{opacity:1}

/* CTA dentro la nav */
.nav-cta{
  font-family:var(--font-mono);font-size:11.5px;letter-spacing:.1em;text-transform:uppercase;
  color:var(--paper);background:var(--ink);padding:9px 16px;border-radius:var(--r-cut);
  transition:transform var(--d-fast) var(--ease-out),background var(--d-fast) var(--ease-out);will-change:transform;
}
.nav-cta::after{display:none}
.nav-cta:hover{transform:translateY(-1px);background:var(--gold-deep)}
.nav-cta:active{transform:scale(.96)}

/* hamburger (mobile) */
.nav-toggle{display:none}
@media(max-width:720px){
  .nav-links{
    position:fixed;inset:0;z-index:69;
    flex-direction:column;justify-content:center;gap:34px;
    background:rgba(244,241,234,.97);backdrop-filter:blur(10px);
    font-size:18px;letter-spacing:.1em;
    opacity:0;pointer-events:none;transform:translateY(-8px);
    transition:opacity var(--d-norm) var(--ease-out),transform var(--d-norm) var(--ease-out);
  }
  nav.site-nav.open .nav-links{opacity:1;pointer-events:auto;transform:none}
  .nav-toggle{
    display:flex;flex-direction:column;gap:5px;z-index:71;
    background:none;border:0;cursor:pointer;padding:6px;
  }
  .nav-toggle span{display:block;width:24px;height:2px;background:var(--ink);transition:transform var(--d-fast) var(--ease-out),opacity var(--d-fast)}
  nav.site-nav.open .nav-toggle span:nth-child(1){transform:translateY(7px) rotate(45deg)}
  nav.site-nav.open .nav-toggle span:nth-child(2){opacity:0}
  nav.site-nav.open .nav-toggle span:nth-child(3){transform:translateY(-7px) rotate(-45deg)}
}

/* =============================== TIPOGRAFIA =============================== */
h1{
  font-family:var(--font-display);font-weight:400;
  font-size:var(--fs-display);line-height:.95;letter-spacing:-.022em;
  text-wrap:balance;color:var(--ink);
}
h1 em{font-style:italic;font-weight:300;color:var(--gold-deep)}
h1 .line{display:block;overflow:hidden}
h1 .line > span{display:block;will-change:transform}

h2{
  font-family:var(--font-display);font-weight:300;
  font-size:var(--fs-h2);line-height:1.04;letter-spacing:-.016em;text-wrap:balance;color:var(--ink);
}
h2 b{font-weight:500;color:var(--gold-deep)}
h2 em{font-style:italic;font-weight:300;color:var(--gold-deep)}
h3{font-family:var(--font-display);font-weight:400;font-size:var(--fs-h3);letter-spacing:-.01em;line-height:1.05;color:var(--ink)}
h4{font-family:var(--font-display);font-weight:400;font-size:var(--fs-h4);letter-spacing:-.01em;color:var(--ink)}

p{text-wrap:pretty}
.lead{font-size:var(--fs-lead);color:var(--ink-soft);max-width:56ch}

/* eyebrow / section tag / telemetria mono */
.eyebrow{
  display:inline-flex;align-items:center;gap:12px;
  font-family:var(--font-mono);font-size:var(--fs-meta);letter-spacing:.24em;text-transform:uppercase;
  color:var(--ink-soft);
}
.eyebrow::before{content:"";width:34px;height:1px;background:var(--gold-deep)}

.section-tag{
  font-family:var(--font-mono);font-size:var(--fs-meta);letter-spacing:.2em;text-transform:uppercase;
  color:var(--gold-deep);display:flex;align-items:center;gap:14px;
}
.section-tag .num{font-family:var(--font-display);font-style:italic;color:var(--ink-faint);font-size:14px}

/* telemetria: la firma mono con tabular-nums (es. MATERIAL · OPTICAL GLASS · IOR 1.5 · φ 137.5°) */
.telemetry,.meta{
  font-family:var(--font-mono);font-size:var(--fs-meta);letter-spacing:.18em;text-transform:uppercase;
  color:var(--ink-faint);font-variant-numeric:tabular-nums;
}
.telemetry .dot{color:var(--gold-deep)}

/* =============================== LAYOUT =================================== */
.wrap{max-width:var(--maxw);margin:0 auto;padding:0 var(--gutter)}
section{position:relative;z-index:10}
.section{padding:var(--sp-section) 0}
.section--line{border-top:1px solid var(--line)}

/* le sezioni di contenuto sono "fogli" caldi su cui leggere: il canvas resta
   visibile attorno/sotto, ma il testo vive su una zona calma e nitida. */
.sheet{
  background:rgba(250,247,240,.72);
  backdrop-filter:saturate(115%) blur(6px);
  -webkit-backdrop-filter:saturate(115%) blur(6px);
  border:1px solid var(--line-soft);
  border-radius:var(--r-soft);
}

/* griglia editoriale asimmetrica riutilizzabile */
.grid-asym{display:grid;grid-template-columns:1fr;gap:clamp(40px,6vw,90px)}
@media(min-width:920px){ .grid-asym{grid-template-columns:.82fr 1.18fr;align-items:start} }

/* =================== HERO: SCROLL-HINT condiviso ========================= */
.scroll-hint{
  position:absolute;z-index:10;right:var(--gutter);bottom:clamp(34px,8vh,84px);
  font-family:var(--font-mono);font-size:10.5px;letter-spacing:.22em;text-transform:uppercase;color:var(--ink-soft);
  writing-mode:vertical-rl;display:flex;align-items:center;gap:14px;
}
.scroll-hint::after{content:"";width:1px;height:54px;background:linear-gradient(var(--gold-deep),transparent);animation:trickle 2.6s var(--ease-soft) infinite}
@keyframes trickle{0%{transform:scaleY(0);transform-origin:top}50%{transform:scaleY(1);transform-origin:top}51%{transform-origin:bottom}100%{transform:scaleY(0);transform-origin:bottom}}
@media(max-width:680px){ .scroll-hint{display:none} }

/* =============================== BOTTONI ================================== */
.cta{
  position:relative;display:inline-flex;align-items:center;gap:12px;
  font-family:var(--font-mono);font-size:13px;letter-spacing:.08em;text-transform:uppercase;
  color:var(--paper);background:var(--ink);
  padding:15px 26px;border-radius:var(--r-cut);will-change:transform;
  transition:background var(--d-fast) var(--ease-out),color var(--d-fast) var(--ease-out);
}
.cta:hover{background:var(--gold-deep)}
.cta:active{transform:scale(.96)}
.cta .arrow{transition:transform var(--d-norm) var(--ease-glass)}
.cta:hover .arrow{transform:translateX(5px)}

/* CTA finale: l'unico shock cromatico caldo, oro pieno */
.cta--gold{
  background:linear-gradient(120deg,var(--gold),var(--gold-deep));
  color:#2A1C06;box-shadow:0 8px 30px -10px rgba(200,146,46,.6);
}
.cta--gold:hover{background:linear-gradient(120deg,var(--gold-deep),var(--gold));color:#2A1C06}

.cta--ghost{
  background:transparent;color:var(--ink);
  box-shadow:inset 0 0 0 1px var(--line-strong);
}
.cta--ghost:hover{background:transparent;color:var(--gold-deep);box-shadow:inset 0 0 0 1px var(--gold-deep)}

.link-quiet{
  font-family:var(--font-mono);font-size:12.5px;letter-spacing:.1em;text-transform:uppercase;color:var(--ink-soft);
  border-bottom:1px solid transparent;padding-bottom:3px;
  transition:color var(--d-fast) var(--ease-out),border-color var(--d-fast) var(--ease-out);
}
.link-quiet:hover{color:var(--ink);border-color:var(--line-strong)}

/* =============================== FOOTER ================================== */
footer.site-footer{
  background:var(--paper-deep);border-top:1px solid var(--line);
  padding:var(--sp-6) 0 var(--sp-4);position:relative;z-index:10;
}
.footer-grid{display:grid;grid-template-columns:1fr;gap:clamp(36px,5vw,64px);align-items:start}
@media(min-width:760px){ .footer-grid{grid-template-columns:1.4fr .8fr .8fr} }
.footer-brand .fw{font-family:var(--font-display);font-size:28px;letter-spacing:.36em;padding-left:.36em;display:block;color:var(--ink)}
.footer-brand p{margin-top:var(--sp-2);color:var(--ink-soft);font-size:var(--fs-small);max-width:36ch}
.footer-col h5{font-family:var(--font-mono);font-size:var(--fs-meta);letter-spacing:.18em;text-transform:uppercase;color:var(--ink-faint);margin-bottom:var(--sp-2)}
.footer-col a{display:block;color:var(--ink-soft);font-size:var(--fs-small);padding:5px 0;transition:color var(--d-fast) var(--ease-out)}
.footer-col a:hover{color:var(--gold-deep)}
.footer-bottom{
  display:flex;justify-content:space-between;align-items:center;gap:18px;flex-wrap:wrap;
  margin-top:var(--sp-5);padding-top:var(--sp-3);border-top:1px solid var(--line);
}

/* =============================== UTILITY ================================== */
.u-gold{color:var(--gold-deep)}
.u-dim{color:var(--ink-soft)}
.u-mono{font-family:var(--font-mono)}
.u-center{text-align:center}
.u-tabnum{font-variant-numeric:tabular-nums}
.divider{height:1px;background:var(--line);border:0;margin:0}

/* reveal allo scroll: stato iniziale (lo sblocca shared.js o reduced-motion) */
[data-reveal]{opacity:0;transform:translateY(28px)}
.is-ready [data-reveal]{transition:opacity var(--d-slow) var(--ease-glass),transform var(--d-slow) var(--ease-glass)}

/* cursore custom (opzionale, attivato da shared.js solo su dispositivi a puntatore fine) */
.has-cursor *{cursor:none}
#helix-cursor{
  position:fixed;top:0;left:0;z-index:300;pointer-events:none;
  width:30px;height:30px;margin:-15px 0 0 -15px;border-radius:50%;
  border:1px solid var(--gold-deep);mix-blend-mode:multiply;
  transition:width var(--d-fast) var(--ease-out),height var(--d-fast) var(--ease-out),opacity var(--d-fast);
  will-change:transform;opacity:0;
}
#helix-cursor.is-live{opacity:1}
#helix-cursor.is-hot{width:54px;height:54px;margin:-27px 0 0 -27px;border-color:var(--gold)}

/* =========================== VIEW TRANSITIONS ============================ */
::view-transition-old(root){animation:vt-out .35s var(--ease-soft) both}
::view-transition-new(root){animation:vt-in .6s var(--ease-glass) both}
@keyframes vt-out{to{opacity:0;transform:translateY(-1.2%) scale(.994)}}
@keyframes vt-in{from{opacity:0;transform:translateY(1.2%) scale(1.004)}}

/* =========================== REDUCED MOTION ============================== */
@media(prefers-reduced-motion:reduce){
  *{animation:none!important;transition-duration:.001s!important;scroll-behavior:auto!important}
  [data-reveal]{opacity:1!important;transform:none!important}
  h1 .line > span{transform:none!important}
  ::view-transition-old(root),::view-transition-new(root){animation:none!important}
  .curtain{opacity:0!important;pointer-events:none!important}
  #helix-cursor{display:none!important}
  .has-cursor *{cursor:auto!important}
}