:root{
  --bg:#07090b;
  --fg:#ece9e3;
  --muted:#8c9299;
  --dimtext:#b3b8bd;
  --line:rgba(255,255,255,.11);
  --accent:#d78b4c;
  --card:rgba(10,13,16,.66);
  --sans:'Inter Tight',system-ui,-apple-system,'Segoe UI',sans-serif;
  --serif:'Instrument Serif',Georgia,serif;
  --mono:'IBM Plex Mono',ui-monospace,'SF Mono',Menlo,monospace;
  --ease:cubic-bezier(.16,.84,.24,1);
}

*{box-sizing:border-box;margin:0;padding:0}
html{scroll-behavior:smooth;-webkit-text-size-adjust:100%}
body{
  background:var(--bg);color:var(--fg);font-family:var(--sans);font-weight:300;
  line-height:1.62;overflow-x:hidden;-webkit-font-smoothing:antialiased;
}
body.loading{overflow:hidden}
body::before{
  content:'';position:fixed;inset:0;z-index:0;pointer-events:none;
  background:radial-gradient(58% 46% at 66% 42%,rgba(215,139,76,.13),transparent 72%),
             radial-gradient(72% 62% at 14% 88%,rgba(58,92,134,.13),transparent 72%);
}
::selection{background:var(--accent);color:#0b0d10}
/* `all:unset` sui bottoni cancella anche l'outline: lo rimettiamo esplicitamente */
:focus-visible{outline:2px solid var(--accent);outline-offset:3px;border-radius:2px}

/* ---------------------------------------------------------------- 3D */
#scene{position:fixed;inset:0;width:100%;height:100%;z-index:1;display:block}
#vignette{position:fixed;inset:0;z-index:3;pointer-events:none;box-shadow:inset 0 0 20vw 5vw rgba(0,0,0,.7)}
#grain{
  position:fixed;inset:-50%;z-index:2;pointer-events:none;opacity:.05;
  background-image:url("data:image/svg+xml,%3Csvg xmlns='http://www.w3.org/2000/svg' width='140' height='140'%3E%3Cfilter id='n'%3E%3CfeTurbulence type='fractalNoise' baseFrequency='.85' numOctaves='3'/%3E%3C/filter%3E%3Crect width='140' height='140' filter='url(%23n)'/%3E%3C/svg%3E");
}

/* ------------------------------------------------------------ loader */
#loader{
  position:fixed;inset:0;z-index:100;display:grid;place-content:center;justify-items:center;gap:2rem;
  background:var(--bg);transition:opacity .9s var(--ease),visibility .9s;
}
#loader.done{opacity:0;visibility:hidden}
.loader-mark{font-family:var(--serif);font-size:clamp(3rem,9vw,5.5rem);letter-spacing:-.02em;line-height:1}
.loader-mark span{color:var(--accent);margin:0 .1em}
#loader .bar{width:min(60vw,240px);height:1px;background:var(--line);overflow:hidden}
#loader .bar i{display:block;height:100%;width:0;background:var(--accent);transition:width .25s linear}
#loader p{font-family:var(--mono);font-size:.68rem;letter-spacing:.18em;text-transform:uppercase;color:var(--muted)}

/* ------------------------------------------------------------- chrome */
.topbar{
  position:fixed;top:0;left:0;right:0;z-index:30;display:flex;justify-content:space-between;
  align-items:center;gap:1rem;padding:1.35rem clamp(1.1rem,4vw,3.2rem);
  background:linear-gradient(rgba(7,9,11,.75),transparent);
}
.wordmark{font-size:.88rem;font-weight:500;letter-spacing:-.01em;color:var(--fg);text-decoration:none}
.topnav{display:flex;gap:1.5rem}
.topnav a{
  font-family:var(--mono);font-size:.64rem;letter-spacing:.15em;text-transform:uppercase;
  color:var(--muted);text-decoration:none;transition:color .25s;
}
.topnav a:hover{color:var(--accent)}

#rail{position:fixed;right:clamp(.7rem,2vw,1.7rem);top:50%;transform:translateY(-50%);z-index:30;
  display:flex;flex-direction:column;gap:.5rem;opacity:0;transition:opacity .5s}
#rail.on{opacity:1}
#rail button{all:unset;cursor:pointer;display:flex;align-items:center;gap:.5rem;justify-content:flex-end;
  font-family:var(--mono);font-size:.58rem;color:transparent;transition:color .25s;
  padding:.45rem 0;min-height:22px}
#rail button::after{content:'';width:12px;height:1px;background:var(--line);transition:.35s var(--ease)}
#rail button:hover{color:var(--muted)}
#rail button[aria-current="true"]{color:var(--accent)}
#rail button[aria-current="true"]::after{width:26px;background:var(--accent)}

#hud{
  position:fixed;left:clamp(1.1rem,4vw,3.2rem);bottom:1.5rem;z-index:30;display:flex;align-items:baseline;
  gap:.6rem;font-family:var(--mono);font-size:.66rem;letter-spacing:.14em;text-transform:uppercase;
  color:var(--muted);opacity:0;transition:opacity .45s;
}
#hud.on{opacity:1}
#hud span:first-child{color:var(--accent)}

/* ----------------------------------------------------------- sezioni */
main{position:relative;z-index:10}
section{min-height:100svh;display:grid;align-items:center;padding:7rem clamp(1.1rem,4vw,3.2rem) 6rem;pointer-events:none}
section>*{pointer-events:auto}
.wrap{width:100%;max-width:78rem;margin:0 auto}

.kicker{font-family:var(--mono);font-size:.64rem;letter-spacing:.2em;text-transform:uppercase;color:var(--accent);margin-bottom:2rem}
.eyebrow{font-family:var(--mono);font-size:.64rem;letter-spacing:.2em;text-transform:uppercase;color:var(--accent);margin-bottom:1.7rem}

/* rivelazione a cascata */
.reveal>*,.reveal [style]{
  opacity:0;transform:translateY(22px);
  transition:opacity .9s var(--ease),transform .9s var(--ease);
  transition-delay:calc(var(--i,0)*75ms);
}
.reveal.in>*,.reveal.in [style]{opacity:1;transform:none}

/* --------------------------------------------------------------- hero */
.hero{align-content:center;justify-items:start}
.hero-copy{max-width:min(46vw,34rem)}
h1{font-size:clamp(2.7rem,5.6vw,5.2rem);line-height:.98;font-weight:500;letter-spacing:-.04em;text-wrap:balance}
h1 em{font-family:var(--serif);font-style:italic;font-weight:400;color:var(--accent);letter-spacing:-.01em}
.lede{margin-top:1.9rem;max-width:34ch;font-size:clamp(.98rem,1.15vw,1.12rem);color:var(--dimtext)}
.hero-cta{display:flex;flex-wrap:wrap;gap:.7rem;margin-top:2.3rem}
.btn{
  font-family:var(--mono);font-size:.66rem;letter-spacing:.14em;text-transform:uppercase;text-decoration:none;
  color:#0b0d10;background:var(--accent);padding:.85rem 1.4rem;border:1px solid var(--accent);
  border-radius:2px;transition:.3s var(--ease);
}
.btn:hover{background:transparent;color:var(--accent)}
.btn.ghost{background:transparent;color:var(--fg);border-color:var(--line)}
.btn.ghost:hover{border-color:var(--fg)}
.scrollcue{margin-top:3.4rem;font-family:var(--mono);font-size:.62rem;letter-spacing:.26em;text-transform:uppercase;color:var(--muted)}
.scrollcue::before{content:'';display:inline-block;width:34px;height:1px;background:var(--muted);vertical-align:middle;margin-right:.7rem;animation:slide 2.4s var(--ease) infinite}
@keyframes slide{0%,100%{transform:scaleX(.4);transform-origin:left}50%{transform:scaleX(1);transform-origin:left}}

/* ---------------------------------------------------------- manifesto */
/* velo scuro sotto al testo: verticale dove il contenuto è largo,
   orizzontale dove il testo sta a sinistra e il modello deve restare visibile */
.numbers,.index-section,.specs-section{
  background:linear-gradient(rgba(7,9,11,0),rgba(7,9,11,.5) 12%,rgba(7,9,11,.9) 30%,rgba(7,9,11,.92) 88%,rgba(7,9,11,0));
}
.manifesto,.how,.chapter,.contact{
  background:linear-gradient(100deg,rgba(7,9,11,.95) 0%,rgba(7,9,11,.9) 40%,rgba(7,9,11,.4) 70%,rgba(7,9,11,0) 92%);
}
.big{font-size:clamp(1.5rem,3.1vw,2.6rem);line-height:1.24;letter-spacing:-.025em;font-weight:300;max-width:24ch;text-wrap:balance}
.big em{font-family:var(--serif);font-style:italic;color:var(--accent)}
.cols{display:grid;grid-template-columns:repeat(auto-fit,minmax(19rem,1fr));gap:2rem 3.2rem;margin-top:3rem;max-width:62rem}
.cols p{color:var(--dimtext);font-size:1rem}
.cols strong{color:var(--fg);font-weight:500}

/* ------------------------------------------------------------- numeri */
.grid-numbers{list-style:none;display:grid;grid-template-columns:repeat(auto-fit,minmax(13rem,1fr));gap:1px;background:var(--line);border:1px solid var(--line)}
.grid-numbers li{background:rgba(7,9,11,.72);padding:2rem 1.6rem 1.7rem;display:flex;flex-direction:column;gap:.15rem}
.grid-numbers b{font-size:clamp(2.6rem,5vw,4.2rem);font-weight:400;letter-spacing:-.045em;line-height:1;font-variant-numeric:tabular-nums}
.grid-numbers .unit{font-family:var(--mono);font-size:.72rem;color:var(--accent);letter-spacing:.1em;margin-top:.5rem}
.grid-numbers em{font-family:var(--mono);font-style:normal;font-size:.63rem;letter-spacing:.13em;text-transform:uppercase;color:var(--muted);margin-top:.7rem}
.grid-numbers.small{margin-top:1px}
.grid-numbers.small b{font-size:clamp(1.5rem,2.6vw,2.1rem)}
.grid-numbers.small li{padding:1.3rem 1.6rem}

/* ------------------------------------------------------ come funziona */
.how-grid{display:grid;grid-template-columns:repeat(auto-fit,minmax(17rem,1fr));gap:2.5rem;max-width:68rem}
.how-grid article{border-top:1px solid var(--line);padding-top:1.4rem}
.how-grid h3{font-size:1.25rem;font-weight:500;letter-spacing:-.02em;margin-bottom:.7rem}
.how-grid p{color:var(--dimtext);font-size:.96rem}

/* ---------------------------------------------------- capitolo/parti */
.chapter-title{font-size:clamp(2rem,4.2vw,3.6rem);line-height:1.04;font-weight:500;letter-spacing:-.035em}
.chapter-lede{margin-top:1.6rem;max-width:40ch;color:var(--dimtext);font-size:1.05rem}

.part{align-content:center;justify-items:start}
.card{
  max-width:30rem;padding:2.1rem 2.2rem 2.3rem;background:var(--card);
  backdrop-filter:blur(16px) saturate(125%);-webkit-backdrop-filter:blur(16px) saturate(125%);
  border:1px solid var(--line);border-left:2px solid var(--accent);border-radius:2px;
  box-shadow:0 40px 90px -50px rgba(0,0,0,.95);
  opacity:0;transform:translateY(26px);transition:opacity .85s var(--ease),transform .85s var(--ease);
}
.part.in .card{opacity:1;transform:none}
.card .num{font-family:var(--mono);font-size:.7rem;letter-spacing:.22em;color:var(--accent);margin-bottom:.9rem}
.card h2{font-size:clamp(1.55rem,2.5vw,2.1rem);font-weight:500;letter-spacing:-.03em;line-height:1.08;margin-bottom:1.05rem;text-wrap:balance}
.card p{color:var(--dimtext);font-size:.97rem}
.card p+p{margin-top:.8rem}
.chips{list-style:none;display:flex;flex-wrap:wrap;gap:.4rem;margin-top:1.6rem}
.chips li{font-family:var(--mono);font-size:.66rem;color:var(--muted);border:1px solid var(--line);border-radius:999px;padding:.33rem .72rem;white-space:nowrap}
.chips b{color:var(--fg);font-weight:500}

/* ------------------------------------------------------------- indice */
.index-list{list-style:none;counter-reset:c;columns:21rem;column-gap:3.2rem;margin-top:3rem}
.index-list li{counter-increment:c;display:flex;align-items:baseline;gap:.8rem;padding:.85rem 0;
  border-bottom:1px solid var(--line);break-inside:avoid}
.index-list li::before{content:counter(c,decimal-leading-zero);font-family:var(--mono);font-size:.62rem;color:var(--accent);min-width:1.6rem}
.index-list span{flex:1;font-size:.98rem}
.index-list em{font-family:var(--mono);font-style:normal;font-size:.68rem;color:var(--muted);white-space:nowrap}
.note{margin-top:2rem;font-family:var(--mono);font-size:.64rem;letter-spacing:.06em;color:var(--muted);max-width:60ch;line-height:1.9}

/* --------------------------------------------------------- specifiche */
.specs{display:grid;grid-template-columns:repeat(auto-fit,minmax(11rem,1fr));gap:1px;background:var(--line);border:1px solid var(--line)}
.specs>div{background:rgba(7,9,11,.72);padding:1.1rem 1.2rem}
.specs dt{font-family:var(--mono);font-size:.58rem;letter-spacing:.15em;text-transform:uppercase;color:var(--muted)}
.specs dd{font-size:1.05rem;margin-top:.35rem;letter-spacing:-.015em}
.free-block{margin-top:2.6rem}
#free-btn{
  all:unset;cursor:pointer;font-family:var(--mono);font-size:.68rem;letter-spacing:.14em;text-transform:uppercase;
  color:var(--fg);border:1px solid var(--line);padding:.85rem 1.5rem;border-radius:2px;transition:.3s var(--ease);
}
#free-btn:hover{border-color:var(--accent);color:var(--accent)}
.hint{margin-top:.9rem;font-family:var(--mono);font-size:.62rem;color:var(--muted)}
.hint kbd{border:1px solid var(--line);border-radius:3px;padding:.05rem .35rem}

/* ----------------------------------------------------------- contatti */
.contact-title{font-size:clamp(2.1rem,5vw,4.2rem);line-height:1.02;font-weight:500;letter-spacing:-.04em}
.contact-title em{font-family:var(--serif);font-style:italic;color:var(--accent);font-weight:400}
.contact-lede{margin-top:1.7rem;max-width:46ch;color:var(--dimtext);font-size:1.02rem}
.mailto{
  display:inline-block;margin-top:2.6rem;font-size:clamp(1.2rem,3.1vw,2.4rem);letter-spacing:-.03em;
  color:var(--fg);text-decoration:none;padding-bottom:.35rem;transition:.35s var(--ease);
  background:linear-gradient(var(--accent),var(--accent)) no-repeat left bottom/0 1px;
}
.mailto:hover{color:var(--accent);background-size:100% 1px}
.contact-meta{list-style:none;display:flex;flex-wrap:wrap;gap:.5rem 2rem;margin-top:2.6rem;
  font-family:var(--mono);font-size:.63rem;letter-spacing:.13em;text-transform:uppercase;color:var(--muted)}

/* ---------------------------------------------------- modalità libera */
body.free main,body.free #rail,body.free #hud,body.free .topbar{opacity:0;pointer-events:none;transition:opacity .45s}
body.free{overflow:hidden}
#free-exit{
  position:fixed;z-index:40;left:50%;bottom:2rem;transform:translateX(-50%);display:none;
  font-family:var(--mono);font-size:.63rem;letter-spacing:.14em;text-transform:uppercase;color:var(--muted);
  border:1px solid var(--line);background:var(--card);backdrop-filter:blur(10px);
  padding:.65rem 1.2rem;border-radius:2px;cursor:pointer;
}
body.free #free-exit{display:block}

footer{position:relative;z-index:10;padding:3rem clamp(1.1rem,4vw,3.2rem) 4rem;background:var(--bg);
  border-top:1px solid var(--line);font-family:var(--mono);font-size:.64rem;letter-spacing:.06em;color:var(--muted)}
.fallback{position:relative;z-index:50;display:grid;place-items:center;gap:1rem;padding:20vh 2rem;text-align:center}
.fallback img{max-width:min(80vw,420px)}
.mono{font-family:var(--mono)}

/* -------------------------------------------------------- responsive */
@media (max-width:900px){
  .topnav{display:none}
  section{align-items:end;padding:6rem 1.1rem 4.5rem}
  .hero{align-content:end}
  .hero-copy{max-width:100%}
  .lede{font-size:1rem}
  .part{justify-items:stretch}
  .card{max-width:100%;padding:1.5rem 1.4rem 1.7rem}
  #rail{display:none}
  .index-list{gap:0}
  .manifesto,.how,.numbers,.chapter,.index-section,.specs-section,.contact{
    background:linear-gradient(rgba(7,9,11,0),rgba(7,9,11,.9) 26%,rgba(7,9,11,.94))}
}

@media (prefers-reduced-motion:reduce){
  html{scroll-behavior:auto}
  .scrollcue::before{animation:none}
  .reveal>*,.reveal [style],.card{transition-duration:.01ms;opacity:1;transform:none}
}