/* =====================================================================
   FF Theme · home (solo in prima pagina, dopo guscio.css)
   Dal concept pagine/federicofloris-home-concept.html: scene a tutto schermo, oggetto narrativo nel canvas,
   titoli su due righe (calcolati dal JS), entrate animate nello scroll a scene, lista lavori/mockup,
   dettaglio progetto con loader. Gli elementi comuni delle scene (titoli, occhiello, testo, azioni, contatti,
   scheda del disegno su mobile) sono in scene.css, caricato prima di questo file.
   Desktop: scroll a scene (html.ff-locked), testo a sinistra, disegno a destra.
   Mobile (< 900 px): scroll naturale, ogni scena ha la sua scheda con il disegno in alto e il testo sotto.
   ===================================================================== */

/* scroll a scene (desktop): ogni scena si aggancia in cima */
html.ff-locked{scroll-snap-type:y mandatory}

/* ===== Scene ===== */
.ff-scene{
  position:relative;min-height:100vh;min-height:100svh;scroll-snap-align:start;
  display:flex;flex-direction:column;justify-content:center;
  padding-block:calc(var(--ff-head) + clamp(16px,4.5vh,52px)) calc(var(--ff-barh) + clamp(16px,4.5vh,52px));
  padding-left:var(--ff-pad-l);padding-right:var(--ff-pad-r);
}
/* desktop: le scene NON hanno colori propri, seguono il tono del body che sfuma al cambio di scena
   (base.css darebbe a ogni [data-tone] i suoi token: qui si ereditano da body) */
@media (min-width:900px){
  .ff-home .ff-scene[data-tone]{--bg:inherit;--surface:inherit;--fg:inherit;--muted:inherit;--line:inherit;--accent:inherit;color-scheme:inherit}
}
/* la prima scena ha il testo un po' più largo (elementi comuni delle scene: scene.css) */
.ff-scene:first-child .ff-in{max-width:min(50rem,47vw)}

/* lettura tecnica sotto il disegno (desktop): posizione e larghezza le calcola il JS */
.ff-readout{position:fixed;z-index:2;left:var(--ff-ox,60vw);top:var(--ff-oy-end,80vh);margin:14px 0 0;color:var(--muted);pointer-events:none;white-space:nowrap;max-width:var(--ff-ow,40vw);overflow:hidden;text-overflow:ellipsis}

/* linea di avanzamento: in home avanza a scatti, una scena alla volta */
.ff-home .ff-progress i{transition:width var(--ff-t-scene) var(--ff-ease-io)}

/* ===== Entrate animate (solo nello scroll a scene), da uno stato già leggibile =====
   --i = posizione dell'elemento nella scena (lo scrive il JS): gli elementi entrano uno dopo l'altro */
.ff-js .ff-scene .ff-in>*{transition:opacity var(--ff-t-scene) var(--ff-ease-out),transform var(--ff-t-scene) var(--ff-ease-out);transition-delay:calc(var(--i,0)*70ms)}
.ff-locked .ff-scene:not(.is-active) .ff-in>*{opacity:.16;transform:translateY(14px)}

/* ===== Scena 02: «Da dove partiamo?» ===== */
.ff-choose{display:grid;gap:12px;margin:0;padding:0;border:0;min-width:0}
.ff-choose legend{padding:0;margin-bottom:10px;color:var(--muted)}
.ff-answer{display:grid;gap:14px;max-width:40rem}
.ff-answer p{margin:0}

/* ===== Scena 06: lavori e mockup ===== */
.ff-scene--work .ff-in{gap:clamp(10px,2vh,16px);align-content:start}
.ff-works{list-style:none;margin:0;padding:0;display:grid;grid-template-columns:repeat(2,minmax(0,1fr));column-gap:28px;border-top:1px solid var(--line);transition:opacity 180ms var(--ff-ease-out)}
.ff-works:empty{display:none}
.ff-works.is-swap{opacity:0}
.ff-works li{border-bottom:1px solid var(--line);min-width:0}
.ff-works button{width:100%;display:flex;align-items:baseline;gap:12px;background:none;border:0;padding:clamp(3px,.75vh,6px) 0;cursor:pointer;text-align:left;transition:padding var(--ff-t-mid) var(--ff-ease-out),color var(--ff-t-fast)}
.ff-works button small{font:400 .7rem/1 var(--ff-mono);color:var(--muted);font-variant-numeric:tabular-nums}
.ff-works button span{font-size:clamp(.88rem,1.9vh,.98rem);font-weight:500;overflow:hidden;text-overflow:ellipsis;white-space:nowrap;min-width:0}
.ff-works button:hover,.ff-works button:focus-visible{padding-left:8px;color:var(--accent)}
/* voce mockup: nome + settore allineato a destra */
.ff-works button em{margin-left:auto;padding-left:10px;font:400 .66rem/1 var(--ff-mono);font-style:normal;letter-spacing:.05em;text-transform:uppercase;color:var(--muted);white-space:nowrap;overflow:hidden;text-overflow:ellipsis;min-width:0}
/* lista corta: 8 voci su desktop (4 righe da 2), 6 su mobile; il resto con «Mostra tutti» */
.ff-works.is-short li:nth-child(n+9){display:none}
.ff-works-foot{display:flex;flex-wrap:wrap;gap:12px 28px;align-items:center}
.ff-more{background:none;border:0;border-bottom:1px solid var(--accent);border-radius:0;padding:0 0 2px;cursor:pointer;font:inherit;font-weight:600;color:inherit}
.ff-more:hover{color:var(--accent)}
.ff-more small{font:400 .72rem/1 var(--ff-mono);color:var(--muted);margin-left:2px}
/* la riga dei link in fondo segue le altre righe orizzontali delle scene (una riga, scorre se non ci sta) */
.ff-works-foot{flex-wrap:nowrap;overflow-x:auto;overflow-y:hidden;overscroll-behavior-x:contain;scroll-snap-type:x proximity;padding:3px;margin-inline:-3px;scrollbar-width:none}
.ff-works-foot>*{flex:none;scroll-snap-align:start;white-space:nowrap}
.ff-works-foot::-webkit-scrollbar{display:none}
.ff-works-foot.ff-ovf{
  -webkit-mask-image:linear-gradient(90deg,transparent 0,#000 var(--fl,0px),#000 calc(100% - var(--fr,36px)),transparent 100%);
  mask-image:linear-gradient(90deg,transparent 0,#000 var(--fl,0px),#000 calc(100% - var(--fr,36px)),transparent 100%);
}

/* ===== Dettaglio progetto: foglio a tutto schermo che sale dal basso (sotto l'header, sopra la barra) ===== */
.ff-sheet{position:fixed;inset:calc(var(--ff-head) + env(safe-area-inset-top,0px)) 0 0 0;z-index:80;background:var(--surface);color:var(--fg);display:grid;grid-template-rows:auto 1fr;clip-path:inset(100% 0 0 0);visibility:hidden;transition:clip-path 640ms var(--ff-ease-io),visibility 0s 640ms}
.ff-sheet.is-on{clip-path:inset(0);visibility:visible;transition:clip-path 640ms var(--ff-ease-io)}
.ff-sheet-h{display:flex;flex-wrap:wrap;align-items:center;gap:12px 24px;padding:14px var(--ff-gutter-r) 14px var(--ff-gutter);border-bottom:1px solid var(--line)}
.ff-sheet-h h3{margin:0;font-size:clamp(1.4rem,2.6vw,2.4rem);letter-spacing:-.03em;font-weight:600;flex:1;min-width:0;overflow-wrap:anywhere}
.ff-sheet-h .ff-mono{color:var(--muted)}
.ff-sheet-b{position:relative;min-height:0;padding:14px var(--ff-gutter-r) calc(14px + env(safe-area-inset-bottom,0px)) var(--ff-gutter)}
.ff-frame{position:relative;height:100%;border:1px solid var(--line);background:var(--bg);overflow:hidden}
.ff-frame iframe{position:absolute;inset:0;width:100%;height:100%;border:0;background:#fff}
.ff-frame>p{position:absolute;inset:auto 0 0 0;margin:0;padding:10px 16px;font-size:.82rem;color:var(--muted);background:var(--surface);border-top:1px solid var(--line)}

/* ===== Loader dell'anteprima: il sito si «costruisce» mentre carica =====
   wireframe SVG che si disegna, registro con tempi reali, apertura a tendina quando l'iframe ha caricato */
.ff-load{
  position:absolute;inset:0;z-index:2;display:grid;grid-template-columns:minmax(0,1.25fr) minmax(0,1fr);gap:clamp(20px,4vw,64px);align-items:center;
  padding:clamp(20px,4vw,56px);background:var(--bg);
  background-image:linear-gradient(var(--line) 1px,transparent 1px),linear-gradient(90deg,var(--line) 1px,transparent 1px);
  background-size:30px 30px;background-position:-1px -1px;
  clip-path:inset(0 0 0 0);transition:clip-path 700ms var(--ff-ease-io);
}
.ff-load.is-out{clip-path:inset(0 0 100% 0)}
.ff-load svg{width:100%;height:auto;max-height:62vh;overflow:visible}
.ff-load svg .w{fill:none;stroke:var(--fg);stroke-width:1;vector-effect:non-scaling-stroke;stroke-dasharray:1;stroke-dashoffset:1;animation:ff-draw 900ms var(--ff-ease-out) forwards;animation-delay:calc(var(--d,0)*90ms)}
.ff-load svg .h{fill:url(#ff-hatch);opacity:0;transition:opacity 420ms var(--ff-ease-out)}
.ff-load svg .dot{fill:var(--muted)}
.ff-load[data-stage="2"] .h1,.ff-load[data-stage="3"] .h1,.ff-load[data-stage="4"] .h1,.ff-load[data-stage="5"] .h1,.ff-load[data-stage="6"] .h1{opacity:1}
.ff-load[data-stage="3"] .h2,.ff-load[data-stage="4"] .h2,.ff-load[data-stage="5"] .h2,.ff-load[data-stage="6"] .h2{opacity:1}
.ff-load[data-stage="4"] .h3,.ff-load[data-stage="5"] .h3,.ff-load[data-stage="6"] .h3{opacity:1}
.ff-load[data-stage="5"] .h4,.ff-load[data-stage="6"] .h4{opacity:1}
.ff-load.is-done svg .w{stroke:var(--accent);transition:stroke 300ms}
.ff-load-side{display:grid;gap:18px;min-width:0}
.ff-load-k{margin:0;color:var(--muted)}
.ff-load-t{font-size:clamp(1.8rem,3.6vw,3.4rem);font-weight:600;letter-spacing:-.035em;line-height:1;margin:0;overflow-wrap:anywhere}
.ff-load-time{font:500 clamp(1.1rem,1.6vw,1.4rem)/1 var(--ff-mono);font-variant-numeric:tabular-nums;color:var(--accent)}
.ff-log{list-style:none;margin:0;padding:0;display:grid;gap:7px;color:var(--muted);font:400 .78rem/1.3 var(--ff-mono)}
.ff-log li{display:flex;gap:12px;animation:ff-in 260ms var(--ff-ease-out) both}
.ff-log li b{font-weight:400;color:var(--fg);min-width:4.6em;font-variant-numeric:tabular-nums}
.ff-log li.ok b{color:var(--accent)}
.ff-load-fail{display:grid;gap:12px;justify-items:start}
.ff-load-fail p{margin:0;max-width:36ch}
/* «Mostra l'anteprima»: si apre al clic o da sola quando la barra interna arriva in fondo */
.ff-load-go{position:relative;overflow:hidden;justify-self:start;animation:ff-in 260ms var(--ff-ease-out) both}
.ff-load-go i{position:absolute;left:0;bottom:0;height:3px;width:0;background:currentColor;opacity:.55;animation:ff-count var(--ff-auto,2400ms) linear forwards}
@keyframes ff-count{to{width:100%}}
@keyframes ff-draw{to{stroke-dashoffset:0}}

/* ===== Desktop basso (portatili): meno testo secondario, controlli più compatti ===== */
@media (min-width:900px) and (max-height:760px){
  .ff-opt{display:none}
  .ff-scene .ff-btn{height:38px}
  .ff-tags li{padding:6px 9px}
  .ff-choose legend{margin-bottom:6px}
  .ff-scene .ff-opts span{padding:8px 12px;font-size:.9rem}
  .ff-scene--work .ff-eyebrow{display:none}
  .ff-switch button{padding:6px 12px}
}

/* ===== Tablet e mobile: scroll naturale, il disegno ha il suo spazio in ogni scena ===== */
@media (max-width:899px){
  .ff-readout{display:none}
  .ff-in,.ff-scene:first-child .ff-in,.ff-scene--work .ff-in{max-width:100%}
  /* scheda del disegno in alto, testo ancorato in basso: lo spazio libero resta in mezzo */
  .ff-scene{justify-content:space-between;padding-block:calc(var(--ff-head) + 14px) calc(var(--ff-barh) + 40px)}
  /* ogni scena ha il suo sfondo (token da base.css): il confine scuro/chiaro scorre con il dito come una vera sezione */
  .ff-scene{background:var(--bg);color:var(--fg)}
  /* il canvas sta sopra la pagina ma disegna solo dentro la scheda della scena */
  #ff-obj{z-index:2}
  /* le righe orizzontali arrivano fino ai bordi dello schermo */
  .ff-works-foot{margin-inline:calc(-1 * var(--ff-gutter));padding-inline:var(--ff-gutter);scroll-padding-inline:var(--ff-gutter)}
  /* lavori: 6 voci, poi «Mostra tutti» */
  .ff-works.is-short li:nth-child(n+7){display:none}
  .ff-load{grid-template-columns:1fr;align-content:center}
  .ff-load svg{max-height:34vh}
}
/* tablet: risposta della scena 02 larga quanto i paragrafi (circa 70 caratteri per riga) */
@media (min-width:600px) and (max-width:899px){
  .ff-answer{max-width:70ch}
}
@media (max-width:520px){
  .ff-works{grid-template-columns:1fr}
  .ff-sheet-h h3{flex-basis:100%;order:-1}
}
@media (prefers-reduced-motion:reduce){
  html.ff-locked{scroll-snap-type:none}
}