/* FONT */
@font-face {
  font-family: "SF Mono";
  src: url("../fonts/SF-Mono-Light.otf") format("opentype");
  font-weight: 300;
  font-style: normal;
}

@font-face {
  font-family: "SF Mono";
  src: url("../fonts/SF-Mono-Bold.otf") format("opentype");
  font-weight: 700;
  font-style: normal;
}

@import url('https://fonts.googleapis.com/css2?family=Anton&display=swap');

@import url('https://fonts.googleapis.com/css2?family=Barlow:wght@900&display=swap');

:root{
  --bg:#ffffff;
  --fg:#0a0a0a;
  --accent:#000000;
}

*{box-sizing:border-box}
html,body{height:100%;margin:0;font-family:"SF Mono", monospace;background:var(--bg);color:var(--fg)}
.intro{height:100vh;display:flex;flex-direction:column;align-items:center;position:relative;overflow:hidden}

/* blocco centrale (logo + scritta + hint): occupa lo spazio rimasto sopra ai
   contatti e si centra al suo interno, così non può mai sovrapporsi a ciò
   che sta sotto, qualunque sia l'altezza dello schermo */
.intro-hero{
  position:relative;z-index:2;width:100%;
  flex:1 1 auto;min-height:0;
  display:flex;flex-direction:column;align-items:center;justify-content:center;
  padding:24px 24px 12px;
}

/* ===== background photo ===== */
.intro-bg{position:absolute;inset:0;z-index:0;overflow:hidden;will-change:transform;transition:transform 700ms cubic-bezier(.16,1,.3,1)}
.intro-bg-img{
  position:absolute;inset:-4%;
  background-image:url('/media/images/sfondo-intro-web.webp');
  background-size:cover;
  background-position:center 62%;
  filter:grayscale(28%) contrast(1.06) brightness(1.02);
  animation:kenburns 26s ease-in-out infinite alternate;
}
/*@keyframes kenburns{
  0%{transform:scale(1) translate(0,0)}
  100%{transform:scale(1.1) translate(-1.2%,-1%)}
}*/
.intro-vignette{
  position:absolute;inset:0;
  background:
    radial-gradient(ellipse at 50% 42%, rgba(255,255,255,0.92) 0%, rgba(255,255,255,0.62) 28%, rgba(255,255,255,0.18) 52%, rgba(255,255,255,0) 68%),
    linear-gradient(to bottom, rgba(255,255,255,0.35) 0%, rgba(255,255,255,0) 22%, rgba(255,255,255,0) 70%, rgba(0,0,0,0.18) 100%);
}
.intro-grain{
  position:absolute;inset:0;opacity:0.045;mix-blend-mode:multiply;pointer-events:none;
  background-image:url("data:image/svg+xml;utf8,<svg xmlns='http://www.w3.org/2000/svg' width='160' height='160'><filter id='n'><feTurbulence type='fractalNoise' baseFrequency='0.9' numOctaves='2' stitchTiles='stitch'/></filter><rect width='100%25' height='100%25' filter='url(%23n)'/></svg>");
}
.intro.fading .intro-bg{transform:scale(1.04);transition:transform 900ms cubic-bezier(.76,0,.24,1)}

.logo-wrap{position:relative;z-index:2;cursor:pointer;width:220px;display:flex;align-items:center;justify-content:center;transition:transform 400ms ease}
.logo-wrap:hover{transform:scale(1.015)}
.frame{position:relative;display:flex;align-items:center;justify-content:center;width:100%;height:100%;}
.logo-inner-img{
  display:block;width:100%;height:100%;
  object-fit:contain;
  transition:opacity 480ms ease, transform 520ms cubic-bezier(.16,1,.3,1);
}
.divider{width:68px;height:2px;background:var(--accent);margin:0 auto}

/* ===== telaio del logo: un'unica cornice chiusa, con i due tagli centrali
   in alto e in basso, fedele a LOGO.png (non due parentesi separate) ===== */
.logo-frame{
  position:relative;width:220px;height:416px;
  display:flex;align-items:center;justify-content:center;
  animation:frameBreathe 3600ms ease-in-out infinite;
  transform-origin:center;
}
 
@keyframes frameBreathe{
  0%,100%{transform:scale(1)}
  50%{transform:scale(1.018)}
}
.logo-wrap:hover .logo-frame,
.logo-wrap.open .logo-frame{animation:none;transform:scale(1)}

.frame-bar{position:absolute;background:var(--accent)}
/* ogni graffa è UN UNICO blocco rigido (montante + angolo sopra + angolo sotto):
   i tre pezzi non si muovono mai l'uno rispetto all'altro, quindi i loro
   angoli restano sempre saldati. A muoversi è solo il blocco intero. */
.bracket-group{position:absolute;inset:0;transition:transform 550ms cubic-bezier(.16,1,.3,1), opacity 380ms ease}
/* montanti verticali: corrono per tutta l'altezza, sempre continui */
.bar-v{width:18px;height:100%;top:0}
.bar-left{left:0}
.bar-right{right:0}
/* traversine alto/basso: due segmenti con il taglio centrale, come nel marchio */
.bar-h{width:80px;height:18px}
.bar-top-left{top:0;left:18px}
.bar-top-right{top:0;right:18px}
.bar-bottom-left{bottom:0;left:18px}
.bar-bottom-right{bottom:0;right:18px}

/* hover: le due graffe si aprono in modo netto e leggibile, non un fremito impercettibile */
.logo-wrap:hover .bracket-left-group{transform:translateX(-18px)}
.logo-wrap:hover .bracket-right-group{transform:translateX(18px)}

/* click: le due graffe si aprono per intero verso i lati e svaniscono,
   le lettere O/B si dissolvono al centro */
.logo-wrap.open .bracket-left-group{transform:translateX(-90px);opacity:0}
.logo-wrap.open .bracket-right-group{transform:translateX(90px);opacity:0}
.logo-wrap.open .logo-inner-img{opacity:0.06;transform:scale(0.3)}

.typed{position:relative;z-index:2;margin-top:28px;font-size:24px;letter-spacing:8px;min-height:38px}

/* invito all'interazione 
.enter-hint{
  position:relative;z-index:2;margin-top:34px;display:flex;flex-direction:column;align-items:center;gap:10px;
  opacity:0;transform:translateY(6px);transition:opacity 600ms ease,transform 600ms ease;pointer-events:none;
}
.enter-hint.show{opacity:0.85;transform:translateY(0)}
.enter-hint-line{width:1.5px;height:22px;background:var(--accent);animation:hintPulse 2200ms ease-in-out infinite}
.enter-hint-label{font-size:12px;letter-spacing:4px;text-transform:uppercase}
@keyframes hintPulse{
  0%,100%{opacity:0.25;height:14px}
  50%{opacity:0.85;height:26px}
}
.logo-wrap.open ~ .enter-hint{opacity:0!important}
*/
/* contatti in basso nell'intro, come nella carta intestata.
   in flusso normale (non più position:absolute): così non potrà mai
   sovrapporsi all'hint "enter" o al logo, su nessuna altezza di schermo */
.intro-contacts{
  position:relative;z-index:2;flex:0 0 auto;width:100%;
  text-align:center;font-size:11px;letter-spacing:1.5px;line-height:1.8;
  color:#000;opacity:1;padding:0 24px 32px;
}
.intro-contacts .intro-first{font-weight:800; font-size:13px}
.intro.fading .intro-contacts{opacity:0;transition:opacity 300ms ease}

/* tendina di transizione tra le pagine */
.page-curtain{
  position:fixed;inset:0;background:#0a0a0a;z-index:9999;pointer-events:none;
  transform:scaleY(0);transform-origin:bottom;
}
.page-curtain.active{transform:scaleY(1);transition:transform 650ms cubic-bezier(.76,0,.24,1)}

/* tendina in apertura, sulla pagina successiva: continua il gesto dell'intro */
.page-curtain.reveal{
  transform:scaleY(1);transform-origin:top;
  animation:curtainLift 700ms 80ms cubic-bezier(.76,0,.24,1) forwards;
}
@keyframes curtainLift{
  from{transform:scaleY(1)}
  to{transform:scaleY(0)}
}

/* home grid layout */
.home-grid{margin:40px auto}
.cols{display:grid;grid-template-columns:repeat(3,1fr);gap:40px;align-items:start}
.col h3{text-align:center;font-weight:700;letter-spacing:3px;text-transform:lowercase;margin-bottom:20px}
/*.cards{display:flex;flex-direction:column;gap:48px;align-items:center}*/
.cards {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 10em;
}
.card{width:auto;text-align:left}
.thumb{width:auto;background:#eee;border-radius:4px;margin:0 auto 24px;background-size:cover;background-position:center}
.caption .meta{font-size:12px;color:#666;line-height:1.2;margin-top:6px}

.card .thumb {
  width: 100%;
  aspect-ratio: 3/4;
  background-size: cover;
  background-position: center;
  transition: background-size 0.4s ease;
  background-repeat: no-repeat;
}

.card .thumb-link {
  display: block;
  overflow: hidden;
}

.card .title-link{position:relative; font-weight:700}

.card .thumb-link:hover .thumb {
  background-size: 110%;
}


.card .title-link::before,.card .title-link::after{ left:-10px;content:'[';position:absolute;opacity:0;color:var(--accent);transform:translateY(0%);transition:all 240ms}
.card .title-link::after{content:']';right:-10px;left:auto}
.card .title-link:hover::before{opacity:1;animation:slideInLeft 400ms ease-out}
.card .title-link:hover::after{opacity:1;animation:slideInRight 400ms ease-out}
.card .title-link:focus::before{opacity:1;animation:slideInLeft 400ms ease-out}
.card .title-link:focus::after{opacity:1;animation:slideInRight 400ms ease-out}
.card .title-link:focus{outline:none}




/* main view */
.main{display:none;opacity:0;transition:opacity 450ms ease}
.main.visible{display:block;opacity:1}
.site-header{display:flex;align-items:center;justify-content:center;padding:22px 40px;border-bottom:1px solid rgba(0,0,0,0.06)}
.site-header.centered-header{padding-top:28px;padding-bottom:28px}
.brand{font-weight:700;display:none}
.nav{display:flex;gap:48px}
.nav.centered{gap:56px}
.nav-item{position:relative;text-decoration:none;color:var(--fg);padding:8px 4px;font-weight:700;letter-spacing:2px}
@keyframes slideInLeft {
  from {
    opacity: 0;
    transform: translateX(-20px);
  }
  to {
    opacity: 1;
    transform: translateX(0);
  }
}

@keyframes slideInRight {
  from {
    opacity: 0;
    transform: translateX(20px);
  }
  to {
    opacity: 1;
    transform: translateX(0);
  }
}

.nav-item::before,.nav-item::after{ left:-10px;content:'[';position:absolute;opacity:0;color:var(--accent);transform:translateY(0%);transition:all 240ms}
.nav-item::after{content:']';right:-10px;left:auto}
.nav-item:hover::before{opacity:1;animation:slideInLeft 400ms ease-out}
.nav-item:hover::after{opacity:1;animation:slideInRight 400ms ease-out}
.nav-item:focus::before{opacity:1;animation:slideInLeft 400ms ease-out}
.nav-item:focus::after{opacity:1;animation:slideInRight 400ms ease-out}
.nav-item:focus{outline:none}

.content{padding:0px}
.projects-section{margin: 10% 7%}
.projects .grid{display:grid;grid-template-columns:repeat(auto-fit,minmax(200px,1fr));gap:40px}
.project{background:#f5f5f5;padding:24px;border-radius:8px}

/* small animations for letters */
.letter{display:inline-block;opacity:0;transform:translateY(10px);transition:transform 360ms,var(--opacity,opacity) 360ms}
.letter.visible{opacity:1;transform:translateY(0)}

/* responsive */
@media (max-width:480px){
  .logo-wrap{width:160px}
  .logo-frame{width:160px;height:258px}
  .frame{width:104px;padding:16px 0}
 
  .bar-v{width:13px}
  .bar-h{width:58px;height:13px}
  .bar-top-left,.bar-bottom-left{left:13px}
  .bar-top-right,.bar-bottom-right{right:13px}
  .intro-contacts{font-size:9.5px;letter-spacing:1px;bottom:24px}
}

@media (max-width:900px){.cards{grid-template-columns:repeat(2, 1fr)} .cols{grid-template-columns:1fr} .cards{gap:4rem}}
@media (max-width:480px){.cards{gap:2rem}}

/* schermi bassi (landscape sui telefoni, finestre piccole): tutto si stringe
   ma resta in un unico flusso, quindi non si sovrappone mai */
@media (max-height:760px){
  .intro-hero{padding-top:16px;padding-bottom:8px}
  .logo-frame{width:170px;height:258px}
  .frame{width:108px;padding:14px 0}
  .stacked-logo{gap:16px}
  .stacked-letter{font-size:64px}
  .divider{width:50px}
  .bar-v{width:14px}
  .bar-h{width:60px;height:14px}
  .bar-top-left,.bar-bottom-left{left:14px}
  .bar-top-right,.bar-bottom-right{right:14px}
  .typed{margin-top:16px;font-size:18px;letter-spacing:6px;min-height:26px}
  .enter-hint{margin-top:16px}
  .intro-contacts{font-size:9.5px;letter-spacing:1px;line-height:1.6;padding-bottom:18px}
}
@media (max-height:560px){
  .enter-hint{display:none}
  .logo-frame{width:130px;height:246px}
  .frame{width:88px;padding:10px 0}
  .stacked-logo{gap:10px}
  .stacked-letter{font-size:48px}
  .divider{width:38px}
  .typed{margin-top:10px;font-size:15px;letter-spacing:4px;min-height:20px}
  .intro-contacts{font-size:8.5px;padding-bottom:12px}
}


/*header*/ 

header {
  width: 100%;
  position: sticky;
  top: 0;
  left: 0;
  z-index: 1000;
  margin-bottom:0px;
  padding-bottom:0px;
  background-color: #fff;

}

.menu ul {
  list-style: none;
  display: flex;
  justify-content: center;
  align-items: center;
  gap: 15%;
  padding-inline-start: 0px;
}
a {
  all: unset;
  cursor: pointer;
}

@media (max-width:480px){
  .menu ul {gap: 5%;}
}

/*FOOTER*/

.site-footer {
  background: #000;
  color: #fff;
  padding: 40px 7%;
}

.footer-inner {
  max-width: 1400px;
  margin: 0;
  display: flex;
  justify-content: flex-start; /* ← sinistra */
}

.footer-content {
  text-align: left; /* ← testo a sinistra */
  max-width: 500px;
}

.footer-title {
  font-size: 14px;
  margin: 10px 0px 10px 0;
  letter-spacing: 0.08em;
}

.footer-info {
  font-size: 12px;
  line-height: 1.6;
  opacity: 0.75;
}



.thumb {
  position: relative;
  width: 100%;
  aspect-ratio: 3/4;
  overflow: hidden;
}

.thumb-img {
  position: absolute;
  inset: 0;
  background-size: cover;
  background-position: center;
  transition: opacity 2s ease;
}

.thumb-img-1 {
  opacity: 1;
}

.thumb-img-2 {
  opacity: 0;
}

.card:hover .thumb-img-1 {
  opacity: 0;
}

.card:hover .thumb-img-2 {
  opacity: 1;
}

/* =============================================
   STUDIO PAGE
   ============================================= */

/* Hero: due colonne, foto sx, testo dx */
.studio-main{
  max-width:1400px;
  margin:0 auto;
  padding:0 40px 80px;
}

.studio-hero{
  display:grid;
  grid-template-columns:1fr 1fr;
  gap:80px;
  align-items:start;
  padding-top:60px;
}

.studio-hero-img img{
  width:100%;
  height:auto;
  display:block;
  /* leggero filtro in linea col resto del sito */
  filter:grayscale(12%) contrast(1.04);
}

.studio-hero-text{
  padding-top:8px;
}

.studio-label{
  font-size:10px;
  letter-spacing:4px;
  text-transform:uppercase;
  opacity:0.4;
  margin:0 0 32px;
}

.studio-name{
  font-family:"Barlow","Helvetica Neue",Arial,sans-serif;
  font-weight:900;
  font-size:clamp(24px,3vw,42px);
  letter-spacing:-0.01em;
  line-height:1.1;
  margin:0 0 48px;
  color:var(--accent);
}

.studio-intro p{
  font-size:13px;
  line-height:1.9;
  letter-spacing:0.04em;
  margin:0 0 24px;
  opacity:0.85;
}

.studio-divider{
  width:100%;
  height:1px;
  background:rgba(0,0,0,0.1);
  margin:72px 0;
}

/* Founders */
.studio-founders{
  display:grid;
  grid-template-columns:1fr 1fr;
  gap:80px;
}

.founder{
  display:flex;
  flex-direction:column;
  gap:32px;
}

.founder-img-wrap{
  width:100%;
  aspect-ratio:3/4;
  overflow:hidden;
  background:#f2f2f2;
}

/* placeholder finché non arriva la foto vera */
.founder-img-placeholder{
  width:100%;
  height:100%;
  display:flex;
  align-items:center;
  justify-content:center;
  font-family:"Barlow","Helvetica Neue",sans-serif;
  font-size:48px;
  font-weight:900;
  color:rgba(0,0,0,0.12);
  letter-spacing:-0.02em;
}

/* quando arriverà la foto: sostituisci .founder-img-placeholder con <img> */

.founder-name{
  font-family:"Barlow","Helvetica Neue",sans-serif;
  font-weight:900;
  font-size:18px;
  letter-spacing:2px;
  margin:0 0 4px;
}

.founder-role{
  font-size:10px;
  letter-spacing:4px;
  text-transform:uppercase;
  opacity:0.4;
  margin:0 0 20px;
}

.founder-bio p{
  font-size:12px;
  line-height:1.9;
  letter-spacing:0.04em;
  margin:0 0 16px;
  opacity:0.8;
}

/* Collaborazioni */
.studio-collab{
  display:grid;
  grid-template-columns:200px 1fr;
  gap:40px;
  align-items:start;
}

.collab-list{
  list-style:none;
  padding:0;
  margin:0;
  display:flex;
  flex-direction:column;
  gap:12px;
}

.collab-list li{
  font-size:12px;
  letter-spacing:1.5px;
  text-transform:uppercase;
  padding-bottom:12px;
  border-bottom:1px solid rgba(0,0,0,0.08);
}

/* Mappa */
.studio-map-section{
  display:flex;
  flex-direction:column;
  gap:24px;
}

.studio-map{
  width:100%;
  height:420px;
  border:1px solid rgba(0,0,0,0.1);
  background:#f2f2f2;
}

.studio-map .leaflet-tile-pane{
  filter:grayscale(100%) contrast(1.1) brightness(1.02);
}

.studio-map .leaflet-popup-content{
  font-family:"SF Mono","Helvetica Neue",monospace;
  font-size:11px;
  line-height:1.7;
  letter-spacing:0.03em;
  text-transform:uppercase;
}

/* Responsive */
@media(max-width:900px){
  .studio-hero,
  .studio-founders{
    grid-template-columns:1fr;
    gap:48px;
  }
  .studio-main{padding:0 24px 60px}
  .studio-hero{padding-top:40px}
  .studio-collab{grid-template-columns:1fr;gap:24px}
  .studio-map{height:300px}
}

/* =============================================
   PRESS PAGE
   ============================================= */

.press-main{
  max-width:1400px;
  margin:0 auto;
  padding:0 40px 80px;
}

.press-hero{
  padding-top:60px;
  max-width:760px;
}

.press-intro p{
  font-size:13px;
  line-height:1.9;
  letter-spacing:0.04em;
  margin:0 0 24px;
  opacity:0.85;
}

.press-list{
  display:flex;
  flex-direction:column;
}

.press-item{
  display:grid;
  grid-template-columns:220px 1fr;
  gap:40px;
  padding:40px 0;
  border-bottom:1px solid rgba(0,0,0,0.08);
}

.press-item:first-child{
  border-top:1px solid rgba(0,0,0,0.08);
}

.press-source{
  font-size:11px;
  letter-spacing:1.5px;
  text-transform:uppercase;
  margin:0 0 8px;
  opacity:0.9;
}

.press-date{
  font-size:10px;
  letter-spacing:2px;
  opacity:0.4;
  margin:0;
}

.press-title{
  font-family:"Barlow","Helvetica Neue",Arial,sans-serif;
  font-weight:900;
  font-size:16px;
  letter-spacing:0.2px;
  line-height:1.3;
  margin:0 0 16px;
  color:var(--accent);
}

.press-excerpt{
  font-size:12px;
  line-height:1.9;
  letter-spacing:0.04em;
  margin:0 0 16px;
  opacity:0.8;
}

.press-link{
  font-size:10px;
  letter-spacing:2px;
  text-transform:uppercase;
  color:var(--accent);
  opacity:0.6;
  text-decoration:none;
  transition:opacity 200ms ease;
}

.press-link:hover{
  opacity:1;
}

@media(max-width:900px){
  .press-main{padding:0 24px 60px}
  .press-hero{padding-top:40px}
  .press-item{grid-template-columns:1fr;gap:16px}
}


/*PROGETTI*/
  
  /* PAGE */
  
  .project-page {
    margin: 0;
  }
  
  /* LAYOUT */
  
  .project-layout {
    display: grid;
    grid-template-columns: 2fr 1fr;
  
    gap: 48px;
  
    padding: 0px 180px 80px;
  }

  @media (max-width: 900px) {
    .project-layout {
    display: grid;
    grid-template-columns: 2fr 1fr;
  
    gap: 48px;
  
    padding: 0px 80px 80px;
  }
}
@media (max-width: 480px) {
    .project-layout {
    display: grid;
    grid-template-columns: 1fr;
  
    gap: 0px;
  
    padding: 0px 20px 0px;
  }
}
  
  /* LEFT */
  
  .project-main {
    min-width: 0;
  }

  .project-p{margin-bottom:40px;font-size:12px;margin-right:40px;}
  
  .project-heading {
    margin-bottom: 40px;
  }
  
  .project-heading h1 {
    margin: 0;
  }

  .project-heading p {
    margin-top:0px
  }
  
  .hero-image,
  .project-image {
    margin: 0 0 40px 0;
  }
  
  .hero-image img,
  .project-image img {
    width: 100%;
    display: block;
  }
  
  /* two images row */
  
  .image-row {
    display: grid;
    grid-template-columns: 1fr 1fr;
    gap: 40px;
    margin-bottom: 40px;
  }
  
  .image-row img {
    width: 100%;
    display: block;
  }
  
  /* RIGHT */
  
  .project-sidebar {
    position: sticky;
    top: 0px;
  
    align-self: start;
  }
  
  .facts h3 {
    margin-bottom: 40px;
    font-size:16px
  }
  
  .fact-block {
    margin-bottom: 28px;
  }

  .fact-block p{font-size:12px}
  
  .fact-block strong {
    display: block;
    margin-bottom: 6px;
    font-size:12px
  }

  .pi1 {
  position: relative;
  overflow: hidden;
}

.pi1 img {
  width: 100%;
  display: block;
  transition: transform 0.8s ease;
}

.pi1:hover .pi1v1,
.pi1:hover .pi1v2 {
  transform: scale(1.0);
}

.pi1v2 {
  position: absolute;
  inset: 0;
  opacity: 0;
  transition: opacity 0.8s ease;
}

.pi1:hover .pi1v2 {
  opacity: 1;
}

.project-disegni-gallery {
  column-count: 3;
  column-gap: 40px;
  padding: 0 40px 80px;
  max-width: 1400px;
  margin: 0 auto;
}

@media (max-width: 900px) {
  .project-disegni-gallery {
    column-count: 2;
  }
}

@media (max-width: 600px) {
  .project-disegni-gallery {
    column-count: 1;
  }
}

.project-disegni-gallery img {
  width: 100%;
  height: auto;
  display: block;
  margin-bottom: 40px;
  break-inside: avoid;
}
.image-row img, .project-image img {
    padding: 10px 40px 10px 0 !important;
}


#scroll-to-top {
  position: fixed;
  right: 20px;
  bottom: 20px;
  z-index: 99999;

  width: 42px;
  height: 78px;

  display: flex;
  align-items: center;
  justify-content: center;

  padding: 0;
  border: 0;
  background: transparent;
  color: #fff;

  cursor: pointer;
  mix-blend-mode: difference;

  opacity: 0;
  visibility: hidden;
  transform: translateY(8px);

  transition:
      opacity 0.25s ease,
      visibility 0.25s ease,
      transform 0.25s ease;
}

#scroll-to-top.is-visible {
  opacity: 1;
  visibility: visible;
  transform: translateY(0);
}

/* parentesi sinistra */
#scroll-to-top::before {
  content: "";
  position: absolute;
  top: 0;
  bottom: 0;
  left: 0;

  width: 16px;
  box-sizing: border-box;

  border-top: 4px solid currentColor;
  border-bottom: 4px solid currentColor;
  border-left: 4px solid currentColor;

  transition: transform 0.25s ease;
}

/* parentesi destra */
#scroll-to-top::after {
  content: "";
  position: absolute;
  top: 0;
  bottom: 0;
  right: 0;

  width: 16px;
  box-sizing: border-box;

  border-top: 4px solid currentColor;
  border-right: 4px solid currentColor;
  border-bottom: 4px solid currentColor;

  transition: transform 0.25s ease;
}

#scroll-to-top .top-stack {
  position: relative;
  z-index: 1;

  display: flex;
  flex-direction: column;
  align-items: center;
  justify-content: center;
  gap: 2px;

  font-family: Arial, Helvetica, sans-serif;
  font-size: 11px;
  line-height: 1;
  font-weight: 800;
  letter-spacing: 0;
  text-transform: uppercase;

  transition: transform 0.25s ease;
}

#scroll-to-top .top-stack span {
  display: block;
}

/* hover/click: le parentesi si stringono */
#scroll-to-top:hover::before,
#scroll-to-top.is-clicked::before {
  transform: translateX(2px);
}

#scroll-to-top:hover::after,
#scroll-to-top.is-clicked::after {
  transform: translateX(-2px);
}

#scroll-to-top:hover .top-stack,
#scroll-to-top.is-clicked .top-stack {
  transform: scale(0.96);
}

#scroll-to-top:active {
  transform: translateY(0) scale(0.96);
}

#scroll-to-top:focus-visible {
  outline: 1px dashed currentColor;
  outline-offset: 4px;
}

@media (max-width: 768px) {
  #scroll-to-top {
      right: 12px;
      bottom: 12px;

      width: 38px;
      height: 70px;
  }

  #scroll-to-top::before,
  #scroll-to-top::after {
      width: 15px;
      border-width: 4px;
  }

  #scroll-to-top .top-stack {
      font-size: 10px;
      gap: 1px;
  }
}