/* =========================================================
   BRIANFORM — Sibilia S.r.l., Cantù (CO)
   Design system. Valori brand = variabili CSS.
   ========================================================= */

:root {
  --c-bg:        #FAF8F4;   /* avorio */
  --c-surface:   #FFFFFF;
  --c-surface-2: #F0EBE3;
  --c-ink:       #16130F;
  --c-ink-soft:  #6A6259;
  --c-line:      #E1DAD0;
  --c-accent:    #8B5E3C;   /* cuoio */
  --c-accent-lt: #C29A72;   /* cuoio su fondo scuro */
  --c-dark:      #17130F;

  --f-display: "Playfair Display", "Times New Roman", Georgia, serif;
  --f-body: "Inter", -apple-system, BlinkMacSystemFont, "Segoe UI", Helvetica, Arial, sans-serif;

  --fs-hero:  clamp(2.5rem, 6vw, 5rem);
  --fs-h1:    clamp(2rem, 4.2vw, 3.4rem);
  --fs-h2:    clamp(1.6rem, 2.9vw, 2.5rem);
  --fs-h3:    1.15rem;

  --s-1: .5rem; --s-2: 1rem; --s-3: 1.5rem;
  --s-4: 2.5rem; --s-5: 4.5rem; --s-6: 7rem;
  --wrap: 1400px;
  --gutter: clamp(1.25rem, 4.5vw, 4rem);
  --header-h: 78px;
  --t: 420ms cubic-bezier(.22,.61,.36,1);
}

*, *::before, *::after { box-sizing: border-box; }
* { margin: 0; }
html { scroll-behavior: smooth; -webkit-text-size-adjust: 100%; }
body {
  font-family: var(--f-body); font-size: 1rem; line-height: 1.65;
  color: var(--c-ink); background: var(--c-bg);
  -webkit-font-smoothing: antialiased; overflow-x: hidden;
}
img, svg { display: block; max-width: 100%; height: auto; }
a { color: inherit; text-decoration: none; }
ul { list-style: none; padding: 0; }
button { font: inherit; cursor: pointer; border: 0; background: none; color: inherit; }

.wrap { width: 100%; max-width: var(--wrap); margin-inline: auto; padding-inline: var(--gutter); }
.wrap--narrow { max-width: 900px; }
.section { padding-block: var(--s-6); }
.section--tight { padding-block: var(--s-5); }
.section--dark { background: var(--c-dark); color: #EFE9E1; }
.section--alt { background: var(--c-surface-2); }

h1, h2 { font-family: var(--f-display); font-weight: 400; line-height: 1.12; letter-spacing: -.015em; }
h1 { font-size: var(--fs-h1); }
h2 { font-size: var(--fs-h2); }
h3 { font-size: var(--fs-h3); font-weight: 600; line-height: 1.35; letter-spacing: 0; }

.label { font-size: .68rem; font-weight: 600; letter-spacing: .22em; text-transform: uppercase; color: var(--c-accent); }
.section--dark .label { color: var(--c-accent-lt); }
.label--muted { color: var(--c-ink-soft); }
.lead { font-size: 1.075rem; color: var(--c-ink-soft); max-width: 60ch; }
.section--dark .lead { color: #ADA69C; }
.measure { max-width: 66ch; }
.mt-1 { margin-top: var(--s-2); } .mt-2 { margin-top: var(--s-3); }
.mt-3 { margin-top: var(--s-4); } .mt-4 { margin-top: var(--s-5); }

.btn {
  display: inline-flex; align-items: center; gap: .6rem;
  padding: .95rem 2rem; border: 1px solid var(--c-ink);
  font-size: .76rem; font-weight: 600; letter-spacing: .16em; text-transform: uppercase;
  transition: background var(--t), color var(--t), border-color var(--t);
}
.btn--primary { background: var(--c-ink); color: #fff; }
.btn--primary:hover { background: transparent; color: var(--c-ink); }
.btn--ghost:hover { background: var(--c-ink); color: #fff; }
.btn--light { border-color: #fff; color: #fff; }
.btn--light:hover { background: #fff; color: var(--c-ink); }

.link-arrow {
  display: inline-flex; align-items: center; gap: .55rem;
  font-size: .74rem; font-weight: 600; letter-spacing: .18em; text-transform: uppercase;
  padding-bottom: .45rem; border-bottom: 1px solid currentColor;
  transition: gap var(--t), opacity var(--t);
}
.link-arrow:hover { gap: 1rem; opacity: .65; }

/* ---------------- Header ---------------- */
.site-header {
  position: fixed; inset: 0 0 auto 0; z-index: 200; height: var(--header-h);
  display: flex; align-items: center;
  transition: background var(--t), box-shadow var(--t), color var(--t);
}
.site-header .wrap { display: flex; align-items: center; justify-content: space-between; gap: var(--s-3); }
.site-header.is-solid, .menu-open .site-header, .nav-open .site-header {
  background: var(--c-bg); color: var(--c-ink); box-shadow: 0 1px 0 var(--c-line);
}
body.hero-page:not(.nav-open):not(.menu-open) .site-header:not(.is-solid) { color: #fff; }

.brand img { height: 40px; width: auto; }
.brand .logo-dark { display: block; }
.brand .logo-light { display: none; }
body.hero-page:not(.nav-open):not(.menu-open) .site-header:not(.is-solid) .logo-dark { display: none; }
body.hero-page:not(.nav-open):not(.menu-open) .site-header:not(.is-solid) .logo-light { display: block; }

.nav { display: flex; align-items: center; gap: 2.25rem; }
.nav li { list-style: none; }
.nav > li > a, .nav > li > button {
  font-size: .76rem; font-weight: 600; letter-spacing: .16em; text-transform: uppercase;
  display: inline-flex; align-items: center; gap: .4rem; height: var(--header-h); position: relative;
}
.nav > li > a::after, .nav > li > button::after {
  content: ""; position: absolute; left: 0; bottom: 24px; height: 1px; width: 0;
  background: currentColor; transition: width var(--t);
}
.nav > li > a:hover::after, .nav > li > button:hover::after,
.nav > li > a[aria-current="page"]::after { width: 100%; }

.nav__lang > a { opacity: .7; }
.nav__lang > a:hover { opacity: 1; }
@media (min-width: 1025px) {
  .nav__lang { margin-left: -.75rem; padding-left: 1.5rem; border-left: 1px solid currentColor; height: 14px; display: flex; align-items: center; }
  .nav__lang > a { height: auto; }
  .nav__lang > a::after { bottom: -4px; }
}

.mega {
  position: fixed; left: 0; right: 0; top: var(--header-h);
  background: var(--c-bg); color: var(--c-ink);
  border-top: 1px solid var(--c-line); box-shadow: 0 24px 48px -34px rgba(0,0,0,.4);
  opacity: 0; visibility: hidden; transform: translateY(-8px);
  transition: opacity var(--t), transform var(--t), visibility var(--t); z-index: 190;
}
.mega.is-open { opacity: 1; visibility: visible; transform: none; }
.mega__inner { display: grid; grid-template-columns: repeat(4, 1fr); gap: var(--s-4); padding-block: var(--s-4); }
.mega h4 { font-size: .68rem; font-weight: 600; letter-spacing: .2em; text-transform: uppercase; color: var(--c-accent); margin-bottom: var(--s-2); }
.mega ul li + li { margin-top: .55rem; }
.mega ul a { font-size: .95rem; transition: opacity var(--t); }
.mega ul a:hover { opacity: .55; }

.nav-toggle { display: none; width: 44px; height: 44px; align-items: center; justify-content: center; margin-right: -12px; }
.nav-toggle span { display: block; width: 22px; height: 1.5px; background: currentColor; position: relative; transition: background var(--t); }
.nav-toggle span::before, .nav-toggle span::after {
  content: ""; position: absolute; left: 0; width: 22px; height: 1.5px; background: currentColor; transition: transform var(--t);
}
.nav-toggle span::before { top: -6px; } .nav-toggle span::after { top: 6px; }
.nav-open .nav-toggle span { background: transparent; }
.nav-open .nav-toggle span::before { transform: translateY(6px) rotate(45deg); }
.nav-open .nav-toggle span::after { transform: translateY(-6px) rotate(-45deg); }

@media (max-width: 1024px) {
  .nav-toggle { display: flex; }
  .nav {
    position: fixed; inset: var(--header-h) 0 0 0; background: var(--c-bg); color: var(--c-ink);
    flex-direction: column; align-items: flex-start; justify-content: flex-start;
    gap: 0; padding: var(--s-4) var(--gutter); overflow-y: auto;
    transform: translateX(100%); transition: transform var(--t);
  }
  .nav > li { width: 100%; border-bottom: 1px solid var(--c-line); }
  .nav > li > a, .nav > li > button { height: auto; padding-block: 1.15rem; width: 100%; font-size: .9rem; }
  .nav-open .nav { transform: none; }
  .mega { position: static; box-shadow: none; border: 0; opacity: 1; visibility: visible; transform: none; display: none; }
  .mega.is-open { display: block; }
  .mega__inner { grid-template-columns: 1fr 1fr; padding-block: 0 var(--s-3); gap: var(--s-3); }
}

/* ---------------- Hero ---------------- */
.hero {
  position: relative; min-height: 100svh; display: flex; align-items: flex-end;
  padding-bottom: var(--s-5); overflow: hidden; background: var(--c-surface-2);
}
.hero__media { position: absolute; inset: 0; }
.hero__media img { width: 100%; height: 100%; object-fit: cover; }
.hero__media::after { content: ""; position: absolute; inset: 0;
  background: linear-gradient(180deg, rgba(0,0,0,.42) 0%, rgba(0,0,0,.10) 42%, rgba(0,0,0,.72) 100%); }
.hero .wrap { position: relative; color: #fff; }
.hero__title { font-family: var(--f-display); font-weight: 400; font-size: var(--fs-hero); line-height: 1.08; max-width: 14ch; }
.hero__sub { margin-top: var(--s-3); max-width: 48ch; color: rgba(255,255,255,.88); }
.hero__actions { display: flex; flex-wrap: wrap; gap: var(--s-2); margin-top: var(--s-4); }

.page-hero { padding-top: calc(var(--header-h) + var(--s-5)); padding-bottom: var(--s-5); }
.page-hero h1 { max-width: 19ch; margin-top: var(--s-2); }
.page-hero .lead { margin-top: var(--s-3); }

/* ---------------- Blocchi editoriali ---------------- */
.editorial { display: grid; grid-template-columns: 1fr 1fr; align-items: center; }
.editorial__media { aspect-ratio: 4/3; overflow: hidden; background: var(--c-surface-2); }
.editorial__media img { width: 100%; height: 100%; object-fit: cover; transition: transform 900ms cubic-bezier(.22,.61,.36,1); }
.editorial:hover .editorial__media img { transform: scale(1.03); }
.editorial__body { padding: var(--s-5) clamp(1.5rem, 5vw, 5rem); }
.editorial__body h2 { margin-top: var(--s-2); max-width: 17ch; }
.editorial__body p { margin-top: var(--s-3); color: var(--c-ink-soft); max-width: 48ch; }
.editorial__body .link-arrow { margin-top: var(--s-4); }
.editorial--flip .editorial__media { order: 2; }
@media (max-width: 900px) {
  .editorial { grid-template-columns: 1fr; }
  .editorial--flip .editorial__media { order: 0; }
  .editorial__body { padding: var(--s-4) var(--gutter) var(--s-5); }
}

.banner { position: relative; min-height: 76svh; display: flex; align-items: flex-end; overflow: hidden; }
.banner img { position: absolute; inset: 0; width: 100%; height: 100%; object-fit: cover; }
.banner::after { content: ""; position: absolute; inset: 0; background: linear-gradient(180deg, rgba(0,0,0,.10), rgba(0,0,0,.66)); }
.banner .wrap { position: relative; color: #fff; padding-block: var(--s-5); }
.banner h2 { max-width: 18ch; }
.banner p { margin-top: var(--s-2); max-width: 46ch; color: rgba(255,255,255,.86); }
.banner .btn { margin-top: var(--s-4); }

/* ---------------- Griglie ---------------- */
.grid { display: grid; gap: var(--s-3); }
.grid--2 { grid-template-columns: repeat(auto-fit, minmax(340px, 1fr)); }
.grid--3 { grid-template-columns: repeat(auto-fit, minmax(290px, 1fr)); }
.grid--4 { grid-template-columns: repeat(auto-fit, minmax(230px, 1fr)); }

.tile { display: block; }
.tile__media { aspect-ratio: 4/3; overflow: hidden; background: var(--c-surface-2); }
.tile__media img { width: 100%; height: 100%; object-fit: cover; transition: transform 900ms cubic-bezier(.22,.61,.36,1); }
.tile:hover .tile__media img { transform: scale(1.05); }
.tile__media--contain { background: #fff; display: grid; place-items: center; padding: var(--s-3); }
.tile__media--contain img { object-fit: contain; }
.tile__body { padding-top: var(--s-2); }
.tile__body h3 { margin-top: .4rem; }
.tile__body p { margin-top: .4rem; color: var(--c-ink-soft); font-size: .92rem; }

/* Due colonne responsive */
.split-2 { display: grid; grid-template-columns: 1fr 1fr; gap: var(--s-5); align-items: start; }
.split-2--end { align-items: end; }
.split-2--form { grid-template-columns: 1.3fr 1fr; }
@media (max-width: 900px) {
  .split-2, .split-2--form { grid-template-columns: 1fr; gap: var(--s-4); }
}

.feature { padding-top: var(--s-3); border-top: 1px solid var(--c-line); }
.section--dark .feature { border-color: rgba(255,255,255,.18); }
.feature__num { font-family: var(--f-display); font-size: 1.5rem; color: var(--c-accent); line-height: 1; }
.section--dark .feature__num { color: var(--c-accent-lt); }
.feature h3 { margin-top: var(--s-2); }
.feature p { margin-top: .55rem; color: var(--c-ink-soft); font-size: .93rem; }
.section--dark .feature p { color: #ADA69C; }

.stat__value { font-family: var(--f-display); font-size: clamp(2.4rem, 4.6vw, 3.6rem); line-height: 1; }
.stat__label { margin-top: .7rem; }

/* Indice modelli */
.models { columns: 3; column-gap: var(--s-4); }
@media (max-width: 900px) { .models { columns: 2; } }
@media (max-width: 560px) { .models { columns: 1; } }
.models li {
  break-inside: avoid; padding-block: .7rem; border-bottom: 1px solid var(--c-line);
  display: flex; justify-content: space-between; gap: 1rem; align-items: baseline;
}
.models li span:last-child { font-size: .78rem; color: var(--c-ink-soft); letter-spacing: .06em; text-transform: uppercase; white-space: nowrap; }
.section--dark .models li { border-color: rgba(255,255,255,.16); }
.section--dark .models li span:last-child { color: #ADA69C; }

/* ---------------- Form ---------------- */
.form { display: grid; gap: var(--s-3); }
.field { display: grid; gap: .5rem; }
.field label { font-size: .68rem; letter-spacing: .18em; text-transform: uppercase; font-weight: 600; color: var(--c-ink-soft); }
.field input, .field select, .field textarea {
  font: inherit; color: var(--c-ink); padding: .85rem 0; background: transparent;
  border: 0; border-bottom: 1px solid var(--c-line); border-radius: 0; transition: border-color var(--t);
}
.field input:focus, .field select:focus, .field textarea:focus { outline: none; border-color: var(--c-accent); }
.field textarea { min-height: 130px; resize: vertical; }
.field--row { display: grid; grid-template-columns: 1fr 1fr; gap: var(--s-3); }
@media (max-width: 620px) { .field--row { grid-template-columns: 1fr; } }
.consent { display: flex; gap: .7rem; align-items: flex-start; font-size: .85rem; color: var(--c-ink-soft); }
.consent input { margin-top: .3rem; accent-color: var(--c-accent); }

.newsletter { display: flex; flex-wrap: wrap; gap: var(--s-2); align-items: end; }
.newsletter .field { flex: 1 1 260px; }
.newsletter input { border-bottom-color: rgba(255,255,255,.32); color: #fff; }
.newsletter input:focus { border-bottom-color: #fff; }
.newsletter label { color: #ADA69C; }

/* ---------------- Footer ---------------- */
.site-footer { background: var(--c-dark); color: #ADA69C; padding-block: var(--s-5) var(--s-3); }
.site-footer img { height: 42px; width: auto; }
.site-footer h4 { font-size: .68rem; font-weight: 600; letter-spacing: .2em; text-transform: uppercase; color: #EFE9E1; margin-bottom: var(--s-3); }
.site-footer a:hover { color: #fff; }
.site-footer li + li { margin-top: .55rem; }
.site-footer li a, .site-footer li { font-size: .92rem; transition: color var(--t); }
.footer-grid { display: grid; grid-template-columns: 1.4fr 1fr 1fr 1.1fr; gap: var(--s-4); }
@media (max-width: 900px) { .footer-grid { grid-template-columns: 1fr 1fr; } }
@media (max-width: 560px) { .footer-grid { grid-template-columns: 1fr; } }
.footer-bottom {
  margin-top: var(--s-5); padding-top: var(--s-3); border-top: 1px solid rgba(255,255,255,.14);
  display: flex; flex-wrap: wrap; gap: var(--s-2); justify-content: space-between; font-size: .82rem;
}

/* ---------------- Motion / a11y ---------------- */
.js .reveal { opacity: 0; transform: translateY(20px); transition: opacity 800ms ease, transform 800ms cubic-bezier(.22,.61,.36,1); }
.js .reveal.is-in { opacity: 1; transform: none; }
@media (prefers-reduced-motion: reduce) {
  * { animation: none !important; transition-duration: .01ms !important; scroll-behavior: auto !important; }
  .js .reveal { opacity: 1; transform: none; }
}
:focus-visible { outline: 2px solid var(--c-accent); outline-offset: 3px; }
.skip-link { position: absolute; left: -9999px; }
.skip-link:focus { left: var(--gutter); top: 1rem; z-index: 300; background: var(--c-ink); color: #fff; padding: .75rem 1.25rem; }

/* Elenco progettisti */
.designers { font-size: .95rem; color: var(--c-ink); line-height: 2; }

/* Video di apertura */
.hero__video { width: 100%; height: 100%; object-fit: cover; display: block; background: var(--c-dark); }

/* Bottone play nell'hero */
.btn--play { gap: .8rem; }
.btn--play svg { flex: none; }

/* Film in sovrimpressione */
.filmbox {
  border: 0; padding: 0; max-width: none; max-height: none;
  position: fixed; inset: 0; z-index: 300;
  width: 100%; height: 100%; color: #EFE9E1; overflow: auto;
  background: rgba(10, 8, 6, .96); /* anche senza ::backdrop lo sfondo resta scuro */
}
.filmbox::backdrop { background: rgba(10, 8, 6, .93); }
.filmbox[open] { display: grid; place-items: center; }
.filmbox__inner { width: min(1200px, 92vw); }
.filmbox__video { width: 100%; height: auto; aspect-ratio: 16/9; background: #000; display: block; }
.filmbox__caption { margin-top: var(--s-2); font-size: .85rem; color: #ADA69C; }
.filmbox__close {
  position: fixed; top: 1.25rem; right: 1.25rem; z-index: 2;
  width: 46px; height: 46px; display: grid; place-items: center;
  border: 1px solid rgba(255,255,255,.35); color: #EFE9E1;
  transition: background var(--t), color var(--t);
}
.filmbox__close:hover { background: #EFE9E1; color: var(--c-dark); }
body.film-open { overflow: hidden; }

/* Player video a pagina intera */
.player { position: relative; background: #000; }
.player__video { width: 100%; height: auto; aspect-ratio: 16/9; display: block; background: #000; }

/* Scatti verticali (Fuorisalone) */
.tile--portrait .tile__media { aspect-ratio: 2/3; }

/* Schede di catalogo: le immagini hanno proporzioni molto diverse fra loro.
   Riquadro quadrato e immagine intera: nessun prodotto viene tagliato. */
.tile__media--prodotto {
  aspect-ratio: 1/1; background: var(--c-surface-2);
  display: grid; place-items: center; padding: var(--s-3);
}
.tile__media--prodotto img { object-fit: contain; }
/* fermi immagine tratti dal video: sono 16:9 */
.tile--wide169 .tile__media { aspect-ratio: 16/9; }


/* Novita 2026 — immagini d'ambiente panoramiche */
.editorial--largo .editorial__media { aspect-ratio: 16/10; }
.tile--pano .tile__media { aspect-ratio: 2.36/1; }

/* Il disegno di progetto: foglio bianco, immagine intera */
.editorial__media--foglio {
  aspect-ratio: 3/4; background: #fff;
  display: grid; place-items: center; padding: clamp(1.5rem, 4vw, 3.5rem);
}
.editorial__media--foglio img { object-fit: contain; }

/* Foto delle novita': il riquadro prende le proporzioni della foto, cosi' non viene ritagliata */
.tile__media.media-intera,
.editorial__media.media-intera { aspect-ratio: var(--ar); }

/* --- marchio Stoneform accanto al logo Brianform --- */
.site-header .wrap > .brand { flex: 0 0 auto; }
.marchio-sf {
  flex: 0 0 auto; margin-right: auto; margin-left: 1.1rem; padding-left: 1.1rem;
  border-left: 1px solid currentColor; line-height: 1;
  font-size: .68rem; font-weight: 600; letter-spacing: .18em; text-transform: uppercase;
  opacity: .62; transition: opacity var(--t); text-decoration: none; color: inherit;
  display: inline-flex; align-items: center;
}
.marchio-sf:hover, .marchio-sf:focus-visible { opacity: 1; }
@media (max-width: 900px) {
  .marchio-sf { margin-left: .7rem; padding-left: .7rem; font-size: .6rem; letter-spacing: .12em; }
}
@media (max-width: 420px) { .marchio-sf { display: none; } }