/* ==========================================================================
   ZAYOUN — Protection incendie passive
   Design system: industrial / firestop
   Carbon black + safety yellow, condensed signage display type
   ========================================================================== */

:root{
  --carbon:#121212;
  --graphite:#1c1c1c;
  --steel:#2a2a2a;
  --line:#343434;
  --paper:#f4f4f2;
  --paper-dim:#cfcfca;
  --grey:#8d8d88;
  --yellow:#f5c518;
  --yellow-deep:#d9aa00;
  --white:#ffffff;

  --display:"Oswald", "Arial Narrow", system-ui, sans-serif;
  --body:"Inter", system-ui, -apple-system, "Segoe UI", sans-serif;

  --maxw:1200px;
  --gutter:clamp(20px, 5vw, 64px);
  --r:4px;
}

/* Reset ------------------------------------------------------------------- */
*{box-sizing:border-box;margin:0;padding:0}
html{scroll-behavior:smooth;-webkit-text-size-adjust:100%}
body{
  font-family:var(--body);
  background:var(--carbon);
  color:var(--paper);
  line-height:1.65;
  font-size:17px;
  overflow-x:hidden;
}
img{max-width:100%;display:block}
a{color:inherit;text-decoration:none}
ul{list-style:none}

@media (prefers-reduced-motion:reduce){
  html{scroll-behavior:auto}
  *,*::before,*::after{animation-duration:.001ms!important;transition-duration:.001ms!important}
}

/* Type -------------------------------------------------------------------- */
h1,h2,h3,h4{font-family:var(--display);font-weight:600;line-height:1.02;text-transform:uppercase;letter-spacing:.01em}
.eyebrow{
  font-family:var(--display);font-weight:600;text-transform:uppercase;
  letter-spacing:.22em;font-size:.74rem;color:var(--yellow);
  display:inline-flex;align-items:center;gap:.6rem;
}
.eyebrow::before{content:"";width:26px;height:2px;background:var(--yellow);display:inline-block}

/* Layout ------------------------------------------------------------------ */
.wrap{max-width:var(--maxw);margin-inline:auto;padding-inline:var(--gutter)}
section{padding-block:clamp(64px,9vw,120px)}
.section-head{max-width:760px;margin-bottom:clamp(32px,5vw,56px)}
.section-head h2{
  font-size:clamp(2.1rem,5vw,3.6rem);margin-top:14px;
}
.section-head p{color:var(--paper-dim);margin-top:18px;font-size:1.05rem}

/* Hazard stripe (signature device) --------------------------------------- */
.hazard{
  height:10px;width:100%;
  background:repeating-linear-gradient(
    -45deg,var(--yellow) 0 22px,var(--carbon) 22px 44px);
}

/* Header ------------------------------------------------------------------ */
.site-header{
  position:sticky;top:0;z-index:60;
  background:rgba(18,18,18,.86);
  backdrop-filter:blur(10px);
  border-bottom:1px solid var(--line);
}
.bar{display:flex;align-items:center;justify-content:space-between;gap:24px;height:74px}
.brand{display:flex;align-items:center;gap:12px}
.brand .z{width:34px;height:34px;flex:none}
.wordmark{
  font-family:var(--display);font-weight:700;text-transform:uppercase;
  font-size:1.5rem;letter-spacing:.18em;color:var(--paper);line-height:1;
}
.wordmark b{color:var(--yellow);font-weight:700}

.nav{display:flex;align-items:center;gap:30px}
.nav a{
  font-family:var(--display);text-transform:uppercase;font-size:.85rem;
  letter-spacing:.12em;color:var(--paper-dim);font-weight:500;
  padding-block:6px;position:relative;transition:color .2s;
}
.nav a:hover,.nav a:focus-visible{color:var(--white)}
.nav a::after{
  content:"";position:absolute;left:0;bottom:0;width:0;height:2px;
  background:var(--yellow);transition:width .25s ease;
}
.nav a:hover::after,.nav a:focus-visible::after{width:100%}

.header-actions{display:flex;align-items:center;gap:16px}

/* Language switcher shown inside the mobile menu (hidden on desktop) */
.nav-lang{display:none}

/* Language switcher */
.lang{display:flex;align-items:center;gap:2px;border:1px solid var(--line);border-radius:var(--r);overflow:hidden}
.lang a{
  font-family:var(--display);font-size:.78rem;font-weight:600;letter-spacing:.1em;
  padding:6px 10px;color:var(--grey);transition:.2s;text-transform:uppercase;
}
.lang a:hover{color:var(--white)}
.lang a[aria-current="true"]{background:var(--yellow);color:var(--carbon)}

/* Buttons ----------------------------------------------------------------- */
.btn{
  display:inline-flex;align-items:center;gap:10px;
  font-family:var(--display);text-transform:uppercase;font-weight:600;
  letter-spacing:.1em;font-size:.9rem;
  padding:13px 24px;border-radius:var(--r);border:2px solid transparent;
  cursor:pointer;transition:transform .15s ease,background .2s,color .2s,border-color .2s;
}
.btn-primary{background:var(--yellow);color:var(--carbon)}
.btn-primary:hover{background:var(--white);transform:translateY(-2px)}
.btn-ghost{border-color:var(--line);color:var(--paper)}
.btn-ghost:hover{border-color:var(--yellow);color:var(--yellow)}
.btn-call{
  background:transparent;border:1px solid var(--yellow);color:var(--yellow);
  font-weight:500;letter-spacing:.08em;padding:8px 16px;
}
.btn-call:hover{background:var(--yellow);color:var(--carbon);border-color:var(--yellow);transform:none}

/* Mobile nav toggle */
.burger{display:none;background:none;border:1px solid var(--line);border-radius:var(--r);
  width:46px;height:42px;cursor:pointer;flex-direction:column;gap:5px;align-items:center;justify-content:center}
.burger span{width:20px;height:2px;background:var(--paper);transition:.25s}
.burger[aria-expanded="true"] span:nth-child(1){transform:translateY(7px) rotate(45deg)}
.burger[aria-expanded="true"] span:nth-child(2){opacity:0}
.burger[aria-expanded="true"] span:nth-child(3){transform:translateY(-7px) rotate(-45deg)}

/* Hero -------------------------------------------------------------------- */
.hero{position:relative;min-height:clamp(560px,86vh,820px);display:flex;align-items:flex-end;
  border-bottom:1px solid var(--line);overflow:hidden}
.hero::before{
  content:"";position:absolute;inset:0;
  background:
    linear-gradient(180deg,rgba(18,18,18,.62) 0%,rgba(18,18,18,.42) 38%,rgba(18,18,18,.95) 100%),
    image-set(url("../img/hero.webp") type("image/webp"), url("../img/hero.jpg") type("image/jpeg"))
      center/cover no-repeat;
  background-color:var(--carbon);
  transform:scale(1.04);
}
/* Fallback for browsers without image-set support */
@supports not (background:image-set(url("a.webp") type("image/webp"))){
  .hero::before{
    background:linear-gradient(180deg,rgba(18,18,18,.62),rgba(18,18,18,.42) 38%,rgba(18,18,18,.95)),
               url("../img/hero.jpg") center/cover no-repeat;
  }
}
.hero-inner{position:relative;z-index:2;padding-bottom:clamp(48px,7vw,90px);max-width:840px}
.hero h1{
  font-size:clamp(2.8rem,8.5vw,6.4rem);color:var(--white);margin-top:18px;
  text-shadow:0 2px 30px rgba(0,0,0,.4);
}
.hero h1 em{color:var(--yellow);font-style:normal}
.hero .lead{color:var(--paper-dim);font-size:clamp(1.05rem,2.2vw,1.3rem);margin-top:22px;max-width:600px}
.hero-cta{display:flex;gap:14px;flex-wrap:wrap;margin-top:34px}
.hero-meta{position:absolute;right:var(--gutter);bottom:clamp(48px,7vw,90px);z-index:2;text-align:right;display:none}
.hero-meta .k{font-family:var(--display);font-size:2.6rem;color:var(--yellow);line-height:1}
.hero-meta .l{font-size:.78rem;letter-spacing:.16em;text-transform:uppercase;color:var(--paper-dim)}

/* Trust strip ------------------------------------------------------------- */
.strip{background:var(--graphite);border-bottom:1px solid var(--line)}
.strip .wrap{display:flex;flex-wrap:wrap;gap:18px 40px;align-items:center;justify-content:space-between;padding-block:22px}
.strip-item{display:flex;align-items:center;gap:12px;font-family:var(--display);text-transform:uppercase;
  letter-spacing:.1em;font-size:.92rem;color:var(--paper-dim)}
.strip-item b{color:var(--yellow)}

/* About ------------------------------------------------------------------- */
.about{background:var(--carbon)}
.about-grid{display:grid;grid-template-columns:1.05fr .95fr;gap:clamp(32px,5vw,72px);align-items:center}
.about-grid .lead-p{font-size:1.15rem;color:var(--paper)}
.about-grid p{color:var(--paper-dim);margin-top:16px}
.pillars{display:grid;grid-template-columns:1fr 1fr;gap:1px;background:var(--line);border:1px solid var(--line);border-radius:var(--r);overflow:hidden}
.pillar{background:var(--graphite);padding:26px 24px}
.pillar .n{font-family:var(--display);color:var(--yellow);font-size:1.1rem;letter-spacing:.14em}
.pillar h3{font-size:1.25rem;margin-top:8px;color:var(--white)}
.pillar p{font-size:.95rem;color:var(--grey);margin-top:8px}

/* Services ---------------------------------------------------------------- */
.services{background:var(--graphite);border-block:1px solid var(--line)}
.svc-grid{display:grid;grid-template-columns:repeat(2,1fr);gap:20px}
.svc{
  background:var(--carbon);border:1px solid var(--line);border-radius:var(--r);
  padding:34px 30px;position:relative;overflow:hidden;transition:border-color .25s,transform .25s;
}
.svc::before{content:"";position:absolute;left:0;top:0;width:4px;height:0;background:var(--yellow);transition:height .3s ease}
.svc:hover{border-color:var(--steel);transform:translateY(-3px)}
.svc:hover::before{height:100%}
.svc .ico{width:46px;height:46px;color:var(--yellow);margin-bottom:18px}
.svc h3{font-size:1.45rem;color:var(--white)}
.svc p{color:var(--paper-dim);margin-top:12px;font-size:.98rem}
.svc ul{margin-top:16px;display:grid;gap:9px}
.svc li{display:flex;gap:10px;font-size:.94rem;color:var(--paper-dim)}
.svc li::before{content:"";flex:none;width:7px;height:7px;margin-top:8px;background:var(--yellow)}

.systems{margin-top:30px;display:flex;flex-wrap:wrap;gap:10px}
.tag{
  font-family:var(--display);text-transform:uppercase;letter-spacing:.1em;font-size:.8rem;
  border:1px solid var(--line);border-radius:99px;padding:8px 16px;color:var(--paper-dim);
}
.tag b{color:var(--yellow);font-weight:600}

/* Realisations ------------------------------------------------------------ */
.work{background:var(--carbon)}
.gallery{display:grid;grid-template-columns:repeat(3,1fr);gap:14px}
.shot{position:relative;border-radius:var(--r);overflow:hidden;aspect-ratio:4/5;border:1px solid var(--line)}
.shot img{width:100%;height:100%;object-fit:cover;transition:transform .5s ease;filter:saturate(.95)}
.shot:hover img{transform:scale(1.06)}
.shot figcaption{
  position:absolute;inset:auto 0 0 0;padding:36px 18px 16px;
  background:linear-gradient(180deg,transparent,rgba(18,18,18,.92));
  font-family:var(--display);text-transform:uppercase;letter-spacing:.06em;
  font-size:.86rem;color:var(--white);
}
.shot figcaption span{display:block;color:var(--yellow);font-size:.72rem;letter-spacing:.16em;margin-bottom:4px}

/* Contact ----------------------------------------------------------------- */
.contact{background:var(--graphite);border-top:1px solid var(--line)}
.contact-grid{display:grid;grid-template-columns:.9fr 1.1fr;gap:clamp(32px,5vw,64px)}
.contact-info .ci{display:flex;gap:16px;padding:18px 0;border-bottom:1px solid var(--line)}
.contact-info .ci:first-of-type{border-top:1px solid var(--line)}
.contact-info .ico{width:24px;height:24px;color:var(--yellow);flex:none;margin-top:3px}
.contact-info .ci .lab{font-family:var(--display);text-transform:uppercase;letter-spacing:.14em;font-size:.74rem;color:var(--grey)}
.contact-info .ci .val{font-size:1.1rem;color:var(--white);font-weight:500}
.contact-info .ci a.val:hover{color:var(--yellow)}

form{display:grid;gap:16px}
.row{display:grid;grid-template-columns:1fr 1fr;gap:16px}
label{font-family:var(--display);text-transform:uppercase;letter-spacing:.12em;font-size:.74rem;color:var(--grey);display:block;margin-bottom:7px}
input,textarea{
  width:100%;background:var(--carbon);border:1px solid var(--line);border-radius:var(--r);
  color:var(--paper);font-family:var(--body);font-size:1rem;padding:13px 15px;transition:border-color .2s;
}
input:focus,textarea:focus{outline:none;border-color:var(--yellow)}
textarea{resize:vertical;min-height:130px}
.form-note{font-size:.82rem;color:var(--grey)}

/* Footer ------------------------------------------------------------------ */
.site-footer{background:var(--carbon);border-top:1px solid var(--line)}
.foot{display:flex;flex-wrap:wrap;gap:24px;justify-content:space-between;align-items:center;padding-block:34px}
.foot .wordmark{font-size:1.2rem}
.foot p{color:var(--grey);font-size:.85rem}
.foot .credit{color:var(--grey);opacity:.85}
.foot .credit a{color:var(--paper-dim);border-bottom:1px solid transparent;transition:color .2s,border-color .2s}
.foot .credit a:hover,.foot .credit a:focus-visible{color:var(--yellow);border-color:var(--yellow)}
.foot-links{display:flex;gap:22px;flex-wrap:wrap}
.foot-links a{font-family:var(--display);text-transform:uppercase;letter-spacing:.1em;font-size:.78rem;color:var(--paper-dim)}
.foot-links a:hover{color:var(--yellow)}

/* Reveal animation -------------------------------------------------------- */
.reveal{opacity:0;transform:translateY(22px);transition:opacity .6s ease,transform .6s ease}
.reveal.in{opacity:1;transform:none}

/* Header brand mark image */
.brand .z{width:34px;height:34px}

/* Zones d'intervention --------------------------------------------------- */
.zones{background:var(--carbon);border-bottom:1px solid var(--line)}
.zones .section-head{margin-bottom:clamp(28px,4vw,44px)}
/* Illustration bornée et centrée (jamais plein écran) */
.zones-illu{
  display:block;width:100%;max-width:1000px;height:auto;margin:0 auto clamp(32px,5vw,48px);
  border:1px solid var(--line);border-radius:var(--r);background:var(--graphite);
}
/* Liste compacte des 4 points sous l'illustration */
.zones-list{display:grid;grid-template-columns:repeat(4,1fr);gap:18px;max-width:1000px;margin:0 auto}
.zone-pt{display:flex;gap:12px;align-items:flex-start}
.zone-pt .num{font-family:var(--display);font-weight:600;color:var(--carbon);background:var(--yellow);
  width:30px;height:30px;flex:none;display:grid;place-items:center;border-radius:var(--r);font-size:.92rem}
.zone-pt h3{font-size:1.02rem;color:var(--white);margin-bottom:3px}
.zone-pt p{font-size:.88rem;color:var(--grey);line-height:1.5}

/* Zones desservies — coverage ------------------------------------------- */
.areas{background:var(--carbon)}
.areas-grid{display:grid;grid-template-columns:repeat(3,1fr);gap:18px;margin-top:8px}
.area{background:var(--graphite);border:1px solid var(--line);border-radius:var(--r);padding:26px 24px}
.area h3{font-size:1.3rem;color:var(--white);display:flex;align-items:center;gap:10px}
.area h3 svg{width:24px;height:24px;color:var(--yellow);flex:none}
.area p{color:var(--grey);font-size:.95rem;margin-top:10px}
.area .cities{margin-top:14px;display:flex;flex-wrap:wrap;gap:8px}
.area .cities span{font-size:.8rem;color:var(--paper-dim);border:1px solid var(--line);border-radius:99px;padding:5px 12px;white-space:nowrap}

/* Marques & systèmes — partner wall ------------------------------------- */
.brands{background:var(--graphite);border-block:1px solid var(--line)}
.brandwall{display:grid;grid-template-columns:repeat(3,minmax(0,200px));
  gap:clamp(14px,2.5vw,24px);justify-content:center;align-items:stretch;margin-top:8px}
.brandwall a{display:flex;align-items:center;justify-content:center;
  height:96px;padding:16px 24px;
  background:var(--paper);border:1px solid var(--line);border-radius:var(--r);
  transition:border-color .25s ease,transform .25s ease}
.brandwall img{height:40px;width:auto;max-width:150px;object-fit:contain;
  filter:grayscale(1);opacity:.62;transition:filter .25s ease,opacity .25s ease}
.brandwall a:hover,.brandwall a:focus-visible{border-color:var(--yellow);transform:translateY(-2px)}
.brandwall a:hover img,.brandwall a:focus-visible img{filter:none;opacity:1}
.brands .note{text-align:center;color:var(--grey);font-size:.82rem;margin-top:26px}

/* FAQ -------------------------------------------------------------------- */
.faq{background:var(--carbon)}
.faq-list{display:grid;gap:0;border-top:1px solid var(--line);max-width:880px}
.faq-list details{border-bottom:1px solid var(--line)}
.faq-list summary{
  list-style:none;cursor:pointer;padding:22px 48px 22px 0;position:relative;
  font-family:var(--display);text-transform:uppercase;letter-spacing:.04em;
  font-size:1.08rem;color:var(--white);transition:color .2s;
}
.faq-list summary::-webkit-details-marker{display:none}
.faq-list summary:hover,.faq-list summary:focus-visible{color:var(--yellow)}
.faq-list summary::after{
  content:"";position:absolute;right:6px;top:50%;width:14px;height:14px;margin-top:-7px;
  background:
    linear-gradient(var(--yellow),var(--yellow)) center/14px 2px no-repeat,
    linear-gradient(var(--yellow),var(--yellow)) center/2px 14px no-repeat;
  transition:transform .25s ease;
}
.faq-list details[open] summary::after{transform:rotate(45deg)}
.faq-list details p{color:var(--paper-dim);padding:0 40px 24px 0;font-size:.98rem}

/* Form states ----------------------------------------------------------- */
.hp{position:absolute!important;left:-9999px!important;width:1px;height:1px;overflow:hidden}
.btn[disabled]{opacity:.6;cursor:progress}
.form-status{font-size:.92rem;margin-top:4px;display:none}
.form-status.show{display:block}
.form-status.ok{color:var(--yellow)}
.form-status.err{color:#ff7a6b}

/* Skip link — caché hors focus clavier ---------------------------------- */
.skip{
  position:absolute;width:1px;height:1px;padding:0;margin:-1px;overflow:hidden;
  clip:rect(0 0 0 0);clip-path:inset(50%);white-space:nowrap;border:0;
  background:var(--yellow);color:var(--carbon);
  font-family:var(--display);text-transform:uppercase;letter-spacing:.08em;z-index:200;
}
.skip:focus,.skip:focus-visible{
  position:fixed;left:12px;top:12px;width:auto;height:auto;margin:0;overflow:visible;
  clip:auto;clip-path:none;padding:10px 16px;border-radius:var(--r);
}

/* Visible focus everywhere */
a:focus-visible,button:focus-visible,summary:focus-visible,input:focus-visible,textarea:focus-visible{
  outline:2px solid var(--yellow);outline-offset:2px;border-radius:2px;
}

/* Responsive -------------------------------------------------------------- */
/* Tablet & below: collapse layout grids and switch to the hamburger nav.
   The desktop nav needs ~960px, so it must fold before then to avoid overflow. */
@media (max-width:980px){
  .about-grid,.contact-grid{grid-template-columns:1fr}
  .svc-grid{grid-template-columns:1fr}
  .areas-grid{grid-template-columns:1fr}
  .zones-list{grid-template-columns:1fr 1fr}
  .hero-meta{display:none}

  .nav,.header-actions .lang{display:none}
  .burger{display:flex}
  .nav.open{
    display:flex;position:absolute;top:74px;left:0;right:0;flex-direction:column;gap:0;
    background:var(--carbon);border-bottom:1px solid var(--line);padding:8px var(--gutter) 18px;
  }
  .nav.open a{padding:14px 0;border-bottom:1px solid var(--line);width:100%}
  .nav.open .nav-lang{display:flex;gap:8px;padding:16px 0 2px}
  .nav.open .nav-lang a{
    width:auto;padding:8px 15px;border:1px solid var(--line);border-radius:var(--r);
    font-family:var(--display);text-transform:uppercase;font-weight:600;font-size:.82rem;
    letter-spacing:.1em;color:var(--grey);
  }
  .nav.open .nav-lang a[aria-current="true"]{background:var(--yellow);color:var(--carbon)}
  .nav.open .nav-lang a:hover,.nav.open .nav-lang a:focus-visible{color:var(--white)}
}
@media (max-width:760px){
  .gallery{grid-template-columns:1fr 1fr}
  .row{grid-template-columns:1fr}
  .pillars{grid-template-columns:1fr}
  .brandwall{grid-template-columns:1fr;max-width:320px;margin-inline:auto}
}
@media (max-width:460px){
  .gallery{grid-template-columns:1fr}
  .zones-list{grid-template-columns:1fr}
  .wordmark{font-size:1.25rem;letter-spacing:.14em}
}
/* Very narrow phones: tighten the header so actions never overflow */
@media (max-width:380px){
  .bar{gap:10px}
  .header-actions{gap:10px}
  .btn-call{padding:8px 12px;letter-spacing:.04em}
  .wordmark{font-size:1.12rem;letter-spacing:.08em}
  .brand .z{width:28px;height:28px}
}