/* ==========================================================================
   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 */
.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-color:var(--yellow);color:var(--yellow);padding:9px 16px}
.btn-call:hover{background:var(--yellow);color:var(--carbon)}

/* 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,.55) 0%,rgba(18,18,18,.35) 40%,rgba(18,18,18,.94) 100%),
             url("../img/chantier-3.jpeg") center/cover no-repeat;
  transform:scale(1.04);
}
.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-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}

/* Responsive -------------------------------------------------------------- */
@media (max-width:980px){
  .about-grid,.contact-grid{grid-template-columns:1fr}
  .svc-grid{grid-template-columns:1fr}
  .hero-meta{display:none}
}
@media (max-width:760px){
  .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%}
  .gallery{grid-template-columns:1fr 1fr}
  .row{grid-template-columns:1fr}
  .pillars{grid-template-columns:1fr}
}
@media (max-width:460px){
  .gallery{grid-template-columns:1fr}
  .wordmark{font-size:1.25rem;letter-spacing:.14em}
}