/* ==========================================================================
   ATRISTEEL — design tokens
   Palette imposée par la charte du logo (acier brossé / anthracite).
   Le vert WhatsApp est réservé exclusivement aux éléments WhatsApp.
   ========================================================================== */
:root{
  --color-background:#f7f7f5;
  --color-surface:#ffffff;
  --color-anthracite:#1d2426;
  --color-graphite:#111718;
  --color-steel:#5e6668;
  --color-metal:#a6acac;
  --color-border:#d7dada;
  --color-text:#1d2426;
  --color-text-muted:#60686a;
  --color-whatsapp:#25d366;
  --color-whatsapp-dark:#1da851;

  --font-sans:"Avenir Next","Avenir","Century Gothic","Nunito Sans",Montserrat,-apple-system,BlinkMacSystemFont,"Segoe UI",Roboto,Helvetica,Arial,sans-serif;

  --space-3xs:.25rem;
  --space-2xs:.5rem;
  --space-xs:.75rem;
  --space-sm:1rem;
  --space-md:1.5rem;
  --space-lg:2rem;
  --space-xl:3rem;
  --space-2xl:4rem;
  --space-3xl:6rem;

  --radius-sm:4px;
  --radius-md:10px;
  --radius-lg:20px;

  --shadow-sm:0 1px 2px rgba(17,23,24,.06);
  --shadow-md:0 10px 28px rgba(17,23,24,.09);
  --shadow-lg:0 26px 56px rgba(17,23,24,.16);

  --container-max:1200px;
  --header-h:80px;
}

/* ---------- Reset ---------- */
*,*::before,*::after{box-sizing:border-box;}
html{scroll-behavior:smooth;}
body{
  margin:0;
  font-family:var(--font-sans);
  color:var(--color-text);
  background:var(--color-background);
  -webkit-font-smoothing:antialiased;
  overflow-x:hidden;
}
img{max-width:100%;display:block;}
a{color:inherit;text-decoration:none;}
ul{list-style:none;margin:0;padding:0;}
button{font-family:inherit;}
h1,h2,h3,h4{font-family:var(--font-sans);margin:0;line-height:1.2;color:var(--color-anthracite);font-weight:800;text-transform:uppercase;letter-spacing:.01em;}
p{margin:0;color:var(--color-text-muted);line-height:1.7;}
.container{max-width:var(--container-max);margin:0 auto;padding:0 var(--space-md);}
section.section{padding:var(--space-3xl) 0;}

@media (max-width:768px){
  section.section{padding:var(--space-2xl) 0;}
}

@media (prefers-reduced-motion: reduce){
  html{scroll-behavior:auto;}
  *,*::before,*::after{animation-duration:.001ms !important;animation-iteration-count:1 !important;transition-duration:.001ms !important;}
}

/* Skip link */
.skip-link{
  position:absolute;left:12px;top:-60px;
  background:var(--color-anthracite);color:#fff;
  padding:10px 18px;border-radius:var(--radius-sm);
  z-index:2000;transition:top .2s ease;
  font-weight:700;font-size:14px;
}
.skip-link:focus{top:12px;}

/* Focus visibility */
a:focus-visible,button:focus-visible,input:focus-visible,select:focus-visible,textarea:focus-visible{
  outline:2.5px solid var(--color-anthracite);
  outline-offset:2px;
}

/* ---------- Reusable ---------- */
.eyebrow{
  display:inline-block;
  font-weight:800;
  font-size:13px;
  letter-spacing:.14em;
  text-transform:uppercase;
  color:var(--color-steel);
  margin-bottom:var(--space-sm);
}
.section-head{max-width:640px;margin:0 auto var(--space-2xl);text-align:center;}
.section-head h2{font-size:clamp(1.7rem,3.6vw,2.5rem);margin-bottom:var(--space-sm);letter-spacing:-0.01em;}
.section-head p{font-size:17px;}
.section-head.on-dark h2{color:#fff;}
.section-head.on-dark p{color:var(--color-metal);}

.btn{
  display:inline-flex;align-items:center;justify-content:center;gap:9px;
  font-weight:800;font-size:14px;
  text-transform:uppercase;letter-spacing:.03em;
  padding:14px 26px;
  border-radius:var(--radius-sm);
  border:1.5px solid transparent;
  cursor:pointer;
  transition:transform .18s ease, box-shadow .18s ease, background-color .18s ease, color .18s ease, border-color .18s ease;
  white-space:nowrap;
}
.btn svg{flex:none;}
.btn-primary{
  background:var(--color-anthracite);
  color:#fff;
  box-shadow:var(--shadow-sm);
}
.btn-primary:hover{background:var(--color-graphite);transform:translateY(-2px);box-shadow:var(--shadow-md);}
.btn-outline{
  background:transparent;
  border-color:var(--color-border);
  color:var(--color-anthracite);
}
.btn-outline:hover{border-color:var(--color-anthracite);transform:translateY(-2px);}
.btn-outline.on-dark{border-color:rgba(255,255,255,.28);color:#fff;}
.btn-outline.on-dark:hover{border-color:#fff;background:rgba(255,255,255,.06);}
.btn-whatsapp{
  background:var(--color-whatsapp);
  color:#fff;
  box-shadow:0 10px 24px rgba(37,211,102,.32);
}
.btn-whatsapp:hover{background:var(--color-whatsapp-dark);transform:translateY(-2px);}
.btn-lg{padding:16px 30px;font-size:16px;}
.btn-block{width:100%;}

/* ---------- Header ---------- */
.site-header{
  position:fixed;top:0;left:0;right:0;height:var(--header-h);
  display:flex;align-items:center;
  background:rgba(247,247,245,.9);
  backdrop-filter:blur(10px);
  border-bottom:1px solid var(--color-border);
  z-index:900;
}
.header-inner{display:flex;align-items:center;justify-content:space-between;gap:var(--space-md);}
.logo{display:flex;align-items:center;gap:10px;}
.logo-mark-img{height:36px;width:auto;display:block;}
.logo-text{font-weight:800;font-size:19px;letter-spacing:.01em;color:var(--color-anthracite);}
.logo-text.light{color:#fff;}

.main-nav{display:flex;align-items:center;gap:var(--space-lg);}
.main-nav a{
  font-size:14.5px;font-weight:700;color:var(--color-text-muted);
  position:relative;padding:6px 0;transition:color .2s ease;
}
.main-nav a::after{
  content:"";position:absolute;left:0;bottom:0;height:2px;width:0%;
  background:var(--color-anthracite);transition:width .25s ease;
}
.main-nav a:hover,.main-nav a:focus-visible{color:var(--color-anthracite);}
.main-nav a:hover::after,.main-nav a:focus-visible::after{width:100%;}
.nav-cta{display:none;}

.header-cta{display:flex;align-items:center;gap:var(--space-md);}
.icon-link{
  display:flex;align-items:center;justify-content:center;
  width:38px;height:38px;border-radius:var(--radius-sm);
  color:var(--color-anthracite);
  border:1.5px solid var(--color-border);
  transition:border-color .2s ease, background-color .2s ease;
}
.icon-link:hover{border-color:var(--color-anthracite);background:var(--color-surface);}

.burger{
  display:none;flex-direction:column;justify-content:center;gap:5px;
  width:42px;height:42px;background:transparent;border:1.5px solid var(--color-border);border-radius:var(--radius-sm);cursor:pointer;
}
.burger span{width:20px;height:2px;background:var(--color-anthracite);border-radius:2px;transition:.25s ease;margin:0 auto;}
.burger.open span:nth-child(1){transform:translateY(7px) rotate(45deg);}
.burger.open span:nth-child(2){opacity:0;}
.burger.open span:nth-child(3){transform:translateY(-7px) rotate(-45deg);}

@media (max-width:960px){
  .main-nav{
    position:fixed;top:var(--header-h);left:0;right:0;
    flex-direction:column;align-items:stretch;gap:0;
    background:var(--color-surface);
    border-bottom:1px solid var(--color-border);
    max-height:0;overflow:hidden;
    transition:max-height .35s ease;
  }
  .main-nav.open{max-height:420px;}
  .main-nav a{width:100%;padding:16px var(--space-md);border-bottom:1px solid var(--color-border);}
  .main-nav a::after{display:none;}
  .header-cta{display:none;}
  .burger{display:flex;}
  .nav-cta{
    display:block;font-weight:800;color:var(--color-anthracite) !important;
  }
}

/* ---------- Hero ---------- */
.hero{
  position:relative;
  min-height:640px;
  display:flex;align-items:center;
  padding:calc(var(--header-h) + var(--space-xl)) 0 var(--space-2xl);
  overflow:hidden;
  color:#fff;
}
.hero-media{position:absolute;inset:0;z-index:0;}
.hero-media img{width:100%;height:100%;object-fit:cover;}
.hero-overlay{
  position:absolute;inset:0;z-index:1;
  background:linear-gradient(100deg, rgba(10,13,14,.94) 0%, rgba(10,13,14,.82) 32%, rgba(10,13,14,.5) 60%, rgba(10,13,14,.22) 100%);
}
.hero-inner{position:relative;z-index:2;}
.hero-copy{max-width:640px;position:relative;padding-left:var(--space-lg);}
.hero-copy::before{
  content:"";position:absolute;left:0;top:6px;bottom:44px;width:3px;
  background:var(--color-metal);
}
.hero .eyebrow{color:var(--color-metal);}
.hero h1{
  color:#fff;
  text-transform:uppercase;
  font-size:clamp(2rem,4.4vw,3.4rem);
  letter-spacing:0.01em;
  margin:var(--space-sm) 0 var(--space-md);
}
.hero-lead{font-size:17.5px;max-width:480px;margin-bottom:var(--space-xl);color:var(--color-metal);}
.hero-actions{display:flex;flex-wrap:wrap;gap:var(--space-sm);}

@media (max-width:700px){
  .hero{min-height:0;padding:calc(var(--header-h) + var(--space-lg)) 0 calc(var(--space-2xl) + 56px);}
  .hero-copy{padding-left:var(--space-md);}
}

/* ---------- Products ---------- */
.product-grid{display:grid;grid-template-columns:repeat(2,1fr);gap:var(--space-lg);max-width:820px;margin:0 auto;}
.product-card{
  background:var(--color-surface);
  border:1px solid var(--color-border);
  border-radius:var(--radius-lg);
  clip-path:polygon(0 0,calc(100% - 26px) 0,100% 26px,100% 100%,0 100%);
  overflow:hidden;
  display:flex;flex-direction:column;
  transition:transform .25s ease, box-shadow .25s ease, border-color .25s ease;
}
.product-card:hover{transform:translateY(-6px);box-shadow:var(--shadow-md);border-color:var(--color-anthracite);}
.product-card-media{
  aspect-ratio:3/2;overflow:hidden;background:var(--color-background);
  border-bottom:1px solid var(--color-border);
}
.product-card-media img{width:100%;height:100%;object-fit:cover;transition:transform .4s ease;}
.product-card:hover .product-card-media img{transform:scale(1.04);}
.product-card-body{padding:var(--space-lg);display:flex;flex-direction:column;flex:1;}
.product-card h3{font-size:20px;margin-bottom:10px;}
.product-card-body p{margin-bottom:var(--space-lg);flex:1;}
.card-link{
  display:inline-flex;align-items:center;gap:8px;
  font-weight:800;font-size:14.5px;color:var(--color-anthracite);
  padding-top:var(--space-sm);border-top:1px solid var(--color-border);
  transition:gap .2s ease, color .2s ease;
  background:none;border-left:none;border-right:none;border-bottom:none;cursor:pointer;text-align:left;
  width:100%;
}
.card-link svg{transition:transform .2s ease;}
.card-link:hover{gap:12px;color:var(--color-steel);}

@media (max-width:900px){.product-grid{grid-template-columns:1fr;}}

/* ---------- Bannière fractionnée : Pourquoi ATRISTEEL + CTA ---------- */
.split-band{display:grid;grid-template-columns:1fr 1fr;}
.split-col{padding:var(--space-3xl) var(--space-xl);min-width:0;}
.split-why{background:var(--color-graphite);}
.split-why .eyebrow{color:var(--color-metal);}
.split-why h2{color:#fff;font-size:clamp(1.5rem,2.6vw,2rem);margin-bottom:var(--space-lg);}

.avantage-list{display:flex;flex-direction:column;gap:var(--space-md);}
.avantage-list li{display:flex;align-items:flex-start;gap:14px;}
.avantage-list li > div{min-width:0;}
.avantage-icon{
  flex:none;width:46px;height:46px;
  border:1.5px solid rgba(255,255,255,.18);
  border-radius:var(--radius-sm);
  display:flex;align-items:center;justify-content:center;
  color:var(--color-metal);
}
.avantage-list strong{display:block;color:#fff;font-size:15px;text-transform:uppercase;margin-bottom:3px;}
.avantage-list li > div > span{display:block;color:var(--color-metal);font-size:13.5px;line-height:1.6;}

.split-cta{
  background:#23292b;
  display:flex;flex-direction:column;justify-content:center;
}
.split-cta h2{color:#fff;font-size:clamp(1.5rem,2.6vw,2rem);margin-bottom:var(--space-sm);}
.split-cta p{color:var(--color-metal);font-size:15.5px;margin-bottom:var(--space-lg);}
.cta-actions{display:flex;gap:var(--space-sm);flex-wrap:wrap;}
.split-cta .btn-primary{background:#fff;color:var(--color-anthracite);}
.split-cta .btn-primary:hover{background:var(--color-background);}

@media (max-width:800px){
  .split-band{grid-template-columns:1fr;}
  .split-col{padding:var(--space-2xl) var(--space-md);}
}

@media (max-width:480px){
  .cta-actions .btn{width:100%;}
}

/* ---------- Réalisations ---------- */
.realisations-grid{display:grid;grid-template-columns:repeat(4,1fr);gap:var(--space-md);}
.realisation-card{
  padding:var(--space-lg) var(--space-md);
  background:var(--color-surface);
  border:1px solid var(--color-border);
  border-radius:var(--radius-md);
  transition:transform .25s ease, box-shadow .25s ease;
}
.realisation-card:hover{transform:translateY(-4px);box-shadow:var(--shadow-md);}
.realisation-tag{
  display:inline-block;font-weight:800;font-size:12px;letter-spacing:.08em;
  color:var(--color-metal);margin-bottom:var(--space-sm);
}
.realisation-card h3{font-size:17px;margin-bottom:8px;}
.realisation-card p{font-size:14px;}

@media (max-width:900px){.realisations-grid{grid-template-columns:1fr 1fr;}}
@media (max-width:560px){.realisations-grid{grid-template-columns:1fr;}}

/* ---------- About ---------- */
.about{background:var(--color-surface);border-top:1px solid var(--color-border);border-bottom:1px solid var(--color-border);}
.about-inner{max-width:760px;margin:0 auto;text-align:center;}
.about-inner h2{font-size:clamp(1.7rem,3.4vw,2.4rem);margin-bottom:var(--space-md);}
.about-inner p{font-size:17.5px;}

/* ---------- Contact ---------- */
.contact-inner{display:grid;grid-template-columns:.9fr 1.1fr;gap:var(--space-2xl);}
.contact-info h2{font-size:clamp(1.7rem,3.4vw,2.2rem);margin-bottom:var(--space-md);}
.contact-info p{font-size:16px;margin-bottom:var(--space-xl);}
.contact-list{display:flex;flex-direction:column;gap:var(--space-md);}
.contact-item{display:flex;align-items:flex-start;gap:14px;}
.contact-item .icon-badge{
  flex:none;width:40px;height:40px;border-radius:var(--radius-sm);
  background:var(--color-background);border:1px solid var(--color-border);
  display:flex;align-items:center;justify-content:center;color:var(--color-anthracite);
}
.contact-item div{display:flex;flex-direction:column;gap:2px;padding-top:4px;}
.contact-item strong{font-size:14.5px;color:var(--color-anthracite);}
.contact-item a,.contact-item span{font-size:14.5px;color:var(--color-text-muted);}
.contact-item a:hover{color:var(--color-anthracite);}

.contact-form{
  background:var(--color-surface);border-radius:var(--radius-lg);
  padding:var(--space-lg);border:1px solid var(--color-border);
}
.form-row{display:grid;grid-template-columns:1fr 1fr;gap:var(--space-md);}
.form-field{margin-bottom:var(--space-md);display:flex;flex-direction:column;gap:8px;}
.form-field label{font-size:13.5px;font-weight:800;color:var(--color-anthracite);}
.form-field input,.form-field select,.form-field textarea{
  font-family:inherit;
  border:1.5px solid var(--color-border);
  border-radius:var(--radius-sm);
  padding:12px 14px;font-size:14.5px;color:var(--color-text);
  background:var(--color-background);
  transition:border-color .2s ease, box-shadow .2s ease;
  resize:vertical;
}
.form-field input:focus,.form-field select:focus,.form-field textarea:focus{
  outline:none;border-color:var(--color-anthracite);
  box-shadow:0 0 0 3px rgba(29,36,38,.1);
}
.form-note{min-height:20px;margin-top:var(--space-sm);font-size:13.5px;font-weight:700;color:var(--color-steel);text-align:center;}

@media (max-width:900px){
  .contact-inner{grid-template-columns:1fr;}
  .form-row{grid-template-columns:1fr;}
}

/* ---------- Footer ---------- */
.site-footer{background:var(--color-graphite);padding-top:var(--space-2xl);}
.footer-inner{
  display:grid;grid-template-columns:1.4fr 1fr 1fr 1fr;
  gap:var(--space-xl);padding-bottom:var(--space-xl);
  border-bottom:1px solid rgba(255,255,255,.1);
}
.footer-brand p{color:var(--color-metal);font-size:14px;margin-top:var(--space-sm);max-width:260px;}
.footer-parent{color:var(--color-steel) !important;font-size:12.5px !important;text-transform:uppercase;letter-spacing:.04em;}
.footer-address-label{color:#fff;font-weight:800;}
.footer-social{display:flex;gap:10px;margin-top:var(--space-md);}
.footer-social .icon-link{border-color:rgba(255,255,255,.18);color:#fff;}
.footer-social .icon-link:hover{border-color:#fff;background:rgba(255,255,255,.06);}
.footer-col h4{color:#fff;font-size:14.5px;margin-bottom:var(--space-sm);}
.footer-col{display:flex;flex-direction:column;gap:12px;}
.footer-col a,.footer-col span{color:var(--color-metal);font-size:14px;transition:color .2s ease;}
.footer-col a:hover{color:#fff;}
.footer-bottom{
  padding:var(--space-md) 0;
  display:flex;justify-content:space-between;flex-wrap:wrap;gap:10px;
  font-size:13px;color:var(--color-steel);
}
.footer-bottom a{color:var(--color-steel);}
.footer-bottom a:hover{color:var(--color-metal);}

@media (max-width:800px){.footer-inner{grid-template-columns:1fr 1fr;}}
@media (max-width:520px){.footer-inner{grid-template-columns:1fr;}}

/* ---------- Floating WhatsApp button ---------- */
.whatsapp-float{
  position:fixed;bottom:24px;right:24px;
  display:flex;align-items:center;gap:10px;
  background:var(--color-whatsapp);color:#fff;
  padding:14px;border-radius:50%;
  box-shadow:0 12px 28px rgba(37,211,102,.4);
  z-index:800;
  transition:transform .2s ease, border-radius .2s ease, padding .2s ease;
}
.whatsapp-float span{
  display:none;font-weight:800;font-size:14px;white-space:nowrap;
}
.whatsapp-float:hover{transform:scale(1.05);}
@media (min-width:700px){
  .whatsapp-float{border-radius:100px;padding:14px 22px 14px 16px;}
  .whatsapp-float span{display:inline;}
}

/* ---------- Reveal on scroll ----------
   Le contenu reste visible par défaut (sans JS, ou si le script est lent/
   bloqué). L'animation n'est activée qu'une fois la classe "js" posée sur
   <html> par le script inline en tête de page, pour ne jamais rendre du
   contenu dépendant d'un script qui pourrait échouer. */
.js .reveal{opacity:0;transform:translateY(24px);transition:opacity .6s ease, transform .6s ease;}
.js .reveal.in-view{opacity:1;transform:translateY(0);}
@media (prefers-reduced-motion: reduce){
  .js .reveal{opacity:1;transform:none;transition:none;}
}