:root{
  --anthracite:#2B2B2B; --terracotta:#B5603F; --terracotta-fonce:#9A4E31; --terracotta-clair:#D9855F;
  --sable:#E8DFD3; --lin:#F5F1EB; --gris:#5E5850; --gris-clair:#D6CFC6; --blanc:#FFFFFF;
  --marge:clamp(20px,6.5vw,96px);
}
*{box-sizing:border-box}
html{scroll-behavior:smooth}
body{margin:0;font-family:'Jost',Century Gothic,sans-serif;color:var(--anthracite);background:var(--blanc);font-size:17px;line-height:1.6}
img{max-width:100%;height:auto;display:block}
a{color:var(--terracotta-fonce)}
a:hover{color:#7A3C25}
h1,h2,h3{font-weight:300;margin:0;line-height:1.15}
h3{font-weight:500}
p{margin:0}
.wrap{padding-left:var(--marge);padding-right:var(--marge)}
.label{font-size:13px;font-weight:500;letter-spacing:.24em;text-transform:uppercase;color:var(--terracotta-fonce)}
.slogan{font-family:'Cormorant Garamond',Garamond,serif;font-style:italic}
.muted{color:var(--gris)}
.btn{display:inline-block;padding:17px 30px;border-radius:2px;font-weight:500;letter-spacing:.08em;text-transform:uppercase;font-size:14px;text-decoration:none;border:1px solid transparent;cursor:pointer;font-family:inherit}
.btn-plein{background:var(--terracotta-fonce);color:#fff}
.btn-plein:hover{background:#7A3C25;color:#fff}
.btn-trait{border-color:var(--anthracite);color:var(--anthracite)}
.btn-trait:hover{background:var(--anthracite);color:#fff}
:focus-visible{outline:2px solid var(--terracotta-fonce);outline-offset:3px}

/* En-tête */
.entete{position:sticky;top:0;z-index:10;background:#fff;border-bottom:1px solid var(--sable);height:88px;display:flex;align-items:center;justify-content:space-between}
.entete .logo img{height:54px;width:auto}
.menu{display:flex;align-items:center;gap:36px;font-size:15px;letter-spacing:.06em}
.menu a{color:var(--anthracite);text-decoration:none}
.menu a:hover{color:var(--terracotta-fonce)}
.menu .btn{color:#fff;padding:13px 22px;font-size:13px}
.burger,#menu-toggle{display:none}

/* Accroche */
.hero{background:var(--lin);display:grid;grid-template-columns:1fr 1fr;gap:72px;align-items:center;padding-top:72px;padding-bottom:72px}
.hero-texte{display:flex;flex-direction:column;gap:24px}
.hero h1{font-size:clamp(34px,4vw,56px);letter-spacing:-.01em}
.hero .slogan{font-size:28px;color:var(--gris)}
.hero p{font-size:18px;color:var(--gris);max-width:540px}
.hero .actions{display:flex;flex-wrap:wrap;gap:16px;margin-top:6px}
.hero-visuel{aspect-ratio:1/0.95;background:var(--sable);position:relative;display:flex;align-items:center;justify-content:center}
.hero-visuel::before{content:"";position:absolute;inset:20px;border:1px solid #fff}
.hero-visuel img{width:46%;opacity:.9}
.hero-visuel img.photo{position:absolute;inset:0;width:100%;height:100%;object-fit:cover;opacity:1}

/* Atouts */
.atouts{display:grid;grid-template-columns:repeat(3,1fr);gap:48px;padding-top:44px;padding-bottom:44px;border-bottom:1px solid var(--sable)}
.atout{display:flex;gap:18px;align-items:flex-start}
.atout svg{flex-shrink:0}
.atout strong{display:block;font-weight:500;font-size:17px}
.atout span{font-size:15px;color:var(--gris)}

/* Sections */
.section{padding-top:96px;padding-bottom:104px}
.section-tete{display:flex;justify-content:space-between;align-items:flex-end;gap:48px;margin-bottom:48px}
.section-tete h2{font-size:clamp(28px,3vw,40px);margin-top:12px}
.section-tete p{max-width:460px;color:var(--gris);font-size:16px}
.cartes{display:grid;grid-template-columns:repeat(4,1fr);gap:24px}
.carte{border:1px solid var(--sable);padding:36px 30px;display:flex;flex-direction:column;gap:16px}
.carte h3{font-size:21px}
.carte p{font-size:15px;color:var(--gris)}

.methode{background:var(--anthracite);color:#fff}
.methode .label{color:var(--terracotta-clair)}
.etapes{display:grid;grid-template-columns:repeat(4,1fr);gap:40px}
.etape{border-top:1px solid var(--gris);padding-top:24px;display:flex;flex-direction:column;gap:12px}
.etape .num{font-size:44px;font-weight:300;color:var(--terracotta-clair);line-height:1}
.etape h3{font-size:20px}
.etape p{font-size:15px;color:var(--gris-clair)}

.realisations{background:var(--lin)}
.galerie{display:grid;grid-template-columns:3fr 2fr;grid-template-rows:auto auto;gap:24px}
.galerie figure{margin:0;overflow:hidden;background:var(--sable)}
.galerie img{width:100%;height:100%;object-fit:cover;object-position:right bottom}
.photo-grande{grid-row:span 2;aspect-ratio:4/3.2}
.photo-petite{aspect-ratio:4/3}
.projet-texte{display:flex;flex-direction:column;gap:12px;align-self:end}
.projet-texte h3{font-size:24px;font-weight:400}
.projet-texte p{color:var(--gris);font-size:16px}
.projet{display:flex;flex-direction:column;gap:12px}
.projet .visuel{aspect-ratio:4/3.6;background:var(--sable);display:flex;align-items:center;justify-content:center;overflow:hidden}
.projet .visuel img{width:100%;height:100%;object-fit:cover}
.projet .visuel .vide{font-size:13px;letter-spacing:.1em;text-transform:uppercase;color:var(--gris)}
.projet h3{font-size:18px}
.projet p{font-size:14px;color:var(--gris)}

/* Contact */
.contact{display:grid;grid-template-columns:5fr 7fr;gap:80px}
.contact-infos{display:flex;flex-direction:column;gap:22px}
.contact-infos h2{font-size:clamp(28px,3vw,40px);line-height:1.2}
.filet{height:1px;background:var(--sable);margin:8px 0}
.coord{display:flex;flex-direction:column;gap:12px}
.coord span{color:var(--gris)}
form{background:var(--lin);padding:44px;display:grid;grid-template-columns:1fr 1fr;gap:20px}
label{display:flex;flex-direction:column;gap:8px;font-size:14px;font-weight:500}
input,select,textarea{font:inherit;font-weight:400;font-size:16px;border:1px solid #CFC5B7;background:#fff;border-radius:2px;padding:12px 14px;color:var(--anthracite)}
input,select{height:50px;padding-top:0;padding-bottom:0}
textarea{resize:vertical;min-height:140px}
.large{grid-column:span 2}
.form-bas{grid-column:span 2;display:flex;align-items:center;justify-content:space-between;gap:24px;flex-wrap:wrap}
.form-bas small{font-size:13px;color:var(--gris)}
.pot{position:absolute;left:-9999px}
.message{grid-column:span 2;padding:14px 16px;font-size:15px;display:none}
.message.ok{display:block;background:#fff;border-left:3px solid var(--terracotta)}
.message.erreur{display:block;background:#fff;border-left:3px solid var(--anthracite)}

/* Pied de page */
.pied{background:var(--anthracite);color:var(--gris-clair);padding-top:56px;padding-bottom:40px;display:flex;flex-direction:column;gap:36px}
.pied-haut{display:flex;justify-content:space-between;align-items:center;gap:32px;flex-wrap:wrap}
.pied-haut img{height:60px;width:auto}
.pied nav{display:flex;gap:32px;flex-wrap:wrap}
.pied nav a{color:#fff;text-decoration:none;font-size:15px}
.pied-bas{border-top:1px solid #4A4643;padding-top:24px;display:flex;justify-content:space-between;gap:16px;flex-wrap:wrap;font-size:13px}
.pied-bas a{color:var(--gris-clair)}

/* Page texte (mentions légales) */
.page-texte{max-width:820px;padding-top:72px;padding-bottom:96px}
.page-texte h1{font-size:40px;margin-bottom:32px}
.page-texte h2{font-size:22px;font-weight:500;margin:36px 0 10px}
.page-texte p{margin-bottom:10px;color:var(--gris)}

/* Tablette */
@media (max-width:1100px){
  .cartes,.etapes{grid-template-columns:repeat(2,1fr)}
  .hero{gap:40px}
  .contact{grid-template-columns:1fr;gap:48px}
}
/* Mobile */
@media (max-width:820px){
  body{font-size:16px}
  .entete{height:72px}
  .entete .logo img{height:42px}
  .burger{display:flex;flex-direction:column;justify-content:center;gap:6px;width:44px;height:44px;cursor:pointer}
  .burger span{display:block;height:1.5px;background:var(--anthracite)}
  .menu{position:absolute;top:72px;left:0;right:0;background:#fff;flex-direction:column;align-items:stretch;gap:0;padding:8px var(--marge) 24px;border-bottom:1px solid var(--sable);display:none}
  .menu a{padding:14px 0;border-bottom:1px solid var(--sable)}
  .menu .btn{margin-top:16px;text-align:center;border-bottom:none}
  #menu-toggle:checked ~ .menu{display:flex}
  .hero{grid-template-columns:1fr;padding-top:48px;padding-bottom:56px}
  .hero .slogan{font-size:24px}
  .hero p{font-size:17px}
  .atouts{grid-template-columns:1fr;gap:24px}
  .section{padding-top:64px;padding-bottom:72px}
  .section-tete{flex-direction:column;align-items:flex-start;gap:16px;margin-bottom:32px}
  .cartes,.etapes,.galerie{grid-template-columns:1fr}
  .photo-grande{grid-row:auto}
  form{grid-template-columns:1fr;padding:28px 22px}
  .large,.form-bas,.message{grid-column:span 1}
  .form-bas .btn{width:100%;text-align:center}
}

/* Comparatif 3D / réalisation */
.comparatif{margin-top:72px;padding-top:56px;border-top:1px solid var(--sable);display:grid;grid-template-columns:1fr 3fr;gap:40px;align-items:end}
.comparatif-texte{display:flex;flex-direction:column;gap:12px}
.comparatif-texte h3{font-size:24px;font-weight:400}
.comparatif-texte p{color:var(--gris);font-size:16px}
.comparatif-images{display:grid;grid-template-columns:1fr 1fr;gap:24px}
.comparatif figure{margin:0;display:flex;flex-direction:column;gap:10px}
.comparatif img{width:100%;height:auto;aspect-ratio:4/3;object-fit:cover}
.comparatif figcaption{font-size:13px;font-weight:500;letter-spacing:.2em;text-transform:uppercase;color:var(--terracotta-fonce)}
@media (max-width:1100px){.comparatif{grid-template-columns:1fr}}
@media (max-width:820px){.comparatif{margin-top:48px;padding-top:40px}.comparatif-images{grid-template-columns:1fr}}

/* Étapes du chantier */
.etapes-chantier{grid-column:1/-1;margin-top:16px}
.etapes-chantier h4{margin:0 0 20px;font-size:13px;font-weight:500;letter-spacing:.2em;text-transform:uppercase;color:var(--terracotta-fonce)}
.etapes-chantier ol{list-style:none;margin:0;padding:0;display:grid;grid-template-columns:repeat(5,1fr);gap:16px}
.etapes-chantier li{display:flex;flex-direction:column;gap:8px}
.etapes-chantier img{width:100%;height:auto;aspect-ratio:4/3;object-fit:cover}
.etapes-chantier .num{font-size:28px;font-weight:300;color:var(--terracotta);line-height:1;margin-top:4px}
.etapes-chantier .titre{font-size:15px;line-height:1.4}
@media (max-width:1100px){.etapes-chantier ol{grid-template-columns:repeat(3,1fr)}}
@media (max-width:820px){.etapes-chantier ol{grid-template-columns:repeat(2,1fr)}}