:root {
  --basalte: #1c2228;
  --basalte-2: #2a323a;
  --lagon: #c0601c;
  --lagon-clair: #fbe8d8;
  --soleil: #f0a35e;
  --texte: #1f2933;
  --texte-doux: #5b6770;
  --fond: #ffffff;
  --fond-2: #f5f3ef;
  --bord: #e3e0da;
  --max: 1120px;
}

* { box-sizing: border-box; }
html { scroll-behavior: smooth; }
body {
  margin: 0;
  font-family: system-ui, -apple-system, "Segoe UI", Roboto, "Helvetica Neue", Arial, sans-serif;
  color: var(--texte);
  background: var(--fond);
  line-height: 1.6;
  font-size: 17px;
}
img, svg { max-width: 100%; display: block; }
a { color: var(--lagon); }

.wrap { max-width: var(--max); margin: 0 auto; padding: 0 20px; }

/* En-tête */
header.site {
  position: sticky; top: 0; z-index: 10;
  background: rgba(255,255,255,.95);
  backdrop-filter: blur(6px);
  border-bottom: 1px solid var(--bord);
}
header.site .wrap { display: flex; align-items: center; justify-content: space-between; height: 68px; }
.logo { font-weight: 800; letter-spacing: .08em; text-decoration: none; color: var(--basalte); font-size: 1.15rem; }
.logo span { color: var(--lagon); }
nav.menu { display: flex; gap: 28px; }
nav.menu a { text-decoration: none; color: var(--texte); font-weight: 500; font-size: .95rem; }
nav.menu a:hover { color: var(--lagon); }
.btn {
  display: inline-block; padding: 12px 22px; border-radius: 6px;
  background: var(--lagon); color: #fff; text-decoration: none; font-weight: 600;
  border: 2px solid var(--lagon); transition: background .15s, color .15s;
}
.btn:hover { background: #9e4e16; border-color: #9e4e16; }
.logo img { height: 44px; width: auto; }
.btn.ghost { background: transparent; color: #fff; border-color: rgba(255,255,255,.6); }
.btn.ghost:hover { background: rgba(255,255,255,.1); }

/* Bandeau d'accueil */
.hero {
  position: relative; overflow: hidden;
  background: linear-gradient(90deg, rgba(28,34,40,.94) 0%, rgba(28,34,40,.78) 50%, rgba(28,34,40,.45) 100%),
              url("photos/chantier-4.jpg") center 40% / cover no-repeat var(--basalte);
  color: #fff;
  padding: 130px 0 170px;
}
.hero-legende { position: absolute; right: 20px; bottom: 56px; font-size: .75rem; color: rgba(255,255,255,.7); }

/* Projet à la une */
.une { margin-top: 64px; display: grid; grid-template-columns: 1fr 2.2fr; gap: 36px; align-items: start; }
.une-texte h3 { font-size: 1.8rem; margin: 0; color: var(--basalte); }
.une-texte .lieu { text-transform: uppercase; letter-spacing: .08em; font-size: .85rem; color: var(--texte-doux); margin: 4px 0 16px; }
.une-texte p { color: var(--texte-doux); }
.une-client { font-weight: 600; color: var(--basalte) !important; }
.mosaique { display: grid; grid-template-columns: repeat(4, 1fr); grid-auto-rows: 150px; gap: 10px; grid-auto-flow: dense; }
.mosaique figure { margin: 0; overflow: hidden; border-radius: 8px; background: var(--basalte); }
.mosaique .large { grid-column: span 2; grid-row: span 2; }
.mosaique .wide { grid-column: span 2; }
.mosaique img { width: 100%; height: 100%; object-fit: cover; transition: transform .4s; }
.mosaique figure:hover img { transform: scale(1.04); }
.galerie img, .mosaique img { cursor: zoom-in; }
.une.inverse { grid-template-columns: 2.2fr 1fr; }
.une.inverse .une-texte { order: 2; }
@media (max-width: 900px) {
  .une, .une.inverse { grid-template-columns: 1fr; }
  .une.inverse .une-texte { order: 0; }
}
@media (max-width: 640px) { .mosaique { grid-template-columns: 1fr 1fr; grid-auto-rows: 130px; } }

/* Visionneuse */
dialog#visionneuse { border: 0; padding: 0; background: transparent; max-width: 94vw; max-height: 94vh; }
dialog#visionneuse::backdrop { background: rgba(10,12,14,.9); }
dialog#visionneuse img { max-width: 94vw; max-height: 86vh; width: auto; height: auto; border-radius: 6px; }
dialog#visionneuse p { color: #d5dbe0; text-align: center; margin: 10px 0 0; font-size: .95rem; }
dialog#visionneuse .fermer { position: fixed; top: 14px; right: 18px; background: none; border: 0; color: #fff; font-size: 2.4rem; line-height: 1; cursor: pointer; }

/* Galerie chantier */
.galerie { display: grid; grid-template-columns: 2fr 1fr 1fr; grid-template-rows: 220px 220px; gap: 12px; margin-top: 24px; }
.galerie figure { margin: 0; overflow: hidden; border-radius: 8px; background: var(--basalte); }
.galerie figure:first-child { grid-row: span 2; }
.galerie figure:nth-child(4) { grid-column: span 2; }
.galerie img { width: 100%; height: 100%; object-fit: cover; transition: transform .4s; }
.galerie figure:hover img { transform: scale(1.03); }
.galerie-legende { font-size: .9rem; color: var(--texte-doux); margin-top: 10px; }
@media (max-width: 640px) {
  .galerie { grid-template-columns: 1fr 1fr; grid-template-rows: none; grid-auto-rows: 150px; }
  .galerie figure:first-child { grid-column: span 2; grid-row: auto; }
  .galerie figure:nth-child(4) { grid-column: span 2; }
  .hero-legende { display: none; }
}
.hero h1 { font-size: clamp(2rem, 5vw, 3.4rem); line-height: 1.15; margin: 0 0 20px; max-width: 760px; }
.hero p { font-size: 1.15rem; color: #c9d1d8; max-width: 620px; margin: 0 0 34px; }
.hero .actions { display: flex; gap: 14px; flex-wrap: wrap; }
.hero .relief { position: absolute; left: 0; right: 0; bottom: -2px; width: 100%; height: auto; }
.surtitre { text-transform: uppercase; letter-spacing: .16em; font-size: .8rem; color: var(--soleil); font-weight: 700; margin-bottom: 14px; }

/* Sections */
section { padding: 90px 0; }
section.alt { background: var(--fond-2); }
h2 { font-size: clamp(1.6rem, 3.5vw, 2.3rem); margin: 0 0 14px; color: var(--basalte); }
.intro { color: var(--texte-doux); max-width: 680px; margin: 0 0 48px; font-size: 1.08rem; }

.grille { display: grid; grid-template-columns: repeat(3, 1fr); gap: 24px; }
.carte {
  background: #fff; border: 1px solid var(--bord); border-radius: 10px; padding: 28px;
}
.carte .num { font-weight: 800; color: var(--lagon); font-size: .9rem; letter-spacing: .1em; }
.carte h3 { margin: 8px 0 10px; font-size: 1.15rem; color: var(--basalte); }
.carte p { margin: 0; color: var(--texte-doux); font-size: .97rem; }

/* Méthode */
.etapes { display: grid; grid-template-columns: repeat(4, 1fr); gap: 0; counter-reset: e; }
.etape { padding: 0 22px 0 0; border-top: 3px solid var(--lagon); padding-top: 18px; margin-right: 12px; }
.etape h3 { margin: 0 0 8px; font-size: 1.05rem; }
.etape p { margin: 0; color: var(--texte-doux); font-size: .95rem; }

/* Réalisations */
.projet { background: #fff; border-radius: 10px; overflow: hidden; border: 1px solid var(--bord); }
.projet .visuel {
  aspect-ratio: 4/3; background: linear-gradient(135deg, var(--basalte-2), var(--lagon));
  display: flex; align-items: center; justify-content: center; color: rgba(255,255,255,.7); font-size: .9rem;
}
.projet .infos { padding: 20px 22px; }
.projet .infos h3 { margin: 0 0 4px; font-size: 1.05rem; }
.projet .infos p { margin: 0; color: var(--texte-doux); font-size: .92rem; }
.op { background: #fff; border: 1px solid var(--bord); border-top: 4px solid var(--lagon); border-radius: 8px; padding: 20px 22px; }
.op.en-cours { border-top-color: var(--basalte); background: var(--basalte); color: #fff; }
.op .annee { font-size: .8rem; font-weight: 700; color: var(--lagon); letter-spacing: .08em; }
.op.en-cours .annee { color: var(--soleil); }
.op h3 { margin: 4px 0 2px; font-size: 1.05rem; color: var(--basalte); }
.op.en-cours h3 { color: #fff; }
.op .lieu { font-size: .85rem; text-transform: uppercase; letter-spacing: .06em; color: var(--texte-doux); margin: 0 0 10px; }
.op.en-cours .lieu, .op.en-cours p { color: #c9d1d8; }
.op p { margin: 0; font-size: .93rem; color: var(--texte-doux); }
.op .montant { display: inline-block; margin-top: 12px; font-weight: 700; color: var(--basalte); font-size: .95rem; }
.op.en-cours .montant { color: var(--soleil); font-size: 1.3rem; }
h3.sous-titre { font-size: 1.2rem; color: var(--basalte); margin: 56px 0 20px; }
h3.sous-titre:first-of-type { margin-top: 0; }
.parcours { list-style: none; padding: 0; margin: 20px 0 0; border-left: 2px solid var(--lagon); }
.parcours li { padding: 0 0 18px 20px; position: relative; }
.parcours li::before { content: ""; position: absolute; left: -7px; top: 7px; width: 12px; height: 12px; border-radius: 50%; background: var(--lagon); }
.parcours strong { display: block; color: var(--basalte); }
.parcours span { color: var(--texte-doux); font-size: .95rem; }
.anciens { columns: 2; column-gap: 40px; padding: 0; margin: 0; list-style: none; font-size: .95rem; }
.anciens li { break-inside: avoid; padding: 8px 0; border-bottom: 1px solid var(--bord); color: var(--texte-doux); }
.anciens b { color: var(--basalte); }
@media (max-width: 640px) { .anciens { columns: 1; } }
.tag { display: inline-block; background: var(--lagon-clair); color: #8a4410; font-size: .78rem; font-weight: 600; padding: 3px 10px; border-radius: 20px; margin-bottom: 10px; }

/* Agence */
.deux-col { display: grid; grid-template-columns: 1.2fr 1fr; gap: 60px; align-items: center; }
.chiffres { display: grid; grid-template-columns: 1fr 1fr; gap: 20px; }
.chiffre { background: var(--basalte); color: #fff; border-radius: 10px; padding: 26px; }
.chiffre strong { display: block; font-size: 2.2rem; color: var(--soleil); line-height: 1.1; }
.chiffre span { color: #c9d1d8; font-size: .92rem; }

/* Contact */
.contact { background: var(--basalte); color: #fff; }
.contact h2 { color: #fff; }
.contact .intro { color: #c9d1d8; }
.contact-grille { display: grid; grid-template-columns: repeat(3, 1fr); gap: 24px; }
.contact-bloc { border: 1px solid rgba(255,255,255,.15); border-radius: 10px; padding: 24px; }
.contact-bloc h3 { margin: 0 0 8px; font-size: .85rem; text-transform: uppercase; letter-spacing: .12em; color: var(--soleil); }
.contact-bloc p, .contact-bloc a { margin: 0; color: #fff; font-size: 1.05rem; text-decoration: none; word-break: break-word; }
.contact-bloc a:hover { text-decoration: underline; }

footer.site { background: #12171b; color: #8b969f; font-size: .88rem; padding: 26px 0; }
footer.site .wrap { display: flex; justify-content: space-between; gap: 16px; flex-wrap: wrap; }
footer.site a { color: #b8c2ca; }

/* Page texte (mentions légales) */
.page-texte { padding: 70px 0; }
.page-texte .wrap { max-width: 780px; }
.page-texte h1 { color: var(--basalte); }
.page-texte h2 { font-size: 1.3rem; margin-top: 36px; }

.a-completer { background: #fff3cd; color: #7a5a00; padding: 0 4px; border-radius: 3px; }

/* Mobile */
@media (max-width: 900px) {
  .grille, .contact-grille { grid-template-columns: 1fr 1fr; }
  .etapes { grid-template-columns: 1fr 1fr; row-gap: 30px; }
  .deux-col { grid-template-columns: 1fr; gap: 36px; }
}
@media (max-width: 640px) {
  body { font-size: 16px; }
  nav.menu { display: none; }
  .grille, .contact-grille, .etapes { grid-template-columns: 1fr; }
  section { padding: 64px 0; }
  .hero { padding: 70px 0 110px; }
  .wrap { padding: 0 16px; }
}