:root {
  --bleu: #1e73be;
  --bleu-fonce: #155a96;
  --nuit: #1a1f26;
  --texte: #333;
  --gris: #666;
  --fond: #f4f6f8;
  --blanc: #fff;
}
* { box-sizing: border-box; }
body { margin: 0; font: 16px/1.6 system-ui, -apple-system, "Segoe UI", Roboto, Arial, sans-serif; color: var(--texte); background: var(--nuit); min-height: 100vh; display: flex; flex-direction: column; }
main { flex: 1; background: var(--blanc); }
img { max-width: 100%; height: auto; display: block; }
a { color: var(--bleu); }
h1, h2, h3, h4 { line-height: 1.25; color: var(--nuit); margin: 0 0 .6em; }
.contenu { max-width: 1140px; margin: 0 auto; padding: 0 20px; }
.section { padding: 64px 0; }
.section.gris { background: var(--fond); }
.titre { text-align: center; margin-bottom: 40px; }
.titre h2 { font-size: 2rem; }
.titre h2::after { content: ""; display: block; width: 60px; height: 3px; background: var(--bleu); margin: 14px auto 0; }

/* Barre du haut et en-tete */
.barre { background: var(--nuit); color: #ccc; font-size: .875rem; }
.barre .contenu { display: flex; justify-content: space-between; flex-wrap: wrap; gap: 6px 20px; padding-top: 8px; padding-bottom: 8px; }
.barre a { color: #fff; text-decoration: none; }
.entete { background: var(--blanc); border-bottom: 1px solid #e5e5e5; }
.entete .contenu { display: flex; align-items: center; justify-content: space-between; flex-wrap: wrap; gap: 16px; padding-top: 14px; padding-bottom: 14px; }
.entete .logo img { width: 220px; }
.badges { display: flex; gap: 28px; flex-wrap: wrap; }
.badge strong { display: block; color: var(--nuit); font-size: .95rem; }
.badge span { color: var(--gris); font-size: .85rem; }
nav { background: var(--bleu); }
nav ul { list-style: none; margin: 0 auto; padding: 0 20px; max-width: 1140px; display: flex; flex-wrap: wrap; }
nav a { display: block; padding: 14px 20px; color: #fff; text-decoration: none; font-weight: 600; text-transform: uppercase; font-size: .9rem; letter-spacing: .03em; }
nav a:hover, nav a[aria-current="page"] { background: var(--bleu-fonce); }

/* Bandeau d'accueil et bandeau de page */
.hero { position: relative; color: #fff; background: var(--nuit) url(img/factory_slider_c.jpg) center / cover; }
.hero::before { content: ""; position: absolute; inset: 0; background: linear-gradient(90deg, rgba(10,20,35,.85), rgba(10,20,35,.35)); }
.hero .contenu { position: relative; padding-top: 110px; padding-bottom: 110px; }
.hero h1 { color: #fff; font-size: clamp(2rem, 5vw, 3.2rem); max-width: 14em; }
.hero p { font-size: 1.25rem; max-width: 30em; margin: 0 0 28px; }
.bouton { display: inline-block; background: var(--bleu); color: #fff; padding: 12px 28px; border-radius: 3px; text-decoration: none; font-weight: 600; border: 0; font-size: 1rem; cursor: pointer; }
.bouton:hover { background: var(--bleu-fonce); }
.bandeau-page { background: var(--nuit) url(img/factory_slider_g.jpg) center / cover; position: relative; }
.bandeau-page::before { content: ""; position: absolute; inset: 0; background: rgba(10,20,35,.7); }
.bandeau-page h1 { position: relative; color: #fff; margin: 0; padding: 60px 0; font-size: 2.4rem; }

/* Promesses, metiers, secteurs, realisations */
.promesses { display: grid; grid-template-columns: repeat(auto-fit, minmax(280px, 1fr)); }
.promesse { padding: 44px 40px; color: #fff; background: var(--nuit) center / cover; position: relative; }
.promesse::before { content: ""; position: absolute; inset: 0; background: rgba(21,90,150,.85); }
.promesse:nth-child(2)::before { background: rgba(26,31,38,.85); }
.promesse > * { position: relative; }
.promesse h2 { color: #fff; font-size: 1.5rem; }
.promesse p { margin: 0; }
.grille-3 { display: grid; grid-template-columns: repeat(auto-fit, minmax(260px, 1fr)); gap: 28px; }
.carte { background: var(--blanc); box-shadow: 0 2px 10px rgba(0,0,0,.07); }
.carte img { width: 100%; aspect-ratio: 2 / 1; object-fit: cover; }
.carte h3, .carte h4 { padding: 18px 20px; margin: 0; font-size: 1.1rem; }
.carte small { font-weight: 400; color: var(--gris); font-size: .9rem; }
.carte.bloc { padding: 28px; }
.carte.bloc h3 { padding: 0 0 10px; }
.texte { max-width: 820px; margin: 0 auto; }
.note { text-align: center; margin: 40px auto 0; max-width: 640px; }
.secteurs { display: grid; grid-template-columns: repeat(4, 1fr); gap: 24px 16px; margin-top: 40px; }
.secteurs img { margin: 0 auto; width: 100%; max-width: 240px; }
.citation { background: var(--bleu); color: #fff; text-align: center; padding: 56px 20px; }
.citation blockquote { margin: 0 auto; max-width: 820px; font-size: 1.5rem; font-style: italic; }

/* Contact et documents */
.deux-col { display: grid; grid-template-columns: repeat(auto-fit, minmax(300px, 1fr)); gap: 40px; }
.coordonnees p { margin: 0 0 16px; }
.actions { display: flex; flex-wrap: wrap; gap: 12px; }
.documents { display: grid; gap: 20px; }
.document { display: flex; justify-content: space-between; align-items: center; gap: 20px; flex-wrap: wrap; padding: 24px; background: var(--fond); }
.document h3 { margin: 0 0 4px; }
.document p { margin: 0; color: var(--gris); }

/* Pied de page */
footer { background: var(--nuit); color: #bbb; font-size: .95rem; }
footer .contenu { display: grid; grid-template-columns: repeat(auto-fit, minmax(220px, 1fr)); gap: 32px; padding-top: 48px; padding-bottom: 32px; }
footer h4 { color: #fff; text-transform: uppercase; font-size: .95rem; letter-spacing: .05em; }
footer ul { list-style: none; margin: 0; padding: 0; }
footer li { padding: 3px 0; }
footer a { color: #fff; }
.copyright { border-top: 1px solid #333; text-align: center; padding: 16px 20px; font-size: .85rem; }

/* Mobile */
@media (max-width: 700px) {
  .section { padding: 44px 0; }
  .titre h2 { font-size: 1.5rem; }
  .barre .adresse, .badges { display: none; }
  .barre .contenu { justify-content: center; }
  .entete .contenu { justify-content: center; }
  .entete .logo img { width: 190px; }
  nav ul { padding: 0; justify-content: center; }
  nav a { padding: 13px 12px; font-size: .8rem; }
  .hero .contenu { padding-top: 70px; padding-bottom: 70px; }
  .hero p { font-size: 1.1rem; }
  .promesse { padding: 36px 24px; }
  .secteurs { grid-template-columns: repeat(2, 1fr); }
  .citation blockquote { font-size: 1.2rem; }
  .bandeau-page h1 { font-size: 1.9rem; padding: 44px 0; }
}