/* Orion Systems — feuille de style du site vitrine
   Couleurs reprises du logo : fond nuit #04121b, bleu nuit #0b2540, bleu clair #3a8fd9. */

:root {
  --nuit: #04121b;
  --nuit-2: #0b2540;
  --bleu: #3a8fd9;
  --bleu-clair: #8cc4f2;
  --texte: #1d2733;
  --texte-doux: #5b6773;
  --fond: #f5f8fb;
  --carte: #ffffff;
  --bord: #dde5ee;
  --rayon: 14px;
  --largeur: 1080px;
}

* { box-sizing: border-box; }

html { scroll-behavior: smooth; }

body {
  margin: 0;
  font-family: system-ui, -apple-system, "Segoe UI", Roboto, Arial, sans-serif;
  font-size: 17px;
  line-height: 1.6;
  color: var(--texte);
  background: var(--fond);
}

img { max-width: 100%; height: auto; display: block; }

a { color: var(--bleu); }

.conteneur {
  width: 100%;
  max-width: var(--largeur);
  margin: 0 auto;
  padding: 0 20px;
}

/* ---------- En-tête ---------- */

.entete {
  background: var(--nuit);
  position: sticky;
  top: 0;
  z-index: 10;
  border-bottom: 1px solid rgba(255, 255, 255, 0.06);
}

.entete .conteneur {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 16px;
  min-height: 64px;
}

.marque {
  display: flex;
  align-items: center;
  gap: 10px;
  color: #fff;
  text-decoration: none;
  font-weight: 700;
  letter-spacing: 1.5px;
  font-size: 15px;
}

.marque img { width: 36px; }

.nav { display: flex; gap: 22px; flex-wrap: wrap; }

.nav a {
  color: #c9d6e2;
  text-decoration: none;
  font-size: 15px;
}

.nav a:hover { color: #fff; }

/* ---------- Bandeau d'accueil ---------- */

.hero {
  background: radial-gradient(ellipse at top, #0f2f50 0%, var(--nuit) 70%);
  color: #fff;
  padding: 72px 0 84px;
  text-align: center;
}

.hero img { width: 160px; margin: 0 auto 24px; }

.hero h1 {
  margin: 0;
  font-size: clamp(32px, 6vw, 54px);
  letter-spacing: 3px;
  font-weight: 800;
}

.hero .slogan {
  margin: 8px 0 28px;
  color: var(--bleu);
  letter-spacing: 6px;
  font-size: 14px;
  text-transform: uppercase;
}

.hero p.intro {
  max-width: 640px;
  margin: 0 auto 32px;
  color: #c9d6e2;
  font-size: 19px;
}

.bouton {
  display: inline-block;
  background: var(--bleu);
  color: #fff;
  text-decoration: none;
  padding: 12px 26px;
  border-radius: 999px;
  font-weight: 600;
}

.bouton:hover { background: #2f7cc0; }

.bouton.secondaire {
  background: transparent;
  border: 1px solid rgba(255, 255, 255, 0.35);
  margin-left: 8px;
}

.bouton.secondaire:hover { border-color: #fff; }

/* ---------- Sections ---------- */

section { padding: 72px 0; }

section h2 {
  margin: 0 0 8px;
  font-size: clamp(26px, 4vw, 34px);
  color: var(--nuit-2);
}

.chapeau {
  margin: 0 0 36px;
  color: var(--texte-doux);
  max-width: 680px;
}

.grille {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(290px, 1fr));
  gap: 24px;
}

.carte {
  background: var(--carte);
  border: 1px solid var(--bord);
  border-radius: var(--rayon);
  padding: 28px;
}

.carte h3 { margin: 0 0 6px; font-size: 22px; color: var(--nuit-2); }

.etiquette {
  display: inline-block;
  font-size: 13px;
  font-weight: 600;
  padding: 3px 10px;
  border-radius: 999px;
  margin-bottom: 14px;
}

.etiquette.service { background: #e3f4ea; color: #1d7a45; }
.etiquette.dev { background: #e6f0fb; color: #2468a8; }

.carte ul { margin: 14px 0 0; padding-left: 20px; }
.carte li { margin-bottom: 6px; }

.alt { background: #fff; border-top: 1px solid var(--bord); border-bottom: 1px solid var(--bord); }

.atouts .carte h3 { font-size: 18px; }
.atouts .carte p { margin: 0; color: var(--texte-doux); }

/* ---------- Contact ---------- */

.contact {
  background: var(--nuit);
  color: #fff;
  text-align: center;
}

.contact h2 { color: #fff; }
.contact .chapeau { color: #c9d6e2; margin-left: auto; margin-right: auto; }

.contact .coordonnees {
  margin-top: 28px;
  color: #c9d6e2;
  font-size: 16px;
}

.contact .coordonnees a { color: var(--bleu-clair); text-decoration: none; }

/* ---------- Pied de page ---------- */

.pied {
  background: #020b11;
  color: #8796a5;
  font-size: 14px;
  padding: 24px 0;
}

.pied .conteneur {
  display: flex;
  justify-content: space-between;
  flex-wrap: wrap;
  gap: 12px;
}

.pied a { color: #b6c3cf; text-decoration: none; margin-left: 16px; }
.pied a:first-child { margin-left: 0; }

/* ---------- Pages de texte (mentions, confidentialité) ---------- */

.page-texte { padding: 56px 0 72px; }
.page-texte .conteneur { max-width: 780px; }
.page-texte h1 { color: var(--nuit-2); font-size: clamp(28px, 5vw, 38px); margin-top: 0; }
.page-texte h2 { font-size: 21px; margin: 32px 0 8px; }
.page-texte .maj { color: var(--texte-doux); font-size: 15px; }

/* ---------- Mobile ---------- */

@media (max-width: 640px) {
  body { font-size: 16px; }
  .nav { gap: 14px; }
  .nav a { font-size: 14px; }
  .nav .masquer-mobile { display: none; }
  .hero { padding: 48px 0 60px; }
  .hero img { width: 120px; }
  .bouton.secondaire { margin: 12px 0 0; }
  section { padding: 52px 0; }
  .pied .conteneur { flex-direction: column; }
}