/* =========================================================================
   ROYALBOND — Vitrine institutionnelle
   Charte : bleu nuit #1F2A44 · or #C9A227 · fond clair #F4F3EE · texte #222831
   Titres serif (Cambria/Georgia) · corps sans-serif (Inter/Calibri/Arial)
   Site statique pur — aucune dépendance, aucun build.
   ========================================================================= */

:root {
  --bleu-nuit: #1F2A44;
  --bleu-nuit-2: #182037;
  --or: #C9A227;
  --or-clair: #E2C766;
  --fond: #F4F3EE;
  --fond-2: #FBFAF6;
  --texte: #222831;
  --texte-doux: #4A5160;
  --ligne: #E2DFD4;
  --serif: "Cambria", "Georgia", "Times New Roman", serif;
  --sans: "Inter", "Calibri", "Segoe UI", "Arial", sans-serif;
  --maxw: 1140px;
  --r: 4px;
  --shadow: 0 1px 3px rgba(31, 42, 68, .08), 0 8px 30px rgba(31, 42, 68, .06);
}

* { box-sizing: border-box; }

html { scroll-behavior: smooth; }

body {
  margin: 0;
  font-family: var(--sans);
  color: var(--texte);
  background: var(--fond);
  line-height: 1.65;
  font-size: 17px;
  -webkit-font-smoothing: antialiased;
}

h1, h2, h3, h4 {
  font-family: var(--serif);
  color: var(--bleu-nuit);
  line-height: 1.2;
  font-weight: 600;
  letter-spacing: .2px;
}

a { color: var(--bleu-nuit); text-decoration: none; }
a:hover { color: var(--or); }

.container { width: 100%; max-width: var(--maxw); margin: 0 auto; padding: 0 24px; }

/* ---- Bandeau réglementaire (haut de page) ---- */
.reg-bar {
  background: var(--bleu-nuit-2);
  color: #D8DCE6;
  font-size: 12.5px;
  letter-spacing: .3px;
  text-align: center;
  padding: 7px 16px;
}
.reg-bar strong { color: var(--or-clair); font-weight: 600; }

/* ---- En-tête / navigation ---- */
.site-header {
  position: sticky; top: 0; z-index: 50;
  background: rgba(244, 243, 238, .92);
  backdrop-filter: saturate(140%) blur(8px);
  border-bottom: 1px solid var(--ligne);
}
.nav {
  display: flex; align-items: center; justify-content: space-between;
  height: 72px;
}
.brand { display: flex; align-items: baseline; gap: 10px; }
.brand .mark {
  font-family: var(--serif); font-size: 22px; font-weight: 700;
  color: var(--bleu-nuit); letter-spacing: 1.5px;
}
.brand .mark b { color: var(--or); font-weight: 700; }
.brand .baseline {
  font-size: 12px; color: var(--texte-doux); letter-spacing: .5px;
  text-transform: uppercase;
}
.nav-links { display: flex; gap: 28px; align-items: center; }
.nav-links a {
  font-size: 14.5px; color: var(--texte-doux); font-weight: 500;
  letter-spacing: .2px;
}
.nav-links a:hover { color: var(--bleu-nuit); }
.btn {
  display: inline-block; font-family: var(--sans); font-size: 14.5px;
  font-weight: 600; letter-spacing: .3px; cursor: pointer;
  padding: 11px 22px; border-radius: var(--r); border: 1px solid transparent;
  transition: all .18s ease;
}
.btn-or { background: var(--or); color: #1A1405; }
.btn-or:hover { background: var(--or-clair); color: #1A1405; }
.btn-ghost { border-color: var(--bleu-nuit); color: var(--bleu-nuit); background: transparent; }
.btn-ghost:hover { background: var(--bleu-nuit); color: #fff; }

/* ---- Hero ---- */
.hero {
  background:
    radial-gradient(1200px 380px at 80% -10%, rgba(201,162,39,.16), transparent 60%),
    linear-gradient(180deg, var(--bleu-nuit) 0%, var(--bleu-nuit-2) 100%);
  color: #EDEFF4;
  padding: 96px 0 104px;
}
.hero .eyebrow {
  color: var(--or-clair); text-transform: uppercase; letter-spacing: 2.5px;
  font-size: 12.5px; font-weight: 600; margin: 0 0 20px;
}
.hero h1 { color: #fff; font-size: 50px; margin: 0 0 22px; max-width: 16ch; }
.hero h1 .gold { color: var(--or); }
.hero p.lede { font-size: 19px; color: #C7CCD8; max-width: 60ch; margin: 0 0 34px; }
.hero .cta-row { display: flex; gap: 14px; flex-wrap: wrap; }

/* ---- Sections ---- */
.section { padding: 80px 0; }
.section.alt { background: var(--fond-2); border-top: 1px solid var(--ligne); border-bottom: 1px solid var(--ligne); }
.section-head { max-width: 64ch; margin-bottom: 48px; }
.section-head .eyebrow {
  color: var(--or); text-transform: uppercase; letter-spacing: 2px;
  font-size: 12.5px; font-weight: 700; margin: 0 0 14px;
}
.section-head h2 { font-size: 34px; margin: 0 0 16px; }
.section-head p { color: var(--texte-doux); font-size: 18px; margin: 0; }

/* ---- Étapes du modèle ---- */
.steps { display: grid; grid-template-columns: repeat(3, 1fr); gap: 24px; }
.step {
  background: #fff; border: 1px solid var(--ligne); border-radius: var(--r);
  padding: 30px 26px; box-shadow: var(--shadow);
}
.step .num {
  font-family: var(--serif); font-size: 15px; font-weight: 700;
  color: var(--or); border: 1.5px solid var(--or); border-radius: 50%;
  width: 38px; height: 38px; display: flex; align-items: center; justify-content: center;
  margin-bottom: 18px;
}
.step h3 { font-size: 20px; margin: 0 0 10px; }
.step p { color: var(--texte-doux); font-size: 15.5px; margin: 0; }

/* ---- Bloc chiffres (hypothèses) ---- */
.kpis { display: grid; grid-template-columns: repeat(3, 1fr); gap: 24px; }
.kpi {
  text-align: center; padding: 28px 18px;
  border: 1px solid var(--ligne); border-radius: var(--r); background: #fff;
}
.kpi .v { font-family: var(--serif); font-size: 34px; color: var(--bleu-nuit); font-weight: 700; }
.kpi .v small { font-size: 18px; color: var(--or); }
.kpi .l { font-size: 14px; color: var(--texte-doux); margin-top: 6px; }
.hyp-note {
  margin-top: 22px; font-size: 13.5px; color: var(--texte-doux); font-style: italic;
  text-align: center;
}

/* ---- Deux colonnes (public cible) ---- */
.split { display: grid; grid-template-columns: 1fr 1fr; gap: 28px; }
.panel {
  background: #fff; border: 1px solid var(--ligne); border-radius: var(--r);
  padding: 34px 32px; box-shadow: var(--shadow);
}
.panel h3 { font-size: 22px; margin: 0 0 12px; }
.panel ul { margin: 16px 0 24px; padding-left: 18px; color: var(--texte-doux); }
.panel li { margin-bottom: 8px; }

/* ---- Encart d'avertissement ---- */
.notice {
  border-left: 3px solid var(--or); background: #FBF7EA;
  padding: 18px 22px; border-radius: 0 var(--r) var(--r) 0;
  font-size: 14.5px; color: #5A4A1E; margin: 28px 0;
}

/* ---- Pied de page ---- */
.site-footer {
  background: var(--bleu-nuit); color: #AEB5C4; padding: 56px 0 28px;
  font-size: 14px;
}
.footer-grid { display: grid; grid-template-columns: 2fr 1fr 1fr; gap: 32px; margin-bottom: 36px; }
.site-footer h4 { color: #fff; font-size: 14px; text-transform: uppercase; letter-spacing: 1.2px; margin: 0 0 14px; }
.site-footer a { color: #AEB5C4; display: block; margin-bottom: 8px; }
.site-footer a:hover { color: var(--or-clair); }
.footer-brand .mark { font-family: var(--serif); font-size: 20px; color: #fff; letter-spacing: 1.5px; }
.footer-brand .mark b { color: var(--or); }
.legal {
  border-top: 1px solid rgba(255,255,255,.12); padding-top: 22px;
  font-size: 12.5px; color: #8A92A4; line-height: 1.7;
}
.legal strong { color: #C7CCD8; }

/* ---- Responsive ---- */
@media (max-width: 860px) {
  .nav-links { display: none; }
  .hero h1 { font-size: 36px; }
  .steps, .kpis, .split, .footer-grid { grid-template-columns: 1fr; }
  .section { padding: 56px 0; }
}