/* =========================================================================
   ALTAGROUPE — Feuille de style principale
   Style : institutionnel sobre (bleu nuit / gris), sans dépendance externe.
   Aucune police web, aucun script tiers : robustesse et performance maximales.
   ========================================================================= */

/* ---------- 1. Jetons de design (design tokens) ---------- */
:root {
  /* Couleurs de marque */
  --navy-900: #0c1f38;
  --navy-800: #10294a;
  --navy-700: #163458;
  --navy-600: #1d4276;
  --navy-500: #2a5a97;

  --ink: #16202e;          /* texte principal */
  --slate: #3d4a5c;        /* texte secondaire */
  --muted: #667586;        /* texte tertiaire / légendes */
  --line: #e4e9f0;         /* filets, bordures */
  --line-strong: #cdd7e3;

  --bg: #ffffff;
  --bg-alt: #f5f8fc;       /* sections claires */
  --bg-navy: var(--navy-900);

  --gold: #b4924f;         /* accent décoratif discret */
  --gold-soft: #d8c39a;

  --link: #1d4276;
  --link-hover: #0c1f38;

  /* Alertes (page Avertissement) */
  --danger: #a5271b;
  --danger-ink: #7a1c13;
  --danger-bg: #fdf3f1;
  --danger-border: #f1c9c2;
  --warn: #8a5a12;
  --warn-bg: #fdf6e9;
  --warn-border: #eddcb6;
  --safe: #1f6b45;
  --safe-bg: #eef7f1;
  --safe-border: #c3e2ce;

  /* Typographie */
  --serif: "Iowan Old Style", "Palatino Linotype", Palatino, Georgia, "Times New Roman", serif;
  --sans: -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, Helvetica, Arial, "Helvetica Neue", sans-serif;

  /* Rythme & mesures */
  --container: 1140px;
  --container-narrow: 760px;
  --radius: 6px;
  --radius-lg: 12px;
  --shadow-sm: 0 1px 2px rgba(16, 41, 74, 0.06);
  --shadow-md: 0 6px 24px rgba(16, 41, 74, 0.08);
  --shadow-lg: 0 18px 50px rgba(12, 31, 56, 0.14);

  --space-1: 0.375rem;
  --space-2: 0.75rem;
  --space-3: 1.25rem;
  --space-4: 2rem;
  --space-5: 3rem;
  --space-6: 4.5rem;
  --space-7: 6.5rem;
}

/* ---------- 2. Base ---------- */
*,
*::before,
*::after { box-sizing: border-box; }

html {
  -webkit-text-size-adjust: 100%;
  scroll-behavior: smooth;
  scroll-padding-top: 90px;
}

body {
  margin: 0;
  font-family: var(--sans);
  font-size: 1.0625rem;      /* 17px */
  line-height: 1.7;
  color: var(--ink);
  background: var(--bg);
  -webkit-font-smoothing: antialiased;
  text-rendering: optimizeLegibility;
}

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

h1, h2, h3, h4 {
  font-family: var(--serif);
  color: var(--navy-900);
  line-height: 1.18;
  font-weight: 600;
  margin: 0 0 0.6em;
  letter-spacing: -0.01em;
}
h1 { font-size: clamp(2rem, 1.4rem + 2.6vw, 3rem); }
h2 { font-size: clamp(1.55rem, 1.2rem + 1.4vw, 2.15rem); }
h3 { font-size: 1.3rem; }
h4 { font-size: 1.08rem; font-family: var(--sans); font-weight: 700; letter-spacing: 0; }

p { margin: 0 0 1.1em; }
strong { color: var(--navy-800); }

a { color: var(--link); text-decoration: underline; text-underline-offset: 2px; text-decoration-thickness: 1px; transition: color .15s ease; }
a:hover { color: var(--link-hover); }

ul, ol { margin: 0 0 1.2em; padding-left: 1.3em; }
li { margin-bottom: 0.5em; }

hr { border: 0; border-top: 1px solid var(--line); margin: var(--space-5) 0; }

:focus-visible {
  outline: 3px solid var(--navy-500);
  outline-offset: 2px;
  border-radius: 3px;
}

/* ---------- 3. Utilitaires de mise en page ---------- */
.container { width: 100%; max-width: var(--container); margin-inline: auto; padding-inline: clamp(1.1rem, 4vw, 2.2rem); }
.narrow { max-width: var(--container-narrow); }

.section { padding-block: var(--space-6); }
.section--alt { background: var(--bg-alt); border-block: 1px solid var(--line); }
.section--navy { background: var(--bg-navy); color: #dbe6f2; }
.section--tight { padding-block: var(--space-5); }

.eyebrow {
  display: inline-block;
  font-family: var(--sans);
  font-size: 0.75rem;
  font-weight: 700;
  letter-spacing: 0.16em;
  text-transform: uppercase;
  color: var(--gold);
  margin-bottom: 0.9rem;
}
.section--navy .eyebrow { color: var(--gold-soft); }

.lead { font-size: 1.2rem; line-height: 1.6; color: var(--slate); }
.section--navy .lead { color: #c2d2e6; }
.muted { color: var(--muted); }
.center { text-align: center; }
.max-prose { max-width: 68ch; }
.mx-auto { margin-inline: auto; }

.gold-rule { width: 54px; height: 3px; background: var(--gold); border: 0; margin: 0 0 1.6rem; }
.center .gold-rule { margin-inline: auto; }

/* ---------- 4. Skip link ---------- */
.skip {
  position: absolute; left: -9999px; top: 0; z-index: 200;
  background: var(--navy-900); color: #fff; padding: .8rem 1.2rem;
  text-decoration: none; border-radius: 0 0 var(--radius) 0;
}
.skip:focus { left: 0; }

/* ---------- 5. En-tête & navigation ---------- */
.site-header {
  position: sticky; top: 0; z-index: 100;
  background: rgba(255,255,255,0.92);
  backdrop-filter: saturate(140%) blur(8px);
  border-bottom: 1px solid var(--line);
}
.header-inner { display: flex; align-items: center; justify-content: space-between; gap: 1.5rem; min-height: 72px; }

.brand { display: inline-flex; align-items: center; gap: 0.7rem; text-decoration: none; color: var(--navy-900); }
.brand:hover { color: var(--navy-900); }
.brand-emblem { width: 38px; height: 38px; flex: 0 0 auto; }
.brand-text { display: flex; flex-direction: column; line-height: 1.05; }
.brand-text strong { font-family: var(--serif); font-size: 1.24rem; font-weight: 600; letter-spacing: 0.02em; color: var(--navy-900); white-space: nowrap; }
.brand-text span { font-size: 0.68rem; letter-spacing: 0.14em; text-transform: uppercase; color: var(--muted); font-weight: 600; white-space: nowrap; }

.site-nav { display: flex; align-items: center; gap: 1.7rem; }
.site-nav a { color: var(--slate); text-decoration: none; font-weight: 600; font-size: 0.97rem; padding: 0.4rem 0; position: relative; }
.site-nav a:not(.lang-link):hover { color: var(--navy-900); }
.site-nav a[aria-current="page"] { color: var(--navy-900); }
.site-nav a[aria-current="page"]::after {
  content: ""; position: absolute; left: 0; right: 0; bottom: -2px; height: 2px; background: var(--gold);
}
.lang-link {
  border: 1px solid var(--line-strong); border-radius: 999px;
  padding: 0.32rem 0.85rem !important; font-size: 0.8rem !important;
  letter-spacing: 0.06em; color: var(--navy-700) !important; text-transform: uppercase;
}
.lang-link:hover { background: var(--navy-900); color: #fff !important; border-color: var(--navy-900); }

.nav-toggle {
  display: none; align-items: center; gap: .5rem;
  background: transparent; border: 1px solid var(--line-strong);
  color: var(--navy-800); font-weight: 600; font-size: .92rem;
  padding: .5rem .9rem; border-radius: var(--radius); cursor: pointer;
}
.nav-toggle:hover { background: var(--bg-alt); }

/* ---------- 6. Boutons ---------- */
.btn {
  display: inline-flex; align-items: center; gap: .55rem;
  font-family: var(--sans); font-weight: 600; font-size: 0.98rem;
  padding: 0.85rem 1.5rem; border-radius: var(--radius);
  text-decoration: none; cursor: pointer; border: 1px solid transparent;
  transition: transform .05s ease, background .15s ease, border-color .15s ease, color .15s ease;
}
.btn:active { transform: translateY(1px); }
.btn--primary { background: var(--navy-800); color: #fff; }
.btn--primary:hover { background: var(--navy-900); color: #fff; }
.btn--ghost { background: transparent; color: var(--navy-800); border-color: var(--line-strong); }
.btn--ghost:hover { border-color: var(--navy-800); background: var(--bg-alt); color: var(--navy-900); }
.btn--light { background: #fff; color: var(--navy-900); }
.btn--light:hover { background: #eef3f9; color: var(--navy-900); }
.btn--on-navy-ghost { background: transparent; color: #fff; border-color: rgba(255,255,255,.35); }
.btn--on-navy-ghost:hover { border-color: #fff; background: rgba(255,255,255,.08); color: #fff; }
.btn-row { display: flex; flex-wrap: wrap; gap: 0.9rem; margin-top: 1.6rem; }

/* ---------- 7. Hero ---------- */
.hero {
  position: relative;
  background:
    radial-gradient(1200px 500px at 80% -10%, rgba(45,90,151,0.55), transparent 60%),
    linear-gradient(160deg, var(--navy-900) 0%, var(--navy-800) 55%, #0a1a30 100%);
  color: #eaf1f9;
  overflow: hidden;
}
.hero::after {
  content: ""; position: absolute; inset: 0;
  background-image: linear-gradient(rgba(255,255,255,0.035) 1px, transparent 1px),
                    linear-gradient(90deg, rgba(255,255,255,0.035) 1px, transparent 1px);
  background-size: 46px 46px; opacity: .5; pointer-events: none;
}
.hero-inner { position: relative; z-index: 1; padding-block: var(--space-7); max-width: 820px; }
.hero h1 { color: #fff; }
.hero .lead { color: #c8d7e8; }
.hero .eyebrow { color: var(--gold-soft); }
/* Sur fond sombre, le texte en gras doit rester clair (sinon illisible) */
.hero strong,
.section--navy strong,
.section--navy .lead strong,
.cta-band strong,
.alert-banner strong { color: #ffffff; }
.hero-gold { width: 54px; height: 3px; background: var(--gold); border: 0; margin-bottom: 1.6rem; }

/* ---------- 8. Grilles & cartes ---------- */
.grid { display: grid; gap: 1.5rem; }
.grid-2 { grid-template-columns: repeat(2, 1fr); }
.grid-3 { grid-template-columns: repeat(3, 1fr); }

.card {
  background: #fff; border: 1px solid var(--line);
  border-radius: var(--radius-lg); padding: 1.8rem;
  box-shadow: var(--shadow-sm); height: 100%;
}
.card--pad-lg { padding: 2.2rem; }
.card h3 { margin-bottom: .5rem; }
.card .card-kicker { font-size: .74rem; letter-spacing: .13em; text-transform: uppercase; font-weight: 700; color: var(--gold); }
.card p:last-child { margin-bottom: 0; }
.card--link { text-decoration: none; color: inherit; display: block; transition: box-shadow .18s ease, transform .18s ease, border-color .18s ease; }
.card--link:hover { box-shadow: var(--shadow-md); transform: translateY(-3px); border-color: var(--line-strong); color: inherit; }
.card-more { display: inline-block; margin-top: 1rem; font-weight: 600; color: var(--link); }

/* Filiale */
.subsidiary { display: flex; flex-direction: column; }
.subsidiary .sub-name { font-family: var(--serif); font-size: 1.5rem; color: var(--navy-900); margin: .2rem 0 .1rem; }
.subsidiary .sub-tag { font-size: .82rem; letter-spacing: .08em; text-transform: uppercase; color: var(--muted); font-weight: 600; margin-bottom: 1rem; }

/* ---------- 9. Encarts (callouts) ---------- */
.callout {
  border: 1px solid var(--line-strong); border-left: 4px solid var(--navy-600);
  background: var(--bg-alt); border-radius: var(--radius);
  padding: 1.4rem 1.6rem; margin: 1.8rem 0;
}
.callout h3, .callout h4 { margin-top: 0; }
.callout p:last-child { margin-bottom: 0; }

.callout--danger { border-color: var(--danger-border); border-left-color: var(--danger); background: var(--danger-bg); }
.callout--danger h3, .callout--danger h4, .callout--danger strong { color: var(--danger-ink); }
.callout--warn { border-color: var(--warn-border); border-left-color: var(--warn); background: var(--warn-bg); }
.callout--warn h3, .callout--warn h4 { color: var(--warn); }
.callout--safe { border-color: var(--safe-border); border-left-color: var(--safe); background: var(--safe-bg); }
.callout--safe h3, .callout--safe h4 { color: var(--safe); }

.callout-icon { display:inline-flex; align-items:center; gap:.6rem; }
.callout-icon svg { flex: 0 0 auto; }

/* Bandeau d'alerte pleine largeur (page Avertissement) */
.alert-banner {
  background: var(--danger); color: #fff;
}
.alert-banner .container { display: flex; gap: 1rem; align-items: flex-start; padding-block: 1.1rem; }
.alert-banner svg { flex: 0 0 auto; margin-top: 2px; }
.alert-banner strong { color: #fff; }
.alert-banner p { margin: 0; color: #ffe9e6; font-size: .98rem; }

/* ---------- 10. Listes enrichies ---------- */
.feature-list { list-style: none; padding: 0; margin: 0; }
.feature-list li { position: relative; padding-left: 2rem; margin-bottom: 1rem; }
.feature-list li::before {
  content: ""; position: absolute; left: 0; top: .55em;
  width: 10px; height: 10px; background: var(--gold); border-radius: 2px; transform: rotate(45deg);
}

.check-list { list-style: none; padding: 0; margin: 1.2rem 0; }
.check-list li { position: relative; padding-left: 2.1rem; margin-bottom: .9rem; }
.check-list li::before {
  content: "✓"; position: absolute; left: 0; top: 0;
  color: var(--safe); font-weight: 800; font-size: 1.05rem;
}
.cross-list { list-style: none; padding: 0; margin: 1.2rem 0; }
.cross-list li { position: relative; padding-left: 2.1rem; margin-bottom: .9rem; }
.cross-list li::before {
  content: "✕"; position: absolute; left: 0; top: 0;
  color: var(--danger); font-weight: 800; font-size: 1.05rem;
}

/* Étapes numérotées */
.steps { list-style: none; counter-reset: step; padding: 0; margin: 1.5rem 0 0; display: grid; gap: 1.1rem; }
.steps li { position: relative; padding: 1.2rem 1.4rem 1.2rem 3.6rem; counter-increment: step; background: #fff; border: 1px solid var(--line); border-radius: var(--radius); }
.steps li::before {
  content: counter(step); position: absolute; left: 1rem; top: 1.1rem;
  width: 1.9rem; height: 1.9rem; background: var(--navy-800); color: #fff;
  border-radius: 50%; display: grid; place-items: center; font-weight: 700; font-size: .95rem; font-family: var(--sans);
}
.steps li > strong { display: block; margin-bottom: .2rem; color: var(--navy-900); }
.steps li p { margin: 0; }

/* ---------- 11. Répertoire de contacts officiels ---------- */
.resource-grid { display: grid; grid-template-columns: repeat(2, 1fr); gap: 1.2rem; margin-top: 1.5rem; }
.resource {
  border: 1px solid var(--line); border-radius: var(--radius-lg); padding: 1.3rem 1.4rem; background: #fff;
}
.resource h4 { margin: 0 0 .3rem; color: var(--navy-900); }
.resource .resource-role { font-size: .9rem; color: var(--muted); margin-bottom: .7rem; }
.resource .resource-meta { font-size: .93rem; margin: .25rem 0; }
.resource .resource-meta a { font-weight: 600; }
.resource .tel { font-variant-numeric: tabular-nums; font-weight: 700; color: var(--navy-800); }

/* ---------- 12. Tableau d'informations (mentions légales) ---------- */
.info-table { width: 100%; border-collapse: collapse; margin: 1.4rem 0; font-size: .98rem; }
.info-table th, .info-table td { text-align: left; padding: .85rem 1rem; border-bottom: 1px solid var(--line); vertical-align: top; }
.info-table th { width: 34%; color: var(--navy-800); font-weight: 700; background: var(--bg-alt); }
.info-table tr:last-child th, .info-table tr:last-child td { border-bottom: 0; }
.table-wrap { overflow-x: auto; }

/* Marqueur "à compléter" pour l'exploitant du site */
.todo {
  background: #fff5d6; color: #7a5b00; border: 1px dashed #d9b84c;
  padding: 0.05em 0.45em; border-radius: 4px; font-size: .92em; font-weight: 600;
  font-family: var(--sans);
}

/* ---------- 13. Fil d'Ariane ---------- */
.breadcrumb { font-size: .86rem; color: var(--muted); padding-top: 1.4rem; }
.breadcrumb a { color: var(--muted); text-decoration: none; }
.breadcrumb a:hover { color: var(--navy-800); text-decoration: underline; }
.breadcrumb span { margin-inline: .4rem; }

/* Page légale : titrage de contenu long */
.legal-body h2 { margin-top: 2.4rem; padding-top: 1.2rem; border-top: 1px solid var(--line); }
.legal-body h2:first-of-type { border-top: 0; padding-top: 0; margin-top: 1.4rem; }
.legal-body h3 { margin-top: 1.6rem; }
.legal-meta { color: var(--muted); font-size: .9rem; }

/* ---------- 14. CTA bandeau ---------- */
.cta-band { background: var(--bg-navy); color: #fff; text-align: center; }
.cta-band h2 { color: #fff; }
.cta-band p { color: #c2d2e6; max-width: 60ch; margin-inline: auto; }

/* ---------- 15. Pied de page ---------- */
.site-footer { background: var(--navy-900); color: #a9bcd2; padding-block: var(--space-5) var(--space-4); font-size: .95rem; }
.footer-grid { display: grid; grid-template-columns: 1.5fr 1fr 1fr 1fr; gap: 2rem; }
.footer-brand { display: flex; align-items: center; gap: .6rem; margin-bottom: .9rem; }
.footer-brand .brand-emblem { width: 32px; height: 32px; }
.footer-brand strong { font-family: var(--serif); color: #fff; font-size: 1.15rem; letter-spacing: .02em; }
.site-footer p { margin: 0 0 .5rem; }
.footer-warn { color: var(--gold-soft); font-weight: 600; }
.site-footer h3 { color: #fff; font-family: var(--sans); font-size: .82rem; letter-spacing: .12em; text-transform: uppercase; margin: 0 0 .9rem; }
.site-footer nav { display: flex; flex-direction: column; gap: .55rem; }
.site-footer nav a { color: #a9bcd2; text-decoration: none; }
.site-footer nav a:hover { color: #fff; text-decoration: underline; }
.footer-bottom { display: flex; justify-content: space-between; gap: 1rem; flex-wrap: wrap; margin-top: var(--space-4); padding-top: 1.4rem; border-top: 1px solid rgba(255,255,255,.12); font-size: .85rem; color: #7f96b0; }
.footer-bottom a { color: #a9bcd2; }

/* ---------- 16. Divers ---------- */
.two-col { display: grid; grid-template-columns: 1.1fr .9fr; gap: 3rem; align-items: start; }
.stat-row { display: flex; flex-wrap: wrap; gap: 2.5rem; margin-top: 1.5rem; }
.stat .stat-num { font-family: var(--serif); font-size: 2rem; color: var(--navy-900); line-height: 1; }
.stat .stat-label { font-size: .9rem; color: var(--muted); }

.tag { display: inline-block; font-size: .74rem; font-weight: 700; letter-spacing: .08em; text-transform: uppercase; color: var(--navy-700); background: #eaf1fa; border: 1px solid #d6e3f2; padding: .2rem .6rem; border-radius: 999px; }

/* ---------- 17. Responsive ---------- */
@media (max-width: 860px) {
  .nav-toggle { display: inline-flex; }
  .site-nav {
    position: absolute; top: 100%; left: 0; right: 0;
    flex-direction: column; align-items: flex-start; gap: 0;
    background: #fff; border-bottom: 1px solid var(--line); box-shadow: var(--shadow-md);
    padding: .5rem 0; display: none;
  }
  .site-nav.is-open { display: flex; }
  .site-nav a { width: 100%; padding: .85rem clamp(1.1rem, 4vw, 2.2rem); }
  .site-nav a[aria-current="page"]::after { display: none; }
  .site-nav a[aria-current="page"] { border-left: 3px solid var(--gold); }
  .lang-link { margin: .6rem clamp(1.1rem, 4vw, 2.2rem); width: auto !important; display: inline-block; }
  .header-inner { position: relative; }

  .grid-2, .grid-3 { grid-template-columns: 1fr; }
  .two-col { grid-template-columns: 1fr; gap: 2rem; }
  .resource-grid { grid-template-columns: 1fr; }
  .footer-grid { grid-template-columns: 1fr 1fr; gap: 1.6rem; }
}
@media (max-width: 520px) {
  .footer-grid { grid-template-columns: 1fr; }
  .footer-bottom { flex-direction: column; }
  .info-table th { width: 42%; }
}

@media (prefers-reduced-motion: reduce) {
  * { scroll-behavior: auto !important; transition: none !important; animation: none !important; }
}

/* ---------- 18. Impression ---------- */
@media print {
  .site-header, .site-footer, .nav-toggle, .cta-band, .btn-row, .alert-banner { display: none !important; }
  body { color: #000; font-size: 11pt; }
  a { color: #000; text-decoration: underline; }
  .hero { background: none; color: #000; }
  .hero h1, .hero .lead { color: #000; }
  .section { padding-block: 1rem; }
}