/* Couleurs de l'application (contraste WCAG AA) : --teal porte du texte blanc (5,2:1) ;
   --brand, la teinte du logo, ne sert qu'au décor. */
:root {
  --teal: #137a6f;
  --brand: #1a9e8f;
  --teal-dark: #12756a;
  --orange: #e8a849;
  --bg: #f5f8fa;
  --ink: #1a1a2e;
  --muted: #5c6570;
  --card: #ffffff;
  --line: #e3e8ee;
}

* { box-sizing: border-box; }

html { scroll-behavior: smooth; }

body {
  margin: 0;
  font-family: "Segoe UI", system-ui, sans-serif;
  font-size: 18px;
  line-height: 1.55;
  color: var(--ink);
  background: var(--bg);
}

a { color: var(--teal-dark); }

a:focus-visible, .cta:focus-visible { outline: 3px solid var(--ink); outline-offset: 2px; }

header, main, footer { width: min(880px, calc(100% - 32px)); margin: 0 auto; }

header {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 16px;
  padding: 20px 0;
}

.brand { font-weight: 800; font-size: 22px; color: var(--ink); text-decoration: none; }

nav { display: flex; flex-wrap: wrap; gap: 8px 16px; }

nav a { text-decoration: none; font-weight: 600; min-height: 44px; display: inline-flex; align-items: center; }

.hero {
  background: var(--card);
  border-radius: 12px;
  padding: 32px 28px;
  box-shadow: 0 2px 8px rgba(0, 0, 0, 0.06);
}

.hero h1 { font-size: 36px; line-height: 1.2; margin: 0 0 12px; }

.lead { font-size: 20px; color: var(--muted); margin: 0 0 24px; }

.cta {
  display: inline-flex;
  align-items: center;
  min-height: 48px;
  padding: 0 20px;
  border-radius: 8px;
  background: var(--teal);
  color: white;
  font-weight: 700;
  text-decoration: none;
}

.cta.secondary { background: transparent; color: var(--teal-dark); border: 2px solid var(--teal); margin-left: 8px; }

.grid { display: grid; grid-template-columns: repeat(auto-fit, minmax(220px, 1fr)); gap: 16px; margin: 28px 0; }

.card {
  background: var(--card);
  border-radius: 12px;
  padding: 20px;
  border: 1px solid var(--line);
}

.card h2 { font-size: 20px; margin: 0 0 8px; }

.card p { margin: 0; color: var(--muted); }

section { margin: 36px 0; }

section h2 { font-size: 28px; margin: 0 0 12px; }

footer {
  padding: 28px 0 48px;
  color: var(--muted);
  font-size: 16px;
}

.prose h1 { font-size: 32px; line-height: 1.25; }
.prose h2 { font-size: 22px; margin-top: 28px; }
.prose p, .prose li { color: var(--ink); }
.prose ul { padding-left: 1.2em; }

@media (max-width: 640px) {
  .hero h1 { font-size: 30px; }
  .cta.secondary { margin: 12px 0 0; }
}