:root {
  --bg: #ffffff;
  --bg-alt: #f6f7f9;
  --ink: #0f172a;
  --mute: #475569;
  --line: #e2e8f0;
  --accent: #1d4ed8;
  --accent-ink: #ffffff;
  --ok: #047857;
  --err: #b91c1c;
  --radius: 14px;
  color-scheme: light dark;
}

@media (prefers-color-scheme: dark) {
  :root {
    --bg: #0b1120;
    --bg-alt: #111a2e;
    --ink: #e8edf5;
    --mute: #9aa8bd;
    --line: #22304a;
    --accent: #6d9bff;
    --accent-ink: #0b1120;
    --ok: #34d399;
    --err: #f87171;
  }
}

*, *::before, *::after { box-sizing: border-box; }

html { background: var(--bg); scroll-behavior: smooth; }

body {
  margin: 0;
  background: var(--bg);
  color: var(--ink);
  font: 16px/1.6 system-ui, -apple-system, "Segoe UI", Roboto, "Helvetica Neue", Arial, sans-serif;
  -webkit-font-smoothing: antialiased;
  min-height: 100vh;
  display: flex;
  flex-direction: column;
}

main { flex: 1; }

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

.wrap { width: 100%; max-width: 1040px; margin: 0 auto; padding: 0 20px; }
.narrow { max-width: 680px; }

/* Barre */
.bar {
  position: sticky; top: 0; z-index: 10;
  background: color-mix(in srgb, var(--bg) 88%, transparent);
  backdrop-filter: saturate(160%) blur(10px);
  -webkit-backdrop-filter: saturate(160%) blur(10px);
  border-bottom: 1px solid var(--line);
}
.bar-in { display: flex; align-items: center; justify-content: space-between; height: 64px; }
.brand { display: inline-flex; align-items: center; gap: 10px; font-weight: 650; color: var(--ink); text-decoration: none; }
.mark {
  display: inline-grid; place-items: center;
  width: 32px; height: 32px; border-radius: 8px;
  background: var(--ink); color: var(--bg);
  font-weight: 700; font-size: 17px;
}

/* Boutons */
.btn {
  display: inline-flex; align-items: center; justify-content: center;
  min-height: 44px; padding: 0 20px; border-radius: 10px;
  font: inherit; font-weight: 600; text-decoration: none;
  border: 1px solid transparent; cursor: pointer;
  transition: transform .15s ease, background-color .15s ease, border-color .15s ease;
}
.btn:active { transform: translateY(1px); }
.btn-primary { background: var(--accent); color: var(--accent-ink); }
.btn-primary:hover { filter: brightness(1.08); }
.btn-primary:disabled { opacity: .6; cursor: progress; }
.btn-ghost { color: var(--ink); border-color: var(--line); background: transparent; }
.btn-ghost:hover { border-color: var(--mute); }
:focus-visible { outline: 3px solid var(--accent); outline-offset: 2px; }

/* Héros */
.hero { padding: 88px 0 72px; }
.badge {
  display: inline-flex; align-items: center; gap: 8px;
  margin: 0 0 20px; padding: 6px 12px;
  border: 1px solid var(--line); border-radius: 999px;
  color: var(--mute); font-size: 14px;
}
.dot { width: 8px; height: 8px; border-radius: 50%; background: var(--ok); }
h1 {
  margin: 0 0 20px; max-width: 16ch;
  font-size: clamp(36px, 7vw, 60px); line-height: 1.08; letter-spacing: -0.025em;
}
.lead { margin: 0 0 32px; max-width: 58ch; font-size: clamp(17px, 2.2vw, 19px); color: var(--mute); }
.actions { display: flex; flex-wrap: wrap; gap: 12px; }

/* Sections */
.section { padding: 72px 0; }
.section-alt { background: var(--bg-alt); border-top: 1px solid var(--line); }
h2 { margin: 0 0 28px; font-size: clamp(26px, 4vw, 34px); line-height: 1.2; letter-spacing: -0.015em; }
.sub { margin: -16px 0 28px; color: var(--mute); }

.grid { display: grid; gap: 16px; grid-template-columns: repeat(auto-fit, minmax(240px, 1fr)); }
.card { padding: 24px; border: 1px solid var(--line); border-radius: var(--radius); background: var(--bg); }
.card h3 { margin: 8px 0 6px; font-size: 19px; }
.card p { margin: 0; color: var(--mute); }
.num { font-size: 13px; font-weight: 700; color: var(--accent); letter-spacing: .05em; }

/* Formulaire */
.form { display: grid; gap: 16px; }
.row { display: grid; gap: 16px; grid-template-columns: repeat(auto-fit, minmax(220px, 1fr)); }
.field { display: grid; gap: 6px; font-weight: 600; font-size: 15px; }
.field input, .field textarea {
  width: 100%; padding: 12px 14px;
  font: inherit; font-weight: 400; color: var(--ink);
  background: var(--bg); border: 1px solid var(--line); border-radius: 10px;
}
.field textarea { resize: vertical; min-height: 140px; }
.field input:focus, .field textarea:focus { outline: none; border-color: var(--accent); box-shadow: 0 0 0 3px color-mix(in srgb, var(--accent) 25%, transparent); }
.form .btn { justify-self: start; }
.hp { position: absolute; left: -10000px; width: 1px; height: 1px; overflow: hidden; }
.legal-note { margin: 0; font-size: 14px; color: var(--mute); }
.status { margin: 0; min-height: 1.6em; font-weight: 600; }
.status.ok { color: var(--ok); }
.status.err { color: var(--err); }

/* Pages de texte */
.prose h1 { font-size: clamp(30px, 5vw, 40px); }
.prose h2 { margin: 36px 0 10px; font-size: 21px; }
.prose p { margin: 0 0 12px; color: var(--mute); }
.prose strong { color: var(--ink); }

/* Pied */
.foot { border-top: 1px solid var(--line); color: var(--mute); font-size: 14px; }
.foot-in { display: flex; flex-wrap: wrap; gap: 8px 24px; justify-content: space-between; align-items: center; padding-top: 24px; padding-bottom: 24px; }
.foot p { margin: 0; }
.foot a { color: var(--mute); }

@media (max-width: 520px) {
  .wrap { padding: 0 16px; }
  .hero { padding: 56px 0 48px; }
  .section { padding: 56px 0; }
  .bar .btn-ghost { padding: 0 14px; }
}

@media (prefers-reduced-motion: reduce) {
  html { scroll-behavior: auto; }
  .btn { transition: none; }
}