:root { --fond: #fafafa; --texte: #1a1a1a; --discret: #666; --accent: #1f3864; }
@media (prefers-color-scheme: dark) {
  :root { --fond: #121417; --texte: #e8e8e8; --discret: #9a9a9a; --accent: #8fb0e8; }
}
* { box-sizing: border-box; }
body {
  margin: 0; min-height: 100vh; display: flex; flex-direction: column;
  justify-content: center; align-items: center; padding: 16px;
  background: var(--fond); color: var(--texte);
  font-family: system-ui, -apple-system, "Segoe UI", sans-serif; text-align: center;
}
nav { position: absolute; top: 16px; right: 16px; font-size: 0.9rem; }
nav a, nav span { margin-left: 0.6rem; }
nav span { font-weight: 600; }
a { color: var(--accent); }
h1 { margin: 0 0 0.3rem; font-size: 2rem; }
p { margin: 0.2rem 0; color: var(--discret); }