/* Typographie et couleurs */
body {
  font-family: 'Open Sans', Arial, sans-serif;
  line-height: 1.6;
  color: #333;
  background-color: #f9f9f9;
  margin: 0;
  padding: 0;
}

/* En-tête */
header {
  background: #004080;
  color: #fff;
  padding: 20px;
  text-align: center;
}
header h1 {
  font-size: 2rem;
  margin: 0;
}

/* Navigation */
nav {
  background: #0066cc;
  display: flex;
  justify-content: center;
}
nav a {
  color: #fff;
  text-decoration: none;
  padding: 12px 20px;
  transition: background 0.3s;
}
nav a:hover {
  background: #004080;
}

/* Contenu principal */
main {
  max-width: 900px;
  margin: 20px auto;
  padding: 20px;
  background: #fff;
  border-radius: 6px;
  box-shadow: 0 2px 6px rgba(0,0,0,0.1);
}
main h2 {
  color: #0066cc;
  margin-top: 0;
}

/* Liens */
a {
  color: #0066cc;
}
a:hover {
  text-decoration: underline;
}

/* Pied de page */
footer {
  background: #004080;
  color: #fff;
  text-align: center;
  padding: 15px;
  margin-top: 40px;
}