/* Filigrane logo — fond discret, en couleur. Ajustez opacity (0.04–0.10) au besoin. */
body::before{
  content:"";
  position:fixed;
  inset:0;
  background-image:url('../img/logo.png');
  background-repeat:no-repeat;
  background-position:center center;
  background-size:min(46%,500px);
  opacity:0.06;
  pointer-events:none;
  z-index:-1;
}