/* Fond global */
html, body {
  height: 100;
  margin: 0;
  font-family: 'Lato', sans-serif;
  color: white;
  background: radial-gradient(ellipse at bottom, #1B2735 0%, #090A0F 100%);
  overflow-x: hidden;
}

/* Les trois calques d’étoiles */
#stars, #stars2, #stars3 {
  position: fixed;  /* Fixé à l’écran, pas au contenu */
  top: 0;
  left: 0;
  width: 100%;
  height: 100%;
  content: "";
  background: transparent;
  z-index: 0;  /* derrière le contenu */
}

/* Étoiles petites */
#stars {
  width: 1px;
  height: 1px;
  box-shadow: 
    1234px 543px #FFF, 532px 1543px #FFF, 934px 1832px #FFF, 
    1823px 732px #FFF, 1453px 1232px #FFF, 453px 832px #FFF,
    1532px 345px #FFF, 1934px 523px #FFF, 245px 1243px #FFF;
  animation: animStar 50s linear infinite;
}

#stars::after {
  content: " ";
  position: absolute;
  top: 2000px;
  width: 1px;
  height: 1px;
  box-shadow: inherit;
}

/* Étoiles moyennes */
#stars2 {
  width: 2px;
  height: 2px;
  box-shadow: 
    432px 1324px #FFF, 932px 432px #FFF, 1723px 1432px #FFF, 
    132px 932px #FFF, 623px 523px #FFF, 1832px 232px #FFF;
  animation: animStar 100s linear infinite;
}

#stars2::after {
  content: " ";
  position: absolute;
  top: 2000px;
  width: 2px;
  height: 2px;
  box-shadow: inherit;
}

/* Étoiles grosses */
#stars3 {
  width: 3px;
  height: 3px;
  box-shadow: 
    532px 324px #FFF, 932px 1432px #FFF, 1832px 832px #FFF, 
    232px 132px #FFF, 723px 623px #FFF;
  animation: animStar 150s linear infinite;
}

#stars3::after {
  content: " ";
  position: absolute;
  top: 2000px;
  width: 3px;
  height: 3px;
  box-shadow: inherit;
}

/* Animation lente vers le haut */
@keyframes animStar {
  from { transform: translateY(0px); }
  to { transform: translateY(-2000px); }
}

/* Titre sur la page d’accueil */
#title {
  text-align: center;
  font-weight: 300;
  font-size: 50px;
  letter-spacing: 10px;
  z-index: 1;  /* devant les étoiles */
  position: relative;
}

#title span {
  background: -webkit-linear-gradient(white, #38495a);
  -webkit-background-clip: text;
  -webkit-text-fill-color: transparent;
}