@keyframes page-arrival {
  0% {
    opacity: 0;
  }

  68% {
    opacity: 1;
  }

  100% {
    opacity: 1;
  }
}

@keyframes page-departure {
  to {
    opacity: 0;
  }
}

@keyframes explorer-glow {
  0%, 100% {
    transform: translate3d(-4%, 0, 0) scale(1);
    opacity: 0.22;
  }

  50% {
    transform: translate3d(5%, 0, 0) scale(1.08);
    opacity: 0.42;
  }
}

body {
  animation: page-arrival 720ms cubic-bezier(0.22, 1, 0.36, 1) both;
}

/* La lueur décorative sort volontairement de l'écran : elle ne doit pas
   agrandir la page ni créer de défilement horizontal. */
html,
body {
  overflow-x: hidden;
}

body::before {
  position: fixed;
  z-index: -1;
  inset: auto -18vw 0 auto;
  width: min(48vw, 620px);
  aspect-ratio: 1;
  border-radius: 50%;
  background: radial-gradient(circle, rgba(242, 179, 64, 0.18), rgba(242, 179, 64, 0) 68%);
  content: "";
  pointer-events: none;
  transform-origin: bottom right;
  animation: explorer-glow 10s ease-in-out infinite;
}

body.is-leaving {
  pointer-events: none;
  animation: page-departure 300ms cubic-bezier(0.4, 0, 1, 1) both;
}

@media (prefers-reduced-motion: reduce) {
  body,
  body.is-leaving,
  body::before {
    animation: none;
  }
}