html, body {
  margin: 0;
  padding: 0;
  overflow: hidden; /* coupe scroll horizontal + vertical */
  width: 100%;
  height: 100%;
}

.fond-hall {
  position: relative;
  min-height: 100vh;
  background: url("../images/fonds/fond_hall_entree.webp") center / cover no-repeat;
  overflow: hidden;
}

/* Base portail */
.portail {
  position: absolute;
  top: var(--y);
  left: var(--x);
  transform: translate(-50%, -50%);
  width: 200px;
  aspect-ratio: 1 / 1;
  border-radius: 50%;
  overflow: hidden;
  cursor: pointer;
  transition: transform 0.4s ease, box-shadow 0.4s ease;
	
  animation:
    float var(--float-duration, 16s)
    ease-in-out
    infinite
    var(--float-delay, 0s);
}

.portail img {
  width: 100%;
  height: 100%;
  object-fit: cover;
  border-radius: 50%;
}


/* ================================
   ANIMATIONS
================================ */

@keyframes float {
  0%   { transform: translate(-50%, -50%) translate(0, 0); }
  25%  { transform: translate(-50%, -50%) translate(8px, -12px); }
  50%  { transform: translate(-50%, -50%) translate(-6px, 10px); }
  75%  { transform: translate(-50%, -50%) translate(10px, 6px); }
  100% { transform: translate(-50%, -50%) translate(0, 0); }
}

/* Explorateur (spécial) */
.portail-explorateur {
  box-shadow: 0 0 18px rgba(0, 255, 140, 0.25);
  transform: translate(-50%, -50%) scale(0.65);
  opacity: 0; /* caché par défaut */
  pointer-events: none;
  z-index: 1;
}

/* Mobile : recentrage et réduction */
@media (max-width: 768px) {
  .portail {
    width: 120px;
  }
}