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

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

/* Base portail */
.portail {
  position: absolute;
  top: var(--y);
  left: var(--x);
  transform: translate(-50%, -50%);
  width: 140px;
  aspect-ratio: 1 / 1;
  border-radius: 50%;
  overflow: hidden;
  cursor: pointer;
  transition: transform 0.4s ease, box-shadow 0.4s ease;
  box-shadow:
    0 0 20px rgba(255,255,255,0.15),
    inset 0 0 15px rgba(255,255,255,0.2);
	
  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%;
}

/* Effet hover */
.portail:hover {
  transform: translate(-50%, -50%) scale(1.08);
  box-shadow:
    0 0 35px rgba(255,255,255,0.35),
    inset 0 0 20px rgba(255,255,255,0.4);
}

/* Portail silencieux */
.portail-silencieux {
  cursor: default;
  filter: grayscale(1) brightness(0.8);
  box-shadow:
    0 0 15px rgba(180,180,180,0.15),
    inset 0 0 10px rgba(180,180,180,0.2);
}

.portail-silencieux:hover {
  transform: translate(-50%, -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); }
}

/* Mobile : recentrage et réduction */
@media (max-width: 768px) {
  .portail {
    width: 90px;
  }
}