:root {
  --radius: 22px;
  --shadow: 0 20px 45px rgba(0,0,0,.5);
}

/* Page centrée, fond noir */
html, body { 
  height: 100%; 
  margin: 0; 
  font-family: system-ui, sans-serif;
  background: #000;
  display: grid;
  place-items: center;
}

/* Scène avec perspective 3D */
.stage {
  perspective: 1000px;
  width: min(90vw, 600px);
}

/* Carte contenant l'image */
.card {
  position: relative;
  width: 100%;
  border-radius: var(--radius);
  overflow: hidden;
  transform-style: preserve-3d;
  transition: transform .2s ease, box-shadow .2s ease, filter .2s ease;
  background: #111;
  cursor: none; /* curseur invisible */
  will-change: transform;
}

/* Image principale */
.card img {
  width: 100%;
  height: auto;
  display: block;
  object-fit: contain;
  transform: translateZ(40px);
  transition: transform .2s ease;
  user-select: none;
  -webkit-user-drag: none;
  pointer-events: none;
}

/* Aura violette subtile */
.card::after {
  content: "";
  position: absolute;
  inset: -10%;
  background: radial-gradient(
    150px 150px at var(--gx, 50%) var(--gy, 50%),
    rgba(128,0,255,.15) 0%, 
    rgba(128,0,255,.08) 35%,
    rgba(0,0,0,0) 70%
  );
  transform: translateZ(60px);
  pointer-events: none;
  transition: opacity .2s ease;
  opacity: 0;
}

.card.is-hovered {
  box-shadow: var(--shadow);
  filter: saturate(1.05);
}
.card.is-hovered::after { opacity: 1; }