:root {
  --spot-size: 360px;
  --spot-scale: 1;
  --x: 50vw;
  --y: 50vh;
}

/* Círculo brillante que sigue al ratón o al dedo */
.spot {
  --size: var(--spot-size);
  position: fixed;
  left: var(--x);
  top: var(--y);
  width: var(--size);
  height: var(--size);
  transform: translate(-50%, -50%) scale(var(--spot-scale));
  border-radius: 50%;
  pointer-events: none;
  z-index: 0;
  background: radial-gradient(
    circle at 50% 40%,
    rgba(255, 255, 255, 0.85) 0%,
    rgba(255, 255, 255, 0.25) 18%,
    rgba(255, 255, 255, 0.06) 36%,
    rgba(0, 0, 0, 0) 60%
  );
  filter: blur(18px) saturate(120%);
  transition: opacity 300ms ease, transform 120ms ease;
  opacity: 1;
  will-change: transform, left, top;
  mix-blend-mode: screen;
}

.spot::after {
  content: "";
  position: absolute;
  inset: 50% auto auto 50%;
  width: 220px;
  height: 220px;
  transform: translate(-50%, -50%);
  background: radial-gradient(
    circle,
    rgba(255, 255, 255, 0.06) 0%,
    rgba(255, 255, 255, 0) 60%
  );
  filter: blur(36px);
  border-radius: 50%;
}

.no-cursor .spot {
  opacity: 0;
}

/* Ajustes móviles */
@media (max-width: 700px) {
  .spot {
    --spot-size: 200px;  /* más pequeño en móviles */
    display: block;
    opacity: 0;           /* inicial invisible hasta tocar */
  }
}