/* Overlay loader (css pris du site https://css-loaders.com/)*/
#loader-overlay {
  position: fixed;
  top: 0; left: 0;
  width: 100%; height: 100%;
  background: linear-gradient(
    rgba(10, 20, 60, 0.2),
    rgba(0, 0, 0, 0.4)
  );
  display: flex;
  flex-direction: column;
  align-items: center;
  justify-content: center;
  z-index: 9999;
  font-family: 'Roboto', sans-serif;
  opacity: 0;
  backdrop-filter: blur(0px);
  pointer-events: none;
  transition: opacity 0.5s ease, backdrop-filter 0.5s ease;
}
#loader-overlay.active {
  opacity: 1;
  backdrop-filter: blur(3px);
  pointer-events: all;
}
#loader-overlay.hidden {
  display: none;
}

/* Spinner wrapper (fade/slide) */
.loader-spin-wrap {
  opacity: 0;
  transform: translateY(10px);
  transition: opacity 0.5s ease, transform 0.5s ease;
  transition-delay: 0.5s; /* apparaît après 0.5s */
}
#loader-overlay.active .loader-spin-wrap {
  opacity: 1;
  transform: translateY(0);
}

/* Spinner circulaire */
.loader-spin {
  width: 50px;
  aspect-ratio: 1;
  border-radius: 50%;
  mask:1;
  background: 
    radial-gradient(farthest-side,darkblue 94%,transparent) top/8px 8px no-repeat,
    conic-gradient(transparent 30%,darkblue);
  -webkit-mask: radial-gradient(farthest-side,transparent calc(100% - 8px),#000 0); 
  animation: l13 1s infinite linear;
}
@keyframes l13 { 
  100% { transform: rotate(1turn); }
}

/* Erreur */
#error-message {
  display: none;
  color: red;
  font-weight: bold;
  text-align: center;
  margin-top: 20px;
  white-space: pre-line;
}