/* Full-screen overlay */
#preloader {
  position: fixed;
  inset: 0;
  background: rgba(255, 255, 255, 0.98);
  display: flex;
  justify-content: center;
  align-items: center;
  z-index: 9999;
  opacity: 1;
  visibility: visible;
  transition: opacity 0.3s ease-in-out, visibility 0.3s ease-in-out;
}

/* Double ring spinner */
#preloader::after,
#preloader::before {
  content: '';
  box-sizing: border-box;
  position: absolute;
  width: 60px;
  height: 60px;
  border-radius: 50%;
  border: 3px solid transparent;
}

#preloader::after {
  border-top-color: #3498db;
  border-right-color: #3498db;
  animation: spinnerOne 0.8s linear infinite;
}

#preloader::before {
  border-bottom-color: #2ecc71;
  border-left-color: #2ecc71;
  animation: spinnerTwo 1.2s linear infinite;
}

/* Hide once loaded */
#preloader.hidden {
  opacity: 0;
  visibility: hidden;
}

/* Prevent scrolling during load */
body.loading {
  overflow: hidden;
  height: 100vh;
  margin: 0;
}

/* Spinner animations */
@keyframes spinnerOne {
  0% { transform: rotate(0deg); }
  100% { transform: rotate(360deg); }
}

@keyframes spinnerTwo {
  0% { transform: rotate(0deg); }
  100% { transform: rotate(-360deg); }
}