html, body {
  margin: 0;
  padding: 0;
  overflow: hidden;
  width: 100%;
  height: 100%;
  background: #000;
}
canvas {
  display: block;
  max-width: 100%;
  max-height: 100%;
}
#loading-overlay {
  position: fixed;
  top: 0;
  left: 0;
  width: 100vw;
  height: 100vh;
  background: #000;
  display: flex;
  flex-direction: column;
  justify-content: center;
  align-items: center;
  z-index: 9999;
  font-family: sans-serif;
  transition: opacity 0.5s ease;
}
.spinner {
  width: 50px;
  height: 50px;
  border: 5px solid rgba(255, 255, 255, 0.1);
  border-top: 5px solid #ddc59f;
  border-radius: 50%;
  animation: spin 1s linear infinite;
  margin-bottom: 20px;
}
#loading-overlay p {
  color: #ddc59f;
  font-size: 16px;
  font-weight: bold;
  letter-spacing: 1.5px;
  margin: 0;
  text-transform: uppercase;
}
@keyframes spin {
  0% { transform: rotate(0deg); }
  100% { transform: rotate(360deg); }
}