* { box-sizing: border-box; margin: 0; padding: 0; }

html, body {
  width: 100%;
  height: 100%;
  background-color: #FAFAFA;
  font-family: -apple-system, BlinkMacSystemFont, 'Segoe UI', Roboto, sans-serif;
  overflow: hidden;
}

canvas {
  display: block;
  width: 100%;
  height: 100%;
}

#app-loading {
  display: flex;
  flex-direction: column;
  align-items: center;
  justify-content: center;
  height: 100vh;
  color: #555;
  font-size: 16px;
  gap: 16px;
}

.loading-spinner {
  width: 40px;
  height: 40px;
  border: 4px solid #E3F2FD;
  border-top-color: #1565C0;
  border-radius: 50%;
  animation: spin 0.9s linear infinite;
}

@keyframes spin { to { transform: rotate(360deg); } }