* { margin: 0; padding: 0; box-sizing: border-box; }
html, body { width: 100%; height: 100%; overflow: hidden; background: #05060a; }
body { font-family: -apple-system, "Microsoft YaHei", sans-serif; }
#scene-canvas { display: block; width: 100vw; height: 100vh; }
#loader {
  position: fixed; top: 50%; left: 50%; transform: translate(-50%, -50%);
  color: #8ba4c4; font-size: 14px; letter-spacing: 2px; z-index: 100;
  animation: pulse 1.5s ease-in-out infinite;
}
@keyframes pulse { 0%,100% { opacity: .4; } 50% { opacity: 1; } }
@media (prefers-reduced-motion: reduce) {
  #loader { animation: none; opacity: .7; }
}