html, body {
  margin: 0;
  height: 100%;
  overflow: hidden;
  background: #9dc3e4;
  font-family: system-ui, -apple-system, "Segoe UI", Helvetica, Arial, sans-serif;
}

#scene {
  position: fixed;
  inset: 0;
  width: 100vw;
  height: 100vh;
  display: block;
  cursor: grab;
  touch-action: none;
  user-select: none;
}

#scene.dragging { cursor: grabbing; }

#controls {
  position: fixed;
  right: 14px;
  bottom: 14px;
  display: flex;
  gap: 6px;
  z-index: 2;
}

#controls button {
  min-width: 34px;
  height: 32px;
  padding: 0 9px;
  border: 1px solid rgba(40, 55, 70, .35);
  border-radius: 6px;
  background: rgba(255, 255, 255, .8);
  color: #23303d;
  font: 600 15px/1 inherit;
  cursor: pointer;
  backdrop-filter: blur(3px);
}

#controls button:hover { background: #fff; }
#controls button:active { transform: translateY(1px); }
#controls button:focus-visible { outline: 2px solid #2f5f8f; outline-offset: 1px; }

#credit {
  position: fixed;
  left: 12px;
  bottom: 6px;
  margin: 0;
  font-size: 11px;
  letter-spacing: .015em;
  color: #1e2b36;
  background: rgba(255, 255, 255, .55);
  padding: 2px 6px;
  border-radius: 4px;
  pointer-events: none;
  z-index: 2;
}