body {
  margin: 0;
  overflow-x: hidden;
}
#three-canvas {
  position: fixed;
  top: 0;
  left: 0;
  z-index: -1;
}
.content-section {
  max-width: 800px;
  margin: 0 auto;
  padding: 20px;
}
.tool-section {
  background: rgba(255, 255, 255, 0.9);
  border-radius: 10px;
  padding: 20px;
}