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

html,
body {
  width: 100%;
  height: 100%;
  background: radial-gradient(circle at top, #1b1230 0%, #050815 45%, #02040a 100%);
  font-family: system-ui, -apple-system, BlinkMacSystemFont, "SF Pro Text", sans-serif;
  overflow: hidden;
}

/* 让画布是唯一的视觉主体 */
canvas {
  display: block;
}