/* ===== Flappy Bird 页面样式 ===== */
html,
body {
  margin: 0;
  padding: 0;
  height: 100%;
  display: flex;
  align-items: center;
  justify-content: center;
  background: #1b2632;
  overflow: hidden;
  /* 防止移动端双击缩放 */
  touch-action: manipulation;
}

canvas {
  border-radius: 12px;
  box-shadow: 0 10px 40px rgba(0, 0, 0, 0.5);
  cursor: pointer;
}