function SparkNodeApp() {
  return (
    <div style={{ position: 'fixed', inset: 0, background: '#e7e5df' }}>
      <iframe
        src="projects/sparknode/sketch.html"
        title="SparkNode 设计稿"
        style={{
          position: 'absolute',
          top: 0, left: 0,
          width: '100%', height: '100%',
          border: 'none',
        }}
      />
    </div>
  );
}