body { cursor: none; }
  .seg { position:fixed; pointer-events:none; z-index:9998; transform:translate(-50%,-50%); }
  .spark { position:fixed; pointer-events:none; border-radius:50%; z-index:9997; animation:sparkFade 0.55s ease-out forwards; }
  @keyframes sparkFade {
    0%   { transform:translate(0,0) scale(1); opacity:1; }
    100% { transform:translate(var(--tx),var(--ty)) scale(0); opacity:0; }
  }