html, body { margin: 0; height: 100%; overflow: hidden; background: #000; }
#canvas { position: fixed; inset: 0; width: 100%; height: 100%; display: block; touch-action: none; cursor: none; outline: none; }
#message { position: fixed; left: 0; right: 0; top: 40%; max-width: 28rem; margin: 0 auto; padding: 0 16px; color: #c9ccd3; font: 14px/1.5 system-ui, sans-serif; text-align: center; white-space: pre-line; }