html, body {
  margin: 0;
  padding: 0;
  height: 100%; 
  overflow: hidden
}
canvas {
  display: block;
}

.info-card {
  position: fixed;
  top: 20px;
  left: 20px;

  padding: 12px 16px;
  border-radius: 10px;

  background: rgba(0, 0, 0, 0.6); /* dark translucent */
  color: white;

  font-family: system-ui, -apple-system, sans-serif;
  font-size: 1.1rem;
  letter-spacing: 0.3px;

  box-shadow: 0 8px 20px rgba(0, 0, 0, 0.35);
  backdrop-filter: blur(6px); /* subtle glass effect */
  -webkit-backdrop-filter: blur(6px);

  
  z-index: 100;
}

a {
  text-decoration: none;
  color: aqua;
}

.hint-card {
  position: fixed;
  left: 50%;
  bottom: 30px;
  transform: translateX(-50%);

  padding: 14px 18px;
  border-radius: 12px;

  background: rgba(0, 0, 0, 0.6);
  color: white;

  font-family: system-ui, -apple-system, sans-serif;
  font-size: 15px;
  text-align: center;
  line-height: 1.4;

  box-shadow: 0 8px 20px rgba(0, 0, 0, 0.35);
  backdrop-filter: blur(6px);
  -webkit-backdrop-filter: blur(6px);

  pointer-events: none;

  opacity: 1;
  transition: opacity 1.5s ease;
}

/* when hidden */
.hint-card.hide {
  opacity: 0;
}