.chart-wrap {
  margin: 20px 0;
}

.chart-wrap > div {
  width: 100%;
}

.reveal-btn {
  display: inline-block;
  margin: 1em 0;
  padding: 0.5em 1.2em;
  font-size: 1rem;
  cursor: pointer;
  border: 2px solid #1976d2;
  border-radius: 4px;
  background: #1976d2;
  color: #fff;
}

.reveal-btn:hover {
  background: #1565c0;
  border-color: #1565c0;
}

.answer-wrap {
  position: relative;
}

.reveal-overlay {
  position: absolute;
  top: 40%;
  left: 50%;
  transform: translate(-50%, -50%);
  z-index: 1;
}

.reveal-overlay.hidden {
  display: none;
}

.answer-blurred {
  filter: blur(8px);
  user-select: none;
  pointer-events: none;
  transition: filter 0.3s ease;
}

.answer-revealed {
  filter: none;
  user-select: auto;
  pointer-events: auto;
}