.zscore-container {
  max-width: 600px;
  margin: 0 auto;
  padding: 1em;
  border: 1px solid #ddd;
  background: #f9f9f9;
  border-radius: 8px;
}

.zscore-container h3 {
  text-align: center;
  margin-bottom: 1em;
}

.zscore-container textarea,
.zscore-container input {
  width: 100%;
  margin-bottom: 1em;
  padding: 0.5em;
  font-size: 1em;
}

.zscore-container button {
  display: block;
  width: 100%;
  padding: 0.75em;
  background: #0073aa;
  color: white;
  border: none;
  border-radius: 5px;
  cursor: pointer;
}

#zscore-output {
  margin-top: 1em;
  font-weight: bold;
  text-align: center;
}