body {
  font-family: sans-serif;
  max-width: 600px;
  margin: 20px auto;
}

textarea, input {
  width: 100%;
  box-sizing: border-box;
}

#status {
  color: #b00;
  margin-top: 10px;
}

#results ol {
  padding-left: 20px;
}

.spinner {
  display: inline-block;
  width: 16px;
  height: 16px;
  border: 2px solid #ddd;
  border-top-color: #333;
  border-radius: 50%;
  animation: spin 0.6s linear infinite;
  margin-left: 10px;
  vertical-align: middle;
}

.spinner.hidden {
  display: none;
}

@keyframes spin {
  to { transform: rotate(360deg); }
}