body {
  font-family: Arial, sans-serif;
  max-width: 860px;
  margin: 40px auto;
  padding: 0 16px;
}

h2,
h3 {
  margin-bottom: 16px;
}

.card {
  border: 1px solid #ddd;
  border-radius: 8px;
  padding: 16px;
  margin-bottom: 16px;
}

.field {
  margin-bottom: 12px;
}

label {
  display: block;
  font-weight: bold;
  margin-bottom: 6px;
}

input {
  box-sizing: border-box;
  width: 100%;
  padding: 10px;
}

button {
  padding: 10px 14px;
  cursor: pointer;
}

pre {
  background: #f6f6f6;
  padding: 12px;
  white-space: pre-wrap;
  overflow: auto;
}

.muted {
  color: #666;
  font-size: 14px;
}