body {
    font-family: system-ui, -apple-system, BlinkMacSystemFont, "Segoe UI",
      sans-serif;
    margin: 0;
    padding: 1.5rem;
    background: #f5f5f5;
  }

  .container {
    max-width: 800px;
    margin: 0 auto;
    background: #ffffff;
    border-radius: 8px;
    padding: 1.5rem;
    box-shadow: 0 2px 8px rgba(0, 0, 0, 0.08);
  }

  h1 {
    margin-top: 0;
    font-size: 1.6rem;
    margin-bottom: 1rem;
  }

  label {
    font-weight: 600;
    display: block;
    margin-bottom: 0.4rem;
  }

  textarea,
  input[type="text"] {
    width: 100%;
    box-sizing: border-box;
    font-family: inherit;
    font-size: 1rem;
    padding: 0.5rem;
    border-radius: 4px;
    border: 1px solid #ccc;
    resize: vertical;
  }

  textarea {
    min-height: 140px;
  }

  .row {
    margin-bottom: 1rem;
  }

  button {
    background: #007acc;
    color: #ffffff;
    border: none;
    border-radius: 4px;
    padding: 0.5rem 1rem;
    font-size: 1rem;
    cursor: pointer;
  }

  button:disabled {
    opacity: 0.6;
    cursor: not-allowed;
  }

  .status {
    margin-left: 0.75rem;
    font-size: 0.9rem;
    color: #555;
  }

  .error {
    color: #b00020;
  }

  .response-area {
    white-space: pre-wrap; /* preserve newlines */
  }