:root {
    font-family: system-ui, sans-serif;
    line-height: 1.45;
    color: #1a1a1a;
    background: #f4f4f2;
  }
  body {
    max-width: 52rem;
    margin: 0 auto;
    padding: 1.25rem;
  }
  h1 {
    font-size: 1.25rem;
    font-weight: 600;
    margin: 0 0 1rem;
  }
  .row {
    display: flex;
    flex-wrap: wrap;
    gap: 0.5rem 1rem;
    align-items: center;
    margin-bottom: 0.75rem;
  }
  label {
    font-size: 0.875rem;
  }
  select {
    min-width: 12rem;
    padding: 0.35rem 0.5rem;
  }
  textarea {
    width: 100%;
    min-height: 8rem;
    box-sizing: border-box;
    font-family: ui-monospace, monospace;
    font-size: 0.875rem;
    padding: 0.5rem;
    border: 1px solid #ccc;
    border-radius: 4px;
    resize: vertical;
  }
  .field {
    margin-bottom: 1rem;
  }
  .meta {
    font-size: 0.8rem;
    color: #555;
    margin: 0.25rem 0 0.35rem;
  }
  button {
    padding: 0.4rem 0.75rem;
    border: 1px solid #888;
    border-radius: 4px;
    background: #fff;
    cursor: pointer;
    font-size: 0.875rem;
  }
  button:hover {
    background: #eee;
  }
  .status {
    font-size: 0.875rem;
    margin-top: 0.75rem;
    min-height: 1.25rem;
  }
  .status.error {
    color: #a30;
  }
  .transport-warn {
    display: none;
    margin: 0.75rem 0 0;
    padding: 0.6rem 0.75rem;
    font-size: 0.85rem;
    border: 1px solid #c9a227;
    border-radius: 4px;
    background: #fffbeb;
    color: #5c4a00;
  }
  .transport-warn.visible {
    display: block;
  }
  .transport-warn strong {
    font-weight: 600;
  }
  .transport-warn ul {
    margin: 0.35rem 0 0 1.1rem;
    padding: 0;
  }
  .site-footer {
    margin-top: 1.25rem;
    padding-top: 0.75rem;
    border-top: 1px solid #ccc;
  }
  .footer-source-link {
    display: inline-flex;
    align-items: center;
    gap: 0.35rem;
    font-size: 0.8rem;
    color: #555;
    text-decoration: none;
  }
  .footer-source-link:hover {
    color: #1a1a1a;
  }
  .footer-source-link:focus-visible {
    outline: 2px solid #555;
    outline-offset: 2px;
  }
  .footer-source-text {
    text-decoration: underline;
    text-underline-offset: 0.15em;
  }
  .footer-source-icon {
    display: block;
    width: 1rem;
    height: 1rem;
    flex-shrink: 0;
    opacity: 0.9;
  }
  .footer-source-link:hover .footer-source-icon {
    opacity: 1;
  }