.container {
  max-width: 920px;
  margin: 0 auto;
  padding: 1rem;
  font-family: Arial, sans-serif;
}

.muted {
  color: #555;
}

.panel {
  border: 1px solid #ddd;
  border-radius: 8px;
  padding: 1rem;
  margin-bottom: 1rem;
  background: #fff;
}

.grid {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 0.75rem;
}

.span-2 {
  grid-column: span 2;
}

label,
fieldset {
  display: block;
  margin-bottom: 0.5rem;
}

input,
select,
textarea {
  width: 100%;
  margin-top: 0.25rem;
  padding: 0.4rem;
  box-sizing: border-box;
}

input[type="checkbox"] {
  width: auto;
  margin-top: 0;
}

fieldset label {
  display: inline-block;
  margin-right: 1rem;
}

.actions {
  margin-top: 0.75rem;
}

button {
  margin-right: 0.5rem;
  padding: 0.45rem 0.75rem;
}

.preview {
  border: 1px dashed #aaa;
  border-radius: 8px;
  padding: 0.75rem;
  background: #fafafa;
}

.status {
  margin-top: 0.75rem;
  font-weight: 700;
}

pre {
  background: #f6f8fa;
  border-radius: 8px;
  padding: 0.75rem;
  overflow: auto;
}