body {
  font-family: system-ui, -apple-system, BlinkMacSystemFont, "Segoe UI", sans-serif;
  max-width: 780px;
  margin: 2rem auto;
  padding: 0 1rem;
  line-height: 1.5;
  color: #222;
  background: #fafafa;
}

.card {
  background: white;
  border: 1px solid #ddd;
  border-radius: 12px;
  padding: 1.25rem;
  box-shadow: 0 2px 8px rgba(0, 0, 0, 0.05);
}

label {
  display: block;
  font-weight: 600;
  margin-top: 1rem;
}

input, textarea, button {
  width: 100%;
  box-sizing: border-box;
  font: inherit;
  margin-top: 0.35rem;
  padding: 0.65rem;
}

textarea {
  min-height: 170px;
}

button {
  margin-top: 1rem;
  cursor: pointer;
  font-weight: 700;
}

button.secondary {
  width: auto;
  margin: 0;
  padding: 0.25rem 0.5rem;
}

.inline-form {
  display: inline;
  margin-left: 0.5rem;
}

pre {
  background: #f4f4f4;
  padding: 1rem;
  overflow-x: auto;
  white-space: pre-wrap;
  border: 1px solid #ddd;
}

.note {
  background: #fff8d8;
  border: 1px solid #e6d37a;
  padding: 0.75rem;
  margin: 1rem 0;
}

.ok {
  color: #126b2f;
  font-weight: 700;
}

.err {
  color: #9c1b1b;
  font-weight: 700;
}

nav {
  margin-bottom: 1rem;
  font-size: 0.95rem;
}

a {
  color: #0b4f9c;
}