body {
  font-family: system-ui, sans-serif;
  max-width: 800px;
  margin: 2rem auto;
  padding: 0 1rem;
  color: #1a1a1a;
}
nav a {
  margin-right: 1rem;
  text-decoration: none;
  color: #0a58ca;
  font-weight: 600;
}
label {
  display: block;
  margin: 0.6rem 0;
  font-size: 0.9rem;
}
input, select {
  width: 100%;
  padding: 0.4rem;
  margin-top: 0.2rem;
  box-sizing: border-box;
}
button {
  margin-top: 1rem;
  padding: 0.5rem 1.2rem;
  cursor: pointer;
}
.hint {
  color: #666;
  font-size: 0.85rem;
  margin: 0.3rem 0 0;
}
pre {
  white-space: pre-wrap;
  word-break: break-word;
  background: #f5f5f5;
  padding: 1rem;
  border-radius: 4px;
  margin-top: 1rem;
}
table {
  border-collapse: collapse;
  width: 100%;
  margin-top: 1rem;
}
th, td {
  border: 1px solid #ddd;
  padding: 0.4rem;
  text-align: left;
  font-size: 0.9rem;
}