body {
  font-family: system-ui, -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, sans-serif;
  max-width: 900px;
  margin: 40px auto;
  padding: 0 16px;
}

nav a {
  margin-right: 12px;
}

.card {
  border: 1px solid #ddd;
  padding: 16px;
  border-radius: 10px;
}

textarea,
input {
  width: 100%;
  padding: 10px;
  margin: 6px 0;
  box-sizing: border-box;
}

button {
  padding: 10px 14px;
  margin-right: 8px;
}

.muted {
  color: #666;
}