body {
  font-family: sans-serif;
  margin: 20px;
  background: #f9f9f9;
  color: #333;
}
.dark {
  background: #1a1a1a;
  color: #ddd;
}
.app {
  max-width: 800px;
  margin: auto;
}
.controls {
  background: #eee;
  padding: 10px;
  border-radius: 8px;
  margin-bottom: 20px;
}
.question {
  margin-bottom: 8px;
}
.options label {
  display: block;
  margin: 4px 0;
}
.correct {
  color: green;
  font-weight: bold;
}
.incorrect {
  color: red;
  font-weight: bold;
}
.answer {
  margin-top: 5px;
  padding-left: 10px;
  border-left: 3px solid #ccc;
}
.file-button {
  display: inline-block;
  padding: 6px 12px;
  background: #eee;
  border: 1px solid #ccc;
  border-radius: 6px;
  cursor: pointer;
  margin-right: 10px;
}
.file-button:hover {
  background: #ddd;
}


/* ✅ 加粗自动题号 */
ol#quiz-questions li::marker {
  font-weight: bold;
  font-size: 1.1em;
}