body {
  margin: 0;
  font-family: Arial, sans-serif;
  background: #f2f6f9;
  color: #222;
}

.app {
  max-width: 800px;
  margin: auto;
  padding: 20px;
}

header {
  text-align: center;
  margin-bottom: 20px;
}

h1 {
  color: #2c7be5;
}

.controls {
  display: flex;
  justify-content: center;
  gap: 10px;
  margin-bottom: 20px;
}

select, button {
  padding: 8px 12px;
  font-size: 14px;
}

button {
  background: #2c7be5;
  color: white;
  border: none;
  cursor: pointer;
  border-radius: 4px;
}

button:hover {
  background: #1a5fc4;
}

.passage-box, .questions-box {
  background: white;
  padding: 15px;
  border-radius: 6px;
  margin-bottom: 15px;
}

.question {
  margin-bottom: 15px;
}

.result {
  padding: 15px;
  background: #e8f5e9;
  border-radius: 6px;
  font-weight: bold;
  text-align: center;
}

.hidden {
  display: none;
}

footer {
  text-align: center;
  margin-top: 30px;
  font-size: 13px;
  color: #666;
}