body {
  font-family: 'Segoe UI', sans-serif;
  background: #f5f6fa;
  margin: 0;
  padding: 0;
  text-align: center;
}
.container {
  margin: 40px auto;
  padding: 20px;
  background: #fff;
  border-radius: 12px;
  box-shadow: 0 4px 12px rgba(0,0,0,0.1);
  max-width: 500px;
}
h1 {
  color: #2d3436;
}
button {
  padding: 10px 20px;
  margin: 10px;
  font-size: 16px;
  border: none;
  border-radius: 8px;
  background-color: #0984e3;
  color: white;
  cursor: pointer;
}
button:hover {
  background-color: #74b9ff;
}
input, select, textarea {
  width: 90%;
  padding: 10px;
  margin-top: 10px;
  border: 1px solid #ccc;
  border-radius: 6px;
}
.correct { color: green; }
.incorrect { color: red; }
#timer { font-weight: bold; margin-top: 10px; }
#theme { font-weight: bold; margin-bottom: 10px; }