body {
  font-family: Arial, sans-serif;
  background: #f4f6f8;
  margin: 0;
  padding: 20px;
}

.container {
  max-width: 750px;
  margin: auto;
  background: #ffffff;
  padding: 25px;
  border-radius: 12px;
  box-shadow: 0 0 12px rgba(0, 0, 0, 0.1);
}

h1, h2 {
  text-align: center;
}

.top-bar {
  text-align: center;
  margin-bottom: 25px;
}

label {
  font-weight: bold;
  margin-right: 8px;
}

select,
button {
  padding: 10px 14px;
  font-size: 16px;
  margin: 8px 5px;
  border-radius: 6px;
  border: 1px solid #ccc;
}

button {
  cursor: pointer;
}

button:hover {
  opacity: 0.95;
}

.question-card {
  margin-top: 10px;
}

#options {
  display: flex;
  flex-direction: column;
  gap: 12px;
  margin-top: 20px;
}

.option-btn {
  padding: 12px;
  border: 1px solid #ccc;
  background: #f9f9f9;
  cursor: pointer;
  border-radius: 6px;
  text-align: left;
  font-size: 16px;
}

.option-btn:hover:not(:disabled) {
  background: #e9f3ff;
}

.option-btn:disabled {
  cursor: not-allowed;
}

.correct {
  background: #c8f7c5 !important;
  border-color: #5cb85c;
}

.wrong {
  background: #f7c5c5 !important;
  border-color: #d9534f;
}

.hidden {
  display: none;
}

#nextBtn,
#restartBtn {
  display: block;
  margin: 20px auto 0;
}

#scoreText {
  text-align: center;
  font-size: 20px;
  font-weight: bold;
}