.selected-option {
  background: #e0e7ff !important;
  border-color: #4f8cff !important;
  color: #2563eb !important;
}
.text-secondary.fw-normal.me-2 {
  font-size: 1.1rem;
  opacity: 0.7;
}

#options .correct-answer {
  background: #d1fae5 !important;
  color: #065f46 !important;
  border-color: #16a34a !important;
  font-weight: 600;
}
#options .wrong-answer {
  background: #fee2e2 !important;
  color: #991b1b !important;
  border-color: #dc2626 !important;
  font-weight: 600;
}
#feedback span {
  font-size: 1.1rem;
}
body {
  font-family: 'Segoe UI', Arial, sans-serif;
  background: linear-gradient(135deg, #e0e7ff 0%, #f8fafc 100%);
  min-height: 100vh;
  margin: 0;
  padding: 0;
}

.card {
  border-radius: 18px;
  box-shadow: 0 8px 32px 0 rgba(31, 38, 135, 0.12);
  border: none;
  background: #fff;
}
.card-header {
  border-top-left-radius: 18px;
  border-top-right-radius: 18px;
  font-weight: 600;
  font-size: 1.1rem;
  letter-spacing: 0.5px;
}
.card-body {
  padding: 2rem 1.5rem;
}
.quiz-box {
  background: #fff;
  border-radius: 18px;
  box-shadow: 0 8px 32px 0 rgba(31, 38, 135, 0.12);
  margin-bottom: 2rem;
}
#options button, .option-btn {
  display: block;
  width: 100%;
  margin-bottom: 1rem;
  background: #f1f5f9;
  color: #222;
  border: 2px solid #e0e7ef;
  border-radius: 10px;
  font-size: 1.1rem;
  padding: 0.75rem 1rem;
  text-align: left;
  transition: background 0.2s, border 0.2s, color 0.2s;
  cursor: pointer;
}
#options button:hover, .option-btn:hover {
  background: #dbeafe;
  border-color: #4f8cff;
  color: #2563eb;
}
.btn-success, .btn-primary {
  font-size: 1.15rem;
  border-radius: 10px;
  font-weight: 600;
  letter-spacing: 0.5px;
  box-shadow: 0 2px 8px rgba(31, 38, 135, 0.06);
  transition: background 0.2s, color 0.2s, transform 0.2s;
}
.btn-success:active, .btn-primary:active {
  transform: scale(0.98);
}