/* Scoped custom styles leveraging standard Bootstrap 5 variables for automatic theme synchronization */
  .kc-quiz-wrapper {
    font-family: 'Roboto', system-ui, -apple-system, sans-serif;
    border-radius: 1rem;
    transition: background-color 0.3s ease, color 0.3s ease;
  }

  /* Interactive option buttons targeting global Bootstrap active variables */
  .kc-option-btn {
    display: flex;
    align-items: center;
    width: 100%;
    text-align: left;
    padding: 1rem 1.25rem;
    margin-bottom: 0.75rem;
    background-color: var(--bs-tertiary-bg);
    border: 1px solid var(--bs-border-color);
    color: var(--bs-body-color);
    border-radius: 0.75rem;
    transition: all 0.2s ease;
    cursor: pointer;
  }

  .kc-option-btn:hover:not(:disabled) {
    background-color: var(--bs-secondary-bg);
    border-color: var(--bs-primary);
    transform: translateX(3px);
  }

  .kc-option-btn:focus {
    outline: none;
    box-shadow: 0 0 0 3px rgba(var(--bs-primary-rgb), 0.25);
  }

  .kc-option-btn.correct {
    background-color: rgba(var(--bs-success-rgb), 0.15) !important;
    border-color: var(--bs-success) !important;
    color: var(--bs-success-text-emphasis) !important;
    font-weight: 600;
  }

  .kc-option-btn.incorrect {
    background-color: rgba(var(--bs-danger-rgb), 0.15) !important;
    border-color: var(--bs-danger) !important;
    color: var(--bs-danger-text-emphasis) !important;
  }

  .kc-badge {
    font-size: 0.75rem;
    text-transform: uppercase;
    letter-spacing: 0.05em;
    font-weight: 700;
    padding: 0.35em 0.65em;
    border-radius: 0.375rem;
  }

  /* Educational feedback card */
  .kc-feedback-card {
    border-left: 4px solid var(--bs-primary);
    display: none;
    animation: fadeIn 0.4s ease forwards;
  }

  .kc-feedback-card.correct-feedback {
    border-left-color: var(--bs-success);
  }

  .kc-feedback-card.incorrect-feedback {
    border-left-color: var(--bs-danger);
  }

  /* Score radial gauge */
  .kc-score-ring {
    position: relative;
    width: 150px;
    height: 150px;
    margin: 0 auto;
  }

  .kc-score-ring svg {
    width: 100%;
    height: 100%;
    transform: rotate(-90deg);
  }

  .kc-score-ring circle {
    fill: none;
    stroke-width: 12;
  }

  .kc-score-ring .bg-circle {
    stroke: var(--bs-border-color);
  }

  .kc-score-ring .progress-circle {
    stroke: var(--bs-primary);
    stroke-linecap: round;
    transition: stroke-dashoffset 1s ease-out;
  }

  .kc-score-text {
    position: absolute;
    top: 50%;
    left: 50%;
    transform: translate(-50%, -50%);
    font-size: 1.75rem;
    font-weight: 800;
    color: var(--bs-body-color);
  }

  @keyframes fadeIn {
    from { opacity: 0; transform: translateY(10px); }
    to { opacity: 1; transform: translateY(0); }
  }