/* ============================================================
   Quiz Gate — Styles for the module quiz UI
   Uses existing CSS custom properties from styles.css
   ============================================================ */

/* --- Quiz container ----------------------------------------- */
.quiz-gate {
  margin-top: var(--space-md);
  padding-top: var(--space-md);
  border-top: 1px solid var(--color-border);
  display: flex;
  flex-direction: column;
  gap: var(--space-sm);
}

/* --- Question fieldset -------------------------------------- */
.quiz-gate__question {
  border: 1px solid var(--color-border);
  border-radius: var(--radius-md);
  padding: var(--space-sm) var(--space-md);
  margin: 0;
  background-color: var(--color-white);
  transition: border-color 0.2s ease, background-color 0.2s ease;
}

/* --- Question text (legend) --------------------------------- */
.quiz-gate__question-text {
  font-weight: 600;
  font-size: 1rem;
  color: var(--color-secondary);
  padding: 0 var(--space-xs);
  line-height: 1.5;
}

/* --- Option labels ------------------------------------------ */
.quiz-gate__option {
  display: flex;
  align-items: center;
  gap: var(--space-xs);
  padding: var(--space-xs) var(--space-sm);
  margin-top: 6px;
  border-radius: var(--radius-sm);
  cursor: pointer;
  font-size: 0.95rem;
  color: var(--color-text);
  transition: background-color 0.15s ease;
}

.quiz-gate__option:hover {
  background-color: var(--color-light);
}

/* Radio button styling */
.quiz-gate__option input[type="radio"] {
  appearance: none;
  -webkit-appearance: none;
  width: 18px;
  height: 18px;
  border: 2px solid var(--color-border);
  border-radius: 50%;
  flex-shrink: 0;
  cursor: pointer;
  position: relative;
  transition: border-color 0.15s ease, background-color 0.15s ease;
}

.quiz-gate__option input[type="radio"]:checked {
  border-color: var(--color-primary);
  background-color: var(--color-primary);
}

.quiz-gate__option input[type="radio"]:checked::after {
  content: '';
  position: absolute;
  top: 50%;
  left: 50%;
  transform: translate(-50%, -50%);
  width: 6px;
  height: 6px;
  border-radius: 50%;
  background-color: var(--color-white);
}

/* Focus states for keyboard navigation (WCAG 2.1 AA) */
.quiz-gate__option input[type="radio"]:focus-visible {
  outline: 3px solid var(--color-accent);
  outline-offset: 2px;
}

.quiz-gate__option input[type="radio"]:disabled {
  opacity: 0.6;
  cursor: not-allowed;
}

.quiz-gate__option:has(input[type="radio"]:disabled) {
  cursor: not-allowed;
  opacity: 0.8;
}

/* --- Submit button ------------------------------------------ */
.quiz-gate__submit {
  align-self: flex-start;
  margin-top: var(--space-xs);
}

.quiz-gate__submit:focus-visible {
  outline: 3px solid var(--color-accent);
  outline-offset: 2px;
}

/* --- Result banner ------------------------------------------ */
.quiz-gate__result {
  padding: var(--space-sm) var(--space-md);
  border-radius: var(--radius-md);
  font-size: 1.1rem;
  font-weight: 700;
  text-align: center;
}

.quiz-gate__result:focus {
  outline: 3px solid var(--color-accent);
  outline-offset: 2px;
}

.quiz-gate__result--pass {
  background-color: #d4edda;
  color: #155724;
  border: 1px solid #c3e6cb;
}

.quiz-gate__result--fail {
  background-color: #f8d7da;
  color: #721c24;
  border: 1px solid #f5c6cb;
}

/* --- Score text inside result banner ------------------------ */
.quiz-gate__score {
  font-size: 0.9rem;
  font-weight: 500;
  margin-top: var(--space-xs);
  margin-bottom: 0;
  opacity: 0.85;
}

/* --- Correct/incorrect question indicators ------------------ */
.quiz-gate__question--correct {
  border-left: 4px solid var(--color-success);
  background-color: #f0faf5;
  border-color: var(--color-success);
}

.quiz-gate__question--incorrect {
  border-left: 4px solid var(--color-primary);
  background-color: #fdf2f2;
  border-color: var(--color-primary);
}

/* --- Retry button ------------------------------------------- */
.quiz-gate__retry {
  align-self: flex-start;
  margin-top: var(--space-xs);
}

.quiz-gate__retry:focus-visible {
  outline: 3px solid var(--color-accent);
  outline-offset: 2px;
}

/* --- Responsive: mobile layout ------------------------------ */
@media (max-width: 768px) {
  .quiz-gate {
    margin-top: var(--space-sm);
    padding-top: var(--space-sm);
  }

  .quiz-gate__question {
    padding: var(--space-xs) var(--space-sm);
  }

  .quiz-gate__option {
    padding: var(--space-xs);
  }

  .quiz-gate__submit,
  .quiz-gate__retry {
    align-self: stretch;
    width: 100%;
  }

  .quiz-gate__result {
    font-size: 1rem;
    padding: var(--space-sm);
  }
}

@media (max-width: 480px) {
  .quiz-gate__question-text {
    font-size: 0.9rem;
  }

  .quiz-gate__option {
    font-size: 0.9rem;
  }
}