/* ===== QUIZ APP: 2-COLUMN INTERACTIVE LAYOUT ===== */

/* Hide original flat content when JS transforms it */
.md-typeset .quiz-original-content {
  display: none !important;
}

/* ---- Mode selector ---- */
.md-typeset .quiz-mode-bar {
  display: flex;
  align-items: center;
  gap: 1rem;
  padding: 0.75rem 1.2rem;
  margin-bottom: 0;
  background: var(--md-code-bg-color, #f5f5f5);
  border: 1px solid rgba(0, 0, 0, 0.08);
  border-bottom: none;
  border-radius: 8px 8px 0 0;
}

.md-typeset .quiz-mode-bar__label {
  font-size: 0.78rem;
  font-weight: 700;
  text-transform: uppercase;
  letter-spacing: 1px;
  color: var(--md-default-fg-color--light, #666);
}

.md-typeset .quiz-mode-btn {
  display: inline-flex;
  align-items: center;
  gap: 0.35rem;
  padding: 0.4rem 1rem;
  border: 2px solid rgba(0, 0, 0, 0.1);
  border-radius: 20px;
  background: var(--md-default-bg-color, #fff);
  color: var(--md-default-fg-color--light, #666);
  font-size: 0.8rem;
  font-weight: 600;
  cursor: pointer;
  transition: all 0.2s ease;
}

.md-typeset .quiz-mode-btn:hover {
  border-color: var(--md-primary-fg-color, #3f51b5);
  color: var(--md-primary-fg-color, #3f51b5);
}

.md-typeset .quiz-mode-btn--active {
  border-color: var(--md-primary-fg-color, #3f51b5);
  background: var(--md-primary-fg-color, #3f51b5);
  color: #fff;
}

.md-typeset .quiz-mode-btn--active:hover {
  background: #303f9f;
  border-color: #303f9f;
  color: #fff;
}

.md-typeset .quiz-mode-btn__icon {
  font-size: 0.9rem;
  line-height: 1;
}

/* ---- Main grid ---- */
.md-typeset .quiz-app {
  display: grid;
  grid-template-columns: 240px 1fr;
  gap: 0;
  min-height: 520px;
  border: 1px solid rgba(0, 0, 0, 0.08);
  border-radius: 0 0 8px 8px;
  overflow: hidden;
  background: var(--md-default-bg-color, #fff);
  box-shadow: 0 2px 12px rgba(0, 0, 0, 0.06);
}

/* ---- Left nav panel ---- */
.md-typeset .quiz-nav {
  background: var(--md-code-bg-color, #f5f5f5);
  border-right: 2px solid rgba(0, 0, 0, 0.1);
  display: flex;
  flex-direction: column;
  overflow: hidden;
}

.md-typeset .quiz-nav__header {
  padding: 1rem 1.2rem 0.75rem;
  font-size: 0.75rem;
  font-weight: 700;
  text-transform: uppercase;
  letter-spacing: 1.5px;
  color: var(--md-default-fg-color--light, #666);
  border-bottom: 1px solid rgba(0, 0, 0, 0.06);
}

.md-typeset .quiz-nav__list {
  list-style: none;
  margin: 0;
  padding: 0.4rem 0;
  overflow-y: auto;
  flex: 1;
}

.md-typeset .quiz-nav__item {
  display: flex;
  align-items: center;
  gap: 0.65rem;
  padding: 0.55rem 1rem 0.55rem 0.85rem;
  cursor: pointer;
  font-size: 0.85rem;
  color: var(--md-default-fg-color--light, #666);
  transition: background 0.15s ease, color 0.15s ease, border-color 0.15s ease;
  border-left: 4px solid transparent;
  position: relative;
}

.md-typeset .quiz-nav__item:hover {
  background: rgba(0, 0, 0, 0.04);
  color: var(--md-default-fg-color, #333);
}

/* Disabled (exam mode: future unanswered questions) */
.md-typeset .quiz-nav__item--locked {
  opacity: 0.45;
  cursor: not-allowed;
  pointer-events: none;
}

/* ---- Active question: strong highlight ---- */
.md-typeset .quiz-nav__item--active {
  background: rgba(33, 150, 243, 0.12);
  color: #1565c0;
  border-left-color: #1976d2;
  font-weight: 700;
}

.md-typeset .quiz-nav__item--active:hover {
  background: rgba(33, 150, 243, 0.16);
}

.md-typeset .quiz-nav__num {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  width: 30px;
  height: 30px;
  border-radius: 50%;
  background: rgba(0, 0, 0, 0.06);
  font-size: 0.8rem;
  font-weight: 600;
  flex-shrink: 0;
  transition: background 0.2s ease, color 0.2s ease, box-shadow 0.2s ease;
}

/* Blue dot/ring for active question */
.md-typeset .quiz-nav__item--active .quiz-nav__num {
  background: #1976d2;
  color: #fff;
  box-shadow: 0 0 0 3px rgba(25, 118, 210, 0.25);
}

/* Green checkmark for correct */
.md-typeset .quiz-nav__item--correct .quiz-nav__num {
  background: #4caf50;
  color: #fff;
}

/* Red X for incorrect */
.md-typeset .quiz-nav__item--incorrect .quiz-nav__num {
  background: #f44336;
  color: #fff;
}

/* Status icon (checkmark / X / dot) */
.md-typeset .quiz-nav__status {
  margin-left: auto;
  font-size: 0.85rem;
  line-height: 1;
  flex-shrink: 0;
}

.md-typeset .quiz-nav__status--correct {
  color: #4caf50;
}

.md-typeset .quiz-nav__status--incorrect {
  color: #f44336;
}

.md-typeset .quiz-nav__status--unanswered {
  color: rgba(0, 0, 0, 0.18);
  font-size: 0.55rem;
}

.md-typeset .quiz-nav__label {
  overflow: hidden;
  text-overflow: ellipsis;
  white-space: nowrap;
  flex: 1;
}

.md-typeset .quiz-nav__progress {
  padding: 0.75rem 1rem;
  font-size: 0.75rem;
  color: var(--md-default-fg-color--light, #999);
  border-top: 1px solid rgba(0, 0, 0, 0.06);
  text-align: center;
}

/* ---- Right content panel ---- */
.md-typeset .quiz-content {
  padding: 1.5rem 2rem;
  overflow-y: auto;
  display: flex;
  flex-direction: column;
}

.md-typeset .quiz-content__header {
  display: flex;
  justify-content: space-between;
  align-items: center;
  margin-bottom: 0.5rem;
}

.md-typeset .quiz-content__qnum {
  font-size: 0.8rem;
  font-weight: 600;
  color: var(--md-primary-fg-color, #3f51b5);
  text-transform: uppercase;
  letter-spacing: 0.5px;
}

.md-typeset .quiz-content__concept {
  font-size: 0.75rem;
  color: var(--md-default-fg-color--light, #999);
  background: rgba(0, 0, 0, 0.04);
  padding: 0.2rem 0.6rem;
  border-radius: 10px;
}

/* ---- Progress bar with percentage ---- */
.md-typeset .quiz-progress-wrap {
  display: flex;
  align-items: center;
  gap: 0.6rem;
  margin-bottom: 1.2rem;
}

.md-typeset .quiz-progress {
  flex: 1;
  height: 6px;
  background: rgba(0, 0, 0, 0.06);
  border-radius: 3px;
  overflow: hidden;
}

.md-typeset .quiz-progress__fill {
  height: 100%;
  background: linear-gradient(90deg, #42a5f5, #1976d2);
  border-radius: 3px;
  transition: width 0.6s cubic-bezier(0.4, 0, 0.2, 1);
  width: 0%;
}

.md-typeset .quiz-progress__fill--complete {
  background: linear-gradient(90deg, #66bb6a, #43a047);
}

.md-typeset .quiz-progress__pct {
  font-size: 0.7rem;
  font-weight: 700;
  color: var(--md-default-fg-color--light, #999);
  min-width: 36px;
  text-align: right;
  font-variant-numeric: tabular-nums;
  transition: color 0.3s ease;
}

.md-typeset .quiz-progress__pct--complete {
  color: #43a047;
}

/* ---- Question transition wrapper ---- */
.md-typeset .quiz-content__body {
  animation: quizSlideIn 0.28s ease-out;
}

@keyframes quizSlideIn {
  from { opacity: 0; transform: translateX(12px); }
  to   { opacity: 1; transform: translateX(0); }
}

/* ---- Typography hierarchy ---- */
.md-typeset .quiz-content__question {
  font-size: 1.12rem;
  line-height: 1.75;
  margin-bottom: 1.6rem;
  color: var(--md-default-fg-color, #333);
  font-weight: 500;
}

/* ---- Answer choices ---- */
.md-typeset .quiz-choice {
  display: flex;
  align-items: flex-start;
  gap: 0.75rem;
  padding: 0.95rem 1.1rem;
  margin-bottom: 0.65rem;
  border: 2px solid rgba(0, 0, 0, 0.08);
  border-radius: 10px;
  cursor: pointer;
  transition: border-color 0.2s ease, background 0.2s ease, transform 0.15s ease, box-shadow 0.2s ease;
  position: relative;
}

.md-typeset .quiz-choice:hover {
  border-color: rgba(63, 81, 181, 0.25);
  background: rgba(63, 81, 181, 0.025);
  transform: translateY(-1px);
  box-shadow: 0 2px 8px rgba(0, 0, 0, 0.06);
}

.md-typeset .quiz-choice:active {
  transform: translateY(0) scale(0.995);
  box-shadow: none;
}

.md-typeset .quiz-choice__radio {
  position: absolute;
  opacity: 0;
  width: 0;
  height: 0;
}

.md-typeset .quiz-choice__letter {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  width: 32px;
  height: 32px;
  border-radius: 50%;
  background: rgba(0, 0, 0, 0.06);
  font-size: 0.85rem;
  font-weight: 700;
  flex-shrink: 0;
  transition: background 0.2s ease, color 0.2s ease;
}

.md-typeset .quiz-choice__text {
  flex: 1;
  line-height: 1.65;
  padding-top: 0.25rem;
  font-size: 0.95rem;
}

/* Selected state */
.md-typeset .quiz-choice--selected {
  border-color: var(--md-primary-fg-color, #3f51b5);
  background: rgba(63, 81, 181, 0.04);
  box-shadow: 0 0 0 1px rgba(63, 81, 181, 0.15);
}

.md-typeset .quiz-choice--selected .quiz-choice__letter {
  background: var(--md-primary-fg-color, #3f51b5);
  color: #fff;
}

/* Correct: soft green fade-in */
.md-typeset .quiz-choice--correct {
  border-color: #4caf50 !important;
  background: rgba(76, 175, 80, 0.06) !important;
  animation: quizCorrectFade 0.5s ease;
}

@keyframes quizCorrectFade {
  0%   { background: rgba(76, 175, 80, 0); border-color: rgba(0, 0, 0, 0.08); }
  100% { background: rgba(76, 175, 80, 0.06); border-color: #4caf50; }
}

.md-typeset .quiz-choice--correct .quiz-choice__letter {
  background: #4caf50 !important;
  color: #fff !important;
}

/* Incorrect */
.md-typeset .quiz-choice--incorrect {
  border-color: #f44336 !important;
  background: rgba(244, 67, 54, 0.06) !important;
}

.md-typeset .quiz-choice--incorrect .quiz-choice__letter {
  background: #f44336 !important;
  color: #fff !important;
}

/* Shake animation for incorrect (exam reveal) */
.md-typeset .quiz-choice--shake {
  animation: quizShake 0.45s ease;
}

@keyframes quizShake {
  0%, 100% { transform: translateX(0); }
  15%      { transform: translateX(-6px); }
  30%      { transform: translateX(5px); }
  45%      { transform: translateX(-4px); }
  60%      { transform: translateX(3px); }
  75%      { transform: translateX(-1px); }
}

.md-typeset .quiz-choice--disabled {
  pointer-events: none;
  opacity: 0.85;
}

.md-typeset .quiz-choice--disabled:hover {
  transform: none;
  box-shadow: none;
}

/* ---- Buttons ---- */
.md-typeset .quiz-btn {
  display: inline-flex;
  align-items: center;
  gap: 0.4rem;
  padding: 0.65rem 1.4rem;
  border: 2px solid;
  border-radius: 6px;
  font-size: 0.9rem;
  font-weight: 600;
  cursor: pointer;
  transition: all 0.2s ease;
  background: transparent;
}

.md-typeset .quiz-btn:disabled {
  opacity: 0.35;
  cursor: not-allowed;
}

.md-typeset .quiz-btn--check {
  border-color: var(--md-primary-fg-color, #3f51b5);
  color: var(--md-primary-fg-color, #3f51b5);
}

.md-typeset .quiz-btn--check:hover:not(:disabled) {
  background: var(--md-primary-fg-color, #3f51b5);
  color: #fff;
}

.md-typeset .quiz-btn--finish {
  border-color: #e65100;
  color: #e65100;
  margin-left: 0.5rem;
}

.md-typeset .quiz-btn--finish:hover:not(:disabled) {
  background: #e65100;
  color: #fff;
}

.md-typeset .quiz-btn--prev,
.md-typeset .quiz-btn--next {
  border-color: rgba(0, 0, 0, 0.15);
  color: var(--md-default-fg-color--light, #666);
}

.md-typeset .quiz-btn--prev:hover:not(:disabled),
.md-typeset .quiz-btn--next:hover:not(:disabled) {
  border-color: var(--md-primary-fg-color, #3f51b5);
  color: var(--md-primary-fg-color, #3f51b5);
}

.md-typeset .quiz-content__actions {
  display: flex;
  align-items: center;
  flex-wrap: wrap;
  gap: 0.5rem;
  margin-bottom: 1rem;
}

.md-typeset .quiz-content__nav-buttons {
  display: flex;
  justify-content: space-between;
  margin-top: auto;
  padding-top: 1.5rem;
  border-top: 1px solid rgba(0, 0, 0, 0.06);
}

/* ---- Feedback area: smooth reveal ---- */
.md-typeset .quiz-content__feedback {
  padding: 1.2rem;
  border-radius: 8px;
  margin-bottom: 1rem;
  line-height: 1.7;
  animation: quizFeedbackReveal 0.4s cubic-bezier(0.4, 0, 0.2, 1);
}

@keyframes quizFeedbackReveal {
  from { opacity: 0; transform: translateY(10px); max-height: 0; }
  to   { opacity: 1; transform: translateY(0); max-height: 600px; }
}

.md-typeset .quiz-content__feedback[hidden] {
  display: none;
}

.md-typeset .quiz-content__feedback--correct {
  background: rgba(76, 175, 80, 0.08);
  border-left: 4px solid #4caf50;
}

.md-typeset .quiz-content__feedback--incorrect {
  background: rgba(244, 67, 54, 0.08);
  border-left: 4px solid #f44336;
}

.md-typeset .quiz-feedback__result {
  font-weight: 700;
  font-size: 1rem;
  margin-bottom: 0.75rem;
  display: flex;
  align-items: center;
  gap: 0.4rem;
}

.md-typeset .quiz-feedback__result--correct {
  color: #2e7d32;
}

.md-typeset .quiz-feedback__result--incorrect {
  color: #c62828;
}

.md-typeset .quiz-feedback__explanation {
  font-size: 0.92rem;
  color: var(--md-default-fg-color, #333);
}

.md-typeset .quiz-feedback__concept {
  font-size: 0.8rem;
  color: var(--md-default-fg-color--light, #666);
  margin-top: 0.75rem;
  font-style: italic;
}

/* ---- Completion badge ---- */
.md-typeset .quiz-badge {
  display: inline-flex;
  align-items: center;
  gap: 0.35rem;
  padding: 0.3rem 0.8rem;
  border-radius: 12px;
  font-size: 0.72rem;
  font-weight: 700;
  text-transform: uppercase;
  letter-spacing: 0.5px;
  animation: quizBadgePop 0.4s cubic-bezier(0.34, 1.56, 0.64, 1);
}

@keyframes quizBadgePop {
  0%   { transform: scale(0); opacity: 0; }
  100% { transform: scale(1); opacity: 1; }
}

.md-typeset .quiz-badge--complete {
  background: rgba(76, 175, 80, 0.12);
  color: #2e7d32;
  border: 1px solid rgba(76, 175, 80, 0.3);
}

/* ---- Score summary screen ---- */
.md-typeset .quiz-summary {
  text-align: center;
  padding: 2rem 1.5rem;
  animation: quizSlideIn 0.4s ease;
}

.md-typeset .quiz-summary__score-ring {
  width: 140px;
  height: 140px;
  margin: 0 auto 1.5rem;
  position: relative;
}

.md-typeset .quiz-summary__score-ring svg {
  transform: rotate(-90deg);
  width: 140px;
  height: 140px;
}

.md-typeset .quiz-summary__score-ring circle {
  fill: none;
  stroke-width: 8;
  cx: 70;
  cy: 70;
  r: 60;
}

.md-typeset .quiz-summary__ring-bg {
  stroke: rgba(0, 0, 0, 0.06);
}

.md-typeset .quiz-summary__ring-fill {
  stroke-linecap: round;
  transition: stroke-dashoffset 1s cubic-bezier(0.4, 0, 0.2, 1);
}

.md-typeset .quiz-summary__ring-fill--good { stroke: #4caf50; }
.md-typeset .quiz-summary__ring-fill--ok   { stroke: #ff9800; }
.md-typeset .quiz-summary__ring-fill--poor { stroke: #f44336; }

.md-typeset .quiz-summary__score-text {
  position: absolute;
  top: 50%;
  left: 50%;
  transform: translate(-50%, -50%);
  font-size: 1.8rem;
  font-weight: 700;
  color: var(--md-default-fg-color, #333);
}

.md-typeset .quiz-summary__score-label {
  font-size: 0.7rem;
  text-transform: uppercase;
  letter-spacing: 1px;
  color: var(--md-default-fg-color--light, #999);
  display: block;
  margin-top: 0.2rem;
  font-weight: 400;
}

.md-typeset .quiz-summary__title {
  font-size: 1.4rem;
  font-weight: 700;
  margin-bottom: 0.4rem;
  color: var(--md-default-fg-color, #333);
}

.md-typeset .quiz-summary__subtitle {
  font-size: 0.9rem;
  color: var(--md-default-fg-color--light, #999);
  margin-bottom: 1.5rem;
}

.md-typeset .quiz-summary__breakdown {
  display: flex;
  justify-content: center;
  gap: 2rem;
  margin-bottom: 2rem;
}

.md-typeset .quiz-summary__stat { text-align: center; }

.md-typeset .quiz-summary__stat-num {
  font-size: 1.6rem;
  font-weight: 700;
  line-height: 1.2;
}

.md-typeset .quiz-summary__stat-num--correct  { color: #4caf50; }
.md-typeset .quiz-summary__stat-num--incorrect { color: #f44336; }
.md-typeset .quiz-summary__stat-num--skipped   { color: #9e9e9e; }

.md-typeset .quiz-summary__stat-label {
  font-size: 0.7rem;
  text-transform: uppercase;
  letter-spacing: 0.5px;
  color: var(--md-default-fg-color--light, #999);
}

/* Question review list in summary */
.md-typeset .quiz-summary__review {
  text-align: left;
  margin-top: 1.5rem;
  border-top: 1px solid rgba(0, 0, 0, 0.06);
  padding-top: 1rem;
}

.md-typeset .quiz-summary__review-title {
  font-size: 0.85rem;
  font-weight: 700;
  text-transform: uppercase;
  letter-spacing: 1px;
  color: var(--md-default-fg-color--light, #666);
  margin-bottom: 0.75rem;
}

.md-typeset .quiz-summary__review-item {
  display: flex;
  align-items: center;
  gap: 0.6rem;
  padding: 0.5rem 0.75rem;
  margin-bottom: 0.35rem;
  border-radius: 6px;
  cursor: pointer;
  font-size: 0.85rem;
  transition: background 0.15s ease;
}

.md-typeset .quiz-summary__review-item:hover {
  background: rgba(0, 0, 0, 0.04);
}

.md-typeset .quiz-summary__review-icon { font-size: 0.9rem; flex-shrink: 0; }
.md-typeset .quiz-summary__review-q { font-weight: 600; flex-shrink: 0; min-width: 28px; }

.md-typeset .quiz-summary__review-text {
  flex: 1;
  overflow: hidden;
  text-overflow: ellipsis;
  white-space: nowrap;
  color: var(--md-default-fg-color--light, #666);
}

.md-typeset .quiz-summary__actions {
  display: flex;
  justify-content: center;
  gap: 0.75rem;
  margin-top: 1.5rem;
  flex-wrap: wrap;
}

.md-typeset .quiz-btn--restart {
  border-color: var(--md-primary-fg-color, #3f51b5);
  color: var(--md-primary-fg-color, #3f51b5);
}

.md-typeset .quiz-btn--restart:hover {
  background: var(--md-primary-fg-color, #3f51b5);
  color: #fff;
}

.md-typeset .quiz-btn--review {
  border-color: #e65100;
  color: #e65100;
}

.md-typeset .quiz-btn--review:hover {
  background: #e65100;
  color: #fff;
}

/* ---- Mobile: stack vertically ---- */
@media (max-width: 768px) {
  .md-typeset .quiz-mode-bar {
    border-radius: 8px 8px 0 0;
    flex-wrap: wrap;
    gap: 0.5rem;
    padding: 0.6rem 0.8rem;
  }

  .md-typeset .quiz-app {
    grid-template-columns: 1fr;
    min-height: auto;
  }

  .md-typeset .quiz-nav {
    border-right: none;
    border-bottom: 2px solid rgba(0, 0, 0, 0.1);
  }

  .md-typeset .quiz-nav__list {
    display: flex;
    flex-wrap: wrap;
    gap: 0.3rem;
    padding: 0.5rem 0.8rem;
    overflow-y: visible;
  }

  .md-typeset .quiz-nav__item {
    padding: 0.4rem 0.6rem;
    border-left: none;
    border-radius: 6px;
    gap: 0.3rem;
  }

  .md-typeset .quiz-nav__item--active {
    border-left-color: transparent;
    background: #1976d2;
    color: #fff;
  }

  .md-typeset .quiz-nav__item--active .quiz-nav__num {
    background: rgba(255, 255, 255, 0.2);
    color: #fff;
    box-shadow: none;
  }

  .md-typeset .quiz-nav__label { display: none; }
  .md-typeset .quiz-nav__status { display: none; }

  .md-typeset .quiz-content { padding: 1rem 1.2rem; }

  .md-typeset .quiz-content__header {
    flex-direction: column;
    align-items: flex-start;
    gap: 0.25rem;
  }

  .md-typeset .quiz-content__question { font-size: 1.02rem; }
  .md-typeset .quiz-summary__breakdown { gap: 1.2rem; }
}

/* ---- Reduced motion ---- */
@media (prefers-reduced-motion: reduce) {
  .md-typeset .quiz-content__body,
  .md-typeset .quiz-content__feedback,
  .md-typeset .quiz-choice--correct,
  .md-typeset .quiz-choice--shake,
  .md-typeset .quiz-badge,
  .md-typeset .quiz-summary {
    animation: none !important;
  }

  .md-typeset .quiz-progress__fill {
    transition-duration: 0.1s;
  }
}

/* ---- Dark mode support (slate scheme) ---- */
[data-md-color-scheme="slate"] .md-typeset .quiz-mode-bar { border-color: rgba(255, 255, 255, 0.08); }
[data-md-color-scheme="slate"] .md-typeset .quiz-app { border-color: rgba(255, 255, 255, 0.08); }
[data-md-color-scheme="slate"] .md-typeset .quiz-nav { border-right-color: rgba(255, 255, 255, 0.1); }
[data-md-color-scheme="slate"] .md-typeset .quiz-choice { border-color: rgba(255, 255, 255, 0.12); }
[data-md-color-scheme="slate"] .md-typeset .quiz-choice:hover { border-color: rgba(63, 81, 181, 0.4); background: rgba(63, 81, 181, 0.08); }
[data-md-color-scheme="slate"] .md-typeset .quiz-nav__num { background: rgba(255, 255, 255, 0.1); }
[data-md-color-scheme="slate"] .md-typeset .quiz-nav__item:hover { background: rgba(255, 255, 255, 0.06); }
[data-md-color-scheme="slate"] .md-typeset .quiz-progress { background: rgba(255, 255, 255, 0.08); }
[data-md-color-scheme="slate"] .md-typeset .quiz-summary__ring-bg { stroke: rgba(255, 255, 255, 0.1); }
[data-md-color-scheme="slate"] .md-typeset .quiz-nav__status--unanswered { color: rgba(255, 255, 255, 0.2); }