/* ═══════════════════════════════════════════════════════════
   LIKE ONE ACADEMY — Learning Components Design System
   Research-backed interactive components for frictionless learning.

   Components: QuizMC, MatchConnect, FlashDeck, SortStack,
               PixelQuest, Whiteboard, Citation

   Design principles:
   - Zero unnecessary keystrokes
   - Immediate visual feedback (<200ms)
   - Mobile-first touch targets (min 44px)
   - Satisfying micro-animations
   - Dark theme native
   ═══════════════════════════════════════════════════════════ */

/* ── XP Toast ── */
.lo-xp-toast {
  position: fixed;
  top: 1.5rem;
  right: 1.5rem;
  display: flex;
  align-items: center;
  gap: 0.5rem;
  padding: 0.75rem 1.25rem;
  background: linear-gradient(135deg, #6366f1, #8b5cf6);
  color: #fff;
  border-radius: 2rem;
  font-weight: 700;
  font-size: 1.1rem;
  box-shadow: 0 4px 20px rgba(99, 102, 241, 0.4);
  z-index: 9999;
  animation: xp-pop 2.5s var(--lo-ease) forwards;
  pointer-events: none;
}
.lo-xp-toast-icon { font-size: 1.3rem; }
@keyframes xp-pop {
  0% { opacity: 0; transform: translateY(10px) scale(0.8); }
  15% { opacity: 1; transform: translateY(0) scale(1.05); }
  25% { transform: translateY(0) scale(1); }
  75% { opacity: 1; transform: translateY(0); }
  100% { opacity: 0; transform: translateY(-20px); }
}

/* ── Shared Variables ── */
:root {
  --lo-ease: cubic-bezier(0.22, 1, 0.36, 1);
  --lo-ease-bounce: cubic-bezier(0.34, 1.56, 0.64, 1);
  --lo-ease-snap: cubic-bezier(0.2, 0, 0, 1);
  --lo-radius: 14px;
  --lo-radius-sm: 10px;
  --lo-shadow-glow: 0 0 20px rgba(251, 146, 60, 0.15);
  --lo-shadow-lift: 0 8px 32px rgba(0, 0, 0, 0.3);
  --lo-transition: 0.25s var(--lo-ease);
}

/* ═══════════════════════════════════════════════════════════
   1. QUIZ MC — Multiple Choice
   ═══════════════════════════════════════════════════════════ */

.lo-quiz {
  max-width: 700px;
  margin: 2rem auto;
  padding: 0 1rem;
}

/* Progress bar */
.lo-quiz-progress {
  height: 4px;
  background: var(--border, #1e1e28);
  border-radius: 2px;
  overflow: hidden;
  margin-bottom: 1rem;
}
.lo-quiz-progress-fill {
  height: 100%;
  background: linear-gradient(90deg, var(--orange, #fb923c), var(--purple, #c084fc));
  border-radius: 2px;
  transition: width 0.5s var(--lo-ease);
}

/* Meta row */
.lo-quiz-meta {
  display: flex;
  align-items: center;
  justify-content: space-between;
  margin-bottom: 1.5rem;
}
.lo-quiz-counter {
  font-size: 0.8rem;
  font-weight: 600;
  color: var(--dim, #8888a0);
  letter-spacing: 0.5px;
}

/* Progress dots */
.lo-quiz-dots {
  display: flex;
  gap: 6px;
}
.lo-quiz-dot {
  width: 8px;
  height: 8px;
  border-radius: 50%;
  background: var(--border2, #2a2a38);
  transition: all 0.3s var(--lo-ease);
}
.lo-quiz-dot.dot-active {
  background: var(--orange, #fb923c);
  box-shadow: 0 0 8px rgba(251, 146, 60, 0.4);
  transform: scale(1.2);
}
.lo-quiz-dot.dot-correct {
  background: var(--green, #4ade80);
}
.lo-quiz-dot.dot-wrong {
  background: var(--red, #f87171);
}

/* Question */
.lo-quiz-question {
  text-align: center;
  margin-bottom: 2rem;
}
.lo-quiz-q {
  font-size: clamp(1.2rem, 3vw, 1.5rem);
  font-weight: 700;
  letter-spacing: -0.3px;
  color: var(--text, #e8e8ec);
  line-height: 1.4;
}

/* Options */
.lo-quiz-options {
  display: flex;
  flex-direction: column;
  gap: 0.75rem;
}
.lo-quiz-option {
  display: flex;
  align-items: center;
  gap: 1rem;
  padding: 1rem 1.25rem;
  background: var(--surface, #111114);
  border: 1.5px solid var(--border, #1e1e28);
  border-radius: var(--lo-radius);
  cursor: pointer;
  transition: all 0.2s var(--lo-ease);
  text-align: left;
  font-size: 0.95rem;
  color: var(--text, #e8e8ec);
  min-height: 52px;
  -webkit-tap-highlight-color: transparent;
  user-select: none;
}
.lo-quiz-option:hover:not(:disabled) {
  border-color: var(--orange, #fb923c);
  background: rgba(251, 146, 60, 0.05);
  transform: translateY(-1px);
}
.lo-quiz-option:active:not(:disabled) {
  transform: scale(0.98);
}
.lo-quiz-option-key {
  display: flex;
  align-items: center;
  justify-content: center;
  width: 28px;
  height: 28px;
  border-radius: 8px;
  background: var(--border, #1e1e28);
  font-size: 0.75rem;
  font-weight: 700;
  color: var(--dim, #8888a0);
  flex-shrink: 0;
  transition: all 0.2s var(--lo-ease);
}
.lo-quiz-option:hover:not(:disabled) .lo-quiz-option-key {
  background: rgba(251, 146, 60, 0.15);
  color: var(--orange, #fb923c);
}
.lo-quiz-option-text {
  flex: 1;
  line-height: 1.5;
}

/* ── Option States ── */
.lo-quiz-option.option-correct {
  border-color: var(--green, #4ade80) !important;
  background: rgba(74, 222, 128, 0.08) !important;
  animation: lo-quiz-correct 0.4s var(--lo-ease-bounce);
}
.lo-quiz-option.option-correct .lo-quiz-option-key {
  background: var(--green, #4ade80);
  color: #000;
}
.lo-quiz-option.option-wrong {
  border-color: var(--red, #f87171) !important;
  background: rgba(248, 113, 113, 0.06) !important;
  animation: lo-quiz-wrong 0.4s var(--lo-ease);
}
.lo-quiz-option.option-wrong .lo-quiz-option-key {
  background: var(--red, #f87171);
  color: #000;
}
.lo-quiz-option.option-dimmed {
  opacity: 0.4;
}
.lo-quiz-option.option-selected {
  border-color: var(--orange, #fb923c);
}

@keyframes lo-quiz-correct {
  0% { transform: scale(1); }
  30% { transform: scale(1.02); }
  100% { transform: scale(1); }
}
@keyframes lo-quiz-wrong {
  0%, 100% { transform: translateX(0); }
  20% { transform: translateX(-4px); }
  40% { transform: translateX(4px); }
  60% { transform: translateX(-3px); }
  80% { transform: translateX(2px); }
}

/* Feedback */
.lo-quiz-feedback {
  display: flex;
  flex-direction: column;
  gap: 1rem;
  margin-top: 1.25rem;
  padding: 1.25rem;
  border-radius: var(--lo-radius-sm);
  animation: lo-quiz-fadeUp 0.3s var(--lo-ease);
  font-size: 0.9rem;
  line-height: 1.6;
  color: var(--dim, #8888a0);
}
.lo-quiz-feedback-content {
  display: flex;
  align-items: flex-start;
  gap: 0.75rem;
}
.lo-quiz-btn-next {
  align-self: flex-end;
  padding: 0.6rem 1.5rem;
  border-radius: var(--lo-radius-sm);
  background: var(--purple, #c084fc);
  border: none;
  color: #000;
  font-weight: 700;
  font-size: 0.85rem;
  cursor: pointer;
  transition: all 0.2s var(--lo-ease);
  letter-spacing: 0.01em;
}
.lo-quiz-btn-next:hover {
  background: #d4a0ff;
  transform: translateY(-1px);
}
.lo-quiz-btn-next:focus-visible {
  outline: 2px solid var(--purple, #c084fc);
  outline-offset: 2px;
}
.lo-quiz-feedback.feedback-correct {
  background: rgba(74, 222, 128, 0.06);
  border: 1px solid rgba(74, 222, 128, 0.15);
}
.lo-quiz-feedback.feedback-wrong {
  background: rgba(251, 146, 60, 0.06);
  border: 1px solid rgba(251, 146, 60, 0.15);
}
.lo-quiz-feedback-icon {
  font-weight: 700;
  font-size: 1rem;
  flex-shrink: 0;
  margin-top: 1px;
}
.feedback-correct .lo-quiz-feedback-icon { color: var(--green, #4ade80); }
.feedback-wrong .lo-quiz-feedback-icon { color: var(--orange, #fb923c); }

@keyframes lo-quiz-fadeUp {
  from { opacity: 0; transform: translateY(8px); }
  to { opacity: 1; transform: translateY(0); }
}

/* ── Results ── */
.lo-quiz-results {
  text-align: center;
  padding: 2rem 0;
  animation: lo-quiz-fadeUp 0.5s var(--lo-ease);
}
.lo-quiz-results-emoji {
  font-size: 3.5rem;
  margin-bottom: 0.75rem;
}
.lo-quiz-results-score {
  font-size: 2.5rem;
  font-weight: 800;
  letter-spacing: -1px;
  color: var(--text, #e8e8ec);
  margin-bottom: 0.5rem;
}
.lo-quiz-results-msg {
  color: var(--dim, #8888a0);
  font-size: 1rem;
  margin-bottom: 2rem;
  max-width: 400px;
  margin-left: auto;
  margin-right: auto;
}

/* Results actions */
.lo-quiz-results-actions {
  display: flex;
  gap: 0.75rem;
  justify-content: center;
  margin-top: 1.5rem;
}
.lo-quiz-btn-retry {
  padding: 0.75rem 2rem;
  border-radius: var(--lo-radius-sm);
  background: var(--surface, #111114);
  border: 1.5px solid var(--border, #1e1e28);
  color: var(--text, #e8e8ec);
  font-weight: 600;
  font-size: 0.9rem;
  cursor: pointer;
  transition: all 0.2s var(--lo-ease);
}
.lo-quiz-btn-retry:hover {
  border-color: var(--orange, #fb923c);
  background: rgba(251, 146, 60, 0.05);
}

/* Review list */
.lo-quiz-review {
  text-align: left;
  max-width: 500px;
  margin: 0 auto 1.5rem;
  display: flex;
  flex-direction: column;
  gap: 0.5rem;
}
.lo-quiz-review-item {
  display: flex;
  align-items: flex-start;
  gap: 0.5rem;
  padding: 0.75rem 1rem;
  border-radius: var(--lo-radius-sm);
  background: var(--surface, #111114);
  font-size: 0.85rem;
}
.lo-quiz-review-item.correct .lo-quiz-review-icon { color: var(--green, #4ade80); }
.lo-quiz-review-item.wrong .lo-quiz-review-icon { color: var(--red, #f87171); }
.lo-quiz-review-icon {
  font-weight: 700;
  flex-shrink: 0;
  margin-top: 1px;
}
.lo-quiz-review-q {
  color: var(--text, #e8e8ec);
  font-weight: 500;
}
.lo-quiz-review-explain {
  color: var(--dim, #8888a0);
  font-size: 0.8rem;
  margin-top: 0.25rem;
  line-height: 1.5;
}

/* ═══════════════════════════════════════════════════════════
   2. MATCH CONNECT — Drag & Drop Matching
   ═══════════════════════════════════════════════════════════ */

.lo-match {
  max-width: 700px;
  margin: 2rem auto;
  padding: 0 1rem;
}
.lo-match-header {
  text-align: center;
  margin-bottom: 1.5rem;
}
.lo-match-title {
  font-size: 1.1rem;
  font-weight: 700;
  color: var(--text, #e8e8ec);
  margin-bottom: 0.25rem;
}
.lo-match-sub {
  font-size: 0.8rem;
  color: var(--dim, #8888a0);
}
.lo-match-board {
  display: grid;
  grid-template-columns: 1fr 60px 1fr;
  gap: 0.75rem;
  align-items: start;
}
.lo-match-col {
  display: flex;
  flex-direction: column;
  gap: 0.75rem;
}
.lo-match-item {
  padding: 0.9rem 1rem;
  background: var(--surface, #111114);
  border: 1.5px solid var(--border, #1e1e28);
  border-radius: var(--lo-radius-sm);
  font-size: 0.9rem;
  color: var(--text, #e8e8ec);
  cursor: pointer;
  transition: all 0.2s var(--lo-ease);
  user-select: none;
  -webkit-tap-highlight-color: transparent;
  min-height: 48px;
  display: flex;
  align-items: center;
}
.lo-match-item:hover { border-color: var(--orange, #fb923c); }
.lo-match-item.match-selected {
  border-color: var(--orange, #fb923c);
  background: rgba(251, 146, 60, 0.08);
  box-shadow: 0 0 12px rgba(251, 146, 60, 0.12);
}
.lo-match-item.match-correct {
  border-color: var(--green, #4ade80);
  background: rgba(74, 222, 128, 0.06);
  animation: lo-quiz-correct 0.4s var(--lo-ease-bounce);
}
.lo-match-item.match-wrong {
  border-color: var(--red, #f87171);
  animation: lo-quiz-wrong 0.4s var(--lo-ease);
}
.lo-match-item.match-done {
  opacity: 0.5;
  pointer-events: none;
}

/* SVG lines container */
.lo-match-lines {
  position: relative;
  min-height: 100%;
}
.lo-match-lines svg {
  position: absolute;
  top: 0;
  left: 0;
  width: 100%;
  height: 100%;
  pointer-events: none;
}
.lo-match-line {
  stroke: var(--orange, #fb923c);
  stroke-width: 2;
  fill: none;
  opacity: 0.6;
  transition: opacity 0.3s;
}
.lo-match-line.line-correct {
  stroke: var(--green, #4ade80);
  opacity: 1;
}
.lo-match-line.line-wrong {
  stroke: var(--red, #f87171);
  opacity: 1;
}

/* Match results */
.lo-match-result {
  text-align: center;
  margin-top: 1.5rem;
  padding: 1rem;
  border-radius: var(--lo-radius);
  background: rgba(74, 222, 128, 0.06);
  border: 1px solid rgba(74, 222, 128, 0.15);
  animation: lo-quiz-fadeUp 0.4s var(--lo-ease);
}
.lo-match-result-text {
  font-weight: 600;
  color: var(--green, #4ade80);
}

/* ═══════════════════════════════════════════════════════════
   3. FLASH DECK — Spaced Repetition Cards
   ═══════════════════════════════════════════════════════════ */

.lo-flash {
  max-width: 500px;
  margin: 2rem auto;
  padding: 0 1rem;
  perspective: 1000px;
}
.lo-flash-meta {
  display: flex;
  justify-content: space-between;
  align-items: center;
  margin-bottom: 1rem;
}
.lo-flash-counter {
  font-size: 0.8rem;
  font-weight: 600;
  color: var(--dim, #8888a0);
}
.lo-flash-mastery {
  display: flex;
  align-items: center;
  gap: 0.5rem;
  font-size: 0.8rem;
  color: var(--dim, #8888a0);
}
.lo-flash-mastery-ring {
  width: 24px;
  height: 24px;
}
.lo-flash-mastery-ring circle {
  fill: none;
  stroke-width: 3;
}
.lo-flash-mastery-bg { stroke: var(--border, #1e1e28); }
.lo-flash-mastery-fill {
  stroke: var(--green, #4ade80);
  stroke-linecap: round;
  transition: stroke-dashoffset 0.5s var(--lo-ease);
  transform: rotate(-90deg);
  transform-origin: center;
}

/* Card stack */
.lo-flash-stack {
  position: relative;
  min-height: 280px;
  margin-bottom: 1.5rem;
}
.lo-flash-card {
  position: absolute;
  top: 0;
  left: 0;
  width: 100%;
  min-height: 260px;
  border-radius: var(--lo-radius);
  cursor: pointer;
  transition: transform 0.5s var(--lo-ease);
  transform-style: preserve-3d;
  -webkit-tap-highlight-color: transparent;
  user-select: none;
}
.lo-flash-card.flipped {
  transform: rotateY(180deg);
}
.lo-flash-card-face {
  position: absolute;
  top: 0;
  left: 0;
  width: 100%;
  min-height: 260px;
  backface-visibility: hidden;
  border-radius: var(--lo-radius);
  display: flex;
  flex-direction: column;
  align-items: center;
  justify-content: center;
  padding: 2rem;
  text-align: center;
}
.lo-flash-front {
  background: var(--surface, #111114);
  border: 1.5px solid var(--border, #1e1e28);
}
.lo-flash-back {
  background: var(--surface2, #18181c);
  border: 1.5px solid var(--border2, #2a2a38);
  transform: rotateY(180deg);
}
.lo-flash-card-q {
  font-size: 1.2rem;
  font-weight: 700;
  color: var(--text, #e8e8ec);
  line-height: 1.5;
  margin-bottom: 1rem;
}
.lo-flash-card-a {
  font-size: 1rem;
  color: var(--dim, #8888a0);
  line-height: 1.6;
}
.lo-flash-tap-hint {
  font-size: 0.75rem;
  color: var(--border2, #2a2a38);
  margin-top: auto;
  padding-top: 1rem;
}

/* Swipe actions */
.lo-flash-actions {
  display: flex;
  justify-content: center;
  gap: 1.5rem;
}
.lo-flash-btn {
  display: flex;
  align-items: center;
  justify-content: center;
  gap: 0.5rem;
  padding: 0.75rem 1.5rem;
  border-radius: var(--lo-radius-sm);
  border: 1.5px solid var(--border, #1e1e28);
  background: var(--surface, #111114);
  color: var(--dim, #8888a0);
  font-weight: 600;
  font-size: 0.85rem;
  cursor: pointer;
  transition: all 0.2s var(--lo-ease);
  -webkit-tap-highlight-color: transparent;
}
.lo-flash-btn-again:hover {
  border-color: var(--orange, #fb923c);
  color: var(--orange, #fb923c);
}
.lo-flash-btn-got:hover {
  border-color: var(--green, #4ade80);
  color: var(--green, #4ade80);
}
.lo-flash-btn-icon { font-size: 1.1rem; }

/* Swipe animation */
.lo-flash-card.swipe-left {
  animation: lo-flash-swipeLeft 0.4s var(--lo-ease) forwards;
}
.lo-flash-card.swipe-right {
  animation: lo-flash-swipeRight 0.4s var(--lo-ease) forwards;
}
@keyframes lo-flash-swipeLeft {
  to { transform: translateX(-120%) rotate(-8deg); opacity: 0; }
}
@keyframes lo-flash-swipeRight {
  to { transform: translateX(120%) rotate(8deg); opacity: 0; }
}

/* ═══════════════════════════════════════════════════════════
   4. SORT STACK — Drag to Reorder
   ═══════════════════════════════════════════════════════════ */

.lo-sort {
  max-width: 600px;
  margin: 2rem auto;
  padding: 0 1rem;
}
.lo-sort-header {
  text-align: center;
  margin-bottom: 1.5rem;
}
.lo-sort-title {
  font-size: 1.1rem;
  font-weight: 700;
  color: var(--text, #e8e8ec);
}
.lo-sort-sub {
  font-size: 0.8rem;
  color: var(--dim, #8888a0);
  margin-top: 0.25rem;
}
.lo-sort-list {
  display: flex;
  flex-direction: column;
  gap: 0.5rem;
}
.lo-sort-item {
  display: flex;
  align-items: center;
  gap: 0.75rem;
  padding: 0.85rem 1rem;
  background: var(--surface, #111114);
  border: 1.5px solid var(--border, #1e1e28);
  border-radius: var(--lo-radius-sm);
  cursor: grab;
  transition: all 0.2s var(--lo-ease);
  user-select: none;
  -webkit-tap-highlight-color: transparent;
}
.lo-sort-item:active { cursor: grabbing; }
.lo-sort-item:hover { border-color: var(--border2, #2a2a38); }
.lo-sort-item.sort-dragging {
  opacity: 0.5;
  border-style: dashed;
}
.lo-sort-item.sort-over {
  border-color: var(--orange, #fb923c);
  background: rgba(251, 146, 60, 0.05);
}
.lo-sort-item.sort-correct {
  border-color: var(--green, #4ade80);
  animation: lo-quiz-correct 0.3s var(--lo-ease-bounce);
}
.lo-sort-handle {
  color: var(--border2, #2a2a38);
  font-size: 1rem;
  flex-shrink: 0;
  transition: color 0.2s;
}
.lo-sort-item:hover .lo-sort-handle { color: var(--dim, #8888a0); }
.lo-sort-num {
  width: 24px;
  height: 24px;
  border-radius: 6px;
  background: var(--border, #1e1e28);
  display: flex;
  align-items: center;
  justify-content: center;
  font-size: 0.7rem;
  font-weight: 700;
  color: var(--dim, #8888a0);
  flex-shrink: 0;
}
.lo-sort-text {
  font-size: 0.9rem;
  color: var(--text, #e8e8ec);
  flex: 1;
}
.lo-sort-check {
  padding: 0.75rem 2rem;
  border-radius: var(--lo-radius-sm);
  background: var(--surface, #111114);
  border: 1.5px solid var(--border, #1e1e28);
  color: var(--text, #e8e8ec);
  font-weight: 600;
  font-size: 0.9rem;
  cursor: pointer;
  margin: 1.25rem auto 0;
  display: block;
  transition: all 0.2s var(--lo-ease);
}
.lo-sort-check:hover {
  border-color: var(--orange, #fb923c);
  background: rgba(251, 146, 60, 0.05);
}
.lo-sort-result {
  text-align: center;
  margin-top: 1rem;
  padding: 0.75rem;
  border-radius: var(--lo-radius-sm);
  font-size: 0.9rem;
  font-weight: 600;
  animation: lo-quiz-fadeUp 0.3s var(--lo-ease);
}
.lo-sort-result.sort-success {
  background: rgba(74, 222, 128, 0.06);
  border: 1px solid rgba(74, 222, 128, 0.15);
  color: var(--green, #4ade80);
}
.lo-sort-result.sort-tryagain {
  background: rgba(251, 146, 60, 0.06);
  border: 1px solid rgba(251, 146, 60, 0.15);
  color: var(--orange, #fb923c);
}

/* ═══════════════════════════════════════════════════════════
   5. CITATION — Academic Reference
   ═══════════════════════════════════════════════════════════ */

.lo-cite {
  display: inline;
  position: relative;
}
.lo-cite-ref {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  width: 16px;
  height: 16px;
  font-size: 0.6rem;
  font-weight: 700;
  color: var(--orange, #fb923c);
  background: rgba(251, 146, 60, 0.1);
  border-radius: 4px;
  cursor: pointer;
  vertical-align: super;
  margin-left: 1px;
  transition: all 0.15s;
  line-height: 1;
}
.lo-cite-ref:hover {
  background: rgba(251, 146, 60, 0.2);
  transform: scale(1.1);
}
.lo-cite-tooltip {
  position: absolute;
  bottom: calc(100% + 8px);
  left: 50%;
  transform: translateX(-50%);
  width: max-content;
  max-width: 320px;
  padding: 0.75rem 1rem;
  background: var(--surface2, #18181c);
  border: 1px solid var(--border, #1e1e28);
  border-radius: var(--lo-radius-sm);
  box-shadow: var(--lo-shadow-lift);
  font-size: 0.78rem;
  color: var(--dim, #8888a0);
  line-height: 1.5;
  z-index: 100;
  animation: lo-quiz-fadeUp 0.2s var(--lo-ease);
  pointer-events: auto;
}
.lo-cite-tooltip::after {
  content: '';
  position: absolute;
  top: 100%;
  left: 50%;
  transform: translateX(-50%);
  border: 6px solid transparent;
  border-top-color: var(--border, #1e1e28);
}
.lo-cite-tooltip-title {
  font-weight: 600;
  color: var(--text, #e8e8ec);
  margin-bottom: 0.25rem;
}
.lo-cite-tooltip-authors {
  font-style: italic;
}
.lo-cite-tooltip-source {
  color: var(--orange, #fb923c);
  font-size: 0.72rem;
}

/* ═══════════════════════════════════════════════════════════
   6. PIXEL QUEST — 8-Bit Game
   ═══════════════════════════════════════════════════════════ */

.lo-pixel {
  max-width: 500px;
  margin: 2rem auto;
  padding: 0 1rem;
}
.lo-pixel-screen {
  width: 100%;
  aspect-ratio: 10 / 9;
  background: #0f380f;
  border: 3px solid #306230;
  border-radius: var(--lo-radius);
  overflow: hidden;
  position: relative;
  image-rendering: pixelated;
  box-shadow: inset 0 0 30px rgba(0, 0, 0, 0.5);
}
.lo-pixel-canvas {
  width: 100%;
  height: 100%;
  display: block;
  image-rendering: pixelated;
  image-rendering: crisp-edges;
}
.lo-pixel-hud {
  position: absolute;
  top: 8px;
  left: 8px;
  right: 8px;
  display: flex;
  justify-content: space-between;
  font-family: 'Press Start 2P', monospace, monospace;
  font-size: 8px;
  color: #9bbc0f;
  text-shadow: 1px 1px 0 #0f380f;
  pointer-events: none;
}
.lo-pixel-controls {
  display: flex;
  justify-content: space-between;
  align-items: center;
  margin-top: 1rem;
  padding: 0 0.5rem;
}

/* D-pad */
.lo-pixel-dpad {
  display: grid;
  grid-template-columns: 44px 44px 44px;
  grid-template-rows: 44px 44px 44px;
  gap: 2px;
}
.lo-pixel-dpad-btn {
  width: 44px;
  height: 44px;
  border-radius: 6px;
  background: var(--surface, #111114);
  border: 1.5px solid var(--border, #1e1e28);
  color: var(--dim, #8888a0);
  font-size: 1.1rem;
  display: flex;
  align-items: center;
  justify-content: center;
  cursor: pointer;
  -webkit-tap-highlight-color: transparent;
  user-select: none;
  transition: all 0.1s;
}
.lo-pixel-dpad-btn:active {
  background: var(--border, #1e1e28);
  transform: scale(0.92);
}
.lo-pixel-dpad-center {
  background: transparent;
  border: none;
  cursor: default;
}

/* A/B buttons */
.lo-pixel-ab {
  display: flex;
  gap: 1rem;
  align-items: center;
}
.lo-pixel-ab-btn {
  width: 52px;
  height: 52px;
  border-radius: 50%;
  background: var(--surface, #111114);
  border: 2px solid var(--border, #1e1e28);
  color: var(--dim, #8888a0);
  font-size: 0.85rem;
  font-weight: 800;
  display: flex;
  align-items: center;
  justify-content: center;
  cursor: pointer;
  -webkit-tap-highlight-color: transparent;
  user-select: none;
  transition: all 0.1s;
}
.lo-pixel-ab-btn:active {
  background: var(--border, #1e1e28);
  transform: scale(0.92);
}
.lo-pixel-ab-btn.btn-a {
  border-color: var(--green, #4ade80);
  color: var(--green, #4ade80);
}
.lo-pixel-ab-btn.btn-b {
  border-color: var(--red, #f87171);
  color: var(--red, #f87171);
}

/* ═══════════════════════════════════════════════════════════
   7. WHITEBOARD — FigJam Canvas
   ═══════════════════════════════════════════════════════════ */

.lo-board {
  margin: 2rem auto;
  max-width: 900px;
  padding: 0 1rem;
}
.lo-board-canvas-wrap {
  position: relative;
  width: 100%;
  aspect-ratio: 16 / 10;
  background: var(--surface, #111114);
  border: 1.5px solid var(--border, #1e1e28);
  border-radius: var(--lo-radius);
  overflow: hidden;
  cursor: crosshair;
  touch-action: none;
}
.lo-board-canvas {
  width: 100%;
  height: 100%;
  display: block;
}

/* Toolbar */
.lo-board-toolbar {
  display: flex;
  justify-content: center;
  gap: 4px;
  margin-top: 0.75rem;
  padding: 0.5rem;
  background: var(--surface, #111114);
  border: 1px solid var(--border, #1e1e28);
  border-radius: var(--lo-radius-sm);
}
.lo-board-tool {
  width: 40px;
  height: 40px;
  border-radius: 8px;
  background: transparent;
  border: 1.5px solid transparent;
  color: var(--dim, #8888a0);
  font-size: 1rem;
  display: flex;
  align-items: center;
  justify-content: center;
  cursor: pointer;
  transition: all 0.15s;
  -webkit-tap-highlight-color: transparent;
}
.lo-board-tool:hover {
  background: var(--border, #1e1e28);
  color: var(--text, #e8e8ec);
}
.lo-board-tool.tool-active {
  border-color: var(--orange, #fb923c);
  background: rgba(251, 146, 60, 0.08);
  color: var(--orange, #fb923c);
}
.lo-board-divider {
  width: 1px;
  background: var(--border, #1e1e28);
  margin: 4px 4px;
}

/* Color picker */
.lo-board-colors {
  display: flex;
  gap: 4px;
  align-items: center;
}
.lo-board-color {
  width: 20px;
  height: 20px;
  border-radius: 50%;
  border: 2px solid transparent;
  cursor: pointer;
  transition: all 0.15s;
}
.lo-board-color:hover { transform: scale(1.15); }
.lo-board-color.color-active {
  border-color: var(--text, #e8e8ec);
  transform: scale(1.15);
}

/* Sticky note on canvas */
.lo-board-sticky {
  position: absolute;
  width: 140px;
  min-height: 100px;
  padding: 12px;
  border-radius: 4px;
  font-size: 0.78rem;
  line-height: 1.4;
  cursor: move;
  box-shadow: 0 2px 8px rgba(0, 0, 0, 0.3);
  user-select: none;
}
.lo-board-sticky[contenteditable] {
  cursor: text;
  outline: none;
}

/* ═══════════════════════════════════════════════════════════
   RESPONSIVE
   ═══════════════════════════════════════════════════════════ */

@media (max-width: 600px) {
  .lo-quiz-q { font-size: 1.15rem; }
  .lo-quiz-option { padding: 0.85rem 1rem; font-size: 0.88rem; }

  /* MatchConnect mobile: stack columns with labels */
  .lo-match-board { grid-template-columns: 1fr; gap: 0.5rem; }
  .lo-match-lines { display: none; }
  .lo-match-col:first-child::before {
    content: 'Terms';
    display: block;
    font-size: 0.7rem;
    font-weight: 700;
    text-transform: uppercase;
    letter-spacing: 1px;
    color: var(--orange, #fb923c);
    margin-bottom: 0.5rem;
    padding-left: 0.25rem;
  }
  .lo-match-col:last-child::before {
    content: 'Definitions';
    display: block;
    font-size: 0.7rem;
    font-weight: 700;
    text-transform: uppercase;
    letter-spacing: 1px;
    color: var(--purple, #c084fc);
    margin-bottom: 0.5rem;
    margin-top: 0.75rem;
    padding-left: 0.25rem;
  }
  .lo-match-col:last-child .lo-match-item {
    border-left: 2px solid var(--purple, #c084fc);
  }

  .lo-flash-card-face { min-height: 220px; padding: 1.5rem; }

  /* PixelQuest: maintain 44px WCAG touch targets */
  .lo-pixel-dpad-btn { width: 44px; height: 44px; }
  .lo-pixel-ab-btn { width: 48px; height: 48px; }

  .lo-board-canvas-wrap { aspect-ratio: 4 / 3; }

  /* Ensure minimum touch target on all buttons */
  .lo-flash-btn { min-height: 44px; }
  .lo-sort-check { min-height: 44px; }
  .lo-quiz-btn-next { min-height: 44px; }
  .lo-quiz-btn-retry { min-height: 44px; }
}