/* ═══════════════════════════════════════════════════════════
   LIKE ONE ACADEMY — Learning Components
   Apple Design: Read + Quiz + Flash Cards. Nothing else.
   ═══════════════════════════════════════════════════════════ */

/* ── 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-radius: 14px;
  --lo-radius-sm: 10px;
  --lo-transition: 0.25s var(--lo-ease);
}


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

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

.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);
}

.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;
}

.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); }

.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;
}

.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; }

.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); }
}

.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);
}
.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); }
}

.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;
}

.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);
}

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

/* Collapsible wrapper */
.lo-flash-wrapper {
  max-width: 500px;
  margin: 2rem auto;
  border: 1px solid var(--border, #1e1e28);
  border-radius: var(--lo-radius);
  overflow: hidden;
}

.lo-flash-toggle {
  display: flex;
  align-items: center;
  gap: 0.75rem;
  width: 100%;
  padding: 0.85rem 1.25rem;
  background: var(--surface, #111114);
  border: none;
  color: var(--text, #e8e8ec);
  cursor: pointer;
  font-size: 0.9rem;
  font-weight: 600;
  text-align: left;
  transition: background 0.15s;
}
.lo-flash-toggle:hover { background: var(--surface2, #18181c); }

.lo-flash-toggle-icon {
  color: var(--dim, #8888a0);
  font-size: 0.75rem;
  flex-shrink: 0;
  transition: transform 0.2s var(--lo-ease);
}
.lo-flash-toggle-title { flex: 1; }
.lo-flash-toggle-count {
  font-size: 0.75rem;
  color: var(--dim, #8888a0);
  font-weight: 500;
}
.lo-flash-toggle-progress {
  font-size: 0.75rem;
  color: var(--orange, #fb923c);
  font-weight: 500;
}
.lo-flash-toggle-done {
  font-size: 0.75rem;
  color: var(--green, #4ade80);
  font-weight: 600;
}

.lo-flash {
  padding: 0 1rem 1rem;
  perspective: 1000px;
}
.lo-flash-meta {
  display: flex;
  justify-content: space-between;
  align-items: center;
  margin-bottom: 1rem;
  padding-top: 0.5rem;
}
.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;
}

.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;
}

.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; }

.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; }
}


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

@media (max-width: 600px) {
  .lo-quiz-q { font-size: 1.15rem; }
  .lo-quiz-option { padding: 0.85rem 1rem; font-size: 0.88rem; }
  .lo-flash-card-face { min-height: 220px; padding: 1.5rem; }
  .lo-flash-btn { min-height: 44px; }
  .lo-quiz-btn-next { min-height: 44px; }
  .lo-quiz-btn-retry { min-height: 44px; }
}