/* =====================================================
   SENSEI LMS SLIDESHOW MOCKUP V2 - COMPONENT STYLES
   Industrial Hygiene Fundamentals Course
   ===================================================== */

/* =====================================================
   SPEAKER ICON (Text-to-Speech)
   ===================================================== */
.speaker-icon {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  width: 18px;
  height: 18px;
  margin-left: 6px;
  opacity: 0.5;
  cursor: pointer;
  transition: opacity var(--transition-fast), transform var(--transition-fast);
  vertical-align: middle;
}

.speaker-icon:hover {
  opacity: 1;
  transform: scale(1.1);
}

.speaker-icon svg {
  width: 100%;
  height: 100%;
  fill: currentColor;
}

/* Dictionary word styling */
.dictionary-word {
  position: relative;
  border-bottom: 1px dotted rgba(59, 130, 246, 0.6);
  cursor: help;
  color: rgba(147, 197, 253, 1);
  transition: all var(--transition-fast);
}

.dictionary-word:hover {
  border-bottom-color: rgba(59, 130, 246, 1);
  color: rgba(191, 219, 254, 1);
}

.dictionary-word .info-icon {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  width: 14px;
  height: 14px;
  margin-left: 3px;
  background: rgba(59, 130, 246, 0.3);
  border-radius: 50%;
  font-size: 10px;
  font-weight: bold;
  vertical-align: super;
  line-height: 1;
  padding: 2px;
}

/* Dictionary tooltip */
.dictionary-tooltip {
  position: fixed;
  background: rgba(0, 0, 0, 0.95);
  color: var(--color-text-primary);
  padding: var(--spacing-md);
  border-radius: var(--radius-md);
  font-size: var(--font-size-small);
  max-width: 350px;
  box-shadow: 0 10px 40px rgba(0, 0, 0, 0.5);
  z-index: 10000;
  pointer-events: none;
  border: 1px solid rgba(59, 130, 246, 0.4);
}

/* =====================================================
   CALLOUT / INFO BLOCKS (Book-style asides)
   ===================================================== */
.callout-box {
  background: linear-gradient(135deg, rgba(239, 68, 68, 0.15), rgba(239, 68, 68, 0.08));
  border-left: 4px solid rgba(239, 68, 68, 0.8);
  padding: var(--spacing-lg);
  margin: var(--spacing-xl) 0;
  border-radius: var(--radius-md);
  box-shadow: 0 4px 12px rgba(0, 0, 0, 0.3);
  position: relative;
}

.callout-box.float-right {
  float: right;
  width: 40%;
  margin: var(--spacing-sm) 0 var(--spacing-lg) var(--spacing-xl);
}

.callout-box.float-left {
  float: left;
  width: 40%;
  margin: var(--spacing-sm) var(--spacing-xl) var(--spacing-lg) 0;
}

.callout-box.warning {
  background: linear-gradient(135deg, rgba(245, 158, 11, 0.15), rgba(245, 158, 11, 0.08));
  border-left-color: rgba(245, 158, 11, 0.8);
}

.callout-box.info {
  background: linear-gradient(135deg, rgba(59, 130, 246, 0.15), rgba(59, 130, 246, 0.08));
  border-left-color: rgba(59, 130, 246, 0.8);
}

.callout-box.success {
  background: linear-gradient(135deg, rgba(16, 185, 129, 0.15), rgba(16, 185, 129, 0.08));
  border-left-color: rgba(16, 185, 129, 0.8);
}

.callout-icon {
  font-size: 2rem;
  margin-bottom: var(--spacing-sm);
  display: block;
  opacity: 0.9;
}

.callout-title {
  font-size: var(--font-size-h4);
  font-weight: var(--font-weight-bold);
  color: var(--color-text-primary);
  margin-bottom: var(--spacing-sm);
  display: flex;
  align-items: center;
  gap: var(--spacing-sm);
}

.callout-stat {
  font-size: 3rem;
  font-weight: var(--font-weight-bold);
  color: var(--color-text-primary);
  line-height: 1;
  margin-bottom: var(--spacing-xs);
  text-align: center;
  display: block;
}

.callout-text {
  font-size: var(--font-size-small);
  color: var(--color-text-secondary);
  line-height: 1.6;
  margin: 0;
  text-align: center;
}

.callout-box p:last-child {
  margin-bottom: 0;
}

/* Mobile adjustments */
@media (max-width: 767px) {
  .callout-box.float-right,
  .callout-box.float-left {
    float: none;
    width: 100%;
    margin: var(--spacing-lg) 0;
  }
}

.dictionary-tooltip-image {
  width: 100%;
  height: 120px;
  object-fit: cover;
  border-radius: var(--radius-sm);
  margin-bottom: var(--spacing-sm);
}

.dictionary-tooltip-word {
  font-size: var(--font-size-h4);
  font-weight: var(--font-weight-bold);
  margin-bottom: var(--spacing-xs);
  color: rgba(147, 197, 253, 1);
}

.dictionary-tooltip-definition {
  line-height: 1.6;
  color: var(--color-text-secondary);
}

/* =====================================================
   GLOSSARY TERMS & TOOLTIP
   ===================================================== */
.glossary-term {
  color: var(--color-text-primary);
  border-bottom: 2px dotted rgba(255, 255, 255, 0.5);
  cursor: help;
  position: relative;
  transition: border-color var(--transition-fast);
}

.glossary-term:hover {
  border-bottom-color: rgba(255, 255, 255, 0.9);
}

.glossary-tooltip {
  position: fixed;
  background: rgba(0, 0, 0, 0.95);
  color: var(--color-text-primary);
  padding: var(--spacing-sm) var(--spacing-md);
  border-radius: var(--radius-md);
  font-size: var(--font-size-small);
  max-width: 300px;
  box-shadow: var(--shadow-xl);
  z-index: 10000;
  pointer-events: none;
  border: 1px solid rgba(255, 255, 255, 0.2);
}

.tooltip-content {
  line-height: 1.5;
}

/* =====================================================
   FLASHCARD COMPONENT
   ===================================================== */
.flashcard-container {
  display: flex;
  align-items: center;
  justify-content: center;
  min-height: 400px;
}

.flashcard {
  width: 100%;
  max-width: 600px;
  height: 400px;
  position: relative;
  cursor: pointer;
  perspective: 1000px;
}

.flashcard-front,
.flashcard-back {
  position: absolute;
  width: 100%;
  height: 100%;
  backface-visibility: hidden;
  display: flex;
  flex-direction: column;
  align-items: center;
  justify-content: center;
  padding: var(--spacing-xl);
  background: rgba(255, 255, 255, 0.15);
  border: 2px solid rgba(255, 255, 255, 0.3);
  border-radius: var(--radius-lg);
  backdrop-filter: blur(10px);
  transition: transform var(--transition-slow);
}

.flashcard-front {
  transform: rotateY(0deg);
}

.flashcard-back {
  transform: rotateY(180deg);
}

.flashcard.flipped .flashcard-front {
  transform: rotateY(-180deg);
}

.flashcard.flipped .flashcard-back {
  transform: rotateY(0deg);
}

.flashcard h3 {
  font-size: var(--font-size-h2);
  text-align: center;
  margin-bottom: var(--spacing-lg);
}

.flashcard p {
  text-align: center;
  font-size: var(--font-size-body);
}

.flashcard-label {
  font-size: var(--font-size-small);
  color: var(--color-text-muted);
  margin-bottom: var(--spacing-md);
  text-transform: uppercase;
  letter-spacing: 1px;
}

/* =====================================================
   IMAGE HOTSPOT COMPONENT
   ===================================================== */
.hotspot-image {
  position: relative;
  display: inline-block;
  max-width: 100%;
  width: 100%;
  border-radius: var(--radius-lg);
  overflow: hidden;
}

.hotspot-image img {
  max-width: 100%;
  border-radius: var(--radius-lg);
  display: block;
}

.hotspot {
  position: absolute;
  z-index: 10;
}

.hotspot-marker {
  width: 40px;
  height: 40px;
  background: rgba(255, 107, 53, 0.4);
  border: 3px solid rgba(255, 255, 255, 0.9);
  border-radius: 50%;
  cursor: pointer;
  position: relative;
  transform: translate(-50%, -50%);
  transition: all var(--transition-fast);
  animation: pulse 2s infinite;
  display: flex;
  align-items: center;
  justify-content: center;
  color: #fff;
  font-weight: var(--font-weight-bold);
  font-size: var(--font-size-small);
}

.hotspot:hover .hotspot-marker,
.hotspot.active .hotspot-marker {
  background: rgba(255, 107, 53, 0.8);
  transform: translate(-50%, -50%) scale(1.2);
}

.hotspot-popup {
  position: absolute;
  bottom: 100%;
  left: 50%;
  transform: translateX(-50%) translateY(-10px);
  background: rgba(0, 0, 0, 0.95);
  color: var(--color-text-primary);
  padding: var(--spacing-md);
  border-radius: var(--radius-md);
  min-width: 250px;
  max-width: 350px;
  box-shadow: var(--shadow-xl);
  opacity: 0;
  pointer-events: none;
  transition: all var(--transition-normal);
  border: 1px solid rgba(255, 255, 255, 0.2);
  margin-bottom: var(--spacing-sm);
}

.hotspot:hover .hotspot-popup,
.hotspot.active .hotspot-popup {
  opacity: 1;
  transform: translateX(-50%) translateY(0);
}

.hotspot-popup h4 {
  font-size: var(--font-size-h4);
  margin-bottom: var(--spacing-xs);
  color: #ff6b35;
}

.hotspot-popup p {
  font-size: var(--font-size-small);
  margin: 0;
  line-height: 1.5;
}

.hotspot-popup::after {
  content: '';
  position: absolute;
  top: 100%;
  left: 50%;
  transform: translateX(-50%);
  width: 0;
  height: 0;
  border-left: 8px solid transparent;
  border-right: 8px solid transparent;
  border-top: 8px solid rgba(0, 0, 0, 0.95);
}

/* =====================================================
   QUIZ COMPONENT
   ===================================================== */
.quiz-header {
  margin-bottom: var(--spacing-lg);
  text-align: center;
}

.quiz-badge {
  display: inline-flex;
  align-items: center;
  gap: var(--spacing-sm);
  background: rgba(255, 255, 255, 0.1);
  padding: var(--spacing-sm) var(--spacing-lg);
  border-radius: var(--radius-full);
  margin-bottom: var(--spacing-md);
  font-size: var(--font-size-small);
  font-weight: var(--font-weight-semibold);
  color: rgba(255, 255, 255, 0.9);
  border: 2px solid rgba(255, 255, 255, 0.2);
}

.quiz-badge svg {
  color: rgba(255, 255, 255, 0.8);
}

.quiz-container {
  background: rgba(0, 0, 0, 0.3);
  border: 2px solid rgba(255, 255, 255, 0.2);
}

.quiz-question {
  padding: var(--spacing-xl);
}

.question-text {
  font-size: 2rem;
  margin-bottom: var(--spacing-sm);
  color: var(--color-text-primary);
  text-align: center;
  line-height: 1.3;
}

.question-hint {
  text-align: center;
  font-size: var(--font-size-body);
  color: var(--color-text-muted);
  margin-bottom: var(--spacing-xl);
  font-style: italic;
}

.quiz-options-checkbox {
  display: flex;
  flex-direction: column;
  gap: var(--spacing-md);
  margin-bottom: var(--spacing-xl);
}

.quiz-option-label {
  position: relative;
  display: flex;
  align-items: center;
  gap: var(--spacing-md);
  background: rgba(255, 255, 255, 0.05);
  border: 3px solid rgba(255, 255, 255, 0.2);
  padding: var(--spacing-lg);
  border-radius: var(--radius-lg);
  cursor: pointer;
  transition: all var(--transition-normal);
  min-height: 80px;
}

.quiz-option-label:hover {
  background: rgba(255, 255, 255, 0.1);
  border-color: rgba(255, 255, 255, 0.4);
  transform: translateX(8px);
  box-shadow: 0 4px 20px rgba(0, 0, 0, 0.3);
}

.quiz-checkbox {
  position: absolute;
  opacity: 0;
  cursor: pointer;
}

.checkbox-custom {
  position: relative;
  width: 32px;
  height: 32px;
  min-width: 32px;
  border: 3px solid rgba(255, 255, 255, 0.5);
  border-radius: 6px;
  background: rgba(0, 0, 0, 0.3);
  transition: all var(--transition-normal);
}

.quiz-checkbox:checked ~ .checkbox-custom {
  background: linear-gradient(135deg, #10b981, #059669);
  border-color: #10b981;
}

.quiz-checkbox:checked ~ .checkbox-custom::after {
  content: '';
  position: absolute;
  left: 9px;
  top: 4px;
  width: 8px;
  height: 14px;
  border: solid white;
  border-width: 0 3px 3px 0;
  transform: rotate(45deg);
}

.option-letter {
  display: flex;
  align-items: center;
  justify-content: center;
  width: 40px;
  height: 40px;
  min-width: 40px;
  background: rgba(255, 255, 255, 0.15);
  border-radius: 50%;
  font-size: 1.25rem;
  font-weight: var(--font-weight-bold);
  color: var(--color-text-primary);
}

.option-text {
  flex: 1;
  font-size: 1.125rem;
  line-height: 1.6;
  color: var(--color-text-secondary);
}

.quiz-option-label.correct {
  background: rgba(16, 185, 129, 0.15);
  border-color: rgba(16, 185, 129, 0.6);
}

.quiz-option-label.correct .option-letter {
  background: rgba(16, 185, 129, 0.3);
  color: #86efac;
}

.quiz-option-label.incorrect {
  background: rgba(239, 68, 68, 0.15);
  border-color: rgba(239, 68, 68, 0.6);
}

.quiz-option-label.incorrect .option-letter {
  background: rgba(239, 68, 68, 0.3);
  color: #fca5a5;
}

.quiz-option-label.disabled {
  cursor: not-allowed;
  opacity: 0.6;
}

.quiz-actions {
  text-align: center;
  margin-bottom: var(--spacing-lg);
}

.quiz-submit-btn {
  background: linear-gradient(135deg, #3b82f6, #2563eb);
  color: white;
  border: none;
  padding: var(--spacing-md) var(--spacing-2xl);
  font-size: 1.125rem;
  font-weight: var(--font-weight-semibold);
  border-radius: var(--radius-md);
  cursor: pointer;
  transition: all var(--transition-normal);
  box-shadow: 0 4px 12px rgba(59, 130, 246, 0.3);
  min-width: 200px;
}

.quiz-submit-btn:hover:not(:disabled) {
  background: linear-gradient(135deg, #2563eb, #1d4ed8);
  transform: translateY(-2px);
  box-shadow: 0 6px 20px rgba(59, 130, 246, 0.4);
}

.quiz-submit-btn:disabled {
  opacity: 0.5;
  cursor: not-allowed;
}

.quiz-feedback {
  margin-top: var(--spacing-lg);
  padding: var(--spacing-lg);
  border-radius: var(--radius-md);
  font-size: 1.125rem;
  line-height: 1.6;
}

.quiz-feedback.correct {
  background: rgba(16, 185, 129, 0.2);
  border-left: 4px solid var(--color-success);
  color: #86efac;
}

.quiz-feedback.incorrect {
  background: rgba(239, 68, 68, 0.2);
  border-left: 4px solid var(--color-error);
  color: #fca5a5;
}

/* =====================================================
   EXPANDABLE CONTENT
   ===================================================== */
.expandable-content {
  margin-bottom: var(--spacing-md);
}

.expand-trigger {
  cursor: pointer;
  transition: color var(--transition-fast);
  position: relative;
  padding-right: var(--spacing-lg);
}

.expand-trigger::after {
  content: '▼';
  position: absolute;
  right: 0;
  transition: transform var(--transition-fast);
  font-size: var(--font-size-small);
}

.expand-trigger.active::after {
  transform: rotate(180deg);
}

.expand-trigger:hover {
  color: #ff6b35;
}

.expand-content {
  margin-top: var(--spacing-sm);
  padding-left: var(--spacing-md);
  border-left: 2px solid rgba(255, 255, 255, 0.3);
}

/* =====================================================
   ACCORDION COMPONENT
   ===================================================== */
.accordion {
  display: flex;
  flex-direction: column;
  gap: var(--spacing-md);
}

.accordion-item {
  background: rgba(255, 255, 255, 0.05);
  border-radius: var(--radius-md);
  border: 1px solid rgba(255, 255, 255, 0.1);
  overflow: hidden;
}

.accordion-trigger {
  width: 100%;
  background: transparent;
  border: none;
  color: var(--color-text-primary);
  padding: var(--spacing-md) var(--spacing-lg);
  font-size: var(--font-size-h4);
  text-align: left;
  cursor: pointer;
  display: flex;
  align-items: center;
  gap: var(--spacing-md);
  transition: background var(--transition-fast);
}

.accordion-trigger:hover {
  background: rgba(255, 255, 255, 0.05);
}

.accordion-trigger.active {
  background: rgba(255, 255, 255, 0.1);
}

.accordion-icon {
  font-size: 1.5rem;
  flex-shrink: 0;
}

.accordion-title {
  flex: 1;
  font-weight: var(--font-weight-semibold);
}

.accordion-arrow {
  transition: transform var(--transition-normal);
  font-size: var(--font-size-small);
}

.accordion-trigger.active .accordion-arrow {
  transform: rotate(180deg);
}

.accordion-content {
  padding: 0 var(--spacing-lg) var(--spacing-lg) var(--spacing-lg);
  color: var(--color-text-secondary);
  line-height: 1.8;
}

.accordion-content p {
  margin-bottom: var(--spacing-md);
}

.accordion-content ol {
  margin-left: var(--spacing-lg);
}

.accordion-content li {
  margin-bottom: var(--spacing-sm);
}

/* =====================================================
   TASK LIST COMPONENT
   ===================================================== */
.task-list {
  background: rgba(255, 255, 255, 0.05);
  padding: var(--spacing-lg);
  border-radius: var(--radius-md);
  margin-bottom: var(--spacing-lg);
}

.task-item {
  display: flex;
  align-items: flex-start;
  gap: var(--spacing-md);
  padding: var(--spacing-md);
  border-bottom: 1px solid rgba(255, 255, 255, 0.1);
}

.task-item:last-child {
  border-bottom: none;
}

.task-checkbox {
  flex-shrink: 0;
  width: 20px;
  height: 20px;
  margin-top: 2px;
  cursor: pointer;
}

.task-item label {
  flex: 1;
  cursor: pointer;
  color: var(--color-text-secondary);
  line-height: 1.6;
}

.task-item input:checked + label {
  color: var(--color-text-muted);
  text-decoration: line-through;
}

.task-progress {
  margin-top: var(--spacing-lg);
}

.progress-label {
  font-size: var(--font-size-small);
  color: var(--color-text-muted);
  margin-bottom: var(--spacing-xs);
}

.progress-count {
  font-weight: var(--font-weight-semibold);
  color: var(--color-text-primary);
}

/* =====================================================
   VIDEO PLAYER COMPONENT
   ===================================================== */
.video-container {
  background: rgba(0, 0, 0, 0.5);
  border-radius: var(--radius-lg);
  overflow: hidden;
  position: relative;
}

.video-placeholder {
  width: 100%;
  aspect-ratio: 16 / 9;
  background: linear-gradient(135deg, #1a1a2e 0%, #2a2a3e 100%);
  display: flex;
  align-items: center;
  justify-content: center;
  cursor: pointer;
  transition: all var(--transition-normal);
}

.video-placeholder:hover {
  background: linear-gradient(135deg, #2a2a3e 0%, #3a3a4e 100%);
}

.play-button-large {
  width: 80px;
  height: 80px;
  background: rgba(255, 255, 255, 0.2);
  border: 3px solid rgba(255, 255, 255, 0.8);
  border-radius: 50%;
  display: flex;
  align-items: center;
  justify-content: center;
  font-size: 2rem;
  color: #fff;
  transition: all var(--transition-normal);
}

.video-placeholder:hover .play-button-large {
  background: rgba(255, 255, 255, 0.3);
  transform: scale(1.1);
}

.video-controls {
  padding: var(--spacing-md);
  background: rgba(0, 0, 0, 0.8);
  display: flex;
  align-items: center;
  gap: var(--spacing-md);
}

.play-pause {
  background: rgba(255, 255, 255, 0.2);
  border: 1px solid rgba(255, 255, 255, 0.3);
  color: #fff;
  padding: var(--spacing-xs) var(--spacing-md);
  border-radius: var(--radius-sm);
  cursor: pointer;
  font-size: var(--font-size-ui);
  transition: all var(--transition-fast);
}

.play-pause:hover {
  background: rgba(255, 255, 255, 0.3);
}

.time-display {
  font-size: var(--font-size-ui);
  color: var(--color-text-muted);
}

.volume-btn {
  background: transparent;
  border: none;
  font-size: 1.25rem;
  cursor: pointer;
  padding: var(--spacing-xs);
  transition: transform var(--transition-fast);
}

.volume-btn:hover {
  transform: scale(1.1);
}

/* =====================================================
   VIDEO TRANSCRIPT PANEL (ENHANCED FOR V2)
   ===================================================== */
.transcript-timestamp {
  font-size: var(--font-size-small);
  font-weight: var(--font-weight-semibold);
  color: var(--color-text-primary);
  margin-bottom: var(--spacing-md);
  text-align: center;
  font-variant-numeric: tabular-nums;
}

.current-time {
  color: #ff6b35;
}

.time-separator {
  margin: 0 var(--spacing-xs);
  color: var(--color-text-muted);
}

.total-time {
  color: var(--color-text-muted);
}

.transcript-content {
  flex: 1;
  overflow-y: auto;
  padding: var(--spacing-md);
  position: relative;
  scroll-behavior: smooth;
}

.transcript-content::-webkit-scrollbar {
  width: 8px;
}

.transcript-content::-webkit-scrollbar-track {
  background: rgba(255, 255, 255, 0.05);
  border-radius: var(--radius-sm);
}

.transcript-content::-webkit-scrollbar-thumb {
  background: rgba(255, 255, 255, 0.2);
  border-radius: var(--radius-sm);
}

.transcript-content::-webkit-scrollbar-thumb:hover {
  background: rgba(255, 255, 255, 0.3);
}

.transcript-segment {
  margin-bottom: var(--spacing-md);
  line-height: 2.0;
  font-size: 1.125rem;
}

/* Transcript sentences (replacing word-by-word highlighting) */
.transcript-sentence {
  padding: var(--spacing-sm);
  margin-bottom: var(--spacing-sm);
  border-radius: var(--radius-sm);
  transition: all 0.3s ease-out;
  cursor: pointer;
  position: relative;
  line-height: 1.8;
}

/* Default state - upcoming sentences */
.transcript-sentence.upcoming {
  color: rgba(255, 255, 255, 0.5);
  background: transparent;
}

/* Current sentence being spoken */
.transcript-sentence.current {
  background: rgba(255, 107, 53, 0.25);
  color: #fff;
  font-weight: 500;
  border-left: 4px solid rgba(255, 107, 53, 0.8);
  padding-left: calc(var(--spacing-sm) + 4px);
}

/* Already spoken sentences */
.transcript-sentence.spoken {
  color: rgba(255, 255, 255, 0.7);
  background: transparent;
}

.transcript-sentence:hover {
  background: rgba(255, 255, 255, 0.1);
}

.transcript-controls {
  padding: var(--spacing-md) 0 0;
  border-top: 1px solid rgba(255, 255, 255, 0.1);
  display: flex;
  gap: var(--spacing-sm);
  flex-wrap: wrap;
}

.transcript-control {
  background: rgba(255, 255, 255, 0.1);
  border: 1px solid rgba(255, 255, 255, 0.2);
  color: var(--color-text-primary);
  padding: var(--spacing-xs) var(--spacing-sm);
  border-radius: var(--radius-sm);
  font-size: var(--font-size-ui);
  cursor: pointer;
  transition: all var(--transition-fast);
}

.transcript-control:hover {
  background: rgba(255, 255, 255, 0.15);
  border-color: rgba(255, 255, 255, 0.3);
}

.transcript-control.active {
  background: rgba(255, 107, 53, 0.3);
  border-color: rgba(255, 107, 53, 0.5);
}

/* =====================================================
   FOCUS SCROLL READING MODE (NEW FOR V2)
   ===================================================== */

/* Trigger Button */
.expand-reading-btn {
  background: rgba(255, 255, 255, 0.15);
  border: 2px solid rgba(255, 255, 255, 0.3);
  color: #fff;
  padding: 16px 24px;
  border-radius: var(--radius-md);
  font-size: 1.125rem;
  cursor: pointer;
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 12px;
  transition: all 0.3s ease;
  width: 100%;
  margin-top: var(--spacing-lg);
}

.expand-reading-btn:hover {
  background: rgba(255, 255, 255, 0.25);
  border-color: rgba(255, 255, 255, 0.5);
  transform: translateY(-2px);
  box-shadow: 0 4px 12px rgba(0, 0, 0, 0.3);
}

.content-length {
  font-size: 0.875rem;
  opacity: 0.7;
}

/* Reading Mode Overlay - Now inline expansion */
.reading-mode-overlay {
  display: none;
  background: rgba(0, 0, 0, 0.4);
  backdrop-filter: blur(10px);
  border-radius: var(--radius-lg);
  padding: var(--spacing-lg);
  margin-top: var(--spacing-lg);
  max-height: 0;
  overflow: hidden;
  transition: max-height 0.4s ease-out, padding 0.4s ease-out;
  position: relative;
  z-index: 150;
}

.reading-mode-overlay:not(.hidden) {
  display: block;
  max-height: 600px;
  padding: var(--spacing-lg);
}

/* Header */
.reading-mode-header {
  padding: var(--spacing-md) 0;
  border-bottom: 1px solid rgba(255, 255, 255, 0.2);
  display: flex;
  justify-content: space-between;
  align-items: center;
  flex-shrink: 0;
  margin-bottom: var(--spacing-md);
}

.reading-mode-header h2 {
  font-size: 1.5rem;
  margin: 0;
  color: #fff;
}

.reading-mode-controls {
  display: flex;
  align-items: center;
  gap: 20px;
}

.reading-progress {
  font-size: 0.875rem;
  color: rgba(255, 255, 255, 0.7);
  font-weight: 500;
}

.close-reading-mode {
  background: rgba(255, 255, 255, 0.1);
  border: 1px solid rgba(255, 255, 255, 0.3);
  color: #fff;
  padding: 8px 16px;
  border-radius: 6px;
  cursor: pointer;
  transition: all 0.2s ease;
  font-size: var(--font-size-ui);
}

.close-reading-mode:hover {
  background: rgba(255, 255, 255, 0.2);
  border-color: rgba(255, 255, 255, 0.5);
}

/* Scrollable Content Container */
.reading-mode-content {
  overflow-y: auto;
  padding: var(--spacing-md) 0;
  max-width: 100%;
  max-height: 450px;
  position: relative;
  scroll-behavior: auto;
}

.reading-mode-content::-webkit-scrollbar {
  display: none;
}

.reading-mode-content {
  -ms-overflow-style: none;
  scrollbar-width: none;
}

/* Reading Paragraphs - Default State (Out of Focus) */
.reading-paragraph {
  margin-bottom: 32px;
  font-size: 1.125rem;
  line-height: 1.8;
  color: rgba(255, 255, 255, 0.9);
  font-weight: 400;
  opacity: 1;
  position: relative;
}

/* Remove focus transitions - all paragraphs display normally */
.reading-paragraph.in-focus,
.reading-paragraph.near-focus {
  /* No special styling - plain reading experience */
}

/* Focus indicator line (optional) */
.reading-paragraph.in-focus::before {
  content: '';
  position: absolute;
  left: -20px;
  top: 0;
  bottom: 0;
  width: 4px;
  background: linear-gradient(180deg, #10b981, #34d399);
  border-radius: 2px;
  opacity: 0.8;
}

/* Reading Progress Bar */
.reading-progress-bar {
  height: 4px;
  background: rgba(255, 255, 255, 0.1);
  position: relative;
  flex-shrink: 0;
}

.reading-progress-fill {
  height: 100%;
  background: linear-gradient(90deg, #10b981, #34d399);
  transition: width 0.3s ease-out;
}

/* =====================================================
   AI CHAT WIDGET
   ===================================================== */
.chat-widget {
  position: fixed;
  bottom: 80px;
  right: var(--spacing-lg);
  z-index: 150;
}

.chat-toggle {
  width: 60px;
  height: 60px;
  border-radius: 50%;
  background: linear-gradient(135deg, #667eea, #764ba2);
  color: #fff;
  border: none;
  cursor: pointer;
  box-shadow: var(--shadow-xl);
  display: flex;
  align-items: center;
  justify-content: center;
  transition: all var(--transition-normal);
}

.chat-toggle:hover {
  transform: scale(1.1);
  box-shadow: 0 20px 40px rgba(102, 126, 234, 0.4);
}

.chat-icon {
  font-size: 1.8rem;
}

.chat-window {
  position: absolute;
  bottom: 70px;
  right: 0;
  width: 380px;
  height: 500px;
  background: rgba(0, 0, 0, 0.95);
  backdrop-filter: blur(20px);
  border-radius: var(--radius-lg);
  border: 1px solid rgba(255, 255, 255, 0.2);
  box-shadow: var(--shadow-xl);
  display: flex;
  flex-direction: column;
  overflow: hidden;
}

.chat-header {
  padding: var(--spacing-md) var(--spacing-lg);
  background: rgba(255, 255, 255, 0.05);
  border-bottom: 1px solid rgba(255, 255, 255, 0.1);
  display: flex;
  justify-content: space-between;
  align-items: center;
}

.chat-header h3 {
  margin: 0;
  font-size: var(--font-size-h4);
}

.chat-close {
  background: transparent;
  border: none;
  color: var(--color-text-primary);
  font-size: 1.5rem;
  cursor: pointer;
  padding: 0;
  width: 30px;
  height: 30px;
  display: flex;
  align-items: center;
  justify-content: center;
  border-radius: var(--radius-sm);
  transition: background var(--transition-fast);
}

.chat-close:hover {
  background: rgba(255, 255, 255, 0.1);
}

.chat-messages {
  flex: 1;
  overflow-y: auto;
  padding: var(--spacing-md);
  display: flex;
  flex-direction: column;
  gap: var(--spacing-md);
}

.chat-message {
  max-width: 80%;
  padding: var(--spacing-sm) var(--spacing-md);
  border-radius: var(--radius-md);
  line-height: 1.5;
}

.ai-message {
  align-self: flex-start;
  background: rgba(99, 102, 241, 0.2);
  border: 1px solid rgba(99, 102, 241, 0.3);
}

.user-message {
  align-self: flex-end;
  background: rgba(255, 255, 255, 0.1);
  border: 1px solid rgba(255, 255, 255, 0.2);
}

.chat-message p {
  margin: 0;
  font-size: var(--font-size-small);
}

.chat-suggestions {
  padding: 0 var(--spacing-md);
  display: flex;
  gap: var(--spacing-xs);
  flex-wrap: wrap;
}

.suggestion-btn {
  background: rgba(255, 255, 255, 0.05);
  border: 1px solid rgba(255, 255, 255, 0.2);
  color: var(--color-text-secondary);
  padding: var(--spacing-xs) var(--spacing-sm);
  border-radius: var(--radius-full);
  font-size: var(--font-size-ui);
  cursor: pointer;
  transition: all var(--transition-fast);
}

.suggestion-btn:hover {
  background: rgba(255, 255, 255, 0.1);
  border-color: rgba(255, 255, 255, 0.3);
}

.chat-input-area {
  padding: var(--spacing-md);
  background: rgba(255, 255, 255, 0.05);
  border-top: 1px solid rgba(255, 255, 255, 0.1);
  display: flex;
  gap: var(--spacing-sm);
}

#chat-input {
  flex: 1;
  background: rgba(0, 0, 0, 0.3);
  border: 1px solid rgba(255, 255, 255, 0.2);
  color: var(--color-text-primary);
  padding: var(--spacing-sm) var(--spacing-md);
  border-radius: var(--radius-md);
  font-size: var(--font-size-small);
}

#chat-input:focus {
  outline: none;
  border-color: rgba(99, 102, 241, 0.5);
}

#chat-send {
  background: linear-gradient(135deg, #6366f1, #8b5cf6);
  border: none;
  color: #fff;
  padding: var(--spacing-sm) var(--spacing-md);
  border-radius: var(--radius-md);
  font-size: var(--font-size-small);
  font-weight: var(--font-weight-semibold);
  cursor: pointer;
  transition: all var(--transition-fast);
}

#chat-send:hover {
  transform: scale(1.05);
}

/* =====================================================
   READING MODE CUSTOM SCROLLBAR
   ===================================================== */
.reading-mode-scrollbar {
  position: absolute;
  right: 40px;
  top: 15%;
  height: 70%;
  width: 64px;
  z-index: 110;
  pointer-events: none;
}

.reading-mode-scrollbar .custom-scrollbar-track {
  position: relative;
  width: 100%;
  height: 100%;
  background: rgba(255, 255, 255, 0.1);
  border-radius: 32px;
  border: 1px solid rgba(255, 255, 255, 0.15);
  padding: 6px;
}

.reading-mode-scrollbar .custom-scrollbar-thumb {
  position: absolute;
  left: 6px;
  right: 6px;
  width: calc(100% - 12px);
  background: linear-gradient(180deg, rgba(255, 255, 255, 0.7), rgba(255, 255, 255, 0.9));
  border-radius: 26px;
  cursor: pointer;
  pointer-events: all;
  transition: background 0.3s ease, box-shadow 0.3s ease;
  box-shadow: 0 4px 12px rgba(0, 0, 0, 0.3);
  border: 2px solid rgba(255, 255, 255, 0.3);
}

.reading-mode-scrollbar .custom-scrollbar-thumb:hover {
  background: linear-gradient(180deg, rgba(255, 255, 255, 0.85), rgba(255, 255, 255, 1));
  box-shadow: 0 6px 20px rgba(0, 0, 0, 0.4);
}

.reading-mode-scrollbar .custom-scrollbar-thumb:active {
  background: rgba(255, 255, 255, 1);
  box-shadow: 0 8px 25px rgba(0, 0, 0, 0.5);
}

/* =====================================================
   RESPONSIVE ADJUSTMENTS
   ===================================================== */
@media (max-width: 767px) {
  .chat-window {
    width: calc(100vw - 32px);
    right: 16px;
  }

  .reading-mode-content {
    padding: 60px 20px 20vh 20px;
  }

  .reading-mode-header {
    padding: 16px 20px;
  }

  .reading-paragraph.in-focus {
    font-size: 1.25rem;
  }

  .reading-paragraph.near-focus {
    font-size: 1.125rem;
  }
}