/* Enhanced Course Preview Styles */

/* Chapter Accordion Enhancements */
.chapter-accordion {
  transition: all 0.3s cubic-bezier(0.4, 0, 0.2, 1);
  position: relative;
  overflow: hidden;
}

.chapter-accordion:hover {
  transform: translateY(-2px);
  box-shadow: 0 10px 25px -5px rgba(0, 0, 0, 0.1), 0 10px 10px -5px rgba(0, 0, 0, 0.04);
}

.chapter-accordion::before {
  content: '';
  position: absolute;
  top: 0;
  left: 0;
  right: 0;
  height: 3px;
  background: linear-gradient(90deg, var(--primary-color), var(--primary-hover));
  opacity: 0;
  transition: opacity 0.3s ease;
}

.chapter-accordion:hover::before {
  opacity: 1;
}

/* Chapter Header Styles */
.chapter-header {
  position: relative;
  transition: all 0.3s cubic-bezier(0.4, 0, 0.2, 1);
  border-radius: 12px 12px 0 0;
}

.chapter-header:hover {
  background: linear-gradient(135deg, var(--bg-secondary), var(--bg-tertiary));
}

.chapter-header.active {
  background: linear-gradient(135deg, var(--bg-accent), rgba(2, 193, 216, 0.1));
  border-bottom: 2px solid var(--primary-color);
}

.chapter-header:focus {
  outline: 2px solid var(--primary-color);
  outline-offset: 2px;
}

/* Chapter Chevron Animation */
.chapter-chevron {
  transition: all 0.3s cubic-bezier(0.4, 0, 0.2, 1);
}

.chapter-header.active .chapter-chevron {
  transform: rotate(180deg);
  color: var(--primary-color);
}

/* Chapter Content Styles */
.chapter-content {
  transition: max-height 0.5s cubic-bezier(0.4, 0, 0.2, 1);
  background: var(--bg-primary);
  border-radius: 0 0 12px 12px;
}

/* Lesson Item Enhancements */
.lesson-item {
  transition: all 0.2s cubic-bezier(0.4, 0, 0.2, 1);
  position: relative;
}

.lesson-item:hover {
  background: linear-gradient(135deg, var(--bg-secondary), var(--bg-tertiary));
  transform: translateX(4px);
}

.lesson-item::before {
  content: '';
  position: absolute;
  left: 0;
  top: 0;
  bottom: 0;
  width: 3px;
  background: var(--primary-color);
  opacity: 0;
  transition: opacity 0.3s ease;
}

.lesson-item:hover::before {
  opacity: 1;
}

/* Enhanced Watermark System for Content Protection */
.watermark-system {
  position: fixed;
  top: 0;
  left: 0;
  width: 100%;
  height: 100%;
  pointer-events: none;
  z-index: 9999;
  overflow: hidden;
}

/* Diagonal watermark pattern */
.watermark-layer {
  position: absolute;
  top: 0;
  left: 0;
  width: 200%;
  height: 200%;
  transform: rotate(-45deg);
  opacity: 0.03;
  pointer-events: none;
  user-select: none;
}

.watermark-diagonal {
  display: flex;
  flex-direction: column;
  justify-content: space-around;
  align-items: center;
}

.watermark-text {
  font-family: 'Courier New', monospace;
  font-size: 14px;
  font-weight: 600;
  color: var(--text-primary);
  white-space: nowrap;
  margin: 20px 0;
  letter-spacing: 2px;
  text-transform: uppercase;
}

/* Floating watermarks */
.watermark-floating {
  position: fixed;
  font-family: 'Courier New', monospace;
  font-size: 12px;
  font-weight: 500;
  color: var(--text-muted);
  opacity: 0.4;
  pointer-events: none;
  user-select: none;
  z-index: 9998;
  transform: rotate(-15deg);
  letter-spacing: 1px;
}

.watermark-top-left {
  top: 80px;
  left: 20px;
}

.watermark-top-right {
  top: 80px;
  right: 20px;
  transform: rotate(15deg);
}

.watermark-bottom-left {
  bottom: 20px;
  left: 20px;
  transform: rotate(15deg);
}

.watermark-bottom-right {
  bottom: 20px;
  right: 20px;
  transform: rotate(-15deg);
}

.watermark-center {
  top: 50%;
  left: 50%;
  transform: translate(-50%, -50%) rotate(-30deg);
  font-size: 16px;
  opacity: 0.2;
}

/* Dynamic moving watermarks */
.watermark-dynamic {
  position: fixed;
  font-family: 'Courier New', monospace;
  font-size: 11px;
  font-weight: 400;
  color: var(--text-muted);
  opacity: 0.3;
  pointer-events: none;
  user-select: none;
  z-index: 9997;
  transition: transform 3s ease-in-out;
  transform: rotate(-20deg);
  letter-spacing: 1px;
}

/* Dark mode watermark adjustments */
.dark .watermark-text,
.dark .watermark-floating,
.dark .watermark-dynamic {
  color: var(--text-secondary);
}

.dark .watermark-layer {
  opacity: 0.05;
}

/* Sticky Sidebar Enhancements */
.sticky-sidebar {
  transition: all 0.3s ease;
}

.sticky-chapter-nav {
  position: sticky;
  top: 120px;
  z-index: 100;
  max-height: calc(100vh - 140px);
  overflow-y: auto;
}

/* Enhanced sticky behavior for mobile */
@media (max-width: 1024px) {
  .sticky-chapter-nav {
    position: relative;
    top: auto;
    max-height: none;
  }
}

/* Custom scrollbar for chapter navigation */
.custom-scrollbar::-webkit-scrollbar {
  width: 6px;
}

.custom-scrollbar::-webkit-scrollbar-track {
  background: var(--bg-secondary);
  border-radius: 3px;
}

.custom-scrollbar::-webkit-scrollbar-thumb {
  background: var(--primary-color);
  border-radius: 3px;
  opacity: 0.7;
}

.custom-scrollbar::-webkit-scrollbar-thumb:hover {
  background: var(--primary-hover);
  opacity: 1;
}

/* Enhanced lesson navigation items */
.lesson-nav-item {
  transition: all 0.2s ease;
  border-radius: 8px;
  overflow: hidden;
}

.lesson-nav-item.active {
  background: linear-gradient(135deg, var(--primary-color), var(--primary-hover));
  box-shadow: 0 4px 12px rgba(2, 193, 216, 0.3);
}

.lesson-nav-item:not(.active):hover {
  background: var(--bg-secondary);
  transform: translateX(2px);
}

.lesson-nav-item.locked {
  opacity: 0.5;
  cursor: not-allowed;
}

/* Progress tracking enhancements */
.btn-primary.loading {
  background: linear-gradient(135deg, #6b7280, #4b5563);
  cursor: not-allowed;
  position: relative;
}

.btn-primary.loading::after {
  content: '';
  position: absolute;
  top: 50%;
  left: 50%;
  width: 16px;
  height: 16px;
  margin: -8px 0 0 -8px;
  border: 2px solid transparent;
  border-top-color: white;
  border-radius: 50%;
  animation: spin 1s linear infinite;
}

.btn-primary.success {
  background: linear-gradient(135deg, var(--success-color), #059669);
  animation: pulse 0.5s ease-in-out;
}

.btn-primary.error {
  background: linear-gradient(135deg, var(--error-color), #dc2626);
  animation: shake 0.5s ease-in-out;
}

/* Lesson completion checkbox enhancements */
#lessonCompleteSwitch {
  transform: scale(1.2);
  transition: all 0.3s ease;
}

#lessonCompleteSwitch:checked {
  background-color: var(--primary-color);
  border-color: var(--primary-color);
}

#lessonCompleteSwitch:focus {
  box-shadow: 0 0 0 3px rgba(2, 193, 216, 0.3);
}

.completed {
  background: linear-gradient(135deg, rgba(16, 185, 129, 0.1), rgba(5, 150, 105, 0.1));
  border: 1px solid rgba(16, 185, 129, 0.3);
}

/* Content protection styles */
.blog-content {
  -webkit-user-select: none;
  -moz-user-select: none;
  -ms-user-select: none;
  user-select: none;
  -webkit-touch-callout: none;
  -webkit-tap-highlight-color: transparent;
}

/* Allow selection for input fields and buttons */
input, button, textarea, select {
  -webkit-user-select: auto;
  -moz-user-select: auto;
  -ms-user-select: auto;
  user-select: auto;
}

/* Prevent image dragging */
img {
  -webkit-user-drag: none;
  -khtml-user-drag: none;
  -moz-user-drag: none;
  -o-user-drag: none;
  user-drag: none;
  pointer-events: none;
}

/* Allow interaction with interactive elements */
a, button, input, textarea, select {
  pointer-events: auto;
}

/* Enhanced animations */
@keyframes spin {
  to {
    transform: rotate(360deg);
  }
}

@keyframes pulse {
  0%, 100% {
    transform: scale(1);
  }
  50% {
    transform: scale(1.05);
  }
}

@keyframes shake {
  0%, 100% {
    transform: translateX(0);
  }
  25% {
    transform: translateX(-5px);
  }
  75% {
    transform: translateX(5px);
  }
}

@keyframes fadeInUp {
  from {
    opacity: 0;
    transform: translateY(20px);
  }
  to {
    opacity: 1;
    transform: translateY(0);
  }
}

@keyframes slideInLeft {
  from {
    opacity: 0;
    transform: translateX(-20px);
  }
  to {
    opacity: 1;
    transform: translateX(0);
  }
}

@keyframes shimmer {
  0% {
    left: -100%;
  }
  100% {
    left: 100%;
  }
}

/* Lesson Status Indicators */
.lesson-status-completed {
  background: linear-gradient(135deg, var(--success-color), #059669);
  color: white;
  box-shadow: 0 2px 4px rgba(16, 185, 129, 0.3);
}

.lesson-status-pending {
  background: var(--bg-tertiary);
  border: 2px solid var(--border-color);
  transition: all 0.3s ease;
}

.lesson-status-pending:hover {
  border-color: var(--primary-color);
  background: rgba(2, 193, 216, 0.1);
}

.lesson-status-locked {
  background: var(--bg-secondary);
  border: 2px solid var(--border-color);
  opacity: 0.6;
}

/* Lesson Type Icons */
.lesson-type-video {
  background: linear-gradient(135deg, #ef4444, #dc2626);
  color: white;
  box-shadow: 0 2px 4px rgba(239, 68, 68, 0.3);
}

.lesson-type-exercise {
  background: linear-gradient(135deg, var(--info-color), #2563eb);
  color: white;
  box-shadow: 0 2px 4px rgba(59, 130, 246, 0.3);
}

.lesson-type-reading {
  background: linear-gradient(135deg, var(--warning-color), #d97706);
  color: white;
  box-shadow: 0 2px 4px rgba(245, 158, 11, 0.3);
}

/* Progress Bar Enhancements */
.chapter-progress {
  background: var(--bg-tertiary);
  border-radius: 9999px;
  overflow: hidden;
  box-shadow: inset 0 1px 3px rgba(0, 0, 0, 0.1);
}

.chapter-progress-fill {
  background: linear-gradient(90deg, var(--primary-color), var(--primary-hover));
  transition: width 0.5s cubic-bezier(0.4, 0, 0.2, 1);
  position: relative;
  overflow: hidden;
}

.chapter-progress-fill::after {
  content: '';
  position: absolute;
  top: 0;
  left: -100%;
  width: 100%;
  height: 100%;
  background: linear-gradient(90deg, transparent, rgba(255, 255, 255, 0.3), transparent);
  animation: shimmer 2s infinite;
}

/* Control Buttons */
.chapter-controls {
  display: flex;
  gap: 0.5rem;
  align-items: center;
}

.control-btn {
  display: inline-flex;
  align-items: center;
  gap: 0.5rem;
  padding: 0.5rem 1rem;
  border-radius: 8px;
  font-size: 0.875rem;
  font-weight: 500;
  transition: all 0.3s cubic-bezier(0.4, 0, 0.2, 1);
  cursor: pointer;
  border: 1px solid var(--border-color);
  background: var(--bg-primary);
  color: var(--text-secondary);
}

.control-btn:hover {
  background: var(--bg-secondary);
  border-color: var(--primary-color);
  color: var(--primary-color);
  transform: translateY(-1px);
  box-shadow: var(--shadow-sm);
}

.control-btn:active {
  transform: translateY(0);
}

.control-btn svg {
  transition: transform 0.3s ease;
}

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

/* Staggered Animation for Lessons */
.lesson-item:nth-child(1) { animation-delay: 0.1s; }
.lesson-item:nth-child(2) { animation-delay: 0.2s; }
.lesson-item:nth-child(3) { animation-delay: 0.3s; }
.lesson-item:nth-child(4) { animation-delay: 0.4s; }
.lesson-item:nth-child(5) { animation-delay: 0.5s; }

.chapter-content.expanding .lesson-item {
  animation: slideInLeft 0.4s cubic-bezier(0.4, 0, 0.2, 1) forwards;
  opacity: 0;
}

/* Enhanced Focus States */
.lesson-item a:focus {
  outline: 2px solid var(--primary-color);
  outline-offset: 2px;
  border-radius: 8px;
}

/* Improved Accessibility */
.chapter-header[aria-expanded="true"] .chapter-chevron {
  transform: rotate(180deg);
}

.chapter-content[aria-hidden="true"] {
  max-height: 0;
  overflow: hidden;
}

.chapter-content[aria-hidden="false"] {
  max-height: none;
  overflow: visible;
}

/* Loading States */
.chapter-loading {
  position: relative;
  pointer-events: none;
}

.chapter-loading::after {
  content: '';
  position: absolute;
  top: 50%;
  left: 50%;
  width: 20px;
  height: 20px;
  margin: -10px 0 0 -10px;
  border: 2px solid var(--border-color);
  border-top-color: var(--primary-color);
  border-radius: 50%;
  animation: spin 1s linear infinite;
}

/* Enhanced Dark Mode Support */
.dark .chapter-accordion {
  background: var(--bg-secondary);
  border-color: var(--border-color);
}

.dark .chapter-header:hover {
  background: linear-gradient(135deg, var(--bg-tertiary), rgba(51, 65, 85, 0.8));
}

.dark .chapter-header.active {
  background: linear-gradient(135deg, var(--bg-accent), rgba(2, 193, 216, 0.15));
}

.dark .lesson-item:hover {
  background: linear-gradient(135deg, var(--bg-tertiary), rgba(51, 65, 85, 0.6));
}

/* Responsive Enhancements */
@media (max-width: 768px) {
  .chapter-header {
    padding: 1rem;
  }
  
  .chapter-controls {
    flex-direction: column;
    gap: 0.25rem;
  }
  
  .control-btn {
    padding: 0.375rem 0.75rem;
    font-size: 0.8rem;
  }
  
  .lesson-item {
    padding: 0.75rem;
  }
  
  .chapter-accordion:hover {
    transform: none;
  }
  
  .lesson-item:hover {
    transform: none;
  }

  .watermark-floating {
    font-size: 10px;
  }

  .watermark-text {
    font-size: 12px;
  }

  .sticky-chapter-nav {
    position: relative;
    top: auto;
    max-height: 400px;
  }
}

@media (max-width: 640px) {
  .chapter-header .flex {
    flex-direction: column;
    align-items: flex-start;
    gap: 1rem;
  }
  
  .chapter-progress {
    width: 100%;
    margin-top: 0.5rem;
  }

  .watermark-floating {
    display: none;
  }

  .watermark-dynamic {
    font-size: 9px;
  }
}

/* Print Styles */
@media print {
  .chapter-controls {
    display: none;
  }
  
  .chapter-content {
    max-height: none !important;
    overflow: visible !important;
  }
  
  .chapter-chevron {
    display: none;
  }

  .watermark-system {
    display: block !important;
    opacity: 0.8 !important;
  }

  .watermark-floating,
  .watermark-dynamic {
    display: block !important;
    opacity: 0.6 !important;
  }
}

/* High Contrast Mode Support */
@media (prefers-contrast: high) {
  .chapter-accordion {
    border: 2px solid var(--text-primary);
  }
  
  .chapter-header.active {
    background: var(--primary-color);
    color: var(--text-inverse);
  }
  
  .lesson-item:hover {
    background: var(--primary-color);
    color: var(--text-inverse);
  }

  .watermark-text,
  .watermark-floating,
  .watermark-dynamic {
    opacity: 0.8;
  }
}

/* Reduced Motion Support */
@media (prefers-reduced-motion: reduce) {
  .chapter-accordion,
  .chapter-header,
  .chapter-chevron,
  .chapter-content,
  .lesson-item,
  .watermark-dynamic {
    transition: none;
  }
  
  .chapter-content.expanding .lesson-item {
    animation: none;
    opacity: 1;
  }
  
  .chapter-progress-fill::after {
    animation: none;
  }

  .watermark-dynamic {
    transform: rotate(-20deg) !important;
  }
}

/* Enhanced Tooltips */
.tooltip {
  position: relative;
  display: inline-block;
}

.tooltip .tooltip-text {
  visibility: hidden;
  width: 120px;
  background-color: var(--bg-primary);
  color: var(--text-primary);
  text-align: center;
  border-radius: 6px;
  padding: 5px;
  position: absolute;
  z-index: 1;
  bottom: 125%;
  left: 50%;
  margin-left: -60px;
  opacity: 0;
  transition: opacity 0.3s;
  border: 1px solid var(--border-color);
  box-shadow: var(--shadow-md);
  font-size: 0.75rem;
}

.tooltip .tooltip-text::after {
  content: "";
  position: absolute;
  top: 100%;
  left: 50%;
  margin-left: -5px;
  border-width: 5px;
  border-style: solid;
  border-color: var(--border-color) transparent transparent transparent;
}

.tooltip:hover .tooltip-text {
  visibility: visible;
  opacity: 1;
}

/* Enhanced Badge Styles for Lessons */
.lesson-badge {
  display: inline-flex;
  align-items: center;
  padding: 0.125rem 0.5rem;
  border-radius: 9999px;
  font-size: 0.75rem;
  font-weight: 500;
  text-transform: uppercase;
  letter-spacing: 0.025em;
}

.lesson-badge-new {
  background: linear-gradient(135deg, var(--success-color), #059669);
  color: white;
  box-shadow: 0 1px 3px rgba(16, 185, 129, 0.3);
}

.lesson-badge-updated {
  background: linear-gradient(135deg, var(--info-color), #2563eb);
  color: white;
  box-shadow: 0 1px 3px rgba(59, 130, 246, 0.3);
}

.lesson-badge-premium {
  background: linear-gradient(135deg, #8b5cf6, #7c3aed);
  color: white;
  box-shadow: 0 1px 3px rgba(139, 92, 246, 0.3);
}

/* Enhanced Chapter Statistics */
.chapter-stats {
  display: flex;
  align-items: center;
  gap: 1rem;
  margin-top: 0.5rem;
  padding: 0.75rem;
  background: var(--bg-secondary);
  border-radius: 8px;
  border: 1px solid var(--border-color);
}

.chapter-stat {
  display: flex;
  align-items: center;
  gap: 0.25rem;
  font-size: 0.875rem;
  color: var(--text-secondary);
}

.chapter-stat svg {
  width: 1rem;
  height: 1rem;
  color: var(--primary-color);
}

/* Micro-interactions */
.lesson-item a {
  position: relative;
  overflow: hidden;
}

.lesson-item a::before {
  content: '';
  position: absolute;
  top: 0;
  left: -100%;
  width: 100%;
  height: 100%;
  background: linear-gradient(90deg, transparent, rgba(2, 193, 216, 0.1), transparent);
  transition: left 0.5s ease;
}

.lesson-item a:hover::before {
  left: 100%;
}

/* Enhanced Empty States */
.empty-state {
  text-align: center;
  padding: 3rem 1rem;
  color: var(--text-muted);
}

.empty-state svg {
  width: 4rem;
  height: 4rem;
  margin: 0 auto 1rem;
  opacity: 0.5;
}

.empty-state h3 {
  font-size: 1.125rem;
  font-weight: 600;
  margin-bottom: 0.5rem;
  color: var(--text-primary);
}

.empty-state p {
  font-size: 0.875rem;
  line-height: 1.5;
}