/**
 * SinBar Academy - Material & Lesson Reader Styles
 * Editorial Typography, Video Player Card, Code Blocks, Callouts, & Sticky Curriculum Sidebar.
 */

.reader-layout {
  display: flex;
  min-height: calc(100vh - 4.5rem);
  position: relative;
}

/* --- Sticky Curriculum Sidebar --- */
.reader-sidebar {
  width: 320px;
  flex-shrink: 0;
  background: var(--bg-surface);
  border-right: 1px solid var(--border-subtle);
  height: calc(100vh - 4.5rem);
  position: sticky;
  top: 4.5rem;
  overflow-y: auto;
  padding: 1.5rem 1.25rem;
  display: flex;
  flex-direction: column;
}

.sidebar-header {
  padding-bottom: 1.25rem;
  border-bottom: 1px solid var(--border-subtle);
  margin-bottom: 1.25rem;
}

.course-badge {
  display: inline-block;
  font-size: 0.72rem;
  font-weight: 700;
  text-transform: uppercase;
  letter-spacing: 0.05em;
  color: var(--accent-primary);
  margin-bottom: 0.4rem;
}

.sidebar-course-title {
  font-size: 1.05rem;
  font-weight: 700;
  line-height: 1.35;
  margin-bottom: 1rem;
}

.course-progress-box {
  background: var(--bg-card);
  border: 1px solid var(--border-glass);
  border-radius: var(--radius-sm);
  padding: 0.85rem;
}

.progress-info {
  display: flex;
  justify-content: space-between;
  font-size: 0.78rem;
  font-weight: 600;
  color: var(--text-secondary);
  margin-bottom: 0.4rem;
}

.progress-val {
  color: var(--accent-primary);
}

.curriculum-tree {
  display: flex;
  flex-direction: column;
  gap: 1.25rem;
}

.module-title-bar {
  display: flex;
  align-items: center;
  gap: 0.6rem;
  margin-bottom: 0.6rem;
}

.mod-number {
  font-family: var(--font-mono);
  font-size: 0.75rem;
  font-weight: 700;
  color: var(--accent-primary);
}

.mod-heading {
  font-size: 0.85rem;
  font-weight: 700;
  color: var(--text-muted);
  text-transform: uppercase;
  letter-spacing: 0.04em;
}

.module-lesson-list {
  display: flex;
  flex-direction: column;
  gap: 0.35rem;
}

.curriculum-lesson-item {
  display: flex;
  align-items: center;
  gap: 0.75rem;
  padding: 0.65rem 0.85rem;
  border-radius: var(--radius-sm);
  background: transparent;
  transition: all var(--transition-fast);
  color: var(--text-secondary);
}

.curriculum-lesson-item:hover {
  background: var(--bg-card-hover);
  color: var(--text-primary);
}

.curriculum-lesson-item.lesson-active {
  background: linear-gradient(135deg, rgba(99, 102, 241, 0.18), rgba(139, 92, 246, 0.1));
  border: 1px solid rgba(99, 102, 241, 0.35);
  color: var(--text-primary);
}

.lesson-check-icon i {
  width: 1.05rem;
  height: 1.05rem;
  flex-shrink: 0;
}

.curriculum-lesson-item.lesson-done .lesson-check-icon {
  color: var(--color-success);
}

.curriculum-lesson-item.lesson-active .lesson-check-icon {
  color: var(--accent-primary);
}

.lesson-link-text {
  display: flex;
  flex-direction: column;
  gap: 0.15rem;
}

.item-title {
  font-size: 0.85rem;
  font-weight: 600;
  line-height: 1.3;
}

.item-meta {
  font-size: 0.72rem;
  color: var(--text-muted);
}

/* --- Main Reader Content Area --- */
.reader-main {
  flex: 1;
  max-width: 860px;
  margin: 0 auto;
  padding: 2.5rem 2rem 6rem;
  overflow-x: hidden;
}

/* Top Action Bar */
.reader-top-actions {
  display: flex;
  align-items: center;
  justify-content: space-between;
  margin-bottom: 2rem;
  padding-bottom: 1rem;
  border-bottom: 1px solid var(--border-subtle);
  gap: 1rem;
  flex-wrap: wrap;
}

.reader-breadcrumbs {
  display: flex;
  align-items: center;
  gap: 0.45rem;
  font-size: 0.82rem;
  color: var(--text-muted);
}

.reader-breadcrumbs a:hover {
  color: var(--accent-primary);
}

.crumb-current {
  color: var(--text-primary);
  font-weight: 600;
  white-space: nowrap;
  overflow: hidden;
  text-overflow: ellipsis;
  max-width: 250px;
}

.reader-actions-right {
  display: flex;
  align-items: center;
  gap: 0.6rem;
}

/* Lesson Header */
.lesson-header {
  margin-bottom: 2.5rem;
}

.lesson-meta-chips {
  display: flex;
  align-items: center;
  gap: 0.6rem;
  flex-wrap: wrap;
  margin-bottom: 1.25rem;
}

.chip-type, .chip-duration, .chip-status {
  display: inline-flex;
  align-items: center;
  gap: 0.35rem;
  font-size: 0.75rem;
  font-weight: 600;
  padding: 0.3rem 0.75rem;
  border-radius: var(--radius-full);
}

.chip-type i, .chip-duration i, .chip-status i {
  width: 0.9rem;
  height: 0.9rem;
}

.chip-video {
  background: var(--color-info-bg);
  color: var(--color-info);
  border: 1px solid rgba(56, 189, 248, 0.3);
}

.chip-article {
  background: var(--color-success-bg);
  color: var(--color-success);
  border: 1px solid rgba(16, 185, 129, 0.3);
}

.chip-quiz {
  background: rgba(99, 102, 241, 0.12);
  color: #a5b4fc;
  border: 1px solid rgba(99, 102, 241, 0.35);
}

.lesson-quiz-start-panel {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 1.25rem;
  flex-wrap: wrap;
  margin: 1.5rem 0 0.5rem;
  padding: 1.35rem 1.4rem;
  border-radius: 14px;
  border: 1px solid rgba(99, 102, 241, 0.35);
  background: linear-gradient(135deg, rgba(99, 102, 241, 0.14), rgba(16, 185, 129, 0.06));
}

.quiz-start-copy {
  flex: 1 1 240px;
  min-width: 0;
}

.quiz-start-copy h3 {
  margin: 0.45rem 0 0.4rem;
  font-size: 1.15rem;
  color: var(--text-primary);
}

.quiz-start-copy p {
  margin: 0;
  color: var(--text-secondary);
  line-height: 1.5;
  font-size: 0.92rem;
}

.btn-quiz-start {
  flex-shrink: 0;
}

.chip-duration {
  background: var(--bg-card);
  color: var(--text-secondary);
  border: 1px solid var(--border-glass);
}

.chip-status {
  background: var(--bg-card);
  color: var(--text-muted);
  border: 1px solid var(--border-glass);
}

.chip-status.status-completed {
  background: var(--color-success-bg);
  color: var(--color-success);
  border-color: rgba(16, 185, 129, 0.4);
}

.lesson-main-title {
  font-size: clamp(2rem, 3.8vw, 2.75rem);
  font-weight: 800;
  letter-spacing: -0.035em;
  line-height: 1.2;
  margin-bottom: 1rem;
}

.lesson-summary-lead {
  font-size: 1.15rem;
  color: var(--text-secondary);
  line-height: 1.7;
}

/* --- Video Player Container --- */
.video-player-container {
  margin-bottom: 3rem;
  border-radius: var(--radius-lg);
  overflow: hidden;
  background: var(--bg-surface);
  border: 1px solid var(--border-glass);
  box-shadow: var(--shadow-md);
}

.video-frame-wrapper {
  position: relative;
  width: 100%;
  padding-top: 56.25%; /* 16:9 Aspect Ratio */
}

.video-frame-wrapper iframe {
  position: absolute;
  top: 0;
  left: 0;
  width: 100%;
  height: 100%;
  border: none;
}

.video-timestamps-bar {
  padding: 1.25rem 1.5rem;
  background: var(--bg-surface-elevated);
  border-top: 1px solid var(--border-subtle);
}

.timestamps-header {
  display: flex;
  align-items: center;
  gap: 0.45rem;
  font-size: 0.82rem;
  font-weight: 700;
  color: var(--text-muted);
  text-transform: uppercase;
  letter-spacing: 0.05em;
  margin-bottom: 0.85rem;
}

.timestamps-header i {
  width: 1rem;
  height: 1rem;
}

.timestamps-list {
  display: flex;
  flex-wrap: wrap;
  gap: 0.5rem;
}

.btn-timestamp {
  display: inline-flex;
  align-items: center;
  gap: 0.4rem;
  padding: 0.4rem 0.85rem;
  background: var(--bg-card);
  border: 1px solid var(--border-glass);
  border-radius: var(--radius-full);
  font-size: 0.8rem;
  color: var(--text-secondary);
  cursor: pointer;
  transition: all var(--transition-fast);
}

.btn-timestamp strong {
  color: var(--accent-primary);
  font-family: var(--font-mono);
}

.btn-timestamp i {
  width: 0.85rem;
  height: 0.85rem;
}

.btn-timestamp:hover {
  background: var(--bg-card-hover);
  color: var(--text-primary);
  border-color: var(--border-focus);
  transform: translateY(-1px);
}

/* --- Editorial Rich Text Body --- */
.lesson-body-content {
  font-size: 1.08rem;
  line-height: 1.8;
  color: var(--text-secondary);
}

.lesson-body-content h2 {
  font-size: 1.7rem;
  color: var(--text-primary);
  margin: 2.5rem 0 1rem;
  letter-spacing: -0.025em;
}

.lesson-body-content h3 {
  font-size: 1.35rem;
  color: var(--text-primary);
  margin: 2rem 0 0.85rem;
}

.lesson-body-content p {
  margin-bottom: 1.4rem;
}

.lesson-body-content strong {
  color: var(--text-primary);
  font-weight: 600;
}

.lesson-body-content code:not(pre code) {
  font-family: var(--font-mono);
  font-size: 0.9em;
  padding: 0.15em 0.4em;
  border-radius: var(--radius-xs);
  background: rgba(99, 102, 241, 0.12);
  color: var(--accent-primary);
  border: 1px solid rgba(99, 102, 241, 0.25);
}

/* Callout Boxes */
.callout {
  display: flex;
  gap: 1.15rem;
  padding: 1.25rem 1.5rem;
  border-radius: var(--radius-md);
  margin: 2rem 0;
  backdrop-filter: blur(12px);
}

.callout-icon {
  font-size: 1.4rem;
  line-height: 1;
}

.callout-body {
  font-size: 0.98rem;
  line-height: 1.65;
}

.callout-tip {
  background: rgba(99, 102, 241, 0.1);
  border: 1px solid rgba(99, 102, 241, 0.3);
  color: var(--text-primary);
}

.callout-warning {
  background: var(--color-warning-bg);
  border: 1px solid rgba(245, 158, 11, 0.35);
  color: var(--text-primary);
}

.callout-info {
  background: var(--color-info-bg);
  border: 1px solid rgba(56, 189, 248, 0.3);
  color: var(--text-primary);
}

/* Code Snippet Box */
.code-snippet-box {
  border-radius: var(--radius-md);
  background: #060910;
  border: 1px solid var(--border-glass);
  margin: 2rem 0;
  overflow: hidden;
  box-shadow: var(--shadow-md);
}

.code-header {
  display: flex;
  align-items: center;
  justify-content: space-between;
  padding: 0.65rem 1.25rem;
  background: rgba(255, 255, 255, 0.04);
  border-bottom: 1px solid var(--border-subtle);
  font-family: var(--font-mono);
  font-size: 0.8rem;
  color: var(--text-muted);
}

.btn-copy-code {
  font-size: 0.75rem;
  padding: 0.25rem 0.65rem;
  background: var(--bg-card);
  border: 1px solid var(--border-glass);
  border-radius: var(--radius-xs);
  color: var(--text-secondary);
  cursor: pointer;
  transition: all var(--transition-fast);
}

.btn-copy-code:hover {
  color: var(--text-primary);
  border-color: var(--border-focus);
}

.btn-copy-code.copied {
  background: var(--color-success-bg);
  color: var(--color-success);
  border-color: rgba(16, 185, 129, 0.4);
}

.code-snippet-box pre {
  padding: 1.25rem;
  overflow-x: auto;
  font-family: var(--font-mono);
  font-size: 0.9rem;
  line-height: 1.6;
  color: #e2e8f0;
}

/* Image Previews */
.lesson-image-card {
  margin: 2.5rem 0;
  border-radius: var(--radius-md);
  overflow: hidden;
  border: 1px solid var(--border-glass);
  background: var(--bg-surface);
}

.img-preview {
  width: 100%;
  height: auto;
}

.img-caption {
  display: block;
  padding: 0.75rem 1rem;
  font-size: 0.82rem;
  color: var(--text-muted);
  background: var(--bg-surface-elevated);
  border-top: 1px solid var(--border-subtle);
  font-style: italic;
}

/* Key Takeaways Card */
.key-takeaways {
  background: linear-gradient(135deg, rgba(99, 102, 241, 0.08), rgba(139, 92, 246, 0.04));
  border: 1px solid rgba(99, 102, 241, 0.25);
  border-radius: var(--radius-md);
  padding: 1.5rem 1.75rem;
  margin: 2.5rem 0;
}

.key-takeaways h4 {
  font-size: 1.1rem;
  font-weight: 700;
  margin-bottom: 0.85rem;
  color: var(--text-primary);
}

.key-takeaways ul {
  padding-left: 1.25rem;
  display: flex;
  flex-direction: column;
  gap: 0.5rem;
}

.key-takeaways li {
  font-size: 0.95rem;
  color: var(--text-secondary);
}

/* --- Lesson Footer Actions --- */
.lesson-footer {
  margin-top: 4rem;
  padding-top: 2rem;
  border-top: 1px solid var(--border-subtle);
  display: flex;
  flex-direction: column;
  gap: 2rem;
}

.lesson-completion-card {
  display: flex;
  align-items: center;
  justify-content: space-between;
  padding: 1.5rem 1.75rem;
  background: var(--bg-card);
  border: 1px solid var(--border-glass);
  border-radius: var(--radius-lg);
  gap: 1.5rem;
  flex-wrap: wrap;
}

.completion-text h3 {
  font-size: 1.15rem;
  font-weight: 700;
  margin-bottom: 0.25rem;
}

.completion-text p {
  font-size: 0.88rem;
  color: var(--text-secondary);
}

/* Quiz CTA Box */
.lesson-quiz-cta-box {
  display: flex;
  align-items: center;
  justify-content: space-between;
  padding: 1.75rem 2rem;
  background: linear-gradient(135deg, rgba(99, 102, 241, 0.15), rgba(139, 92, 246, 0.1));
  border: 1px solid rgba(99, 102, 241, 0.4);
  border-radius: var(--radius-lg);
  gap: 1.5rem;
  flex-wrap: wrap;
}

.quiz-badge-tag {
  display: inline-flex;
  align-items: center;
  gap: 0.35rem;
  font-size: 0.75rem;
  font-weight: 700;
  text-transform: uppercase;
  letter-spacing: 0.05em;
  color: var(--accent-primary);
  margin-bottom: 0.3rem;
}

.quiz-cta-content h3 {
  font-size: 1.25rem;
  font-weight: 700;
  margin-bottom: 0.35rem;
}

.quiz-cta-content p {
  font-size: 0.9rem;
  color: var(--text-secondary);
  margin-bottom: 0.6rem;
}

.previous-score-badge {
  display: inline-flex;
  align-items: center;
  gap: 0.4rem;
  font-size: 0.82rem;
  color: var(--color-success);
}

/* Pagination Links */
.lesson-pagination {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 0.85rem;
  margin-top: 1rem;
  align-items: stretch;
}

.pagination-link {
  display: flex;
  align-items: center;
  gap: 0.75rem;
  padding: 0.9rem 1rem;
  background: var(--bg-card);
  border: 1px solid var(--border-glass);
  border-radius: var(--radius-md);
  color: var(--text-primary);
  transition: all var(--transition-fast);
  min-width: 0;
  max-width: 100%;
  overflow: hidden;
}

.pagination-link:hover {
  background: var(--bg-card-hover);
  border-color: var(--border-focus);
  transform: translateY(-2px);
}

.pagination-link > i {
  flex-shrink: 0;
  width: 1.1rem;
  height: 1.1rem;
}

.pagination-text {
  min-width: 0;
  flex: 1 1 auto;
  overflow: hidden;
}

.pagination-sub {
  font-size: 0.72rem;
  text-transform: uppercase;
  letter-spacing: 0.05em;
  color: var(--text-muted);
  display: block;
  white-space: nowrap;
  overflow: hidden;
  text-overflow: ellipsis;
}

.pagination-title {
  font-size: 0.9rem;
  font-weight: 600;
  white-space: nowrap;
  overflow: hidden;
  text-overflow: ellipsis;
  display: block;
  max-width: 100%;
}

.quiz-link {
  border-color: rgba(99, 102, 241, 0.4);
  background: linear-gradient(135deg, rgba(99, 102, 241, 0.1), rgba(139, 92, 246, 0.05));
}

@media (max-width: 640px) {
  .lesson-pagination {
    grid-template-columns: 1fr;
  }
}

/* --- Personal Notes Drawer --- */
.notes-drawer {
  position: fixed;
  top: 0;
  right: 0;
  width: 380px;
  height: 100vh;
  background: var(--bg-surface);
  border-left: 1px solid var(--border-glass);
  z-index: 10002;
  box-shadow: var(--shadow-lg);
  transform: translateX(100%);
  transition: transform var(--transition-smooth);
  display: flex;
  flex-direction: column;
}

.notes-drawer.open {
  transform: translateX(0);
}

.drawer-header {
  display: flex;
  align-items: center;
  justify-content: space-between;
  padding: 1.25rem 1.5rem;
  border-bottom: 1px solid var(--border-subtle);
}

.drawer-title {
  display: flex;
  align-items: center;
  gap: 0.5rem;
  font-size: 1.05rem;
  font-weight: 700;
}

.drawer-title i {
  width: 1.2rem;
  height: 1.2rem;
  color: var(--accent-primary);
}

.btn-close-drawer {
  cursor: pointer;
  color: var(--text-muted);
  padding: 0.3rem;
}

.btn-close-drawer:hover {
  color: var(--text-primary);
}

.drawer-body {
  padding: 1.5rem;
  flex: 1;
  display: flex;
  flex-direction: column;
  gap: 1rem;
}

.drawer-subtext {
  font-size: 0.85rem;
  color: var(--text-secondary);
}

.drawer-body textarea {
  flex: 1;
  background: var(--bg-card);
  border: 1px solid var(--border-glass);
  border-radius: var(--radius-sm);
  padding: 1rem;
  color: var(--text-primary);
  font-size: 0.95rem;
  line-height: 1.6;
  resize: none;
}

.drawer-body textarea:focus {
  border-color: var(--border-focus);
}

.notes-status-indicator {
  display: flex;
  align-items: center;
  gap: 0.35rem;
  font-size: 0.78rem;
  color: var(--text-muted);
}

.notes-status-indicator i {
  width: 0.9rem;
  height: 0.9rem;
}

.drawer-backdrop {
  position: fixed;
  inset: 0;
  background: rgba(4, 7, 14, 0.6);
  z-index: 10001;
  opacity: 0;
  visibility: hidden;
  transition: all var(--transition-smooth);
}

.drawer-backdrop.open {
  opacity: 1;
  visibility: visible;
}

/* --- Module / Bab Picker --- */
.module-picker-page {
  max-width: 1100px;
  margin: 0 auto;
  padding: 2rem 1.25rem 4rem;
}

.module-picker-hero {
  margin-bottom: 2rem;
}

.module-picker-back {
  display: inline-flex;
  align-items: center;
  gap: 0.4rem;
  font-size: 0.85rem;
  font-weight: 600;
  color: var(--text-muted);
  margin-bottom: 1rem;
}

.module-picker-back:hover {
  color: var(--accent-primary);
}

.module-picker-back i {
  width: 1rem;
  height: 1rem;
}

.module-picker-hero h1 {
  font-size: clamp(1.5rem, 3vw, 2rem);
  margin: 0.35rem 0 0.6rem;
  color: var(--text-primary);
  line-height: 1.25;
}

.module-picker-hero > p {
  color: var(--text-secondary);
  max-width: 42rem;
  line-height: 1.55;
  margin: 0;
}

.module-picker-grid {
  display: grid;
  grid-template-columns: repeat(auto-fill, minmax(260px, 1fr));
  gap: 1rem;
}

.module-pick-card {
  display: flex;
  flex-direction: column;
  gap: 0.45rem;
  padding: 1.35rem 1.25rem;
  border: 1px solid var(--border-subtle);
  border-radius: 14px;
  background: var(--bg-surface);
  text-decoration: none;
  color: inherit;
  transition: border-color 0.2s ease, transform 0.2s ease, background 0.2s ease;
}

.module-pick-card:hover {
  border-color: var(--accent-primary);
  transform: translateY(-2px);
  background: var(--bg-surface-elevated, var(--bg-surface));
}

.module-pick-num {
  font-size: 0.72rem;
  font-weight: 700;
  letter-spacing: 0.06em;
  text-transform: uppercase;
  color: var(--accent-primary);
}

.module-pick-card h2 {
  font-size: 1.05rem;
  margin: 0;
  line-height: 1.35;
  color: var(--text-primary);
}

.module-pick-card > p {
  margin: 0;
  font-size: 0.85rem;
  color: var(--text-muted);
}

.module-pick-cta {
  margin-top: auto;
  padding-top: 0.85rem;
  display: inline-flex;
  align-items: center;
  gap: 0.35rem;
  font-size: 0.85rem;
  font-weight: 600;
  color: var(--accent-primary);
}

.module-pick-cta i {
  width: 0.95rem;
  height: 0.95rem;
}

/* Responsive Reader */
@media (max-width: 1024px) {
  .reader-sidebar {
    display: none; /* Can be toggled or responsive */
  }
  .reader-main {
    padding: 1.5rem 1rem 5rem;
  }
}