/*
 * Jackrabbit – Classroom Feature Styles
 * Folders, lessons, slides, quizzes, and scoring UI.
 */

/* ============================================
   Classroom Folder Grid
   ============================================ */
.classroom-folders-grid {
  display: grid;
  grid-template-columns: repeat(auto-fill, minmax(220px, 1fr));
  gap: var(--spacing-lg);
}

.classroom-folder-card {
  background: var(--card-bg);
  border: 1px solid var(--card-border);
  border-radius: var(--radius-lg);
  padding: var(--spacing-lg);
  text-align: center;
  transition: box-shadow 0.2s, transform 0.15s;
  text-decoration: none;
  color: var(--text-color);
  display: flex;
  flex-direction: column;
  align-items: center;
  gap: var(--spacing-sm);
}

.classroom-folder-card:hover {
  box-shadow: var(--shadow-md);
  transform: translateY(-2px);
  color: var(--text-color);
}

.classroom-folder-card .folder-icon {
  font-size: 2.5rem;
}

.classroom-folder-card .folder-name {
  font-weight: 600;
  font-size: 1rem;
}

.classroom-folder-card .folder-meta {
  font-size: 0.8rem;
  color: var(--text-muted);
}

/* ============================================
   Lesson Cards
   ============================================ */
.classroom-lessons-grid {
  display: grid;
  grid-template-columns: repeat(auto-fill, minmax(300px, 1fr));
  gap: var(--spacing-md);
}

.classroom-lesson-card {
  display: flex;
  flex-direction: row;
  align-items: stretch;
  background: var(--card-bg);
  border: 1px solid var(--card-border);
  border-radius: var(--radius-lg);
  box-shadow: var(--card-shadow);
  text-decoration: none;
  color: var(--text-color);
  transition: box-shadow 0.2s ease, transform 0.15s ease;
  overflow: hidden;
}

.classroom-lesson-card:hover {
  box-shadow: var(--shadow-md);
  transform: translateY(-2px);
  color: var(--text-color);
}

.classroom-lesson-card-icon {
  display: flex;
  align-items: center;
  justify-content: center;
  width: 52px;
  flex-shrink: 0;
  border-right: 1px solid var(--card-border);
  transition: background 0.2s ease, color 0.2s ease;
}

/* ── Type indicators (staff/admin: no personal status) ── */

.classroom-lesson-card-icon.is-lesson {
  background: var(--primary-light);
  color: var(--primary);
}

.classroom-lesson-card-icon.is-quiz {
  background: var(--offense-bg);
  color: var(--offense-text);
}

/* ── Student: lesson status ── */

/* Not yet opened — vivid filled blue: demands attention */
.classroom-lesson-card-icon.is-lesson-unviewed {
  background: var(--offense-color);
  color: var(--btn-primary-text);
}

/* Opened/viewed — pale muted blue: done, quieter */
.classroom-lesson-card-icon.is-lesson-viewed {
  background: var(--offense-bg);
  color: var(--offense-text);
}

/* ── Student: quiz status ── */

/* Not submitted, not overdue — bright filled red: urgent, act now */
.classroom-lesson-card-icon.is-quiz-pending {
  background: var(--quiz-due-bg);
  color: var(--quiz-due-text);
}

/* Past due, not submitted */
.classroom-lesson-card-icon.is-quiz-overdue {
  background: var(--danger-light);
  color: var(--danger);
}

/* Submitted — awaiting marking/finalisation */
.classroom-lesson-card-icon.is-quiz-submitted-pending {
  background: var(--btn-success-bg);
  color: var(--btn-success-text);
}

/* Submitted, finalised, passed (≥60%) — muted dark green */
.classroom-lesson-card-icon.is-quiz-passed {
  background: var(--quiz-pass-bg);
  color: var(--quiz-pass-text);
}

/* Submitted, finalised, failed (<60%) — muted dusty red */
.classroom-lesson-card-icon.is-quiz-failed {
  background: var(--quiz-fail-bg);
  color: var(--quiz-fail-text);
}

.classroom-lesson-card-body {
  display: flex;
  flex-direction: column;
  flex: 1;
  min-width: 0;
  padding: var(--spacing-md);
  gap: var(--spacing-xs);
}

.classroom-lesson-card-header {
  display: flex;
  align-items: center;
  gap: var(--spacing-sm);
}

.classroom-lesson-name {
  font-size: 1rem;
  font-weight: 600;
  margin: 0;
  flex: 1;
  min-width: 0;
  overflow: hidden;
  text-overflow: ellipsis;
  white-space: nowrap;
}

.classroom-lesson-description {
  font-size: 0.85rem;
  color: var(--text-muted);
  margin: 0;
  display: -webkit-box;
  -webkit-line-clamp: 2;
  -webkit-box-orient: vertical;
  overflow: hidden;
}

.classroom-lesson-meta {
  display: flex;
  align-items: center;
  gap: var(--spacing-sm);
  flex-wrap: wrap;
  margin-top: auto;
  padding-top: var(--spacing-sm);
  border-top: 1px solid var(--card-border);
  font-size: 0.8rem;
  color: var(--text-muted);
}

/* ============================================
   Lesson Status Indicators
   ============================================ */
.lesson-status {
  display: inline-flex;
  align-items: center;
  gap: 0.2rem;
  font-size: 0.75rem;
  font-weight: 500;
  padding: 0.15rem 0.5rem;
  border-radius: var(--radius-sm);
}

.lesson-status-submitted {
  background: var(--success-light);
  color: var(--success);
}

.lesson-status-overdue {
  background: var(--danger-light);
  color: var(--danger);
}

.lesson-status-due {
  background: var(--bg-tertiary);
  color: var(--text-color);
}

.lesson-status-score {
  font-weight: 600;
  font-variant-numeric: tabular-nums;
}

/* Badge — used only for draft indicator */
.lesson-badge {
  display: inline-block;
  font-size: 0.7rem;
  font-weight: 600;
  text-transform: uppercase;
  letter-spacing: 0.03em;
  padding: 0.15rem 0.5rem;
  border-radius: var(--radius-sm);
}

.lesson-badge-draft {
  background: var(--bg-tertiary);
  color: var(--text-muted);
}

.lesson-badge-quiz {
  background: var(--primary-light);
  color: var(--primary);
}

/* ============================================
   Lesson Slideshow (single slide + navigation)
   ============================================ */
.lesson-slideshow {
  max-width: 100%;
  margin: 0 auto;
  display: flex;
  flex-direction: column;
  height: calc(100vh - 120px); /* fill viewport minus nav */
}

.lesson-slideshow-nav {
  display: flex;
  align-items: center;
  justify-content: center;
  gap: var(--spacing-lg);
  padding: var(--spacing-sm) 0;
  flex-shrink: 0;
}

.lesson-slideshow-viewport {
  flex: 1;
  min-height: 0;
  display: flex;
  align-items: flex-start;
  justify-content: center;
  overflow-y: auto;
  container-type: inline-size;
}

.lesson-slideshow-slide {
  display: none;
  width: 100%;
  height: 100%;
}

.lesson-slideshow-slide[data-active="true"] {
  display: flex;
  align-items: flex-start;
  justify-content: center;
}

.lesson-slide-content {
  background: var(--card-bg);
  border: 1px solid var(--card-border);
  border-radius: var(--radius-lg);
  padding: var(--spacing-lg);
  box-shadow: var(--shadow-sm);
  width: 100%;
  max-height: 100%;
}

/* Canvas-based slides: fill viewport at 16:9, no padding */
.lesson-slide-content[data-role="slide-canvas-viewer"] {
  padding: 0;
  overflow: hidden;
  aspect-ratio: 16 / 9;
  width: 100%;
  max-width: 100%;
  height: auto;
}

.lesson-slide-content-text .lesson-text-content {
  line-height: 1.7;
  color: var(--text-color);
  white-space: pre-wrap;
  font-size: 1.1rem;
}

.lesson-slide-content-video {
  padding: 0;
  overflow: hidden;
}

.lesson-clip-player-wrap {
  width: 100%;
  position: relative;
  background: #000;
  border-radius: var(--radius-lg) var(--radius-lg) 0 0;
}

.lesson-clip-player-wrap video {
  width: 100%;
  display: block;
}

.lesson-slide-content-play {
  text-align: center;
}

.lesson-slide-content-play h4 {
  margin-bottom: var(--spacing-sm);
}

.lesson-play-diagram {
  width: 100%;
  border-radius: var(--radius-md);
  overflow: hidden;
  background: var(--bg-tertiary);
}

.lesson-slide-content-question .lesson-question-header,
.quiz-slide-question .lesson-question-header {
  display: flex;
  align-items: center;
  gap: var(--spacing-md);
  margin-bottom: var(--spacing-md);
}

/* Captions */
.lesson-slide-caption {
  text-align: center;
  font-style: italic;
  color: var(--text-muted);
  padding: var(--spacing-sm) var(--spacing-md);
  margin: 0;
}

.lesson-slideshow-counter {
  font-size: 0.9rem;
  font-weight: 600;
  color: var(--text-muted);
  min-width: 60px;
  text-align: center;
}

/* Responsive: on small screens the slides take full width */
@media (max-width: 640px) {
  .lesson-slideshow {
    height: calc(100vh - 100px);
  }
  .lesson-slide-content {
    border-radius: 0;
  }
  .lesson-clip-player-wrap {
    border-radius: 0;
  }
}

/* ============================================
   Slide Selector Widget (game → clip picker)
   ============================================ */
.slide-selector {
  display: flex;
  flex-direction: column;
  gap: var(--spacing-sm);
  margin-bottom: var(--spacing-sm);
}

.slide-selector-step {
  display: flex;
  flex-direction: column;
  gap: var(--spacing-xs);
}

.slide-selector-clip-list {
  max-height: 250px;
  overflow-y: auto;
  display: flex;
  flex-direction: column;
  gap: 2px;
  border: 1px solid var(--border-color);
  border-radius: var(--radius-sm);
}

.slide-selector-clip-item {
  padding: var(--spacing-xs) var(--spacing-sm);
  border-left: 4px solid var(--border-color);
  cursor: pointer;
  transition: background 0.15s;
  font-size: 0.85rem;
  line-height: 1.5;
}

.slide-selector-clip-item:hover {
  background: var(--bg-secondary);
}

.slide-selector-clip-item.selected {
  background: var(--primary-light);
  border-left-color: var(--primary);
}

.slide-selector-clip-details {
  color: var(--text-color);
}

.slide-selector-clip-result {
  display: flex;
  gap: var(--spacing-xs);
  margin-top: 2px;
}

.clip-result-tag {
  font-size: 0.75rem;
  color: var(--text-muted);
}

.clip-score-tag {
  font-size: 0.75rem;
  font-weight: 700;
  text-transform: uppercase;
  color: var(--primary);
}

/* Selector Preview (shown after clip selection) */
.slide-selector-preview {
  display: flex;
  flex-direction: column;
  gap: var(--spacing-sm);
}

.slide-selector-preview-summary {
  display: flex;
  align-items: center;
  justify-content: space-between;
  padding: var(--spacing-xs) var(--spacing-sm);
  background: var(--bg-secondary);
  border-radius: var(--radius-sm);
  font-size: 0.85rem;
}

.slide-selector-preview-row {
  display: flex;
  gap: var(--spacing-md);
}

.slide-selector-preview-video {
  flex: 1;
  min-width: 0;
  position: relative;
  background: #000;
  border-radius: var(--radius-sm);
  overflow: hidden;
}

.slide-selector-preview-video video {
  width: 100%;
  display: block;
}

.slide-selector-preview-plays {
  flex: 0 0 250px;
  display: flex;
  flex-direction: column;
  gap: var(--spacing-sm);
}

.slide-selector-preview-diagram {
  display: flex;
  flex-direction: column;
  gap: 2px;
}

.slide-selector-preview-play-label {
  font-size: 0.8rem;
  font-weight: 600;
  color: var(--text-muted);
}

/* Editor play diagram (in play slides) */
.lesson-editor-play-diagram {
  width: 100%;
  min-height: 200px;
  border-radius: var(--radius-md);
  overflow: hidden;
  background: var(--bg-tertiary);
  margin-top: var(--spacing-sm);
}

/* ============================================
   Lesson Editor (block-based)
   ============================================ */
.lesson-slide-block {
  position: relative;
  transition: box-shadow 0.15s;
}

.lesson-slide-block:hover {
  box-shadow: var(--shadow-sm);
}

.lesson-slide-block.dragging {
  opacity: 0.5;
}

.lesson-slide-block.drag-over {
  border-color: var(--primary);
  box-shadow: 0 0 0 2px var(--primary-transparent);
}

.lesson-slide-block textarea {
  width: 100%;
  min-height: 100px;
  resize: vertical;
}

/* Slide header row */
.lesson-slide-header {
  display: flex;
  align-items: center;
  justify-content: space-between;
  margin-bottom: var(--spacing-sm);
}

.lesson-slide-actions {
  display: flex;
  gap: var(--spacing-xs);
}

/* Type badge */
.lesson-slide-type-badge {
  display: inline-block;
  font-size: 0.7rem;
  font-weight: 600;
  text-transform: uppercase;
  padding: 0.15rem 0.5rem;
  border-radius: var(--radius-sm);
  letter-spacing: 0.03em;
}

.lesson-slide-type-text {
  background: var(--bg-tertiary);
  color: var(--text-muted);
}

.lesson-slide-type-video {
  background: #e8f0fe;
  color: #1a73e8;
}

.lesson-slide-type-play {
  background: #fef3e0;
  color: #e67700;
}

.lesson-slide-type-question {
  background: var(--primary-light);
  color: var(--primary);
}

/* Preview area for video/play slides */
.lesson-slide-preview {
  padding: var(--spacing-sm) var(--spacing-md);
  background: var(--bg-secondary);
  border-radius: var(--radius-sm);
  margin-bottom: var(--spacing-sm);
  font-size: 0.85rem;
}

/* Question settings (answer type + max score) */
.lesson-slide-question-settings {
  display: grid;
  grid-template-columns: 1fr auto;
  gap: var(--spacing-md);
  margin-top: var(--spacing-sm);
}

/* Add-slide bar at bottom */
.lesson-add-slide-bar {
  display: flex;
  gap: var(--spacing-sm);
  flex-wrap: wrap;
  margin-top: var(--spacing-lg);
  padding: var(--spacing-md);
  background: var(--bg-secondary);
  border-radius: var(--radius-md);
  border: 1px dashed var(--border-color);
}

/* Danger zone */
.lesson-danger-zone {
  margin-top: var(--spacing-xl);
  border-color: var(--btn-danger-bg);
}

/* ============================================
   Quiz Question & Answer
   ============================================ */
.quiz-question-block {
  background: var(--bg-secondary);
  border: 1px solid var(--card-border);
  border-radius: var(--radius-md);
  padding: var(--spacing-lg);
  margin-top: var(--spacing-md);
}

.quiz-question-block label {
  font-weight: 600;
  display: block;
  margin-bottom: var(--spacing-sm);
}

.quiz-question-block textarea {
  width: 100%;
  min-height: 80px;
}

.quiz-play-editor-container {
  width: 100%;
  min-height: 300px;
  border: 1px solid var(--border-color);
  border-radius: var(--radius-md);
  overflow: hidden;
  background: var(--bg-tertiary);
}

/* ============================================
   Quiz Answers (Staff Review)
   ============================================ */
.quiz-answers-table {
  width: 100%;
  border-collapse: collapse;
}

.quiz-answers-table th,
.quiz-answers-table td {
  padding: var(--spacing-sm) var(--spacing-md);
  text-align: left;
  border-bottom: 1px solid var(--border-color);
}

.quiz-answers-table th {
  background: var(--bg-secondary);
  font-weight: 600;
  font-size: 0.85rem;
  text-transform: uppercase;
  color: var(--text-muted);
  letter-spacing: 0.03em;
}

.quiz-answers-table tr:hover td {
  background: var(--bg-secondary);
}

.quiz-score-form {
  display: inline-flex;
  align-items: center;
  gap: var(--spacing-xs);
}

.quiz-score-form input[type="number"] {
  width: 70px;
  text-align: center;
}

.quiz-score-display {
  display: inline-flex;
  align-items: center;
  gap: var(--spacing-xs);
  font-weight: 600;
}

.quiz-score-display .scored {
  color: var(--btn-success-bg);
}

.quiz-score-display .unscored {
  color: var(--text-muted);
  font-style: italic;
}

.quiz-answer-review-item {
  background: var(--card-bg);
  border: 1px solid var(--card-border);
  border-radius: var(--radius-md);
  padding: var(--spacing-lg);
  margin-bottom: var(--spacing-md);
}

.quiz-answer-review-item h4 {
  margin-bottom: var(--spacing-sm);
}

.quiz-score-input {
  width: 100px;
}

/* ============================================
   Folder Permissions
   ============================================ */
.classroom-permissions-list {
  display: flex;
  flex-direction: column;
  gap: var(--spacing-sm);
}

.classroom-permissions-list label {
  display: flex;
  align-items: center;
  gap: var(--spacing-sm);
  padding: var(--spacing-sm) var(--spacing-md);
  background: var(--card-bg);
  border: 1px solid var(--card-border);
  border-radius: var(--radius-md);
  cursor: pointer;
  transition: background 0.15s;
}

.classroom-permissions-list label:hover {
  background: var(--bg-secondary);
}

.classroom-permissions-list input[type="checkbox"] {
  width: 18px;
  height: 18px;
  accent-color: var(--primary);
}

/* Permissions table (per-group granular permissions) */
.classroom-permissions-table {
  width: 100%;
  border-collapse: collapse;
  font-size: 0.95rem;
}

.classroom-permissions-table th,
.classroom-permissions-table td {
  padding: var(--spacing-sm) var(--spacing-md);
  border-bottom: 1px solid var(--card-border);
  text-align: left;
}

.classroom-permissions-table thead th {
  font-weight: 600;
  font-size: 0.85rem;
  color: var(--text-muted);
  border-bottom: 2px solid var(--card-border);
}

.classroom-permissions-table tbody tr:hover {
  background: var(--bg-secondary);
}

.classroom-perm-col {
  text-align: center !important;
  width: 100px;
}

.classroom-permissions-table input[type="checkbox"] {
  width: 18px;
  height: 18px;
  accent-color: var(--primary);
  cursor: pointer;
}

/* ============================================
   PowerPoint-style Slide Editor
   ============================================ */

/* Main layout: sidebar + main editor */
.lesson-ppt-editor {
  display: flex;
  gap: var(--spacing-md);
  min-height: 600px;
  height: calc(100vh - 180px);
}

/* ─── Sidebar (thumbnail strip) ──────────────── */
.lesson-ppt-sidebar {
  flex: 0 0 180px;
  display: flex;
  flex-direction: column;
  gap: var(--spacing-xs);
  overflow-y: auto;
  padding: var(--spacing-xs);
  background: var(--bg-secondary);
  border: 1px solid var(--card-border);
  border-radius: var(--radius-md);
}

.lesson-ppt-thumb-list {
  display: flex;
  flex-direction: column;
  gap: var(--spacing-xs);
  flex: 1;
  overflow-y: auto;
}

.lesson-ppt-thumb {
  position: relative;
  display: flex;
  align-items: flex-start;
  gap: var(--spacing-xs);
  padding: var(--spacing-xs);
  border: 2px solid transparent;
  border-radius: var(--radius-sm);
  cursor: pointer;
  transition: border-color 0.15s, background 0.15s;
  user-select: none;
}

.lesson-ppt-thumb:hover {
  background: var(--bg-tertiary);
}

.lesson-ppt-thumb.active {
  border-color: var(--primary);
  background: var(--primary-light);
}

.lesson-ppt-thumb.dragging {
  opacity: 0.4;
}

.lesson-ppt-thumb.drag-over {
  border-color: var(--primary);
  border-style: dashed;
}

.lesson-ppt-thumb-number {
  font-size: 0.7rem;
  font-weight: 700;
  color: var(--text-muted);
  min-width: 16px;
  flex-shrink: 0;
  margin-top: 2px;
}

.lesson-ppt-thumb-preview {
  flex: 1;
  min-width: 0;
  aspect-ratio: 16 / 9;
  background: var(--card-bg);
  border: 1px solid var(--card-border);
  border-radius: var(--radius-sm);
  overflow: hidden;
  position: relative;
}

.lesson-ppt-thumb-delete {
  position: absolute;
  top: 2px;
  right: 2px;
  display: none;
  background: var(--bg-primary);
  border: none;
  border-radius: var(--radius-sm);
  font-size: 0.7rem;
  padding: 1px 3px;
  cursor: pointer;
  line-height: 1;
  z-index: 2;
}

.lesson-ppt-thumb-copy {
  position: absolute;
  top: 2px;
  right: 20px;
  display: none;
  background: var(--bg-primary);
  border: none;
  border-radius: var(--radius-sm);
  font-size: 0.7rem;
  padding: 1px 3px;
  cursor: pointer;
  line-height: 1;
  z-index: 2;
}

.lesson-ppt-thumb:hover .lesson-ppt-thumb-delete,
.lesson-ppt-thumb:hover .lesson-ppt-thumb-copy {
  display: block;
}

.lesson-ppt-add-slide {
  align-self: center;
  margin-top: var(--spacing-xs);
}

/* ─── Thumbnails (mini slide preview) ────────── */
.slide-thumbnail {
  width: 100%;
  height: 100%;
  overflow: hidden;
}

.slide-thumbnail-inner {
  width: 100%;
  height: 100%;
  position: relative;
  font-size: 5px;
}

.slide-thumbnail-empty {
  display: flex;
  align-items: center;
  justify-content: center;
  width: 100%;
  height: 100%;
  font-size: 8px;
  color: var(--text-muted);
}

.slide-thumb-item {
  position: absolute;
  overflow: hidden;
  font-size: 5px;
  line-height: 1.2;
  color: var(--text-color);
}

.slide-thumb-item-text {
  font-weight: 600;
}

.slide-thumb-item-image img {
  width: 100%;
  height: 100%;
  object-fit: cover;
}

.slide-thumb-item-play,
.slide-thumb-item-video {
  background: var(--bg-tertiary);
  border-radius: 2px;
  padding: 1px;
  text-align: center;
}

/* ─── Main editor area ───────────────────────── */
.lesson-ppt-main {
  flex: 1;
  min-width: 0;
  display: flex;
  flex-direction: column;
  overflow-y: auto;
  container-type: inline-size;
}

.lesson-ppt-canvas-container {
  flex: 3;
  min-width: 0;
  display: flex;
  flex-direction: column;
}

/* Quiz editor: side-by-side canvas + question config */
.quiz-editor-layout {
  display: flex;
  gap: var(--spacing-md);
  align-items: flex-start;
}

.quiz-editor-layout > .quiz-question-config {
  flex: 2;
  min-width: 240px;
  margin-top: 0;
}

@container (max-width: 700px) {
  .quiz-editor-layout {
    flex-direction: column;
  }
  .quiz-editor-layout > .quiz-question-config {
    min-width: 0;
  }
}

.lesson-ppt-empty {
  flex: 1;
  display: flex;
  flex-direction: column;
  align-items: center;
  justify-content: center;
  color: var(--text-muted);
  text-align: center;
  gap: var(--spacing-sm);
}

/* ─── Slide Canvas Editor ────────────────────── */
.slide-canvas-editor {
  display: flex;
  flex-direction: column;
}

.slide-editor-toolbar {
  display: flex;
  align-items: center;
  gap: var(--spacing-xs);
  padding: var(--spacing-xs) var(--spacing-sm);
  background: var(--bg-secondary);
  border: 1px solid var(--card-border);
  border-radius: var(--radius-md) var(--radius-md) 0 0;
  flex-wrap: wrap;
}

.slide-tool-btn {
  background: var(--bg-tertiary);
  border: 2px solid transparent;
  border-radius: var(--radius-sm);
  font-size: 1.1rem;
  width: 36px;
  height: 36px;
  display: flex;
  align-items: center;
  justify-content: center;
  cursor: pointer;
  transition: border-color 0.15s, box-shadow 0.15s;
  padding: 0;
}

.slide-tool-btn:hover {
  border-color: rgba(var(--primary-rgb), 0.4);
  box-shadow: 0 0 6px rgba(var(--primary-rgb), 0.3);
}

.slide-tool-btn.active {
  border-color: var(--primary);
  background: var(--primary-light);
}

.slide-tool-btn svg {
  pointer-events: none;
}

.slide-toolbar-sep {
  width: 1px;
  height: 24px;
  background: var(--border-color);
  margin: 0 var(--spacing-xs);
}

/* Canvas wrap (16:9 aspect ratio) */
.slide-canvas-wrap {
  position: relative;
  width: 100%;
  aspect-ratio: 16 / 9;
  background: var(--card-bg);
  border: 1px solid var(--card-border);
  border-top: none;
  border-radius: 0 0 var(--radius-md) var(--radius-md);
  overflow: hidden;
}

.slide-canvas-items-layer {
  position: absolute;
  inset: 0;
  z-index: 1;
}

/* Controls overlay — inside the canvas, at the bottom */
.slide-canvas-controls-overlay {
  position: absolute;
  bottom: 0;
  left: 0;
  right: 0;
  z-index: 10;
  pointer-events: none;
}

.slide-canvas-controls-overlay > * {
  pointer-events: auto;
}

.slide-canvas-controls-overlay .player-control-bar {
  display: flex;
  align-items: center;
  gap: var(--spacing-xs, 4px);
  padding: var(--spacing-xs, 4px) var(--spacing-sm, 8px);
  background: var(--surface-color);
  border-top: 1px solid var(--border-color);
  flex-wrap: nowrap;
}

/* Drawing overlay on top of items */
.slide-canvas-wrap .drawing-overlay-canvas {
  position: absolute;
  inset: 0;
  z-index: 2;
  pointer-events: none;
  touch-action: none;
  cursor: crosshair;
}

.slide-canvas-wrap .drawing-toolbar {
  position: absolute;
  bottom: 8px;
  left: 50%;
  transform: translateX(-50%);
  z-index: 3;
}

/* View-mode toolbar area: toggle button + drawing tools below canvas */
.slide-view-mode-toolbar {
  display: flex;
  align-items: center;
  justify-content: center;
  gap: var(--spacing-sm);
  padding: var(--spacing-xs) 0;
}

.slide-view-drawing-toolbar {
  position: static !important;
  transform: none !important;
  display: flex;
  justify-content: center;
  padding: 0;
}

/* ─── Slide Items (positioned on canvas) ─────── */
.slide-item {
  position: absolute;
  cursor: move;
  user-select: none;
  box-sizing: border-box;
  overflow: hidden;
}

.slide-item.selected {
  outline: 2px solid var(--primary);
  outline-offset: 1px;
}

.slide-item-resize-handle {
  position: absolute;
  bottom: 0;
  right: 0;
  width: 14px;
  height: 14px;
  background: var(--primary);
  cursor: nwse-resize;
  border-radius: 2px 0 0 0;
  opacity: 0;
  transition: opacity 0.15s;
}

.slide-item.selected .slide-item-resize-handle,
.slide-item:hover .slide-item-resize-handle {
  opacity: 1;
}

/* Text items */
.slide-item-text {
  padding: 4px;
}

.slide-item-text-content {
  width: 100%;
  height: 100%;
  overflow: hidden;
  word-wrap: break-word;
  outline: none;
  line-height: 1.3;
}

.slide-item-text-content[contenteditable="true"] {
  user-select: text;
  cursor: text;
  outline: 1px dashed var(--primary);
}

/* Image items */
.slide-item-image {
  width: 100%;
  height: 100%;
  object-fit: contain;
  -webkit-user-drag: none;
  user-select: none;
}

/* Play diagram items */
.slide-item-play {
  display: flex;
  flex-direction: column;
  border-radius: var(--radius-sm);
  overflow: hidden;
}

.slide-item-play-diagram {
  flex: 1;
  min-height: 0;
  overflow: hidden;
}

.slide-item-play-editable {
  overflow: hidden;
  display: flex;
  flex-direction: column;
}

.slide-item-play-editable .play-editor-toolbar {
  display: flex;
  gap: 6px;
  padding: 4px 6px;
  flex-shrink: 0;
}

.slide-item-play-editable .play-editor-toolbar-btn {
  width: 32px;
  height: 32px;
  padding: 0;
  display: flex;
  align-items: center;
  justify-content: center;
  background: rgba(255, 255, 255, 0.15);
  border: 1px solid rgba(255, 255, 255, 0.3);
  border-radius: var(--radius-sm);
  color: #fff;
  cursor: pointer;
  font-size: 16px;
}

.slide-item-play-editable .play-editor-toolbar-btn:hover {
  background: rgba(255, 255, 255, 0.3);
}

.slide-item-play-editable .play-editor-toolbar-btn svg {
  width: 18px;
  height: 18px;
}

.slide-item-play-editable svg {
  flex: 1;
  min-height: 0;
  width: 100%;
  display: block;
}

/* Video clip items */
.slide-item-video {
  display: flex;
  flex-direction: column;
  background: #000;
  border-radius: var(--radius-sm);
}

.slide-item-video-label {
  font-size: 0.7rem;
  font-weight: 600;
  color: #fff;
  background: rgba(0, 0, 0, 0.6);
  padding: 2px 4px;
  white-space: nowrap;
  overflow: hidden;
  text-overflow: ellipsis;
}

.slide-item-video-wrap {
  flex: 1;
  min-height: 0;
  position: relative;
  display: flex;
  flex-direction: column;
}

.slide-item-video-wrap .vp-wrapper {
  display: flex;
  flex-direction: column;
  flex: 1;
  min-height: 0;
  padding: 0;
  background: transparent;
  border: none;
  box-shadow: none;
  border-radius: 0;
}

.slide-item-video-wrap .vp-video-container {
  flex: 1;
  min-height: 0;
}

.slide-item-video-wrap .vp-video {
  width: 100%;
  height: 100%;
  object-fit: contain;
}

.slide-item-video-wrap .vp-controls {
  margin-top: 2px;
  padding: 2px 4px;
  gap: 2px;
  font-size: 0.7rem;
  flex-shrink: 0;
  background: rgba(0, 0, 0, 0.7);
}

.slide-item-video-wrap .vp-controls .icon-btn {
  width: 1.5rem;
  height: 1.5rem;
  min-width: unset;
  min-height: unset;
  font-size: 0.7rem;
}

.slide-item-video-wrap .vp-timeline {
  flex-shrink: 0;
  margin-top: 0;
}

.slide-item-video-wrap .vp-time {
  font-size: 0.6rem;
}

/* ─── Modals (play/clip selectors) ───────────── */
.lesson-ppt-modal {
  position: fixed;
  inset: 0;
  z-index: 1000;
  background: rgba(0, 0, 0, 0.5);
  display: flex;
  align-items: center;
  justify-content: center;
}

.lesson-ppt-modal-content {
  background: var(--card-bg);
  border-radius: var(--radius-lg);
  width: 90%;
  max-width: 600px;
  max-height: 80vh;
  display: flex;
  flex-direction: column;
  box-shadow: var(--shadow-xl);
}

.lesson-ppt-modal-header {
  display: flex;
  align-items: center;
  justify-content: space-between;
  padding: var(--spacing-md) var(--spacing-lg);
  border-bottom: 1px solid var(--border-color);
}

.lesson-ppt-modal-header h3 {
  margin: 0;
  font-size: 1.1rem;
}

.lesson-ppt-modal-body {
  padding: var(--spacing-lg);
  overflow-y: auto;
  display: flex;
  flex-direction: column;
  gap: var(--spacing-md);
}

.lesson-ppt-play-list,
.lesson-ppt-clip-list {
  display: flex;
  flex-direction: column;
  gap: 2px;
  max-height: 350px;
  overflow-y: auto;
}

.lesson-ppt-play-item,
.lesson-ppt-clip-item {
  padding: var(--spacing-sm) var(--spacing-md);
  cursor: pointer;
  border-radius: var(--radius-sm);
  transition: background 0.15s;
}

.lesson-ppt-play-item:hover,
.lesson-ppt-clip-item:hover {
  background: var(--primary-light);
}

/* ─── Text Toolbar ───────────────────────────── */
.slide-text-toolbar {
  display: flex;
  align-items: center;
  gap: 6px;
  position: absolute;
  bottom: 8px;
  left: 50%;
  transform: translateX(-50%);
  height: 34px;
  padding: 2px 8px;
  background: var(--bg-secondary, #2a2a2a);
  border-radius: var(--radius-sm, 4px);
  box-shadow: 0 2px 8px rgba(0,0,0,0.3);
  z-index: 200;
  white-space: nowrap;
}

.slide-text-toolbar-label {
  font-size: 11px;
  color: var(--text-secondary, #aaa);
  user-select: none;
}

.slide-text-toolbar-input {
  width: 48px;
  padding: 2px 4px;
  font-size: 12px;
  border: 1px solid var(--border-color, #444);
  border-radius: var(--radius-sm, 4px);
  background: var(--bg-primary, #1a1a1a);
  color: var(--text-primary, #fff);
  text-align: center;
}

.slide-text-toolbar-input:focus {
  outline: none;
  border-color: var(--primary, #4a90d9);
}

.slide-text-toolbar-btn {
  min-width: 28px;
  height: 28px;
  padding: 0 4px;
  font-size: 13px;
  border: 1px solid transparent;
  border-radius: var(--radius-sm, 4px);
  background: var(--bg-tertiary, #333);
  color: var(--text-primary, #fff);
  cursor: pointer;
  display: flex;
  align-items: center;
  justify-content: center;
}

.slide-text-toolbar-btn:hover {
  border-color: var(--primary, #4a90d9);
  box-shadow: 0 0 4px rgba(74,144,217,0.4);
}

.slide-text-toolbar-btn.active {
  background: var(--primary, #4a90d9);
  color: #fff;
}

.slide-text-toolbar-color {
  width: 28px;
  height: 28px;
  padding: 0;
  border: 1px solid var(--border-color, #444);
  border-radius: var(--radius-sm, 4px);
  background: none;
  cursor: pointer;
}

.slide-text-toolbar-color::-webkit-color-swatch-wrapper {
  padding: 2px;
}

.slide-text-toolbar-color::-webkit-color-swatch {
  border: none;
  border-radius: 2px;
}

.slide-text-toolbar-sep {
  width: 1px;
  height: 20px;
  background: var(--border-color, #444);
  flex-shrink: 0;
}

/* ─── Responsive ─────────────────────────────── */
@media (max-width: 768px) {
  .lesson-ppt-editor {
    flex-direction: column;
    height: auto;
  }

  .lesson-ppt-sidebar {
    flex: none;
    flex-direction: row;
    overflow-x: auto;
    overflow-y: hidden;
    max-height: 100px;
  }

  .lesson-ppt-thumb-list {
    flex-direction: row;
    overflow-x: auto;
    overflow-y: hidden;
  }

  .lesson-ppt-thumb {
    flex: 0 0 80px;
    flex-direction: column;
  }
}

/* ═══════════════════════════════════════════
   Quiz-specific styles
   ═══════════════════════════════════════════ */

/* Info bar (due date, status) */
.quiz-info-bar {
  margin-bottom: var(--spacing-md);
}

/* Quiz question slide — mirrors presentation-layout (flex: 3 / 2) */
.quiz-slide-layout {
  display: flex;
  align-items: stretch;
  width: 100%;
  aspect-ratio: 16 / 9;
  max-height: 100%;
  background: var(--card-bg);
  border: 1px solid var(--card-border);
  border-radius: var(--radius-lg);
  box-shadow: var(--shadow-sm);
  overflow: hidden;
}

.quiz-slide-layout-drawing {
  flex-direction: column;
  aspect-ratio: auto;
}

.quiz-slide-question {
  flex: 3;
  min-width: 0;
  display: flex;
  flex-direction: column;
  padding: var(--spacing-lg);
  overflow-y: auto;
}

/* Canvas viewer inside a question should fill remaining space */
.quiz-slide-question .lesson-slide-content[data-role="slide-canvas-viewer"] {
  flex: 1;
  min-height: 0;
  width: 100%;
  aspect-ratio: auto;
  border: none;
  box-shadow: none;
  border-radius: var(--radius-md);
}

.quiz-slide-answer {
  flex: 2;
  min-width: 240px;
  display: flex;
  flex-direction: column;
  padding: var(--spacing-md);
  background: var(--bg-secondary);
  border-left: 1px solid var(--card-border);
  overflow-y: auto;
}

/* Answer inputs stretch to fill available space */
.quiz-slide-answer .form-group {
  flex: 1;
  display: flex;
  flex-direction: column;
}

.quiz-slide-answer textarea.form-input {
  flex: 1;
  min-height: 80px;
  resize: vertical;
}

/* Multiple choice */
.quiz-choices {
  display: flex;
  flex-direction: column;
  gap: var(--spacing-sm);
}

.quiz-choice-option {
  display: flex;
  align-items: center;
  gap: var(--spacing-sm);
  padding: var(--spacing-sm) var(--spacing-md);
  background: var(--bg-primary);
  border: 2px solid var(--card-border);
  border-radius: var(--radius-md);
  cursor: pointer;
  transition: all 0.15s ease;
}

.quiz-choice-option:hover {
  border-color: var(--btn-primary-bg);
}

.quiz-choice-option.selected {
  border-color: var(--btn-primary-bg);
  background: rgba(var(--primary-rgb), 0.08);
}

.quiz-choice-option input[type="radio"] {
  accent-color: var(--btn-primary-bg);
}

.quiz-choice-text {
  flex: 1;
}

/* Result badges */
.quiz-result-badge {
  display: inline-flex;
  align-items: center;
  font-size: 1.5em;
  margin-left: var(--spacing-sm);
}

.quiz-result-badge-inline {
  margin-top: var(--spacing-md);
  padding: var(--spacing-sm) var(--spacing-md);
  border-radius: var(--radius-md);
  font-weight: 600;
  text-align: center;
}

.quiz-result-correct {
  color: #16a34a;
}

.quiz-result-incorrect {
  color: #dc2626;
}

/* Submit slide */
.quiz-submit-slide {
  display: flex;
  align-items: center;
  justify-content: center;
  min-height: 400px;
  text-align: center;
}

.quiz-submit-prompt,
.quiz-submit-complete {
  display: flex;
  flex-direction: column;
  align-items: center;
  gap: var(--spacing-md);
}

.quiz-submit-icon {
  font-size: 3em;
}

.quiz-final-score {
  margin-top: var(--spacing-md);
  padding: var(--spacing-md) var(--spacing-lg);
  background: var(--bg-secondary);
  border-radius: var(--radius-lg);
}

/* ═══════════════════════════════════════════
   Mark Answers / View Answers
   ═══════════════════════════════════════════ */

.quiz-marking-container {
  max-width: 1200px;
  margin: 0 auto;
}

.quiz-marking-nav {
  display: flex;
  flex-wrap: wrap;
  gap: var(--spacing-xs);
  margin-bottom: var(--spacing-lg);
  align-items: center;
}

.quiz-marking-nav-item {
  display: inline-flex;
  align-items: center;
  gap: var(--spacing-xs);
  padding: var(--spacing-xs) var(--spacing-sm);
  border-radius: var(--radius-md);
  background: var(--btn-secondary-bg);
  text-decoration: none;
  color: var(--text-color);
  font-weight: 500;
  font-size: 0.9em;
  transition: all 0.15s ease;
}

.quiz-marking-nav-item:hover {
  background: var(--btn-secondary-hover);
}

.quiz-marking-nav-item.active {
  background: var(--btn-primary-bg);
  color: #fff;
}

.quiz-marking-nav-item.marked {
  background: #d1fae5;
  color: #065f46;
}

html.dark-mode .quiz-marking-nav-item.marked {
  background: #064e3b;
  color: #a7f3d0;
}

.quiz-marking-question {
  margin-bottom: var(--spacing-lg);
}

.quiz-marking-slide-preview {
  margin-bottom: var(--spacing-lg);
}

.quiz-marking-slide-canvas {
  max-height: 300px;
  margin-top: var(--spacing-sm);
  border-radius: var(--radius-sm);
  overflow: hidden;
}

.quiz-marking-choices-reference {
  display: flex;
  flex-wrap: wrap;
  gap: var(--spacing-sm);
  margin-top: var(--spacing-sm);
  font-size: 0.9em;
}

.quiz-marking-choice-label {
  padding: var(--spacing-xs) var(--spacing-sm);
  background: var(--bg-secondary);
  border-radius: var(--radius-sm);
}

.quiz-marking-answer-label {
  font-size: 0.8em;
  margin-bottom: var(--spacing-xs);
}

.quiz-marking-answers-list {
  display: flex;
  flex-direction: column;
  gap: var(--spacing-sm);
  margin-bottom: var(--spacing-lg);
}

.quiz-marking-finalise {
  text-align: center;
  margin-top: var(--spacing-lg);
  padding: var(--spacing-md);
}

.quiz-marking-answers-grid {
  display: grid;
  grid-template-columns: repeat(auto-fill, minmax(280px, 1fr));
  gap: var(--spacing-md);
  margin-bottom: var(--spacing-lg);
}

.quiz-marking-answer-card {
  transition: all 0.15s ease;
}

.quiz-marking-answer-card.marked-correct {
  border-color: #16a34a;
  background: rgba(22, 163, 74, 0.04);
}

.quiz-marking-answer-card.marked-incorrect {
  border-color: #dc2626;
  background: rgba(220, 38, 38, 0.04);
}

html.dark-mode .quiz-marking-answer-card.marked-correct {
  background: rgba(22, 163, 74, 0.1);
}

html.dark-mode .quiz-marking-answer-card.marked-incorrect {
  background: rgba(220, 38, 38, 0.1);
}

.quiz-marking-answer-text {
  min-height: 60px;
}

.quiz-marking-drawing-preview {
  width: 100%;
  aspect-ratio: 16 / 9;
  background: var(--bg-secondary);
  border-radius: var(--radius-sm);
  overflow: hidden;
}

.quiz-marking-actions {
  display: flex;
  gap: var(--spacing-sm);
  align-items: center;
  justify-content: center;
  flex-wrap: wrap;
  padding: var(--spacing-sm);
  border-top: 1px solid var(--card-border);
}

.quiz-score-form {
  display: flex;
  gap: var(--spacing-xs);
  align-items: center;
}

.quiz-score-input {
  width: 70px;
  text-align: center;
}

.quiz-marking-result {
  font-weight: 600;
  font-size: 0.95em;
}

.quiz-mark-btn {
  font-size: 1.2em;
}

.quiz-marking-footer-nav {
  display: flex;
  align-items: center;
  justify-content: center;
  gap: var(--spacing-md);
  margin-top: var(--spacing-lg);
}

.quiz-answer-user-info {
  margin-bottom: var(--spacing-sm);
  padding-bottom: var(--spacing-xs);
  border-bottom: 1px solid var(--card-border);
}

/* Play editor in quiz answer area — fill the answer column */
.quiz-play-editor {
  flex: 1;
  min-height: 250px;
  border-radius: var(--radius-md);
  overflow: hidden;
}

/* Play selector — search-based picker above quiz play editor */
.quiz-play-selector {
  margin-bottom: var(--spacing-sm);
}

.play-selector-wrap {
  position: relative;
}

.play-selector-input {
  width: 100%;
}

/* ─── Quiz Question Config Panel (Editor) ──── */

.quiz-question-config {
  background: var(--bg-secondary);
  border: 1px solid var(--card-border);
  border-radius: var(--radius-md);
  margin-top: var(--spacing-sm);
}

.quiz-question-config-header {
  display: flex;
  align-items: center;
  padding: var(--spacing-sm) var(--spacing-md);
  border-bottom: 1px solid var(--card-border);
}

.quiz-question-config-title {
  font-weight: 600;
  font-size: 0.95rem;
}

.quiz-question-config-body {
  padding: var(--spacing-md);
  display: flex;
  flex-direction: column;
  gap: var(--spacing-md);
}

.quiz-config-row {
  display: flex;
  gap: var(--spacing-md);
  align-items: flex-end;
}

.quiz-config-field {
  flex: 1;
  margin-bottom: 0;
}

.quiz-config-field-score {
  flex: 0 0 100px;
}

.quiz-config-choices-area {
  display: flex;
  flex-direction: column;
  gap: var(--spacing-sm);
}

.quiz-config-hint {
  font-size: 0.8em;
  color: var(--text-muted);
  font-weight: normal;
}

.quiz-config-choices-list {
  display: flex;
  flex-direction: column;
  gap: var(--spacing-xs);
}

.quiz-config-choice-row {
  display: flex;
  align-items: center;
  gap: var(--spacing-sm);
}

.quiz-config-choice-row input[type="radio"] {
  accent-color: var(--btn-primary-bg);
  flex-shrink: 0;
  width: 18px;
  height: 18px;
  cursor: pointer;
}

.quiz-config-choice-input {
  flex: 1;
}

.quiz-config-choice-delete {
  background: var(--bg-tertiary);
  border: 2px solid transparent;
  border-radius: var(--radius-sm);
  cursor: pointer;
  font-size: 0.85em;
  padding: 4px 6px;
  line-height: 1;
  transition: border-color 0.15s, box-shadow 0.15s;
}

.quiz-config-choice-delete:hover {
  border-color: var(--btn-primary-bg);
  box-shadow: 0 0 6px rgba(var(--primary-rgb), 0.3);
}

.quiz-config-add-choice {
  background: var(--bg-tertiary);
  border: 2px solid transparent;
  border-radius: var(--radius-sm);
  cursor: pointer;
  padding: var(--spacing-xs) var(--spacing-sm);
  font-size: 0.85em;
  color: var(--text-color);
  align-self: flex-start;
  transition: border-color 0.15s, box-shadow 0.15s;
}

.quiz-config-add-choice:hover {
  border-color: var(--btn-primary-bg);
  box-shadow: 0 0 6px rgba(var(--primary-rgb), 0.3);
}

/* Question text display (student/marking views) */
.lesson-question-text {
  font-size: 1.1em;
  line-height: 1.5;
  color: var(--text-color);
  margin-bottom: var(--spacing-md);
  padding: var(--spacing-sm) var(--spacing-md);
  border-left: 3px solid var(--btn-primary-bg);
  background: var(--bg-secondary);
  border-radius: 0 var(--radius-sm) var(--radius-sm) 0;
}

/* Play diagram config in question editor */
.quiz-config-play-options {
  display: flex;
  flex-direction: column;
  gap: var(--spacing-sm);
}

.quiz-config-sublabel {
  font-size: 0.85em;
  color: var(--text-muted);
}

.quiz-config-play-allow-load {
  display: flex;
  align-items: center;
  gap: var(--spacing-sm);
}

.quiz-config-play-allow-load input[type="checkbox"] {
  accent-color: var(--btn-primary-bg);
  width: 18px;
  height: 18px;
  cursor: pointer;
}

.quiz-config-play-allow-load label {
  font-size: 0.9em;
  cursor: pointer;
}

/* Add slide row for quiz (side by side buttons) */
.lesson-ppt-add-slide-row {
  display: flex;
  gap: var(--spacing-xs);
  align-self: center;
  margin-top: var(--spacing-xs);
}

/* Responsive: stack columns when container is narrow */
@container (max-width: 700px) {
  .quiz-slide-layout {
    flex-direction: column;
    aspect-ratio: auto;
  }

  .quiz-slide-answer {
    border-left: none;
    border-top: 1px solid var(--card-border);
  }

  .quiz-marking-answers-grid {
    grid-template-columns: 1fr;
  }
}