{# Transcript viewer - dual-timeline interface #}

<style>
/* Transcripts app styles - all classes prefixed with .tr- to avoid conflicts */

/*
 * Layout context:
 * - date_nav: true adds has-date-nav to body, which adds date-nav-height to workspace margin-top
 * - Need to account for facet-bar + date-nav at top
 *
 * Height calculation:
 * - 100vh (viewport)
 * - minus 60px (facet-bar-height)
 * - minus 40px (date-nav-height)
 */

/* Lock workspace scrolling - content must fit, only .tr-panel scrolls */
body.has-date-nav .workspace:has(.tr-wrap) {
  overflow: hidden;
  height: calc(100vh - var(--facet-bar-height) - var(--date-nav-height));
}

body.has-app-bar.has-date-nav .workspace:has(.tr-wrap) {
  height: calc(
    100vh - var(--facet-bar-height) - var(--date-nav-height) - var(--app-bar-height) - 80px
  );
}

/* Main container */
.tr-wrap {
  max-width: 1400px;
  margin: 0 auto;
  padding: 16px 24px;
  box-sizing: border-box;
  height: 100%;
  overflow: hidden;
}

.tr-card {
  height: 100%;
  background: #ffffff;
  border: 1px solid #e5e7eb;
  border-radius: 12px;
  display: grid;
  --tr-day-col: 200px;
  --tr-zoom-col: 120px;
  grid-template-columns: var(--tr-day-col) var(--tr-zoom-col) 1fr;
  overflow: hidden;
}

/* Left timeline */
.tr-timeline {
  position: relative;
  border-right: 1px solid #d1d5db;
  user-select: none;
  height: 100%;
  overflow: hidden;
  touch-action: pan-y;
  cursor: crosshair;
  padding: 12px 0;
  box-sizing: border-box;
}

.tr-timeline-label {
  position: absolute;
  top: 0;
  left: 64px;
  right: 0;
  height: 16px;
  display: flex;
  align-items: center;
  justify-content: center;
  font-size: 12px;
  color: #9ca3af;
  text-transform: uppercase;
  letter-spacing: 0.05em;
  font-weight: 700;
  pointer-events: none;
  z-index: 3;
  border-bottom: 1px solid #e5e7eb;
}

.tr-timeline-legend {
  position: absolute;
  bottom: 0;
  left: 0;
  right: 0;
  height: 12px;
  display: flex;
  align-items: center;
  justify-content: center;
  gap: 12px;
  font-size: 12px;
  color: #9ca3af;
  pointer-events: none;
  z-index: 3;
}

.tr-legend-dot {
  display: inline-block;
  width: 8px;
  height: 8px;
  border-radius: 50%;
  margin-right: 4px;
  vertical-align: middle;
}

.tr-grid {
  position: absolute;
  top: 16px;
  bottom: 12px;
  left: 0;
  right: 0;
}

.tr-grid-hour {
  position: absolute;
  left: 0;
  right: 0;
  border-top: 1px solid #e5e7eb;
}

.tr-grid-quarter {
  position: absolute;
  left: 0;
  right: 0;
  border-top: 1px dashed #f3f4f6;
}

.tr-labels {
  position: absolute;
  left: 0;
  top: 16px;
  bottom: 12px;
  width: 64px;
  background: #f9fafb;
  border-right: 1px solid #e5e7eb;
  pointer-events: none;
}

.tr-label {
  position: absolute;
  right: 0;
  padding-right: 8px;
  transform: translateY(-50%);
  font-size: 12px;
  color: #6b7280;
  font-variant-numeric: tabular-nums;
}

/* Selection box */
.tr-sel-wrap {
  position: absolute;
  left: 64px;
  right: 8px;
  pointer-events: none;
  z-index: 2;
}

.tr-sel {
  position: absolute;
  left: 0;
  right: -4px;
  height: 100%;
  background: rgba(239, 246, 255, 0.7);
  border: 1px solid #c7d2fe;
  border-radius: 12px;
  box-shadow: 0 1px 2px rgba(0,0,0,.06);
  pointer-events: auto;
  cursor: grab;
  touch-action: none;
}

.tr-sel:active {
  cursor: grabbing;
}

.tr-sel:hover {
  background: rgba(239, 246, 255, 0.85);
  border-color: #a5b4fc;
}

.tr-sel:focus-visible {
  outline: 2px solid var(--accent, #4a9eff);
  outline-offset: 2px;
}

.tr-bumper {
  position: absolute;
  left: 28px;
  right: 28px;
  margin: auto;
  height: 14px;
  border: 1px solid #60a5fa;
  border-radius: 999px;
  background: #dbeafe;
  cursor: ns-resize;
  touch-action: none;
  transition: background 0.15s ease, border-color 0.15s ease;
}

.tr-bumper-top {
  top: -7px;
}

.tr-bumper-bottom {
  bottom: -7px;
}

.tr-bumper:hover {
  background: #bfdbfe;
  border-color: #3b82f6;
}

.tr-bumper:active {
  background: #93c5fd;
  border-color: #2563eb;
}

/* Segments lane (audio/screen indicators) */
.tr-segments {
  --seg-col-0: 8px;
  --seg-col-1: 56px;
  position: absolute;
  left: 64px;
  right: 0;
  top: 16px;
  bottom: 12px;
  pointer-events: none;
  z-index: 1;
}

.tr-seg {
  position: absolute;
  width: 40px;
  border-radius: 12px;
  box-shadow: 0 1px 1px rgba(0,0,0,.04);
  pointer-events: auto;
  cursor: pointer;
  transition: filter 0.15s ease, box-shadow 0.15s ease;
}

.tr-seg:focus-visible {
  outline: 2px solid var(--accent, #4a9eff);
  outline-offset: 1px;
}

.tr-seg:hover {
  filter: brightness(0.92);
  box-shadow: 0 2px 4px rgba(0,0,0,.10);
}

.tr-seg:active {
  filter: brightness(0.88);
  box-shadow: 0 1px 2px rgba(0,0,0,.08);
}

.tr-seg-col-0 { left: var(--seg-col-0); }
.tr-seg-col-1 { left: var(--seg-col-1); }

.tr-seg-audio {
  background: rgba(134, 239, 172, 0.6);
  border: 1px solid #4ade80;
}

.tr-seg-screen {
  background: rgba(253, 230, 138, 0.6);
  border: 1px solid #eab308;
}

.tr-now-marker {
  position: absolute;
  left: 64px;
  right: 0;
  height: 0;
  border-top: 2px solid #ef4444;
  z-index: 3;
  pointer-events: none;
}

.tr-now-label {
  position: absolute;
  left: 4px;
  top: -8px;
  font-size: 12px;
  color: #ef4444;
  font-weight: 500;
  line-height: 1;
}

/* Right content panel */
.tr-content {
  padding: 4px 24px 24px;
  display: flex;
  flex-direction: column;
  gap: 16px;
  height: 100%;
  box-sizing: border-box;
  overflow: hidden;
}

.tr-header {
  display: flex;
  align-items: center;
  justify-content: space-between;
  flex-wrap: wrap;
  gap: 12px;
}

.tr-header > div {
  display: flex;
  flex-direction: column;
  gap: 2px;
}

.tr-title {
  font-size: 20px;
  font-weight: 600;
  margin: 0;
}

.tr-range-text {
  color: #6b7280;
  font-size: 13px;
  font-variant-numeric: tabular-nums;
}

.tr-tabs {
  gap: 8px;
  padding: 8px 0;
  border-bottom: 1px solid #e5e7eb;
  flex-shrink: 0;
  display: none;
}

.tr-tabs.visible {
  display: flex;
}

.tr-tab {
  padding: 8px;
  margin: 0 -8px;
  border: 1px solid #d1d5db;
  border-radius: 6px;
  font-size: 13px;
  cursor: pointer;
  background: #fff;
  color: #374151;
  transition: all 0.15s;
}

.tr-tab:hover {
  background: #f9fafb;
}

.tr-tab.active {
  background: #3b82f6;
  border-color: #3b82f6;
  color: #fff;
}

.tr-tab:focus-visible {
  outline: 2px solid var(--accent, #4a9eff);
  outline-offset: 1px;
}

.tr-tab:active:not(.active) {
  background: #f3f4f6;
  border-color: #9ca3af;
}

.tr-tab-pane {
  display: none;
  height: 100%;
}

.tr-tab-pane:focus-visible {
  outline: 2px solid var(--accent, #4a9eff);
  outline-offset: 2px;
}

.tr-tab-pane.active {
  display: block;
}

.tr-md-content {
  padding: 16px;
  line-height: 1.6;
  font-size: 14px;
  max-width: 70ch;
}

.tr-md-content h1, .tr-md-content h2, .tr-md-content h3 {
  margin-top: 16px;
  margin-bottom: 8px;
}

.tr-md-content p {
  margin-bottom: 12px;
}

.tr-md-content ul, .tr-md-content ol {
  margin-bottom: 12px;
  padding-left: 24px;
}

.tr-md-content code {
  background: #f3f4f6;
  padding: 2px 6px;
  border-radius: 4px;
  font-size: 13px;
}

.tr-md-content pre {
  background: #f3f4f6;
  padding: 12px;
  border-radius: 6px;
  overflow-x: auto;
  margin-bottom: 12px;
}

.tr-screen-text {
  padding: 8px 12px;
  color: #374151;
  font-size: 13px;
  border-left: 3px solid #e5e7eb;
  margin: 4px 0;
}

/* Delete button */
.tr-delete-btn {
  display: none;
  align-items: center;
  justify-content: center;
  width: 32px;
  height: 32px;
  padding: 0;
  border: 1px solid #e5e7eb;
  border-radius: 6px;
  background: #fff;
  color: #9ca3af;
  cursor: pointer;
  transition: all 0.15s;
  margin-left: 8px;
}

.tr-delete-btn:hover {
  background: #fef2f2;
  border-color: #fecaca;
  color: #ef4444;
}

.tr-delete-btn:focus-visible {
  outline: 2px solid #ef4444;
  outline-offset: 2px;
}

.tr-delete-btn:active {
  background: #fee2e2;
  border-color: #f87171;
  color: #dc2626;
}

.tr-delete-btn.visible {
  display: flex;
}

.tr-delete-btn svg {
  width: 16px;
  height: 16px;
}

.tr-panel {
  flex: 1;
  padding: 16px;
  overflow-y: auto;
  min-height: 0;
  overflow-x: hidden;
  font-size: 14px;
  line-height: 1.5;
  transition: opacity 0.1s ease;
}

.tr-panel.loading {
  opacity: 0.5;
}

.tr-panel pre {
  white-space: pre-wrap;
  word-wrap: break-word;
  overflow-wrap: break-word;
}

.tr-panel code {
  white-space: pre-wrap;
  word-wrap: break-word;
}

/* Middle zoom timeline (segment selector) */
.tr-zoom {
  position: relative;
  border-right: 1px solid #e5e7eb;
  user-select: none;
  height: 100%;
  overflow: hidden;
  padding: 12px 0;
  box-sizing: border-box;
}

.tr-zoom-timeline-label {
  position: absolute;
  top: 0;
  left: 0;
  right: 0;
  height: 16px;
  display: flex;
  align-items: center;
  justify-content: center;
  font-size: 12px;
  color: #9ca3af;
  text-transform: uppercase;
  letter-spacing: 0.05em;
  font-weight: 700;
  pointer-events: none;
  z-index: 3;
  border-bottom: 1px solid #e5e7eb;
}

.tr-zoom-labels {
  position: absolute;
  left: 0;
  top: 16px;
  bottom: 12px;
  width: 48px;
  background: #f9fafb;
  border-right: 1px solid #e5e7eb;
  pointer-events: none;
}

.tr-zoom-label {
  position: absolute;
  right: 0;
  padding-right: 8px;
  transform: translateY(-50%);
  font-size: 12px;
  color: #6b7280;
  font-variant-numeric: tabular-nums;
}

.tr-zoom-grid {
  position: absolute;
  top: 16px;
  bottom: 12px;
  left: 0;
  right: 0;
}

.tr-zoom-segments {
  position: absolute;
  left: 52px;
  right: 4px;
  top: 16px;
  bottom: 12px;
}

.tr-zoom-segments > .surface-state {
  position: absolute;
  inset: 0;
  padding: 16px 12px;
  gap: 8px;
}

.tr-zoom-segments > .surface-state .surface-state-icon svg {
  width: 32px;
  height: 32px;
}

.tr-zoom-segments > .surface-state .surface-state-heading {
  font-size: 13px;
}

.tr-zoom-segments > .surface-state .surface-state-desc {
  font-size: 11px;
  max-width: 24ch;
}

/* Segment pills in zoom view */
.tr-zoom-pill {
  position: absolute;
  left: 0;
  right: 0;
  border-radius: 8px;
  cursor: pointer;
  transition: all 0.15s ease;
  box-shadow: 0 1px 2px rgba(0,0,0,.08);
}

.tr-zoom-pill:hover {
  filter: brightness(0.95);
  box-shadow: 0 2px 4px rgba(0,0,0,.12);
}

.tr-zoom-pill.tr-active {
  box-shadow: 0 0 0 2px rgba(74, 158, 255, 0.5), 0 2px 4px rgba(0,0,0,.12);
}

.tr-zoom-pill:focus-visible {
  outline: 2px solid var(--accent, #4a9eff);
  outline-offset: 1px;
}

.tr-zoom-pill:active {
  filter: brightness(0.90);
  transform: scale(0.98);
}

.tr-zoom-pill-audio {
  background: linear-gradient(135deg, rgba(134, 239, 172, 0.8), rgba(134, 239, 172, 0.6));
  border: 1px solid #4ade80;
}

.tr-zoom-pill-screen {
  background: linear-gradient(135deg, rgba(253, 230, 138, 0.8), rgba(253, 230, 138, 0.6));
  border: 1px solid #eab308;
}

.tr-zoom-pill-both {
  background: linear-gradient(to right, rgba(134, 239, 172, 0.75), rgba(194, 234, 155, 0.7) 50%, rgba(253, 230, 138, 0.75));
  border: 1px solid #84cc16;
}

/* Dragging state */
.tr-dragging {
  user-select: none;
  -webkit-user-select: none;
}

/* Image modal */
.tr-screenshot-modal {
  position: fixed;
  inset: 0;
  background: rgba(0,0,0,0.85);
  display: flex;
  z-index: 1000;
}

.tr-modal-nav {
  width: 48px;
  display: flex;
  align-items: center;
  justify-content: center;
  cursor: pointer;
  color: rgba(255,255,255,0.4);
  transition: all 0.15s;
  flex-shrink: 0;
}

.tr-modal-nav:hover {
  background: rgba(255,255,255,0.1);
  color: rgba(255,255,255,0.9);
}

.tr-modal-nav:active {
  background: rgba(255,255,255,0.2);
  color: rgba(255,255,255,1);
}

.tr-modal-nav:focus-visible {
  outline: 2px solid rgba(255,255,255,0.6);
  outline-offset: -2px;
}

.tr-modal-nav.disabled {
  cursor: default;
  color: rgba(255,255,255,0.15);
  pointer-events: none;
}

.tr-modal-nav svg {
  width: 24px;
  height: 24px;
}

.tr-modal-center {
  flex: 1;
  display: flex;
  flex-direction: column;
  min-width: 0;
}

.tr-modal-header {
  display: flex;
  align-items: center;
  gap: 12px;
  padding: 16px 20px;
  flex-shrink: 0;
}

.tr-modal-badge {
  padding: 4px 10px;
  border-radius: 6px;
  font-size: 12px;
  font-weight: 500;
  background: rgba(255,255,255,0.15);
  color: #fff;
}

.tr-modal-badge-monitor {
  background: rgba(124, 58, 237, 0.3);
  color: #c4b5fd;
}

.tr-modal-badge-category {
  background: rgba(59, 130, 246, 0.3);
  color: #93c5fd;
}

.tr-modal-close {
  margin-left: auto;
  width: 36px;
  height: 36px;
  background: rgba(255,255,255,0.15);
  border: none;
  border-radius: 50%;
  color: #fff;
  font-size: 18px;
  cursor: pointer;
  transition: background 0.15s ease;
  display: flex;
  align-items: center;
  justify-content: center;
  flex-shrink: 0;
}

.tr-modal-close:hover {
  background: rgba(255,255,255,0.3);
}

.tr-modal-close:active {
  background: rgba(255,255,255,0.4);
}

.tr-modal-close:focus-visible {
  outline: 2px solid rgba(255,255,255,0.6);
  outline-offset: 2px;
}

.tr-modal-img-wrap {
  flex: 1;
  display: flex;
  align-items: center;
  justify-content: center;
  min-height: 0;
  padding: 0 20px;
}

.tr-modal-img-wrap img,
.tr-modal-img-wrap canvas {
  display: block;
  max-width: 100%;
  max-height: 100%;
  object-fit: contain;
  border-radius: 8px;
  background: #1f2937;
}

.tr-modal-img-wrap canvas.loading {
  animation: tr-pulse 1.5s ease-in-out infinite;
}

.tr-modal-img-wrap canvas.tr-masked-canvas {
  cursor: pointer;
  transition: opacity 0.15s ease;
}

.tr-modal-img-wrap canvas.tr-masked-canvas:hover {
  opacity: 0.9;
}

.tr-modal-badge-masked {
  background: rgba(239, 68, 68, 0.3);
  color: #fca5a5;
}

.tr-modal-description {
  padding: 12px 20px 20px;
  color: rgba(255,255,255,0.8);
  font-size: 14px;
  line-height: 1.5;
  text-align: center;
  flex-shrink: 0;
}

#trDeleteSegmentModal {
  position: fixed;
  inset: 0;
  display: none;
  align-items: center;
  justify-content: center;
  padding: 24px;
  background: rgba(15, 23, 42, 0.55);
  z-index: 1100;
}

#trDeleteSegmentModal .modal-content {
  width: min(520px, 100%);
  background: #ffffff;
  border-radius: 16px;
  box-shadow: 0 24px 48px rgba(15, 23, 42, 0.22);
  overflow: hidden;
}

#trDeleteSegmentModal .modal-header {
  display: flex;
  align-items: center;
  justify-content: space-between;
  padding: 20px 24px 16px;
  border-bottom: 1px solid #e5e7eb;
}

#trDeleteSegmentModal .modal-header h3 {
  margin: 0;
  font-size: 20px;
  font-weight: 700;
  color: #111827;
}

#trDeleteSegmentModal .modal-header.danger h3 {
  color: #991b1b;
}

#trDeleteSegmentModal .modal-body {
  padding: 20px 24px;
}

#trDeleteSegmentModal .modal-footer {
  display: flex;
  justify-content: flex-end;
  gap: 12px;
  padding: 0 24px 24px;
}

#trDeleteSegmentModal .close {
  color: #9ca3af;
  font-size: 28px;
  line-height: 1;
  cursor: pointer;
  transition: color 0.15s ease;
}

#trDeleteSegmentModal .close:hover {
  color: #4b5563;
}

#trDeleteSegmentModal .close:active {
  color: #111827;
}

#trDeleteSegmentModal .btn-secondary,
#trDeleteSegmentModal .btn-danger {
  border: none;
  border-radius: 10px;
  padding: 10px 18px;
  font-size: 14px;
  font-weight: 600;
  cursor: pointer;
  transition: background 0.15s ease, color 0.15s ease, transform 0.15s ease;
}

#trDeleteSegmentModal .btn-secondary {
  background: #f3f4f6;
  color: #374151;
}

#trDeleteSegmentModal .btn-secondary:hover {
  background: #e5e7eb;
}

#trDeleteSegmentModal .btn-secondary:active {
  transform: translateY(1px);
}

#trDeleteSegmentModal .btn-danger {
  background: #dc2626;
  color: #ffffff;
}

#trDeleteSegmentModal .btn-danger:hover {
  background: #b91c1c;
}

#trDeleteSegmentModal .btn-danger:active {
  transform: translateY(1px);
}

#trDeleteSegmentModal .delete-warning {
  padding: 16px 18px;
  border-radius: 12px;
  background: #fef2f2;
  border-left: 4px solid #dc2626;
  color: #7f1d1d;
}

#trDeleteSegmentModal .delete-warning p {
  margin: 0 0 12px;
}

#trDeleteSegmentModal .delete-warning p:last-child {
  margin-bottom: 0;
}

#trDeleteSegmentModal .tr-delete-segment-meta {
  font-size: 14px;
  color: #991b1b;
}

#trDeleteSegmentModal .tr-delete-segment-list {
  margin: 0 0 12px;
  padding-left: 20px;
}

#trDeleteSegmentModal .tr-delete-segment-list li + li {
  margin-top: 6px;
}

#trDeleteSegmentModal .tr-delete-segment-size {
  font-size: 13px;
  color: #7f1d1d;
}

/* Unified timeline view */
.tr-unified {
  display: flex;
  flex-direction: column;
  gap: 12px;
}

.tr-audio-players {
  display: flex;
  flex-wrap: wrap;
  gap: 12px;
  padding: 16px;
  background: #f9fafb;
  border-radius: 12px;
  border: 1px solid #e5e7eb;
}

.tr-audio-player {
  flex: 1;
  min-width: 200px;
}

.tr-audio-player audio {
  width: 100%;
}

.tr-audio-player-label {
  font-size: 12px;
  color: #6b7280;
  margin-bottom: 4px;
}

.tr-purge-notice {
  padding: 0.5em 0.75em;
  margin-bottom: 0.5em;
  font-size: 0.8em;
  color: #888;
  background: #f8f8f8;
  border-radius: 4px;
  border-left: 3px solid #ccc;
}

.tr-entry {
  display: flex;
  gap: 12px;
  padding: 10px 12px;
  border-radius: 8px;
  cursor: pointer;
  transition: background 0.15s;
}

.tr-entry:hover {
  background: #f9fafb;
}

.tr-entry-audio {
  border-left: 3px solid #86efac;
}

.tr-entry-audio:focus-visible {
  outline: 2px solid var(--accent, #4a9eff);
  outline-offset: -1px;
}

.tr-entry-audio:active {
  background: #f0f9ff;
}

.tr-entry.tr-entry-active {
  background: #f0f9ff;
  border-left-color: #3b82f6;
}

.tr-entry-screen {
  border-left: 3px solid #facc15;
}

.tr-entry-time {
  flex-shrink: 0;
  width: 48px;
  font-size: 12px;
  color: #6b7280;
  font-family: ui-monospace, monospace;
}

.tr-entry-content {
  flex: 1;
  min-width: 0;
}

.tr-entry-text {
  font-size: 14px;
  line-height: 1.5;
}

.tr-entry-meta {
  font-size: 11px;
  color: #9ca3af;
  margin-top: 2px;
}

.tr-entry-thumb {
  flex-shrink: 0;
  width: 120px;
  height: 68px;
  border-radius: 6px;
  object-fit: cover;
  border: 1px solid #e5e7eb;
  background: #f3f4f6;
  cursor: pointer;
  transition: box-shadow 0.15s ease, border-color 0.15s ease;
}

.tr-entry-thumb:hover {
  box-shadow: 0 2px 8px rgba(0,0,0,.12);
  border-color: #d1d5db;
}

.tr-entry-thumb.loading {
  animation: tr-pulse 1.5s ease-in-out infinite;
}

@keyframes tr-pulse {
  0%, 100% { opacity: 0.6; }
  50% { opacity: 1; }
}

.tr-entry-screen .tr-entry-content {
  display: flex;
  gap: 12px;
  align-items: center;
}

.tr-entry-desc {
  flex: 1;
  font-size: 13px;
  color: #374151;
  line-height: 1.5;
}

.tr-entry-badge {
  display: inline-block;
  padding: 2px 6px;
  border-radius: 4px;
  font-size: 12px;
  font-weight: 500;
  background: #dbeafe;
  color: #1d4ed8;
  margin-right: 6px;
}

.tr-entry-badge-monitor {
  background: #f3e8ff;
  color: #7c3aed;
}

.tr-speaker-label {
  display: inline-flex;
  align-items: center;
  gap: 4px;
  font-size: 12px;
  font-weight: 500;
  color: #374151;
  margin-bottom: 2px;
}

.tr-speaker-label a {
  color: #374151;
  text-decoration: none;
}

.tr-speaker-label a:hover {
  color: #374151;
  text-decoration: underline;
}

.tr-speaker-label a:focus-visible {
  outline: 2px solid var(--accent, #4a9eff);
  outline-offset: 2px;
  border-radius: 2px;
}

.tr-speaker-label a:active {
  color: #1f2937;
}

.tr-speaker-label-owner {
  color: #4f46e5;
}

.tr-speaker-label-owner a {
  color: #4f46e5;
}

.tr-speaker-label-owner a:active {
  color: #3730a3;
}

.tr-speaker-dot {
  display: inline-block;
  width: 8px;
  height: 8px;
  border-radius: 50%;
}

.tr-speaker-dot-high {
  background: #22c55e;
}

.tr-speaker-dot-medium {
  background: #eab308;
}

.tr-panel > .surface-state {
  min-height: 100%;
}

.tr-warning-notice {
  display: none;
  align-items: center;
  gap: 8px;
  padding: 8px 12px;
  font-size: 13px;
  color: #92400e;
  background: #fffbeb;
  border: 1px solid #fde68a;
  border-radius: 0 0 8px 8px;
  margin-top: auto;
  transition: opacity 0.3s ease;
}

.tr-warning-notice.visible {
  display: flex;
}

.tr-warning-notice svg {
  width: 16px;
  height: 16px;
  flex-shrink: 0;
  stroke: #f59e0b;
  fill: none;
  stroke-width: 2;
  stroke-linecap: round;
  stroke-linejoin: round;
}

/* Markdown content styling within screen entries */
.tr-entry-desc h3 {
  display: none; /* Hide timestamp header - already shown in time column */
}

.tr-entry-desc p {
  margin: 4px 0;
}

.tr-entry-desc strong {
  color: #1f2937;
}

.tr-entry-desc pre {
  background: #f3f4f6;
  border: 1px solid #e5e7eb;
  border-radius: 6px;
  padding: 8px 12px;
  margin: 8px 0;
  overflow-x: auto;
  font-size: 12px;
}

.tr-entry-desc code {
  font-family: ui-monospace, monospace;
  font-size: 12px;
}

.tr-entry-desc pre code {
  background: none;
  padding: 0;
}

/* Basic frame groups - collapsed by default */
.tr-group {
  border-left: 3px solid #e5e7eb;
  border-radius: 8px;
  margin: 4px 0;
  background: #fafafa;
}

.tr-group-header {
  display: flex;
  align-items: center;
  gap: 12px;
  padding: 8px 12px;
  cursor: pointer;
  user-select: none;
}

.tr-group-header:hover {
  background: #f3f4f6;
}

.tr-group-header:focus-visible {
  outline: 2px solid var(--accent, #4a9eff);
  outline-offset: -1px;
}

.tr-group-header:active {
  background: #e5e7eb;
}

.tr-group-chevron {
  width: 16px;
  height: 16px;
  color: #9ca3af;
  transition: transform 0.15s;
  flex-shrink: 0;
}

.tr-group.expanded .tr-group-chevron {
  transform: rotate(90deg);
}

.tr-group-time {
  font-size: 12px;
  color: #6b7280;
  font-family: ui-monospace, monospace;
  flex-shrink: 0;
  line-height: 16px;
}

.tr-group-count {
  font-size: 12px;
  color: #9ca3af;
  line-height: 16px;
}

.tr-group-grid {
  display: none;
  padding: 8px 12px 12px;
  gap: 10px;
  grid-template-columns: repeat(auto-fill, minmax(100px, 1fr));
}

.tr-group.expanded .tr-group-grid {
  display: grid;
}

.tr-group-item {
  position: relative;
  cursor: pointer;
  border-radius: 6px;
  overflow: hidden;
  border: 1px solid #e5e7eb;
  transition: box-shadow 0.15s, transform 0.15s;
}

.tr-group-item:hover {
  box-shadow: 0 2px 8px rgba(0,0,0,0.12);
}

.tr-group-item:focus-visible {
  outline: 2px solid var(--accent, #4a9eff);
  outline-offset: 1px;
}

.tr-group-item:active {
  box-shadow: 0 1px 2px rgba(0,0,0,.08);
  transform: scale(0.97);
}

.tr-group-item img,
.tr-group-item canvas {
  width: 100%;
  aspect-ratio: 16/9;
  object-fit: cover;
  display: block;
  background: #f3f4f6;
}

.tr-group-item canvas.loading {
  animation: tr-pulse 1.5s ease-in-out infinite;
}

.tr-group-item-badge {
  position: absolute;
  bottom: 4px;
  left: 4px;
  padding: 2px 6px;
  border-radius: 4px;
  font-size: 12px;
  font-weight: 500;
  background: rgba(0,0,0,0.6);
  color: #fff;
  max-width: calc(100% - 8px);
  overflow: hidden;
  text-overflow: ellipsis;
  white-space: nowrap;
}

.sr-only {
  position: absolute;
  width: 1px;
  height: 1px;
  padding: 0;
  margin: -1px;
  overflow: hidden;
  clip: rect(0, 0, 0, 0);
  white-space: nowrap;
  border: 0;
}

/* ── Presentation mode (?present=1) — back-row legibility on a projector ── */
body.presentation-mode .tr-card { --tr-day-col: 240px; --tr-zoom-col: 150px; }
body.presentation-mode .tr-timeline-label,
body.presentation-mode .tr-timeline-legend,
body.presentation-mode .tr-zoom-timeline-label { font-size: 14px; font-weight: 700; }
body.presentation-mode .tr-label,
body.presentation-mode .tr-zoom-label { font-size: 14px; color: #1f2937; }
body.presentation-mode .tr-now-label { font-size: 14px; font-weight: 700; }
body.presentation-mode .tr-now-marker { border-top-width: 3px; }
body.presentation-mode .tr-seg { width: 48px; box-shadow: 0 2px 4px rgba(0,0,0,.10); }
body.presentation-mode .tr-seg-audio { background: rgba(74, 222, 128, 0.85); border-width: 2px; }
body.presentation-mode .tr-seg-screen { background: rgba(234, 179, 8, 0.85); border-width: 2px; }
body.presentation-mode .tr-zoom-pill { font-weight: 700; }
body.presentation-mode .tr-content { padding: 8px 28px 28px; gap: 20px; }
body.presentation-mode .tr-title { font-size: 28px; color: #0b1220; }
body.presentation-mode .tr-range-text { font-size: 16px; color: #4b5563; }
body.presentation-mode .tr-tabs { padding: 12px 0; border-bottom-width: 2px; }
body.presentation-mode .tr-tab { font-size: 16px; font-weight: 600; padding: 10px 16px; border-width: 2px; }
body.presentation-mode .tr-tab.active { background: #2563eb; border-color: #2563eb; }
body.presentation-mode .tr-md-content {
  font-size: 19px;
  line-height: 1.65;
  padding: 20px;
  max-width: 78ch;
  color: #0b1220;
}
body.presentation-mode .tr-md-content code { font-size: 17px; }
body.presentation-mode .tr-panel { font-size: 18px; line-height: 1.6; padding: 20px; }
body.presentation-mode .tr-entry-time { width: 64px; font-size: 16px; color: #1f2937; font-weight: 600; }
body.presentation-mode .tr-entry-text { font-size: 19px; line-height: 1.6; color: #0b1220; }
body.presentation-mode .tr-entry-meta { font-size: 14px; color: #6b7280; margin-top: 4px; }
body.presentation-mode .tr-screen-text { font-size: 16px; padding: 12px 16px; border-left-width: 4px; color: #1f2937; }
</style>

<div class="tr-wrap">
  <div class="tr-card">
    <!-- Left timeline -->
    <div id="trTimeline" class="tr-timeline" aria-label="day timeline">
      <div class="tr-timeline-label">day</div>
      <div class="tr-grid" id="trGrid"></div>
      <div class="tr-labels" id="trLabels"></div>
      <div class="tr-segments" id="trSegments"></div>
      <div class="tr-sel-wrap" id="trSelWrap">
        <div class="tr-sel" data-handle="move">
          <div class="tr-bumper tr-bumper-top" data-handle="start" title="drag to adjust start"></div>
          <div class="tr-bumper tr-bumper-bottom" data-handle="end" title="drag to adjust end"></div>
        </div>
      </div>
      <div class="tr-timeline-legend">
        <span><span class="tr-legend-dot" style="background: #86efac;"></span>audio</span>
        <span><span class="tr-legend-dot" style="background: #facc15;"></span>screen</span>
      </div>
    </div>

    <!-- Middle zoom timeline -->
    <div class="tr-zoom" id="trZoom">
      <div class="tr-zoom-timeline-label">detail</div>
      <div class="tr-zoom-grid" id="trZoomGrid"></div>
      <div class="tr-zoom-labels" id="trZoomLabels"></div>
      <div class="tr-zoom-segments" id="trZoomSegments"></div>
    </div>

    <!-- Right content panel -->
    <div class="tr-content">
      <div class="tr-header">
        <div>
          <h2 class="tr-title">transcripts</h2>
          <div class="tr-range-text" id="trRangeText"></div>
        </div>
        <button type="button" id="trDeleteBtn" class="tr-delete-btn" title="delete segment">
          <svg viewBox="0 0 24 24" fill="none" stroke="currentColor" stroke-width="2" stroke-linecap="round" stroke-linejoin="round">
            <polyline points="3 6 5 6 21 6"></polyline>
            <path d="M19 6v14a2 2 0 0 1-2 2H7a2 2 0 0 1-2-2V6m3 0V4a2 2 0 0 1 2-2h4a2 2 0 0 1 2 2v2"></path>
          </svg>
        </button>
      </div>
      <div class="tr-tabs" id="trTabs"></div>
      <div id="trWarningNotice" class="tr-warning-notice">
        <svg viewBox="0 0 24 24"><path d="M10.29 3.86L1.82 18a2 2 0 0 0 1.71 3h16.94a2 2 0 0 0 1.71-3L13.71 3.86a2 2 0 0 0-3.42 0z"></path><line x1="12" y1="9" x2="12" y2="13"></line><line x1="12" y1="17" x2="12.01" y2="17"></line></svg>
        <span id="trWarningText"></span>
      </div>
      <div class="tr-panel" id="trPanel">
        <div class="surface-state surface-state--empty">
          <div class="surface-state-icon" aria-hidden="true"><svg viewBox="0 0 24 24"><circle cx="12" cy="12" r="10"></circle><polyline points="12 6 12 12 16 14"></polyline></svg></div>
          <h2 class="surface-state-heading">your day at a glance</h2>
          <p class="surface-state-desc">select a segment from the timeline to view its transcript</p>
        </div>
      </div>
    </div>
  </div>
</div>

<div id="trDeleteSegmentModal" class="modal" style="display: none;" role="dialog" aria-modal="true" aria-labelledby="trDeleteSegmentModalTitle">
  <div class="modal-content">
    <div class="modal-header danger">
      <h3 id="trDeleteSegmentModalTitle">delete segment?</h3>
      <span class="close" id="trDeleteSegmentModalClose" onclick="closeDeleteSegmentModal()">&times;</span>
    </div>
    <div class="modal-body">
      <div id="trDeleteSegmentModalBody" class="delete-warning"></div>
    </div>
    <div class="modal-footer">
      <button type="button" class="btn-secondary" onclick="closeDeleteSegmentModal()">cancel</button>
      <button type="button" id="trDeleteSegmentModalConfirm" class="btn-danger" onclick="confirmDeleteSegment()">delete</button>
    </div>
  </div>
</div>

<script>
(() => {
  const escapeHtml = window.AppServices.escapeHtml;
  // Timeline bounds - computed dynamically from content
  const DEFAULT_START = 8 * 60;   // 8:00 AM default
  const DEFAULT_END = 20 * 60;    // 8:00 PM default
  const MIN_SPAN = 12 * 60;       // Minimum 12-hour span
  const BUFFER = 30;              // 30-minute buffer on each side

  let timelineStart = DEFAULT_START;
  let timelineEnd = DEFAULT_END;

  const STEP = 15;
  const DEFAULT_LEN = 60;
  const MIN_LEN = 15;

  const day = '{{ day }}';

  // Elements - main timeline
  const timeline = document.getElementById('trTimeline');
  const grid = document.getElementById('trGrid');
  const labels = document.getElementById('trLabels');
  const segmentsLane = document.getElementById('trSegments');
  const selWrap = document.getElementById('trSelWrap');
  const sel = selWrap.querySelector('.tr-sel');

  // Elements - zoom timeline
  const zoom = document.getElementById('trZoom');
  const zoomGrid = document.getElementById('trZoomGrid');
  const zoomLabels = document.getElementById('trZoomLabels');
  const zoomSegments = document.getElementById('trZoomSegments');

  // Elements - content panel
  const titleEl = document.querySelector('.tr-title');
  const rangeText = document.getElementById('trRangeText');
  const tabsContainer = document.getElementById('trTabs');
  tabsContainer.addEventListener('keydown', e => {
    if (e.key !== 'ArrowLeft' && e.key !== 'ArrowRight') return;
    e.preventDefault();
    const tabs = [...tabsContainer.querySelectorAll('.tr-tab')];
    const idx = tabs.indexOf(e.target);
    if (idx < 0) return;
    const next = e.key === 'ArrowRight'
      ? tabs[(idx + 1) % tabs.length]
      : tabs[(idx - 1 + tabs.length) % tabs.length];
    activateTab(next.dataset.tab);
    next.focus();
  });
  const panel = document.getElementById('trPanel');
  const deleteBtn = document.getElementById('trDeleteBtn');
  const deleteSegmentModal = document.getElementById('trDeleteSegmentModal');
  const deleteSegmentModalBody = document.getElementById('trDeleteSegmentModalBody');
  const deleteSegmentModalConfirm = document.getElementById('trDeleteSegmentModalConfirm');
  const emptyIcons = {
    day: '<svg viewBox="0 0 24 24"><circle cx="12" cy="12" r="10"></circle><polyline points="12 6 12 12 16 14"></polyline></svg>',
    nothing: '<svg viewBox="0 0 24 24"><rect x="3" y="4" width="18" height="18" rx="2" ry="2"></rect><line x1="16" y1="2" x2="16" y2="6"></line><line x1="8" y1="2" x2="8" y2="6"></line><line x1="3" y1="10" x2="21" y2="10"></line></svg>',
    transcript: '<svg viewBox="0 0 24 24"><path d="M14 2H6a2 2 0 0 0-2 2v16a2 2 0 0 0 2 2h12a2 2 0 0 0 2-2V8z"></path><polyline points="14 2 14 8 20 8"></polyline><line x1="16" y1="13" x2="8" y2="13"></line><line x1="16" y1="17" x2="8" y2="17"></line></svg>',
    audio: '<svg viewBox="0 0 24 24"><polygon points="11 5 6 9 2 9 2 15 6 15 11 19 11 5"></polygon><path d="M19.07 4.93a10 10 0 0 1 0 14.14"></path><path d="M15.54 8.46a5 5 0 0 1 0 7.07"></path></svg>',
    screen: '<svg viewBox="0 0 24 24"><rect x="2" y="3" width="20" height="14" rx="2" ry="2"></rect><line x1="8" y1="21" x2="16" y2="21"></line><line x1="12" y1="17" x2="12" y2="21"></line></svg>'
  };

  // State
  let height = timeline.clientHeight;
  let ppm = height / (timelineEnd - timelineStart);
  let range = { start: 9 * 60, end: 10 * 60 };
  let drag = null;
  let allSegments = [];
  let selectedSegment = null;
  let updateNowPosition = null;
  let deleteModalReturnFocus = null;
  let deleteModalPrevOverflow = '';

  // Zoom state
  let zoomHeight = zoom.clientHeight;
  let zoomPpm = 0;

  // Modal state - all screen frames for navigation
  let allScreenFrames = [];
  let currentFrameIndex = -1;

  // ========================================
  // FrameCapture - Client-side thumbnail + on-demand full frame decoder
  // ========================================
  class FrameCapture {
    constructor() {
      // Map of video URL -> { video, ready, width, height, thumbs }
      this.videos = new Map();
      // Pending thumbnail promises per frame
      this.pendingThumbs = new Map();
      this.warnedUrls = new Set();
    }

    // Load video and wait for metadata
    loadVideo(url) {
      if (this.videos.has(url)) {
        const entry = this.videos.get(url);
        if (entry.ready) return Promise.resolve(entry);
        return entry.promise;
      }

      const video = document.createElement('video');
      video.preload = 'metadata';
      video.muted = true;
      video.playsInline = true;
      video.crossOrigin = 'anonymous';

      const promise = new Promise((resolve, reject) => {
        video.onloadedmetadata = () => {
          const entry = this.videos.get(url);
          entry.ready = true;
          entry.width = video.videoWidth;
          entry.height = video.videoHeight;
          resolve(entry);
        };
        video.onerror = () => {
          const mediaError = video.error;
          if (mediaError?.code === MediaError.MEDIA_ERR_SRC_NOT_SUPPORTED) {
            const entry = this.videos.get(url);
            entry.unsupported = true;
            entry.ready = true;
            if (!this.warnedUrls.has(url)) {
              this.warnedUrls.add(url);
              console.warn(`Video format not supported by this browser: ${url}`);
            }
            resolve(entry);
            return;
          }
          reject(new Error(`Failed to load video: ${url}`));
        };
        video.src = url;
      });

      this.videos.set(url, {
        video,
        ready: false,
        unsupported: false,
        width: 0,
        height: 0,
        promise,
        thumbs: new Map(),
        queue: Promise.resolve()
      });
      return promise;
    }

    async _withVideoQueue(videoUrl, task) {
      const entry = await this.loadVideo(videoUrl);
      const run = entry.queue.then(task, task);
      entry.queue = run.catch(() => {});
      return run;
    }

    async _seekTo(video, timestamp) {
      return new Promise((resolve, reject) => {
        const onSeeked = () => {
          video.removeEventListener('seeked', onSeeked);
          video.removeEventListener('error', onError);
          resolve();
        };
        const onError = () => {
          video.removeEventListener('seeked', onSeeked);
          video.removeEventListener('error', onError);
          reject(new Error('Video seek failed'));
        };
        video.addEventListener('seeked', onSeeked);
        video.addEventListener('error', onError);
        video.currentTime = timestamp;
      });
    }

    async captureThumbnail(videoUrl, frameId, width, height) {
      const entry = await this.loadVideo(videoUrl);
      if (entry.unsupported) return null;
      const cacheKey = `${videoUrl}|${frameId}`;

      if (entry.thumbs.has(frameId)) {
        return entry.thumbs.get(frameId);
      }

      if (this.pendingThumbs.has(cacheKey)) {
        return this.pendingThumbs.get(cacheKey);
      }

      const pending = this._withVideoQueue(videoUrl, async () => {
        const video = entry.video;
        const timestamp = Math.max(0, frameId - 1);
        await this._seekTo(video, timestamp);

        let bitmap;
        if (width && height) {
          bitmap = await createImageBitmap(video, {
            resizeWidth: width,
            resizeHeight: height,
            resizeQuality: 'high'
          });
        } else {
          bitmap = await createImageBitmap(video);
        }

        const canvas = document.createElement('canvas');
        canvas.width = width || bitmap.width;
        canvas.height = height || bitmap.height;
        const ctx = canvas.getContext('2d');
        ctx.drawImage(bitmap, 0, 0, canvas.width, canvas.height);
        if (bitmap && typeof bitmap.close === 'function') {
          bitmap.close();
        }
        entry.thumbs.set(frameId, canvas);
        return canvas;
      });

      this.pendingThumbs.set(cacheKey, pending);
      try {
        return await pending;
      } finally {
        this.pendingThumbs.delete(cacheKey);
      }
    }

    async captureFullFrame(videoUrl, frameId) {
      const entry = await this.loadVideo(videoUrl);
      if (entry.unsupported) return null;
      return this._withVideoQueue(videoUrl, async () => {
        const video = entry.video;
        const timestamp = Math.max(0, frameId - 1);
        await this._seekTo(video, timestamp);
        return createImageBitmap(video);
      });
    }

    async prefetchThumbnails(videoUrl, frameIds, onProgress = null, signal = null) {
      if (!frameIds || frameIds.length === 0) return null;

      const sorted = [...new Set(frameIds)].sort((a, b) => a - b);
      for (let i = 0; i < sorted.length; i += 1) {
        if (signal?.aborted) return this.videos.get(videoUrl);
        const frameId = sorted[i];
        await this.captureThumbnail(videoUrl, frameId, 120, 68);
        if (onProgress) onProgress(i + 1, sorted.length);
      }

      return this.videos.get(videoUrl);
    }

    // Clear all loaded videos and cached thumbnails
    clear() {
      for (const entry of this.videos.values()) {
        entry.thumbs.clear();
        entry.video.src = '';
        entry.video.load();
      }
      this.videos.clear();
      this.pendingThumbs.clear();
      this.warnedUrls.clear();
    }

    _drawUnsupportedPlaceholder(canvas, width, height) {
      canvas.width = width;
      canvas.height = height;

      const ctx = canvas.getContext('2d');
      ctx.fillStyle = '#f3f4f6';
      ctx.fillRect(0, 0, width, height);

      const minDim = Math.min(width, height);
      const iconWidth = minDim * 0.42;
      const iconHeight = iconWidth * 0.68;
      const radius = Math.max(4, iconWidth * 0.08);
      const strokeWidth = Math.max(2, minDim * 0.03);
      const standHeight = Math.max(6, iconHeight * 0.22);
      const textSize = Math.max(10, Math.min(height > 120 ? 24 : 14, width / (height > 120 ? 9 : 12)));
      const gap = Math.max(10, height * 0.06);
      const totalHeight = iconHeight + standHeight + gap + textSize;
      const iconX = (width - iconWidth) / 2;
      const iconY = Math.max(height * 0.14, (height - totalHeight) / 2);

      ctx.strokeStyle = '#9ca3af';
      ctx.lineWidth = strokeWidth;
      ctx.lineCap = 'round';
      ctx.lineJoin = 'round';

      ctx.beginPath();
      ctx.moveTo(iconX + radius, iconY);
      ctx.lineTo(iconX + iconWidth - radius, iconY);
      ctx.quadraticCurveTo(iconX + iconWidth, iconY, iconX + iconWidth, iconY + radius);
      ctx.lineTo(iconX + iconWidth, iconY + iconHeight - radius);
      ctx.quadraticCurveTo(iconX + iconWidth, iconY + iconHeight, iconX + iconWidth - radius, iconY + iconHeight);
      ctx.lineTo(iconX + radius, iconY + iconHeight);
      ctx.quadraticCurveTo(iconX, iconY + iconHeight, iconX, iconY + iconHeight - radius);
      ctx.lineTo(iconX, iconY + radius);
      ctx.quadraticCurveTo(iconX, iconY, iconX + radius, iconY);
      ctx.stroke();

      const standY = iconY + iconHeight + standHeight * 0.45;
      const standWidth = iconWidth * 0.28;
      ctx.beginPath();
      ctx.moveTo(width / 2, iconY + iconHeight);
      ctx.lineTo(width / 2, standY);
      ctx.moveTo(width / 2 - standWidth / 2, standY);
      ctx.lineTo(width / 2 + standWidth / 2, standY);
      ctx.stroke();

      ctx.beginPath();
      ctx.moveTo(iconX + iconWidth * 0.18, iconY + iconHeight * 0.2);
      ctx.lineTo(iconX + iconWidth * 0.82, iconY + iconHeight * 0.84);
      ctx.stroke();

      ctx.fillStyle = '#6b7280';
      ctx.font = `${textSize}px sans-serif`;
      ctx.textAlign = 'center';
      ctx.textBaseline = 'top';
      ctx.fillText('Format not supported', width / 2, standY + gap * 0.55);

      canvas.classList.remove('loading');
    }

    // Draw thumbnail to canvas (no overlays - those are only for full frame view)
    async drawThumbnail(canvas, videoUrl, frameId, options = {}) {
      const { width, height } = options;

      try {
        const thumb = await this.captureThumbnail(videoUrl, frameId, width, height);
        if (!thumb) {
          this._drawUnsupportedPlaceholder(canvas, width || 120, height || 68);
          return false;
        }

        canvas.width = width || thumb.width;
        canvas.height = height || thumb.height;

        const ctx = canvas.getContext('2d');
        ctx.drawImage(thumb, 0, 0, canvas.width, canvas.height);

        canvas.classList.remove('loading');
        return true;
      } catch (err) {
        canvas.classList.remove('loading');
        console.warn('Thumbnail draw failed:', err);
        return false;
      }
    }

    // Draw full-resolution frame to canvas (no caching)
    async drawFull(canvas, videoUrl, frameId, options = {}) {
      const { boxCoords, participants, aruco } = options;

      try {
        const bitmap = await this.captureFullFrame(videoUrl, frameId);
        if (!bitmap) {
          this._drawUnsupportedPlaceholder(canvas, 640, 360);
          return false;
        }

        canvas.width = bitmap.width;
        canvas.height = bitmap.height;

        const ctx = canvas.getContext('2d');
        ctx.drawImage(bitmap, 0, 0, canvas.width, canvas.height);

        this._applyOverlays(ctx, canvas, bitmap.width, bitmap.height, { boxCoords, participants, aruco });

        if (bitmap && typeof bitmap.close === 'function') {
          bitmap.close();
        }
        canvas.classList.remove('loading');
        return true;
      } catch (err) {
        canvas.classList.remove('loading');
        console.warn('Full frame draw failed:', err);
        return false;
      }
    }

    // Compute mask polygon from ArUco corner tag markers
    // Corner tag IDs: 6=TL, 7=TR, 2=BR, 4=BL
    // Each marker has corners in order [TL, TR, BR, BL]
    _computeArucoMaskPolygon(aruco) {
      if (!aruco || !aruco.masked || !aruco.markers) return null;

      const cornerTagIds = { 6: 0, 7: 1, 2: 2, 4: 3 }; // id -> which corner to use
      const tagCorners = {};

      for (const marker of aruco.markers) {
        if (marker.id in cornerTagIds && marker.corners?.length === 4) {
          const cornerIdx = cornerTagIds[marker.id];
          tagCorners[marker.id] = marker.corners[cornerIdx];
        }
      }

      // Need all 4 corner tags
      if (!(6 in tagCorners && 7 in tagCorners && 2 in tagCorners && 4 in tagCorners)) {
        return null;
      }

      // Return polygon: TL, TR, BR, BL
      return [tagCorners[6], tagCorners[7], tagCorners[2], tagCorners[4]];
    }

    _applyOverlays(ctx, canvas, sourceWidth, sourceHeight, options = {}) {
      const { boxCoords, participants, aruco } = options;
      const scaleX = canvas.width / sourceWidth;
      const scaleY = canvas.height / sourceHeight;

      // Apply ArUco mask first (so other overlays draw on top)
      const maskPolygon = this._computeArucoMaskPolygon(aruco);
      if (maskPolygon) {
        ctx.fillStyle = '#000000';
        ctx.beginPath();
        ctx.moveTo(maskPolygon[0][0] * scaleX, maskPolygon[0][1] * scaleY);
        for (let i = 1; i < maskPolygon.length; i++) {
          ctx.lineTo(maskPolygon[i][0] * scaleX, maskPolygon[i][1] * scaleY);
        }
        ctx.closePath();
        ctx.fill();
      }

      if (boxCoords && boxCoords.length === 4) {
        const [xMin, yMin, xMax, yMax] = boxCoords;
        ctx.strokeStyle = '#ef4444';
        ctx.lineWidth = 3;
        ctx.strokeRect(
          xMin * scaleX,
          yMin * scaleY,
          (xMax - xMin) * scaleX,
          (yMax - yMin) * scaleY
        );
      }

      if (participants && participants.length > 0) {
        for (const p of participants) {
          const x = (p.left / 100) * canvas.width;
          const y = (p.top / 100) * canvas.height;
          const w = (p.width / 100) * canvas.width;
          const h = (p.height / 100) * canvas.height;

          const colors = {
            speaking: '#fbbf24',
            active: '#4ade80',
            muted: '#f87171',
            presenting: '#60a5fa',
            unknown: '#9ca3af'
          };
          ctx.strokeStyle = colors[p.status] || colors.unknown;
          ctx.lineWidth = 2;
          ctx.setLineDash([5, 5]);
          ctx.strokeRect(x, y, w, h);
          ctx.setLineDash([]);

          const labelY = y + h + 16;
          ctx.font = '11px system-ui, sans-serif';
          const textWidth = ctx.measureText(p.name).width;
          ctx.fillStyle = colors[p.status] || colors.unknown;
          ctx.fillRect(x, y + h + 2, textWidth + 8, 16);

          ctx.fillStyle = '#000';
          ctx.fillText(p.name, x + 4, labelY - 3);
        }
      }
    }
  }

  // Global frame capture instance
  let frameCapture = new FrameCapture();

  // Utilities
  const y = (m) => (m - timelineStart) * ppm;
  const mFromY = (py) => Math.max(timelineStart, Math.min(timelineEnd, Math.round(py / ppm) + timelineStart));
  const snap = (m) => Math.round(m / STEP) * STEP;
  const hhmm = (m) => String(Math.floor(m / 60)).padStart(2, '0') + ':' + String(m % 60).padStart(2, '0');

  // Zoom utilities - map minutes to pixels within the zoomed range
  const zoomY = (m) => (m - range.start) * zoomPpm;

  function parseTime(timeStr) {
    const [hh, mm] = timeStr.split(':').map(Number);
    return hh * 60 + mm;
  }

  // Format cost in cents with exact USD in title
  // Returns {text: "3c", title: "$0.0312"} or {text: "", title: ""} if null/zero
  function formatCost(costUSD) {
    if (costUSD === null || costUSD === undefined) {
      return { text: '', title: '' };
    }
    const cents = Math.round(costUSD * 100);
    const exactUSD = '$' + costUSD.toFixed(4);
    return { text: cents + 'c', title: exactUSD };
  }

  // Format bytes as human-readable size (KB, MB, GB)
  function formatSize(bytes) {
    if (!bytes) return '';
    if (bytes < 1024) return bytes + ' B';
    if (bytes < 1024 * 1024) return (bytes / 1024).toFixed(0) + ' KB';
    if (bytes < 1024 * 1024 * 1024) return (bytes / (1024 * 1024)).toFixed(1) + ' MB';
    return (bytes / (1024 * 1024 * 1024)).toFixed(2) + ' GB';
  }

  // Build range text with cost and total media size
  function updateRangeText() {
    if (!selectedSegment || !segmentData) return;
    const seg = selectedSegment;
    let parts = [`${seg.start} - ${seg.end}`];

    const costInfo = formatCost(segmentData.cost);
    if (costInfo.text) {
      parts.push(`<span title="${costInfo.title}">${costInfo.text}</span>`);
    }

    const sizes = segmentData.media_sizes;
    if (sizes) {
      let total = 0;
      const breakdown = [];
      if (sizes.audio) {
        total += sizes.audio;
        breakdown.push('audio ' + formatSize(sizes.audio));
      }
      if (sizes.screen) {
        total += sizes.screen;
        breakdown.push('screen ' + formatSize(sizes.screen));
      }
      if (total) {
        const title = breakdown.join(', ');
        parts.push(`<span title="${title}">${formatSize(total)}</span>`);
      }
    }

    rangeText.innerHTML = parts.join(' · ');
  }

  function computeTimelineBounds(ranges) {
    // Compute dynamic timeline bounds from content ranges
    // Returns {start, end} in minutes, snapped to hours
    const allRanges = [...(ranges.audio || []), ...(ranges.screen || [])];

    if (allRanges.length === 0) {
      return { start: DEFAULT_START, end: DEFAULT_END };
    }

    // Find min/max times across all ranges
    let minTime = Infinity;
    let maxTime = -Infinity;
    for (const rg of allRanges) {
      const s = parseTime(rg.start);
      const e = parseTime(rg.end);
      if (s < minTime) minTime = s;
      if (e > maxTime) maxTime = e;
    }

    // Add buffer and snap to hours
    let start = Math.floor((minTime - BUFFER) / 60) * 60;
    let end = Math.ceil((maxTime + BUFFER) / 60) * 60;

    // Enforce minimum span - extend end if needed
    if (end - start < MIN_SPAN) {
      end = start + MIN_SPAN;
    }

    // Clamp to valid day range (0:00 - 24:00)
    start = Math.max(0, start);
    end = Math.min(24 * 60, end);

    return { start, end };
  }

  function addSegmentIndicator(type, startMin, endMin, column, streams = []) {
    const el = document.createElement('div');
    el.className = 'tr-seg ' + (type === 'screen' ? 'tr-seg-screen' : 'tr-seg-audio');
    el.style.top = y(startMin) + 'px';
    el.style.height = Math.max(2, y(endMin) - y(startMin)) + 'px';
    el.classList.add(column === 1 ? 'tr-seg-col-1' : 'tr-seg-col-0');
    // Zero-padded HH:MM label
    const _h = Math.floor(startMin / 60);
    const _m = startMin % 60;
    const _label = `Segment ${String(_h).padStart(2, '0')}:${String(_m).padStart(2, '0')}`;
    el.setAttribute('role', 'button');
    el.setAttribute('tabindex', '0');
    el.setAttribute('aria-label', _label);
    const sortedStreams = [...streams].sort();
    const streamHead = sortedStreams.slice(0, 3).join(' + ');
    const streamToken = sortedStreams.length > 3 ? streamHead + ' +' + (sortedStreams.length - 3) : streamHead;
    const streamSuffix = sortedStreams.length ? ' · ' + streamToken : '';
    el.title = hhmm(startMin) + ' – ' + hhmm(endMin) + ' (' + (endMin - startMin) + ' min, ' + type + streamSuffix + ')';
    el.addEventListener('click', e => {
      e.stopPropagation();
      const midMin = (startMin + endMin) / 2;
      const start = snap(midMin - DEFAULT_LEN / 2);
      range = { start, end: start + DEFAULT_LEN };
      renderTimeline();
      updateZoom();
    });
    el.addEventListener('keydown', e => {
      if (e.key === 'Enter' || e.key === ' ') {
        e.preventDefault();
        const midMin = (startMin + endMin) / 2;
        const start = snap(midMin - DEFAULT_LEN / 2);
        range = { start, end: start + DEFAULT_LEN };
        renderTimeline();
        updateZoom();
      }
    });
    segmentsLane.appendChild(el);
  }

  function buildGrid() {
    grid.innerHTML = '';
    labels.innerHTML = '';

    for (let h = timelineStart / 60; h <= timelineEnd / 60; h++) {
      const hourLine = document.createElement('div');
      hourLine.className = 'tr-grid-hour';
      hourLine.style.top = y(h * 60) + 'px';
      grid.appendChild(hourLine);

      const lab = document.createElement('div');
      lab.className = 'tr-label';
      lab.style.top = y(h * 60) + 'px';
      lab.textContent = String(h).padStart(2, '0') + ':00';
      labels.appendChild(lab);

      if (h < timelineEnd / 60) {
        [15, 30, 45].forEach(m => {
          const q = document.createElement('div');
          q.className = 'tr-grid-quarter';
          q.style.top = y(h * 60 + m) + 'px';
          grid.appendChild(q);
        });
      }
    }
  }

  function renderTimeline() {
    selWrap.style.top = y(range.start) + 'px';
    selWrap.style.height = (y(range.end) - y(range.start)) + 'px';
  }

  function buildZoomGrid() {
    zoomGrid.innerHTML = '';
    zoomLabels.innerHTML = '';

    const rangeLen = range.end - range.start;
    // Determine label interval based on range length
    let labelInterval = 5; // default 5 min
    if (rangeLen > 120) labelInterval = 15;
    else if (rangeLen > 60) labelInterval = 10;

    for (let m = range.start; m <= range.end; m++) {
      const yPos = zoomY(m);

      if (m % 60 === 0) {
        const line = document.createElement('div');
        line.className = 'tr-grid-hour';
        line.style.top = yPos + 'px';
        zoomGrid.appendChild(line);
      } else if (m % 15 === 0) {
        const line = document.createElement('div');
        line.className = 'tr-grid-quarter';
        line.style.top = yPos + 'px';
        zoomGrid.appendChild(line);
      }

      if (m % labelInterval === 0) {
        const lab = document.createElement('div');
        lab.className = 'tr-zoom-label';
        lab.style.top = yPos + 'px';
        lab.textContent = hhmm(m);
        zoomLabels.appendChild(lab);
      }
    }
  }

  function filterSegmentsInRange() {
    return allSegments.filter(seg => {
      const segStart = parseTime(seg.start);
      const segEnd = parseTime(seg.end);
      return segEnd > range.start && segStart < range.end;
    });
  }

  function buildZoomSegments() {
    const filtered = filterSegmentsInRange();
    const streams = [...new Set(filtered.map(s => s.stream))].sort();
    const colCount = streams.length;
    zoomSegments.innerHTML = '';

    if (filtered.length === 0) {
      zoomSegments.innerHTML = window.SurfaceState.empty({
        icon: emptyIcons.nothing,
        heading: 'no segments in this range',
        desc: 'widen the time range or pick a different day'
      });
      return;
    }

    filtered.forEach(seg => {
      const segStart = parseTime(seg.start);
      const segEnd = parseTime(seg.end);

      // Clamp to visible range
      const visStart = Math.max(segStart, range.start);
      const visEnd = Math.min(segEnd, range.end);

      const pill = document.createElement('div');
      pill.className = 'tr-zoom-pill';
      pill.setAttribute('role', 'button');
      pill.setAttribute('tabindex', '0');

      if (colCount > 1) {
        const colIdx = streams.indexOf(seg.stream);
        const colWidth = 100 / colCount;
        const gap = 0.5;
        pill.style.left = (colIdx * colWidth + gap / 2) + '%';
        pill.style.right = 'auto';
        pill.style.width = (colWidth - gap) + '%';
      }

      // Determine pill type based on content
      const hasAudio = seg.types.includes('audio');
      const hasScreen = seg.types.includes('screen');
      if (hasAudio && hasScreen) {
        pill.classList.add('tr-zoom-pill-both');
      } else if (hasAudio) {
        pill.classList.add('tr-zoom-pill-audio');
      } else {
        pill.classList.add('tr-zoom-pill-screen');
      }
      const typeLabel = (hasAudio && hasScreen) ? 'audio and screen' : hasAudio ? 'audio' : 'screen';

      if (selectedSegment && selectedSegment.key === seg.key) {
        pill.classList.add('tr-active');
      }

      pill.style.top = zoomY(visStart) + 'px';
      pill.style.height = Math.max(4, zoomY(visEnd) - zoomY(visStart)) + 'px';
      const duration = Math.round(visEnd - visStart);
      const typeDesc = (hasAudio && hasScreen) ? 'audio + screen' : hasAudio ? 'audio' : 'screen';
      pill.title = seg.start + ' – ' + seg.end + ' · ' + duration + ' min · ' + typeDesc + ' · ' + seg.stream;
      pill.setAttribute('aria-label', 'Segment ' + seg.start + ' \u2013 ' + seg.end + ', ' + typeLabel + ', ' + seg.stream);
      pill.dataset.key = seg.key;

      pill.addEventListener('click', () => selectSegment(seg));
      pill.addEventListener('keydown', e => {
        if (e.key === 'Enter' || e.key === ' ') {
          e.preventDefault();
          selectSegment(seg);
        }
      });
      zoomSegments.appendChild(pill);
    });
  }

  function selectSegment(seg, updateHash = true, requestedTabId = null) {
    selectedSegment = seg;

    // Update URL hash for shareable links
    if (updateHash) {
      const tab = activeTab || 'transcript';
      history.replaceState(null, '', `#${seg.key}/${tab}`);
    }

    // Update active state in zoom view
    zoomSegments.querySelectorAll('.tr-zoom-pill').forEach(pill => {
      pill.classList.toggle('tr-active', pill.dataset.key === seg.key);
    });

    titleEl.textContent = seg.stream;
    rangeText.textContent = `${seg.start} - ${seg.end}`;

    // Show delete button when segment is selected
    deleteBtn.classList.add('visible');

    // Load transcript content
    loadSegmentContent(seg, requestedTabId);
  }

  // Step through segments with [ ] keys
  function navigateSegment(delta) {
    if (allSegments.length === 0) return;
    let currentIdx = selectedSegment
      ? allSegments.findIndex(s => s.key === selectedSegment.key)
      : -1;
    let nextIdx = currentIdx === -1
      ? (delta > 0 ? 0 : allSegments.length - 1)
      : currentIdx + delta;
    if (nextIdx < 0 || nextIdx >= allSegments.length) return;
    const seg = allSegments[nextIdx];
    const segStart = parseTime(seg.start);
    const segEnd = parseTime(seg.end);
    if (segStart < range.start || segEnd > range.end) {
      const rangeLen = range.end - range.start;
      const segMid = (segStart + segEnd) / 2;
      let newStart = snap(Math.max(timelineStart, segMid - rangeLen / 2));
      newStart = Math.min(newStart, timelineEnd - rangeLen);
      range = { start: newStart, end: newStart + rangeLen };
      renderTimeline();
      updateZoom();
    }
    selectSegment(seg);
  }

  // Unified timeline state
  let segmentData = null;
  let currentVideoFiles = {}; // filename -> video URL mapping
  let groupEntriesByIdx = new Map();
  let activeTab = null;
  let currentSegmentAbort = null;
  let tabPanes = {}; // tabId -> pane element
  let screenDecoded = false;

  function loadSegmentContent(seg, requestedTabId = null) {
    currentSegmentAbort?.abort();
    currentSegmentAbort = new AbortController();
    const signal = currentSegmentAbort.signal;
    const segmentToken = seg.key;

    // Clear old data, videos, tabs, and show loading message immediately
    segmentData = null;
    currentVideoFiles = {};
    tabPanes = {};
    activeTab = null;
    screenDecoded = false;
    frameCapture.clear();
    tabsContainer.classList.remove('visible');
    tabsContainer.innerHTML = '';
    document.getElementById('trWarningNotice').classList.remove('visible');
    panel.innerHTML = window.SurfaceState.loading({ text: 'Loading segment...' });
    panel.classList.add('loading');

    fetch(`/app/transcripts/api/segment/${day}/${seg.stream}/${seg.key}`, { signal })
      .then(r => r.json())
      .then(data => {
        if (!selectedSegment || selectedSegment.key !== segmentToken) {
          return;
        }
        panel.classList.remove('loading');
        segmentData = data;
        updateRangeText();
        buildTabBar(data);
        activateTab('transcript');
        if (
          requestedTabId
          && [...tabsContainer.querySelectorAll('.tr-tab')].some(
            tab => tab.dataset.tab === requestedTabId
          )
        ) {
          activateTab(requestedTabId);
        }
        const warningNotice = document.getElementById('trWarningNotice');
        if (data.warnings > 0) {
          document.getElementById('trWarningText').textContent = data.warnings + ' warning' + (data.warnings === 1 ? '' : 's') + ' during processing';
          warningNotice.classList.add('visible');
        } else {
          warningNotice.classList.remove('visible');
        }
      })
      .catch(err => {
        if (err.name === 'AbortError') {
          return;
        }
        if (!selectedSegment || selectedSegment.key !== segmentToken) {
          return;
        }
        panel.classList.remove('loading');
        tabsContainer.classList.remove('visible');
        tabsContainer.innerHTML = '';
        panel.innerHTML = window.SurfaceState.error({
          icon: emptyIcons.transcript,
          heading: 'couldn\'t load this segment',
          desc: 'something went wrong loading the transcript. try selecting the segment again, or refresh the page.'
        });
      });
  }

  function prepareScreenFrames(data, targetEl, segmentToken, signal) {
    if (screenDecoded) {
      return Promise.resolve();
    }

    const isStaleSegment = () => !selectedSegment || selectedSegment.key !== segmentToken;
    if (isStaleSegment()) {
      return Promise.resolve();
    }

    currentVideoFiles = data.video_files || {};

    const nonBasicByVideo = new Map();
    (data.chunks || []).forEach(chunk => {
      if (chunk.type !== 'screen') return;
      if (chunk.basic === true) return;
      const filename = chunk.source_ref?.filename;
      const frameId = chunk.source_ref?.frame_id;
      if (!filename || !frameId) return;
      if (!nonBasicByVideo.has(filename)) {
        nonBasicByVideo.set(filename, new Set());
      }
      nonBasicByVideo.get(filename).add(frameId);
    });

    const totalFrames = Array.from(nonBasicByVideo.values()).reduce(
      (sum, frames) => sum + frames.size,
      0
    );
    const perVideoProgress = new Map();
    let lastStatusUpdate = 0;

    const updateLoadingStatus = (done) => {
      if (isStaleSegment()) return;
      const statusEl = targetEl.querySelector('[data-role="loading-status"]');
      if (!statusEl) return;
      if (!totalFrames) {
        statusEl.textContent = 'loading screen entries...';
        return;
      }
      const decoded = Array.from(perVideoProgress.values()).reduce((sum, count) => sum + count, 0);
      const pct = Math.min(100, Math.round((decoded / totalFrames) * 100));
      statusEl.textContent = done
        ? 'Rendering screen entries...'
        : `Decoding key frames ${decoded}/${totalFrames} (${pct}%)...`;
    };

    const makeProgressHandler = (videoUrl) => (count) => {
      if (isStaleSegment()) return;
      const now = Date.now();
      perVideoProgress.set(videoUrl, count);
      if (now - lastStatusUpdate > 150) {
        lastStatusUpdate = now;
        updateLoadingStatus(false);
      }
    };

    updateLoadingStatus(false);

    const decodeJobs = [];
    Object.entries(currentVideoFiles).forEach(([filename, url]) => {
      const frameIds = Array.from(nonBasicByVideo.get(filename) || []);
      if (frameIds.length > 0) {
        decodeJobs.push(
          frameCapture.prefetchThumbnails(
            url,
            frameIds,
            makeProgressHandler(url),
            signal
          )
        );
      }
    });

    if (decodeJobs.length === 0) {
      screenDecoded = true;
      return Promise.resolve();
    }

    return Promise.all(decodeJobs)
      .then(() => {
        if (isStaleSegment()) return;
        screenDecoded = true;
        updateLoadingStatus(true);
      })
      .catch(() => {
        if (isStaleSegment()) return;
        screenDecoded = true;
        updateLoadingStatus(true);
      });
  }

  function buildTabBar(data) {
    tabsContainer.innerHTML = '';
    tabsContainer.setAttribute('role', 'tablist');
    tabsContainer.classList.remove('visible');
    panel.innerHTML = '';
    tabPanes = {};
    activeTab = null;
    screenDecoded = false;

    const addTab = (tabId, label) => {
      const btn = document.createElement('button');
      btn.type = 'button';
      btn.className = 'tr-tab';
      btn.dataset.tab = tabId;
      btn.textContent = label;
      btn.setAttribute('role', 'tab');
      btn.id = 'tr-tab-' + tabId;
      btn.setAttribute('aria-selected', 'false');
      btn.setAttribute('aria-controls', 'tr-tabpanel-' + tabId);
      btn.setAttribute('tabindex', '-1');
      btn.addEventListener('click', () => activateTab(tabId));
      tabsContainer.appendChild(btn);
    };

    addTab('transcript', 'transcript');
    if (data.audio_file) {
      addTab('audio', 'audio');
    }
    if ((data.chunks || []).some(chunk => chunk.type === 'screen')) {
      addTab('screen', 'screen');
    }

    const mdStems = Object.keys(data.md_files || {}).sort((a, b) => a.localeCompare(b));
    mdStems.forEach(stem => addTab(`md-${stem}`, stem));

    tabsContainer.classList.add('visible');
  }

  function activateTab(tabId) {
    if (!segmentData || tabId === activeTab) {
      return;
    }

    tabsContainer.querySelectorAll('.tr-tab').forEach(tab => {
      const isActive = tab.dataset.tab === tabId;
      tab.classList.toggle('active', isActive);
      tab.setAttribute('aria-selected', String(isActive));
      tab.setAttribute('tabindex', isActive ? '0' : '-1');
    });

    Object.values(tabPanes).forEach(pane => pane.classList.remove('active'));

    let pane = tabPanes[tabId];
    if (!pane) {
      pane = document.createElement('div');
      pane.className = 'tr-tab-pane';
      pane.dataset.tab = tabId;
      pane.setAttribute('role', 'tabpanel');
      pane.setAttribute('tabindex', '0');
      pane.id = 'tr-tabpanel-' + tabId;
      pane.setAttribute('aria-labelledby', 'tr-tab-' + tabId);
      panel.appendChild(pane);
      tabPanes[tabId] = pane;

      if (tabId === 'transcript') {
        renderSegmentTimeline(segmentData, true, true, pane);
      } else if (tabId === 'audio') {
        renderSegmentTimeline(segmentData, true, false, pane);
      } else if (tabId === 'screen') {
        const segmentToken = selectedSegment?.key;
        pane.innerHTML = window.SurfaceState.loading({ text: 'Loading screen entries...' });
        prepareScreenFrames(
          segmentData,
          pane,
          segmentToken,
          currentSegmentAbort?.signal
        )
          .then(() => {
            if (!selectedSegment || selectedSegment.key !== segmentToken) {
              return;
            }
            if (tabPanes[tabId] !== pane) {
              return;
            }
            renderSegmentTimeline(segmentData, false, true, pane);
          })
          .catch(() => {
            if (!selectedSegment || selectedSegment.key !== segmentToken) {
              return;
            }
            if (tabPanes[tabId] !== pane) {
              return;
            }
            pane.innerHTML = window.SurfaceState.error({
              icon: emptyIcons.screen,
              heading: 'couldn\'t load screen entries',
              desc: 'something went wrong decoding the screen data. try selecting the segment again.'
            });
          });
      } else if (tabId.startsWith('md-')) {
        const stem = tabId.slice(3);
        const content = (segmentData.md_files || {})[stem] || '';
        pane.innerHTML = `<div class="tr-md-content">${window.AppServices.renderMarkdown(content)}</div>`;
      }
    }

    pane.classList.add('active');
    activeTab = tabId;
    if (selectedSegment) {
      history.replaceState(null, '', `#${selectedSegment.key}/${tabId}`);
    }
  }

  function renderSegmentTimeline(data, showAudio, showScreen, targetEl) {
    const chunks = (data.chunks || []).filter(c => {
      if (c.type === 'audio' && !showAudio) return false;
      if (c.type === 'screen' && !showScreen) return false;
      return true;
    });

    const textOnlyScreen = showScreen && Object.keys(currentVideoFiles).length === 0;

    // Build flat list of all screen frames for modal navigation
    allScreenFrames = chunks.filter(c => c.type === 'screen');
    currentFrameIndex = -1;

    if (chunks.length === 0) {
      const tabType = !showScreen ? 'audio' : !showAudio ? 'screen' : 'transcript';
      const tabEmptyMap = {
        transcript: { icon: emptyIcons.transcript, heading: 'no transcript entries', desc: 'this segment has no transcript content' },
        audio: { icon: emptyIcons.audio, heading: 'no audio entries', desc: 'this segment has no audio content' },
        screen: { icon: emptyIcons.screen, heading: 'no screen entries', desc: 'this segment has no screen observations' }
      };
      const emptyInfo = tabEmptyMap[tabType] || tabEmptyMap.transcript;
      targetEl.innerHTML = window.SurfaceState.empty(emptyInfo);
      return;
    }

    // Group sequential basic screen frames together
    const displayItems = textOnlyScreen ? chunks : groupBasicScreenFrames(chunks);
    groupEntriesByIdx = new Map();

    let html = `<div class="tr-unified" role="list" aria-label="transcript entries, ${displayItems.length} items">`;

    // Audio player section (if we have audio)
    if (data.audio_file && showAudio) {
      html += '<div class="tr-audio-players" role="presentation">';
      html += '<div class="tr-audio-player">';
      html += '<div class="tr-audio-player-label">segment audio</div>';
      html += `<audio data-role="segment-audio" controls preload="metadata"><source src="${data.audio_file}" type="audio/flac">Your browser does not support audio.</audio>`;
      html += '</div></div>';
    }

    if (data.media_purged && !data.audio_file && showAudio) {
      html += '<div class="tr-purge-notice" role="presentation">Raw observed media removed per retention policy</div>';
    }

    // Render items (chunks or groups)
    displayItems.forEach((item, idx) => {
      if (item.type === 'screen-group') {
        groupEntriesByIdx.set(idx, item.entries || []);
        // Render collapsed group of basic frames
        html += renderScreenGroup(item, idx);
      } else if (item.type === 'audio') {
        const timeStr = item.time || '';
        html += `<div class="tr-entry tr-entry-audio" data-idx="${idx}" data-type="audio" data-timestamp="${item.timestamp}" role="listitem" tabindex="0" aria-label="play from ${timeStr}">`;
        html += `<div class="tr-entry-time">${timeStr}</div>`;
        html += '<div class="tr-entry-content">';
        html += '<span class="sr-only">Audio: </span>';
        if (item.speaker_label) {
          const sl = item.speaker_label;
          const dotClass = sl.confidence === 'high' ? 'tr-speaker-dot-high' : 'tr-speaker-dot-medium';
          const labelClass = sl.is_owner ? 'tr-speaker-label tr-speaker-label-owner' : 'tr-speaker-label';
          const displayName = sl.is_owner ? 'You' : escapeHtml(sl.name);
          const entityHref = '/app/entities#' + encodeURIComponent(sl.entity_id);
          html += `<div class="${labelClass}" aria-label="speaker: ${displayName}, ${sl.confidence} confidence"><span class="tr-speaker-dot ${dotClass}"></span><a href="${entityHref}">${displayName}</a><span class="sr-only">${sl.confidence} confidence</span></div>`;
        }
        html += `<div class="tr-entry-text">${escapeHtml(item.markdown)}</div>`;
        html += '</div></div>';
      } else if (item.type === 'screen') {
        if (textOnlyScreen) {
          const timeStr = item.time || '';
          const markdown = window.AppServices.renderMarkdown(item.markdown) || 'Screen activity';
          html += '<div class="tr-entry" role="listitem">';
          html += `<div class="tr-entry-time">${timeStr}</div>`;
          html += '<div class="tr-entry-content">';
          html += '<span class="sr-only">Screen: </span>';
          html += `<div class="tr-screen-text">${markdown}</div>`;
          html += '</div></div>';
        } else {
          // Enhanced screen frame - render fully
          html += renderEnhancedScreenEntry(item, idx);
        }
      }
    });

    html += '</div>';
    targetEl.innerHTML = html;

    // Get audio element reference
    const paneAudioEl = targetEl.querySelector('audio[data-role="segment-audio"]');

    // Add click handlers for audio entries to seek
    targetEl.querySelectorAll('.tr-entry-audio').forEach(entry => {
      entry.addEventListener('click', () => {
        if (paneAudioEl && segmentData?.audio_file) {
          const timestamp = parseInt(entry.dataset.timestamp, 10);
          const baseTimestamp = chunks[0]?.timestamp || timestamp;
          const offsetSec = (timestamp - baseTimestamp) / 1000;
          paneAudioEl.currentTime = Math.max(0, offsetSec);
          paneAudioEl.play();
        }
      });
    });

    // Add keyboard handler for audio entries
    targetEl.querySelectorAll('.tr-entry-audio').forEach(entry => {
      entry.addEventListener('keydown', e => {
        if (e.key === 'Enter' || e.key === ' ') {
          e.preventDefault();
          entry.click();
        }
      });
    });

    // Playback highlight: track current entry during audio playback
    if (paneAudioEl) {
      const baseTimestamp = chunks[0]?.timestamp || 0;
      let activeEntry = null;

      paneAudioEl.addEventListener('timeupdate', () => {
        const currentMs = baseTimestamp + (paneAudioEl.currentTime * 1000);
        const entries = targetEl.querySelectorAll('.tr-entry-audio[data-timestamp]');
        let best = null;
        for (const el of entries) {
          const ts = parseInt(el.dataset.timestamp, 10);
          if (ts <= currentMs) best = el;
          else break;
        }
        if (best === activeEntry) return;
        if (activeEntry) activeEntry.classList.remove('tr-entry-active');
        activeEntry = best;
        if (activeEntry) {
          activeEntry.classList.add('tr-entry-active');
          activeEntry.scrollIntoView({ behavior: 'smooth', block: 'nearest' });
        }
      });

      paneAudioEl.addEventListener('ended', () => {
        if (activeEntry) {
          activeEntry.classList.remove('tr-entry-active');
          activeEntry = null;
        }
      });
    }

    // Add click handlers for enhanced screen entries to open modal
    targetEl.querySelectorAll('.tr-entry-screen').forEach(entry => {
      const thumb = entry.querySelector('.tr-entry-thumb');
      if (thumb) {
        thumb.addEventListener('click', (e) => {
          e.stopPropagation();
          const frameIdx = parseInt(entry.dataset.frameIdx, 10);
          if (!isNaN(frameIdx)) openImageModal(frameIdx);
        });
      }
    });

    // Add click handlers for group headers to expand/collapse
    targetEl.querySelectorAll('.tr-group-header').forEach(header => {
      header.addEventListener('click', () => {
        const groupEl = header.parentElement;
        const isExpanded = groupEl.classList.toggle('expanded');
        header.setAttribute('aria-expanded', String(isExpanded));
        if (!isExpanded) return;
        if (groupEl.dataset.prefetched === 'true') return;
        const groupIdx = parseInt(groupEl.dataset.idx, 10);
        if (isNaN(groupIdx)) return;
        const entries = groupEntriesByIdx.get(groupIdx) || [];
        prefetchGroupThumbnails(
          entries,
          groupEl,
          targetEl,
          currentSegmentAbort?.signal
        );
      });
      header.addEventListener('keydown', e => {
        if (e.key === 'Enter' || e.key === ' ') {
          e.preventDefault();
          header.click();
        }
      });
    });

    // Add click handlers for group grid items to open modal
    targetEl.querySelectorAll('.tr-group-item').forEach(item => {
      item.addEventListener('click', () => {
        const frameIdx = parseInt(item.dataset.frameIdx, 10);
        if (!isNaN(frameIdx)) openImageModal(frameIdx);
      });
      item.addEventListener('keydown', e => {
        if (e.key === 'Enter' || e.key === ' ') {
          e.preventDefault();
          item.click();
        }
      });
    });

    // Set up lazy loading for canvas thumbnails using IntersectionObserver
    if (!textOnlyScreen) {
      setupLazyCanvasLoading(targetEl);
    }
  }

  function prefetchGroupThumbnails(entries, groupEl, targetEl, signal) {
    const frameIdsByVideo = new Map();
    for (const entry of entries) {
      const filename = entry.source_ref?.filename;
      const frameId = entry.source_ref?.frame_id;
      if (!filename || !frameId) continue;
      if (!frameIdsByVideo.has(filename)) {
        frameIdsByVideo.set(filename, new Set());
      }
      frameIdsByVideo.get(filename).add(frameId);
    }

    const jobs = [];
    for (const [filename, frameIds] of frameIdsByVideo.entries()) {
      const url = currentVideoFiles[filename];
      if (!url) continue;
      jobs.push(
        frameCapture.prefetchThumbnails(url, Array.from(frameIds), null, signal)
      );
    }

    if (jobs.length > 0) {
      groupEl.dataset.prefetched = 'true';
      Promise.all(jobs).finally(() => {
        setupLazyCanvasLoading(targetEl);
      });
    }
  }

  // Lazy load canvas thumbnails when they become visible
  function setupLazyCanvasLoading(targetEl = panel) {
    const canvases = targetEl.querySelectorAll('canvas[data-video-url]');
    if (canvases.length === 0) return;

    const observer = new IntersectionObserver((entries) => {
      for (const entry of entries) {
        if (entry.isIntersecting) {
          const canvas = entry.target;
          observer.unobserve(canvas);
          loadCanvasThumbnail(canvas);
        }
      }
    }, { rootMargin: '100px' });

    canvases.forEach(canvas => observer.observe(canvas));
  }

  // Load a single canvas thumbnail
  function loadCanvasThumbnail(canvas) {
    const videoUrl = canvas.dataset.videoUrl;
    const frameId = parseInt(canvas.dataset.frameId, 10);

    if (!videoUrl || isNaN(frameId)) {
      canvas.classList.remove('loading');
      return;
    }

    // Draw at thumbnail size (120x68) - no overlays on thumbnails
    frameCapture.drawThumbnail(canvas, videoUrl, frameId, {
      width: 120,
      height: 68
    });
  }

  function groupBasicScreenFrames(chunks) {
    // Group sequential basic screen frames, keep audio and enhanced screens separate
    const result = [];
    let currentGroup = null;

    for (const chunk of chunks) {
      const isBasicScreen = chunk.type === 'screen' && chunk.basic === true;

      if (isBasicScreen) {
        // Add to current group or start new one
        if (!currentGroup) {
          currentGroup = {
            type: 'screen-group',
            entries: [],
            startTime: chunk.time,
            endTime: chunk.time
          };
        }
        currentGroup.entries.push(chunk);
        currentGroup.endTime = chunk.time;
      } else {
        // Flush any pending group
        if (currentGroup) {
          result.push(currentGroup);
          currentGroup = null;
        }
        result.push(chunk);
      }
    }

    // Flush final group
    if (currentGroup) {
      result.push(currentGroup);
    }

    return result;
  }

  function findFrameIndex(chunk) {
    // Find this chunk's index in allScreenFrames by matching source_ref
    const ref = chunk.source_ref;
    return allScreenFrames.findIndex(f =>
      f.source_ref?.filename === ref?.filename &&
      f.source_ref?.frame_id === ref?.frame_id
    );
  }

  // Get video URL for a chunk
  function getVideoUrlForChunk(chunk) {
    const filename = chunk.source_ref?.filename;
    return filename ? currentVideoFiles[filename] : null;
  }

  function renderScreenGroup(group, idx) {
    const count = group.entries.length;
    const timeRange = group.startTime === group.endTime
      ? group.startTime
      : `${group.startTime} - ${group.endTime}`;
    const countText = count === 1 ? '1 frame' : `${count} frames`;

    let html = `<div class="tr-group" data-idx="${idx}" role="listitem">`;
    html += `<div class="tr-group-header" role="button" tabindex="0" aria-expanded="false" aria-controls="tr-group-grid-${idx}">`;
    html += `<svg class="tr-group-chevron" viewBox="0 0 24 24" fill="none" stroke="currentColor" stroke-width="2"><path d="M9 18l6-6-6-6"/></svg>`;
    html += `<span class="tr-group-time">${timeRange}</span>`;
    html += `<span class="tr-group-count">${countText}</span>`;
    html += '</div>';

    // Grid of thumbnails (hidden until expanded)
    html += `<div class="tr-group-grid" id="tr-group-grid-${idx}">`;
    for (const entry of group.entries) {
      const videoUrl = getVideoUrlForChunk(entry);
      const frameId = entry.source_ref?.frame_id;
      const analysis = entry.source_ref?.analysis || {};
      const category = analysis.primary || 'unknown';
      const description = analysis.visual_description || category;
      const frameIdx = findFrameIndex(entry);

      if (videoUrl && frameId) {
        html += `<div class="tr-group-item" data-frame-idx="${frameIdx}" title="${escapeHtml(description)}" role="button" tabindex="0">`;
        html += `<canvas class="loading" data-video-url="${escapeHtml(videoUrl)}" data-frame-id="${frameId}"></canvas>`;
        html += `<span class="tr-group-item-badge">${escapeHtml(category)}</span>`;
        html += '</div>';
      }
    }
    html += '</div>';

    html += '</div>';
    return html;
  }

  function renderEnhancedScreenEntry(chunk, idx) {
    const timeStr = chunk.time || '';
    const monitor = chunk.source_ref?.monitor || '';
    const videoUrl = getVideoUrlForChunk(chunk);
    const frameId = chunk.source_ref?.frame_id;
    const frameIdx = findFrameIndex(chunk);

    let html = `<div class="tr-entry tr-entry-screen" data-idx="${idx}" data-frame-idx="${frameIdx}" data-type="screen" role="listitem">`;
    html += `<div class="tr-entry-time">${timeStr}</div>`;
    html += '<div class="tr-entry-content">';
    html += '<span class="sr-only">Screen: </span>';

    if (videoUrl && frameId) {
      html += `<canvas class="tr-entry-thumb loading" data-video-url="${escapeHtml(videoUrl)}" data-frame-id="${frameId}"></canvas>`;
    }

    html += '<div class="tr-entry-desc">';
    if (monitor) {
      const monitorPos = getMonitorPosition(monitor);
      if (monitorPos) html += `<span class="tr-entry-badge tr-entry-badge-monitor">${monitorPos}</span>`;
    }
    if (chunk.markdown) {
      html += window.AppServices.renderMarkdown(chunk.markdown);
    }
    html += '</div>';

    html += '</div></div>';
    return html;
  }

  function openImageModal(frameIndex) {
    if (frameIndex < 0 || frameIndex >= allScreenFrames.length) return;

    currentFrameIndex = frameIndex;
    let maskHidden = false; // Track if user has revealed masked content
    const triggerElement = document.activeElement;
    const prevOverflow = document.body.style.overflow;

    const modal = document.createElement('div');
    modal.className = 'tr-screenshot-modal';
    modal.id = 'trImageModal';
    modal.setAttribute('role', 'dialog');
    modal.setAttribute('aria-modal', 'true');
    modal.setAttribute('aria-label', 'Screenshot viewer');

    const drawFrame = (canvas, f, showMask) => {
      const videoUrl = getVideoUrlForChunk(f);
      const frameId = f.source_ref?.frame_id;
      const boxCoords = f.source_ref?.box_2d;
      const aruco = f.source_ref?.aruco;
      const participants = f.source_ref?.participants || [];

      if (videoUrl && frameId) {
        frameCapture.drawFull(canvas, videoUrl, frameId, {
          boxCoords,
          participants,
          aruco: showMask ? aruco : null // Pass null to skip mask
        });
      } else {
        canvas.classList.remove('loading');
      }
    };

    const updateModalContent = () => {
      const f = allScreenFrames[currentFrameIndex];
      const monitor = f.source_ref?.monitor || '';
      const monitorPos = getMonitorPosition(monitor);
      const analysis = f.source_ref?.analysis || {};
      const category = analysis.primary || '';
      const description = analysis.visual_description || '';
      const aruco = f.source_ref?.aruco;
      const isMasked = aruco?.masked && !maskHidden;
      const hasPrev = currentFrameIndex > 0;
      const hasNext = currentFrameIndex < allScreenFrames.length - 1;

      modal.innerHTML = `
        <div class="tr-modal-nav${hasPrev ? '' : ' disabled'}" data-dir="prev" title="previous frame (left arrow)" role="button" tabindex="${hasPrev ? '0' : '-1'}">
          <svg viewBox="0 0 24 24" fill="none" stroke="currentColor" stroke-width="2"><path d="M15 18l-6-6 6-6"/></svg>
        </div>
        <div class="tr-modal-center">
          <div class="tr-modal-header">
            ${monitorPos ? `<span class="tr-modal-badge tr-modal-badge-monitor">${monitorPos}</span>` : ''}
            ${category ? `<span class="tr-modal-badge tr-modal-badge-category">${escapeHtml(category)}</span>` : ''}
            ${isMasked ? '<span class="tr-modal-badge tr-modal-badge-masked" title="click image to reveal">masked</span>' : ''}
            <button class="tr-modal-close" title="close (esc)" aria-label="close">&times;</button>
          </div>
          <div class="tr-modal-img-wrap">
            <canvas id="trModalCanvas" class="loading${isMasked ? ' tr-masked-canvas' : ''}"></canvas>
          </div>
          ${description ? `<div class="tr-modal-description">${escapeHtml(description)}</div>` : ''}
        </div>
        <div class="tr-modal-nav${hasNext ? '' : ' disabled'}" data-dir="next" title="next frame (right arrow)" role="button" tabindex="${hasNext ? '0' : '-1'}">
          <svg viewBox="0 0 24 24" fill="none" stroke="currentColor" stroke-width="2"><path d="M9 18l6-6-6-6"/></svg>
        </div>
      `;

      // Draw frame to modal canvas
      const canvas = modal.querySelector('#trModalCanvas');
      drawFrame(canvas, f, !maskHidden);

      // Add click-to-reveal handler for masked frames
      if (aruco?.masked) {
        canvas.addEventListener('click', () => {
          if (!maskHidden) {
            maskHidden = true;
            canvas.classList.remove('tr-masked-canvas');
            canvas.classList.add('loading');
            modal.querySelector('.tr-modal-badge-masked')?.remove();
            drawFrame(canvas, f, false);
          }
        });
      }
    };

    const navigateFrame = (delta) => {
      const newIndex = currentFrameIndex + delta;
      if (newIndex >= 0 && newIndex < allScreenFrames.length) {
        currentFrameIndex = newIndex;
        maskHidden = false; // Reset mask state when navigating
        updateModalContent();
        modal.querySelector('.tr-modal-close')?.focus();
      }
    };

    const closeModal = () => {
      modal.remove();
      document.removeEventListener('keydown', handleKeys);
      document.body.style.overflow = prevOverflow;
      if (triggerElement && document.contains(triggerElement)) triggerElement.focus();
      currentFrameIndex = -1;
    };

    const handleKeys = (e) => {
      if (e.key === 'Escape') closeModal();
      else if (e.key === 'ArrowLeft') { e.preventDefault(); navigateFrame(-1); }
      else if (e.key === 'ArrowRight') { e.preventDefault(); navigateFrame(1); }
      else if (e.key === 'Tab') {
        const focusable = [...modal.querySelectorAll('button:not([disabled]), [tabindex="0"]')];
        if (focusable.length === 0) return;
        const currentIndex = focusable.indexOf(document.activeElement);
        if (e.shiftKey) {
          e.preventDefault();
          focusable[currentIndex <= 0 ? focusable.length - 1 : currentIndex - 1].focus();
        } else {
          e.preventDefault();
          focusable[currentIndex >= focusable.length - 1 ? 0 : currentIndex + 1].focus();
        }
      }
    };

    // Event delegation for modal clicks
    modal.addEventListener('click', (e) => {
      const target = e.target.closest('.tr-modal-close, .tr-modal-nav:not(.disabled)');
      if (target) {
        if (target.classList.contains('tr-modal-close')) closeModal();
        else if (target.classList.contains('tr-modal-nav')) {
          navigateFrame(target.dataset.dir === 'prev' ? -1 : 1);
        }
      } else if (e.target === modal || e.target.classList.contains('tr-modal-img-wrap')) {
        closeModal();
      }
    });

    document.body.style.overflow = 'hidden';
    document.body.appendChild(modal);
    updateModalContent();
    modal.querySelector('.tr-modal-close')?.focus();
    document.addEventListener('keydown', handleKeys);
  }

  function updateZoom() {
    zoom.setAttribute('aria-label', 'Detail timeline (' + hhmm(range.start) + '\u2013' + hhmm(range.end) + ')');
    zoomHeight = zoom.clientHeight - 24; // account for padding
    const rangeLen = range.end - range.start;
    if (rangeLen > 0) {
      zoomPpm = zoomHeight / rangeLen;
      buildZoomGrid();
      buildZoomSegments();
    }
  }

  // Resize observers
  // Account for 12px padding top and bottom
  const PADDING = 24;

  new ResizeObserver(() => {
    height = timeline.clientHeight - PADDING;
    ppm = height / (timelineEnd - timelineStart);
    buildGrid();
    renderTimeline();
    if (updateNowPosition) updateNowPosition();
  }).observe(timeline);

  new ResizeObserver(() => {
    updateZoom();
  }).observe(zoom);

  // Load combined transcript data
  fetch(`/app/transcripts/api/day/${day}`)
    .then(r => {
      if (!r.ok) throw new Error(`Day data failed: ${r.status}`);
      return r.json();
    })
    .then(data => {
      // Apply dynamic timeline bounds from ranges
      const bounds = computeTimelineBounds(data);
      timelineStart = bounds.start;
      timelineEnd = bounds.end;
      timeline.setAttribute('aria-label', 'Day timeline (' + hhmm(timelineStart) + '\u2013' + hhmm(timelineEnd) + ')');

      // Recalculate pixels-per-minute with new bounds
      height = timeline.clientHeight - PADDING;
      ppm = height / (timelineEnd - timelineStart);

      // Set initial selection range within bounds
      // Center on current time if viewing today, otherwise midpoint
      const now = new Date();
      const todayStr = String(now.getFullYear()) +
        String(now.getMonth() + 1).padStart(2, '0') +
        String(now.getDate()).padStart(2, '0');
      let center;
      if (day === todayStr) {
        const nowMin = now.getHours() * 60 + now.getMinutes();
        center = Math.max(timelineStart, Math.min(timelineEnd, nowMin));
      } else {
        center = (timelineStart + timelineEnd) / 2;
      }
      range = { start: snap(center - DEFAULT_LEN / 2), end: snap(center + DEFAULT_LEN / 2) };
      if (range.start < timelineStart) {
        range = { start: timelineStart, end: timelineStart + DEFAULT_LEN };
      }
      if (range.end > timelineEnd) {
        range = { start: timelineEnd - DEFAULT_LEN, end: timelineEnd };
      }

      // Build the grid and render timeline
      buildGrid();
      renderTimeline();

      // Add segment indicators from ranges
      (data.audio || []).forEach(rg => {
        const s = parseTime(rg.start);
        const e = parseTime(rg.end);
        addSegmentIndicator('audio', s, e, 0, rg.streams);
      });
      (data.screen || []).forEach(rg => {
        const s = parseTime(rg.start);
        const e = parseTime(rg.end);
        addSegmentIndicator('screen', s, e, 1, rg.streams);
      });

      // Now-marker for today
      if (day === todayStr) {
        const marker = document.createElement('div');
        marker.className = 'tr-now-marker';
        marker.setAttribute('aria-label', 'Current time');
        const lbl = document.createElement('span');
        lbl.className = 'tr-now-label';
        lbl.textContent = 'now';
        marker.appendChild(lbl);
        timeline.appendChild(marker);

        updateNowPosition = function() {
          const n = new Date();
          const nowMin = n.getHours() * 60 + n.getMinutes();
          if (nowMin < timelineStart || nowMin > timelineEnd) {
            marker.style.display = 'none';
          } else {
            marker.style.display = '';
            marker.style.top = y(nowMin) + 'px';
          }
        };
        updateNowPosition();
        setInterval(updateNowPosition, 60000);
      }

      // Store segments and update zoom
      allSegments = data.segments || [];
      updateZoom();
      if (allSegments.length === 0) {
        panel.innerHTML = window.SurfaceState.empty({
          icon: emptyIcons.nothing,
          heading: 'nothing here',
          desc: 'no observations were found for this day'
        });
      }

      // Check for hash fragment to auto-select segment
      const rawHash = window.location.hash.slice(1);
      const [segKey, tabIdFromHash] = rawHash.split('/', 2);
      if (segKey) {
        const seg = allSegments.find(s => s.key === segKey);
        if (seg) {
          const segStart = parseTime(seg.start);
          const segEnd = parseTime(seg.end);
          const rangeLen = range.end - range.start;
          const segMid = (segStart + segEnd) / 2;
          let newStart = snap(Math.max(timelineStart, segMid - rangeLen / 2));
          newStart = Math.min(newStart, timelineEnd - rangeLen);
          range = { start: newStart, end: newStart + rangeLen };
          renderTimeline();
          updateZoom();
          selectSegment(seg, false, tabIdFromHash);
        }
      }
    })
    .catch(err => {
      console.error('Failed to load transcript data:', err);
      zoomSegments.innerHTML = '';
      panel.innerHTML = window.SurfaceState.error({
        icon: emptyIcons.transcript,
        heading: 'couldn\'t load transcripts',
        desc: 'the data service may be offline. try refreshing the page.'
      });
    });

  // Handle browser back/forward
  window.addEventListener('hashchange', () => {
    const rawHash = window.location.hash.slice(1);
    const [segKey, tabIdFromHash] = rawHash.split('/', 2);
    if (!segKey) {
      return;
    }

    const seg = allSegments.find(s => s.key === segKey);
    if (!seg) {
      return;
    }

    if (!selectedSegment || selectedSegment.key !== segKey) {
      selectSegment(seg, false, tabIdFromHash);
      return;
    }

    if (
      tabIdFromHash
      && [...tabsContainer.querySelectorAll('.tr-tab')].some(
        tab => tab.dataset.tab === tabIdFromHash
      )
    ) {
      activateTab(tabIdFromHash);
    }
  });

  // Keyboard navigation for segment stepping
  document.addEventListener('keydown', (e) => {
    if (e.key === 'Escape' && deleteSegmentModal.style.display !== 'none') {
      e.preventDefault();
      closeDeleteSegmentModal();
      return;
    }
    const tag = e.target.tagName;
    if (tag === 'INPUT' || tag === 'TEXTAREA' || e.target.isContentEditable) return;
    if (document.getElementById('trImageModal')) return;
    if (deleteSegmentModal.style.display !== 'none') return;
    if (e.key === ']') { e.preventDefault(); navigateSegment(1); }
    else if (e.key === '[') { e.preventDefault(); navigateSegment(-1); }
  });

  window.addEventListener('click', (event) => {
    if (event.target === deleteSegmentModal) {
      closeDeleteSegmentModal();
    }
  });

  // Click on timeline to set range
  timeline.addEventListener('click', (e) => {
    if (e.target.closest('.tr-sel')) return;
    const box = timeline.getBoundingClientRect();
    const py = e.clientY - box.top;
    let mid = snap(mFromY(py));
    let start = Math.max(timelineStart, Math.min(timelineEnd - DEFAULT_LEN, mid - DEFAULT_LEN / 2));
    start = snap(start);
    range = { start, end: snap(start + DEFAULT_LEN) };
    renderTimeline();
    updateZoom();
  });

  // Drag handlers for main selection
  function onPointerMove(ev) {
    if (!drag) return;
    ev.preventDefault();
    const dy = ev.clientY - drag.y0;
    const dMin = Math.round((dy / ppm) / STEP) * STEP;

    if (drag.mode === 'move') {
      const len = drag.r0.end - drag.r0.start;
      let s = drag.r0.start + dMin;
      s = Math.max(timelineStart, Math.min(timelineEnd - len, s));
      s = snap(s);
      range = { start: s, end: snap(s + len) };
    } else if (drag.mode === 'start') {
      let s = drag.r0.start + dMin;
      s = Math.max(timelineStart, Math.min(drag.r0.end - MIN_LEN, s));
      range = { start: snap(s), end: snap(drag.r0.end) };
    } else if (drag.mode === 'end') {
      let e = drag.r0.end + dMin;
      e = Math.min(timelineEnd, Math.max(drag.r0.start + MIN_LEN, e));
      range = { start: snap(drag.r0.start), end: snap(e) };
    }
    renderTimeline();
    updateZoom();
  }

  function onPointerUp() {
    drag = null;
    document.body.classList.remove('tr-dragging');
    window.removeEventListener('pointermove', onPointerMove);
    window.removeEventListener('pointerup', onPointerUp);
  }

  function beginDrag(mode) {
    return (ev) => {
      ev.stopPropagation();
      ev.preventDefault();
      document.body.classList.add('tr-dragging');
      drag = { mode, y0: ev.clientY, r0: { ...range } };
      window.addEventListener('pointermove', onPointerMove);
      window.addEventListener('pointerup', onPointerUp);
    };
  }

  sel.addEventListener('pointerdown', beginDrag('move'));
  sel.querySelector('[data-handle="start"]').addEventListener('pointerdown', beginDrag('start'));
  sel.querySelector('[data-handle="end"]').addEventListener('pointerdown', beginDrag('end'));

  function getMonitorPosition(monitor) {
    if (!monitor) return null;
    // Extract position from monitor string (e.g., "center_DP-3" -> "Center")
    const pos = monitor.split('_')[0];
    if (!pos) return null;
    // Capitalize first letter
    return pos.charAt(0).toUpperCase() + pos.slice(1);
  }

  function showDeleteSegmentModal() {
    if (!selectedSegment) return;

    const seg = selectedSegment;
    const totalBytes = (segmentData?.media_sizes?.audio || 0) + (segmentData?.media_sizes?.screen || 0);
    const sizeLine = totalBytes > 0
      ? `<p class="tr-delete-segment-size">Current raw media size: ${formatSize(totalBytes)}</p>`
      : '';

    deleteSegmentModalBody.innerHTML = `
      <p class="tr-delete-segment-meta"><strong>${escapeHtml(seg.stream)}</strong> · <strong>${escapeHtml(day)}</strong> · <strong>${escapeHtml(seg.start)} - ${escapeHtml(seg.end)}</strong></p>
      <p>You'll have about 10 seconds to undo this after confirming.</p>
      <p>This removes:</p>
      <ul class="tr-delete-segment-list">
        <li>audio</li>
        <li>screen recording</li>
        <li>transcripts</li>
        <li>derived insights</li>
      </ul>
      ${sizeLine}
    `;

    deleteModalReturnFocus = document.activeElement;
    deleteModalPrevOverflow = document.body.style.overflow;
    deleteSegmentModal.style.display = 'flex';
    document.body.style.overflow = 'hidden';
    deleteSegmentModalConfirm.focus();
  }

  function closeDeleteSegmentModal(restoreFocus = true) {
    if (deleteSegmentModal.style.display === 'none') return;

    deleteSegmentModal.style.display = 'none';
    deleteSegmentModalBody.innerHTML = '';
    document.body.style.overflow = deleteModalPrevOverflow;
    deleteModalPrevOverflow = '';
    if (restoreFocus && deleteModalReturnFocus && document.contains(deleteModalReturnFocus)) {
      deleteModalReturnFocus.focus();
    }
    deleteModalReturnFocus = null;
  }

  async function confirmDeleteSegment() {
    if (!selectedSegment) return;

    const seg = selectedSegment;
    closeDeleteSegmentModal(false);
    await performDeleteSegment(seg);
  }

  function sortSegmentsByKey() {
    allSegments.sort((a, b) => a.key.localeCompare(b.key));
  }

  function refreshSegmentIndicators() {
    return fetch(`/app/transcripts/api/ranges/${day}`)
      .then(r => r.ok ? r.json() : Promise.reject('Failed to fetch ranges'))
      .then(data => {
        segmentsLane.innerHTML = '';
        (data.audio || []).forEach(rg => {
          const s = parseTime(rg.start);
          const e = parseTime(rg.end);
          addSegmentIndicator('audio', s, e, 0, rg.streams);
        });
        (data.screen || []).forEach(rg => {
          const s = parseTime(rg.start);
          const e = parseTime(rg.end);
          addSegmentIndicator('screen', s, e, 1, rg.streams);
        });
      })
      .catch(() => {
        // Range indicators may be stale, but the main segment state is already updated.
      });
  }

  async function performDeleteSegment(seg) {
    try {
      const response = await fetch(`/app/transcripts/api/segment/${day}/${seg.stream}/${seg.key}`, {
        method: 'DELETE'
      });

      if (!response.ok) {
        const data = await response.json().catch(() => ({}));
        throw new Error(data.error || 'Failed to delete segment');
      }

      const data = await response.json();

      // Remove segment from local state
      allSegments = allSegments.filter(s => s.key !== seg.key);

      // Clear selection and UI
      clearSegmentSelection();

      // Re-render zoom timeline
      buildZoomSegments();

      refreshSegmentIndicators();

      let pendingNotificationId = null;
      pendingNotificationId = window.AppServices.notifications.show({
        app: 'transcripts',
        icon: '🗑️',
        title: 'Deleting segment…',
        message: 'Cancels in 10s',
        dismissible: true,
        autoDismiss: 10000,
        buttons: [{
          label: 'Cancel',
          dismiss: false,
          onClick: () => cancelSegmentDelete(data.pending, seg, pendingNotificationId)
        }]
      });

      if (data.search_index_warning === true) {
        window.AppServices.notifications.show({
          app: 'transcripts',
          icon: '⚠️',
          title: 'Search index may be stale',
          message: 'Search results may be briefly stale until the supervisor is restarted and the index is rebuilt.',
          dismissible: true,
          autoDismiss: 10000
        });
      }

    } catch (err) {
      const notice = document.createElement('div');
      notice.className = 'tr-warning-notice visible';
      notice.style.borderColor = '#fca5a5';
      notice.style.background = '#fef2f2';
      notice.style.color = '#991b1b';
      notice.innerHTML = '<svg viewBox="0 0 24 24"><path d="M10.29 3.86L1.82 18a2 2 0 0 0 1.71 3h16.94a2 2 0 0 0 1.71-3L13.71 3.86a2 2 0 0 0-3.42 0z"></path><line x1="12" y1="9" x2="12" y2="13"></line><line x1="12" y1="17" x2="12.01" y2="17"></line></svg> <span>' + escapeHtml(err.message) + '</span>';
      panel.insertBefore(notice, panel.firstChild);
      setTimeout(() => {
        notice.style.opacity = '0';
        setTimeout(() => notice.remove(), 300);
      }, 5000);
    }
  }

  async function cancelSegmentDelete(pendingId, seg, notificationId) {
    try {
      const response = await fetch(`/app/transcripts/api/cancel-delete/${pendingId}`, {
        method: 'POST'
      });
      const data = await response.json().catch(() => ({}));

      if (notificationId !== null) {
        window.AppServices.notifications.dismiss(notificationId);
      }

      if (response.ok) {
        if (!allSegments.some(existing => existing.key === seg.key)) {
          allSegments.push(seg);
          sortSegmentsByKey();
        }
        buildZoomSegments();
        refreshSegmentIndicators();
        window.AppServices.notifications.show({
          app: 'transcripts',
          icon: '↩️',
          title: 'Delete cancelled',
          autoDismiss: 3000
        });
        return;
      }

      if (response.status === 410) {
        window.AppServices.notifications.show({
          app: 'transcripts',
          icon: '⏱️',
          title: 'Too late — already deleted',
          autoDismiss: 3000
        });
        return;
      }

      throw new Error(data.error || 'Failed to cancel delete');
    } catch (err) {
      window.AppServices.notifications.show({
        app: 'transcripts',
        icon: '⚠️',
        title: 'Couldn\'t cancel delete',
        message: err.message || 'Please try again.',
        autoDismiss: 3000
      });
    }
  }

  window.closeDeleteSegmentModal = closeDeleteSegmentModal;
  window.confirmDeleteSegment = confirmDeleteSegment;

  // Clear selection and reset UI state
  function clearSegmentSelection() {
    selectedSegment = null;
    segmentData = null;
    currentVideoFiles = {};
    activeTab = null;
    tabPanes = {};
    screenDecoded = false;
    frameCapture.clear();
    allScreenFrames = [];
    currentFrameIndex = -1;
    groupEntriesByIdx.clear();

    // Stop and clear audio player reference
    panel.querySelectorAll('audio').forEach(audio => audio.pause());

    // Hide delete button
    deleteBtn.classList.remove('visible');

    // Clear URL hash
    history.replaceState(null, '', window.location.pathname);

    // Reset UI
    titleEl.textContent = 'transcripts';
    rangeText.textContent = '';
    tabsContainer.innerHTML = '';
    tabsContainer.classList.remove('visible');
    document.getElementById('trWarningNotice').classList.remove('visible');
    panel.innerHTML = window.SurfaceState.empty({
      icon: emptyIcons.day,
      heading: 'your day at a glance',
      desc: 'select a segment from the timeline to view its transcript'
    });

    // Clear active state in zoom view
    zoomSegments.querySelectorAll('.tr-zoom-pill').forEach(pill => {
      pill.classList.remove('tr-active');
    });
  }

  // Delete segment handler
  deleteBtn.addEventListener('click', () => {
    showDeleteSegmentModal();
  });

})();
</script>