/* PanPhyTrack: a video bench on graph paper, in the style of PanPhyPlot and PanPhyMD.
   The shell (app bar, panes, toolbars, menus, status bar) comes first; the video stage,
   playback bar, graph, points table and dialogs follow. */

*,
*::before,
*::after {
  box-sizing: border-box;
}

/* ---------------------------------------------------------------------- */
/* Tokens                                                                  */
/* ---------------------------------------------------------------------- */
:root {
  --brand-primary: var(--accent);
  --font-sans: var(--font-body);

  --paper: var(--bg);
  --grid-minor: rgba(28, 40, 90, 0.035);
  --grid-major: rgba(28, 40, 90, 0.075);
  --appbar-h: 56px;

  /* Series colors: PanPhyPlot's first two data colors (x blue, y red), so exported data looks the same there. */
  --series-x: #4E79A7;
  --series-y: #E15759;

  /* Read by the scripts for the graph and the video overlay, and by the shared
     theme and fullscreen buttons (--brand-primary, --brand-accent). */
  --chart-grid: rgba(23, 24, 26, 0.1);
  --chart-axis: rgba(23, 24, 26, 0.7);
  --chart-text: rgba(23, 24, 26, 0.85);
  --overlay-axis: rgba(255, 255, 255, 0.9);
  --overlay-shadow: rgba(0, 0, 0, 0.45);
  --text-muted: var(--ink-2);
  --copy-hint-outline: var(--accent);
  --copy-hint-chip-bg: var(--accent);
  --copy-hint-text: var(--accent-ink);
  --copy-ok: var(--good);
  --copy-fail: var(--danger);
}

[data-theme="dark"] {
  --grid-minor: rgba(150, 175, 255, 0.03);
  --grid-major: rgba(150, 175, 255, 0.065);

  --series-x: #7CB5EC;
  --series-y: #F48183;
  --chart-grid: rgba(232, 235, 237, 0.1);
  --chart-axis: rgba(232, 235, 237, 0.7);
  --chart-text: rgba(232, 235, 237, 0.88);
  --overlay-axis: rgba(255, 255, 255, 0.8);
  --overlay-shadow: rgba(0, 0, 0, 0.7);
}

/* ---------------------------------------------------------------------- */
/* Base                                                                    */
/* ---------------------------------------------------------------------- */
html,
body {
  margin: 0;
  padding: 0;
  overflow-x: hidden;
}

/* Graph paper: a 6px minor and 30px major grid. On wide screens the app
   fills the window, and the panes scroll inside it. */
body {
  display: flex;
  flex-direction: column;
  min-height: 100vh;
  min-height: 100dvh;
  font-family: var(--font-sans);
  font-size: 15px;
  line-height: 1.5;
  color: var(--ink);
  background-color: var(--paper);
  background-image:
    linear-gradient(var(--grid-major) 1px, transparent 1px),
    linear-gradient(90deg, var(--grid-major) 1px, transparent 1px),
    linear-gradient(var(--grid-minor) 1px, transparent 1px),
    linear-gradient(90deg, var(--grid-minor) 1px, transparent 1px);
  background-size: 30px 30px, 30px 30px, 6px 6px, 6px 6px;
  -webkit-font-smoothing: antialiased;
}

button,
input,
select,
textarea {
  font: inherit;
  color: inherit;
}

a {
  color: var(--accent);
  text-decoration: none;
}

a:hover {
  text-decoration: underline;
}

:focus-visible {
  outline: 2px solid var(--accent);
  outline-offset: 2px;
}

[hidden] {
  display: none !important;
}

/* Plain buttons (dialogs, table rows, the copy chip) start from this. */
button {
  margin: 0;
  padding: 8px 14px;
  font-size: 0.86rem;
  font-weight: 600;
  cursor: pointer;
  background: var(--surface);
  color: var(--ink);
  border: 1px solid var(--line-strong);
  border-radius: var(--radius-sm);
  transition: background-color 0.15s ease, border-color 0.15s ease, color 0.15s ease;
}

button:hover:not(:disabled) {
  background: var(--surface-3);
}

button:disabled {
  opacity: 0.9;
  cursor: not-allowed;
}

.mt-icon {
  width: 20px;
  height: 20px;
  flex: none;
  fill: none;
  stroke: currentColor;
  stroke-width: 1.7;
  stroke-linecap: round;
  stroke-linejoin: round;
}

.mt-caret {
  width: 12px;
  height: 12px;
  flex: none;
  margin-left: -2px;
  fill: none;
  stroke: currentColor;
  stroke-width: 1.6;
  stroke-linecap: round;
  stroke-linejoin: round;
  color: var(--ink-3);
  transition: transform 0.15s ease;
}

[aria-expanded="true"] > .mt-caret {
  transform: rotate(180deg);
}

.btn-primary {
  background: var(--accent);
  color: var(--accent-ink);
  border-color: transparent;
}

.btn-primary:hover:not(:disabled) {
  background: var(--accent-hover);
}

/* ---------------------------------------------------------------------- */
/* App bar                                                                 */
/* ---------------------------------------------------------------------- */
/* Color the home-screen top strip like the app bar, so they read as one header. */
:root, :root[data-theme="dark"] { --standalone-top-bg: var(--surface); }

.mt-appbar {
  position: sticky;
  top: 0;
  z-index: 30;
  flex: none;
  display: flex;
  align-items: center;
  gap: 14px;
  min-height: var(--appbar-h);
  padding: 0 14px 0;
  background: var(--surface);
  border-bottom: 1px solid var(--line);
}

/* One thin spectrum line under the app bar marks the app as PanPhy. */
.mt-appbar::after {
  content: '';
  position: absolute;
  left: 0;
  right: 0;
  bottom: -1px;
  height: 2px;
  background: var(--spectrum);
  opacity: 0.85;
  pointer-events: none;
}

.mt-brand {
  display: inline-flex;
  align-items: center;
  gap: 9px;
  flex: none;
  min-width: 0;
  color: var(--ink);
  text-decoration: none;
}

.mt-brand:hover {
  text-decoration: none;
}

.mt-brand > a {
  display: inline-flex;
}

.mt-brand img {
  width: 30px;
  height: 30px;
}

.mt-wordmark {
  font-family: var(--font-display);
  font-size: 1.02rem;
  font-weight: 600;
  letter-spacing: -0.03em;
  white-space: nowrap;
}

.mt-appbar-actions {
  display: flex;
  align-items: center;
  gap: 2px;
  margin-left: auto;
  flex: none;
}

/* Import Video, set off from Manual and the theme buttons. */
.mt-appbar-file {
  display: flex;
  align-items: center;
  gap: 2px;
  margin-right: 6px;
  padding-right: 6px;
  border-right: 1px solid var(--line);
}

/* ---------------------------------------------------------------------- */
/* Tools: the buttons in the app bar and the pane toolbars                 */
/* ---------------------------------------------------------------------- */
a.mt-tool { text-decoration: none; }
.mt-tool {
  display: inline-flex;
  align-items: center;
  gap: 6px;
  flex: none;
  min-height: 38px;
  padding: 6px 7px;
  border: 1px solid transparent;
  border-radius: var(--radius-sm);
  background: none;
  color: var(--ink);
  font-weight: 600;
  font-size: 0.86rem;
  white-space: nowrap;
}

.mt-tool:hover:not(:disabled),
.mt-tool[aria-expanded="true"] {
  background: var(--surface-3);
}

.mt-tool:active:not(:disabled) {
  background: var(--surface-3);
}

.mt-tool .mt-icon {
  color: var(--accent);
}

/* The struck-through eye on Marks while the marks are hidden. */
.mt-icon-slash {
  display: none;
}

[aria-pressed="true"] > .mt-icon .mt-icon-slash {
  display: inline;
}

.mt-tool-quiet {
  color: var(--ink-2);
}

.mt-tool-quiet .mt-icon {
  color: inherit;
}

.mt-tool-danger,
.mt-tool-danger .mt-icon {
  color: var(--danger);
}

.mt-tool-danger:hover:not(:disabled),
.mt-tool-danger[aria-expanded="true"] {
  background: var(--danger-soft);
}

/* A tool that is switched on (Scale or Origin while picking, marks hidden). */
.mt-tool[aria-pressed="true"] {
  background: var(--accent-soft);
  border-color: color-mix(in srgb, var(--accent) 35%, transparent);
}

.mt-tool:disabled {
  opacity: 0.9;
  cursor: not-allowed;
}

.mt-tool-mono {
  font-family: var(--font-mono);
  font-weight: 500;
  font-size: 0.82rem;
}

.pane-toolbar {
  flex: none;
  display: flex;
  align-items: center;
  flex-wrap: wrap;
  gap: 4px;
  padding: 6px 8px;
  background: var(--surface-2);
  border-bottom: 1px solid var(--line);
}

.mt-tool-group {
  display: flex;
  align-items: center;
  gap: 0;
  flex: none;
  padding-right: 4px;
  border-right: 1px solid var(--line);
}

.mt-tool-spacer {
  flex: 1;
}

/* Export CSV and Export to PanPhyPlot under one label, as in PanPhyPlot's toolbar. */
.mt-export-group {
  display: flex;
  align-items: center;
  flex: none;
  gap: 2px;
}

.mt-tool-group-label {
  padding: 0 4px;
  font-family: var(--font-mono);
  font-size: 0.64rem;
  letter-spacing: 0.08em;
  text-transform: uppercase;
  color: var(--ink-3);
}

/* Segmented controls: Position / Velocity, x / y / Both, Graph / Points. */
.mt-segmented {
  display: inline-flex;
  flex: none;
  padding: 3px;
  gap: 2px;
  border-radius: 999px;
  background: var(--surface-3);
  border: 1px solid var(--line);
}

.mt-segment {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  gap: 6px;
  min-height: 32px;
  padding: 3px 13px;
  border: none;
  border-radius: 999px;
  background: none;
  color: var(--ink-2);
  font-weight: 700;
  font-size: 0.84rem;
  white-space: nowrap;
}

.mt-segment:hover:not(:disabled) {
  background: none;
  color: var(--ink);
}

.mt-segment[aria-pressed="true"],
.mt-segment[aria-selected="true"],
.mt-segment[aria-pressed="true"]:hover,
.mt-segment[aria-selected="true"]:hover {
  background: var(--surface);
  color: var(--ink);
  box-shadow: var(--shadow-1);
}

.graph-controls {
  display: flex;
  flex-wrap: wrap;
  gap: 6px;
}

.series-dot {
  width: 8px;
  height: 8px;
  flex: none;
  border-radius: 50%;
}

.series-dot-x {
  background: var(--series-x);
}

.series-dot-y {
  background: var(--series-y);
}

.segment-count {
  min-width: 20px;
  padding: 0 6px;
  border-radius: 999px;
  background: var(--line);
  font-family: var(--font-mono);
  font-size: 0.72rem;
  font-weight: 500;
  line-height: 1.5;
  text-align: center;
}

/* ---------------------------------------------------------------------- */
/* Menus: Setup and Clear                                                 */
/* ---------------------------------------------------------------------- */
.mt-menu-wrap {
  position: relative;
  display: inline-flex;
  align-items: center;
}

.mt-menu {
  position: absolute;
  top: calc(100% + 6px);
  left: 0;
  z-index: 40;
  display: flex;
  flex-direction: column;
  gap: 2px;
  min-width: 200px;
  padding: 6px;
  border: 1px solid var(--line);
  border-radius: 12px;
  background: var(--surface);
  box-shadow: var(--shadow-2);
  animation: mt-pop 0.14s ease-out;
}

.mt-menu-right {
  left: auto;
  right: 0;
}

/* Keep the right-aligned menu inside the pane when Clear wraps to a new row. */
.mt-clear-tools {
  margin-left: auto;
}

@keyframes mt-pop {
  from {
    opacity: 0;
    transform: translateY(-4px) scale(0.98);
  }
}

.mt-menu-item {
  display: flex;
  flex-direction: column;
  align-items: flex-start;
  width: 100%;
  min-height: 40px;
  padding: 7px 12px;
  border: none;
  border-radius: 8px;
  background: none;
  color: var(--ink);
  font-weight: 600;
  font-size: 0.9rem;
  text-align: left;
}

.mt-menu-item small {
  font-weight: 500;
  font-size: 0.76rem;
  color: var(--ink-2);
}

.mt-menu-item:hover:not(:disabled),
.mt-menu-item:focus-visible {
  background: var(--surface-3);
}

.mt-menu-danger {
  color: var(--danger);
}

.mt-menu-danger:hover:not(:disabled),
.mt-menu-danger:focus-visible {
  background: var(--danger-soft);
}

@media (prefers-reduced-motion: reduce) {
  .mt-menu {
    animation: none;
  }
}

/* ---------------------------------------------------------------------- */
/* Workspace: the video pane and the graph pane                            */
/* ---------------------------------------------------------------------- */
/* The divider's 12px column is the gap between the panes. Dragging it sets --video-fr and --graph-fr. */
#workspace {
  flex: 1;
  display: grid;
  grid-template-columns: minmax(0, var(--video-fr, 1fr)) 12px minmax(0, var(--graph-fr, 1fr));
  gap: 12px 0;
  min-height: 0;
  margin: 12px;
}

.mt-divider {
  position: relative;
  z-index: 2;
  cursor: col-resize;
  touch-action: none;
  border-radius: 6px;
}

.mt-divider::after {
  content: '';
  position: absolute;
  top: 50%;
  left: 50%;
  width: 4px;
  height: 44px;
  border-radius: 4px;
  background: var(--line-strong);
  transform: translate(-50%, -50%);
  transition: background-color 0.15s ease, height 0.15s ease;
}

.mt-divider:hover::after,
.mt-divider:focus-visible::after,
.mt-is-resizing .mt-divider:focus::after {
  height: 72px;
  background: var(--accent);
}

.mt-divider:focus-visible {
  outline: none;
}

.mt-divider:focus-visible::after {
  outline: 2px solid var(--accent);
  outline-offset: 3px;
}

/* A wider invisible hit area for fingers and the pen. */
@media (pointer: coarse) {
  .mt-divider::before {
    content: '';
    position: absolute;
    inset: 0 -8px;
  }

  .mt-divider::after {
    width: 6px;
    height: 56px;
  }
}

.mt-is-resizing,
.mt-is-resizing * {
  cursor: col-resize !important;
  user-select: none !important;
  -webkit-user-select: none !important;
}

.mt-pane {
  display: flex;
  flex-direction: column;
  position: relative;
  min-width: 0;
  min-height: 0;
  background: var(--surface);
  border: 1px solid var(--line);
  border-radius: var(--radius);
  box-shadow: var(--shadow-1);
  overflow: hidden;
}

/* Wide screens: the app fills the window below the app bar. */
@media (min-width: 901px) {
  body {
    height: 100vh;
    height: 100dvh;
  }

  #workspace {
    grid-template-rows: minmax(0, 1fr);
  }
}

.pane-head {
  flex: none;
  display: flex;
  align-items: center;
  gap: 12px;
  min-width: 0;
  min-height: 52px;
  padding: 8px 12px 8px 16px;
  border-bottom: 1px solid var(--line);
}

.pane-head .mt-segmented {
  padding: 2px;
}

.pane-head .mt-segment {
  min-height: 28px;
  padding-block: 2px;
}

@media (pointer: coarse) {
  #graphPane > .pane-head {
    padding-block: 0;
  }

  .pane-head .mt-segmented {
    padding: 0;
  }

  .pane-head .mt-segment {
    min-height: 48px;
  }
}

.pane-title {
  display: flex;
  align-items: baseline;
  gap: 12px;
  min-width: 0;
  flex: 1;
}

.pane-heading {
  margin: 0;
  font-family: var(--font-display);
  font-weight: 500;
  font-size: 0.98rem;
  letter-spacing: -0.02em;
  white-space: nowrap;
}

.pane-hint {
  margin: 0;
  min-width: 0;
  font-size: 0.8rem;
  color: var(--ink-3);
  white-space: nowrap;
  overflow: hidden;
  text-overflow: ellipsis;
}

/* ---------------------------------------------------------------------- */
/* Message strip: what to do next, and Cancel while picking                */
/* ---------------------------------------------------------------------- */
.mt-message {
  flex: none;
  display: flex;
  align-items: center;
  gap: 10px;
  min-height: 40px;
  padding: 6px 10px 6px 14px;
  border-bottom: 1px solid var(--line);
  background: var(--surface-2);
  font-size: 0.84rem;
  color: var(--ink-2);
}

.mt-message .mt-icon {
  width: 18px;
  height: 18px;
  color: var(--ink-3);
}

#message {
  flex: 1;
  min-width: 0;
}

#message p,
#message ul {
  margin: 0;
}

.mt-message.is-mode {
  background: var(--accent-soft);
  color: var(--ink);
  font-weight: 600;
}

.mt-message.is-mode .mt-icon {
  color: var(--accent);
}

#modeCancel,
#autoStop {
  flex: none;
  min-height: 32px;
  padding: 4px 14px;
}

/* ---------------------------------------------------------------------- */
/* Video stage                                                             */
/* ---------------------------------------------------------------------- */
/* The script sizes #videoWrapper to the video's shape, fitted to this box. */
.video-stage {
  position: relative;
  flex: 1 1 0;
  display: flex;
  align-items: center;
  justify-content: center;
  min-height: 0;
  padding: 12px;
  overflow: auto;
  background:
    radial-gradient(circle at center, color-mix(in srgb, var(--surface-3) 60%, transparent), transparent 70%),
    var(--surface-2);
}

.video-stage.is-dragover {
  outline: 2px dashed var(--accent);
  outline-offset: -8px;
  background: var(--accent-soft);
}

#videoWrapper {
  position: relative;
  flex: none;
  overflow: hidden;
  border-radius: 6px;
  background: #000;
  box-shadow: 0 6px 22px rgba(0, 0, 0, 0.18);
}

#hiddenVideo {
  display: none;
}

#frameCanvas,
#overlayCanvas {
  position: absolute;
  inset: 0;
  display: block;
  width: 100%;
  height: 100%;
}

#frameCanvas {
  cursor: crosshair;
  touch-action: manipulation;
}

#overlayCanvas {
  z-index: 2;
  pointer-events: none;
  touch-action: none;
  cursor: crosshair;
}

/* Before a video is opened. */
.empty-state {
  display: flex;
  flex-direction: column;
  align-items: center;
  gap: 10px;
  max-width: 440px;
  margin: auto;
  padding: 18px 12px;
  text-align: center;
}

.empty-illustration {
  width: 120px;
  height: 84px;
  color: var(--accent);
}

.empty-title {
  margin: 0;
  font-family: var(--font-display);
  font-weight: 500;
  font-size: 1.12rem;
  letter-spacing: -0.02em;
  line-height: 1.2;
}

.empty-lead {
  margin: 0;
  font-size: 0.9rem;
  color: var(--ink-2);
}

.empty-import {
  display: inline-flex;
  align-items: center;
  gap: 8px;
  min-height: 46px;
  margin-top: 4px;
  padding: 10px 20px;
  border-radius: 999px;
  font-size: 0.95rem;
}

.empty-actions {
  display: flex;
  flex-wrap: wrap;
  justify-content: center;
  gap: 8px;
}

.empty-drop {
  margin: 0;
  font-size: 0.78rem;
  color: var(--ink-3);
}

.empty-steps {
  display: grid;
  gap: 8px;
  width: 100%;
  margin: 12px 0 0;
  padding: 14px 0 0;
  border-top: 1px solid var(--line);
  list-style: none;
  counter-reset: step;
  text-align: left;
}

.empty-steps li {
  display: grid;
  grid-template-columns: 26px 1fr;
  gap: 10px;
  align-items: start;
  font-size: 0.86rem;
  color: var(--ink-2);
  counter-increment: step;
}

.empty-steps li::before {
  content: counter(step);
  display: grid;
  place-items: center;
  width: 24px;
  height: 24px;
  border-radius: 50%;
  background: var(--accent-soft);
  color: var(--accent);
  font-family: var(--font-mono);
  font-size: 0.78rem;
  font-weight: 600;
}

.empty-steps strong {
  color: var(--ink);
}

@media (min-width: 901px) and (max-height: 850px) {
  .empty-state {
    max-width: 520px;
    gap: 8px;
    padding-block: 0;
  }

  .empty-illustration {
    width: 90px;
    height: 56px;
  }

  .empty-steps {
    gap: 6px;
    margin-top: 8px;
    padding-top: 10px;
  }
}

@media (min-width: 901px) and (max-height: 760px) {
  .empty-illustration {
    display: none;
  }
}

/* ---------------------------------------------------------------------- */
/* Playback bar                                                            */
/* ---------------------------------------------------------------------- */
.playback-controls {
  flex: none;
  display: flex;
  align-items: center;
  gap: 6px 10px;
  padding: 8px 10px;
  border-top: 1px solid var(--line);
  background: var(--surface-2);
}

.transport {
  display: flex;
  align-items: center;
  gap: 2px;
  flex: none;
}

.transport-btn {
  display: inline-grid;
  place-items: center;
  width: 42px;
  height: 42px;
  padding: 0;
  border: 1px solid transparent;
  border-radius: 50%;
  background: none;
  color: var(--ink);
}

.transport-btn:hover:not(:disabled) {
  background: var(--surface-3);
}

.transport-btn .mt-icon {
  width: 22px;
  height: 22px;
}

#playPause {
  width: 46px;
  height: 46px;
  background: var(--accent);
  color: var(--accent-ink);
}

#playPause:hover:not(:disabled) {
  background: var(--accent-hover);
}

#playPause .mt-icon {
  fill: currentColor;
  stroke-width: 1.2;
}

#slider {
  flex: 1;
  min-width: 100px;
  height: 28px;
  margin: 0;
  cursor: pointer;
  -webkit-appearance: none;
  appearance: none;
  background: transparent;
}

#slider:disabled {
  cursor: not-allowed;
  opacity: 0.45;
}

#slider::-webkit-slider-runnable-track {
  height: 6px;
  border-radius: 3px;
  background: var(--line-strong);
}

#slider::-webkit-slider-thumb {
  -webkit-appearance: none;
  appearance: none;
  width: 20px;
  height: 20px;
  margin-top: -7px;
  border-radius: 50%;
  border: 3px solid var(--surface);
  background: var(--accent);
  box-shadow: 0 1px 4px rgba(0, 0, 0, 0.3);
}

#slider::-moz-range-track {
  height: 6px;
  border-radius: 3px;
  background: var(--line-strong);
}

#slider::-moz-range-thumb {
  width: 14px;
  height: 14px;
  border-radius: 50%;
  border: 3px solid var(--surface);
  background: var(--accent);
  box-shadow: 0 1px 4px rgba(0, 0, 0, 0.3);
}

.time-readout {
  display: flex;
  flex-direction: column;
  align-items: flex-end;
  flex: none;
  min-width: 104px;
  font-family: var(--font-mono);
  font-variant-numeric: tabular-nums;
  line-height: 1.25;
}

#timeDisplay {
  font-size: 0.95rem;
  font-weight: 500;
  color: var(--ink);
}

#frameDisplay {
  font-size: 0.72rem;
  color: var(--ink-3);
}

.step-field {
  display: inline-flex;
  align-items: center;
  gap: 6px;
  flex: none;
  font-size: 0.8rem;
  font-weight: 600;
  color: var(--ink-2);
}

.step-field select {
  min-height: 34px;
  padding: 4px 8px;
  border: 1px solid var(--line-strong);
  border-radius: var(--radius-sm);
  background: var(--surface);
  font-family: var(--font-mono);
  font-size: 0.8rem;
  cursor: pointer;
}

/* ---------------------------------------------------------------------- */
/* Graph pane                                                              */
/* ---------------------------------------------------------------------- */
.graph-body {
  position: relative;
  flex: 1 1 0;
  display: flex;
  flex-direction: column;
  min-height: 0;
  padding: 12px;
}

.graph-view {
  flex: 1 1 0;
  display: flex;
  flex-direction: column;
  min-height: 0;
}

/* Chart.js sizes the canvas to this box, so the box must not grow with it. */
#chartCanvasContainer {
  position: relative;
  flex: 1 1 0;
  min-height: 260px;
  border-radius: 10px;
  outline: none;
}

#chartCanvasContainer canvas {
  position: absolute;
  inset: 0;
}

.graph-empty {
  position: absolute;
  inset: 0;
  z-index: 3;
  display: flex;
  flex-direction: column;
  align-items: center;
  justify-content: center;
  gap: 8px;
  padding: 24px;
  text-align: center;
  background: color-mix(in srgb, var(--surface) 82%, transparent);
  border-radius: 10px;
  pointer-events: none;
}

.graph-empty svg {
  width: 84px;
  height: 64px;
  color: var(--accent);
}

.graph-empty-title {
  margin: 0;
  font-family: var(--font-display);
  font-weight: 500;
  font-size: 0.98rem;
  letter-spacing: -0.02em;
}

.graph-empty-text {
  margin: 0;
  max-width: 280px;
  font-size: 0.86rem;
  color: var(--ink-2);
}

/* Click (or tap, then the chip) to copy the graph as an image. */
#chartCanvasContainer.copy-ready.has-data {
  cursor: pointer;
}

#chartCanvasContainer.copy-ready.has-data:hover,
#chartCanvasContainer.copy-ready.has-data:focus-visible {
  box-shadow: 0 0 0 2px var(--copy-hint-outline);
}

#chartCanvasContainer.copy-ready::after {
  content: "Copy image";
  position: absolute;
  top: 8px;
  left: 50%;
  z-index: 10;
  padding: 3px 11px;
  border-radius: 999px;
  background: var(--copy-hint-chip-bg);
  color: var(--copy-hint-text);
  font-family: var(--font-sans);
  font-size: 11px;
  font-weight: 700;
  white-space: nowrap;
  box-shadow: 0 2px 6px rgba(0, 0, 0, 0.14);
  opacity: 0;
  transform: translateX(-50%);
  pointer-events: none;
  transition: opacity 0.15s ease;
}

#chartCanvasContainer.copy-ready.has-data:hover::after,
#chartCanvasContainer.copy-ready.has-data:focus-visible::after {
  opacity: 1;
}

#chartCanvasContainer.copy-ready.copied {
  box-shadow: 0 0 0 2px var(--copy-ok) !important;
}

#chartCanvasContainer.copy-ready.copied::after {
  content: "Copied!" !important;
  background: var(--copy-ok) !important;
  color: #FFFFFF !important;
  opacity: 1 !important;
}

#chartCanvasContainer.copy-ready.copy-failed {
  box-shadow: 0 0 0 2px var(--copy-fail) !important;
}

#chartCanvasContainer.copy-ready.copy-failed::after {
  content: "Copy failed" !important;
  background: var(--copy-fail) !important;
  color: #FFFFFF !important;
  opacity: 1 !important;
}

#chartCanvasContainer.copy-ready.copying::after {
  content: "Copying..." !important;
  opacity: 1 !important;
}

#chartCopyAction {
  position: absolute;
  top: 8px;
  right: 8px;
  z-index: 12;
  padding: 5px 12px;
  border: 1px solid var(--copy-hint-outline);
  border-radius: 999px;
  background: var(--copy-hint-chip-bg);
  color: var(--copy-hint-text);
  font-size: 12px;
  font-weight: 700;
  box-shadow: 0 2px 6px rgba(0, 0, 0, 0.14);
  opacity: 0;
  transform: translateY(-4px);
  pointer-events: none;
  transition: opacity 0.15s ease, transform 0.15s ease;
}

#chartCanvasContainer.touch-copy-mode::after {
  display: none;
}

#chartCanvasContainer.touch-copy-open {
  box-shadow: 0 0 0 2px var(--copy-hint-outline);
}

#chartCanvasContainer.touch-copy-open #chartCopyAction {
  opacity: 1;
  transform: translateY(0);
  pointer-events: auto;
}

#chartCanvasContainer.touch-copy-open.copying #chartCopyAction {
  opacity: 0.85;
  pointer-events: none;
}

#chartCanvasContainer.touch-copy-open.copied #chartCopyAction {
  border-color: var(--copy-ok);
  background: var(--copy-ok);
  color: #FFFFFF;
}

#chartCanvasContainer.touch-copy-open.copy-failed #chartCopyAction {
  border-color: var(--copy-fail);
  background: var(--copy-fail);
  color: #FFFFFF;
}

@media (hover: none), (pointer: coarse) {
  #chartCanvasContainer.copy-ready::after {
    display: none;
  }
}

/* ---------------------------------------------------------------------- */
/* Points table                                                            */
/* ---------------------------------------------------------------------- */
#pointEditor {
  flex: 1 1 0;
  display: flex;
  flex-direction: column;
  min-height: 260px;
}

.points-note {
  margin: 0 0 10px;
  font-size: 0.8rem;
  color: var(--ink-3);
}

.points-scroll {
  flex: 1 1 0;
  min-height: 0;
  overflow: auto;
  border: 1px solid var(--line);
  border-radius: 10px;
}

.points-table {
  width: 100%;
  border-collapse: collapse;
  font-size: 0.86rem;
}

.points-table th {
  position: sticky;
  top: 0;
  z-index: 1;
  padding: 8px 10px;
  border-bottom: 1px solid var(--line);
  background: var(--surface-2);
  font-family: var(--font-mono);
  font-size: 0.74rem;
  font-weight: 500;
  color: var(--ink-2);
  text-align: left;
  white-space: nowrap;
}

.points-table td {
  padding: 4px 6px;
  border-bottom: 1px solid var(--line);
}

.points-table tr:last-child td {
  border-bottom: none;
}

.points-table tr.is-current td {
  background: var(--accent-soft);
}

.points-table input {
  width: 100%;
  min-width: 80px;
  min-height: 38px;
  padding: 4px 8px;
  border: 1px solid transparent;
  border-radius: 7px;
  background: none;
  font-family: var(--font-mono);
  font-size: 0.84rem;
  font-variant-numeric: tabular-nums;
}

.points-table input:hover {
  border-color: var(--line);
}

.points-table input:focus {
  outline: none;
  border-color: var(--accent);
  background: var(--surface);
  box-shadow: 0 0 0 3px var(--focus);
}

.point-time {
  min-height: 38px;
  padding: 4px 8px;
  border: none;
  border-radius: 7px;
  background: none;
  color: var(--accent);
  font-family: var(--font-mono);
  font-size: 0.84rem;
  font-weight: 500;
  font-variant-numeric: tabular-nums;
}

.point-delete {
  display: inline-grid;
  place-items: center;
  width: 38px;
  height: 38px;
  padding: 0;
  border: none;
  border-radius: 8px;
  background: none;
  color: var(--danger);
}

.point-delete:hover:not(:disabled) {
  background: var(--danger-soft);
  color: var(--danger);
}

.point-delete .mt-icon {
  width: 18px;
  height: 18px;
}

.points-empty {
  padding: 28px 16px;
  color: var(--ink-3);
  font-size: 0.86rem;
  text-align: center;
}

/* ---------------------------------------------------------------------- */
/* Status bar                                                              */
/* ---------------------------------------------------------------------- */
.mt-statusbar {
  flex: none;
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 12px;
  min-height: 30px;
  padding: 4px 14px calc(4px + env(safe-area-inset-bottom, 0px));
  border-top: 1px solid var(--line);
  background: var(--surface-2);
  font-size: 0.76rem;
  color: var(--ink-3);
}

.mt-status {
  display: inline-flex;
  flex-wrap: wrap;
  gap: 2px 14px;
  min-width: 0;
  font-family: var(--font-mono);
}

.mt-status span {
  white-space: nowrap;
}

.mt-statusbar-legal {
  white-space: nowrap;
}

.mt-statusbar a {
  color: var(--ink-2);
}

/* ---------------------------------------------------------------------- */
/* Dialogs                                                                 */
/* ---------------------------------------------------------------------- */
.mt-dialog {
  width: min(440px, calc(100vw - 32px));
  max-height: calc(100dvh - 32px);
  padding: 22px 24px;
  border: 1px solid var(--line);
  border-radius: 18px;
  background: var(--surface);
  color: var(--ink);
  box-shadow: var(--shadow-2);
  overscroll-behavior: contain;
}

.mt-dialog::backdrop {
  background: rgba(13, 16, 18, 0.45);
  backdrop-filter: blur(2px);
  -webkit-backdrop-filter: blur(2px);
}

.mt-dialog[open] {
  animation: mt-pop 0.16s ease-out;
}

.mt-dialog form {
  display: flex;
  flex-direction: column;
  gap: 14px;
}

.modal-title {
  margin: 0;
  font-family: var(--font-display);
  font-size: 1.15rem;
  font-weight: 500;
  letter-spacing: -0.02em;
}

.modal-lead {
  margin: -6px 0 0;
  font-size: 0.88rem;
  color: var(--ink-2);
}

.modal-field {
  display: flex;
  flex-direction: column;
  gap: 6px;
}

.modal-field-label {
  font-size: 0.85rem;
  font-weight: 600;
  color: var(--ink-2);
}

.modal-hint {
  margin: 0;
  font-size: 0.78rem;
  color: var(--ink-3);
}

.modal-row {
  display: grid;
  grid-template-columns: minmax(0, 1.4fr) minmax(0, 1fr);
  gap: 10px;
}

.modal-input {
  width: 100%;
  min-height: 44px;
  padding: 8px 12px;
  border: 1px solid var(--line-strong);
  border-radius: var(--radius-sm);
  background: var(--surface);
  font-size: 0.95rem;
}

.modal-input[type="number"] {
  font-family: var(--font-mono);
}

.modal-input:focus {
  outline: none;
  border-color: var(--accent);
  box-shadow: 0 0 0 3px var(--focus);
}

.modal-input-suffix {
  position: relative;
}

.modal-input-suffix .modal-input {
  padding-right: 46px;
}

.modal-input-suffix span {
  position: absolute;
  top: 50%;
  right: 12px;
  transform: translateY(-50%);
  font-family: var(--font-mono);
  font-size: 0.82rem;
  color: var(--ink-3);
  pointer-events: none;
}

.detected-chip {
  align-self: flex-start;
  padding: 2px 10px;
  border-radius: 999px;
  background: var(--accent-soft);
  font-size: 0.78rem;
  font-weight: 600;
  color: var(--ink-2);
}

#detectedFpsDisplay {
  font-family: var(--font-mono);
  color: var(--accent);
}

.modal-check {
  display: flex;
  align-items: flex-start;
  gap: 10px;
  padding: 10px 12px;
  border: 1px solid var(--line);
  border-radius: var(--radius-sm);
  background: var(--surface-2);
  font-size: 0.88rem;
  font-weight: 600;
  cursor: pointer;
}

.modal-check input {
  width: 18px;
  height: 18px;
  margin: 2px 0 0;
  flex: none;
  accent-color: var(--accent);
  cursor: pointer;
}

.modal-check small {
  display: block;
  font-weight: 500;
  font-size: 0.78rem;
  color: var(--ink-3);
}

.modal-buttons {
  display: flex;
  justify-content: flex-end;
  gap: 10px;
  margin-top: 4px;
}

.modal-buttons button {
  min-width: 96px;
  min-height: 44px;
  padding: 8px 16px;
  font-size: 0.9rem;
}

body.modal-open {
  overflow: hidden;
}

/* ---------------------------------------------------------------------- */
/* Narrow screens: the panes stack and the page scrolls                    */
/* ---------------------------------------------------------------------- */
@media (max-width: 900px) {
  #workspace {
    grid-template-columns: minmax(0, 1fr);
    margin: 8px;
    gap: 8px;
  }

  .mt-divider {
    display: none;
  }

  .mt-appbar {
    gap: 10px;
    padding-left: 12px;
    padding-right: 8px;
  }

  .video-stage {
    flex: none;
    min-height: 220px;
  }

  .graph-body,
  .graph-view,
  #chartCanvasContainer {
    flex: none;
  }

  #chartCanvasContainer {
    height: 320px;
  }

  #pointEditor {
    flex: none;
  }

  .points-scroll {
    flex: none;
    max-height: 360px;
  }
}

@media (max-width: 600px) {
  .mt-wordmark,
  .mt-appbar-actions .mt-tool > span:not(.keep-label),
  .label-extra {
    display: none;
  }

  .mt-appbar-actions {
    gap: 0;
  }

  .mt-appbar-file {
    margin-right: 2px;
    padding-right: 2px;
  }

  .pane-toolbar {
    padding: 4px 6px;
    gap: 2px 4px;
  }

  .mt-tool {
    padding: 6px 8px;
  }

  /* The toolbars wrap here, so the group separators would dangle at row ends. */
  .mt-tool-group {
    padding-right: 0;
    border-right: none;
  }

  .pane-hint {
    display: none;
  }

  .playback-controls {
    flex-wrap: wrap;
  }

  /* Two rows: the buttons and the time, then the slider and Step. */
  #slider {
    order: 5;
    flex: 1 1 0;
  }

  .step-field {
    order: 6;
  }

  /* The video pane needs no heading on a phone; the Results tabs keep theirs. */
  #videoPane .pane-head {
    display: none;
  }

  .time-readout {
    margin-left: auto;
  }

  .mt-statusbar {
    flex-direction: column;
    align-items: flex-start;
    gap: 2px;
  }

  .modal-row {
    grid-template-columns: minmax(0, 1fr);
  }
}

/* Touch: 48px targets. */
@media (pointer: coarse) {
  .mt-tool,
  .mt-menu-item,
  .step-field select,
  #modeCancel,
  #autoStop {
    min-height: 48px;
  }

  .mt-segment {
    min-height: 48px;
  }

  .mt-segmented {
    padding: 2px;
  }

  .transport-btn,
  #playPause {
    width: 48px;
    height: 48px;
  }

  #slider {
    height: 48px;
  }

  #slider::-webkit-slider-thumb {
    width: 28px;
    height: 28px;
    margin-top: -11px;
  }

  #slider::-moz-range-thumb {
    width: 22px;
    height: 22px;
  }

  .points-table input,
  .point-time,
  .point-delete {
    min-height: 48px;
  }

  .point-delete {
    width: 48px;
    height: 48px;
  }

  .modal-buttons button,
  .modal-input {
    min-height: 48px;
  }

  button,
  select,
  input {
    touch-action: manipulation;
  }
}

/* Compact history and deletion tools retain the same hit area as labeled tools. */
.mt-tool.mt-tool-icon {
  width: 48px;
  min-height: 48px;
  padding: 8px;
  justify-content: center;
}

#frameCanvas.is-selecting {
  cursor: pointer;
}

.points-table tr.is-selected td {
  background: var(--accent-soft);
}

.points-table tr.is-selected td:first-child {
  box-shadow: inset 3px 0 var(--accent);
}

#frameRateHint {
  flex: none;
  max-width: 160px;
  white-space: normal;
  text-align: left;
}

/* Match the graph pane’s compact segmented controls. */
.video-toolbar {
  gap: 4px;
}

.video-toolbar .mt-tool-icon {
  width: 38px;
  min-height: 38px;
}

.mt-history-tools {
  display: flex;
  align-items: center;
  flex: none;
}

.mt-tracking-modes .mt-segment {
  padding-inline: 8px;
}

.mt-tracking-modes .mt-icon,
.mt-message .mt-tool .mt-icon {
  color: var(--accent);
}

#deleteSelected .mt-icon {
  color: var(--danger);
}

#setupMenu .mt-menu-item {
  display: flex;
  align-items: center;
  gap: 10px;
  min-height: 48px;
}

#setupMenu .mt-menu-item[aria-pressed="true"] {
  background: var(--accent-soft);
}

#setupMenu .mt-menu-item > .mt-icon {
  width: 18px;
  height: 18px;
  color: var(--accent);
}

#frameRateHint,
#deleteSelected {
  flex: none;
  min-height: 26px;
  padding-block: 2px;
}

@media (max-width: 600px) {
  .video-toolbar #setupButton {
    width: 48px;
    padding: 8px;
    justify-content: center;
  }

  #setupButton > span,
  #setupButton > .mt-caret {
    display: none;
  }

  .video-toolbar .mt-history-tools {
    order: 1;
    flex-grow: 1;
    justify-content: flex-end;
  }

  .video-toolbar .mt-clear-tools {
    order: 1;
  }
}

@media (pointer: coarse) {
  .mt-message {
    min-height: 61px;
  }

  #frameRateHint,
  #deleteSelected {
    min-height: 48px;
  }

  .video-toolbar .mt-tool-icon {
    width: 48px;
    min-height: 48px;
  }
}