:root {
  --paper: #f4f3ef;
  --surface: #ffffff;
  --ink: #202124;
  --muted: #6a6f73;
  --line: #d9d9d5;
  --line-strong: #b9bbb8;
  --gt: #202124;
  --original: #39789b;
  --independent: #c5523a;
  --drop: #777b7e;
  --focus: #0c6f9c;
  color-scheme: light;
  font-family: "IBM Plex Sans", "Aptos", "Segoe UI", sans-serif;
}

* {
  box-sizing: border-box;
}

[hidden] {
  display: none !important;
}

html {
  background: var(--paper);
}

body {
  margin: 0;
  min-width: 320px;
  min-height: 100vh;
  color: var(--ink);
  background:
    linear-gradient(rgba(32, 33, 36, 0.035) 1px, transparent 1px),
    var(--paper);
  background-size: 100% 28px;
}

button,
input,
select {
  font: inherit;
}

button,
select,
input[type="range"],
.chart-wrap {
  -webkit-tap-highlight-color: transparent;
}

button:focus-visible,
select:focus-visible,
input:focus-visible,
.chart-wrap:focus-visible {
  outline: 3px solid color-mix(in srgb, var(--focus) 34%, transparent);
  outline-offset: 3px;
}

.demo-navigation {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 18px;
  min-height: 58px;
  border-bottom: 1px solid var(--line-strong);
}

.tab-list,
.video-picker,
.demo-options {
  display: flex;
  align-items: center;
}

.tab-list {
  align-self: stretch;
  gap: 22px;
}

.tab-button {
  position: relative;
  align-self: stretch;
  padding: 0 2px;
  border: 0;
  background: transparent;
  color: var(--muted);
  cursor: pointer;
  font-weight: 650;
}

.tab-button::after {
  position: absolute;
  right: 0;
  bottom: -1px;
  left: 0;
  height: 3px;
  background: transparent;
  content: "";
}

.tab-button[data-active="true"] {
  color: var(--ink);
}

.tab-button[data-active="true"]::after {
  background: var(--ink);
}

.demo-options {
  justify-content: flex-end;
  gap: 18px;
}

.video-picker {
  border: 1px solid var(--line-strong);
}

.video-button {
  min-width: 60px;
  min-height: 32px;
  padding: 5px 10px;
  border: 0;
  border-right: 1px solid var(--line);
  background: rgba(255, 255, 255, 0.65);
  color: var(--muted);
  cursor: pointer;
  font-family: "IBM Plex Mono", "Cascadia Mono", monospace;
  font-size: 0.72rem;
}

.video-button:last-child {
  border-right: 0;
}

.video-button[data-active="true"] {
  background: var(--ink);
  color: #fff;
}

.switch-control {
  display: inline-flex;
  align-items: center;
  gap: 9px;
  color: #4f5558;
  cursor: pointer;
  font-size: 0.76rem;
  font-weight: 600;
  white-space: nowrap;
}

.switch-control input {
  position: absolute;
  width: 1px;
  height: 1px;
  opacity: 0;
}

.switch-track {
  display: inline-flex;
  width: 36px;
  height: 20px;
  align-items: center;
  padding: 2px;
  border: 1px solid #9da1a2;
  border-radius: 10px;
  background: #d7d8d5;
  transition: background 120ms ease;
}

.switch-track span {
  width: 14px;
  height: 14px;
  border-radius: 50%;
  background: #fff;
  box-shadow: 0 1px 3px rgba(32, 33, 36, 0.25);
  transition: transform 120ms ease;
}

.switch-control input:checked + .switch-track {
  border-color: #39789b;
  background: #39789b;
}

.switch-control input:checked + .switch-track span {
  transform: translateX(16px);
}

.switch-control input:focus-visible + .switch-track {
  outline: 3px solid color-mix(in srgb, var(--focus) 34%, transparent);
  outline-offset: 2px;
}

.demo-summary {
  display: grid;
  grid-template-columns: minmax(140px, 0.25fr) minmax(0, 1fr);
  align-items: center;
  gap: 24px;
  padding: 16px 2px 0;
}

.demo-summary > p {
  margin: 0;
  color: var(--muted);
  font-size: 0.82rem;
  line-height: 1.5;
}

.metric-strip {
  display: grid;
  grid-template-columns: auto repeat(4, minmax(72px, 1fr));
  border: 1px solid var(--line);
  background: rgba(255, 255, 255, 0.65);
}

.metric-strip > span {
  display: grid;
  gap: 3px;
  min-width: 82px;
  padding: 8px 10px;
  border-right: 1px solid var(--line);
}

.metric-strip > span:last-child {
  border-right: 0;
}

.metric-definition {
  background: #ecece8;
}

.metric-strip small {
  color: var(--muted);
  font-size: 0.61rem;
  line-height: 1.35;
}

.metric-strip strong {
  font-family: "IBM Plex Mono", "Cascadia Mono", monospace;
  font-size: 0.9rem;
}

.app-shell {
  width: min(1520px, calc(100% - 40px));
  margin: 0 auto;
  padding: 28px 0 40px;
}

.app-header {
  min-height: 72px;
  display: flex;
  align-items: flex-end;
  justify-content: space-between;
  gap: 24px;
  padding: 0 2px 18px;
  border-bottom: 1px solid var(--line-strong);
}

.eyebrow,
.section-kicker {
  margin: 0 0 5px;
  color: var(--muted);
  font-family: "IBM Plex Mono", "Cascadia Mono", monospace;
  font-size: 0.72rem;
  font-weight: 600;
  letter-spacing: 0;
  text-transform: uppercase;
}

h1,
h2 {
  margin: 0;
  font-family: "IBM Plex Sans Condensed", "Aptos Display", sans-serif;
  letter-spacing: 0;
}

h1 {
  font-size: clamp(1.75rem, 3vw, 2.65rem);
  line-height: 1;
  font-weight: 650;
}

h2 {
  font-size: 1.05rem;
  line-height: 1.2;
  font-weight: 650;
}

.status-cluster {
  display: flex;
  align-items: center;
  gap: 10px;
  flex-wrap: wrap;
  justify-content: flex-end;
}

.drop-status,
.time-chip,
.score-scale,
.video-id {
  display: inline-flex;
  align-items: center;
  min-height: 30px;
  padding: 5px 9px;
  border: 1px solid var(--line);
  background: rgba(255, 255, 255, 0.72);
  color: var(--muted);
  font-family: "IBM Plex Mono", "Cascadia Mono", monospace;
  font-size: 0.72rem;
}

.status-dot {
  width: 8px;
  height: 8px;
  margin-right: 7px;
  background: #48a36d;
  border-radius: 50%;
}

.drop-status[data-dropped="true"] {
  color: #4b4f52;
  border-color: #bfc1c1;
  background: #e2e3e3;
}

.drop-status[data-dropped="true"] .status-dot {
  background: var(--drop);
}

.upper-grid {
  display: grid;
  grid-template-columns: minmax(340px, 0.76fr) minmax(520px, 1.24fr);
  gap: 18px;
  margin-top: 18px;
}

.salience-panel,
.video-panel,
.chart-panel {
  min-width: 0;
  border: 1px solid var(--line-strong);
  background: rgba(255, 255, 255, 0.92);
  box-shadow: 0 8px 24px rgba(32, 33, 36, 0.055);
}

.salience-panel,
.video-panel {
  min-height: 390px;
}

.salience-panel {
  display: flex;
  flex-direction: column;
  padding: 18px 20px;
}

.section-heading,
.video-heading,
.chart-heading {
  display: flex;
  align-items: flex-start;
  justify-content: space-between;
  gap: 18px;
}

.meters {
  display: grid;
  gap: 14px;
  margin: auto 0;
  padding: 16px 0;
}

.meter.is-clean .series-name::after {
  margin-left: 7px;
  color: var(--muted);
  content: "dashed";
  font-family: "IBM Plex Mono", "Cascadia Mono", monospace;
  font-size: 0.61rem;
  font-weight: 500;
}

.meter-copy {
  display: flex;
  align-items: baseline;
  justify-content: space-between;
  gap: 12px;
  margin-bottom: 8px;
}

.series-name {
  display: inline-flex;
  align-items: center;
  min-width: 0;
  font-size: 0.9rem;
  font-weight: 600;
}

.series-swatch {
  width: 10px;
  height: 10px;
  margin-right: 9px;
  border-radius: 50%;
  flex: none;
}

.swatch-gt,
.fill-gt,
.marker-gt {
  background: var(--gt);
}

.swatch-original,
.fill-original,
.marker-original {
  background: var(--original);
}

.swatch-independent,
.fill-independent,
.marker-independent {
  background: var(--independent);
}

.meter-value {
  font-family: "IBM Plex Mono", "Cascadia Mono", monospace;
  font-size: 1.15rem;
  font-variant-numeric: tabular-nums;
}

.meter-track {
  position: relative;
  height: 22px;
  overflow: hidden;
  border: 1px solid #d3d4d1;
  background:
    linear-gradient(90deg, transparent 24.7%, #d6d6d2 25%, transparent 25.3%, transparent 49.7%, #d6d6d2 50%, transparent 50.3%, transparent 74.7%, #d6d6d2 75%, transparent 75.3%),
    #ecece8;
}

.meter-fill {
  position: absolute;
  inset: 0 auto 0 0;
  width: 0%;
  opacity: 0.86;
  transition: width 80ms linear;
}

.meter-marker {
  position: absolute;
  top: -3px;
  bottom: -3px;
  left: 0%;
  width: 3px;
  transform: translateX(-1px);
  box-shadow: 0 0 0 2px rgba(255, 255, 255, 0.7);
  transition: left 80ms linear;
}

.reading-note {
  display: flex;
  flex-wrap: wrap;
  gap: 8px 18px;
  padding-top: 14px;
  border-top: 1px solid var(--line);
  color: var(--muted);
  font-family: "IBM Plex Mono", "Cascadia Mono", monospace;
  font-size: 0.7rem;
}

.video-panel {
  display: flex;
  flex-direction: column;
  padding: 16px;
}

.video-heading {
  align-items: center;
  padding: 2px 4px 13px;
}

.video-stage {
  position: relative;
  flex: 1;
  min-height: 300px;
  overflow: hidden;
  background: #111314;
}

#youtube-player,
#youtube-player iframe {
  display: block;
  width: 100%;
  height: 100%;
  min-height: 300px;
  border: 0;
  background: #111314;
}

.consent-panel {
  display: grid;
  min-height: 300px;
  place-items: center;
  align-content: center;
  gap: 18px;
  padding: 32px;
  background: #111314;
  color: #e7e7e4;
  text-align: center;
}

.consent-panel p {
  max-width: 48ch;
  margin: 0;
  color: #c8cbc8;
  line-height: 1.55;
}

.consent-button {
  min-height: 44px;
  padding: 10px 16px;
  border: 1px solid #e4e5df;
  background: #f4f3ef;
  color: #202124;
  cursor: pointer;
  font-weight: 650;
}

.consent-button:hover {
  background: #ffffff;
}

.consent-button:disabled {
  cursor: wait;
  opacity: 0.65;
}

.consent-links {
  font-size: 0.76rem;
}

.consent-links a,
.site-footer a,
.video-id {
  color: inherit;
  text-underline-offset: 3px;
}

.transport {
  display: grid;
  grid-template-columns: 42px 52px minmax(150px, 1fr) 52px auto;
  align-items: center;
  gap: 12px;
  min-height: 64px;
  margin-top: 12px;
  padding: 10px 14px;
  border: 1px solid var(--line-strong);
  background: #272a2c;
  color: #f4f3ef;
}

.icon-button {
  display: inline-grid;
  width: 40px;
  height: 40px;
  place-items: center;
  border: 1px solid #5e6265;
  border-radius: 50%;
  color: #fff;
  background: transparent;
  cursor: pointer;
}

.icon-button:hover {
  background: #3a3e40;
}

.icon {
  width: 20px;
  height: 20px;
  fill: currentColor;
}

.icon-pause,
.play-button.is-playing .icon-play {
  display: none;
}

.play-button.is-playing .icon-pause {
  display: block;
}

.transport-time {
  font-family: "IBM Plex Mono", "Cascadia Mono", monospace;
  font-size: 0.75rem;
  font-variant-numeric: tabular-nums;
  text-align: center;
}

.seek-slider {
  width: 100%;
  height: 20px;
  margin: 0;
  accent-color: #e1e3df;
  cursor: pointer;
}

.speed-control {
  display: flex;
  align-items: center;
  gap: 8px;
  color: #cfd1ce;
  font-size: 0.75rem;
}

.speed-control select {
  min-width: 74px;
  height: 34px;
  padding: 0 24px 0 9px;
  border: 1px solid #5e6265;
  color: #f4f3ef;
  background: #272a2c;
  cursor: pointer;
}

.chart-panel {
  margin-top: 18px;
  padding: 20px 20px 14px;
}

.chart-heading {
  align-items: flex-end;
  margin-bottom: 12px;
}

.legend {
  display: flex;
  align-items: center;
  justify-content: flex-end;
  gap: 10px 18px;
  flex-wrap: wrap;
  color: #505558;
  font-size: 0.73rem;
}

.legend span {
  display: inline-flex;
  align-items: center;
  white-space: nowrap;
}

.legend-line {
  width: 24px;
  height: 3px;
  margin-right: 7px;
  background: var(--series-color);
}

.legend-line.is-dashed {
  height: 2px;
  background: repeating-linear-gradient(90deg, var(--series-color) 0 7px, transparent 7px 11px);
}

.legend-gt {
  background: var(--gt);
}

.legend-original {
  background: var(--original);
}

.legend-independent {
  background: var(--independent);
}

.legend-feature {
  width: 18px;
  height: 12px;
  margin-right: 7px;
  border: 1px solid var(--feature-color);
}

.legend-feature.is-available {
  background: color-mix(in srgb, var(--feature-color) 22%, transparent);
}

.legend-feature.is-dropped {
  background: color-mix(in srgb, var(--feature-color) 90%, transparent);
}

.chart-resize-handle {
  display: grid;
  place-items: center;
  width: 100%;
  height: 16px;
  padding: 0;
  border: 0;
  color: #74797c;
  background: transparent;
  cursor: ns-resize;
  touch-action: none;
}

.chart-resize-handle span,
.chart-resize-handle span::before,
.chart-resize-handle span::after {
  display: block;
  width: 34px;
  height: 1px;
  background: currentColor;
}

.chart-resize-handle span {
  position: relative;
}

.chart-resize-handle span::before,
.chart-resize-handle span::after {
  position: absolute;
  left: 0;
  content: "";
}

.chart-resize-handle span::before {
  top: -4px;
}

.chart-resize-handle span::after {
  top: 4px;
}

.chart-resize-handle:hover,
.chart-resize-handle:focus-visible,
.chart-resize-handle.is-resizing {
  color: #25282a;
  outline: none;
}

.chart-wrap {
  position: relative;
  width: 100%;
  height: var(--chart-height, clamp(280px, 38vh, 430px));
  min-height: 220px;
  overflow: hidden;
  border: 1px solid var(--line);
  background: #fff;
  cursor: crosshair;
  touch-action: none;
}

#salience-chart {
  display: block;
  width: 100%;
  height: 100%;
}

.chart-tooltip {
  position: absolute;
  z-index: 3;
  min-width: 92px;
  padding: 7px 9px;
  border: 1px solid #b9bbb8;
  background: rgba(255, 255, 255, 0.96);
  box-shadow: 0 5px 16px rgba(32, 33, 36, 0.13);
  color: var(--ink);
  font-family: "IBM Plex Mono", "Cascadia Mono", monospace;
  font-size: 0.68rem;
  line-height: 1.5;
  pointer-events: none;
}

.chart-hint {
  margin-top: 9px;
  color: var(--muted);
  font-size: 0.72rem;
  text-align: right;
}

.error-banner {
  margin: 14px 0 0;
  padding: 11px 13px;
  border: 1px solid #c98374;
  background: #fff1ed;
  color: #7b2f20;
  font-size: 0.82rem;
}

.site-footer {
  display: flex;
  align-items: flex-start;
  justify-content: space-between;
  gap: 20px;
  margin-top: 18px;
  padding: 15px 2px 0;
  border-top: 1px solid var(--line-strong);
  color: var(--muted);
  font-size: 0.74rem;
  line-height: 1.5;
}

.site-footer nav {
  display: flex;
  justify-content: flex-end;
  gap: 8px 16px;
  flex-wrap: wrap;
}

.legal-page {
  width: min(760px, calc(100% - 32px));
  margin: 0 auto;
  padding: 48px 0 64px;
}

.legal-page h1 {
  margin-bottom: 28px;
}

.legal-page h2 {
  margin: 28px 0 8px;
}

.legal-page p,
.legal-page li {
  line-height: 1.65;
}

.legal-page a {
  color: #245f7c;
}

@media (max-width: 980px) {
  .app-shell {
    width: min(100% - 24px, 820px);
    padding-top: 20px;
  }

  .upper-grid {
    grid-template-columns: 1fr;
  }

  .demo-navigation,
  .demo-summary {
    align-items: flex-start;
    flex-direction: column;
  }

  .demo-navigation {
    padding: 12px 0;
  }

  .tab-list {
    min-height: 42px;
    align-self: auto;
  }

  .demo-summary {
    display: flex;
    gap: 8px;
  }

  .metric-strip {
    width: 100%;
    grid-template-columns: repeat(4, minmax(0, 1fr));
  }

  .metric-definition {
    grid-column: 1 / -1;
    border-right: 0 !important;
    border-bottom: 1px solid var(--line);
  }

  .salience-panel,
  .video-panel {
    min-height: auto;
  }

  .meters {
    margin: 20px 0;
  }

  .video-stage,
  #youtube-player,
  #youtube-player iframe,
  .consent-panel {
    min-height: 260px;
  }

  .chart-heading {
    align-items: flex-start;
    flex-direction: column;
  }

  .legend {
    justify-content: flex-start;
  }
}

@media (max-width: 640px) {
  .app-shell {
    width: 100%;
    padding: 14px 10px 24px;
  }

  .app-header {
    align-items: flex-start;
    flex-direction: column;
    gap: 14px;
  }

  .status-cluster {
    justify-content: flex-start;
  }

  .demo-options {
    width: 100%;
    align-items: flex-start;
    flex-direction: column;
  }

  .video-picker {
    width: 100%;
  }

  .video-button {
    flex: 1;
    min-width: 0;
  }

  .metric-strip {
    grid-template-columns: repeat(2, 1fr);
  }

  .metric-value:nth-of-type(odd) {
    border-right: 0;
  }

  .metric-value:nth-of-type(2),
  .metric-value:nth-of-type(3) {
    border-bottom: 1px solid var(--line);
  }

  .salience-panel,
  .video-panel,
  .chart-panel {
    box-shadow: none;
  }

  .salience-panel {
    padding: 16px;
  }

  .video-panel {
    padding: 10px;
  }

  .video-heading {
    align-items: flex-start;
  }

  .video-stage,
  #youtube-player,
  #youtube-player iframe,
  .consent-panel {
    min-height: 210px;
  }

  .transport {
    grid-template-columns: 42px 1fr auto;
    gap: 8px 10px;
  }

  .transport-time {
    display: none;
  }

  .speed-control span {
    display: none;
  }

  .chart-panel {
    padding: 16px 10px 12px;
  }

  .chart-wrap {
    height: var(--chart-height, 310px);
  }

  .legend {
    gap: 8px 12px;
  }

  .site-footer {
    flex-direction: column;
  }

  .site-footer nav {
    justify-content: flex-start;
  }
}

@media (prefers-reduced-motion: reduce) {
  .meter-fill,
  .meter-marker {
    transition: none;
  }
}