:root {
  --text: #363636;
  --muted: #7a7a7a;
  --accent: #e8741a;
  --border: #e5e5e5;
  --border-soft: #dbdbdb;
  --fill: #f5f5f5;
  --track: #f0f0f0;
  --link: #3273dc;
}

* { box-sizing: border-box; }

html, body {
  margin: 0;
  padding: 0;
  background: #fff;
  color: var(--text);
  font-family: 'Noto Sans', 'Helvetica Neue', Helvetica, Arial, sans-serif;
  -webkit-font-smoothing: antialiased;
}

a { color: var(--link); text-decoration: none; }
a:hover { color: var(--text); text-decoration: underline; }
p { text-wrap: pretty; }
video, img { display: block; }
button { font-family: inherit; }

.container {
  max-width: 960px;
  margin: 0 auto;
  padding: 0 24px 80px;
  font-size: 17px;
  line-height: 1.55;
}

/* Header */
.site-header {
  text-align: center;
  padding: 64px 0 24px;
  display: flex;
  flex-direction: column;
  align-items: center;
  gap: 14px;
}
.site-header h1 {
  font-weight: 700;
  font-size: 44px;
  line-height: 1.15;
  margin: 0;
  letter-spacing: -0.01em;
  max-width: 860px;
  text-wrap: balance;
}
.affiliation { font-size: 20px; }
.date { font-size: 15px; color: var(--muted); }
.links {
  display: flex;
  gap: 8px;
  flex-wrap: wrap;
  justify-content: center;
  margin-top: 6px;
}
.pill {
  display: inline-flex;
  align-items: center;
  padding: 8px 20px;
  border-radius: 999px;
  background: var(--text);
  color: #fff;
  font-size: 15px;
}
.pill:hover { background: #000; color: #fff; text-decoration: none; }

.teaser { width: 100%; height: auto; margin-top: 16px; }

.intro {
  font-size: 21px;
  font-weight: 600;
  line-height: 1.45;
  text-align: center;
  margin: 36px auto 0;
  max-width: 880px;
  text-wrap: balance;
}

/* Sections */
section { margin-top: 80px; }
#method, #results { margin-top: 72px; }
#bibtex { margin-top: 64px; }

h2 { font-weight: 700; font-size: 30px; margin: 0 0 8px; }
#contributors h2 { margin-bottom: 16px; }
h3 { font-weight: 600; font-size: 22px; margin: 52px 0 6px; }
h3.first { margin-top: 44px; }

.lead { margin: 0 0 14px; }
.lead.tight { margin: 0; }
#results .lead { margin-bottom: 24px; }
#drivevfm .lead { margin-bottom: 20px; }

.figure { width: 100%; height: auto; border-radius: 4px; }
.diagram { width: 100%; height: auto; margin-top: 24px; }
#drivevfm .diagram { margin-top: 0; }
.after-figure { margin: 20px 0 0; }

.parts { margin: 0; padding-left: 22px; }
.parts li { margin: 0 0 10px; padding-left: 4px; }
.parts li:last-child { margin-bottom: 0; }

.footnote { margin: 16px 0 0; font-size: 13px; color: var(--muted); }

/* Result charts */
.charts {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 28px 40px;
}
.chart-head {
  display: flex;
  justify-content: space-between;
  align-items: baseline;
  border-bottom: 2px solid var(--text);
  padding-bottom: 6px;
  margin-bottom: 10px;
}
.chart-head strong { font-size: 16px; }
.chart-head span { font-size: 13px; color: var(--muted); }
.chart-rows { display: flex; flex-direction: column; gap: 5px; }
.chart-row {
  display: grid;
  grid-template-columns: 128px 1fr 44px;
  align-items: center;
  gap: 10px;
  font-size: 13px;
}
.chart-row .name {
  text-align: right;
  white-space: nowrap;
  overflow: hidden;
  text-overflow: ellipsis;
}
.chart-row .track {
  height: 14px;
  background: var(--track);
  border-radius: 2px;
  position: relative;
}
.chart-row .bar {
  position: absolute;
  left: 0; top: 0; bottom: 0;
  border-radius: 2px;
  background: #c8c8c8;
}
.chart-row .value { font-variant-numeric: tabular-nums; }
.chart-row.ref .bar { background: #8a8a8a; }
.chart-row.ours .bar { background: var(--accent); }
.chart-row.ours .name,
.chart-row.ours .value { color: var(--accent); font-weight: 600; }

/* Legend */
.legend {
  display: flex;
  flex-wrap: wrap;
  gap: 6px 18px;
  margin: 0 0 14px;
  font-size: 13px;
  color: var(--muted);
}
.legend span { display: inline-flex; align-items: center; gap: 6px; white-space: nowrap; }
.legend .sw {
  display: inline-block;
  width: 22px;
  height: 11px;
  border-radius: 2px;
}
.legend .sw.dashed {
  background: transparent;
  border: 1.5px dashed #b8c08c;
  box-sizing: border-box;
}

/* Media grids */
.stack { display: flex; flex-direction: column; gap: 20px; }
.stack-16 { display: flex; flex-direction: column; gap: 16px; }
figure { margin: 0; }
.grid-3, .grid-2 { display: grid; gap: 6px; }
.grid-3 { grid-template-columns: 1fr 1fr 1fr; }
.grid-2 { grid-template-columns: 1fr 1fr; }
.grid-3 img, .grid-2 img { width: 100%; height: auto; border-radius: 3px; }
figcaption {
  display: grid;
  gap: 6px;
  font-size: 14px;
  color: var(--muted);
  margin-top: 6px;
  text-align: center;
}
figcaption.cols-3 { grid-template-columns: 1fr 1fr 1fr; }
figcaption.cols-2 { grid-template-columns: 1fr 1fr; }
.pairs { display: grid; grid-template-columns: 1fr 1fr; gap: 20px; }
.side-by-side { display: grid; grid-template-columns: 1fr 1fr; gap: 16px; }
.side-by-side img, .full { width: 100%; height: auto; }

.video-wide {
  width: 100%;
  aspect-ratio: 16 / 9;
  background: #000;
  border-radius: 4px;
}

/* Cards / toolbars */
.card { border: 1px solid var(--border); border-radius: 4px; overflow: hidden; }
.card > img { width: 100%; height: auto; }
.toolbar {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 16px;
  padding: 10px 14px;
  flex-wrap: wrap;
}
.toolbar.bottom { border-top: 1px solid var(--border); }
.toolbar.top { border-bottom: 1px solid var(--border); }
.toolbar .label { font-size: 14px; color: var(--muted); }
.tabs { display: flex; gap: 4px; }
.tab {
  border-radius: 999px;
  border: 1px solid var(--border-soft);
  background: transparent;
  color: var(--text);
  font: 600 13px 'Noto Sans', sans-serif;
  cursor: pointer;
  padding: 0;
}
.tab.round { width: 30px; height: 30px; }
.tab.wide { padding: 5px 14px; }
.tab.active { background: var(--text); color: #fff; border-color: var(--text); }

.compare {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 14px;
  padding: 14px;
}
.compare .title { font-weight: 600; font-size: 16px; margin-bottom: 8px; }
.compare .ours { color: var(--accent); }
.compare video {
  width: 100%;
  aspect-ratio: 16 / 9;
  background: #000;
  border-radius: 3px;
}
.metrics { display: flex; gap: 20px; margin-top: 8px; font-size: 14px; color: var(--muted); }
.metrics strong { color: var(--text); }
.metrics.ours strong { color: var(--accent); }

/* Contributors */
.contributors {
  margin: 0;
  display: grid;
  grid-template-columns: 200px 1fr;
  gap: 10px 24px;
  font-size: 16px;
}
.contributors dt { font-weight: 600; }
.contributors dd { margin: 0; }
.note { margin: 14px 0 0; font-size: 14px; color: var(--muted); }

/* BibTeX */
.bib-head {
  display: flex;
  justify-content: space-between;
  align-items: baseline;
  margin-bottom: 12px;
}
.bib-head h2 { margin: 0; }
.copy-btn {
  padding: 6px 14px;
  border-radius: 999px;
  border: 1px solid var(--text);
  background: transparent;
  color: var(--text);
  font: 600 13px 'Noto Sans', sans-serif;
  cursor: pointer;
}
.copy-btn:hover { background: var(--text); color: #fff; }
pre {
  margin: 0;
  padding: 18px 20px;
  background: var(--fill);
  border-radius: 4px;
  font-family: ui-monospace, Menlo, Consolas, monospace;
  font-size: 13.5px;
  line-height: 1.6;
  overflow-x: auto;
  white-space: pre;
}

footer {
  margin-top: 64px;
  padding-top: 20px;
  border-top: 1px solid var(--border);
  font-size: 14px;
  color: var(--muted);
  text-align: center;
}

/* Responsive */
@media (max-width: 720px) {
  .container { font-size: 16px; }
  .site-header h1 { font-size: 32px; }
  .intro { font-size: 18px; }
  h2 { font-size: 26px; }
  h3 { font-size: 20px; }
  .charts, .pairs, .side-by-side, .compare { grid-template-columns: 1fr; }
  .chart-row { grid-template-columns: 104px 1fr 40px; }
  .contributors { grid-template-columns: 1fr; gap: 2px 0; }
  .contributors dd { margin-bottom: 8px; }
}