:root {
  --ink: #202020;
  --muted: #555555;
  --faint: #8a8a8a;
  --line: #dedede;
  --soft: #f6f6f6;
  --accent: #eb1000;
  --accent-soft: #fff4f2;
  --transcribed: #1747c7;
  --inferred: #c4140c;
  --sans: "Helvetica Neue", Helvetica, Arial, sans-serif;
  --mono: ui-monospace, SFMono-Regular, Menlo, Consolas, monospace;
}

* { box-sizing: border-box; }

html { scroll-behavior: smooth; }

@media (prefers-reduced-motion: reduce) {
  html { scroll-behavior: auto; }
}

body {
  margin: 0;
  background: #fff;
  color: var(--ink);
  font: 16px/1.6 var(--sans);
  -webkit-font-smoothing: antialiased;
  text-rendering: optimizeLegibility;
}

a { color: inherit; text-underline-offset: 2px; }
a:hover { color: var(--accent); }

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

svg { fill: none; stroke: currentColor; stroke-width: 2; stroke-linecap: round; stroke-linejoin: round; }
svg .fill { fill: currentColor; stroke: none; }

.wrap { width: min(1120px, 100% - 40px); margin-inline: auto; }
.narrow { width: min(840px, 100% - 40px); margin-inline: auto; }

/* ---------- Header ---------- */

.hero { padding: 76px 0 28px; text-align: center; }

.hero h1 {
  margin: 0 auto;
  max-width: 1080px;
  font-size: clamp(1.8rem, 3.6vw, 2.6rem);
  line-height: 1.14;
  font-weight: 700;
  letter-spacing: -0.035em;
  text-wrap: balance;
}

.hero h1 .accent { color: var(--accent); white-space: nowrap; }

.authors {
  margin: 30px auto 0;
  max-width: 1000px;
  font-size: 1.14rem;
  line-height: 1.9;
  text-wrap: balance;
}

.author { display: inline-block; margin: 0 0.5em; white-space: nowrap; }
.author a { text-decoration: none; border-bottom: 1px solid transparent; transition: border-color 0.15s, color 0.15s; }
.author a:hover { border-bottom-color: currentColor; }
.author sup, .affiliations sup, .footnote sup { font-size: 0.7em; margin-left: 1px; }

.affiliations { margin: 4px 0 0; color: var(--muted); }
.affiliations span { display: inline-block; margin: 0 0.75em; }

.footnote { margin: 4px 0 0; color: var(--faint); font-size: 0.86rem; }

.venue {
  display: inline-block;
  margin: 18px 0 0;
  padding: 4px 14px;
  border: 1px solid var(--accent);
  border-radius: 999px;
  color: var(--accent);
  font-size: 0.9rem;
  font-weight: 600;
  letter-spacing: 0.01em;
}

.links { display: flex; flex-wrap: wrap; justify-content: center; gap: 10px; margin-top: 22px; }

.button {
  display: inline-flex;
  align-items: center;
  gap: 8px;
  padding: 9px 18px;
  border: 1px solid var(--ink);
  border-radius: 999px;
  color: var(--ink);
  font-size: 0.95rem;
  font-weight: 600;
  text-decoration: none;
  transition: background 0.15s, color 0.15s;
}

.button svg { width: 17px; height: 17px; }
.button:hover, .button:focus-visible { background: var(--ink); color: #fff; }

.headphones {
  display: inline-flex;
  align-items: center;
  gap: 7px;
  margin: 20px 0 0;
  color: var(--muted);
  font-size: 0.9rem;
}

.headphones svg { width: 16px; height: 16px; }

/* ---------- Sections ---------- */

.section { padding: 36px 0; }

h2 {
  margin: 0 0 18px;
  font-size: 1.75rem;
  line-height: 1.2;
  font-weight: 700;
  letter-spacing: -0.025em;
}

h2::before {
  content: "";
  display: block;
  width: 36px;
  height: 3px;
  margin-bottom: 14px;
  background: var(--accent);
}

#abstract p { margin: 0; font-size: 1.04rem; line-height: 1.7; }

.video-frame {
  position: relative;
  aspect-ratio: 16 / 9;
  overflow: hidden;
  border-radius: 12px;
  background: #151515;
}

.video-frame iframe, .video-frame video { position: absolute; inset: 0; width: 100%; height: 100%; border: 0; }

.video-placeholder {
  display: flex;
  flex-direction: column;
  align-items: center;
  justify-content: center;
  gap: 14px;
  color: #d9d9d9;
  font-size: 0.98rem;
  letter-spacing: 0.02em;
  background:
    radial-gradient(120% 90% at 50% 120%, rgba(235, 16, 0, 0.22), transparent 60%),
    #151515;
}

.video-placeholder svg { width: 64px; height: 64px; stroke-width: 1.6; opacity: 0.9; }

.bibtex { position: relative; }

.bibtex pre {
  margin: 0;
  padding: 18px 20px;
  overflow-x: auto;
  border: 1px solid var(--line);
  border-radius: 10px;
  background: var(--soft);
  font: 13.5px/1.6 var(--mono);
}

.copy {
  position: absolute;
  top: 10px;
  right: 10px;
  padding: 5px 12px;
  border: 1px solid var(--line);
  border-radius: 999px;
  background: #fff;
  color: var(--ink);
  font: 600 0.8rem var(--sans);
  cursor: pointer;
}

.copy:hover { border-color: var(--ink); }

/* ---------- Example legend ---------- */

.intro { margin: 0 0 14px; color: var(--muted); }
.intro.small { margin-top: 14px; font-size: 0.9rem; }

.legend {
  display: grid;
  grid-template-columns: repeat(3, minmax(0, 1fr));
  gap: 22px;
  margin: 0;
}

.legend > div { padding-top: 10px; border-top: 2px solid var(--ink); }
.legend > .ours { border-top-color: var(--accent); }
.legend dt { font-weight: 700; }
.legend dd { margin: 3px 0 0; color: var(--muted); font-size: 0.92rem; line-height: 1.5; }

.tag {
  display: inline-block;
  margin-left: 4px;
  padding: 1px 7px;
  border-radius: 999px;
  background: var(--accent);
  color: #fff;
  font-size: 0.68rem;
  font-weight: 700;
  letter-spacing: 0.06em;
  text-transform: uppercase;
  vertical-align: 2px;
}

/* ---------- Example cards ---------- */

.examples { margin-top: 8px; }

.example { padding: 34px 0 30px; border-top: 1px solid var(--line); }
.examples > .example:first-child { margin-top: 18px; }

.kicker {
  margin: 0 0 8px;
  color: var(--accent);
  font-size: 0.78rem;
  font-weight: 700;
  letter-spacing: 0.1em;
  text-transform: uppercase;
}

.prompt {
  margin: 0;
  padding: 12px 18px;
  border-left: 3px solid var(--accent);
  background: var(--accent-soft);
  font-size: 1.12rem;
  line-height: 1.5;
}

.systems {
  display: grid;
  grid-template-columns: repeat(3, minmax(0, 1fr));
  gap: 22px;
  margin-top: 20px;
}

.system { min-width: 0; margin: 0; }

.system-label {
  display: flex;
  align-items: baseline;
  justify-content: space-between;
  gap: 8px;
  margin-bottom: 10px;
  padding-top: 8px;
  border-top: 2px solid var(--ink);
}

.system[data-system="ours"] .system-label { border-top-color: var(--accent); }
.system-name { font-weight: 700; }
.system-cond { color: var(--faint); font-size: 0.82rem; white-space: nowrap; }

.spec {
  position: relative;
  aspect-ratio: 640 / 220;
  overflow: hidden;
  border-radius: 6px;
  background: #000004;
  cursor: pointer;
}

.spec img { display: block; width: 100%; height: 100%; object-fit: cover; }

.playhead {
  position: absolute;
  top: 0;
  bottom: 0;
  left: 0;
  width: 2px;
  margin-left: -1px;
  background: #fff;
  box-shadow: 0 0 6px rgba(255, 255, 255, 0.8);
  opacity: 0;
  pointer-events: none;
  transition: opacity 0.2s;
}

.spec.is-active .playhead { opacity: 1; }

.system audio { display: block; width: 100%; height: 40px; margin-top: 10px; }

.scores { display: grid; grid-template-columns: repeat(3, minmax(0, 1fr)); margin: 10px 0 0; }
.scores > div { padding-top: 6px; border-top: 1px solid var(--line); }
.scores dt { color: var(--faint); font-size: 0.72rem; letter-spacing: 0.06em; text-transform: uppercase; }
.scores dd { margin: 0; color: var(--muted); font-variant-numeric: tabular-nums; }
.scores dd.best { color: var(--ink); font-weight: 700; }

/* ---------- Collapsible panels ---------- */

.panel { margin-top: 16px; border: 1px solid var(--line); border-radius: 10px; }
.panel + .panel { margin-top: 10px; }

.panel > summary {
  display: flex;
  flex-wrap: wrap;
  align-items: center;
  gap: 6px 12px;
  padding: 11px 16px;
  font-weight: 600;
  cursor: pointer;
  list-style: none;
}

.panel > summary::-webkit-details-marker { display: none; }

.panel > summary::before {
  content: "";
  width: 7px;
  height: 7px;
  margin: 0 4px 0 2px;
  border-right: 2px solid currentColor;
  border-bottom: 2px solid currentColor;
  transform: rotate(-45deg);
  transition: transform 0.15s;
}

.panel[open] > summary::before { transform: rotate(45deg); }
.panel > summary:hover { color: var(--accent); }

.color-key { margin-left: auto; color: var(--muted); font-size: 0.84rem; font-weight: 400; }
.color-key span { margin-left: 12px; white-space: nowrap; }
.color-key span::before { content: ""; display: inline-block; width: 9px; height: 9px; margin-right: 5px; border-radius: 2px; background: currentColor; }

.panel-body { padding: 0 16px 14px; overflow-x: auto; }

.t { color: var(--transcribed); }
.i { color: var(--inferred); }
.empty { color: var(--faint); }

.scap-table, .dsg-table { width: 100%; border-collapse: collapse; font-size: 0.92rem; line-height: 1.45; }

.scap-table th, .scap-table td, .dsg-table th, .dsg-table td {
  padding: 8px 14px 8px 0;
  border-top: 1px solid var(--line);
  text-align: left;
  vertical-align: top;
}

.scap-table thead th, .dsg-table thead th { border-top: 0; color: var(--muted); font-size: 0.8rem; font-weight: 400; }
.scap-table tbody th { width: 16%; font-weight: 400; white-space: nowrap; }
.scap-table tbody th code { color: var(--muted); font: 0.84rem var(--mono); }
.scap-table td { width: 42%; }

.dsg-table { min-width: 640px; }
.dsg-table tbody th { font-weight: 400; }
.dsg-table td { width: 17%; min-width: 108px; }
.qid { margin-right: 8px; color: var(--faint); font-size: 0.8rem; font-variant-numeric: tabular-nums; }
.qtype { margin-left: 6px; color: var(--faint); font-size: 0.7rem; letter-spacing: 0.06em; text-transform: uppercase; white-space: nowrap; }
.dep { color: var(--faint); font-size: 0.8rem; white-space: nowrap; }

.ans { display: flex; justify-content: space-between; gap: 8px; font-variant-numeric: tabular-nums; }
.ans b { font-weight: 600; }
.ans.no b { color: var(--faint); }
.ans span { color: var(--muted); }

.bar { height: 4px; margin-top: 5px; overflow: hidden; border-radius: 2px; background: #ececec; }
.bar i { display: block; height: 100%; background: var(--ink); }
[data-system="ours"] .bar i { background: var(--accent); }

.dsg-table tfoot th, .dsg-table tfoot td { border-top: 2px solid var(--ink); font-variant-numeric: tabular-nums; }
.dsg-table tfoot td { color: var(--muted); }
.dsg-table tfoot td.best { color: var(--ink); font-weight: 700; }

.table-note { margin: 10px 0 0; color: var(--faint); font-size: 0.8rem; }

/* ---------- Footer ---------- */

.footer { margin-top: 24px; padding: 26px 0 40px; border-top: 1px solid var(--line); color: var(--faint); font-size: 0.85rem; text-align: center; }
.footer p { margin: 0; }

/* ---------- Small screens ---------- */

@media (max-width: 900px) {
  .br-wide { display: none; }
}

@media (max-width: 760px) {
  .hero { padding-top: 48px; }
  .author { margin: 0 0.35em; }
  .legend, .systems { grid-template-columns: 1fr; }
  .systems { gap: 26px; }
  .color-key { margin-left: 0; }
  .color-key span:first-child { margin-left: 0; }

  /* Stack table rows: label on its own line, values in a grid below. */
  .scap-table, .scap-table thead, .scap-table tbody,
  .dsg-table, .dsg-table tbody, .dsg-table tfoot { display: block; }
  .scap-table tr, .dsg-table tr {
    display: grid;
    column-gap: 12px;
    padding: 8px 0;
    border-top: 1px solid var(--line);
  }
  .scap-table tr { grid-template-columns: repeat(2, minmax(0, 1fr)); }
  .dsg-table tr { grid-template-columns: repeat(3, minmax(0, 1fr)); }
  .scap-table thead tr { border-top: 0; padding-top: 0; }
  .scap-table thead th:first-child, .dsg-table thead { display: none; }
  .scap-table th, .scap-table td, .dsg-table th, .dsg-table td { width: auto; min-width: 0; padding: 0; border-top: 0; }
  .scap-table tbody th, .dsg-table tbody th, .dsg-table tfoot th { grid-column: 1 / -1; padding-bottom: 5px; }
  .dsg-table { min-width: 0; }
  .dsg-table tfoot tr { border-top: 2px solid var(--ink); }
  .dsg-table tfoot th, .dsg-table tfoot td { border-top: 0; }
  .dsg-table td::before {
    content: attr(data-label);
    display: block;
    margin-bottom: 2px;
    color: var(--faint);
    font-size: 0.7rem;
    font-weight: 400;
    white-space: nowrap;
    overflow: hidden;
    text-overflow: ellipsis;
  }
  .ans { flex-wrap: wrap; column-gap: 6px; }
}