:root {
  --ink: #1f2328;
  --muted: #5f6670;
  --line: #e1e4e8;
  --tint: #f6f8fa;
  --accent: #2b7bc6;
  --ours: #eaf3fc;
  --max: 960px;
  --sans: "Inter", -apple-system, BlinkMacSystemFont, "Segoe UI", sans-serif;
  --serif: "Source Serif 4", Georgia, serif;
}

* { box-sizing: border-box; }
html { scroll-behavior: smooth; }
body { margin: 0; color: var(--ink); background: #fff; font: 16px/1.65 var(--sans); }
img, video { display: block; max-width: 100%; height: auto; }
a { color: var(--accent); text-decoration: none; }
a:hover { text-decoration: underline; }

.hero, main, footer { width: min(100% - 32px, var(--max)); margin-inline: auto; }

/* ---------- Hero ---------- */
.hero { padding: 64px 0 28px; text-align: center; }
.venue { display: inline-block; margin: 0 0 14px; padding: 4px 12px; border-radius: 999px; background: var(--ours); color: var(--accent); font-size: .78rem; font-weight: 600; letter-spacing: .06em; text-transform: uppercase; }
h1 { max-width: 940px; margin: 0 auto 22px; font: 600 clamp(1.9rem, 4.4vw, 3.1rem)/1.15 var(--serif); letter-spacing: -.02em; }
.accent { color: var(--accent); }
.authors { display: flex; flex-wrap: wrap; justify-content: center; gap: .25rem 1.4rem; margin: 0; font-size: 1.05rem; font-weight: 500; }
.authors a { color: var(--ink); }
.authors a:hover { color: var(--accent); }
.affiliation { margin: 4px 0 0; color: var(--muted); }
.affiliation.note { font-size: .85rem; }
.authors sup, .affiliation sup { font-size: .7em; }

.links { display: flex; flex-wrap: wrap; justify-content: center; gap: 10px; margin-top: 26px; }
.btn { display: inline-flex; align-items: center; gap: 7px; padding: 8px 18px; border-radius: 999px; background: #24292f; color: #fff; font-size: .9rem; font-weight: 500; }
.btn svg { width: 16px; height: 16px; fill: currentColor; }
a.btn:hover { background: var(--accent); text-decoration: none; }
.btn.disabled { opacity: .45; cursor: default; }

/* ---------- Sections ---------- */
section { padding: 44px 0 8px; }
h2 { margin: 0 0 18px; font: 600 clamp(1.6rem, 3vw, 2.1rem)/1.2 var(--serif); text-align: center; }
h3 { margin: 0 0 6px; font-size: 1rem; line-height: 1.35; }
section { counter-reset: sub; }
.sub { display: flex; align-items: center; gap: 12px; margin: 48px 0 8px; font: 600 1.4rem/1.25 var(--serif); letter-spacing: -.01em; counter-increment: sub; }
.sub::before { content: counter(sub, decimal-leading-zero); flex: none; display: grid; place-items: center; width: 34px; height: 34px; border-radius: 50%; background: var(--accent); color: #fff; font: 600 .78rem var(--sans); letter-spacing: .02em; }
.sub::after { content: ""; flex: 1; height: 1px; background: linear-gradient(90deg, var(--accent), var(--line) 30%, transparent); opacity: .7; }
.sub + .lead { padding-left: 46px; }
.lead { margin: 0 0 18px; color: var(--muted); font-size: 1.02rem; }
.lead strong { color: var(--ink); }

figure { margin: 24px 0; }
figcaption, .cap { margin: 10px 0 0; color: var(--muted); font-size: .88rem; }
.cap.center, .pair figcaption, .vgrid figcaption { text-align: center; }
.pair { display: grid; grid-template-columns: 1fr 1fr; gap: 24px; }
.pair figure { margin: 0; }

.cards { display: grid; margin-top: 8px; grid-template-columns: repeat(3, 1fr); gap: 16px; }
.cards article { padding: 20px; border: 1px solid var(--line); border-radius: 10px; }
.cards .num { display: block; margin-bottom: 6px; color: var(--accent); font: 600 1.3rem/1 var(--serif); }
.cards p { margin: 0; color: var(--muted); font-size: .92rem; }

.stats { display: grid; grid-template-columns: repeat(3, 1fr); gap: 16px; margin-bottom: 28px; }
.stats div { padding: 20px; border-radius: 10px; background: var(--tint); text-align: center; }
.stats strong { display: block; color: var(--accent); font: 600 2.2rem/1.2 var(--serif); }
.stats span { color: var(--muted); font-size: .85rem; }

/* ---------- Video ---------- */
video { width: 100%; border-radius: 8px; background: var(--tint); }

.tabs { display: flex; flex-wrap: wrap; gap: 6px; margin: 0 0 12px; }
.tabs button { padding: 6px 14px; border: 1px solid var(--line); border-radius: 999px; background: #fff; color: var(--ink); font: 500 .85rem var(--sans); cursor: pointer; }
.tabs button:hover { border-color: var(--accent); }
.tabs button[aria-selected="true"] { border-color: var(--accent); background: var(--accent); color: #fff; }

.vgrid { display: grid; gap: 14px; }
.vgrid.two { grid-template-columns: repeat(2, 1fr); }
.vgrid.three { grid-template-columns: repeat(3, 1fr); }
.vgrid.five { grid-template-columns: repeat(5, 1fr); gap: 10px; }
.vgrid figure { margin: 0; }
.vgrid figcaption { margin-top: 6px; text-align: center; font-size: .85rem; }
.vgrid figcaption b { color: var(--ink); }
.label { display: inline-block; padding: 1px 9px; border-radius: 999px; font-size: .78rem; font-weight: 600; }
.label.good { background: #e3f4e8; color: #1a7f37; }
.label.bad { background: #fdecea; color: #b42318; }
.label.neutral { background: var(--tint); color: var(--muted); }

.utterance { margin: 0 0 12px; color: var(--muted); text-align: center; font: italic 1.05rem var(--serif); }
.sync { display: flex; justify-content: center; margin-top: 12px; }
.sync button { padding: 6px 16px; border: 1px solid var(--line); border-radius: 999px; background: #fff; font: 500 .85rem var(--sans); cursor: pointer; }
.sync button:hover { border-color: var(--accent); color: var(--accent); }

/* ---------- Method callouts ---------- */
.abstract { margin: 0 0 22px; }
.abstract summary { color: var(--accent); font-size: .9rem; font-weight: 500; cursor: pointer; }
.abstract p { margin: 10px 0 0; color: var(--muted); font-size: .93rem; }
.duo { display: grid; grid-template-columns: 1fr 1fr; gap: 16px; margin-bottom: 8px; }
.duo div { display: flex; flex-direction: column; gap: 4px; padding: 16px 18px; border-left: 3px solid var(--accent); border-radius: 0 10px 10px 0; background: var(--tint); }
.duo .q { color: var(--accent); font: italic 600 1.15rem var(--serif); }
.duo span:last-child { color: var(--muted); font-size: .92rem; }
.eq { display: flex; flex-wrap: wrap; align-items: flex-start; justify-content: center; gap: 6px 14px; padding: 22px 16px 16px; border-radius: 10px; background: var(--tint); font: 1.25rem var(--serif); }
.eq .term { display: flex; flex-direction: column; align-items: center; font-style: italic; }
.eq small { margin-top: 4px; padding-top: 4px; border-top: 1px solid var(--muted); color: var(--muted); font: 500 .72rem var(--sans); letter-spacing: .04em; text-transform: uppercase; font-style: normal; }
.eq .lang small { border-color: var(--accent); color: var(--accent); }

/* ---------- Tables ---------- */
.table-title { margin: 28px 0 8px; font-size: 1.05rem; }
.table-wrap { overflow-x: auto; margin-bottom: 8px; }
table { width: 100%; border-collapse: collapse; font-size: .9rem; font-variant-numeric: tabular-nums; }
caption { caption-side: bottom; padding-top: 10px; color: var(--muted); font-size: .85rem; text-align: left; }
th, td { padding: 7px 10px; border-bottom: 1px solid var(--line); text-align: center; white-space: nowrap; }
tbody th, th.method { text-align: left; font-weight: 500; }
thead th { background: var(--tint); font-weight: 600; }
.grp { border-left: 1px solid var(--line); }
td .pm { color: var(--muted); font-size: .8em; }
tr.indent th { padding-left: 26px; color: var(--muted); }
tr.ours { background: var(--ours); }
tr.ours th { font-weight: 600; }
tr.ours td { font-weight: 600; }
tr.regime th { background: #fff; color: var(--muted); font-style: italic; font-weight: 500; }

/* ---------- BibTeX ---------- */
.bibtex { position: relative; border-radius: 10px; background: #1f2328; }
.bibtex pre { margin: 0; padding: 20px; overflow-x: auto; color: #e6e8eb; font: .85rem/1.6 ui-monospace, SFMono-Regular, Menlo, monospace; }
.bibtex button { position: absolute; top: 10px; right: 10px; padding: 4px 10px; border: 1px solid #555c66; border-radius: 6px; background: none; color: #fff; font: inherit; font-size: .8rem; cursor: pointer; }

footer { padding: 40px 0; color: var(--muted); font-size: .8rem; text-align: center; }
footer p { margin: 4px 0; }

@media (max-width: 900px) {
  .vgrid.five { grid-template-columns: repeat(3, 1fr); }
}
@media (max-width: 760px) {
  .sub + .lead { padding-left: 0; }
  .hero { padding-top: 40px; }
  .cards, .stats, .pair, .duo, .vgrid.two, .vgrid.three { grid-template-columns: 1fr; }
  .vgrid.five { grid-template-columns: repeat(2, 1fr); }
}