/* Editorial research layout: typographic hierarchy, hairline rules, no decorative surfaces.
   Loaded after style.css and research.css; overrides only. */
@import url("https://fonts.googleapis.com/css2?family=Source+Serif+4:opsz,wght@8..60,500;8..60,600&family=JetBrains+Mono:wght@400;500&display=swap");

:root {
  --ink: #1b1c22;
  --muted: #5f6168;
  --accent: #4b43a8;
  --accent-dark: #372f85;
  --line: #d8d8dc;
  --rule: #1b1c22;
  --soft: #f4f4f1;
  --lavender: #f1f0f7;
  --bg: #fcfcfa;
  --serif: "Source Serif 4", "Iowan Old Style", Georgia, serif;
  --mono: "JetBrains Mono", ui-monospace, SFMono-Regular, Menlo, monospace;
  --heading: var(--serif);
}
body { background: var(--bg); color: var(--ink); font-size: 15px; line-height: 1.6; }
.wrap { width: min(1120px, calc(100% - 64px)); }
a { color: var(--accent); text-decoration-thickness: 1px; text-underline-offset: 2px; }

/* ---------- type ---------- */
h1, h2, h3, h4, .display-title { font-family: var(--serif); letter-spacing: 0; font-weight: 500; }
h2 { font-size: clamp(26px, 2.6vw, 32px); line-height: 1.2; margin: 8px 0 0; }
h3 { font-size: 21px; line-height: 1.3; font-weight: 500; }
h4 { font-size: 16px; }
.eyebrow, .margin-label, .evidence-label, .finding-index, .finding-number, .reference-number, .feature-index, .precision-tag, .showcase-group-count, .dense-count {
  font-family: var(--mono); font-size: 11px; font-weight: 500; letter-spacing: 0.08em; text-transform: uppercase; color: var(--muted);
}
.evidence-label, .finding-number { color: var(--accent); }
strong { font-weight: 600; }
.small-note, .table-note, figcaption { font-size: 12px; line-height: 1.6; color: var(--muted); }
table { font-variant-numeric: tabular-nums; }
.metrics-scroll table, .ready-comparison table, .table-wrap table { font-family: var(--font); font-size: 12.5px; }
.metrics-scroll th, .ready-comparison th { font-weight: 600; }

/* ---------- header / nav ---------- */
.site-header { background: rgba(252, 252, 250, 0.94); backdrop-filter: blur(8px); border-bottom: 1px solid var(--line); }
.nav { height: 60px; }
.wordmark { font: 500 18px var(--serif); letter-spacing: 0; display: inline-flex; align-items: center; gap: 9px; color: var(--ink); }
.wordmark > span:first-child { color: var(--ink); }
.nav-links { gap: 22px; font-size: 13px; font-weight: 500; }
.nav-links a { color: var(--ink); text-decoration: none; border-bottom: 1px solid transparent; padding-bottom: 2px; }
.nav-links a:hover { border-bottom-color: var(--ink); }
.home-link { font-family: var(--mono); font-size: 11px; letter-spacing: 0.04em; color: var(--muted); }

/* ---------- hero ---------- */
.hero { padding: 56px 0 40px; text-align: center; border-bottom: 1px solid var(--line); }
.hero-head { max-width: 880px; margin: 0 auto; }
.hero-venue { display: inline-block; margin: 0 0 18px; padding: 6px 12px; font: 600 14px/1.2 var(--font); letter-spacing: 0.02em; color: var(--accent-dark); background: var(--lavender); border: 1px solid rgba(75, 67, 168, 0.3); border-radius: 2px; }
.hero-venue span { color: var(--ink); }
.hero h1 { font-size: clamp(30px, 3.3vw, 42px); line-height: 1.18; font-weight: 500; margin: 0 auto 22px; max-width: 26ch; }
.hero .authors { justify-content: center; margin: 0 0 8px; font-size: 14.5px; font-weight: 500; gap: 4px 18px; }
.hero .authors a { color: var(--ink); text-decoration: none; border-bottom: 1px solid var(--line); }
.hero .authors a.author-lead { color: var(--ink); border-bottom: 1.5px solid var(--ink); font-weight: 600; }
.hero .affiliations { justify-content: center; font-size: 13px; margin: 0; gap: 4px 18px; }
.hero .equal { font-size: 12px; margin: 6px 0 0; }
.hero .actions { justify-content: center; margin: 22px 0 0; gap: 10px; }
.hero-lede { display: grid; grid-template-columns: minmax(0, 1.05fr) minmax(0, 0.95fr); gap: 56px; align-items: start; margin-top: 40px; padding-top: 28px; border-top: 1px solid var(--line); text-align: left; }
.hero-abstract { font-size: 15.5px; line-height: 1.65; margin: 0; max-width: 62ch; }
.hero-abstract strong { font-weight: 600; }
.hero-facts { display: grid; grid-template-columns: 1fr 1fr; gap: 18px 28px; margin: 4px 0 0; }
.hero-facts dt { font-family: var(--mono); font-size: 11px; font-weight: 500; letter-spacing: 0.08em; text-transform: uppercase; color: var(--muted); }
.hero-facts dd { margin: 4px 0 0; font-size: 14px; color: var(--ink); line-height: 1.5; }

/* ---------- buttons / controls ---------- */
.button { border-radius: 2px; font-size: 13px; font-weight: 500; padding: 9px 14px; min-height: 38px; border: 1px solid var(--ink); background: transparent; color: var(--ink); }
.button:hover { background: var(--ink); color: #fff; }
.button.primary { background: var(--ink); color: #fff; }
.button.primary:hover { background: var(--accent-dark); border-color: var(--accent-dark); }
.button.text-button { border-color: transparent; text-decoration: underline; text-underline-offset: 3px; padding-inline: 4px; }
.button.text-button:hover { background: transparent; color: var(--accent); }
.inline-link { font-size: 13px; font-weight: 500; }
.segmented { background: none; border: 0; border-bottom: 1px solid var(--line); border-radius: 0; padding: 0; gap: 0; }
.segmented button { border-radius: 0; padding: 9px 14px; font-size: 13px; border-bottom: 2px solid transparent; margin-bottom: -1px; color: var(--muted); }
.segmented button[aria-pressed="true"] { background: transparent; color: var(--ink); border-bottom-color: var(--ink); }
.group-options button { border-radius: 2px; border: 1px solid var(--line); background: #fff; }
.group-options button[aria-pressed="true"] { border-color: var(--ink); background: var(--ink); color: #fff; }
.group-options button span { background: none; border: 1px solid currentColor; border-radius: 2px; font-family: var(--mono); font-size: 10px; font-weight: 500; letter-spacing: 0.06em; text-transform: uppercase; padding: 1px 6px; }
select, input[type="range"] { accent-color: var(--accent); }
.copy-button { border-radius: 2px; }

/* ---------- section headers ---------- */
.section { padding-top: 56px; padding-bottom: 56px; }
.intro-section, .method-section { background: none; border-block: 0; }
.section-heading { border-top: 2px solid var(--rule); padding-top: 18px; margin-bottom: 34px; align-items: end; }
.section-heading > p { font-size: 14px; max-width: 40ch; margin: 0; color: var(--muted); }
.subsection-heading h3, .paper-table-heading h3 { font-size: 21px; }
.showcase-heading { border-top: 2px solid var(--rule); padding-top: 18px; margin-bottom: 26px; }
.showcase-heading h2 { font-size: clamp(26px, 2.6vw, 32px); }
.showcase-heading p { font-size: 14px; color: var(--muted); }
.showcase-group-head h3 { font-family: var(--serif); font-size: 19px; }
.showcase-group-note { font-size: 13px; color: var(--muted); margin: -6px 0 16px; max-width: 72ch; }

/* ---------- stats (overview) ---------- */
.stats, .research-stats { margin-top: 36px; padding: 22px 0 0; border-top: 1px solid var(--line); border-bottom: 0; gap: 24px; }
.stats strong { font: 500 30px/1.1 var(--serif); letter-spacing: 0; }
.stats strong span { font-size: 18px; color: var(--muted); }
.stats p { font-family: var(--mono); font-size: 11px; letter-spacing: 0.04em; text-transform: uppercase; line-height: 1.6; }
.metric-note { font-size: 12px; color: var(--muted); margin: 12px auto 0; }
.related-list > a { border-top: 1px solid var(--line); padding: 16px 0; color: var(--ink); text-decoration: none; }
.related-list > a:hover h3 { color: var(--accent); }
.related-list h3 { font-size: 16px; }
.related-note { margin-top: 16px; }

/* ---------- figures & cards: rules, not boxes ---------- */
.paper-figure, .attribution-figure a, .structure-figure, .pipeline figure, .grouping-demo, .code-card, .citation-card, .live-gallery, .gallery-cell, .dense-cell, .ready-comparison, .result-highlights article, .projection-chain, .projection-chain > div, .attribution-conclusion, .attribution-findings a, .protocol-details, .algorithm-details, .paper-examples, dialog, .matrix-cell, .image-badge, .precision-tag, .feature-card, .feature-play, .paradigm-tag, .feature-video figcaption {
  border-radius: 2px;
  box-shadow: none;
}
.paper-figure { padding: 0; border: 0; background: none; }
.paper-figure a { border: 1px solid var(--line); display: block; }
.paper-figure figcaption { padding: 10px 0 0; }
.grouping-demo { background: none; border: 0; border-top: 1px solid var(--line); border-bottom: 1px solid var(--line); padding: 34px 0; gap: 56px; }
.grouping-demo > div > .eyebrow { margin-bottom: 14px; }
.grouping-demo #group-description { font-size: 15px; color: var(--ink); min-height: 0; margin: 0 0 20px; }
#examples .video-section { margin-top: 44px; padding-top: 28px; border-top: 1px solid var(--line); }
.attribution-section { background: none; padding: 56px 0 24px; margin-top: 0; border-radius: 0; border-top: 0; }
.attribution-heading { margin-bottom: 28px; }
.takeaway-block { padding: 36px 0 8px; border-top: 1px solid var(--line); }
.takeaway-block > h3 { font-size: 27px; line-height: 1.25; margin: 6px 0 14px; max-width: 40ch; }
.takeaway-block > p { font-size: 15.5px; line-height: 1.7; max-width: 78ch; color: var(--muted); margin: 0 0 14px; }
.takeaway-block > p strong { color: var(--ink); font-weight: 600; }
.takeaway-figure { margin: 22px 0 20px; }
.takeaway-figure a { display: block; border: 1px solid var(--line); background: #fff; padding: 16px; border-radius: 2px; }
.takeaway-figure img { display: block; width: 100%; height: auto; }
.takeaway-figure.narrow a { max-width: 640px; }
.takeaway-figure figcaption { margin-top: 10px; font-size: 12.5px; line-height: 1.6; color: var(--muted); max-width: 96ch; }
.takeaway-figure figcaption strong { color: var(--ink); }
.takeaway-box { margin: 22px 0 30px; padding: 18px 22px; background: #f3f1fb; border: 1px solid #d6d1ee; border-left: 4px solid var(--accent); border-radius: 8px; font-size: 16px; line-height: 1.65; color: var(--ink); max-width: 92ch; }
.takeaway-box strong { color: var(--accent-dark); font-weight: 700; }
.takeaway-block .projection-chain { margin: 8px 0 18px; }
.takeaway-figure.medium a { max-width: 900px; }
.attribution-findings.compact { grid-template-columns: repeat(4, minmax(0, 1fr)); }
.attribution-findings.compact a { padding: 18px 18px; }
.attribution-findings.compact strong { font-size: 30px; }
.attribution-findings.compact p { font-size: 12.5px; }
.attribution-findings.compact em { font-size: 12.5px; }
.proof-block { margin: 20px 0 22px; padding: 20px 24px 8px; border: 1px solid var(--line); background: #fff; border-radius: 2px; max-width: 92ch; }
.proof-block .proof-title { margin: 0 0 12px; font: 500 16px/1.35 var(--serif); color: var(--ink); }
.proof-block .proof-title span { display: inline-block; margin-right: 10px; font: 500 11px var(--mono); letter-spacing: 0.08em; text-transform: uppercase; color: var(--accent); vertical-align: 2px; }
.proof-block p { font-size: 14px; line-height: 1.75; color: var(--ink); margin: 0 0 12px; }
.proof-block p b { font-weight: 600; font-style: italic; }
.proof-block .proof-eq { display: block; position: relative; text-align: center; margin: 14px 0 16px; padding: 0 40px; font-family: var(--serif); font-size: 18px; color: var(--accent-dark); }
.proof-block .proof-eq .eq-number { position: absolute; right: 0; top: 50%; transform: translateY(-50%); font-family: var(--font); font-size: 12px; color: var(--muted); }
.proof-block sub, .proof-block sup { font-size: 0.72em; line-height: 0; }
.takeaway-block .rope-equations { margin: 4px 0 16px; }
.attribution-heading { border-top: 2px solid var(--rule); padding-top: 18px; }
.attribution-findings { gap: 0; border-top: 1px solid var(--line); border-bottom: 1px solid var(--line); margin-bottom: 40px; }
.attribution-findings a { background: none; border: 0; border-left: 1px solid var(--line); padding: 20px 24px; transform: none !important; }
.attribution-findings a:first-child { border-left: 0; padding-left: 0; }
.attribution-findings a:hover { box-shadow: none; }
.attribution-findings strong { font: 500 34px/1.1 var(--serif); letter-spacing: 0; color: var(--ink); }
.attribution-findings strong span { font-size: 20px; color: var(--muted); }
.attribution-findings em { font-style: normal; color: var(--accent-dark); font-weight: 600; border-top: 0; padding-top: 4px; }
.attribution-copy h3 { padding-left: 0; }
.attribution-copy h3::before { display: none; }
.attribution-copy p strong { color: var(--ink); }
.attribution-figure a { border: 1px solid var(--line); background: none; }
.projection-chain { border: 1px solid var(--line); background: none; }
.projection-chain > div { background: none; }
.chain-symbol { color: var(--ink); font-family: var(--serif); }
.attribution-conclusion { background: none; color: var(--ink); border-top: 2px solid var(--rule); border-bottom: 1px solid var(--line); padding: 26px 0; }
.attribution-conclusion h3, .attribution-conclusion p, .attribution-conclusion .conclusion-mark { color: var(--ink); }
.attribution-conclusion strong { color: var(--ink); text-decoration: none; }
.attribution-conclusion .conclusion-mark { color: var(--accent); }
.author-lead { border-bottom-width: 1.5px; }
.ours-value { background: none; color: var(--accent-dark); text-decoration: underline; text-decoration-color: var(--accent); text-underline-offset: 3px; }
.comparison-ours { color: var(--accent-dark); }
.result-highlights { border-top: 1px solid var(--line); border-bottom: 1px solid var(--line); }
.result-highlights strong { font: 500 28px/1.1 var(--serif); letter-spacing: 0; }
.result-highlights span { font-family: var(--mono); font-size: 11px; letter-spacing: 0.06em; text-transform: uppercase; color: var(--muted); }
.ready-results { border-top: 1px solid var(--line); }
.full-paper-results { border-top: 1px solid var(--line); margin-top: 48px; }
.ablation-evidence { align-items: start; padding: 32px 0; }
.pipeline { align-items: start; margin-top: 40px; }
.full-results-intro { align-items: baseline; margin-bottom: 4px; }
.full-results-intro h3 { font-size: 22px; }
.paper-result-block { margin: 0; padding: 0; border-bottom: 1px solid var(--line); }
.paper-result-block > summary { cursor: pointer; padding: 16px 0; font: 500 18px/1.3 var(--serif); color: var(--ink); display: flex; align-items: baseline; gap: 14px; }
.paper-result-block > summary::marker { content: ""; }
.paper-result-block > summary::-webkit-details-marker { display: none; }
.paper-result-block > summary::after { content: "+"; margin-left: auto; font: 500 16px var(--mono); color: var(--accent); }
.paper-result-block[open] > summary::after { content: "−"; }
.paper-result-block > summary .eyebrow { margin: 0; }
.paper-result-block > summary:hover { color: var(--accent-dark); }
.paper-result-block[open] { padding-bottom: 24px; }
.paper-result-block[open] > summary { border-bottom: 1px solid var(--line); margin-bottom: 14px; }
.paper-result-block .paper-table-heading { justify-content: flex-end; margin: 0 0 10px; }
.code-card, .citation-card { background: none; border: 1px solid var(--line); }
.code-top { background: var(--soft); border-bottom: 1px solid var(--line); font-family: var(--mono); font-size: 11px; letter-spacing: 0.06em; text-transform: uppercase; }
.citation-section { display: block; }
.code-cite-grid { display: grid; grid-template-columns: 1fr 1fr; gap: 28px; margin-top: 8px; }
.code-card pre, .citation-card pre { font-family: var(--mono); font-size: 12px; color: var(--ink); }
.citation-card pre { white-space: pre-wrap; word-break: break-word; }
.code-cite-grid .notebook-links a { font-size: 13px; }
.precision-tag { background: none; border: 1px solid var(--line); color: var(--ink); }
.image-badge { border-radius: 2px; font-family: var(--mono); font-size: 11px; font-weight: 500; }
.live-gallery { border: 0; border-top: 1px solid var(--line); padding-top: 24px; }
.dense-section { border-top: 1px solid var(--line); padding-top: 24px; }
.dense-cell { background: #fff; }
.dense-ours figcaption, .gallery-ours figcaption { background: var(--accent); color: #fff; }
.dense-ours, .gallery-ours { border-color: var(--accent); }
.gallery-cell { background: #fff; }
.inspection-grid { border-top: 1px solid var(--line); }
.paper-examples > summary, .protocol-details summary, .algorithm-details summary { font-family: var(--serif); font-size: 17px; }

/* ---------- video pair cards: light, hairline ---------- */
.feature-card { background: #fff; color: var(--ink); border: 1px solid var(--line); }
.feature-top { padding: 12px 14px; border-bottom: 1px solid var(--line); }
.feature-top h3 { font-family: var(--font); font-size: 13px; font-weight: 500; color: var(--ink); }
.paradigm-tag { font-family: var(--mono); font-size: 10px; letter-spacing: 0.06em; text-transform: uppercase; border: 1px solid var(--line); color: var(--muted); }
.paradigm-tag.frame, .paradigm-tag.long { color: var(--muted); border-color: var(--line); }
.feature-index { font-family: var(--mono); color: var(--muted); }
.feature-pair { background: var(--line); }
.feature-video { background: #0e0f12; }
.feature-video figcaption { font-family: var(--mono); font-size: 10px; letter-spacing: 0.02em; background: rgba(14, 15, 18, 0.78); }
.feature-ours figcaption { background: rgba(75, 67, 168, 0.9); }
.feature-controls { padding: 10px 14px 0; }
.feature-play { color: var(--ink); border: 1px solid var(--ink); font-family: var(--mono); font-size: 11px; }
.feature-play:hover { background: var(--ink); color: #fff; }
.feature-select select { color: var(--ink); background: #fff; }
.feature-time { font-family: var(--mono); color: var(--muted); }
.feature-seek { accent-color: var(--accent); margin: 8px 14px 0; width: calc(100% - 28px); }
.feature-prompt { color: var(--muted); padding: 8px 14px 14px; font-size: 12px; }
.feature-card button:focus-visible, .feature-card select:focus-visible, .feature-card input:focus-visible { outline-color: var(--accent); }
.more-video-grid { grid-template-columns: repeat(2, minmax(0, 1fr)); gap: 20px; }
@media (min-width: 1200px) {
  .more-video-grid { width: min(1360px, calc(100vw - 64px)); margin-left: calc((100% - min(1360px, 100vw - 64px)) / 2); }
}
.feature-title { margin: 0; padding: 8px 12px; font: 500 13px/1.3 var(--font); color: var(--ink); border-bottom: 1px solid var(--line); white-space: nowrap; overflow: hidden; text-overflow: ellipsis; }
.feature-video figcaption { top: 6px; left: 6px; padding: 3px 6px; white-space: nowrap; line-height: 1.35; }
.feature-video figcaption b { font-weight: 500; }
.showcase-heading h2 .nowrap { white-space: nowrap; }
.showcase-group + .showcase-group { margin-top: 40px; }

/* ---------- footer / misc ---------- */
.footer { border-top: 2px solid var(--rule); padding-block: 26px; }
.footer p { font-family: var(--mono); font-size: 11px; letter-spacing: 0.04em; }
.skip { background: var(--ink); }
.table-directory, .paper-table-tabs { font-family: var(--mono); font-size: 11px; letter-spacing: 0.02em; }

@media (max-width: 900px) {
  .hero-lede { grid-template-columns: 1fr; gap: 32px; }
  .hero h1 { max-width: none; }
  .code-cite-grid { grid-template-columns: 1fr; }
}
@media (max-width: 1000px) {
  .attribution-findings.compact { grid-template-columns: repeat(2, minmax(0, 1fr)); }
  .attribution-findings.compact a { border-left: 0; padding-left: 0; border-top: 1px solid var(--line); }
  .attribution-findings.compact a:first-child { border-top: 0; }
}
@media (max-width: 760px) {
  .attribution-findings.compact { grid-template-columns: 1fr; }
  .wrap { width: min(1120px, calc(100% - 32px)); }
  .more-video-grid { grid-template-columns: 1fr; }
  .nav-links a { white-space: nowrap; }
  .nav-links a[href="#examples"] { display: none !important; }
  .hero-facts { grid-template-columns: 1fr 1fr; gap: 14px 18px; }
  .attribution-findings { grid-template-columns: 1fr; }
  .attribution-findings a { border-left: 0; border-top: 1px solid var(--line); padding: 18px 0; }
  .attribution-findings a:first-child { border-top: 0; }
  .section { padding-top: 48px; padding-bottom: 48px; }
}
@media (prefers-reduced-motion: reduce) {
  .attribution-findings a { transition: none; }
}