/* CALiT project page. One file, no framework, system fonts, no external request. */
:root{
  --fg:#1b1d1f; --muted:#5d636a; --faint:#8a9097; --line:#e3e5e8; --soft:#f5f6f7;
  --accent:#1b7837; --calit:#1b7837; --cat:#1f77b4; --vit:#555555; --dark:#1f2328;
  --camix:#2c4a66; --cA:#4e79a7; --cB:#f28e2b; --cC:#59a14f; --cD:#b07aa1;
  --text:760px; --wide:1040px;
  color-scheme:light;
}
*{box-sizing:border-box}
html{-webkit-text-size-adjust:100%;scroll-behavior:smooth}
body{margin:0;background:#fff;color:var(--fg);
  font:16px/1.6 system-ui,-apple-system,"Segoe UI",Roboto,"Helvetica Neue",Arial,sans-serif}
a{color:var(--accent);text-decoration:none}
a:hover{text-decoration:underline}
img,video{display:block;max-width:100%;height:auto}
.wrap{max-width:var(--wide);margin:0 auto;padding:0 24px}
.text{max-width:var(--text);margin-inline:auto}
sub,sup{line-height:0}

/* header */
.hero{text-align:center;padding:64px 0 0}
.wordmark{margin:0 0 12px;font-size:13px;font-weight:650;letter-spacing:.14em;text-transform:uppercase;color:var(--accent)}
.wordmark b{font-weight:800;letter-spacing:.04em;text-transform:none;font-size:15px}
h1{font-size:clamp(28px,4.4vw,44px);line-height:1.15;margin:0;font-weight:700;letter-spacing:-.012em;text-wrap:balance}
.authors{margin:20px 0 0;font-size:18px;display:flex;flex-wrap:wrap;justify-content:center;gap:4px 22px}
.authors a,.authors span{color:var(--fg)}
.authors sup{color:var(--muted);font-size:11px;margin-left:1px}
.affils{margin:6px 0 0;color:var(--muted);font-size:15px;display:flex;flex-wrap:wrap;justify-content:center;gap:2px 22px}
.affils sup{font-size:10px;margin-right:2px}
.logos{display:flex;justify-content:center;align-items:center;gap:28px;margin:18px 0 0}
.logos img{height:60px;width:auto}
.buttons{display:flex;flex-wrap:wrap;justify-content:center;gap:10px;margin:24px 0 0}
.btn{display:inline-flex;align-items:center;gap:8px;padding:8px 17px;border-radius:999px;
  background:var(--dark);color:#fff;font-size:15px;font-weight:500;line-height:1.4}
.btn:hover{background:#000;text-decoration:none}
.btn svg{width:17px;height:17px;fill:currentColor;flex:none}
.btn[aria-disabled=true]{background:var(--soft);color:var(--faint);box-shadow:inset 0 0 0 1px var(--line);cursor:default}
.btn .soon{font-size:12px}

/* sections */
section{padding:56px 0 0}
h2{font-size:26px;line-height:1.25;margin:0 0 18px;text-align:center;font-weight:700;letter-spacing:-.005em}
h3{font-size:18px;line-height:1.3;margin:40px 0 14px;text-align:center;font-weight:600}
p{margin:0 0 14px}
.lead{font-size:18px;line-height:1.55;text-align:center;margin:22px auto 0;max-width:var(--text);text-wrap:pretty}
.abstract p{text-wrap:pretty}
.prose{max-width:var(--text);margin:0 auto 24px;text-wrap:pretty}
figure{margin:0}
.fig img{width:100%}
.caption,figcaption.caption{font-size:14.5px;line-height:1.55;color:var(--muted);margin:12px auto 0;max-width:var(--text)}
.caption b{color:var(--fg);font-weight:600}
.method-list{margin:26px auto 0;max-width:var(--text);padding:0;list-style:none;display:grid;gap:14px}
.method-list li{padding-left:16px;border-left:3px solid var(--calit)}
.method-list li.cag{border-left-color:var(--camix)}
.method-list li.lmix{border-left-color:var(--cC)}
.method-list li.cost{border-left-color:var(--line)}
.method-list b{font-weight:650}
.note{font-size:14px;color:var(--faint);text-align:center;margin:-8px auto 22px;max-width:var(--text)}


/* stat strip */
.stats{display:grid;grid-template-columns:repeat(3,minmax(0,1fr));gap:20px;margin:36px auto 0;text-align:left}
.stat{padding:18px 20px 16px;border-radius:10px;background:var(--soft);border:1px solid var(--line)}
.stat .num{display:block;font-size:40px;line-height:1;font-weight:800;letter-spacing:-.03em;
  font-variant-numeric:tabular-nums;color:var(--fg)}
.stat .num small{font-size:22px;font-weight:700;letter-spacing:0;margin-left:2px}
.stat p{margin:10px 0 0;font-size:14.5px;line-height:1.45;color:#33373b}
.stats.good .num{color:var(--calit)}
.teaser{margin:48px auto 0}

/* method diagram */
.diagram{display:flex;align-items:stretch;gap:26px;margin:8px auto 0}
.diagram .sep{width:1px;background:var(--line);flex:none}
.diagram svg{display:block;width:100%;height:auto}
.diagram .blocks{flex:600}
.diagram .zoom{flex:400}
.dg text{font:13px system-ui,-apple-system,"Segoe UI",Roboto,Arial,sans-serif;fill:#1b1d1f}
.dg .ttl{font-weight:650;font-size:14.5px}
.dg .sm{font-size:12px;fill:var(--muted)}
.dg .it{font-style:italic}
.dg .b{font-weight:650}
.dg .bx{fill:#fff;stroke:#8f959c;stroke-width:1}
.dg .ffn{fill:var(--soft);stroke:#c4c8cd;stroke-width:1}
.dg .hi{fill:#e7eef5;stroke:var(--camix);stroke-width:1.6}
.dg .cag{fill:#eef3f8;stroke:var(--camix);stroke-width:1.4}
.dg .lmx{fill:#eef6ec;stroke:#33602c;stroke-width:1.4}
.dg .ar{stroke:#5d636a;stroke-width:1.2;fill:none}
.dg .dot{fill:none;stroke:var(--camix);stroke-width:1.4;stroke-dasharray:2 3}
.dg .tok{stroke:var(--camix);stroke-width:1.4;fill:none}
.dg .lab{fill:var(--camix)}
.eq{max-width:var(--text);margin:26px auto 0;padding:16px 18px;border:1px solid var(--line);border-radius:8px;
  background:var(--soft);text-align:center;font:17px/1.7 "Cambria Math","STIX Two Math","Latin Modern Math",Cambria,Georgia,serif}
.eq .row{white-space:nowrap;overflow-x:auto}
.eq .part{display:inline-block;margin:0 14px}
.eq var{font-style:italic}
.eq .bf{font-weight:700;font-style:normal}
.eq .frac{display:inline-flex;flex-direction:column;vertical-align:middle;text-align:center;margin:0 2px;font-size:15px;line-height:1.25}
.eq .frac>span:first-child{border-bottom:1px solid currentColor;padding:0 3px}
.eq .ss{display:inline-flex;flex-direction:column;vertical-align:middle;font-size:.75em;line-height:1.05;margin-left:1px}
.eq .ss sub,.eq .ss sup{font-size:1em;line-height:1.05;vertical-align:baseline}
.eq .paren{display:inline-block;font-size:2em;font-weight:300;line-height:1;vertical-align:middle;transform:scaleX(.8)}
.eq .where{display:block;margin-top:6px;font:14px/1.5 system-ui,-apple-system,"Segoe UI",Roboto,Arial,sans-serif;color:var(--muted);white-space:normal}

/* tabs (JS adds the bar; without JS every pane is shown) */
.tabbar{display:flex;justify-content:center;flex-wrap:wrap;gap:8px;margin:0 0 16px}
.tabbar button{font:inherit;font-size:14.5px;padding:6px 14px;border-radius:999px;border:1px solid var(--line);
  background:#fff;color:var(--fg);cursor:pointer}
.tabbar button:hover{border-color:#c4c8cd}
.tabbar button[aria-selected=true]{background:var(--dark);border-color:var(--dark);color:#fff}
.stack{display:grid;grid-template-columns:minmax(0,1fr);gap:32px;margin:0 auto}
.stack>figure{min-width:0}
.stack figcaption{font-size:14.5px;color:#33373b;text-align:center;margin-top:7px}

/* PCA explorer */
.explorer{max-width:var(--wide);margin:0 auto}
.thumbs{display:flex;justify-content:center;flex-wrap:wrap;gap:10px;margin:0 0 18px}
.thumbs button{padding:0;border:0;border-radius:6px;background:none;cursor:pointer;overflow:hidden;
  box-shadow:0 0 0 1px var(--line);opacity:.62;transition:opacity .15s,box-shadow .15s}
.thumbs button:hover{opacity:.9}
.thumbs button[aria-pressed=true]{opacity:1;box-shadow:0 0 0 2.5px var(--calit)}
.thumbs img{width:72px;height:72px;display:block}
.triple{display:grid;grid-template-columns:repeat(3,minmax(0,1fr));gap:14px}
.triple figure{min-width:0}
.triple img{width:100%;aspect-ratio:1;border-radius:6px;background:var(--soft)}
.triple figcaption{font-size:14.5px;color:#33373b;text-align:center;margin-top:7px}
.triple figcaption.ours{color:var(--calit);font-weight:600}

/* table */
.tablewrap{overflow-x:auto;max-width:var(--text);margin:0 auto}
.tablewrap.wide{max-width:880px}
table{border-collapse:collapse;width:100%;min-width:560px;font-size:14.5px;font-variant-numeric:tabular-nums}
thead tr:first-child th{border-top:2px solid var(--fg)}
th,td{padding:5px 8px;text-align:center;white-space:nowrap}
th:first-child,td:first-child{text-align:left}
thead th{font-weight:600}
thead tr:last-child th{border-bottom:1px solid var(--fg);font-weight:500;color:var(--muted)}
thead .grp{border-bottom:1px solid var(--line)}
thead th[rowspan]{border-bottom:1px solid var(--fg);vertical-align:bottom}
tbody.g+tbody.g tr:first-child td{border-top:1px solid var(--line)}
tbody.g+tbody.g.heavy tr:first-child td{border-top:1.5px solid var(--fg)}
tbody:last-child tr:last-child td{border-bottom:2px solid var(--fg)}
tr.sec td{text-align:left;font-weight:600;padding-top:9px;color:var(--fg)}
tr.sec td i{font-weight:400;color:var(--muted)}
tr.ours td{font-weight:500}
tr.ours td:first-child{color:var(--calit)}
tr.delta td{color:var(--calit);font-style:italic;font-size:13.5px;padding-top:1px}
tr.delta td.neg{color:var(--faint)}
td.na{color:var(--faint)}
td b{font-weight:700}
td .src{color:var(--faint);font-size:12px;margin-left:3px}
td .u{color:var(--faint);font-size:12.5px}
td.ab{padding-left:22px}

/* collapsible */
details{max-width:var(--text);margin:26px auto 0;border:1px solid var(--line);border-radius:8px}
summary{cursor:pointer;list-style:none;padding:11px 16px;font-weight:600;font-size:15.5px}
summary::-webkit-details-marker{display:none}
summary::after{content:"";display:inline-block;width:7px;height:7px;margin:0 0 3px 10px;border-right:2px solid currentColor;
  border-bottom:2px solid currentColor;transform:rotate(45deg);transition:transform .15s}
details[open] summary::after{transform:rotate(225deg);margin-bottom:0}
summary .count{color:var(--faint);font-weight:500}
details pre{margin:0;padding:14px 16px;border-top:1px solid var(--line);background:var(--soft);border-radius:0 0 8px 8px;
  font:13px/1.6 ui-monospace,SFMono-Regular,Menlo,Consolas,monospace;overflow-x:auto;white-space:pre}
details pre .c{color:var(--faint)}

/* bibtex */
.bib{position:relative;max-width:var(--text);margin:0 auto}
.bib pre{margin:0;padding:16px 18px;background:var(--soft);border:1px solid var(--line);border-radius:8px;
  font:13.5px/1.55 ui-monospace,SFMono-Regular,Menlo,Consolas,monospace;overflow-x:auto;white-space:pre}
.bib button{position:absolute;top:10px;right:10px;font:inherit;font-size:13px;padding:4px 11px;border-radius:6px;
  border:1px solid var(--line);background:#fff;color:var(--fg);cursor:pointer}

footer{margin:72px 0 0;padding:22px 0 40px;border-top:1px solid var(--line);text-align:center;font-size:13.5px;color:var(--faint)}

@media (max-width:820px){
  .diagram{flex-direction:column;gap:22px}
  .diagram .sep{display:none}
  .diagram .blocks,.diagram .zoom{overflow-x:auto}
  .diagram .blocks svg{min-width:500px}
  .diagram .zoom svg{max-width:440px;margin:0 auto}
}
@media (max-width:720px){
  .wrap{padding:0 16px}
  .hero{padding-top:40px}
  .authors{font-size:16.5px}
  .logos img{height:48px}
  section{padding-top:44px}
  h2{font-size:22px}
  .lead{font-size:16.5px}
  .stats{grid-template-columns:minmax(0,1fr);gap:12px}
  .stat{display:grid;grid-template-columns:96px minmax(0,1fr);gap:14px;align-items:center;padding:14px 16px}
  .stat .num{font-size:32px}
  .stat p{margin:0}
  .triple{gap:8px}
  .triple figcaption{font-size:12.5px}
  .thumbs{gap:8px}
  .thumbs img{width:52px;height:52px}
  .eq{font-size:15.5px}
  .eq .part{display:block;margin:2px 0}
  .pan{overflow-x:auto;margin-inline:-16px;padding:0 16px 4px;scrollbar-width:thin}
  .pan img{min-width:720px}
}