:root{
  --ink:#16202E;
  --body-ink:#2A3442;
  --paper:#FFFFFF;
  --wash:#F3F6F5;
  --accent:#1F6F63;
  --accent-soft:#E7F0EE;
  --bronze:#A9722F;
  --rule:#E1E6E4;
  --muted:#66717C;
  --display:"Spectral",Georgia,serif;
  --sans:"IBM Plex Sans",system-ui,sans-serif;
  --mono:"IBM Plex Mono",ui-monospace,Menlo,monospace;
  --bar-h:64px;
}

*{box-sizing:border-box}
html{-webkit-text-size-adjust:100%;scroll-behavior:smooth}
body{
  margin:0;background:var(--paper);color:var(--body-ink);
  font-family:var(--sans);font-size:16px;line-height:1.62;
}
.hidden{display:none!important}
.skip{position:absolute;left:-9999px}
.skip:focus{left:12px;top:10px;z-index:60;background:var(--accent);color:#fff;padding:8px 14px}
a{color:var(--accent)}
:focus-visible{outline:2px solid var(--accent);outline-offset:2px}
/* Focus moves to <main> on every route change so screen readers land on the
   new content. It is a container, not a control, so it takes no focus ring. */
main:focus,main:focus-visible{outline:none}

/* ---------- top bar ---------- */
.bar{
  position:sticky;top:0;z-index:40;min-height:var(--bar-h);
  display:flex;align-items:center;gap:22px;padding:0 26px;
  background:rgba(255,255,255,.96);backdrop-filter:blur(8px);
  border-bottom:1px solid var(--rule)
}
.brand{display:flex;align-items:baseline;gap:11px;text-decoration:none;color:var(--ink);flex:none}
.brand .mark{font-family:var(--display);font-weight:600;font-size:1.2rem;white-space:nowrap}
.brand .full{font-size:.68rem;line-height:1.25;color:var(--muted)}
@media (max-width:1340px){.brand .full{display:none}}

/* ---------- horizontal navigation ---------- */
.topnav{display:flex;align-items:stretch;gap:1px;flex:1;min-width:0}
.topnav .sec{position:relative;display:flex;align-items:stretch}
.topnav a.top{
  display:flex;align-items:center;gap:5px;padding:0 10px;height:var(--bar-h);
  text-decoration:none;color:var(--body-ink);font-size:.86rem;white-space:nowrap;
  border-bottom:2px solid transparent
}
.topnav a.top:hover{color:var(--ink);background:var(--wash)}
.topnav a.top.on,.topnav a.top.ancestor{color:var(--accent);border-bottom-color:var(--accent);font-weight:500}
.topnav .caret{display:flex;color:var(--muted);transition:transform .15s ease}
.topnav .sec.open .caret{transform:rotate(180deg)}
@media (prefers-reduced-motion:reduce){.topnav .caret{transition:none}}

.topnav .panel{
  position:absolute;top:var(--bar-h);left:0;z-index:45;
  background:#fff;border:1px solid var(--rule);border-radius:0 0 9px 9px;
  border-top:2px solid var(--accent);
  box-shadow:0 16px 40px rgba(22,32,46,.13);padding:18px 20px;
  max-width:min(880px,92vw)
}
.topnav .sec:nth-last-child(-n+3) .panel{left:auto;right:0}
.topnav .sec.more{margin-left:4px}
.topnav .sec.more>a.top{color:var(--muted)}
.topnav .sec.more .panel{left:auto;right:0;min-width:250px}
.topnav .panel .cols{
  display:grid;grid-template-columns:repeat(auto-fit,minmax(190px,1fr));
  gap:6px 26px;max-height:70vh;overflow-y:auto
}
.topnav .panel .col{min-width:0;break-inside:avoid;margin-bottom:10px}
.topnav .panel a{display:block;text-decoration:none;border-radius:5px;line-height:1.35}
.topnav .panel a.h{
  color:var(--ink);font-weight:600;font-size:.87rem;padding:5px 7px;margin-bottom:1px
}
.topnav .panel a.sub{color:var(--muted);font-size:.82rem;padding:4px 7px 4px 18px}
.topnav .panel a:hover{background:var(--wash);color:var(--accent)}
.topnav .panel a.on{color:var(--accent);background:var(--accent-soft)}

.iconbtn{
  display:none;flex-direction:column;justify-content:center;gap:4px;
  width:36px;height:36px;background:none;border:0;cursor:pointer;padding:0;flex:none
}
.iconbtn span{display:block;height:2px;background:var(--ink);border-radius:2px}

.searchwrap{position:relative;width:min(230px,26vw);flex:none}
#q{
  width:100%;font:inherit;font-size:.86rem;padding:7px 30px 7px 11px;
  border:1px solid var(--rule);border-radius:6px;background:var(--wash);color:var(--ink)
}
#q:focus{background:#fff;border-color:var(--accent)}
.searchwrap kbd{
  position:absolute;right:8px;top:50%;transform:translateY(-50%);
  font-family:var(--mono);font-size:.68rem;color:var(--muted);
  border:1px solid var(--rule);border-radius:4px;padding:1px 5px;background:#fff;pointer-events:none
}
#q:focus + kbd{display:none}

.results{
  position:absolute;top:calc(100% + 7px);right:0;width:min(520px,88vw);max-height:64vh;
  overflow-y:auto;background:#fff;border:1px solid var(--rule);border-radius:8px;
  box-shadow:0 14px 40px rgba(22,32,46,.14);padding:6px;z-index:50
}
.results .hit{display:block;padding:9px 11px;border-radius:6px;text-decoration:none;color:inherit}
.results .hit:hover,.results .hit.on{background:var(--accent-soft)}
.results .ht{font-weight:600;color:var(--ink);font-size:.9rem}
.results .hs{font-size:.79rem;color:var(--muted);display:-webkit-box;-webkit-line-clamp:2;-webkit-box-orient:vertical;overflow:hidden}
.results mark{background:#FBEBC8;color:inherit;padding:0 1px}
.results .none{padding:16px;color:var(--muted);font-size:.87rem}

/* ---------- mobile drawer ---------- */
.drawer{
  position:fixed;top:var(--bar-h);left:0;right:0;bottom:0;z-index:38;
  background:#fff;overflow-y:auto;padding:14px 20px 60px;
  border-top:1px solid var(--rule)
}
.drawer ul{list-style:none;margin:0;padding:0}
.drawer a{display:block;padding:9px 6px;text-decoration:none;color:var(--body-ink);
  border-bottom:1px solid var(--rule)}
.drawer .lv1>li>a{font-family:var(--display);font-weight:600;font-size:1.02rem;color:var(--ink)}
.drawer .lv2 a{padding-left:18px;font-size:.9rem}
.drawer .lv3 a{padding-left:34px;font-size:.85rem;color:var(--muted)}
.drawer a.on{color:var(--accent);font-weight:600}

/* ---------- layout ---------- */
.shell{
  display:grid;grid-template-columns:minmax(0,1100px) 210px;
  justify-content:center;gap:44px;max-width:1420px;margin:0 auto;
  padding:0 26px;align-items:start
}

/* ---------- content ---------- */
main{min-width:0;padding:30px 0 70px}
.crumbs{font-size:.78rem;color:var(--muted);margin-bottom:14px}
.crumbs a{color:var(--muted);text-decoration:none}
.crumbs a:hover{color:var(--accent)}
.crumbs span{margin:0 6px;color:var(--rule)}

.page{max-width:100%}

/* Page banner. In the export this is a CSS background on a hidden div, so a
   text-only extraction loses it. It is shown as its own image rather than as
   a backdrop for the title: several banners already contain the institute
   name, and overlaid text on an unknown image is never reliably legible. */
.page img.banner{
  display:block;width:100%;height:auto;max-width:100%;max-height:none;
  border-radius:10px;margin:0 0 26px;background:var(--wash)
}
@media (max-width:600px){.banner{max-height:190px;margin-bottom:18px}}

/* journal feature: cover beside text */
.feature{
  display:grid;grid-template-columns:minmax(0,210px) minmax(0,1fr);gap:28px;
  align-items:start;margin:38px 0 10px;padding:24px;
  background:var(--wash);border:1px solid var(--rule);border-radius:12px
}
.feature .fig img{
  width:100%;max-width:none;max-height:none;height:auto;
  border-radius:8px;margin:0;box-shadow:0 6px 20px rgba(22,32,46,.16)
}
.feature .body{min-width:0}
.feature .eyebrow{
  font-family:var(--mono);font-size:.68rem;letter-spacing:.09em;text-transform:uppercase;
  color:var(--bronze);margin:0 0 8px
}
.feature h2{
  font-family:var(--display);font-size:1.32rem;font-weight:600;color:var(--ink);
  margin:0 0 10px;border:0;padding:0;line-height:1.22
}
.feature p{margin:0 0 12px;font-size:.94rem}
.feature .links{display:flex;gap:8px 16px;flex-wrap:wrap;align-items:center;margin:0}
.feature .links a.quiet{color:var(--accent);font-size:.9rem;text-decoration:none;border-bottom:1px solid var(--rule)}
.feature .links a.quiet:hover{border-bottom-color:var(--accent)}
@media (max-width:640px){
  .feature{grid-template-columns:1fr;gap:18px;padding:18px}
  .feature .fig{max-width:180px}
}

/* per-paper purchase page */
.buyid{font-family:var(--mono);font-size:.78rem;color:var(--accent);letter-spacing:.04em;margin:0 0 6px}
.buymeta{color:var(--muted);font-size:.88rem;margin:-12px 0 22px}
.buybox{border:1px solid var(--rule);border-radius:10px;background:var(--wash);padding:20px 22px;margin:0 0 20px}
.buybox .price{font-family:var(--display);font-size:1.5rem;font-weight:600;color:var(--ink);margin-bottom:8px}
.buynote{font-size:.87rem;color:var(--body-ink);margin:0 0 16px;max-width:56ch}
.buyacts{display:flex;align-items:center;gap:16px;flex-wrap:wrap;margin:0}
.buyacts .dl{font-size:.88rem;color:var(--accent);text-decoration:none;border-bottom:1px solid var(--rule)}
.buyacts .dl:hover{border-bottom-color:var(--accent)}
.buyacts .dl::after{content:none}
.buybox.freebox{background:var(--accent-soft);border-color:var(--accent-soft)}
.buybox.unavailable{background:#fff;border-style:dashed}
.buybox.unavailable .buynote{margin:0;color:var(--muted)}
.buyalt{font-size:.86rem;color:var(--muted)}
.buyback{margin-top:26px;font-size:.88rem}
.pmeta .soon{font-size:.76rem;color:var(--rule);font-style:italic;letter-spacing:0}

.katex{font-size:1.02em}
.katex-display{margin:14px 0;overflow-x:auto;overflow-y:hidden}

/* Page grid.
   Google Sites lays a page out in twelfths; --w carries a column's width so a
   row that was three columns in the export is three columns here. Columns
   stack on a narrow screen. */
.row{
  display:grid;
  grid-template-columns:repeat(12,minmax(0,1fr));
  gap:0 26px;
  align-items:start;
  margin:0 0 8px;
}
.col{grid-column:span var(--w, 12);min-width:0}
.col>:first-child{margin-top:0}
.col>:last-child{margin-bottom:0}

@media (max-width:820px){
  .row{display:block}
  .col{margin:0 0 18px}
}

/* a rail block built around a cover image */
.rblock.cover .item{display:block;text-decoration:none}
.rblock.cover img{
  display:block;width:100%;max-width:150px;height:auto;border-radius:6px;
  margin:0 0 9px;box-shadow:0 1px 6px rgba(22,32,46,.18)
}
.rblock.cover .what{display:block;font-weight:600;line-height:1.3;margin-bottom:4px}
.rblock.cover .note{display:block;color:var(--muted);font-size:.76rem;line-height:1.45}
.rblock.cover .item:hover img{box-shadow:0 2px 10px rgba(22,32,46,.28)}

/* the per-page contents list, sitting under the site-wide rail */
.railtoc{margin-top:22px;padding-top:16px;border-top:1px solid var(--rule)}
.railtoc h4{color:var(--muted)}
.rail .railtoc a{
  display:block;padding:4px 0 4px 11px;border-left:2px solid var(--rule);
  color:var(--muted);font-size:.79rem;line-height:1.35;text-decoration:none
}
.rail .railtoc a.on{border-left-color:var(--accent);color:var(--accent)}
.rail .railtoc a:hover{color:var(--accent)}

/* section index cards */
.pcards{display:grid;grid-template-columns:repeat(auto-fit,minmax(230px,1fr));gap:14px;margin:0 0 30px}
.pcard{
  display:block;padding:14px 16px;border:1px solid var(--rule);border-radius:9px;
  text-decoration:none;background:var(--card,#fff)
}
.pcard:hover{border-color:var(--accent);background:var(--wash)}
.pcard::after{content:none}
.pname{display:block;font-family:var(--display);font-size:1.05rem;font-weight:600;color:var(--ink)}
.pblurb{display:block;font-size:.82rem;color:var(--muted);line-height:1.4;margin-top:5px}

/* preprints list */
.page .lede{color:var(--muted);font-size:.9rem;margin-bottom:22px}
.papers{margin:0 0 26px}
.paper{
  display:grid;grid-template-columns:5.4rem minmax(0,1fr);gap:14px;
  align-items:baseline;padding:7px 0;border-bottom:1px solid var(--rule)
}
.paper:last-child{border-bottom:0}
.pid{
  font-family:var(--mono);font-size:.83rem;font-weight:500;
  color:var(--accent);text-decoration:none;white-space:nowrap
}
a.pid:hover{text-decoration:underline}
a.pid::after{content:none}
.pid.pending{color:var(--muted)}
.pid.pending::after{content:" \2014";color:var(--rule)}
.ptitle{font-size:.94rem;line-height:1.4;color:var(--ink)}
.pmeta{display:inline;white-space:nowrap;margin-left:8px}
.pmeta .venue{font-size:.79rem;color:var(--muted);font-style:italic}
.pid.free{color:var(--ink)}
.pid.free::after{content:none}
.pmeta .sale{
  font-size:.7rem;font-family:var(--mono);letter-spacing:.04em;color:var(--accent);
  border:1px solid var(--accent);border-radius:3px;padding:0 5px
}
.pmeta .pub{
  font-size:.68rem;letter-spacing:.05em;text-transform:uppercase;color:var(--bronze);
  border:1px solid var(--bronze);border-radius:3px;padding:0 5px
}
@media (max-width:600px){
  .paper{grid-template-columns:1fr;gap:2px}
  .pmeta{white-space:normal}
}

/* image grids, regrouped from the export's flat sequence */
/* a named portrait: smaller than a content image, with its role underneath */
.portrait{
  float:right;              /* sits beside the opening text, hard against the
                               right edge, with the prose wrapping around it */
  max-width:200px;margin:4px 0 18px 30px;
}
.page .portrait img{
  width:100%;max-width:200px;max-height:none;margin:0;
  border-radius:8px;display:block
}
.portrait figcaption{margin-top:9px;line-height:1.35}
.portrait figcaption strong{display:block;font-size:.92rem;color:var(--ink)}
.portrait figcaption span{
  display:block;font-size:.78rem;color:var(--muted);
  font-family:var(--mono);letter-spacing:.02em
}
@media (max-width:820px){.portrait{max-width:140px;margin-left:20px}}
@media (max-width:480px){.portrait{float:none;margin:0 auto 18px;max-width:180px}}

.gallery{
  display:grid;grid-template-columns:repeat(auto-fill,minmax(165px,1fr));
  gap:22px 20px;margin:20px 0 26px
}
.gallery figure{margin:0;display:flex;flex-direction:column}
.page .gallery figure img{
  width:100%;max-width:none;max-height:300px;height:auto;object-fit:contain;
  object-position:top left;border-radius:8px;margin:0 0 7px;display:block
}
.gallery figcaption{font-size:.85rem;color:var(--body-ink);line-height:1.35}

/* call-to-action buttons from the export */
.page > .banner + h1{margin-top:0}
.page a.btn{
  display:inline-block;margin:0 7px 8px 0;padding:7px 14px;
  background:var(--accent);color:#fff;border-radius:6px;
  text-decoration:none;font-size:.85rem;font-weight:500;line-height:1.35
}
.page a.btn:hover{background:#175A50}
.page a.btn::after{content:none}
.page h1{
  font-family:var(--display);font-weight:600;font-size:clamp(1.7rem,3.4vw,2.35rem);
  line-height:1.16;color:var(--ink);margin:0 0 22px;letter-spacing:-.01em
}
.page h2{
  font-family:var(--display);font-weight:600;font-size:1.4rem;color:var(--ink);
  margin:38px 0 12px;padding-bottom:7px;border-bottom:1px solid var(--rule)
}
.page h3{font-family:var(--sans);font-weight:600;font-size:1.06rem;color:var(--ink);margin:28px 0 8px}
.page p{margin:0 0 14px}
.page ul,.page ol{margin:0 0 16px;padding-left:22px}
.page li{margin-bottom:5px}
.page li>p{margin:0 0 4px}
/* Content images are capped: the export includes portrait covers at
   1024x1536, which at full column width render over 1100px tall and push
   everything else off the page. */
.page img{
  max-width:100%;width:auto;height:auto;max-height:420px;
  border-radius:6px;margin:16px 0;display:block
}
.page iframe{width:100%;min-height:460px;border:1px solid var(--rule);border-radius:8px;margin:16px 0}
.page a[target="_blank"]::after{content:"\2197";font-size:.75em;vertical-align:super;margin-left:1px;color:var(--muted)}
/* when the label already is the URL the marker is noise */
.page a.url::after,.page a.imglink::after{content:none}
.page a.imglink{display:inline-block;line-height:0}
.page a.url{word-break:break-all}
.page table{width:100%;border-collapse:collapse;margin:16px 0;font-size:.9rem}
.page th,.page td{border:1px solid var(--rule);padding:7px 10px;text-align:left}
.page hr{border:0;border-top:1px solid var(--rule);margin:26px 0}
.page .empty{color:var(--muted);font-style:italic}

/* the database subpage runs a live application */
.appframe{width:100%;height:1220px;border:1px solid var(--rule);border-radius:8px;background:#EDEFEE}
.appnote{
  background:var(--accent-soft);border-left:3px solid var(--accent);
  padding:11px 15px;border-radius:0 6px 6px 0;font-size:.86rem;margin:0 0 18px
}

/* ---------- pager ---------- */
.pager{display:flex;gap:14px;margin-top:52px;padding-top:20px;border-top:1px solid var(--rule)}
.pager a{
  flex:1;text-decoration:none;padding:13px 15px;border:1px solid var(--rule);
  border-radius:7px;color:var(--ink)
}
.pager a:hover{border-color:var(--accent);background:var(--wash)}
.pager .dir{display:block;font-size:.71rem;color:var(--muted);text-transform:uppercase;letter-spacing:.07em;margin-bottom:3px}
.pager .nx{text-align:right}

/* ---------- table of contents ---------- */
.toc{position:sticky;top:calc(var(--bar-h) + 26px);padding:26px 0;font-size:.8rem}
.toc h4{
  font-family:var(--mono);font-size:.68rem;text-transform:uppercase;letter-spacing:.09em;
  color:var(--muted);margin:0 0 10px;font-weight:400
}
.toc a{display:block;padding:4px 0 4px 11px;border-left:2px solid var(--rule);
  color:var(--muted);text-decoration:none;line-height:1.35}
.toc a:hover{color:var(--accent)}
.toc a.on{border-left-color:var(--accent);color:var(--accent)}
.toc a.h3{padding-left:22px;font-size:.76rem}

/* standing sidebar (landing page), in blocks */
.toc.rail{max-height:calc(100vh - var(--bar-h) - 40px);overflow-y:auto;padding-right:4px}
.toc.rail .rblock{margin:0 0 24px}
.toc.rail h4{color:var(--bronze);margin:0 0 8px}
.toc.rail .item{
  display:block;padding:9px 0 10px;border-left:0;border-bottom:1px solid var(--rule);
  text-decoration:none;color:var(--body-ink)
}
.toc.rail .item:last-of-type{border-bottom:0}
.toc.rail .item:hover .what{color:var(--accent)}
.toc.rail .when{
  display:block;font-family:var(--mono);font-size:.68rem;letter-spacing:.03em;
  color:var(--accent);margin-bottom:3px
}
.toc.rail .what{display:block;font-size:.82rem;line-height:1.36;color:var(--ink)}
.toc.rail .where{display:block;font-size:.75rem;color:var(--muted);margin-top:2px}
.toc.rail .note{display:block;font-size:.75rem;color:var(--muted);margin-top:4px;line-height:1.4}

/* the database block reads as a card, not a list entry */
.toc.rail .promo .item{
  border:1px solid var(--rule);border-radius:8px;background:var(--accent-soft);
  padding:12px 13px;border-bottom:1px solid var(--rule)
}
.toc.rail .promo .what{font-weight:600;color:var(--accent)}
.toc.rail .promo .note{color:var(--body-ink)}

.toc.rail .railmore{display:flex;flex-direction:column;gap:5px;margin-top:11px}
.toc.rail .railmore a{border:0;padding:0;font-size:.79rem;color:var(--accent);text-decoration:none}
.toc.rail .railmore a:hover{text-decoration:underline}

/* ---------- footer ---------- */
.foot{
  border-top:1px solid var(--rule);background:var(--wash);margin-top:30px;
  padding:26px 24px;font-size:.83rem;color:var(--muted);
  display:flex;gap:20px;flex-wrap:wrap;justify-content:space-between
}
.foot strong{color:var(--ink)}
.footlinks{display:flex;gap:20px;flex-wrap:wrap}

/* ---------- responsive ---------- */
@media (max-width:1080px){
  .shell{grid-template-columns:minmax(0,1fr);max-width:none}
  .toc{display:none}
}
@media (max-width:900px){
  .topnav{display:none}
  .iconbtn{display:flex}
  .searchwrap{width:auto;flex:1;margin-left:auto}
  .shell{padding:0 18px}
  .scrim{display:none}
}
@media (min-width:901px){
  .drawer{display:none}
}
@media (prefers-reduced-motion:reduce){*{scroll-behavior:auto}}