:root{
  --bg:#f5f8fc;
  --bg-soft:#eef3f9;
  --panel:#ffffff;
  --panel-2:#eef3f9;
  --line:rgba(20,35,55,.10);
  --line-2:#dde4ec;
  --text:#16222e;
  --muted:#5d6e7d;
  --teal:#0fa9a1;
  --green:#1aa55f;
  --blue:#2f7fe0;
  --accent:#0fa9a1;
  --radius:18px;
  --max:1120px;
  --mono:'IBM Plex Mono',monospace;
  --display:'Space Grotesk',sans-serif;
  --nav-offset:80px;
}
*{box-sizing:border-box;margin:0;padding:0}
html{scroll-behavior:smooth;scroll-padding-top:var(--nav-offset)}
body{
  background:var(--bg);
  color:var(--text);
  font-family:'Inter',system-ui,sans-serif;
  line-height:1.6;
  overflow-x:hidden;
  -webkit-font-smoothing:antialiased;
}

/* aurora background — soft pastel wash on light */
.aurora{position:fixed;inset:0;z-index:-2;overflow:hidden}
.blob{position:absolute;border-radius:50%;filter:blur(120px);opacity:.28}
.b1{width:560px;height:560px;background:var(--teal);top:-160px;left:-120px;animation:float 18s ease-in-out infinite}
.b2{width:520px;height:520px;background:var(--blue);top:30%;right:-180px;animation:float 22s ease-in-out infinite reverse}
.b3{width:480px;height:480px;background:var(--green);bottom:-180px;left:30%;animation:float 26s ease-in-out infinite}
@keyframes float{0%,100%{transform:translate(0,0)}50%{transform:translate(40px,-40px)}}
body::after{content:"";position:fixed;inset:0;z-index:-1;background:radial-gradient(circle at 50% 0%,transparent,var(--bg) 72%)}

/* nav */
.nav{
  position:sticky;top:0;z-index:50;
  display:flex;align-items:center;justify-content:space-between;
  padding:16px clamp(18px,5vw,48px);
  backdrop-filter:blur(12px);
  background:rgba(245,248,252,.65);
  border-bottom:1px solid transparent;
  transition:border-color .3s,background .3s;
}
.nav.scrolled{border-color:var(--line);background:rgba(245,248,252,.9)}
.brand{display:flex;align-items:center;gap:10px;font-family:var(--display);font-weight:600;color:var(--text);text-decoration:none;font-size:.95rem}
.brand-mark{width:14px;height:14px;border-radius:4px;background:linear-gradient(135deg,var(--teal),var(--blue));box-shadow:0 0 16px rgba(15,169,161,.5)}
.nav-links{display:flex;gap:26px}
.nav-links a{color:var(--muted);text-decoration:none;font-size:.9rem;transition:color .2s}
.nav-links a:hover{color:var(--text)}
.nav-toggle{display:none;background:none;border:none;color:var(--text);font-size:1.4rem;cursor:pointer}

/* layout */
main{max-width:var(--max);margin:0 auto;padding:0 clamp(18px,5vw,32px)}
section{padding:clamp(38px,5.5vw,68px) 0}
.section-title{font-family:var(--display);font-size:clamp(1.5rem,3.4vw,2.3rem);font-weight:600;margin-bottom:30px;letter-spacing:-.01em}

/* ===== hero — lab-style typed headline (left aligned, mono) ===== */
.hero{padding-top:clamp(48px,8vw,96px);padding-bottom:clamp(30px,5vw,56px)}
.tag-line{font-family:var(--mono);color:var(--green);font-size:.85rem;margin-bottom:18px}
.hero h1{font-family:var(--mono);font-weight:600;font-size:clamp(1.7rem,4.6vw,3rem);line-height:1.15;letter-spacing:-.01em;min-height:1.2em;color:var(--text)}
.cursor{color:var(--green);animation:blink 1s steps(1) infinite}
@keyframes blink{50%{opacity:0}}
.sub{max-width:64ch;color:#3c4b59;font-size:1.08rem;margin:24px 0 14px}
.hl{color:var(--green);font-weight:600}
.authors{font-family:var(--mono);color:var(--muted);font-size:.92rem;margin-bottom:30px}
.authors a{color:var(--muted);text-decoration:none;border-bottom:1px solid transparent;transition:color .2s,border-color .2s}
.authors a:hover{color:var(--green);border-bottom-color:var(--green)}
.cta{display:flex;gap:14px;flex-wrap:wrap}
.btn{
  padding:12px 24px;border-radius:999px;border:1px solid var(--line);
  color:var(--text);text-decoration:none;font-weight:500;font-size:.95rem;
  background:#fff;transition:transform .2s,border-color .2s,box-shadow .2s;
}
.has-icon{display:inline-flex;align-items:center;gap:8px}
.icon{width:1.05em;height:1.05em;flex:0 0 auto;vertical-align:-.14em}
.icon-fill{fill:currentColor}
.hf-logo{width:1.25em;height:1.18em;object-fit:contain}
.btn:hover{transform:translateY(-2px);border-color:var(--teal);box-shadow:0 8px 22px rgba(15,169,161,.14)}
.btn.primary{background:linear-gradient(110deg,var(--teal),var(--blue));color:#fff;border-color:transparent;font-weight:600}
.btn.primary:hover{box-shadow:0 10px 30px rgba(47,127,224,.3)}

/* ===== interactive explorer (fusion) ===== */
.explorer{padding-top:clamp(24px,3.4vw,42px)}
.explorer-head{margin-bottom:6px}
.finding-no{font-family:var(--mono);font-size:.76rem;letter-spacing:.18em;text-transform:uppercase;color:var(--teal)}
.explorer-head .section-title{margin:10px 0 8px}
.explorer-sub{color:var(--muted);margin-bottom:24px;font-size:1rem}
.tabs{display:flex;gap:8px;flex-wrap:wrap}
.tab{font-family:var(--mono);cursor:pointer;background:var(--bg-soft);color:var(--muted);border:1px solid var(--line-2);border-bottom:none;padding:12px 20px;border-radius:10px 10px 0 0;font-size:.86rem;white-space:nowrap;transition:color .2s,background .2s}
.tab:hover{color:var(--text)}
.tab.active{color:var(--green);background:#fff;border-color:var(--green);position:relative;top:1px}
.explorer-body{display:grid;grid-template-columns:1.3fr 1fr;border:1px solid var(--line-2);border-radius:0 12px 12px 12px;background:#fff;overflow:hidden;box-shadow:0 16px 40px -28px rgba(20,40,70,.5)}
/* canvas panel: "lagoon" wash — soft teal→blue→light diagonal, distinct from the page bg */
.canvas-wrap{
  display:flex;flex-direction:column;justify-content:center;
  padding:18px 18px 10px;border-right:1px solid var(--line-2);
  background:
    linear-gradient(135deg,rgba(15,169,161,.11),rgba(47,127,224,.045) 46%,rgba(255,255,255,.82)),
    #edf5fa;
}
#curve{width:100%;height:320px;display:block;margin:0 auto}
.explorer-info{display:grid;grid-template-rows:auto 1fr auto 1fr auto 1fr auto;align-items:center;padding:32px 28px}
.axis-x{font-family:var(--mono);font-size:14px;color:var(--muted);margin:-4px auto 0;text-align:center}
.axis-copy,.axis-takeaway{display:contents}
.explorer-info h3{grid-row:1;align-self:start;font-family:var(--mono);font-size:1.48rem;color:var(--text);margin-bottom:0;max-width:34ch}
.explorer-info p#axisDesc{grid-row:3;color:#42505d;font-size:1rem;margin-bottom:0}
.verdict{grid-row:5;align-self:center;display:flex;align-items:center;gap:12px;margin-bottom:0}
.verdict-label{font-family:var(--mono);font-size:.76rem;text-transform:uppercase;letter-spacing:.15em;color:var(--muted);border:1px solid var(--line-2);padding:5px 9px;border-radius:5px}
.verdict-val{font-family:var(--mono);color:var(--green);font-weight:600;font-size:1.02rem}
.readme{grid-row:7;align-self:end;font-family:var(--mono);font-size:.9rem;color:var(--teal);background:var(--bg-soft);border-radius:8px;padding:14px 16px;border:1px solid var(--line-2)}

/* ===== figure cards — clean elevated white on light ===== */
.fig-card{
  position:relative;
  background:#fff;
  border-radius:20px;
  padding:clamp(8px,1.2vw,14px);
  border:1px solid var(--line);
  box-shadow:0 18px 50px -26px rgba(28,80,120,.5);
  transition:transform .35s ease,box-shadow .35s ease;
}
.fig-card img{display:block;width:100%;height:auto;border-radius:10px}
.figure-hero{padding-top:clamp(20px,4vw,40px);padding-bottom:clamp(20px,3vw,34px)}
.fig-card.wide{margin:0 auto}
.caption{color:var(--muted);font-size:.9rem;margin-top:18px;max-width:70ch}

/* axes cards */
.axes{padding-top:clamp(12px,2.2vw,26px)}
.cards{display:grid;grid-template-columns:repeat(3,1fr);gap:22px}
.card{
  position:relative;display:flex;flex-direction:column;padding:30px 26px;border-radius:var(--radius);
  background:#fff;
  border:1px solid var(--line);overflow:hidden;transition:transform .25s,border-color .25s,box-shadow .25s;
  box-shadow:0 10px 30px -22px rgba(20,40,70,.5);
}
.card:hover{transform:translateY(-6px);border-color:rgba(15,169,161,.5);box-shadow:0 18px 40px -24px rgba(20,40,70,.5)}
.card::before{content:"";position:absolute;top:0;left:0;right:0;height:3px;background:linear-gradient(90deg,var(--teal),var(--green),var(--blue))}
.card-idx{font-family:var(--mono);color:var(--teal);font-size:.85rem;margin-bottom:14px}
.card h3{font-family:var(--display);font-size:1.25rem;margin-bottom:12px}
.card p{color:#42505d;font-size:.96rem;margin-bottom:18px}
.card strong{color:var(--text)}
.tag{display:inline-block;align-self:flex-start;margin-top:auto;font-family:var(--mono);font-size:.72rem;color:var(--muted);border:1px solid var(--line);border-radius:999px;padding:5px 12px}

/* findings */
.findings{padding-top:clamp(24px,3.4vw,42px)}
.finding{display:grid;grid-template-columns:1fr 1fr;gap:48px;align-items:center;margin-bottom:68px}
.finding.alt{direction:rtl}
.finding.alt>*{direction:ltr}
.finding-text h3{font-family:var(--display);font-size:clamp(1.4rem,3vw,1.9rem);margin:12px 0 16px;letter-spacing:-.01em}
.finding-text p{color:#42505d;font-size:1.02rem}
.finding-text code{font-family:var(--mono);font-size:.86em;background:var(--bg-soft);padding:1px 6px;border-radius:5px;color:var(--teal)}
.finding-fig:hover{transform:translateY(-4px);box-shadow:0 26px 60px -26px rgba(28,80,120,.55)}
.fig-pair{display:grid;grid-template-columns:repeat(2,minmax(0,1fr));gap:18px;align-items:center}
.fig-card.pair img{min-width:0}

/* appendix pointer — small mono note under a finding */
.appendix-note{
  display:flex;align-items:flex-start;gap:8px;
  font-family:var(--mono);font-size:.78rem;line-height:1.55;
  color:var(--muted);margin-top:14px;
}
.appendix-note::before{content:"→";color:var(--teal);flex:none}
.finding-text .appendix-note,.finding-head .appendix-note{margin-top:14px}

/* "builds on prior work" callout under the overview figure */
.builds-on{
  margin:34px 0 0;padding:18px 22px;border-radius:14px;
  border:1px dashed var(--line-2);background:var(--bg-soft);
  font-size:.95rem;color:#42505d;max-width:78ch;
}
.builds-on strong{color:var(--text)}
.builds-on a{color:var(--teal);text-decoration:none;transition:color .2s}
.builds-on a:hover{color:var(--accent)}

/* closing appendix pointer spanning the findings section */
.appendix-all{
  margin-top:8px;padding:18px 22px;border-radius:14px;
  border:1px dashed var(--line-2);background:var(--bg-soft);
  font-size:.92rem;color:#42505d;max-width:78ch;
}

/* full-width finding (wide figures: pretraining & transfer) */
.finding-wide{margin-bottom:68px}
.finding-head{max-width:78ch;margin-bottom:24px}
.finding-head h3{font-family:var(--display);font-size:clamp(1.4rem,3vw,1.9rem);margin:12px 0 14px;letter-spacing:-.01em}
.finding-head p{color:#42505d;font-size:1.04rem}
.finding-head code{font-family:var(--mono);font-size:.86em;background:var(--bg-soft);padding:1px 6px;border-radius:5px;color:var(--teal)}
.finding-text a,.finding-head a{color:var(--teal);text-decoration:none;transition:color .2s}
.finding-text a:hover,.finding-head a:hover{color:var(--accent)}
.finding-text a code,.finding-head a code{color:inherit}
.finding-wide .caption{margin-left:auto;margin-right:auto}

/* readout */
.readout{padding-top:clamp(28px,3.8vw,46px)}
.readout-inner{padding:clamp(34px,5vw,56px);border-radius:24px;border:1px solid var(--line);background:linear-gradient(135deg,rgba(15,169,161,.10),rgba(47,127,224,.07));box-shadow:0 14px 40px -28px rgba(20,40,70,.5)}
.readout-inner>p{max-width:68ch;color:#3c4b59;font-size:1.08rem;margin-bottom:30px}
.readout-points{list-style:none;display:grid;grid-template-columns:repeat(2,1fr);gap:16px}
.readout-points li{display:flex;gap:12px;align-items:flex-start;padding:16px 18px;border:1px solid var(--line);border-radius:14px;background:#fff;font-size:.96rem}
.readout-points span{color:var(--teal);font-size:1.2rem;line-height:1.3}

/* readout comparison table */
.table-wrap{margin-top:40px}
.table-head{margin-bottom:20px}
.table-head h3{font-family:var(--display);font-size:1.25rem;margin-bottom:8px}
.table-head p{color:var(--muted);font-size:.92rem;max-width:74ch}
.table-scroll{overflow-x:auto;border:1px solid var(--line);border-radius:var(--radius);background:#fff;box-shadow:0 14px 40px -28px rgba(20,40,70,.5)}
table.perf{width:100%;border-collapse:collapse;font-size:.92rem;min-width:680px}
table.perf th,table.perf td{padding:13px 16px;text-align:center;white-space:nowrap}
table.perf thead th{font-family:var(--display);font-weight:600;font-size:.86rem;color:var(--text);border-bottom:2px solid var(--line-2);vertical-align:bottom}
table.perf thead th span{display:block;font-family:var(--mono);font-size:.66rem;font-weight:500;letter-spacing:.06em;color:var(--muted);margin-top:3px}
table.perf .rowlabel{text-align:left;font-family:var(--mono);font-weight:500;font-size:.85rem;color:var(--text)}
table.perf tbody td{color:#42505d;font-variant-numeric:tabular-nums}
table.perf tbody tr:not(:last-child) th,table.perf tbody tr:not(:last-child) td{border-bottom:1px solid var(--line)}
table.perf tbody td strong{color:var(--green);font-weight:700}
table.perf .hl-col{background:rgba(15,169,161,.07)}
table.perf thead .hl-col{background:rgba(15,169,161,.10);border-top-right-radius:10px}
table.perf .row-avg th,table.perf .row-avg td{border-top:3px solid #c8d3de;border-bottom:3px solid #c8d3de;font-weight:600;color:var(--text)}
table.perf .row-params{font-size:.85rem}
table.perf .row-params td,table.perf .row-params .rowlabel{color:var(--muted)}
table.perf .row-params td strong{color:var(--text)}

/* resources */
.resources{padding-top:clamp(28px,3.8vw,46px)}
.res-grid{display:grid;grid-template-columns:repeat(auto-fit,minmax(180px,1fr));gap:18px;margin-bottom:50px}
.res{padding:26px 22px;border-radius:var(--radius);border:1px solid var(--line);background:#fff;text-decoration:none;color:var(--text);transition:transform .2s,border-color .2s,box-shadow .2s;box-shadow:0 10px 30px -24px rgba(20,40,70,.5)}
.res:hover{transform:translateY(-4px);border-color:var(--teal)}
.res h3{display:flex;align-items:center;gap:8px;font-family:var(--display);font-size:1.15rem;margin-bottom:6px}
.res h3 .icon{color:var(--teal)}
.res p{color:var(--muted);font-size:.88rem}

.dataset-note{color:var(--muted);font-size:.86rem;margin-top:14px;max-width:78ch}

/* Keep triple-click selection close to the text instead of spanning wide empty columns. */
.sub,
.caption,
.explorer-sub,
.finding-text p,
.finding-head p,
.readout-inner>p,
.table-head p,
.dataset-note,
.appendix-all,
.builds-on{
  width:fit-content;
}

.cite{border:1px solid var(--line);border-radius:var(--radius);overflow:hidden;background:#fff}
.cite-head{display:flex;justify-content:space-between;align-items:center;padding:16px 22px;background:var(--bg-soft);border-bottom:1px solid var(--line)}
.cite-head h3{font-family:var(--display);font-size:1rem}
.copy-btn{-webkit-appearance:none;appearance:none;cursor:pointer;flex:none;width:112px;background:var(--teal);color:#fff;border:none;border-radius:8px;padding:8px 0;font-family:inherit;line-height:1.2;font-weight:600;font-size:.85rem;text-align:center;white-space:nowrap;transition:background .2s}
.copy-btn:hover{background:#0c8f88}
.copy-btn:focus{outline:none}
.copy-btn:focus-visible{outline:2px solid rgba(15,169,161,.35);outline-offset:3px}
.copy-btn.done{background:var(--green)}
.cite pre{padding:22px;overflow-x:auto;font-family:var(--mono);font-size:.82rem;color:#2f4a5e;line-height:1.7}

/* footer */
.footer{padding:24px 20px;border-top:1px solid var(--line)}

/* reveal animation */
.reveal{opacity:0;transform:translateY(30px);transition:opacity .7s ease,transform .7s ease}
.reveal.in{opacity:1;transform:none}

/* responsive */
@media(max-width:860px){
  .nav-links{display:none}
  .nav-links.open{display:flex;position:absolute;top:100%;left:0;right:0;flex-direction:column;background:var(--panel);padding:20px clamp(18px,5vw,48px);gap:18px;border-bottom:1px solid var(--line)}
  .nav-toggle{display:block}
  .cards,.res-grid{grid-template-columns:1fr 1fr}
  .finding,.finding.alt{grid-template-columns:1fr;direction:ltr;gap:24px}
  .fig-pair{grid-template-columns:1fr}
  .readout-points{grid-template-columns:1fr}
  .explorer-body{grid-template-columns:1fr}
  .canvas-wrap{border-right:none;border-bottom:1px solid var(--line-2);padding:16px 14px 10px}
  #curve{height:260px}
  .axis-x{font-size:13px;margin:2px auto 0}
  .explorer-info{display:flex;flex-direction:column;gap:16px;padding:22px 18px}
  .axis-copy,.axis-takeaway{display:flex;flex-direction:column;gap:12px}
  .explorer-info h3{grid-row:auto;font-size:1.22rem;max-width:none}
  .explorer-info p#axisDesc{grid-row:auto;font-size:.96rem}
  .verdict{grid-row:auto;align-self:stretch;flex-wrap:wrap;gap:8px}
  .verdict-val{font-size:.94rem}
  .readme{grid-row:auto;align-self:stretch;font-size:.82rem;padding:12px 14px}
}
@media(max-width:520px){
  main{padding:0 16px}
  .cards,.res-grid{grid-template-columns:1fr}
  /* keep the three explorer tabs on one row */
  .tabs{flex-wrap:nowrap;gap:6px}
  .tab{flex:1 1 0;min-width:0;text-align:center;padding:12px 4px;font-size:.7rem;letter-spacing:-.01em}
  .tab-num,.tab-sep{display:none}
  #curve{height:220px}
  .canvas-wrap{padding:12px 10px 8px}
  .explorer-info{padding:18px 16px}
  .verdict-label{font-size:.68rem;padding:4px 7px}
  .verdict-val{font-size:.88rem}
  .readme{font-size:.78rem}
}
@media(prefers-reduced-motion:reduce){
  .reveal{opacity:1;transform:none;transition:none}
  .blob{animation:none}
  .cursor{animation:none}
}