/* Shared styles for the project site. Light and dark follow prefers-color-scheme. */
:root{
  color-scheme:light;
  --bg:#fcfcfb; --surface:#ffffff; --plane:#f4f3ef; --text:#141414; --text-2:#4a4946; --muted:#6c6b66;
  --border:rgba(11,11,11,.11); --grid:#e1e0d9; --axis:#c3c2b7;
  --accent:#2a78d6; --accent-soft:rgba(42,120,214,.10); --red:#e34948; --red-soft:rgba(227,73,72,.10); --mid:#f0efec;
  --amber:#a86a00; --green:#2f7d4f;
  --pole0:#2a78d6; --pole1:#e34948;
  --shadow:0 1px 2px rgba(0,0,0,.04),0 4px 16px rgba(0,0,0,.05);
  --sans:system-ui,-apple-system,"Segoe UI",Roboto,"Helvetica Neue",Arial,sans-serif;
  --mono:ui-monospace,SFMono-Regular,Menlo,Consolas,monospace;
  --prose:72ch; --page:1240px;
}
@media (prefers-color-scheme:dark){:root{
  color-scheme:dark;
  --bg:#121211; --surface:#1a1a19; --plane:#0d0d0d; --text:#f0efec; --text-2:#c3c2b7; --muted:#9a9890;
  --border:rgba(255,255,255,.11); --grid:#2c2c2a; --axis:#383835;
  --accent:#3987e5; --accent-soft:rgba(57,135,229,.16); --red:#e66767; --red-soft:rgba(230,103,103,.14); --mid:#383835;
  --amber:#e0b04a; --green:#62c28a;
  --pole0:#3987e5; --pole1:#e66767;
  --shadow:none;
}}
*{box-sizing:border-box}
html{-webkit-text-size-adjust:100%;scroll-padding-top:72px}
body{margin:0;background:var(--bg);color:var(--text);font:16px/1.6 var(--sans)}
a{color:var(--accent);text-decoration:none}a:hover{text-decoration:underline}
img,video{max-width:100%}
code,kbd,.mono{font-family:var(--mono);font-size:.9em}
code{background:var(--plane);border:1px solid var(--border);border-radius:5px;padding:0 .3em}
h1,h2,h3,h4{line-height:1.25;font-weight:650;letter-spacing:-.01em}
h1{font-size:clamp(28px,3.4vw,42px);margin:.2em 0 .4em}
h2{font-size:clamp(22px,2.2vw,28px);margin:2.2em 0 .6em}
h3{font-size:19px;margin:1.8em 0 .5em}
h4{font-size:16px;margin:1.4em 0 .4em}
p{margin:.7em 0}
hr{border:0;border-top:1px solid var(--border);margin:2.5em 0}
.wrap{max-width:var(--page);margin:0 auto;padding:0 24px}
.muted{color:var(--muted)}.small{font-size:14px}.tiny{font-size:12.5px}
.lede{font-size:clamp(17px,1.5vw,20px);color:var(--text-2);max-width:62ch;line-height:1.55}

/* header */
.site-head{position:sticky;top:0;z-index:30;background:color-mix(in srgb,var(--bg) 92%,transparent);backdrop-filter:saturate(1.4) blur(8px);border-bottom:1px solid var(--border)}
.site-head .wrap{display:flex;align-items:center;gap:24px;min-height:56px}
.brand{font-weight:650;color:var(--text);white-space:nowrap;font-size:15.5px}
.brand:hover{text-decoration:none}
.brand small{display:block;font-weight:400;color:var(--muted);font-size:12px;line-height:1.2}
.site-nav{display:flex;gap:4px;margin-left:auto;overflow-x:auto;scrollbar-width:none}
.site-nav::-webkit-scrollbar{display:none}
.site-nav a{color:var(--text-2);padding:7px 12px;border-radius:8px;font-size:14.5px;white-space:nowrap}
.site-nav a:hover{background:var(--plane);text-decoration:none;color:var(--text)}
.site-nav a[aria-current=page]{color:var(--text);background:var(--plane);font-weight:600}
@media (max-width:760px){
  .site-head{position:static}
  .site-head .wrap{flex-direction:column;align-items:stretch;gap:0;padding:6px 12px 0}
  .brand{padding:4px 2px}.brand small{display:none}
  .site-nav{margin:0 -4px;padding-bottom:6px;flex-wrap:wrap;overflow:visible}.site-nav a{padding:5px 9px;font-size:14px}
  html{scroll-padding-top:12px}
  .wrap{padding:0 16px}
}

/* footer */
.site-foot{border-top:1px solid var(--border);margin-top:72px;padding:28px 0 48px;color:var(--muted);font-size:14px}
.site-foot .wrap{display:flex;flex-wrap:wrap;gap:8px 28px;justify-content:space-between}

/* generic blocks */
.page-head{padding:40px 0 8px}
.page-head .lede{margin-top:0}
.kicker{font-size:13px;letter-spacing:.06em;text-transform:uppercase;color:var(--muted);font-weight:600;margin:0}
.card{background:var(--surface);border:1px solid var(--border);border-radius:12px;padding:18px 20px;box-shadow:var(--shadow)}
.grid{display:grid;gap:16px}
.g2{grid-template-columns:repeat(2,minmax(0,1fr))}.g3{grid-template-columns:repeat(3,minmax(0,1fr))}.g4{grid-template-columns:repeat(4,minmax(0,1fr))}
@media (max-width:1100px){.g4{grid-template-columns:repeat(2,minmax(0,1fr))}.g3{grid-template-columns:repeat(2,minmax(0,1fr))}}
@media (max-width:680px){.g2,.g3,.g4{grid-template-columns:1fr}}
.btn{display:inline-flex;align-items:center;gap:8px;border:1px solid var(--border);background:var(--surface);color:var(--text);border-radius:999px;padding:8px 16px;font:inherit;font-size:14.5px;cursor:pointer}
.btn:hover{text-decoration:none;border-color:var(--axis)}
.btn.primary{background:var(--text);color:var(--bg);border-color:var(--text)}
.chip{display:inline-block;font-size:12px;line-height:1.5;border-radius:999px;padding:0 8px;margin:2px 4px 2px 0;border:1px solid var(--border);color:var(--text-2);white-space:nowrap}
.chip.associated,.chip.measured{border-color:var(--accent);color:var(--accent)}
.chip.attributed,.chip.hypothesis{border-color:var(--amber);color:var(--amber)}
.chip.intervened{border-color:var(--green);color:var(--green)}
.chip.flag{border-color:var(--red);color:var(--red)}
.chip.checked{border-color:var(--green);color:var(--green)}
.chip.proposed{border-color:var(--amber);color:var(--amber)}
.chip.unclear{border-color:var(--muted);color:var(--muted)}

/* tables */
.table-wrap{overflow-x:auto;margin:1em 0;border:1px solid var(--border);border-radius:10px;background:var(--surface)}
table.data{border-collapse:collapse;width:100%;font-size:14.5px;font-variant-numeric:tabular-nums}
table.data th,table.data td{padding:8px 12px;text-align:left;vertical-align:top;border-bottom:1px solid var(--grid)}
table.data tr:last-child td{border-bottom:0}
table.data th{font-weight:600;background:var(--plane);font-size:13.5px;color:var(--text-2)}
table.data td.num,table.data th.num{text-align:right;white-space:nowrap}
table.data tr.hl td{background:var(--accent-soft)}
caption{caption-side:bottom;text-align:left;font-size:13px;color:var(--muted);padding:8px 12px}

/* prose */
.prose{max-width:var(--prose)}
.prose ul,.prose ol{padding-left:1.3em}.prose li{margin:.35em 0}
.prose .table-wrap{max-width:none}
.note{border-left:3px solid var(--axis);padding:4px 0 4px 14px;color:var(--text-2);margin:1.2em 0}
.note.caveat{border-color:var(--amber)}
.callout{background:var(--plane);border:1px solid var(--border);border-radius:10px;padding:14px 18px;margin:1.2em 0}
.callout p:first-child{margin-top:0}.callout p:last-child{margin-bottom:0}
.stat{font-size:clamp(24px,2.4vw,30px);font-weight:650;letter-spacing:-.02em;line-height:1.15;font-variant-numeric:tabular-nums}

/* video */
.video-frame{position:relative;border-radius:12px;overflow:hidden;background:#121211;border:1px solid var(--border)}
.video-frame video{display:block;width:100%;height:auto;aspect-ratio:16/9;background:#121211}
figure{margin:0}figcaption{font-size:14px;color:var(--muted);margin-top:8px}

:focus-visible{outline:2px solid var(--accent);outline-offset:2px}
@media (prefers-reduced-motion:reduce){*{scroll-behavior:auto!important}}
.skip{position:absolute;left:-9999px;top:8px;z-index:100;background:var(--surface);color:var(--text);padding:8px 14px;border-radius:8px;border:1px solid var(--border)}
.skip:focus{left:12px}