/* surfingdog.pt: white, hairlines, type-led. Taken from the approved minimal design (platform/web/static,
   prototype v6/v7): same fonts, tokens and type sizes. One stylesheet for every page; no inline styles,
   which the site's Content-Security-Policy forbids. */
@font-face{font-family:"Geist";src:url("fonts/Geist-Variable.woff2") format("woff2"),local("Geist");font-weight:100 900;font-style:normal;font-display:swap}
@font-face{font-family:"Geist Mono";src:url("fonts/GeistMono-Variable.woff2") format("woff2"),local("Geist Mono");font-weight:100 900;font-style:normal;font-display:swap}

:root{
  --bg:#ffffff; --ink:#0a0a0a; --ink-2:#555555; --ink-3:#707070; --line:#ededed; --line-2:#e2e2e2;
  --hover:#f4f4f4; --code:#fafafa; --navy:#0b2350; --ok:#1f7a4d; --bad:#b4232e; --gold:#b08a2e;
  --glass:rgba(255,255,255,.86); --ring:rgba(10,10,10,.06); --border-hover:#cfcfcf; --bar:#0a0a0a; --bar-2:#cfcfcf;
  --d1:#3B6D11; --d2:#534AB7; --d3:#993C1D; --d4:#0F6E56; --d5:#854F0B; --d6:#185FA5; --d7:#993556; --d8:#5F5E5A; --edge:#cfcfcf;
  --sans:"Geist","Helvetica Neue",Arial,sans-serif; --mono:"Geist Mono",ui-monospace,Menlo,Consolas,monospace;
  --ease:cubic-bezier(.22,.61,.36,1); --top:61px;
  color-scheme:light;
}
@media (prefers-color-scheme:dark){:root:not([data-theme="light"]){
  --bg:#0a0a0a; --ink:#ededed; --ink-2:#a3a3a3; --ink-3:#8f8f8f; --line:#1d1d1d; --line-2:#2a2a2a;
  --hover:#161616; --code:#101010; --navy:#a9bff0; --ok:#45b07f; --bad:#ec5f69; --gold:#d3ad58;
  --glass:rgba(10,10,10,.82); --ring:rgba(237,237,237,.08); --border-hover:#3a3a3a; --bar:#ededed; --bar-2:#3a3a3a;
  --d1:#97C459; --d2:#AFA9EC; --d3:#F0997B; --d4:#5DCAA5; --d5:#EF9F27; --d6:#85B7EB; --d7:#ED93B1; --d8:#B4B2A9; --edge:#3a3a3a;
  color-scheme:dark}}
:root[data-theme="dark"]{
  --bg:#0a0a0a; --ink:#ededed; --ink-2:#a3a3a3; --ink-3:#8f8f8f; --line:#1d1d1d; --line-2:#2a2a2a;
  --hover:#161616; --code:#101010; --navy:#a9bff0; --ok:#45b07f; --bad:#ec5f69; --gold:#d3ad58;
  --glass:rgba(10,10,10,.82); --ring:rgba(237,237,237,.08); --border-hover:#3a3a3a; --bar:#ededed; --bar-2:#3a3a3a;
  --d1:#97C459; --d2:#AFA9EC; --d3:#F0997B; --d4:#5DCAA5; --d5:#EF9F27; --d6:#85B7EB; --d7:#ED93B1; --d8:#B4B2A9; --edge:#3a3a3a;
  color-scheme:dark}

*{box-sizing:border-box}
html{background:var(--bg);-webkit-font-smoothing:antialiased;text-rendering:optimizeLegibility;scroll-padding-top:calc(var(--top) + 16px);-webkit-text-size-adjust:100%}
body{margin:0;color:var(--ink);background:var(--bg);font-family:var(--sans);font-size:15px;line-height:1.65;letter-spacing:-.003em}
a{color:inherit;text-decoration-color:var(--line-2);text-underline-offset:3px;transition:text-decoration-color .2s}
a:hover{text-decoration-color:var(--ink)}
:focus-visible{outline:2px solid var(--navy);outline-offset:2px;border-radius:4px}
.skip{position:absolute;left:-9999px}.skip:focus{left:12px;top:10px;z-index:30;background:var(--ink);color:var(--bg);padding:6px 10px;border-radius:6px}
code{font-family:var(--mono);font-size:13px}

/* The header: the same menu on every page, always visible. */
header.top{position:sticky;top:0;z-index:20;background:var(--glass);-webkit-backdrop-filter:saturate(180%) blur(12px);backdrop-filter:saturate(180%) blur(12px);border-bottom:1px solid var(--line)}
.bar{max-width:1240px;margin:0 auto;min-height:60px;display:flex;align-items:center;flex-wrap:wrap;gap:4px 28px;padding:0 max(24px,env(safe-area-inset-right,0px)) 0 max(24px,env(safe-area-inset-left,0px))}
.word{font-weight:600;font-size:15px;letter-spacing:-.01em;text-decoration:none;display:flex;align-items:center;gap:10px}
.word i{width:7px;height:7px;border-radius:50%;background:var(--ink);display:inline-block}
.links{display:flex;gap:22px;font-size:14px;color:var(--ink-2);margin-left:auto}
.links a{text-decoration:none;transition:color .2s;padding:4px 0;border-bottom:1px solid transparent}
.links a:hover{color:var(--ink)}
.links a[aria-current]{color:var(--ink);border-bottom-color:var(--ink)}
@media (max-width:620px){.bar{padding-top:10px;padding-bottom:6px}.links{margin-left:0;width:100%;gap:20px}:root{--top:83px}}

/* Pages: a paper column, with contents on the right on wide screens. */
.page{max-width:1240px;margin:0 auto;padding:0 max(24px,env(safe-area-inset-right,0px)) 0 max(24px,env(safe-area-inset-left,0px))}
.doc{display:grid;grid-template-columns:minmax(0,700px);justify-content:center;gap:72px}
@media (min-width:1100px){.doc.has-toc{grid-template-columns:minmax(0,700px) 190px}}
main{padding:56px 0 120px;min-width:0}
.crumb{font-size:13px;color:var(--ink-3);margin:0 0 14px}
.crumb a{text-decoration:none}.crumb a:hover{color:var(--ink)}
h1{font-size:26px;line-height:1.2;letter-spacing:-.02em;font-weight:600;margin:0 0 14px;text-wrap:pretty}
@media (max-width:620px){h1{font-size:22px}}
.lede{font-size:18px;line-height:1.55;color:var(--ink-2);margin:0 0 22px;letter-spacing:-.01em}
.meta{display:flex;flex-wrap:wrap;gap:6px 18px;font-size:13px;color:var(--ink-3);margin:0 0 40px}
.meta span{display:inline-flex;align-items:center;gap:7px}
.dot{width:6px;height:6px;border-radius:50%;display:inline-block;flex:none;background:var(--ink-3)}
.dot.ok{background:var(--ok)}.dot.bad{background:var(--bad)}.dot.gold{background:var(--gold)}
.dot.k1{background:var(--d1)}.dot.k2{background:var(--d2)}.dot.k3{background:var(--d3)}.dot.k4{background:var(--d4)}
.dot.k5{background:var(--d5)}.dot.k6{background:var(--d6)}.dot.k7{background:var(--d7)}.dot.k8{background:var(--d8)}
h2{font-size:19px;line-height:1.3;letter-spacing:-.015em;font-weight:600;margin:56px 0 12px;position:relative}
h2 a.anchor{position:absolute;left:-22px;top:0;color:var(--ink-3);text-decoration:none;opacity:0;transition:opacity .2s}
h2:hover a.anchor{opacity:1}
h3{font-size:16px;font-weight:600;letter-spacing:-.01em;margin:32px 0 8px}
p{margin:0 0 16px}
ul,ol{margin:0 0 16px;padding-left:20px}
li{margin:4px 0}
.small{font-size:13px;color:var(--ink-3)}
.muted{color:var(--ink-2)}
.num{font-family:var(--mono);font-variant-numeric:tabular-nums;font-size:13.5px}
.note{font-size:14px;color:var(--ink-2);border-left:2px solid var(--ink);padding:2px 0 2px 14px;margin:24px 0}
.stamp{font-size:13px;color:var(--ink-2);display:flex;align-items:center;gap:8px;margin:0 0 32px}
.stamp b{font-weight:600;color:var(--ink);letter-spacing:.01em}

/* The paper: numbered sections and figures. */
.paper{counter-reset:sec fig tab}
.paper h2{counter-increment:sec}
.paper h2::before{content:counter(sec) ".";font-family:var(--mono);font-size:14px;font-weight:400;color:var(--ink-3);display:inline-block;width:30px}
@media (min-width:900px){.paper h2::before{position:absolute;left:-38px;top:3px;width:auto}}
.paper h2.unnumbered{counter-increment:none}.paper h2.unnumbered::before{content:none}
.abstract{border-top:1px solid var(--line);border-bottom:1px solid var(--line);padding:18px 0;margin:8px 0 40px}
.abstract p{margin:0;font-size:15.5px}
.abstract .label{font-size:12px;color:var(--ink-3);margin-bottom:6px}
figure{margin:28px 0 32px;padding:20px 0 0;border-top:1px solid var(--line)}
figcaption{font-size:13px;color:var(--ink-3);margin-top:14px;line-height:1.5}
.paper figure figcaption::before{counter-increment:fig;content:"Figure " counter(fig) ". ";color:var(--ink);font-weight:500}
.paper .tcap{font-size:13px;color:var(--ink-3);margin:24px 0 6px}
.paper .tcap::before{counter-increment:tab;content:"Table " counter(tab) ". ";color:var(--ink);font-weight:500}
ol.points{list-style:none;counter-reset:pt;padding:0;margin:8px 0 0}
ol.points li{counter-increment:pt;position:relative;display:block;padding:12px 0 12px 34px;border-bottom:1px solid var(--line);margin:0}
ol.points li::before{content:counter(pt,decimal-leading-zero);position:absolute;left:0;top:14px;font-family:var(--mono);font-size:12.5px;color:var(--ink-3)}
ol.points li:first-child{border-top:1px solid var(--line)}
ol.points b{font-weight:600}

/* Tables */
.tbl-wrap{overflow-x:auto}
.tbl{width:100%;border-collapse:collapse;font-size:14px;margin:8px 0 14px}
.tbl th{font-weight:500;color:var(--ink-3);font-size:12.5px;text-align:left;padding:0 16px 10px 0;border-bottom:1px solid var(--line-2);vertical-align:bottom}
.tbl td{padding:12px 16px 12px 0;border-bottom:1px solid var(--line);vertical-align:top}
.tbl tr:last-child td{border-bottom:0}
.tbl th:last-child,.tbl td:last-child{padding-right:0}
.tbl .r{text-align:right}
.tbl td.k{color:var(--ink-3);font-family:var(--mono);font-size:12.5px;white-space:nowrap}
@media (max-width:620px){.tbl.stack thead{display:none}.tbl.stack tr{display:block;border-bottom:1px solid var(--line);padding:10px 0}.tbl.stack td{display:block;border:0;padding:2px 0}.tbl.stack td.k{padding-bottom:4px}}

/* Facts */
dl.facts{display:grid;grid-template-columns:170px minmax(0,1fr);gap:0;margin:8px 0 0;font-size:14px;border-top:1px solid var(--line)}
dl.facts dt,dl.facts dd{padding:11px 0;border-bottom:1px solid var(--line);margin:0}
dl.facts dt{color:var(--ink-3)}
dl.facts dd{color:var(--ink);min-width:0;overflow-wrap:anywhere}
@media (max-width:620px){dl.facts{grid-template-columns:1fr}dl.facts dt{border-bottom:0;padding-bottom:0}dl.facts dd{padding-top:2px}}
.tag{display:inline-flex;align-items:center;gap:6px;font-size:12.5px;color:var(--ink-2);margin-right:14px;white-space:nowrap}
.mono{font-family:var(--mono);font-size:12.5px}

/* Charts: bars are SVG shapes sized by attribute. */
.bars{display:grid;gap:8px;margin:12px 0}
.bars .row{display:grid;grid-template-columns:minmax(0,1fr) 110px;gap:4px 14px;align-items:center;font-size:14px}
@media (min-width:700px){.bars .row{grid-template-columns:220px minmax(0,1fr) 110px}}
.bars .row svg{display:block;width:100%;height:6px;grid-column:1 / -1}
@media (min-width:700px){.bars .row svg{grid-column:auto}}
.bars rect{fill:var(--bar)}.bars rect.soft{fill:var(--bar-2)}
.bars .v{font-family:var(--mono);font-size:12.5px;color:var(--ink-2);text-align:right;white-space:nowrap}
@media (max-width:699px){.bars .v{grid-row:1;grid-column:2}}
.cols{margin:12px 0 6px}
.cols svg{display:block;width:100%;height:140px;border-bottom:1px solid var(--line-2)}
.cols rect{fill:var(--bar-2)}.cols rect.hi{fill:var(--bar)}
.cols .yrs{display:flex;margin-top:6px}
.cols .yrs span{flex:1;text-align:center;font-family:var(--mono);font-size:10.5px;color:var(--ink-3);min-width:0}
.cols .ends{display:flex;justify-content:space-between;font-family:var(--mono);font-size:11.5px;color:var(--ink-3);margin-bottom:4px}
.figs{display:grid;grid-template-columns:repeat(3,minmax(0,1fr));border-top:1px solid var(--line);border-bottom:1px solid var(--line);margin:18px 0}
.figs div{padding:14px 16px 14px 0}
.figs b{display:block;font-size:22px;font-weight:600;letter-spacing:-.02em;font-variant-numeric:tabular-nums}
.figs span{font-size:12.5px;color:var(--ink-3)}
@media (max-width:620px){.figs{grid-template-columns:1fr}.figs div{border-bottom:1px solid var(--line)}.figs div:last-child{border-bottom:0}}

/* Diagrams: hairline boxes, no fills. */
.dg{display:grid;gap:6px;font-size:13.5px;line-height:1.4}
.box{border:1px solid var(--line-2);border-radius:8px;padding:10px 12px;background:var(--bg)}
.box b{display:block;font-weight:600}
.box span{display:block;color:var(--ink-3);font-size:12.5px}
.box.strong{border-color:var(--ink)}
.box.dash{border-style:dashed}
.arrow{color:var(--ink-3);text-align:center;font-family:var(--mono);font-size:12px;line-height:1;padding:4px 0}
.dg-model{grid-template-columns:1fr}
@media (min-width:760px){.dg-model{grid-template-columns:200px 28px minmax(0,1fr);align-items:center}}
.dg-body{border:1px dashed var(--ink-3);border-radius:12px;padding:12px;display:grid;gap:6px}
.dg-body .label{font-size:11.5px;color:var(--ink-3);text-transform:uppercase;letter-spacing:.06em}
.dg-row{display:grid;grid-template-columns:1fr;gap:6px}
@media (min-width:760px){.dg-row{grid-template-columns:1fr 20px 1fr 20px 1fr;align-items:center}.dg-row .arrow.h{transform:none}}
.arrow.h{transform:rotate(90deg)}
@media (min-width:760px){.dg-model>.arrow.h{transform:none}}
.dg-3{display:grid;grid-template-columns:1fr;gap:10px}
@media (min-width:760px){.dg-3{grid-template-columns:repeat(3,minmax(0,1fr))}}
.dg-3 .box p{margin:6px 0 0;font-size:12.5px;color:var(--ink-2)}
.dg-3 .box p.w{border-top:1px solid var(--line);padding-top:6px;color:var(--ink)}
.dg-road{display:grid;grid-template-columns:1fr;gap:6px}
@media (min-width:760px){.dg-road{grid-template-columns:1fr 16px 1fr 16px 1fr 16px 1fr;align-items:stretch}.dg-road .arrow{align-self:center}.dg-road .arrow.h{transform:none}}

/* Lists of links and sources */
ol.sources{list-style:none;counter-reset:src;padding:0;margin:8px 0 0;font-size:14px}
ol.sources li{counter-increment:src;position:relative;display:block;padding:9px 0 9px 34px;border-bottom:1px solid var(--line);margin:0;overflow-wrap:break-word}
ol.sources li::before{content:counter(src);position:absolute;left:0;top:11px;font-family:var(--mono);font-size:12.5px;color:var(--ink-3)}
ul.plain{list-style:none;padding:0;margin:8px 0 0}
ul.plain li{padding:8px 0;border-bottom:1px solid var(--line);margin:0;font-size:14px}
ul.plain li small{display:block;color:var(--ink-3);font-size:12.5px}
.cols-2{display:grid;grid-template-columns:1fr;gap:0 40px}
@media (min-width:760px){.cols-2{grid-template-columns:1fr 1fr}}

/* Contents on the right */
aside.toc{position:sticky;top:var(--top);align-self:start;padding:56px 0 0;font-size:13px;display:none}
@media (min-width:1100px){aside.toc{display:block}}
.toc-t{color:var(--ink-3);font-size:12px;font-weight:500;margin-bottom:10px}
aside.toc ul{list-style:none;margin:0;padding:0 0 0 12px;border-left:1px solid var(--line)}
aside.toc li{margin:0}
aside.toc a{display:block;padding:4px 0;color:var(--ink-3);text-decoration:none;transition:color .2s}
aside.toc a:hover,aside.toc a.on{color:var(--ink)}

/* Home */
.parts{list-style:none;padding:0;margin:32px 0 0;border-top:1px solid var(--line)}
.parts li{margin:0;border-bottom:1px solid var(--line)}
.parts a{display:grid;grid-template-columns:34px minmax(0,1fr);gap:0;padding:18px 0;text-decoration:none;transition:background .2s}
.parts a:hover{background:var(--hover)}
.parts .n{font-family:var(--mono);font-size:12.5px;color:var(--ink-3);padding-top:3px}
.parts b{display:block;font-size:17px;font-weight:600;letter-spacing:-.01em}
.parts span{display:block;color:var(--ink-2);font-size:14px;margin-top:2px}

/* Wiki entries */
.ego{margin:14px 0 6px}
.ego svg{display:block;width:100%;height:auto}
.ego line{stroke:var(--edge);stroke-width:1}
.ego text{font-family:var(--sans);font-size:11px;fill:var(--ink-2)}
.ego .c1{fill:var(--d1)}.ego .c2{fill:var(--d2)}.ego .c3{fill:var(--d3)}.ego .c4{fill:var(--d4)}
.ego .c5{fill:var(--d5)}.ego .c6{fill:var(--d6)}.ego .c7{fill:var(--d7)}.ego .c8{fill:var(--d8)}
.ego .me{fill:var(--ink)}
.conn-group h3{margin:24px 0 4px;font-size:14px}
.conn-group h3 small{font-family:var(--mono);font-weight:400;color:var(--ink-3);margin-left:6px}
.idx-area h2 small{font-family:var(--mono);font-size:13px;font-weight:400;color:var(--ink-3);margin-left:8px}
ul.idx{list-style:none;padding:0;margin:8px 0 0;columns:1}
@media (min-width:760px){ul.idx{columns:2;column-gap:40px}}
ul.idx li{break-inside:avoid;padding:6px 0;border-bottom:1px solid var(--line);margin:0;font-size:14px}
ul.idx li small{color:var(--ink-3);font-size:12.5px;margin-left:6px}

/* Motion only in details: content fades in once, bars grow. Visible without JS. */
.anim main>*{opacity:0;transform:translateY(5px)}
.anim.ready main>*{opacity:1;transform:none;transition:opacity .6s var(--ease),transform .6s var(--ease)}
@keyframes grow{from{transform:scaleX(0)}to{transform:scaleX(1)}}
@keyframes rise{from{transform:scaleY(0)}to{transform:scaleY(1)}}
.ready .bars rect{transform-box:fill-box;transform-origin:left;animation:grow 1s var(--ease) both}
.ready .cols rect{transform-box:fill-box;transform-origin:bottom;animation:rise 1s var(--ease) both}
@media (prefers-reduced-motion:reduce){.anim main>*{opacity:1!important;transform:none!important}*,*::before,*::after{transition:none!important;animation:none!important}}

footer.foot{border-top:1px solid var(--line);color:var(--ink-3);font-size:12.5px}
footer.foot .in{max-width:1240px;margin:0 auto;padding:22px max(24px,env(safe-area-inset-right,0px)) 32px max(24px,env(safe-area-inset-left,0px));display:flex;justify-content:space-between;gap:8px 16px;flex-wrap:wrap}
footer.foot p{margin:0}
/* The home page's question: one line wherever the column allows (about 31.5 em of text), down to 20px, then it wraps. */
h1.q{font-size:clamp(20px,calc((100vw - 72px) / 31.5),22px)}