@font-face{font-family:"Literata";font-style:normal;font-weight:300 700;font-display:swap;src:url(fonts/literata-latin.woff2?v=302a7106) format("woff2");unicode-range:U+0000-00FF,U+0131,U+0152-0153,U+02BB-02BC,U+02C6,U+02DA,U+02DC,U+0304,U+0308,U+0329,U+2000-206F,U+20AC,U+2122,U+2191,U+2193,U+2212,U+2215,U+FEFF,U+FFFD}
@font-face{font-family:"Literata";font-style:normal;font-weight:300 700;font-display:swap;src:url(fonts/literata-latin-ext.woff2?v=302a7106) format("woff2");unicode-range:U+0100-02BA,U+02BD-02C5,U+02C7-02CC,U+02CE-02D7,U+02DD-02FF,U+0304,U+0308,U+0329,U+1D00-1DBF,U+1E00-1E9F,U+1EF2-1EFF,U+2020,U+20A0-20AB,U+20AD-20C0,U+2113,U+2C60-2C7F,U+A720-A7FF}
@font-face{font-family:"Plex Sans";font-weight:400;font-display:swap;src:url(fonts/ibmplexsans-400-lat.woff2?v=302a7106) format("woff2");unicode-range:U+0000-00FF,U+2000-206F,U+2212}
@font-face{font-family:"Plex Sans";font-weight:400;font-display:swap;src:url(fonts/ibmplexsans-400-ext.woff2?v=302a7106) format("woff2");unicode-range:U+0100-02FF}
@font-face{font-family:"Plex Sans";font-weight:600;font-display:swap;src:url(fonts/ibmplexsans-600-lat.woff2?v=302a7106) format("woff2");unicode-range:U+0000-00FF,U+2000-206F,U+2212}
@font-face{font-family:"Plex Sans";font-weight:600;font-display:swap;src:url(fonts/ibmplexsans-600-ext.woff2?v=302a7106) format("woff2");unicode-range:U+0100-02FF}
@font-face{font-family:"Plex Mono";font-weight:400;font-display:swap;src:url(fonts/ibmplexmono-400-lat.woff2?v=302a7106) format("woff2");unicode-range:U+0000-00FF,U+2000-206F,U+2212}
@font-face{font-family:"Plex Mono";font-weight:400;font-display:swap;src:url(fonts/ibmplexmono-400-ext.woff2?v=302a7106) format("woff2");unicode-range:U+0100-02FF}

:root{
  --bg:#f3efe6;--card:#fbf8f1;--ink:#1c1a16;--ink-2:#4a463d;--rule:#d8d1c1;--grid:#e2dccd;--link:#8f2a14;
  --curve:#b4321a;--glow:rgba(180,50,26,.14);--bar-bg:rgba(243,239,230,.92);
  --p0:#0b6b6b;--p1:#6a3fb0;--p2:#7f5200;--p3:#1d4fb8;
  color-scheme:light;
}
:root[data-theme="dark"]{--bg:#0d0f14;--card:#151821;--ink:#ece8df;--ink-2:#bdb8ad;--rule:#2b303c;--grid:#1f2430;--link:#ffab8a;--curve:#ff8a5c;--glow:rgba(255,138,92,.16);--bar-bg:rgba(13,15,20,.9);--p0:#5fd4cf;--p1:#c3a1ff;--p2:#f2b84b;--p3:#8fb3ff;color-scheme:dark}
@media (prefers-color-scheme:dark){:root:not([data-theme="light"]){--bg:#0d0f14;--card:#151821;--ink:#ece8df;--ink-2:#bdb8ad;--rule:#2b303c;--grid:#1f2430;--link:#ffab8a;--curve:#ff8a5c;--glow:rgba(255,138,92,.16);--bar-bg:rgba(13,15,20,.9);--p0:#5fd4cf;--p1:#c3a1ff;--p2:#f2b84b;--p3:#8fb3ff;color-scheme:dark}}

*{box-sizing:border-box}
html{-webkit-text-size-adjust:100%}
body{margin:0;background:var(--bg);color:var(--ink);font:400 1.125rem/1.62 "Literata",Georgia,serif;overflow-x:hidden}
a{color:var(--link);text-underline-offset:.18em;text-decoration-thickness:1px}
:focus-visible{outline:3px solid var(--curve);outline-offset:3px;border-radius:4px}
b,strong{font-weight:640}
[hidden]{display:none!important}
html:not(.js) .js-only{display:none!important}
.nojs-note{display:none}
html:not(.js) .nojs-note{display:block}
.skip{position:absolute;left:-999px;top:0;background:var(--card);color:var(--ink);padding:.5rem .8rem;z-index:99}
.skip:focus{left:.5rem;top:.5rem}
section[id]{scroll-margin-top:3.5rem}

/* ---- top bar ---- */
.topbar{position:sticky;top:0;z-index:40;display:flex;align-items:center;gap:.9rem;height:2.75rem;padding:0 1rem;background:var(--bar-bg);backdrop-filter:blur(8px);-webkit-backdrop-filter:blur(8px);border-bottom:1px solid var(--rule);font:400 .9rem/1 "Plex Sans",system-ui,sans-serif}
.topbar a{color:var(--ink);text-decoration:none}
.topbar .home{font-weight:600;white-space:nowrap}
.topnav{display:flex;gap:1rem;overflow-x:auto;scrollbar-width:none;min-width:0;flex:0 1 auto}
.topnav::-webkit-scrollbar{display:none}
.topnav a{white-space:nowrap;color:var(--ink-2)}
.topnav a:hover,.topnav a[aria-current="true"]{color:var(--ink);text-decoration:underline}
.spacer{flex:1 1 0}
.chip{position:relative;border:1px solid var(--ink-2);border-radius:99px;padding:.25rem .7rem;font-size:.82rem;white-space:nowrap}
.chip::after{content:"";position:absolute;left:-4px;right:-4px;top:50%;height:44px;transform:translateY(-50%)}
.icon-btn{display:inline-grid;place-items:center;width:2.75rem;height:2.75rem;margin-right:-.6rem;background:none;border:0;color:var(--ink);cursor:pointer;border-radius:50%}
.icon-btn svg[hidden]{display:none}
@media (max-width:760px){.topnav{display:none}.topbar{gap:.6rem}}

/* ---- rail ---- */
.rail{position:fixed;right:.9rem;top:50%;transform:translateY(-50%);z-index:30;display:flex;flex-direction:column;gap:.55rem;font-family:"Plex Sans",system-ui,sans-serif}
.rail a{display:flex;align-items:center;justify-content:flex-end;gap:.5rem;text-decoration:none;color:var(--ink-2);font-size:.8rem;min-height:24px}
.rail a span{opacity:0;transform:translateX(6px);transition:opacity .2s,transform .2s;background:var(--card);border:1px solid var(--rule);color:var(--ink);padding:.1rem .5rem;border-radius:4px;white-space:nowrap}
.rail a:hover span,.rail a:focus-visible span{opacity:1;transform:none}
.rail i{width:8px;height:8px;border-radius:50%;border:1.5px solid var(--ink-2);flex:none;transition:background .2s,transform .2s}
.rail a[aria-current="true"] i{background:var(--curve);border-color:var(--curve);transform:scale(1.35)}
@media (max-width:1100px){.rail{display:none}}

/* ---- page ---- */
main{padding:0 1rem}
article{max-width:68rem;margin:0 auto}
.hero{padding:1.6rem 0 1rem}
h1{font-weight:600;font-size:clamp(1.9rem,4.6vw,3.4rem);line-height:1.08;letter-spacing:-.012em;margin:0 0 .9rem;max-width:22ch;text-wrap:balance}
.deck{font-size:clamp(1.08rem,1.7vw,1.3rem);color:var(--ink-2);max-width:40rem;margin:0 0 1.2rem}
.block{max-width:40rem;margin:0 auto;padding:2.6rem 0 1rem;border-top:1px solid var(--rule)}
h2{font-size:clamp(1.45rem,2.6vw,1.95rem);line-height:1.18;margin:0 0 1rem;font-weight:600;text-wrap:balance}
h2 .anchor{color:inherit;text-decoration:none}
h2 .anchor:hover{text-decoration:underline}
p{margin:0 0 1rem}
.aside{font-size:.98rem;color:var(--ink-2);border-left:3px solid var(--rule);padding-left:.9rem}
.end{font-size:1.25rem;line-height:1.5;margin-top:2rem;padding-top:1.4rem;border-top:1px solid var(--rule)}

/* ---- family ---- */
.fam{border:0;padding:.6rem .8rem 0;margin:0;display:flex;flex-wrap:wrap;gap:.6rem 1rem;font-family:"Plex Sans",system-ui,sans-serif}
.fam legend{font-weight:600;font-size:.95rem;margin-bottom:.4rem;padding:0}
.p{display:flex;flex-direction:column;gap:.2rem;font-size:.85rem;color:var(--ink-2)}
.p input{font:600 1.35rem/1 "Plex Mono",ui-monospace,monospace;width:6.2ch;min-height:2.9rem;padding:.35rem .5rem;border:2px solid var(--rule);border-radius:8px;background:var(--card);color:var(--ink)}
.p input:focus{outline:none;border-color:currentColor}
.p input[aria-invalid="true"]{border-color:var(--curve)}
.p0 input{border-bottom-color:var(--p0)}.p1 input{border-bottom-color:var(--p1)}.p2 input{border-bottom-color:var(--p2)}.p3 input{border-bottom-color:var(--p3)}
.p input{border-bottom-width:5px}
.hint{flex-basis:100%;font-size:.88rem;color:var(--ink-2);margin:.1rem 0 0}
.linkbtn{background:none;border:0;padding:.5rem 0;min-height:44px;font:inherit;color:var(--link);text-decoration:underline;cursor:pointer}

/* ---- chart ---- */
.chart{margin:.4rem 0 0;background:var(--card);border:1px solid var(--rule);border-radius:12px;padding:.6rem .4rem .8rem;box-shadow:0 1px 0 var(--rule)}
#svg{display:block;width:100%}
.grid{stroke:var(--grid);stroke-width:1}
.zero{stroke:var(--ink-2);stroke-width:1;stroke-dasharray:4 4}
.treaty{stroke:var(--ink-2);stroke-width:1.2;stroke-dasharray:2 3}
.now{stroke:var(--ink-2);stroke-width:1}
.curve{fill:none;stroke:var(--curve);stroke-width:2.6;stroke-linejoin:round;filter:drop-shadow(0 0 6px var(--glow))}
.tick{font:400 12px "Plex Mono",ui-monospace,monospace;fill:var(--ink-2)}
.tick.s{font-size:10px}
.note{font:400 12.5px "Plex Sans",system-ui,sans-serif;fill:var(--ink-2)}
.note.strong{fill:var(--curve);font-weight:600}
.plabel{font:600 14px "Plex Sans",system-ui,sans-serif;stroke:var(--card);stroke-width:5px;stroke-linejoin:round}
.dot{stroke:var(--card);stroke-width:2.5}
.drop{stroke-width:1.5;stroke-dasharray:1 3}
.dot.p0,.made.p0{fill:var(--p0)}.dot.p1,.made.p1{fill:var(--p1)}.dot.p2,.made.p2{fill:var(--p2)}.dot.p3,.made.p3{fill:var(--p3)}
.plabel.p0{fill:var(--p0)}.plabel.p1{fill:var(--p1)}.plabel.p2{fill:var(--p2)}.plabel.p3{fill:var(--p3)}
.drop.p0{stroke:var(--p0)}.drop.p1{stroke:var(--p1)}.drop.p2{stroke:var(--p2)}.drop.p3{stroke:var(--p3)}
#readout{font:400 1rem/1.5 "Plex Sans",system-ui,sans-serif;padding:.6rem .8rem 0;color:var(--ink)}
#readout span{display:block;margin-bottom:.25rem}
@media (min-width:900px){#readout{font-size:1.08rem}.plabel{font-size:16px}.tick{font-size:13px}.note{font-size:14px}}

/* ---- body parts ---- */
.whose{display:flex;flex-wrap:wrap;align-items:center;gap:.4rem .5rem;margin:.4rem 0 1rem;font:400 .92rem "Plex Sans",system-ui,sans-serif;color:var(--ink-2)}
.who{min-height:44px;padding:.35rem .8rem;border-radius:99px;border:2px solid var(--rule);background:var(--card);color:var(--ink);font:600 .92rem "Plex Sans",system-ui,sans-serif;cursor:pointer}
.who[aria-pressed="true"].p0{border-color:var(--p0)}.who[aria-pressed="true"].p1{border-color:var(--p1)}.who[aria-pressed="true"].p2{border-color:var(--p2)}.who[aria-pressed="true"].p3{border-color:var(--p3)}
.who[aria-pressed="true"]{box-shadow:inset 0 0 0 1px currentColor}
.tissues{list-style:none;padding:0;margin:0 0 1.4rem}
.tis{padding:.8rem 0;border-bottom:1px solid var(--rule);display:grid;grid-template-columns:1fr auto;gap:.1rem .8rem}
.tn{font:600 1rem "Plex Sans",system-ui,sans-serif}
.tv{font:600 1.1rem "Plex Sans",system-ui,sans-serif;font-variant-numeric:tabular-nums;color:var(--curve);text-align:right}
.tis .strip{grid-column:1/-1;display:block;margin:.3rem 0 .2rem}
.td{grid-column:1/-1;font-size:.97rem;color:var(--ink-2)}
.ghost{fill:none;stroke:var(--curve);stroke-width:1.6;opacity:.6}
.hip{font:600 1rem "Plex Sans",system-ui,sans-serif;font-variant-numeric:tabular-nums;color:var(--ink)}
.qs{padding-left:1.3rem}
.qs li{margin-bottom:.8rem}

/* ---- sources, footer ---- */
.method{font-size:.97rem;color:var(--ink-2)}
.srcs{font-size:.88rem;color:var(--ink-2);padding-left:1.1rem}
.srcs li{margin-bottom:.35rem;overflow-wrap:anywhere}
.foot{max-width:40rem;margin:3rem auto 0;padding:1.5rem 1rem 3rem;border-top:1px solid var(--rule);font:400 .9rem "Plex Sans",system-ui,sans-serif;color:var(--ink-2)}
.nf main{max-width:40rem;margin:4rem auto;padding:0 1rem}
@media (prefers-reduced-motion:reduce){*{transition:none!important;scroll-behavior:auto!important}}
.axis{margin:.1rem .6rem .2rem;font:400 .85rem "Plex Sans",system-ui,sans-serif;color:var(--ink-2)}
.sr{position:absolute;width:1px;height:1px;overflow:hidden;clip:rect(0 0 0 0);white-space:nowrap}
.share{max-width:40rem;margin:1.4rem auto 0;display:flex;flex-wrap:wrap;gap:.5rem;align-items:center;font:600 .9rem "Plex Sans",system-ui,sans-serif;scroll-margin-top:4.75rem}
.sbtn{display:inline-flex;align-items:center;min-height:44px;padding:0 1rem;border:1.5px solid var(--rule);border-radius:99px;background:var(--card);color:var(--ink);text-decoration:none;font:inherit;cursor:pointer}
.sbtn:hover{border-color:var(--ink-2)}
.sr-status{color:var(--ink-2);font-weight:400}
.totop{position:fixed;right:1rem;bottom:1rem;z-index:35;display:grid;place-items:center;width:44px;height:44px;border-radius:50%;background:var(--card);border:1px solid var(--rule);color:var(--ink);text-decoration:none;font:600 1.1rem "Plex Sans",system-ui,sans-serif;box-shadow:0 2px 8px rgba(0,0,0,.15)}
@media (min-width:1101px){.totop{display:none}}
html:not(.js) #chart{display:none}
@media (min-width:1000px){.hero-head{display:grid;grid-template-columns:minmax(0,1.05fr) minmax(0,1fr);gap:2.6rem;align-items:end;margin-bottom:1.2rem}.hero-head h1{margin:0;max-width:none}.hero-head .deck{margin:0;font-size:1.05rem;line-height:1.55}}