/* Source Serif 4 (700) + Source Sans 3 (400/600/700), OFL 1.1, Adobe. Self-hosted. */
@font-face{font-family:"Source Serif 4";font-style:normal;font-weight:700;font-display:swap;
  src:url("fonts/sourceserif4-700-latin.woff2") 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:"Source Serif 4";font-style:normal;font-weight:700;font-display:swap;
  src:url("fonts/sourceserif4-700-latin-ext.woff2") 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:"Source Sans 3";font-style:normal;font-weight:400;font-display:swap;
  src:url("fonts/sourcesans3-400-latin.woff2") 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:"Source Sans 3";font-style:normal;font-weight:400;font-display:swap;
  src:url("fonts/sourcesans3-400-latin-ext.woff2") 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:"Source Sans 3";font-style:normal;font-weight:600;font-display:swap;
  src:url("fonts/sourcesans3-600-latin.woff2") 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:"Source Sans 3";font-style:normal;font-weight:600;font-display:swap;
  src:url("fonts/sourcesans3-600-latin-ext.woff2") 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:"Source Sans 3";font-style:normal;font-weight:700;font-display:swap;
  src:url("fonts/sourcesans3-700-latin.woff2") 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:"Source Sans 3";font-style:normal;font-weight:700;font-display:swap;
  src:url("fonts/sourcesans3-700-latin-ext.woff2") 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}

:root{
  --paper:#ffffff; --ink:#1c1e1a; --muted:#4d554e; --line:#e3e0d3;
  --accent:#14532d; --accent-ink:#0e3d21; --gold:#9a5b00; --gold-soft:#f4e8d2;
  --card:#f6f4ec; --bar-track:#eceade; --shade:rgba(20,83,45,.12); --ghost:#8a8f84;
  --serif:"Source Serif 4",Georgia,"Times New Roman",serif;
  --sans:"Source Sans 3",system-ui,-apple-system,"Segoe UI",Roboto,Arial,sans-serif;
  --measure:40rem; --wide:66rem; --topbar-h:3rem;
}
html[data-theme="dark"]{
  --paper:#131511; --ink:#f0ede1; --muted:#a8ad9f; --line:#2c3027;
  --accent:#8fd0a4; --accent-ink:#c9ecd4; --gold:#e2a63d; --gold-soft:#2a2415;
  --card:#1b1e18; --bar-track:#24281f; --shade:rgba(143,208,164,.14); --ghost:#7d8274;
}
*{box-sizing:border-box}
html{scroll-behavior:smooth}
@media (prefers-reduced-motion:reduce){html{scroll-behavior:auto}*{transition:none!important;animation:none!important}}
body{margin:0;background:var(--paper);color:var(--ink);font-family:var(--sans);font-size:1.075rem;line-height:1.62}
section{scroll-margin-top:calc(var(--topbar-h) + .75rem)}
h1,h2,h3{font-family:var(--serif);font-weight:700;line-height:1.14;text-wrap:balance}
a{color:var(--accent);text-underline-offset:.12em}
:focus-visible{outline:2px solid var(--gold);outline-offset:2px;border-radius:2px}
.num,.val,.big,output{font-variant-numeric:tabular-nums lining-nums}

/* topbar — house pattern */
.topbar{position:sticky;top:0;z-index:50;height:var(--topbar-h);display:flex;align-items:center;gap:.9rem;
  padding:0 .9rem;background:var(--paper);border-bottom:1px solid var(--line);white-space:nowrap}
.topbar .home{font-family:var(--serif);font-weight:700;color:var(--ink);text-decoration:none;font-size:.98rem}
.topnav{display:flex;gap:.15rem;overflow-x:auto;scrollbar-width:none}
.topnav::-webkit-scrollbar{display:none}
.topnav a{color:var(--muted);text-decoration:none;font-size:.9rem;padding:.3rem .55rem;border-radius:.4rem;white-space:nowrap}
.topnav a:hover{color:var(--ink)}
.topnav a[aria-current="true"]{color:var(--ink);font-weight:700}
.spacer{flex:1 1 auto}
.chip{font-size:.85rem;color:var(--muted);text-decoration:none;border:1px solid var(--line);border-radius:999px;padding:.15rem .7rem}
.chip:hover{color:var(--ink);border-color:var(--muted)}
.icon-btn{display:inline-flex;align-items:center;justify-content:center;width:2rem;height:2rem;border-radius:50%;
  border:1px solid var(--line);background:transparent;color:var(--ink);cursor:pointer}
.icon-btn:hover{border-color:var(--muted)}
.icon-btn svg{display:block}
.icon-btn svg[hidden]{display:none}

/* reading rail */
.rail{display:none}
@media(min-width:76rem){
  .rail{display:flex;position:fixed;right:1.1rem;top:50%;transform:translateY(-50%);z-index:40;
    flex-direction:column;gap:.85rem;margin:0;padding:0;list-style:none}
  .rail a{position:relative;display:block;width:1.4rem;height:1.4rem;border-radius:50%}
  .rail a i{position:absolute;inset:.4rem;border-radius:50%;background:var(--muted);opacity:.55;display:block}
  .rail a[aria-current="true"] i{background:var(--accent);opacity:1;transform:scale(1.45)}
  .rail a span{position:absolute;right:1.7rem;top:50%;transform:translateY(-50%);white-space:nowrap;
    font-size:.8rem;color:var(--ink);background:var(--paper);border:1px solid var(--line);
    border-radius:.35rem;padding:.1rem .5rem;opacity:0;pointer-events:none}
  .rail a:hover span,.rail a:focus-visible span{opacity:1}
}
@media print{.rail,.topbar .topnav,.topbar .icon-btn,.copybtn{display:none}.topbar{position:static}}

/* hero */
.hero{max-width:var(--wide);margin:0 auto;padding:2.4rem 1.2rem 0}
.kicker{font-size:.85rem;letter-spacing:.02em;color:var(--muted);margin:0 0 .7rem;font-weight:600}
.kicker strong{color:var(--accent)}
h1.title{font-size:clamp(2.1rem,5.4vw,3.5rem);margin:0 0 .9rem;max-width:22ch}
.answer{font-family:var(--serif);font-size:clamp(1.25rem,2.8vw,1.7rem);line-height:1.4;
  border-top:2px solid var(--ink);border-bottom:1px solid var(--line);
  padding:.9rem 0;margin:0 0 1rem;max-width:44rem}
.answer strong{font-variant-numeric:tabular-nums}
.hero-grid{display:grid;gap:1rem;align-items:end;margin:0 0 1rem}
@media(min-width:52rem){.hero-grid{grid-template-columns:1fr minmax(16rem,24rem)}}
.hero-curve{margin:0}
.hero-curve svg{width:100%;height:auto;display:block}
.hero-curve svg path.draw{stroke-dasharray:1200;stroke-dashoffset:1200;animation:draw 1.6s ease-out .2s forwards}
.hero-curve .hc-t{stroke:var(--accent)}
.hero-curve .hc-c{stroke:var(--muted)}
@keyframes draw{to{stroke-dashoffset:0}}
.hero-sub{color:var(--muted);max-width:44rem;margin:0 0 .4rem}
.fresh{font-size:.88rem;color:var(--muted);max-width:44rem;margin:0}

/* sections */
.section{max-width:var(--wide);margin:0 auto;padding:2.4rem 1.2rem 0}
.prose{max-width:var(--measure)}
h2.st{font-size:clamp(1.55rem,3.4vw,2.15rem);margin:0 0 .4rem}
.lede{color:var(--muted);font-size:1.08rem;margin:.2rem 0 1.1rem;max-width:var(--measure)}
h3{font-size:1.22rem;margin:1.7rem 0 .4rem}

/* calculator */
.calc{display:grid;gap:1.4rem;margin-top:1rem}
@media(min-width:58rem){.calc{grid-template-columns:minmax(16rem,22rem) 1fr}}
.panel{border:1px solid var(--line);border-radius:.8rem;background:var(--card);padding:1.1rem 1.2rem}
.field{margin:0 0 1rem}
.field label{display:flex;justify-content:space-between;align-items:baseline;font-weight:600;font-size:.94rem;margin-bottom:.3rem;gap:.6rem}
.field output{font-variant-numeric:tabular-nums;color:var(--accent);font-weight:700;white-space:nowrap}
.field .hint{display:block;font-weight:400;color:var(--muted);font-size:.8rem}
input[type="range"]{width:100%;accent-color:var(--accent);min-height:2rem}
.toggle{border:1px solid var(--line);border-radius:.6rem;overflow:hidden;margin:0 0 1rem}
.toggle legend{font-weight:600;font-size:.94rem;padding:0 .4rem}
.toggle div{display:flex}
.toggle label{flex:1;text-align:center;font-size:.9rem;font-weight:600;padding:.5rem .2rem;cursor:pointer;color:var(--muted)}
.toggle input{position:absolute;opacity:0}
.toggle label:has(input:checked){background:var(--accent);color:#fff}
html[data-theme="dark"] .toggle label:has(input:checked){color:#131511}
.toggle label:has(input:focus-visible){outline:2px solid var(--gold);outline-offset:-2px}
.results{border-top:1px solid var(--line);margin-top:.4rem;padding-top:.9rem;display:grid;gap:.55rem}
.result .k{font-size:.82rem;color:var(--muted);font-weight:600;letter-spacing:.02em;text-transform:uppercase}
.result .big{font-family:var(--serif);font-size:2rem;font-variant-numeric:tabular-nums;display:block;line-height:1.2}
.result .sub{color:var(--muted);font-size:.9rem}
.copybtn{justify-self:start;font:inherit;font-size:.88rem;font-weight:600;color:var(--accent);
  background:transparent;border:1px solid var(--accent);border-radius:.5rem;padding:.45rem .9rem;cursor:pointer}
.copybtn:hover{background:var(--accent);color:#fff}
html[data-theme="dark"] .copybtn:hover{color:#131511}
.chart-wrap{position:relative;min-width:0}
.chart-wrap svg{width:100%;height:auto;display:block;touch-action:pan-y}
.chart-wrap svg:focus-visible{outline:2px solid var(--gold);border-radius:.4rem}
.legend{display:flex;gap:1.1rem;font-size:.86rem;color:var(--muted);margin:.5rem 0 0;flex-wrap:wrap}
.legend i{display:inline-block;width:1.3rem;height:0;border-top:3px solid var(--accent);margin-right:.35rem;vertical-align:.2em}
.legend .l-c{border-color:var(--muted)}
.legend .l-w{border-color:var(--ghost);border-top-style:dashed}
.legend .l-o{border-color:var(--gold);border-top-style:dashed}
.scrub-read{font-variant-numeric:tabular-nums;font-size:.9rem;color:var(--muted);min-height:1.4em;margin:.3rem 0 0}
.note{font-size:.88rem;color:var(--muted)}
table.data{border-collapse:collapse;width:100%;font-size:.94rem;margin:1rem 0}
table.data caption{text-align:left;font-weight:600;padding:.4rem 0}
table.data th,table.data td{border-bottom:1px solid var(--line);padding:.5rem .6rem;text-align:right;font-variant-numeric:tabular-nums}
table.data th:first-child,table.data td:first-child{text-align:left}
table.data thead th{font-size:.85rem;color:var(--muted);font-weight:600}

/* CEI-S vs CEI-D flow */
.flow2{display:grid;gap:1rem;margin:1rem 0}
@media(min-width:52rem){.flow2{grid-template-columns:1fr 1fr}}
.lane{border:1px solid var(--line);border-radius:.7rem;padding:1rem 1.1rem;background:var(--paper)}
.lane h3{margin:0 0 .2rem;font-size:1.3rem}
.lane h3 .tag{font-family:var(--sans);font-size:.76rem;font-weight:700;color:#fff;background:var(--accent);
  border-radius:999px;padding:.12rem .6rem;vertical-align:.15em;margin-left:.4rem}
html[data-theme="dark"] .lane h3 .tag{color:#131511}
.lane ol{list-style:none;margin:.8rem 0 0;padding:0;display:grid;gap:.35rem}
.lane li{display:flex;justify-content:space-between;gap:.6rem;border-bottom:1px dashed var(--line);padding:.4rem 0;font-size:.93rem}
.lane li:last-child{border-bottom:0}
.lane li b{font-variant-numeric:tabular-nums;white-space:nowrap}
.lane li.total{font-weight:700}
.lane li.total b{color:var(--accent);font-size:1.05rem}
.taxctl{display:grid;gap:.8rem;margin:1rem 0;max-width:var(--measure)}
@media(min-width:40rem){.taxctl{grid-template-columns:1fr 1fr}}

/* bars */
.bars{list-style:none;margin:1rem 0;padding:0;display:grid;gap:.7rem}
.bars li{display:grid;grid-template-columns:minmax(7rem,12rem) 1fr auto;gap:.7rem;align-items:center}
.bars .lbl{font-size:.92rem}
.bars .val{font-variant-numeric:tabular-nums;font-weight:700;white-space:nowrap}
.bar{height:1.35rem;background:var(--bar-track);border-radius:.25rem;position:relative;overflow:hidden}
.bar i{position:absolute;inset:0 auto 0 0;background:var(--accent);border-radius:.25rem}
.bar.gold i{background:var(--gold)}
.bar.unknown{background:repeating-linear-gradient(-45deg,transparent,transparent 5px,var(--gold-soft) 5px,var(--gold-soft) 10px);border:1px dashed var(--gold)}
.bar.plain{border:1px solid var(--line)}
.bar .dashline{position:absolute;inset:0 auto 0 0;border-right:3px dashed var(--gold);background:transparent}
.unknown-cell{background:repeating-linear-gradient(-45deg,transparent,transparent 6px,var(--gold-soft) 6px,var(--gold-soft) 12px);font-weight:600}

/* comparison table */
.compare-wrap{overflow-x:auto;margin:1rem 0}
table.compare{border-collapse:collapse;min-width:36rem;width:100%;font-size:.93rem}
table.compare caption{text-align:left;font-weight:600;padding:.4rem 0}
table.compare th,table.compare td{border:1px solid var(--line);padding:.5rem .65rem;text-align:left;vertical-align:top}
table.compare thead th{background:var(--card);font-family:var(--serif);font-size:1rem}
table.compare tbody th{font-weight:600}

/* minis + research pairs */
.minis{display:grid;gap:1rem;margin:1rem 0}
@media(min-width:52rem){.minis{grid-template-columns:repeat(3,1fr)}}
.mini{border-top:2px solid var(--ink);padding-top:.6rem}
.mini h3{font-size:1.05rem;margin:0 0 .3rem;font-family:var(--sans);font-weight:700}
.mini .bars li{grid-template-columns:minmax(4.5rem,6.5rem) 1fr auto}
.mini p{font-size:.87rem;color:var(--muted);margin:.4rem 0 0}
.pairs{display:grid;gap:1.2rem}
@media(min-width:52rem){.pairs{grid-template-columns:1fr 1fr}}
.pair h3{font-size:1.1rem;margin:0 0 .2rem;font-family:var(--sans);font-weight:700}
.bigfig{text-align:center;border-top:2px solid var(--ink);padding-top:.6rem}
.bigfig .n{font-family:var(--serif);font-size:3.2rem;font-variant-numeric:tabular-nums;display:block;line-height:1.1}
.bigfig .c{font-size:.9rem;color:var(--muted);margin:.3rem 0 0}

/* timeline */
.timeline{list-style:none;margin:1rem 0 0;padding:0 0 0 1.1rem;border-left:2px solid var(--line);display:grid;gap:.9rem}
.timeline li{position:relative;padding-left:.6rem}
.timeline li::before{content:"";position:absolute;left:-1.5rem;top:.45em;width:.6rem;height:.6rem;border-radius:50%;background:var(--paper);border:2px solid var(--accent)}
.timeline .yr{font-variant-numeric:tabular-nums;font-weight:700;color:var(--accent)}
.timeline p{margin:.15rem 0 0}
.timeline.tight{gap:.7rem}
.timeline.tight p{font-size:.95rem}

/* unknowns */
.unknowns{list-style:none;margin:1rem 0;padding:0;display:grid;gap:.7rem}
@media(min-width:52rem){.unknowns{grid-template-columns:1fr 1fr}}
.unknowns li{border:1px solid var(--line);border-radius:.6rem;padding:.85rem 1rem;background:var(--paper)}
.unknowns .status{display:inline-flex;align-items:center;gap:.4rem;font-size:.76rem;font-weight:700;
  letter-spacing:.03em;text-transform:uppercase;color:var(--gold);margin-bottom:.35rem}
.unknowns .status::before{content:"";width:.55rem;height:.55rem;border-radius:50%;border:2px solid var(--gold)}
.unknowns .status.known{color:var(--accent)}
.unknowns .status.known::before{background:var(--accent);border-color:var(--accent)}
.unknowns b{display:block;font-size:1.02rem}
.unknowns p{margin:.3rem 0 0;color:var(--muted);font-size:.92rem}

/* method + footer */
.method-list{margin:.6rem 0;padding-left:1.2rem}
.method-list li{margin:.4rem 0}
.sources{font-size:.92rem}
.sources li{margin:.35rem 0}
footer.site{max-width:var(--wide);margin:3rem auto 0;padding:1.4rem 1.2rem 2.4rem;border-top:1px solid var(--line);
  color:var(--muted);font-size:.86rem;display:flex;gap:1rem;flex-wrap:wrap;justify-content:space-between}
footer.site a{color:var(--muted)}
.skip{position:absolute;left:-999px;top:0;background:var(--accent);color:#fff;padding:.5rem 1rem;z-index:99}
.skip:focus{left:0;color:#fff}
.sr{position:absolute;width:1px;height:1px;overflow:hidden;clip:rect(0 0 0 0);white-space:nowrap}
#p-total{stroke:var(--accent)}
#p-contrib{stroke:var(--muted)}
#p-wait{stroke:var(--ghost);stroke-dasharray:6 4}
#p-out{stroke:var(--gold);stroke-dasharray:6 4}
#shade{fill:var(--shade)}
.svg-grid{stroke:var(--line)}
.svg-mut{fill:var(--muted)}
.svg-ink{fill:var(--ink)}
.endlabel{font-size:12.5px;font-weight:600}
#scrub-line{stroke:var(--gold);stroke-width:1.5}
#scrub-dot-t{fill:var(--accent)}
#scrub-dot-c{fill:var(--muted)}
@media(max-width:30rem){
  .bars li{grid-template-columns:1fr auto}
  .bars .bar{grid-column:1/-1;order:3}
  .result .big{font-size:1.7rem}
  .minis{grid-template-columns:1fr}
}