:root{--background:#eef0f3;--surface:#fff;--surface-muted:#f3f5f8;--text:#1c2433;--muted-text:#5b6472;--border:#e2e6ec;--hair:#edf0f4;--accent:#0b7892;--accent-dark:#095f74;--wash:#e9f5f7;--warm:#df8000;--map-fill:#cfd5dd;--map-stroke:#fff;--shadow:0 10px 30px rgb(28 36 51 / 8%);--radius:.75rem;--serif:"Iowan Old Style","Palatino Linotype",Palatino,Georgia,"Times New Roman",serif;--sans:Inter,ui-sans-serif,system-ui,-apple-system,BlinkMacSystemFont,"Segoe UI",sans-serif;--mono:ui-monospace,SFMono-Regular,Menlo,Consolas,monospace;--uic:#0b7892;--added:#df8000;--blue:#256abf;--orange:#c9622a}
@media (prefers-color-scheme:dark){:root:not([data-theme="light"]){--background:#17181c;--surface:#1e2025;--surface-muted:#262930;--text:#f3f2f7;--muted-text:#a3a7b3;--border:#33363f;--hair:#2b2e36;--accent:#a78bfa;--accent-dark:#c4b5fd;--wash:#2e1f4d;--warm:#fb923c;--map-fill:#3a3d46;--map-stroke:#9ea3b2;--shadow:0 16px 40px rgb(0 0 0 / 45%);--uic:#a78bfa;--added:#fb923c;--blue:#86b6ef;--orange:#f2a476}}
:root[data-theme="dark"]{--background:#17181c;--surface:#1e2025;--surface-muted:#262930;--text:#f3f2f7;--muted-text:#a3a7b3;--border:#33363f;--hair:#2b2e36;--accent:#a78bfa;--accent-dark:#c4b5fd;--wash:#2e1f4d;--warm:#fb923c;--map-fill:#3a3d46;--map-stroke:#9ea3b2;--shadow:0 16px 40px rgb(0 0 0 / 45%);--uic:#a78bfa;--added:#fb923c;--blue:#86b6ef;--orange:#f2a476}
*{box-sizing:border-box}html{scroll-behavior:auto}
body{margin:0;background:var(--background);color:var(--text);font:16px/1.55 var(--sans);-webkit-font-smoothing:antialiased}
a{color:var(--accent)}a:hover{color:var(--accent-dark)}
.gn{position:sticky;top:0;z-index:1100;background:var(--surface);border-bottom:1px solid var(--border)}
.gn-inner{max-width:1180px;margin:0 auto;display:flex;align-items:center;gap:1.5rem;padding:10px 20px}
.gn-home{color:var(--muted-text);text-decoration:none;font:600 13px/1 var(--sans);letter-spacing:.02em;white-space:nowrap}.gn-home:hover{color:var(--text)}.gn-sep{color:var(--border);margin:0 10px}
.gn-brand{display:inline-flex;align-items:center;gap:8px;color:var(--text);text-decoration:none;font:600 17px/1 var(--sans);letter-spacing:-.02em}
.gn-brand span{color:var(--muted-text);font-weight:400;margin-left:.3em}
.gn-links{display:flex;gap:1.5rem;margin-left:auto;font-size:14px}.gn-links a{color:var(--text);text-decoration:none;opacity:.8}.gn-links a:hover{opacity:1}
.gn-cta{background:var(--accent);color:#fff!important;padding:7px 12px;border-radius:999px;opacity:1!important;font-weight:600}
.kicker{color:var(--muted-text);font-size:.72rem;font-weight:700;letter-spacing:.16em;text-transform:uppercase;margin:0 0 .5rem}
.wrap{max-width:1180px;margin:0 auto;padding:0 20px}
.story{display:grid;grid-template-columns:minmax(0,34rem) minmax(0,1fr);gap:40px;align-items:start}
.steps{padding:12vh 0 20vh}
.step{min-height:70vh;display:flex;align-items:center;padding:6vh 0}
.step:first-child{min-height:85vh}
.card{background:var(--surface);border:1px solid var(--border);border-radius:var(--radius);box-shadow:var(--shadow);padding:26px 28px 28px;max-width:34rem;transition:opacity .25s;opacity:.55}
.step.is-active .card{opacity:1}
.card h2{font-family:var(--serif);font-weight:600;font-size:1.75rem;line-height:1.12;letter-spacing:-.01em;margin:0 0 12px}
.card h1{font-family:var(--serif);font-weight:600;font-size:clamp(2.3rem,5vw,3.4rem);line-height:1.05;letter-spacing:-.01em;margin:0 0 16px}
.card p{margin:0 0 10px;color:var(--text)}.card p.dek{font-family:var(--serif);font-size:1.15rem;line-height:1.45}.card p.aside,.card .aside{font-size:13.5px;color:var(--muted-text)}
.card .cue{font-family:var(--mono);font-size:11px;letter-spacing:.12em;text-transform:uppercase;color:var(--muted-text);margin-top:18px}
.b{display:inline-block;font:700 10px/1.7 var(--sans);letter-spacing:.08em;text-transform:uppercase;border-radius:3px;padding:0 6px;vertical-align:middle;margin-right:6px}
.b-uic{background:color-mix(in srgb,var(--uic) 14%,transparent);color:var(--uic);border:1px solid color-mix(in srgb,var(--uic) 40%,transparent)}
.b-add{background:color-mix(in srgb,var(--added) 14%,transparent);color:var(--added);border:1px solid color-mix(in srgb,var(--added) 45%,transparent)}
.f{display:block;font:12px/1.5 var(--mono);color:var(--muted-text);background:var(--surface-muted);border-radius:6px;padding:8px 10px;margin:10px 0;white-space:pre-wrap}
.num{font-family:var(--mono);font-variant-numeric:tabular-nums}
.part-head{padding:12vh 0 0}.part-head .card{background:transparent;border:0;box-shadow:none;opacity:1;max-width:40rem}
.part-head h2{font-size:2.2rem}
.graphic{position:sticky;top:64px;height:calc(100vh - 64px);min-height:520px}
.graphic .panel{position:absolute;inset:16px 0 16px 0;border-radius:var(--radius);overflow:hidden;background:var(--surface);border:1px solid var(--border);box-shadow:var(--shadow)}
#map{position:absolute;inset:0;background:var(--background);transition:opacity .4s}
#chart{position:absolute;inset:0;padding:28px 30px;overflow:auto;background:var(--surface);transition:opacity .4s;opacity:0;pointer-events:none}
.graphic.chart #chart{opacity:1;pointer-events:auto}.graphic.chart #map{opacity:0}
.hud{position:absolute;left:14px;top:14px;z-index:800;width:280px;background:color-mix(in srgb,var(--surface) 92%,transparent);border:1px solid var(--border);border-radius:8px;padding:12px 14px;font-size:13px;color:var(--muted-text);backdrop-filter:blur(8px);pointer-events:none}
.hud .big{font-family:var(--serif);font-size:34px;line-height:1.05;color:var(--text);font-variant-numeric:tabular-nums;margin:2px 0 4px}.hud .lbl{font-size:11px;letter-spacing:.12em;text-transform:uppercase;color:var(--muted-text)}
.hud .row{display:flex;justify-content:space-between;gap:10px;font-family:var(--mono);font-size:12px;padding:2px 0}.hud .row .v{color:var(--text)}
.legend{position:absolute;right:14px;bottom:14px;z-index:800;background:color-mix(in srgb,var(--surface) 92%,transparent);border:1px solid var(--border);border-radius:8px;padding:8px 10px;font-size:11px;color:var(--muted-text)}.legend .sw{display:inline-block;width:14px;height:10px;margin-right:6px;vertical-align:-1px;border-radius:2px}
#chart h3{font-family:var(--serif);font-weight:600;font-size:1.25rem;margin:0 0 4px;color:var(--text)}#chart .sub{font-size:13px;color:var(--muted-text);margin:0 0 16px}
.bars{display:grid;grid-template-columns:11em 1fr 4.5em;gap:6px 10px;align-items:center;font-size:13px}.bars .name{color:var(--muted-text);white-space:nowrap;overflow:hidden;text-overflow:ellipsis}.bars .bar{height:14px;border-radius:3px;background:var(--map-fill);position:relative}.bars .bar i{position:absolute;top:0;bottom:0;border-radius:3px}.bars .val{text-align:right;font-family:var(--mono);font-variant-numeric:tabular-nums;color:var(--text)}
.bars.neg .bar{background:transparent;border-left:1px solid var(--border)}
.chart-svg{width:100%;height:auto;display:block}
.bignums{display:grid;grid-template-columns:1fr 1fr;gap:14px;margin:8px 0 18px}.bignums div{background:var(--surface-muted);border-radius:8px;padding:12px 14px}.bignums b{display:block;font-family:var(--serif);font-size:30px;line-height:1.05;color:var(--text)}.bignums span{font-size:12px;color:var(--muted-text)}
.cap{font-size:12px;color:var(--muted-text);margin-top:12px}
table.t{width:100%;border-collapse:collapse;font-size:12.5px}.t th,.t td{padding:5px 6px;border-bottom:1px solid var(--hair);text-align:left}.t td.n,.t th.n{text-align:right;font-family:var(--mono);font-variant-numeric:tabular-nums}
form .row{display:flex;gap:10px;align-items:center;margin:8px 0}form label{flex:0 0 9.5em;color:var(--muted-text);font-size:13px}form input,form select{flex:1;font:inherit;color:var(--text);background:var(--surface-muted);border:1px solid var(--border);border-radius:8px;padding:8px 10px;min-width:0}.btn{font:600 14px var(--sans);background:var(--accent);color:#fff;border:0;border-radius:999px;padding:9px 16px;cursor:pointer}#c-out{margin-top:14px}#c-out .est{font-family:var(--serif);font-size:2rem;line-height:1.1;color:var(--text);margin:6px 0 2px}#c-out .range{font-size:13px;color:var(--muted-text)}#c-out .err{color:var(--warm)}#c-out table{margin-top:10px}
.seg.reading{display:flex;flex-wrap:wrap;align-items:center;gap:6px;margin:4px 0 12px;font-size:12.5px;color:var(--muted-text)}.seg.reading button{font:600 12.5px var(--sans);color:var(--text);background:var(--surface-muted);border:1px solid var(--border);border-radius:999px;padding:4px 10px;cursor:pointer}.seg.reading button[aria-pressed="true"]{background:var(--accent);border-color:var(--accent);color:#fff}
details.math{margin-top:12px;border:1px solid var(--border);border-radius:8px;padding:8px 12px;background:var(--surface-muted)}details.math summary{cursor:pointer;font-weight:600;font-size:13.5px}details.math ol{margin:8px 0 6px 18px;padding:0;font-size:13px}details.math li{margin:6px 0}details.math .f{margin:4px 0}
.deck{position:fixed;left:50%;transform:translateX(-50%);bottom:16px;z-index:1200;display:flex;align-items:center;gap:6px;background:color-mix(in srgb,var(--surface) 92%,transparent);border:1px solid var(--border);border-radius:999px;padding:5px 6px;box-shadow:var(--shadow);backdrop-filter:blur(8px)}.deck button{font:600 15px var(--sans);width:34px;height:34px;border-radius:50%;border:0;background:var(--accent);color:#fff;cursor:pointer}.deck button:disabled{opacity:.35;cursor:default}.deck #deck-pos{font:12px var(--mono);color:var(--muted-text);min-width:118px;text-align:center}.deck #deck-pos b{color:var(--text);font-weight:600}
.ctas{display:flex;gap:10px;flex-wrap:wrap;margin-top:16px}.ctas a{display:inline-block;padding:9px 14px;border-radius:999px;text-decoration:none;font-weight:600;font-size:14px;border:1px solid var(--accent);color:var(--accent)}.ctas a.primary{background:var(--accent);color:#fff}
footer{border-top:1px solid var(--border);margin-top:40px;padding:24px 0 48px;font-size:13px;color:var(--muted-text)}
.leaflet-container{font:inherit}.leaflet-tooltip{font:12px var(--sans);color:var(--text);background:var(--surface);border:1px solid var(--border)}
@media (max-width:900px){.gn-home,.gn-sep{display:none}.story{grid-template-columns:1fr}.graphic{position:sticky;top:52px;height:46vh;min-height:300px;order:-1;z-index:5}.steps{padding-top:4vh}.step{min-height:auto;padding:4vh 0}.card{opacity:1}.hud{width:220px;font-size:12px}.hud .big{font-size:24px}.gn-links{gap:1rem}.gn-links a:not(.gn-cta){display:none}}

@media (max-width:900px){.deck{left:auto;right:10px;transform:none;bottom:10px;padding:4px}.deck button{width:30px;height:30px}.deck #deck-pos{min-width:0;padding:0 2px}.deck .deck-part{display:none}}
.card ol,.card ul{margin:0 0 10px;padding-left:20px}.card li{margin:0 0 6px}.card ul.refs{font-size:13px;color:var(--muted-text)}.card ul.refs li{margin:0 0 5px}.card table.t{margin:4px 0 10px}#chart .t td{vertical-align:top}#chart .t code{font-family:var(--mono);font-size:11.5px;overflow-wrap:anywhere}#chart .t{table-layout:auto}