@font-face{font-family:"Source Serif 4";src:url(fonts/source-serif-4-normal-latin.woff2) format("woff2");font-weight:200 900;font-style:normal;font-display:swap;unicode-range:U+0000-00FF,U+0131,U+0152-0153,U+02BB-02BC,U+02C6,U+02DA,U+02DC,U+2000-206F,U+20AC,U+2122,U+2191,U+2193,U+2212,U+2215}
@font-face{font-family:"Source Serif 4";src:url(fonts/source-serif-4-normal-latin-ext.woff2) format("woff2");font-weight:200 900;font-style:normal;font-display:swap;unicode-range:U+0100-024F,U+0259,U+1E00-1EFF,U+2020,U+20A0-20AB,U+20AD-20CF,U+2113,U+2C60-2C7F,U+A720-A7FF}
@font-face{font-family:"Source Serif 4";src:url(fonts/source-serif-4-italic-latin.woff2) format("woff2");font-weight:200 900;font-style:italic;font-display:swap;unicode-range:U+0000-00FF,U+2000-206F}
@font-face{font-family:"Source Serif 4";src:url(fonts/source-serif-4-italic-latin-ext.woff2) format("woff2");font-weight:200 900;font-style:italic;font-display:swap;unicode-range:U+0100-024F,U+1E00-1EFF}
@font-face{font-family:"IBM Plex Sans";src:url(fonts/IBMPlexSans-latin.woff2) format("woff2");font-weight:100 700;font-display:swap;unicode-range:U+0000-00FF,U+2000-206F,U+2212}
@font-face{font-family:"IBM Plex Sans";src:url(fonts/IBMPlexSans-latin-ext.woff2) format("woff2");font-weight:100 700;font-display:swap;unicode-range:U+0100-024F,U+1E00-1EFF}

:root{
  --bg:#f3efe6;--surface:#fbf8f1;--card:rgba(251,248,241,.95);--text:#1b1712;--muted:#4a4237;--rule:#d8cfbf;
  --red:#b3102a;--amber:#8a4600;--accent-ink:#8a3a00;--struck:#5d626d;--focus:#0b57b0;--badge-i:#b3102a;--badge-ink:#fff;
  --serif:"Source Serif 4",Georgia,"Times New Roman",serif;--sans:"IBM Plex Sans",system-ui,-apple-system,"Segoe UI",sans-serif;
  --top:48px;color-scheme:light
}
@media (prefers-color-scheme:dark){:root:not([data-theme="light"]){--bg:#0b1020;--surface:#121a2e;--card:rgba(15,22,40,.93);--text:#eef0f6;--muted:#bcc3d3;--rule:#28324b;--red:#ff6a70;--amber:#ffb347;--accent-ink:#ffbe6b;--struck:#aab2c5;--focus:#8ab8ff;--badge-i:#ff4a52;--badge-ink:#1a0306;color-scheme:dark}}
:root[data-theme="dark"]{--bg:#0b1020;--surface:#121a2e;--card:rgba(15,22,40,.93);--text:#eef0f6;--muted:#bcc3d3;--rule:#28324b;--red:#ff6a70;--amber:#ffb347;--accent-ink:#ffbe6b;--struck:#aab2c5;--focus:#8ab8ff;--badge-i:#ff4a52;--badge-ink:#1a0306;color-scheme:dark}

*{box-sizing:border-box}
[hidden]{display:none!important}
svg[hidden]{display:none}
html{-webkit-text-size-adjust:100%;scroll-padding-top:calc(var(--top) + 12px)}
body{margin:0;background:var(--bg);color:var(--text);font:400 18px/1.62 var(--serif);text-rendering:optimizeLegibility}
a{color:var(--accent-ink);text-underline-offset:2px}
:focus-visible{outline:2px solid var(--focus);outline-offset:2px}
strong{font-weight:650}
.skip-link{position:absolute;left:-999px;top:8px;background:var(--surface);color:var(--text);padding:8px 12px;z-index:50}.skip-link:focus{left:8px}

/* top bar: slim, takes the scene's colour */
.topbar{position:sticky;top:0;z-index:30;height:var(--top);display:flex;align-items:center;gap:10px;padding:0 14px;padding-top:var(--browser-safe-top,env(safe-area-inset-top));height:calc(var(--top) + var(--browser-safe-top,env(safe-area-inset-top)));padding-left:max(14px,env(safe-area-inset-left));padding-right:max(14px,env(safe-area-inset-right));background:var(--bg);border-bottom:1px solid color-mix(in srgb,var(--rule) 60%,transparent);font:500 14px/1 var(--sans)}
.brand{display:flex;align-items:center;gap:8px;color:var(--text);text-decoration:none;font-weight:600;white-space:nowrap}
.brand-mark{width:12px;height:12px;border-radius:50%;background:var(--red);box-shadow:0 0 0 3px color-mix(in srgb,var(--amber) 45%,transparent)}
.topnav{display:flex;gap:14px;margin-left:12px;overflow-x:auto;scrollbar-width:none}.topnav a{color:var(--muted);text-decoration:none;white-space:nowrap}.topnav a[aria-current="true"]{color:var(--text)}
.spacer{flex:1}
.chip{color:var(--muted);text-decoration:none;padding:6px 7px;border-radius:6px}.chip[aria-current="page"]{color:var(--text);background:var(--surface)}
.icon-btn{border:1px solid var(--rule);background:transparent;color:var(--text);border-radius:8px;width:36px;height:36px;display:grid;place-items:center;cursor:pointer}
:root[data-theme="dark"] .i-moon,:root:not([data-theme]) .i-moon{display:none}
:root[data-theme="light"] .i-sun{display:none}
@media (prefers-color-scheme:light){:root:not([data-theme]) .i-moon{display:inline}:root:not([data-theme]) .i-sun{display:none}}
@media (max-width:760px){.topnav{display:none}}

/* rail: hairline dots, out of the layout */
.rail{position:fixed;right:6px;top:50%;transform:translateY(-50%);z-index:20;display:flex;flex-direction:column;gap:1px;opacity:0;pointer-events:none;transition:opacity .3s}
.rail.on{opacity:1;pointer-events:auto}
.rail-dot{position:relative;display:block;width:16px;height:16px;text-decoration:none;color:var(--muted);font:500 12px/1 var(--sans)}
.rail-label{position:absolute;right:20px;top:50%;transform:translateY(-50%);white-space:nowrap;background:var(--surface);padding:3px 6px;border-radius:4px;opacity:0;pointer-events:none}
.rail-dot:hover .rail-label,.rail-dot:focus-visible .rail-label{opacity:1}
.dot{position:absolute;left:5px;top:5px;width:6px;height:6px;border-radius:50%;background:var(--rule)}.rail-dot[aria-current="true"] .dot{background:var(--red)}
@media (max-width:1180px){.rail{display:none}}

/* story */
.story{position:relative;display:grid;grid-template-columns:minmax(340px,450px) 1fr}
.stage{position:sticky;top:var(--top);height:calc(100vh - var(--top));height:calc(100svh - var(--top));grid-column:2;grid-row:1;overflow:hidden;background:var(--bg)}
.stage canvas,.stagebox canvas{display:block;width:100%;height:100%}
.stage canvas{touch-action:pan-y}
.stagebox canvas{touch-action:none}
.steps{grid-column:1;grid-row:1;position:relative;z-index:2;padding:0 0 30vh}
.hero{min-height:calc(100svh - var(--top));display:flex;flex-direction:column;justify-content:center;padding:40px 26px 40px 32px}
.kicker{font:600 13px/1.3 var(--sans);letter-spacing:.06em;text-transform:uppercase;color:var(--accent-ink);margin:0 0 12px}
h1{font:700 clamp(32px,3.8vw,48px)/1.08 var(--serif);letter-spacing:-.01em;margin:0 0 18px}
.deck{font-size:19px;margin:0 0 20px}
.deck strong{color:var(--accent-ink)}
.hero-actions{display:flex;align-items:center;gap:14px;flex-wrap:wrap}
.scroll-cue{font:500 14px var(--sans);color:var(--muted)}
.deck-src{font:500 14px var(--sans);margin:18px 0 0}
.btn{display:inline-flex;align-items:center;justify-content:center;gap:6px;border:1px solid var(--rule);background:var(--surface);color:var(--text);font:600 15px/1 var(--sans);padding:11px 16px;border-radius:9px;cursor:pointer;text-decoration:none;min-height:44px}
.btn.primary{background:var(--red);border-color:var(--red);color:#fff}
:root[data-theme="dark"] .btn.primary{color:#1a0306}
@media (prefers-color-scheme:dark){:root:not([data-theme="light"]) .btn.primary{color:#1a0306}}
.btn.small{font-size:14px;padding:8px 12px;min-height:40px}
.step{min-height:92vh;display:flex;align-items:center;padding:6vh 20px 6vh 28px}
.card{background:var(--card);border:1px solid var(--rule);border-radius:12px;padding:20px 22px 8px;box-shadow:0 8px 30px rgba(0,0,0,.1)}
.card h2,.block h2,.ex-head h2{font:700 25px/1.2 var(--serif);margin:0 0 12px}
.card p{margin:0 0 14px}
.anchor{margin-left:8px;font:500 16px var(--sans);color:var(--muted);text-decoration:none;opacity:0}
h2:hover .anchor,.anchor:focus-visible{opacity:1}
.legend{position:absolute;left:12px;bottom:12px;display:flex;flex-direction:column;gap:4px;background:var(--card);border:1px solid var(--rule);border-radius:8px;padding:7px 10px;font:500 12px/1.25 var(--sans);color:var(--muted)}
.legend span{display:flex;align-items:center;gap:7px}
.lg{display:inline-block;width:12px;height:12px;border-radius:50%;flex:none}
.lg.lg-dot{background:var(--red);transform:scale(.7)}
.lg.glow{background:radial-gradient(circle,color-mix(in srgb,var(--amber) 70%,transparent),transparent 70%)}
.lg.key{border:2px solid var(--amber);background:radial-gradient(circle,var(--red) 0 35%,transparent 38%)}
.lg.struck{border:1.5px solid var(--struck);transform:scale(.6)}
.map-fail{position:absolute;inset:auto 12px 50% 12px;text-align:center;font:500 15px var(--sans);color:var(--muted)}

@media (max-width:860px){
  .story{display:block}
  .stage{position:sticky;top:var(--top);height:40vh;height:40svh;z-index:5;border-bottom:1px solid var(--rule)}
  .steps{padding-bottom:8vh;z-index:1}
  .step,.hero{scroll-margin-top:calc(var(--top) + 40svh)}
  .hero{min-height:auto;padding:22px 18px 30px}
  h1{font-size:30px}
  .deck{font-size:17.5px}
  .step{min-height:auto;padding:16px 14px 48px}
  .card{box-shadow:none;padding:16px 16px 4px}
  .legend{left:6px;bottom:6px;padding:4px 7px;font-size:11px;gap:2px}
  body{font-size:17.5px}
}

/* after the story */
.after{position:relative;z-index:6;background:var(--bg);border-top:1px solid var(--rule)}
.explorer{max-width:1280px;margin:0 auto;padding:46px 20px 30px;scroll-margin-top:var(--top)}
.ex-head{max-width:760px}
.ex-head h2{font-size:30px}
.ex-grid{display:grid;grid-template-columns:minmax(300px,390px) 1fr;gap:22px;margin-top:16px;align-items:start}
.ex-view{position:sticky;top:calc(var(--top) + 10px)}
.stagebox{position:relative;height:min(72vh,700px);border:1px solid var(--rule);border-radius:12px;overflow:hidden;background:var(--bg)}
.map-ctl{position:absolute;right:10px;top:10px;display:flex;flex-direction:column;gap:6px}
.map-ctl button{width:44px;height:44px;border-radius:8px;border:1px solid var(--rule);background:var(--card);color:var(--text);font:600 20px/1 var(--sans);cursor:pointer}
.map-reset{position:absolute;right:62px;top:10px}
.help{font:500 13.5px/1.4 var(--sans);color:var(--muted);margin:8px 0 0}
.tip{position:absolute;z-index:4;pointer-events:none;max-width:240px;background:var(--surface);border:1px solid var(--rule);border-radius:8px;padding:6px 9px;font:500 13px/1.35 var(--sans)}
.pop{position:absolute;z-index:5;width:240px;background:var(--surface);border:1px solid var(--rule);border-radius:10px;padding:10px 12px;font:500 14px/1.4 var(--sans);box-shadow:0 8px 24px rgba(0,0,0,.2)}
.pop p{margin:0 0 4px}
.linkish{background:none;border:0;padding:0;color:var(--accent-ink);font:inherit;cursor:pointer;text-decoration:underline;text-underline-offset:2px;text-align:left;min-height:24px}
.pick{display:flex;gap:8px;align-items:flex-end}
.field{flex:1;display:flex;flex-direction:column;gap:5px;font:600 14px var(--sans)}
.field input{font:500 17px var(--sans);padding:10px 12px;border:1px solid var(--rule);border-radius:9px;background:var(--surface);color:var(--text);min-height:44px;width:100%}
.sugg{list-style:none;margin:4px 0 0;padding:0;border:1px solid var(--rule);border-radius:9px;background:var(--surface);font:500 15px/1.3 var(--sans);overflow:hidden}
.sugg li{padding:10px 12px;cursor:pointer;border-bottom:1px solid var(--rule)}.sugg li:last-child{border-bottom:0}
.sugg li[aria-selected="true"],.sugg li:hover{background:var(--bg)}
.sugg span{color:var(--muted);font-size:13.5px}
.examples{font:500 14px var(--sans);color:var(--muted);display:flex;flex-wrap:wrap;gap:6px;align-items:center;margin:12px 0}
.examples button{font:600 13.5px var(--sans);border:1px solid var(--rule);background:transparent;color:var(--text);border-radius:999px;padding:7px 12px;cursor:pointer;min-height:36px}
.shared{font:600 14px var(--sans);color:var(--accent-ink)}
.result{border-top:1px solid var(--rule);padding-top:14px}
.res-empty{color:var(--muted);font-style:italic}
.result h3{font:700 24px/1.2 var(--serif);margin:0}
.res-sub{font:500 14px var(--sans);color:var(--muted);margin:3px 0 10px}
.badge{display:inline-block;font:600 14px/1.3 var(--sans);padding:5px 10px;border-radius:6px;border:1px solid var(--rule);margin:0 0 10px}
.badge[data-c="I"]{background:var(--badge-i);color:var(--badge-ink);border-color:var(--badge-i)}
.badge:empty{display:none}
.ans{margin:0 0 10px}.ans:empty{display:none}.ans.muted{color:var(--muted);font-size:16.5px}
.res-actions{display:flex;gap:8px;flex-wrap:wrap;margin-top:4px}
@media (max-width:860px){.ex-grid{grid-template-columns:1fr}.ex-view{position:relative;top:0}.stagebox{height:56vh;height:56svh}.explorer{padding:30px 14px}}

.prose{max-width:760px;margin:0 auto;padding:10px 20px 40px}
.block{margin:44px 0;scroll-margin-top:calc(var(--top) + 8px)}
.block p{margin:0 0 14px}
.block h3{font:700 19px/1.3 var(--serif);margin:26px 0 8px}
blockquote{margin:0 0 16px;padding:12px 18px;border-left:3px solid var(--red);background:var(--surface);border-radius:0 8px 8px 0;font-style:italic}
.fig{margin:10px 0 18px}.fig-h{font:600 15px var(--sans);margin:0 0 8px}
.tablewrap{overflow-x:auto;border:1px solid var(--rule);border-radius:10px}
table.pub{border-collapse:collapse;width:100%;font:500 14px/1.4 var(--sans)}
table.pub th,table.pub td{padding:9px 10px;border-bottom:1px solid var(--rule);text-align:left;vertical-align:top}
table.pub th{font-weight:600;background:var(--surface)}
table.pub .n{text-align:right;font-variant-numeric:tabular-nums}
table.pub th.n{white-space:nowrap}
table.pub .sub{color:var(--muted);font-size:12.5px}
.fig-note{font:500 13.5px/1.45 var(--sans);color:var(--muted);margin:8px 0 0}
svg.tl,svg.cmp{display:block;width:100%;height:auto;font-family:var(--sans)}
.tl .band{fill:var(--rule)}.tl .band.ban{fill:var(--red);opacity:.85}.tl .band.crowd{fill:color-mix(in srgb,var(--red) 30%,var(--rule))}
.tl .bl{font-size:12px;fill:var(--muted);font-weight:600}.tl .bl.ban{fill:var(--red)}
.tl .tick{stroke:var(--muted)}.tl .yr{font-size:12px;fill:var(--muted)}
.tl .snap{stroke:var(--text);stroke-dasharray:3 3;opacity:.7}.tl .sn{font-size:11.5px;fill:var(--text)}
.tl .pm{fill:var(--amber)}.tl .rq{fill:none;stroke:var(--struck);stroke-width:1.8}
.tl .lg{font-size:12.5px;fill:var(--text)}
.cmp .cl{font-size:14px;fill:var(--text)}.cmp .track{fill:var(--surface);stroke:var(--rule)}
.cmp .bar{fill:var(--struck)}.cmp .bar.I{fill:var(--red)}.cmp .cv{font-size:13.5px;fill:var(--text);font-weight:600}
ul.do{padding-left:20px}ul.do li{margin:0 0 10px}
.sources{font-size:15.5px;padding-left:20px}.sources li{margin:0 0 8px}
.related ul{padding-left:20px;font-size:16px}
.share{margin:22px 0}.share-row{display:flex;align-items:center;gap:8px;flex-wrap:wrap}
.share-label{font:600 14px var(--sans);margin-right:4px}
.ic{display:inline-grid;place-items:center;width:40px;height:40px;border-radius:50%;border:1px solid var(--rule);background:transparent;color:var(--text);cursor:pointer}
.ic:hover,.ic:focus-visible{color:var(--accent-ink);border-color:var(--accent-ink)}
@media (pointer:coarse){.ic{width:44px;height:44px}}
.share-msg{font:500 13px var(--sans);color:var(--muted);margin:6px 0 0;min-height:1em}
.site-footer{display:flex;gap:18px;justify-content:center;flex-wrap:wrap;padding:26px 16px 40px;font:500 14px var(--sans);color:var(--muted);border-top:1px solid var(--rule)}
.site-footer a{color:var(--muted)}
.place-page main{max-width:640px;margin:10vh auto;padding:0 20px}
@media (prefers-reduced-motion:reduce){*{scroll-behavior:auto!important;transition:none!important}}
@media print{.rail,.topbar,.stage,.share,.map-ctl{display:none}}