@font-face{font-family:"EB Garamond";font-style:normal;font-weight:400 800;font-display:swap;src:url("fonts/ebgaramond-latin.woff2") format("woff2");unicode-range:U+0000-00FF,U+0131,U+0152-0153,U+02BB-02BC,U+02C6,U+02DA,U+02DC,U+2000-206F,U+2074,U+20AC,U+2122,U+2190-2193,U+2212,U+2215,U+FEFF,U+FFFD}
@font-face{font-family:"EB Garamond";font-style:normal;font-weight:400 800;font-display:swap;src:url("fonts/ebgaramond-latin-ext.woff2") format("woff2");unicode-range:U+0100-02AF,U+0304,U+0308,U+0329,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:"EB Garamond";font-style:italic;font-weight:400 800;font-display:swap;src:url("fonts/ebgaramond-italic-latin.woff2") format("woff2");unicode-range:U+0000-00FF,U+0131,U+0152-0153,U+02BB-02BC,U+02C6,U+02DA,U+02DC,U+2000-206F,U+2074,U+20AC,U+2122,U+2190-2193,U+2212,U+2215,U+FEFF,U+FFFD}
@font-face{font-family:"EB Garamond";font-style:italic;font-weight:400 800;font-display:swap;src:url("fonts/ebgaramond-italic-latin-ext.woff2") format("woff2");unicode-range:U+0100-02AF,U+0304,U+0308,U+0329,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:"IBM Plex Sans";font-style:normal;font-weight:300 700;font-display:swap;src:url("fonts/IBMPlexSans-latin.woff2") format("woff2");unicode-range:U+0000-00FF,U+0131,U+0152-0153,U+02BB-02BC,U+02C6,U+02DA,U+02DC,U+2000-206F,U+2074,U+20AC,U+2122,U+2191,U+2193,U+2212,U+2215,U+FEFF,U+FFFD}
@font-face{font-family:"IBM Plex Sans";font-style:normal;font-weight:300 700;font-display:swap;src:url("fonts/IBMPlexSans-latin-ext.woff2") format("woff2");unicode-range:U+0100-02AF,U+0304,U+0308,U+0329,U+1E00-1E9F,U+1EF2-1EFF,U+2020,U+20A0-20AB,U+20AD-20C0,U+2113,U+2C60-2C7F,U+A720-A7FF}


/* The palette is a winter night over the valley: cold blue below, an ember band above. By day, snow. */
:root{
  color-scheme:light;
  --bg:#f3f5f8;--bg-2:#e8ecf2;--surface:#ffffff;--surface-2:#e6ebf2;
  --ink:#111827;--ink-2:#263043;--muted:#465064;--line:#bcc5d3;--line-soft:#d6dce6;
  --accent:#8a3a0a;--accent-2:#9c2a14;--accent-ink:#ffffff;--gold:#e2772f;
  --card:#ffffff;
  --s-dark:0;--s-near:#8794ab;--s-ridge:rgba(30,45,80,.5);--s-ink:#0d1424;--s-halo:rgba(255,255,255,.9);--s-line:rgba(20,30,60,.3);--s-none:#e1e6ee;--s-accent:#b3261e;
  --lg-warm:#e48a45;--lg-cold:#9fb2d2;
  --serif:"EB Garamond","Iowan Old Style",Georgia,serif;--sans:"IBM Plex Sans",system-ui,-apple-system,"Segoe UI",sans-serif;
  --topbar:50px;
}
@media (prefers-color-scheme:dark){:root:not([data-theme="light"]){
  color-scheme:dark;
  --bg:#0a0e18;--bg-2:#0f1422;--surface:#121829;--surface-2:#1b2439;
  --ink:#f1f4fa;--ink-2:#d5dbe8;--muted:#aab3c5;--line:#2f3a56;--line-soft:#212a40;
  --accent:#ffb866;--accent-2:#ff9b6b;--accent-ink:#1a1000;--gold:#f2a04a;
  --card:#121829;
  --s-dark:1;--s-near:#070a12;--s-ridge:rgba(190,210,255,.22);--s-ink:#ffffff;--s-halo:rgba(6,9,18,.88);--s-line:rgba(255,255,255,.24);--s-none:#161c2c;--s-accent:#ffd24a;
  --lg-warm:#f0a45c;--lg-cold:#46669f;
}}
:root[data-theme="dark"]{
  color-scheme:dark;
  --bg:#0a0e18;--bg-2:#0f1422;--surface:#121829;--surface-2:#1b2439;
  --ink:#f1f4fa;--ink-2:#d5dbe8;--muted:#aab3c5;--line:#2f3a56;--line-soft:#212a40;
  --accent:#ffb866;--accent-2:#ff9b6b;--accent-ink:#1a1000;--gold:#f2a04a;
  --card:#121829;
  --s-dark:1;--s-near:#070a12;--s-ridge:rgba(190,210,255,.22);--s-ink:#ffffff;--s-halo:rgba(6,9,18,.88);--s-line:rgba(255,255,255,.24);--s-none:#161c2c;--s-accent:#ffd24a;
  --lg-warm:#f0a45c;--lg-cold:#46669f;
}
*{box-sizing:border-box}
[hidden]{display:none!important}
svg[hidden]{display:none}
html{-webkit-text-size-adjust:100%;scroll-padding-top:calc(var(--topbar) + 14px)}
body{margin:0;background:var(--bg);color:var(--ink);font-family:var(--sans);font-size:17px;line-height:1.56;-webkit-font-smoothing:antialiased;overflow-x:clip}
a{color:inherit;text-decoration-color:var(--accent);text-underline-offset:.18em;text-decoration-thickness:1.5px}
a:hover{color:var(--accent)}
:focus-visible{outline:2.5px solid var(--accent);outline-offset:3px;border-radius:4px}
.skip-link{position:absolute;left:12px;top:-60px;z-index:100;background:var(--ink);color:var(--bg);padding:10px 14px;border-radius:8px;font-weight:600}
.skip-link:focus{top:10px}
.num{font-variant-numeric:tabular-nums lining-nums}
.sr-only{position:absolute;width:1px;height:1px;overflow:hidden;clip:rect(0 0 0 0);white-space:nowrap}
h1,h2,h3{font-family:var(--serif);font-weight:600;text-wrap:balance}
.anchor{opacity:0;margin-left:.3em;text-decoration:none;color:var(--muted);font-family:var(--sans);font-size:.6em;vertical-align:middle}
h2:hover .anchor,h3:hover .anchor,.anchor:focus-visible{opacity:1}

/* ---------- top bar */
.topbar{position:fixed;inset:0 0 auto 0;height:var(--topbar);z-index:40;display:flex;align-items:center;gap:6px;padding:0 max(14px,env(safe-area-inset-right)) 0 max(14px,env(safe-area-inset-left));background:var(--bg);border-bottom:1px solid var(--line-soft);font-size:14px}
.brand{display:flex;align-items:center;gap:9px;font-weight:600;text-decoration:none;white-space:nowrap;min-width:0}
.brand span:last-child{overflow:hidden;text-overflow:ellipsis}
/* the home glyph: a cold column of air with the warm layer across it */
.brand-mark{width:20px;height:20px;flex:none;border-radius:5px;background:linear-gradient(#3b63c4 0 22%,#f2b866 22% 48%,#7fa6dc 48% 100%);position:relative;overflow:hidden}
.brand-mark::after{content:"";position:absolute;inset:auto 0 0 0;height:9px;background:var(--ink);clip-path:polygon(0 100%,0 55%,22% 20%,40% 60%,62% 0,82% 45%,100% 25%,100% 100%)}
.topnav{display:none;gap:1px;margin-left:12px;overflow:hidden}
.topnav a{padding:6px 9px;border-radius:999px;text-decoration:none;color:var(--ink-2);white-space:nowrap}
.topnav a:hover,.topnav a[aria-current="true"]{color:var(--ink);background:var(--surface-2)}
@media (min-width:1100px){.topnav{display:flex}}
.spacer{flex:1}
.chip{padding:5px 10px;border-radius:999px;text-decoration:none;font-weight:600;font-size:13px;border:1px solid var(--line);color:var(--ink-2)}
.chip[aria-current="page"]{background:var(--ink);color:var(--bg);border-color:var(--ink)}
.icon-btn{width:36px;height:36px;flex:none;display:grid;place-items:center;border-radius:50%;border:1px solid var(--line);background:var(--surface);color:var(--ink);cursor:pointer;font:600 18px var(--sans)}
.icon-btn:hover{background:var(--surface-2)}
.i-moon{display:none}
@media (prefers-color-scheme:dark){:root:not([data-theme="light"]) .i-sun{display:none}:root:not([data-theme="light"]) .i-moon{display:block}}
:root[data-theme="dark"] .i-sun{display:none}:root[data-theme="dark"] .i-moon{display:block}
/* progress: the warm layer, drawn across the top */
.progress{position:fixed;left:0;right:0;top:var(--topbar);height:3px;z-index:41;pointer-events:none}
.progress i{display:block;height:100%;width:100%;background:var(--gold);transform-origin:0 50%;transform:scaleX(0)}

/* ---------- reading rail */
.rail{display:none}
@media (min-width:1100px){
.rail{display:flex;flex-direction:column;position:fixed;right:6px;top:50%;transform:translateY(-50%);z-index:30;padding:6px 3px;border-radius:14px;background:color-mix(in srgb,var(--bg) 88%,transparent)}
.rail-dot{position:relative;display:flex;align-items:center;justify-content:center;width:24px;height:22px;text-decoration:none}
.rail-dot .dot{width:7px;height:7px;border-radius:50%;background:var(--muted);transition:transform .2s,background .2s}
.rail-dot:hover .dot,.rail-dot:focus-visible .dot{background:var(--accent);transform:scale(1.3)}
.rail-dot[aria-current="true"] .dot{background:var(--accent);transform:scale(1.5);box-shadow:0 0 0 3px color-mix(in srgb,var(--accent) 30%,transparent)}
.rail-label{position:absolute;right:calc(100% + 6px);top:50%;transform:translate(6px,-50%);padding:3px 10px;border:1px solid var(--line);border-radius:8px;background:var(--surface);color:var(--ink);font-size:13px;font-weight:600;white-space:nowrap;opacity:0;pointer-events:none;transition:opacity .15s,transform .15s}
.rail-dot:hover .rail-label,.rail-dot:focus-visible .rail-label{opacity:1;transform:translate(0,-50%)}
}

/* ---------- the story: text on the left, the air on the right */
.story{position:relative;padding-top:var(--topbar);display:grid;grid-template-columns:minmax(340px,37%) 1fr}
.stage{grid-column:2;grid-row:1;position:sticky;top:var(--topbar);align-self:start;height:calc(100vh - var(--topbar));height:calc(100svh - var(--topbar));overflow:hidden;background:var(--bg-2);border-left:1px solid var(--line-soft)}
.stage canvas,.ex-stage canvas,.ex-nights canvas{position:absolute;inset:0;width:100%;height:100%;display:block}
.stage canvas{opacity:0;transition:opacity .6s ease}
.stage-ready .stage canvas{opacity:1}
.stage .still{position:absolute;inset:0;width:100%;height:100%;object-fit:cover}
.stage-ready .stage .still{display:none}
.loading{position:absolute;left:50%;top:50%;transform:translate(-50%,-50%);font-size:13.5px;color:var(--ink);background:var(--surface);padding:4px 12px;border-radius:999px;border:1px solid var(--line);z-index:1;margin:0}
.stage-ready .loading,.no-stage .loading{display:none}
.hud{position:absolute;right:max(54px,env(safe-area-inset-right));bottom:34px;z-index:2;pointer-events:none}
.hud-when{display:block;font:600 15px var(--sans);color:var(--ink);background:var(--surface);border:1px solid var(--line);border-radius:999px;padding:4px 13px}
.hud-when:empty{display:none}
.steps{grid-column:1;grid-row:1;margin:0;padding:0 0 18vh;list-style:none}
.step{min-height:96vh;min-height:96svh;display:flex;align-items:center;padding:0 clamp(20px,3.2vw,46px)}
.step.hero{min-height:calc(100vh - var(--topbar));min-height:calc(100svh - var(--topbar))}
.step.tall{min-height:calc(var(--tall) * 100vh);min-height:calc(var(--tall) * 100svh);align-items:flex-start}
.step.tall .step-card{position:sticky;top:calc(var(--topbar) + 18vh)}
.step-card,.hero-card{width:100%}
.step-card h2{font-size:clamp(25px,2.3vw,32px);line-height:1.12;margin:0 0 12px}
.step-card p{margin:0 0 12px;color:var(--ink-2)}
.step-card strong,.hero-card strong,.prose strong{color:var(--ink);font-weight:600}
.when,.kicker{font:600 12.5px var(--sans);letter-spacing:.09em;text-transform:uppercase;color:var(--accent);margin:0 0 9px}
h1{font-size:clamp(33px,3.7vw,54px);line-height:1.04;letter-spacing:-.012em;margin:0 0 16px}
.deck{font-family:var(--serif);font-size:clamp(19px,1.55vw,22px);line-height:1.38;margin:0 0 18px;color:var(--ink-2)}
.hero-actions{display:flex;flex-wrap:wrap;align-items:center;gap:10px 16px}
.scroll-cue{font-size:14px;color:var(--muted)}
.btn{display:inline-flex;align-items:center;justify-content:center;gap:8px;min-height:44px;padding:9px 18px;border-radius:999px;border:1px solid var(--line);background:var(--surface);color:var(--ink);font:600 15px var(--sans);cursor:pointer;text-decoration:none}
.btn:hover{background:var(--surface-2);color:var(--ink)}
.btn.primary{background:var(--ink);color:var(--bg);border-color:var(--ink)}
.btn.primary:hover{background:var(--ink-2);color:var(--bg)}
.btn.small{min-height:38px;padding:6px 14px;font-size:14px}

@media (max-width:859px){
  /* phones: the picture keeps the top of the screen, the text passes below it */
  .story{display:block}
  .stage{height:40vh;height:40svh;z-index:5;border-left:0;border-bottom:1px solid var(--line)}
  .steps{padding-bottom:10vh}
  .step{min-height:70vh;min-height:70svh;align-items:flex-start;padding:22px 18px 0}
  .step.hero{min-height:0;padding:18px 18px 34px}
  .step.tall .step-card{top:calc(var(--topbar) + 40svh + 14px)}
  .hud{right:8px;bottom:24px}
  .hud-when{font-size:12.5px;padding:2px 9px}
  .back-top{min-width:44px;width:44px;height:44px;padding:0;justify-content:center;left:auto;right:8px;bottom:calc(8px + env(safe-area-inset-bottom));opacity:.94}
  .back-top span{position:absolute;width:1px;height:1px;overflow:hidden;clip:rect(0 0 0 0)}
}

/* ---------- after the story */
.after{position:relative;z-index:6;background:var(--bg);border-top:1px solid var(--line)}
.explorer{padding:56px max(18px,4vw) 30px;max-width:1500px;margin:0 auto}
.ex-head{max-width:760px}
.explorer h2,.prose h2{font-size:clamp(28px,3.2vw,40px);line-height:1.08;margin:0 0 14px}
.ex-head p{color:var(--ink-2);margin:0 0 18px}
.ex-grid{display:grid;grid-template-columns:minmax(300px,380px) 1fr;gap:26px;align-items:start}
.ex-side{position:sticky;top:calc(var(--topbar) + 14px)}
.pick{display:grid;grid-template-columns:1fr 1fr;gap:10px 12px;align-items:end;margin-bottom:16px}
.pick .btn{grid-column:1/-1}
.field label{display:block;font-weight:600;font-size:14.5px;margin-bottom:5px}
.field input,.field select{width:100%;min-height:46px;padding:8px 10px;border-radius:12px;border:1.5px solid var(--muted);background:var(--surface);color:var(--ink);font:500 16px var(--sans)}
.result{border:1px solid var(--line);border-radius:14px;background:var(--surface);padding:16px 18px}
.res-empty{margin:0;color:var(--muted);font-size:15.5px}
.result h3{font-size:25px;line-height:1.1;margin:0 0 8px}
.res-main{font-family:var(--serif);font-size:21px;line-height:1.32;margin:0 0 10px;color:var(--ink)}
.result p{margin:0 0 8px;color:var(--ink-2)}
.res-src{font-size:14px;color:var(--muted)!important}
.res-msg{font-size:14.5px;color:var(--accent-2)!important;margin:8px 0 0!important}
.res-msg:empty{display:none}
.to-story{font-size:15px;margin:14px 2px 0}
.ex-stage{position:relative;height:min(46vh,430px);border:1px solid var(--line);border-radius:14px;overflow:hidden;background:var(--bg-2)}
.ex-stage .btn{position:absolute;left:10px;top:10px;z-index:2}
.ex-nights{position:relative;height:calc(58 * 9px + 70px);border:1px solid var(--line);border-radius:14px;overflow:hidden;background:var(--bg);margin-top:12px;touch-action:pan-y}
.timebar{display:grid;grid-template-columns:auto 1fr;gap:6px 16px;align-items:center;margin-top:12px}
.timeslider{min-width:0}
.timeslider input{width:100%;margin:0;accent-color:var(--accent);height:28px}
.timeticks{display:flex;justify-content:space-around;font:600 12.5px var(--sans);color:var(--muted)}
.hint{font-size:14px;color:var(--muted);margin:8px 0 0}
.legend{display:flex;flex-wrap:wrap;gap:6px 16px;font-size:13.5px;color:var(--muted);margin:6px 0 0}
.legend span{display:inline-flex;align-items:center;gap:6px}
.lg{display:inline-block;width:12px;height:12px;border-radius:2px}
.lg.warm{background:var(--lg-warm)}.lg.cold{background:var(--lg-cold)}.lg.none{background:var(--s-none);border:1px solid var(--line)}
@media (max-width:859px){
  .explorer{padding:40px 16px 20px}
  .ex-grid{grid-template-columns:1fr;gap:14px}
  .ex-side{position:static}
  .ex-stage{position:sticky;top:var(--topbar);z-index:4;height:38vh;height:38svh;border-radius:0;margin:0 -16px;border-left:0;border-right:0}
  .ex-nights{height:calc(58 * 6px + 40px)}
}

.prose{max-width:760px;margin:0 auto;padding:26px max(18px,4vw) 40px}
.block{padding:26px 0 8px}
.prose p{color:var(--ink-2);margin:0 0 14px}
.tablewrap{overflow-x:auto;margin:14px 0 14px;border:1px solid var(--line);border-radius:12px;background:var(--surface)}
table{border-collapse:collapse;width:100%;font-size:15px}
caption{caption-side:bottom;text-align:left;padding:9px 12px;font-size:13.5px;color:var(--muted);border-top:1px solid var(--line-soft)}
th,td{padding:9px 12px;text-align:left;vertical-align:top;border-bottom:1px solid var(--line-soft)}
thead th{font-size:12.5px;letter-spacing:.05em;text-transform:uppercase;color:var(--muted);border-bottom:1px solid var(--line)}
tbody tr:last-child th,tbody tr:last-child td{border-bottom:0}
td.num{text-align:right}
tbody th{font-weight:600}
.sources{padding-left:1.1em;margin:0 0 16px}
.sources li{margin-bottom:9px;color:var(--ink-2);font-size:15.5px}
.related{font-size:15.5px}
.share{margin:14px 0}
.share-row{display:flex;flex-wrap:wrap;align-items:center;gap:8px}
.share-label{font-size:14px;color:var(--muted);margin-right:4px}
.ic{width:40px;height:40px;display:grid;place-items:center;border-radius:50%;border:1px solid var(--line-soft);background:transparent;color:var(--ink);cursor:pointer;text-decoration:none}
.ic:hover,.ic:focus-visible{color:var(--accent);border-color:var(--accent)}
@media (pointer:coarse){.ic{width:44px;height:44px}}
.share-msg{font-size:13.5px;color:var(--muted);margin:6px 0 0;min-height:1.2em}
.site-footer{display:flex;flex-wrap:wrap;gap:8px 22px;justify-content:center;padding:26px 18px calc(34px + env(safe-area-inset-bottom));border-top:1px solid var(--line);font-size:14px;color:var(--muted)}
.back-top{position:fixed;left:max(16px,env(safe-area-inset-left));bottom:calc(16px + env(safe-area-inset-bottom));z-index:45;min-width:48px;height:48px;padding:0 14px;border-radius:999px;border:1px solid var(--line);background:var(--surface);color:var(--ink);font:600 14px var(--sans);display:flex;align-items:center;gap:6px;cursor:pointer;box-shadow:0 6px 18px rgba(0,0,0,.2)}
.place-page main{max-width:640px;margin:18vh auto;padding:0 20px}
.place-page h1{font-size:32px}
@media (prefers-reduced-motion:reduce){*{transition:none!important;scroll-behavior:auto!important}}
@media print{.topbar,.rail,.stage,.back-top,.progress,.ex-grid{display:none}.story{display:block}.step{min-height:0;padding:8px 0}}