@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}

/* A winter evening in a lamp-lit city: ink-blue night, sodium amber for the smoke and the hour. By day, warm paper. */
:root{
  color-scheme:light;
  --bg:#f6f3ee;--bg-2:#ece7df;--surface:#fffdf9;--surface-2:#efe9e0;
  --ink:#16130f;--ink-2:#2d2822;--muted:#4f483f;--line:#c9bfb1;--line-soft:#e0d8cc;
  --accent:#743008;--accent-2:#83240c;--gold:#d9822b;
  --pm:#b2470f;--no2:#1f4c86;--calm:#8a3a0c;--windy:#4c6f96;--grid:rgba(40,30,20,.13);--axis:#5b5348;
  --ramp-lo:#9fb0cc;--ramp-mid:#e08a2c;--ramp-hi:#8f150a;--m0:#f1d9b4;--m1:#e3a457;--m2:#c4651e;--m3:#7d2a08;--dot-ring:#fffdf9;
  --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:#0a0c14;--bg-2:#0e111c;--surface:#121522;--surface-2:#1b1f30;
  --ink:#f3f0ea;--ink-2:#dcd6cb;--muted:#b3ac9f;--line:#30344a;--line-soft:#21253a;
  --accent:#ffb35c;--accent-2:#ff9b6b;--gold:#ffb35c;
  --pm:#ffb35c;--no2:#8fb6f0;--calm:#ffb35c;--windy:#8fb6f0;--grid:rgba(255,255,255,.1);--axis:#b3ac9f;
  --ramp-lo:#7b8cc4;--ramp-mid:#ffc46e;--ramp-hi:#ff4e3a;--dot-ring:#0a0c14;--m0:#8f8170;--m1:#c08544;--m2:#f0a04a;--m3:#ffe0a0;
}}
:root[data-theme="dark"]{
  color-scheme:dark;
  --bg:#0a0c14;--bg-2:#0e111c;--surface:#121522;--surface-2:#1b1f30;
  --ink:#f3f0ea;--ink-2:#dcd6cb;--muted:#b3ac9f;--line:#30344a;--line-soft:#21253a;
  --accent:#ffb35c;--accent-2:#ff9b6b;--gold:#ffb35c;
  --pm:#ffb35c;--no2:#8fb6f0;--calm:#ffb35c;--windy:#8fb6f0;--grid:rgba(255,255,255,.1);--axis:#b3ac9f;
  --ramp-lo:#7b8cc4;--ramp-mid:#ffc46e;--ramp-hi:#ff4e3a;--dot-ring:#0a0c14;--m0:#8f8170;--m1:#c08544;--m2:#f0a04a;--m3:#ffe0a0;
}
*{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:1.58;-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 night sky with the warm layer across it, over roofs */
.brand-mark{width:20px;height:20px;flex:none;border-radius:5px;background:linear-gradient(#0f1430 0 40%,#ffb35c 40% 58%,#1d2340 58% 100%);position:relative;overflow:hidden}
.brand-mark::after{content:"";position:absolute;inset:auto 0 0 0;height:8px;background:#05060c;clip-path:polygon(0 100%,0 40%,18% 40%,18% 10%,34% 10%,34% 55%,52% 55%,52% 0,66% 0,66% 45%,82% 45%,82% 25%,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}
.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{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 (out of the layout, at the edge) */
.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 city on the right */
.story{position:relative;padding-top:var(--topbar);display:grid;grid-template-columns:minmax(340px,35%) 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:#05070f}
.stage canvas{position:absolute;inset:0;width:100%;height:100%;display:block;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:#f3f0ea;background:rgba(10,12,20,.8);padding:4px 12px;border-radius:999px;border:1px solid rgba(255,255,255,.2);z-index:1;margin:0}
.stage-ready .loading,.no-stage .loading{display:none}
/* the clock of the night, top right on the picture */
.hud{position:absolute;left:clamp(56px,6vw,84px);top:16px;padding:10px 14px 8px;border-radius:14px;background:rgba(6,8,18,.55);z-index:2;pointer-events:none;display:grid;grid-template-columns:auto auto;gap:0 14px;align-items:end;color:#f3f0ea;text-shadow:0 1px 8px rgba(0,0,0,.7);opacity:0;transition:opacity .4s}
.stage-ready .hud{opacity:1}
.hud-clock{grid-row:span 2;font:600 44px/1 var(--sans);letter-spacing:-.02em}
.hud-pm{font:600 15px/1.25 var(--sans);color:#ffd6a0}
.hud-mix{font:500 13px/1.25 var(--sans);color:#d9dcea}
.hud-spark{grid-column:1/-1;width:190px;height:40px;margin-top:8px;overflow:visible}
.hud-spark .area{fill:rgba(255,179,92,.22)}.hud-spark .line{fill:none;stroke:#ffb35c;stroke-width:1.6}.hud-spark .now{fill:#fff}.hud-spark .tick{fill:rgba(255,255,255,.6);font:500 9.5px var(--sans)}
.steps{grid-column:1;grid-row:1;margin:0;padding:0 0 22vh;list-style:none}
.step{min-height:92vh;min-height:92svh;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-card,.hero-card{width:100%;max-width:520px}
.step-card h2{font-size:clamp(25px,2.3vw,33px);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,.result 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(34px,3.6vw,54px);line-height:1.04;letter-spacing:-.012em;margin:0 0 16px}
.deck{font-family:var(--serif);font-size:clamp(19px,1.5vw,22px);line-height:1.4;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:40px;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}
  .steps{padding-bottom:10vh}
  .step{min-height:68vh;min-height:68svh;align-items:flex-start;padding:22px 18px 0}
  .step.hero{min-height:0;padding:18px 18px 34px}
  .steps h2{scroll-margin-top:calc(var(--topbar) + 40svh + 14px)}
  .hud{left:40px;top:6px;gap:0 9px;padding:6px 10px}
  .hud-clock{font-size:28px}
  .hud-pm{font-size:12.5px}.hud-mix{font-size:11.5px}
  .hud-spark{width:120px;height:26px;margin-top:4px}.hud-spark .tick{display:none}
  .back-top{min-width:44px;width:44px;height:44px;padding:0;justify-content:center;right:auto;left: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)}
.prose{max-width:760px;margin:0 auto;padding:26px max(18px,4vw) 30px}
.block{padding:30px 0 6px}
.prose h2,.explorer h2{font-size:clamp(28px,3.1vw,40px);line-height:1.08;margin:0 0 14px}
.prose p{color:var(--ink-2);margin:0 0 14px}
/* figures */
.fig{margin:22px 0 22px;padding:16px 16px 12px;border:1px solid var(--line);border-radius:14px;background:var(--surface)}
.fig-h{font:600 15px var(--sans);color:var(--ink);margin:0 0 10px}
.fig-note{font-size:13.5px;color:var(--muted);margin:8px 0 0!important}
.chart{position:relative;width:100%;aspect-ratio:16/8.4;color:var(--axis)}
.chart.two{aspect-ratio:16/7.2}
.chart.small{aspect-ratio:16/10;margin:6px 0 2px}
.chart.small text{font-size:17px}.chart.small .val{font-size:19px}
.chart svg{display:block;width:100%;height:100%;overflow:visible}
.chart text{font:500 11.5px var(--sans);fill:var(--axis)}
.chart .val{font:600 12.5px var(--sans);fill:var(--ink)}
.chart .grid{stroke:var(--grid);stroke-width:1}
.chart .pm{fill:none;stroke:var(--pm);stroke-width:2.6;stroke-linejoin:round}
.chart .pm-area{fill:var(--pm);opacity:.14}
.chart .no2{fill:none;stroke:var(--no2);stroke-width:1.5;stroke-dasharray:4 3}
.chart .ghost{fill:none;stroke:var(--axis);stroke-width:1.3;opacity:.45}
.chart .band{fill:var(--pm);opacity:.07}
.chart .bar{fill:var(--pm)}
.chart .su{fill:none;stroke:var(--windy);stroke-width:2.2}
.chart .wk{fill:none;stroke:var(--pm);stroke-width:2.2}
.chart .dot{fill:var(--pm);stroke:var(--surface);stroke-width:2}
.segs{display:flex;flex-wrap:wrap;gap:6px;margin:0 0 8px}
.seg{min-height:36px;padding:5px 13px;border-radius:999px;border:1px solid var(--line);background:transparent;color:var(--ink-2);font:600 13.5px var(--sans);cursor:pointer}
.seg[aria-pressed="true"]{background:var(--ink);color:var(--bg);border-color:var(--ink)}
/* explorer: the map is the picker */
.explorer{padding:46px max(18px,4vw) 30px;max-width:1440px;margin:0 auto}
.ex-head{max-width:760px}
.ex-head p{color:var(--ink-2);margin:0 0 18px}
.ex-grid{display:grid;grid-template-columns:minmax(300px,400px) 1fr;gap:26px;align-items:start}
.ex-side{position:sticky;top:calc(var(--topbar) + 14px)}
.pick{display:grid;grid-template-columns:1fr auto;gap:10px;align-items:end;margin-bottom:10px}
.field label{display:block;font-weight:600;font-size:14.5px;margin-bottom:5px}
.field input{width:100%;min-height:46px;padding:8px 12px;border-radius:12px;border:1.5px solid var(--muted);background:var(--surface);color:var(--ink);font:500 16px var(--sans)}
.locate{margin:0 0 14px}
.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}
.res-what{font:600 12px var(--sans);letter-spacing:.07em;text-transform:uppercase;color:var(--accent);margin:0 0 4px!important}
.result h3{font-size:25px;line-height:1.12;margin:0 0 2px}
.res-city{font-size:14.5px;color:var(--muted)!important;margin:0 0 10px!important}
.res-main{font-size:19px;font-weight:500;line-height:1.38;margin:0 0 8px;color:var(--ink)!important}
.result p{margin:0 0 8px;color:var(--ink-2);font-size:15.5px}
.res-legend{font-size:13px!important;color:var(--muted)!important}
.res-legend i{display:inline-block;width:14px;height:3px;border-radius:2px;vertical-align:middle;margin:0 5px 0 0}
.res-cig{font-size:14px!important;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}
.res-list{display:flex;flex-wrap:wrap;gap:6px;margin-top:8px}
.res-list button{min-height:38px;padding:5px 12px;border-radius:999px;border:1px solid var(--line);background:var(--surface-2);color:var(--ink);font:500 14px var(--sans);cursor:pointer}
.to-story{font-size:15px;margin:14px 2px 0}
.mapfig{margin:0}
.map{position:relative;width:100%;aspect-ratio:1400/997;border-radius:10px;overflow:hidden;background:var(--bg-2);touch-action:manipulation}
.map .relief{position:absolute;inset:0;width:100%;height:100%}
.map-svg{position:absolute;inset:0;width:100%;height:100%;cursor:pointer}
.map-svg .outline{fill:none;stroke:var(--axis);stroke-width:1.4;opacity:.55}
.map-svg .st{stroke:var(--dot-ring)}
.map-svg .st.sel{stroke:var(--ink)}
.map-svg .lab{font:600 22px var(--sans);fill:var(--ink);paint-order:stroke;stroke:var(--bg);stroke-width:5px;stroke-linejoin:round;pointer-events:none}
.map-legend{display:flex;flex-wrap:wrap;align-items:center;gap:6px 14px;font-size:13px;color:var(--muted);margin:0 0 10px}
.map-legend span{display:inline-flex;align-items:center;gap:6px}.map-legend i{display:inline-block;width:12px;height:12px;border-radius:50%;border:1.5px solid var(--dot-ring);box-shadow:0 0 0 1px var(--line)}
.map-top{display:flex;flex-wrap:wrap;justify-content:space-between;align-items:center;gap:8px;margin:0 0 10px}.map-top .map-legend{margin:0}.zoom{margin:0}
.map .relief{transition:transform .5s ease}
@media (max-width:859px){
  .chart text{font-size:19px}.chart .val{font-size:20px}
  .explorer{padding:36px 16px 20px}
  .ex-grid{grid-template-columns:1fr;gap:14px}
  .ex-side{position:static;order:2}
  .ex-view{order:1}
  .chart{aspect-ratio:16/10}
}
.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;right:max(44px,env(safe-area-inset-right));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}}