@font-face{font-family:Fraunces;font-style:normal;font-weight:300 700;font-display:swap;src:url(fonts/fraunces-normal-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:Fraunces;font-style:normal;font-weight:300 700;font-display:swap;src:url(fonts/fraunces-normal-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:400 600;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:400 600;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}

:root{
  color-scheme:dark;
  --bg:#06121f;--bg-2:#0b1c2e;--card:rgba(6,18,31,.86);--ink:#eef2f6;--ink-2:#c3cfdb;--ink-3:#a9b8c7;
  --line:rgba(220,232,245,.28);--line-soft:rgba(220,232,245,.13);
  --accent:#ffb57a;--accent-ink:#1c0d02;--cold:#8ac4ff;--warm:#ffb57a;--grid:rgba(220,232,245,.12);
  --topbar:44px;--to-top-bg:#06121f;--to-top-fg:#eef2f6;--serif:Fraunces,Georgia,serif;--sans:"IBM Plex Sans",system-ui,-apple-system,"Segoe UI",sans-serif;
}
:root[data-theme="light"]{
  color-scheme:light;
  --bg:#f4f1ea;--bg-2:#e9e4d8;--card:rgba(244,241,234,.92);--ink:#121d28;--ink-2:#34414e;--ink-3:#46525e;
  --line:rgba(18,29,40,.3);--line-soft:rgba(18,29,40,.13);
  --accent:#9a3d06;--accent-ink:#fff;--cold:#1d5aa0;--warm:#9a3d06;--grid:rgba(18,29,40,.1);--to-top-bg:#f4f1ea;--to-top-fg:#121d28;
}
@media (prefers-color-scheme:light){:root:not([data-theme="dark"]){
  color-scheme:light;
  --bg:#f4f1ea;--bg-2:#e9e4d8;--card:rgba(244,241,234,.92);--ink:#121d28;--ink-2:#34414e;--ink-3:#46525e;
  --line:rgba(18,29,40,.3);--line-soft:rgba(18,29,40,.13);
  --accent:#9a3d06;--accent-ink:#fff;--cold:#1d5aa0;--warm:#9a3d06;--grid:rgba(18,29,40,.1);--to-top-bg:#f4f1ea;--to-top-fg:#121d28;
}}
:root[data-theme="dark"]{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(--topbar) + 10px)}
body{margin:0;background:var(--bg);color:var(--ink);font:400 18px/1.62 var(--sans);-webkit-font-smoothing:antialiased}
a{color:inherit}
.vh{position:absolute!important;width:1px;height:1px;overflow:hidden;clip:rect(0 0 0 0);white-space:nowrap}
.num{font-variant-numeric:tabular-nums}
.skip-link{position:absolute;left:12px;top:-60px;z-index:100;background:var(--accent);color:var(--accent-ink);padding:10px 14px;border-radius:8px;font-weight:600}
.skip-link:focus{top:10px}
:focus-visible{outline:2px solid var(--accent);outline-offset:2px}

/* top bar: slim, takes the scene's colours inside the story */
.topbar{position:fixed;inset:0 0 auto 0;height:var(--topbar);z-index:40;display:flex;align-items:center;gap:8px;padding:0 max(12px,env(safe-area-inset-right)) 0 max(12px,env(safe-area-inset-left));color:#eef2f6;transition:background .3s,color .3s}
html.in-story .topbar{background:linear-gradient(rgba(3,10,19,.82),rgba(3,10,19,0))}
html:not(.in-story) .topbar{background:var(--bg);color:var(--ink);border-bottom:1px solid var(--line-soft)}
.brand{display:flex;align-items:center;gap:8px;text-decoration:none;font-weight:600;font-size:14px;min-width:0}
.brand-mark{width:16px;height:16px;border-radius:50%;background:conic-gradient(from 200deg,#ff9a52,#6fb4ff,#ff9a52);flex:none}
.brand-name{white-space:nowrap;overflow:hidden;text-overflow:ellipsis}
.topnav{display:none;gap:14px;margin-left:14px;font-size:13.5px}
.topnav a{text-decoration:none;opacity:.85}.topnav a:hover{opacity:1;text-decoration:underline}
html:not(.in-story) .topnav{display:none}
@media (min-width:900px){html:not(.in-story) .topnav{display:flex}}
.spacer{flex:1}
.chips{display:flex;gap:4px}
.chip{padding:3px 8px;border-radius:999px;text-decoration:none;font-weight:600;font-size:12.5px;border:1px solid currentColor;opacity:.72;line-height:1.3}
.chip[aria-current="page"]{opacity:1}
.icon-btn{width:34px;height:34px;display:grid;place-items:center;border-radius:50%;border:1px solid currentColor;background:transparent;color:inherit;cursor:pointer;opacity:.85;flex:none}
.progress{position:absolute;left:0;right:0;bottom:-1px;height:2px;pointer-events:none}
.progress .drop{position:absolute;left:0;top:-2px;width:6px;height:6px;border-radius:50%;background:var(--accent);transform:translateX(0);will-change:transform}
html.in-story .progress .drop{background:#ffb57a}
@media (max-width:520px){.brand-name{max-width:44vw;font-size:13px}.chip{padding:3px 6px;font-size:12px}}

/* rail: hairline dots at the far edge, after the opening */
.rail{position:fixed;right:6px;top:50%;transform:translateY(-50%);z-index:30;display:none;flex-direction:column;opacity:0;transition:opacity .4s}
html.scrolled .rail{opacity:1}
@media (min-width:1240px){.rail{display:flex}}
.rail a{display:flex;align-items:center;justify-content:flex-end;gap:8px;padding:2.5px 3px;text-decoration:none;font-size:12px;color:var(--ink-2)}
html.in-story .rail a{color:#dfe7ef}
.rail .dot{width:4px;height:4px;border-radius:50%;background:currentColor;opacity:.5;flex:none}
.rail a[aria-current] .dot{opacity:1;width:7px;height:7px;background:var(--accent)}
.rail .rail-label{opacity:0;transform:translateX(4px);transition:opacity .2s,transform .2s;white-space:nowrap;background:var(--bg);color:var(--ink);padding:1px 6px;border-radius:4px}
.rail a:hover .rail-label,.rail a:focus-visible .rail-label{opacity:1;transform:none}

/* story: sticky map with step cards */
.story{position:relative;background:#030b15}
.stage{position:sticky;top:0;height:100vh;height:100svh;overflow:hidden;z-index:1;background:radial-gradient(120% 90% at 62% 40%,#0b2238 0%,#04101d 55%,#020812 100%)}
.stage canvas{position:absolute;inset:0;width:100%;height:100%;display:block}
.loading{position:absolute;left:50%;top:50%;transform:translate(-50%,-50%);color:#c9d6e3;font-size:15px;margin:0}
.hud{position:absolute;right:max(18px,env(safe-area-inset-right));bottom:18px;display:flex;flex-direction:column;align-items:flex-end;gap:10px;color:#eef2f6;text-align:right;pointer-events:none;text-shadow:0 1px 3px rgba(0,0,0,.6)}
.hud .lbl{display:block;font-size:12px;letter-spacing:.06em;text-transform:uppercase;color:#c9d6e3}
.hud .big{font:600 44px/1 var(--serif)}
.hud .note{display:block;font-size:12px;color:#c9d6e3}
.hud-amoc{display:flex;flex-direction:column;align-items:flex-end;gap:4px}
.gauge{display:block;width:150px;height:6px;border-radius:3px;background:rgba(255,255,255,.18);overflow:hidden}
.gauge span{display:block;height:100%;width:90%;background:linear-gradient(90deg,#6fb4ff,#ffb57a);border-radius:3px;transform-origin:left}
.hud-amoc .num{font-size:15px}
.hud-legend{display:flex;flex-direction:column;align-items:flex-end;gap:3px;font-size:12px;color:#c9d6e3}
.hud-legend .ramp{display:block;width:150px;height:6px;border-radius:3px;background:linear-gradient(90deg,#d6ecff,#8ec2f5,#4489d6,#2d5c9c,#33485c,#a86a3c,#f0a855)}
.hud-legend .ends{display:flex;justify-content:space-between;width:150px}
.icekey{display:flex;align-items:center;gap:6px}.icekey .sw{width:12px;height:8px;border-radius:2px;background:#f4f8fc;box-shadow:0 0 6px rgba(255,255,255,.6)}
.stagectl{position:absolute;left:max(14px,env(safe-area-inset-left));bottom:16px;z-index:3}
.steps{position:relative;z-index:2;margin-top:-100vh;margin-top:-100svh;pointer-events:none}
.step{min-height:100vh;min-height:100svh;display:flex;align-items:center;padding:calc(var(--topbar) + 20px) 24px 40px}
.step .card{pointer-events:auto;max-width:440px;background:var(--card);color:var(--ink);padding:22px 24px;border-radius:14px;border:1px solid var(--line-soft);backdrop-filter:none;box-shadow:0 10px 40px rgba(0,0,0,.25)}
.step.hero{align-items:flex-start;padding-top:calc(var(--topbar) + 6vh)}
.hero-card{max-width:560px!important}
.kicker{margin:0 0 8px;font-size:13px;letter-spacing:.07em;text-transform:uppercase;color:var(--ink-2);font-weight:600}
h1{font:600 clamp(30px,4.4vw,50px)/1.08 var(--serif);margin:0 0 14px;letter-spacing:-.01em}
.deck{font-size:19px;color:var(--ink-2);margin:0 0 18px}
.hero-actions{display:flex;gap:10px;flex-wrap:wrap}
.stepyear{margin:0 0 4px;font-size:13px;color:var(--accent);font-weight:600;letter-spacing:.04em;text-transform:uppercase}
.step h2{font:600 26px/1.18 var(--serif);margin:0 0 10px}
.step p{margin:0 0 12px}.step p:last-child{margin-bottom:0}
.anchor{opacity:0;margin-left:.3em;text-decoration:none;color:var(--ink-3);font-weight:400;font-size:.8em}
h2:hover .anchor,.anchor:focus{opacity:1}

.btn{display:inline-flex;align-items:center;gap:6px;padding:10px 16px;border-radius:999px;border:1px solid var(--line);background:transparent;color:inherit;font:600 15px/1.2 var(--sans);text-decoration:none;cursor:pointer;min-height:44px}
.btn.primary{background:var(--accent);color:var(--accent-ink);border-color:var(--accent)}
.btn.small{padding:7px 12px;font-size:14px;min-height:40px}
.btn:hover{border-color:var(--accent)}
.sbtn{display:inline-grid;place-items:center;width:40px;height:40px;border-radius:50%;border:1px solid var(--line);background:transparent;color:inherit;cursor:pointer;text-decoration:none;flex:none}
.sbtn:hover{border-color:var(--accent);color:var(--accent)}
.stage .sbtn{color:#eef2f6;border-color:rgba(255,255,255,.35);background:rgba(3,10,19,.5)}
.sbtn.big{width:46px;height:46px}
.sbtn .pa{display:none}.sbtn[data-on] .pa{display:inline}.sbtn[data-on] .pl{display:none}
@media (pointer:coarse){.sbtn{width:44px;height:44px}}

/* the article after the story */
.after{position:relative;z-index:3;background:var(--bg)}
.prose{max-width:720px;margin:0 auto;padding:40px 20px 30px}
.block{padding:34px 0 10px;border-top:1px solid var(--line-soft)}
.block:first-child{border-top:0}
.block h2{font:600 clamp(26px,3.2vw,34px)/1.15 var(--serif);margin:0 0 16px}
.block p{margin:0 0 16px}
.fig{margin:22px 0 26px}
.fig.wide{width:min(1100px,calc(100vw - 32px));margin-left:50%;transform:translateX(-50%)}
.figbox{position:relative;width:100%}
.figbox canvas{display:block;width:100%;height:auto;touch-action:pan-y}
.fig figcaption{font-size:14.5px;color:var(--ink-2);margin-top:8px;max-width:720px}
.fig.wide figcaption{margin-left:auto;margin-right:auto}
.tip{position:absolute;pointer-events:none;background:var(--bg);color:var(--ink);border:1px solid var(--line);border-radius:8px;padding:5px 9px;font-size:13.5px;line-height:1.35;white-space:nowrap;box-shadow:0 4px 16px rgba(0,0,0,.18);z-index:4}
.ctl{display:flex;align-items:center;gap:10px;flex-wrap:wrap;margin:10px auto 0;max-width:720px}
.ctl input[type=range]{flex:1;min-width:160px;accent-color:var(--accent);height:32px}
.ctl output{font-weight:600;min-width:6ch}
.ctl .state{padding:3px 10px;border-radius:999px;border:1px solid var(--line);font-size:14px}
.ctl .state.off{color:var(--cold);border-color:var(--cold)}
.months .mrow{display:flex;gap:4px;flex-wrap:wrap}
.mbtn{min-width:34px;height:36px;border-radius:8px;border:1px solid var(--line);background:transparent;color:inherit;font:600 14px var(--sans);cursor:pointer}
.mbtn[aria-pressed="true"]{background:var(--accent);color:var(--accent-ink);border-color:var(--accent)}
@media (pointer:coarse){.mbtn{min-width:40px;height:44px}}
.key{font-size:14px;color:var(--ink-2);display:flex;flex-wrap:wrap;gap:6px 14px;align-items:center;margin:8px 0 0}
.key .k{display:inline-block;width:18px;height:3px;border-radius:2px;vertical-align:middle;margin-right:5px}
.k1880{background:var(--ink-3)}.kafter{background:var(--cold)}.k1995{background:transparent;border-top:2px dashed var(--warm);height:0!important}

/* your town */
.find{display:flex;gap:8px;flex-wrap:wrap;align-items:center;margin:18px 0 6px}
.combo{position:relative;flex:1;min-width:220px}
.combo input{width:100%;font:500 17px var(--sans);padding:11px 14px;border-radius:999px;border:1px solid var(--line);background:var(--bg-2);color:var(--ink);min-height:46px}
.opts{position:absolute;left:0;right:0;top:calc(100% + 4px);margin:0;padding:4px;list-style:none;background:var(--bg);border:1px solid var(--line);border-radius:12px;z-index:20;max-height:300px;overflow:auto;box-shadow:0 10px 30px rgba(0,0,0,.25)}
.opts li{padding:8px 12px;border-radius:8px;cursor:pointer;display:flex;justify-content:space-between;gap:10px}
.opts li[aria-selected="true"],.opts li:hover{background:var(--bg-2)}
.opts li small{color:var(--ink-3)}
.near{font-size:14px;color:var(--ink-2);margin:0 0 6px;min-height:1em}
.answer{background:var(--bg-2);border-radius:14px;padding:16px 18px;margin:8px 0 6px;border:1px solid var(--line-soft)}
.answer .result{font:600 21px/1.35 var(--serif);margin:0 0 8px}
.answer .more{margin:0;color:var(--ink-2);font-size:16px}
.share{display:flex;align-items:center;gap:10px;flex-wrap:wrap;margin:12px 0 4px}
.share-label{font-size:14px;color:var(--ink-2)}
.share-row{display:flex;gap:6px;flex-wrap:wrap}
.share-msg{font-size:14px;color:var(--ink-2);min-height:1.2em;margin:4px 0 0}
.pageshare{margin-top:30px;padding-top:18px;border-top:1px solid var(--line-soft)}
.sources{padding-left:1.1em;font-size:15.5px}.sources li{margin:0 0 6px}
.site-footer{max-width:720px;margin:0 auto;padding:20px 20px 60px;display:flex;gap:18px;flex-wrap:wrap;font-size:14px;color:var(--ink-2)}

/* a term explained on hover, tap or keyboard focus */
.term{position:relative;border-bottom:1px dotted currentColor;cursor:help;white-space:nowrap}
.term:focus-visible{outline:2px solid var(--accent);outline-offset:2px;border-radius:2px}
.term-tip{position:absolute;left:50%;top:calc(100% + 8px);transform:translateX(calc(-50% + var(--dx,0px)));width:min(290px,calc(100vw - 32px));white-space:normal;background:var(--bg);color:var(--ink);border:1px solid var(--line);border-radius:10px;padding:9px 12px;font:400 14.5px/1.45 var(--sans);text-align:left;box-shadow:0 8px 24px rgba(0,0,0,.22);z-index:30;display:none;pointer-events:none}
.term:hover .term-tip,.term:focus .term-tip,.term:focus-within .term-tip{display:block}
@media print{.term-tip{display:none}}

/* phone: the map keeps the top of the screen, the text passes below it */
@media (max-width:820px){
  .story{padding-top:var(--topbar)}
  .stage{top:var(--topbar);height:40vh;height:40svh;z-index:5;border-bottom:1px solid rgba(255,255,255,.12)}
  .steps{margin-top:0;background:var(--bg)}
  .step{min-height:78vh;min-height:78svh;align-items:flex-start;padding:22px 16px 30px}
  .step .card{max-width:none;width:100%;background:transparent;border:0;box-shadow:none;padding:0}
  .step.hero{padding-top:18px}
  .hud{bottom:8px;right:10px;gap:5px}
  .hud .big{font-size:28px}
  .hud .note{display:none}
  .gauge,.hud-legend .ramp,.hud-legend .ends{width:110px}
  .hud-legend{display:none}
  .hud-amoc .lbl{display:none}
  .stagectl{bottom:8px;left:8px}
  .sbtn.big{width:44px;height:44px}
  .topbar,html.in-story .topbar{background:#040d18;color:#eef2f6}
  html:not(.in-story) .topbar{background:var(--bg);color:var(--ink)}
  h1{font-size:31px}
  .deck{font-size:17.5px}
  body{font-size:17px}
  .fig.wide{width:calc(100vw - 20px)}
}
@media (prefers-reduced-motion:reduce){*{scroll-behavior:auto!important;transition:none!important}}
@media print{.stage,.topbar,.rail,.share,.stagectl,.ctl{display:none}.steps{margin:0}.step{min-height:0}.card{background:none;border:0;box-shadow:none}}