@font-face{font-family:"Newsreader";font-style:normal;font-weight:200 800;font-display:swap;src:url(fonts/newsreader-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+20AC,U+2122,U+2191,U+2193,U+2212,U+2215,U+FEFF,U+FFFD}
@font-face{font-family:"Newsreader";font-style:normal;font-weight:200 800;font-display:swap;src:url(fonts/newsreader-latin-ext.woff2) format("woff2");unicode-range:U+0100-02BA,U+02BD-02C5,U+02C7-02CC,U+02CE-02D7,U+02DD-02FF,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:"Newsreader";font-style:italic;font-weight:400;font-display:swap;src:url(fonts/newsreader-italic-400-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+20AC,U+2122,U+2191,U+2193,U+2212,U+2215,U+FEFF,U+FFFD}
@font-face{font-family:"Newsreader";font-style:italic;font-weight:400;font-display:swap;src:url(fonts/newsreader-italic-400-latin-ext.woff2) format("woff2");unicode-range:U+0100-02BA,U+02BD-02C5,U+02C7-02CC,U+02CE-02D7,U+02DD-02FF,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:"Plex Sans";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+20AC,U+2122,U+2191,U+2193,U+2212,U+2215,U+FEFF,U+FFFD}
@font-face{font-family:"Plex Sans";font-weight:400 600;font-display:swap;src:url(fonts/IBMPlexSans-latin-ext.woff2) format("woff2");unicode-range:U+0100-02BA,U+02BD-02C5,U+02C7-02CC,U+02CE-02D7,U+02DD-02FF,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:"Plex Mono";font-weight:400;font-display:swap;src:url(fonts/IBMPlexMono-Regular.woff2) format("woff2")}

/* Night is the default: the subject happens at midnight. Light = paper, the Easter thread in red-egg red. */
:root{
  --bg:#070915;--bg2:#0d1124;--card:#0f1429;--ink:#eeeae1;--muted:#c4c1d2;--faint:#a9a6bb;--line:#2b3150;--line-soft:#1a1f38;
  --accent:#ffc65c;--accent-ink:#ffd58a;
  --c-thread:rgba(176,184,220,.085);--c-thread-all:rgba(176,184,220,.02);--c-gold:#f5c451;--c-gold-glow:rgba(245,196,81,.17);--c-bg:#070915;
  --c-covid:#d6cfff;--c-rusalii:#5cc8d6;--c-revelion:#ff9ec0;--c-wet:#62c6ff;--c-axis:rgba(220,220,240,.32);--c-ink:#eeeae1;--c-muted:#bdbacc;
  --c-band:rgba(255,255,255,.035);--c-pick:#ffffff;--is-dark:1;
  --serif:"Newsreader",Georgia,"Times New Roman",serif;--sans:"Plex Sans",system-ui,-apple-system,"Segoe UI",sans-serif;--mono:"Plex Mono",ui-monospace,Menlo,monospace;
  --to-top-bg:#0d1124;--to-top-fg:#eeeae1;
  color-scheme:dark;
}
@media (prefers-color-scheme:light){:root:not([data-theme="dark"]){
  --bg:#f6f1e6;--bg2:#ece5d6;--card:#fbf8f1;--ink:#1a1820;--muted:#3e3b48;--faint:#4a4756;--line:#cfc6b4;--line-soft:#e0d8c7;
  --accent:#a3221a;--accent-ink:#8a1c15;
  --c-thread:rgba(40,46,80,.07);--c-thread-all:rgba(40,46,80,.016);--c-gold:#b3261e;--c-gold-glow:rgba(0,0,0,0);--c-bg:#f6f1e6;
  --c-covid:#7b5ea7;--c-rusalii:#1f7a8c;--c-revelion:#a01f57;--c-wet:#1d5d96;--c-axis:rgba(30,30,50,.35);--c-ink:#1a1820;--c-muted:#45424f;
  --c-band:rgba(60,40,20,.045);--c-pick:#111018;--is-dark:0;--to-top-bg:#f6f1e6;--to-top-fg:#1a1820;color-scheme:light}}
:root[data-theme="light"]{
  --bg:#f6f1e6;--bg2:#ece5d6;--card:#fbf8f1;--ink:#1a1820;--muted:#3e3b48;--faint:#4a4756;--line:#cfc6b4;--line-soft:#e0d8c7;
  --accent:#a3221a;--accent-ink:#8a1c15;
  --c-thread:rgba(40,46,80,.07);--c-thread-all:rgba(40,46,80,.016);--c-gold:#b3261e;--c-gold-glow:rgba(0,0,0,0);--c-bg:#f6f1e6;
  --c-covid:#7b5ea7;--c-rusalii:#1f7a8c;--c-revelion:#a01f57;--c-wet:#1d5d96;--c-axis:rgba(30,30,50,.35);--c-ink:#1a1820;--c-muted:#45424f;
  --c-band:rgba(60,40,20,.045);--c-pick:#111018;--is-dark:0;--to-top-bg:#f6f1e6;--to-top-fg:#1a1820;color-scheme:light}

*{box-sizing:border-box}
[hidden]{display:none!important}
svg[hidden]{display:none}
html{-webkit-text-size-adjust:100%;scroll-padding-top:56px}
body{margin:0;background:var(--bg);color:var(--ink);font:400 1.0625rem/1.62 var(--sans)}
a{color:var(--accent-ink)}
a:focus-visible,button:focus-visible,input:focus-visible{outline:2px solid var(--accent);outline-offset:2px}
.skip-link{position:absolute;left:-999px;top:8px;background:var(--card);color:var(--ink);padding:8px 12px;z-index:50}
.skip-link:focus{left:8px}

/* topbar: slim, takes the night's colour */
.topbar{position:sticky;top:0;z-index:20;height:44px;display:flex;align-items:center;gap:14px;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:500 .84rem/1 var(--sans)}
.brand{display:flex;align-items:center;gap:8px;color:var(--ink);text-decoration:none;white-space:nowrap}
.brand-mark{color:var(--accent)}
.topnav{display:flex;gap:14px;overflow:hidden}
.topnav a{color:var(--muted);text-decoration:none;white-space:nowrap}
.topnav a:hover{color:var(--ink)}
.spacer{flex:1}
.chip{color:var(--muted);text-decoration:none;font:500 .78rem var(--mono);padding:4px 6px;border-radius:4px}
.chip[aria-current]{color:var(--ink);background:var(--line-soft)}
.icon-btn{background:none;border:1px solid var(--line);color:var(--ink);border-radius:50%;width:32px;height:32px;display:grid;place-items:center;cursor:pointer}
.progress{position:fixed;top:44px;left:0;right:0;height:1px;z-index:19;pointer-events:none;opacity:.7}
.progress span{display:block;height:100%;background:linear-gradient(90deg,transparent,var(--accent));transform-origin:0 50%;transform:scaleX(0)}
html:not(.past-hero) .topnav{opacity:0;pointer-events:none}
@media (max-width:760px){.topnav{display:none}.brand span{max-width:44vw;overflow:hidden;text-overflow:ellipsis}}

/* rail: hairline dots at the far edge, after the opening */
.rail{position:fixed;right:10px;top:50%;transform:translateY(-50%);z-index:15;display:flex;flex-direction:column;gap:12px;opacity:0;transition:opacity .4s}
.past-hero .rail{opacity:1}
.rail a{position:relative;display:block;width:14px;height:14px}
.rail .dot{position:absolute;inset:5px;border-radius:50%;background:var(--faint);opacity:.7}
.rail a[aria-current] .dot{background:var(--accent);inset:3px;opacity:1}
.rail-label{position:absolute;right:22px;top:50%;transform:translateY(-50%);white-space:nowrap;font:500 .78rem var(--sans);color:var(--ink);background:var(--card);border:1px solid var(--line);padding:3px 8px;border-radius:4px;opacity:0;pointer-events:none}
.rail a:hover .rail-label,.rail a:focus-visible .rail-label{opacity:1}
@media (max-width:1180px){.rail{display:none}}

/* story: the stage keeps the top of the screen on phones; beside the text on desktop */
.story{position:relative}
.stage{margin:0;position:sticky;top:44px;z-index:4;height:44svh;background:var(--bg);border-bottom:1px solid var(--line-soft)}
.stage-in{position:relative;width:100%;height:100%}
.stage canvas{position:absolute;inset:0;width:100%;height:100%;display:block}
.still{position:absolute;inset:0;width:100%;height:100%;object-fit:cover;object-position:50% 50%}
.still-l{display:none}
@media (prefers-color-scheme:light){:root:not([data-theme="dark"]) .still-d{display:none}:root:not([data-theme="dark"]) .still-l{display:block}}
:root[data-theme="light"] .still-d{display:none}:root[data-theme="light"] .still-l{display:block}
.stage.live .still{display:none!important}
.stage-year,.exp-year{position:absolute;left:12px;top:30px;margin:0;font:400 clamp(1.7rem,4.2vw,2.6rem)/1 var(--serif);color:var(--faint);opacity:.6;pointer-events:none;letter-spacing:.02em}
@media (min-width:980px){.stage-year{left:18px;top:40px}}
@media (max-width:560px){.stage-year,.exp-year{font-size:1.25rem;top:30px}}
.exp-year{top:36px}
.steps{position:relative;z-index:1}
.hero{max-width:640px;margin:0 auto;padding:22px 20px 34px}
.kicker{font:500 .8rem/1.3 var(--sans);letter-spacing:.06em;text-transform:uppercase;color:var(--accent-ink);margin:0 0 10px}
h1{font:600 clamp(1.85rem,6.4vw,3.1rem)/1.08 var(--serif);margin:0 0 14px;letter-spacing:-.01em;text-wrap:balance}
.deck{font:400 1.13rem/1.55 var(--serif);color:var(--muted);margin:0}
.step{min-height:78svh;display:flex;align-items:flex-start;padding:4svh 16px 0}
.step:last-child{min-height:60svh}
.card{max-width:560px;margin:0 auto;background:color-mix(in srgb,var(--card) 94%,transparent);border:1px solid var(--line-soft);border-radius:10px;padding:16px 18px 6px;box-shadow:0 10px 40px rgba(0,0,0,.18)}
.card h2{font:600 1.22rem/1.25 var(--serif);margin:0 0 6px}
.card p{margin:0 0 12px;font-size:1.02rem}
.anchor{margin-left:8px;color:var(--faint);text-decoration:none;font:400 .8em var(--sans);opacity:0}
h2:hover .anchor,.anchor:focus-visible{opacity:1}
@media (min-width:980px){
  .story{display:grid;grid-template-columns:minmax(360px,460px) 1fr;column-gap:28px;padding-left:max(24px,calc((100vw - 1440px)/2))}
  .stage{grid-column:2;grid-row:1;align-self:start;top:44px;height:calc(100svh - 44px);border-bottom:0;border-left:1px solid var(--line-soft)}
  .steps{grid-column:1;grid-row:1}
  .hero{padding:12svh 0 14svh}
  .step{padding:0;min-height:88svh;align-items:center}
  .step:last-child{min-height:80svh}
  .card{background:transparent;border:0;box-shadow:none;padding:0;margin:0;opacity:.45;transition:opacity .4s}
  .step.on .card{opacity:1}
  .card h2{font-size:1.5rem}
  .card p{font-size:1.1rem;line-height:1.65}
}
@media (max-width:979px) and (max-height:700px){.stage{height:40svh}}

/* explorer */
.explorer{max-width:1180px;margin:0 auto;padding:60px 20px 20px;border-top:1px solid var(--line-soft)}
.explorer h2,.sec h2{font:600 clamp(1.45rem,4vw,2rem)/1.15 var(--serif);margin:0 0 10px}
.exp-note{color:var(--muted);max-width:680px;margin:0 0 16px}
.exp-ctl{display:flex;flex-wrap:wrap;gap:12px 18px;align-items:center;margin:0 0 14px}
.years{display:flex;flex-wrap:wrap;gap:6px}
.ych,.play,.btn{font:500 .9rem/1 var(--sans);color:var(--ink);background:transparent;border:1px solid var(--line);border-radius:999px;min-height:40px;padding:0 12px;cursor:pointer}
.ych[aria-pressed="true"]{background:var(--accent);border-color:var(--accent);color:var(--bg)}
.play{border-color:var(--accent);color:var(--accent-ink)}
.play[data-on]{background:var(--line-soft)}
.dateb{display:flex;align-items:center;gap:8px;font-size:.92rem;color:var(--muted)}
.dateb input{font:500 .95rem var(--sans);color:var(--ink);background:transparent;border:1px solid var(--line);border-radius:999px;min-height:40px;padding:0 14px;color-scheme:inherit}
.dateb input:focus-visible{border-color:var(--accent)}
@media (pointer:coarse){.ych,.play,.btn{min-height:44px}}
.exp-grid{display:grid;gap:18px}
@media (min-width:900px){.exp-grid{grid-template-columns:1fr 340px;align-items:start}}
.exp-fig{position:relative;margin:0;height:min(58svh,520px);min-height:300px;background:var(--bg2);border:1px solid var(--line-soft);border-radius:10px;overflow:hidden;cursor:crosshair}
.exp-fig canvas{position:absolute;inset:0;width:100%;height:100%;touch-action:pan-y}
.answer{font-size:1.02rem}
.ans{font:500 1.12rem/1.45 var(--serif);margin:0 0 8px}
.ans2{color:var(--muted);margin:0 0 14px}
.share{display:flex;align-items:center;gap:10px;flex-wrap:wrap;margin:6px 0}
.share-label{font-size:.86rem;color:var(--muted)}
.share-row{display:flex;gap:8px}
.sbtn{width:40px;height:40px;border-radius:50%;border:1px solid var(--line-soft);background:transparent;color:var(--ink);display:grid;place-items:center;cursor:pointer;text-decoration:none}
.sbtn:hover,.sbtn:focus-visible{color:var(--accent-ink);border-color:var(--accent)}
@media (pointer:coarse){.sbtn{width:44px;height:44px}}
.share-msg{min-height:1.2em;font-size:.86rem;color:var(--muted);margin:4px 0 0}
.etab{width:100%;max-width:820px;border-collapse:collapse;margin:34px 0 0;font-size:.95rem}
.etab caption{text-align:left;font:600 1.1rem var(--serif);margin-bottom:8px}
.etab th,.etab td{text-align:left;padding:8px 10px;border-bottom:1px solid var(--line-soft);vertical-align:top}
.etab thead th{font:500 .8rem var(--sans);color:var(--muted);text-transform:uppercase;letter-spacing:.04em}
.etab tbody th a{font-weight:600}
.etab tr.y2020 td,.etab tr.y2020 th{color:var(--muted)}
@media (max-width:560px){.etab td:nth-child(5),.etab th:nth-child(5){display:none}.etab th,.etab td{padding:8px 6px}}

/* prose */
.prose{max-width:700px;margin:0 auto;padding:30px 20px 10px}
.sec{padding:34px 0 8px;border-top:1px solid var(--line-soft)}
.sec p,.sec li{max-width:66ch}
.method p{font-size:.98rem}
.sources{padding-left:18px;font-size:.92rem}
.sources li{margin:0 0 6px}
.ending{font:500 1.3rem/1.45 var(--serif);margin:46px 0 30px;text-wrap:balance}
.site-footer{max-width:720px;margin:0 auto;padding:24px 20px 70px;display:flex;gap:18px;flex-wrap:wrap;font:400 .86rem var(--sans);color:var(--muted);border-top:1px solid var(--line-soft)}
.site-footer a{color:var(--muted)}

/* neighbours: small multiples, wider than the text */
.eu-wide{width:min(1100px,calc(100vw - 32px));margin:22px 0 10px;position:relative;left:50%;transform:translateX(-50%)}
.eu-lead{font:500 1rem/1.4 var(--serif);color:var(--muted);margin:0 0 6px;max-width:none!important}
.eu-h{font:600 .8rem var(--sans);letter-spacing:.06em;text-transform:uppercase;color:var(--muted);margin:18px 0 8px}
.eu-grid{display:grid;grid-template-columns:repeat(var(--n,6),1fr);gap:14px 12px}
@media (max-width:900px){.eu-grid{grid-template-columns:repeat(3,1fr)}}
@media (max-width:520px){.eu-grid{grid-template-columns:repeat(2,1fr)}}
.eu-p{margin:0}
.eu-p figcaption{display:flex;justify-content:space-between;align-items:flex-end;gap:6px;margin-bottom:4px;min-height:2.5em}
.eu-p figcaption b{font:600 .88rem var(--sans);color:var(--ink)}
.eu-big{font:500 1.35rem/1 var(--serif);color:var(--c-gold)}
.eu-p svg{width:100%;height:auto;display:block;background:var(--bg2);border-radius:6px}
.eu-sub{font-size:.8rem!important;line-height:1.3;margin:5px 0 0;color:var(--muted)}
.eu-o{fill:none;stroke:var(--c-gold);stroke-width:1.5;opacity:.7;stroke-linejoin:round}
.eu-w{fill:none;stroke:var(--c-muted);stroke-width:1;opacity:.45;stroke-linejoin:round}
.eu-z{stroke:var(--c-axis);stroke-dasharray:3 3}
.eu-band{fill:var(--c-band)}
.eu-t{fill:var(--c-muted);font:400 15px var(--sans)}
.eu-p.home svg{outline:1px solid color-mix(in srgb,var(--c-gold) 45%,transparent);outline-offset:-1px}
.eu-key{font-size:.85rem;color:var(--muted);display:flex;flex-wrap:wrap;gap:6px 14px;align-items:center;margin:14px 0 4px;max-width:none!important}
.eu-key span{display:inline-block;width:18px;height:3px;border-radius:2px;margin-right:4px;vertical-align:middle}
.k-o{background:var(--c-gold)}.k-w{background:var(--c-muted);opacity:.6}.k-b{height:10px!important;background:var(--c-band);outline:1px solid var(--line)}
.eu-star{font-size:.86rem;color:var(--muted);max-width:80ch!important}

@media (prefers-reduced-motion:reduce){*{transition:none!important;scroll-behavior:auto!important}}
@media print{.topbar,.rail,.progress,.share,.stage,.exp-ctl,.exp-fig{display:none}.step{min-height:0}}