/* gaura-neagra: the picture is a view into space and stays dark in both themes; the page round it is paper by day and
   near-black by night. Gold for the gas, blue-white for light the fall has shifted. */
@font-face{font-family:"Source Serif 4";font-weight:200 900;font-style:normal;font-display:swap;src:url("fonts/SourceSerif4-400-latin.woff2") format("woff2");unicode-range:U+0000-00FF,U+0131,U+0152-0153,U+02BB-02BC,U+02C6,U+02DA,U+02DC,U+0304,U+0308,U+0329,U+2000-206F,U+20AC,U+2122,U+2191,U+2193,U+2212,U+2215,U+FEFF,U+FFFD}
@font-face{font-family:"Source Serif 4";font-weight:200 900;font-style:normal;font-display:swap;src:url("fonts/SourceSerif4-400-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:"IBM Plex Sans";font-weight:100 700;font-style:normal;font-display:swap;src:url("fonts/IBMPlexSans-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+0304,U+0308,U+0329,U+2000-206F,U+20AC,U+2122,U+2191,U+2193,U+2212,U+2215,U+FEFF,U+FFFD}
@font-face{font-family:"IBM Plex Sans";font-weight:100 700;font-style:normal;font-display:swap;src:url("fonts/IBMPlexSans-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}

:root{
  --bg:#f6f2e9;--surface:#fdfaf3;--ink:#16141b;--ink-soft:#45414d;--line:#cfc8b8;--line-soft:#e3ddcf;
  --accent:#7a4300;--on-accent:#fdfaf3;--you:#143f7a;
  --space:#05060a;--glass:rgba(8,9,14,.985);--star:#f3efe6;--star-soft:#d2ccbe;--gold:#f5bd6a;--glass-line:#3b3e4c;
  --serif:"Source Serif 4",Georgia,serif;--sans:"IBM Plex Sans",system-ui,sans-serif;
  --top:44px;--col:420px;
}
@media (prefers-color-scheme:dark){:root:not([data-theme="light"]){
  --bg:#07080d;--surface:#10121a;--ink:#f1ede4;--ink-soft:#c3bdb0;--line:#333746;--line-soft:#1d202b;
  --accent:#f5bd6a;--on-accent:#0b0a08;--you:#a9cbff;
}}
:root[data-theme="dark"]{
  --bg:#07080d;--surface:#10121a;--ink:#f1ede4;--ink-soft:#c3bdb0;--line:#333746;--line-soft:#1d202b;
  --accent:#f5bd6a;--on-accent:#0b0a08;--you:#a9cbff;
}
*{box-sizing:border-box}
[hidden]{display:none!important}
svg[hidden]{display:none}
html{scroll-behavior:smooth;-webkit-text-size-adjust:100%}
@media (prefers-reduced-motion:reduce){html{scroll-behavior:auto}}
body{margin:0;background:var(--bg);color:var(--ink);font:400 18px/1.6 var(--serif)}
a{color:var(--accent);text-underline-offset:.16em}
a:focus-visible,button:focus-visible,select:focus-visible,input:focus-visible,canvas:focus-visible{outline:2px solid var(--accent);outline-offset:2px}
h1,h2,h3{font-family:var(--serif);font-weight:650;line-height:1.14;letter-spacing:-.01em;margin:0}
b{font-weight:650}
.skip{position:absolute;left:-999px;top:0;background:var(--surface);color:var(--ink);padding:.5rem .8rem;z-index:90}
.skip:focus{left:8px;top:8px}

/* top bar */
/* the bar belongs to the picture under it: dark in both themes */
.topbar{position:sticky;top:0;z-index:40;height:var(--top);display:flex;align-items:center;gap:14px;padding:0 16px;background:var(--space);color:var(--star);border-bottom:1px solid var(--glass-line);font:500 14px/1 var(--sans);white-space:nowrap}
.topbar a{color:var(--star);text-decoration:none}
.topbar a:focus-visible,.topbar button:focus-visible{outline-color:var(--gold)}
.topbar .home{display:flex;align-items:center;gap:7px;font-weight:600}
.home-ico{color:var(--gold);flex:none}
.topnav{display:flex;gap:16px;overflow:hidden}
.topnav a{color:var(--star-soft)}
.topnav a:hover,.topnav a[aria-current]{color:var(--gold)}
.spacer{flex:1}
.lang-switch{border:1px solid var(--glass-line);border-radius:999px;padding:6px 10px;font-weight:600;font-size:12px}
.icon-btn{width:32px;height:32px;display:grid;place-items:center;border:1px solid var(--line);border-radius:50%;background:none;color:var(--ink);cursor:pointer;padding:0}
.icon-btn svg{display:block}
.topbar .icon-btn{color:var(--star);border-color:var(--glass-line)}
.progress{position:absolute;left:0;right:0;bottom:-1px;height:1px;pointer-events:none}
.progress span{opacity:0;position:absolute;left:0;top:-5px;width:11px;height:11px;border-radius:50%;border:2.5px solid var(--gold);background:var(--space);will-change:transform}
@media (max-width:760px){.topnav{display:none}}

/* reading rail */
.rail{position:fixed;right:10px;top:50%;transform:translateY(-50%);z-index:30;display:none;flex-direction:column;gap:9px;padding:8px 5px;border-radius:999px;background:color-mix(in srgb,var(--bg) 86%,transparent)}
.rail a{position:relative;display:block;width:9px;height:9px;border-radius:50%;border:1.5px solid var(--ink-soft)}
.rail a[aria-current]{background:var(--accent);border-color:var(--accent)}
.rail a span{position:absolute;right:18px;top:50%;transform:translateY(-50%);white-space:nowrap;font:500 12px/1 var(--sans);color:var(--ink);background:var(--surface);border:1px solid var(--line-soft);padding:5px 8px;border-radius:6px;opacity:0;pointer-events:none}
.rail a:hover span,.rail a:focus-visible span{opacity:1}
@media (min-width:1180px){.rail{display:flex}}
@media print{.rail,.topbar,.share-row,.stage{display:none!important}}

/* the fall: plain cards with a still picture each, until the live picture is running */
.story{position:relative;scroll-margin-top:var(--top)}
.stage{display:none}
.steps{max-width:720px;margin:0 auto;padding:0 20px;display:grid;gap:22px}
.step{background:var(--surface);border:1px solid var(--line-soft);border-radius:14px;padding:18px 20px 16px;scroll-margin-top:calc(var(--top) + 12px)}
.step .when{font:600 12.5px/1.2 var(--sans);letter-spacing:.07em;text-transform:uppercase;color:var(--accent);margin:0 0 7px}
.step h2{font-size:1.36rem;margin:0 0 8px}
.step p{margin:0 0 9px;font-size:1rem;line-height:1.52}
.still{margin:12px 0 2px}
.still img,.pic img{display:block;width:100%;height:auto;border-radius:8px;background:var(--space)}
.step.hero{background:none;border:0;padding:34px 0 8px}
.kicker{font:600 13px/1.2 var(--sans);letter-spacing:.09em;text-transform:uppercase;color:var(--accent);margin:0 0 12px}
h1{font-size:clamp(1.95rem,5.2vw,3.1rem)}
.deck{font-size:1.14rem!important;line-height:1.5!important;color:var(--ink-soft);margin:16px 0 0!important}
.deck2{font:400 .9rem/1.45 var(--sans)!important;color:var(--ink-soft);margin:16px 0 0!important}
.opened{margin:14px 0 0!important;font:500 .98rem/1.45 var(--sans)!important;color:var(--you)}
.jump{display:flex;flex-wrap:wrap;gap:10px;margin:20px 0 0!important}
.btn{display:inline-block;font:600 .95rem/1.2 var(--sans);padding:12px 17px;min-height:44px;border-radius:999px;background:var(--accent);color:var(--on-accent);text-decoration:none;border:1px solid var(--accent);cursor:pointer}
.btn.ghost{background:none;color:var(--ink);border-color:var(--line)}

/* the live picture */
.story.is-live .stage{display:block;position:sticky;top:var(--top);height:calc(100vh - var(--top));height:calc(100svh - var(--top));overflow:hidden;background:var(--space)}
#view{position:absolute;inset:0;width:100%;height:100%;display:block;touch-action:pan-y;cursor:grab}
#view:active{cursor:grabbing}
.story.is-live .steps{--ink:var(--star);--ink-soft:var(--star-soft);--accent:var(--gold);--on-accent:#0b0a08;--line:var(--glass-line);--you:#a9cbff;
  position:relative;z-index:2;display:block;max-width:none;margin:calc(var(--top) - 100vh) 0 0;margin-top:calc(var(--top) - 100svh);padding:0 14px 62vh;pointer-events:none;color:var(--ink)}
.story.is-live .step{pointer-events:auto;max-width:440px;margin:0 auto 84vh;background:var(--glass);border-color:var(--glass-line);}
.story.is-live .still{display:none}
.story.is-live .step.hero{max-width:560px;margin-bottom:64vh;padding:20px 20px 18px;border:0;border-radius:16px;background:rgba(5,6,10,.985)}
.story.is-live .steps::before{content:"";display:block;height:44vh;height:44svh}
.story.is-live .btn.ghost{background:none}
@media (max-width:959px){
  .story.is-live .step p{font-size:.95rem;line-height:1.46}.story.is-live .step h2{font-size:1.2rem}.story.is-live .step{padding:14px 16px 11px}
  .story.is-live h1{font-size:1.66rem}.story.is-live .deck{font-size:1rem!important;margin-top:12px!important}.story.is-live .deck2{font-size:.82rem!important;margin-top:12px!important}.story.is-live .jump{margin-top:14px!important}
  .story.is-live .steps::before{height:38vh;height:38svh}
  .story.is-live .step.hero{padding:16px 16px 14px}
}
@media (min-width:960px){
  .story.is-live .steps{padding-left:28px}
  .story.is-live .step{width:var(--col);max-width:none;margin-left:0;margin-right:0}
  .story.is-live .step.hero{width:520px}
  .story.is-live .steps::before{height:13vh}
}
.hud{position:absolute;right:14px;top:12px;z-index:3;padding:10px 13px 9px;border-radius:12px;background:var(--glass);border:1px solid var(--glass-line);color:var(--star);font:500 13px/1.3 var(--sans);min-width:214px}
.hud p{margin:0}
.hud-hole{display:flex;align-items:center;gap:8px;margin:0 0 7px;font-size:11.5px;letter-spacing:.05em;text-transform:uppercase;color:var(--star-soft)}
.hud-hole select{flex:1;font:600 13px/1.2 var(--sans);color:var(--star);background:#12141c;border:1px solid var(--glass-line);border-radius:7px;padding:6px 8px;min-height:32px}
.hud-row{display:flex;align-items:baseline;gap:6px;flex-wrap:wrap;color:var(--star-soft)}
.hud-row b{font:650 1.28rem/1.25 var(--serif);color:var(--gold);font-variant-numeric:tabular-nums}
.hud-exp{font-size:11.5px;color:var(--star-soft);margin-top:3px!important;font-variant-numeric:tabular-nums}
.hud-row small{flex-basis:100%;font-size:12px;color:var(--star-soft);margin:-2px 0 3px;font-variant-numeric:tabular-nums}
.stage-ctl{position:absolute;right:14px;bottom:16px;z-index:3;display:flex;flex-direction:column;align-items:flex-end;gap:8px}
.pill{font:600 12.5px/1.2 var(--sans);color:var(--star);background:var(--glass);border:1px solid var(--glass-line);border-radius:999px;padding:9px 13px;min-height:36px;cursor:pointer}
.pill:hover{border-color:var(--gold);color:var(--gold)}
.drag-hint{font:500 12px/1.2 var(--sans);color:var(--star-soft);background:var(--glass);border-radius:999px;padding:6px 10px}
@media (max-width:959px){
  .hud{left:10px;right:auto;top:8px;padding:7px 10px 6px;min-width:0;max-width:62vw;font-size:12px}
  .hud-hole{margin-bottom:4px;flex-direction:column;align-items:stretch;gap:3px;font-size:10.5px}.hud-hole select{font-size:12px;padding:4px 6px;min-height:30px}
  .hud-row b{font-size:1.02rem}.hud-row small{margin:-1px 0 1px;font-size:11.5px}
  .stage-ctl{top:8px;bottom:auto;right:10px}
  .drag-hint{max-width:112px;text-align:right;border-radius:10px;font-size:11.5px}
  .hud{max-width:58vw}
  .pill{padding:8px 10px;font-size:12px}
}
@media (pointer:coarse){.pill{min-height:44px}.hud-hole select{min-height:36px}}

/* the fall without the text */
html.cinema{overflow:hidden}
html.cinema .stage{position:fixed!important;inset:0;top:0!important;height:100%!important;z-index:80}
html.cinema .steps,html.cinema .topbar,html.cinema .rail{visibility:hidden}
html.cinema #view{touch-action:none}
html.cinema .to-top-x{display:none!important}
.cine{position:absolute;left:0;right:0;bottom:0;z-index:4;display:flex;flex-wrap:wrap;align-items:center;gap:10px 16px;padding:12px 16px calc(12px + env(safe-area-inset-bottom));background:var(--glass);border-top:1px solid var(--glass-line);color:var(--star);font:500 13px/1.3 var(--sans)}
.play{display:inline-flex;align-items:center;gap:8px;font:600 .95rem/1.2 var(--sans);padding:11px 16px;min-height:44px;border-radius:999px;background:var(--gold);color:#0b0a08;border:1px solid var(--gold);cursor:pointer}
.play .ic-pause{display:none}
.play[data-on] .ic-pause{display:inline}
.play[data-on] .ic-play{display:none}
.cine-range{display:flex;align-items:center;gap:10px;flex:1;min-width:220px;color:var(--star-soft)}
.cine-range input{flex:1;accent-color:var(--gold);min-height:32px}
.cine-rate{margin:0;flex-basis:100%;color:var(--star);min-height:1.3em}
.cine-x{position:fixed;left:14px;top:14px;width:44px;height:44px;color:var(--star);background:var(--glass);border-color:var(--glass-line)}
html.cinema .stage-ctl{bottom:120px;top:auto}
html.cinema .hud{top:12px}
@media (max-width:959px){html.cinema .hud{left:auto;right:10px}html.cinema .stage-ctl{right:10px}}

/* sections */
.sec{max-width:720px;margin:0 auto;padding:64px 20px 0;scroll-margin-top:var(--top)}
.sec h2{font-size:clamp(1.55rem,3.6vw,2.1rem);margin-bottom:14px}
.sec h3{font-size:1.22rem;margin:28px 0 8px}
.sec p{margin:0 0 14px}

/* the reader's fall */
.pick{display:grid;gap:14px;margin:20px 0 6px}
.chips{border:0;margin:0;padding:0;display:grid;gap:8px;grid-template-columns:1fr 1fr}
.chips legend,.height span{font:600 12.5px/1.2 var(--sans);letter-spacing:.04em;color:var(--ink-soft);padding:0;margin:0 0 7px}
.chip{position:relative;display:block;cursor:pointer}
.chip input{position:absolute;opacity:0;inset:0;width:100%;height:100%;margin:0;cursor:pointer}
.chip span{display:block;height:100%;border:1px solid var(--line);border-radius:12px;padding:10px 12px;background:var(--surface);font:400 .86rem/1.3 var(--sans);color:var(--ink-soft)}
.chip b{display:block;font:650 1.06rem/1.25 var(--serif);color:var(--ink)}
.chip small{font-size:inherit}
.chip input:checked+span{border-color:var(--accent);box-shadow:inset 0 0 0 1px var(--accent)}
.chip input:focus-visible+span{outline:2px solid var(--accent);outline-offset:2px}
.height{display:grid;justify-items:start}
.height input{font:500 1.05rem/1.2 var(--sans);color:var(--ink);background:var(--surface);border:1px solid var(--line);border-radius:8px;padding:10px 12px;min-height:44px;width:7.5em}
.reset{font:600 .92rem/1.2 var(--sans);color:var(--ink);background:none;border:1px solid var(--line);border-radius:999px;padding:11px 15px;min-height:44px;cursor:pointer;justify-self:start}
.result{margin:18px 0 6px;padding:20px 20px 16px;background:var(--surface);border:1px solid var(--you);border-radius:14px}
.result .kicker{color:var(--you);margin-bottom:8px}
.result h3{font-size:clamp(1.3rem,3.4vw,1.7rem);margin:0 0 12px}
.result p{font-size:1.02rem;margin:0 0 10px}
.share-row{display:flex;align-items:center;flex-wrap:wrap;gap:8px;margin:16px 0 0;font:500 .9rem/1.2 var(--sans);color:var(--ink-soft)}
.share-row a,.share-row button{width:40px;height:40px;display:grid;place-items:center;border:1px solid var(--line-soft);border-radius:50%;background:none;color:var(--ink);cursor:pointer;padding:0}
.share-row a:hover,.share-row button:hover,.share-row a:focus-visible,.share-row button:focus-visible{color:var(--accent);border-color:var(--accent)}
.share-row [role=status]{flex-basis:100%;min-height:1.2em}
@media (pointer:coarse){.share-row a,.share-row button{width:44px;height:44px}}
@media (max-width:420px){.chips{grid-template-columns:1fr}}

/* tables and photographs */
.tblwrap{overflow-x:auto}
.tbl{width:100%;border-collapse:collapse;font:400 .95rem/1.35 var(--sans);margin:14px 0 4px}
.tbl th,.tbl td{text-align:left;padding:8px 12px 8px 0;border-bottom:1px solid var(--line-soft);vertical-align:top}
.tbl thead th{font-weight:600;font-size:.82rem;letter-spacing:.03em;color:var(--ink-soft)}
.tbl tbody th{font-weight:600;white-space:nowrap}
.tbl td{font-variant-numeric:tabular-nums}
.note{font:400 .84rem/1.4 var(--sans);color:var(--ink-soft)}
.pair{display:grid;gap:16px;margin:18px 0 20px}
@media (min-width:640px){.pair{grid-template-columns:1fr 1fr}}
.pic{margin:0}
.pic figcaption{font:400 .82rem/1.42 var(--sans);color:var(--ink-soft);margin-top:7px}
.pic .cr{display:block}
.src{padding-left:1.1em;font:400 .95rem/1.5 var(--sans)}
.src li{margin-bottom:6px}

.foot{max-width:720px;margin:72px auto 0;padding:22px 20px 44px;border-top:1px solid var(--line-soft);display:flex;flex-wrap:wrap;gap:8px 20px;font:400 .88rem/1.4 var(--sans);color:var(--ink-soft)}
.foot a{color:var(--ink)}
.d-page{max-width:760px;margin:0 auto;padding:40px 20px}
.d-page h1{font-size:clamp(1.6rem,4vw,2.3rem);margin-bottom:18px}
.d-page img{display:block;width:100%;height:auto;border-radius:10px;margin:0 0 18px}