@font-face{font-family:"Fraunces";font-style:normal;font-weight:300 900;font-display:swap;src:url(fonts/Fraunces-display.woff2) format("woff2")}
@font-face{font-family:"Atkinson Next";font-style:normal;font-weight:200 800;font-display:swap;src:url(fonts/AtkinsonHyperlegibleNext.woff2) format("woff2")}

/* ------------------------------------------------------------------ tokens */
:root{
  color-scheme:light;
  --bg:#f4efe6; --bg-2:#ebe4d5; --surface:#fcf9f2; --surface-2:#f0e9d9;
  --text:#15191b; --text-2:#303638; --muted:#434a4d;
  --line:#c3baa6; --line-soft:#dbd2be;
  --accent:#064744; --accent-ink:#ffffff; --accent-soft:#d3e6e1;
  --ember:#7d2508; --ember-soft:#f5dccf; --ember-line:#c4471b;
  --gold:#6a4b00; --gold-soft:#f3e3b1;
  --ok:#14532d; --ok-soft:#d7eedd; --no:#8a1c1c; --no-soft:#f7d9d6;
  --sky-a:#e7eeee; --sky-b:#f6efe0; --ground:#8d8471; --ground-line:#5e5647; --water:#2b8a91; --water-line:#146066; --stage-grid:#d6ccb6; --person:#15191b;
  --rock:#b3a68d; --rock-2:#9d907a; --silt:#8a7a5a; --conductor:#d9702f; --mush:#c14a1a; --deep:#9e2a12; --moho:#15191b;
  --bar-erupt:#5b6e78; --bar-melt:#b8461a; --bar-mush:#8a6a12; --bar-bar:#0d5c58; --band:#f2d9c2;
  --shadow:0 1px 2px rgba(50,40,20,.08),0 8px 30px rgba(50,40,20,.10);
  --bar-h:3.25rem;
  --serif:"Fraunces",Georgia,"Times New Roman",serif;
  --sans:"Atkinson Next","Atkinson Hyperlegible",system-ui,-apple-system,"Segoe UI",Roboto,sans-serif;
}
:root[data-theme="dark"]{
  color-scheme:dark;
  --bg:#0c1113; --bg-2:#10171a; --surface:#151d21; --surface-2:#1b262b;
  --text:#f2ece0; --text-2:#d8d2c4; --muted:#b4bcb9;
  --line:#33454b; --line-soft:#24343a;
  --accent:#79dccb; --accent-ink:#04211d; --accent-soft:#14322f;
  --ember:#ff9d72; --ember-soft:#3a2118; --ember-line:#ff7a45;
  --gold:#ffd27a; --gold-soft:#3a2f14;
  --ok:#9be7b4; --ok-soft:#14352a; --no:#ffb0a8; --no-soft:#3d1c1a;
  --sky-a:#0d1a1f; --sky-b:#1c2325; --ground:#3c484a; --ground-line:#8aa0a3; --water:#2b8f95; --water-line:#7fe0dc; --stage-grid:#25353b; --person:#f2ece0;
  --rock:#2a3336; --rock-2:#333f42; --silt:#5a5238; --conductor:#a9501f; --mush:#e0602a; --deep:#c4381a; --moho:#f2ece0;
  --bar-erupt:#8fa6b2; --bar-melt:#ff8a55; --bar-mush:#e6bb56; --bar-bar:#79dccb; --band:#3a2a20;
  --shadow:0 1px 2px rgba(0,0,0,.4),0 10px 34px rgba(0,0,0,.45);
}
@media (prefers-color-scheme:dark){
  :root:not([data-theme="light"]){
    color-scheme:dark;
    --bg:#0c1113; --bg-2:#10171a; --surface:#151d21; --surface-2:#1b262b;
    --text:#f2ece0; --text-2:#d8d2c4; --muted:#b4bcb9;
    --line:#33454b; --line-soft:#24343a;
    --accent:#79dccb; --accent-ink:#04211d; --accent-soft:#14322f;
    --ember:#ff9d72; --ember-soft:#3a2118; --ember-line:#ff7a45;
    --gold:#ffd27a; --gold-soft:#3a2f14;
    --ok:#9be7b4; --ok-soft:#14352a; --no:#ffb0a8; --no-soft:#3d1c1a;
    --sky-a:#0d1a1f; --sky-b:#1c2325; --ground:#3c484a; --ground-line:#8aa0a3; --water:#2b8f95; --water-line:#7fe0dc; --stage-grid:#25353b; --person:#f2ece0;
    --rock:#2a3336; --rock-2:#333f42; --silt:#5a5238; --conductor:#a9501f; --mush:#e0602a; --deep:#c4381a; --moho:#f2ece0;
    --bar-erupt:#8fa6b2; --bar-melt:#ff8a55; --bar-mush:#e6bb56; --bar-bar:#79dccb; --band:#3a2a20;
    --shadow:0 1px 2px rgba(0,0,0,.4),0 10px 34px rgba(0,0,0,.45);
  }
}

/* ------------------------------------------------------------------ base */
*,*::before,*::after{box-sizing:border-box}
html{scroll-behavior:smooth;-webkit-text-size-adjust:100%;text-size-adjust:100%}
body{margin:0;background:var(--bg);color:var(--text);font-family:var(--sans);font-size:1.125rem;line-height:1.62;overflow-x:clip;text-rendering:optimizeLegibility}
img,svg{max-width:100%}
img{height:auto;display:block}
a{color:var(--accent);text-underline-offset:.18em;text-decoration-thickness:.08em}
a:hover{text-decoration-thickness:.14em}
:focus-visible{outline:3px solid var(--accent);outline-offset:3px;border-radius:4px}
button,input{font:inherit;color:inherit}
[hidden]{display:none !important}
.defs{position:absolute;width:0;height:0;overflow:hidden}
.vh{position:absolute !important;width:1px;height:1px;overflow:hidden;clip:rect(0 0 0 0);white-space:nowrap;margin:0}
.skip{position:absolute;left:-999px;top:0;background:var(--accent);color:var(--accent-ink);padding:.6rem 1rem;z-index:100;border-radius:0 0 .5rem 0}
.skip:focus{left:0}

h1,h2,h3{font-family:var(--serif);font-variation-settings:"SOFT" 100;line-height:1.06;letter-spacing:-.015em;margin:0;text-wrap:balance}
h1{font-weight:850;font-size:clamp(2.2rem,6.4vw,4.9rem)}
h2{font-weight:800;font-size:clamp(1.9rem,4.6vw,3.3rem)}
h3{font-weight:750;font-size:clamp(1.25rem,2.4vw,1.6rem);line-height:1.15}
h3.mini{font-size:1.2rem;margin:2rem 0 .7rem}
p{margin:0 0 1.1em}
.wrap{width:min(100% - 2.5rem,41rem);margin-inline:auto}
.wide{width:min(100% - 2.5rem,74rem);margin-inline:auto}
section{scroll-margin-top:calc(var(--bar-h) + .75rem)}
.chapter{padding:clamp(4rem,10vw,8rem) 0 clamp(2rem,5vw,4rem)}
.chapter-head{margin-bottom:clamp(1.2rem,3vw,2rem)}
.kicker{font-weight:700;font-size:.82rem;letter-spacing:.14em;text-transform:uppercase;color:var(--ember);margin:0 0 .9rem}
.lede{font-size:clamp(1.15rem,2.1vw,1.4rem);line-height:1.5;color:var(--text-2)}
.note{font-size:.95rem;color:var(--muted)}
strong{font-weight:700}

/* ------------------------------------------------------------------ top bar and rail */
.topbar{position:sticky;top:0;z-index:50;height:var(--bar-h);display:flex;align-items:center;gap:.4rem;padding:0 max(.75rem,env(safe-area-inset-right)) 0 max(.9rem,env(safe-area-inset-left));background:color-mix(in srgb,var(--bg) 88%,transparent);backdrop-filter:blur(10px);-webkit-backdrop-filter:blur(10px);border-bottom:1px solid var(--line-soft)}
.topbar .home{font-weight:700;font-size:.95rem;color:var(--text);text-decoration:none;white-space:nowrap;padding:.7rem .3rem}
.topnav{display:flex;gap:.1rem;overflow-x:auto;scrollbar-width:none;min-width:0;flex:0 1 auto;margin-left:.5rem}
.topnav::-webkit-scrollbar{display:none}
.topnav a{white-space:nowrap;text-decoration:none;color:var(--text-2);font-size:.95rem;padding:.7rem .6rem;border-radius:.5rem}
.topnav a[aria-current="true"]{color:var(--accent);font-weight:700}
.spacer{flex:1 1 0}
.chip{display:inline-flex;align-items:center;min-height:2.75rem;padding:0 .8rem;border:1px solid var(--line);border-radius:999px;color:var(--text);text-decoration:none;font-size:.9rem;font-weight:600;white-space:nowrap}
.icon-btn{display:inline-grid;place-items:center;width:2.75rem;height:2.75rem;border-radius:50%;border:1px solid var(--line);background:transparent;cursor:pointer;flex:none}
.icon-btn svg{display:block}
.icon-btn svg[hidden]{display:none}
.rail{display:none}
@media (min-width:76rem){
  .rail{display:flex;flex-direction:column;gap:.15rem;position:fixed;right:1.1rem;top:50%;transform:translateY(-50%);z-index:40}
  .rail-dot{display:flex;align-items:center;justify-content:flex-end;gap:.55rem;min-height:1.6rem;text-decoration:none;color:var(--text)}
  .rail-dot .dot{width:7px;height:7px;border-radius:50%;background:var(--line);transition:transform .2s,background .2s}
  .rail-dot[aria-current="true"] .dot{background:var(--ember-line);transform:scale(1.6)}
  .rail-label{font-size:.8rem;font-weight:600;opacity:0;transform:translateX(6px);transition:opacity .15s,transform .15s;background:var(--surface);border:1px solid var(--line-soft);padding:.1rem .5rem;border-radius:.4rem;pointer-events:none;white-space:nowrap}
  .rail-dot:hover .rail-label,.rail-dot:focus-visible .rail-label{opacity:1;transform:none}
}

/* ------------------------------------------------------------------ hero */
.hero{position:relative;min-height:calc(100svh - var(--bar-h));display:grid;align-items:end;overflow:clip;isolation:isolate;background:#0c1113}
.hero-photo{position:absolute;inset:0;z-index:-1}
.hero-photo img{width:100%;height:100%;object-fit:cover;object-position:50% 45%;border:0}
.hero-photo::after{content:"";position:absolute;inset:0;background:linear-gradient(180deg,rgba(8,14,16,.05) 0%,rgba(8,14,16,.05) 40%,rgba(8,14,16,.6) 100%)}
.hero-copy{position:relative;padding:clamp(1.5rem,5vw,4rem) 0 clamp(2rem,6vw,4rem);width:min(100% - 2.5rem,74rem);margin-inline:auto}
.hero-copy .panel{max-width:44rem;background:color-mix(in srgb,var(--bg) 90%,transparent);backdrop-filter:blur(8px);-webkit-backdrop-filter:blur(8px);border:1px solid var(--line-soft);border-radius:1.5rem;padding:clamp(1.2rem,3vw,2.2rem);box-shadow:var(--shadow)}
.hero h1{margin-bottom:.9rem}
.hero .deck{font-size:clamp(1.05rem,1.9vw,1.28rem);line-height:1.5;color:var(--text-2);margin:0 0 1.3rem;max-width:38rem}
.byline{font-size:.92rem;color:var(--muted);margin:1rem 0 0}
.hero-credit{font-size:.8rem;color:var(--muted);margin:.4rem 0 0}
.cta{display:inline-flex;align-items:center;gap:.6rem;min-height:3rem;padding:.2rem 1.3rem;border-radius:999px;background:var(--accent);color:var(--accent-ink);font-weight:700;text-decoration:none;border:0;cursor:pointer}
.cta:hover{filter:brightness(1.08)}
.cta svg{transition:transform .2s}
.cta:hover svg{transform:translateY(3px)}
.btn{display:inline-flex;align-items:center;justify-content:center;gap:.5rem;min-height:2.75rem;padding:.2rem 1.05rem;border-radius:999px;border:2px solid var(--accent);background:transparent;color:var(--accent);font-weight:700;cursor:pointer}
.btn.sm{font-size:.95rem}
.btn[aria-pressed="true"]{background:var(--accent);color:var(--accent-ink)}
@media (max-width:40rem){
  .topbar{gap:.15rem;padding-left:max(.6rem,env(safe-area-inset-left))}
  .topbar .home{font-size:.82rem;padding:.7rem .15rem}
  .topnav{margin-left:.15rem}
  .topnav a{font-size:.88rem;padding:.7rem .42rem}
  .chip{padding:0 .6rem;font-size:.82rem}
  .hero{min-height:calc(100svh - var(--bar-h));background:var(--bg)}
  .hero-photo{bottom:auto;height:52svh}
  .hero-photo::after{background:linear-gradient(180deg,rgba(8,14,16,0) 55%,var(--bg) 100%)}
  .hero-copy{padding:38svh 0 1.2rem}
  .hero-copy .panel{padding:1.1rem 1.1rem 1.2rem;border-radius:1.2rem}
  .hero h1{font-size:clamp(1.9rem,8.6vw,2.5rem)}
}

/* ------------------------------------------------------------------ share */
.share{padding:1.2rem 0 0}
.share-row{display:flex;flex-wrap:wrap;gap:.5rem;align-items:center}
.share-row .lab{font-size:.92rem;color:var(--muted);margin-right:.2rem}
.share-row a,.share-row button{display:inline-flex;align-items:center;min-height:3rem;padding:0 1rem;border-radius:999px;border:1px solid var(--line);background:var(--surface);color:var(--text);font-size:.95rem;font-weight:600;text-decoration:none;cursor:pointer}
.share-status{font-size:.92rem;color:var(--ok);min-height:1.2em;margin:.4rem 0 0}
.share-field{width:100%;margin-top:.5rem;padding:.6rem;border:1px solid var(--line);border-radius:.5rem;background:var(--surface);color:var(--text);font-size:.9rem}

/* ------------------------------------------------------------------ figures */
figure{margin:clamp(1.8rem,4vw,3rem) 0}
figure img{border-radius:1rem;border:1px solid var(--line-soft);background:var(--surface-2);width:100%}
figcaption{font-size:.93rem;line-height:1.5;color:var(--text-2);margin-top:.7rem}
figcaption .credit{display:block;color:var(--muted);font-size:.85rem;margin-top:.25rem}
.fig-wide{width:min(100% - 2.5rem,62rem);margin-inline:auto}

/* ------------------------------------------------------------------ the stage (ruler) */
.stage{background:var(--surface);border:1px solid var(--line-soft);border-radius:1.6rem;box-shadow:var(--shadow);overflow:clip}
.stage-controls{display:grid;gap:1rem 1.6rem;padding:1.1rem 1.2rem 1rem;border-bottom:1px solid var(--line-soft)}
@media (min-width:56rem){.stage-controls{grid-template-columns:1.5fr 1fr;padding:1.3rem 1.6rem 1.2rem}}
.ctl{min-width:0}
.ctl label,.ctl .lab{display:flex;justify-content:space-between;font-weight:700;font-size:1rem;margin-bottom:.15rem}
.lblrow{display:flex;justify-content:space-between;align-items:baseline;gap:1rem}
.lblrow label{margin:0}
.ctl output{color:var(--ember);font-variant-numeric:tabular-nums}
input[type=range]{width:100%;height:2.75rem;accent-color:var(--accent);margin:0;background:transparent}
.presets{display:flex;flex-wrap:wrap;gap:.5rem}
.ex-group{display:flex;flex-wrap:wrap;gap:.4rem}
.combo{position:relative}
.combo input{width:100%;min-height:2.9rem;padding:.4rem .9rem;border:2px solid var(--line);border-radius:.8rem;background:var(--bg);color:var(--text)}
.combo input:focus-visible{border-color:var(--accent)}
.combo ul{position:absolute;z-index:20;left:0;right:0;top:calc(100% + .25rem);margin:0;padding:.3rem;list-style:none;background:var(--surface);border:1px solid var(--line);border-radius:.8rem;box-shadow:var(--shadow);max-height:15rem;overflow:auto}
.combo li{padding:.6rem .7rem;min-height:2.75rem;border-radius:.5rem;cursor:pointer;display:flex;justify-content:space-between;gap:.6rem}
.combo li small{color:var(--muted)}
.combo li[aria-selected="true"],.combo li:hover{background:var(--accent-soft)}
.stage-view{background:linear-gradient(180deg,var(--sky-a),var(--sky-b))}
.stage-svg{display:block;width:100%;height:auto;aspect-ratio:1000/440}
@media (max-width:40rem){.stage-svg{aspect-ratio:1000/620}}
.stage-svg .sky{fill:none}
.stage-svg .ground{fill:var(--ground);stroke:var(--ground-line);stroke-width:2;stroke-linejoin:round;vector-effect:non-scaling-stroke}
.stage-svg .water{fill:var(--water);stroke:var(--water-line);stroke-width:1.5;vector-effect:non-scaling-stroke}
.stage-svg .lbl,.stage-svg .mk-l{font-family:var(--sans);font-weight:700;fill:var(--text);paint-order:stroke;stroke:var(--sky-a);stroke-width:5px;stroke-linejoin:round}
.stage-svg .lbl{font-size:26px}
.stage-svg .scalebar line{stroke:var(--text);stroke-width:3}
.stage-svg .scalebar text{font-family:var(--sans);font-size:24px;font-weight:700;fill:var(--text)}
.stage-svg .tick{stroke:var(--stage-grid);stroke-width:1;vector-effect:non-scaling-stroke}
.stage-svg .vscale{stroke:var(--text);stroke-width:3}
.stage-svg .tick-l{font-family:var(--sans);font-weight:600;fill:var(--muted);font-variant-numeric:tabular-nums}
.stage-svg .mk-l.soft{fill:var(--muted);font-weight:600}
.stage-svg .person{fill:var(--person)}
.stage-svg .band-ash{fill:var(--ember-line);opacity:.16}
.stage-svg .band-ash.far{opacity:.08}
.stage-svg .mk-line{stroke:var(--ember);stroke-width:2;stroke-dasharray:6 5;vector-effect:non-scaling-stroke}
.stage-svg .pin{fill:var(--ember);stroke:var(--sky-b);stroke-width:2}
.stage-svg .crater-br{fill:none;stroke:var(--text-2);stroke-width:2;vector-effect:non-scaling-stroke}
.stage-hud{padding:1rem 1.2rem 1.3rem;display:grid;gap:.4rem}
@media (min-width:56rem){.stage-hud{padding:1.2rem 1.6rem 1.5rem}}
.stage-say{font-size:1.12rem;margin:0}
.stage-res{font-weight:700;margin:.3rem 0 0}
.stage-res:empty{display:none}
.stage-hud .note{margin:0}
.dist{list-style:none;margin:0 0 .6rem;padding:0;display:grid;grid-template-columns:repeat(auto-fit,minmax(14rem,1fr));gap:.4rem 1.5rem}
.dist li{display:flex;justify-content:space-between;gap:1rem;border-bottom:1px solid var(--line-soft);padding:.35rem 0;font-variant-numeric:tabular-nums}

/* ------------------------------------------------------------------ charts (rows of SVG tracks) */
.chart{background:var(--surface);border:1px solid var(--line-soft);border-radius:1.4rem;box-shadow:var(--shadow);padding:1.1rem 1.2rem 1.2rem;width:min(100% - 2.5rem,62rem);margin-inline:auto}
.chart-t{font-family:var(--serif);font-variation-settings:"SOFT" 100;font-weight:750;font-size:1.25rem;line-height:1.2;color:var(--text);margin:0 0 .9rem}
.rows{list-style:none;margin:0;padding:0;display:grid;gap:.6rem}
.rows li{display:grid;grid-template-columns:minmax(0,1fr) 5.2rem;grid-template-areas:"l l" "t v";gap:.1rem .7rem;align-items:center}
.row-l{grid-area:l;display:flex;flex-direction:column}
.row-l .who{font-weight:600;line-height:1.25}
.row-l .src{font-size:.85rem;color:var(--muted)}
.rows .track{grid-area:t;width:100%}
.rows .val{grid-area:v;font-variant-numeric:tabular-nums;font-weight:700;text-align:right;font-size:.95rem}
@media (min-width:52rem){.rows li{grid-template-columns:17rem minmax(0,1fr) 6.5rem;grid-template-areas:"l t v"}}
.track .bandr{fill:var(--band);stroke:var(--ember-line);stroke-width:1.5;stroke-dasharray:5 4}
.track .bar{fill:var(--bar-bar)}
.track .bar.k-erupted{fill:var(--bar-erupt)}
.track .bar.k-melt{fill:var(--bar-melt)}
.track .bar.k-mush{fill:var(--bar-mush)}
.track .dotm{fill:var(--bar-bar);stroke:var(--surface);stroke-width:2}
.track .dotm.k-mush{fill:var(--bar-mush)}
.axis-row{margin-top:.5rem;padding-left:0}
@media (min-width:52rem){.axis-row{padding-left:17.7rem;padding-right:7.2rem}}
.axis{display:block;overflow:visible}
.axis line{stroke:var(--line);stroke-width:1}
.axis text{font-family:var(--sans);font-size:12.5px;fill:var(--muted);font-variant-numeric:tabular-nums}
.chart .note{margin:.8rem 0 0}
.charts2{display:grid;gap:1.2rem}
@media (min-width:64rem){.charts2{grid-template-columns:1fr 1fr}.charts2 .chart{width:auto;margin:0}}
.charts2 .chart{margin-inline:0}
.charts2 .rows li{grid-template-columns:minmax(0,1fr) 5.2rem;grid-template-areas:"l l" "t v"}
.charts2 .axis-row{padding:0}
.wrap-h{width:min(100% - 2.5rem,41rem);margin-inline:auto}
.tl-lede{margin:-.3rem 0 .8rem}
.tl-chips{display:flex;flex-wrap:wrap;gap:.5rem;margin-bottom:.4rem}
.tl{display:block;overflow:visible}
.tl-track{stroke:var(--line);stroke-width:1}
.tl-grid{stroke:var(--line-soft);stroke-width:1}
.tl-tl{font-family:var(--sans);font-size:12.5px;fill:var(--muted);font-variant-numeric:tabular-nums}
.tl-pt,.tl-span{fill:var(--bar-bar)}
.tl-pt.erupt,.tl-span.erupt{fill:var(--bar-melt)}
.tl-name{font-family:var(--sans);font-size:15px;font-weight:700;fill:var(--text)}
.tl-name.erupt{fill:var(--ember)}
.tl-yrs{font-family:var(--sans);font-size:13.5px;fill:var(--muted);font-variant-numeric:tabular-nums}
.oof{font-size:.95rem;color:var(--ember);font-weight:700;margin:.4rem 0 0}

/* ------------------------------------------------------------------ the word */
.legend-h{font-weight:700;margin:0 0 .5rem}
.legend{list-style:none;margin:0 0 1.2rem;padding:0;display:flex;flex-wrap:wrap;gap:.4rem 1.2rem;font-size:.95rem}
.legend li{display:flex;align-items:center;gap:.5rem}
.sw{width:.9rem;height:.9rem;border-radius:.25rem;background:var(--st)}
.stance-extinct{--st:var(--ember-line)}.stance-not{--st:var(--accent)}.stance-pams{--st:var(--gold)}.stance-none{--st:var(--line)}
.wcards{list-style:none;margin:0;padding:0;display:grid;gap:1rem;grid-template-columns:repeat(auto-fill,minmax(min(19rem,100%),1fr))}
.wcard{background:var(--surface);border:1px solid var(--line-soft);border-left:7px solid var(--st);border-radius:1rem;padding:1rem 1.15rem 1.1rem}
.wcard h3{font-size:1.15rem;margin:.1rem 0 .4rem}
.wcard p{margin:0;font-size:.98rem}
.wcard .chip-s{font-size:.78rem;font-weight:800;letter-spacing:.06em;text-transform:uppercase;color:var(--text-2);margin:0}

/* ------------------------------------------------------------------ the descent */
.descent{position:relative;margin-top:1rem}
.dpin{background:var(--surface);border-block:1px solid var(--line-soft);overflow:clip}
.dscene-static,.dscene{display:block;width:100%;height:100%;max-height:40rem}
.dscene-static .crust,.dscene .crust{fill:var(--rock)}
.dscene-static .lay,.dscene .lay{stroke:var(--text-2);stroke-width:2}
.dscene-static .lay.conductor,.dscene .lay.conductor{fill:var(--conductor);opacity:.55}
.dscene-static .lay.mush,.dscene .lay.mush{fill:var(--mush);opacity:.85}
.dscene-static .lay.deep,.dscene .lay.deep{fill:var(--deep);opacity:.8}
.dscene-static .lakebar,.dscene .water{fill:var(--water)}
.dscene .silt{fill:var(--silt)}
.dscene .air{fill:var(--sky-a)}
.dscene-static .moho,.dscene .moho{stroke:var(--moho);stroke-width:2.5;stroke-dasharray:8 6}
.dscene-static .tk,.dscene .tk{stroke:var(--muted);stroke-width:1.5}
.dscene-static text,.dscene text{font-family:var(--sans);font-weight:700;fill:var(--text);paint-order:stroke;stroke:var(--surface);stroke-width:4px;stroke-linejoin:round}
.dscene-static text{font-size:21px}
.dscene-static .tkl,.dscene .tkl{font-weight:600;fill:var(--muted)}
.dscene-static .tkl{font-size:19px}
.dscene .person{fill:var(--person)}
.dscene .mantle{fill:var(--rock-2)}
.stage-svg .ring{fill:none;stroke:var(--ember);stroke-width:2}
.dscene .reticle{stroke:var(--ember);stroke-width:2}
.dhud{position:absolute;left:.8rem;top:.8rem;background:color-mix(in srgb,var(--bg) 88%,transparent);border:1px solid var(--line-soft);border-radius:.8rem;padding:.35rem .8rem}
.dread{margin:0;font-variant-numeric:tabular-nums}
.dread .dl{color:var(--muted);font-size:.85rem}
.dread .dv{font-family:var(--serif);font-size:1.5rem;color:var(--ember)}
.dsteps{list-style:none;margin:0;padding:1rem 0 0;display:grid;gap:1rem}
.dcard{background:var(--surface);border:1px solid var(--line-soft);border-radius:1.1rem;padding:1.05rem 1.25rem 1.15rem;box-shadow:var(--shadow);width:min(100% - 2.5rem,34rem);margin-inline:auto}
.dcard h3{margin:.1rem 0 .5rem}
.dcard p:last-child{margin:0}
.dkind{font-size:.8rem;font-weight:800;letter-spacing:.06em;text-transform:uppercase;color:var(--muted);margin:0}
.dkind.k-measured{color:var(--accent)}.dkind.k-model{color:var(--gold)}.dkind.k-inferred{color:var(--ember)}
.js .dpin{position:sticky;top:var(--bar-h);height:min(48svh,26rem);z-index:3}
.js .dsteps{padding:0;gap:0}
.js .dsteps li{min-height:72svh;display:grid;align-items:center;padding:1rem 0}
.js .dsteps li:last-child{min-height:60svh}
.js .dsteps li .dcard{border-left:6px solid var(--line-soft)}
.js .dsteps li.on .dcard{border-left-color:var(--ember-line)}
@media (min-width:60rem){
  .descent{display:grid;grid-template-columns:minmax(0,1.05fr) minmax(22rem,1fr);gap:2rem;align-items:start;width:min(100% - 2.5rem,80rem);margin-inline:auto}
  .dpin{border:1px solid var(--line-soft);border-radius:1.5rem}
  .js .dpin{top:calc(var(--bar-h) + 1rem);height:calc(100svh - var(--bar-h) - 2rem);max-height:44rem}
  .dcard{width:auto;margin:0}
}

@media (max-height:34rem){.js .dpin{position:static;height:auto;max-height:none}.js .dsteps li{min-height:0;padding:.6rem 0}.dscene-static,.dscene{max-height:24rem}}

/* ------------------------------------------------------------------ the gas */
.gasbox svg{display:block;width:100%;height:auto;border-radius:1.2rem;border:1px solid var(--line-soft)}
.g-sky{fill:var(--sky-a)}
.g-ground{fill:var(--ground);stroke:var(--ground-line);stroke-width:2}
.g-gas{fill:var(--mush);opacity:.55}
.g-arrows{stroke:var(--mush);stroke-width:5;fill:none}
.g-gas.up{fill:none;stroke:var(--mush);stroke-width:3;stroke-dasharray:9 7;opacity:.9}
.g-person{fill:var(--person)}
.g-l,.g-n{font-family:var(--sans);font-weight:700;font-size:25px;fill:var(--text)}
.g-l.gas{fill:var(--text)}
.g-n{font-weight:500;font-size:20px;fill:var(--muted)}
.hazard{background:var(--ember-soft);border:2px solid var(--ember-line);border-radius:1.2rem;padding:1.1rem 1.3rem 1.2rem;margin:1.6rem 0}
.hazard h3{color:var(--ember);margin-bottom:.6rem}
.hazard ul{margin:0;padding-left:1.15rem;display:grid;gap:.55rem}
.hazard li::marker{color:var(--ember)}

/* ------------------------------------------------------------------ close, sources, footer */
.close{font-family:var(--serif);font-variation-settings:"SOFT" 100;font-weight:700;font-size:1.35rem;line-height:1.3;border-left:5px solid var(--accent);padding-left:1rem;margin-top:1.6rem}
.sources{font-size:.97rem}
.sources h3{margin:2rem 0 .6rem;font-size:1.2rem}
.sources ul{padding-left:1.1rem;margin:0}
.sources li{margin-bottom:.55rem;overflow-wrap:anywhere}
.sources .tag{font-size:.78rem;font-weight:700;letter-spacing:.05em;text-transform:uppercase;color:var(--muted);border:1px solid var(--line);border-radius:.4rem;padding:.05rem .4rem;white-space:nowrap}
.site-footer{border-top:1px solid var(--line-soft);padding:2rem 1.25rem 3rem;text-align:center;font-size:.95rem;color:var(--text-2);margin-top:4rem}
.site-footer p{margin:0}
.nf{min-height:100svh;display:grid;place-items:center;text-align:center}
.nf-main h1{font-size:clamp(2rem,6vw,3.5rem);margin-bottom:1rem}

/* ------------------------------------------------------------------ reveal on scroll (only when scripts run) */
.js .reveal{opacity:0;transform:translateY(22px);transition:opacity .7s ease,transform .7s cubic-bezier(.2,.7,.2,1)}
.js .reveal.in{opacity:1;transform:none}
.pop{animation:pop .45s cubic-bezier(.2,1.4,.4,1)}
@keyframes pop{0%{transform:scale(.94)}60%{transform:scale(1.03)}100%{transform:scale(1)}}
@media (prefers-reduced-motion:reduce){
  html{scroll-behavior:auto}
  .js .reveal,.js .reveal.in{opacity:1 !important;transform:none !important;transition:none !important}
  .pop,.cta svg{animation:none;transition:none}
}
@media print{.topbar,.rail,.share{display:none}}

@media (max-width:40rem){.tl-tl.alt,.axis text.alt{display:none}}