@font-face{font-family:Fraunces;src:url(fonts/fraunces-normal-latin.woff2) format('woff2');font-weight:300 800;font-display:swap;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;src:url(fonts/fraunces-normal-latin-ext.woff2) format('woff2');font-weight:300 800;font-display:swap;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:Newsreader;src:url(fonts/newsreader-latin.woff2) format('woff2');font-weight:200 800;font-display:swap;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:Newsreader;src:url(fonts/newsreader-latin-ext.woff2) format('woff2');font-weight:200 800;font-display:swap;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 Mono';src:url(fonts/plexmono-latin.woff2) format('woff2');font-weight:400 500;font-display:swap;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 Mono';src:url(fonts/plexmono-latin-ext.woff2) format('woff2');font-weight:400 500;font-display:swap;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{
  --bg:#eef2f6; --surface:#fbfcfd; --card:rgba(251,252,253,.93); --ink:#12202c; --ink-2:#2c3e4d; --muted:#3b4f5f;
  --line:#c3cfda; --line-soft:rgba(18,32,44,.16); --accent:#155a86; --accent-ink:#ffffff; --warm:#8a3f0a;
  --sky-top:150 182 214; --sky-hor:236 226 214; --sky-glow:.55; --ice:#2f7fb0; --open:#0a8a9a; --band:rgba(21,90,134,.12);
  --to-top-bg:#fbfcfd; --to-top-fg:#12202c; color-scheme:light;
}
@media (prefers-color-scheme:dark){:root:not([data-theme=light]){
  --bg:#0a1220; --surface:#101a2b; --card:rgba(12,20,34,.9); --ink:#eaf1f8; --ink-2:#cfdbe8; --muted:#b4c4d4;
  --line:#2a3a50; --line-soft:rgba(234,241,248,.16); --accent:#8fd0f2; --accent-ink:#0a1220; --warm:#f2b680;
  --sky-top:18 28 62; --sky-hor:150 98 104; --sky-glow:1; --ice:#8fc3ec; --open:#5fe0e8; --band:rgba(143,208,242,.14);
  --to-top-bg:#101a2b; --to-top-fg:#eaf1f8; color-scheme:dark}}
:root[data-theme=dark]{
  --bg:#0a1220; --surface:#101a2b; --card:rgba(12,20,34,.9); --ink:#eaf1f8; --ink-2:#cfdbe8; --muted:#b4c4d4;
  --line:#2a3a50; --line-soft:rgba(234,241,248,.16); --accent:#8fd0f2; --accent-ink:#0a1220; --warm:#f2b680;
  --sky-top:18 28 62; --sky-hor:150 98 104; --sky-glow:1; --ice:#8fc3ec; --open:#5fe0e8; --band:rgba(143,208,242,.14);
  --to-top-bg:#101a2b; --to-top-fg:#eaf1f8; color-scheme:dark}
[hidden]{display:none!important} svg[hidden]{display:none}
*{box-sizing:border-box}
html{-webkit-text-size-adjust:100%}
body{margin:0;background:var(--bg);color:var(--ink);font:400 1.125rem/1.6 Newsreader,Georgia,serif;-webkit-font-smoothing:antialiased}
a{color:var(--accent);text-underline-offset:.18em}
.skip{position:absolute;left:-999px;top:0}.skip:focus{left:12px;top:56px;z-index:50;background:var(--surface);padding:6px 10px}
:focus-visible{outline:2px solid var(--accent);outline-offset:2px}

/* top bar */
.top{position:fixed;top:0;left:0;right:0;height:44px;z-index:30;display:flex;align-items:center;gap:14px;padding:0 14px;
  background:linear-gradient(var(--bg),color-mix(in srgb,var(--bg) 70%,transparent));font:500 .8rem/1 'IBM Plex Mono',monospace;letter-spacing:.02em}
.top a{color:var(--ink);text-decoration:none}.top .home{display:flex;align-items:center;gap:8px}
.top .home svg{width:18px;height:18px}
.top nav{display:flex;gap:14px}.top nav a{color:var(--muted)}.top nav a:hover{color:var(--ink)}
.top .sp{flex:1}
.top button{background:none;border:0;color:var(--ink);width:36px;height:36px;display:grid;place-items:center;cursor:pointer;border-radius:50%}
.top button svg{width:19px;height:19px}
.top .lang{border:1px solid var(--line-soft);border-radius:20px;padding:5px 9px}
body.in-story .top nav{opacity:0;pointer-events:none}

/* stage */
.stage{position:fixed;inset:0;z-index:1;background:rgb(var(--sky-hor));outline:none}
.stage canvas{position:absolute;inset:0;width:100%;height:100%;touch-action:pan-y;cursor:grab;display:block}
.stage canvas:active{cursor:grabbing}
.stage #fallback{position:absolute;inset:0;width:100%;height:100%;object-fit:contain}
.labs{position:absolute;inset:0;pointer-events:none}
.lab{position:absolute;left:0;top:0;font:500 .74rem/1.2 'IBM Plex Mono',monospace;color:#13202a;background:rgba(255,255,255,.82);padding:3px 7px;border-radius:3px;white-space:nowrap;
  translate:-50% -140%;transition:opacity .3s}
.lab::after{content:'';position:absolute;left:50%;bottom:-7px;width:1px;height:7px;background:#13202a}
.nogl .labs{display:none}
#split-line{position:absolute;top:0;bottom:0;width:2px;background:#fff;box-shadow:0 0 0 1px rgba(0,0,0,.35);pointer-events:none;z-index:2}
#split-line span{position:absolute;top:50%;translate:-50% -50%;left:1px;font:500 .7rem/1 'IBM Plex Mono',monospace;background:#fff;color:#13202a;padding:5px 7px;border-radius:12px;white-space:nowrap}

/* story */
.story{position:relative;z-index:3;pointer-events:none;padding:0 0 10vh}
.step{min-height:92vh;display:flex;align-items:center;padding:0 0 0 max(4vw,24px)}
.step>.card{pointer-events:auto;width:min(29rem,40vw);background:var(--card);border:1px solid var(--line-soft);border-radius:10px;padding:22px 24px;
  backdrop-filter:blur(8px);-webkit-backdrop-filter:blur(8px)}
.step.hero{min-height:100vh;align-items:flex-end;padding-bottom:22vh}
.step.hero>.card{width:min(36rem,48vw);padding:26px 28px}
.kicker{font:500 .76rem/1.3 'IBM Plex Mono',monospace;letter-spacing:.06em;text-transform:uppercase;color:var(--muted);margin:0 0 10px}
h1{font:600 clamp(2rem,3.6vw,3.1rem)/1.06 Fraunces,Georgia,serif;letter-spacing:-.015em;margin:0 0 14px}
h1 em{font-style:normal;color:var(--accent)}
.dek{font-size:1.18rem;line-height:1.5;margin:0 0 6px;color:var(--ink-2)}
h2{font:600 clamp(1.45rem,2.2vw,1.9rem)/1.15 Fraunces,Georgia,serif;margin:0 0 12px;letter-spacing:-.01em}
h3{font:600 1.15rem/1.25 Fraunces,Georgia,serif;margin:1.4em 0 .4em}
.card p{margin:0 0 .8em}.card p:last-child{margin-bottom:0}
.yr{display:inline-block;font:500 .78rem/1 'IBM Plex Mono',monospace;color:var(--accent);border:1px solid var(--accent);border-radius:12px;padding:4px 9px;margin-bottom:10px}
.big{display:block;font:600 2.6rem/1 Fraunces,Georgia,serif;color:var(--accent);margin:2px 0 6px}
.big small{display:block;font:400 .95rem/1.35 Newsreader,Georgia,serif;color:var(--ink-2);margin-top:6px}
.note{font-size:.95rem;color:var(--muted)}
.cue{font:500 .74rem/1 'IBM Plex Mono',monospace;color:var(--muted);margin-top:14px}
figure{margin:14px 0 0}figure img{width:100%;height:auto;display:block;border-radius:4px}
figcaption{font-size:.86rem;line-height:1.4;color:var(--muted);margin-top:6px}

/* melt dock */
.dock{position:fixed;left:50%;translate:-50% 0;bottom:20px;z-index:5;width:min(620px,92vw);background:var(--card);border:1px solid var(--line-soft);border-radius:12px;padding:12px 16px 12px;
  backdrop-filter:blur(8px);-webkit-backdrop-filter:blur(8px);opacity:0;pointer-events:none;transition:opacity .35s}
.dock.on{opacity:1;pointer-events:auto}
.dock .row{display:flex;align-items:baseline;gap:12px}
#dock-yr{font:600 1.7rem/1 Fraunces,Georgia,serif;min-width:6ch}
#dock-line{font-size:.95rem;line-height:1.3;color:var(--ink-2)}
.dock .ctl{display:flex;align-items:center;gap:12px;margin-top:10px}
#melt-range{flex:1;accent-color:var(--accent);height:28px}
.dock .ends{display:flex;justify-content:space-between;font:500 .7rem/1 'IBM Plex Mono',monospace;color:var(--muted);margin-top:2px}
.dock .sch{font:500 .72rem/1.35 'IBM Plex Mono',monospace;color:var(--warm);margin-top:6px}
.btn{font:500 .8rem/1 'IBM Plex Mono',monospace;border:1px solid var(--accent);background:var(--accent);color:var(--accent-ink);border-radius:18px;padding:9px 14px;cursor:pointer;min-height:36px;white-space:nowrap}
.btn.ghost{background:none;color:var(--accent)}
#play[data-on]{background:none;color:var(--accent)}
.glfail{position:fixed;left:16px;right:16px;top:56px;z-index:6;background:var(--card);padding:10px 12px;border-radius:8px;font-size:.95rem}
.lab.pk{color:#e9f1f8;background:rgba(10,18,32,.62);border-radius:3px}
.lab.pk::after{background:#e9f1f8}
.lab.lk{background:rgba(255,255,255,.88);color:#10222f;font-weight:600}
.lab.lk::after{background:#10222f}
/* picker */
#lake-list{display:flex;flex-wrap:wrap;gap:6px;margin:10px 0 8px}
.chip{font:500 .8rem/1 'IBM Plex Mono',monospace;border:1px solid var(--line);background:none;color:var(--ink);border-radius:16px;padding:8px 11px;cursor:pointer;min-height:36px}
.chip[aria-pressed=true]{background:var(--accent);color:var(--accent-ink);border-color:var(--accent)}
#lake-card{margin-top:8px;border-top:1px solid var(--line-soft);padding-top:6px}
#lake-card h3{margin:.4em 0 .1em;font-size:1.5rem}
#lake-card .meta{font:500 .8rem/1.2 'IBM Plex Mono',monospace;color:var(--muted);margin:0 0 .6em}
#lake-card .lead{font:600 1.18rem/1.35 Fraunces,Georgia,serif;margin:.2em 0 .3em}
#lake-card .sub{font-size:.98rem;color:var(--ink-2);margin:0 0 .5em}
#lake-card svg{width:100%;height:auto;display:block;margin:6px 0 0}
#lake-card svg text{font:500 12px 'IBM Plex Mono',monospace;fill:var(--muted)}
#lake-card svg .gl{stroke:var(--line);stroke-dasharray:2 4}
#lake-card svg .iv{fill:var(--band);stroke:var(--accent);stroke-width:1}
#lake-card svg .ice{fill:var(--ice);stroke:var(--ink);stroke-width:.6}
#lake-card svg .op{fill:var(--open);stroke:var(--ink);stroke-width:.6}
#lake-card svg .no{font-style:italic}
#lake-card .cap{font-size:.84rem;color:var(--muted);line-height:1.4;margin:6px 0 .7em}
.share{margin-top:10px}
.share-row{display:flex;align-items:center;gap:8px;flex-wrap:wrap}
.share-row .lbl{font:500 .78rem/1.2 'IBM Plex Mono',monospace;color:var(--muted);margin-right:2px}
.share-row a,.share-row button.ic{width:40px;height:40px;border-radius:50%;border:1px solid var(--line-soft);background:none;color:var(--ink);display:grid;place-items:center;cursor:pointer}
.share-row a:hover,.share-row button.ic:hover,.share-row a:focus-visible,.share-row button.ic:focus-visible{color:var(--accent);border-color:var(--accent)}
@media (pointer:coarse){.share-row a,.share-row button.ic{width:44px;height:44px}}
.sh-status{display:block;font:500 .76rem/1.3 'IBM Plex Mono',monospace;color:var(--muted);min-height:1.2em;margin-top:4px}
#shared{display:flex;gap:10px;align-items:center;flex-wrap:wrap;background:var(--band);border-radius:8px;padding:10px 12px;margin:10px 0 0;font-size:1rem}
.step.melt{min-height:230vh;align-items:flex-start}
.step.melt>.card{position:sticky;top:18vh}
table.lakes{width:100%;border-collapse:collapse;font-size:.95rem;margin:12px 0}
table.lakes th,table.lakes td{text-align:left;padding:6px 8px;border-bottom:1px solid var(--line-soft);vertical-align:top}
table.lakes th{font:500 .74rem/1.3 'IBM Plex Mono',monospace;color:var(--muted)}
table.lakes td.n{font-family:'IBM Plex Mono',monospace;font-size:.88rem;white-space:nowrap}
.tw{overflow-x:auto}
/* after the story: solid sections */
.after{position:relative;z-index:4;background:var(--bg);border-top:1px solid var(--line-soft)}
.sec{max-width:46rem;margin:0 auto;padding:64px 20px 8px}
.sec.wide{max-width:68rem}
.sec p{margin:0 0 1em}
.chart{width:100%;margin:10px 0 4px}
.chart svg{width:100%;height:auto;display:block;overflow:visible}
.chart text{font:500 11px 'IBM Plex Mono',monospace;fill:var(--muted)}
.chart .ax{stroke:var(--line)}.chart .bar{fill:var(--bar)}.chart .bar.up{fill:var(--bar-up)}
.chart .cum{fill:none;stroke:var(--ink);stroke-width:1.6}
.chart #ch-band{fill:var(--band)}.chart #ch-lab{fill:var(--accent);font-weight:500}
.cap{font-size:.9rem;color:var(--muted);line-height:1.45}
.photos{display:grid;grid-template-columns:repeat(2,1fr);gap:18px;margin-top:14px}
.photos figure{margin:0}
.dec{display:grid;grid-template-columns:repeat(auto-fill,minmax(8.5rem,1fr));gap:6px 18px;margin:14px 0;padding:0;list-style:none;font-size:.98rem}
.dec li{display:flex;justify-content:space-between;border-bottom:1px solid var(--line-soft);padding:3px 0}
.dec b{font:500 .9rem 'IBM Plex Mono',monospace}
.sources{padding-bottom:80px}
.sources ol{padding-left:1.2em;font-size:.95rem}.sources li{margin:0 0 .5em}
.foot{font:500 .78rem/1.4 'IBM Plex Mono',monospace;color:var(--muted);margin-top:30px}

/* rail */
.rail{position:fixed;right:10px;top:50%;translate:0 -50%;z-index:6;display:flex;flex-direction:column;gap:10px;opacity:0;transition:opacity .4s}
body.past-hero .rail{opacity:1}
.rail a{position:relative;display:block;width:10px;height:10px}
.rail a::before{content:'';position:absolute;inset:3px;border-radius:50%;background:var(--muted);opacity:.55}
.rail a[aria-current=true]::before{background:var(--accent);opacity:1;inset:2px}
.rail a span{position:absolute;right:16px;top:50%;translate:0 -50%;white-space:nowrap;font:500 .72rem/1 'IBM Plex Mono',monospace;background:var(--card);color:var(--ink);padding:4px 7px;border-radius:4px;opacity:0;pointer-events:none}
.rail a:hover span,.rail a:focus-visible span{opacity:1}
@media (max-width:1100px){.rail{display:none}}

body.past-story .dock,body.past-story .labs{opacity:0;pointer-events:none}
/* phones */
@media (max-width:760px){
  .stage{position:sticky;inset:auto;top:0;height:calc(var(--vh,1vh)*54);z-index:4}
  .story{z-index:2}
  .dock{bottom:10px;padding:8px 12px}
  .dock .row,.dock .ends{display:none}
  .dock .ctl{margin-top:0}
  .story{margin-top:0}
  .step{min-height:auto;padding:14px 12px 30vh;display:block}
  .step.melt{min-height:170vh}
  .step.melt>.card{position:sticky;top:calc(var(--vh,1vh)*54 + 12px)}
  .step.hero{min-height:auto;padding:18px 12px 30vh}
  .step>.card,.step.hero>.card{width:auto;padding:18px 18px}
  .step.hero>.card{padding:20px}
  .top nav{display:none}
  .photos{grid-template-columns:1fr}
  .stage canvas{touch-action:pan-y}
  .lab{font-size:.66rem}
    [data-anchor]{scroll-margin-top:calc(var(--vh,1vh)*54 + 96px)}
}
@media (prefers-reduced-motion:reduce){*{scroll-behavior:auto!important;transition:none!important}}
@media print{.stage,.dock,.top,.rail{display:none}.step>.card{width:auto;background:none;border:0}}

.rul{position:absolute;inset:0;pointer-events:none}
.rul i{position:absolute;left:0;top:0;width:0;border-left:2px solid #fff;display:block}
.rul i b{position:absolute;left:-6px;top:-1px;width:10px;border-top:2px solid #fff}
.rul i b:last-child{display:none}
.rul i::after{content:'';position:absolute;left:-6px;bottom:-1px;width:10px;border-top:2px solid #fff}
.rul i span{position:absolute;left:12px;top:0;white-space:nowrap;font:600 .78rem/1.2 'IBM Plex Mono',monospace;color:#fff;background:rgba(8,16,30,.78);padding:3px 7px;border-radius:3px;transform:translateY(-4px)}
#rul-par{border-left-color:#ffd9a0}#rul-par b,#rul-par::after{border-top-color:#ffd9a0}#rul-par span{color:#ffd9a0}
#rul-ice span{left:auto;right:12px;text-align:right}

.chip.all{border-style:dashed;color:var(--accent)}
#stamp{position:absolute;right:max(5vw,24px);bottom:18vh;z-index:2;font:600 clamp(1.6rem,4.2vw,3.2rem)/1 Fraunces,Georgia,serif;color:#fff;background:rgba(8,16,30,.5);padding:.12em .4em;border-radius:6px;text-shadow:0 2px 14px rgba(0,0,0,.65);pointer-events:none;text-align:right;transition:opacity .2s}
.rul i#rul-par{background:repeating-linear-gradient(0deg,rgba(255,217,160,.28) 0 2px,transparent 2px 9px),rgba(255,217,160,.14);border:2px solid #ffd9a0}
.rul i#rul-par b,.rul i#rul-par::after{display:none}
.rul i#rul-par span{left:54px}
@media (max-width:760px){#stamp{bottom:auto;top:56px;right:14px;font-size:1.5rem}}

.stage #poster{position:absolute;inset:0;width:100%;height:100%;object-fit:cover}
.stage.nogl canvas{display:none}

#stage-clear{position:absolute;left:50%;translate:-50% 0;top:58px;z-index:3;background:var(--card);backdrop-filter:blur(6px);-webkit-backdrop-filter:blur(6px)}
#lake-card .clr{float:right;margin:6px 0 0 8px}

[data-anchor]{scroll-margin-top:72px}