@font-face{font-family:"Fraunces";font-style:normal;font-weight:100 900;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:100 900;font-display:swap;src:url(fonts/fraunces-normal-latin-ext.woff2) format("woff2");unicode-range:U+0100-02BA,U+02BD-02C5,U+02C7-02CC,U+02CE-02D7,U+02DD-02FF,U+0304,U+0308,U+0329,U+1D00-1DBF,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:"Fraunces";font-style:italic;font-weight:100 900;font-display:swap;src:url(fonts/fraunces-italic-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:italic;font-weight:100 900;font-display:swap;src:url(fonts/fraunces-italic-latin-ext.woff2) format("woff2");unicode-range:U+0100-02BA,U+02BD-02C5,U+02C7-02CC,U+02CE-02D7,U+02DD-02FF,U+0304,U+0308,U+0329,U+1D00-1DBF,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-style:normal;font-weight:400;font-display:swap;src:url(fonts/IBMPlexMono-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+2074,U+20AC,U+2122,U+2191,U+2193,U+2212,U+2215,U+FEFF,U+FFFD}
@font-face{font-family:"Plex Mono";font-style:normal;font-weight:400;font-display:swap;src:url(fonts/IBMPlexMono-400-latin-ext.woff2) format("woff2");unicode-range:U+0100-02BA,U+02BD-02C5,U+02C7-02CC,U+02CE-02D7,U+02DD-02FF,U+0304,U+0308,U+0329,U+1D00-1DBF,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-style:normal;font-weight:600;font-display:swap;src:url(fonts/IBMPlexMono-600-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:"Plex Mono";font-style:normal;font-weight:600;font-display:swap;src:url(fonts/IBMPlexMono-600-latin-ext.woff2) format("woff2");unicode-range:U+0100-02BA,U+02BD-02C5,U+02C7-02CC,U+02CE-02D7,U+02DD-02FF,U+0304,U+0308,U+0329,U+1D00-1DBF,U+1E00-1E9F,U+1EF2-1EFF,U+2020,U+20A0-20AB,U+20AD-20C0,U+2113,U+2C60-2C7F,U+A720-A7FF}


:root{
  --bg:#eef2ef;--bg2:#e1e8e4;--card:#fafcfb;--ink:#0d2229;--ink2:#2a4249;--muted:#324a50;
  --line:#8da3a3;--line-soft:#c3d1d0;--accent:#6f2c08;--accent-ink:#ffffff;--cool:#1e5566;
  --serif:"Fraunces",Georgia,"Times New Roman",serif;--mono:"Plex Mono",ui-monospace,Menlo,monospace;
  --bar:3rem;color-scheme:light
}
@media (prefers-color-scheme:dark){:root:not([data-theme="light"]){
  --bg:#06161b;--bg2:#0a2027;--card:#0d2a32;--ink:#e8efec;--ink2:#c3d2d0;--muted:#a3b8b6;
  --line:#33606c;--line-soft:#1d3c45;--accent:#ffc26b;--accent-ink:#1a1002;--cool:#8fd0e6;color-scheme:dark}}
:root[data-theme="dark"]{
  --bg:#06161b;--bg2:#0a2027;--card:#0d2a32;--ink:#e8efec;--ink2:#c3d2d0;--muted:#a3b8b6;
  --line:#33606c;--line-soft:#1d3c45;--accent:#ffc26b;--accent-ink:#1a1002;--cool:#8fd0e6;color-scheme:dark}

*{box-sizing:border-box}
[hidden]{display:none!important}
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 1.1rem/1.62 var(--serif);font-optical-sizing:auto;text-rendering:optimizeLegibility;overflow-x:hidden}
a{color:var(--accent);text-underline-offset:.16em;text-decoration-thickness:1px}
a:hover{text-decoration-thickness:2px}
:focus-visible{outline:3px solid var(--accent);outline-offset:2px;border-radius:4px}
.skip{position:absolute;left:-999px;top:0;background:var(--card);padding:.5rem 1rem;z-index:80}
.skip:focus{left:8px;top:8px}
.vh{position:absolute;width:1px;height:1px;overflow:hidden;clip:rect(0 0 0 0);white-space:nowrap}
section{scroll-margin-top:calc(var(--bar) + 8px)}
h1,h2,h3{font-family:var(--serif);line-height:1.1;margin:0;text-wrap:balance;font-optical-sizing:auto}
button,select,input{font:inherit}
p{margin:0 0 1em}
.wrap{max-width:46rem;margin:0 auto;padding:0 max(16px,env(safe-area-inset-left))}
.wide{max-width:72rem}

/* top bar */
.topbar{position:sticky;top:0;z-index:50;height:var(--bar);display:flex;align-items:center;gap:.7rem;padding:0 max(16px,env(safe-area-inset-left));
  background:color-mix(in srgb,var(--bg) 98%,transparent);border-bottom:1px solid var(--line-soft);font:500 .86rem/1 var(--mono)}
.home{display:inline-flex;align-items:center;gap:.45rem;color:var(--ink);text-decoration:none;white-space:nowrap;font-weight:600}
.home-ico{color:var(--accent)}
.topnav{display:flex;gap:1rem;overflow-x:auto;scrollbar-width:none;min-width:0;flex:0 1 auto;margin-left:.6rem}
.topnav::-webkit-scrollbar{display:none}
.topnav a{color:var(--ink2);text-decoration:none;white-space:nowrap;padding:.95rem .1rem}
.topnav a:hover{color:var(--accent)}
.spacer{flex:1}
.chip{display:inline-flex;align-items:center;min-height:32px;padding:0 .7rem;border:1px solid var(--line);border-radius:999px;color:var(--ink);text-decoration:none;font-weight:600}
.icon-btn{width:34px;height:34px;display:inline-grid;place-items:center;border:1px solid var(--line);border-radius:999px;background:transparent;color:var(--ink);cursor:pointer}
.progress{position:absolute;left:0;right:0;bottom:-1px;height:2px;pointer-events:none}
.progress span{display:block;height:100%;width:100%;transform-origin:left;transform:scaleX(0);background:var(--accent)}
.progress i{position:absolute;top:-9px;left:0;width:16px;height:16px;margin-left:-8px;will-change:transform;color:var(--accent)}
.progress i svg{display:block}
@media (max-width:900px){.topnav{display:none}}
@media (pointer:coarse){.chip,.icon-btn{min-height:44px;min-width:44px}.icon-btn{width:44px;height:44px}}

/* hero: a drawn dusk scene, dark in both themes */
.hero{position:relative;min-height:calc(100svh - var(--bar));display:flex;align-items:flex-end;overflow:hidden;background:linear-gradient(180deg,#030d14 0%,#0a2330 50%,#7a4a35 88%,#2b1a1a 100%);color:#f4f1e8;isolation:isolate}
#hero-cv{position:absolute;inset:0;width:100%;height:100%;display:block;z-index:-2;touch-action:pan-y}
.hero::after{content:"";position:absolute;inset:0;z-index:-1;pointer-events:none;background:
  linear-gradient(180deg,rgba(3,12,18,0) 0%,rgba(3,12,18,0) 42%,rgba(3,12,18,.5) 72%,rgba(3,12,18,.82) 100%),
  linear-gradient(90deg,rgba(3,12,18,.84) 0%,rgba(3,12,18,.55) 36%,rgba(3,12,18,0) 62%)}
.hero-in{width:100%;max-width:72rem;margin:0 auto;padding:0 max(16px,env(safe-area-inset-left)) clamp(1.2rem,4vh,2.6rem);pointer-events:none}
.hero-in a,.hero-in button{pointer-events:auto}
.kicker{display:inline-block;font:600 .78rem/1.3 var(--mono);letter-spacing:.12em;text-transform:uppercase;color:#ffe3a8;background:rgba(3,12,18,.78);padding:.3rem .6rem;border-radius:6px;margin:0 0 1rem}
h1{font-weight:300;font-size:clamp(2.1rem,6.4vw,4.9rem);letter-spacing:-.02em;line-height:1.02;max-width:15ch;font-variation-settings:"opsz" 144;text-shadow:0 2px 22px rgba(0,5,12,.6)}
.hero h1{max-width:min(16ch,100%)}
.deck{font-size:clamp(1.02rem,2vw,1.34rem);line-height:1.42;max-width:35rem;margin:1.1rem 0 0;color:#eeeadc;font-weight:350;text-shadow:0 1px 14px rgba(0,5,12,.8)}
.cue-row{display:flex;flex-wrap:wrap;align-items:center;gap:.7rem 1rem;margin-top:1.4rem}
.cue-btn{display:inline-flex;align-items:center;gap:.6rem;min-height:48px;padding:.5rem 1.3rem;border-radius:999px;background:#ffc26b;color:#1a1002;font:600 .95rem/1 var(--mono);text-decoration:none;letter-spacing:.02em}
.cue-btn:hover{background:#ffd48f}
.mv-btn{min-height:44px;padding:.4rem 1rem;border:1px solid rgba(244,241,232,.6);border-radius:999px;background:rgba(3,12,18,.55);color:#f4f1e8;font:600 .8rem/1 var(--mono);cursor:pointer}
.mv-btn.flat{display:block;margin:.8rem 0 0;border-color:var(--line);background:transparent;color:var(--ink)}
.hero-tag{margin:1rem 0 0;font:500 .74rem/1.4 var(--mono);color:#dfe8e6;max-width:30rem}
.hero .share-row{--ink:#f4f1e8;--line:rgba(244,241,232,.55);--accent:#ffd48a;margin-left:.2rem}
@media (max-width:700px){
  .hero{display:block;min-height:0;background:#030d14}
  #hero-cv{position:relative;inset:auto;height:54svh;min-height:300px;z-index:0}
  .hero::after{display:none}
  .hero-in{padding-top:.8rem;padding-bottom:1.4rem}
  .hero .share-label{display:none}.deck{font-size:1.02rem}
  h1{font-size:2.15rem}
}

/* share */
.share-row{display:flex;flex-wrap:wrap;align-items:center;gap:.5rem}
.share-label{font:500 .78rem/1 var(--mono);color:inherit;opacity:.9;margin-right:.3rem}
.sh{width:40px;height:40px;display:inline-grid;place-items:center;border:1px solid var(--line-soft);border-radius:999px;background:transparent;color:var(--ink);cursor:pointer;text-decoration:none}
.hero .sh{border-color:rgba(244,241,232,.55);color:#f4f1e8}
.sh:hover{border-color:var(--accent);color:var(--accent)}
@media (pointer:coarse){.sh{width:44px;height:44px}}
.copied{margin:0;font:500 .8rem/1 var(--mono);min-height:1em;flex-basis:100%}
.hero .copied{color:#ffe3a8}

/* bands */
.band{padding:clamp(3rem,8vh,5.5rem) 0}
.band.alt{background:var(--bg2)}
.band p{max-width:42rem}
h2{font-weight:350;font-size:clamp(1.7rem,4.2vw,3rem);letter-spacing:-.015em;margin-bottom:.9rem}
.lead{font-size:1.18rem;color:var(--ink2)}
.ev-h{font-weight:400;font-size:1.4rem;margin:2rem 0 .8rem}

/* take-off steps */
.go-steps{list-style:none;margin:1.6rem 0 0;padding:0;display:grid;grid-template-columns:repeat(4,minmax(0,1fr));gap:1rem;counter-reset:s}
.go-step{counter-increment:s;background:var(--card);border:1px solid var(--line-soft);border-radius:14px;overflow:hidden;padding:0 0 1rem}
.go-step .pose{display:block;width:100%;aspect-ratio:4/3;background:#06161b}
.go-step h3{font-weight:450;font-size:1.2rem;margin:.9rem 1rem .35rem}
.go-step h3::before{content:counter(s) ". ";font-family:var(--mono);font-weight:600;color:var(--accent)}
.go-step p{font-size:.98rem;margin:0 1rem;color:var(--ink2)}
@media (max-width:1000px){.go-steps{grid-template-columns:repeat(2,minmax(0,1fr))}}
@media (max-width:560px){.go-steps{grid-template-columns:1fr}}

/* the toy */
.lab-grid{display:grid;grid-template-columns:minmax(0,1.5fr) minmax(0,1fr);gap:1.4rem;margin-top:1.4rem;align-items:start}
.lab-stage{position:sticky;top:calc(var(--bar) + 10px);border-radius:14px;overflow:hidden;border:1px solid var(--line-soft);background:#06161b;aspect-ratio:4/3;max-height:calc(100svh - var(--bar) - 24px)}
#lab-cv{display:block;width:100%;height:100%}
.lab-ctl{background:var(--card);border:1px solid var(--line-soft);border-radius:14px;padding:1rem 1.1rem}
.ctl-row{margin:0 0 1rem;padding:0;border:0;min-width:0}
.ctl-row label,.ctl-row legend{display:flex;justify-content:space-between;gap:.6rem;font:600 .86rem/1.3 var(--mono);color:var(--ink);padding:0;margin-bottom:.35rem}
.ctl-row output{color:var(--accent);font-weight:600}
input[type=range]{width:100%;accent-color:var(--accent);min-height:32px}
.note{font:500 .8rem/1.4 var(--mono);color:var(--muted);margin:.2rem 0 0;max-width:none!important}
.chk{align-items:center;cursor:pointer;justify-content:flex-start!important}
.chk input,.rad input{width:20px;height:20px;accent-color:var(--accent);margin:0 .5rem 0 0;flex:none}
.rad{display:flex;align-items:center;justify-content:flex-start!important;font:500 .9rem/1.3 var(--mono)!important;margin:.15rem 0!important;cursor:pointer;min-height:36px}
.go-btn{width:100%;min-height:48px;border:0;border-radius:999px;background:var(--accent);color:var(--accent-ink);font:600 .95rem/1 var(--mono);cursor:pointer}
.go-btn:hover{filter:brightness(1.08)}
.res{margin-top:1rem;font-size:1rem;line-height:1.45;color:var(--ink);min-height:6.5rem}
.res p{margin:0 0 .6em;max-width:none}
.res .done{font:600 .86rem/1.3 var(--mono);color:var(--accent)}
@media (max-width:900px){.lab-grid{grid-template-columns:minmax(0,1fr)}.lab-stage{position:sticky;top:var(--bar);z-index:5;aspect-ratio:auto;height:min(46svh,22rem);border-radius:0 0 14px 14px}}
.ev{display:grid;grid-template-columns:repeat(3,minmax(0,1fr));gap:1rem}
@media (max-width:900px){.ev{grid-template-columns:1fr}}
.card{background:var(--card);border:1px solid var(--line-soft);border-radius:12px;padding:1.1rem 1.2rem}
.card h3{font-weight:450;font-size:1.3rem;margin-bottom:.4rem}
.card p{font-size:1rem;margin:0 0 .7em}
.card p:last-child{margin:0}
.badge{display:inline-block;font:600 .72rem/1.3 var(--mono)!important;letter-spacing:.06em;text-transform:uppercase;color:var(--cool);margin:0 0 .35rem!important}
.three{display:grid;grid-template-columns:repeat(3,minmax(0,1fr));gap:1rem}
@media (max-width:900px){.three{grid-template-columns:1fr}}

/* quotes */
.q{margin:1.2rem 0;padding:.2rem 0 .2rem 1.1rem;border-left:4px solid var(--accent);font-size:1.18rem;font-style:italic;color:var(--ink)}
.q p{margin:0 0 .6em}
.orig{font-style:normal;font-size:.92rem;color:var(--ink2)}
.orig summary{cursor:pointer;font:600 .78rem/1.4 var(--mono);color:var(--accent);padding:.3rem 0}
.orig p{font-style:italic;margin-top:.4rem}
.rail-note{font-size:.95rem;color:var(--ink2)}

/* ruler */
.chart{margin:1.6rem auto;max-width:46rem}
.chart svg{width:100%;height:auto;display:block;overflow:visible}
.chart text{fill:var(--ink2);font:500 12.5px var(--mono)}
.chart .ax-t{fill:var(--ink);font-weight:600}
.chart .gl{stroke:var(--line-soft);stroke-width:1}
.chart .peak{fill:var(--line);opacity:.7}
.chart .mk{stroke:var(--accent);stroke-width:1.4;stroke-dasharray:3 4}
.chart .mk-dot{fill:var(--accent)}
.chart .silk{fill:none;stroke:var(--cool);stroke-width:1.6}
.chart .sp{fill:var(--accent)}

/* figures */
.fig{margin:1.6rem 0}
.fig img{display:block;width:100%;height:auto;border-radius:10px;border:1px solid var(--line-soft)}
.fig figcaption{font:500 .8rem/1.4 var(--mono);color:var(--ink2);margin-top:.5rem}
.fig figcaption a{color:var(--accent)}
.fig.small{max-width:30rem;margin:1.6rem auto 0}
.fig.wide{max-width:50rem;margin:1.6rem auto}
.band>.wide>.fig.small{margin-left:0}
.figs{display:grid;grid-template-columns:repeat(2,minmax(0,1fr));gap:1rem;max-width:72rem;margin:1.6rem auto;padding:0 max(16px,env(safe-area-inset-left))}
.figs .fig{margin:0}
@media (max-width:700px){.figs{grid-template-columns:1fr}}
ul.plain,ol.plain{padding-left:1.2rem;max-width:42rem}
.plain li{margin:.5em 0}
.end{font-size:clamp(1.3rem,3vw,1.9rem);font-weight:300;line-height:1.3;max-width:34rem;margin:2rem 0 0}
.src li{margin:.4em 0;font-size:.95rem}
.src{max-width:50rem;padding-left:1.1rem}
.foot{padding:2rem max(16px,env(safe-area-inset-left)) 3rem;border-top:1px solid var(--line-soft);font:500 .85rem/1.5 var(--mono);color:var(--ink2);text-align:center}
.foot a{color:var(--ink)}
@media (prefers-reduced-motion:reduce){*{transition:none!important;animation:none!important}}

/* the round back-to-top button would cover the controls while the sticky stage fills a phone */
@media (max-width:900px){body.in-stage .to-top-x{display:none!important}}