@font-face{font-family:Fraunces;font-weight:300;font-style:normal;font-display:swap;src:url("fonts/fraunces-latin-ext-300-normal.woff2") format("woff2"),url("fonts/fraunces-latin-300-normal.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-weight:300;font-style:normal;font-display:swap;src:url("fonts/fraunces-latin-300-normal.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:Fraunces;font-weight:400;font-style:normal;font-display:swap;src:url("fonts/fraunces-latin-ext-400-normal.woff2") format("woff2"),url("fonts/fraunces-latin-400-normal.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-weight:400;font-style:normal;font-display:swap;src:url("fonts/fraunces-latin-400-normal.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:Fraunces;font-weight:300;font-style:italic;font-display:swap;src:url("fonts/fraunces-latin-ext-300-italic.woff2") format("woff2");unicode-range:U+0100-02BA,U+1E00-1EFF}
@font-face{font-family:Fraunces;font-weight:300;font-style:italic;font-display:swap;src:url("fonts/fraunces-latin-300-italic.woff2") format("woff2");unicode-range:U+0000-00FF}
@font-face{font-family:"Plex Mono";font-weight:400;font-style:normal;font-display:swap;src:url("fonts/IBMPlexMono-Regular.woff2") format("woff2")}

:root{
  --bg:#f3eadf; --ink:#2a1c14; --muted:#5c4638; --line:rgba(42,28,20,.25);
  --card:rgba(255,248,240,.82); --card-ink:#2a1c14; --accent:#9a4e16;
  --bar:rgba(243,234,223,.92); --hud:rgba(255,248,240,.9);
  --focus:#7a3410; --lane:rgba(90,40,10,.28);
  color-scheme:light;
}
html[data-theme="dark"]{
  --bg:#140e0b; --ink:#f4eadf; --muted:#d9c7b4; --line:rgba(244,234,223,.28);
  --card:rgba(28,18,12,.72); --card-ink:#f6efe6; --accent:#e7a15a;
  --bar:rgba(18,12,9,.88); --hud:rgba(22,14,10,.8);
  --focus:#ffd9a8; --lane:rgba(255,220,180,.35);
  color-scheme:dark;
}
*{box-sizing:border-box}
html{scroll-behavior:smooth}
html.reduced{scroll-behavior:auto}
body{margin:0;background:#140e0b;color:#f4eadf;font-family:Fraunces,Georgia,serif;font-weight:300;font-size:1.2rem;line-height:1.45}
.skip{position:absolute;left:-999px;top:0;background:#fff;color:#000;padding:.4rem .7rem;z-index:9}
.skip:focus{left:.4rem}
.topbar{position:sticky;top:0;z-index:5;display:flex;align-items:center;gap:.7rem;height:46px;padding:0 .8rem;background:var(--bar);color:var(--ink);backdrop-filter:blur(10px);border-bottom:1px solid var(--line);font-family:"Plex Mono",ui-monospace,monospace;font-size:.78rem}
.topbar a{color:inherit;text-decoration:none}
.home{font-weight:400;white-space:nowrap}
.home,.chip,.icon-btn{flex:0 0 auto}
.topnav{display:flex;gap:.85rem;overflow-x:auto;scrollbar-width:none;white-space:nowrap;min-width:0;flex:1}
.topnav::-webkit-scrollbar{display:none}
.topnav a[aria-current="true"]{color:var(--accent)}
.spacer{display:none}
.chip{border:1px solid var(--line);border-radius:999px;padding:.15rem .55rem}
.icon-btn{width:32px;height:32px;border-radius:50%;border:1px solid var(--line);background:transparent;color:inherit;display:grid;place-items:center;padding:0}
.icon-btn svg{display:block}
.icon-btn svg[hidden]{display:none}
.stage{position:fixed;inset:0;z-index:0;background:
  radial-gradient(80% 50% at 20% 8%, rgba(255,196,120,.28), transparent 55%),
  linear-gradient(#1a100c, #0c0806 70%)}
html[data-theme="dark"] .stage{background:
  radial-gradient(80% 50% at 20% 8%, rgba(255,186,110,.35), transparent 55%),
  linear-gradient(#3a261c, #1a100c 72%)}
.stage canvas{width:100%;height:100%;display:block}
.rail{position:fixed;right:1.15rem;left:auto;top:50%;transform:translateY(-50%);z-index:4;display:flex;flex-direction:column;align-items:flex-end;gap:.55rem}
.rail a{position:relative;display:flex;align-items:center;justify-content:center;width:18px;height:18px;color:#f6efe6;text-decoration:none;font-family:"Plex Mono",monospace;font-size:.68rem}
.rail i{width:7px;height:7px;border-radius:50%;border:1px solid currentColor;display:block}
.rail a[aria-current="true"] i{background:currentColor}
.rail span{position:absolute;right:18px;top:50%;transform:translateY(-50%);opacity:0;white-space:nowrap;pointer-events:none;text-shadow:0 1px 8px rgba(12,8,6,.75)}
.rail a:hover span,.rail a:focus-visible span,.rail a[aria-current="true"] span{opacity:1}
main{position:relative;z-index:3;pointer-events:none;padding:8vh 6vw calc(34vh + env(safe-area-inset-bottom))}
.hero{max-width:18em;padding-top:6vh}
.kicker{font-family:"Plex Mono",monospace;letter-spacing:.08em;text-transform:uppercase;font-size:.78rem;color:var(--accent);margin:0 0 .6rem}
h1{font-weight:300;font-size:clamp(2.7rem,8vw,6.4rem);line-height:.95;letter-spacing:-.03em;margin:0 0 .7rem;text-shadow:0 2px 18px rgba(12,8,6,.55)}
.deck,.kicker,h2{text-shadow:0 1px 12px rgba(12,8,6,.45)}
.deck{font-size:clamp(1.2rem,2vw,1.55rem);max-width:28em;margin:0 0 1rem}
.go{display:flex;flex-wrap:wrap;gap:.6rem;margin:.4rem 0}
.btn{font:inherit;font-size:1rem;border-radius:999px;border:1px solid rgba(246,239,230,.45);background:transparent;color:#f6efe6;padding:.55rem 1rem;cursor:pointer}
.btn.primary{background:var(--accent);color:#fff8f0;border-color:transparent}
html[data-theme="dark"] .btn.primary{color:#1a100c}
.fine{font-size:.95rem;color:#e7d7c6;max-width:36em}
.scroll-cue{font-family:"Plex Mono",monospace;animation:bob 1.8s ease-in-out infinite}
html.reduced .scroll-cue{animation:none}
@keyframes bob{50%{transform:translateY(4px)}}
section{scroll-margin-top:58px}
.chapter{max-width:40rem;margin:18vh 0}
h2{font-weight:300;font-size:clamp(1.8rem,4vw,2.8rem);line-height:1.1;margin:0 0 .8rem}
h2 a{color:inherit;text-decoration:none}
.step{margin:0 0 12vh}
.hero,.card,.panel,h2,.method,.srcs,.block{pointer-events:auto}
.card,.panel{background:var(--card);color:var(--card-ink);border:1px solid var(--line);border-radius:18px;padding:1.1rem 1.2rem 1.15rem;backdrop-filter:blur(8px);max-width:38rem}
.card p,.panel p{margin:.55rem 0}
.card p:first-child{margin-top:0}
.wk{font-family:"Plex Mono",monospace;font-size:.78rem;letter-spacing:.06em;text-transform:uppercase;color:var(--accent)}
.step{opacity:.45;transform:translateY(8px);transition:opacity .4s ease}
.step.on{opacity:1;transform:none}
html.reduced .step{opacity:1;transform:none;transition:none}
.lab-row{display:flex;flex-wrap:wrap;gap:.45rem;margin:.7rem 0}
.seg{font:inherit;font-size:.95rem;border-radius:999px;border:1px solid var(--line);background:transparent;color:inherit;padding:.4rem .75rem;cursor:pointer}
.seg[aria-pressed="true"]{background:var(--accent);color:#fff8f0;border-color:transparent}
html[data-theme="dark"] .seg[aria-pressed="true"],
html[data-theme="dark"] .hud button[aria-pressed="true"]{color:#1a100c}
.curve{margin:1rem 0 0}
.curve svg{width:100%;height:auto;color:var(--card-ink)}
.tk,.ax{font-family:"Plex Mono",monospace;font-size:11px;fill:currentColor}
.gr{stroke:currentColor;stroke-opacity:.2}
.ln{fill:none;stroke:currentColor;stroke-width:2}
.m{fill:currentColor}
#you{fill:var(--accent);stroke:#1a100c;stroke-width:1.5}
.lane{position:fixed;left:0;right:0;bottom:calc(3.1rem + env(safe-area-inset-bottom));height:16vh;min-height:72px;z-index:2;border:0;background:transparent;touch-action:pan-y;pointer-events:none}
.lane.live{pointer-events:auto}
.lane.drawing{touch-action:none}
.lane span{position:absolute;left:50%;bottom:.15rem;transform:translateX(-50%);font-family:"Plex Mono",monospace;font-size:.7rem;letter-spacing:.04em;opacity:0;pointer-events:none;text-shadow:0 1px 6px rgba(0,0,0,.6);white-space:nowrap}
.lane.live span{opacity:.75}
.hud{position:fixed;left:auto;right:.5rem;bottom:calc(.45rem + env(safe-area-inset-bottom));z-index:6;display:flex;gap:.25rem;align-items:center;width:max-content;max-width:calc(100vw - 1rem);background:var(--hud);color:var(--card-ink);border:1px solid var(--line);border-radius:999px;padding:.2rem .3rem .2rem .7rem;backdrop-filter:blur(8px);font-family:"Plex Mono",monospace;font-size:.72rem;overflow-x:auto}
.hud button,.hud span{white-space:nowrap}
.hud button{font:inherit;font-size:.75rem;border:0;background:transparent;color:inherit;border-radius:999px;padding:.35rem .55rem;cursor:pointer}
.hud button[aria-pressed="true"]{background:var(--accent);color:#fff8f0}
.coda{font-size:clamp(1.35rem,2.4vw,1.8rem);line-height:1.3}
.method{font-size:1.02rem}
.srcs{padding-left:1.1rem;font-size:.95rem}
.srcs a{color:inherit}
.foot{position:relative;z-index:1;padding:2rem 6vw 6rem;font-family:"Plex Mono",monospace;font-size:.78rem;color:#f4eadf}
.foot a{color:inherit}
:focus-visible{outline:2px solid var(--focus);outline-offset:3px}
.sr{position:absolute;width:1px;height:1px;padding:0;margin:-1px;overflow:hidden;clip:rect(0,0,0,0);white-space:nowrap;border:0}
.cal-line{display:block;height:12px;width:200px;max-width:100%;background:currentColor;border-radius:2px;margin:.35rem 0}
.cal input[type=range]{width:100%;margin:.15rem 0 .45rem;accent-color:var(--accent)}
.cal-note{font-family:"Plex Mono",ui-monospace,monospace;font-size:.78rem}
@media(max-width:800px){
  .rail{display:none}
  main{padding:4vh 5vw calc(42vh + env(safe-area-inset-bottom))}
  h1{font-size:clamp(2.5rem,12vw,3.6rem)}
  .lane{height:14vh}
  .hud{font-size:.68rem}
}
@media(max-width:360px){
  .topbar{padding:0 .45rem;gap:.4rem}
  .chip{padding:.1rem .4rem}
  .deck{font-size:1.05rem}
}
@media(prefers-reduced-motion:reduce){
  .scroll-cue{animation:none}
  .step{opacity:1;transform:none}
}
noscript .step{opacity:1}