/* Fork in the Road — a Busytown cutaway of a town square, sibling of Inference Kitchen and Policy Pond.
   Flat gouache on paper, warm-brown outlines, hand-lettered signs, every object labelled. */
:root{
  --paper:#FBF7EC; --sheet:#FFFDF6; --ink:#3A2418; --line:#4A2E1E; --soft:#6E5040; --rule:#E7DCC4;
  --yellow:#F4C430; --brick:#C8452F; --grass:#5FA03C; --sky:#9CCBEA; --sand:#DDBB8A; --lilac:#B8A3DC; --steel:#B9BDC2; --wood:#B8793F;
  /* darker partners for text/lines on paper (≥4.5:1) */
  --brick-d:#A5321F; --grass-d:#3B7422; --sky-d:#246A9C; --yellow-d:#8A6300; --lilac-d:#5E4A94;
  /* the square */
  --cobble:#EAD9B6; --fog:#EEF3F6; --fog-d:#DCE6ED; --left:#246A9C; --right:#D9771E; --cartred:#A5321F;
  --sign:'Grandstander','Patrick Hand',system-ui,sans-serif;
  --hand:'Patrick Hand','Kalam',system-ui,sans-serif;
  --body:'Andika',system-ui,-apple-system,'Segoe UI',sans-serif;
  --stroke:2.5px solid var(--line);
  --lift:3px 4px 0 rgba(74,46,30,.16);
}
*{box-sizing:border-box;margin:0;padding:0}
html{-webkit-text-size-adjust:100%}
body{background:var(--paper);color:var(--ink);font:16px/1.6 var(--body);padding-bottom:68px;overflow-x:hidden;
  background-image:url("data:image/svg+xml,%3Csvg xmlns='http://www.w3.org/2000/svg' width='240' height='240'%3E%3Cfilter id='n'%3E%3CfeTurbulence type='fractalNoise' baseFrequency='.85' numOctaves='3' stitchTiles='stitch'/%3E%3CfeColorMatrix values='0 0 0 0 .29 0 0 0 0 .18 0 0 0 0 .12 0 0 0 .12 0'/%3E%3C/filter%3E%3Crect width='100%25' height='100%25' filter='url(%23n)'/%3E%3C/svg%3E");background-size:240px 240px}
a{color:var(--sky-d);text-underline-offset:3px}
.wrap{max-width:1080px;margin:0 auto;padding:18px 16px}

/* ---------- masthead: a painted highway guide sign ---------- */
header{display:grid;grid-template-columns:auto 1fr;gap:20px;align-items:center;padding:10px 0 18px}
.mast{display:inline-block;background:var(--grass-d);color:var(--paper);border:var(--stroke);border-radius:10px;padding:6px 18px 8px;box-shadow:var(--lift);transform:rotate(-1.5deg)}
.mast b{display:block;font:800 42px/1.05 var(--sign);letter-spacing:.01em;text-shadow:2px 2px 0 #22481A}
.mast span{display:block;font:400 17px/1.2 var(--hand);color:#DDF0CF;margin-top:2px}
.mast .mi{display:inline-block;width:38px;height:38px;vertical-align:-7px;margin-right:6px}
.mast .mi svg{width:100%;height:100%;display:block}
h1{font:800 29px/1.15 var(--sign);color:var(--ink);text-wrap:balance}
.sub{color:var(--soft);font-size:15.5px;margin-top:6px;max-width:640px}
@media(max-width:720px){header{grid-template-columns:1fr}.mast b{font-size:36px}h1{font-size:24px}}

/* ---------- nav: painted street signs ---------- */
nav{display:flex;gap:6px;flex-wrap:wrap;margin:6px 0 20px;padding-bottom:14px;border-bottom:3px dashed var(--rule)}
nav button{--c:var(--yellow);background:var(--sheet);border:var(--stroke);border-radius:8px;color:var(--ink);padding:10px 8px 6px;cursor:pointer;font:400 16px/1.15 var(--hand);box-shadow:inset 0 6px 0 var(--c),var(--lift);transition:transform .15s cubic-bezier(.2,.8,.2,1)}
nav button:hover{transform:translateY(-2px)}
nav button.on{background:var(--c);transform:translateY(-3px) rotate(-1deg)}
nav button .ic{display:inline-block;width:20px;height:20px;vertical-align:-4px;margin-right:4px}
nav button .ic svg,.kmap .k svg{width:100%;height:100%;display:block}
nav button .chk{color:var(--grass-d);margin-left:4px;font-weight:700}
nav button:nth-child(1){--c:var(--yellow)}nav button:nth-child(2){--c:#D9E4EC}nav button:nth-child(3){--c:#9BCB7E}nav button:nth-child(4){--c:var(--sky)}
nav button:nth-child(5){--c:var(--lilac)}nav button:nth-child(6){--c:var(--sand)}nav button:nth-child(7){--c:#F2A88F}nav button:nth-child(8){--c:#B7DD9C}nav button:nth-child(9){--c:#E5C9F2}
nav button:focus-visible{outline:3px solid var(--sky-d);outline-offset:2px}

section{display:none}
section.on{display:block;animation:rise .35s cubic-bezier(.16,1,.3,1)}
@keyframes rise{from{opacity:.001;transform:translateY(8px)}to{opacity:1;transform:none}}

/* ---------- the illustrated scene ---------- */
.scene{position:relative;background:#E5F2FA;border:var(--stroke);border-radius:12px;overflow:hidden;margin:0 0 16px;box-shadow:var(--lift);min-height:60px}
.scene svg{display:block;width:100%;height:auto;filter:url(#gouache)}
.scene::after{content:"";position:absolute;inset:0;pointer-events:none;background:url("data:image/svg+xml,%3Csvg xmlns='http://www.w3.org/2000/svg' width='600' height='300'%3E%3Cfilter id='m'%3E%3CfeTurbulence type='fractalNoise' baseFrequency='.018 .035' numOctaves='4' seed='7' stitchTiles='stitch'/%3E%3CfeColorMatrix values='0 0 0 0 .35 0 0 0 0 .22 0 0 0 0 .12 0 0 0 .9 -.28'/%3E%3C/filter%3E%3Crect width='100%25' height='100%25' filter='url(%23m)'/%3E%3C/svg%3E"),url("data:image/svg+xml,%3Csvg xmlns='http://www.w3.org/2000/svg' width='240' height='240'%3E%3Cfilter id='n'%3E%3CfeTurbulence type='fractalNoise' baseFrequency='.85' numOctaves='3' stitchTiles='stitch'/%3E%3CfeColorMatrix values='0 0 0 0 .29 0 0 0 0 .18 0 0 0 0 .12 0 0 0 .5 0'/%3E%3C/filter%3E%3Crect width='100%25' height='100%25' filter='url(%23n)'/%3E%3C/svg%3E");background-size:600px 300px,240px 240px;mix-blend-mode:multiply;opacity:.34}
.scene:empty{display:none}

/* ---------- panels ---------- */
.card{background:var(--sheet);border:var(--stroke);border-radius:12px;padding:20px 20px 16px;margin-bottom:18px;box-shadow:var(--lift)}
.card h2{font:800 29px/1.15 var(--sign);color:var(--ink);margin-bottom:8px;text-wrap:balance}
.card h3{font:400 22px/1.2 var(--hand);color:var(--brick-d);margin:18px 0 8px}
.card h3:first-child{margin-top:0}
.lede{font-size:16px;max-width:70ch}
.covers{display:inline-block;margin-top:12px;font:400 15px/1.35 var(--hand);color:var(--soft);background:var(--paper);border:1.5px dashed var(--soft);border-radius:6px;padding:3px 10px}
.covers b{color:var(--ink);font-weight:400;text-decoration:underline;text-decoration-color:var(--yellow);text-decoration-thickness:3px}
.grid{display:grid;gap:12px}
.g2{grid-template-columns:1fr 1fr}.g3{grid-template-columns:repeat(3,1fr)}.g4{grid-template-columns:repeat(4,1fr)}
@media(max-width:760px){.g2,.g3{grid-template-columns:1fr}.g4{grid-template-columns:1fr 1fr}}
.pg{display:grid;grid-template-columns:300px minmax(0,1fr);gap:18px;align-items:start}
@media(max-width:840px){.pg{grid-template-columns:minmax(0,1fr)}}
.panel{background:#FFF6DC;border:2px solid var(--line);border-radius:10px;padding:14px;margin-bottom:12px;min-width:0}
.panel h3{margin-top:0}

/* readouts: price tags hung on a nail */
.stat{position:relative;background:var(--sheet);border:2px solid var(--line);border-radius:8px;padding:22px 8px 9px;text-align:center;min-width:0}
.stat::before{content:"";position:absolute;top:5px;left:50%;width:8px;height:8px;margin-left:-4px;border-radius:50%;background:var(--paper);border:2px solid var(--line)}
.stat .v{font:800 23px/1.15 var(--sign);font-variant-numeric:tabular-nums;overflow-wrap:anywhere;color:var(--ink)}
.stat .l{font:400 14.5px/1.2 var(--hand);color:var(--soft);margin-top:2px}
.stat.big .v{font-size:30px}
.v.good{color:var(--grass-d)}.v.warn{color:var(--yellow-d)}.v.bad{color:var(--brick-d)}.v.gold{color:#8A5A12}.v.acc{color:var(--sky-d)}.v.left{color:var(--left)}.v.right{color:#A85A12}

/* ---------- controls ---------- */
.lbl{font:400 16px/1.3 var(--hand);color:var(--soft);margin-top:6px}
.sl{margin:10px 0}
.sl-h{display:flex;justify-content:space-between;gap:8px;font:400 16px/1.3 var(--hand);color:var(--soft);margin-bottom:4px}
.sl-h b{color:var(--ink);font:700 16px var(--sign);text-align:right}
input[type=range]{-webkit-appearance:none;appearance:none;width:100%;height:10px;background:var(--sand);border:2px solid var(--line);border-radius:6px;outline:none;cursor:pointer}
input[type=range]::-webkit-slider-thumb{-webkit-appearance:none;width:24px;height:24px;border-radius:50%;background:var(--yellow);border:2.5px solid var(--line);box-shadow:1px 2px 0 var(--line)}
input[type=range]::-moz-range-thumb{width:20px;height:20px;border-radius:50%;background:var(--yellow);border:2.5px solid var(--line)}
input[type=range]:focus-visible::-webkit-slider-thumb{box-shadow:0 0 0 4px rgba(36,106,156,.45)}
.seg{display:flex;gap:6px;flex-wrap:wrap;margin:6px 0 10px}
.seg button{background:var(--sheet);border:2px solid var(--line);color:var(--ink);padding:4px 10px 5px;border-radius:7px;cursor:pointer;font:400 16px/1.2 var(--hand);transition:transform .12s}
.seg button:hover{transform:translateY(-1px)}
.seg button.on{background:var(--sky);box-shadow:inset 0 -3px 0 rgba(74,46,30,.18)}
.seg button:disabled{opacity:.4;cursor:not-allowed;transform:none}
button:focus-visible{outline:3px solid var(--sky-d);outline-offset:2px}
.tg{display:flex;align-items:center;gap:10px;padding:5px 0;font-size:15px;cursor:pointer;user-select:none}
.tg input{position:absolute;opacity:0;width:1px;height:1px}
.tg .sw{width:40px;height:23px;border-radius:12px;background:var(--sand);border:2px solid var(--line);position:relative;flex:none;transition:background .15s}
.tg .sw::after{content:"";position:absolute;top:2px;left:2px;width:15px;height:15px;border-radius:50%;background:var(--sheet);border:2px solid var(--line);transition:transform .18s cubic-bezier(.2,.8,.2,1)}
.tg input:checked+.sw{background:var(--grass)}
.tg input:checked+.sw::after{transform:translateX(17px)}
.tg input:focus-visible+.sw{box-shadow:0 0 0 3px rgba(36,106,156,.45)}
.tg input:disabled+.sw{opacity:.5}
button.act{background:var(--yellow);color:var(--ink);border:2.5px solid var(--line);padding:8px 20px 9px;border-radius:9px;font:700 18px/1 var(--sign);cursor:pointer;box-shadow:2px 3px 0 var(--line);transition:transform .1s,box-shadow .1s}
button.act:hover{transform:translate(-1px,-1px);box-shadow:3px 4px 0 var(--line)}
button.act:active{transform:translate(2px,3px);box-shadow:0 0 0 var(--line)}
button.act:disabled{opacity:.55;cursor:default;transform:none;box-shadow:2px 3px 0 var(--line)}
button.ghost{background:var(--sheet);color:var(--ink);border:2px solid var(--line);padding:6px 13px 7px;border-radius:8px;font:400 16px/1.1 var(--hand);cursor:pointer;box-shadow:1px 2px 0 var(--line);transition:transform .1s,box-shadow .1s}
button.ghost:hover{background:#FFF1C6}
button.ghost:active{transform:translate(1px,2px);box-shadow:0 0 0 var(--line)}
button.ghost:disabled{opacity:.55;cursor:default}
.btnrow{display:flex;gap:8px;flex-wrap:wrap;margin:8px 0;align-items:center}
input[type=number],input[type=text],select{background:var(--sheet);border:2px solid var(--line);color:var(--ink);padding:7px 10px;border-radius:7px;font:16px var(--body);width:160px;max-width:100%}
input:focus,select:focus{outline:3px solid var(--sky-d);outline-offset:1px}

/* ---------- callouts: little signs pinned up ---------- */
.callout{border-radius:8px;padding:9px 12px 10px;margin-top:10px;font-size:15px;border:2px solid var(--line);background:var(--sheet)}
.co-i{background:#EAF4FB}.co-w{background:#FFF3CC}.co-r{background:#FBE3DC}.co-g{background:#E7F3DE}
.callout b{color:var(--ink)}

/* ---------- predict: a sticky note ---------- */
.predict{position:relative;background:#FFF1A8;border:2px solid var(--line);border-radius:4px;padding:16px 16px 14px;margin:20px 4px 14px;box-shadow:3px 4px 0 rgba(74,46,30,.2);transform:rotate(-.4deg)}
.predict::before{content:"";position:absolute;top:-10px;left:50%;width:80px;height:20px;margin-left:-40px;background:rgba(156,203,234,.75);border:1.5px solid rgba(74,46,30,.35);transform:rotate(2deg)}
.predict .tag{font:700 17px/1 var(--sign);color:var(--brick-d);margin-bottom:6px}
.predict .q{font-weight:700;font-size:16px;margin-bottom:10px}
.predict .opts{display:flex;gap:8px;flex-wrap:wrap}
.predict .opts button{background:var(--sheet);border:2px solid var(--line);color:var(--ink);padding:6px 13px 7px;border-radius:8px;cursor:pointer;font:400 16.5px/1.2 var(--hand);box-shadow:1px 2px 0 var(--line)}
.predict .opts button:hover:not(:disabled){background:#FFFBE6}
.predict .opts button.right{background:#BFE3A6}
.predict .opts button.wrong{background:#F4B7A7;text-decoration:line-through}
.predict .opts button:disabled{cursor:default}
.predict .why{display:none;margin-top:11px;font-size:15.5px;border-top:2px dashed rgba(74,46,30,.35);padding-top:10px}
.predict.done .why{display:block;animation:rise .3s cubic-bezier(.16,1,.3,1)}

/* ---------- say it out loud: a chalkboard ---------- */
.say{position:relative;border:6px solid var(--wood);border-radius:10px;padding:14px 18px;margin-top:20px;background:#2F4A3A;color:#E9F1E4;box-shadow:inset 0 0 0 2px var(--line),var(--lift)}
.say .tag{font:400 16px/1.2 var(--hand);color:#CFE2C4;margin-bottom:6px}
.say .line{font:700 21px/1.45 var(--sign);color:#FFFDF6}
.say:not(.open) .line{filter:blur(6px);user-select:none;pointer-events:none;opacity:.55}
.say.open .tag{color:var(--yellow)}

/* ---------- the cast: a menu board ---------- */
.kmap{display:grid;grid-template-columns:repeat(auto-fit,minmax(220px,1fr));gap:0 22px;margin-top:12px;background:#FFF6DC;border:2.5px solid var(--line);border-radius:10px;padding:10px 16px}
.kmap div{display:block;padding:7px 0;border-bottom:2px dotted rgba(74,46,30,.3);font:400 17px/1.3 var(--hand)}
.kmap .k{display:inline-block;width:26px;height:26px;vertical-align:-7px;margin-right:6px}
.kmap b{font:700 18px var(--sign);color:var(--brick-d)}
.kmap .t{display:block;color:var(--soft);font-size:15px;padding-left:32px}
.kmap br{display:none}

/* ---------- charts and the square ---------- */
canvas{display:block;width:100%;background:var(--sheet);border:2px solid var(--line);border-radius:8px}
canvas.sq{aspect-ratio:1/1;height:auto;background:var(--cobble)}
canvas.chart{aspect-ratio:2.2/1;height:auto}
.chartcap{font:400 15px/1.35 var(--hand);color:var(--soft);margin-top:6px}
.chartcap .sw{display:inline-block;width:12px;height:12px;border:1.5px solid var(--line);border-radius:2px;vertical-align:-1px;margin-right:4px}
.legend{display:flex;gap:14px;flex-wrap:wrap;font:400 15px var(--hand);color:var(--soft);margin-top:8px}
.legend .dot{display:inline-block;width:11px;height:11px;border-radius:50%;border:1.5px solid var(--line);vertical-align:-1px;margin-right:5px}

/* worked math: a chalk box */
.mathbox{background:#2F4A3A;color:#E9F1E4;border:5px solid var(--wood);border-radius:9px;padding:10px 12px;margin-top:10px;box-shadow:inset 0 0 0 2px var(--line)}
.mathbox .eq{font:700 17px/1.4 var(--sign);color:#FFFDF6}
.mathbox .eqn{font:400 16px/1.45 var(--hand);color:#CFE2C4;margin-top:6px}
.mathbox .eqn b{color:#FFE27A}
.mathbox .ok{color:#BFE3A6}.mathbox .bad{color:#F4B7A7}

/* the drive log (step 0) */
.logtab{margin-top:12px;max-height:220px;overflow:auto;border:2px solid var(--line);border-radius:8px;background:var(--sheet)}
.lr{display:grid;grid-template-columns:.6fr 1fr 1.2fr;gap:4px;padding:4px 10px;font:400 15.5px/1.3 var(--hand);border-bottom:1.5px dotted rgba(74,46,30,.25)}
.lr.h{background:#FFF6DC;color:var(--soft);position:sticky;top:0}
.lr.note{display:block;color:var(--soft)}
.lr i{font-style:normal}

/* the passes ladder (steps 3 and 4) */
.ladder{width:100%;border:2px solid var(--line);border-radius:8px;overflow:hidden;background:var(--sheet);border-collapse:separate;border-spacing:0;font:400 15.5px/1.3 var(--hand);margin-top:10px}
.ladder th,.ladder td{padding:5px 10px;text-align:right;border-bottom:1.5px dotted rgba(74,46,30,.25)}
.ladder th{background:#FFF6DC;color:var(--soft);font-weight:400}
.ladder td:first-child,.ladder th:first-child{text-align:left}
.ladder tr:last-child td{border-bottom:0}
.ladder .n{font:700 16px var(--sign)}
.ladder tr.now{background:#FFF1C6}
.ladder tr.no td{color:var(--brick-d)}
.ladder tr.slow{background:#FBE3DC}

/* the drive HUD (step 6) */
.hud{display:grid;grid-template-columns:repeat(4,minmax(0,1fr));gap:8px;margin-top:10px}
@media(max-width:600px){.hud{grid-template-columns:1fr 1fr}}
.pins{display:flex;gap:4px;flex-wrap:wrap;margin-top:6px}
.pins i{display:inline-block;width:14px;height:14px;border-radius:50%;border:1.8px solid var(--line);background:var(--sheet)}
.pins i.lit{background:var(--yellow)}
.pins i.done{background:var(--grass)}
.status{font:400 16px/1.3 var(--hand);margin-top:8px;min-height:22px}
.status b{font:700 16px var(--sign);color:var(--sky-d)}
.status.hit b{color:var(--brick-d)}

/* ---------- review board ---------- */
.check{display:flex;gap:10px;align-items:flex-start;padding:8px 0;border-bottom:2px dotted rgba(74,46,30,.25);font-size:15.5px}
.check:last-child{border-bottom:0}
.check .ic{flex:none;width:26px;height:26px;border:2px solid var(--line);border-radius:50%;text-align:center;font:700 16px/22px var(--sign)}
.check.ok .ic{background:#BFE3A6;color:var(--grass-d)}.check.no .ic{background:#F4B7A7;color:var(--brick-d)}
.check .why{color:var(--soft);font-size:14.5px}
.brief{background:#EAF4FB;border:2px solid var(--line);border-radius:8px;padding:12px 14px;margin:10px 0;font-size:15.5px}
.brief b{color:var(--brick-d)}
.stars{font-size:26px;letter-spacing:3px;color:#E0A91E;-webkit-text-stroke:1px var(--line)}
.reason{display:grid;gap:6px;margin:6px 0 10px}
.reason label{display:flex;gap:8px;align-items:flex-start;background:var(--sheet);border:2px solid var(--line);border-radius:8px;padding:7px 10px;font-size:15px;cursor:pointer}
.reason input{margin-top:5px}
.checks{margin-top:8px}
.verdict{font:400 16px/1.4 var(--hand);margin-top:8px}
.verdict b{font:700 17px var(--sign)}

/* ---------- field test ---------- */
.fq{padding:12px 0;border-bottom:2px dotted rgba(74,46,30,.25)}
.fq:last-child{border-bottom:0}
.fq .fqt{font-size:15.5px;margin-bottom:7px}
.fq .res{font:400 16px var(--hand);margin-left:8px}
.ok{color:var(--grass-d);font-weight:700}.bad{color:var(--brick-d);font-weight:700}
.honest{padding-left:20px;display:grid;gap:8px;font-size:15.5px}
.muted{color:var(--soft)}
.muted b{color:var(--ink)}

/* ---------- glossary tags ---------- */
.g{text-decoration:underline;text-decoration-style:wavy;text-decoration-color:var(--brick);text-decoration-thickness:1.5px;text-underline-offset:4px;cursor:help;color:inherit}
.g:focus{outline:2px solid var(--sky-d);outline-offset:2px}
#tip{position:fixed;z-index:50;max-width:310px;background:var(--sheet);border:2.5px solid var(--line);border-radius:8px;padding:10px 12px;font-size:14.5px;line-height:1.45;color:var(--ink);box-shadow:3px 4px 0 rgba(74,46,30,.25);display:none;pointer-events:none}
#tip b{font:700 17px var(--sign);color:var(--brick-d)}
#tip .kt{display:block;margin-top:6px;padding-top:6px;border-top:2px dotted rgba(74,46,30,.3);color:var(--soft);font:400 15px var(--hand)}

footer{position:fixed;bottom:0;left:0;right:0;background:#2F5C1C;border-top:2.5px solid var(--line);padding:8px 14px;font:400 15px/1.3 var(--hand);color:#FFFDF6;text-align:center}
.num{font-family:var(--sign);font-weight:700;color:var(--brick-d)}
.row{display:flex;gap:10px;align-items:center;flex-wrap:wrap}
code{font-family:ui-monospace,Menlo,monospace;font-size:.9em;background:#FFF1C6;padding:0 4px;border-radius:4px}
.nextrow{display:flex;justify-content:flex-end;margin:-6px 0 28px}
a.ghost{background:var(--sheet);color:var(--ink);border:2px solid var(--line);padding:6px 13px 7px;border-radius:8px;font:400 16px/1.1 var(--hand);box-shadow:1px 2px 0 var(--line);display:inline-block;text-decoration:none}
a.ghost:hover{background:#FFF1C6}
@media(max-width:480px){.card{padding:14px 12px}.card h2{font-size:25px}.stat .v{font-size:20px}.stat.big .v{font-size:25px}footer{font-size:13px}}
@media(max-width:600px){footer{position:static;margin-top:8px}body{padding-bottom:0}nav{flex-wrap:nowrap;overflow-x:auto;padding:4px 2px 14px;scroll-snap-type:x proximity;-webkit-overflow-scrolling:touch}nav button{flex:none;scroll-snap-align:start}.lr{font-size:14px;padding:4px 6px}}
@media (prefers-reduced-motion:reduce){*{animation:none!important;transition:none!important}}
/* ?shot=1: show one card by itself, for the README screenshots */
body.shot header,body.shot nav,body.shot footer,body.shot .nextrow,body.shot section.on .card:not([data-shot]){display:none}
body.shot{padding-bottom:0}body.shot .wrap{padding:14px}body.shot .card{margin-bottom:0}