:root{
  --paper:#fbf7ee; --bg:#f1ead9; --card:#fffdf8; --ink:#1f2622; --muted:#5d665f; --line:#d9cfb8; --grid:#e6dcc6;
  --block:#3f8f3a; --block-top:#6cbf5a; --block-dark:#2c6a29; --ghost:#d8e4cf; --mark:#e0a526; --axis:#c2452d;
  --accent:#2f6fb0; --focus:#e0a526; --radius:10px;
  --font:"IBM Plex Sans",system-ui,-apple-system,Segoe UI,Roboto,sans-serif; --pixel:"Silkscreen","IBM Plex Mono",monospace;
}
@media (prefers-color-scheme:dark){
  :root{--paper:#1b211d;--bg:#141815;--card:#1f2622;--ink:#ecf0e8;--muted:#a3ada5;--line:#344039;--grid:#2b342e;
    --block:#5fb352;--block-top:#8fd47c;--block-dark:#3f8a36;--ghost:#33452f;--mark:#f0b93a;--axis:#ef7158;--accent:#7fb3e8}
}
*{box-sizing:border-box}
html{-webkit-text-size-adjust:100%}
body{margin:0;background:var(--bg);color:var(--ink);font:16px/1.6 var(--font);
  background-image:linear-gradient(var(--grid) 1px,transparent 1px),linear-gradient(90deg,var(--grid) 1px,transparent 1px);background-size:24px 24px;background-attachment:fixed}
a{color:var(--accent)}
a:focus-visible,button:focus-visible,input:focus-visible,label:focus-within{outline:3px solid var(--focus);outline-offset:2px}
.wrap{max-width:1120px;margin:0 auto;padding:0 16px}
header.top{background:var(--ink);color:var(--paper);position:sticky;top:0;z-index:20}
header.top .wrap{display:flex;align-items:center;gap:16px;min-height:56px}
.logo{font-family:var(--pixel);font-size:18px;white-space:nowrap;color:var(--paper);text-decoration:none;display:flex;align-items:center;gap:10px;letter-spacing:.5px}
.logo svg{width:26px;height:26px}
nav.main{margin-left:auto;display:flex;gap:4px;flex-wrap:wrap}
nav.main a{color:var(--paper);text-decoration:none;padding:6px 10px;border-radius:6px;font-size:15px;opacity:.85}
nav.main a:hover,nav.main a[aria-current]{opacity:1;background:rgba(255,255,255,.12)}
.nav-toggle{display:none;margin-left:auto;background:none;border:1px solid rgba(255,255,255,.4);color:var(--paper);border-radius:6px;padding:6px 10px;font:inherit}
@media (max-width:760px){
  .nav-toggle{display:block}
  nav.main{display:none;position:absolute;left:0;right:0;top:56px;background:var(--ink);flex-direction:column;padding:8px 16px 14px}
  body.nav-open nav.main{display:flex}
}
.hero{padding:26px 0 8px}
h1{font-family:var(--pixel);font-weight:400;font-size:clamp(24px,4.4vw,40px);line-height:1.15;margin:0 0 8px}
.lede{color:var(--muted);margin:0 0 4px;max-width:760px}
h2{font-size:24px;line-height:1.25;margin:34px 0 10px}
h3{font-size:18px;margin:22px 0 6px}
.tool{background:var(--card);border:2px solid var(--ink);border-radius:var(--radius);box-shadow:6px 6px 0 var(--ink);margin:14px 0 26px;display:grid;grid-template-columns:300px 1fr;overflow:hidden}
.tool:not(.ready) .view{min-height:300px}
.panel{padding:16px;border-right:2px solid var(--ink);display:flex;flex-direction:column;gap:14px}
.view{padding:14px;min-width:0}
@media (max-width:860px){.tool{grid-template-columns:1fr}.panel{border-right:0;border-bottom:2px solid var(--ink)}}
.field label,.legend{display:block;font-size:13px;font-weight:600;text-transform:uppercase;letter-spacing:.06em;color:var(--muted);margin-bottom:4px}
.stepper{display:flex;align-items:stretch}
.stepper input{width:100%;min-width:0;font:600 20px var(--font);padding:8px 10px;border:2px solid var(--ink);border-left:0;border-right:0;background:var(--paper);color:var(--ink);text-align:center;border-radius:0;-moz-appearance:textfield}
.stepper input::-webkit-inner-spin-button{-webkit-appearance:none}
.stepper button{width:46px;border:2px solid var(--ink);background:var(--bg);color:var(--ink);font:700 20px var(--font);cursor:pointer}
.stepper button:first-child{border-radius:8px 0 0 8px}.stepper button:last-child{border-radius:0 8px 8px 0}
.stepper button:active{background:var(--mark)}
.two{display:grid;grid-template-columns:1fr 1fr;gap:10px}
.three{display:grid;grid-template-columns:1fr 1fr 1fr;gap:8px}
.three .stepper button{width:30px;font-size:16px}.three .stepper input{font-size:17px;padding:8px 2px}
.check{display:flex;gap:8px;align-items:center;font-size:15px;cursor:pointer}
.check input{width:18px;height:18px;accent-color:var(--block)}
.seg{display:grid;grid-template-columns:repeat(2,1fr);gap:6px}
.seg label{display:block;cursor:pointer}
.seg input{position:absolute;opacity:0}
.seg span{display:block;text-align:center;padding:8px 6px;border:2px solid var(--ink);border-radius:8px;font-weight:600;font-size:15px;background:var(--paper)}
.seg input:checked+span{background:var(--block);color:#fff}
.seg input:focus-visible+span{outline:3px solid var(--focus);outline-offset:2px}
.presets{display:flex;flex-wrap:wrap;gap:6px}
.chip{border:1.5px solid var(--ink);background:var(--paper);color:var(--ink);border-radius:20px;padding:3px 10px;font:600 14px var(--font);cursor:pointer}
.chip:hover{background:var(--mark)}
.btns{display:flex;flex-wrap:wrap;gap:6px}
.btn{border:2px solid var(--ink);background:var(--paper);color:var(--ink);border-radius:8px;padding:7px 12px;font:600 14px var(--font);cursor:pointer;display:inline-flex;gap:6px;align-items:center}
.btn.primary{background:var(--ink);color:var(--paper)}
.btn:hover{transform:translate(-1px,-1px);box-shadow:2px 2px 0 var(--ink)}
.stats{display:grid;grid-template-columns:repeat(4,1fr);gap:8px;margin-bottom:10px}
.stats div{background:var(--paper);border:1.5px solid var(--line);border-radius:8px;padding:6px 8px;line-height:1.2}
.stats b{display:block;font-size:20px}.stats span{font-size:12px;color:var(--muted)}
@media (max-width:520px){.stats{grid-template-columns:repeat(2,1fr)}}
.toolbar{display:flex;flex-wrap:wrap;gap:6px;align-items:center;margin-bottom:10px}
.toolbar .spacer{flex:1}
.canvas-wrap{overflow:auto;max-height:72vh;border:1.5px solid var(--line);border-radius:8px;background:var(--paper);-webkit-overflow-scrolling:touch}
.canvas-wrap canvas{display:block;cursor:crosshair;touch-action:manipulation}
.coord,.quarter{font-size:14px;color:var(--muted);margin:8px 0 0;min-height:1.4em}
.layerbar{display:flex;align-items:center;gap:8px;margin-bottom:10px;flex-wrap:wrap}
.layerbar input[type=range]{flex:1;min-width:140px;accent-color:var(--block);height:28px}
.layer-label{font-weight:700;min-width:150px}
.iso-wrap{margin-top:12px;border:1.5px solid var(--line);border-radius:8px;background:var(--paper);overflow:auto;text-align:center}
.iso-wrap canvas{display:inline-block}
details.rowsbox{margin-top:12px;border:1.5px solid var(--line);border-radius:8px;background:var(--paper)}
details.rowsbox summary{cursor:pointer;padding:8px 12px;font-weight:600}
.rows{max-height:340px;overflow:auto;padding:0 12px 10px}
.rows table{border-collapse:collapse;width:100%;font-size:14px}
.rows th,.rows td{text-align:left;padding:3px 8px;border-bottom:1px solid var(--line);vertical-align:top}
.rows i{color:var(--muted);font-style:normal}
.rows tr.mid td{background:var(--ghost)}
.content{background:var(--card);border:1.5px solid var(--line);border-radius:var(--radius);padding:8px 22px 22px;margin-bottom:26px}
.content p,.content li{max-width:780px}
.cards{display:grid;grid-template-columns:repeat(auto-fill,minmax(220px,1fr));gap:12px;margin:12px 0}
.cards a{display:block;border:2px solid var(--ink);border-radius:10px;padding:12px 14px;text-decoration:none;color:var(--ink);background:var(--paper)}
.cards a:hover{box-shadow:4px 4px 0 var(--ink);transform:translate(-2px,-2px)}
.cards b{display:block;font-size:17px}.cards span{color:var(--muted);font-size:14px}
.cards .soon{opacity:.6;border-style:dashed;pointer-events:none}
table.ref{border-collapse:collapse;margin:10px 0;font-size:15px}
table.ref th,table.ref td{border:1px solid var(--line);padding:4px 10px;text-align:left}
.faq details{border-bottom:1px solid var(--line);padding:10px 0}
.faq summary{cursor:pointer;font-weight:600}
footer{background:var(--ink);color:var(--paper);padding:22px 0;font-size:14px;margin-top:20px}
footer a{color:var(--paper)}
footer .cols{display:flex;flex-wrap:wrap;gap:8px 18px}
footer p{opacity:.75;margin:10px 0 0}
#toast{position:fixed;left:50%;bottom:22px;transform:translateX(-50%) translateY(80px);background:var(--ink);color:var(--paper);padding:8px 16px;border-radius:8px;transition:transform .2s;z-index:50}
#toast.on{transform:translateX(-50%) translateY(0)}
#print-sheet{display:none}
@media print{
  header.top,footer,.panel,.toolbar,.layerbar,.content,.hero .lede,nav,.iso-wrap,details.rowsbox,.coord{display:none!important}
  body{background:#fff}
  .tool{box-shadow:none;border:0;display:block}
  .canvas-wrap{max-height:none;overflow:visible;border:0}
  body.printing-layers main>*{display:none!important}
  body.printing-layers #print-sheet{display:flex!important;flex-wrap:wrap;gap:10px}
  #print-sheet h2{width:100%;margin:0 0 6px}
  #print-sheet figure{margin:0;break-inside:avoid}
  #print-sheet figcaption{font-size:11px}
}
@media (max-width:420px){.logo{font-size:14px;gap:6px}.logo svg{width:20px;height:20px}}