/* open-hardware.org: solder-mask green, copper and silkscreen white */
@font-face{font-family:"Atkinson";src:url(/assets/fonts/atkinson-hyperlegible-latin-400-normal.woff2) format("woff2");font-weight:400;font-style:normal;font-display:swap}
@font-face{font-family:"Atkinson";src:url(/assets/fonts/atkinson-hyperlegible-latin-400-italic.woff2) format("woff2");font-weight:400;font-style:italic;font-display:swap}
@font-face{font-family:"Atkinson";src:url(/assets/fonts/atkinson-hyperlegible-latin-700-normal.woff2) format("woff2");font-weight:700;font-style:normal;font-display:swap}
@font-face{font-family:"Grotesk";src:url(/assets/fonts/space-grotesk-latin-500-normal.woff2) format("woff2");font-weight:500;font-display:swap}
@font-face{font-family:"Grotesk";src:url(/assets/fonts/space-grotesk-latin-700-normal.woff2) format("woff2");font-weight:700;font-display:swap}
@font-face{font-family:"JBMono";src:url(/assets/fonts/jetbrains-mono-latin-400-normal.woff2) format("woff2");font-weight:400;font-display:swap}
@font-face{font-family:"JBMono";src:url(/assets/fonts/jetbrains-mono-latin-600-normal.woff2) format("woff2");font-weight:600;font-display:swap}

:root{
  --bg:#F3F5EF; --panel:#FFFFFF; --ink:#13201B; --muted:#4A5A53; --line:#CCD6CF;
  --mask:#0E3A2C; --mask-2:#15503D; --silk:#F4F7F2; --copper:#A85A1A; --copper-soft:#F3E3D3;
  --link:#0B6E4F; --focus:#D9822B; --tint:#E6ECE5;
  --head:"Grotesk",system-ui,sans-serif; --body:"Atkinson",system-ui,sans-serif; --mono:"JBMono",ui-monospace,monospace;
}
@media (prefers-color-scheme:dark){:root{
  --bg:#0C1512; --panel:#13201B; --ink:#E4ECE7; --muted:#A3B5AC; --line:#2A3D35;
  --mask:#0A2A20; --mask-2:#123E30; --copper:#E39A5B; --copper-soft:#3A2817;
  --link:#7FD6B2; --tint:#101C18;
}}
*{box-sizing:border-box}
html{-webkit-text-size-adjust:100%;scroll-behavior:smooth}
body{margin:0;background:var(--bg);color:var(--ink);font:400 1.0625rem/1.65 var(--body)}
img,svg{max-width:100%;height:auto}
a{color:var(--link);text-underline-offset:3px;text-decoration-thickness:1px}
a:hover{text-decoration-thickness:2px}
:focus-visible{outline:3px solid var(--focus);outline-offset:2px;border-radius:2px}
h1,h2,h3{font-family:var(--head);font-weight:700;line-height:1.15;letter-spacing:-.01em}
h1{font-size:clamp(2rem,1.3rem + 3vw,3.3rem);margin:.2em 0 .35em}
h2{font-size:clamp(1.4rem,1.1rem + 1vw,1.85rem);margin:1.8em 0 .5em}
h3{font-size:1.2rem;margin:1.4em 0 .4em}
.mono,code,pre{font-family:var(--mono)}
.small{font-size:.875rem;color:var(--muted)}
.skip{position:absolute;left:-999px;top:0;background:var(--copper);color:#fff;padding:8px 14px;z-index:10}
.skip:focus{left:8px;top:8px}
.frame{max-width:1180px;margin:0 auto;padding:0 20px}
.narrow{max-width:780px}

/* top rail + header */
.rail{background:var(--mask);color:#9DC3B1;font:600 .7rem/1 var(--mono);letter-spacing:.18em;display:flex;justify-content:space-between;padding:7px 20px}
.top{background:var(--panel);border-bottom:1px solid var(--line)}
.top-in{display:flex;align-items:center;justify-content:space-between;gap:16px;flex-wrap:wrap;padding-top:14px;padding-bottom:14px}
.logo{display:flex;align-items:center;gap:10px;color:var(--ink);text-decoration:none;font:700 1.2rem/1 var(--head)}
.logo b{color:var(--copper)}
.nav{display:flex;flex-wrap:wrap;gap:4px}
.nav a{color:var(--ink);text-decoration:none;font:500 .95rem/1 var(--head);padding:9px 12px;border-radius:4px}
.nav a:hover{background:var(--tint)}
.nav a[aria-current="page"]{background:var(--mask);color:var(--silk)}

/* hero */
.hero{background:var(--mask);color:var(--silk);position:relative;overflow:hidden;
  background-image:linear-gradient(90deg,transparent 0 calc(100% - 1px),rgba(255,255,255,.05) 0),linear-gradient(transparent 0 calc(100% - 1px),rgba(255,255,255,.05) 0);background-size:28px 28px}
.hero-in{padding-top:56px;padding-bottom:110px;max-width:900px;margin-left:max(20px,calc((100% - 1180px)/2 + 20px));padding-left:0}
.hero .tag{color:#F2C49A;border-color:#5C8C77}
.hero h1{color:#fff;max-width:18ch}
.lede{font-size:1.2rem;color:var(--muted);max-width:60ch}
.hero .lede{color:#C9DDD2}
.specs{list-style:none;padding:0;margin:26px 0 0;display:flex;flex-wrap:wrap;gap:10px}
.specs li{font:400 .85rem/1 var(--mono);border:1px solid #3F7461;padding:10px 12px;border-radius:3px;color:#C9DDD2}
.specs b{color:#fff;font-weight:600;margin-right:4px}
.tag{display:inline-block;font:600 .75rem/1 var(--mono);letter-spacing:.12em;text-transform:uppercase;color:var(--copper);border:1px solid var(--line);padding:7px 10px;border-radius:3px;margin:0}

/* chooser board */
.chooser-wrap{margin-top:-74px;position:relative}
.board{background:var(--panel);border:2px solid var(--mask);border-radius:14px;box-shadow:0 18px 40px rgba(10,40,30,.14);overflow:hidden}
.board-head{display:flex;justify-content:space-between;align-items:center;gap:12px;padding:16px 22px;border-bottom:1px dashed var(--line);background:var(--tint)}
.board-head h2{margin:0;font-size:1.3rem}
.board-grid{display:grid;grid-template-columns:minmax(0,1.1fr) minmax(0,1fr)}
.qs{padding:22px;border-right:1px dashed var(--line)}
.q{border:0;margin:0 0 22px;padding:0}
.q[hidden]{display:none}
.q legend{font:700 1.05rem/1.35 var(--head);margin-bottom:10px;padding:0}
.ref{display:inline-block;font:600 .75rem/1 var(--mono);background:var(--copper);color:#fff;padding:5px 7px;border-radius:3px;margin-right:6px;vertical-align:2px}
.q label{display:flex;gap:10px;align-items:flex-start;padding:10px 12px;border:1px solid var(--line);border-radius:6px;margin:6px 0;cursor:pointer;background:var(--bg)}
.q label:hover{border-color:var(--link)}
.q input{margin-top:5px;accent-color:var(--mask-2);flex:none}
.q label:has(input:checked){border-color:var(--mask-2);background:var(--copper-soft)}
.result{padding:22px;background:linear-gradient(var(--panel),var(--panel)) padding-box}
.result-empty{color:var(--muted);font-family:var(--mono);font-size:.9rem;border:1px dashed var(--line);padding:18px;border-radius:6px;margin:0}
.lic{border:1px solid var(--line);border-radius:8px;padding:16px 18px;margin:0 0 14px;background:var(--bg)}
.lic-main{border:2px solid var(--copper);background:var(--panel)}
.lic h3{margin:.1em 0 .3em;font-size:1.35rem}
.lic p{margin:.5em 0}
.lic-role{font:600 .72rem/1 var(--mono);letter-spacing:.12em;text-transform:uppercase;color:var(--copper);margin:0 0 4px!important}
.lic-meta{display:flex;flex-wrap:wrap;gap:8px;font-size:.88rem;color:var(--muted)}
.lic-meta code{background:var(--tint);padding:1px 6px;border-radius:3px}
.lic-owe{font-size:.95rem}
.snippet{border:1px solid var(--line);border-radius:8px;padding:14px 16px;margin:0 0 14px}
.snippet pre{margin:6px 0 10px;overflow-x:auto;font-size:.88rem}

.note{font-size:.93rem;color:var(--muted);border-left:3px solid var(--copper);padding:2px 0 2px 12px}
.board-foot{margin:0;padding:12px 22px;font-size:.88rem;color:var(--muted);border-top:1px dashed var(--line)}
.ghost{font:500 .9rem/1 var(--head);background:transparent;color:var(--ink);border:1px solid var(--line);padding:8px 12px;border-radius:4px;cursor:pointer}
.ghost:hover{border-color:var(--ink)}

/* blocks */
.block{padding:56px 0}
.block.tint{background:var(--tint);border-top:1px solid var(--line);border-bottom:1px solid var(--line)}
.block-head{display:flex;justify-content:space-between;align-items:baseline;gap:12px;flex-wrap:wrap}
.block-head h2{margin:0 0 16px}
.table-wrap{overflow-x:auto;max-width:100%}
.bom{width:100%;border-collapse:collapse;background:var(--panel);border:1px solid var(--line);font-size:.98rem}
.bom th{font:600 .75rem/1 var(--mono);text-transform:uppercase;letter-spacing:.1em;text-align:left;color:var(--muted);background:var(--tint);padding:12px}
.bom td{padding:13px 12px;border-top:1px solid var(--line);vertical-align:top}
.bom td a{font-weight:700}
.bom td.mono{white-space:nowrap;color:var(--copper);font-size:.88rem}
.two{display:grid;grid-template-columns:1fr 1.2fr;gap:40px;align-items:start}
.two h2{margin-top:0}
.pads{list-style:none;margin:0;padding:0;display:grid;grid-template-columns:1fr 1fr;gap:14px;counter-reset:pad}
.pads li{background:var(--panel);border:1px solid var(--line);border-radius:10px;padding:16px 16px 16px 52px;position:relative;counter-increment:pad}
.pads li::before{content:counter(pad);position:absolute;left:14px;top:14px;width:26px;height:26px;border-radius:50%;border:3px solid var(--copper);font:600 .75rem/20px var(--mono);text-align:center;color:var(--copper)}
.pads b{display:block;font-family:var(--head)}
.pads span{color:var(--muted);font-size:.95rem}
.arrow{font-weight:700}
.arrow::after{content:" \2192"}
.notes{display:grid;grid-template-columns:repeat(auto-fill,minmax(260px,1fr));gap:16px}
.notes.col{grid-template-columns:1fr}
.note-card{background:var(--panel);border:1px solid var(--line);border-top:4px solid var(--mask-2);border-radius:6px;padding:16px 18px}
.note-card h2,.note-card h3{margin:.2em 0 .3em;font-size:1.2rem}
.note-card p{margin:.3em 0}
.faq details{border-bottom:1px solid var(--line);padding:4px 0}
.faq summary{cursor:pointer;font:700 1.05rem/1.4 var(--head);padding:12px 0;list-style:none;display:flex;justify-content:space-between;gap:12px}
.faq summary::-webkit-details-marker{display:none}
.faq summary::after{content:"+";font-family:var(--mono);color:var(--copper);font-size:1.2rem}
.faq details[open] summary::after{content:"\2212"}
.faq details p{margin:0 0 14px;color:var(--ink)}
.faq-group h2{font-size:1.35rem}

/* documents */
.doc-head{padding:30px 0 10px;border-bottom:1px solid var(--line);margin-bottom:30px}
.crumbs{list-style:none;padding:0;margin:0 0 18px;display:flex;flex-wrap:wrap;gap:6px;font-size:.85rem;color:var(--muted)}
.crumbs li+li::before{content:"/";margin-right:6px;color:var(--line)}
.crumbs a{color:var(--muted)}
.meta{display:flex;flex-wrap:wrap;gap:6px 18px;font:400 .82rem/1.4 var(--mono);color:var(--muted)}
.doc{display:grid;grid-template-columns:240px minmax(0,1fr);gap:48px;align-items:start}
.toc{position:sticky;top:20px;font-size:.92rem;border-left:3px solid var(--mask-2);padding-left:14px}
.toc-h{font:600 .72rem/1 var(--mono);letter-spacing:.14em;text-transform:uppercase;color:var(--muted);margin:4px 0 10px}
.toc ol{margin:0 0 16px;padding-left:18px}
.toc li{margin:6px 0}
.toc a{color:var(--ink);text-decoration:none}
.toc a:hover{color:var(--link);text-decoration:underline}
.toc-cta{display:inline-block;background:var(--mask);color:var(--silk)!important;text-decoration:none;padding:9px 12px;border-radius:4px;font:500 .88rem/1.2 var(--head)}
.prose{max-width:70ch;padding-bottom:40px}
.prose h2{border-top:1px dashed var(--line);padding-top:24px}
.prose li{margin:.35em 0}
.prose code{background:var(--tint);padding:1px 5px;border-radius:3px;font-size:.9em}
.prose pre{background:var(--mask);color:var(--silk);padding:14px 16px;border-radius:8px;overflow-x:auto;font-size:.88rem}
.prose pre code{background:none;padding:0}
.prose blockquote{margin:1.2em 0;padding:4px 0 4px 18px;border-left:4px solid var(--copper);color:var(--muted)}
.prose table{border-collapse:collapse;width:100%;font-size:.95rem}
.prose th,.prose td{border:1px solid var(--line);padding:9px 10px;text-align:left;vertical-align:top}
.prose th{background:var(--tint);font-family:var(--head)}
.prose .lic-block{background:var(--panel);border:1px solid var(--line);border-radius:10px;padding:2px 18px 6px;margin:18px 0}
.related{background:var(--tint);border-radius:8px;padding:4px 18px 10px;margin-top:30px}
.related h2{border:0;font-size:1.15rem;padding-top:8px}
.pager{display:flex;justify-content:space-between;gap:16px;margin-top:30px}
.pager a{display:block;border:1px solid var(--line);border-radius:8px;padding:12px 14px;text-decoration:none;max-width:48%;background:var(--panel)}
.pager a.nx{text-align:right;margin-left:auto}
.pager small{display:block;font:600 .72rem/1.4 var(--mono);text-transform:uppercase;letter-spacing:.1em;color:var(--muted)}
.glist{list-style:none;padding:0;margin:0 0 50px}
.glist li{display:grid;grid-template-columns:70px 1fr;gap:12px;border-bottom:1px solid var(--line);padding:18px 0}
.glist .ref{background:none;color:var(--copper);font-size:1rem;padding:0}
.glist h2{margin:0 0 .3em;font-size:1.35rem}
.glist p{margin:.3em 0}

/* footer */
.foot{background:var(--mask);color:#C9DDD2;margin-top:40px;padding-top:40px}
.foot a{color:#fff}
.foot-in{display:grid;grid-template-columns:2fr 1fr 1fr;gap:30px}
.foot-name{font:700 1.2rem/1 var(--head);color:#fff}
.foot-name b{color:#F2C49A}
.foot-h{font:600 .75rem/1 var(--mono);letter-spacing:.14em;text-transform:uppercase;color:#9DC3B1}
.foot ul{list-style:none;padding:0;margin:0}
.foot li{margin:8px 0}
.foot .small{color:#9DC3B1}
.fine{display:flex;flex-wrap:wrap;justify-content:space-between;gap:8px;font:400 .8rem/1 var(--mono);color:#9DC3B1;border-top:1px solid var(--mask-2);margin-top:30px;padding-top:16px;padding-bottom:22px}

@media (max-width:900px){
  .board-grid,.two,.doc,.foot-in{grid-template-columns:minmax(0,1fr)}
  .doc>*{min-width:0}
  .qs{border-right:0;border-bottom:1px dashed var(--line)}
  .toc{position:static}
  .hide-s{display:none}
}
@media (max-width:560px){
  .frame{padding:0 16px}
  .hero-in{padding-top:36px;padding-bottom:104px;margin-left:0;padding-left:16px;padding-right:16px}
  .specs li{padding:8px 10px}
  .pads{grid-template-columns:1fr}
  .nav a{padding:8px 9px;font-size:.9rem}
  .rail span+span{display:none}
  .qs,.result{padding:16px}
  .board-head{padding:14px 16px}
  .pager{flex-direction:column}
  .pager a{max-width:100%}
  .glist li{grid-template-columns:1fr;gap:4px}
}
@media (prefers-reduced-motion:reduce){html{scroll-behavior:auto}}