:root{
  --substrate:#0b1a17;      /* deep green-black soldermask */
  --substrate-2:#0e211d;
  --panel:#102420;
  --silk:#e8e6dc;           /* silkscreen off-white */
  --silk-dim:#a7ab9f;
  --copper:#c98f3d;         /* single copper/gold trace accent */
  --copper-dim:#8f6531;
  --signal:#4fd18b;         /* restrained test-point green */
  --line:#20443b;           /* faint trace/grid line */
  --line-2:#1a352e;
}
*{box-sizing:border-box}
html{scroll-behavior:smooth}
body{
  margin:0;
  background:var(--substrate);
  color:var(--silk);
  font-family:-apple-system,BlinkMacSystemFont,"Segoe UI",Roboto,Helvetica,Arial,sans-serif;
  line-height:1.6;
  font-size:16px;
  background-image:
    linear-gradient(var(--line-2) 1px,transparent 1px),
    linear-gradient(90deg,var(--line-2) 1px,transparent 1px),
    radial-gradient(circle at 50% 0%,rgba(201,143,61,.06),transparent 60%);
  background-size:32px 32px,32px 32px,100% 100%;
  background-position:-1px -1px,-1px -1px,center top;
}
.mono{font-family:ui-monospace,"SF Mono",SFMono-Regular,Menlo,Consolas,"Liberation Mono",monospace}

a{color:var(--copper);text-decoration:none}
a:hover,a:focus{color:var(--silk);text-decoration:underline;text-underline-offset:3px}
a:focus-visible{outline:2px solid var(--signal);outline-offset:2px;border-radius:2px}

.skip{
  position:absolute;left:-9999px;top:0;z-index:100;
  background:var(--copper);color:#12110c;padding:10px 16px;border-radius:0 0 6px 0;
  font-family:ui-monospace,monospace;font-weight:600;
}
.skip:focus{left:0}

.wrap{max-width:960px;margin:0 auto;padding:0 24px}

/* ---- refdes / silkscreen labels ---- */
.refdes{
  font-family:ui-monospace,monospace;
  font-size:.72rem;letter-spacing:.18em;text-transform:uppercase;
  color:var(--copper);
  display:inline-flex;align-items:center;gap:.6em;
}
.refdes .dot{width:7px;height:7px;border-radius:50%;background:var(--signal);
  box-shadow:0 0 0 3px rgba(79,209,139,.14)}
.stamp{
  font-family:ui-monospace,monospace;font-size:.7rem;letter-spacing:.12em;
  color:var(--silk-dim);text-transform:uppercase;
}

/* ---- header / hero (homepage) ---- */
header.hero{
  border-bottom:1px solid var(--line);
  padding:56px 0 44px;
  position:relative;
}
.hero-top{display:flex;justify-content:space-between;align-items:flex-start;
  gap:16px;flex-wrap:wrap;margin-bottom:28px}
.hero-net{display:flex;gap:20px;flex-wrap:wrap}
.hero-main{display:flex;justify-content:space-between;gap:28px;flex-wrap:wrap;align-items:flex-start}
.boardtitle{
  font-family:ui-monospace,monospace;
  font-size:clamp(2rem,6.5vw,3.6rem);
  font-weight:600;line-height:1.05;margin:0;letter-spacing:-.01em;
  color:var(--silk);
}
.boardtitle .grade{color:var(--copper)}
.subtitle{
  font-family:ui-monospace,monospace;font-size:.82rem;letter-spacing:.14em;
  text-transform:uppercase;color:var(--silk-dim);margin:14px 0 20px;
}
.subtitle b{color:var(--silk);font-weight:600}
.oneliner{font-size:clamp(1.05rem,2.4vw,1.35rem);max-width:36ch;color:var(--silk);
  margin:0}
.revstamp{
  font-family:ui-monospace,monospace;font-size:.7rem;letter-spacing:.1em;
  color:var(--silk-dim);text-align:right;line-height:1.9;
  border:1px solid var(--line);padding:8px 12px;border-radius:4px;
  background:rgba(16,36,32,.5);
}
.revstamp b{color:var(--copper)}

/* ---- topbar (inner pages) ---- */
header.topbar{border-bottom:1px solid var(--line);position:relative}
.tb-inner{display:flex;justify-content:space-between;align-items:center;
  gap:16px;flex-wrap:wrap;padding-top:22px;padding-bottom:22px}
.topbar a.refdes:hover{text-decoration:none;color:var(--silk)}
.stamp-nav{display:flex;gap:18px;flex-wrap:wrap}
.stamp-nav a.stamp:hover,.stamp-nav a.stamp:focus{color:var(--copper);text-decoration:none}

/* ---- section frame ---- */
main{padding:8px 0 0}
section{padding:44px 0;border-bottom:1px solid var(--line);position:relative}
.sec-head{display:flex;align-items:center;gap:16px;margin-bottom:8px}
.sec-head .refdes{white-space:nowrap}
.sec-rule{flex:1;height:1px;background:
  linear-gradient(90deg,var(--copper-dim),var(--line) 60%,transparent)}
h2.sec-title{font-family:ui-monospace,monospace;font-size:1.02rem;letter-spacing:.16em;
  text-transform:uppercase;color:var(--silk);margin:0}
.sec-note{color:var(--silk-dim);font-size:.82rem;font-family:ui-monospace,monospace;
  letter-spacing:.06em;margin:6px 0 22px}

/* dimension-line divider */
.dimline{display:flex;align-items:center;gap:8px;color:var(--copper-dim);
  font-family:ui-monospace,monospace;font-size:.66rem;letter-spacing:.2em;margin:4px 0 24px}
.dimline .bar{flex:1;height:1px;background:var(--copper-dim);position:relative}
.dimline .bar::before,.dimline .bar::after{content:"";position:absolute;top:-3px;
  width:1px;height:7px;background:var(--copper-dim)}
.dimline .bar::before{left:0}
.dimline .bar::after{right:0}

.prose{max-width:64ch;color:var(--silk);font-size:1.05rem}
.prose p{margin:0 0 14px}
.prose strong{color:var(--copper);font-weight:600}

/* ---- BOM / writing table ---- */
.bom-scroll{overflow-x:auto}
table.bom{width:100%;border-collapse:collapse;font-size:.92rem;min-width:520px}
table.bom caption{
  font-family:ui-monospace,monospace;font-size:.68rem;letter-spacing:.18em;
  text-transform:uppercase;color:var(--silk-dim);text-align:left;padding-bottom:10px}
table.bom th,table.bom td{
  text-align:left;padding:11px 14px;border:1px solid var(--line);vertical-align:top}
table.bom thead th{
  font-family:ui-monospace,monospace;font-size:.68rem;letter-spacing:.14em;
  text-transform:uppercase;color:var(--copper);background:rgba(201,143,61,.06);
  font-weight:600}
table.bom td.ref{font-family:ui-monospace,monospace;color:var(--signal);white-space:nowrap}
table.bom td.date{font-family:ui-monospace,monospace;color:var(--silk-dim);white-space:nowrap}
table.bom tr.muted td{color:var(--silk-dim);font-style:italic}
table.bom tbody tr:hover{background:rgba(201,143,61,.04)}

/* ---- off-hours grid ---- */
.grid{display:grid;grid-template-columns:repeat(auto-fit,minmax(210px,1fr));gap:16px;margin-top:8px}
.card{border:1px solid var(--line);border-radius:6px;padding:18px 18px 16px;
  background:linear-gradient(180deg,rgba(16,36,32,.6),rgba(11,26,23,.3));position:relative}
.card .refdes{font-size:.66rem;margin-bottom:10px;color:var(--copper-dim)}
.card h3{margin:0 0 6px;font-size:1.02rem;color:var(--silk);font-weight:600}
.card p{margin:0;color:var(--silk-dim);font-size:.9rem}
.card svg{position:absolute;top:14px;right:14px;opacity:.85}

/* ---- contact ---- */
.links{display:flex;flex-wrap:wrap;gap:12px;margin-top:6px}
.links a{
  font-family:ui-monospace,monospace;font-size:.86rem;letter-spacing:.04em;
  border:1px solid var(--line);border-radius:4px;padding:10px 16px;
  display:inline-flex;align-items:center;gap:10px;background:rgba(16,36,32,.4)}
.links a::before{content:"";width:8px;height:8px;border-radius:50%;
  background:var(--copper);box-shadow:0 0 0 3px rgba(201,143,61,.12)}
.links a:hover{border-color:var(--copper-dim);text-decoration:none}

/* ---- titleblock footer ---- */
footer{padding:40px 0 60px}
.titleblock{border:1px solid var(--copper-dim);border-radius:4px;overflow:hidden;
  font-family:ui-monospace,monospace}
.tb-row{display:grid;grid-template-columns:2fr 1fr 1fr;border-bottom:1px solid var(--line)}
.tb-row:last-child{border-bottom:0}
.tb-cell{padding:12px 14px;border-right:1px solid var(--line)}
.tb-cell:last-child{border-right:0}
.tb-cell .k{font-size:.6rem;letter-spacing:.18em;text-transform:uppercase;color:var(--silk-dim);
  display:block;margin-bottom:4px}
.tb-cell .v{font-size:.86rem;color:var(--silk)}
.tb-cell .v.approve{color:var(--signal)}
.tb-title .v{color:var(--copper);font-weight:600}
.copyline{text-align:center;color:var(--silk-dim);font-family:ui-monospace,monospace;
  font-size:.7rem;letter-spacing:.1em;margin-top:16px}

/* ---- ambient signal pulse on hero trace ---- */
.signaltrace{position:absolute;left:0;right:0;bottom:-1px;height:2px;overflow:hidden}
.signaltrace .pulse{position:absolute;top:0;height:2px;width:120px;
  background:linear-gradient(90deg,transparent,var(--copper),var(--signal),transparent);
  animation:travel 6s linear infinite}
@keyframes travel{from{left:-120px}to{left:100%}}

/* ---- article (single pages) ---- */
.post{padding:44px 0 52px}
h1.posttitle{
  font-family:ui-monospace,monospace;
  font-size:clamp(1.5rem,4.5vw,2.4rem);
  font-weight:600;line-height:1.15;letter-spacing:-.01em;
  color:var(--silk);margin:10px 0 6px}
.postmeta{margin:0 0 30px}
.article{max-width:70ch}
.article h1,.article h2,.article h3,.article h4{
  font-family:ui-monospace,monospace;color:var(--silk);line-height:1.25;
  margin:34px 0 12px;letter-spacing:.02em}
.article h2{font-size:1.25rem;border-bottom:1px solid var(--line);padding-bottom:8px}
.article h2::before{content:"// ";color:var(--copper)}
.article h3{font-size:1.05rem;color:var(--copper)}
.article ul,.article ol{padding-left:1.4em;margin:0 0 14px}
.article li{margin:4px 0}
.article li::marker{color:var(--copper)}
.article blockquote{
  margin:20px 0;padding:12px 20px;border-left:2px solid var(--copper);
  background:rgba(16,36,32,.5);color:var(--silk-dim);font-style:italic}
.article blockquote p:last-child{margin-bottom:0}
.article img{max-width:100%;height:auto;border:1px solid var(--line);border-radius:4px}
.article code{
  font-family:ui-monospace,"SF Mono",Menlo,Consolas,monospace;font-size:.9em;
  background:var(--panel);border:1px solid var(--line);border-radius:3px;padding:1px 5px}
.article pre{
  background:var(--panel);border:1px solid var(--line);border-radius:6px;
  padding:16px;overflow-x:auto;line-height:1.5}
.article pre code{background:none;border:0;padding:0}
.article hr{border:0;height:1px;background:var(--line);margin:32px 0}
.article table{border-collapse:collapse;font-size:.92rem;margin:0 0 14px}
.article table th,.article table td{border:1px solid var(--line);padding:8px 12px;text-align:left}
.article table th{color:var(--copper);font-family:ui-monospace,monospace;font-size:.8rem;
  text-transform:uppercase;letter-spacing:.1em}

/* list pages reuse .post frame */
.listhead{padding-top:44px}

@media (max-width:640px){
  .tb-row{grid-template-columns:1fr 1fr}
  .hero-net{display:none}          /* hide decorative stamps on mobile */
  .revstamp{text-align:left}
}
@media (prefers-reduced-motion:reduce){
  .signaltrace .pulse{animation:none;display:none}
  html{scroll-behavior:auto}
}