/* Fekzen.se – Marine ECU guide */
:root{
  --bg:#121416;--panel:#1a1d20;--ink:#ebe9e4;--muted:#9097a0;--line:#2a2e33;
  --or:#ff8a1f;--or-hover:#ffa24d;--hex:#323941;--hex-or:#b0601a;
  --in:#8fc1e3;--gnd:#9097a0;
  --sans:"IBM Plex Sans",system-ui,-apple-system,"Segoe UI",Roboto,sans-serif;
  --mono:"IBM Plex Mono",ui-monospace,Consolas,"Courier New",monospace;
  --display:"Chakra Petch",var(--sans);
  --head-h:118px;
  color-scheme:dark;
}
*{box-sizing:border-box}
html{-webkit-text-size-adjust:100%;scroll-behavior:smooth}
body{margin:0;background:var(--bg);color:var(--ink);font-family:var(--sans);font-size:16px;line-height:1.55}
img{max-width:100%}
a{color:inherit}
:focus-visible{outline:2px solid var(--or);outline-offset:3px}
.wrap{max-width:1180px;margin:0 auto;padding-inline:clamp(16px,4vw,40px)}
main,footer{position:relative;z-index:1}
[id]{scroll-margin-top:calc(var(--head-h) + 12px)}

/* hex dump pattern, fixed down the right side */
.hexbg{position:fixed;top:0;bottom:0;right:0;width:58%;z-index:0;font:13px/1.9 var(--mono);color:var(--hex);white-space:pre;overflow:hidden;user-select:none;pointer-events:none;padding-top:24px;
  -webkit-mask-image:linear-gradient(90deg,transparent 0,#000 34%);mask-image:linear-gradient(90deg,transparent 0,#000 34%)}
.hexbg b{color:var(--hex-or);font-weight:400}

/* header + ECU menu */
header.site{position:sticky;top:0;z-index:20;background:rgba(18,20,22,.94);backdrop-filter:blur(6px);-webkit-backdrop-filter:blur(6px);border-bottom:1px solid var(--line)}
.bar{display:flex;align-items:center;gap:14px 24px;padding-block:10px;max-width:1600px}
.logo{display:block;line-height:0;flex:none}
.logo img{height:clamp(26px,2.4vw,32px);width:auto;display:block}
.ecunav{display:flex;flex-wrap:wrap;gap:4px;margin-left:auto;justify-content:flex-end}
.ecunav a{display:inline-flex;gap:4px;align-items:baseline;padding:4px 6px;border:1px solid var(--line);border-radius:2px;text-decoration:none;font:500 11.5px var(--mono);white-space:nowrap;background:var(--bg);transition:border-color .15s,color .15s,background .15s}
.ecunav a b{font:600 12.5px var(--display);letter-spacing:.04em;text-transform:uppercase;color:var(--ink)}
.ecunav a span{color:var(--muted)}
.ecunav a:hover,.ecunav a.on{border-color:var(--or)}
.ecunav a.on{background:#241a10}
.ecunav a:hover b,.ecunav a.on b{color:var(--or)}
.ecunav a.ext b,.ecunav a.proj-link b{color:var(--muted)}
.menu-btn{display:none;align-items:center;gap:10px;margin-left:auto;font:600 14px var(--display);text-transform:uppercase;letter-spacing:.06em;color:var(--ink);background:var(--bg);border:1px solid var(--line);border-radius:2px;padding:9px 14px;cursor:pointer}
.menu-btn:hover,.menu-btn[aria-expanded="true"]{border-color:var(--or);color:var(--or)}
.menu-btn .bars{position:relative;width:18px;height:2px;background:currentColor}
.menu-btn .bars::before,.menu-btn .bars::after{content:"";position:absolute;left:0;width:18px;height:2px;background:currentColor;transition:transform .15s}
.menu-btn .bars::before{top:-6px}.menu-btn .bars::after{top:6px}
.menu-btn[aria-expanded="true"] .bars{background:transparent}
.menu-btn[aria-expanded="true"] .bars::before{transform:translateY(6px) rotate(45deg)}
.menu-btn[aria-expanded="true"] .bars::after{transform:translateY(-6px) rotate(-45deg)}

/* buttons */
.btns{display:flex;flex-wrap:wrap;gap:12px}
.btn{display:inline-flex;align-items:center;gap:8px;font:600 15px var(--sans);text-decoration:none;padding:12px 20px;border:1.5px solid transparent;border-radius:2px;transition:background .15s,border-color .15s}
.btn.pri{background:var(--or);color:var(--bg)}
.btn.pri:hover{background:var(--or-hover)}
.btn.sec{border-color:var(--line);color:var(--ink);background:var(--bg)}
.btn.sec:hover{border-color:var(--or)}
.btn svg{width:18px;height:18px;fill:none;stroke:currentColor;stroke-width:1.8}

/* hero */
.hero{border-bottom:1px solid var(--line)}
.hero .wrap{display:grid;grid-template-columns:1.25fr .75fr;gap:48px;align-items:center;padding-block:clamp(40px,6vw,80px)}
.tag{display:inline-flex;gap:10px;align-items:center;font:500 12px var(--mono);color:var(--or);text-transform:uppercase;letter-spacing:.1em;margin:0 0 16px}
.tag::before{content:"";width:22px;height:2px;background:var(--or)}
h1{font:700 clamp(30px,4.6vw,56px)/1.05 var(--display);text-transform:uppercase;letter-spacing:-.01em;margin:0 0 24px;text-wrap:balance}
h1 em,h2 em{font-style:normal;color:var(--or)}
.hero p{margin:0 0 14px;color:#c9ccd1;max-width:62ch}
.hero .lead{font-size:18.5px;color:var(--ink);line-height:1.6}
.hero .warn{font:13px/1.6 var(--mono);color:var(--muted);border-left:2px solid var(--or);padding-left:14px;margin:22px 0 28px}
.hero-img{position:relative;margin:0;border:1px solid var(--line);background:var(--panel);padding:10px}
.hero-img img{display:block;width:100%;height:auto;aspect-ratio:1024/995;object-fit:cover;filter:saturate(.9) contrast(1.05)}
.hero-img figcaption{display:flex;justify-content:space-between;gap:12px;font:12px var(--mono);color:var(--muted);padding-top:10px}
.hero-img figcaption b{color:var(--or);font-weight:500;white-space:nowrap}
.corner{position:absolute;width:14px;height:14px;border-color:var(--or);border-style:solid;z-index:1}
.c1{top:-1px;left:-1px;border-width:2px 0 0 2px}
.c2{bottom:-1px;right:-1px;border-width:0 2px 2px 0}

/* type legend */
.legend{display:flex;flex-wrap:wrap;align-items:center;gap:8px 18px;margin-top:28px;padding:12px 16px;border:1px solid var(--line);background:rgba(18,20,22,.9);font:12px var(--mono);color:var(--muted)}
.legend>b{font:600 13px var(--display);text-transform:uppercase;letter-spacing:.08em;color:var(--ink)}
.legend span{display:inline-flex;gap:8px;align-items:center}
.legend i{font-style:normal}

/* ECU sections */
.ecu{padding-block:clamp(44px,6vw,72px) 8px;border-bottom:1px solid var(--line)}
.ecu-head{display:grid;grid-template-columns:1fr minmax(320px,440px);gap:24px 48px;align-items:start;margin-bottom:28px}
.ecu h2{font:700 clamp(24px,2.8vw,34px)/1.15 var(--display);text-transform:uppercase;letter-spacing:.01em;margin:0 0 16px;text-wrap:balance}
.ecu .about{margin:0 0 12px;color:#c9ccd1;max-width:62ch}
.ecu .ex{margin:0;font:13px/1.7 var(--mono);color:var(--muted);max-width:70ch}
.toc ul{list-style:none;margin:0;padding:0;border:1px solid var(--line);background:rgba(18,20,22,.92)}
.toc li+li{border-top:1px solid var(--line)}
.toc a{display:grid;grid-template-columns:28px 1fr auto;gap:12px;align-items:center;padding:11px 14px;text-decoration:none;font-size:14.5px;line-height:1.35;transition:background .15s}
.toc a:hover{background:#202428}
.toc svg{width:26px;height:26px;fill:none;stroke:var(--or);stroke-width:1.7;stroke-linecap:round;stroke-linejoin:round}
.toc i{font-style:normal;color:var(--muted);font-family:var(--mono)}
.toc a:hover i{color:var(--or)}
.toc .sw a{background:#241a10;font-weight:600}
.toc .sw a:hover{background:#2e2114}
.toc .sw span{color:var(--or);text-decoration:underline;text-underline-offset:3px;text-decoration-thickness:1px}
.toc .sw i{color:var(--or)}

.blk{margin-top:36px}
.blk h3{display:flex;align-items:center;gap:14px;margin:0 0 14px;font:600 19px/1.25 var(--display);text-transform:uppercase;letter-spacing:.03em}
.bi{flex:none;width:46px;height:46px;border:1px solid var(--line);background:var(--bg);color:var(--or);display:grid;place-items:center}
.bi svg{width:28px;height:28px;fill:none;stroke:currentColor;stroke-width:1.7;stroke-linecap:round;stroke-linejoin:round}
.blk h4{margin:26px 0 10px;font:500 13px var(--mono);color:var(--or);letter-spacing:.03em;display:flex;gap:10px;align-items:center}
.blk h4::before{content:"";width:16px;height:2px;background:var(--or);flex:none}
.blk h3+h4{margin-top:4px}

/* tables */
.tw{overflow-x:auto;border:1px solid var(--line);background:rgba(18,20,22,.94);-webkit-overflow-scrolling:touch}
.tbl{width:100%;border-collapse:collapse;font-size:14px;line-height:1.4}
.tbl th,.tbl td{padding:8px 14px;text-align:left;vertical-align:top;border-bottom:1px solid var(--line)}
.tbl thead th{font:600 12.5px/1.3 var(--display);text-transform:uppercase;letter-spacing:.06em;color:var(--muted);background:var(--panel);white-space:nowrap}
.tbl tbody tr:last-child td{border-bottom:0}
.tbl tbody tr:hover td{background:rgba(255,138,31,.05)}
.tbl td:first-child{font:500 13.5px var(--mono);color:var(--or);white-space:nowrap}
.tbl.pins td:first-child{text-align:right;width:3.5em}
.tbl.pins td:nth-child(3){width:42%}
.tbl.plug td:first-child,.tbl.conn td:first-child{width:1%}
.tbl.conn td:nth-child(2){font-family:var(--mono);font-size:13px;white-space:nowrap}
.tbl tr.sub td{font:12.5px var(--mono);color:var(--muted);padding-top:0;border-top:0}
.tbl tr.sub td:first-child{color:var(--muted);text-align:right;font-size:12px}
.tbl tr:has(+tr.sub) td{border-bottom-color:transparent}
.ty{width:1%;white-space:nowrap}
.ty span,.legend i{display:inline-block;min-width:44px;text-align:center;font:500 11.5px/1 var(--mono);letter-spacing:.04em;padding:4px 6px;border:1px solid currentColor;border-radius:2px}
.t-out{color:var(--or)}
.t-in{color:var(--in)}
.t-gnd{color:var(--gnd)}
.t-mix{color:#e3c58f}

.top{margin:28px 0 0;text-align:right}
.top a{font:12px var(--mono);color:var(--muted);text-decoration:none;letter-spacing:.06em;text-transform:uppercase}
.top a::before{content:"↑ "}
.top a:hover{color:var(--or)}

/* example projects */
.projects{padding-block:clamp(44px,6vw,72px);position:relative;z-index:1}
.sh{display:flex;flex-wrap:wrap;justify-content:space-between;align-items:end;gap:12px;margin-bottom:24px}
.sh h2,.contact h2{font:700 26px var(--display);text-transform:uppercase;letter-spacing:.02em;margin:0}
.sh p{margin:0;font-size:15px}
.sh a{color:var(--muted);text-decoration:none}
.sh a:hover{color:var(--or)}
.pfgrid{display:grid;grid-template-columns:repeat(3,1fr);gap:22px}
.pf{text-decoration:none;display:block}
.pf figure{position:relative;margin:0;border:1px solid var(--line);background:var(--panel);padding:8px;height:100%;display:flex;flex-direction:column;transition:border-color .15s,transform .15s}
.pf img{display:block;width:100%;height:auto;aspect-ratio:13/7;object-fit:cover}
.pf figcaption{display:flex;flex-direction:column;gap:4px;padding:12px 4px 4px}
.pf figcaption b{font:500 12px var(--mono);color:var(--or);text-transform:uppercase;letter-spacing:.04em}
.pf figcaption span{font-size:14.5px;color:#c9ccd1}
.pf:hover figure{border-color:var(--or);transform:translateY(-2px)}

/* contact + footer */
.contact{border-top:1px solid var(--line);position:relative;z-index:1;background:rgba(18,20,22,.6)}
.contact .wrap{display:grid;grid-template-columns:1fr 1fr;gap:32px;padding-block:48px;align-items:center}
.contact h2{margin-bottom:10px}
.contact p{color:var(--muted);margin:0}
.mail{font:500 clamp(22px,3vw,32px) var(--mono);color:var(--or);text-decoration:none}
address{font-style:normal;color:var(--muted);font-size:14px;margin-top:8px;line-height:1.7}
.contact .btns{margin-top:18px}
footer{border-top:1px solid var(--line);font:12px var(--mono);color:var(--muted)}
footer .wrap{display:flex;flex-wrap:wrap;justify-content:space-between;gap:10px;padding-block:18px}
footer a{text-decoration:none}
footer a:hover{color:var(--or)}

/* lightbox */
.lb{border:1px solid var(--line);background:var(--panel);color:var(--ink);padding:10px;max-width:min(1100px,94vw);max-height:94vh}
.lb::backdrop{background:rgba(0,0,0,.82)}
.lb img{display:block;max-width:100%;max-height:80vh;margin:auto}
.lb p{margin:10px 2px 2px;font:13px var(--mono);color:var(--muted)}
.lb-x{position:absolute;top:6px;right:6px;width:36px;height:36px;font:24px/1 var(--sans);color:var(--ink);background:rgba(18,20,22,.85);border:1px solid var(--line);cursor:pointer}
.lb-x:hover{border-color:var(--or);color:var(--or)}

/* responsive */
/* narrower screens: keep the computer layout (side by side), just tighter */
@media (max-width:1100px){
  .ecu-head{grid-template-columns:1fr minmax(250px,340px);gap:20px 28px}
}
@media (max-width:880px){
  .hexbg{font-size:11px;color:#2c3239;-webkit-mask-image:linear-gradient(90deg,transparent 0,#000 45%);mask-image:linear-gradient(90deg,transparent 0,#000 45%)}
  .hexbg b{color:#8f4f16}
  body{font-size:17px}
  /* phone menu: Menu button with dropdown (as before) */
  :root{--head-h:62px}
  .bar{flex-wrap:wrap;padding-block:10px}
  .menu-btn{display:inline-flex}
  /* same on-screen size as the Menu button on fekzen.se (14px at 70% zoom there; this layout is scaled ~61% on phones) */
  .menu-btn{font-size:16px;padding:10px 16px;gap:11px}
  .menu-btn .bars,.menu-btn .bars::before,.menu-btn .bars::after{width:21px}
  .menu-btn .bars::before{top:-7px}.menu-btn .bars::after{top:7px}
  .menu-btn[aria-expanded="true"] .bars::before{transform:translateY(7px) rotate(45deg)}
  .menu-btn[aria-expanded="true"] .bars::after{transform:translateY(-7px) rotate(-45deg)}
  .ecunav{display:none;width:100%;margin:0 0 4px;grid-template-columns:repeat(2,1fr);gap:6px;max-height:calc(100vh - 80px);overflow:auto}
  .ecunav.open{display:grid}
  .ecunav a{padding:15px 18px;gap:7px}
  /* same on-screen size as the menu text on fekzen.se */
  .ecunav a b{font-size:17.2px}
  .ecunav a span{font-size:15px}
  .hero-img figcaption{flex-direction:column;gap:2px}
  .hero .wrap{grid-template-columns:1.35fr .65fr;gap:24px;padding-block:36px}
  .hero .wrap{align-items:start}
  .hero-img{margin-top:34px} /* top of the picture lines up with the headline */
  h1{font-size:40px;margin-bottom:18px}
  .hero .lead{font-size:18px}
  .hero .warn{font-size:13.5px}
  .ecu h2{font-size:26px}
  .ecu .ex{font-size:13.5px}
  .toc a{font-size:14.5px;padding:10px 10px;gap:10px;grid-template-columns:24px 1fr auto}
  .toc svg{width:22px;height:22px}
  .blk h3{font-size:18px}
  .tbl{font-size:15px}
  .tbl th,.tbl td{padding:7px 9px}
  .tbl.pins td:nth-child(3){width:38%}
  .pfgrid{gap:12px}
  .pf figcaption span{font-size:14px}
  .contact .wrap{gap:20px}
}
@media (prefers-reduced-motion:reduce){html{scroll-behavior:auto}*{transition:none!important}}
@media print{.hexbg,header.site,.legend,.top,.projects,.lb{display:none}body{background:#fff;color:#000}.tw{border-color:#999}}

/* ---------- marine guide ---------- */
.blk .lead-in{margin:0 0 12px;color:#c9ccd1;font-size:15px}
.note{margin:0 0 6px;padding:12px 16px;border:1px solid var(--line);border-left:3px solid var(--or);background:rgba(18,20,22,.94);font-size:14.5px;line-height:1.6;color:#c9ccd1;max-width:90ch}
.note b{color:var(--or);font-family:var(--display);letter-spacing:.06em;margin-right:2px}
.tbl.models td:first-child{width:1%}
.tbl.plug td:nth-child(2){width:40%}