/* Layout: engineering datasheet — dark instrument-panel bands, category sheets, spec tables */
:root{
  --bg:#f5f6f4; --surface:#ffffff; --ink:#14201f; --muted:#47524f;
  --line:#d6dcda; --accent:#b8692e; --accent-ink:#ffffff; --panel:#0f1b1c; --panel-ink:#dfe7e5; --panel-muted:#a9b9b6; --trace:#e08a45;
  --f-display:"IBM Plex Sans KR",system-ui,sans-serif;
  --f-body:"IBM Plex Sans KR","Apple SD Gothic Neo","Malgun Gothic",system-ui,sans-serif;
  --f-mono:"IBM Plex Mono",ui-monospace,Menlo,monospace;
  padding-top:env(safe-area-inset-top,0px); padding-bottom:env(safe-area-inset-bottom,0px);
}
@media (prefers-color-scheme: dark){:root:not([data-theme="light"]){
  --bg:#0c1415; --surface:#132022; --ink:#e4ecea; --muted:#a8b6b3;
  --line:#26383a; --accent:#e08a45; --accent-ink:#1a0f06; --panel:#081011; --panel-ink:#dfe7e5; --panel-muted:#93a3a0; --trace:#f0a066; color-scheme:dark}}
:root[data-theme="dark"]{
  --bg:#0c1415; --surface:#132022; --ink:#e4ecea; --muted:#a8b6b3;
  --line:#26383a; --accent:#e08a45; --accent-ink:#1a0f06; --panel:#081011; --panel-ink:#dfe7e5; --panel-muted:#93a3a0; --trace:#f0a066; color-scheme:dark}
*{box-sizing:border-box}
html{scroll-padding-top:72px}
body{margin:0;background:var(--bg);color:var(--ink);font-family:var(--f-body);font-size:16px;font-weight:400;line-height:1.7;word-break:keep-all;-webkit-font-smoothing:antialiased;-moz-osx-font-smoothing:grayscale;text-rendering:optimizeLegibility}
img{max-width:100%}
[hidden]{display:none!important}
.wrap{max-width:1080px;margin:0 auto;padding-left:max(16px,env(safe-area-inset-left,0px));padding-right:max(16px,env(safe-area-inset-right,0px))}
a{color:inherit}
:focus-visible{outline:2px solid var(--accent);outline-offset:3px}
.eyebrow{font-family:var(--f-mono);font-size:12px;letter-spacing:.16em;text-transform:uppercase;color:var(--accent)}

/* header */
header.top{background:var(--panel);color:var(--panel-ink);position:sticky;top:env(safe-area-inset-top,0px);z-index:5;border-bottom:1px solid #ffffff14}
header.top .wrap{display:flex;align-items:center;justify-content:space-between;gap:16px;padding-block:14px;flex-wrap:wrap}
.logo{font-family:var(--f-mono);font-weight:500;letter-spacing:.2em;font-size:15px;text-decoration:none}
.logo b{color:var(--trace);font-weight:500}
nav{display:flex;gap:20px;font-size:14px;flex-wrap:wrap}
nav a{text-decoration:none;opacity:.8}
nav a:hover,nav a[aria-current="page"]{opacity:1;color:var(--trace)}
nav a.cta{opacity:1;color:var(--trace);font-weight:600}

/* home hero */
.hero{background:var(--panel);color:var(--panel-ink)}
.hero .wrap{padding-block:56px 40px;display:grid;gap:28px}
.hero .eyebrow{color:var(--trace)}
.hero h1{font-family:var(--f-display);font-weight:600;font-size:clamp(28px,5vw,48px);line-height:1.25;margin:0;text-wrap:balance;max-width:18em}
.hero p{margin:0;max-width:36em;color:var(--panel-muted);font-size:17px}
.trace{width:100%;height:90px;display:block}
.hero-meta{display:flex;flex-wrap:wrap;gap:10px 28px;font-family:var(--f-mono);font-size:13px;color:var(--panel-muted);border-top:1px solid #ffffff1c;padding-top:18px}
.hero-meta b{color:var(--panel-ink);font-weight:500}
@media (prefers-reduced-motion:no-preference){
  .trace path.sig{stroke-dasharray:1400;stroke-dashoffset:1400;animation:draw 2.2s ease-out .2s forwards}
  @keyframes draw{to{stroke-dashoffset:0}}
}

section{padding-block:64px}
.sec-head{display:grid;gap:8px;margin-bottom:32px}
.sec-head h2{font-size:clamp(24px,3.4vw,32px);margin:0;font-weight:600;text-wrap:balance}
.sec-head p{margin:0;color:var(--muted);max-width:40em}

/* category cards (home) */
.cats{display:grid;gap:20px}
.cat{background:var(--surface);border:1px solid var(--line);border-radius:6px;display:grid;grid-template-columns:200px 1fr;overflow:hidden}
.cat-side{background:var(--panel);color:var(--panel-ink);padding:24px;display:flex;flex-direction:column;justify-content:space-between;gap:16px}
.cat-code{font-family:var(--f-mono);font-size:12px;letter-spacing:.14em;color:var(--trace)}
.cat-side h3{margin:0;font-size:28px;font-weight:600;line-height:1.2}
.cat-side small{font-family:var(--f-mono);font-size:12px;color:var(--panel-muted)}
.cat-body{padding:24px 28px;display:grid;gap:18px;min-width:0}
.cat-body > p{margin:0;color:var(--muted)}
.items{list-style:none;margin:0;padding:0;display:grid;grid-template-columns:repeat(auto-fit,minmax(220px,1fr));gap:10px 24px}
.items li{border-top:1px solid var(--line);padding-top:10px}
.items a{text-decoration:none;display:block}
.items a:hover strong{color:var(--accent)}
.items strong{display:block;font-weight:600}
.items span{font-size:14px;color:var(--muted)}
.more{font-weight:600;color:var(--accent);text-decoration:none;justify-self:start}
.more:hover{text-decoration:underline}
.chips{display:flex;flex-wrap:wrap;gap:8px}
.chip{font-family:var(--f-mono);font-size:12px;border:1px solid var(--line);border-radius:3px;padding:3px 8px;color:var(--muted)}
.chip.brand{border-color:var(--accent);color:var(--accent)}

.why{display:grid;grid-template-columns:repeat(auto-fit,minmax(240px,1fr));gap:28px}
.why > div{border-left:2px solid var(--accent);padding-left:16px}
.why .num{font-family:var(--f-mono);font-size:30px;font-weight:500;line-height:1.1}
.why h4{margin:6px 0 4px;font-size:16px}
.why p{margin:0;color:var(--muted);font-size:15px}

/* contact */
.contact{background:var(--surface);border-block:1px solid var(--line)}
.contact-grid{display:grid;grid-template-columns:1fr 1fr;gap:40px}
.contact dl{margin:0;display:grid;grid-template-columns:auto 1fr;gap:12px 20px}
.contact dt{font-family:var(--f-mono);font-size:12px;letter-spacing:.1em;text-transform:uppercase;color:var(--muted);padding-top:3px}
.contact dd{margin:0;min-width:0;overflow-wrap:anywhere}
.todo{background:color-mix(in srgb,var(--accent) 16%,transparent);padding:0 4px;border-radius:2px}
form{display:grid;gap:12px}
label{font-size:13px;font-weight:600;display:grid;gap:4px}
input,select,textarea{font:inherit;font-size:15px;padding:10px 12px;border:1px solid var(--line);border-radius:4px;background:var(--bg);color:var(--ink);width:100%}
textarea{min-height:110px;resize:vertical}
.row2{display:grid;grid-template-columns:1fr 1fr;gap:12px}
button,.btn{font:inherit;font-size:15px;font-weight:600;background:var(--accent);color:var(--accent-ink);border:0;border-radius:4px;padding:11px 18px;cursor:pointer;justify-self:start;text-decoration:none;display:inline-block}
button:hover,.btn:hover{filter:brightness(1.08)}
.note{font-size:13px;color:var(--muted);margin:0}
#out{font-size:14px;background:var(--bg);border:1px dashed var(--line);border-radius:4px;padding:12px;white-space:pre-wrap;margin:0;font-family:var(--f-body)}

/* detail pages */
.page-hero{background:var(--panel);color:var(--panel-ink)}
.page-hero .wrap{padding-block:40px 32px;display:grid;gap:14px}
.crumb{font-family:var(--f-mono);font-size:12px;color:var(--panel-muted)}
.crumb a{text-decoration:none}
.crumb a:hover{color:var(--trace)}
.page-hero .eyebrow{color:var(--trace)}
.page-hero h1{margin:0;font-weight:600;font-size:clamp(26px,4.4vw,40px);line-height:1.3;text-wrap:balance}
.page-hero p{margin:0;max-width:40em;color:var(--panel-muted)}
.toc{display:flex;flex-wrap:wrap;gap:8px;margin-top:8px}
.toc a{font-size:13px;text-decoration:none;border:1px solid #ffffff2a;border-radius:3px;padding:4px 10px;color:var(--panel-ink)}
.toc a:hover{border-color:var(--trace);color:var(--trace)}

.products{padding-block:24px 64px}
.prod{display:grid;grid-template-columns:minmax(0,1.3fr) minmax(0,1fr);gap:20px 40px;padding-block:40px;border-bottom:1px solid var(--line)}
.prod:last-child{border-bottom:0}
.prod-main{display:grid;gap:12px;align-content:start;min-width:0}
.prod-code{font-family:var(--f-mono);font-size:12px;letter-spacing:.12em;color:var(--accent)}
.prod h2{margin:0;font-weight:600;font-size:clamp(21px,2.8vw,26px);line-height:1.35;text-wrap:balance}
.prod p{margin:0;color:var(--muted);max-width:38em}
.prod ul.uses{margin:0;padding-left:18px;color:var(--muted)}
.prod ul.uses li{margin-block:2px}
.spec{background:var(--surface);border:1px solid var(--line);border-radius:6px;padding:20px;display:grid;gap:14px;align-content:start;min-width:0}
.spec h3{margin:0;font-family:var(--f-mono);font-size:12px;letter-spacing:.14em;text-transform:uppercase;color:var(--muted);font-weight:500}
.spec dl{margin:0;display:grid;grid-template-columns:auto 1fr;gap:8px 16px;font-size:15px}
.spec dt{color:var(--muted);font-size:14px}
.spec dd{margin:0;min-width:0}

.table-box{overflow-x:auto;border:1px solid var(--line);border-radius:6px;background:var(--surface)}
table{border-collapse:collapse;width:100%;min-width:560px;font-size:15px}
th,td{text-align:left;padding:10px 14px;border-bottom:1px solid var(--line);vertical-align:top}
th{font-family:var(--f-mono);font-size:12px;letter-spacing:.08em;text-transform:uppercase;color:var(--muted);font-weight:500;background:var(--bg)}
tr:last-child td{border-bottom:0}
td.num{font-family:var(--f-mono);font-variant-numeric:tabular-nums;white-space:nowrap}
.fine{font-size:13px;color:var(--muted);margin:10px 0 0}
.wide{grid-column:1/-1;display:grid;gap:16px;min-width:0}

.steps{list-style:none;margin:0;padding:0;display:grid;gap:12px;counter-reset:s}
.steps li{display:grid;grid-template-columns:32px 1fr;gap:12px;align-items:start;counter-increment:s}
.steps li::before{content:counter(s);font-family:var(--f-mono);font-size:13px;width:28px;height:28px;border-radius:50%;border:1px solid var(--accent);color:var(--accent);display:grid;place-items:center}
.steps strong{display:block}
.steps span{color:var(--muted);font-size:15px}

.chain{display:flex;flex-wrap:wrap;align-items:center;gap:8px;font-family:var(--f-mono);font-size:13px}
.chain span.node{border:1px solid var(--line);background:var(--surface);border-radius:4px;padding:8px 12px;color:var(--ink)}
.chain span.node.dut{border-color:var(--accent);color:var(--accent)}
.chain span.arr{color:var(--muted)}

.ask{background:var(--panel);color:var(--panel-ink)}
.ask .wrap{padding-block:40px;display:flex;flex-wrap:wrap;gap:16px 32px;align-items:center;justify-content:space-between}
.ask h2{margin:0;font-weight:600;font-size:22px}
.ask p{margin:4px 0 0;color:var(--panel-muted)}

footer{padding-block:28px;font-size:13px;color:var(--muted)}
footer .wrap{display:flex;flex-wrap:wrap;justify-content:space-between;gap:8px}

@media (max-width:720px){
  .cat{grid-template-columns:1fr}
  .cat-side{flex-direction:row;align-items:flex-end;flex-wrap:wrap}
  .contact-grid,.row2,.prod{grid-template-columns:1fr}
  nav{gap:14px}
}

/* v3 additions: figures, part numbers, family cards, sub navigation */
.toc a[aria-current="page"]{border-color:var(--trace);color:var(--trace)}
.fig{background:var(--surface);border:1px solid var(--line);border-radius:6px;padding:16px;overflow-x:auto}
.fig svg{display:block;width:100%;height:auto;min-width:520px}
.fig figcaption{font-size:13px;color:var(--muted);margin-top:8px}
figure{margin:0}
.fig .ln{stroke:var(--ink);fill:none;stroke-width:1.5}
.fig .ln2{stroke:var(--muted);fill:none;stroke-width:1;stroke-dasharray:4 3}
.fig .fill{fill:var(--line);stroke:var(--ink);stroke-width:1.2}
.fig .acc{fill:var(--accent);stroke:none}
.fig .accl{stroke:var(--accent);fill:none;stroke-width:2}
.fig .board{fill:color-mix(in srgb,var(--accent) 12%,var(--surface));stroke:var(--ink);stroke-width:1.2}
.fig text{fill:var(--ink);font-family:var(--f-mono);font-size:12px}
.fig text.m{fill:var(--muted);font-size:11px}
code.pn,.pn{font-family:var(--f-mono);font-size:.92em;background:var(--bg);border:1px solid var(--line);border-radius:3px;padding:1px 6px;white-space:nowrap}
td .pn{font-size:13px}
.fam{display:grid;grid-template-columns:repeat(auto-fit,minmax(240px,1fr));gap:16px}
.fam a{display:grid;gap:8px;align-content:start;background:var(--surface);border:1px solid var(--line);border-radius:6px;padding:20px;text-decoration:none}
.fam a:hover{border-color:var(--accent)}
.fam .prod-code{font-size:11px}
.fam strong{font-size:18px}
.fam span.d{color:var(--muted);font-size:14px}
.fam span.r{font-family:var(--f-mono);font-size:13px;color:var(--accent)}
.pn-guide{display:grid;gap:10px}
.pn-row{display:flex;flex-wrap:wrap;gap:6px;align-items:center;font-family:var(--f-mono);font-size:15px}
.pn-row b{border:1px solid var(--accent);color:var(--accent);border-radius:3px;padding:2px 8px;font-weight:500}
.pn-row i{color:var(--muted);font-style:normal}
.brandline{display:flex;flex-wrap:wrap;gap:8px 20px;font-size:14px;color:var(--panel-muted)}
.brandline b{color:var(--panel-ink);font-weight:600}
.fig text.k{font-family:var(--f-body);font-size:13px}

/* v4: photos and measured data */
.shot{margin:0;background:#fff;border:1px solid var(--line);border-radius:6px;overflow:hidden;display:grid;align-content:space-between}
.shot img{display:block;width:auto;height:auto;max-height:300px;object-fit:contain;background:#fff;margin:auto;padding:10px;box-sizing:border-box}
.shot figcaption{font-size:13px;color:var(--muted);padding:8px 12px;background:var(--surface);border-top:1px solid var(--line)}
.shot.tall img{max-height:420px}
.gallery{display:grid;grid-template-columns:repeat(auto-fit,minmax(240px,1fr));gap:14px}
.gallery.two{grid-template-columns:repeat(auto-fit,minmax(300px,1fr))}
.plot{margin:0;background:#fff;border:1px solid var(--line);border-radius:6px;overflow:hidden}
.plot img{display:block;width:100%;height:auto;margin:auto;image-rendering:auto}
.plot a.zoom{display:block;cursor:zoom-in;background:#fff}
.zoom-hint{font-style:normal;font-size:12px;color:var(--muted);opacity:.8}
.gallery.two:has(.plot){grid-template-columns:1fr}
.lb{position:fixed;inset:0;z-index:50;background:rgba(10,12,14,.94);overflow:auto;display:block;text-align:center;padding:56px 16px 24px;cursor:zoom-out}
.lb[hidden]{display:none}
.lb img{display:inline-block;max-width:none;width:auto;height:auto;background:#fff;border-radius:4px;vertical-align:middle}
@media (max-width:900px){.lb img{max-width:200%}}
.lb-x{position:fixed;top:12px;right:14px;font-size:28px;line-height:1;padding:6px 12px;background:#fff;color:#111;border-radius:4px}
.plot figcaption{font-size:13px;padding:10px 12px;background:var(--surface);border-top:1px solid var(--line);display:grid;gap:2px}
.plot figcaption b{font-size:14px;color:var(--ink)}
.plot figcaption span{color:var(--muted)}
.kv{display:flex;flex-wrap:wrap;gap:6px;margin-top:4px}
.kv span{font-family:var(--f-mono);font-size:12px;border:1px solid var(--line);border-radius:3px;padding:2px 6px;color:var(--ink)!important}
.prod-main > .shot{margin-bottom:4px}
.matrix td,.matrix th{text-align:center;padding:8px 6px}
.matrix td:first-child,.matrix th:first-child{text-align:left;font-family:var(--f-mono);font-size:13px}
.matrix td.y{color:var(--accent);font-weight:700}
.note-box{border-left:3px solid var(--accent);background:var(--surface);padding:12px 16px;font-size:14px;color:var(--muted);border-radius:0 6px 6px 0}
.fam a img{width:100%;height:130px;object-fit:contain;background:#fff;border-radius:4px;border:1px solid var(--line)}
.cat-side img{width:100%;max-height:120px;object-fit:contain;background:#fff;border-radius:4px;padding:6px}
@media (max-width:720px){.cat-side img{max-width:220px}}

/* contact channels */
.channels{display:flex;flex-wrap:wrap;gap:8px}
.ch{display:inline-flex;align-items:center;gap:6px;font:inherit;font-size:14px;font-weight:500;padding:8px 12px;border-radius:999px;border:1px solid var(--line);background:var(--surface);color:var(--ink);text-decoration:none;cursor:pointer;line-height:1}
.ch svg{width:16px;height:16px;flex:none}
.ch:hover{border-color:var(--accent)}
.ch-kakao{background:#fee500;color:#191600;border-color:#fee500}
.ch-wechat{background:#07c160;color:#fff;border-color:#07c160}
.ch-blog{background:#03a94d;color:#fff;border-color:#03a94d}
footer .foot{display:grid;gap:14px}
footer .foot-meta{display:flex;flex-wrap:wrap;justify-content:space-between;gap:8px}
.contact .channels{margin-top:16px}
.wx{position:fixed;inset:0;z-index:60;background:rgba(10,12,14,.7);display:grid;place-items:center;padding:16px}
.wx[hidden]{display:none}
.wx-box{position:relative;background:var(--surface);color:var(--ink);border-radius:8px;padding:24px;max-width:320px;width:100%;text-align:center;display:grid;gap:10px;justify-items:center}
.wx-box h3{margin:0}
.wx-box img{width:220px;height:220px;background:#fff;border-radius:4px}
.wx-x{position:absolute;top:8px;right:10px;font-size:22px;background:none;border:0;color:var(--muted);cursor:pointer;padding:4px 8px}
.copy{font-size:12px;padding:3px 8px;margin-left:4px}

.logo img{display:block;height:50px;width:auto}
@media (max-width:600px){.logo img{height:40px}}
.logo{position:relative;display:inline-block;color:var(--panel-ink);padding-bottom:6px}
.logo-ko{position:absolute;left:51%;top:calc(78% - 1px);font-family:var(--f-body);font-size:14px;font-weight:600;letter-spacing:1.15em;line-height:1;white-space:nowrap}
@media (max-width:600px){.logo-ko{font-size:11px}}