/* Layout: engineering-sheet grid. Dark ink ground like a control room, brass like a stamped nameplate, steel-blue drafting lines. */
:root{
  --bg:#0c1117; --bg2:#10171f; --panel:#151d27; --line:#26323f; --line2:#334252;
  --fg:#e6ebef; --mute:#93a1ae; --brass:#d0a963; --brass-ink:#1b1408; --steel:#7896b1;
  --ok:#6fbf8e;
  --f-display:"Archivo","Noto Sans SC","Helvetica Neue",Arial,sans-serif;
  --f-body:"IBM Plex Sans","Noto Sans SC","Helvetica Neue",Arial,sans-serif;
  --f-mono:"IBM Plex Mono","Noto Sans SC",ui-monospace,Menlo,Consolas,monospace;
  --s1:.75rem; --s2:.875rem; --s3:1rem; --s4:1.25rem; --s5:1.75rem; --s6:2.5rem; --s7:clamp(2.2rem,5.2vw,4.1rem);
  --wrap:1200px; --r:4px;
  color-scheme:dark;
}
@media (prefers-color-scheme: light){
  :root:not([data-theme="dark"]){
    --bg:#f1f2ef; --bg2:#e8eae6; --panel:#ffffff; --line:#d2d7da; --line2:#bcc4ca;
    --fg:#111820; --mute:#55616d; --brass:#8a6727; --brass-ink:#ffffff; --steel:#3d5a75; --ok:#2f7d50;
    color-scheme:light;
  }
}
:root[data-theme="light"]{
  --bg:#f1f2ef; --bg2:#e8eae6; --panel:#ffffff; --line:#d2d7da; --line2:#bcc4ca;
  --fg:#111820; --mute:#55616d; --brass:#8a6727; --brass-ink:#ffffff; --steel:#3d5a75; --ok:#2f7d50;
  color-scheme:light;
}
*{box-sizing:border-box}
[hidden]{display:none!important}
html{scroll-behavior:smooth}
body{background:var(--bg);color:var(--fg);font-family:var(--f-body);font-size:var(--s3);line-height:1.6;-webkit-font-smoothing:antialiased}
a{color:inherit}
button,input,select,textarea{font:inherit;color:inherit}
:focus-visible{outline:2px solid var(--brass);outline-offset:2px}
.wrap{max-width:var(--wrap);margin-inline:auto;padding-inline:clamp(16px,4vw,40px)}
h1,h2,h3{font-family:var(--f-display);font-stretch:85%;line-height:1.08;letter-spacing:-.01em;text-wrap:balance;margin:0}
h1{font-size:var(--s7);font-weight:700}
h2{font-size:clamp(1.6rem,3vw,2.3rem);font-weight:700}
h3{font-size:var(--s4);font-weight:600;font-stretch:90%}
p{margin:0}
.eyebrow{font-family:var(--f-mono);font-size:var(--s1);letter-spacing:.12em;text-transform:uppercase;color:var(--brass)}
html[lang^="zh"] .eyebrow{letter-spacing:.04em}
.lead{font-size:1.125rem;color:var(--mute);max-width:62ch}
.mute{color:var(--mute)}
.mono{font-family:var(--f-mono)}

/* Header */
.hdr{position:sticky;top:env(safe-area-inset-top,0px);z-index:40;background:color-mix(in srgb,var(--bg) 88%,transparent);backdrop-filter:blur(10px);border-bottom:1px solid var(--line)}
.hdr .wrap{display:flex;align-items:center;gap:1.5rem;min-height:64px}
.logo{display:flex;align-items:baseline;gap:.5rem;text-decoration:none;flex-shrink:0}
.logo b{font-family:var(--f-display);font-stretch:125%;font-weight:800;font-size:1.35rem;letter-spacing:.06em}
.logo b i{font-style:normal;color:var(--brass)}
.logo span{font-family:var(--f-mono);font-size:.68rem;letter-spacing:.14em;color:var(--mute);text-transform:uppercase}
.nav{display:flex;gap:.25rem;margin-left:auto;align-items:center}
.nav a{text-decoration:none;padding:.45rem .7rem;border-radius:var(--r);font-size:var(--s2);color:var(--mute)}
.nav a:hover{color:var(--fg)}
.nav a[aria-current="page"]{color:var(--fg);box-shadow:inset 0 -2px 0 var(--brass);border-radius:0}
.lang{display:flex;border:1px solid var(--line2);border-radius:var(--r);overflow:hidden;flex-shrink:0}
.lang button{background:none;border:0;padding:.35rem .6rem;font-size:.78rem;font-family:var(--f-mono);cursor:pointer;color:var(--mute)}
.lang button[aria-pressed="true"]{background:var(--fg);color:var(--bg)}
.btn{display:inline-flex;align-items:center;gap:.5rem;justify-content:center;padding:.75rem 1.2rem;border-radius:var(--r);font-weight:600;font-size:var(--s2);text-decoration:none;cursor:pointer;border:1px solid transparent;white-space:nowrap}
.btn-p{background:var(--brass);color:var(--brass-ink)}
.btn-p:hover{filter:brightness(1.08)}
.btn-g{border-color:var(--line2);color:var(--fg);background:transparent}
.btn-g:hover{border-color:var(--fg)}
.btn-sm{padding:.5rem .85rem}
.burger{display:none;background:none;border:1px solid var(--line2);border-radius:var(--r);padding:.45rem .6rem;cursor:pointer}
.burger svg{display:block}
@media (max-width:980px){
  .nav{position:absolute;left:0;right:0;top:100%;flex-direction:column;align-items:stretch;background:var(--bg);border-bottom:1px solid var(--line);padding:.5rem clamp(16px,4vw,40px) 1rem;gap:0;display:none;margin:0}
  .nav.open{display:flex}
  .nav a{padding:.8rem 0;border-bottom:1px solid var(--line);font-size:var(--s3)}
  .nav a[aria-current="page"]{box-shadow:none;color:var(--brass)}
  .burger{display:block;margin-left:auto}
  .hdr .cta-top{display:none}
}

/* Pages */
main{min-height:60vh}
.sec{padding-block:clamp(3rem,7vw,5.5rem)}
.sec+.sec{border-top:1px solid var(--line)}
.sec-head{display:grid;gap:.75rem;margin-bottom:2.25rem;max-width:760px}
.page-head{padding-block:clamp(2.5rem,6vw,4.5rem) 2rem;border-bottom:1px solid var(--line);background:
  linear-gradient(var(--line) 1px,transparent 1px) 0 0/40px 40px,
  linear-gradient(90deg,var(--line) 1px,transparent 1px) 0 0/40px 40px;background-color:var(--bg2);background-blend-mode:normal}
.page-head .wrap{display:grid;gap:.9rem}
.page-head h1{font-size:clamp(2rem,4.4vw,3.2rem)}

/* Hero */
.hero{position:relative;overflow:hidden;border-bottom:1px solid var(--line)}
.hero::before{content:"";position:absolute;inset:0;background:
  linear-gradient(var(--line) 1px,transparent 1px) 0 0/48px 48px,
  linear-gradient(90deg,var(--line) 1px,transparent 1px) 0 0/48px 48px;opacity:.45;pointer-events:none;
  mask-image:linear-gradient(90deg,transparent,#000 55%);-webkit-mask-image:linear-gradient(90deg,transparent,#000 55%)}
.hero .wrap{position:relative;display:grid;grid-template-columns:1.1fr .9fr;gap:clamp(2rem,5vw,4rem);align-items:center;padding-block:clamp(3rem,7vw,5.5rem)}
.hero-copy{display:grid;gap:1.4rem;min-width:0}
.hero-ctas{display:flex;flex-wrap:wrap;gap:.75rem;margin-top:.4rem}
.stats{display:grid;grid-template-columns:repeat(3,minmax(0,1fr));gap:1.25rem;margin:1rem 0 0;padding-top:1.25rem;border-top:1px solid var(--line)}
.stats > div{min-width:0;display:grid;gap:.25rem;align-content:start}
.stats dt{font-family:var(--f-display);font-stretch:110%;font-weight:700;font-size:clamp(1.6rem,3vw,2.2rem);line-height:1;color:var(--brass);font-variant-numeric:tabular-nums}
.stats dd{margin:0;font-size:.82rem;color:var(--mute);line-height:1.4}
@media (max-width:420px){.stats{gap:.75rem}.stats dd{font-size:.75rem}}
.hero-art{position:relative;min-width:0;display:grid;gap:1rem}
.hero-art canvas{width:100%;max-width:100%;aspect-ratio:1/1;display:block}
.plate{position:relative;border:1px solid var(--brass);border-radius:6px;padding:1rem 1.1rem;background:color-mix(in srgb,var(--brass) 7%,var(--panel));font-family:var(--f-mono);font-size:.8rem}
.plate::before,.plate::after{content:"";position:absolute;width:7px;height:7px;border-radius:50%;background:var(--brass);top:8px;opacity:.8}
.plate::before{left:8px}.plate::after{right:8px}
.plate h4{margin:0 0 .6rem;text-align:center;font-family:var(--f-display);font-stretch:110%;letter-spacing:.14em;font-size:.78rem;color:var(--brass);text-transform:uppercase}
html[lang^="zh"] .plate h4{letter-spacing:.06em}
.plate dl{display:grid;grid-template-columns:auto 1fr;gap:.35rem .9rem;margin:0}
.plate dt{color:var(--mute);font-size:.72rem;letter-spacing:.06em;text-transform:uppercase;white-space:nowrap}
.plate dd{margin:0;border-bottom:1px dashed var(--line2);min-height:1.2em;color:var(--fg)}
.plate p{margin-top:.7rem;font-family:var(--f-body);font-size:.8rem;color:var(--mute)}
.hero-art .plate{position:absolute;right:0;bottom:4%;width:min(300px,78%)}
@media (max-width:880px){
  .hero .wrap{grid-template-columns:1fr}
  .hero-art{max-width:460px;width:100%;margin-inline:auto}
}

/* Equipment tiles */
.tiles{display:grid;grid-template-columns:repeat(4,minmax(0,1fr));border-top:1px solid var(--line);border-left:1px solid var(--line)}
.tile{border-right:1px solid var(--line);border-bottom:1px solid var(--line);padding:1.4rem 1.25rem 1.25rem;display:grid;gap:.55rem;text-decoration:none;align-content:start;min-height:170px;transition:background .2s}
.tile:hover{background:var(--panel)}
.tile .std{font-family:var(--f-mono);font-size:.72rem;color:var(--steel)}
.tile h3{font-size:1.15rem}
.tile .cnt{font-size:var(--s2);color:var(--mute);margin-top:auto}
.tile .arr{color:var(--brass)}
@media (max-width:900px){.tiles{grid-template-columns:repeat(2,minmax(0,1fr))}}
@media (max-width:440px){.tiles{grid-template-columns:1fr}.tile{min-height:0}}

/* Brands */
.brands{display:grid;grid-template-columns:repeat(3,minmax(0,1fr));gap:1px;background:var(--line);border:1px solid var(--line)}
.brand{background:var(--bg);padding:1.3rem 1.2rem;display:grid;gap:.4rem;text-decoration:none;align-content:start}
a.brand:hover{background:var(--panel)}
#brandsFull{grid-template-columns:repeat(5,minmax(0,1fr))}
@media (max-width:1100px){#brandsFull{grid-template-columns:repeat(2,minmax(0,1fr))}}
@media (max-width:700px){.brands{grid-template-columns:repeat(2,minmax(0,1fr))}}
@media (max-width:460px){.brands,#brandsFull{grid-template-columns:1fr}.logo span{display:none}.hdr .wrap{gap:.75rem}}
.brand b{font-family:var(--f-display);font-stretch:100%;font-weight:700;font-size:1.2rem;letter-spacing:.01em}
.brand span{font-size:var(--s2);color:var(--mute);line-height:1.45}
.brand .see{font-size:var(--s1);font-family:var(--f-mono);color:var(--brass);margin-top:.35rem}
.disclaimer{margin-top:1.1rem;font-size:var(--s1);color:var(--mute);max-width:80ch}

/* Steps */
.steps{display:grid;grid-template-columns:repeat(3,minmax(0,1fr));gap:2rem 2.5rem;counter-reset:st;list-style:none;margin:0;padding:0}
.steps li{display:grid;gap:.5rem;padding-top:1rem;border-top:2px solid var(--line2);min-width:0}
.steps li::before{counter-increment:st;content:counter(st,decimal-leading-zero);font-family:var(--f-mono);font-size:var(--s1);color:var(--brass)}
.steps li p{color:var(--mute);font-size:var(--s2)}
@media (max-width:820px){.steps{grid-template-columns:repeat(2,minmax(0,1fr))}}
@media (max-width:520px){.steps{grid-template-columns:1fr}}

/* Split / features */
.split{display:grid;grid-template-columns:1fr 1.4fr;gap:clamp(2rem,5vw,4rem);align-items:start}
.split > *{min-width:0}
@media (max-width:860px){.split{grid-template-columns:1fr}}
.feats{display:grid;grid-template-columns:repeat(2,minmax(0,1fr));gap:1.75rem 2rem}
.feat{display:grid;gap:.4rem;min-width:0}
.feat h3{font-size:1.1rem}
.feat p{color:var(--mute);font-size:var(--s2)}
.feat .ic{width:34px;height:34px;border:1px solid var(--line2);border-radius:var(--r);display:grid;place-items:center;color:var(--brass);margin-bottom:.3rem}
@media (max-width:560px){.feats{grid-template-columns:1fr}}

/* Industries */
.inds{display:grid;grid-template-columns:repeat(3,minmax(0,1fr));gap:1px;background:var(--line);border:1px solid var(--line)}
.ind{background:var(--bg);padding:1.4rem 1.25rem;display:grid;gap:.45rem;align-content:start}
.ind p{color:var(--mute);font-size:var(--s2)}
.ind .tag{font-family:var(--f-mono);font-size:.7rem;color:var(--steel);letter-spacing:.08em;text-transform:uppercase}
@media (max-width:860px){.inds{grid-template-columns:repeat(2,minmax(0,1fr))}}
@media (max-width:520px){.inds{grid-template-columns:1fr}}

/* CTA band */
.band{background:var(--panel);border-block:1px solid var(--line)}
.band .wrap{display:flex;flex-wrap:wrap;align-items:center;justify-content:space-between;gap:1.5rem;padding-block:2.5rem}
.band h2{font-size:clamp(1.4rem,2.6vw,1.9rem);max-width:28ch}

/* Catalog */
.cat-bar{display:grid;gap:1rem;margin-bottom:1.75rem}
.chips{display:flex;flex-wrap:wrap;gap:.45rem}
.chip{border:1px solid var(--line2);background:transparent;border-radius:999px;padding:.38rem .8rem;font-size:.82rem;cursor:pointer;color:var(--mute)}
.chip:hover{color:var(--fg);border-color:var(--fg)}
.chip[aria-pressed="true"]{background:var(--fg);color:var(--bg);border-color:var(--fg)}
.filters{display:flex;flex-wrap:wrap;gap:.75rem;align-items:center}
.field-inline{display:flex;align-items:center;gap:.5rem;font-size:var(--s2);color:var(--mute)}
.inp{background:var(--bg2);border:1px solid var(--line2);border-radius:var(--r);padding:.6rem .75rem;min-width:0}
.inp:focus{border-color:var(--brass);outline:none}
#q{width:min(320px,100%)}
.count{font-family:var(--f-mono);font-size:var(--s1);color:var(--mute);margin-left:auto}
.grid-parts{display:grid;grid-template-columns:repeat(auto-fill,minmax(280px,1fr));gap:1rem}
.part{border:1px solid var(--line);border-radius:6px;background:var(--panel);padding:1.15rem 1.15rem 1rem;display:grid;gap:.6rem;text-align:left;cursor:pointer;align-content:start;transition:border-color .2s,transform .2s}
.part:hover{border-color:var(--brass)}
.part .row{display:flex;justify-content:space-between;gap:.75rem;font-family:var(--f-mono);font-size:.72rem;color:var(--steel)}
.part h3{font-size:1.08rem}
.part p{font-size:var(--s2);color:var(--mute);line-height:1.5}
.part .brs{display:flex;flex-wrap:wrap;gap:.3rem;margin-top:.15rem}
.bdg{font-size:.7rem;font-family:var(--f-mono);border:1px solid var(--line2);border-radius:3px;padding:.1rem .4rem;color:var(--mute)}
.empty{padding:2.5rem;border:1px dashed var(--line2);border-radius:6px;text-align:center;color:var(--mute)}

/* Drawer */
.scrim{position:fixed;inset:0;background:rgba(5,8,12,.55);z-index:60}
.drawer{position:fixed;top:0;right:0;bottom:0;width:min(480px,100%);background:var(--bg);border-left:1px solid var(--line);z-index:61;overflow-y:auto;padding:calc(1.5rem + env(safe-area-inset-top,0px)) 1.5rem calc(1.5rem + env(safe-area-inset-bottom,0px));display:grid;gap:1.25rem;align-content:start}
.drawer .x{justify-self:end;background:none;border:1px solid var(--line2);border-radius:var(--r);padding:.3rem .6rem;cursor:pointer;color:var(--mute)}
.drawer h2{font-size:1.7rem}
.kv{display:grid;grid-template-columns:auto 1fr;gap:.5rem 1rem;font-size:var(--s2);margin:0}
.kv dt{color:var(--mute)}
.kv dd{margin:0}
.need{margin:0;padding-left:1.1rem;color:var(--fg);font-size:var(--s2);display:grid;gap:.3rem}

/* Services */
.svc{display:grid;grid-template-columns:220px 1fr;gap:1.5rem;padding-block:1.75rem;border-top:1px solid var(--line)}
.svc:last-child{border-bottom:1px solid var(--line)}
.svc .k{font-family:var(--f-mono);font-size:var(--s1);color:var(--brass);letter-spacing:.08em;text-transform:uppercase;padding-top:.3rem}
.svc .b{display:grid;gap:.6rem;min-width:0}
.svc ul{margin:.2rem 0 0;padding-left:1.1rem;color:var(--mute);font-size:var(--s2);display:grid;gap:.25rem}
@media (max-width:700px){.svc{grid-template-columns:1fr;gap:.6rem}}

/* About */
.facts{border:1px solid var(--line);border-radius:6px;background:var(--panel);padding:1.25rem 1.4rem}
.facts dl{display:grid;grid-template-columns:auto 1fr;gap:.75rem 1.5rem;margin:0;font-size:var(--s2)}
.facts dt{color:var(--mute)}
.facts dd{margin:0;font-variant-numeric:tabular-nums}
.prose{display:grid;gap:1.1rem;max-width:66ch}
.prose p{color:var(--fg)}
.prose p.mute{color:var(--mute)}

/* RFQ */
.rfq{display:grid;grid-template-columns:1.5fr 1fr;gap:clamp(1.5rem,4vw,3rem);align-items:start}
.rfq > *{min-width:0}
@media (max-width:900px){.rfq{grid-template-columns:1fr}}
form{display:grid;gap:1.1rem}
.fgrid{display:grid;grid-template-columns:repeat(2,minmax(0,1fr));gap:1rem}
@media (max-width:560px){.fgrid{grid-template-columns:1fr}}
.f{display:grid;gap:.35rem;min-width:0}
.f label{font-size:.82rem;color:var(--mute)}
.f label .req{color:var(--brass)}
.f .inp{width:100%}
textarea.inp{min-height:130px;resize:vertical;font-family:var(--f-mono);font-size:.85rem;line-height:1.5}
.hint{font-size:.76rem;color:var(--mute)}
.err{font-size:.78rem;color:#e07a6a}
fieldset{border:0;padding:0;margin:0;display:grid;gap:1rem}
legend{font-family:var(--f-mono);font-size:var(--s1);letter-spacing:.1em;text-transform:uppercase;color:var(--brass);margin-bottom:.4rem;padding:0}
.aside{display:grid;gap:1rem;position:sticky;top:calc(80px + env(safe-area-inset-top,0px))}
.card{border:1px solid var(--line);border-radius:6px;background:var(--panel);padding:1.2rem 1.25rem;display:grid;gap:.7rem}
.card h3{font-size:1.05rem}
.card ul{margin:0;padding-left:1.1rem;font-size:var(--s2);color:var(--mute);display:grid;gap:.3rem}
.copyline{display:flex;flex-wrap:wrap;gap:.5rem;align-items:center}
.copyline code{font-family:var(--f-mono);font-size:.9rem;user-select:all;background:var(--bg2);border:1px solid var(--line);padding:.35rem .55rem;border-radius:3px}
.done{border:1px solid var(--ok);border-radius:6px;padding:1.25rem;display:grid;gap:.9rem;background:color-mix(in srgb,var(--ok) 6%,var(--panel))}
.done pre{margin:0;max-height:300px;overflow:auto;background:var(--bg2);border:1px solid var(--line);border-radius:4px;padding:.9rem;font-family:var(--f-mono);font-size:.8rem;white-space:pre-wrap;word-break:break-word}
.files{font-size:.78rem;color:var(--mute);font-family:var(--f-mono)}
.file-picker{display:flex;flex-wrap:wrap;align-items:center;gap:.65rem}
.file-picker .files{flex:1 1 12rem;min-width:0;overflow-wrap:anywhere}

/* Footer */
footer{border-top:1px solid var(--line);background:var(--bg2);padding-block:3rem 2rem;margin-top:0}
.fcols{display:grid;grid-template-columns:1.4fr 1fr 1fr;gap:2rem}
.fcols > *{min-width:0}
.fcols h4{margin:0 0 .7rem;font-family:var(--f-mono);font-size:var(--s1);letter-spacing:.1em;text-transform:uppercase;color:var(--mute);font-weight:500}
.fcols ul{list-style:none;margin:0;padding:0;display:grid;gap:.4rem;font-size:var(--s2)}
.fcols a{text-decoration:none;color:var(--fg)}
.fcols a:hover{color:var(--brass)}
.fine{margin-top:2.5rem;padding-top:1.25rem;border-top:1px solid var(--line);display:grid;gap:.6rem;font-size:.75rem;color:var(--mute)}
@media (max-width:760px){.fcols{grid-template-columns:1fr}}

@media (prefers-reduced-motion: reduce){html{scroll-behavior:auto}*{transition:none!important}}

/* --- static-site additions --- */
.lang a{display:block;padding:.35rem .6rem;font-size:.78rem;font-family:var(--f-mono);text-decoration:none;color:var(--on-brand-mute,var(--mute))}
.lang a[aria-current="true"]{background:#fff;color:var(--brand-deep,#111)}
.part{cursor:default;text-align:start}
a.part{text-decoration:none;cursor:pointer}
.grp{display:grid;gap:1.1rem}
.grp+.grp{margin-top:3rem}
.grp h2 a{text-decoration:none}
.grp h2 a:hover{text-decoration:underline}
.kvline{display:flex;flex-wrap:wrap;gap:.4rem 1.2rem;font-size:var(--s2)}
.kvline b{font-weight:600}
.need-box{display:grid;gap:.6rem;margin-top:2.5rem;max-width:760px}
.need-box ul{margin:0;padding-inline-start:1.2rem;display:grid;gap:.3rem;color:var(--mute)}
.links{display:flex;flex-wrap:wrap;gap:.45rem}
.links a{border:1px solid var(--line2);border-radius:999px;padding:.38rem .8rem;font-size:.85rem;text-decoration:none;color:var(--mute)}
.links a:hover{color:var(--fg);border-color:var(--fg)}
.crumbs{font-size:.8rem;opacity:.85}
.crumbs a{text-decoration:none}
.crumbs a:hover{text-decoration:underline}
.mt{margin-top:2.5rem}
.nf{padding-block:5rem;display:grid;gap:1rem}
[dir=rtl] .eyebrow{unicode-bidi:plaintext;text-align:right}
.fh{margin:0 0 .7rem;font-family:var(--f-mono);font-size:var(--s1);letter-spacing:.1em;text-transform:uppercase;color:var(--on-brand-mute,var(--mute));font-weight:500}

.lang a{color:var(--mute)} .lang a[aria-current="true"]{background:var(--brass);color:var(--brass-ink)}
.fh{margin:0 0 .7rem;font-family:var(--f-mono);font-size:var(--s1);letter-spacing:.1em;text-transform:uppercase;color:var(--mute);font-weight:500}