/* Nuocheng Trading — calm industrial / datasheet style. IBM Plex (SIL OFL), self-hosted. */
@font-face{font-family:"Plex Sans";src:url(../fonts/ibm-plex-sans-latin-400-normal.woff2) format("woff2");font-weight:400;font-display:swap}
@font-face{font-family:"Plex Sans";src:url(../fonts/ibm-plex-sans-latin-500-normal.woff2) format("woff2");font-weight:500;font-display:swap}
@font-face{font-family:"Plex Sans";src:url(../fonts/ibm-plex-sans-latin-600-normal.woff2) format("woff2");font-weight:600 700;font-display:swap}
@font-face{font-family:"Plex Mono";src:url(../fonts/ibm-plex-mono-latin-400-normal.woff2) format("woff2");font-weight:400;font-display:swap}
@font-face{font-family:"Plex Mono";src:url(../fonts/ibm-plex-mono-latin-500-normal.woff2) format("woff2");font-weight:500 600;font-display:swap}
:root{
  --ink:#0c1b2e;--text:#2b3a4e;--muted:#5a687b;--faint:#8794a5;
  --line:#dde3ea;--line2:#c9d2dc;--bg:#fff;--soft:#f5f7f9;--tint:#eaf3f4;
  --accent:#0d6e79;--accent-2:#095660;--accent-l:#5fb3bc;
  --sans:"Plex Sans",-apple-system,"Segoe UI",Roboto,Helvetica,Arial,sans-serif;
  --mono:"Plex Mono",ui-monospace,SFMono-Regular,Menlo,Consolas,monospace;
  --r:4px;--sec:104px;--gut:32px;
}
*,*::before,*::after{box-sizing:border-box}
html{scroll-behavior:smooth;-webkit-text-size-adjust:100%}
body{margin:0;font-family:var(--sans);font-size:17px;line-height:1.65;color:var(--text);background:var(--bg);-webkit-font-smoothing:antialiased;text-rendering:optimizeLegibility}
img{max-width:100%;height:auto;display:block}
a{color:var(--accent);text-underline-offset:3px;text-decoration-thickness:1px}
a:hover{color:var(--accent-2)}
h1,h2,h3,h4{color:var(--ink);font-weight:600;margin:0 0 .5em;letter-spacing:-.015em}
h1{font-size:clamp(2.1rem,1.2rem + 3vw,3.4rem);line-height:1.08;letter-spacing:-.025em}
h2{font-size:clamp(1.6rem,1.1rem + 1.5vw,2.25rem);line-height:1.15;letter-spacing:-.02em}
h3{font-size:1.15rem;line-height:1.35;letter-spacing:-.005em}
p{margin:0 0 1em}
strong{color:var(--ink);font-weight:600}
sub{font-size:.72em}
.wrap{max-width:1200px;margin:0 auto;padding:0 var(--gut)}
.skip{position:absolute;left:-999px;top:8px;background:var(--ink);color:#fff;padding:8px 14px;z-index:99}
.skip:focus{left:8px}
:focus-visible{outline:2px solid var(--accent);outline-offset:2px}

/* header */
.site-header{position:sticky;top:0;z-index:50;background:rgba(255,255,255,.96);backdrop-filter:saturate(1.4) blur(8px);border-bottom:1px solid var(--line)}
.nav{display:flex;align-items:center;justify-content:space-between;height:72px}
.brand{display:flex;align-items:center;gap:12px;text-decoration:none;color:var(--ink);font-weight:600;font-size:1.02rem;letter-spacing:-.01em;line-height:1.15}
.brand svg{width:34px;height:34px;flex:none}
.brand small{display:block;font-family:var(--mono);font-weight:400;font-size:.68rem;letter-spacing:.06em;text-transform:uppercase;color:var(--muted);margin-top:3px}
.menu{display:flex;align-items:center;gap:30px;list-style:none;margin:0;padding:0}
.menu a{color:var(--text);text-decoration:none;font-size:.95rem;font-weight:500;padding:6px 0;border-bottom:2px solid transparent}
.menu a:hover{color:var(--ink)}
.menu a[aria-current="page"]{color:var(--ink);border-bottom-color:var(--accent)}
.menu .btn{padding:10px 16px;font-size:.9rem;border-bottom:0;color:#fff}
.burger{display:none;background:none;border:1px solid var(--line);border-radius:var(--r);color:var(--ink);padding:7px;cursor:pointer}
.burger svg{width:22px;height:22px;display:block}

/* buttons */
.btn{display:inline-flex;align-items:center;justify-content:center;gap:8px;min-height:48px;padding:12px 22px;border-radius:var(--r);font-family:var(--sans);font-weight:500;font-size:1rem;line-height:1.2;text-decoration:none;border:1px solid transparent;cursor:pointer;transition:background .15s,border-color .15s,color .15s}
.btn-primary{background:var(--accent);color:#fff}
.btn-primary:hover{background:var(--accent-2);color:#fff}
.btn-ghost{background:transparent;color:var(--ink);border-color:var(--line2)}
.btn-ghost:hover{border-color:var(--ink);color:var(--ink)}
.btn-light{background:#fff;color:var(--ink)}
.btn-light:hover{background:var(--tint);color:var(--ink)}
.link-arrow{display:inline-flex;align-items:center;gap:8px;font-weight:500;text-decoration:none;color:var(--accent)}
.link-arrow::after{content:"→";transition:transform .15s}
.link-arrow:hover::after{transform:translateX(3px)}

/* type helpers */
.eyebrow{display:flex;align-items:center;gap:10px;font-family:var(--mono);font-size:.78rem;font-weight:500;letter-spacing:.08em;text-transform:uppercase;color:var(--accent);margin-bottom:18px}
.eyebrow::before{content:"";width:22px;height:2px;background:currentColor;flex:none}
.lead{font-size:1.15rem;line-height:1.6;color:var(--muted);max-width:640px}
.note{font-size:.9rem;color:var(--muted);line-height:1.6}
.meta{font-family:var(--mono);font-size:.76rem;letter-spacing:.04em;text-transform:uppercase;color:var(--faint);margin-bottom:10px}

/* sections */
section{padding:var(--sec) 0}
section.soft{background:var(--soft)}
section.tight{padding-top:0}
.section-head{max-width:720px;margin-bottom:52px}
.section-head .lead{margin-top:6px}
.section-head.row{max-width:none;display:flex;justify-content:space-between;align-items:flex-end;gap:32px}
.grid{display:grid;gap:28px}
.g2{grid-template-columns:repeat(2,1fr)}
.g3{grid-template-columns:repeat(3,1fr)}
.g4{grid-template-columns:repeat(4,1fr)}
.split{display:grid;grid-template-columns:1fr 1fr;gap:72px;align-items:center}
.split.top{align-items:start}
.split.rev>:first-child{order:2}

/* hero */
.hero{padding:72px 0 0;background:#fff}
.hero-grid{display:grid;grid-template-columns:1.02fr 1fr;gap:64px;align-items:center}
.hero h1{margin-bottom:22px;max-width:12ch}
.hero h1 span{color:var(--accent)}
.hero .lead{margin-bottom:32px}
.hero-cta{display:flex;flex-wrap:wrap;gap:12px}
.hero-media{margin:0}
.hero-media img{width:100%;aspect-ratio:4/3;object-fit:cover;object-position:46% 50%;border-radius:var(--r)}
.keydata{display:grid;grid-template-columns:repeat(5,1fr);margin:64px 0 0;padding:0;list-style:none;background:#fff;border:1px solid var(--line);border-radius:var(--r)}
.keydata li{padding:20px 22px;border-left:1px solid var(--line)}
.keydata li:first-child{border-left:0}
.keydata span{display:block;font-family:var(--mono);font-size:.7rem;letter-spacing:.07em;text-transform:uppercase;color:var(--faint);margin-bottom:6px}
.keydata b{display:block;font-weight:500;color:var(--ink);font-size:.98rem;line-height:1.35;font-variant-numeric:tabular-nums}
.hero+section{padding-top:var(--sec)}
.soft-band{background:var(--soft)}

/* page header */
.page-hero{padding:64px 0 56px;background:var(--soft);border-bottom:1px solid var(--line)}
.page-hero h1{max-width:20ch;margin-bottom:16px}
.page-hero .lead{margin-bottom:0}
.page-hero .hero-cta{margin-top:30px}
.page-hero .keydata{margin-top:40px;grid-template-columns:repeat(4,1fr)}
.crumbs{font-family:var(--mono);font-size:.76rem;letter-spacing:.03em;color:var(--faint);margin-bottom:28px}
.crumbs a{color:var(--muted);text-decoration:none}
.crumbs a:hover{color:var(--accent)}

/* figures */
.media{margin:0}
.media img{width:100%;aspect-ratio:4/3;object-fit:cover;border-radius:var(--r);background:var(--soft)}
figcaption,.tag{display:flex;align-items:center;gap:8px;margin-top:12px;font-family:var(--mono);font-size:.72rem;letter-spacing:.04em;color:var(--faint)}
figcaption::before{content:"";width:6px;height:6px;border:1px solid var(--faint);border-radius:50%;flex:none}

/* product cards */
.card{background:#fff;border:1px solid var(--line);border-radius:var(--r);padding:30px;display:flex;flex-direction:column;transition:border-color .2s}
.card:hover{border-color:var(--line2)}
.card h3{margin-bottom:10px}
.card p{color:var(--muted);margin-bottom:0}
.card.product{padding:0;overflow:hidden}
.card.product>img{aspect-ratio:16/10;object-fit:cover;width:100%;border-bottom:1px solid var(--line)}
.card .body{padding:30px 32px 32px;display:flex;flex-direction:column;flex:1}
.card .body p{margin-bottom:22px}
.card .body .link-arrow{margin-top:auto}
.card .fig-note{position:relative}
.card h3 a{color:var(--ink);text-decoration:none}
.card h3 a:hover{color:var(--accent)}
.badge{display:inline-block;align-self:flex-start;font-family:var(--mono);font-size:.7rem;font-weight:500;letter-spacing:.07em;text-transform:uppercase;color:var(--accent);margin-bottom:12px}
.badge.muted{color:var(--faint)}
.chips{display:flex;flex-wrap:wrap;gap:6px;list-style:none;padding:0;margin:0 0 16px}
.chips li{font-family:var(--mono);font-size:.74rem;color:var(--text);border:1px solid var(--line2);border-radius:3px;padding:3px 8px;background:#fff}
.post-list .card{padding:28px}
.post-list .card.product{padding:0}

/* feature list (hairline) */
.features{display:grid;grid-template-columns:repeat(2,1fr);gap:0 40px;margin-top:36px}
.features>div{padding:22px 0;border-top:1px solid var(--line)}
.features h3{font-size:1.02rem;margin-bottom:6px;display:flex;align-items:center;gap:10px}
.features h3 svg{width:20px;height:20px;color:var(--accent);flex:none}
.features p{color:var(--muted);font-size:.95rem;margin:0}
.features.g4c{grid-template-columns:repeat(4,1fr);gap:0 32px;margin-top:0}

/* application grid */
.apps{display:grid;grid-template-columns:repeat(3,1fr);border-top:1px solid var(--line2);border-left:1px solid var(--line)}
.apps>div{padding:30px 30px 32px;border-right:1px solid var(--line);border-bottom:1px solid var(--line);background:#fff}
.apps .n{font-family:var(--mono);font-size:.74rem;color:var(--faint);display:block;margin-bottom:22px}
.apps h3{margin-bottom:8px}
.apps p{color:var(--muted);font-size:.96rem;margin:0}
.apps .ask{background:var(--tint)}

/* steps */
.steps{list-style:none;counter-reset:s;padding:0;margin:0;display:grid;grid-template-columns:repeat(4,1fr);gap:0 28px}
.steps li{counter-increment:s;padding-top:22px;border-top:2px solid var(--ink);position:relative}
.steps li::before{content:"0" counter(s);display:block;font-family:var(--mono);font-size:.8rem;font-weight:500;color:var(--accent);margin-bottom:14px;letter-spacing:.04em}
.steps h3{margin-bottom:8px}
.steps p{color:var(--muted);font-size:.96rem;margin:0}

/* lists */
.ticks{list-style:none;padding:0;margin:0 0 1.2em}
.ticks li{position:relative;padding:12px 0 12px 28px;border-top:1px solid var(--line)}
.ticks li:last-child{border-bottom:1px solid var(--line)}
.ticks li::before{content:"";position:absolute;left:2px;top:21px;width:12px;height:6px;border-left:2px solid var(--accent);border-bottom:2px solid var(--accent);transform:rotate(-45deg)}

/* tables */
.table-wrap{overflow-x:auto;border:1px solid var(--line);border-radius:var(--r);margin:0 0 14px;background:#fff;-webkit-overflow-scrolling:touch}
table{width:100%;border-collapse:collapse;font-size:.95rem;font-variant-numeric:tabular-nums}
th,td{text-align:left;padding:13px 18px;border-bottom:1px solid var(--line);vertical-align:top}
thead th{background:var(--soft);color:var(--ink);font-family:var(--mono);font-size:.74rem;font-weight:500;letter-spacing:.06em;text-transform:uppercase;border-bottom:1px solid var(--line2)}
tbody tr:last-child td{border-bottom:0}
tbody td:first-child{color:var(--ink);font-weight:500;width:36%}
tbody tr:hover td{background:#fafbfc}
.spec-title{display:flex;align-items:baseline;gap:14px;flex-wrap:wrap;margin:0 0 16px;font-size:1.2rem}
.spec-title code{font-family:var(--mono);font-size:.8rem;font-weight:500;color:var(--accent);background:var(--tint);padding:3px 8px;border-radius:3px}

/* callout */
.callout{border-left:3px solid var(--accent);background:var(--tint);padding:18px 22px;border-radius:0 var(--r) var(--r) 0;margin:26px 0}
.callout p{margin:0;color:var(--text)}

/* CTA band */
.cta{background:var(--ink);color:#c4ceda;padding:80px 0}
.cta .wrap{display:flex;align-items:center;justify-content:space-between;gap:40px}
.cta h2{color:#fff;margin-bottom:10px}
.cta p{margin:0;max-width:560px;color:#aebbca;font-size:1.05rem}
.cta .eyebrow{color:var(--accent-l)}

/* form + contact */
.form{display:grid;gap:18px}
.form .row{display:grid;grid-template-columns:1fr 1fr;gap:18px}
label{display:block;font-size:.88rem;font-weight:500;color:var(--ink);margin-bottom:6px}
input,select,textarea{width:100%;font:inherit;font-size:1rem;color:var(--ink);background:#fff;border:1px solid var(--line2);border-radius:var(--r);padding:11px 13px;min-height:48px}
textarea{min-height:140px;resize:vertical}
input:focus,select:focus,textarea:focus{outline:none;border-color:var(--accent);box-shadow:0 0 0 3px rgba(13,110,121,.14)}
.contact-card{background:var(--soft);border:1px solid var(--line);border-radius:var(--r);padding:32px}
.contact-card h3{font-size:1.2rem;margin-bottom:18px}
.contact-card dl{margin:0}
.contact-card dt{font-family:var(--mono);font-size:.7rem;letter-spacing:.07em;text-transform:uppercase;color:var(--faint);padding-top:16px;border-top:1px solid var(--line);margin-top:16px}
.contact-card dt:first-child{border-top:0;margin-top:0;padding-top:0}
.contact-card dd{margin:4px 0 0;color:var(--ink);font-weight:500;word-break:break-word}
.contact-card .note{margin:26px 0 0}

/* article */
.article{max-width:740px;margin:0 auto}
.article h2{font-size:1.45rem;margin:2em 0 .6em}
.article ul{padding-left:1.2em}
.article li{margin-bottom:.45em}
.article li::marker{color:var(--accent)}
.article .table-wrap{margin:1.4em 0}
.article-fig{max-width:740px;margin:0 auto 40px}

/* footer */
.site-footer{background:var(--ink);color:#aebbca;padding:72px 0 32px;font-size:.94rem;border-top:1px solid #1c2c42}
.site-footer .brand{color:#fff}
.site-footer .brand small{color:#8292a6}
.site-footer a{color:#d5dde7;text-decoration:none}
.site-footer a:hover{color:#fff;text-decoration:underline}
.foot{display:grid;grid-template-columns:1.6fr 1fr 1fr 1.2fr;gap:40px}
.foot h4{color:#fff;font-family:var(--mono);font-size:.74rem;font-weight:500;letter-spacing:.08em;text-transform:uppercase;margin-bottom:16px}
.foot ul{list-style:none;padding:0;margin:0}
.foot li{margin-bottom:9px}
.foot p{margin-top:18px;max-width:340px;color:#aebbca}
.foot-bottom{display:flex;justify-content:space-between;gap:24px;flex-wrap:wrap;margin-top:56px;padding-top:24px;border-top:1px solid #23344b;font-size:.82rem;color:#8b9aae}
.foot-bottom a{color:#c3cdd9;text-decoration:underline}

.btn-wa{background:#fff;color:var(--ink);border-color:var(--line2)}
.btn-wa svg{width:18px;height:18px;color:#1fa855;flex:none}
.btn-wa:hover{border-color:#1fa855;color:var(--ink)}
.contact-actions{margin:24px 0 0}
.contact-actions .btn{width:100%}
.wa-float{position:fixed;right:24px;bottom:24px;z-index:40;width:56px;height:56px;border-radius:50%;background:#25d366;color:#fff;display:flex;align-items:center;justify-content:center;box-shadow:0 4px 14px rgba(12,27,46,.22);transition:transform .15s,background .15s}
.wa-float svg{width:28px;height:28px}
.wa-float:hover{background:#1fb855;color:#fff;transform:translateY(-2px)}
.wa-float:focus-visible{outline:3px solid var(--accent-l);outline-offset:3px}
@media (max-width:640px){.wa-float{right:16px;bottom:16px;width:52px;height:52px}.wa-float svg{width:26px;height:26px}.site-footer{padding-bottom:84px}}
@media print{.wa-float{display:none}}

/* reveal */
.js .reveal{opacity:0;transform:translateY(10px);transition:opacity .5s ease,transform .5s ease}
.js .reveal.in{opacity:1;transform:none}
@media (prefers-reduced-motion:reduce){.js .reveal{opacity:1;transform:none;transition:none}html{scroll-behavior:auto}}

/* responsive */
@media (max-width:1100px){.menu{gap:22px}.keydata{grid-template-columns:repeat(3,1fr)}.keydata li:nth-child(4){border-left:0}.keydata li:nth-child(n+4){border-top:1px solid var(--line)}}
@media (max-width:980px){
  :root{--sec:80px}
  .burger{display:block}
  .menu{display:none;position:absolute;left:0;right:0;top:72px;flex-direction:column;align-items:stretch;gap:0;background:#fff;border-bottom:1px solid var(--line);padding:8px var(--gut) 20px;box-shadow:0 12px 24px rgba(12,27,46,.06)}
  .menu.open{display:flex}
  .menu li{border-bottom:1px solid var(--line)}
  .menu li:last-child{border:0;padding-top:16px}
  .menu a{display:block;padding:14px 0;border:0}
  .menu a[aria-current="page"]{color:var(--accent)}
  .menu .btn{display:flex;width:100%;padding:12px 16px}
  .hero-grid,.split{grid-template-columns:1fr;gap:44px}
  .split.rev>:first-child{order:0}
  .g3,.g4,.apps,.features.g4c{grid-template-columns:repeat(2,1fr)}
  .steps{grid-template-columns:repeat(2,1fr);gap:36px 28px}
  .foot{grid-template-columns:1fr 1fr}
  .cta .wrap{flex-direction:column;align-items:flex-start}
  .hero h1{max-width:16ch}
  .page-hero .keydata{grid-template-columns:repeat(2,1fr)}
  .page-hero .keydata li:nth-child(3){border-left:0}
  .page-hero .keydata li:nth-child(n+3){border-top:1px solid var(--line)}
}
@media (max-width:640px){
  :root{--sec:60px;--gut:20px}
  body{font-size:16px}
  .nav{height:64px}
  .menu{top:64px}
  .brand svg{width:30px;height:30px}
  .hero{padding-top:36px}
  .hero .lead{font-size:1.04rem;margin-bottom:24px}
  .hero-cta .btn{flex:1 1 auto}
  .hero-grid{gap:32px}
  .hero-media img{aspect-ratio:16/10}
  .keydata,.page-hero .keydata{grid-template-columns:1fr 1fr;margin-top:36px}
  .keydata li{padding:14px 16px;border-left:0!important;border-top:1px solid var(--line)}
  .keydata li:nth-child(even){border-left:1px solid var(--line)!important}
  .keydata li:nth-child(-n+2){border-top:0}
  .keydata li:last-child:nth-child(odd){grid-column:1/-1}
  .keydata b{font-size:.92rem}
  .page-hero{padding:40px 0 40px}
  .crumbs{margin-bottom:20px}
  .lead{font-size:1.05rem}
  .g2,.g3,.g4,.apps,.features,.features.g4c,.steps,.form .row{grid-template-columns:1fr}
  .steps{gap:28px}
  .section-head{margin-bottom:36px}
  .section-head.row{display:block}
  .card,.contact-card{padding:24px}
  .card .body{padding:24px}
  .apps>div{padding:24px}
  .apps .n{margin-bottom:12px}
  .cta{padding:60px 0}
  .cta .btn{width:100%}
  .foot{grid-template-columns:1fr;gap:32px}
  th,td{padding:11px 14px}
  table{font-size:.9rem}
  .foot-bottom{flex-direction:column;gap:10px}
}
/* rhythm: collapse double padding between adjacent same-background sections */
section:not(.soft):not(.cta):not(.page-hero):not(.hero)+section:not(.soft):not(.cta){padding-top:0}
section.soft+section.soft{padding-top:0}
.article-fig .media img{aspect-ratio:16/9}
.grid+.note{margin-top:24px}
@media (max-width:640px){.cap-x{display:none}.hero-media figcaption{margin-top:8px}}