/* ============================================================
   Ningbo Xikou Hemei Plastic Co., Ltd. — Trust Site
   Design system: "Datasheet" — industrial, spec-driven.
   Signature: pneumatic-tube color legend (BU/C/O/B/G/Y/R)
   drawn from the company's own catalog, used as the accent
   system that marks product families.
   ============================================================ */

/* ---------- Fonts ---------- */
@import url('https://fonts.googleapis.com/css2?family=Archivo:wght@500;600;700;800&family=IBM+Plex+Mono:wght@400;500;600&family=IBM+Plex+Sans:wght@400;500;600;700&display=swap');

/* ---------- Tokens ---------- */
:root{
  --ink:#16202B;
  --ink-soft:#425063;
  --ink-faint:#8593A2;
  --blue:#103A5F;          /* CROSS brand anchor / primary */
  --blue-bright:#1E5FA5;
  --paper:#FBFBFA;
  --panel:#F1F3F5;
  --panel-2:#E9EDF0;
  --line:#D9DEE3;
  --line-soft:#E7EBEE;
  --white:#FFFFFF;

  /* functional tube-color legend */
  --t-blue:#1E5FA5;
  --t-red:#D23B32;
  --t-green:#2E8B57;
  --t-yellow:#E8A419;
  --t-orange:#E0742A;
  --t-clear:#9AA7B0;
  --t-black:#2A2E33;

  --maxw:1160px;
  --gutter:clamp(20px,5vw,64px);

  --f-display:'Archivo',system-ui,sans-serif;
  --f-body:'IBM Plex Sans',system-ui,sans-serif;
  --f-mono:'IBM Plex Mono',ui-monospace,monospace;
}

/* ---------- Reset ---------- */
*{box-sizing:border-box;margin:0;padding:0}
html{scroll-behavior:smooth;-webkit-text-size-adjust:100%}
body{
  font-family:var(--f-body);
  color:var(--ink);
  background:var(--paper);
  line-height:1.6;
  font-size:16px;
  -webkit-font-smoothing:antialiased;
}
img{max-width:100%;display:block}
a{color:inherit;text-decoration:none}
button{font-family:inherit;cursor:pointer}

/* ---------- Layout helpers ---------- */
.wrap{max-width:var(--maxw);margin-inline:auto;padding-inline:var(--gutter)}
.section{padding-block:clamp(56px,9vw,110px)}
.section--tight{padding-block:clamp(40px,6vw,72px)}

/* eyebrow: mono label, encodes section index + name (true numbering: pages/sections are a real set) */
.eyebrow{
  font-family:var(--f-mono);
  font-size:12px;
  letter-spacing:.14em;
  text-transform:uppercase;
  color:var(--blue-bright);
  display:flex;align-items:center;gap:10px;
  margin-bottom:22px;
}
.eyebrow::before{
  content:"";width:26px;height:1px;background:var(--blue-bright);display:inline-block;
}

h1,h2,h3{font-family:var(--f-display);line-height:1.08;letter-spacing:-.01em;color:var(--ink)}
h1{font-size:clamp(2.1rem,5.4vw,3.7rem);font-weight:800}
h2{font-size:clamp(1.7rem,3.6vw,2.6rem);font-weight:700}
h3{font-size:clamp(1.15rem,2vw,1.4rem);font-weight:700}
p{color:var(--ink-soft)}
.lead{font-size:clamp(1.05rem,1.7vw,1.22rem);color:var(--ink-soft);max-width:60ch}

/* ---------- Top bar ---------- */
.topbar{
  position:sticky;top:0;z-index:50;
  background:rgba(251,251,250,.9);
  backdrop-filter:saturate(1.4) blur(10px);
  border-bottom:1px solid var(--line);
}
.topbar__inner{
  max-width:var(--maxw);margin-inline:auto;padding:14px var(--gutter);
  display:flex;align-items:center;justify-content:space-between;gap:20px;
}
.brand{display:flex;align-items:center;gap:12px;min-width:0}
.brand__mark{
  font-family:var(--f-display);font-weight:800;font-size:20px;letter-spacing:.02em;
  color:var(--blue);white-space:nowrap;
  display:flex;align-items:center;gap:9px;
}
.brand__mark .spectrum{display:inline-flex;height:20px;border-radius:2px;overflow:hidden;box-shadow:0 0 0 1px var(--line)}
.brand__mark .spectrum i{width:5px;display:block}
.brand__sub{font-family:var(--f-mono);font-size:10.5px;color:var(--ink-faint);letter-spacing:.04em;white-space:nowrap}

.nav{display:flex;align-items:center;gap:4px}
.nav a{
  font-size:14px;font-weight:500;color:var(--ink-soft);
  padding:8px 13px;border-radius:6px;transition:.15s;
}
.nav a:hover{color:var(--ink);background:var(--panel)}
.nav a.active{color:var(--blue);background:var(--panel)}

.langswitch{
  font-family:var(--f-mono);font-size:12px;font-weight:500;letter-spacing:.05em;
  border:1px solid var(--line);border-radius:6px;padding:7px 11px;
  color:var(--ink-soft);background:var(--white);transition:.15s;white-space:nowrap;
}
.langswitch:hover{border-color:var(--blue);color:var(--blue)}

.navtoggle{display:none;border:1px solid var(--line);background:var(--white);border-radius:6px;padding:8px 10px;color:var(--ink)}

/* ---------- Buttons ---------- */
.btn{
  display:inline-flex;align-items:center;gap:9px;
  font-weight:600;font-size:15px;
  padding:13px 22px;border-radius:7px;border:1px solid transparent;transition:.15s;
}
.btn--primary{background:var(--blue);color:#fff}
.btn--primary:hover{background:#0c2e4c}
.btn--ghost{background:transparent;color:var(--ink);border-color:var(--line)}
.btn--ghost:hover{border-color:var(--blue);color:var(--blue)}
.btn .arw{font-family:var(--f-mono);transition:transform .15s}
.btn:hover .arw{transform:translateX(3px)}

/* ---------- Hero ---------- */
.hero{position:relative;overflow:hidden;border-bottom:1px solid var(--line)}
.hero__grid{
  display:grid;grid-template-columns:1.15fr .85fr;gap:clamp(28px,4vw,56px);align-items:center;
  padding-block:clamp(48px,7vw,88px);
}
.hero h1 span.hl{color:var(--blue)}
.hero .lead{margin-top:22px}
.hero__cta{display:flex;flex-wrap:wrap;gap:12px;margin-top:32px}

/* signature: full color-legend spectrum bar */
.legend{
  margin-top:38px;border:1px solid var(--line);border-radius:8px;overflow:hidden;background:var(--white);
}
.legend__bar{display:flex;height:12px}
.legend__bar i{flex:1}
.legend__meta{
  display:flex;flex-wrap:wrap;justify-content:space-between;gap:6px 16px;
  padding:11px 15px;font-family:var(--f-mono);font-size:11px;color:var(--ink-faint);letter-spacing:.03em;
}
.legend__meta span b{color:var(--ink-soft);font-weight:600}

.hero__panel{
  background:var(--white);border:1px solid var(--line);border-radius:12px;overflow:hidden;
  box-shadow:0 24px 60px -34px rgba(16,58,95,.4);
}
.hero__panel img{width:100%;height:340px;object-fit:cover;filter:saturate(1.02)}
.hero__panel .cap{
  font-family:var(--f-mono);font-size:11.5px;color:var(--ink-faint);
  padding:12px 16px;border-top:1px solid var(--line);letter-spacing:.03em;
  display:flex;justify-content:space-between;gap:12px;
}

/* ---------- Facts strip ---------- */
.facts{border-bottom:1px solid var(--line);background:var(--panel)}
.facts__grid{display:grid;grid-template-columns:repeat(4,1fr)}
.fact{padding:26px var(--gutter);border-right:1px solid var(--line)}
.fact:last-child{border-right:none}
.fact__k{font-family:var(--f-display);font-weight:800;font-size:clamp(1.5rem,3vw,2.1rem);color:var(--blue);line-height:1}
.fact__l{font-family:var(--f-mono);font-size:11.5px;letter-spacing:.06em;text-transform:uppercase;color:var(--ink-faint);margin-top:9px}
.fact__d{font-size:13.5px;color:var(--ink-soft);margin-top:4px}
.facts .wrap{padding-inline:0}

/* ---------- Product families grid ---------- */
.families{display:grid;grid-template-columns:repeat(3,1fr);gap:14px;margin-top:40px}
.fam{
  border:1px solid var(--line);border-radius:9px;background:var(--white);
  padding:20px 20px 18px;position:relative;transition:.16s;overflow:hidden;
}
.fam::before{content:"";position:absolute;left:0;top:0;bottom:0;width:4px;background:var(--chip,var(--blue))}
.fam:hover{border-color:var(--blue);transform:translateY(-2px);box-shadow:0 16px 34px -24px rgba(16,58,95,.5)}
.fam__code{font-family:var(--f-mono);font-size:11px;color:var(--ink-faint);letter-spacing:.05em}
.fam__name{font-family:var(--f-display);font-weight:700;font-size:1.08rem;margin:5px 0 8px;color:var(--ink)}
.fam__desc{font-size:13.5px;color:var(--ink-soft);line-height:1.5}
.fam__spec{font-family:var(--f-mono);font-size:11.5px;color:var(--blue-bright);margin-top:12px;letter-spacing:.02em}

/* ---------- Two-col content ---------- */
.split{display:grid;grid-template-columns:1fr 1fr;gap:clamp(28px,4vw,56px);align-items:center}
.split--text-left{grid-template-columns:1fr 1fr}
.media{border:1px solid var(--line);border-radius:12px;overflow:hidden;background:var(--white)}
.media img{width:100%;height:100%;max-height:440px;object-fit:cover}
.media .cap{font-family:var(--f-mono);font-size:11.5px;color:var(--ink-faint);padding:12px 16px;border-top:1px solid var(--line);letter-spacing:.03em}

/* ---------- Trust points ---------- */
.trust{display:grid;grid-template-columns:repeat(2,1fr);gap:1px;background:var(--line);border:1px solid var(--line);border-radius:12px;overflow:hidden;margin-top:40px}
.trust__item{background:var(--paper);padding:28px}
.trust__idx{font-family:var(--f-mono);font-size:12px;color:var(--blue-bright);letter-spacing:.08em}
.trust__item h3{margin:12px 0 8px}
.trust__item p{font-size:14.5px}

/* ---------- Spec table ---------- */
.spec-block{margin-top:34px;border:1px solid var(--line);border-radius:10px;overflow:hidden;background:var(--white)}
.spec-head{
  display:flex;align-items:center;gap:14px;padding:16px 20px;border-bottom:1px solid var(--line);
  background:var(--panel);flex-wrap:wrap;
}
.spec-chip{width:14px;height:14px;border-radius:3px;background:var(--chip,var(--blue));flex:none;box-shadow:0 0 0 1px rgba(0,0,0,.08)}
.spec-head h3{font-size:1.1rem}
.spec-head .code{font-family:var(--f-mono);font-size:12px;color:var(--ink-faint);margin-left:auto;letter-spacing:.04em}
.spec-note{font-size:13px;color:var(--ink-soft);padding:14px 20px 0}
.tablewrap{overflow-x:auto}
table.spec{width:100%;border-collapse:collapse;font-size:13.5px;min-width:520px}
table.spec th,table.spec td{padding:10px 14px;text-align:left;border-bottom:1px solid var(--line-soft)}
table.spec thead th{
  font-family:var(--f-mono);font-size:11px;letter-spacing:.05em;text-transform:uppercase;
  color:var(--ink-faint);background:var(--white);font-weight:600;border-bottom:1px solid var(--line);
}
table.spec tbody td:first-child{font-family:var(--f-mono);color:var(--blue);font-weight:500}
table.spec tbody tr:hover{background:var(--panel)}
table.spec td.num{font-family:var(--f-mono);color:var(--ink)}

/* color legend inline */
.colorkey{display:flex;flex-wrap:wrap;gap:8px 14px;margin-top:18px;font-family:var(--f-mono);font-size:11.5px;color:var(--ink-soft)}
.colorkey span{display:inline-flex;align-items:center;gap:6px}
.colorkey i{width:12px;height:12px;border-radius:3px;box-shadow:0 0 0 1px rgba(0,0,0,.1)}

/* ---------- Cert cards ---------- */
.certgrid{display:grid;grid-template-columns:1fr 1fr;gap:16px;margin-top:36px}
.cert{border:1px solid var(--line);border-radius:11px;background:var(--white);overflow:hidden;display:flex;flex-direction:column}
.cert__tag{
  font-family:var(--f-mono);font-size:11px;letter-spacing:.06em;text-transform:uppercase;
  padding:9px 16px;border-bottom:1px solid var(--line);
}
.cert__tag.company{background:#0f3a5f;color:#fff}
.cert__tag.material{background:var(--panel);color:var(--ink-soft)}
.cert__body{padding:20px;flex:1}
.cert__body h3{font-size:1.12rem;margin-bottom:6px}
.cert__body p{font-size:14px;margin-bottom:12px}
.cert__rows{font-family:var(--f-mono);font-size:12px;color:var(--ink-soft);border-top:1px dashed var(--line);padding-top:12px}
.cert__rows div{display:flex;justify-content:space-between;gap:14px;padding:3px 0}
.cert__rows div b{color:var(--ink);font-weight:600;text-align:right}
.callout{
  border:1px solid var(--line);border-left:3px solid var(--blue-bright);
  background:var(--panel);border-radius:8px;padding:18px 20px;margin-top:26px;font-size:14px;color:var(--ink-soft);
}
.callout b{color:var(--ink)}

/* ---------- Registration table (verification) ---------- */
.regtable{margin-top:34px;border:1px solid var(--line);border-radius:10px;overflow:hidden;background:var(--white)}
.regtable div{display:flex;gap:16px;padding:14px 20px;border-bottom:1px solid var(--line-soft);font-size:14px}
.regtable div:last-child{border-bottom:none}
.regtable dt{font-family:var(--f-mono);font-size:12px;color:var(--ink-faint);letter-spacing:.03em;width:210px;flex:none;text-transform:uppercase}
.regtable dd{color:var(--ink);font-weight:500}

/* ---------- Contact ---------- */
.contact-grid{display:grid;grid-template-columns:1fr 1fr;gap:clamp(28px,4vw,52px);margin-top:40px}
.field{margin-bottom:16px}
.field label{display:block;font-family:var(--f-mono);font-size:11.5px;letter-spacing:.05em;text-transform:uppercase;color:var(--ink-faint);margin-bottom:7px}
.field input,.field textarea,.field select{
  width:100%;font-family:var(--f-body);font-size:15px;color:var(--ink);
  border:1px solid var(--line);border-radius:7px;padding:12px 14px;background:var(--white);transition:.15s;
}
.field input:focus,.field textarea:focus,.field select:focus{outline:none;border-color:var(--blue);box-shadow:0 0 0 3px rgba(16,58,95,.1)}
.field textarea{min-height:120px;resize:vertical}
.contactcard{border:1px solid var(--line);border-radius:11px;background:var(--white);overflow:hidden}
.contactcard__row{display:flex;gap:14px;padding:18px 20px;border-bottom:1px solid var(--line-soft)}
.contactcard__row:last-child{border-bottom:none}
.contactcard__row .k{font-family:var(--f-mono);font-size:11.5px;letter-spacing:.05em;text-transform:uppercase;color:var(--ink-faint);width:96px;flex:none;padding-top:2px}
.contactcard__row .v{font-size:15px;color:var(--ink)}
.contactcard__row .v a{color:var(--blue);font-weight:500}
.formnote{font-size:12.5px;color:var(--ink-faint);margin-top:6px}

/* ---------- Footer ---------- */
.footer{background:var(--ink);color:#C9D3DE;border-top:1px solid var(--ink)}
.footer__grid{display:grid;grid-template-columns:1.4fr 1fr 1fr;gap:36px;padding-block:clamp(44px,6vw,64px)}
.footer h4{font-family:var(--f-mono);font-size:11.5px;letter-spacing:.08em;text-transform:uppercase;color:#7C8D9E;margin-bottom:16px;font-weight:500}
.footer a{color:#C9D3DE;font-size:14px;display:block;padding:4px 0;transition:.15s}
.footer a:hover{color:#fff}
.footer__brand .brand__mark{color:#fff}
.footer__brand p{color:#8493A3;font-size:13.5px;margin-top:14px;max-width:34ch}
.footer__legal{
  border-top:1px solid #24313E;padding-block:20px;
  display:flex;flex-wrap:wrap;justify-content:space-between;gap:10px;
  font-family:var(--f-mono);font-size:11.5px;color:#6B7B8C;letter-spacing:.02em;
}

/* page header (interior pages) */
.pagehead{border-bottom:1px solid var(--line);background:var(--panel)}
.pagehead__inner{padding-block:clamp(44px,6vw,76px)}
.pagehead h1{max-width:16ch}
.pagehead .lead{margin-top:20px}

/* section title block */
.stitle{max-width:64ch}
.stitle p{margin-top:14px}

/* utility */
.mono{font-family:var(--f-mono)}
.divider{height:1px;background:var(--line);border:none;margin-block:clamp(40px,6vw,72px)}

/* ---------- Product imagery ---------- */
/* horizontal strip of product photos under a page/section head */
.prodstrip{display:grid;grid-template-columns:repeat(4,1fr);gap:12px;margin-top:34px}
.prodstrip figure{margin:0;border:1px solid var(--line);border-radius:10px;overflow:hidden;background:var(--white)}
.prodstrip img{width:100%;aspect-ratio:1/1;object-fit:cover;display:block;background:#fff}
.prodstrip figcaption{font-family:var(--f-mono);font-size:11px;color:var(--ink-faint);letter-spacing:.03em;padding:9px 12px;border-top:1px solid var(--line)}

/* spec block with an image beside the head */
.spec-media{display:grid;grid-template-columns:300px 1fr;gap:0;border:1px solid var(--line);border-radius:10px;overflow:hidden;background:var(--white);margin-top:34px}
.spec-media__img{background:#fff;border-right:1px solid var(--line);display:flex;align-items:center;justify-content:center}
.spec-media__img img{width:100%;height:100%;object-fit:cover;aspect-ratio:1/1}
.spec-media__body{min-width:0}
.spec-media .spec-block{margin-top:0;border:none;border-radius:0}
.spec-media__cap{font-family:var(--f-mono);font-size:11px;color:var(--ink-faint);letter-spacing:.03em;padding:8px 12px;border-top:1px solid var(--line);background:var(--panel)}

@media(max-width:820px){
  .prodstrip{grid-template-columns:1fr 1fr}
  .spec-media{grid-template-columns:1fr}
  .spec-media__img{border-right:none;border-bottom:1px solid var(--line)}
  .spec-media__img img{aspect-ratio:16/10}
}
@media(max-width:560px){
  .prodstrip{grid-template-columns:1fr 1fr}
}

/* ---------- Responsive ---------- */
@media(max-width:900px){
  .hero__grid{grid-template-columns:1fr}
  .hero__panel{order:-1}
  .hero__panel img{height:260px}
  .split{grid-template-columns:1fr}
  .facts__grid{grid-template-columns:1fr 1fr}
  .fact:nth-child(2){border-right:none}
  .families{grid-template-columns:1fr 1fr}
  .certgrid{grid-template-columns:1fr}
  .contact-grid{grid-template-columns:1fr}
  .footer__grid{grid-template-columns:1fr 1fr}
  .nav{display:none}
  .navtoggle{display:inline-flex}
  .nav.open{
    display:flex;flex-direction:column;position:absolute;top:100%;left:0;right:0;
    background:var(--paper);border-bottom:1px solid var(--line);padding:10px var(--gutter) 16px;gap:2px;
  }
  .nav.open a{padding:11px 12px}
  .trust{grid-template-columns:1fr}
  .regtable dt{width:150px}
}
@media(max-width:560px){
  .families{grid-template-columns:1fr}
  .facts__grid{grid-template-columns:1fr;text-align:left}
  .fact{border-right:none;border-bottom:1px solid var(--line)}
  .footer__grid{grid-template-columns:1fr}
  .brand__sub{display:none}
  .regtable div{flex-direction:column;gap:4px}
  .regtable dt{width:auto}
}

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

/* ---------- Ops (production & warehousing) strip ---------- */
.ops{display:grid;grid-template-columns:repeat(3,1fr);gap:12px;margin-top:34px}
.ops figure{margin:0;border:1px solid var(--line);border-radius:10px;overflow:hidden;background:var(--white)}
.ops img{width:100%;aspect-ratio:16/10;object-fit:cover;display:block}
.ops figcaption{font-family:var(--f-mono);font-size:11px;color:var(--ink-faint);letter-spacing:.03em;padding:9px 12px;border-top:1px solid var(--line)}
@media(max-width:760px){.ops{grid-template-columns:1fr}}

/* ---------- Material certificate thumbnails ---------- */
.certthumbs{display:grid;grid-template-columns:repeat(4,1fr);gap:12px;margin-top:22px}
.certthumbs figure{margin:0;border:1px solid var(--line);border-radius:8px;overflow:hidden;background:#fff}
.certthumbs .doc{height:190px;display:flex;align-items:flex-start;justify-content:center;background:#fff;overflow:hidden}
.certthumbs .doc img{width:100%;height:100%;object-fit:cover;object-position:top center}
.certthumbs figcaption{font-family:var(--f-mono);font-size:10.5px;color:var(--ink-faint);letter-spacing:.02em;padding:8px 10px;border-top:1px solid var(--line);line-height:1.4}
@media(max-width:760px){.certthumbs{grid-template-columns:1fr 1fr}}