/* ==========================================================================
   North RF — Precision RF & Microwave Components
   Design system: DARK THEME — deep navy base + signal cyan accents
   Page, cards and tables share one continuous navy surface;
   product photos are cool-toned and fade into the card at the bottom.
   ========================================================================== */

/* Self-hosted Inter — the de-facto standard for Western B2B sites.
   latin subset only; Chinese pages switch to YaHei/PingFang via lang.js. */
@font-face{font-family:'Inter';font-style:normal;font-weight:400;font-display:swap;src:url('fonts/inter-latin-400.woff2') format('woff2')}
@font-face{font-family:'Inter';font-style:normal;font-weight:600;font-display:swap;src:url('fonts/inter-latin-600.woff2') format('woff2')}
@font-face{font-family:'Inter';font-style:normal;font-weight:700;font-display:swap;src:url('fonts/inter-latin-700.woff2') format('woff2')}

:root{
  --navy-900:#071a2f;
  --navy-800:#0b2545;
  --navy-700:#13315c;
  --navy-600:#1b4173;
  --cyan:#22a6d6;
  --cyan-dk:#1583ae;
  --cyan-lt:rgba(34,166,214,.14);
  --ink:#e6edf4;
  --head:#f4f8fc;
  --sub:#9db4c9;
  --muted:#7d94ab;
  --line:#1d3a5f;
  --line-dk:#2a4a73;
  --bg:#071a2f;
  --soft:#0a2038;
  --soft-2:#0e2a4a;
  --imgbg:#d2dee9;

  --shadow-sm:0 1px 3px rgba(0,0,0,.35);
  --shadow:0 4px 16px rgba(0,0,0,.4);
  --shadow-lg:0 12px 40px rgba(0,0,0,.5);

  --r-sm:4px;
  --r:8px;
  --r-lg:14px;

  --wrap:1200px;
  --font:'Inter',-apple-system,BlinkMacSystemFont,"Segoe UI","Helvetica Neue",Arial,"Noto Sans",sans-serif;
  --mono:"SFMono-Regular",Consolas,"Liberation Mono",Menlo,monospace;
}

*{box-sizing:border-box;margin:0;padding:0}
html{scroll-behavior:smooth}
/* ---- dark-theme page scrollbar (visible on dark background) ---- */
html{scrollbar-width:thin;scrollbar-color:#2f4a68 #0b1220}
html::-webkit-scrollbar{width:12px;height:12px}
html::-webkit-scrollbar-track{background:#0b1220}
html::-webkit-scrollbar-thumb{
  background:#2f4a68;border-radius:7px;border:3px solid #0b1220;
}
html::-webkit-scrollbar-thumb:hover{background:#3f6288}
html::-webkit-scrollbar-corner{background:#0b1220}
body{
  font-family:var(--font);
  color:var(--ink);
  background:var(--bg);
  line-height:1.65;
  -webkit-font-smoothing:antialiased;
  font-size:16px;
}
::selection{background:rgba(34,166,214,.4);color:#fff}
img{max-width:100%;display:block}
a{color:#bfd9ea;text-decoration:none;transition:color .18s}
a:hover{color:var(--cyan)}
ul{list-style:none}

.wrap{max-width:var(--wrap);margin:0 auto;padding:0 28px}

/* ---------- Typography ---------- */
h1,h2,h3,h4{line-height:1.2;font-weight:700;letter-spacing:-.015em;color:var(--head)}
h1{font-size:2.85rem}
h2{font-size:2.05rem}
h3{font-size:1.28rem}
h4{font-size:1.05rem}

.eyebrow{
  display:inline-block;font-size:.75rem;font-weight:700;letter-spacing:.14em;
  text-transform:uppercase;color:#4db7e2;margin-bottom:14px;
}
.lead{font-size:1.1rem;color:var(--sub);max-width:760px}
.sec-sub{color:var(--sub);max-width:720px;margin-top:14px}

/* ---------- Buttons ---------- */
.btn{
  display:inline-flex;align-items:center;gap:9px;
  padding:13px 26px;border-radius:var(--r-sm);
  font-size:.94rem;font-weight:600;letter-spacing:.01em;
  border:1.5px solid transparent;cursor:pointer;
  transition:all .2s;white-space:nowrap;
}
.btn-primary{background:var(--cyan);color:#fff}
.btn-primary:hover{background:var(--cyan-dk);color:#fff;transform:translateY(-1px);box-shadow:var(--shadow)}
.btn-ghost{background:transparent;color:#fff;border-color:rgba(255,255,255,.42)}
.btn-ghost:hover{background:rgba(255,255,255,.1);color:#fff;border-color:rgba(255,255,255,.75)}
.btn-outline{background:var(--soft-2);color:var(--ink);border-color:var(--line-dk)}
.btn-outline:hover{border-color:var(--cyan);color:#7fd4ef;background:rgba(34,166,214,.08)}

/* ==========================================================================
   HEADER
   ========================================================================== */
.site-header{
  position:sticky;top:0;z-index:100;
  background:rgba(7,26,47,.92);
  backdrop-filter:blur(10px);-webkit-backdrop-filter:blur(10px);
  border-bottom:1px solid var(--line);
}
.site-header .wrap{display:flex;align-items:center;justify-content:space-between;height:74px}
.brand{display:flex;align-items:center;gap:11px;font-weight:700;font-size:1.18rem;color:var(--head);letter-spacing:-.01em}
.brand:hover{color:var(--head)}
.brand-mark{
  width:36px;height:36px;border-radius:var(--r-sm);flex:0 0 auto;
  background:linear-gradient(135deg,var(--navy-700),var(--cyan));
  display:flex;align-items:center;justify-content:center;
  color:#fff;font-size:.82rem;font-weight:800;letter-spacing:.02em;
}
.brand-sub{display:block;font-size:.63rem;font-weight:500;color:var(--muted);letter-spacing:.14em;text-transform:uppercase;line-height:1;margin-top:3px}

.nav{display:flex;align-items:center;gap:2px}
.nav > li > a{
  display:block;padding:9px 14px;font-size:.92rem;font-weight:500;
  color:#c9dbea;border-radius:var(--r-sm);
}
.nav > li > a:hover,.nav > li > a.active{background:var(--cyan-lt);color:#7fd4ef}

.nav-toggle{display:none;background:none;border:0;font-size:1.5rem;color:#c9dbea;cursor:pointer;padding:6px}
.nav-search{
  position:relative;margin-left:auto;margin-right:10px;flex:0 1 260px;
}
.nav-search svg{
  position:absolute;left:11px;top:50%;transform:translateY(-50%);
  width:15px;height:15px;fill:none;stroke:rgba(255,255,255,.45);stroke-width:2;
  stroke-linecap:round;pointer-events:none;
}
.nav-search input{
  width:100%;background:rgba(255,255,255,.07);border:1px solid rgba(255,255,255,.16);
  color:#e8edf4;border-radius:999px;padding:8px 14px 8px 33px;
  font-size:.85rem;font-family:inherit;outline:none;transition:border-color .18s,background .18s;
}
.nav-search input::placeholder{color:rgba(255,255,255,.42)}
.nav-search input:focus{border-color:rgba(34,166,214,.7);background:rgba(255,255,255,.11)}

/* ==========================================================================
   HERO
   ========================================================================== */
.hero{
  position:relative;overflow:hidden;color:#fff;
  background:linear-gradient(140deg,var(--navy-900) 0%,var(--navy-800) 45%,var(--navy-600) 100%);
  padding:96px 0 108px;
}
.hero::before{
  content:"";position:absolute;inset:0;opacity:.5;
  background-image:
    linear-gradient(rgba(255,255,255,.05) 1px,transparent 1px),
    linear-gradient(90deg,rgba(255,255,255,.05) 1px,transparent 1px);
  background-size:56px 56px;
  mask-image:radial-gradient(ellipse at 68% 32%,#000 12%,transparent 68%);
  -webkit-mask-image:radial-gradient(ellipse at 68% 32%,#000 12%,transparent 68%);
}
.hero::after{
  content:"";position:absolute;width:620px;height:620px;border-radius:50%;
  right:-160px;top:-220px;
  background:radial-gradient(circle,rgba(34,166,214,.30),transparent 68%);
  pointer-events:none;
}
.hero .wrap{position:relative;z-index:2}
.hero-grid{display:grid;grid-template-columns:1.15fr .85fr;gap:64px;align-items:center}

.hero h1{color:#fff;font-size:3.05rem;margin-bottom:22px}
.hero h1 .accent{color:var(--cyan)}
.hero p{color:rgba(255,255,255,.82);font-size:1.1rem;max-width:600px;margin-bottom:32px}
.hero-actions{display:flex;flex-wrap:wrap;gap:14px}

.hero-panel{
  background:rgba(255,255,255,.055);
  border:1px solid rgba(255,255,255,.15);
  border-radius:var(--r-lg);
  padding:26px;backdrop-filter:blur(6px);
}
.hero-panel-title{
  font-size:.74rem;letter-spacing:.15em;text-transform:uppercase;
  color:var(--cyan);font-weight:700;margin-bottom:16px;
}
.spec-row{
  display:flex;justify-content:space-between;align-items:center;
  padding:11px 0;border-bottom:1px solid rgba(255,255,255,.11);font-size:.9rem;
}
.spec-row:last-child{border-bottom:0}
.spec-row dt{color:rgba(255,255,255,.65)}
.spec-row dd{color:#fff;font-weight:600;font-family:var(--mono);font-size:.88rem}

/* ---------- Interface chips ---------- */
.chips{display:flex;flex-wrap:wrap;gap:9px}
.chip{
  padding:6px 13px;border-radius:100px;font-size:.82rem;font-weight:600;
  background:rgba(255,255,255,.1);border:1px solid rgba(255,255,255,.2);
  color:#fff;font-family:var(--mono);letter-spacing:.02em;
}
.chip:hover{background:rgba(255,255,255,.18);color:#fff}

/* ==========================================================================
   STATS STRIP
   ========================================================================== */
.stats{background:var(--navy-900);border-top:1px solid rgba(255,255,255,.07);padding:0}
.stats-grid{display:grid;grid-template-columns:repeat(4,1fr)}
.stat{padding:26px 22px;text-align:center;border-right:1px solid rgba(255,255,255,.08)}
.stat:last-child{border-right:0}
.stat b{display:block;font-size:1.6rem;color:#fff;font-weight:700;letter-spacing:-.02em}
.stat span{font-size:.78rem;color:rgba(255,255,255,.62);letter-spacing:.06em;text-transform:uppercase}

/* ==========================================================================
   SECTIONS
   ========================================================================== */
.section{padding:88px 0}
.section.alt{background:var(--soft)}
.section-head{margin-bottom:48px;max-width:820px}
.section-head.center{text-align:center;margin-left:auto;margin-right:auto}

.grid{display:grid;gap:24px}
.g2{grid-template-columns:repeat(2,1fr)}
.g3{grid-template-columns:repeat(3,1fr)}
.g4{grid-template-columns:repeat(4,1fr)}

/* ---------- Product cards ---------- */
.pcard{
  background:var(--navy-800);border:1px solid var(--line);border-radius:var(--r);
  padding:28px 26px;transition:all .22s;position:relative;display:flex;flex-direction:column;
}
.pcard:hover{transform:translateY(-3px);box-shadow:var(--shadow-lg);border-color:var(--cyan)}
/* Image band at the top of product cards — photo fades into the card below */
.pcard-img{
  position:relative;
  height:150px;margin:-28px -26px 22px;border-radius:var(--r) var(--r) 0 0;
  overflow:hidden;background:var(--imgbg);border-bottom:1px solid var(--line);
}
.pcard-img img{
  width:100%;height:100%;object-fit:cover;display:block;transition:transform .35s;
  -webkit-mask-image:linear-gradient(180deg,#000 52%,rgba(0,0,0,.45) 82%,rgba(0,0,0,.08) 100%);
  mask-image:linear-gradient(180deg,#000 52%,rgba(0,0,0,.45) 82%,rgba(0,0,0,.08) 100%);
}
.pcard:hover .pcard-img img{transform:scale(1.05)}
/* Blueprint-style tile for categories without photography */
.pcard-img.img-dark{
  background:linear-gradient(135deg,#0e2a4a 0%,#1b4173 100%);
  display:flex;align-items:center;justify-content:center;color:#7cc4e8;
  border-bottom:1px solid #1d3a5f;
}
.pcard-img.img-dark svg{width:60px;height:60px;stroke-width:1.2;opacity:.95}
/* Light-photo tile — matches the pale blue-gray studio background of the card photos */
.pcard-img.img-light{
  background:linear-gradient(135deg,#d2dfee 0%,#dfe8f1 55%,#d6e1ec 100%);
  display:flex;align-items:center;justify-content:center;color:#0b2545;
  border-bottom:1px solid #bccbdb;
}
.pcard-img.img-light svg{width:60px;height:60px;stroke-width:1.4;opacity:.9}
.pcard-img.img-dark::after,
.pcard-img.img-light::after{
  content:"";position:absolute;inset:0;pointer-events:none;
  -webkit-mask-image:linear-gradient(180deg,#000 52%,rgba(0,0,0,.45) 82%,rgba(0,0,0,.08) 100%);
  mask-image:linear-gradient(180deg,#000 52%,rgba(0,0,0,.45) 82%,rgba(0,0,0,.08) 100%);
  background:linear-gradient(180deg,transparent 60%,var(--navy-800) 100%);
}
.pcard-icon{
  width:46px;height:46px;border-radius:var(--r-sm);background:var(--cyan-lt);
  display:flex;align-items:center;justify-content:center;margin-bottom:18px;
  color:#5fc3e8;font-size:1.2rem;
}
.pcard h3{margin-bottom:9px}
.pcard p{color:var(--sub);font-size:.92rem;margin-bottom:16px;flex:1}
.pcard-meta{font-size:.8rem;color:var(--muted);font-family:var(--mono);padding-top:14px;border-top:1px solid var(--line)}
.pcard-link{font-size:.86rem;font-weight:600;color:#5fc3e8;margin-top:12px;display:inline-flex;align-items:center;gap:6px}
.pcard:hover .pcard-link{gap:10px}

/* ---------- Feature list ---------- */
.feat{display:flex;gap:16px}
.feat-ico{
  width:40px;height:40px;flex:0 0 auto;border-radius:var(--r-sm);
  background:var(--cyan-lt);color:#5fc3e8;
  display:flex;align-items:center;justify-content:center;font-weight:800;font-size:.95rem;
}
.feat h4{margin-bottom:5px;font-size:1rem}
.feat p{color:var(--sub);font-size:.9rem}

/* ---------- Tables ---------- */
.table-wrap{overflow-x:auto;border:1px solid var(--line);border-radius:var(--r);background:var(--navy-800)}
table{width:100%;border-collapse:collapse;font-size:.89rem;min-width:600px}
thead th{
  background:var(--navy-700);color:#fff;text-align:left;
  padding:13px 16px;font-weight:600;font-size:.79rem;
  letter-spacing:.06em;text-transform:uppercase;white-space:nowrap;
}
tbody td{padding:12px 16px;border-bottom:1px solid var(--line);color:var(--ink)}
tbody tr:last-child td{border-bottom:0}
tbody tr:nth-child(even){background:var(--soft)}
tbody tr:hover{background:var(--cyan-lt)}
td.mono,th.mono{font-family:var(--mono);font-size:.84rem}

/* ---------- Callout ---------- */
.callout{
  border-left:3px solid var(--cyan);background:rgba(34,166,214,.1);
  border-radius:0 var(--r-sm) var(--r-sm) 0;padding:18px 22px;margin:26px 0;
  font-size:.93rem;color:#c6e2f2;
}
.callout strong{color:var(--head)}

/* ---------- CTA band ---------- */
.cta-band{
  background:linear-gradient(135deg,var(--navy-800),var(--navy-600));
  border:1px solid var(--line);
  color:#fff;border-radius:var(--r-lg);padding:52px 48px;
  display:flex;align-items:center;justify-content:space-between;gap:36px;flex-wrap:wrap;
}
.cta-band h2{color:#fff;font-size:1.75rem;margin-bottom:9px}
.cta-band p{color:rgba(255,255,255,.78);max-width:520px}

/* ---------- Breadcrumb ---------- */
.crumb{background:var(--soft);border-bottom:1px solid var(--line);padding:14px 0;font-size:.85rem;color:var(--sub)}
.crumb a{color:var(--sub)}
.crumb a:hover{color:var(--cyan)}
.crumb span{margin:0 8px;color:var(--muted)}

/* ---------- Page hero (inner pages) ---------- */
.page-hero{
  background:linear-gradient(135deg,var(--navy-900),var(--navy-600));
  color:#fff;padding:62px 0;
}
.page-hero h1{color:#fff;font-size:2.35rem;margin-bottom:12px}
.page-hero p{color:rgba(255,255,255,.78);max-width:720px}

/* ---------- Contact ---------- */
.contact-grid{display:grid;grid-template-columns:1fr 1.15fr;gap:52px}
.contact-info li{display:flex;gap:14px;padding:16px 0;border-bottom:1px solid var(--line)}
.contact-info li:last-child{border-bottom:0}
.ci-ico{
  width:38px;height:38px;flex:0 0 auto;border-radius:var(--r-sm);
  background:var(--cyan-lt);color:#5fc3e8;
  display:flex;align-items:center;justify-content:center;font-size:1rem;
}
.ci-label{font-size:.76rem;text-transform:uppercase;letter-spacing:.1em;color:var(--muted);font-weight:600}
.ci-val{color:var(--ink);font-weight:600;font-size:.96rem}
.ci-val a{color:#5fc3e8}

.form-field{margin-bottom:18px}
.form-field label{display:block;font-size:.86rem;font-weight:600;margin-bottom:7px;color:#d5e4f0}
.form-field input,.form-field select,.form-field textarea{
  width:100%;padding:11px 14px;border:1px solid var(--line-dk);border-radius:var(--r-sm);
  font-family:inherit;font-size:.93rem;color:var(--ink);background:var(--soft);transition:border-color .18s;
}
.form-field input::placeholder,.form-field textarea::placeholder{color:#64809a}
.form-field input:focus,.form-field select:focus,.form-field textarea:focus{
  outline:0;border-color:var(--cyan);box-shadow:0 0 0 3px rgba(34,166,214,.18);
}
.form-row{display:grid;grid-template-columns:1fr 1fr;gap:18px}
.form-note{font-size:.8rem;color:var(--muted);margin-top:14px}

/* ---------- Footer ---------- */
.site-footer{background:var(--navy-900);color:rgba(255,255,255,.7);padding:64px 0 30px;font-size:.9rem;border-top:1px solid var(--line)}
.footer-grid{display:grid;grid-template-columns:1.5fr 1fr 1fr 1.2fr;gap:44px;margin-bottom:44px}
.site-footer h4{color:#fff;font-size:.82rem;letter-spacing:.12em;text-transform:uppercase;margin-bottom:18px}
.site-footer a{color:rgba(255,255,255,.7)}
.site-footer a:hover{color:var(--cyan)}
.site-footer li{margin-bottom:10px}
.site-footer .brand{color:#fff;margin-bottom:16px}
.site-footer .brand-sub{color:rgba(255,255,255,.5)}
.footer-desc{color:rgba(255,255,255,.55);font-size:.88rem;max-width:300px}
.footer-bottom{
  border-top:1px solid rgba(255,255,255,.11);padding-top:26px;
  display:flex;justify-content:space-between;gap:20px;flex-wrap:wrap;
  font-size:.83rem;color:rgba(255,255,255,.5);
}

/* ==========================================================================
   RESPONSIVE
   ========================================================================== */
@media (max-width:1024px){
  .hero-grid{grid-template-columns:1fr;gap:44px}
  .hero h1{font-size:2.5rem}
  .g4{grid-template-columns:repeat(2,1fr)}
  .footer-grid{grid-template-columns:1fr 1fr;gap:34px}
  .contact-grid{grid-template-columns:1fr;gap:40px}
}
@media (max-width:820px){
  .nav{
    display:none;position:absolute;top:74px;left:0;right:0;background:var(--navy-800);
    flex-direction:column;align-items:stretch;gap:0;padding:10px 18px 18px;
    border-bottom:1px solid var(--line);box-shadow:var(--shadow);
  }
  .nav.open{display:flex}
  .nav > li > a{padding:12px 10px}
  .nav-toggle{display:block}
  .stats-grid{grid-template-columns:repeat(2,1fr)}
  .stat{border-bottom:1px solid rgba(255,255,255,.08)}
  .stat:nth-child(2){border-right:0}
  h1{font-size:2.05rem}
  .hero{padding:64px 0 76px}
  .hero h1{font-size:2.05rem}
  .section{padding:62px 0}
  .g3,.g2{grid-template-columns:1fr}
  .cta-band{padding:38px 26px}
  .form-row{grid-template-columns:1fr}
  /* Compact numbers so values like "DC – 110 GHz" stay on one line */
  .stat b{font-size:1.15rem;letter-spacing:-.01em}
  .stat{padding:20px 14px}
  /* Compact tables: fewer columns cut off, less horizontal scrolling */
  table{min-width:480px;font-size:.82rem}
  thead th{padding:10px 11px;font-size:.72rem}
  tbody td{padding:9px 11px}
  /* Gallery captions: solid gradient so text stays readable over the fade */
  .gallery-item figcaption{
    padding:44px 16px 13px;
    background:linear-gradient(transparent,rgba(7,26,47,.55) 30%,rgba(7,26,47,.96) 78%);
  }
}
@media (max-width:520px){
  .wrap{padding:0 20px}
  .g4{grid-template-columns:1fr}
  .footer-grid{grid-template-columns:1fr}
  .hero h1{font-size:1.78rem}
  .hero-actions .btn{width:100%;justify-content:center}
  /* Spec rows stack: label on top, value below, no cramped right-alignment */
  .spec-row{flex-direction:column;align-items:flex-start;gap:4px;padding:12px 0}
  .spec-row dd{font-size:.84rem}
}

/* ==========================================================================
   GALLERY & PRODUCT PHOTOS — photos fade into the navy page at the bottom
   ========================================================================== */
.gallery{display:grid;grid-template-columns:repeat(3,1fr);gap:18px}
.gallery-item{position:relative;border-radius:var(--r);overflow:hidden;border:1px solid var(--line);background:var(--navy-800);box-shadow:var(--shadow-sm)}
.gallery-item img{
  width:100%;height:225px;object-fit:cover;display:block;transition:transform .35s;
  -webkit-mask-image:linear-gradient(180deg,#000 55%,rgba(0,0,0,.35) 85%,rgba(0,0,0,.05) 100%);
  mask-image:linear-gradient(180deg,#000 55%,rgba(0,0,0,.35) 85%,rgba(0,0,0,.05) 100%);
}
.gallery-item:hover img{transform:scale(1.04)}
.gallery-item figcaption{
  position:absolute;left:0;right:0;bottom:0;padding:30px 16px 12px;
  background:linear-gradient(transparent,rgba(7,26,47,.92));
  color:#fff;font-size:.88rem;font-weight:600;letter-spacing:.01em;
}

.sec-photos{display:flex;gap:14px;flex-wrap:wrap;margin:-10px 0 32px}
.sec-photos img{
  height:150px;width:auto;border-radius:var(--r);border:1px solid var(--line);object-fit:cover;
  background:var(--imgbg);
  -webkit-mask-image:linear-gradient(180deg,#000 55%,rgba(0,0,0,.4) 85%,rgba(0,0,0,.06) 100%);
  mask-image:linear-gradient(180deg,#000 55%,rgba(0,0,0,.4) 85%,rgba(0,0,0,.06) 100%);
}
.sec-photos img.render{width:150px;height:150px;object-fit:cover}

@media (max-width:820px){
  .gallery{grid-template-columns:repeat(2,1fr)}
  .gallery-item img{height:180px}
  .sec-photos img{height:110px}
  .sec-photos img.render{width:110px;height:110px}
}
@media (max-width:520px){
  .gallery{grid-template-columns:1fr}
}

/* ---------- Privacy / legal pages ---------- */
.wrap.narrow{max-width:860px}
.legal-block{margin-bottom:36px}
.legal-block h2{font-size:1.28rem;margin-bottom:12px}
.legal-block p{color:var(--sub);margin-bottom:10px}
.legal-block ul{list-style:disc;padding-left:24px;margin:10px 0}
.legal-block li{color:var(--sub);margin-bottom:9px;font-size:.95rem}
.legal-block strong{color:var(--ink)}

/* ==========================================================================
   Product catalog — filters, results grid
   ========================================================================== */
.cat-toolbar{
  display:flex;gap:14px;align-items:center;flex-wrap:wrap;
  margin-bottom:22px;
}
.cat-search{
  position:relative;flex:1 1 320px;min-width:0;
}
.cat-search svg{
  position:absolute;left:14px;top:50%;transform:translateY(-50%);
  width:17px;height:17px;fill:none;stroke:var(--muted);stroke-width:1.8;
  stroke-linecap:round;pointer-events:none;
}
.cat-search input{
  width:100%;padding:13px 16px 13px 42px;border-radius:10px;
  background:var(--soft);border:1px solid var(--line);color:var(--ink);
  font:inherit;font-size:.93rem;
}
.cat-search input::placeholder{color:#5d7a97}
.cat-search input:focus{outline:none;border-color:var(--cyan);background:#0c2843}

.cat-sort{display:flex;align-items:center;gap:9px;flex:0 0 auto}
.cat-sort label{color:var(--muted);font-size:.83rem;white-space:nowrap}
.cat-sort select{
  padding:12px 34px 12px 14px;border-radius:10px;background:var(--soft);
  border:1px solid var(--line);color:var(--ink);font:inherit;font-size:.88rem;
  appearance:none;cursor:pointer;
  background-image:url("data:image/svg+xml,%3Csvg xmlns='http://www.w3.org/2000/svg' viewBox='0 0 24 24' fill='none' stroke='%239db4c9' stroke-width='2'%3E%3Cpath d='M6 9l6 6 6-6'/%3E%3C/svg%3E");
  background-repeat:no-repeat;background-position:right 11px center;background-size:14px;
}
.cat-sort select:focus{outline:none;border-color:var(--cyan)}

.cat-toggle{
  display:none;align-items:center;gap:8px;padding:12px 16px;border-radius:10px;
  background:var(--soft);border:1px solid var(--line);color:var(--ink);
  font:inherit;font-size:.88rem;font-weight:600;cursor:pointer;
}
.cat-toggle svg{width:16px;height:16px;fill:none;stroke:var(--cyan);stroke-width:1.9;stroke-linecap:round}
.cat-toggle.has{border-color:rgba(34,166,214,.6);color:#7fd4ef}
.cat-badge{
  display:none;min-width:19px;height:19px;padding:0 5px;border-radius:9px;
  background:var(--cyan);color:#04121f;font-size:.7rem;font-weight:800;
  line-height:19px;text-align:center;
}
.cat-toggle.has .cat-badge{display:inline-block}

/* ---------- layout ---------- */
.cat-layout{display:grid;grid-template-columns:262px 1fr;gap:26px;align-items:start}

.cat-filters{
  background:var(--navy-800);border:1px solid var(--line);border-radius:14px;
  padding:16px 16px 8px;position:sticky;top:88px;
  max-height:calc(100vh - 110px);overflow-y:auto;
  scrollbar-width:thin;
}
.cat-filters::-webkit-scrollbar{width:7px}
.cat-filters::-webkit-scrollbar-thumb{background:var(--line-dk);border-radius:4px}
.cat-filters-head{
  display:flex;justify-content:space-between;align-items:baseline;
  padding-bottom:12px;margin-bottom:4px;border-bottom:1px solid var(--line);
}
.cat-filters-head strong{font-size:.95rem;color:var(--head)}
.cat-filters-head-actions{display:flex;align-items:center;gap:10px}
.cat-filters-close{
  display:none;width:32px;height:32px;align-items:center;justify-content:center;
  background:none;border:1px solid var(--line);border-radius:8px;
  color:var(--sub);font-size:1rem;line-height:1;cursor:pointer;
}
.cat-filters-close:hover{color:#fff;border-color:var(--cyan)}
/* 手机抽屉底部的"查看结果"按钮 */
.cat-apply{display:none}
.cat-filters-head button{
  background:none;border:0;color:#7fd4ef;font:inherit;font-size:.8rem;
  font-weight:600;cursor:pointer;padding:2px 0;
}
.cat-filters-head button:hover{color:#fff;text-decoration:underline}

.cat-group{border-bottom:1px solid var(--line)}
.cat-group:last-child{border-bottom:0}
.cat-group-head{
  width:100%;display:flex;align-items:center;gap:8px;
  background:none;border:0;color:var(--ink);font:inherit;font-size:.86rem;
  font-weight:600;padding:13px 2px;cursor:pointer;text-align:left;
}
.cat-group-head span:first-child{flex:1}
.cat-group-head svg{
  width:15px;height:15px;fill:none;stroke:var(--muted);stroke-width:2;
  stroke-linecap:round;transition:transform .18s;
}
.cat-group.open .cat-group-head svg{transform:rotate(180deg)}
.cat-pick{
  font-style:normal;font-size:.69rem;font-weight:800;color:#04121f;
  background:var(--cyan);border-radius:8px;padding:1px 6px;line-height:1.5;
}
.cat-group-body{
  display:none;padding:2px 0 12px;
  max-height:270px;overflow-y:auto;scrollbar-width:thin;
}
.cat-group-body::-webkit-scrollbar{width:6px}
.cat-group-body::-webkit-scrollbar-thumb{background:var(--line-dk);border-radius:4px}
.cat-group.open .cat-group-body{display:block}

.cat-opt{
  display:flex;align-items:center;gap:9px;padding:6px 4px;border-radius:7px;
  cursor:pointer;font-size:.845rem;color:var(--sub);line-height:1.35;
}
.cat-opt:hover{background:rgba(34,166,214,.09);color:var(--ink)}
.cat-opt input{position:absolute;opacity:0;pointer-events:none}
.cat-box{
  flex:0 0 15px;width:15px;height:15px;border-radius:4px;
  border:1.5px solid var(--line-dk);background:var(--soft);position:relative;
  transition:background .13s,border-color .13s;
}
.cat-opt.on .cat-box{background:var(--cyan);border-color:var(--cyan)}
.cat-opt.on .cat-box::after{
  content:'';position:absolute;left:4px;top:1px;width:4px;height:8px;
  border:solid #04121f;border-width:0 2px 2px 0;transform:rotate(43deg);
}
.cat-lab{flex:1;min-width:0;word-break:break-word}
.cat-opt.on .cat-lab{color:var(--ink);font-weight:600}
.cat-n{flex:0 0 auto;color:var(--muted);font-size:.76rem;font-variant-numeric:tabular-nums}

/* ---------- results ---------- */
.cat-results{min-width:0}
.cat-status{
  display:flex;flex-wrap:wrap;align-items:center;gap:10px 14px;
  margin-bottom:16px;min-height:26px;
}
#cat-count{color:var(--sub);font-size:.88rem}
#cat-count strong{color:var(--head);font-size:1.02rem}
.cat-active{display:flex;flex-wrap:wrap;gap:7px}
.cat-chip{
  display:inline-flex;align-items:center;gap:6px;padding:4px 10px;
  border-radius:20px;background:rgba(34,166,214,.15);
  border:1px solid rgba(34,166,214,.42);color:#8fdcf5;
  font:inherit;font-size:.77rem;font-weight:600;cursor:pointer;
}
.cat-chip span{opacity:.7;font-size:.9rem;line-height:1}
.cat-chip:hover{background:rgba(34,166,214,.28);color:#fff}

.cat-grid{
  display:grid;grid-template-columns:repeat(3,minmax(0,1fr));gap:14px;
}
.cat-card{
  display:flex;flex-direction:column;
  background:var(--navy-800);border:1px solid var(--line);
  border-radius:13px;padding:15px 15px 13px;
  transition:border-color .16s,transform .16s,box-shadow .16s;
}
.cat-card:hover{
  border-color:rgba(34,166,214,.5);transform:translateY(-2px);
  box-shadow:0 10px 26px -14px rgba(0,0,0,.8);
}
.cat-pic{
  height:132px;margin:-14px -14px 12px;display:flex;align-items:center;justify-content:center;
  background:radial-gradient(ellipse at 50% 42%,rgba(34,166,214,.10),transparent 70%),#0a2038;
  border-bottom:1px solid rgba(34,166,214,.14);overflow:hidden;border-radius:11px 11px 0 0;
}
.cat-pic img{max-width:88%;max-height:116px;object-fit:contain;filter:drop-shadow(0 4px 10px rgba(0,0,0,.45))}
.cat-pic.noimg::after{
  content:'⌾';font-size:2.2rem;color:rgba(127,212,239,.22);
}
.cat-card-top{display:flex;align-items:baseline;gap:9px;margin-bottom:8px}
.cat-model{
  font-family:ui-monospace,SFMono-Regular,Menlo,Consolas,monospace;
  font-size:.9rem;font-weight:700;color:#7fd4ef;letter-spacing:-.01em;
  word-break:break-all;
}
.cat-freq{
  margin-left:auto;flex:0 0 auto;font-size:.71rem;font-weight:600;
  color:var(--sub);background:var(--soft-2);border-radius:6px;padding:2px 7px;
  white-space:nowrap;
}
.cat-desc{
  color:var(--sub);font-size:.825rem;line-height:1.45;margin-bottom:10px;
  display:-webkit-box;-webkit-line-clamp:3;-webkit-box-orient:vertical;overflow:hidden;
  cursor:pointer;
}
.cat-desc.expanded{display:block;overflow:visible;-webkit-line-clamp:unset}
.cat-tags{display:flex;flex-wrap:wrap;gap:5px;margin-bottom:10px}
.cat-tag{
  font-size:.69rem;font-weight:600;color:#9fc6dd;
  background:rgba(29,58,95,.6);border:1px solid var(--line);
  border-radius:5px;padding:2px 7px;white-space:nowrap;
}
.cat-spec{
  display:grid;grid-template-columns:auto 1fr;gap:4px 12px;
  margin:0 0 12px;padding:10px 0 0;border-top:1px solid var(--line);
  font-size:.775rem;
}
.cat-spec dt{color:var(--muted)}
.cat-spec dd{margin:0;color:var(--ink);text-align:right;font-variant-numeric:tabular-nums}
.cat-card-foot{
  display:flex;align-items:center;justify-content:space-between;gap:10px;
  margin-top:auto;padding-top:11px;border-top:1px solid var(--line);
}
.cat-rfq{
  font-size:.79rem;font-weight:700;color:#7fd4ef;text-decoration:none;
  border-bottom:1px solid transparent;transition:border-color .15s;
}
.cat-rfq:hover{border-bottom-color:#7fd4ef}
.cat-imp{font-size:.72rem;color:var(--muted);font-variant-numeric:tabular-nums}

.cat-empty{
  text-align:center;padding:56px 22px;background:var(--navy-800);
  border:1px dashed var(--line-dk);border-radius:14px;
}
.cat-empty h3{font-size:1.06rem;color:var(--head);margin-bottom:8px}
.cat-empty p{color:var(--sub);font-size:.88rem;max-width:430px;margin:0 auto 18px}

.cat-more-wrap{text-align:center;margin-top:26px}

@media (max-width:1080px){
  .cat-grid{grid-template-columns:repeat(2,minmax(0,1fr))}
}
@media (max-width:860px){
  .cat-toggle{display:inline-flex}
  .cat-layout{grid-template-columns:1fr;gap:0}
  .cat-filters{
    position:fixed;top:0;left:0;right:0;bottom:0;z-index:9997;
    margin:0;border-radius:0;border:0;max-height:none;height:100%;
    padding:20px 18px 40px;overflow-y:auto;
    transform:translateY(100%);transition:transform .22s ease;
  }
  body.cat-filters-open .cat-filters{transform:translateY(0)}
  body.cat-filters-open{overflow:hidden}
  .cat-filters-close{display:inline-flex}
  .cat-apply{
    display:flex;align-items:center;justify-content:center;gap:8px;
    position:sticky;bottom:0;margin-top:20px;width:100%;
    background:var(--cyan);color:#04121f;border:0;border-radius:12px;
    padding:14px 16px;font-size:.98rem;font-weight:700;cursor:pointer;
    font-family:inherit;letter-spacing:.02em;
    box-shadow:0 -8px 22px rgba(0,0,0,.4);
  }
  .cat-apply:hover{background:#3cb9e6}
  .cat-apply-n{background:rgba(4,18,31,.22);border-radius:999px;padding:2px 10px;font-size:.88rem}
  .cat-sort{flex:1 1 auto}
  .cat-sort select{width:100%}
  .cat-grid{grid-template-columns:repeat(2,minmax(0,1fr));gap:12px}
}
@media (max-width:560px){
  .cat-toolbar{gap:10px}
  .cat-search{flex:1 1 100%}
  .cat-sort{flex:1 1 100%}
  .cat-sort label{display:none}
  .cat-grid{grid-template-columns:1fr}
  .cat-status{font-size:.83rem}
  .cat-card{padding:14px}
  .cat-model{font-size:.86rem}
}