/* ============================================================
   Kenchuang Electronic · KCCS.COM.CN
   Dark professional theme for precision frequency control
   ============================================================ */
:root{
  --bg:#070b14;
  --bg-2:#0b1120;
  --panel:#0f172a;
  --panel-2:#131d33;
  --line:rgba(148,163,184,.16);
  --line-strong:rgba(148,163,184,.30);
  --txt:#e7edf7;
  --txt-dim:#9fb0c9;
  --txt-faint:#64748b;
  --accent:#2dd4ea;
  --accent-2:#3b82f6;
  --accent-soft:rgba(45,212,234,.12);
  --gold:#fbbf24;
  --red:#f87171;
  --mono:'JetBrains Mono','SFMono-Regular',Consolas,'Courier New',monospace;
  --sans:'Inter','PingFang SC','Microsoft YaHei','Noto Sans SC',system-ui,-apple-system,sans-serif;
  --radius:14px;
  --maxw:1180px;
}
*{margin:0;padding:0;box-sizing:border-box}
html{scroll-behavior:smooth}
body{background:var(--bg);color:var(--txt);font-family:var(--sans);font-size:16px;line-height:1.7;-webkit-font-smoothing:antialiased}
a{color:var(--accent);text-decoration:none;transition:color .2s}
a:hover{color:#7de8f7}
img{max-width:100%;display:block}
::selection{background:rgba(45,212,234,.28)}

/* ---------- layout ---------- */
.wrap{max-width:var(--maxw);margin:0 auto;padding:0 28px}
section{padding:72px 0}
.sec-alt{background:var(--bg-2);border-top:1px solid var(--line);border-bottom:1px solid var(--line)}
.sec-head{text-align:center;max-width:760px;margin:0 auto 48px}
.kicker{display:inline-flex;align-items:center;gap:8px;font-family:var(--mono);font-size:12px;letter-spacing:.22em;text-transform:uppercase;color:var(--accent);margin-bottom:14px}
.kicker::before{content:"";width:22px;height:1px;background:var(--accent)}
h1,h2,h3,h4{font-weight:700;line-height:1.3;letter-spacing:-.01em}
.sec-head h2{font-size:clamp(26px,3.4vw,38px)}
.sec-head p{color:var(--txt-dim);margin-top:14px;font-size:16.5px}

/* ---------- header ---------- */
header.site{position:sticky;top:0;z-index:100;background:rgba(7,11,20,.82);backdrop-filter:blur(14px);border-bottom:1px solid var(--line)}
.nav{display:flex;align-items:center;justify-content:space-between;height:70px}
.brand{display:flex;align-items:center;gap:12px;color:var(--txt)}
.brand .logo-mark{width:38px;height:38px;flex:0 0 38px}
.brand .logo-txt b{display:block;font-size:17px;letter-spacing:.04em;line-height:1.15}
.brand .logo-txt span{display:block;font-family:var(--mono);font-size:10px;letter-spacing:.28em;color:var(--txt-faint);text-transform:uppercase}
.menu{display:flex;align-items:center;gap:6px;list-style:none}
.menu>li>a{display:block;padding:8px 14px;color:var(--txt-dim);font-size:14.5px;border-radius:8px}
.menu>li>a:hover,.menu>li>a.on{color:var(--txt);background:rgba(148,163,184,.08)}
.lang-switch{margin-left:14px;font-family:var(--mono);font-size:12.5px;border:1px solid var(--line-strong);border-radius:8px;padding:6px 12px;color:var(--txt-dim)}
.lang-switch:hover{color:var(--accent);border-color:var(--accent)}
.burger{display:none;background:none;border:1px solid var(--line-strong);border-radius:8px;padding:8px 10px;cursor:pointer}
.burger svg{display:block}
@media(max-width:920px){
  .menu{position:fixed;inset:70px 0 auto 0;background:var(--bg-2);border-bottom:1px solid var(--line);flex-direction:column;align-items:stretch;padding:14px 24px 22px;gap:2px;display:none}
  .menu.open{display:flex}
  .menu>li>a{padding:12px 8px;font-size:16px;border-radius:8px}
  .burger{display:block}
  .lang-switch{margin-left:8px}
}

/* ---------- hero ---------- */
.hero{position:relative;overflow:hidden;padding:110px 0 100px;background:
  radial-gradient(1100px 500px at 75% -10%,rgba(59,130,246,.16),transparent 60%),
  radial-gradient(800px 420px at 12% 110%,rgba(45,212,234,.10),transparent 60%),
  var(--bg)}
.hero-grid{position:absolute;inset:0;background-image:linear-gradient(rgba(148,163,184,.05) 1px,transparent 1px),linear-gradient(90deg,rgba(148,163,184,.05) 1px,transparent 1px);background-size:44px 44px;mask-image:radial-gradient(ellipse at 50% 40%,#000 30%,transparent 75%)}
.hero-wave{position:absolute;left:0;right:0;bottom:-4px;opacity:.5;pointer-events:none}
.hero-inner{position:relative;display:grid;grid-template-columns:1.15fr .85fr;gap:56px;align-items:center}
.hero h1{font-size:clamp(30px,4.2vw,50px);margin:18px 0 20px}
.hero h1 em{font-style:normal;background:linear-gradient(92deg,var(--accent),var(--accent-2));-webkit-background-clip:text;background-clip:text;color:transparent}
.hero p.lead{color:var(--txt-dim);font-size:17.5px;max-width:560px}
.hero .tagline{font-family:var(--mono);font-size:13px;letter-spacing:.14em;color:var(--accent);text-transform:uppercase}
.hero-cta{display:flex;gap:16px;margin-top:36px;flex-wrap:wrap}
.btn{display:inline-flex;align-items:center;gap:10px;padding:13px 26px;border-radius:10px;font-size:15px;font-weight:600;letter-spacing:.02em;transition:transform .15s,box-shadow .2s,background .2s}
.btn-primary{background:linear-gradient(94deg,var(--accent),var(--accent-2));color:#04121c;box-shadow:0 8px 30px rgba(45,212,234,.25)}
.btn-primary:hover{transform:translateY(-2px);color:#04121c;box-shadow:0 12px 36px rgba(45,212,234,.35)}
.btn-ghost{border:1px solid var(--line-strong);color:var(--txt)}
.btn-ghost:hover{border-color:var(--accent);color:var(--accent)}
/* spec terminal card */
.term{background:linear-gradient(180deg,rgba(15,23,42,.92),rgba(11,17,32,.92));border:1px solid var(--line-strong);border-radius:var(--radius);overflow:hidden;box-shadow:0 24px 60px rgba(0,0,0,.45)}
.term-bar{display:flex;align-items:center;gap:8px;padding:11px 16px;border-bottom:1px solid var(--line);background:rgba(148,163,184,.05)}
.term-bar i{width:10px;height:10px;border-radius:50%;background:#334155}
.term-bar i:first-child{background:#f87171}.term-bar i:nth-child(2){background:#fbbf24}.term-bar i:nth-child(3){background:#34d399}
.term-bar span{margin-left:8px;font-family:var(--mono);font-size:11.5px;color:var(--txt-faint);letter-spacing:.08em}
.term-body{padding:20px 22px;font-family:var(--mono);font-size:13px;line-height:2}
.term-body .row{display:flex;justify-content:space-between;gap:14px;border-bottom:1px dashed rgba(148,163,184,.12);padding:3px 0}
.term-body .k{color:var(--txt-faint)}
.term-body .v{color:var(--accent);text-align:right}
.term-body .v.warn{color:var(--gold)}
.term-foot{padding:10px 22px;border-top:1px solid var(--line);font-family:var(--mono);font-size:11px;color:var(--txt-faint)}
.term-foot .ok{color:#34d399}
@media(max-width:920px){.hero-inner{grid-template-columns:1fr;gap:40px}}

/* ---------- stat strip ---------- */
.stats{display:grid;grid-template-columns:repeat(4,1fr);gap:18px}
.stat{background:var(--panel);border:1px solid var(--line);border-radius:var(--radius);padding:26px 24px;position:relative;overflow:hidden}
.stat::after{content:"";position:absolute;top:0;left:0;right:0;height:2px;background:linear-gradient(90deg,var(--accent),transparent 70%)}
.stat .num{font-family:var(--mono);font-size:clamp(22px,2.6vw,30px);color:var(--accent);font-weight:700;letter-spacing:-.01em}
.stat .lbl{color:var(--txt-dim);font-size:13.5px;margin-top:8px}
@media(max-width:920px){.stats{grid-template-columns:repeat(2,1fr)}}

/* ---------- product cards ---------- */
.grid-3{display:grid;grid-template-columns:repeat(3,1fr);gap:22px}
.grid-2{display:grid;grid-template-columns:repeat(2,1fr);gap:22px}
@media(max-width:920px){.grid-3{grid-template-columns:1fr 1fr}}
@media(max-width:640px){.grid-3,.grid-2{grid-template-columns:1fr}}
.pcard{display:flex;flex-direction:column;background:var(--panel);border:1px solid var(--line);border-radius:var(--radius);padding:26px;transition:transform .2s,border-color .2s,box-shadow .2s}
.pcard:hover{transform:translateY(-4px);border-color:rgba(45,212,234,.45);box-shadow:0 18px 44px rgba(0,0,0,.35)}
.pcard .ic{width:46px;height:46px;border-radius:11px;background:var(--accent-soft);display:flex;align-items:center;justify-content:center;margin-bottom:18px}
.pcard h3{font-size:18px;margin-bottom:6px}
.pcard .sub{font-family:var(--mono);font-size:11.5px;color:var(--txt-faint);letter-spacing:.1em;text-transform:uppercase;margin-bottom:12px}
.pcard p{color:var(--txt-dim);font-size:14.5px;flex:1}
.pcard .specs{margin:16px 0 6px;font-family:var(--mono);font-size:12.5px;color:var(--txt-dim);display:flex;flex-wrap:wrap;gap:8px}
.pcard .specs b{color:var(--accent);font-weight:600}
.chip{display:inline-block;background:rgba(148,163,184,.09);border:1px solid var(--line);border-radius:6px;padding:2px 9px}
.pcard .more{margin-top:14px;font-size:14px;font-weight:600}
.badge-new{display:inline-block;margin-left:8px;font-family:var(--mono);font-size:10px;letter-spacing:.12em;color:#04121c;background:linear-gradient(92deg,var(--gold),#f59e0b);border-radius:5px;padding:2px 7px;vertical-align:2px}

/* ---------- spec table ---------- */
.table-wrap{overflow-x:auto;border:1px solid var(--line);border-radius:var(--radius);background:var(--panel)}
table.spec{width:100%;border-collapse:collapse;font-size:13.5px;min-width:860px}
table.spec th{background:rgba(148,163,184,.07);color:var(--txt-dim);font-weight:600;text-align:left;padding:12px 14px;border-bottom:1px solid var(--line-strong);white-space:nowrap;font-size:12.5px;letter-spacing:.03em}
table.spec td{padding:11px 14px;border-bottom:1px solid var(--line);color:var(--txt-dim);vertical-align:top}
table.spec tr:last-child td{border-bottom:none}
table.spec tr:hover td{background:rgba(45,212,234,.04)}
table.spec td.model{font-family:var(--mono);color:var(--accent);font-weight:600;white-space:nowrap}
table.spec td .dim{font-family:var(--mono);white-space:nowrap}
.series-block{margin-bottom:46px}
.series-block>h3{display:flex;align-items:center;gap:12px;font-size:20px;margin-bottom:6px}
.series-block>h3::before{content:"";width:4px;height:20px;border-radius:2px;background:linear-gradient(180deg,var(--accent),var(--accent-2))}
.series-block>.series-desc{color:var(--txt-dim);font-size:14.5px;margin-bottom:18px;max-width:760px}

/* ---------- applications ---------- */
.apps{display:grid;grid-template-columns:repeat(5,1fr);gap:16px}
@media(max-width:920px){.apps{grid-template-columns:repeat(2,1fr)}}
@media(max-width:560px){.apps{grid-template-columns:1fr}}
.app{background:var(--panel);border:1px solid var(--line);border-radius:var(--radius);padding:22px 18px;text-align:center;transition:border-color .2s,transform .2s}
.app:hover{border-color:rgba(45,212,234,.45);transform:translateY(-3px)}
.app .ic{width:44px;height:44px;margin:0 auto 12px;color:var(--accent)}
.app h4{font-size:15px;margin-bottom:6px}
.app p{font-size:12.8px;color:var(--txt-faint);line-height:1.6}

/* ---------- about / content ---------- */
.prose{max-width:820px;margin:0 auto}
.prose h3{font-size:21px;margin:34px 0 12px;color:var(--txt)}
.prose h3:first-child{margin-top:0}
.prose p{color:var(--txt-dim);margin-bottom:14px}
.prose ul{list-style:none;margin:0 0 16px}
.prose ul li{color:var(--txt-dim);padding:6px 0 6px 24px;position:relative}
.prose ul li::before{content:"▸";position:absolute;left:4px;color:var(--accent)}
.kv{display:grid;grid-template-columns:200px 1fr;gap:0;border:1px solid var(--line);border-radius:var(--radius);overflow:hidden;background:var(--panel)}
.kv>div{padding:15px 20px;border-bottom:1px solid var(--line);font-size:14.5px}
.kv>div:nth-last-child(-n+2){border-bottom:none}
.kv .k{color:var(--txt-faint);background:rgba(148,163,184,.05)}
.kv .v{color:var(--txt)}
.kv .v .mono{font-family:var(--mono);color:var(--accent)}
@media(max-width:640px){.kv{grid-template-columns:1fr}.kv .k{background:none;padding-bottom:0}.kv>div:nth-last-child(-n+2){border-bottom:1px solid var(--line)}.kv>div:last-child{border-bottom:none}}

/* ---------- news ---------- */
.news-item{display:flex;gap:22px;padding:22px 4px;border-bottom:1px solid var(--line);align-items:baseline}
.news-item:first-child{border-top:1px solid var(--line)}
.news-item time{font-family:var(--mono);font-size:12.5px;color:var(--txt-faint);white-space:nowrap}
.news-item .t{font-size:15.5px;color:var(--txt)}
.news-item .t:hover{color:var(--accent)}
.news-item .cat{font-family:var(--mono);font-size:10.5px;letter-spacing:.1em;color:var(--accent);background:var(--accent-soft);border-radius:5px;padding:2px 8px;white-space:nowrap}

/* ---------- CTA ---------- */
.cta-band{background:linear-gradient(94deg,rgba(45,212,234,.10),rgba(59,130,246,.10));border-top:1px solid var(--line);border-bottom:1px solid var(--line);text-align:center}
.cta-band h2{font-size:clamp(24px,3vw,34px)}
.cta-band p{color:var(--txt-dim);margin:14px auto 30px;max-width:640px}

/* ---------- placeholder note ---------- */
.tbd{border:1px dashed rgba(251,191,36,.5);background:rgba(251,191,36,.06);border-radius:var(--radius);padding:18px 22px;font-size:14px;color:var(--gold);display:flex;gap:12px;align-items:flex-start;margin:22px 0}
.tbd svg{flex:0 0 18px;margin-top:3px}

/* ---------- page hero (inner pages) ---------- */
.page-hero{padding:78px 0 58px;background:radial-gradient(900px 380px at 70% -20%,rgba(59,130,246,.14),transparent 60%),var(--bg-2);border-bottom:1px solid var(--line)}
.page-hero h1{font-size:clamp(28px,3.6vw,42px);margin:14px 0 14px}
.page-hero p{color:var(--txt-dim);max-width:720px;font-size:16.5px}
.crumb{font-family:var(--mono);font-size:12px;color:var(--txt-faint);letter-spacing:.05em}
.crumb a{color:var(--txt-faint)}
.crumb a:hover{color:var(--accent)}

/* ---------- footer ---------- */
footer.site{background:var(--bg-2);border-top:1px solid var(--line);padding:56px 0 30px;margin-top:0}
.foot-grid{display:grid;grid-template-columns:1.4fr 1fr 1fr;gap:40px;margin-bottom:40px}
@media(max-width:820px){.foot-grid{grid-template-columns:1fr}}
.foot-grid h4{font-size:14px;letter-spacing:.1em;text-transform:uppercase;color:var(--txt-dim);margin-bottom:16px}
.foot-grid ul{list-style:none}
.foot-grid ul li{padding:5px 0}
.foot-grid ul a{color:var(--txt-faint);font-size:14px}
.foot-grid ul a:hover{color:var(--accent)}
.foot-grid p{color:var(--txt-faint);font-size:14px}
.foot-bottom{border-top:1px solid var(--line);padding-top:22px;display:flex;justify-content:space-between;gap:14px;flex-wrap:wrap;font-size:12.5px;color:var(--txt-faint)}
.foot-bottom a{color:var(--txt-faint)}
.foot-bottom a:hover{color:var(--accent)}

/* ---------- reveal animation ---------- */
.rv{opacity:0;transform:translateY(18px);transition:opacity .6s ease,transform .6s ease}
.rv.in{opacity:1;transform:none}
@media(prefers-reduced-motion:reduce){.rv{opacity:1;transform:none;transition:none}}

/* ---------- hero banner image ---------- */
.hero-banner{position:relative;border-radius:var(--radius);overflow:hidden;border:1px solid var(--line);margin-top:10px}
.hero-banner img,.hero-banner video{width:100%;height:auto;display:block}
.hero-banner::after{content:"";position:absolute;inset:0;background:linear-gradient(180deg,transparent 55%,rgba(7,11,20,.55));pointer-events:none}
/* fixed-ratio banner variant for product series pages */
.hero-banner.tb{aspect-ratio:21/9}
.hero-banner.tb img,.hero-banner.tb video{width:100%;height:100%;object-fit:cover}
.hero-banner.tb img.fit{object-fit:contain;background:#fff}
.hero-banner.tb video.fit{object-fit:contain;background:#fff}
/* homepage hero video (measured phase-noise screen): always show the full frame */
.hero-banner.vid{max-width:980px;margin-left:auto;margin-right:auto}
.hero-banner.vid::after{display:none}
.hero-banner.vid video{width:100%;height:auto;aspect-ratio:16/9;max-height:72vh;object-fit:contain;display:block}

/* ---------- product image cards (Rakon style) ---------- */
.img-card{display:flex;flex-direction:column;background:var(--panel);border:1px solid var(--line);border-radius:var(--radius);overflow:hidden;transition:transform .2s,border-color .2s,box-shadow .2s}
.img-card:hover{transform:translateY(-4px);border-color:rgba(45,212,234,.45);box-shadow:0 18px 44px rgba(0,0,0,.35)}
.img-card .im{position:relative;aspect-ratio:16/10;background:var(--bg-2);overflow:hidden;display:flex;align-items:center;justify-content:center}
.img-card .im img{width:100%;height:100%;object-fit:cover}
.img-card .body{padding:20px 22px 24px;flex:1;display:flex;flex-direction:column}
.img-card h3{font-size:17.5px;margin-bottom:4px}
.img-card .sub{font-family:var(--mono);font-size:11px;color:var(--txt-faint);letter-spacing:.14em;text-transform:uppercase;margin-bottom:10px}
.img-card p{color:var(--txt-dim);font-size:14px;flex:1}
.img-card .specs{margin-top:14px;font-family:var(--mono);font-size:12px;color:var(--txt-dim);display:flex;flex-wrap:wrap;gap:7px}
.img-card .specs b{color:var(--accent);font-weight:600}
.img-card .more{margin-top:14px;font-size:13.5px;font-weight:600}

/* ---------- image placeholder ---------- */
.ph{width:100%;height:100%;display:flex;flex-direction:column;align-items:center;justify-content:center;gap:10px;background:
  repeating-linear-gradient(45deg,rgba(148,163,184,.05) 0 14px,transparent 14px 28px),var(--bg-2);
  border-bottom:1px solid var(--line)}
.ph svg{opacity:.5}
.ph .ph-txt{font-family:var(--mono);font-size:11px;letter-spacing:.16em;color:var(--txt-faint);text-transform:uppercase}

/* ---------- value props ---------- */
.vprops{display:grid;grid-template-columns:repeat(3,1fr);gap:22px}
@media(max-width:920px){.vprops{grid-template-columns:1fr}}
.vprop{background:var(--panel);border:1px solid var(--line);border-radius:var(--radius);padding:30px 28px;position:relative;overflow:hidden}
.vprop::before{content:"";position:absolute;top:0;left:0;width:44px;height:3px;background:linear-gradient(90deg,var(--accent),transparent)}
.vprop .num{font-family:var(--mono);font-size:12px;color:var(--accent);letter-spacing:.2em;margin-bottom:16px}
.vprop h3{font-size:19px;margin-bottom:10px}
.vprop p{color:var(--txt-dim);font-size:14.5px}

/* ---------- news cards ---------- */
.news-cards{display:grid;grid-template-columns:repeat(3,1fr);gap:22px}
@media(max-width:920px){.news-cards{grid-template-columns:1fr}}
.ncard{display:flex;flex-direction:column;background:var(--panel);border:1px solid var(--line);border-radius:var(--radius);overflow:hidden;transition:border-color .2s,transform .2s}
.ncard:hover{border-color:rgba(45,212,234,.4);transform:translateY(-3px)}
.ncard .im{aspect-ratio:16/9;background:var(--bg-2);border-bottom:1px solid var(--line);display:flex;align-items:center;justify-content:center}
.ncard .im img{width:100%;height:100%;object-fit:cover;display:block}
/* white-background product shots: contain + white backdrop */
.img-card .im img.fit,.ncard .im img.fit{object-fit:contain;background:#fff}
.ncard .body{padding:18px 20px 22px;flex:1;display:flex;flex-direction:column}
.ncard time{font-family:var(--mono);font-size:11.5px;color:var(--txt-faint);margin-bottom:8px}
.ncard h4{font-size:15px;line-height:1.5;margin-bottom:10px}
.ncard p{font-size:13px;color:var(--txt-faint);flex:1}
.ncard .rm{margin-top:12px;font-size:13px;font-weight:600}

/* ---------- glance stats (number + label inline) ---------- */
.glance{display:grid;grid-template-columns:repeat(4,1fr);gap:0;border:1px solid var(--line);border-radius:var(--radius);overflow:hidden;background:var(--panel)}
@media(max-width:920px){.glance{grid-template-columns:repeat(2,1fr)}}
@media(max-width:560px){.glance{grid-template-columns:1fr}}
.glance>div{padding:30px 26px;border-right:1px solid var(--line);border-bottom:1px solid var(--line)}
.glance .num{font-family:var(--mono);font-size:clamp(26px,3vw,36px);color:var(--accent);font-weight:700}
.glance .lbl{color:var(--txt-dim);font-size:13.5px;margin-top:6px}


/* ---------- RFQ form (English site) ---------- */
.rfq{background:var(--panel);border:1px solid var(--line);border-radius:var(--radius);padding:34px 36px}
.rfq h2{margin-bottom:6px}
.rfq .note{color:var(--txt-faint);font-size:13px;margin-bottom:22px}
.rfq-form{display:grid;grid-template-columns:1fr 1fr;gap:16px}
.rfq-form .full{grid-column:1/-1}
.rfq-form label{display:block;font-family:var(--mono);font-size:11px;letter-spacing:.12em;color:var(--txt-faint);text-transform:uppercase;margin-bottom:6px}
.rfq-form input,.rfq-form select,.rfq-form textarea{width:100%;box-sizing:border-box;background:var(--bg-2);border:1px solid var(--line-strong);border-radius:8px;color:var(--txt);font:inherit;font-size:14px;padding:11px 13px}
.rfq-form textarea{min-height:110px;resize:vertical}
.rfq-form input:focus,.rfq-form select:focus,.rfq-form textarea:focus{outline:none;border-color:var(--accent)}
.rfq-form .req::after{content:" *";color:#f87171}
.rfq-actions{margin-top:22px;display:flex;align-items:center;gap:18px;flex-wrap:wrap}
.rfq-actions .hint{font-size:12.5px;color:var(--txt-faint)}
@media(max-width:720px){.rfq-form{grid-template-columns:1fr}.rfq{padding:24px 20px}}