/* kexinMaterials — Industrial B2B design system */
:root{
  --navy:#0d1b2a;--navy2:#152736;--steel:#1f3a52;--orange:#f77f00;--orange-d:#d96c00;
  --bg:#f5f7fa;--card:#ffffff;--ink:#1a2733;--ink2:#4a5a68;--line:#dde4ea;
  --ok:#2e7d32;--radius:10px;--maxw:1200px;
  --font:-apple-system,"Segoe UI","PingFang SC","Microsoft YaHei","Helvetica Neue",Arial,sans-serif;
}
*{margin:0;padding:0;box-sizing:border-box}
html{scroll-behavior:smooth}
body{font-family:var(--font);color:var(--ink);background:var(--bg);line-height:1.75;font-size:16px}
img{max-width:100%;display:block}
a{color:var(--steel);text-decoration:none}
a:hover{color:var(--orange)}
.wrap{max-width:var(--maxw);margin:0 auto;padding:0 20px}

/* top bar */
.topbar{background:var(--navy);color:#c8d4de;font-size:13px}
.topbar .wrap{display:flex;justify-content:space-between;align-items:center;height:34px}
.topbar a{color:#f0a860}
/* header — Option A: dark industrial sticky bar */
.hd{background:var(--navy);border-bottom:2px solid var(--orange);position:sticky;top:0;z-index:60;box-shadow:0 2px 10px rgba(13,27,42,.18)}
.hd .wrap{display:flex;align-items:center;justify-content:space-between;height:64px;position:relative}
.logo{display:flex;align-items:baseline;gap:8px;font-weight:800;font-size:22px;color:#fff;flex:0 0 auto}
.logo b{color:var(--orange)}
.logo small{font-size:12px;color:#9fb2c1;font-weight:400}
nav.main{display:flex;gap:2px;align-items:center;flex-wrap:nowrap}
nav.main a{padding:8px 11px;border-radius:6px;font-size:14.5px;color:#dbe6f0;white-space:nowrap;transition:background .15s,color .15s}
nav.main a:hover,nav.main a.on{background:rgba(255,255,255,.12);color:#fff}
.lang-sw{background:var(--orange);border-radius:6px;padding:6px 12px;font-size:13px;margin-left:10px;color:#fff;font-weight:600;flex:0 0 auto}
.lang-sw:hover{background:var(--orange-d);color:#fff}
.menu-btn{display:none;background:none;border:1px solid rgba(255,255,255,.3);border-radius:6px;padding:6px 12px;font-size:20px;color:#fff;cursor:pointer;flex:0 0 auto}

/* hero */
.hero{background:linear-gradient(120deg,var(--navy) 0%,var(--steel) 100%);color:#fff;position:relative;overflow:hidden}
.hero .wrap{display:grid;grid-template-columns:1.15fr .85fr;gap:40px;align-items:center;padding:64px 20px}
.hero h1{font-size:34px;line-height:1.35;margin-bottom:16px}
.hero h1 em{color:var(--orange);font-style:normal}
.hero p{color:#c8d4de;margin-bottom:12px}
.hero .tags{display:flex;flex-wrap:wrap;gap:8px;margin:18px 0 26px}
.hero .tags span{border:1px solid rgba(255,255,255,.25);border-radius:20px;padding:4px 14px;font-size:13px;color:#e8eef4}
.hero img{border-radius:var(--radius);box-shadow:0 20px 50px rgba(0,0,0,.35)}
.btn{display:inline-block;background:var(--orange);color:#fff;font-weight:700;padding:13px 30px;border-radius:8px;font-size:16px}
.btn:hover{background:var(--orange-d);color:#fff}
.btn.ghost{background:transparent;border:1.5px solid rgba(255,255,255,.5);margin-left:12px}
.btn.ghost:hover{border-color:var(--orange);color:var(--orange)}

/* sections */
section{padding:56px 0}
.sec-t{text-align:center;margin-bottom:36px}
.sec-t h2{font-size:28px;color:var(--navy)}
.sec-t p{color:var(--ink2);margin-top:8px}
.grid3{display:grid;grid-template-columns:repeat(3,1fr);gap:22px}
.grid4{display:grid;grid-template-columns:repeat(4,1fr);gap:18px}
.grid2{display:grid;grid-template-columns:1fr 1fr;gap:26px}
.card{background:var(--card);border:1px solid var(--line);border-radius:var(--radius);overflow:hidden;transition:.2s}
.card:hover{transform:translateY(-3px);box-shadow:0 12px 30px rgba(13,27,42,.12)}
.card .pad{padding:20px}
.card h3{font-size:18px;color:var(--navy);margin-bottom:8px}
.card h3 a{color:inherit}
.card p{font-size:14px;color:var(--ink2)}
.card .more{display:inline-block;margin-top:10px;color:var(--orange);font-weight:600;font-size:14px}
.card img{aspect-ratio:4/3;object-fit:cover;width:100%}

/* breadcrumb */
.crumb{font-size:13px;color:var(--ink2);padding:14px 0}
.crumb a{color:var(--ink2)}
.crumb a:hover{color:var(--orange)}

/* article / keyword page */
.kw-hero{background:linear-gradient(120deg,var(--navy),var(--steel));color:#fff;padding:44px 0}
.kw-hero h1{font-size:30px;line-height:1.4}
.kw-hero .sub{color:#c8d4de;margin-top:10px;font-size:15px}
.intent-badge{display:inline-block;margin-top:12px;background:rgba(255,255,255,.16);border:1px solid rgba(255,255,255,.35);color:#fff;border-radius:20px;padding:4px 14px;font-size:13px;letter-spacing:.5px}
.layout{display:grid;grid-template-columns:1fr 320px;gap:30px;padding:40px 0}
.main-col article{background:#fff;border:1px solid var(--line);border-radius:var(--radius);padding:30px 34px;margin-bottom:24px}
.main-col h2{font-size:22px;color:var(--navy);margin:26px 0 12px;padding-left:12px;border-left:4px solid var(--orange)}
.main-col h2:first-child{margin-top:0}
.kw-fig{margin:18px 0;border:1px solid var(--line);border-radius:10px;overflow:hidden;background:var(--bg)}
.kw-fig img{display:block;width:100%;height:auto;max-height:380px;object-fit:cover}
.kw-fig figcaption{padding:9px 14px;font-size:13px;color:var(--ink2);background:#fff;border-top:1px solid var(--line)}
.main-col p{margin-bottom:12px}
.main-col ul{margin:0 0 14px 22px}
.main-col li{margin-bottom:6px}
table.spec{width:100%;border-collapse:collapse;margin:14px 0;font-size:14.5px}
table.spec th,table.spec td{border:1px solid var(--line);padding:9px 12px;text-align:left}
table.spec th{background:var(--bg);color:var(--navy);width:32%}
.qa{border:1px solid var(--line);border-radius:8px;margin-bottom:12px;background:#fff}
.qa h3{font-size:16px;padding:12px 16px;background:var(--bg);color:var(--navy)}
.qa div{padding:12px 16px;font-size:14.5px;color:var(--ink2)}
.fact{background:#fff8f0;border:1px solid #f5d5ad;border-left:4px solid var(--orange);border-radius:8px;padding:16px 20px;margin:18px 0;font-size:15px}
.fact b{color:var(--orange-d)}
.answer{background:#f0f6ff;border:1px solid #c4dcf5;border-left:4px solid #2b6cb0;border-radius:8px;padding:16px 20px;margin:0 0 20px;font-size:15.5px;line-height:1.75;color:#1a365d}
.answer p{margin:0}
.keyfacts{background:#eefaf3;border:1px solid #bfe6cd;border-left:4px solid #2f9e54;border-radius:8px;padding:14px 18px;margin:0 0 20px;font-size:14.5px;line-height:1.75;color:#14492b}
.keyfacts .kf-label{display:inline-block;font-weight:700;color:#1b7a3d;margin-right:6px}
.keyfacts p{margin:6px 0 0}
.kw-gallery{display:grid;grid-template-columns:repeat(3,1fr);gap:10px;margin:18px 0}
.kw-gallery figure{margin:0;border:1px solid var(--line);border-radius:8px;overflow:hidden;background:var(--bg)}
.kw-gallery img{display:block;width:100%;height:180px;object-fit:cover}
@media(max-width:680px){.kw-gallery{grid-template-columns:repeat(2,1fr)}.kw-gallery img{height:140px}}
/* glossary — definitional term list (GEO / AI-citation asset) */
dl.glossary{margin:14px 0 6px;padding:0}
dl.glossary dt{font-weight:700;color:var(--navy);font-size:15.5px;margin-top:14px;padding-left:12px;border-left:3px solid var(--orange)}
dl.glossary dt:first-child{margin-top:0}
dl.glossary dd{margin:6px 0 0 15px;font-size:14.5px;color:var(--ink2);line-height:1.75}
dl.glossary-full dt{scroll-margin-top:80px}
.more-link{margin-top:14px;font-size:14px}
.more-link a{color:var(--orange);font-weight:600;text-decoration:none}
.more-link a:hover{text-decoration:underline}
/* buying guide steps */
.guide-steps{margin:16px 0}
.guide-step{border:1px solid var(--line);border-radius:8px;background:#fff;padding:14px 18px;margin-bottom:12px}
.guide-step h3{font-size:16px;color:var(--navy);margin-bottom:6px;display:flex;align-items:center;gap:10px}
.guide-step p{font-size:14.5px;color:var(--ink2);margin:0;line-height:1.8}
.gs-num{display:inline-flex;align-items:center;justify-content:center;width:26px;height:26px;flex:0 0 26px;border-radius:50%;background:var(--navy);color:#fff;font-size:14px;font-weight:700}
/* engineering detail close-ups (category pages) */
.detail-shots{display:grid;grid-template-columns:repeat(3,1fr);gap:18px;margin-top:6px}
.detail-shots figure{margin:0;border:1px solid var(--line);border-radius:10px;overflow:hidden;background:#fff}
.detail-shots img{display:block;width:100%;height:230px;object-fit:cover}
.detail-shots figcaption{padding:14px 16px;font-size:14px;color:var(--ink2);line-height:1.7}
.detail-shots figcaption b{display:block;color:var(--navy);font-size:15.5px;margin-bottom:5px}
@media(max-width:900px){.detail-shots{grid-template-columns:1fr}.detail-shots img{height:200px}}
.std{border:1px solid var(--line);border-radius:8px;margin-bottom:12px;background:#fff;padding:14px 18px}
.std h3{font-size:15.5px;color:var(--navy);margin-bottom:6px}
.std p{font-size:14.5px;color:var(--ink2);margin:0}
/* comparison table (product comparison module) */
table.cmp{width:100%;border-collapse:collapse;margin:14px 0;font-size:14px}
table.cmp th,table.cmp td{border:1px solid var(--line);padding:9px 12px;text-align:left;vertical-align:top}
table.cmp thead th{background:var(--navy);color:#fff}
table.cmp tbody th{background:var(--bg);color:var(--navy);width:26%}
table.cmp td.good{background:#f3fbf4;color:var(--ink);font-weight:600}
/* case studies (E-E-A-T) */
.cases{display:grid;grid-template-columns:1fr 1fr;gap:14px;margin:16px 0}
.case{border:1px solid var(--line);border-left:4px solid var(--orange);border-radius:8px;background:#fff;padding:14px 16px}
.case-ind{display:inline-block;font-size:13px;font-weight:700;color:#fff;background:var(--navy);padding:3px 10px;border-radius:20px;margin-bottom:8px}
.case p{font-size:14px;color:var(--ink2);margin:0;line-height:1.7}
@media(max-width:560px){.cases{grid-template-columns:1fr}table.cmp{font-size:12.5px}table.cmp th,table.cmp td{padding:7px 8px}}

/* sidebar */
.side .box{background:#fff;border:1px solid var(--line);border-radius:var(--radius);padding:20px;margin-bottom:20px}
.side h3{font-size:16px;color:var(--navy);margin-bottom:12px;padding-bottom:8px;border-bottom:2px solid var(--orange)}
.side ul{list-style:none}
.side li{border-bottom:1px dashed var(--line)}
.side li a{display:block;padding:8px 2px;font-size:14px;color:var(--ink2)}
.side li a:hover{color:var(--orange)}
.cta-box{background:linear-gradient(135deg,var(--navy),var(--steel));color:#fff;text-align:center}
.side .cta-box h3{color:#fff;border-color:var(--orange)}
.cta-box p{font-size:13.5px;color:#c8d4de;margin-bottom:14px}

/* chips */
.chips{display:flex;flex-wrap:wrap;gap:8px;margin:10px 0}
.chips a{border:1px solid var(--line);background:#fff;border-radius:18px;padding:5px 14px;font-size:13px;color:var(--ink2)}
.chips a:hover{border-color:var(--orange);color:var(--orange)}

/* steps */
.steps{display:grid;grid-template-columns:repeat(4,1fr);gap:18px;counter-reset:st}
.steps .st{background:#fff;border:1px solid var(--line);border-radius:var(--radius);padding:22px;position:relative}
.steps .st::before{counter-increment:st;content:counter(st,decimal-leading-zero);font-size:30px;font-weight:800;color:var(--orange);opacity:.85;display:block;margin-bottom:8px}
.steps h3{font-size:16px;color:var(--navy);margin-bottom:6px}
.steps p{font-size:13.5px;color:var(--ink2)}

/* banner cta */
.cta-band{background:linear-gradient(120deg,var(--orange),#e8590c);color:#fff;text-align:center;padding:46px 0}
.cta-band h2{font-size:26px;margin-bottom:10px}
.cta-band p{margin-bottom:20px;color:#ffe8d2}
.cta-band .btn{background:#fff;color:var(--orange-d)}

/* footer */
footer{background:var(--navy);color:#9fb2c1;font-size:14px;margin-top:40px}
/* use padding-top/bottom only so .wrap's horizontal padding (0 20px) is preserved.
   Previously `padding:46px 0 30px` wiped out .wrap's left/right padding, making
   footer content sit flush against the screen edge on mobile. */
.ft{display:grid;grid-template-columns:1.4fr 1fr 1fr 1.2fr;gap:30px;padding-top:46px;padding-bottom:30px}
.ft h4{color:#fff;font-size:15px;margin-bottom:14px}
.ft ul{list-style:none}
.ft li{margin-bottom:8px}
.ft a{color:#9fb2c1}
.ft a:hover{color:var(--orange)}
.ft .brand{font-size:20px;font-weight:800;color:#fff}
.ft .brand b{color:var(--orange)}
.copy{border-top:1px solid rgba(255,255,255,.1);padding:16px 0;text-align:center;font-size:12.5px;color:#6f8496}

@media(max-width:960px){
  .hero .wrap{grid-template-columns:1fr;padding:44px 20px}
  .grid3,.grid4,.steps{grid-template-columns:repeat(2,1fr)}
  .layout{grid-template-columns:1fr}
  .ft{grid-template-columns:1fr 1fr}
}
/* ===== Option A mobile: full-screen dark drawer ===== */
@media(max-width:768px){
  .hd .wrap{height:56px}
  .menu-btn{display:block}
  /* drawer slides from the right as a full-height dark panel */
  nav.main{
    display:flex;flex-direction:column;align-items:stretch;gap:2px;
    position:fixed;top:0;right:0;bottom:0;width:78%;max-width:340px;
    background:var(--navy);padding:72px 16px 90px;overflow-y:auto;
    transform:translateX(100%);transition:transform .25s ease;z-index:70;
    box-shadow:-12px 0 40px rgba(0,0,0,.4)
  }
  nav.main.open{transform:translateX(0)}
  nav.main a{color:#dbe6f0;font-size:16px;padding:13px 14px;border-radius:8px}
  nav.main a:hover,nav.main a.on{background:rgba(255,255,255,.12);color:#fff}
  nav.main .lang-sw{background:var(--orange);margin:10px 0 0;padding:12px;text-align:center;font-size:15px}
  /* dim overlay */
  .nav-overlay{display:none;position:fixed;inset:0;background:rgba(0,0,0,.45);z-index:65}
  .nav-overlay.show{display:block}
  /* sticky CTA inside drawer — only shows when drawer is open.
     Sibling selector .nav-overlay.show ~ .drawer-cta beats the global
     .drawer-cta{display:none} below because of higher specificity (0,3,0) vs (0,1,0).
     This keeps the desktop rule untouched while making the mobile CTA visible
     only when the drawer is open. */
  .nav-overlay.show ~ .drawer-cta{display:block;position:fixed;bottom:0;right:0;width:78%;max-width:340px;
    background:var(--orange);color:#fff;text-align:center;font-weight:700;font-size:16px;
    padding:16px;z-index:71}
  .nav-overlay.show ~ .drawer-cta:hover{background:var(--orange-d);color:#fff}

  /* ---- mobile breadcrumb: bigger tap targets + cleaner spacing ----
     Links were only 26x17px hit areas (well below the 44px recommended
     touch target), making them very hard to tap. inline-block + padding
     grows the hit area; negative margin keeps the visual layout compact. */
  .crumb{font-size:13.5px;line-height:1.7;padding:12px 0}
  .crumb a{display:inline-block;padding:6px 3px;margin:-4px 0;
    -webkit-tap-highlight-color:rgba(247,127,0,.35);border-radius:4px}
  .crumb a:active{background:rgba(255,255,255,.12)}

  /* ---- mobile footer: restore side padding + section dividers for polish ---- */
  footer .ft > div{padding-bottom:20px;border-bottom:1px solid rgba(255,255,255,.09)}
  footer .ft > div:last-child{padding-bottom:0;border-bottom:none}
  .ft{gap:22px}
}
@media(max-width:560px){
  .grid3,.grid4,.grid2,.steps{grid-template-columns:1fr}
  .hero h1{font-size:26px}
  .topbar{display:none}
  .ft{grid-template-columns:1fr}
}
/* drawer CTA only shows on mobile (hidden on desktop) */
.drawer-cta{display:none}

/* E-E-A-T trust gallery (about/home) */
.trust-gallery{display:grid;grid-template-columns:repeat(2,1fr);gap:18px;margin-top:8px}
.trust-gallery figure{margin:0;background:#f7f9fb;border-radius:10px;overflow:hidden;display:flex;flex-direction:column}
.trust-gallery figure img{width:100%;height:240px;object-fit:cover;display:block}
.trust-gallery figcaption{padding:12px 14px;font-size:14px;color:var(--ink);line-height:1.5}
/* E-E-A-T trust strip (series category pages) */
.trust-strip{display:grid;grid-template-columns:240px 1fr;gap:24px;align-items:center;background:#fff;padding:24px;border-radius:10px;margin-top:24px}
.trust-strip-img{width:100%;height:auto;border-radius:8px;display:block}
/* E-E-A-T certifications gallery (about page) */
.cert-gallery{display:grid;grid-template-columns:repeat(3,1fr);gap:16px;margin-top:8px}
.cert-gallery figure{margin:0;background:#fff;border:1px solid #e6ebf0;border-radius:10px;overflow:hidden;display:flex;flex-direction:column}
.cert-gallery figure img{width:100%;height:300px;object-fit:contain;background:#f3f5f8;display:block}
.cert-gallery figcaption{padding:10px 12px;font-size:13px;color:var(--ink);line-height:1.45;border-top:1px solid #eef1f4}
@media(max-width:560px){
  .grid3,.grid4,.grid2,.steps{grid-template-columns:1fr}
  .hero h1{font-size:26px}
  .topbar{display:none}
  .ft{grid-template-columns:1fr}
  .trust-gallery{grid-template-columns:1fr}
  .trust-gallery figure img{height:200px}
  .cert-gallery{grid-template-columns:1fr}
  .cert-gallery figure img{height:220px}
  .trust-strip{grid-template-columns:1fr;text-align:center}
}

/* ===== UI polish pass (2026-07-31) — additive, zero-layout-risk ===== */
/* sticky-header anchor offset so in-page links aren't hidden under the bar */
.main-col h2, .main-col h3, .qa h3, .side h3{scroll-margin-top:84px}
/* crisper text rendering on WebKit/Blink & Gecko */
body{-webkit-font-smoothing:antialiased;-moz-osx-font-smoothing:grayscale;text-rendering:optimizeLegibility}
/* brand-tinted text selection */
::selection{background:rgba(247,127,0,.18);color:var(--navy)}
/* accessible keyboard focus ring */
a:focus-visible,button:focus-visible,.btn:focus-visible{outline:3px solid var(--orange);outline-offset:2px;border-radius:6px}
/* button depth + press feedback */
.btn{box-shadow:0 6px 18px rgba(247,127,0,.28);transition:background .15s,transform .08s,box-shadow .15s}
.btn:active{transform:translateY(1px);box-shadow:0 3px 10px rgba(247,127,0,.25)}
/* card image subtle zoom on hover (card already clips overflow) */
.card img{transition:transform .35s ease}
.card:hover img{transform:scale(1.04)}
.card:hover{border-color:#cfd8e0}
/* section heading accent underline */
.sec-t h2{position:relative;display:inline-block;padding-bottom:10px}
.sec-t h2::after{content:"";position:absolute;left:50%;transform:translateX(-50%);bottom:0;width:56px;height:3px;background:var(--orange);border-radius:2px}
/* zebra striping for long spec comparison tables */
table.spec tbody tr:nth-child(even){background:#fafbfc}
table.cmp tbody tr:nth-child(even) td{background:#fafbfc}

/* ---- 404 page ---- */
.nf-code{font-size:76px;font-weight:800;letter-spacing:2px;line-height:1;color:var(--orange);opacity:.92;margin-bottom:10px}
.nf-links{display:flex;flex-wrap:wrap;gap:10px;justify-content:center}
.nf-links a{display:inline-block;background:#fff;border:1px solid var(--line);border-radius:999px;padding:9px 18px;color:var(--navy);font-weight:600;font-size:14px;transition:border-color .15s,color .15s,transform .12s}
.nf-links a:hover{border-color:var(--orange);color:var(--orange);transform:translateY(-1px)}
@media(max-width:560px){.nf-code{font-size:56px}.nf-links a{font-size:13px;padding:8px 14px}}

/* ---- 询价表单 ---- */
.inq-form{max-width:580px;margin:18px 0 8px;display:flex;flex-direction:column;gap:14px}
.inq-row{display:flex;gap:14px;flex-wrap:wrap}
.inq-row label{flex:1;min-width:200px;display:flex;flex-direction:column;gap:6px;font-weight:600;font-size:14px;color:var(--navy)}
.inq-form input,.inq-form textarea{width:100%;padding:10px 12px;border:1px solid var(--line);border-radius:8px;font:inherit;font-weight:400;color:var(--navy);background:#fff;box-sizing:border-box}
.inq-form input:focus,.inq-form textarea:focus{outline:none;border-color:var(--orange)}
.inq-form textarea{resize:vertical;min-height:110px}
.inq-form button{align-self:flex-start;background:var(--orange);color:#fff;border:0;padding:12px 30px;border-radius:8px;font-weight:700;font-size:15px;cursor:pointer;transition:background .15s}
.inq-form button:hover{background:var(--orange-d)}
.inq-form button:disabled{opacity:.6;cursor:default}
.inq-msg{font-size:14px;min-height:20px;margin:0}
.inq-msg.ok{color:#1a7f37}.inq-msg.err{color:#c0392b}
.inq-hp{position:absolute;left:-9999px;width:1px;height:1px;overflow:hidden}
@media(max-width:560px){.inq-row{flex-direction:column;gap:12px}.inq-row label{min-width:0}}