:root{
  --navy:#14304A; --navy-deep:#0F2538; --orange:#E36414; --orange-l:#FBE8D7;
  --tx:#20241F; --mut:#5B615A; --grey:#8B928A; --line:#E3E6E8; --bg:#fff; --bg-alt:#F6F7F9;
  --radius:12px; --shadow:0 10px 30px rgba(20,48,74,.08);
}
*{margin:0;padding:0;box-sizing:border-box}
html{scroll-behavior:smooth}
body{font-family:"PingFang SC","Hiragino Sans GB","Microsoft YaHei","Noto Sans SC",sans-serif;
  color:var(--tx);background:var(--bg);line-height:1.7;-webkit-font-smoothing:antialiased}
img{max-width:100%;display:block}
a{color:inherit;text-decoration:none}
html[lang="zh"] .lang-en,html[lang="en"] .lang-zh{display:none}
.container{max-width:1240px;margin:0 auto;padding:0 24px}
.kicker{font-size:12px;font-weight:700;letter-spacing:.28em;color:var(--orange);text-transform:uppercase}

/* topbar */
.topbar{background:var(--navy-deep);color:rgba(255,255,255,.75);font-size:12px}
.topbar-in{display:flex;justify-content:space-between;align-items:center;height:36px;gap:16px}
.topbar-l{display:flex;align-items:center;gap:10px;letter-spacing:.08em;white-space:nowrap;overflow:hidden}
.topbar-sep{opacity:.35}
.topbar-r{display:flex;align-items:center;gap:12px;white-space:nowrap}
.topbar-r a:hover{color:#fff}
.lang-switch{display:inline-flex;background:rgba(255,255,255,.12);border-radius:99px;padding:2px}
.lang-switch a{padding:1px 10px;border-radius:99px;letter-spacing:.05em}
.lang-switch a.on{background:var(--orange);color:#fff}

/* header */
.site-head{position:sticky;top:0;z-index:60;background:rgba(255,255,255,.96);backdrop-filter:blur(8px);
  border-bottom:1px solid var(--line);transition:box-shadow .25s}
.site-head.scrolled{box-shadow:0 6px 20px rgba(20,48,74,.08)}
.head-in{display:flex;align-items:center;gap:28px;height:70px}
.logo{display:flex;align-items:center;gap:10px;flex-shrink:0}
.logo-mark{width:40px;height:40px;background:var(--orange);color:#fff;display:flex;align-items:center;
  justify-content:center;font-weight:800;font-size:15px;letter-spacing:.02em;border-radius:6px}
.logo-tx{display:flex;flex-direction:column;line-height:1.25}
.logo-tx b{font-size:16px;color:var(--navy);letter-spacing:.06em}
.logo-tx i{font-style:normal;font-size:11px;color:var(--grey);letter-spacing:.04em}
.nav{display:flex;gap:26px;margin-left:auto}
.nav-link{font-size:15px;color:var(--tx);padding:6px 2px;position:relative;letter-spacing:.04em}
.nav-link::after{content:"";position:absolute;left:0;bottom:0;height:2px;width:0;background:var(--orange);transition:width .2s}
.nav-link:hover::after,.nav-link.active::after{width:100%}
.nav-link.active{color:var(--navy);font-weight:600}
.head-tel{display:flex;align-items:center;gap:7px;color:var(--navy);font-weight:700;font-size:15px;
  border:1px solid var(--line);padding:8px 16px;border-radius:99px;flex-shrink:0}
.head-tel:hover{border-color:var(--orange);color:var(--orange)}
.menu-btn{display:none;background:none;border:0;width:40px;height:40px;cursor:pointer;flex-direction:column;
  justify-content:center;align-items:center;gap:5px}
.menu-btn span{width:22px;height:2px;background:var(--navy);display:block;transition:.2s}

/* hero */
.hero{position:relative;min-height:600px;height:76vh;display:flex;align-items:center;overflow:hidden;background:var(--navy)}
.hero-bg{position:absolute;inset:0;width:100%;height:100%;object-fit:cover;object-position:center 68%}
.hero-shade{position:absolute;inset:0;background:linear-gradient(90deg,rgba(15,37,56,.92) 0%,rgba(15,37,56,.72) 42%,rgba(15,37,56,.25) 100%)}
.hero-in{position:relative;z-index:2;color:#fff;padding-top:40px;padding-bottom:40px}
.hero-kicker{font-size:13px;letter-spacing:.35em;color:#F0A46A;font-weight:700;margin-bottom:18px}
.hero h1{font-size:clamp(34px,5vw,58px);line-height:1.22;font-weight:800;letter-spacing:.02em}
.hero h1 em{font-style:normal;color:#F0A46A}
.hero-sub{margin-top:20px;max-width:560px;font-size:16px;color:rgba(255,255,255,.82)}
.hero-cta{margin-top:34px;display:flex;gap:14px;flex-wrap:wrap}

/* buttons */
.btn{display:inline-flex;align-items:center;justify-content:center;gap:8px;padding:13px 28px;
  border-radius:8px;font-size:15px;font-weight:600;letter-spacing:.05em;border:1.5px solid transparent;
  cursor:pointer;transition:.2s}
.btn-solid{background:var(--orange);color:#fff}
.btn-solid:hover{background:#C9530C;transform:translateY(-1px)}
.btn-ghost{border-color:rgba(255,255,255,.55);color:#fff}
.btn-ghost:hover{background:rgba(255,255,255,.12)}
.btn-line{border-color:var(--navy);color:var(--navy)}
.btn-line:hover{background:var(--navy);color:#fff}

/* stats */
.stats{background:var(--navy);color:#fff}
.stats-in{display:grid;grid-template-columns:repeat(4,1fr);text-align:center;padding:26px 24px;gap:12px}
.stats-in b{display:block;font-size:34px;font-weight:800;color:#F0A46A;line-height:1.2}
.stats-in div{font-size:13px;color:rgba(255,255,255,.72);letter-spacing:.1em}

/* sections */
.sec{padding:88px 0}
.sec-alt{background:var(--bg-alt)}
.sec-head{max-width:720px;margin-bottom:44px}
.sec-head h2{font-size:clamp(26px,3vw,36px);color:var(--navy);margin-top:10px;letter-spacing:.02em}
.sec-desc{margin-top:12px;color:var(--mut);font-size:15px}
.sec-more{margin-top:40px;text-align:center}

/* tabs */
.tabs{display:flex;gap:10px;flex-wrap:wrap;margin-bottom:34px}
.tab{border:1.5px solid var(--line);background:#fff;border-radius:99px;padding:10px 22px;font-size:15px;
  color:var(--mut);cursor:pointer;display:inline-flex;align-items:center;gap:8px;font-family:inherit;transition:.2s}
.tab i{font-style:normal;font-size:12px;background:var(--bg-alt);border-radius:99px;padding:1px 8px;color:var(--grey)}
.tab:hover{border-color:var(--orange);color:var(--orange)}
.tab.on{background:var(--navy);border-color:var(--navy);color:#fff}
.tab.on i{background:rgba(255,255,255,.16);color:#F0A46A}
.tab-panel{display:none}.tab-panel.on{display:block}
.tab-desc{color:var(--mut);margin-bottom:22px;font-size:14px}

/* product cards */
.p-grid{display:grid;grid-template-columns:repeat(auto-fill,minmax(280px,1fr));gap:24px}
.p-cell{display:grid}
.p-card{background:#fff;border:1px solid var(--line);border-radius:var(--radius);overflow:hidden;
  transition:.25s;display:flex;flex-direction:column}
.p-card:hover{transform:translateY(-4px);box-shadow:var(--shadow);border-color:rgba(227,100,20,.5)}
.p-img{aspect-ratio:16/10;overflow:hidden;background:#F4F5F7}
.p-img img{width:100%;height:100%;object-fit:cover;transition:transform .4s}
.p-card:hover .p-img img{transform:scale(1.05)}
.p-body{padding:20px 22px 22px;display:flex;flex-direction:column;flex:1}
.p-code{color:var(--orange);font-weight:800;font-size:15px;letter-spacing:.08em}
.p-body h3{font-size:18px;color:var(--navy);margin-top:4px;letter-spacing:.02em}
.p-tag{font-size:13px;color:var(--mut);margin-top:6px}
.p-spec{margin-top:auto;padding-top:14px;font-size:12.5px;color:var(--grey);
  border-top:1px dashed var(--line);display:flex;gap:8px;flex-wrap:wrap}
.p-spec span{color:var(--navy);font-weight:600}
.p-more{margin-top:12px;font-size:13px;color:var(--orange);font-weight:600}

/* capabilities */
.cap-grid{display:grid;grid-template-columns:repeat(3,1fr);gap:22px}
.cap-grid.cap-4{grid-template-columns:repeat(2,1fr)}
.cap-card{background:#fff;border:1px solid var(--line);border-radius:var(--radius);padding:28px;transition:.25s}
.cap-card:hover{border-color:rgba(227,100,20,.45);box-shadow:var(--shadow)}
.cap-num{font-size:13px;font-weight:800;color:var(--orange);letter-spacing:.15em}
.cap-card h3{font-size:18px;color:var(--navy);margin:10px 0 8px}
.cap-card p{font-size:14px;color:var(--mut)}

/* materials */
.mat-grid{display:grid;grid-template-columns:repeat(4,1fr);gap:18px}
.mat-card{background:#fff;border:1px solid var(--line);border-radius:var(--radius);padding:26px 22px;text-align:center}
.mat-card h3{font-size:17px;color:var(--navy)}
.mat-card p{font-size:12.5px;color:var(--grey);margin-top:8px}

/* gallery */
.gal-grid{display:grid;grid-template-columns:repeat(3,1fr);gap:20px}
.gal-grid figure{border-radius:var(--radius);overflow:hidden;position:relative;background:var(--navy)}
.gal-grid img{aspect-ratio:4/3;object-fit:cover;width:100%;transition:transform .4s}
.gal-grid figure:hover img{transform:scale(1.04)}
.gal-grid figcaption{position:absolute;left:0;right:0;bottom:0;padding:26px 16px 12px;color:#fff;font-size:13px;
  background:linear-gradient(transparent,rgba(15,37,56,.85));letter-spacing:.06em}

/* cta band */
.cta-band{background:linear-gradient(100deg,var(--navy-deep),var(--navy));color:#fff;padding:64px 0;position:relative;overflow:hidden}
.cta-band::after{content:"";position:absolute;right:-120px;top:-120px;width:340px;height:340px;border-radius:50%;
  border:1.5px solid rgba(227,100,20,.4)}
.cta-in{display:flex;align-items:center;justify-content:space-between;gap:30px;flex-wrap:wrap;position:relative;z-index:2}
.cta-band h2{font-size:clamp(22px,3vw,30px);letter-spacing:.03em}
.cta-band p{color:rgba(255,255,255,.72);margin-top:8px;font-size:15px}
.cta-btns{display:flex;gap:14px;flex-wrap:wrap}

/* page hero */
.page-hero{background:var(--navy);color:#fff;padding:64px 0 56px;position:relative;overflow:hidden}
.page-hero::after{content:"";position:absolute;right:-80px;bottom:-140px;width:300px;height:300px;border-radius:50%;
  border:1.5px solid rgba(255,255,255,.12)}
.page-hero h1{font-size:clamp(28px,4vw,42px);margin-top:12px;letter-spacing:.02em}
.page-hero h1 em{color:#F0A46A;font-style:normal}
.page-hero p{color:rgba(255,255,255,.72);margin-top:12px;max-width:640px;font-size:15px}
.crumbs{font-size:13px;color:rgba(255,255,255,.55);display:flex;gap:10px;flex-wrap:wrap;margin-bottom:18px}
.crumbs a:hover{color:#F0A46A}
.crumbs b{color:#F0A46A}

/* product detail */
.pd-hero{padding-bottom:40px}
.pd-grid{display:grid;grid-template-columns:1.15fr 1fr;gap:44px;align-items:start}
.pd-img{position:relative;border-radius:var(--radius);overflow:hidden;background:#F4F5F7}
.pd-img img{width:100%;aspect-ratio:4/3;object-fit:cover}
.pd-badge{position:absolute;top:16px;right:16px;background:rgba(20,48,74,.88);color:#fff;
  padding:8px 16px;border-radius:6px;font-size:13px;letter-spacing:.1em;font-weight:600}
.pd-info h2{font-size:26px;color:var(--navy);margin-top:8px}
.pd-intro{margin-top:14px;font-size:15px;color:var(--tx);line-height:1.9}
.pd-intro b.hl{color:var(--orange);font-weight:700}
.hl-list{margin-top:22px;display:flex;flex-direction:column;gap:12px}
.hl-item{display:flex;gap:12px;align-items:flex-start;font-size:14.5px}
.hl-dot{width:9px;height:9px;border-radius:50%;background:var(--orange);flex-shrink:0;margin-top:8px}
.pd-cta{margin-top:28px;display:flex;gap:12px;flex-wrap:wrap}
.pd-specs{display:grid;grid-template-columns:1.2fr 1fr;gap:44px;align-items:start}
.pd-specs h2{font-size:26px;color:var(--navy);margin-top:8px;margin-bottom:20px}
.spec-table{background:#fff;border:1px solid var(--line);border-radius:var(--radius);overflow:hidden}
.spec-row{display:flex;justify-content:space-between;gap:20px;padding:15px 22px;border-bottom:1px dashed var(--line);font-size:14.5px}
.spec-row:last-child{border-bottom:0}
.spec-key{color:var(--mut)}
.spec-val{color:var(--navy);font-weight:700;text-align:right}
.app-card{background:var(--orange-l);border-left:4px solid var(--orange);border-radius:var(--radius);padding:28px}
.app-card h3{color:#A8510A;font-size:17px;margin-bottom:12px;letter-spacing:.04em}
.app-card p{font-size:14.5px;color:#3A3A3A;line-height:1.9}
.d-grid{display:grid;grid-template-columns:repeat(3,1fr);gap:20px}
.d-card{border:1px solid var(--line);border-radius:var(--radius);overflow:hidden;background:#fff;cursor:zoom-in}
.d-img img{width:100%;aspect-ratio:4/3;object-fit:cover;transition:transform .4s}
.d-card:hover .d-img img{transform:scale(1.04)}
.d-card figcaption{text-align:center;padding:12px;font-size:13px;color:var(--tx);font-weight:600;border-top:1px solid var(--line)}
.pd-nav-in{display:grid;grid-template-columns:1fr 1fr;gap:20px}
.pn-card{background:#fff;border:1px solid var(--line);border-radius:var(--radius);padding:20px 24px;transition:.2s}
.pn-card:hover{border-color:var(--orange)}
.pn-card span{font-size:12.5px;color:var(--grey);display:block}
.pn-card b{color:var(--navy);font-size:15px}
.pn-next{text-align:right}

/* about */
.about-grid{display:grid;grid-template-columns:1fr 1.1fr;gap:48px;align-items:center}
.about-photo img{border-radius:var(--radius);aspect-ratio:4/4.6;object-fit:cover}
.about-photo{position:relative}
.about-photo figcaption{margin-top:10px;font-size:12.5px;color:var(--grey);text-align:center;letter-spacing:.08em}
.about-tx h2{font-size:clamp(24px,3vw,32px);color:var(--navy);margin-top:10px}
.lead{margin-top:16px;font-size:15.5px;line-height:2;color:var(--tx)}
.lead b.hl{color:var(--orange)}
.about-stats{display:grid;grid-template-columns:repeat(4,1fr);gap:10px;margin-top:28px;
  border-top:1px solid var(--line);padding-top:24px;text-align:center}
.about-stats b{display:block;font-size:28px;color:var(--orange);font-weight:800}
.about-stats span{font-size:12.5px;color:var(--grey);letter-spacing:.06em}
.ms-list{max-width:760px}
.ms-item{display:flex;gap:26px;align-items:baseline;padding:22px 0;border-bottom:1px dashed var(--line)}
.ms-item:last-child{border-bottom:0}
.ms-year{font-size:26px;font-weight:800;color:var(--orange);min-width:96px}
.ms-tx{color:var(--tx);font-size:15px}

/* applications */
.mat-list{display:flex;flex-direction:column;gap:14px}
.mat-row{display:grid;grid-template-columns:280px 1fr;gap:24px;align-items:center;
  background:#fff;border:1px solid var(--line);border-radius:var(--radius);padding:22px 26px}
.mat-name h3{font-size:17px;color:var(--navy)}
.mat-name p{font-size:12.5px;color:var(--grey);margin-top:4px}
.mat-models{display:flex;gap:8px;flex-wrap:wrap}
.mat-models a{font-size:13px;font-weight:700;color:var(--navy);border:1.5px solid var(--line);
  border-radius:99px;padding:6px 16px;letter-spacing:.06em;transition:.2s}
.mat-models a:hover{border-color:var(--orange);color:var(--orange)}
.steps-grid{display:grid;grid-template-columns:repeat(3,1fr);gap:22px}
.step{background:#fff;border:1px solid var(--line);border-radius:var(--radius);padding:26px;display:flex;gap:16px}
.step-num{font-size:22px;font-weight:800;color:var(--orange);opacity:.9}
.step h3{font-size:16px;color:var(--navy)}
.step p{font-size:13.5px;color:var(--mut);margin-top:6px}
.faq-list{max-width:820px;display:flex;flex-direction:column;gap:12px}
.faq{background:#fff;border:1px solid var(--line);border-radius:var(--radius);padding:18px 24px}
.faq summary{cursor:pointer;font-weight:600;color:var(--navy);font-size:15.5px;display:flex;justify-content:space-between;align-items:center;list-style:none}
.faq summary::-webkit-details-marker{display:none}
.faq summary i{font-style:normal;color:var(--orange);font-size:20px;transition:.2s}
.faq[open] summary i{transform:rotate(45deg)}
.faq p{margin-top:12px;font-size:14px;color:var(--mut);line-height:1.9}

/* contact */
.contact-grid{display:grid;grid-template-columns:1fr 1.15fr;gap:44px;align-items:start}
.contact-cards{display:grid;grid-template-columns:1fr 1fr;gap:16px}
.c-card{background:#fff;border:1px solid var(--line);border-radius:var(--radius);padding:24px}
.c-card h3{font-size:13px;color:var(--grey);letter-spacing:.16em;font-weight:600}
.c-big{margin-top:10px;font-size:21px;font-weight:700;color:var(--navy)}
.c-big a:hover{color:var(--orange)}
.c-sub{margin-top:6px;font-size:13px;color:var(--mut)}
.c-addr{margin-top:8px;font-size:14.5px;color:var(--tx);line-height:1.8}
.c-qr{text-align:center}
.c-qr img{width:120px;margin:6px auto 10px;border:1px solid var(--line);border-radius:8px;padding:6px}
.c-qr p{font-size:12.5px;color:var(--grey)}
.contact-form-wrap{background:#fff;border:1px solid var(--line);border-radius:var(--radius);padding:34px}
.contact-form-wrap h2{font-size:24px;color:var(--navy)}
.form-tip{font-size:13px;color:var(--grey);margin-top:8px}
.c-form{margin-top:22px;display:flex;flex-direction:column;gap:16px}
.c-form label{display:flex;flex-direction:column;gap:7px;font-size:13.5px;color:var(--mut);font-weight:600}
.c-form input,.c-form select,.c-form textarea{font-family:inherit;font-size:14.5px;padding:12px 14px;
  border:1.5px solid var(--line);border-radius:8px;color:var(--tx);background:var(--bg);transition:.2s}
.c-form input:focus,.c-form select:focus,.c-form textarea:focus{outline:none;border-color:var(--orange)}
.c-form .btn{align-self:flex-start}

/* footer */
.footer{background:var(--navy-deep);color:rgba(255,255,255,.66);margin-top:0}
.foot-grid{display:grid;grid-template-columns:1.3fr .8fr .8fr 1.3fr .9fr;gap:30px;padding:56px 24px 40px}
.foot-brand .logo-mark{width:44px;height:44px}
.foot-pos{margin-top:14px;font-size:13px;letter-spacing:.06em}
.foot-slogan{margin-top:4px;font-size:13px;color:#F0A46A;letter-spacing:.1em}
.foot-since{margin-top:6px;font-size:11px;letter-spacing:.3em;color:rgba(255,255,255,.35)}
.foot-col h4{color:#fff;font-size:14px;letter-spacing:.14em;margin-bottom:16px;font-weight:600}
.foot-col a,.foot-col p{display:block;font-size:13.5px;padding:4px 0;color:rgba(255,255,255,.66)}
.foot-col a:hover{color:#F0A46A}
.foot-qr{text-align:center}
.qr-box{background:#fff;border-radius:10px;padding:8px;width:120px;margin:0 auto}
.qr-box img{width:100%;border-radius:4px}
.foot-qr p{font-size:12px;margin-top:10px}
.foot-bottom{display:flex;justify-content:space-between;gap:12px;flex-wrap:wrap;
  border-top:1px solid rgba(255,255,255,.12);padding-top:18px;padding-bottom:22px;font-size:12px;
  color:rgba(255,255,255,.42);letter-spacing:.05em}
.foot-bottom a{color:inherit;text-decoration:none;border-bottom:1px dashed rgba(255,255,255,.28)}
.foot-bottom a:hover{color:#fff;border-bottom-color:var(--orange)}

/* mobile bar */
.m-bar{display:none;position:fixed;left:0;right:0;bottom:0;z-index:70;background:var(--navy);
  grid-template-columns:1fr 1fr 1fr;padding-bottom:env(safe-area-inset-bottom)}
.m-bar a{color:#fff;text-align:center;padding:13px 4px;font-size:13.5px;letter-spacing:.06em}
.m-bar a+a{border-left:1px solid rgba(255,255,255,.14)}
.m-bar a:nth-child(1){color:#F0A46A;font-weight:700}

/* lightbox */
.lightbox{position:fixed;inset:0;background:rgba(10,22,34,.92);display:none;align-items:center;
  justify-content:center;z-index:90;padding:4vh 4vw}
.lightbox.on{display:flex}
.lightbox img{max-width:100%;max-height:100%;border-radius:8px}
.lb-close{position:absolute;top:18px;right:26px;background:none;border:0;color:#fff;font-size:40px;cursor:pointer;line-height:1}

/* responsive */
@media (max-width:1024px){
  .cap-grid,.steps-grid{grid-template-columns:repeat(2,1fr)}
  .mat-grid{grid-template-columns:repeat(2,1fr)}
  .foot-grid{grid-template-columns:1fr 1fr;gap:24px}
  .pd-grid,.pd-specs,.about-grid,.contact-grid{grid-template-columns:1fr;gap:32px}
  .about-photo img{aspect-ratio:16/10}
}
@media (max-width:900px){
  .topbar{display:none}
  .nav{position:fixed;top:70px;left:0;right:0;background:#fff;flex-direction:column;gap:0;
    padding:10px 24px 18px;border-bottom:1px solid var(--line);display:none;box-shadow:0 20px 30px rgba(20,48,74,.12)}
  .nav.open{display:flex}
  .nav-link{padding:13px 2px;border-bottom:1px solid var(--bg-alt);font-size:16px}
  .nav-link::after{display:none}
  .head-tel{margin-left:auto}
  .menu-btn{display:flex}
  .head-in{gap:16px}
  body{padding-bottom:52px}
  .m-bar{display:grid}
}
@media (max-width:640px){
  .head-tel{display:none}
  .menu-btn{margin-left:auto}
  .sec{padding:60px 0}
  .stats-in{grid-template-columns:repeat(2,1fr);row-gap:20px}
  .hero{min-height:520px;height:70vh}
  .cap-grid,.cap-grid.cap-4,.steps-grid,.gal-grid,.d-grid,.p-grid{grid-template-columns:1fr}
  .mat-grid{grid-template-columns:repeat(2,1fr)}
  .mat-row{grid-template-columns:1fr;gap:12px}
  .spec-row{flex-direction:column;gap:3px;align-items:flex-start}
  .spec-val{text-align:left}
  .spec-row{flex-direction:column;gap:3px;align-items:flex-start}
  .spec-val{text-align:left}
  .contact-cards{grid-template-columns:1fr}
  .pd-nav-in{grid-template-columns:1fr}
  .pn-next{text-align:left}
  .cta-in{flex-direction:column;align-items:flex-start}
  .foot-grid{grid-template-columns:1fr;padding:40px 24px 30px}
}