:root{
  --red:#C00000; --red-dark:#9a0000; --red-soft:#fdf2f2;
  --navy:#1F3350; --ink:#333; --gray:#6b7280;
  --bg:#f7f8fa; --line:#e8e8ec; --white:#fff;
  --serif:"Kaiti SC","STKaiti","KaiTi","楷体","Noto Serif SC",serif;
  --sans:"Microsoft YaHei","PingFang SC","Segoe UI",sans-serif;
  --shadow:0 6px 24px rgba(31,51,80,.08);
}
*{margin:0;padding:0;box-sizing:border-box}
html{scroll-behavior:smooth}
body{font-family:var(--sans);color:var(--ink);background:var(--bg);line-height:1.75;font-size:15px}
img{max-width:100%;display:block}
a{color:inherit;text-decoration:none}
.container{max-width:1160px;margin:0 auto;padding:0 24px}

/* ===== header ===== */
header{position:fixed;top:0;left:0;right:0;z-index:100;background:rgba(255,255,255,.96);backdrop-filter:blur(8px);border-bottom:1px solid var(--line);transition:box-shadow .3s}
header.scrolled{box-shadow:0 4px 18px rgba(0,0,0,.08)}
.nav{display:flex;align-items:center;justify-content:space-between;height:66px}
.brand{display:flex;align-items:center;gap:10px}
.brand img{height:40px;width:auto}
.brand .cn{font-family:var(--serif);font-size:22px;color:var(--red);font-weight:700;letter-spacing:2px}
.brand .en{font-size:12px;color:var(--gray);letter-spacing:.5px;line-height:1.2}
nav.menu{display:flex;gap:26px}
nav.menu a{font-size:14.5px;color:var(--navy);position:relative;padding:6px 0}
nav.menu a::after{content:"";position:absolute;left:0;bottom:0;width:0;height:2px;background:var(--red);transition:width .25s}
nav.menu a:hover::after{width:100%}
nav.menu a:hover{color:var(--red)}
.burger{display:none;flex-direction:column;gap:5px;cursor:pointer;background:none;border:0}
.burger span{width:22px;height:2px;background:var(--navy)}

/* ===== hero ===== */
.hero{margin-top:66px;background:linear-gradient(135deg,#fff 55%,var(--red-soft) 100%);position:relative;overflow:hidden}
.hero::before{content:"";position:absolute;right:-140px;top:-140px;width:420px;height:420px;border:2px solid rgba(192,0,0,.10);border-radius:50%}
.hero::after{content:"";position:absolute;right:-60px;top:-60px;width:260px;height:260px;border:2px solid rgba(192,0,0,.14);border-radius:50%}
.hero-inner{display:grid;grid-template-columns:1.15fr .85fr;gap:48px;align-items:center;padding:72px 0 84px}
.hero-tag{display:inline-flex;align-items:center;gap:8px;color:var(--red);font-size:13px;letter-spacing:3px;border:1px solid rgba(192,0,0,.35);padding:5px 14px;border-radius:999px;margin-bottom:22px}
.hero h1{font-family:var(--serif);font-size:52px;color:var(--navy);line-height:1.2;letter-spacing:4px}
.hero h1 em{font-style:normal;color:var(--red)}
.hero .sub-en{font-size:15px;color:var(--gray);letter-spacing:1px;margin:14px 0 20px}
.hero p.lead{font-size:16.5px;color:#444;max-width:560px}
.hero-chips{display:flex;flex-wrap:wrap;gap:10px;margin:26px 0 34px}
.chip{background:#fff;border:1px solid var(--line);border-radius:8px;padding:8px 14px;font-size:13.5px;color:var(--navy);box-shadow:var(--shadow)}
.chip b{color:var(--red);font-weight:700}
.btns{display:flex;gap:14px;flex-wrap:wrap}
.btn{padding:12px 30px;border-radius:6px;font-size:15px;letter-spacing:2px;transition:.25s}
.btn-red{background:var(--red);color:#fff}
.btn-red:hover{background:var(--red-dark);transform:translateY(-2px);box-shadow:0 8px 20px rgba(192,0,0,.25)}
.btn-ghost{border:1.5px solid var(--navy);color:var(--navy)}
.btn-ghost:hover{background:var(--navy);color:#fff}
.hero-visual{position:relative}
.hero-visual .frame{position:relative;border-radius:10px;overflow:hidden;box-shadow:0 20px 50px rgba(31,51,80,.22)}
.hero-visual .frame::before{content:"";position:absolute;inset:0;border:1px solid rgba(255,255,255,.4);border-radius:10px;z-index:2;pointer-events:none}
.hero-visual .corner{position:absolute;width:56px;height:56px;border:3px solid var(--red);z-index:3}
.hero-visual .c1{top:-10px;left:-10px;border-right:0;border-bottom:0}
.hero-visual .c2{bottom:-10px;right:-10px;border-left:0;border-top:0}
.hero-visual img{height:420px;width:100%;object-fit:cover}

/* ===== section scaffold ===== */
section{padding:78px 0}
.sec-head{text-align:center;margin-bottom:46px}
.sec-head .en{font-size:13px;letter-spacing:3px;color:var(--gray);text-transform:uppercase}
.sec-head h2{font-family:var(--serif);font-size:34px;color:var(--navy);letter-spacing:3px;margin-top:8px;display:inline-flex;align-items:center;gap:16px}
.sec-head h2::before,.sec-head h2::after{content:"";width:34px;height:2px;background:var(--red)}
.sec-head p.desc{max-width:760px;margin:14px auto 0;color:var(--gray);font-size:14.5px}
.white{background:#fff}

/* ===== about ===== */
.about-grid{display:grid;grid-template-columns:1fr 1fr;gap:44px;align-items:center}
.about-img{position:relative}
.about-img img{border-radius:10px;box-shadow:var(--shadow)}
.about-img .stamp{position:absolute;right:-14px;bottom:-18px;background:var(--red);color:#fff;font-family:var(--serif);padding:14px 20px;border-radius:8px;font-size:15px;letter-spacing:2px;box-shadow:0 10px 26px rgba(192,0,0,.3)}
.about-txt h3{font-family:var(--serif);font-size:24px;color:var(--navy);margin-bottom:16px;letter-spacing:1px}
.about-txt p{margin-bottom:12px;text-align:justify}
.about-txt .hl{color:var(--red);font-weight:600}
.stats{display:grid;grid-template-columns:repeat(4,1fr);gap:18px;margin-top:48px}
.stat{background:#fff;border:1px solid var(--line);border-radius:10px;text-align:center;padding:26px 10px;box-shadow:var(--shadow)}
.stat .num{font-size:38px;font-weight:700;color:var(--red);font-family:Georgia,serif}
.stat .num small{font-size:18px}
.stat .lab{font-size:13.5px;color:var(--gray);margin-top:4px}

/* ===== products ===== */
.prod-grid{display:grid;grid-template-columns:repeat(3,1fr);gap:26px}
.prod-card{background:#fff;border-radius:12px;overflow:hidden;border:1px solid var(--line);transition:.3s;box-shadow:var(--shadow)}
.prod-card:hover{transform:translateY(-6px);box-shadow:0 16px 40px rgba(31,51,80,.16)}
.prod-card .ph{height:230px;overflow:hidden;position:relative}
.prod-card .ph img{width:100%;height:100%;object-fit:cover;transition:transform .5s}
.prod-card:hover .ph img{transform:scale(1.06)}
.prod-card .no{position:absolute;top:14px;left:14px;width:34px;height:34px;border-radius:50%;background:var(--red);color:#fff;display:flex;align-items:center;justify-content:center;font-weight:700}
.prod-card .bd{padding:22px 24px 26px}
.prod-card h3{font-family:var(--serif);font-size:21px;color:var(--navy);letter-spacing:1px;margin-bottom:8px}
.prod-card .en{font-size:12px;color:var(--gray);letter-spacing:1px;margin-bottom:12px}
.prod-card ul{list-style:none}
.prod-card li{padding-left:18px;position:relative;font-size:14px;color:#444;margin-bottom:6px}
.prod-card li::before{content:"";position:absolute;left:0;top:11px;width:7px;height:7px;background:var(--red);border-radius:1px;transform:rotate(45deg)}

/* ===== radar ===== */
.radar{background:var(--navy);color:#e8ecf4;position:relative;overflow:hidden}
.radar .sec-head h2{color:#fff}
.radar .sec-head .en{color:#8fa3c2}
.radar .sec-head h2::before,.radar .sec-head h2::after{background:var(--red)}
.radar-grid{display:grid;grid-template-columns:1fr 1fr;gap:44px;align-items:center}
.radar-txt p{margin-bottom:14px;text-align:justify;color:#c9d4e6}
.radar-txt b{color:#fff}
.radar-imgs{display:grid;grid-template-columns:1fr 1.4fr;gap:14px}
.radar-imgs img{border-radius:8px;height:100%;object-fit:cover;box-shadow:0 12px 30px rgba(0,0,0,.35)}
.triangle{display:grid;grid-template-columns:repeat(3,1fr);gap:20px;margin-top:52px}
.tri-item{background:rgba(255,255,255,.06);border:1px solid rgba(255,255,255,.14);border-radius:10px;padding:22px;text-align:center}
.tri-item .t{font-family:var(--serif);font-size:19px;color:#fff;letter-spacing:2px}
.tri-item .d{font-size:13px;color:#9fb0cb;margin-top:6px}
.tri-note{text-align:center;margin-top:22px;font-size:14px;color:#9fb0cb}
.tri-note b{color:#ff9d9d}

/* ===== cases ===== */
.case{background:#fff;border:1px solid var(--line);border-radius:14px;overflow:hidden;margin-bottom:34px;box-shadow:var(--shadow)}
.case-top{display:grid;grid-template-columns:340px 1fr;min-height:200px}
.case-top .ph{position:relative;min-height:200px}
.case-top .ph img{position:absolute;inset:0;width:100%;height:100%;object-fit:cover}
.case-top .info{padding:26px 30px}
.case-top h3{font-family:var(--serif);font-size:24px;color:var(--red);letter-spacing:2px}
.case-top .en{font-size:12px;color:var(--gray);letter-spacing:1px;margin-bottom:12px}
.req{display:flex;flex-wrap:wrap;gap:8px}
.req span{background:var(--red-soft);color:var(--red-dark);font-size:13px;padding:5px 12px;border-radius:6px;border:1px solid rgba(192,0,0,.15)}
.spec-toggle{width:100%;text-align:left;background:#fafbfc;border:0;border-top:1px solid var(--line);padding:16px 30px;font-size:14.5px;color:var(--navy);cursor:pointer;display:flex;justify-content:space-between;align-items:center;font-family:var(--sans)}
.spec-toggle:hover{background:#f2f4f8}
.spec-toggle .arr{transition:.3s;color:var(--red);font-size:12px}
.case.open .spec-toggle .arr{transform:rotate(180deg)}
.spec-table{display:none;padding:6px 30px 26px}
.case.open .spec-table{display:block}
.spec-table table{width:100%;border-collapse:collapse;font-size:14px}
.spec-table td{border:1px solid #e3e6ec;padding:9px 14px}
.spec-table td:first-child{width:150px;background:#f7f8fa;color:var(--navy);font-weight:600;white-space:nowrap}
.spec-table tr:hover td{background:#fdf7f7}

/* ===== tech ===== */
.tech-cols{display:grid;grid-template-columns:repeat(3,1fr);gap:26px;margin-bottom:52px}
.tech-col{background:#fff;border-radius:12px;border:1px solid var(--line);padding:30px 28px;box-shadow:var(--shadow);border-top:4px solid var(--red)}
.tech-col h3{font-family:var(--serif);font-size:22px;color:var(--red);letter-spacing:3px;text-align:center;margin-bottom:18px}
.tech-col dt{font-weight:700;color:var(--navy);font-size:15px;margin-top:12px}
.tech-col dd{font-size:13.5px;color:#555;padding-left:12px;border-left:2px solid #f0d9d9;margin-top:3px}
.mini-grid{display:grid;grid-template-columns:1.05fr .95fr;gap:44px;align-items:center}
.mini-txt h3{font-family:var(--serif);font-size:24px;color:var(--navy);margin-bottom:14px;letter-spacing:1px}
.mini-txt .step{display:flex;gap:14px;margin-bottom:14px}
.mini-txt .step .n{flex:0 0 26px;height:26px;border-radius:50%;background:var(--red);color:#fff;display:flex;align-items:center;justify-content:center;font-size:13px;font-weight:700;margin-top:3px}
.mini-txt .step p{font-size:14px;color:#444;text-align:justify}
.mini-txt .case50{margin-top:18px;background:var(--red-soft);border-left:4px solid var(--red);padding:14px 18px;border-radius:0 8px 8px 0;font-size:13.5px}
.mini-txt .case50 b{color:var(--red)}
.mini-imgs{display:grid;grid-template-columns:1fr 1fr;gap:14px}
.mini-imgs img{border-radius:8px;box-shadow:var(--shadow);height:190px;width:100%;object-fit:cover}

/* ===== quality ===== */
.q-grid{display:grid;grid-template-columns:1fr 1fr;gap:44px;align-items:center}
.certs{display:flex;gap:18px}
.certs img{width:46%;border-radius:8px;box-shadow:var(--shadow);border:1px solid var(--line)}
.q-txt h3{font-family:var(--serif);font-size:24px;color:var(--navy);margin-bottom:14px}
.q-badges{display:flex;gap:12px;margin:18px 0 22px;flex-wrap:wrap}
.q-badges span{border:1.5px solid var(--red);color:var(--red);font-size:13.5px;padding:7px 16px;border-radius:999px;letter-spacing:1px}
.equip{background:#fff;border:1px solid var(--line);border-radius:10px;padding:20px 24px;box-shadow:var(--shadow)}
.equip h4{font-size:15px;color:var(--red);margin-bottom:10px;letter-spacing:1px}
.equip p{font-size:14px;color:#555}

/* ===== gallery ===== */
.gal-tabs{display:flex;justify-content:center;gap:14px;margin-bottom:30px}
.gal-tabs button{padding:10px 34px;border-radius:999px;border:1.5px solid var(--line);background:#fff;color:var(--navy);font-size:15px;letter-spacing:2px;cursor:pointer;transition:.25s;font-family:var(--serif)}
.gal-tabs button.active{background:var(--red);border-color:var(--red);color:#fff}
.gal-grid{display:grid;grid-template-columns:repeat(4,1fr);gap:14px}
.gal-grid a{border-radius:8px;overflow:hidden;position:relative;display:block;box-shadow:var(--shadow)}
.gal-grid img{height:170px;width:100%;object-fit:cover;transition:transform .4s}
.gal-grid a:hover img{transform:scale(1.08)}
.gal-panel{display:none}
.gal-panel.active{display:block}

/* lightbox */
.lb{position:fixed;inset:0;background:rgba(15,20,30,.92);z-index:200;display:none;align-items:center;justify-content:center;padding:40px}
.lb.show{display:flex}
.lb img{max-width:92vw;max-height:88vh;border-radius:6px}
.lb .x{position:absolute;top:22px;right:30px;color:#fff;font-size:34px;cursor:pointer;line-height:1}

/* ===== partners ===== */
.world{background:#fff}
.country-grid{display:grid;grid-template-columns:repeat(4,1fr);gap:20px}
.country{background:var(--bg);border:1px solid var(--line);border-radius:10px;padding:26px 16px;text-align:center;transition:.3s}
.country:hover{border-color:var(--red);transform:translateY(-4px);box-shadow:var(--shadow)}
.country .flag{font-size:30px}
.country .name{font-size:16.5px;color:var(--navy);margin-top:8px;font-weight:600;letter-spacing:1px}
.country .pin{color:var(--red);font-size:12px;letter-spacing:2px;margin-top:4px}

/* ===== contact ===== */
.contact-panel{display:grid;grid-template-columns:1.1fr .9fr;border-radius:16px;overflow:hidden;box-shadow:0 18px 50px rgba(31,51,80,.18)}
.contact-info{background:var(--red);color:#fff;padding:52px 48px}
.contact-info h3{font-family:var(--serif);font-size:30px;letter-spacing:3px;margin-bottom:6px}
.contact-info .en{font-size:13px;opacity:.85;letter-spacing:1px;margin-bottom:30px}
.c-row{display:flex;gap:14px;margin-bottom:20px;font-size:15px}
.c-row .ic{flex:0 0 38px;height:38px;border-radius:50%;background:rgba(255,255,255,.16);display:flex;align-items:center;justify-content:center}
.c-row a{border-bottom:1px dashed rgba(255,255,255,.55);padding-bottom:1px}
.c-row a:hover{border-bottom-style:solid;border-bottom-color:#fff}
.contact-photo{position:relative;min-height:380px}
.contact-photo img{position:absolute;inset:0;width:100%;height:100%;object-fit:cover}

/* ===== footer ===== */
footer{background:#141d2c;color:#8b98ad;padding:34px 0;text-align:center;font-size:13px}
footer .f-brand{font-family:var(--serif);color:#fff;font-size:18px;letter-spacing:3px;margin-bottom:6px}
footer .f-brand em{font-style:normal;color:var(--red)}

/* reveal */
.reveal{opacity:0;transform:translateY(26px);transition:opacity .7s ease,transform .7s ease}
.reveal.in{opacity:1;transform:none}

/* ===== responsive ===== */
@media (max-width:960px){
  .hero-inner,.about-grid,.radar-grid,.mini-grid,.q-grid{grid-template-columns:1fr}
  .prod-grid,.tech-cols{grid-template-columns:1fr 1fr}
  .gal-grid,.country-grid,.stats{grid-template-columns:repeat(2,1fr)}
  .case-top{grid-template-columns:1fr}
  .case-top .ph{height:210px;position:relative}
  .contact-panel{grid-template-columns:1fr}
  .hero h1{font-size:38px}
  nav.menu{position:fixed;top:66px;right:0;background:#fff;flex-direction:column;padding:18px 34px;gap:16px;box-shadow:0 10px 30px rgba(0,0,0,.12);display:none}
  nav.menu.open{display:flex}
  .burger{display:flex}
  .hero-visual img{height:300px}
}
@media (max-width:600px){
  .prod-grid,.tech-cols,.gal-grid,.country-grid{grid-template-columns:1fr}
  section{padding:56px 0}
  .hero h1{font-size:32px}
}
/* ===== 子页页头（Product / Cases / Tech 共用）===== */
.page-head{background:linear-gradient(135deg,#1F3350 0%,#2b4568 58%,#39597f 100%);color:#fff;padding:120px 0 48px;position:relative;overflow:hidden}
.page-head::after{content:"";position:absolute;right:-140px;top:-140px;width:460px;height:460px;border:1px solid rgba(255,255,255,.13);border-radius:50%;pointer-events:none}
.page-head::before{content:"";position:absolute;right:40px;bottom:-90px;width:240px;height:240px;border:1px solid rgba(255,255,255,.08);border-radius:50%;pointer-events:none}
.page-head .container{position:relative;z-index:2}
.page-head .crumb{font-size:12.5px;color:rgba(255,255,255,.6);margin-bottom:16px;letter-spacing:.04em}
.page-head .crumb a{color:rgba(255,255,255,.82)}
.page-head .crumb a:hover{color:#fff;text-decoration:underline}
.page-head .crumb i{font-style:normal;margin:0 7px;opacity:.5}
.page-head .en{font-size:12px;letter-spacing:.26em;text-transform:uppercase;color:#ff9d9d;margin-bottom:10px}
.page-head h1{font-family:var(--serif);font-size:36px;line-height:1.35;color:#fff;letter-spacing:2px;margin-bottom:18px}
.page-head .lead p{color:rgba(255,255,255,.82);font-size:15px;line-height:1.85;max-width:820px;margin-bottom:12px;text-align:justify}
.page-head .lead b{color:#fff}
.page-head .lead .hl{color:#ffb3b3}
.page-head .kw{display:flex;flex-wrap:wrap;gap:9px;margin-top:22px}
.page-head .kw span{font-size:12.5px;padding:5px 14px;border:1px solid rgba(255,255,255,.28);border-radius:20px;color:rgba(255,255,255,.9);background:rgba(255,255,255,.05)}

/* ===== 首页延伸阅读按钮 ===== */
.more-link{margin-top:34px;text-align:center}
.more-link a{display:inline-flex;align-items:center;gap:9px;font-size:14px;color:var(--red);border:1px solid var(--red);padding:10px 26px;border-radius:24px;transition:.25s;letter-spacing:1px}
.more-link a::after{content:"→";transition:.25s}
.more-link a:hover{background:var(--red);color:#fff}
.more-link a:hover::after{transform:translateX(4px)}

/* ===== 子页跨页引导 ===== */
.xlink{background:#fff;border-top:1px solid var(--line);padding:40px 0}
.xlink .hd{text-align:center;color:var(--gray);font-size:14px;margin-bottom:22px}
.xlink .grid{display:flex;flex-wrap:wrap;gap:16px;justify-content:center}
.xlink a{flex:1 1 260px;max-width:380px;border:1px solid var(--line);border-radius:10px;padding:20px 22px;background:var(--bg);transition:.25s}
.xlink a:hover{border-color:var(--red);background:var(--red-soft);transform:translateY(-2px)}
.xlink a b{display:block;font-size:15.5px;color:var(--navy);margin-bottom:7px;font-family:var(--serif);letter-spacing:1px}
.xlink a span{font-size:13px;color:var(--gray);line-height:1.7}

/* ===== 页脚站内导航 ===== */
.sitemap-links{margin-top:18px;padding-top:16px;border-top:1px solid rgba(255,255,255,.12);display:flex;flex-wrap:wrap;gap:8px 20px;justify-content:center;font-size:13px}
.sitemap-links a{color:#9aa7bc}
.sitemap-links a:hover{color:#fff;text-decoration:underline}

@media (max-width:960px){
  .page-head{padding:104px 0 40px}
  .page-head h1{font-size:29px}
  .page-head .lead p{font-size:14.5px}
}
@media (max-width:600px){
  .page-head{padding:96px 0 34px}
  .page-head h1{font-size:24px}
  .page-head .kw span{font-size:12px;padding:4px 11px}
  .xlink a{max-width:none}
}

/* ===== 英文页专用覆盖（html[lang="en"] 作用域，不影响中文页）===== */
html[lang="en"]{--serif:"Segoe UI","Helvetica Neue",Helvetica,Arial,sans-serif;--sans:"Segoe UI","Helvetica Neue",Helvetica,Arial,sans-serif}
html[lang="en"] .hero h1{font-size:44px;letter-spacing:0;line-height:1.22}
html[lang="en"] .page-head h1{letter-spacing:0;font-size:34px}
html[lang="en"] .sec-head h2{letter-spacing:0;font-size:30px}
html[lang="en"] .hero-tag{letter-spacing:1.5px}
html[lang="en"] .brand .cn{letter-spacing:.5px}
html[lang="en"] .page-head .lead p{text-align:left}
html[lang="en"] .country .name{letter-spacing:0;font-size:15.5px}
html[lang="en"] .prod-card h3,html[lang="en"] .xlink a b,html[lang="en"] .gal-tabs button{letter-spacing:0}
html[lang="en"] .more-link a{letter-spacing:0}
html[lang="en"] .about-img .stamp{font-size:13px;letter-spacing:0;padding:10px 14px;max-width:86%;line-height:1.4}
html[lang="en"] .spec-table td:first-child{white-space:normal;width:180px;vertical-align:top}
html[lang="en"] .spec-table td{font-size:13.5px}
html[lang="en"] .q-badges span{letter-spacing:0}
@media (max-width:960px){
  html[lang="en"] .hero h1{font-size:34px}
  html[lang="en"] .page-head h1{font-size:28px}
}
@media (max-width:600px){
  html[lang="en"] .hero h1{font-size:27px}
  html[lang="en"] .page-head h1{font-size:23px}
  html[lang="en"] .sec-head h2{font-size:23px}
}
/* 语言切换按钮（中英页共用） */
nav.menu a.lang{color:var(--red);border:1px solid rgba(192,0,0,.35);border-radius:999px;padding:3px 13px;font-size:13px;line-height:1.5}
nav.menu a.lang::after{display:none}
nav.menu a.lang:hover{background:var(--red);color:#fff;border-color:var(--red)}