:root{
  --navy:#052762;
  --navy-deep:#031a42;
  --brand:#21ADBD;
  --brand-light:#6DCECE;
  --ink:#0F1B2D;
  --muted:#5A6B7E;
  --line:#E3EAF0;
  --bg-soft:#F4F8FA;
  --white:#fff;
  --radius:14px;
  --radius-lg:20px;
  --max:1160px;
  --sans:"Inter",-apple-system,BlinkMacSystemFont,"Segoe UI",Roboto,"Helvetica Neue",Arial,"PingFang SC","Microsoft YaHei",sans-serif;
}
*{box-sizing:border-box}
html{scroll-behavior:smooth}
body{
  margin:0;font-family:var(--sans);color:var(--ink);background:var(--white);
  font-size:16px;line-height:1.65;-webkit-font-smoothing:antialiased;
}
img{max-width:100%;display:block}
a{color:inherit;text-decoration:none}
h1,h2,h3,h4{margin:0;line-height:1.25;font-weight:600;letter-spacing:-.01em}
p{margin:0}
ul{margin:0;padding:0;list-style:none}
.wrap{max-width:var(--max);margin:0 auto;padding:0 24px}

/* preview notice */
.preview-note{
  background:var(--navy-deep);color:#BFD4E6;font-size:12.5px;text-align:center;
  padding:7px 16px;letter-spacing:.01em;
}
.preview-note b{color:var(--brand-light);font-weight:600}

/* header */
.site-header{
  position:sticky;top:0;z-index:50;background:rgba(255,255,255,.94);
  backdrop-filter:saturate(180%) blur(10px);border-bottom:1px solid var(--line);
}
.header-inner{display:flex;align-items:center;gap:28px;height:72px}
.logo{display:flex;align-items:center;gap:11px;flex-shrink:0}
.logo img{width:40px;height:40px;border-radius:11px}
.logo img.logo-plate{width:auto;height:40px;border-radius:8px}
.logo-text{display:flex;flex-direction:column;justify-content:center;line-height:1.15}
.logo-text strong{font-size:19px;font-weight:700;color:var(--navy);letter-spacing:.01em}
.logo-text span{font-size:10.5px;color:var(--muted);letter-spacing:.14em;text-transform:uppercase}
.main-nav{display:flex;gap:26px;margin-left:auto;font-size:14.5px;font-weight:500}
.main-nav a{color:#2A3B4D;padding:4px 0;border-bottom:2px solid transparent;transition:.15s}
.main-nav a:hover{color:var(--brand);border-color:var(--brand)}
.header-actions{display:flex;align-items:center;gap:14px;margin-left:auto}
.lang-switch{display:flex;align-items:center;gap:6px;font-size:13.5px;color:var(--muted)}
.lang-switch a{padding:3px 8px;border-radius:6px}
.lang-switch a.active{background:var(--bg-soft);color:var(--navy);font-weight:600}
.btn{
  display:inline-flex;align-items:center;justify-content:center;gap:8px;
  padding:11px 20px;border-radius:10px;font-size:14.5px;font-weight:600;
  border:1px solid transparent;cursor:pointer;transition:.18s;white-space:nowrap;
}
.btn-primary{background:var(--navy);color:#fff}
.btn-primary:hover{background:#0A3D8F;transform:translateY(-1px)}
.btn-brand{background:var(--brand);color:#04283a}
.btn-brand:hover{background:var(--brand-light)}
.btn-ghost{background:transparent;color:#fff;border-color:rgba(255,255,255,.45)}
.btn-ghost:hover{background:rgba(255,255,255,.12)}
.btn-outline{background:#fff;color:var(--navy);border-color:#C9D8E4}
.btn-outline:hover{border-color:var(--brand);color:var(--brand)}

/* hero */
.hero{position:relative;color:#fff;overflow:hidden;background:var(--navy)}
.hero-bg{position:absolute;inset:0;width:100%;height:100%;object-fit:cover;opacity:.42}
.hero::after{
  content:"";position:absolute;inset:0;
  background:linear-gradient(100deg,#031a42 8%,rgba(5,39,98,.86) 44%,rgba(33,173,189,.28) 100%);
}
.hero-inner{position:relative;z-index:2;padding:92px 0 84px;max-width:720px}
.eyebrow{
  display:inline-flex;align-items:center;gap:8px;font-size:12.5px;letter-spacing:.16em;
  text-transform:uppercase;color:var(--brand-light);font-weight:600;margin-bottom:20px;
}
.eyebrow::before{content:"";width:26px;height:1px;background:var(--brand-light)}
.hero h1{font-size:clamp(34px,4.4vw,52px);font-weight:700;letter-spacing:-.02em}
.hero h1 em{font-style:normal;color:var(--brand-light)}
.hero-sub{margin-top:22px;font-size:17.5px;line-height:1.7;color:#D3E3EE;max-width:600px}
.hero-cta{display:flex;flex-wrap:wrap;gap:14px;margin-top:34px}
.trust-chips{display:flex;flex-wrap:wrap;gap:10px;margin-top:38px}
.chip{
  display:inline-flex;align-items:center;gap:7px;font-size:13px;color:#E4F1F5;
  background:rgba(255,255,255,.1);border:1px solid rgba(255,255,255,.2);
  padding:7px 13px;border-radius:999px;
}
.chip i{width:6px;height:6px;border-radius:50%;background:var(--brand-light);display:block}

/* stats */
.stats{background:var(--bg-soft);border-bottom:1px solid var(--line)}
.stats-grid{display:grid;grid-template-columns:repeat(4,1fr);gap:2px}
.stat{padding:30px 8px;text-align:center}
.stat b{display:block;font-size:23px;color:var(--navy);font-weight:700;letter-spacing:-.01em}
.stat span{font-size:13px;color:var(--muted)}

/* sections */
.section{padding:78px 0}
.section.soft{background:var(--bg-soft)}
.section-head{max-width:660px;margin-bottom:46px}
.section-head.center{margin-left:auto;margin-right:auto;text-align:center}
.section-head h2{font-size:clamp(26px,3vw,34px);color:var(--navy)}
.section-head p{margin-top:14px;color:var(--muted);font-size:16px}
.section-head .kicker{
  font-size:12.5px;letter-spacing:.16em;text-transform:uppercase;color:var(--brand);
  font-weight:600;margin-bottom:12px;
}

/* categories */
.cat-grid{display:grid;grid-template-columns:repeat(3,1fr);gap:26px}
.cat-card{
  background:#fff;border:1px solid var(--line);border-radius:var(--radius-lg);
  overflow:hidden;transition:.2s;display:flex;flex-direction:column;
}
.cat-card:hover{transform:translateY(-4px);box-shadow:0 16px 36px rgba(5,39,98,.1);border-color:#CFE0E8}
.cat-card figure{margin:0;aspect-ratio:4/3;overflow:hidden;background:var(--bg-soft)}
.cat-card figure img{width:100%;height:100%;object-fit:cover;transition:.4s}
.cat-card:hover figure img{transform:scale(1.04)}
.cat-body{padding:24px 24px 26px;display:flex;flex-direction:column;gap:10px;flex:1}
.cat-body h3{font-size:19px;color:var(--navy)}
.cat-body p{color:var(--muted);font-size:14.5px}
.cat-link{margin-top:auto;font-size:14px;font-weight:600;color:var(--brand)}
.cat-link::after{content:" →"}

/* features */
.feat-grid{display:grid;grid-template-columns:repeat(3,1fr);gap:22px}
.feat-card{background:#fff;border:1px solid var(--line);border-radius:var(--radius);padding:26px 24px}
.feat-icon{
  width:40px;height:40px;border-radius:11px;background:linear-gradient(135deg,#052762,#21ADBD);
  display:flex;align-items:center;justify-content:center;margin-bottom:16px;
}
.feat-icon svg{width:20px;height:20px;stroke:#fff;fill:none;stroke-width:1.7;stroke-linecap:round;stroke-linejoin:round}
.feat-card h4{font-size:16.5px;color:var(--navy);margin-bottom:8px}
.feat-card p{font-size:14.5px;color:var(--muted)}

/* capability split */
.split{display:grid;grid-template-columns:1.05fr .95fr;gap:56px;align-items:center}
.split figure{margin:0;border-radius:var(--radius-lg);overflow:hidden;border:1px solid var(--line)}
.split figure img{width:100%;aspect-ratio:4/3;object-fit:cover}
.check-list{margin-top:26px;display:grid;gap:14px}
.check-list li{display:flex;gap:12px;font-size:15px;color:#2A3B4D}
.check-list .tick{
  flex-shrink:0;width:20px;height:20px;border-radius:50%;background:rgba(33,173,189,.14);
  display:flex;align-items:center;justify-content:center;margin-top:2px;
}
.check-list .tick svg{width:12px;height:12px;stroke:#0E8C9B;fill:none;stroke-width:2.4;stroke-linecap:round;stroke-linejoin:round}

/* quote band */
.quote-band{background:var(--navy);color:#fff;position:relative;overflow:hidden}
.quote-band::before{
  content:"";position:absolute;right:-160px;top:-160px;width:520px;height:520px;border-radius:50%;
  background:radial-gradient(circle,rgba(33,173,189,.32),rgba(33,173,189,0) 70%);
}
.quote-inner{position:relative;z-index:2;display:grid;grid-template-columns:.95fr 1.05fr;gap:56px;padding:78px 0}
.quote-copy h2{font-size:clamp(26px,3vw,34px)}
.quote-copy p{margin-top:16px;color:#C9DBE7;font-size:16px}
.quote-points{margin-top:28px;display:grid;gap:12px}
.quote-points li{display:flex;gap:11px;font-size:14.5px;color:#D8E7F0}
.quote-points i{width:6px;height:6px;border-radius:50%;background:var(--brand-light);display:block;margin-top:9px;flex-shrink:0}
.form-card{background:#fff;border-radius:var(--radius-lg);padding:30px;color:var(--ink)}
.form-card h3{font-size:19px;color:var(--navy);margin-bottom:6px}
.form-card .form-hint{font-size:13px;color:var(--muted);margin-bottom:20px}
.form-grid{display:grid;grid-template-columns:1fr 1fr;gap:14px}
.field{display:flex;flex-direction:column;gap:6px}
.field.full{grid-column:1/-1}
.field label{font-size:13px;font-weight:500;color:#33475C}
.field input,.field select,.field textarea{
  font-family:var(--sans);font-size:14.5px;color:var(--ink);
  padding:11px 13px;border:1px solid #D8E2EA;border-radius:9px;background:#FBFDFE;
  transition:.15s;width:100%;
}
.field textarea{resize:vertical;min-height:96px}
.field input:focus,.field select:focus,.field textarea:focus{
  outline:none;border-color:var(--brand);background:#fff;box-shadow:0 0 0 3px rgba(33,173,189,.13)
}
.form-card .btn{width:100%;margin-top:18px}
.form-note{margin-top:14px;font-size:12.5px;color:var(--muted);text-align:center}
.hp{position:absolute;left:-9999px;opacity:0}
.form-success{
  display:none;background:#E7F7F4;border:1px solid #A9DFD6;color:#0B6B63;
  padding:14px 16px;border-radius:10px;font-size:14px;margin-top:16px;
}
.form-success.show{display:block}

/* faq */
.faq-list{display:grid;gap:12px;max-width:860px;margin:0 auto}
.faq-list details{
  background:#fff;border:1px solid var(--line);border-radius:var(--radius);
  padding:18px 22px;transition:.15s;
}
.faq-list details[open]{border-color:#CFE0E8;box-shadow:0 8px 22px rgba(5,39,98,.05)}
.faq-list summary{
  cursor:pointer;font-size:16px;font-weight:600;color:var(--navy);list-style:none;
  display:flex;justify-content:space-between;gap:16px;align-items:center;
}
.faq-list summary::-webkit-details-marker{display:none}
.faq-list summary::after{content:"+";color:var(--brand);font-size:20px;font-weight:400;line-height:1}
.faq-list details[open] summary::after{content:"–"}
.faq-list p{margin-top:12px;color:var(--muted);font-size:14.5px}

/* footer */
.site-footer{background:var(--navy-deep);color:#A9C2D6;font-size:14px;padding:60px 0 28px}
.footer-grid{display:grid;grid-template-columns:1.4fr 1fr 1fr 1fr;gap:36px}
.footer-brand{display:flex;align-items:center;gap:11px;margin-bottom:18px}
.footer-brand img{width:38px;height:38px;border-radius:10px}
.footer-brand strong{color:#fff;font-size:17px;display:block;line-height:1.2}
.footer-brand span{font-size:12px;color:#7E9AB4}
.site-footer h4{color:#fff;font-size:14px;margin-bottom:16px;letter-spacing:.02em}
.site-footer li{margin-bottom:10px}
.site-footer a:hover{color:var(--brand-light)}
.footer-bottom{
  margin-top:44px;padding-top:22px;border-top:1px solid rgba(255,255,255,.12);
  display:flex;justify-content:space-between;gap:20px;flex-wrap:wrap;font-size:12.5px;color:#7E9AB4;
}

/* floating whatsapp */
.float-cta{
  position:fixed;right:22px;bottom:22px;z-index:60;
  display:flex;align-items:center;gap:9px;padding:13px 20px;border-radius:999px;
  background:var(--brand);color:#04283a;font-weight:600;font-size:14px;
  box-shadow:0 12px 28px rgba(33,173,189,.36);
}
.float-cta svg{width:18px;height:18px;fill:#04283a}
.float-cta:hover{background:var(--brand-light)}

/* utility + inner page */
.kicker{font-size:12.5px;letter-spacing:.16em;text-transform:uppercase;color:var(--brand);font-weight:600;margin-bottom:12px}
.section-title{font-size:clamp(26px,3vw,34px);color:var(--navy)}
.mt-30{margin-top:30px}
.mt-14{margin-top:14px}
.page-hero{background:var(--navy);color:#fff;padding:56px 0 52px;position:relative;overflow:hidden}
.page-hero::before{content:"";position:absolute;right:-120px;top:-120px;width:420px;height:420px;border-radius:50%;background:radial-gradient(circle,rgba(33,173,189,.3),rgba(33,173,189,0) 70%)}
.page-hero .wrap{position:relative;z-index:2}
.page-hero h1{font-size:clamp(28px,3.4vw,40px);font-weight:700}
.page-hero p{margin-top:14px;color:#C9DBE7;max-width:680px;font-size:16.5px}
.breadcrumb{margin-top:20px;font-size:13px;color:#8FB0C7;display:flex;gap:8px;flex-wrap:wrap}
.breadcrumb a:hover{color:var(--brand-light)}
.breadcrumb span{color:#5E7C96}
.prose{max-width:820px;font-size:15.5px;color:#33475C}
.prose h2{font-size:22px;color:var(--navy);margin:34px 0 12px}
.prose h3{font-size:17px;color:var(--navy);margin:24px 0 10px}
.prose p{margin-bottom:14px}
.prose ul{list-style:disc;padding-left:22px;margin-bottom:16px}
.prose li{margin-bottom:8px}
.prose .updated{font-size:13px;color:var(--muted);margin-bottom:26px}
.spec-table{width:100%;border-collapse:collapse;font-size:14.5px;margin-top:8px}
.spec-table th,.spec-table td{text-align:left;padding:12px 14px;border-bottom:1px solid var(--line)}
.spec-table th{width:38%;color:#33475C;font-weight:500;background:#FAFCFD}
.spec-table td{color:var(--ink)}
.product-hero{display:grid;grid-template-columns:1.02fr .98fr;gap:48px;align-items:start;padding:64px 0}
.gallery{border:1px solid var(--line);border-radius:var(--radius-lg);overflow:hidden;background:var(--bg-soft)}
.gallery img{width:100%;aspect-ratio:1/1;object-fit:cover}
.gallery-thumbs{display:grid;grid-template-columns:repeat(4,1fr);gap:10px;margin-top:12px}
.gallery-thumbs div{aspect-ratio:1/1;border-radius:9px;background:var(--bg-soft);border:1px solid var(--line);display:flex;align-items:center;justify-content:center;font-size:11px;color:var(--muted);text-align:center}
.prod-info h1{font-size:clamp(26px,3vw,34px);color:var(--navy)}
.prod-tagline{margin-top:12px;color:var(--muted);font-size:16px}
.prod-meta{margin-top:20px;display:flex;flex-wrap:wrap;gap:8px}
.prod-meta span{font-size:12.5px;background:var(--bg-soft);border:1px solid var(--line);border-radius:999px;padding:6px 12px;color:#33475C}
.prod-price{margin-top:24px;padding:16px 18px;border-radius:var(--radius);background:var(--bg-soft);border:1px solid var(--line)}
.prod-price b{color:var(--navy);font-size:16px}
.prod-price p{font-size:13.5px;color:var(--muted);margin-top:4px}
.btn-row{display:flex;flex-wrap:wrap;gap:12px;margin-top:26px}
.grid-3{display:grid;grid-template-columns:repeat(3,1fr);gap:26px}
.grid-2{display:grid;grid-template-columns:1fr 1fr;gap:32px}
.cta-strip{background:var(--navy);color:#fff;text-align:center;padding:56px 0}
.cta-strip h2{font-size:clamp(24px,2.8vw,30px)}
.cta-strip p{margin:14px auto 26px;color:#C9DBE7;max-width:600px;font-size:15.5px}
.notfound{text-align:center;padding:110px 0}
.notfound b{font-size:78px;color:var(--brand);display:block;line-height:1;font-weight:700}
.notfound h1{margin-top:18px;font-size:26px;color:var(--navy)}
.notfound p{margin-top:14px;color:var(--muted)}
.anchor-pad{scroll-margin-top:90px}
@media (max-width:960px){
  .product-hero{grid-template-columns:1fr;gap:30px;padding:44px 0}
  .grid-3{grid-template-columns:1fr 1fr}
  .grid-2{grid-template-columns:1fr}
}
@media (max-width:640px){
  .grid-3{grid-template-columns:1fr}
  .page-hero{padding:42px 0 38px}
}
@media (max-width:960px){
  .main-nav{display:none}
  .header-inner{height:64px;gap:14px}
  .split,.quote-inner{grid-template-columns:1fr;gap:34px}
  .cat-grid,.feat-grid{grid-template-columns:1fr 1fr}
  .stats-grid{grid-template-columns:1fr 1fr}
  .footer-grid{grid-template-columns:1fr 1fr}
  .hero-inner{padding:66px 0 60px}
}
@media (max-width:640px){
  .wrap{padding:0 18px}
  .section{padding:56px 0}
  .cat-grid,.feat-grid,.form-grid,.footer-grid{grid-template-columns:1fr}
  .stat{padding:22px 6px}
  .form-card{padding:22px}
  .lang-switch a{padding:3px 6px}
  .logo-text span{display:none}
  .float-cta span{display:none}
  .float-cta{padding:15px;border-radius:50%}
}

/* ===== 定位板块（视频位 + 图文） ===== */
.block-section{padding:56px 0;border-bottom:1px solid #E4ECF2}
.block-section.alt{background:var(--bg-soft)}
.block-head{max-width:820px;margin:0 auto 28px;text-align:center}
.block-head h2{font-size:30px;margin:8px 0 14px;color:var(--navy)}
.block-head p{color:#33475C;font-size:16px;line-height:1.7}
.video-frame{position:relative;width:100%;max-width:900px;margin:0 auto 30px;aspect-ratio:16/9;background:#0B1F33;border-radius:14px;overflow:hidden;box-shadow:0 14px 40px rgba(11,31,51,.18)}
.video-frame iframe,.video-frame video{position:absolute;inset:0;width:100%;height:100%;border:0}
.video-ph img{position:absolute;inset:0;width:100%;height:100%;object-fit:cover;filter:saturate(.85) brightness(.72)}
.video-ph-overlay{position:absolute;inset:0;display:flex;flex-direction:column;align-items:center;justify-content:center;gap:8px;color:#fff;text-align:center;padding:20px;background:rgba(11,31,51,.28)}
.video-ph-overlay b{font-size:17px}
.video-ph-overlay small{opacity:.85;max-width:520px;line-height:1.6}
.play-btn{width:62px;height:62px;border-radius:50%;background:var(--brand);display:flex;align-items:center;justify-content:center;box-shadow:0 8px 24px rgba(0,199,140,.45)}
.play-btn svg{width:26px;height:26px;fill:#fff;margin-left:3px}
.block-body{max-width:900px;margin:0 auto;display:grid;grid-template-columns:.9fr 1.1fr;gap:32px;align-items:center}
.block-section.alt .block-body{grid-template-columns:1.1fr .9fr}
.block-section.alt .block-media{order:2}
.block-media{margin:0;border-radius:14px;overflow:hidden;box-shadow:0 10px 30px rgba(11,31,51,.12)}
.block-media img{width:100%;height:100%;object-fit:cover;display:block;aspect-ratio:4/3}
.block-body .check-list{margin:0}
.center{text-align:center}
@media (max-width:860px){.block-body,.block-section.alt .block-body{grid-template-columns:1fr}.block-section.alt .block-media{order:0}.block-head h2{font-size:24px}}