/* ============================================================
   Blue Water Industry — Design System
   Deep-sea blue gradient · Industrial · High-end
   ============================================================ */
:root{
  --ink:#051626; --navy:#0a2643; --navy2:#0e3358; --blue:#15639e;
  --steel:#3d8fc7; --sky:#6fb4e0; --line:#e4eaf1; --bg:#f4f7fa;
  --white:#fff; --text:#16242f; --mut:#5d6e7e; --mut2:#8a98a6;
  --accent:#1f9bd6; --accent-d:#0f6e9e; --gold:#c8902f;
  --radius:14px; --radius-s:9px; --shadow:0 14px 40px rgba(8,30,55,.10);
  --shadow-s:0 6px 20px rgba(8,30,55,.08);
  --maxw:1200px;
  --mono:ui-monospace,SFMono-Regular,Menlo,Consolas,monospace;
  --sans:-apple-system,BlinkMacSystemFont,"Segoe UI","Helvetica Neue","PingFang SC","Microsoft YaHei",sans-serif;
}
*{box-sizing:border-box;margin:0;padding:0}
html{scroll-behavior:smooth}
body{font-family:var(--sans);color:var(--text);background:var(--bg);line-height:1.65;
  -webkit-font-smoothing:antialiased;font-size:16px}
a{color:inherit;text-decoration:none}
img{max-width:100%;display:block}
.wrap{max-width:var(--maxw);margin:0 auto;padding:0 24px}
.kicker{font-family:var(--mono);font-size:12.5px;letter-spacing:2px;text-transform:uppercase;
  color:var(--accent);font-weight:600;margin-bottom:14px;display:inline-block}
h1,h2,h3,h4{line-height:1.18;font-weight:700;letter-spacing:-.01em;color:var(--navy)}
h2{font-size:clamp(26px,3.4vw,38px);margin-bottom:14px}
h3{font-size:20px;margin-bottom:8px}
.lead{font-size:17px;color:var(--mut);max-width:640px}
section{padding:84px 0}
.eyebrow{display:inline-flex;align-items:center;gap:8px;font-family:var(--mono);font-size:12px;
  letter-spacing:1.5px;text-transform:uppercase;color:var(--mut);margin-bottom:10px}
.eyebrow::before{content:"";width:22px;height:1.5px;background:var(--accent)}

/* ---------- buttons ---------- */
.btn{display:inline-flex;align-items:center;gap:9px;padding:13px 24px;border-radius:40px;
  font-weight:600;font-size:15px;cursor:pointer;border:1.5px solid transparent;transition:.2s}
.btn-primary{background:linear-gradient(120deg,var(--accent),var(--blue));color:#fff;
  box-shadow:0 8px 22px rgba(31,155,214,.35)}
.btn-primary:hover{transform:translateY(-2px);box-shadow:0 12px 28px rgba(31,155,214,.45)}
.btn-ghost{border-color:rgba(255,255,255,.4);color:#fff}
.btn-ghost:hover{background:rgba(255,255,255,.12)}
.btn-outline{border-color:var(--line);color:var(--navy);background:#fff}
.btn-outline:hover{border-color:var(--accent);color:var(--accent)}

/* ---------- header ---------- */
header.site{position:fixed;top:0;left:0;right:0;z-index:100;transition:.3s}
header.site .bar{display:flex;align-items:center;justify-content:space-between;height:68px}
/* logo layout inspired by efcryo.com: horizontal wordmark on the left, nav on the right, no monogram mark */
header.site .logo{display:flex;align-items:center;flex:0 0 auto;min-width:0}
header.site .logo .brand-mark{display:block;flex:0 0 auto;height:42px;overflow:visible}
header.site .logo .logo-img{height:42px;width:auto;display:block}
header.site nav.main{display:flex;align-items:center;gap:4px}
.nav-item{position:relative}
.nav-item>a{display:flex;align-items:center;gap:6px;padding:10px 15px;color:#dce8f3;font-weight:500;font-size:15px;border-radius:8px;transition:.2s}
.nav-item>a:hover{color:#fff;background:rgba(255,255,255,.08)}
.nav-item>a .caret{font-size:9px;opacity:.7}
/* mega menu */
.mega{position:absolute;top:100%;left:50%;transform:translateX(-50%) translateY(10px);
  background:#fff;border:1px solid var(--line);border-radius:14px;box-shadow:var(--shadow);
  padding:22px;min-width:560px;display:grid;grid-template-columns:1fr 1fr;gap:8px 26px;
  opacity:0;visibility:hidden;transition:.2s;pointer-events:none}
.nav-item:hover .mega{opacity:1;visibility:visible;transform:translateX(-50%) translateY(4px);pointer-events:auto}
.mega a{display:block;padding:9px 12px;border-radius:9px;color:var(--text);font-size:14.5px;transition:.15s}
.mega a:hover{background:var(--bg);color:var(--accent)}
.mega a b{display:block;font-weight:600}
.mega a span{display:block;font-size:12.5px;color:var(--mut)}
.mega .col-title{grid-column:1/-1;font-family:var(--mono);font-size:11.5px;letter-spacing:1.5px;
  text-transform:uppercase;color:var(--mut2);padding:4px 12px 2px}
.header-cta{display:flex;align-items:center;gap:14px}
.header-cta .btn-primary{padding:8px 16px;border-radius:8px;font-size:15px;font-weight:600;line-height:1.2;
  background:transparent;border:1px solid rgba(255,255,255,.5);color:#fff;box-shadow:none}
.header-cta .btn-primary:hover{background:rgba(255,255,255,.14);border-color:#fff;transform:none;box-shadow:none}
.lang-flag{display:inline-flex;align-items:center;justify-content:center;width:38px;height:28px;padding:0;border:0;background:transparent;cursor:pointer;font-family:var(--sans);transition:background .15s}
.lang-flag:hover{background:rgba(255,255,255,.14)}
.lang-flag::before{content:"";width:22px;height:15px;border-radius:2px;background-size:cover;background-position:center;box-shadow:0 0 0 1px rgba(255,255,255,.25)}
.lang-flag[data-lang="en"]::before{background-image:url(../img/flags/us.svg)}
.lang-flag[data-lang="zh"]::before{background-image:url(../img/flags/cn.svg)}
.burger{display:none;flex-direction:column;gap:5px;cursor:pointer;background:none;border:0;padding:8px}
.burger span{width:24px;height:2px;background:#fff;display:block}
/* header solid state (subpages / scrolled) */
header.site.solid{background:rgba(8,26,46,.96);backdrop-filter:blur(10px);box-shadow:0 2px 18px rgba(0,0,0,.18)}
header.site.solid .logo,header.site.solid nav.main .nav-item>a{color:#eaf2f9}
header.site.solid nav.main .nav-item>a:hover{background:rgba(255,255,255,.08)}
header.site.solid .lang-toggle{border-color:rgba(255,255,255,.25)}

/* ---------- hero ---------- */
.hero{position:relative;color:#fff;overflow:hidden;padding:150px 0 90px;
  background:radial-gradient(1200px 600px at 70% -10%,rgba(61,143,199,.35),transparent 60%),
             linear-gradient(135deg,var(--ink) 0%,var(--navy) 46%,var(--navy2) 100%)}
.hero::after{content:"";position:absolute;inset:0;background-image:linear-gradient(rgba(255,255,255,.04) 1px,transparent 1px),
  linear-gradient(90deg,rgba(255,255,255,.04) 1px,transparent 1px);background-size:54px 54px;
  mask-image:radial-gradient(900px 500px at 75% 20%,#000,transparent 75%);opacity:.5}
.hero .wrap{position:relative;z-index:2}
.hero h1{color:#fff;font-size:clamp(34px,5vw,58px);max-width:14ch;margin-bottom:20px}
.hero p.sub{font-size:19px;color:#c6d8ea;max-width:560px;margin-bottom:32px}
.hero .actions{display:flex;gap:14px;flex-wrap:wrap}
.hero-stats{display:flex;gap:38px;margin-top:56px;flex-wrap:wrap}
.hero-stats .st b{display:block;font-size:30px;font-weight:800;color:#fff}
.hero-stats .st span{font-size:13px;color:#9fb8d0;font-family:var(--mono);letter-spacing:.5px}
.hero-media{position:absolute;right:0;bottom:0;width:46%;max-width:620px;opacity:.92;z-index:1;
  mask-image:linear-gradient(90deg,transparent,#000 35%)}
.hero-media img{border-radius:16px 0 0 0;width:100%}

/* ---------- trust / cert strip (frosted glass) ---------- */
.certstrip{position:relative;overflow:hidden;padding:42px 0;
  background:linear-gradient(120deg,var(--navy) 0%,var(--navy2) 55%,var(--blue) 120%)}
.certstrip::before,.certstrip::after{content:"";position:absolute;border-radius:50%;filter:blur(70px);opacity:.55;z-index:0;pointer-events:none}
.certstrip::before{width:420px;height:420px;background:var(--steel);top:-190px;left:-70px}
.certstrip::after{width:480px;height:480px;background:#0c4f7e;bottom:-230px;right:-130px}
.certstrip .wrap{position:relative;z-index:1;display:flex;flex-direction:column;align-items:center;gap:22px}
.certstrip .lab{color:#bcd6ec;font-family:var(--mono);font-size:13px;letter-spacing:2.5px;text-transform:uppercase}
.certlogos{display:flex;gap:16px;width:100%}
.certlogos .cl{flex:1;min-width:0;height:140px;display:flex;align-items:center;justify-content:center;
  background:rgba(255,255,255,.12);backdrop-filter:blur(14px);-webkit-backdrop-filter:blur(14px);
  border:1px solid rgba(255,255,255,.22);border-radius:18px;
  box-shadow:0 10px 32px rgba(5,22,38,.28),inset 0 1px 0 rgba(255,255,255,.28);transition:.25s}
.certlogos .cl:hover{background:rgba(255,255,255,.20);transform:translateY(-4px);border-color:rgba(255,255,255,.45)}
.certlogos .cl img{height:84px;width:auto;max-width:90%;object-fit:contain;display:block;
  filter:brightness(0) invert(1) drop-shadow(0 4px 10px rgba(5,22,38,.35))}

/* ---------- generic section heads ---------- */
.sec-head{margin-bottom:42px;max-width:720px}
.sec-head.center{margin-left:auto;margin-right:auto;text-align:center}
.grid-3{display:grid;grid-template-columns:repeat(3,1fr);gap:24px}
.grid-2{display:grid;grid-template-columns:repeat(2,1fr);gap:24px}
.grid-4{display:grid;grid-template-columns:repeat(4,1fr);gap:20px}

/* ---------- cards ---------- */
.card{background:#fff;border:1px solid var(--line);border-radius:var(--radius);overflow:hidden;transition:.22s;display:flex;flex-direction:column}
.card:hover{box-shadow:var(--shadow);transform:translateY(-3px);border-color:#cfe0ee}
.card .thumb{aspect-ratio:4/3;overflow:hidden;background:var(--bg);position:relative}
.card .thumb img{width:100%;height:100%;object-fit:cover;transition:.4s}
.card:hover .thumb img{transform:scale(1.05)}
.card .body{padding:20px 22px 22px;flex:1;display:flex;flex-direction:column}
.card .body .cat{font-family:var(--mono);font-size:11.5px;letter-spacing:1px;text-transform:uppercase;color:var(--accent);margin-bottom:8px}
.card .body h3{font-size:18px;margin-bottom:8px}
.card .body p{color:var(--mut);font-size:14px;flex:1;margin-bottom:16px}
.card .body .more{color:var(--navy);font-weight:600;font-size:14px;display:inline-flex;gap:6px;align-items:center}
.card .body .more::after{content:"→";transition:.2s}
.card:hover .body .more::after{transform:translateX(4px)}

/* product detail */
.pd-hero{background:linear-gradient(135deg,var(--ink),var(--navy2));color:#fff;padding:130px 0 56px}
.pd-hero .crumbs{font-size:13px;color:#9fb8d0;margin-bottom:14px}
.pd-hero .crumbs a:hover{color:#fff}
.pd-hero h1{color:#fff;font-size:clamp(28px,4vw,42px)}
.pd-hero .tagline{color:#c6d8ea;font-size:17px;margin-top:10px;max-width:620px}
.pd-grid{display:grid;grid-template-columns:1.05fr 1fr;gap:48px;align-items:start}
.pd-media{position:sticky;top:96px}
.pd-media .main{border-radius:var(--radius);overflow:hidden;border:1px solid var(--line);background:#fff}
.pd-media img{width:100%}
.pd-block{margin-bottom:30px}
.pd-block h3{font-size:15px;font-family:var(--mono);letter-spacing:1px;text-transform:uppercase;color:var(--mut);margin-bottom:14px}
.spec-table{width:100%;border-collapse:collapse;font-size:14.5px}
.spec-table tr{border-bottom:1px solid var(--line)}
.spec-table th{text-align:left;color:var(--mut);font-weight:500;padding:11px 0;width:42%}
.spec-table td{text-align:right;font-weight:600;color:var(--navy);padding:11px 0;font-family:var(--mono)}
.cert-badges{display:flex;gap:8px;flex-wrap:wrap}
.cert-badges .b{font-family:var(--mono);font-size:12.5px;font-weight:700;padding:7px 12px;border:1px solid var(--line);border-radius:7px;color:var(--navy)}
.dl-list{display:flex;flex-direction:column;gap:10px}
.dl-list a{display:flex;align-items:center;gap:12px;padding:13px 16px;border:1px solid var(--line);border-radius:10px;
  color:var(--navy);font-weight:600;font-size:14.5px;transition:.18s}
.dl-list a:hover{border-color:var(--accent);background:#f1f8fd}
.dl-list a .ic{width:34px;height:34px;border-radius:8px;background:#eaf3fb;color:var(--accent);display:flex;align-items:center;justify-content:center;font-size:15px}

/* ---------- applications / feature rows ---------- */
.feat-row{display:grid;grid-template-columns:1fr 1fr;gap:48px;align-items:center;margin-bottom:60px}
.feat-row.rev{direction:rtl}
.feat-row.rev>*{direction:ltr}
.feat-row .pic{border-radius:var(--radius);overflow:hidden;box-shadow:var(--shadow-s);aspect-ratio:5/4;background:var(--bg)}
.feat-row .pic img{width:100%;height:100%;object-fit:cover}
.feat-row h3{font-size:24px;margin:10px 0 12px}
.feat-row p{color:var(--mut);margin-bottom:16px}

/* ---------- certification wall ---------- */
.cert-wall{display:grid;grid-template-columns:repeat(5,1fr);gap:18px}
.cert-card{background:#fff;border:1px solid var(--line);border-radius:var(--radius);padding:26px 18px;text-align:center;transition:.2s}
.cert-card:hover{box-shadow:var(--shadow);transform:translateY(-3px)}
.cert-card .logo{height:60px;display:flex;align-items:center;justify-content:center;background:#f4f7fb;border-radius:10px;margin-bottom:14px;padding:10px}
.cert-card .logo img{height:100%;width:auto;max-width:100%;object-fit:contain;display:block}
.cert-card .nm{font-weight:700;font-size:15px;color:var(--navy)}
.cert-card .ds{font-size:13px;color:var(--mut);margin-top:4px}

/* ---------- CTA band ---------- */
.cta-band{background:radial-gradient(900px 400px at 80% 0%,rgba(61,143,199,.4),transparent 60%),
  linear-gradient(135deg,var(--ink),var(--navy2));color:#fff;border-radius:22px;padding:56px 50px;
  display:flex;align-items:center;justify-content:space-between;gap:30px;flex-wrap:wrap}
.cta-band h2{color:#fff}
.cta-band p{color:#c6d8ea;max-width:460px}

/* ---------- footer ---------- */
footer.site{background:var(--ink);color:#bcd0e2;padding:64px 0 30px;margin-top:40px}
footer.site .cols{display:grid;grid-template-columns:1.6fr 1fr 1fr 1fr;gap:36px;margin-bottom:42px}
footer.site h4{color:#fff;font-size:14px;text-transform:uppercase;letter-spacing:1px;margin-bottom:16px;font-family:var(--mono)}
footer.site a{display:block;color:#9fb8d0;padding:6px 0;font-size:14.5px;transition:.15s}
footer.site a:hover{color:#fff}
footer.site .logo{display:flex;align-items:center;gap:11px;color:#fff;font-weight:700;font-size:19px;margin-bottom:14px}
footer.site .logo .logo-img{height:40px;width:auto;display:block;filter:brightness(0) invert(1)}
footer.site .logo .mark{width:34px;height:34px;border-radius:9px;background:linear-gradient(135deg,var(--steel),var(--blue));
  display:flex;align-items:center;justify-content:center;color:#fff;font-weight:800}
footer.site .about{color:#8ba4bd;font-size:14px;max-width:300px;margin-bottom:18px}
footer.site .bottom{border-top:1px solid rgba(255,255,255,.1);padding-top:22px;display:flex;justify-content:space-between;flex-wrap:wrap;gap:12px;font-size:13px;color:#7e96ad}

/* ---------- contact form ---------- */
.form-grid{display:grid;grid-template-columns:1fr 1fr;gap:18px}
.field{display:flex;flex-direction:column;gap:7px}
.field.full{grid-column:1/-1}
.field label{font-size:13.5px;font-weight:600;color:var(--navy)}
.field input,.field select,.field textarea{padding:12px 14px;border:1px solid var(--line);border-radius:10px;font-family:var(--sans);font-size:15px;color:var(--text);background:#fff;transition:.15s}
.field input:focus,.field select:focus,.field textarea:focus{outline:none;border-color:var(--accent);box-shadow:0 0 0 3px rgba(31,155,214,.15)}
.field textarea{resize:vertical;min-height:120px}
.info-card{background:#fff;border:1px solid var(--line);border-radius:var(--radius);padding:26px}
.info-card .row{display:flex;gap:12px;padding:12px 0;border-bottom:1px solid var(--line);font-size:14.5px}
.info-card .row:last-child{border:0}
.info-card .row .ic{color:var(--accent);font-weight:700}
.map-note{margin-top:18px;padding:16px;background:#eaf3fb;border:1px solid #cfe6f7;border-radius:10px;color:var(--navy2);font-size:14px}
.quote{margin:48px auto;max-width:820px;text-align:center;padding:30px 28px;border-top:2px solid var(--accent);border-bottom:2px solid var(--accent)}
.quote p{font-size:21px;line-height:1.55;font-weight:600;color:var(--navy);font-style:italic;margin:0 0 14px}
.quote cite{display:block;font-style:normal;font-size:14px;letter-spacing:.04em;color:var(--mut);font-weight:600}

/* ---------- applications: scenario cards + stock list ---------- */
.scn-card{display:block;background:#fff;border:1px solid var(--line);border-radius:var(--radius);padding:26px;transition:border-color .15s,box-shadow .15s,transform .15s}
.scn-card:hover{border-color:var(--accent);box-shadow:var(--shadow-s);transform:translateY(-3px)}
.scn-card .ico{font-size:30px;line-height:1}
.scn-card h3{margin:14px 0 8px;font-size:19px;color:var(--navy)}
.scn-card p{color:var(--mut);font-size:13.5px;margin:0;line-height:1.5}
.appseg{padding-top:34px}
.stocklist{background:#fff;border:1px solid var(--line);border-radius:var(--radius);padding:6px 24px;margin-top:28px}
.stocklist .sl-head{font-weight:700;color:var(--navy);font-size:13px;letter-spacing:.06em;text-transform:uppercase;padding:16px 0 6px}
.stocklist .sr{display:flex;gap:16px;align-items:baseline;padding:14px 0;border-bottom:1px solid var(--line)}
.stocklist .sr:last-child{border:0}
.stocklist .sr .nm{flex:0 0 190px;font-weight:700;color:var(--navy)}
.stocklist .sr .nm a{color:var(--navy)}
.stocklist .sr .nm a:hover{color:var(--accent)}
.stocklist .sr .ds{color:var(--mut);font-size:14.5px;flex:1}

/* ---------- language switching ---------- */
html:not(.zh) .zh{display:none}
html.zh .en{display:none}
html.zh [lang]{}
.zh-only{display:none}
html.zh .zh-only{display:inline}

/* ---------- responsive ---------- */
@media(max-width:980px){
  .mega{min-width:auto;grid-template-columns:1fr;left:0;transform:none;width:92vw}
  .nav-item:hover .mega{transform:translateY(4px)}
  .pd-grid,.feat-row,.feat-row.rev,.form-grid{grid-template-columns:1fr;gap:28px}
  .feat-row.rev{direction:ltr}
  .pd-media{position:static}
  .stocklist .sr{flex-direction:column;gap:4px}
  .stocklist .sr .nm{flex:auto}
  .grid-3,.grid-4{grid-template-columns:repeat(2,1fr)}
  .cert-wall{grid-template-columns:repeat(3,1fr)}
  .hero-media{display:none}
}
@media(max-width:680px){
  nav.main,.header-cta .btn{display:none}
  .burger{display:flex}
  .grid-2,.grid-3,.grid-4{grid-template-columns:1fr}
  .cert-wall{grid-template-columns:repeat(2,1fr)}
  .certlogos{flex-wrap:wrap;gap:12px}
  .certlogos .cl{flex:1 1 40%;height:110px}
  .certlogos .cl img{height:60px}
  section{padding:60px 0}
  .hero{padding:120px 0 70px}
  .cta-band{padding:38px 26px}
  .mobile-menu{display:none;position:fixed;inset:74px 0 0;background:var(--ink);z-index:99;padding:24px;overflow:auto}
  .mobile-menu.open{display:block}
  .mobile-menu a{display:block;color:#dce8f3;padding:14px 0;border-bottom:1px solid rgba(255,255,255,.1);font-size:17px}
}
@media(min-width:681px){.mobile-menu{display:none!important}}

/* 隐藏产品页下载区块（临时，恢复时删除此行） */
.dl-hidden{display:none}