/* Gaoxiang Water Meter — watermetermaker.com | 工业目录风 (steel navy + safety orange) */
:root{
  --ink:#0B2A4A; --steel:#14497B; --accent:#C2510C; --accent-deep:#A84409;
  --paper:#FFFFFF; --wash:#F3F6F9; --line:#D8E0E8;
  --text:#1C2B3A; --muted:#5C6F82;
  --radius:6px;
  --ease:cubic-bezier(.22,.61,.21,1);
  --font:-apple-system,BlinkMacSystemFont,"Segoe UI","Helvetica Neue",Arial,"Noto Sans",sans-serif;
}
*{box-sizing:border-box}
html{scroll-behavior:smooth}
body{margin:0;font-family:var(--font);color:var(--text);font-size:16px;line-height:1.7;background:var(--paper);-webkit-font-smoothing:antialiased}
img{max-width:100%;height:auto;display:block}
.mtr-hero .wrap>*,.mtr-selgrid>*,.mtr-cols>*,.mtr-dirgrid>*,.mtr-postgrid>*,.mtr-factgrid>*,.mtr-footgrid>*,.mtr-formrow>*{min-width:0}
a{color:var(--steel)}
h1,h2,h3{line-height:1.25;color:var(--ink);margin:0 0 .6em}
h1{font-size:clamp(30px,4vw,42px);font-weight:800;letter-spacing:-.01em}
h2{font-size:clamp(22px,2.6vw,28px);font-weight:750}
h3{font-size:19px;font-weight:700}
p{margin:0 0 1em}
.wrap{max-width:1200px;margin:0 auto;padding:0 24px}
.num{font-variant-numeric:tabular-nums}

/* ---------- header ---------- */
.mtr-topbar{background:var(--ink);color:#C9D6E4;font-size:13px}
.mtr-topbar .wrap{display:flex;justify-content:space-between;align-items:center;padding-top:9px;padding-bottom:9px}
.mtr-topbar a{color:#E7EEF6;text-decoration:none}
.mtr-topbar a:hover{text-decoration:underline}
.mtr-header{background:#fff;border-bottom:1px solid var(--line);position:sticky;top:0;z-index:50}
.mtr-header .wrap{display:flex;align-items:center;gap:28px;height:72px}
.mtr-brand{display:flex;align-items:center;gap:12px;text-decoration:none;color:var(--ink);font-weight:800;font-size:19px;white-space:nowrap}
.mtr-brand .mtr-mark{width:36px;height:36px;border-radius:8px;background:linear-gradient(135deg,var(--steel),var(--ink));color:#fff;display:grid;place-items:center;font-weight:800;font-size:18px}
.mtr-brand small{display:block;font-size:11px;font-weight:600;color:var(--muted);letter-spacing:.06em}
.mtr-nav{display:flex;gap:4px;margin-left:auto}
.mtr-nav>a,.mtr-nav .mtr-dropbtn{padding:10px 14px;text-decoration:none;color:var(--text);font-weight:600;font-size:15px;border-radius:6px;background:none;border:0;cursor:pointer;font-family:inherit}
.mtr-nav>a:hover,.mtr-nav .mtr-dropbtn:hover{background:var(--wash);color:var(--ink)}
.mtr-nav>a.active{color:var(--steel)}
.mtr-drop{position:relative}
.mtr-dropmenu{position:absolute;top:100%;left:0;min-width:270px;background:#fff;border:1px solid var(--line);border-radius:8px;box-shadow:0 18px 40px rgba(11,42,74,.14);padding:8px;display:none}
.mtr-drop:hover .mtr-dropmenu,.mtr-drop:focus-within .mtr-dropmenu{display:block}
.mtr-dropmenu a{display:block;padding:9px 12px;border-radius:6px;color:var(--text);text-decoration:none;font-size:14px;font-weight:500}
.mtr-dropmenu a:hover{background:var(--wash);color:var(--ink)}
.mtr-navcta{margin-left:8px}
.btn{display:inline-block;background:var(--accent);color:#fff!important;text-decoration:none;font-weight:700;padding:12px 26px;border-radius:var(--radius);border:0;cursor:pointer;font-size:16px;transition:transform .18s var(--ease),background .18s var(--ease)}
.btn:hover{background:var(--accent-deep)}
.btn:active{transform:scale(.97)}
.btn-ghost{background:#fff;color:var(--ink)!important;border:1.5px solid var(--line)}
.btn-ghost:hover{border-color:var(--steel)}
.mtr-burger{display:none;background:none;border:0;cursor:pointer;padding:10px;margin-left:auto}
.mtr-burger span{display:block;width:24px;height:2.5px;background:var(--ink);margin:5px 0;border-radius:2px}

/* ---------- hero ---------- */
.mtr-hero{background:radial-gradient(1100px 480px at 75% -10%,#1B4E86 0%,var(--ink) 55%) ;color:#fff;position:relative;overflow:hidden}
.mtr-hero::after{content:"";position:absolute;inset:0;background-image:linear-gradient(rgba(255,255,255,.045) 1px,transparent 1px),linear-gradient(90deg,rgba(255,255,255,.045) 1px,transparent 1px);background-size:44px 44px;pointer-events:none}
.mtr-hero .wrap{position:relative;z-index:1;display:grid;grid-template-columns:1.15fr .85fr;gap:48px;align-items:center;padding-top:64px;padding-bottom:64px}
.mtr-hero h1{color:#fff}
.mtr-hero p.lead{color:#C9D6E4;font-size:18px;max-width:34em}
.mtr-hero .mtr-ctas{display:flex;gap:14px;flex-wrap:wrap;margin-top:22px}
.mtr-hero figure{margin:0}
.mtr-hero img{border-radius:10px;box-shadow:0 24px 60px rgba(0,0,0,.35)}
.mtr-kicker{display:inline-block;font-size:12.5px;font-weight:700;letter-spacing:.14em;color:#FFB27A;margin-bottom:12px}
.mtr-crumbs{font-size:13px;color:var(--muted);margin:18px 0 0}
.mtr-crumbs a{color:var(--steel);text-decoration:none}

/* ---------- selector (signature) ---------- */
.mtr-selector{background:var(--wash);border-top:1px solid var(--line);border-bottom:1px solid var(--line)}
.mtr-selector .wrap{padding-top:56px;padding-bottom:56px}
.mtr-selgrid{display:grid;grid-template-columns:1fr 1fr;gap:32px;margin-top:28px;align-items:start}
.mtr-selcard{background:#fff;border:1px solid var(--line);border-radius:10px;padding:28px}
.mtr-selcard fieldset{border:0;padding:0;margin:0 0 20px}
.mtr-selcard legend{font-weight:700;color:var(--ink);margin-bottom:10px;font-size:15px}
.mtr-opts{display:grid;grid-template-columns:repeat(auto-fit,minmax(150px,1fr));gap:10px}
.mtr-opt{position:relative}
.mtr-opt input{position:absolute;opacity:0;inset:0}
.mtr-opt label{display:block;border:1.5px solid var(--line);border-radius:8px;padding:11px 12px;font-size:14px;font-weight:600;cursor:pointer;transition:border-color .15s var(--ease),background .15s var(--ease);text-align:center}
.mtr-opt label small{display:block;font-weight:400;color:var(--muted);font-size:12px}
.mtr-opt input:checked+label{border-color:var(--accent);background:#FFF4EC;box-shadow:0 0 0 1px var(--accent)}
.mtr-opt input:focus-visible+label{outline:2px solid var(--steel);outline-offset:2px}
.mtr-result{background:var(--ink);color:#fff;border-radius:10px;padding:28px;min-height:340px}
.mtr-result h3{color:#fff;margin-top:0}
.mtr-result .mtr-res-empty{color:#9FB3C8}
.mtr-res-item{background:rgba(255,255,255,.07);border:1px solid rgba(255,255,255,.16);border-radius:8px;padding:16px;margin:12px 0}
.mtr-res-item strong{color:#FFB27A}
.mtr-res-item a{color:#fff;font-weight:700}
.mtr-res-why{font-size:14px;color:#C9D6E4;margin:6px 0 10px}
.mtr-note{font-size:13px;color:#9FB3C8;margin-top:14px}

/* ---------- directory ---------- */
.mtr-dir .wrap{padding-top:56px;padding-bottom:56px}
.mtr-dirgrid{display:grid;grid-template-columns:repeat(3,1fr);gap:20px;margin-top:28px}
.mtr-dircard{background:#fff;border:1px solid var(--line);border-radius:10px;overflow:hidden;display:flex;flex-direction:column;transition:transform .2s var(--ease),box-shadow .2s var(--ease);border-top:3px solid var(--accent)}
.mtr-dircard:hover{box-shadow:0 16px 34px rgba(11,42,74,.12)}
.mtr-dircard img{aspect-ratio:4/3;object-fit:cover;width:100%}
.mtr-dircard .mtr-dircard-body{padding:18px 20px 22px;display:flex;flex-direction:column;gap:8px;flex:1}
.mtr-dircard h3{margin:0;font-size:18px}
.mtr-dircard h3 a{color:var(--ink);text-decoration:none}
.mtr-dircard h3 a:hover{color:var(--steel)}
.mtr-dircard p{font-size:14px;color:var(--muted);margin:0;flex:1}
.mtr-dircard .mtr-more{font-size:14px;font-weight:700;color:var(--accent);text-decoration:none}

/* ---------- fact strip ---------- */
.mtr-facts{background:var(--ink);color:#fff}
.mtr-facts .wrap{padding-top:48px;padding-bottom:48px}
.mtr-facts h2{color:#fff}
.mtr-factgrid{display:grid;grid-template-columns:repeat(5,1fr);gap:20px;margin-top:8px}
.mtr-fact{border-left:3px solid var(--accent);padding-left:16px}
.mtr-fact .mtr-factnum{font-size:30px;font-weight:800;color:#FFB27A}
.mtr-fact .mtr-factlbl{font-size:13.5px;color:#C9D6E4}

/* ---------- CTA ---------- */
.mtr-cta{background:var(--wash)}
.mtr-cta .wrap{padding-top:56px;padding-bottom:64px;text-align:center}
.mtr-cta p{color:var(--muted);max-width:40em;margin:0 auto 22px}
.mtr-cta .mtr-mail{display:block;margin-top:14px;font-size:14px}

/* ---------- content pages ---------- */
.mtr-pagehead{background:var(--wash);border-bottom:1px solid var(--line)}
.mtr-pagehead .wrap{padding-top:40px;padding-bottom:36px}
.mtr-pagehead p.lead{color:var(--muted);font-size:17px;max-width:44em}
.mtr-cols{display:grid;grid-template-columns:7fr 5fr;gap:44px;align-items:start}
.mtr-cols .wrap,.mtr-body .wrap{padding-top:40px;padding-bottom:56px}
.mtr-prose ul{padding-left:22px}
.mtr-prose li{margin-bottom:.5em}
.mtr-prose table{width:100%;border-collapse:collapse;margin:1.2em 0;font-size:15px}
.mtr-prose th{background:var(--ink);color:#fff;text-align:left;padding:10px 14px;font-weight:700}
.mtr-prose td{border:1px solid var(--line);padding:10px 14px}
.mtr-side{position:sticky;top:96px;display:flex;flex-direction:column;gap:18px}
.mtr-sidecard{background:var(--wash);border:1px solid var(--line);border-radius:10px;padding:22px}
.mtr-sidecard h3{font-size:16px;margin-top:0}
.mtr-sidecard ul{margin:0;padding-left:18px;font-size:14px}
.mtr-specnote{background:#FFF7EF;border:1px solid #F3C89B;border-left:4px solid var(--accent);border-radius:8px;padding:16px 18px;font-size:14.5px;margin:1.6em 0}
.mtr-specnote strong{color:var(--ink)}
.mtr-anchor-sec{scroll-margin-top:96px;border-top:1px solid var(--line);padding-top:28px;margin-top:28px}
.mtr-fig{margin:0 0 1.6em}
.mtr-fig img{border-radius:10px;border:1px solid var(--line)}
.mtr-fig figcaption{font-size:13px;color:var(--muted);margin-top:8px}

/* ---------- blog ---------- */
.mtr-postgrid{display:grid;grid-template-columns:repeat(3,1fr);gap:20px;margin-top:28px}
.mtr-postcard{background:#fff;border:1px solid var(--line);border-radius:10px;overflow:hidden;display:flex;flex-direction:column;transition:transform .2s var(--ease),box-shadow .2s var(--ease)}
.mtr-postcard:hover{box-shadow:0 16px 34px rgba(11,42,74,.12)}
.mtr-postcard img{aspect-ratio:16/10;object-fit:cover;width:100%}
.mtr-postcard .mtr-postcard-body{padding:18px 20px 22px}
.mtr-postcard h3{font-size:17px;margin:0 0 8px}
.mtr-postcard h3 a{color:var(--ink);text-decoration:none}
.mtr-toc{background:var(--wash);border:1px solid var(--line);border-radius:10px;padding:20px 22px;font-size:14px}
.mtr-toc h3{font-size:15px;margin-top:0}
.mtr-toc ol{margin:0;padding-left:20px}
.mtr-toc a{color:var(--steel);text-decoration:none}
.mtr-faq{margin-top:2em}
.mtr-faq details{border:1px solid var(--line);border-radius:8px;margin-bottom:10px;background:#fff}
.mtr-faq summary{cursor:pointer;font-weight:700;padding:14px 18px;color:var(--ink)}
.mtr-faq details div{padding:0 18px 16px;font-size:15px;color:var(--text)}

/* ---------- forms ---------- */
.mtr-form{background:#fff;border:1px solid var(--line);border-radius:10px;padding:28px}
.mtr-form label{display:block;font-weight:600;font-size:14px;margin-bottom:14px;color:var(--ink)}
.mtr-form input[type=text],.mtr-form input[type=email],.mtr-form select,.mtr-form textarea{width:100%;margin-top:6px;padding:11px 13px;border:1.5px solid var(--line);border-radius:6px;font-size:15px;font-family:inherit;color:var(--text);background:#fff}
.mtr-form input:focus,.mtr-form select:focus,.mtr-form textarea:focus{outline:none;border-color:var(--steel);box-shadow:0 0 0 3px rgba(20,73,123,.15)}
.mtr-form textarea{min-height:130px;resize:vertical}
.mtr-honeypot{position:absolute;left:-9999px;top:auto;width:1px;height:1px;overflow:hidden}
.mtr-formrow{display:grid;grid-template-columns:1fr 1fr;gap:14px}

/* ---------- footer ---------- */
.mtr-footer{background:var(--ink);color:#C9D6E4;margin-top:0}
.mtr-footer .wrap{padding-top:52px;padding-bottom:28px}
.mtr-footgrid{display:grid;grid-template-columns:1.3fr 1fr 1fr 1.2fr;gap:36px}
.mtr-footer h3{color:#fff;font-size:15px;letter-spacing:.04em}
.mtr-footer a{color:#C9D6E4;text-decoration:none;font-size:14px}
.mtr-footer a:hover{color:#fff;text-decoration:underline}
.mtr-footer ul{list-style:none;margin:0;padding:0}
.mtr-footer li{margin-bottom:8px}
.mtr-footbrand p{font-size:14px}
.mtr-footbottom{border-top:1px solid rgba(255,255,255,.14);margin-top:36px;padding-top:20px;font-size:13px;color:#8FA6BC;display:flex;justify-content:space-between;flex-wrap:wrap;gap:8px}

/* ---------- reveal ---------- */
html.js .mtr-reveal{opacity:0;transform:translateY(18px);transition:opacity .5s var(--ease),transform .5s var(--ease)}
html.js .mtr-reveal.is-visible{opacity:1;transform:none}

/* ---------- responsive ---------- */
@media (max-width:1024px){
  .mtr-hero .wrap{grid-template-columns:1fr;gap:32px}
  .mtr-selgrid{grid-template-columns:1fr}
  .mtr-dirgrid{grid-template-columns:repeat(2,1fr)}
  .mtr-postgrid{grid-template-columns:repeat(2,1fr)}
  .mtr-factgrid{grid-template-columns:repeat(3,1fr);row-gap:28px}
  .mtr-cols{grid-template-columns:1fr}
  .mtr-side{position:static}
  .mtr-footgrid{grid-template-columns:1fr 1fr}
}
@media (max-width:899px){
  .mtr-nav{display:none}
  .mtr-burger{display:block}
  .mtr-navcta .btn{display:none}
  .mtr-header .wrap{gap:12px}
  .mtr-nav.open{display:flex;position:absolute;top:72px;left:0;right:0;background:#fff;flex-direction:column;padding:12px 20px 20px;border-bottom:1px solid var(--line);box-shadow:0 20px 30px rgba(11,42,74,.12)}
  .mtr-dropmenu{position:static;box-shadow:none;border:0;padding:0 0 0 12px;display:block}
}
@media (max-width:640px){
  .mtr-dirgrid,.mtr-postgrid{grid-template-columns:1fr}
  .mtr-factgrid{grid-template-columns:1fr 1fr}
  .mtr-footgrid{grid-template-columns:1fr}
  .mtr-formrow{grid-template-columns:1fr}
  .mtr-topbar .wrap{flex-direction:column;gap:2px;text-align:center}
}
@media (hover: hover){
  .btn:hover{transform:translateY(-1px)}
  .mtr-dircard:hover,.mtr-postcard:hover{transform:translateY(-3px)}
}
@media (prefers-reduced-motion:reduce){
  *,*::before,*::after{animation-duration:.001s!important;transition-duration:.001s!important}
  html{scroll-behavior:auto}
  html.js .mtr-reveal{opacity:1;transform:none}
}

/* ---------- 蓝图工程美学（2026-10-11 视觉优化） ---------- */
.mtr-hero{background:radial-gradient(1100px 520px at 72% -10%,#17497E 0%,#0B2A4A 58%,#081F36 100%);color:#fff;position:relative;overflow:hidden}
.mtr-hero::after{content:"";position:absolute;inset:0;pointer-events:none;
background-image:linear-gradient(rgba(255,255,255,.05) 1px,transparent 1px),linear-gradient(90deg,rgba(255,255,255,.05) 1px,transparent 1px),linear-gradient(rgba(255,255,255,.09) 1px,transparent 1px),linear-gradient(90deg,rgba(255,255,255,.09) 1px,transparent 1px);
background-size:22px 22px,22px 22px,110px 110px,110px 110px}
/* 视觉签名：机芯剖面蓝图纸 */
.mtr-bp{margin:0}
.mtr-bp-frame{position:relative;border:1px solid rgba(233,242,251,.30);background:rgba(255,255,255,.025);padding:14px}
.mtr-bp-frame svg text{user-select:none}
.mtr-bp-corner{position:absolute;width:16px;height:16px;border:0 solid var(--accent)}
.mtr-bp-corner.tl{top:-2px;left:-2px;border-top-width:3px;border-left-width:3px}
.mtr-bp-corner.tr{top:-2px;right:-2px;border-top-width:3px;border-right-width:3px}
.mtr-bp-corner.bl{bottom:-2px;left:-2px;border-bottom-width:3px;border-left-width:3px}
.mtr-bp-corner.br{bottom:-2px;right:-2px;border-bottom-width:3px;border-right-width:3px}
.mtr-bp figcaption{color:#9FB3C8;font-size:13px;margin-top:10px}
/* hero 证据 chips */
.mtr-chips{display:flex;gap:10px;flex-wrap:wrap;margin-top:20px}
.mtr-chips span{font-family:ui-monospace,'SF Mono',Consolas,monospace;font-size:11px;letter-spacing:.12em;color:#DCE9F5;border:1px solid rgba(220,233,245,.38);background:rgba(255,255,255,.05);padding:7px 11px}
@media (max-width:900px){.mtr-bp-frame{padding:8px}}