/* ---------- tokens ---------- */
:root{
  color-scheme:light dark;
  --bg:#F4F2F0;
  --surface:#FFFFFF;
  --surface-2:#EBE7E3;
  --ink:#191512;
  --ink-2:#5E5751;
  --line:#DCD6D0;
  --line-strong:#C3BBB3;
  --accent:#C0261A;
  --accent-ink:#96190F;
  --steel:#262C31;
  --steel-ink:#E9E6E2;
  --steel-ink-2:#A6AEB4;
  --steel-line:#3B434A;
  --ok:#2F6B3A;
  --ok-wash:#E7F0E6;
  --wait:#8A6412;
  --wait-wash:#F7EEDA;
  --shadow:0 1px 2px rgba(25,21,18,.06), 0 8px 24px -16px rgba(25,21,18,.22);
  --display:"Oswald","Arial Narrow",Arial,sans-serif;
  --body:"IBM Plex Sans","Segoe UI",Tahoma,sans-serif;
  --mono:"IBM Plex Mono",Consolas,monospace;
  --wrap:1120px;
}
@media (prefers-color-scheme: dark){
  :root:not([data-theme="light"]){
    --bg:#15171A;
    --surface:#1D2126;
    --surface-2:#242A30;
    --ink:#ECEAE7;
    --ink-2:#A3A9AE;
    --line:#2E353B;
    --line-strong:#414A52;
    --accent:#E8503F;
    --accent-ink:#FF8574;
    --steel:#0F1114;
    --steel-ink:#ECEAE7;
    --steel-ink-2:#9AA2A8;
    --steel-line:#262C31;
    --ok:#6FBE80;
    --ok-wash:#18241A;
    --wait:#D9AE55;
    --wait-wash:#251E10;
    --shadow:0 1px 2px rgba(0,0,0,.4), 0 8px 24px -16px rgba(0,0,0,.6);
  }
}
:root[data-theme="dark"]{
  --bg:#15171A; --surface:#1D2126; --surface-2:#242A30;
  --ink:#ECEAE7; --ink-2:#A3A9AE; --line:#2E353B; --line-strong:#414A52;
  --accent:#E8503F; --accent-ink:#FF8574;
  --steel:#0F1114; --steel-ink:#ECEAE7; --steel-ink-2:#9AA2A8; --steel-line:#262C31;
  --ok:#6FBE80; --ok-wash:#18241A; --wait:#D9AE55; --wait-wash:#251E10;
  --shadow:0 1px 2px rgba(0,0,0,.4), 0 8px 24px -16px rgba(0,0,0,.6);
}

/* ---------- reset ---------- */
*,*::before,*::after{box-sizing:border-box}
body{margin:0;background:var(--bg);color:var(--ink);font:400 16px/1.6 var(--body);-webkit-font-smoothing:antialiased}
img{max-width:100%;display:block}
[hidden]{display:none!important}
a{color:inherit}
h1,h2,h3{margin:0;font-family:var(--display);font-weight:600;line-height:1.1;text-wrap:balance;letter-spacing:.005em}
p{margin:0}
:focus-visible{outline:2px solid var(--accent);outline-offset:3px}
@media (prefers-reduced-motion: reduce){*{transition:none!important;animation:none!important}}

.wrap{width:100%;max-width:var(--wrap);margin-inline:auto;padding-inline:20px}
.eyebrow{font:500 12px/1 var(--mono);letter-spacing:.14em;text-transform:uppercase;color:var(--ink-2)}
.spec{font:400 13px/1.5 var(--mono);color:var(--ink-2)}
.rule{border:0;border-top:1px solid var(--line);margin:0}
section{padding-block:clamp(40px,5vw,68px)}
.sec-head{margin-bottom:28px}
.sec-head h2{font-size:clamp(24px,3.2vw,34px);margin-top:10px}
.sec-head p{color:var(--ink-2);max-width:66ch;margin-top:10px}

/* ---------- header ---------- */
header.top{position:sticky;top:env(safe-area-inset-top,0px);z-index:40;background:var(--bg);border-bottom:1px solid var(--line)}
.top-in{display:flex;align-items:center;gap:20px;min-height:64px;flex-wrap:wrap;padding-block:10px}
.brand{display:flex;align-items:center;gap:10px;text-decoration:none;margin-right:auto}
.brand-mark{width:26px;height:26px;flex:none}
.brand-name{font-family:var(--display);font-size:20px;font-weight:600;letter-spacing:.06em;text-transform:uppercase}
.brand-sub{display:block;font:400 11px/1.2 var(--mono);color:var(--ink-2);letter-spacing:.06em}
nav.main{display:flex;gap:20px;flex-wrap:wrap}
nav.main a{font-size:14.5px;text-decoration:none;color:var(--ink-2);padding-block:4px;border-bottom:1px solid transparent}
nav.main a:hover{color:var(--ink);border-bottom-color:var(--accent)}
nav.main a[aria-current="page"]{color:var(--ink);border-bottom-color:var(--accent)}
.tel-btn{display:inline-flex;align-items:center;gap:8px;text-decoration:none;background:var(--accent);color:#fff;font:500 15px var(--mono);letter-spacing:.02em;padding:9px 16px;border-radius:2px;white-space:nowrap}
.tel-btn:hover{background:var(--accent-ink)}

/* ---------- buttons ---------- */
.btn{display:inline-flex;align-items:center;gap:9px;text-decoration:none;font-weight:500;font-size:15.5px;padding:12px 20px;border-radius:2px;border:1px solid transparent;cursor:pointer;font-family:var(--body)}
.btn-primary{background:var(--accent);color:#fff}
.btn-primary:hover{background:var(--accent-ink)}
.btn-ghost{border-color:var(--line-strong);color:var(--ink);background:transparent}
.btn-ghost:hover{border-color:var(--ink);background:var(--surface)}
.cta-row{display:flex;flex-wrap:wrap;gap:12px;margin-top:26px}

/* ---------- hero (home) ---------- */
.hero{padding-block:clamp(36px,6vw,72px) clamp(28px,4vw,52px)}
.hero-grid{display:grid;grid-template-columns:minmax(0,1.25fr) minmax(280px,.75fr);gap:clamp(24px,4vw,56px);align-items:start}
.hero h1{font-size:clamp(30px,5.2vw,52px);max-width:22ch;margin-block:14px 18px}
.hero .lead{font-size:clamp(16px,1.6vw,18.5px);color:var(--ink-2);max-width:62ch}

/* шильдик: nameplate card, like the plate riveted to a valve body */
.plate{background:var(--steel);color:var(--steel-ink);border-radius:3px;padding:20px 22px 22px;box-shadow:var(--shadow);position:relative;background-image:repeating-linear-gradient(180deg,rgba(255,255,255,.035) 0 1px,transparent 1px 4px)}
.plate::after{content:"";position:absolute;inset:7px;border:1px solid var(--steel-line);border-radius:2px;pointer-events:none}
.plate-h{font:500 11px/1 var(--mono);letter-spacing:.16em;text-transform:uppercase;color:var(--steel-ink-2);padding-bottom:12px;border-bottom:1px solid var(--steel-line)}
.plate dl{display:grid;grid-template-columns:auto 1fr;gap:0;margin:0;font-family:var(--mono);font-size:13px}
.plate dt{color:var(--steel-ink-2);padding:9px 14px 9px 0;border-bottom:1px solid var(--steel-line);letter-spacing:.04em}
.plate dd{margin:0;padding:9px 0;border-bottom:1px solid var(--steel-line);text-align:right;font-variant-numeric:tabular-nums}
.plate dl > :nth-last-child(-n+2){border-bottom:0}
.plate-note{margin-top:14px;font:400 12.5px/1.45 var(--body);color:var(--steel-ink-2)}

/* ---------- category page head ---------- */
.crumbs{font:400 13px var(--mono);color:var(--ink-2);padding-top:22px}
.crumbs a{text-decoration:none;border-bottom:1px solid var(--line-strong)}
.crumbs a:hover{border-bottom-color:var(--accent)}
.page-head{padding-block:22px clamp(28px,4vw,44px)}
.page-head h1{font-size:clamp(28px,4.4vw,44px);max-width:20ch;margin-block:12px 16px}
.page-head .lead{font-size:clamp(16px,1.5vw,18px);color:var(--ink-2);max-width:64ch}
.page-grid{display:grid;grid-template-columns:minmax(0,1.3fr) minmax(270px,.7fr);gap:clamp(24px,4vw,48px);align-items:start}

/* ---------- prose ---------- */
.prose{max-width:68ch}
.prose h2{font-size:clamp(21px,2.4vw,27px);margin-top:36px;margin-bottom:12px}
.prose h3{font-size:18px;margin-top:24px;margin-bottom:8px}
.prose p{margin-top:12px;color:var(--ink-2)}
.prose ul{margin:12px 0 0;padding-left:20px;color:var(--ink-2);display:flex;flex-direction:column;gap:6px}
.prose strong{color:var(--ink);font-weight:600}

/* ---------- spec table ---------- */
.specs{width:100%;border-collapse:collapse;margin-top:16px;font-size:14.5px;background:var(--surface);border:1px solid var(--line)}
.specs th,.specs td{text-align:left;padding:11px 14px;border-bottom:1px solid var(--line);vertical-align:top}
.specs th{font:500 12px var(--mono);letter-spacing:.06em;text-transform:uppercase;color:var(--ink-2);white-space:nowrap;width:1%;border-right:1px solid var(--line)}
.specs tr:last-child th,.specs tr:last-child td{border-bottom:0}

/* ---------- catalog index: groups by purpose, one link per product page ---------- */
.cat-index{display:grid;grid-template-columns:repeat(auto-fit,minmax(240px,1fr));gap:18px;align-items:start}
.cat-col{background:var(--surface);border:1px solid var(--line);border-top:3px solid var(--accent);border-radius:2px;padding:18px 18px 6px}
.cat-col h3{font-size:16.5px;letter-spacing:.04em;text-transform:uppercase}
.cat-col .note{font-size:13.5px;color:var(--ink-2);margin-top:4px;margin-bottom:10px}
.cat-col ul{list-style:none;margin:0;padding:0}
.cat-col li{border-top:1px solid var(--line)}
.cat-col a{display:flex;justify-content:space-between;align-items:baseline;gap:12px;padding:11px 0;text-decoration:none}
.cat-col a:hover .nm{color:var(--accent)}
.cat-col .nm{font-weight:500;font-size:15px}
.cat-col .dn{font:400 12.5px var(--mono);color:var(--ink-2);white-space:nowrap}

/* ---------- marking decoder ---------- */
.mark-grid{display:grid;grid-template-columns:minmax(0,1.2fr) minmax(260px,.8fr);gap:clamp(24px,4vw,48px);align-items:start}
.decode{display:flex;flex-wrap:wrap;gap:6px;margin-bottom:6px}
.decode span{display:flex;flex-direction:column;align-items:center;min-width:76px;padding:12px 12px 0;border-top:3px solid var(--accent)}
.decode b{font:600 30px/1 var(--mono);color:var(--ink)}
.decode i{font:400 11.5px/1.35 var(--mono);font-style:normal;color:var(--ink-2);text-align:center;margin-top:8px}
.mark-grid .specs{margin-top:0}
.specs td a{text-decoration:none;border-bottom:1px solid var(--line-strong)}
.specs td a:hover{color:var(--accent);border-bottom-color:var(--accent)}

/* ---------- stock table ---------- */
.stock-bar{display:flex;flex-wrap:wrap;gap:12px;align-items:center;margin-bottom:14px}
.stock-bar input,.stock-bar select{font:400 15px var(--body);color:var(--ink);background:var(--surface);border:1px solid var(--line-strong);border-radius:2px;padding:10px 12px}
.stock-bar input{flex:1 1 260px;min-width:0}
.count{font:400 13px var(--mono);color:var(--ink-2);margin-left:auto}
.flag-row{margin-bottom:16px}
.demo-flag{display:inline-flex;align-items:center;gap:7px;background:var(--wait-wash);color:var(--wait);border:1px solid currentColor;border-radius:2px;padding:5px 10px;font:500 12px var(--mono);letter-spacing:.06em;text-transform:uppercase}
.t-scroll{overflow-x:auto;border:1px solid var(--line);border-radius:2px;background:var(--surface)}
table.stock{width:100%;border-collapse:collapse;font-size:14.5px;min-width:620px}
table.stock thead th{text-align:left;font:500 11.5px var(--mono);letter-spacing:.1em;text-transform:uppercase;color:var(--ink-2);padding:12px 14px;border-bottom:1px solid var(--line-strong);white-space:nowrap;background:var(--surface-2)}
table.stock tbody td{padding:11px 14px;border-bottom:1px solid var(--line);vertical-align:top}
table.stock tbody tr:last-child td{border-bottom:0}
table.stock td.num{font-family:var(--mono);font-variant-numeric:tabular-nums;white-space:nowrap}
.pill{display:inline-block;font:500 12px var(--mono);padding:3px 9px;border-radius:2px;white-space:nowrap}
.pill.yes{background:var(--ok-wash);color:var(--ok)}
.pill.no{background:var(--wait-wash);color:var(--wait)}
.empty{padding:28px 14px;color:var(--ink-2);text-align:center}

/* ---------- steps: a real sequence, so the numbers carry information ---------- */
.steps{display:grid;grid-template-columns:repeat(auto-fit,minmax(260px,1fr));gap:20px;counter-reset:s}
.step{counter-increment:s;padding-top:18px;border-top:2px solid var(--ink)}
.step::before{content:counter(s,decimal-leading-zero);display:block;font:500 13px var(--mono);color:var(--accent);letter-spacing:.1em;margin-bottom:8px}
.step h3{font-size:18px;margin-bottom:7px}
.step p{color:var(--ink-2);font-size:14.8px}

/* ---------- why / audience ---------- */
.why{display:grid;grid-template-columns:repeat(auto-fit,minmax(272px,1fr));gap:1px;background:var(--line);border:1px solid var(--line)}
.why > div{background:var(--surface);padding:22px}
.why h3{font-size:17.5px;margin-bottom:8px}
.why p{color:var(--ink-2);font-size:14.8px}
ul.who{display:flex;flex-wrap:wrap;gap:10px;padding:0;margin:0}
ul.who li{list-style:none;border:1px solid var(--line-strong);border-radius:2px;padding:8px 14px;font-size:14.5px;background:var(--surface)}

/* ---------- FAQ ---------- */
.faq{margin-top:16px;border-top:1px solid var(--line)}
.faq details{border-bottom:1px solid var(--line)}
.faq summary{cursor:pointer;padding:15px 0;font-weight:500;font-size:16px;list-style:none;display:flex;gap:12px;align-items:baseline}
.faq summary::-webkit-details-marker{display:none}
.faq summary::before{content:"+";color:var(--accent);font-family:var(--mono);font-weight:500;flex:none}
.faq details[open] summary::before{content:"–"}
.faq p{padding:0 0 16px 24px;color:var(--ink-2);max-width:66ch}

/* ---------- related links ---------- */
.related{display:flex;flex-wrap:wrap;gap:10px;margin-top:16px;padding:0;list-style:none}
.related a{display:inline-block;text-decoration:none;border:1px solid var(--line-strong);border-radius:2px;padding:8px 14px;font-size:14.5px;background:var(--surface)}
.related a:hover{border-color:var(--accent);color:var(--accent)}

/* ---------- contact ---------- */
.contact{background:var(--steel);color:var(--steel-ink)}
.contact .eyebrow,.contact .sec-head p{color:var(--steel-ink-2)}
.contact-grid{display:grid;grid-template-columns:repeat(auto-fit,minmax(288px,1fr));gap:clamp(24px,4vw,48px);align-items:start}
.cinfo dl{display:grid;grid-template-columns:auto 1fr;margin:0;font-size:15px}
.cinfo dt{font:500 11.5px var(--mono);letter-spacing:.1em;text-transform:uppercase;color:var(--steel-ink-2);padding:13px 18px 13px 0;border-bottom:1px solid var(--steel-line)}
.cinfo dd{margin:0;padding:13px 0;border-bottom:1px solid var(--steel-line)}
.cinfo a{color:var(--steel-ink);text-decoration:none;border-bottom:1px solid var(--steel-line)}
.cinfo a:hover{border-bottom-color:currentColor}
.msg-row{display:flex;gap:10px;flex-wrap:wrap;margin-top:20px}
.msg-row .btn-ghost{border-color:var(--steel-line);color:var(--steel-ink)}
.msg-row .btn-ghost:hover{border-color:var(--steel-ink);background:rgba(255,255,255,.06)}
.req{background:rgba(255,255,255,.04);border:1px solid var(--steel-line);border-radius:3px;padding:22px}
.req h3{font-size:19px;margin-bottom:6px}
.req > p{font-size:14px;color:var(--steel-ink-2);margin-bottom:16px}
.field{display:flex;flex-direction:column;gap:6px;margin-bottom:14px}
.field label{font:500 11.5px var(--mono);letter-spacing:.1em;text-transform:uppercase;color:var(--steel-ink-2)}
.field input,.field textarea{font:400 15px/1.5 var(--body);color:var(--steel-ink);background:rgba(0,0,0,.25);border:1px solid var(--steel-line);border-radius:2px;padding:11px 12px;width:100%}
.field textarea{resize:vertical;min-height:92px}
.field input::placeholder,.field textarea::placeholder{color:#7C858C}
.form-note{margin-top:12px;font-size:13.5px;color:var(--steel-ink-2)}
.form-note[data-state="warn"]{color:var(--wait)}

footer.bottom{background:var(--steel);border-top:1px solid var(--steel-line);color:var(--steel-ink-2);font-size:13.5px;padding-block:24px}
.foot-in{display:flex;flex-wrap:wrap;gap:12px 28px;align-items:baseline}
.foot-links{display:flex;flex-wrap:wrap;gap:6px 16px}
footer.bottom a{color:var(--steel-ink-2)}

@media (max-width:880px){
  .hero-grid,.page-grid,.mark-grid{grid-template-columns:1fr}
  nav.main{order:3;width:100%;gap:16px;border-top:1px solid var(--line);padding-top:10px}
}

/* contact methods shown in place of the form until it has a mailbox */
.ways{display:grid;grid-template-columns:auto 1fr;margin:18px 0 0;font-size:15px}
.ways dt{padding:13px 18px 13px 0;border-bottom:1px solid var(--steel-line)}
.ways dt a{color:var(--steel-ink);text-decoration:none;font-weight:500;border-bottom:1px solid var(--accent)}
.ways dt a:hover{color:var(--accent-ink)}
.ways dd{margin:0;padding:13px 0;border-bottom:1px solid var(--steel-line);color:var(--steel-ink-2);font:400 13.5px var(--mono);text-align:right}
.ways > :nth-last-child(-n+2){border-bottom:0}