/* KLUCWERK.eu – stal, grafit i żółty cynk (kolor pasywacji śrub) */
:root{
  --ink:#16212b; --ink2:#46545f; --paper:#eef1f4; --surface:#fff; --line:#c9d1d8;
  --steel:#1b2c3a; --steel2:#24394a; --on-steel:#e8edf1; --on-steel2:#a9b7c3;
  --zinc:#e3b23c; --zinc-ink:#7a5a0e; --link:#2b5878;
  --draw:#c9d6e0; --grid:rgba(255,255,255,.06);
  --head:'Barlow Semi Condensed','Arial Narrow',Arial,sans-serif;
  --body:'Barlow',system-ui,-apple-system,'Segoe UI',Roboto,Arial,sans-serif;
  --wrap:1180px;
}
@media (prefers-color-scheme:dark){:root:not([data-theme="light"]){
  --ink:#e3e8ec; --ink2:#a8b4be; --paper:#121b23; --surface:#18232d; --line:#2e3c48;
  --steel:#0d151c; --steel2:#16222c; --link:#8cbbe0; --zinc-ink:#e3b23c;
}}
:root[data-theme="dark"]{--ink:#e3e8ec; --ink2:#a8b4be; --paper:#121b23; --surface:#18232d; --line:#2e3c48; --steel:#0d151c; --steel2:#16222c; --link:#8cbbe0; --zinc-ink:#e3b23c}

*{box-sizing:border-box}
html{-webkit-text-size-adjust:100%;scroll-behavior:smooth}
@media (prefers-reduced-motion:reduce){html{scroll-behavior:auto}}
body{margin:0;background:var(--paper);color:var(--ink);font:400 1.0625rem/1.6 var(--body);overflow-x:hidden}
img,svg{max-width:100%}
a{color:var(--link);text-underline-offset:.18em}
a:hover{text-decoration-thickness:2px}
:focus-visible{outline:3px solid var(--zinc);outline-offset:2px}
h1,h2,h3{font-family:var(--head);font-weight:700;line-height:1.12;margin:0 0 .5em;letter-spacing:-.005em}
h1{font-size:clamp(2.2rem,4.6vw,3.6rem)}
h2{font-size:clamp(1.6rem,2.8vw,2.2rem)}
h3{font-size:1.28rem;font-weight:600}
p{margin:0 0 1em}
.wrap{max-width:var(--wrap);margin:0 auto;padding:0 24px}
.narrow>*{max-width:820px}
.muted,.note{color:var(--ink2)}
.note{font-size:.94rem}
.small{font-size:.85rem}
.skip{position:absolute;left:-999px;top:8px;background:var(--zinc);color:#000;padding:8px 12px;z-index:9}
.skip:focus{left:8px}

/* przyciski */
.btn{display:inline-block;font:600 1rem/1 var(--body);padding:14px 22px;border-radius:3px;background:var(--link);color:#fff;text-decoration:none;border:2px solid var(--link);cursor:pointer}
.btn:hover{filter:brightness(1.1)}
.btn-o{background:transparent;color:var(--on-steel);border-color:var(--on-steel2)}
.btn-z{background:var(--zinc);border-color:var(--zinc);color:#1b1404}
.btn-s{padding:10px 14px;font-size:.92rem;background:var(--zinc);border-color:var(--zinc);color:#1b1404;white-space:nowrap}
.more{font-weight:600}

/* nagłówek */
.top{background:var(--steel);color:var(--on-steel);border-bottom:1px solid rgba(255,255,255,.08);position:sticky;top:0;z-index:5}
.top-in{display:flex;align-items:center;gap:20px;min-height:64px}
.brand{display:flex;align-items:center;gap:10px;color:inherit;text-decoration:none;font:700 1.45rem/1 var(--head);letter-spacing:.06em}
.brand .mark{width:28px;height:28px;flex:none;color:var(--zinc)}
.nav{margin-left:auto}
.nav ul,.lang ul,.burger ul{list-style:none;margin:0;padding:0}
.nav ul{display:flex;gap:4px}
.nav a{white-space:nowrap;color:var(--on-steel);text-decoration:none;padding:8px 10px;border-radius:3px;font-weight:500;font-size:.98rem}
.nav a:hover,.nav a[aria-current]{background:rgba(255,255,255,.08)}
.nav a[aria-current]{box-shadow:inset 0 -2px 0 var(--zinc)}
details>summary{list-style:none;cursor:pointer}
details>summary::-webkit-details-marker{display:none}
.lang{position:relative}
.lang summary{padding:8px 10px;border:1px solid rgba(255,255,255,.25);border-radius:3px;font-weight:600;font-size:.9rem}
.lang ul{position:absolute;right:0;top:calc(100% + 8px);background:var(--surface);color:var(--ink);border:1px solid var(--line);border-radius:4px;min-width:190px;padding:6px;box-shadow:0 12px 30px rgba(0,0,0,.25)}
.lang a{display:block;padding:8px 10px;color:var(--ink);text-decoration:none;border-radius:3px}
.lang a b{display:inline-block;width:2.2em;color:var(--ink2)}
.lang a:hover{background:var(--paper)}
.lang a[aria-current]{font-weight:600}
.burger{display:none}
@media (max-width:1180px){
  .nav,.top-in>.btn-s{display:none}
  .lang{margin-left:auto}
  .burger{display:block}
  .burger summary{width:42px;height:42px;display:grid;place-items:center;border:1px solid rgba(255,255,255,.25);border-radius:3px}
  .burger summary span,.burger summary span::before,.burger summary span::after{display:block;width:18px;height:2px;background:var(--on-steel);position:relative;content:""}
  .burger summary span::before{position:absolute;top:-6px}.burger summary span::after{position:absolute;top:6px}
  .burger nav{position:absolute;left:0;right:0;top:64px;background:var(--steel);border-top:1px solid rgba(255,255,255,.1);padding:8px 16px 16px}
  .burger a{display:block;color:var(--on-steel);padding:12px 4px;text-decoration:none;border-bottom:1px solid rgba(255,255,255,.08);font-weight:500}
}

/* hero z rysunkiem technicznym */
.hero{background:var(--steel);color:var(--on-steel);padding:56px 0 64px}
.hero-in{display:grid;grid-template-columns:1fr 1.05fr;gap:48px;align-items:center}
.hero h1{max-width:14ch}
.hero .lead{font-size:1.18rem;color:var(--on-steel2);max-width:52ch}
.acts{display:flex;flex-wrap:wrap;gap:12px;margin-top:28px}
.hero-d{margin:0;background:var(--steel2);border:1px solid rgba(255,255,255,.08);border-radius:4px;padding:10px}
.hero-d figcaption{font-size:.9rem;color:var(--on-steel2);padding:8px 6px 2px}
.draw{display:block;width:100%;height:auto}
.draw .lbl text{font:600 14px var(--head);letter-spacing:.02em}
@media (max-width:860px){.hero-in{grid-template-columns:1fr;gap:32px}.hero{padding:40px 0 48px}}

/* fakty */
.facts{background:var(--surface);border-bottom:1px solid var(--line)}
.facts ul{list-style:none;margin:0;padding:0;display:grid;grid-template-columns:repeat(4,1fr)}
.facts li{padding:22px 20px 22px 0;display:flex;flex-direction:column;gap:2px}
.facts li+li{padding-left:20px;border-left:1px solid var(--line)}
.facts b{font:700 1.6rem/1.1 var(--head)}
.facts span{color:var(--ink2);font-size:.95rem;line-height:1.35}
@media (max-width:760px){.facts ul{grid-template-columns:1fr 1fr}.facts li:nth-child(3){padding-left:0;border-left:0}.facts li:nth-child(n+3){border-top:1px solid var(--line)}}

/* sekcje */
.sec{padding:64px 0}
.sec-alt{background:var(--surface);border-block:1px solid var(--line)}
.lead2{color:var(--ink2);max-width:70ch;font-size:1.08rem;margin-bottom:28px}

/* lista produktów – jak karta katalogowa */
.range{list-style:none;margin:0;padding:0;border-top:2px solid var(--ink)}
.range li{display:grid;grid-template-columns:minmax(180px,1fr) 2fr minmax(200px,1fr);gap:24px;padding:20px 0;border-bottom:1px solid var(--line);align-items:baseline}
.range h3,.range p{margin:0}
.range .spec{font-weight:600;color:var(--zinc-ink)}
@media (max-width:760px){.range li{grid-template-columns:1fr;gap:6px}}

/* tabela rozstawów */
.tbl-wrap{overflow-x:auto;border:1px solid var(--line);border-radius:4px;background:var(--surface)}
table{border-collapse:collapse;width:100%}
.fit th,.fit td{padding:11px 14px;text-align:left;border-bottom:1px solid var(--line);white-space:nowrap;font-variant-numeric:tabular-nums}
.fit thead th{background:var(--steel);color:var(--on-steel);font-weight:600;font-size:.94rem}
.fit tbody th{font-weight:600}
.fit tbody tr:last-child>*{border-bottom:0}
.fit tbody tr:hover{background:var(--paper)}
.note{margin-top:12px}

/* zalety */
.why{list-style:none;margin:0 0 20px;padding:0;display:grid;grid-template-columns:1fr 1fr;gap:28px 48px}
.why li{border-left:3px solid var(--zinc);padding-left:18px}
.why p{margin:0;color:var(--ink2)}
@media (max-width:760px){.why{grid-template-columns:1fr}}

.band{background:var(--steel);color:var(--on-steel);padding:48px 0}
.band-in{display:flex;justify-content:space-between;align-items:center;gap:32px;flex-wrap:wrap}
.band-in>div{max-width:62ch}
.band p{color:var(--on-steel2);margin:0}
.band .band-big{font:600 1.5rem/1.3 var(--head);color:var(--on-steel)}

.revs p{max-width:70ch}

/* FAQ */
.qa{border-bottom:1px solid var(--line)}
.qa summary{display:flex;justify-content:space-between;gap:16px;padding:18px 0;align-items:center}
.qa summary h3{margin:0;font-size:1.18rem}
.qa summary::after{content:"";flex:none;width:12px;height:12px;border-right:2px solid var(--ink2);border-bottom:2px solid var(--ink2);transform:rotate(45deg) translateY(-3px);transition:transform .2s}
.qa[open] summary::after{transform:rotate(-135deg) translateY(-3px)}
.qa p{color:var(--ink2);padding-bottom:12px;max-width:70ch}
@media (prefers-reduced-motion:reduce){.qa summary::after{transition:none}}

/* podstrony */
.phead{background:var(--steel);color:var(--on-steel);padding:28px 0 48px}
.phead .lead{color:var(--on-steel2);font-size:1.15rem;max-width:62ch}
.crumbs ol{list-style:none;margin:0 0 28px;padding:0;display:flex;flex-wrap:wrap;gap:8px;font-size:.9rem;color:var(--on-steel2)}
.crumbs li+li::before{content:"/";margin-right:8px;opacity:.6}
.crumbs a{color:var(--on-steel2)}
.wgrid{display:grid;grid-template-columns:1fr 1fr;gap:40px 56px}
.wsec{border-top:2px solid var(--ink);padding-top:18px}
.wsec p{color:var(--ink2);margin:0}
@media (max-width:760px){.wgrid{grid-template-columns:1fr;gap:28px}}
.cmp th,.cmp td{text-align:left;padding:14px 0;border-bottom:1px solid var(--line);vertical-align:top}
.cmp th{font-weight:500;color:var(--ink2);width:45%;padding-right:20px}
.cmp td{font-weight:600}
.cut td{font-variant-numeric:tabular-nums}
.b2b-top{display:grid;grid-template-columns:1fr 2fr;gap:56px}
.b2b-top .why{grid-template-columns:1fr}
@media (max-width:860px){.b2b-top{grid-template-columns:1fr;gap:32px}}
.ticks{list-style:none;margin:0;padding:0}
.ticks li{padding:10px 0 10px 30px;border-bottom:1px solid var(--line);position:relative}
.ticks li::before{content:"";position:absolute;left:4px;top:17px;width:12px;height:7px;border-left:2px solid var(--zinc-ink);border-bottom:2px solid var(--zinc-ink);transform:rotate(-45deg)}
.steps{list-style:none;counter-reset:s;margin:0;padding:0;display:grid;grid-template-columns:repeat(3,1fr);gap:32px}
.steps li{counter-increment:s;border-top:2px solid var(--ink);padding-top:16px}
.steps li::before{content:counter(s);font:700 2rem/1 var(--head);color:var(--zinc-ink);display:block;margin-bottom:10px}
.steps p{color:var(--ink2);margin:0}
@media (max-width:760px){.steps{grid-template-columns:1fr}}
.ship-grid{display:grid;grid-template-columns:repeat(3,1fr);gap:40px}
.ship-grid p{color:var(--ink2)}
@media (max-width:860px){.ship-grid{grid-template-columns:1fr;gap:28px}}
.legal section{margin-bottom:28px}
.legal p{color:var(--ink2)}

/* formularz */
.form{display:grid;grid-template-columns:1fr 1fr;gap:16px 20px;margin:24px 0}
.form label{display:flex;flex-direction:column;gap:6px;font-weight:600;font-size:.95rem}
.form .full{grid-column:1/-1}
.form input,.form textarea{font:inherit;font-weight:400;padding:12px;border:1px solid var(--line);border-radius:3px;background:var(--surface);color:var(--ink)}
.form input:focus,.form textarea:focus{outline:2px solid var(--link);outline-offset:0;border-color:var(--link)}
@media (max-width:600px){.form{grid-template-columns:1fr}}

/* kontakt i stopka */
.contact{background:var(--surface);border-top:1px solid var(--line);padding:56px 0}
.contact-in{display:grid;grid-template-columns:1fr 1.4fr;gap:40px}
.cdl{margin:0;display:grid;gap:14px}
.cdl div{display:grid;grid-template-columns:160px 1fr;gap:12px;border-bottom:1px solid var(--line);padding-bottom:12px}
.cdl dt{color:var(--ink2)}
.cdl dd{margin:0;font-weight:600}
@media (max-width:760px){.contact-in{grid-template-columns:1fr}.cdl div{grid-template-columns:1fr;gap:2px}}
.foot{background:var(--steel);color:var(--on-steel2);padding:40px 0;font-size:.94rem}
.foot a{color:var(--on-steel)}
.foot-brand{display:flex;align-items:center;gap:10px;color:var(--on-steel);font-weight:600}
.foot-brand .mark{width:22px;height:22px;color:var(--zinc);flex:none}
.foot-l{display:flex;flex-wrap:wrap;gap:6px 16px}
@media (max-width:480px){.wrap{padding:0 16px}.sec{padding:48px 0}}
.callout{margin-top:32px;background:var(--surface);border:1px solid var(--line);border-left:4px solid var(--zinc);border-radius:4px;padding:20px 24px}
.callout h2{font-size:1.35rem}
.callout p{margin:0;color:var(--ink2)}