:root{
  --ink:#0F1216; --ink-2:#5A6675; --panel:#14181F; --panel-2:#1C222C;
  --surface:#FFFFFF; --surface-2:#F4F6F9; --line:#E4E8EE;
  --brand:#0B5FFF; --brand-d:#0848C7; --fuel:#FF7A18; --fuel-d:#E5650B;
  --go:#13B36A; --warn:#F4A300; --bad:#E23A3A;
  --r:16px; --r-s:10px; --maxw:1080px;
  --shadow:0 1px 2px rgba(15,18,22,.06),0 8px 24px rgba(15,18,22,.06);
  --shadow-lg:0 12px 40px rgba(15,18,22,.16);
  --f-disp:"Space Grotesk",-apple-system,BlinkMacSystemFont,"Segoe UI",sans-serif;
  --f-body:"Inter",-apple-system,BlinkMacSystemFont,"Segoe UI",Roboto,sans-serif;
  --f-mono:"Space Mono","JetBrains Mono",ui-monospace,SFMono-Regular,Menlo,monospace;
}
*{box-sizing:border-box}
html{-webkit-text-size-adjust:100%}
body{
  margin:0;font-family:var(--f-body);color:var(--ink);background:var(--surface-2);
  line-height:1.65;font-size:clamp(15px,1.6vw,16.5px);-webkit-font-smoothing:antialiased;
}
.wrap{width:100%;max-width:var(--maxw);margin:0 auto;padding:0 clamp(16px,4vw,28px)}
a{color:var(--brand);text-decoration:none}
a:hover{text-decoration:underline}
img{max-width:100%;height:auto}
h1,h2,h3,h4,h5,h6{font-family:var(--f-disp);line-height:1.15;letter-spacing:-.01em;margin:0 0 .5em}
h1{font-size:clamp(1.7rem,5.2vw,2.7rem);font-weight:700}
h2{font-size:clamp(1.35rem,3.6vw,1.9rem);font-weight:600;margin-top:1.6em}
h3{font-size:clamp(1.12rem,2.6vw,1.35rem);font-weight:600;margin-top:1.3em}
h4{font-size:1.02rem;font-weight:600;margin-top:1.1em}
p{margin:0 0 1em}
ul,ol{margin:0 0 1em;padding-left:1.3em}
li{margin:.3em 0}
:focus-visible{outline:3px solid var(--brand);outline-offset:2px;border-radius:6px}

/* ---------- Topbar / nawigacja (czysty HTML, bez JS) ---------- */
.topbar{background:var(--panel);color:#fff;position:sticky;top:0;z-index:50;
  border-bottom:1px solid #222a36}
.topbar .wrap{display:flex;align-items:center;gap:14px;min-height:60px;flex-wrap:wrap}
.brand{display:flex;align-items:center;gap:9px;font-family:var(--f-disp);font-weight:700;
  font-size:1.12rem;color:#fff;text-decoration:none;white-space:nowrap}
.brand:hover{text-decoration:none}
.brand .mark{width:30px;height:30px;flex:0 0 auto}
.brand b{color:var(--fuel)}
.nav{display:flex;gap:2px;flex-wrap:wrap;margin-left:auto;align-items:center}
.nav a{color:#cdd5e0;padding:8px 11px;border-radius:8px;font-size:.93rem;font-weight:500}
.nav a:hover{background:#222a36;color:#fff;text-decoration:none}
.nav a[aria-current="page"]{background:var(--fuel);color:#10131a;font-weight:600}
.nav details{position:relative}
.nav summary{list-style:none;cursor:pointer;color:#cdd5e0;padding:8px 11px;border-radius:8px;
  font-size:.93rem;font-weight:500}
.nav summary::-webkit-details-marker{display:none}
.nav summary::after{content:"▾";margin-left:5px;font-size:.8em;opacity:.7}
.nav summary:hover{background:#222a36;color:#fff}
.nav details[open] .menu{display:block}
.menu{display:none;position:absolute;right:0;top:calc(100% + 6px);background:#fff;
  border:1px solid var(--line);border-radius:12px;box-shadow:var(--shadow-lg);
  min-width:250px;padding:6px;z-index:60}
.menu a{display:block;color:var(--ink);padding:9px 11px;border-radius:8px;font-size:.92rem;font-weight:500}
.menu a:hover{background:var(--surface-2);text-decoration:none}

/* ---------- Breadcrumb ---------- */
.crumbs{font-size:.85rem;color:var(--ink-2);padding:12px 0 0}
.crumbs ol{list-style:none;display:flex;flex-wrap:wrap;gap:6px;padding:0;margin:0}
.crumbs li::after{content:"›";margin-left:6px;color:#aab2bd}
.crumbs li:last-child::after{content:""}
.crumbs a{color:var(--ink-2)}

/* ---------- Hero ---------- */
.hero{padding:clamp(20px,4vw,40px) 0 6px}
.hero .lead{font-size:clamp(1.02rem,2.2vw,1.18rem);color:var(--ink-2);max-width:62ch;margin:.2em 0 0}
.byline{font-size:.82rem;color:var(--ink-2);margin:.7em 0 0;font-family:var(--f-mono)}
.byline a{color:var(--ink-2);text-decoration:underline}
.eyebrow{font-family:var(--f-mono);text-transform:uppercase;letter-spacing:.14em;
  font-size:.72rem;color:var(--fuel);font-weight:700;margin:0 0 10px}

/* ---------- Karta kalkulatora ---------- */
.calc{background:var(--surface);border:1px solid var(--line);border-radius:var(--r);
  box-shadow:var(--shadow);padding:clamp(16px,3.5vw,26px);margin:18px 0 8px}
.calc h2{margin-top:0}
.fields{display:grid;gap:14px;grid-template-columns:1fr}
@media(min-width:560px){.fields.two{grid-template-columns:1fr 1fr}
  .fields.three{grid-template-columns:1fr 1fr}}
@media(min-width:820px){.fields.three{grid-template-columns:1fr 1fr 1fr}}
.field label{display:block;font-weight:600;font-size:.9rem;margin-bottom:6px}
.field .hint{font-weight:400;color:var(--ink-2);font-size:.82rem}
.field .ig{display:flex;align-items:stretch;border:1.5px solid var(--line);border-radius:var(--r-s);
  overflow:hidden;background:#fff;transition:border-color .15s}
.field .ig:focus-within{border-color:var(--brand)}
.field input,.field select{width:100%;border:0;padding:13px 14px;font-size:1.02rem;
  font-family:var(--f-body);background:transparent;outline:none;color:var(--ink);min-width:0}
.field select{padding-right:8px}
.field .unit{display:flex;align-items:center;padding:0 13px;background:var(--surface-2);
  color:var(--ink-2);font-size:.9rem;font-weight:600;border-left:1.5px solid var(--line);white-space:nowrap}
.actions{display:flex;flex-wrap:wrap;gap:10px;margin-top:18px}
.btn{appearance:none;border:0;cursor:pointer;font-family:var(--f-disp);font-weight:600;
  font-size:1rem;padding:13px 22px;border-radius:var(--r-s);transition:transform .05s,background .15s}
.btn:active{transform:translateY(1px)}
.btn-primary{background:var(--fuel);color:#10131a;flex:1 1 auto;min-width:180px}
.btn-primary:hover{background:var(--fuel-d)}
.btn-ghost{background:var(--surface-2);color:var(--ink);border:1.5px solid var(--line)}
.btn-ghost:hover{background:#e9edf3}
.calc-err{display:none;margin-top:12px;background:#fdecec;border:1px solid #f6c6c6;
  color:#a01b1b;padding:11px 14px;border-radius:var(--r-s);font-size:.92rem}
.calc-err.on{display:block}

/* ---------- Readout (deska rozdzielcza / komputer pokładowy) ---------- */
.readout{display:none;margin-top:18px;background:var(--panel);border-radius:var(--r);
  padding:clamp(16px,3vw,22px);color:#e9eef5;box-shadow:inset 0 0 0 1px #222a36}
.readout.on{display:block;animation:rise .25s ease}
@keyframes rise{from{opacity:0;transform:translateY(6px)}to{opacity:1;transform:none}}
.readout .hero-num{font-family:var(--f-mono);font-size:clamp(2.2rem,9vw,3.4rem);
  font-weight:700;color:var(--fuel);line-height:1;letter-spacing:-.02em}
.readout .hero-lab{font-size:.85rem;color:#9aa6b4;text-transform:uppercase;letter-spacing:.1em;margin-top:6px}
.readgrid{display:grid;gap:12px;grid-template-columns:1fr 1fr;margin-top:18px}
@media(min-width:560px){.readgrid{grid-template-columns:repeat(3,1fr)}}
.rstat{background:var(--panel-2);border-radius:10px;padding:12px 14px}
.rstat .v{font-family:var(--f-mono);font-size:1.3rem;font-weight:700;color:#fff;line-height:1.1}
.rstat .v.green{color:#43d98a}.rstat .v.orange{color:var(--fuel)}
.rstat .k{font-size:.76rem;color:#9aa6b4;margin-top:3px;letter-spacing:.03em}
.readnote{margin-top:14px;font-size:.84rem;color:#aeb8c4}
.readextra{margin-top:16px}
.readextra .amort{width:100%;border-collapse:collapse;font-size:.86rem;margin-top:6px}
.readextra .amort caption{text-align:left;color:#9aa6b4;font-size:.8rem;padding-bottom:6px;letter-spacing:.03em}
.readextra .amort th,.readextra .amort td{border:1px solid #2a3340;padding:7px 10px;text-align:right;color:#e9eef5}
.readextra .amort th{background:#1c222c;font-family:var(--f-disp);font-weight:600;text-align:right}
.readextra .amort th:first-child,.readextra .amort td:first-child{text-align:left;font-family:var(--f-mono)}
.readextra .amort td{font-family:var(--f-mono)}
.splitbar{display:flex;height:18px;border-radius:9px;overflow:hidden;margin:2px 0 8px;background:#222a36}
.splitbar span{display:block;height:100%}
.splitleg{display:flex;gap:16px;flex-wrap:wrap;font-size:.82rem;color:#cdd5e0;margin-bottom:6px}
.splitleg i{display:inline-block;width:11px;height:11px;border-radius:3px;margin-right:6px;vertical-align:-1px}
.share-row{display:flex;gap:8px;flex-wrap:wrap;margin-top:16px}
.share-row button{appearance:none;cursor:pointer;background:var(--panel-2);color:#cdd5e0;
  border:1px solid #2a3340;border-radius:8px;padding:9px 14px;font-size:.86rem;font-weight:600;
  font-family:var(--f-body)}
.share-row button:hover{background:#2a3340;color:#fff}

/* ---------- Reklamy (AdSense placeholder) ---------- */
.ad{margin:22px 0;min-height:90px;display:flex;align-items:center;justify-content:center;
  background:repeating-linear-gradient(45deg,#eef1f5,#eef1f5 10px,#e9edf3 10px,#e9edf3 20px);
  border:1px dashed #cfd6df;border-radius:12px;color:#9aa3ae;font-size:.78rem;
  letter-spacing:.06em;text-transform:uppercase}
.ad-inarticle{min-height:110px}

/* ---------- Treść ---------- */
.content{background:var(--surface);border:1px solid var(--line);border-radius:var(--r);
  box-shadow:var(--shadow);padding:clamp(20px,4vw,40px);margin:18px 0}
.content :where(h2,h3):first-child{margin-top:0}
.content table{width:100%;border-collapse:collapse;margin:1em 0;font-size:.94rem}
.content th,.content td{border:1px solid var(--line);padding:9px 12px;text-align:left}
.content th{background:var(--surface-2);font-family:var(--f-disp);font-weight:600}
.callout{background:#eef4ff;border:1px solid #cfe0ff;border-left:4px solid var(--brand);
  padding:14px 16px;border-radius:10px;margin:1.2em 0}
.callout.warn{background:#fff7e6;border-color:#ffe2a8;border-left-color:var(--warn)}
.callout strong{font-family:var(--f-disp)}

/* ---------- FAQ ---------- */
.faq details{border:1px solid var(--line);border-radius:var(--r-s);margin:10px 0;background:#fff;
  overflow:hidden}
.faq summary{cursor:pointer;list-style:none;padding:15px 18px;font-family:var(--f-disp);
  font-weight:600;font-size:1.02rem;display:flex;justify-content:space-between;gap:12px;align-items:center}
.faq summary::-webkit-details-marker{display:none}
.faq summary::after{content:"+";font-size:1.4rem;color:var(--fuel);line-height:1}
.faq details[open] summary::after{content:"–"}
.faq .a{padding:0 18px 16px;color:var(--ink)}

/* ---------- Powiązane / kafelki ---------- */
.tiles{display:grid;gap:14px;grid-template-columns:1fr;margin:8px 0}
@media(min-width:560px){.tiles{grid-template-columns:1fr 1fr}}
@media(min-width:900px){.tiles{grid-template-columns:1fr 1fr 1fr}}
.tile{display:block;background:#fff;border:1px solid var(--line);border-radius:var(--r);
  padding:18px;box-shadow:var(--shadow);transition:transform .12s,box-shadow .12s}
.tile:hover{transform:translateY(-2px);box-shadow:var(--shadow-lg);text-decoration:none}
.tile .ic{width:34px;height:34px;color:var(--fuel);margin-bottom:8px}
.tile h3{margin:0 0 4px;font-size:1.05rem}
.tile p{margin:0;color:var(--ink-2);font-size:.9rem}

/* ---------- Historia (localStorage) ---------- */
.history{margin:18px 0}
.history ul{list-style:none;padding:0;margin:8px 0 0;display:grid;gap:8px}
.history li{background:#fff;border:1px solid var(--line);border-radius:10px;padding:11px 14px;
  font-size:.9rem;display:flex;justify-content:space-between;gap:12px;align-items:center}
.history .t{color:var(--ink-2);font-size:.8rem;font-family:var(--f-mono);white-space:nowrap}
.history .empty{color:var(--ink-2);font-size:.9rem}
.history button.clr{background:none;border:0;color:var(--brand);cursor:pointer;font-size:.85rem}

/* ---------- Sekcja / nagłówki sekcji ---------- */
.sec{margin:30px 0}
.sec-h{display:flex;align-items:baseline;gap:12px;flex-wrap:wrap}
.feedback .fb{background:#fff;border:1px solid var(--line);border-radius:var(--r);padding:18px;
  box-shadow:var(--shadow)}
.feedback .fb-ic{color:var(--fuel);margin-bottom:6px}
.feedback .fb-ic .ic{width:30px;height:30px}
.feedback .fb p{margin:.3em 0 0;color:var(--ink-2);font-size:.92rem}
.feedback .who{font-family:var(--f-disp);font-weight:600;font-size:1.02rem}

/* ---------- Footer ---------- */
.foot{background:var(--panel);color:#aeb8c4;margin-top:40px;padding:38px 0 0}
.foot a{color:#cdd5e0}
.foot-grid{display:grid;gap:26px;grid-template-columns:1fr;padding-bottom:26px}
@media(min-width:680px){.foot-grid{grid-template-columns:1.4fr 1fr 1fr}}
.foot h4{color:#fff;font-size:1rem;margin:0 0 12px}
.foot ul{list-style:none;padding:0;margin:0}
.foot li{margin:7px 0;font-size:.9rem}
.foot .desc{font-size:.9rem;max-width:42ch}
.foot-bottom{border-top:1px solid #222a36;padding:16px 0;font-size:.83rem;
  display:flex;justify-content:space-between;flex-wrap:wrap;gap:10px}

/* ---------- Cookie ---------- */
.cookie{position:fixed;left:14px;right:14px;bottom:14px;background:var(--panel);color:#e9eef5;
  border:1px solid #2a3340;border-radius:14px;padding:16px 18px;box-shadow:var(--shadow-lg);
  z-index:80;display:none;gap:14px;align-items:center;flex-wrap:wrap;max-width:760px;margin:0 auto}
.cookie.on{display:flex}
.cookie p{margin:0;font-size:.88rem;flex:1 1 240px}
.cookie .btn{padding:9px 16px;font-size:.9rem}

/* ---------- 404 ---------- */
.e404{text-align:center;padding:60px 0 20px}
.e404 .code{font-family:var(--f-mono);font-size:clamp(4rem,18vw,8rem);font-weight:700;
  color:var(--fuel);line-height:1}

@media (prefers-reduced-motion: reduce){*{animation:none!important;transition:none!important}}