/* ==========================================================================
   SuperPrzelicznik — arkusz stylów (mobile-first, instrument/gauge)
   Brak zewnętrznych fontów = szybkie ładowanie. Jednostki viewport + rem.
   ========================================================================== */

:root{
  /* paleta: atrament + sygnał (zieleń wyniku) + chłodne szarości + bursztyn */
  --ink:#14243a;          /* nagłówki, tekst główny */
  --ink-soft:#2b3c54;
  --muted:#5b6b7f;        /* tekst drugorzędny */
  --paper:#f5f8fb;        /* tło strony (chłodna biel, nie krem) */
  --surface:#ffffff;      /* karty */
  --surface-2:#eef3f8;
  --line:#dce5ee;         /* włoskowate obramowania */
  --line-strong:#c3d1de;
  --accent:#0e7c66;       /* zieleń „wynik / wykonaj” */
  --accent-bright:#15a07f;
  --accent-soft:#e3f4ef;
  --mark:#e08a1e;         /* bursztyn — akcent na liczbie wyniku */
  --readout-bg:#0f2236;   /* ciemny panel odczytu (gauge) */
  --readout-fg:#7ff0cf;
  --danger:#c0392b;
  --radius:14px;
  --radius-sm:9px;
  --shadow:0 1px 2px rgba(20,36,58,.06),0 8px 24px -12px rgba(20,36,58,.18);
  --shadow-sm:0 1px 2px rgba(20,36,58,.08);
  --maxw:1080px;
  --sans:system-ui,-apple-system,"Segoe UI",Roboto,"Helvetica Neue",Arial,
         "Noto Sans","Liberation Sans",sans-serif;
  --mono:ui-monospace,"SF Mono","Cascadia Mono","Roboto Mono",
         "DejaVu Sans Mono",Consolas,monospace;
}

*,*::before,*::after{box-sizing:border-box}
html{-webkit-text-size-adjust:100%;text-size-adjust:100%;scroll-behavior:smooth}
body{
  margin:0;font-family:var(--sans);color:var(--ink-soft);background:var(--paper);
  font-size:clamp(15px,2.6vw,16.5px);line-height:1.62;
  -webkit-font-smoothing:antialiased;text-rendering:optimizeLegibility;
  overflow-wrap:break-word;
}
img{max-width:100%;height:auto;display:block}
a{color:var(--accent);text-decoration:none}
a:hover{text-decoration:underline}
:focus-visible{outline:3px solid var(--accent-bright);outline-offset:2px;border-radius:4px}

.container{width:100%;max-width:var(--maxw);margin-inline:auto;padding-inline:clamp(14px,4vw,28px)}

/* ---------- nagłówki / typografia ---------- */
h1,h2,h3,h4,h5,h6{color:var(--ink);line-height:1.2;font-weight:750;margin:0 0 .5em}
h1{font-size:clamp(1.55rem,5.2vw,2.35rem);letter-spacing:-.02em}
h2{font-size:clamp(1.25rem,4vw,1.6rem);letter-spacing:-.015em;margin-top:2.2rem}
h3{font-size:clamp(1.08rem,3.2vw,1.25rem);margin-top:1.6rem}
h4{font-size:1.02rem;margin-top:1.2rem}
h5{font-size:.95rem}
h6{font-size:.85rem;text-transform:uppercase;letter-spacing:.06em;color:var(--muted)}
p{margin:0 0 1rem}
strong{color:var(--ink);font-weight:680}
.lead{font-size:clamp(1.02rem,2.9vw,1.18rem);color:var(--ink-soft)}

/* ---------- skip link ---------- */
.skip{position:absolute;left:-999px;top:0;background:var(--ink);color:#fff;
  padding:.6rem 1rem;border-radius:0 0 8px 0;z-index:1000}
.skip:focus{left:0}

/* ---------- header ---------- */
.site-header{position:sticky;top:0;z-index:50;background:rgba(245,248,251,.92);
  backdrop-filter:saturate(1.4) blur(8px);border-bottom:1px solid var(--line)}
.header-bar{display:flex;align-items:center;gap:1rem;min-height:60px}
.brand{display:flex;align-items:center;gap:.55rem;font-weight:800;color:var(--ink);
  font-size:1.12rem;letter-spacing:-.02em;white-space:nowrap}
.brand:hover{text-decoration:none}
.brand .logo{width:30px;height:30px;flex:0 0 auto}
.brand b{color:var(--accent)}
.nav-toggle{margin-left:auto;display:inline-flex;align-items:center;gap:.4rem;
  background:var(--surface);border:1px solid var(--line-strong);color:var(--ink);
  padding:.5rem .7rem;border-radius:9px;font:inherit;font-weight:600;cursor:pointer}
.nav-toggle svg{width:18px;height:18px}
.main-nav{margin-left:auto}
.main-nav ul{list-style:none;display:flex;gap:.3rem;margin:0;padding:0;flex-wrap:wrap}
.main-nav a{display:block;padding:.5rem .7rem;border-radius:8px;color:var(--ink-soft);
  font-weight:600;font-size:.95rem}
.main-nav a:hover{background:var(--surface-2);text-decoration:none;color:var(--ink)}
.main-nav a[aria-current="page"]{color:var(--accent);background:var(--accent-soft)}

/* nawigacja mobilna: ukryta lista rozwijana bez JS (details) */
.nav-mobile{position:relative;margin-left:auto}
.nav-mobile>summary{list-style:none;display:inline-flex;align-items:center;gap:.4rem;
  background:var(--surface);border:1px solid var(--line-strong);color:var(--ink);
  padding:.5rem .75rem;border-radius:9px;font-weight:650;cursor:pointer;user-select:none}
.nav-mobile>summary::-webkit-details-marker{display:none}
.nav-mobile>summary svg{width:18px;height:18px}
.nav-mobile[open]>summary{background:var(--accent-soft);border-color:var(--accent)}
.nav-mobile .nav-panel{position:absolute;right:0;top:calc(100% + 8px);min-width:240px;
  background:var(--surface);border:1px solid var(--line);border-radius:12px;
  box-shadow:var(--shadow);padding:.5rem;z-index:60}
.nav-mobile .nav-panel a{display:block;padding:.6rem .7rem;border-radius:8px;
  color:var(--ink-soft);font-weight:600}
.nav-mobile .nav-panel a:hover{background:var(--surface-2);text-decoration:none}

/* ---------- reklamy (placeholdery AdSense) ---------- */
.ad-slot{margin:1.4rem auto;min-height:90px;display:flex;align-items:center;
  justify-content:center;background:repeating-linear-gradient(45deg,#eef3f8,#eef3f8 10px,#e9eff5 10px,#e9eff5 20px);
  border:1px dashed var(--line-strong);border-radius:10px;color:#9aabbd;
  font-size:.75rem;letter-spacing:.08em;text-transform:uppercase;max-width:100%}
.ad-slot[data-format="horizontal"]{min-height:90px}
.ad-slot[data-format="rectangle"]{min-height:250px;max-width:336px}
.ad-slot[data-format="leaderboard"]{min-height:90px}

/* ---------- układ treści ---------- */
main{display:block}
.page{padding-block:clamp(1rem,3vw,1.6rem) clamp(2rem,6vw,3.5rem)}
.layout{display:grid;gap:clamp(1.5rem,4vw,2.4rem)}
@media(min-width:960px){
  .layout.with-aside{grid-template-columns:minmax(0,1fr) 300px;align-items:start}
  .aside{position:sticky;top:76px}
}
.prose{max-width:72ch}
.prose h2,.prose h3{scroll-margin-top:80px}
.prose ul,.prose ol{margin:0 0 1rem;padding-left:1.3rem}
.prose li{margin:.3rem 0}
.prose ul.clean{list-style:none;padding-left:0}
.prose ul.clean li{padding-left:1.6rem;position:relative}
.prose ul.clean li::before{content:"";position:absolute;left:.1rem;top:.62em;
  width:.5rem;height:.5rem;background:var(--accent);border-radius:2px;transform:rotate(45deg)}

/* ---------- hero ---------- */
.hero{padding-top:clamp(1.2rem,4vw,2rem)}
.hero .eyebrow{display:inline-flex;align-items:center;gap:.5rem;font-size:.78rem;
  font-weight:700;letter-spacing:.05em;text-transform:uppercase;color:var(--accent);
  background:var(--accent-soft);padding:.32rem .7rem;border-radius:999px;margin-bottom:.9rem}
.hero p.lead{max-width:60ch}

/* ---------- KONWERTER (instrument) ---------- */
.tool{background:var(--surface);border:1px solid var(--line);border-radius:var(--radius);
  box-shadow:var(--shadow);padding:clamp(1rem,3.5vw,1.6rem);margin-block:1.4rem}
.tool-head{display:flex;align-items:center;gap:.6rem;margin-bottom:1rem}
.tool-head .pill{font-size:.72rem;font-weight:700;text-transform:uppercase;
  letter-spacing:.06em;color:var(--accent);background:var(--accent-soft);
  padding:.28rem .6rem;border-radius:999px}
.tool-head h2,.tool-head .as-h2{margin:0;font-size:clamp(1.1rem,3.4vw,1.35rem)}

.conv-grid{display:grid;gap:.7rem}
.conv-field{display:grid;gap:.35rem}
.conv-field label{font-size:.82rem;font-weight:650;color:var(--muted)}
.conv-row{display:grid;grid-template-columns:1fr auto;gap:.5rem}
.conv-input{font-family:var(--mono);font-size:clamp(1.3rem,5vw,1.7rem);font-weight:600;
  color:var(--ink);background:var(--surface-2);border:1.5px solid var(--line-strong);
  border-radius:var(--radius-sm);padding:.6rem .8rem;width:100%;
  font-variant-numeric:tabular-nums;-moz-appearance:textfield}
.conv-input::-webkit-outer-spin-button,.conv-input::-webkit-inner-spin-button{-webkit-appearance:none;margin:0}
.conv-input:focus{outline:none;border-color:var(--accent);background:#fff;
  box-shadow:0 0 0 3px var(--accent-soft)}
.conv-select{font:inherit;font-weight:650;color:var(--ink);background:var(--surface);
  border:1.5px solid var(--line-strong);border-radius:var(--radius-sm);
  padding:.5rem 2rem .5rem .7rem;min-width:7.5rem;cursor:pointer;
  background-image:url("data:image/svg+xml,%3Csvg xmlns='http://www.w3.org/2000/svg' viewBox='0 0 12 12'%3E%3Cpath d='M3 4.5 6 8l3-3.5' fill='none' stroke='%235b6b7f' stroke-width='1.6' stroke-linecap='round'/%3E%3C/svg%3E");
  background-repeat:no-repeat;background-position:right .6rem center;background-size:14px;
  -webkit-appearance:none;appearance:none}

.swap{display:flex;justify-content:center;margin:.1rem 0}
.swap button{display:inline-flex;align-items:center;justify-content:center;gap:.4rem;
  width:46px;height:46px;border-radius:50%;background:var(--surface);
  border:1.5px solid var(--line-strong);color:var(--accent);cursor:pointer;
  transition:transform .18s ease,border-color .18s ease,background .18s ease}
.swap button:hover{border-color:var(--accent);background:var(--accent-soft)}
.swap button:active{transform:rotate(180deg) scale(.94)}
.swap button svg{width:20px;height:20px}

/* panel odczytu (gauge readout) — element sygnaturowy */
.readout{margin-top:1rem;background:var(--readout-bg);border-radius:var(--radius-sm);
  padding:1rem 1.1rem;color:#cfe6f5;
  background-image:radial-gradient(120% 120% at 0% 0%,rgba(127,240,207,.10),transparent 60%)}
.readout .readout-label{font-size:.72rem;text-transform:uppercase;letter-spacing:.1em;
  color:#7a93a8;margin-bottom:.25rem}
.readout .readout-value{font-family:var(--mono);font-variant-numeric:tabular-nums;
  font-size:clamp(1.6rem,7vw,2.4rem);font-weight:600;color:var(--readout-fg);
  line-height:1.1;word-break:break-all}
.readout .readout-value .unit{color:#cfe6f5;font-size:.55em;font-weight:500;margin-left:.3em}
.readout .readout-formula{margin-top:.5rem;font-family:var(--mono);font-size:.8rem;
  color:#9fb6c8}

.conv-actions{display:flex;flex-wrap:wrap;gap:.5rem;margin-top:.9rem}
.btn{display:inline-flex;align-items:center;gap:.45rem;font:inherit;font-weight:650;
  border-radius:9px;padding:.55rem .9rem;cursor:pointer;border:1.5px solid transparent;
  background:var(--surface-2);color:var(--ink-soft)}
.btn svg{width:16px;height:16px}
.btn:hover{background:var(--surface);border-color:var(--line-strong);text-decoration:none}
.btn-primary{background:var(--accent);color:#fff;border-color:var(--accent)}
.btn-primary:hover{background:var(--accent-bright);border-color:var(--accent-bright);color:#fff}
.btn-ghost{background:transparent}
.copied{color:var(--accent);font-size:.85rem;font-weight:650;align-self:center}

/* uniwersalny konwerter — zakładki kategorii */
.cat-tabs{display:flex;gap:.4rem;flex-wrap:wrap;margin-bottom:1rem}
.cat-tabs button{font:inherit;font-weight:650;font-size:.9rem;border:1.5px solid var(--line-strong);
  background:var(--surface);color:var(--ink-soft);border-radius:999px;padding:.42rem .85rem;cursor:pointer}
.cat-tabs button[aria-selected="true"]{background:var(--ink);color:#fff;border-color:var(--ink)}
.uni-out{display:grid;gap:.5rem;grid-template-columns:1fr;margin-top:1rem}
@media(min-width:560px){.uni-out{grid-template-columns:1fr 1fr}}
.uni-cell{display:flex;justify-content:space-between;align-items:baseline;gap:.6rem;
  background:var(--surface-2);border:1px solid var(--line);border-radius:9px;padding:.6rem .8rem}
.uni-cell .u-name{font-size:.82rem;color:var(--muted);font-weight:600}
.uni-cell .u-val{font-family:var(--mono);font-variant-numeric:tabular-nums;font-weight:600;
  color:var(--ink);font-size:1.02rem}

/* historia */
.history{margin-top:1rem;border-top:1px dashed var(--line-strong);padding-top:.8rem}
.history h3,.history .as-h3{font-size:.9rem;margin:0 0 .5rem;color:var(--muted);
  text-transform:uppercase;letter-spacing:.05em}
.history ul{list-style:none;margin:0;padding:0;display:grid;gap:.35rem}
.history li{display:flex;justify-content:space-between;gap:.6rem;font-family:var(--mono);
  font-size:.85rem;background:var(--surface-2);border-radius:7px;padding:.4rem .6rem;color:var(--ink-soft)}
.history .empty{font-family:var(--sans);color:var(--muted);font-size:.85rem;font-style:italic}
.history .clear{margin-top:.5rem;font-size:.82rem;color:var(--danger);background:none;
  border:none;cursor:pointer;font-weight:650;padding:0}

/* ---------- tabela referencyjna ---------- */
.table-wrap{overflow-x:auto;border:1px solid var(--line);border-radius:10px;margin:1rem 0}
table.ref{width:100%;border-collapse:collapse;font-size:.92rem;min-width:320px}
table.ref caption{text-align:left;padding:.6rem .8rem;font-weight:650;color:var(--muted);
  font-size:.85rem;background:var(--surface-2)}
table.ref th,table.ref td{padding:.55rem .8rem;text-align:right;border-bottom:1px solid var(--line)}
table.ref th:first-child,table.ref td:first-child{text-align:left}
table.ref thead th{background:var(--surface-2);color:var(--ink);font-weight:700;
  position:sticky;top:0}
table.ref tbody tr:nth-child(even){background:#fafcfe}
table.ref td.num{font-family:var(--mono);font-variant-numeric:tabular-nums}

/* ---------- karty kategorii / siatka narzędzi ---------- */
.grid{display:grid;gap:.8rem;grid-template-columns:repeat(auto-fill,minmax(min(100%,230px),1fr))}
.card{display:flex;flex-direction:column;gap:.3rem;background:var(--surface);
  border:1px solid var(--line);border-radius:12px;padding:1rem;box-shadow:var(--shadow-sm);
  transition:border-color .15s ease,transform .15s ease,box-shadow .15s ease}
.card:hover{border-color:var(--accent);transform:translateY(-2px);box-shadow:var(--shadow);text-decoration:none}
.card .ic{width:34px;height:34px;display:grid;place-items:center;background:var(--accent-soft);
  border-radius:9px;margin-bottom:.3rem}
.card .ic svg{width:20px;height:20px;color:var(--accent)}
.card .t{font-weight:700;color:var(--ink);font-size:1.02rem}
.card .d{font-size:.86rem;color:var(--muted)}
.card .count{margin-top:auto;padding-top:.4rem;font-size:.78rem;color:var(--accent);font-weight:650}

.tool-list{display:grid;gap:.5rem;grid-template-columns:repeat(auto-fill,minmax(min(100%,250px),1fr));list-style:none;padding:0;margin:1rem 0}
.tool-list a{display:flex;align-items:center;gap:.5rem;background:var(--surface);
  border:1px solid var(--line);border-radius:9px;padding:.65rem .8rem;color:var(--ink-soft);
  font-weight:600;font-size:.95rem}
.tool-list a:hover{border-color:var(--accent);color:var(--ink);text-decoration:none;background:#fff}
.tool-list a::before{content:"→";color:var(--accent);font-weight:800}

/* ---------- breadcrumb ---------- */
.breadcrumb{font-size:.84rem;color:var(--muted);padding:.4rem 0}
.breadcrumb ol{list-style:none;display:flex;flex-wrap:wrap;gap:.3rem;margin:0;padding:0}
.breadcrumb li::after{content:"/";margin-left:.3rem;color:var(--line-strong)}
.breadcrumb li:last-child::after{content:""}
.breadcrumb a{color:var(--muted)}
.breadcrumb a:hover{color:var(--accent)}
.breadcrumb [aria-current]{color:var(--ink-soft);font-weight:600}

/* ---------- FAQ ---------- */
.faq{margin-top:1.5rem}
.faq details{background:var(--surface);border:1px solid var(--line);border-radius:10px;
  margin-bottom:.6rem;overflow:hidden}
.faq summary{cursor:pointer;font-weight:680;color:var(--ink);padding:.85rem 1rem;
  list-style:none;display:flex;justify-content:space-between;align-items:center;gap:1rem}
.faq summary::-webkit-details-marker{display:none}
.faq summary::after{content:"+";font-size:1.3rem;color:var(--accent);font-weight:600;
  transition:transform .2s ease}
.faq details[open] summary::after{transform:rotate(45deg)}
.faq .faq-body{padding:0 1rem 1rem;color:var(--ink-soft)}
.faq .faq-body p:last-child{margin-bottom:0}

/* ---------- info / callout ---------- */
.callout{background:var(--accent-soft);border-left:4px solid var(--accent);
  border-radius:8px;padding:.85rem 1rem;margin:1rem 0;font-size:.95rem}
.callout.warn{background:#fdf3e6;border-left-color:var(--mark)}
.callout .ttl{font-weight:700;color:var(--ink);display:block;margin-bottom:.2rem}

.feedback{display:grid;gap:.8rem;grid-template-columns:repeat(auto-fit,minmax(min(100%,260px),1fr));margin:1rem 0}
.feedback figure{margin:0;background:var(--surface);border:1px solid var(--line);
  border-radius:11px;padding:1rem}
.feedback blockquote{margin:0 0 .6rem;color:var(--ink-soft)}
.feedback figcaption{font-size:.85rem;color:var(--muted);font-weight:600}
.stars{color:var(--mark);letter-spacing:.1em;font-size:.9rem;margin-bottom:.4rem}

/* ---------- footer ---------- */
.site-footer{background:var(--ink);color:#b9c8d8;margin-top:3rem;
  padding-block:clamp(2rem,5vw,3rem) 1.4rem}
.site-footer a{color:#d6e2ee}
.site-footer a:hover{color:#fff}
.footer-grid{display:grid;gap:1.6rem;grid-template-columns:repeat(auto-fit,minmax(min(100%,200px),1fr))}
.footer-brand .logo{width:30px;height:30px}
.footer-brand .bn{display:flex;align-items:center;gap:.5rem;color:#fff;font-weight:800;
  font-size:1.1rem;margin-bottom:.6rem}
.footer-brand p{font-size:.9rem;color:#9fb2c4;max-width:32ch}
.site-footer h3{color:#fff;font-size:.82rem;text-transform:uppercase;letter-spacing:.07em;
  margin:0 0 .8rem}
.site-footer ul{list-style:none;margin:0;padding:0;display:grid;gap:.45rem;font-size:.92rem}
.footer-bottom{border-top:1px solid #28415c;margin-top:2rem;padding-top:1.2rem;
  display:flex;flex-wrap:wrap;gap:.6rem 1.4rem;align-items:center;justify-content:space-between;
  font-size:.82rem;color:#8ea3b8}
.footer-bottom .legal{display:flex;flex-wrap:wrap;gap:1rem}

/* ---------- cookies ---------- */
.cookie-bar{position:fixed;left:1rem;right:1rem;bottom:1rem;z-index:200;max-width:760px;
  margin-inline:auto;background:var(--ink);color:#dfe9f2;border-radius:14px;
  box-shadow:0 12px 40px -12px rgba(0,0,0,.5);padding:1rem 1.1rem;
  display:flex;flex-wrap:wrap;gap:.8rem;align-items:center}
.cookie-bar p{margin:0;font-size:.88rem;flex:1 1 280px;color:#cdd9e6}
.cookie-bar a{color:#7ff0cf}
.cookie-bar .cb-actions{display:flex;gap:.5rem;flex:0 0 auto}
.cookie-bar.hidden{display:none}

/* ---------- 404 ---------- */
.err{text-align:center;padding-block:clamp(2.5rem,8vw,5rem)}
.err .code{font-family:var(--mono);font-size:clamp(3.5rem,16vw,7rem);font-weight:700;
  color:var(--accent);line-height:1;letter-spacing:-.03em}
.err h1{margin-top:.6rem}

/* ---------- pomocnicze ---------- */
.muted{color:var(--muted)}
.center{text-align:center}
.mt0{margin-top:0}
.section-label{display:inline-block;font-size:.78rem;font-weight:700;text-transform:uppercase;
  letter-spacing:.07em;color:var(--accent);margin-bottom:.3rem}
.divider{border:none;border-top:1px solid var(--line);margin:2rem 0}
.tags{display:flex;flex-wrap:wrap;gap:.4rem;margin:.8rem 0}
.tags a{font-size:.82rem;background:var(--surface-2);border:1px solid var(--line);
  color:var(--ink-soft);padding:.3rem .65rem;border-radius:999px;font-weight:600}
.tags a:hover{border-color:var(--accent);color:var(--accent);text-decoration:none}

@media (prefers-reduced-motion:reduce){
  *{animation-duration:.001ms!important;transition-duration:.001ms!important;scroll-behavior:auto!important}
}
@media print{
  .site-header,.site-footer,.ad-slot,.conv-actions,.cookie-bar,.nav-mobile{display:none!important}
  body{background:#fff}
}

/* ---------- przełączanie nawigacji desktop / mobile ---------- */
.main-nav{display:none}
.nav-mobile{display:block}
@media(min-width:880px){
  .main-nav{display:block}
  .nav-mobile{display:none}
}

/* ---------- kalkulatory formularzowe ---------- */
.form-grid{display:grid;gap:.7rem;grid-template-columns:1fr}
@media(min-width:520px){.form-grid{grid-template-columns:1fr 1fr}}
.form-grid .conv-field{gap:.3rem}
.form-grid .conv-input{font-size:clamp(1.1rem,4vw,1.35rem)}
.calc-rows{margin-top:.9rem}
.calc-rows .uni-cell .u-val{font-size:.98rem}