/* =========================================================
   warsztatklimatyzacji.pl — system designu
   Utylitarny, gęsty, "branżowy". Bez zaokrąglonych bąbli.
   ========================================================= */

:root {
  --paper:      #f4f4f1;
  --surface:    #ffffff;
  --surface-2:  #ecedea;
  --ink:        #14181c;
  --ink-2:      #3c454e;
  --muted:      #6b7580;
  --line:       #d6dade;
  --line-hard:  #b4bcc4;

  --accent:     #0b5488;
  --accent-ink: #ffffff;
  --accent-bg:  #e7f0f8;

  --warn:       #a35c00;
  --warn-bg:    #fdf3e2;
  --danger:     #a81f1f;
  --danger-bg:  #fbeceb;
  --ok:         #146b3a;
  --ok-bg:      #e8f4ec;

  --sans: ui-sans-serif, -apple-system, "Segoe UI", Inter, Roboto, "Helvetica Neue", Arial, sans-serif;
  --mono: ui-monospace, SFMono-Regular, "SF Mono", Menlo, Consolas, "Liberation Mono", monospace;

  --wrap: 1180px;
  --r: 3px;
}

* { box-sizing: border-box; }
html { -webkit-text-size-adjust: 100%; scroll-behavior: smooth; }
body {
  margin: 0;
  background: var(--paper);
  color: var(--ink);
  font-family: var(--sans);
  font-size: 16.5px;
  line-height: 1.62;
  text-rendering: optimizeLegibility;
}
img { max-width: 100%; height: auto; display: block; }

.wrap { max-width: var(--wrap); margin: 0 auto; padding: 0 20px; }
.wrap-narrow { max-width: 760px; margin: 0 auto; padding: 0 20px; }

/* ---------- Typografia ---------- */
h1, h2, h3, h4 { line-height: 1.2; margin: 0 0 .5em; font-weight: 660; letter-spacing: -.015em; }
h1 { font-size: clamp(1.9rem, 1.3rem + 2.4vw, 3rem); }
h2 { font-size: clamp(1.35rem, 1.1rem + 1.1vw, 1.85rem); margin-top: 2.4em; }
h3 { font-size: 1.14rem; margin-top: 2em; }
h4 { font-size: 1rem; margin-top: 1.6em; }
p { margin: 0 0 1.05em; }
a { color: var(--accent); text-decoration-thickness: 1px; text-underline-offset: 2px; }
a:hover { text-decoration-thickness: 2px; }
small { font-size: .82rem; }
strong { font-weight: 660; }
hr { border: 0; border-top: 1px solid var(--line); margin: 2.4rem 0; }

.kicker {
  font: 600 .715rem/1.3 var(--mono);
  letter-spacing: .13em;
  text-transform: uppercase;
  color: var(--accent);
  margin: 0 0 .55rem;
  display: block;
}
.kicker.muted { color: var(--muted); }
.lede { font-size: 1.15rem; color: var(--ink-2); line-height: 1.56; }
.byline { font: .8rem/1.5 var(--mono); color: var(--muted); }
.mono { font-family: var(--mono); font-variant-numeric: tabular-nums; }

/* ---------- Nagłówek ---------- */
.top {
  position: sticky; top: 0; z-index: 50;
  background: color-mix(in srgb, var(--surface) 92%, transparent);
  backdrop-filter: saturate(1.4) blur(8px);
  border-bottom: 1px solid var(--line);
}
.top-in { display: flex; align-items: center; gap: 18px; height: 60px; }
.brand { display: flex; align-items: baseline; gap: 9px; text-decoration: none; color: var(--ink); flex: none; }
.brand b { font-size: 1.02rem; font-weight: 720; letter-spacing: -.02em; }
.brand span { font: 600 .62rem/1 var(--mono); letter-spacing: .14em; text-transform: uppercase; color: var(--muted); }
.brand-mark {
  width: 23px; height: 23px; flex: none; align-self: center;
  color: var(--accent);
}

.nav { display: flex; gap: 2px; margin-left: auto; flex-wrap: wrap; }
.nav a {
  font-size: .875rem; font-weight: 550; color: var(--ink-2); text-decoration: none;
  padding: 6px 10px; border-radius: var(--r); white-space: nowrap;
}
.nav a:hover { background: var(--surface-2); color: var(--ink); }
.nav a[aria-current="page"] { color: var(--accent); background: var(--accent-bg); }

.btn {
  display: inline-block; padding: 8px 14px; font: 550 .85rem var(--sans);
  background: var(--surface); border: 1px solid var(--line-hard); border-radius: var(--r);
  color: var(--ink-2); cursor: pointer;
}
.btn:hover { border-color: var(--accent); color: var(--accent); }
.burger { display: none; }

@media (max-width: 940px) {
  .burger {
    display: grid; place-items: center; margin-left: auto; flex: none;
    width: 34px; height: 32px; background: none; cursor: pointer;
    border: 1px solid var(--line); border-radius: var(--r); color: var(--ink);
  }
  .top-in { gap: 10px; }
  .brand { min-width: 0; overflow: hidden; }
  .nav {
    display: none; position: absolute; top: 60px; left: 0; right: 0;
    flex-direction: column; gap: 0; margin: 0; padding: 6px;
    background: var(--surface); border-bottom: 1px solid var(--line);
    box-shadow: 0 12px 24px rgba(0,0,0,.12);
  }
  .nav.open { display: flex; }
  .nav a { padding: 10px 12px; font-size: .95rem; }
}

/* ---------- Hero ---------- */
.hero { border-bottom: 1px solid var(--line); background: var(--surface); }
.hero-in { padding: 56px 0 44px; display: grid; grid-template-columns: 1.55fr 1fr; gap: 46px; align-items: start; }
@media (max-width: 860px) { .hero-in { grid-template-columns: 1fr; gap: 30px; padding: 36px 0 30px; } }
.hero h1 { margin-bottom: .35em; }
.hero .lede { max-width: 44ch; }
.hero-note {
  border-left: 3px solid var(--accent); padding: 2px 0 2px 15px;
  font-size: .95rem; color: var(--ink-2);
}

/* ---------- Pasek danych ---------- */
.datastrip {
  display: grid; grid-template-columns: repeat(4, 1fr);
  border: 1px solid var(--line); background: var(--surface); border-radius: var(--r);
  overflow: hidden;
}
.datastrip div { padding: 14px 16px; border-right: 1px solid var(--line); }
.datastrip div:last-child { border-right: 0; }
.datastrip b { display: block; font: 700 1.42rem/1.1 var(--mono); color: var(--ink); letter-spacing: -.02em; }
.datastrip span { display: block; font-size: .78rem; color: var(--muted); margin-top: 4px; line-height: 1.35; }
.hero .datastrip { grid-template-columns: repeat(2, 1fr); }
.hero .datastrip div:nth-child(2n) { border-right: 0; }
.hero .datastrip div:nth-child(-n+2) { border-bottom: 1px solid var(--line); }
.hero .datastrip b { font-size: 1.3rem; }

@media (max-width: 760px) {
  .datastrip { grid-template-columns: repeat(2, 1fr); }
  .datastrip div:nth-child(2n) { border-right: 0; }
  .datastrip div:nth-child(-n+2) { border-bottom: 1px solid var(--line); }
}

/* ---------- Sekcje / siatki ---------- */
section { padding: 56px 0; }
.sec-head { display: flex; align-items: end; justify-content: space-between; gap: 20px; margin-bottom: 22px; }
.sec-head h2 { margin: 0; }
.sec-head a { font-size: .87rem; font-weight: 550; white-space: nowrap; }

.grid { display: grid; gap: 16px; }
.g2 { grid-template-columns: repeat(2, 1fr); }
.g3 { grid-template-columns: repeat(3, 1fr); }
.g4 { grid-template-columns: repeat(4, 1fr); }
@media (max-width: 900px) { .g3, .g4 { grid-template-columns: repeat(2, 1fr); } }
@media (max-width: 620px) { .g2, .g3, .g4 { grid-template-columns: 1fr; } }

.card {
  background: var(--surface); border: 1px solid var(--line); border-radius: var(--r);
  padding: 18px 18px 20px; display: flex; flex-direction: column;
  text-decoration: none; color: inherit;
}
a.card:hover { border-color: var(--accent); }
.card h3 { margin: 0 0 .4em; font-size: 1.05rem; }
.card p { margin: 0; font-size: .9rem; color: var(--ink-2); }
.card .kicker { margin-bottom: .5rem; }
.card .meta { margin-top: auto; padding-top: 12px; font: .74rem/1 var(--mono); color: var(--muted); letter-spacing: .04em; }

/* Ścieżki startowe */
.path { background: var(--surface); border: 1px solid var(--line); border-left: 3px solid var(--accent); border-radius: var(--r); padding: 18px; }
.path h3 { margin: 0 0 .4em; font-size: 1.02rem; }
.path p { font-size: .9rem; color: var(--ink-2); margin: 0 0 .8em; }
.path ol { margin: 0; padding-left: 1.1em; font-size: .88rem; color: var(--ink-2); }
.path ol li { margin-bottom: .3em; }

/* Lista artykułów */
.feed { border-top: 1px solid var(--line); }
.feed a {
  display: grid; grid-template-columns: 96px 1fr auto; gap: 18px; align-items: baseline;
  padding: 15px 4px; border-bottom: 1px solid var(--line);
  text-decoration: none; color: inherit;
}
.feed a:hover { background: var(--surface); }
.feed .tag { font: 600 .68rem/1.6 var(--mono); letter-spacing: .1em; text-transform: uppercase; color: var(--accent); }
.feed .ttl { font-weight: 580; }
.feed .ttl em { display: block; font-style: normal; font-weight: 400; font-size: .87rem; color: var(--muted); margin-top: 2px; }
.feed .len { font: .74rem/1 var(--mono); color: var(--muted); white-space: nowrap; }
@media (max-width: 680px) {
  .feed a { grid-template-columns: 1fr; gap: 4px; }
  .feed .len { display: none; }
}

/* ---------- Treść artykułu ---------- */
.article { padding: 40px 0 70px; display: grid; grid-template-columns: 220px minmax(0,1fr); gap: 48px; align-items: start; }
@media (max-width: 1000px) { .article { grid-template-columns: 1fr; gap: 24px; } }
.toc { position: sticky; top: 78px; font-size: .86rem; }
@media (max-width: 1000px) {
  .toc { position: static; background: var(--surface); border: 1px solid var(--line); border-radius: var(--r); padding: 14px 16px; }
}
.toc b { display: block; font: 600 .68rem/1 var(--mono); letter-spacing: .13em; text-transform: uppercase; color: var(--muted); margin-bottom: 10px; }
.toc a { display: block; padding: 4px 0 4px 11px; border-left: 2px solid var(--line); color: var(--ink-2); text-decoration: none; }
.toc a:hover { border-left-color: var(--accent); color: var(--accent); }

/* Tekst trzyma 74ch dla czytelności; tabele biorą pełną szerokość kolumny. */
.prose { max-width: none; }
.prose > h2, .prose > h3, .prose > h4,
.prose > p, .prose > ul, .prose > ol,
.prose > .note, .prose > .steps, .prose > .check { max-width: 74ch; }
.prose > .tablewrap { max-width: 100%; }
.prose > h2:first-child { margin-top: 0; }
.prose ul, .prose ol { padding-left: 1.3em; margin: 0 0 1.15em; }
.prose li { margin-bottom: .42em; }
.prose li::marker { color: var(--muted); }

.page-head { border-bottom: 1px solid var(--line); background: var(--surface); padding: 40px 0 30px; }
.page-head h1 { max-width: 22ch; }
.page-head .lede { max-width: 62ch; margin-bottom: .8em; }

/* Pas ze zdjeciem pod naglowkiem strony: ma budowac rytm, nie odciagac uwagi */
.photoband { border-bottom: 1px solid var(--line); background: var(--surface-2); }
.photoband img {
  width: 100%; height: clamp(150px, 22vw, 260px); object-fit: cover;
  display: block; filter: saturate(.82) contrast(1.04);
}

/* Zdjecie w karcie dzialu */
.card-photo { padding: 0; overflow: hidden; }
.card-photo img { width: 100%; height: 132px; object-fit: cover; display: block; filter: saturate(.82); }
.card-photo .card-body { padding: 16px 18px 18px; display: flex; flex-direction: column; flex: 1; }
.card-photo h3 { margin: 0 0 .4em; font-size: 1.05rem; }
.card-photo p { margin: 0; font-size: .9rem; color: var(--ink-2); }
.card-photo .meta { margin-top: auto; padding-top: 12px; font: .74rem/1 var(--mono); color: var(--muted); letter-spacing: .04em; }

/* ---------- Infografika ---------- */
/* Numeracja sekcji artykułu: duży numer nad h2 */
.prose { counter-reset: sec; }
.prose > h2 { counter-increment: sec; padding-top: .35em; border-top: 2px solid var(--ink); }
.prose > h2::before {
  content: "Sekcja " counter(sec, decimal-leading-zero);
  display: block; font: 700 .68rem/1 var(--mono);
  letter-spacing: .14em; text-transform: uppercase;
  color: var(--accent); margin-bottom: 8px;
}

/* Pas liczb kluczowych na górze artykułu */
.stats {
  display: grid; grid-template-columns: repeat(auto-fit, minmax(160px, 1fr));
  gap: 1px; background: var(--line); border: 1px solid var(--line);
  border-radius: var(--r); overflow: hidden; margin: 0 0 2.2em;
}
.stats div { background: var(--surface); padding: 16px 16px 14px; }
.stats b { display: block; font: 700 1.55rem/1.1 var(--mono); letter-spacing: -.02em; color: var(--accent); }
.stats span { display: block; font-size: .78rem; color: var(--muted); margin-top: 5px; line-height: 1.4; }

/* Mapa faz procedury: chipy z numerami */
.phasemap { display: grid; grid-template-columns: repeat(3, 1fr); gap: 14px; margin: 0 0 2.2em; }
@media (max-width: 760px) { .phasemap { grid-template-columns: 1fr; } }
.ph { background: var(--surface); border: 1px solid var(--line); border-top: 3px solid var(--accent); border-radius: var(--r); padding: 14px 16px; }
.ph > b { display: block; font: 600 .72rem/1.3 var(--mono); letter-spacing: .1em; text-transform: uppercase; color: var(--ink-2); margin-bottom: 10px; }
.ph ol { margin: 0; padding: 0; list-style: none; font-size: .85rem; }
.ph ol li { padding: 4px 0; color: var(--ink-2); display: flex; gap: 9px; align-items: baseline; }
.ph ol li b {
  font: 700 .68rem/1.7 var(--mono); color: var(--accent-ink); background: var(--accent);
  min-width: 22px; height: 22px; text-align: center; border-radius: 50%; flex: none;
}

/* Diagram obiegu (SVG) */
.diagram { background: var(--surface); border: 1px solid var(--line); border-radius: var(--r); padding: 10px; margin: 0 0 1.4em; overflow-x: auto; }
.diagram svg { width: 100%; min-width: 560px; height: auto; display: block; }

/* Werdykt: dwie kolumny TAK / NIE */
.verdict { display: grid; grid-template-columns: 1fr 1fr; gap: 14px; margin: 0 0 1.8em; }
@media (max-width: 680px) { .verdict { grid-template-columns: 1fr; } }
.verdict > div { border: 1px solid var(--line); border-radius: var(--r); padding: 14px 16px; background: var(--surface); }
.verdict > div.yes { border-top: 3px solid var(--ok); }
.verdict > div.no  { border-top: 3px solid var(--danger); }
.verdict b.hd { display: block; font: 700 .7rem/1 var(--mono); letter-spacing: .12em; text-transform: uppercase; margin-bottom: 10px; }
.verdict .yes b.hd { color: var(--ok); }
.verdict .no  b.hd { color: var(--danger); }
.verdict ul { margin: 0; padding-left: 1.15em; font-size: .89rem; color: var(--ink-2); }
.verdict li { margin-bottom: .4em; }

/* ---------- Tabele ---------- */
.tablewrap { overflow-x: auto; margin: 0 0 1.6em; border: 1px solid var(--line); border-radius: var(--r); background: var(--surface); }
table { border-collapse: collapse; width: 100%; font-size: .875rem; min-width: 500px; }
caption { caption-side: bottom; text-align: left; padding: 9px 13px; font-size: .78rem; color: var(--muted); border-top: 1px solid var(--line); }
th, td { padding: 9px 13px; text-align: left; border-bottom: 1px solid var(--line); vertical-align: top; }
thead th {
  background: var(--surface-2); font: 600 .72rem/1.35 var(--mono);
  letter-spacing: .07em; text-transform: uppercase; color: var(--ink-2); white-space: nowrap;
}
tbody tr:last-child td { border-bottom: 0; }
td.num, th.num { font-family: var(--mono); font-variant-numeric: tabular-nums; white-space: nowrap; }

/* ---------- Callouty ---------- */
.note {
  border: 1px solid var(--line); border-left: 3px solid var(--accent);
  background: var(--accent-bg); border-radius: var(--r);
  padding: 14px 16px; margin: 0 0 1.6em; font-size: .93rem;
}
.note > :last-child { margin-bottom: 0; }
.note b.lbl {
  display: block; font: 700 .68rem/1 var(--mono); letter-spacing: .12em;
  text-transform: uppercase; margin-bottom: 7px; color: var(--accent);
}
.note.warn { border-left-color: var(--warn); background: var(--warn-bg); }
.note.warn b.lbl { color: var(--warn); }
.note.danger { border-left-color: var(--danger); background: var(--danger-bg); }
.note.danger b.lbl { color: var(--danger); }
.note.ok { border-left-color: var(--ok); background: var(--ok-bg); }
.note.ok b.lbl { color: var(--ok); }

/* ---------- Kroki procedury ---------- */
.steps { counter-reset: st; list-style: none; padding: 0; margin: 0 0 1.6em; }
.steps > li {
  counter-increment: st; position: relative;
  padding: 0 0 20px 46px; border-left: 1px solid var(--line); margin-left: 14px;
}
.steps > li:last-child { border-left-color: transparent; padding-bottom: 0; }
.steps > li::before {
  content: counter(st, decimal-leading-zero);
  position: absolute; left: -14px; top: 0;
  width: 28px; height: 28px; display: grid; place-items: center;
  background: var(--accent); color: var(--accent-ink);
  font: 700 .72rem/1 var(--mono); border-radius: 50%;
}
.steps h4 { margin: 3px 0 .35em; font-size: 1.02rem; }
.steps p, .steps ul { font-size: .92rem; color: var(--ink-2); }
.steps > li > :last-child { margin-bottom: 0; }
.stepmeta {
  display: inline-block; font: 600 .68rem/1 var(--mono); letter-spacing: .08em;
  text-transform: uppercase; color: var(--muted);
  border: 1px solid var(--line); border-radius: 2px; padding: 4px 7px; margin-bottom: 8px;
}

/* ---------- Checklisty ---------- */
.check { list-style: none; padding: 0; margin: 0 0 1.6em; }
.check li {
  position: relative; padding: 8px 0 8px 30px; border-bottom: 1px solid var(--line); font-size: .93rem;
}
.check li:last-child { border-bottom: 0; }
.check li::before {
  content: ""; position: absolute; left: 2px; top: 13px;
  width: 14px; height: 14px; border: 1.5px solid var(--line-hard); border-radius: 2px;
}
.check.bad li::before {
  border-color: var(--danger); background: var(--danger); border-radius: 2px;
  content: "×"; color: #fff; font: 700 12px/12px var(--mono); text-align: center;
  display: grid; place-items: center;
}

/* ---------- Definicje / FAQ ---------- */
details {
  border: 1px solid var(--line); border-radius: var(--r); background: var(--surface);
  padding: 0 16px; margin-bottom: 8px;
}
details[open] { padding-bottom: 6px; }
summary { cursor: pointer; padding: 13px 0; font-weight: 570; font-size: .96rem; list-style: none; }
summary::-webkit-details-marker { display: none; }
summary::before { content: "+ "; font-family: var(--mono); color: var(--accent); font-weight: 700; }
details[open] summary::before { content: "− "; }
details p, details ul { font-size: .92rem; color: var(--ink-2); }
details > :last-child { margin-bottom: 12px; }

/* ---------- Kalkulator ---------- */
.calc { display: grid; grid-template-columns: 1fr 1fr; gap: 26px; align-items: start; }
@media (max-width: 900px) { .calc { grid-template-columns: 1fr; } }
.calcbox { background: var(--surface); border: 1px solid var(--line); border-radius: var(--r); padding: 20px; }
.calcbox h3 { margin-top: 0; }
fieldset { border: 0; border-top: 1px solid var(--line); padding: 16px 0 4px; margin: 16px 0 0; }
fieldset:first-of-type { border-top: 0; padding-top: 0; margin-top: 0; }
legend {
  font: 600 .68rem/1 var(--mono); letter-spacing: .12em; text-transform: uppercase;
  color: var(--muted); padding: 0 8px 0 0;
}
.field { display: grid; grid-template-columns: 1fr 118px; gap: 10px; align-items: center; margin-bottom: 9px; }
.field label { font-size: .89rem; color: var(--ink-2); }
.field label small { display: block; color: var(--muted); font-size: .76rem; }
.field input {
  width: 100%; padding: 7px 9px; font: 500 .9rem var(--mono); text-align: right;
  color: var(--ink); background: var(--paper);
  border: 1px solid var(--line-hard); border-radius: var(--r);
}
.field input:focus { outline: 2px solid var(--accent); outline-offset: -1px; border-color: var(--accent); }

.kpi { display: grid; grid-template-columns: repeat(2, 1fr); gap: 1px; background: var(--line); border: 1px solid var(--line); border-radius: var(--r); overflow: hidden; margin-bottom: 18px; }
.kpi div { background: var(--surface); padding: 14px 15px; }
.kpi span { display: block; font-size: .76rem; color: var(--muted); margin-bottom: 3px; }
.kpi b { font: 700 1.4rem/1.1 var(--mono); letter-spacing: -.02em; }
.kpi b.pos { color: var(--ok); }
.kpi b.neg { color: var(--danger); }

.bars { margin: 4px 0 16px; }
.bar { margin-bottom: 11px; }
.bar-h { display: flex; justify-content: space-between; font-size: .82rem; margin-bottom: 4px; }
.bar-h span:last-child { font-family: var(--mono); font-variant-numeric: tabular-nums; }
.bar-t { height: 9px; background: var(--surface-2); border-radius: 2px; overflow: hidden; }
.bar-f { height: 100%; background: var(--accent); border-radius: 2px; transition: width .25s ease; }
.bar-f.c2 { background: var(--warn); }
.bar-f.c3 { background: var(--muted); }
.bar-f.c4 { background: var(--ok); }

/* ---------- Stopka ---------- */
.foot { border-top: 1px solid var(--line); background: var(--surface); padding: 40px 0 30px; margin-top: 40px; }
.foot-in { display: grid; grid-template-columns: 1.6fr repeat(3, 1fr); gap: 30px; }
@media (max-width: 820px) { .foot-in { grid-template-columns: 1fr 1fr; } }
.foot h4 { font: 600 .68rem/1 var(--mono); letter-spacing: .13em; text-transform: uppercase; color: var(--muted); margin: 0 0 12px; }
.foot ul { list-style: none; padding: 0; margin: 0; font-size: .89rem; }
.foot li { margin-bottom: 6px; }
.foot a { color: var(--ink-2); text-decoration: none; }
.foot a:hover { color: var(--accent); text-decoration: underline; }
.foot p { font-size: .87rem; color: var(--muted); max-width: 40ch; }
.foot-bot { border-top: 1px solid var(--line); margin-top: 30px; padding-top: 18px; font-size: .8rem; color: var(--muted); display: flex; justify-content: space-between; gap: 16px; flex-wrap: wrap; }

.badge {
  display: inline-block; font: 600 .68rem/1 var(--mono); letter-spacing: .08em; text-transform: uppercase;
  padding: 4px 7px; border-radius: 2px; background: var(--surface-2); color: var(--ink-2);
}
.badge.a { background: var(--accent-bg); color: var(--accent); }
.badge.w { background: var(--warn-bg); color: var(--warn); }
.badge.d { background: var(--danger-bg); color: var(--danger); }
.badge.o { background: var(--ok-bg); color: var(--ok); }

@media (max-width: 620px) {
  .brand span { display: none; }
  .brand b { font-size: .96rem; }
}

.skip { position: absolute; left: -9999px; }
.skip:focus { left: 8px; top: 8px; background: var(--accent); color: var(--accent-ink); padding: 8px 12px; z-index: 100; border-radius: var(--r); }

@media print {
  .top, .foot, .toc { display: none; }
  body { background: #fff; font-size: 11pt; }
  .article { grid-template-columns: 1fr; }
}