@import url("fonts.css");

/* ─────────────────────────────────────────────────────────────────────────
   Projekt Chemtrails — arkusz stylów
   Kierunek: „przyrząd pomiarowy o północy" — zimne, głębokie tło nieba na
   pułapie przelotowym, hajrlajnowa siatka jak na papierze milimetrowym,
   typografia dziennika naukowego (Fraunces) na korpusie technicznym (Plex).
   ───────────────────────────────────────────────────────────────────────── */

:root {
  --bg:        #070b11;
  --bg-2:      #0b1119;
  --panel:     #0e151f;
  --panel-2:   #111a26;
  --ink:       #dde6ee;
  --ink-dim:   #94a6b8;
  --ink-faint: #64798c;
  --rule:      rgba(148, 178, 208, 0.13);
  --rule-soft: rgba(148, 178, 208, 0.07);

  --s1: #3492C2;   /* obserwacja / fizyka   */
  --s2: #BC781C;   /* czego teoria wymaga   */
  --s3: #C8405C;   /* co niemożliwe         */
  --s4: #7E62CE;   /* akcent                */
  --s5: #1E8F76;   /* odniesienie           */
  --s1-lift: #6bb6de;
  --s2-lift: #e0a04b;
  --s3-lift: #e57a90;

  --sans: "IBM Plex Sans", ui-sans-serif, system-ui, sans-serif;
  --serif: "Fraunces", Georgia, "Times New Roman", serif;
  --mono: "IBM Plex Mono", ui-monospace, SFMono-Regular, monospace;

  --measure: 68ch;
  --wide: 1180px;
  --ease: cubic-bezier(.22, .61, .36, 1);
}

*, *::before, *::after { box-sizing: border-box; }

html { scroll-behavior: smooth; scroll-padding-top: 5rem; }
@media (prefers-reduced-motion: reduce) { html { scroll-behavior: auto; } }

body {
  margin: 0;
  background: var(--bg);
  color: var(--ink);
  font-family: var(--sans);
  font-size: clamp(1rem, 0.96rem + 0.2vw, 1.075rem);
  line-height: 1.72;
  -webkit-font-smoothing: antialiased;
  text-rendering: optimizeLegibility;
  overflow-x: hidden;
}

/* atmosfera: gradient wysokościowy + ziarno */
body::before {
  content: "";
  position: fixed; inset: 0; z-index: -2;
  background:
    radial-gradient(120% 70% at 50% -10%, #16293d 0%, rgba(12,20,30,0) 62%),
    linear-gradient(180deg, #08101a 0%, var(--bg) 46%, #05080d 100%);
}
body::after {
  content: "";
  position: fixed; inset: 0; z-index: -1; pointer-events: none;
  opacity: .16; mix-blend-mode: overlay;
  background-image: url("data:image/svg+xml,%3Csvg xmlns='http://www.w3.org/2000/svg' width='180' height='180'%3E%3Cfilter id='n'%3E%3CfeTurbulence type='fractalNoise' baseFrequency='.85' numOctaves='3'/%3E%3C/filter%3E%3Crect width='180' height='180' filter='url(%23n)' opacity='.5'/%3E%3C/svg%3E");
}

/* ── typografia ─────────────────────────────────────────────────────────── */

h1, h2, h3, h4 {
  font-family: var(--serif);
  font-weight: 600;
  font-variation-settings: "SOFT" 0, "WONK" 0;
  line-height: 1.12;
  letter-spacing: -0.017em;
  text-wrap: balance;
  margin: 0;
}
h1 { font-size: clamp(2.5rem, 1.6rem + 4.2vw, 5rem); }
h2 { font-size: clamp(1.85rem, 1.3rem + 2.1vw, 2.9rem); }
h3 { font-size: clamp(1.2rem, 1.05rem + 0.7vw, 1.5rem); letter-spacing: -0.01em; }

p { margin: 0 0 1.15em; }
a { color: var(--s1-lift); text-decoration-color: rgba(107,182,222,.35); text-underline-offset: .18em; }
a:hover { text-decoration-color: currentColor; }
strong { font-weight: 600; color: #f0f5fa; }
em { font-style: italic; color: #cfdae5; }

.mono { font-family: var(--mono); }
.kicker {
  font-family: var(--mono);
  font-size: .72rem; letter-spacing: .22em; text-transform: uppercase;
  color: var(--ink-faint);
}

/* ── układ ──────────────────────────────────────────────────────────────── */

.wrap { width: min(100% - 2.5rem, var(--wide)); margin-inline: auto; }
.col  { width: min(100%, var(--measure)); }
main  { position: relative; }

/* pasek postępu czytania */
#progress {
  position: fixed; top: 0; left: 0; height: 2px; width: 0;
  background: linear-gradient(90deg, var(--s1), var(--s4));
  z-index: 100; transition: width .1s linear;
}

/* nagłówek nawigacyjny */
.topbar {
  position: sticky; top: 0; z-index: 60;
  backdrop-filter: blur(14px);
  background: rgba(7, 11, 17, .72);
  border-bottom: 1px solid var(--rule-soft);
}
.topbar__in {
  width: min(100% - 2.5rem, var(--wide)); margin-inline: auto;
  display: flex; align-items: center; gap: 1.5rem;
  height: 3.4rem;
}
.topbar__brand {
  font-family: var(--mono); font-size: .78rem; letter-spacing: .16em;
  text-transform: uppercase; color: var(--ink-dim); text-decoration: none;
  white-space: nowrap;
}
.topbar__brand b { color: var(--ink); font-weight: 500; }
.topbar nav { margin-left: auto; display: flex; gap: 1.25rem; overflow-x: auto; }
.topbar nav a {
  font-family: var(--mono); font-size: .74rem; color: var(--ink-faint);
  text-decoration: none; white-space: nowrap; padding: .25rem 0;
  border-bottom: 1px solid transparent;
}
.topbar nav a:hover, .topbar nav a[aria-current="true"] {
  color: var(--ink); border-bottom-color: var(--s1);
}
@media (max-width: 760px) { .topbar nav { display: none; } }

/* ── hero ───────────────────────────────────────────────────────────────── */

.hero { position: relative; padding: clamp(3.5rem, 8vh, 7rem) 0 clamp(2.5rem, 5vh, 4rem); overflow: hidden; }
.hero__sky { position: absolute; inset: 0; z-index: 0; pointer-events: none; opacity: .85; }
.hero__sky path { fill: none; stroke-linecap: round; }
.hero .wrap { position: relative; z-index: 1; }
.hero h1 { margin: 1.1rem 0 0; max-width: 19ch; }
.hero h1 .q { color: var(--ink-faint); }
.hero__lead {
  margin-top: 1.6rem; max-width: 60ch;
  font-size: clamp(1.06rem, 1rem + 0.45vw, 1.3rem);
  color: #c3d1de;
}
.hero__meta {
  margin-top: 2.2rem; display: flex; flex-wrap: wrap; gap: .5rem 1.5rem;
  font-family: var(--mono); font-size: .74rem; color: var(--ink-faint);
}

/* płyty ze statystykami */
.slabs {
  display: grid; gap: 1px; margin-top: 3.2rem;
  grid-template-columns: repeat(auto-fit, minmax(210px, 1fr));
  background: var(--rule-soft);
  border: 1px solid var(--rule-soft);
}
.slab { background: var(--bg-2); padding: 1.5rem 1.4rem 1.35rem; }
.slab b {
  display: block; font-family: var(--serif); font-weight: 600;
  font-size: clamp(2rem, 1.4rem + 1.9vw, 2.9rem); line-height: 1;
  letter-spacing: -0.03em; color: var(--ink);
  font-variant-numeric: lining-nums tabular-nums;
}
.slab b sup { font-size: .48em; top: -.6em; }
.slab span { display: block; margin-top: .7rem; font-size: .86rem; color: var(--ink-dim); line-height: 1.5; }
.slab.is-1 b { color: var(--s1-lift); }
.slab.is-2 b { color: var(--s2-lift); }
.slab.is-3 b { color: var(--s3-lift); }

/* ── sekcje ─────────────────────────────────────────────────────────────── */

section.chapter { padding: clamp(3.5rem, 7vh, 6.5rem) 0; border-top: 1px solid var(--rule-soft); }
.chapter__head { display: flex; gap: 1.4rem; align-items: baseline; margin-bottom: 2.2rem; }
.chapter__num {
  font-family: var(--mono); font-size: .8rem; color: var(--s1);
  letter-spacing: .1em; padding-top: .45rem; flex: none;
}
.chapter h2 { max-width: 22ch; }
.chapter .col h2 { max-width: none; margin-bottom: .9rem; }   /* podstrony: nagłówki na pełną szerokość kolumny */
.chapter__sub { margin-top: .9rem; color: var(--ink-dim); max-width: 58ch; font-size: 1.02rem; }

.lede { font-size: 1.12rem; color: #cbd8e4; }

/* wyróżnienia */
.callout {
  margin: 2rem 0; padding: 1.15rem 1.35rem;
  background: var(--panel); border-left: 2px solid var(--s2);
  border-radius: 0 4px 4px 0;
}
.callout .kicker { color: var(--s2-lift); }
.callout p:last-child { margin-bottom: 0; }
.callout.is-answer { border-left-color: var(--s1); }
.callout.is-answer .kicker { color: var(--s1-lift); }
.callout.is-limit { border-left-color: var(--s4); background: #10121f; }
.callout.is-limit .kicker { color: #a894e0; }

/* wzory */
.eq {
  margin: 1.9rem 0; padding: 1.3rem 1.4rem;
  background: var(--panel-2); border: 1px solid var(--rule-soft); border-radius: 5px;
  overflow-x: auto;
}
.eq math { font-size: 1.22rem; color: var(--ink); }
.eq__where {
  margin-top: 1rem; padding-top: .85rem; border-top: 1px solid var(--rule-soft);
  font-family: var(--mono); font-size: .78rem; color: var(--ink-dim); line-height: 1.85;
}
.eq__where b { font-family: var(--mono); color: var(--s1-lift); font-weight: 500; }
.eq__out {
  margin-top: 1rem; font-family: var(--mono); font-size: .84rem;
  color: var(--s2-lift);
}

/* liczby w tekście */
.num { font-family: var(--mono); font-variant-numeric: tabular-nums; color: #eaf1f7; }

/* ── figury ─────────────────────────────────────────────────────────────── */

figure.fig { margin: 2.6rem 0 2.2rem; }
figure.fig .scroller { overflow-x: auto; overscroll-behavior-x: contain; }
@media (max-width: 780px) {
  /* zamiast ściskać etykiety do nieczytelności — przewijamy wykres w poziomie */
  figure.fig .chart { min-width: 620px; }
  figure.fig .scroller::after {
    content: "← przesuń, żeby zobaczyć całość →";
    display: block; text-align: center; padding-top: .5rem;
    font-family: var(--mono); font-size: .68rem; color: var(--ink-faint);
  }
}
figure.fig .chart {
  width: 100%; height: auto; display: block;
  background: var(--panel); border: 1px solid var(--rule-soft); border-radius: 6px;
  padding: .4rem;
}
figure.fig figcaption {
  margin-top: .9rem; font-size: .86rem; color: var(--ink-dim);
  display: flex; gap: .75rem; align-items: baseline;
}
figure.fig figcaption .tag {
  font-family: var(--mono); font-size: .7rem; letter-spacing: .12em;
  text-transform: uppercase; color: var(--s1); flex: none; padding-top: .12rem;
}
figure.fig details { margin-top: .8rem; }
figure.fig summary {
  font-family: var(--mono); font-size: .74rem; color: var(--ink-faint);
  cursor: pointer; list-style: none;
}
figure.fig summary::before { content: "▸ "; }
figure.fig details[open] summary::before { content: "▾ "; }
figure.fig summary:hover { color: var(--ink); }

/* elementy SVG */
.chart .grid  { stroke: var(--rule-soft); stroke-width: 1; }
.chart .axis  { stroke: var(--rule); stroke-width: 1; }
.chart .thr   { stroke: var(--ink-faint); stroke-width: 1; stroke-dasharray: 3 4; }
.chart .ln    { fill: none; stroke-width: 2.2; stroke-linejoin: round; stroke-linecap: round; }
.chart .ln.dash { stroke-dasharray: 6 5; }
.chart .ln.mix  { stroke-width: 2.4; }
.chart .band  { fill: var(--s1); opacity: .10; stroke: none; }
.chart .layer.trop  { fill: #12202e; opacity: .55; }
.chart .layer.strat { fill: #0e1a2a; opacity: .45; }
.chart text  { font-family: var(--mono); fill: var(--ink-dim); }
.chart .tick { font-size: 11.5px; }
.chart .val  { font-size: 12.5px; fill: var(--ink); }
.chart .note { font-size: 11px; fill: var(--ink-dim); }
.chart .axlab{ font-size: 11.5px; fill: var(--ink-faint); letter-spacing: .04em; }
.chart circle, .chart rect, .chart path { transition: opacity .15s var(--ease); }
.chart:hover rect[title], .chart rect:hover { opacity: .88; }

/* tabele */
table.data {
  width: 100%; border-collapse: collapse; margin: 1.2rem 0;
  font-size: .87rem; font-variant-numeric: tabular-nums;
}
table.data th, table.data td {
  text-align: left; padding: .55rem .7rem; border-bottom: 1px solid var(--rule-soft);
}
table.data th {
  font-family: var(--mono); font-size: .7rem; letter-spacing: .1em;
  text-transform: uppercase; color: var(--ink-faint); font-weight: 500;
}
table.data td.n { text-align: right; font-family: var(--mono); }
table.data tr:last-child td { border-bottom: none; }
table.data tr.total td { border-top: 1px solid var(--rule); font-weight: 600; color: #fff; }
table.data td small { color: var(--ink-faint); display: block; font-size: .8em; line-height: 1.45; }

/* ── kalkulator ─────────────────────────────────────────────────────────── */

.calc {
  margin: 2.5rem 0; border: 1px solid var(--rule); border-radius: 7px;
  background: linear-gradient(180deg, var(--panel-2), var(--panel));
  overflow: hidden;
}
.calc__head {
  padding: 1.1rem 1.4rem; border-bottom: 1px solid var(--rule-soft);
  display: flex; align-items: baseline; gap: 1rem; flex-wrap: wrap;
}
.calc__head h3 { font-size: 1.15rem; }
.calc__head p { margin: 0; font-size: .85rem; color: var(--ink-faint); }
.calc__body { display: grid; grid-template-columns: minmax(0, 1fr) minmax(0, 1fr); }
@media (max-width: 780px) { .calc__body { grid-template-columns: 1fr; } }
.calc__inputs { padding: 1.4rem; border-right: 1px solid var(--rule-soft); }
@media (max-width: 780px) { .calc__inputs { border-right: none; border-bottom: 1px solid var(--rule-soft); } }
.calc__out { padding: 1.4rem; background: rgba(0,0,0,.16); }

.field { margin-bottom: 1.25rem; }
.field:last-child { margin-bottom: 0; }
.field label {
  display: flex; justify-content: space-between; align-items: baseline; gap: 1rem;
  font-size: .84rem; color: var(--ink-dim); margin-bottom: .5rem;
}
.field label output {
  font-family: var(--mono); color: var(--s1-lift); font-size: .85rem;
  font-variant-numeric: tabular-nums;
}
input[type="range"] {
  width: 100%; appearance: none; height: 3px; border-radius: 2px;
  background: linear-gradient(90deg, var(--s1) var(--pct, 50%), rgba(148,178,208,.18) var(--pct, 50%));
  outline: none;
}
input[type="range"]::-webkit-slider-thumb {
  appearance: none; width: 15px; height: 15px; border-radius: 50%;
  background: var(--ink); border: 3px solid var(--bg); cursor: grab;
  box-shadow: 0 0 0 1px var(--s1);
}
input[type="range"]::-moz-range-thumb {
  width: 15px; height: 15px; border-radius: 50%; background: var(--ink);
  border: 3px solid var(--bg); cursor: grab; box-shadow: 0 0 0 1px var(--s1);
}
select {
  width: 100%; background: var(--panel); color: var(--ink);
  border: 1px solid var(--rule); border-radius: 4px; padding: .5rem .6rem;
  font-family: var(--mono); font-size: .82rem;
}
.check { display: flex; align-items: flex-start; gap: .65rem; font-size: .87rem; color: var(--ink-dim); cursor: pointer; }
.check input { margin-top: .35rem; accent-color: var(--s1); }

.readout { margin-bottom: 1.35rem; }
.readout:last-child { margin-bottom: 0; }
.readout .k {
  font-family: var(--mono); font-size: .7rem; letter-spacing: .13em;
  text-transform: uppercase; color: var(--ink-faint); display: block; margin-bottom: .3rem;
}
.readout .v {
  font-family: var(--serif); font-weight: 600; font-size: 2rem; line-height: 1.05;
  letter-spacing: -.02em; font-variant-numeric: tabular-nums;
}
.readout .v sup { font-size: .5em; }
.readout .v.warn { color: var(--s3-lift); }
.readout .v.ok { color: var(--s1-lift); }
.readout .u { font-size: .82rem; color: var(--ink-faint); margin-left: .4rem; font-family: var(--sans); }

/* ── FAQ ────────────────────────────────────────────────────────────────── */

.qa { border-top: 1px solid var(--rule-soft); }
.qa details { border-bottom: 1px solid var(--rule-soft); }
.qa summary {
  padding: 1.15rem 2.5rem 1.15rem 0; cursor: pointer; list-style: none;
  font-family: var(--serif); font-size: 1.12rem; font-weight: 600;
  letter-spacing: -.01em; position: relative; color: #e8eff5;
}
.qa summary::-webkit-details-marker { display: none; }
.qa summary::after {
  content: "+"; position: absolute; right: .25rem; top: 1.05rem;
  font-family: var(--mono); color: var(--s1); font-size: 1.2rem; transition: transform .2s var(--ease);
}
.qa details[open] summary::after { transform: rotate(45deg); }
.qa summary:hover { color: #fff; }
.qa .qa__body { padding: 0 0 1.4rem; color: var(--ink-dim); max-width: 62ch; }
.qa .qa__body p:last-child { margin-bottom: 0; }

/* ── stopka / źródła ────────────────────────────────────────────────────── */

.refs { counter-reset: ref; }
.ref {
  padding: 1.1rem 0; border-bottom: 1px solid var(--rule-soft);
  display: grid; grid-template-columns: 3.2rem 1fr; gap: 1rem;
}
.ref__n { font-family: var(--mono); font-size: .75rem; color: var(--s1); padding-top: .3rem; }
.ref__b b { display: block; font-weight: 600; color: #e9f0f6; font-size: .98rem; }
.ref__b span { display: block; font-size: .87rem; color: var(--ink-dim); margin-top: .3rem; }
.ref__b a { font-family: var(--mono); font-size: .76rem; word-break: break-all; }

footer.site {
  border-top: 1px solid var(--rule-soft); padding: 3rem 0 4rem;
  color: var(--ink-faint); font-size: .85rem;
}
footer.site .cols { display: flex; flex-wrap: wrap; gap: 2.5rem; justify-content: space-between; }
footer.site a { color: var(--ink-dim); }

/* ── animacje wejścia ───────────────────────────────────────────────────── */

/* Treść jest widoczna domyślnie. Ukrywamy ją do animacji dopiero wtedy, gdy
   JavaScript działa i na pewno ją odsłoni — inaczej awaria skryptu = pusta strona. */
.js .rise { opacity: 0; transform: translateY(14px); transition: opacity .7s var(--ease), transform .7s var(--ease); }
.js .rise.in { opacity: 1; transform: none; }
.hero .rise { transition-delay: var(--d, 0ms); }

.draw { stroke-dasharray: var(--len, 1200); stroke-dashoffset: var(--len, 1200); animation: draw 2.6s var(--ease) forwards; }
@keyframes draw { to { stroke-dashoffset: 0; } }

@media (prefers-reduced-motion: reduce) {
  .js .rise, .rise { opacity: 1; transform: none; transition: none; }
  .draw { animation: none; stroke-dashoffset: 0; }
}

/* ── drobiazgi ──────────────────────────────────────────────────────────── */

hr.rule { border: none; border-top: 1px solid var(--rule-soft); margin: 3rem 0; }
.pill {
  display: inline-block; font-family: var(--mono); font-size: .68rem;
  letter-spacing: .1em; text-transform: uppercase; padding: .22rem .55rem;
  border: 1px solid var(--rule); border-radius: 100px; color: var(--ink-dim);
}
sup.cite { font-family: var(--mono); font-size: .68em; }
sup.cite a { text-decoration: none; padding: 0 .1em; }
::selection { background: rgba(52,146,194,.35); }

/* ── przełącznik języków ────────────────────────────────────────────────── */

.langsw { display: flex; gap: .3rem; margin-left: 1.25rem; flex: none; }
.langsw .lang {
  font-family: var(--mono); font-size: .7rem; letter-spacing: .08em;
  color: var(--ink-faint); text-decoration: none; padding: .18rem .4rem;
  border: 1px solid transparent; border-radius: 3px; line-height: 1.4;
}
.langsw .lang:hover { color: var(--ink); border-color: var(--rule); }
.langsw .lang.is-on { color: #08111b; background: var(--s1); border-color: var(--s1); }
@media (max-width: 760px) { .langsw { margin-left: auto; } }

/* licznik odsłon w stopce */
.hits {
  font-family: var(--mono); color: var(--ink); font-variant-numeric: tabular-nums;
  font-size: 1.05rem;
}
.hits[data-state="off"] { display: none; }