/* ==========================================================================
   OnlineKonwerter.pl — system projektowy
   Koncept: TRANSFORMACJA (zimne indygo -> ciepły koral = "przed -> po").
   Mobile-first. Jednostki vw/rem/%. Tryb ciemny przez prefers-color-scheme.
   ========================================================================== */

:root {
  /* paleta */
  --ink:        #12131b;
  --ink-soft:   #2c2f3d;
  --muted:      #61667a;
  --line:       #e6e7ef;
  --paper:      #fbfbfd;
  --surface:    #ffffff;
  --surface-2:  #f3f4fa;
  --iris:       #5b50e6;   /* akcent główny */
  --iris-d:     #443bc7;
  --iris-soft:  #eceaff;
  --coral:      #ff7a45;   /* akcent "po / sukces" */
  --coral-soft: #fff0e8;
  --ok:         #1f9d63;
  --ok-soft:    #e6f6ee;
  --warn:       #c8801b;
  --danger:     #d23b3b;

  /* typografia */
  --font: system-ui, -apple-system, "Segoe UI", Roboto, "Helvetica Neue", Arial, "Noto Sans", sans-serif;
  --mono: ui-monospace, "SFMono-Regular", "Cascadia Code", "JetBrains Mono", Consolas, monospace;

  /* skala / przestrzeń */
  --radius: 14px;
  --radius-s: 10px;
  --radius-xs: 8px;
  --shadow-1: 0 1px 2px rgba(18,19,27,.06), 0 1px 1px rgba(18,19,27,.04);
  --shadow-2: 0 10px 30px -12px rgba(28,28,60,.28);
  --maxw: 1120px;
  --gap: clamp(16px, 3.2vw, 28px);
}

@media (prefers-color-scheme: dark) {
  :root {
    --ink:        #eef0f8;
    --ink-soft:   #c9ccdd;
    --muted:      #969ab2;
    --line:       #262838;
    --paper:      #0e0f16;
    --surface:    #161826;
    --surface-2:  #1d2030;
    --iris:       #8f86ff;
    --iris-d:     #a79fff;
    --iris-soft:  #20203a;
    --coral:      #ff8a5c;
    --coral-soft: #2a1c16;
    --ok:         #4cd394;
    --ok-soft:    #112a1f;
    --shadow-2:   0 10px 30px -12px rgba(0,0,0,.6);
  }
}

* { 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;
  font-family: var(--font);
  font-size: clamp(15px, 1.05vw + 12px, 17px);
  line-height: 1.65;
  color: var(--ink);
  background: var(--paper);
  -webkit-font-smoothing: antialiased;
  text-rendering: optimizeLegibility;
}

img { max-width: 100%; height: auto; display: block; }
a { color: var(--iris-d); text-underline-offset: 2px; }
a:hover { color: var(--iris); }
:focus-visible { outline: 3px solid var(--iris); outline-offset: 2px; border-radius: 6px; }

.container { width: 100%; max-width: var(--maxw); margin-inline: auto; padding-inline: clamp(16px, 4vw, 28px); }
.section { padding-block: clamp(34px, 6vw, 64px); }
.section--tight { padding-block: clamp(22px, 4vw, 40px); }

/* ---------- typografia ---------- */
h1, h2, h3, h4, h5, h6 { line-height: 1.18; color: var(--ink); margin: 0 0 .5em; font-weight: 800; letter-spacing: -.02em; }
h1 { font-size: clamp(1.85rem, 4.6vw, 3rem); }
h2 { font-size: clamp(1.4rem, 3vw, 2rem); }
h3 { font-size: clamp(1.15rem, 2vw, 1.4rem); font-weight: 750; }
h4 { font-size: 1.05rem; font-weight: 700; letter-spacing: -.01em; }
h5, h6 { font-size: .95rem; font-weight: 700; letter-spacing: 0; text-transform: uppercase; color: var(--muted); }
p { margin: 0 0 1em; }
.lead { font-size: clamp(1.05rem, 1.6vw, 1.22rem); color: var(--ink-soft); }
.eyebrow { display:inline-block; font: 700 .8rem/1 var(--mono); letter-spacing: .12em; text-transform: uppercase; color: var(--iris); background: var(--iris-soft); padding: .45em .7em; border-radius: 999px; margin-bottom: 14px; }
.prose :is(h2,h3) { margin-top: 1.4em; }
.prose ul, .prose ol { padding-left: 1.25em; margin: 0 0 1em; }
.prose li { margin-bottom: .35em; }
.muted { color: var(--muted); }
.small { font-size: .9rem; }

/* ---------- signature: pigułka transformacji  FROM -> TO ---------- */
.xform { display:inline-flex; align-items:center; gap:.55em; font: 800 .92rem/1 var(--mono); letter-spacing: .02em;
  background: var(--surface); border:1px solid var(--line); border-radius:999px; padding:.5em .8em; box-shadow: var(--shadow-1); }
.xform .from { color: var(--iris); }
.xform .to   { color: var(--coral); }
.xform .arrow { color: var(--muted); transition: transform .25s ease; }
.xform:hover .arrow, .is-busy .xform .arrow { transform: translateX(4px); }
@media (prefers-reduced-motion: reduce){ .xform .arrow { transition: none; } }

/* ---------- nagłówek + nawigacja (bez JS, hamburger na :checked) ---------- */
.site-header { position: sticky; top: 0; z-index: 50; background: color-mix(in srgb, var(--paper) 88%, transparent); backdrop-filter: saturate(1.4) blur(8px); border-bottom: 1px solid var(--line); }
.nav { display:flex; align-items:center; gap: 16px; min-height: 60px; }
.brand { display:flex; align-items:center; gap:.55rem; font-weight:800; letter-spacing:-.02em; color:var(--ink); text-decoration:none; font-size:1.12rem; }
.brand .logo { width:30px; height:30px; flex:0 0 auto; }
.brand b { color: var(--iris); }
.nav-spacer { flex: 1; }
.nav-toggle { display:none; }
.nav-burger { display:inline-flex; align-items:center; justify-content:center; width:42px; height:42px; border:1px solid var(--line); border-radius:var(--radius-xs); background:var(--surface); cursor:pointer; }
.nav-burger span, .nav-burger span::before, .nav-burger span::after { content:""; display:block; width:18px; height:2px; background:var(--ink); position:relative; transition:.2s; }
.nav-burger span::before { position:absolute; top:-6px; }
.nav-burger span::after  { position:absolute; top:6px; }
.nav-links { display:flex; gap: 4px; align-items:center; }
.nav-links a { color: var(--ink-soft); text-decoration:none; font-weight:600; font-size:.96rem; padding:.5rem .7rem; border-radius:var(--radius-xs); }
.nav-links a:hover, .nav-links a[aria-current="page"] { color: var(--iris); background: var(--iris-soft); }
.nav-cta { background: var(--iris); color:#fff !important; padding:.55rem .9rem !important; }
.nav-cta:hover { background: var(--iris-d); }

@media (max-width: 860px) {
  .nav-burger { order: 3; }
  .nav-links { order: 4; flex-basis:100%; flex-direction:column; align-items:stretch; gap:2px; display:none; padding:10px 0 14px; }
  .nav-links a { padding:.8rem .6rem; }
  .nav-toggle:checked ~ .nav-links { display:flex; }
}

/* ---------- przyciski ---------- */
.btn { --b:var(--iris); display:inline-flex; align-items:center; justify-content:center; gap:.5em; font: 700 .98rem/1 var(--font);
  padding:.8em 1.15em; border-radius:var(--radius-s); border:1px solid transparent; background:var(--b); color:#fff; cursor:pointer; text-decoration:none; transition: filter .15s, transform .05s; }
.btn:hover { filter: brightness(1.05); color:#fff; }
.btn:active { transform: translateY(1px); }
.btn[disabled] { opacity:.5; cursor:not-allowed; }
.btn--coral { --b: var(--coral); }
.btn--ghost { background: var(--surface); color: var(--ink); border-color: var(--line); }
.btn--ghost:hover { background: var(--surface-2); color: var(--ink); }
.btn--sm { padding:.55em .8em; font-size:.88rem; border-radius:var(--radius-xs); }
.btn-row { display:flex; flex-wrap:wrap; gap:10px; }

/* ---------- karty / siatki ---------- */
.grid { display:grid; gap: var(--gap); }
.grid--cards { grid-template-columns: repeat(auto-fill, minmax(min(100%, 250px), 1fr)); }
.card { background: var(--surface); border:1px solid var(--line); border-radius: var(--radius); padding: 20px; box-shadow: var(--shadow-1); }
.tool-card { display:flex; flex-direction:column; gap:10px; text-decoration:none; color:var(--ink); transition: border-color .15s, box-shadow .15s, transform .15s; }
.tool-card:hover { border-color: color-mix(in srgb, var(--iris) 45%, var(--line)); box-shadow: var(--shadow-2); transform: translateY(-2px); color:var(--ink); }
.tool-card .ic { width:40px; height:40px; border-radius:10px; display:grid; place-items:center; background:var(--iris-soft); color:var(--iris); font: 800 .9rem/1 var(--mono); }
.tool-card h3 { font-size:1.05rem; margin:0; }
.tool-card p { margin:0; color:var(--muted); font-size:.92rem; }
.cat-chip { font: 700 .72rem/1 var(--mono); letter-spacing:.08em; text-transform:uppercase; color:var(--coral); }

/* ---------- HERO + konwerter ---------- */
.hero { background:
    radial-gradient(60% 60% at 85% -10%, color-mix(in srgb, var(--coral) 14%, transparent), transparent 70%),
    radial-gradient(55% 55% at 5% 0%, color-mix(in srgb, var(--iris) 16%, transparent), transparent 70%);
  border-bottom:1px solid var(--line); }
.hero .container { display:grid; gap: clamp(20px, 4vw, 40px); padding-block: clamp(26px, 5vw, 52px); }
.hero h1 { margin-bottom:.3em; }
.hero .lead { max-width: 56ch; }
.hero-trust { display:flex; flex-wrap:wrap; gap: 8px 18px; margin-top: 14px; font-size:.9rem; color:var(--muted); }
.hero-trust b { color: var(--ink); }
.hero-trust .dot { color: var(--ok); }

/* widżet narzędzia (uniwersalny kontener) */
.tool { background: var(--surface); border:1px solid var(--line); border-radius: var(--radius); box-shadow: var(--shadow-2); overflow:hidden; }
.tool__head { display:flex; align-items:center; justify-content:space-between; gap:12px; padding: 14px 16px; border-bottom:1px solid var(--line); background: var(--surface); flex-wrap:wrap; }
.tool__title { display:flex; align-items:center; gap:10px; font-weight:750; }
.tool__body { padding: clamp(16px, 3vw, 24px); }
.tool__opts { display:flex; flex-wrap:wrap; gap:14px 22px; align-items:flex-end; margin-bottom:16px; }
.field { display:flex; flex-direction:column; gap:6px; min-width: 0; }
.field label { font-size:.82rem; font-weight:700; color:var(--ink-soft); letter-spacing:.01em; }
.field .hint { font-size:.78rem; color:var(--muted); }

/* dropzone */
.dropzone { display:flex; flex-direction:column; align-items:center; gap:2px; position:relative; width:100%; box-sizing:border-box;
  border:2px dashed color-mix(in srgb, var(--iris) 35%, var(--line)); border-radius: var(--radius); background: var(--surface-2);
  padding: clamp(22px, 5vw, 40px); text-align:center; cursor:pointer; transition: background .15s, border-color .15s; }
.dropzone:hover, .dropzone.is-over { border-color: var(--iris); background: var(--iris-soft); }
.dropzone .dz-ic { font-size: 1.8rem; }
.dropzone strong { display:block; font-size:1.05rem; margin-top:6px; }
.dropzone .dz-sub { color: var(--muted); font-size:.9rem; margin-top:2px; }
.dropzone input[type=file] { position:absolute; width:1px; height:1px; opacity:0; pointer-events:none; }

/* kontrolki formularzy */
input[type=text], input[type=number], input[type=url], select, textarea {
  width:100%; font: inherit; color:var(--ink); background:var(--surface); border:1px solid var(--line); border-radius:var(--radius-xs); padding:.62em .7em; }
input:focus, select:focus, textarea:focus { border-color: var(--iris); outline: none; box-shadow: 0 0 0 3px var(--iris-soft); }
textarea { min-height: 120px; resize: vertical; font-variant-ligatures: none; }
input[type=range] { width:100%; accent-color: var(--iris); }
.switch { display:inline-flex; align-items:center; gap:.55em; cursor:pointer; user-select:none; font-size:.92rem; }
.switch input { position:absolute; opacity:0; width:0; height:0; }
.switch .track { width:40px; height:23px; border-radius:999px; background:var(--line); position:relative; transition:.18s; flex:0 0 auto; }
.switch .track::after { content:""; position:absolute; top:2px; left:2px; width:19px; height:19px; border-radius:50%; background:#fff; transition:.18s; box-shadow:0 1px 2px rgba(0,0,0,.25); }
.switch input:checked + .track { background: var(--iris); }
.switch input:checked + .track::after { transform: translateX(17px); }

/* wyniki */
.results { margin-top: 18px; display:grid; gap:10px; }
.res { display:flex; align-items:center; gap:12px; padding:10px 12px; border:1px solid var(--line); border-radius:var(--radius-s); background:var(--surface); }
.res__thumb { width:46px; height:46px; border-radius:8px; object-fit:cover; background:var(--surface-2); flex:0 0 auto; border:1px solid var(--line); }
.res__meta { min-width:0; flex:1; }
.res__name { font-weight:650; font-size:.92rem; overflow:hidden; text-overflow:ellipsis; white-space:nowrap; }
.res__sub { font: .8rem/1.3 var(--mono); color:var(--muted); }
.res__sub .down { color: var(--ok); }
.tag { font: 700 .7rem/1 var(--mono); padding:.3em .5em; border-radius:6px; background:var(--ok-soft); color:var(--ok); }
.bigout { font: 800 clamp(1.4rem,4vw,2.1rem)/1.1 var(--mono); color:var(--iris); word-break:break-all; }
.bigout small { font: 600 .8rem/1 var(--mono); color:var(--muted); }
.readout { display:grid; gap:8px; }
.readout .row { display:flex; align-items:center; justify-content:space-between; gap:12px; padding:9px 12px; border:1px solid var(--line); border-radius:var(--radius-xs); background:var(--surface-2); }
.readout .row code { font:600 .95rem var(--mono); color:var(--ink); }
.progress { height:6px; border-radius:999px; background:var(--line); overflow:hidden; }
.progress > i { display:block; height:100%; width:0; background: linear-gradient(90deg, var(--iris), var(--coral)); transition: width .2s; }
.note { font-size:.86rem; color:var(--muted); margin-top:12px; }
.alert { border:1px solid; border-radius:var(--radius-s); padding:10px 12px; font-size:.9rem; margin-top:12px; }
.alert--warn { border-color: color-mix(in srgb, var(--warn) 45%, var(--line)); background: color-mix(in srgb, var(--warn) 8%, var(--surface)); color: var(--ink); }
.alert--err { border-color: color-mix(in srgb, var(--danger) 45%, var(--line)); background: color-mix(in srgb, var(--danger) 8%, var(--surface)); color: var(--ink); }
.swatch { width:100%; height:64px; border-radius:var(--radius-xs); border:1px solid var(--line); }

/* ---------- okruszki ---------- */
.crumbs { font-size:.85rem; color:var(--muted); padding-block: 14px; }
.crumbs ol { list-style:none; display:flex; flex-wrap:wrap; gap:.4em; margin:0; padding:0; }
.crumbs a { color:var(--muted); text-decoration:none; }
.crumbs a:hover { color: var(--iris); }
.crumbs li::after { content:"›"; margin-left:.4em; color:var(--line); }
.crumbs li:last-child::after { content:""; }
.crumbs li:last-child { color: var(--ink-soft); font-weight:600; }

/* ---------- kroki (prawdziwa sekwencja => numeracja uzasadniona) ---------- */
.steps { counter-reset: s; display:grid; gap:14px; grid-template-columns: repeat(auto-fit, minmax(min(100%,220px),1fr)); }
.step { position:relative; padding:18px 18px 18px 56px; border:1px solid var(--line); border-radius:var(--radius); background:var(--surface); }
.step::before { counter-increment:s; content: counter(s); position:absolute; left:16px; top:16px; width:30px; height:30px; border-radius:9px; background: var(--iris); color:#fff; font:800 1rem/30px var(--mono); text-align:center; }
.step h3 { font-size:1.02rem; margin:0 0 .25em; }
.step p { margin:0; color:var(--muted); font-size:.92rem; }

/* ---------- FAQ ---------- */
.faq { display:grid; gap:10px; }
.faq details { border:1px solid var(--line); border-radius:var(--radius-s); background:var(--surface); overflow:hidden; }
.faq summary { cursor:pointer; padding:14px 16px; font-weight:700; list-style:none; display:flex; justify-content:space-between; gap:12px; align-items:center; }
.faq summary::-webkit-details-marker { display:none; }
.faq summary::after { content:"+"; font:700 1.3rem/1 var(--mono); color:var(--iris); transition: transform .2s; }
.faq details[open] summary::after { transform: rotate(45deg); }
.faq .a { padding: 0 16px 16px; color: var(--ink-soft); }

/* ---------- reklamy (placeholdery AdSense) ---------- */
.ad-slot { margin: 22px auto; min-height: 90px; display:flex; align-items:center; justify-content:center; border:1px dashed var(--line); border-radius:var(--radius-s); background: var(--surface-2); color: var(--muted); font: 600 .75rem/1 var(--mono); letter-spacing:.1em; text-transform:uppercase; }
.ad-slot[data-fmt="inarticle"] { min-height: 110px; }

/* ---------- stopka ---------- */
.site-footer { background: var(--surface); border-top:1px solid var(--line); margin-top: clamp(40px,7vw,80px); }
.foot-grid { display:grid; gap: var(--gap); grid-template-columns: repeat(auto-fit, minmax(min(100%,180px),1fr)); padding-block: clamp(30px,5vw,48px); }
.foot-grid h4 { font-size:.82rem; text-transform:uppercase; letter-spacing:.08em; color:var(--muted); margin-bottom:.8em; }
.foot-grid ul { list-style:none; margin:0; padding:0; display:grid; gap:8px; }
.foot-grid a { color:var(--ink-soft); text-decoration:none; font-size:.92rem; }
.foot-grid a:hover { color: var(--iris); }
.foot-brand p { color:var(--muted); font-size:.9rem; max-width:32ch; }
.foot-bottom { border-top:1px solid var(--line); padding-block:18px; display:flex; flex-wrap:wrap; gap:10px 18px; justify-content:space-between; align-items:center; font-size:.85rem; color:var(--muted); }

/* ---------- baner cookies ---------- */
.cookie-bar { position:fixed; inset:auto 12px 12px; z-index:80; max-width: 520px; margin-inline:auto; background:var(--surface); border:1px solid var(--line); border-radius:var(--radius); box-shadow: var(--shadow-2); padding:16px; display:none; }
.cookie-bar.show { display:block; }
.cookie-bar p { margin:0 0 12px; font-size:.9rem; color:var(--ink-soft); }
.cookie-bar .btn-row { gap:8px; }

/* ---------- pomocnicze ---------- */
.split { display:grid; gap: var(--gap); }
@media (min-width: 880px){ .split--3070 { grid-template-columns: 1fr 320px; align-items:start; } }
.stack > * + * { margin-top: 14px; }
.divider { height:1px; background:var(--line); border:0; margin: clamp(28px,5vw,48px) 0; }
.center { text-align:center; }
.badges { display:flex; flex-wrap:wrap; gap:8px; }
.badge { font:700 .76rem/1 var(--mono); color:var(--ink-soft); background:var(--surface-2); border:1px solid var(--line); border-radius:999px; padding:.45em .7em; }
.kicker { font:700 .8rem/1 var(--mono); letter-spacing:.1em; text-transform:uppercase; color:var(--coral); }
.toast { position:fixed; left:50%; bottom:22px; transform:translateX(-50%) translateY(20px); background:var(--ink); color:var(--paper); padding:.7em 1.1em; border-radius:999px; font-size:.9rem; font-weight:600; opacity:0; pointer-events:none; transition:.25s; z-index:90; }
.toast.show { opacity:1; transform:translateX(-50%) translateY(0); }
.related-grid { grid-template-columns: repeat(auto-fill, minmax(min(100%,230px),1fr)); }
.tablewrap { overflow-x:auto; border:1px solid var(--line); border-radius:var(--radius-s); }
table.data { width:100%; border-collapse:collapse; font-size:.92rem; }
table.data th, table.data td { text-align:left; padding:10px 12px; border-bottom:1px solid var(--line); }
table.data th { background:var(--surface-2); font-weight:700; }
table.data tr:last-child td { border-bottom:0; }