:root {
  --bg: #f4f6f9; --card: #ffffff; --ink: #18202b; --muted: #5c6878; --line: #dde3ea;
  --accent: #0f6fde; --accent-ink: #ffffff; --ok: #1d7a3e; --warn: #9a5b00; --warn-bg: #fff6e0;
  --err: #b42318; --err-bg: #fdecea; --form-bg: #fbfcfe; --form-head: #e9eef5; --hl: #e8f1fd;
  --hero1: #0b2545; --hero2: #13315c;
}
@media (prefers-color-scheme: dark) {
  :root {
    --bg: #0e131a; --card: #161d27; --ink: #e6ebf2; --muted: #93a0b2; --line: #2a3442;
    --accent: #4d9bff; --accent-ink: #08111d; --ok: #57c47f; --warn: #f0b44c; --warn-bg: #2b2414;
    --err: #ff8a80; --err-bg: #2d1717; --form-bg: #121922; --form-head: #1d2633; --hl: #172840;
    --hero1: #0a1626; --hero2: #11233a;
  }
}
* { box-sizing: border-box; }
body { margin: 0; background: var(--bg); color: var(--ink); font: 15px/1.5 "Segoe UI", system-ui, -apple-system, Roboto, sans-serif; }
.wrap { max-width: 1120px; margin: 0 auto; padding: 0 16px; }
h1, h2, h3, h4 { line-height: 1.25; }
a { color: var(--accent); }
.muted { color: var(--muted); font-size: 13.5px; }
code { background: var(--form-head); padding: 1px 5px; border-radius: 4px; }

.hero { background: linear-gradient(135deg, var(--hero1), var(--hero2)); color: #fff; padding: 36px 0 28px; margin-bottom: 20px; }
.hero h1 { margin: 0 0 6px; font-size: clamp(26px, 4vw, 38px); }
.hero .accent { color: #8cc4ff; }
.hero .lead { margin: 0 0 14px; font-size: 17px; opacity: .92; }
.badges { display: flex; flex-wrap: wrap; gap: 8px; margin-bottom: 14px; }
.badge { background: rgba(255,255,255,.12); border: 1px solid rgba(255,255,255,.2); padding: 4px 10px; border-radius: 99px; font-size: 13px; }
.ex-list { display: flex; flex-wrap: wrap; gap: 6px; }
.ex-list span { background: rgba(255,255,255,.95); color: #0b2545; font-weight: 600; font-size: 12.5px; padding: 3px 10px; border-radius: 6px; }

.card { background: var(--card); border: 1px solid var(--line); border-radius: 12px; padding: 20px 22px; margin-bottom: 18px; }
.card h2 { margin: 0 0 14px; font-size: 20px; display: flex; align-items: center; gap: 10px; }
.card h3 { margin: 22px 0 8px; font-size: 16px; }
.num { background: var(--accent); color: var(--accent-ink); width: 28px; height: 28px; border-radius: 50%; display: inline-grid; place-items: center; font-size: 15px; flex: none; }

.drop { display: block; border: 2px dashed var(--line); border-radius: 12px; padding: 28px 16px; text-align: center; cursor: pointer; transition: .15s; }
.drop:hover, .drop.over { border-color: var(--accent); background: var(--hl); }
.drop input { display: none; }
.drop strong { font-size: 17px; }
.drop small { display: block; color: var(--muted); margin-top: 4px; }

table { width: 100%; border-collapse: collapse; font-size: 14px; }
th, td { padding: 7px 8px; border-bottom: 1px solid var(--line); text-align: left; vertical-align: top; }
th { font-size: 12.5px; color: var(--muted); font-weight: 600; text-transform: uppercase; letter-spacing: .02em; }
td.n, th.n { text-align: right; white-space: nowrap; font-variant-numeric: tabular-nums; }
.tbl-wrap { overflow-x: auto; }
.st-ok { color: var(--ok); font-weight: 600; }
.st-err { color: var(--err); font-weight: 600; }
.st-warn { color: var(--warn); }
select, input { font: inherit; color: inherit; background: var(--form-bg); border: 1px solid var(--line); border-radius: 7px; padding: 6px 8px; }
input:focus, select:focus { outline: 2px solid var(--accent); outline-offset: 0; }

.row-form { display: flex; flex-wrap: wrap; gap: 12px; align-items: flex-end; margin: 10px 0; }
.row-form label { display: flex; flex-direction: column; gap: 4px; font-size: 13px; color: var(--muted); }
.row-form label.grow { flex: 1 1 260px; }
.row-form label input, .row-form label select { color: var(--ink); }
.btn { background: var(--accent); color: var(--accent-ink); border: 0; border-radius: 8px; padding: 8px 16px; font: inherit; font-weight: 600; cursor: pointer; }
.btn.ghost { background: transparent; color: var(--accent); border: 1px solid var(--accent); }
.btn.small { padding: 3px 10px; font-size: 13px; }
.linkbtn { background: none; border: 0; color: var(--accent); cursor: pointer; font: inherit; padding: 0; text-decoration: underline; }
.actions { display: flex; flex-wrap: wrap; gap: 10px; margin: 14px 0; }

details.howto { margin-top: 14px; border: 1px solid var(--line); border-radius: 10px; padding: 10px 14px; }
details.howto summary { cursor: pointer; font-weight: 600; }
.howto-grid { display: grid; grid-template-columns: repeat(auto-fill, minmax(250px, 1fr)); gap: 12px; margin-top: 10px; }
.howto-grid h4 { margin: 0 0 4px; }
.howto-grid p { margin: 0; font-size: 13.5px; }

/* wynik */
.big { display: grid; grid-template-columns: repeat(auto-fit, minmax(150px, 1fr)); gap: 10px; margin-bottom: 18px; }
.tile { border: 1px solid var(--line); border-radius: 10px; padding: 12px 14px; background: var(--form-bg); }
.tile .lbl { font-size: 12.5px; color: var(--muted); text-transform: uppercase; letter-spacing: .03em; }
.tile .val { font-size: 24px; font-weight: 700; font-variant-numeric: tabular-nums; }
.tile.main { background: var(--hl); border-color: var(--accent); }
.tile.main .val { color: var(--accent); font-size: 28px; }

/* replika formularza */
.pit { border: 1.5px solid var(--ink); background: var(--form-bg); margin-bottom: 16px; font-size: 13.5px; }
.pit .sec { background: var(--form-head); font-weight: 800; font-size: 16px; padding: 6px 10px; border-bottom: 1.5px solid var(--ink); }
.pit .sec small { font-weight: 400; font-size: 12px; color: var(--muted); margin-left: 6px; }
.pit table { font-size: 13px; }
.pit th { text-transform: none; letter-spacing: 0; color: var(--ink); font-weight: 600; text-align: center; border: 1px solid var(--line); background: var(--form-head); font-size: 12px; }
.pit td { border: 1px solid var(--line); }
.pit .poz { font-size: 11px; color: var(--muted); display: block; }
.pit .kw { font-size: 16px; font-weight: 700; text-align: right; display: block; font-variant-numeric: tabular-nums; white-space: nowrap; }
.pit .hl { background: var(--hl); }
.pit .grid2 { display: grid; grid-template-columns: 1fr 230px; }
.pit .grid2 > div { border-bottom: 1px solid var(--line); padding: 6px 10px; }
.pit .grid2 > div:nth-child(odd) { border-right: 1px solid var(--line); }
.pit .opis { font-size: 12px; color: var(--muted); }

.alert { border-radius: 9px; padding: 10px 14px; margin: 8px 0; font-size: 14px; }
.alert.warn { background: var(--warn-bg); border: 1px solid var(--warn); }
.alert.err { background: var(--err-bg); border: 1px solid var(--err); }
.alert.info { background: var(--hl); border: 1px solid var(--accent); }
.steps { margin: 8px 0 0; padding-left: 20px; }
.rules li { margin-bottom: 6px; }
.disclaimer { font-size: 13px; color: var(--muted); border-top: 1px solid var(--line); padding-top: 10px; }
.info h2 { font-size: 18px; }
footer { padding: 10px 16px 30px; text-align: center; }

.modal { position: fixed; inset: 0; background: rgba(0,0,0,.45); display: grid; place-items: center; padding: 16px; z-index: 10; }
.modal[hidden] { display: none; }
.modal .box { background: var(--card); border-radius: 12px; padding: 20px; max-width: 640px; width: 100%; max-height: 90vh; overflow: auto; }
.toast { position: fixed; bottom: 18px; left: 50%; transform: translateX(-50%); background: var(--ink); color: var(--bg); padding: 10px 18px; border-radius: 9px; z-index: 20; }

@media (max-width: 640px) {
  .card { padding: 16px 14px; }
  .pit .grid2 { grid-template-columns: 1fr 130px; }
  .pit .kw { font-size: 14px; }
  .pit-e thead { display: none; }
  .pit-e tr, .pit-e td { display: block; width: 100%; }
  .pit-e td[data-l]::before { content: attr(data-l); display: block; font-size: 11.5px; color: var(--muted); }
}
@media print {
  .hero, #krok1, #krok2, .actions, #tx-box, footer, .info { display: none !important; }
  body { background: #fff; color: #000; }
  .card { border: 0; padding: 0; }
}