/* Plagát — jedna A4, jeden QR kód */

:root {
  --bg: #eceff3;
  --panel: #fff;
  --fg: #1a1d21;
  --fg-soft: #666e78;
  --line: #d8dde4;
  --brand: #1f5fbf;
  --brand-ink: #fff;
  --err: #b3261e;
}

@media (prefers-color-scheme: dark) {
  :root {
    --bg: #15181c; --panel: #1e2228; --fg: #e8eaed; --fg-soft: #9aa3ad;
    --line: #333a43; --brand: #5b9bf5; --brand-ink: #0d1116; --err: #ef9a93;
  }
}

* { box-sizing: border-box; }

body {
  margin: 0;
  padding: 0 0 40px;
  background: var(--bg);
  color: var(--fg);
  font: 16px/1.5 system-ui, "Segoe UI", Roboto, Arial, sans-serif;
}

.top {
  max-width: 560px;
  margin: 0 auto;
  padding: 22px 16px 6px;
}

.top h1 { margin: 0 0 4px; font-size: 1.3rem; }
.sub { margin: 0 0 18px; color: var(--fg-soft); font-size: .9rem; }

.f { display: grid; gap: 6px; margin-bottom: 14px; font-size: .85rem; color: var(--fg-soft); }
.f em { font-style: normal; }

.inp {
  width: 100%;
  min-height: 46px;
  padding: 10px 12px;
  background: var(--panel);
  border: 1px solid var(--line);
  border-radius: 11px;
  color: var(--fg);
  font: inherit;
  resize: vertical;
}

.inp:focus { outline: 2px solid var(--brand); outline-offset: -1px; }

.btns { display: grid; grid-template-columns: 1fr 1fr; gap: 10px; margin: 18px 0 10px; }

.btn {
  display: inline-grid;
  place-items: center;
  min-height: 50px;
  padding: 0 16px;
  border: 1px solid var(--brand);
  border-radius: 12px;
  background: var(--brand);
  color: var(--brand-ink);
  font: inherit;
  font-weight: 600;
  cursor: pointer;
}

.err { margin: 4px 0; color: var(--err); font-size: .9rem; }
.hint { margin: 14px 0 0; color: var(--fg-soft); font-size: .84rem; }
.hint a { color: var(--brand); }

/* ---------------------------------------------------------------- náhľad */

.stage { display: grid; justify-content: center; padding: 16px; }

/* náhľad sa zmenšuje cez transform, obal mu drží miesto v rozložení */
.page-wrap { width: calc(210mm * var(--s, .5)); height: calc(297mm * var(--s, .5)); }

.page {
  position: relative;
  width: 210mm;
  height: 297mm;
  background: #fff;
  color: #111;
  transform: scale(var(--s, .5));
  transform-origin: top left;
  box-shadow: 0 2px 16px rgba(0, 0, 0, .25);
  overflow: hidden;
}

.p-text, .p-under, .p-qr { position: absolute; text-align: center; }
.p-text { font-weight: 700; white-space: pre-line; }
.p-qr svg { display: block; width: 100%; height: 100%; }

.busy {
  position: fixed;
  inset: 0;
  display: grid;
  place-items: center;
  background: rgba(0, 0, 0, .45);
}

.busy-box { padding: 18px 26px; background: var(--panel); border-radius: 12px; font-weight: 600; }

[hidden] { display: none !important; }

/* ------------------------------------------------------------------ tlač */

@page { size: A4 portrait; margin: 0; }

@media print {
  body { background: #fff; padding: 0; }
  .no-print, .top { display: none !important; }
  .stage { display: block; padding: 0; }
  .page-wrap { width: auto; height: auto; }
  .page { transform: none; box-shadow: none; }
}