:root {
  color-scheme: light dark;
  --bg: #fff;
  --fg: #1a1a1a;
  --muted: #666;
  --line: #ccc;
  --accent: #0b57d0;
  --error: #b3261e;
  --error-bg: #fdecea;
}
@media (prefers-color-scheme: dark) {
  :root {
    --bg: #121212;
    --fg: #e6e6e6;
    --muted: #9a9a9a;
    --line: #444;
    --accent: #8ab4f8;
    --error: #f2b8b5;
    --error-bg: #3a1f1d;
  }
}

* { box-sizing: border-box; }
/* Author display rules below would otherwise beat the UA's [hidden] rule. */
[hidden] { display: none !important; }

body {
  margin: 0 auto;
  padding: 16px;
  max-width: 900px;
  font: 16px/1.45 system-ui, -apple-system, "Segoe UI", Roboto, sans-serif;
  background: var(--bg);
  color: var(--fg);
}

header { position: relative; }
h1 { margin: 0 0 4px; font-size: 1.6rem; }
header p { margin: 0 0 16px; color: var(--muted); }
nav { position: absolute; top: 0; right: 0; }
.lang { padding: 2px 8px; font-size: 0.85rem; }
.lang[aria-pressed="true"] { background: var(--accent); color: var(--bg); border-color: var(--accent); }

main { display: grid; gap: 24px; }
@media (min-width: 720px) {
  main { grid-template-columns: 1fr 340px; align-items: start; }
}

fieldset { border: 0; padding: 0; margin: 0; display: grid; gap: 4px; }
fieldset:disabled { opacity: 0.6; }
label { margin-top: 10px; font-size: 0.9rem; }
label small { color: var(--error); }
input {
  width: 100%;
  padding: 8px;
  font: inherit;
  color: var(--fg);
  background: var(--bg);
  border: 1px solid var(--line);
  border-radius: 4px;
}
input:focus { outline: 2px solid var(--accent); outline-offset: 1px; }

button {
  padding: 8px 14px;
  font: inherit;
  color: var(--fg);
  background: var(--bg);
  border: 1px solid var(--line);
  border-radius: 4px;
  cursor: pointer;
}
button:hover:not(:disabled) { border-color: var(--accent); }
button:disabled { cursor: default; opacity: 0.7; }

/* The grid sits on an inner div, not on <details>: a display value on
   <details> itself makes some engines show the folded content. */
#more { margin-top: 14px; }
#more > summary { cursor: pointer; color: var(--muted); font-size: 0.9rem; }
/* The field names stay in the text so a search for "BIC" finds them.
   The hierarchy comes from the label's weight, not from dimming the
   list: --muted only just clears 4.5:1, so any opacity below ~0.9
   drops the names under AA (measured 3.85:1 at 0.7). */
#more > summary span { font-weight: 600; }
#more > summary small { font-size: inherit; }
#more-fields { display: grid; gap: 4px; }

#result { position: sticky; top: 16px; }
#status { color: var(--muted); }
#error {
  margin: 0 0 12px;
  padding: 8px 12px;
  color: var(--error);
  background: var(--error-bg);
  border-radius: 4px;
  overflow-wrap: anywhere;
}
#qr { width: 100%; max-width: 320px; }
#qr svg { display: block; width: 100%; height: auto; }
#actions { display: flex; flex-wrap: wrap; gap: 8px; margin-top: 12px; }
details { margin-top: 12px; font-size: 0.85rem; }
summary { cursor: pointer; color: var(--muted); }
pre {
  margin: 8px 0 0;
  padding: 8px;
  overflow-x: auto;
  border: 1px solid var(--line);
  border-radius: 4px;
  font-size: 0.8rem;
}

footer { margin-top: 32px; padding-top: 12px; border-top: 1px solid var(--line); color: var(--muted); font-size: 0.85rem; }
footer a { color: var(--accent); }