:root {
  --bg: #f4f6fa;
  --surface: #fff;
  --text: #14181f;
  --muted: #5d6675;
  --border: #d5dbe5;
  --accent: #2563eb;
  --accent-text: #fff;
  --danger: #b42318;
  color-scheme: light dark;
}

@media (prefers-color-scheme: dark) {
  :root {
    --bg: #0e1116;
    --surface: #171b22;
    --text: #e8ecf2;
    --muted: #9aa4b2;
    --border: #2d3441;
    --accent: #5b8def;
    --accent-text: #0e1116;
    --danger: #ff8a80;
  }
}

* { box-sizing: border-box; }

body {
  margin: 0;
  min-height: 100dvh;
  display: grid;
  place-items: start center;
  padding: 1rem;
  background: var(--bg);
  color: var(--text);
  font: 16px/1.5 system-ui, -apple-system, "Segoe UI", sans-serif;
}

.card {
  width: min(100%, 34rem);
  margin-block: 1rem;
  padding: 1.5rem;
  background: var(--surface);
  border: 1px solid var(--border);
  border-radius: 1rem;
}

h1 { margin: 0 0 .25rem; font-size: 1.5rem; }
h2 { margin: 1.5rem 0 .5rem; font-size: 1.05rem; }
.muted { color: var(--muted); }
.error { color: var(--danger); font-weight: 600; }
.mono { font-family: ui-monospace, Menlo, monospace; word-break: break-all; }

label { display: block; margin: 1rem 0 .25rem; font-weight: 600; }
label.checkbox { display: flex; gap: .5rem; align-items: center; font-weight: 400; }

input[type="text"], input[type="password"], select, textarea {
  width: 100%;
  padding: .65rem .75rem;
  font: inherit;
  color: inherit;
  background: var(--bg);
  border: 1px solid var(--border);
  border-radius: .6rem;
}

textarea { resize: vertical; font: .85rem ui-monospace, Menlo, monospace; word-break: break-all; }

:focus-visible { outline: 2px solid var(--accent); outline-offset: 2px; }

.row { display: flex; gap: .5rem; align-items: center; flex-wrap: wrap; margin-top: .5rem; }
.row input { flex: 1; min-width: 0; }

button {
  padding: .65rem 1rem;
  font: inherit;
  font-weight: 600;
  color: var(--accent-text);
  background: var(--accent);
  border: 1px solid var(--accent);
  border-radius: .6rem;
  cursor: pointer;
}

button.secondary { color: var(--text); background: transparent; border-color: var(--border); }
button:disabled { opacity: .45; cursor: not-allowed; }

.qr { width: min(100%, 15rem); margin: 1rem auto; background: #fff; border-radius: .6rem; }
.qr svg { display: block; width: 100%; height: auto; }

.details { display: grid; grid-template-columns: max-content 1fr; gap: .5rem 1rem; margin: 1rem 0; }
.details dt { color: var(--muted); }
.details dd { margin: 0; font-weight: 600; }

footer { margin-top: 1.5rem; }
[hidden] { display: none !important; }