:root {
  --bg: #f6f7f9; --fg: #16181d; --muted: #5d6470; --card: #ffffff; --line: #d9dde3;
  --accent: #1f5fbf; --accent-fg: #ffffff; --danger: #b42318; --notice-bg: #fff6db; --error-bg: #fde8e7;
  --focus: #f0b400;
}
@media (prefers-color-scheme: dark) {
  :root { --bg: #111317; --fg: #e8eaee; --muted: #a2a9b4; --card: #1a1d23; --line: #2e333b;
          --accent: #5b9bff; --accent-fg: #0b0d10; --danger: #ff7b72; --notice-bg: #3a3215; --error-bg: #3d1b1a; }
}
* { box-sizing: border-box; }
body { margin: 0; background: var(--bg); color: var(--fg);
       font: 16px/1.5 system-ui, -apple-system, "Segoe UI", Roboto, sans-serif; }
.top { display: flex; align-items: center; gap: 1rem; padding: .75rem 1rem; border-bottom: 1px solid var(--line); background: var(--card); flex-wrap: wrap; }
.brand { font-weight: 700; color: var(--fg); text-decoration: none; margin-right: auto; }
.top nav { display: flex; gap: 1rem; }
main { max-width: 960px; margin: 0 auto; padding: 1.5rem 1rem 3rem; }
a { color: var(--accent); }
h1 { font-size: 1.5rem; margin: 0 0 1rem; }
h2 { font-size: 1.15rem; margin: 0 0 .5rem; }
.card { background: var(--card); border: 1px solid var(--line); border-radius: 8px; padding: 1.25rem; margin-bottom: 1rem; }
.card.narrow { max-width: 420px; margin: 2rem auto; }
label { display: block; margin: .75rem 0 .25rem; font-weight: 600; }
label.check { font-weight: 400; display: flex; gap: .5rem; align-items: center; }
input[type=text], input:not([type]), input[type=password] {
  width: 100%; padding: .6rem .7rem; font: inherit; color: var(--fg); background: var(--bg);
  border: 1px solid var(--line); border-radius: 6px; }
button { margin-top: 1rem; padding: .6rem 1rem; font: inherit; font-weight: 600; border: 0; border-radius: 6px;
         background: var(--accent); color: var(--accent-fg); cursor: pointer; }
button.secondary { background: transparent; color: var(--accent); border: 1px solid var(--line); margin-top: 0; padding: .35rem .7rem; font-weight: 500; }
button.danger { background: var(--danger); color: #fff; }
button.link { background: none; color: var(--accent); padding: 0; margin: 0; font-weight: 500; }
:focus-visible { outline: 3px solid var(--focus); outline-offset: 2px; }
form.inline { display: inline; }
form.row { display: flex; flex-wrap: wrap; gap: .5rem; align-items: end; }
form.row label { width: 100%; }
form.row input { max-width: 12rem; }
.error { background: var(--error-bg); padding: .6rem .8rem; border-radius: 6px; }
.notice { background: var(--notice-bg); padding: .6rem .8rem; border-radius: 6px; }
.muted { color: var(--muted); }
.badge { font-size: .8rem; border: 1px solid var(--line); border-radius: 999px; padding: .1rem .5rem; margin-right: .4rem; }
.qr svg { width: 220px; height: 220px; background: #fff; border-radius: 6px; }
.kv { display: grid; grid-template-columns: max-content 1fr; gap: .25rem 1rem; }
.kv dt { color: var(--muted); }
.kv dd { margin: 0; }
code.secret { word-break: break-all; font-size: 1rem; }
ol.codes { columns: 2; font-size: 1.1rem; padding-left: 1.5rem; }
ol.codes code { letter-spacing: .05em; }
.actions { display: flex; gap: .4rem; flex-wrap: wrap; }
table { width: 100%; border-collapse: collapse; font-size: .92rem; }
th, td { text-align: left; padding: .5rem .4rem; border-bottom: 1px solid var(--line); vertical-align: top; }
td.ua { max-width: 18rem; overflow-wrap: anywhere; color: var(--muted); }
@media (max-width: 640px) {
  table { display: block; overflow-x: auto; }
  ol.codes { columns: 1; }
}