:root {
  --bg: #f6f7f9; --card: #ffffff; --text: #16181d; --muted: #5d6470; --border: #d9dde3;
  --accent: #2f5bd3; --accent-text: #ffffff; --error: #b3261e; --notice: #1d6b3a;
  color-scheme: light dark;
}
@media (prefers-color-scheme: dark) {
  :root { --bg: #0f1115; --card: #181b21; --text: #e8eaee; --muted: #9aa3b0; --border: #2c313a; --accent: #7fa2ff; --accent-text: #0f1115; --error: #ff8a80; --notice: #7ddc9c; }
}
* { box-sizing: border-box; }
body { margin: 0; min-height: 100vh; background: var(--bg); color: var(--text); font: 16px/1.5 system-ui, -apple-system, "Segoe UI", sans-serif; display: flex; justify-content: center; align-items: flex-start; padding: 48px 16px; }
.card { width: 100%; max-width: 440px; background: var(--card); border: 1px solid var(--border); border-radius: 12px; padding: 28px; }
h1 { font-size: 1.4rem; margin: 0 0 16px; }
h2 { font-size: 1.05rem; margin: 24px 0 8px; }
p { margin: 0 0 12px; }
.muted { color: var(--muted); font-size: .92rem; }
.error { color: var(--error); }
.notice { color: var(--notice); }
form { display: flex; flex-direction: column; gap: 12px; margin: 0 0 12px; }
label { display: flex; flex-direction: column; gap: 4px; font-size: .92rem; }
input { font: inherit; padding: 10px 12px; border: 1px solid var(--border); border-radius: 8px; background: transparent; color: inherit; }
input:focus-visible, button:focus-visible, a:focus-visible { outline: 2px solid var(--accent); outline-offset: 2px; }
button, .button { font: inherit; padding: 10px 14px; border-radius: 8px; border: 1px solid var(--border); background: transparent; color: inherit; cursor: pointer; text-align: center; text-decoration: none; display: block; width: 100%; margin: 0 0 8px; }
button.primary { background: var(--accent); color: var(--accent-text); border-color: var(--accent); }
button.link { border: none; padding: 0; width: auto; display: inline; color: var(--accent); text-decoration: underline; margin: 0; }
button:disabled { opacity: .6; cursor: progress; }
.row { display: flex; gap: 8px; flex-direction: row; }
.row button { flex: 1; }
details { margin: 0 0 12px; }
code.secret { font-size: 1.05rem; letter-spacing: .08em; word-break: break-all; }
ol.codes { columns: 2; }
.hidden { display: none; }
ul { padding-left: 20px; }
li { margin-bottom: 6px; }
img.qr { display: block; margin: 8px auto 16px; background: #fff; padding: 8px; border-radius: 8px; image-rendering: pixelated; }
.badge { display: inline-block; padding: 0 8px; border-radius: 999px; font-size: .8rem; border: 1px solid var(--border); }
.badge.good { color: var(--notice); }
.badge.warn { color: var(--error); }