:root{--bg:#FBFAF8;--fg:#1c1b19;--muted:#6b6862;--card:#fff;--line:#e4e1db;--accent:#2f5bd8;--err:#b3261e}
@media (prefers-color-scheme:dark){:root{--bg:#161513;--fg:#f1efea;--muted:#a09c94;--card:#1f1e1b;--line:#33312d;--accent:#7ea0ff;--err:#ff8a80}}
*{box-sizing:border-box}
body{margin:0;min-height:100vh;display:grid;place-items:center;background:var(--bg);color:var(--fg);font:16px/1.5 system-ui,-apple-system,"Segoe UI",Roboto,sans-serif;padding:16px}
.card{width:100%;max-width:400px;background:var(--card);border:1px solid var(--line);border-radius:12px;padding:28px 24px}
h1{font-size:22px;margin:0 0 8px}
.muted{color:var(--muted);margin:0 0 16px}
.small{font-size:14px}
label{display:block;font-weight:600;margin:14px 0 6px}
input{width:100%;font:inherit;padding:11px 12px;border:1px solid var(--line);border-radius:8px;background:var(--bg);color:var(--fg)}
input:focus-visible,button:focus-visible,a:focus-visible{outline:2px solid var(--accent);outline-offset:2px}
button{width:100%;margin-top:18px;font:inherit;font-weight:600;padding:12px;border:0;border-radius:8px;background:var(--accent);color:#fff;cursor:pointer}
button:disabled{opacity:.6;cursor:wait}
.msg{color:var(--err);margin:12px 0 0}
a{color:var(--accent)}
.steps{padding-left:20px;margin:0 0 8px}
.qr{display:block;margin:8px auto 12px;border-radius:8px;background:#fff;image-rendering:pixelated}
details{margin:8px 0 4px}
summary{cursor:pointer;color:var(--accent);font-size:14px}
.key{font:600 20px/1.4 ui-monospace,Menlo,Consolas,monospace;letter-spacing:.06em;word-break:break-all;background:var(--bg);border:1px solid var(--line);border-radius:8px;padding:12px;margin:8px 0;user-select:all}