:root{--bg:#F4F5F7;--surface:#fff;--ink:#17191E;--muted:#636A78;--line:#E2E5EB;--wb:#7B2FA8;--bad:#C0262D}
@media (prefers-color-scheme:dark){:root{--bg:#101216;--surface:#181B21;--ink:#ECEEF2;--muted:#A0A7B4;--line:#2A2F38;--wb:#C792EC;--bad:#F27A80;color-scheme:dark}}
*{box-sizing:border-box}
body{margin:0;min-height:100vh;display:grid;place-items:center;background:var(--bg);color:var(--ink);
  font:15px/1.5 system-ui,-apple-system,"Segoe UI",Roboto,sans-serif;padding:16px}
.card{width:100%;max-width:380px;background:var(--surface);border:1px solid var(--line);border-radius:14px;padding:24px;display:flex;flex-direction:column;gap:12px}
h1{margin:0;font-size:22px}
form{display:flex;flex-direction:column;gap:8px}
label{font-size:13px;color:var(--muted)}
input{font:inherit;font-size:16px;padding:9px 11px;border:1px solid var(--line);border-radius:8px;background:var(--bg);color:var(--ink)}
button{font:inherit;font-weight:600;margin-top:6px;padding:10px;border:0;border-radius:8px;background:var(--wb);color:#fff;cursor:pointer}
button:focus-visible,input:focus-visible{outline:2px solid var(--wb);outline-offset:2px}
.err{color:var(--bad);margin:0}
.muted{color:var(--muted);margin:0;font-size:14px}
.steps{margin:0;padding-left:20px;font-size:14px;color:var(--muted)}
#qr{align-self:center;background:#fff;padding:10px;border-radius:8px}
.mono{font-family:ui-monospace,Menlo,Consolas,monospace;text-align:center;letter-spacing:.06em;margin:0;word-break:break-all}