:root{--bg:#f4f6fb;--card:#fff;--fg:#14213d;--muted:#5b6785;--line:#d7dcea;--accent:#2f5bea;--accent-fg:#fff;--bad:#b3261e;--bad-bg:#fdecea;--ok:#16794c}
@media (prefers-color-scheme:dark){:root{--bg:#0e1424;--card:#171f36;--fg:#e8ecf8;--muted:#98a3c2;--line:#2c3757;--accent:#6c8cff;--accent-fg:#0b1020;--bad:#ff8a80;--bad-bg:#3a1c1c;--ok:#5fd8a0}}
*{box-sizing:border-box}
body{margin:0;min-height:100vh;display:grid;place-items:center;padding:16px;background:var(--bg);color:var(--fg);font:16px/1.5 system-ui,-apple-system,"Segoe UI",Roboto,sans-serif}
.card{width:100%;max-width:400px;background:var(--card);border:1px solid var(--line);border-radius:14px;padding:28px;box-shadow:0 8px 30px rgba(20,33,61,.08)}
.card.wide{max-width:560px}
.brand{display:flex;align-items:center;gap:10px;margin-bottom:18px;font-weight:600;color:var(--muted)}
.logo{display:grid;place-items:center;width:34px;height:34px;border-radius:9px;background:var(--accent);color:var(--accent-fg);font-weight:800}
h1{font-size:1.4rem;margin:0 0 4px}h2{font-size:1.05rem;margin:24px 0 8px}
p{margin:.4em 0 1em}.muted{color:var(--muted);font-size:.92rem}.ok{color:var(--ok)}
label{display:block;margin:14px 0 0;font-size:.9rem;font-weight:600}
input{display:block;width:100%;margin-top:6px;padding:11px 12px;font:inherit;color:inherit;background:transparent;border:1px solid var(--line);border-radius:9px}
input:focus-visible,button:focus-visible,a:focus-visible{outline:3px solid var(--accent);outline-offset:2px}
button{width:100%;margin-top:18px;padding:12px;font:inherit;font-weight:600;color:var(--accent-fg);background:var(--accent);border:0;border-radius:9px;cursor:pointer}
button.secondary{background:transparent;color:var(--fg);border:1px solid var(--line)}
a{color:var(--accent)}
.alert{padding:10px 12px;border-radius:9px;color:var(--bad);background:var(--bad-bg);font-size:.92rem}
.qr{display:block;margin:12px auto;background:#fff;padding:8px;border-radius:10px}
code{font-family:ui-monospace,Menlo,Consolas,monospace;word-break:break-all}
.codes{list-style:none;padding:0;display:grid;grid-template-columns:1fr 1fr;gap:8px}.codes li{padding:8px;border:1px dashed var(--line);border-radius:8px;text-align:center}
.sessions{list-style:none;padding:0}.sessions li{display:flex;justify-content:space-between;align-items:center;gap:12px;padding:10px 0;border-top:1px solid var(--line)}
.sessions form{margin:0}.sessions button{margin:0;width:auto;padding:8px 12px}
.hidden-frame{position:absolute;width:0;height:0;border:0;visibility:hidden}