:root{--bg:#f4f5f7;--card:#fff;--fg:#1d2330;--muted:#6b7280;--accent:#1f5eff;--accent-fg:#fff;--border:#d8dce3;--err-bg:#fdecec;--err-fg:#a61b1b}
@media (prefers-color-scheme:dark){:root{--bg:#12151b;--card:#1b2029;--fg:#e8ebf0;--muted:#9aa3b2;--accent:#5b8cff;--accent-fg:#0b0e13;--border:#2d3442;--err-bg:#3a1d1f;--err-fg:#ffb4b4}}
*{box-sizing:border-box}
html,body{margin:0;min-height:100%}
body{background:var(--bg);color:var(--fg);font:16px/1.45 -apple-system,BlinkMacSystemFont,"Segoe UI",Roboto,"Helvetica Neue",Arial,sans-serif;display:flex;align-items:center;justify-content:center;min-height:100vh;padding:16px}
.card{background:var(--card);border:1px solid var(--border);border-radius:12px;padding:28px 24px;width:100%;max-width:380px}
.brand{font-size:22px;margin:0 0 20px;letter-spacing:.2px}
h2{font-size:17px;margin:0 0 14px;font-weight:600}
label{display:block;font-size:14px;color:var(--muted);margin:12px 0 4px}
input{width:100%;padding:10px 12px;font:inherit;color:var(--fg);background:transparent;border:1px solid var(--border);border-radius:8px}
input:focus{outline:2px solid var(--accent);outline-offset:-1px;border-color:transparent}
button{font:inherit;cursor:pointer}
button[type=submit],.choice{width:100%;margin-top:20px;padding:11px 12px;border:0;border-radius:8px;background:var(--accent);color:var(--accent-fg);font-weight:600}
button:disabled{opacity:.6;cursor:default}
.choices{display:flex;flex-direction:column}
.choice{margin-top:10px}
.link{background:none;border:0;color:var(--muted);margin-top:16px;padding:0;text-decoration:underline}
.err{background:var(--err-bg);color:var(--err-fg);border-radius:8px;padding:9px 12px;font-size:14px;margin-bottom:6px}
.busy{color:var(--muted);margin:16px 0 0}
[hidden]{display:none!important}