:root{--bg:#f3f5f8;--panel:#fff;--text:#16263a;--muted:#647689;--line:#dbe3ec;--accent:#1f5fae;--bad:#a23b2e;color-scheme:light dark}
@media(prefers-color-scheme:dark){:root{--bg:#0f1720;--panel:#16212d;--text:#e4ebf3;--muted:#93a4b6;--line:#26364a;--accent:#5a9bf0;--bad:#f08a7c}}
*{box-sizing:border-box}body{margin:0;min-height:100vh;display:grid;place-items:center;background:var(--bg);color:var(--text);font:16px/1.5 system-ui,-apple-system,"Segoe UI",sans-serif;padding:16px}
form{background:var(--panel);border:1px solid var(--line);border-radius:14px;padding:28px;width:100%;max-width:360px}
h1{font-size:22px;margin:0 0 4px}p{color:var(--muted);margin:0 0 20px;font-size:14px}label{font-size:14px;font-weight:600}
input{font:inherit;width:100%;padding:11px 12px;border:1px solid var(--line);border-radius:8px;background:transparent;color:inherit;margin:6px 0 16px}
button{font:inherit;font-weight:650;width:100%;padding:12px;border:0;border-radius:8px;background:var(--accent);color:#fff;cursor:pointer}button:disabled{opacity:.6;cursor:wait}
#err{color:var(--bad);font-size:14px;min-height:21px;margin-top:12px}