:root{color-scheme:light dark;--bg:#f4f6fb;--card:#fff;--ink:#172033;--muted:#5b6475;--line:#d6dbe6;--accent:#1d4ed8}
@media (prefers-color-scheme:dark){:root{--bg:#0b1020;--card:#131a2e;--ink:#e6e9f2;--muted:#9aa3b8;--line:#2a3350;--accent:#7aa2ff}}
*{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}
.login{width:100%;max-width:380px;background:var(--card);border:1px solid var(--line);border-radius:14px;padding:28px}
h1{margin:0;font-size:22px}.sub{margin:4px 0 20px;color:var(--muted)}
label{display:block;font-weight:600;margin:12px 0 4px}input{width:100%;padding:10px 12px;border:1px solid var(--line);border-radius:8px;background:transparent;color:inherit;font:inherit}
button{margin-top:18px;width:100%;padding:11px;border:0;border-radius:8px;background:var(--accent);color:#fff;font:inherit;font-weight:600;cursor:pointer}
input:focus-visible,button:focus-visible{outline:3px solid #f59e0b;outline-offset:2px}
.error{color:#dc2626;margin:10px 0 0}.note{margin:18px 0 0;color:var(--muted);font-size:13px}code{font-size:12px}