:root{color-scheme:light dark;--bg: #fbfbf9;--fg: #1a1a1a;--muted: #6b6b6b;--line: #d8d8d2;--accent: #15803d;--error: #b91c1c}@media (prefers-color-scheme: dark){:root{--bg: #16181a;--fg: #ececec;--muted: #9a9a9a;--line: #32363a;--accent: #4ade80;--error: #f87171}}*{box-sizing:border-box}body{margin:0;background:var(--bg);color:var(--fg);font:16px/1.5 system-ui,-apple-system,Segoe UI,sans-serif;display:grid;place-items:center;min-height:100vh;padding:1rem}.card{width:100%;max-width:24rem;border:1px solid var(--line);border-radius:12px;padding:1.5rem;background:color-mix(in srgb,var(--bg) 88%,white)}h1{font-size:1.25rem;margin:0 0 1rem}label{display:block;font-size:.85rem;color:var(--muted);margin-top:.75rem}input{width:100%;padding:.6rem;margin-top:.25rem;border:1px solid var(--line);border-radius:8px;background:var(--bg);color:var(--fg);font-size:1rem}button{width:100%;margin-top:1rem;padding:.65rem;border:0;border-radius:8px;background:var(--accent);color:#fff;font-size:1rem;cursor:pointer}button:disabled{opacity:.6;cursor:default}button.link{background:none;color:var(--muted);text-decoration:underline;font-size:.85rem}.error{color:var(--error);font-size:.9rem}.muted{color:var(--muted);font-size:.9rem}