:root{--bg:#fafaf8;--card:#fff;--text:#0a0a0a;--muted:#5a5955;--line:#e8e8ed;--accent:#8e1a1c;--err:#c0261d}
@media (prefers-color-scheme:dark){:root{--bg:#141413;--card:#1e1e1c;--text:#f3f2ee;--muted:#a3a29b;--line:#34332f}}
*{box-sizing:border-box}
body{margin:0;min-height:100vh;display:flex;align-items:center;justify-content:center;background:var(--bg);color:var(--text);font:15px/1.5 -apple-system,"Segoe UI",Helvetica,Arial,sans-serif;padding:16px}
.card{width:100%;max-width:380px;background:var(--card);border:1px solid var(--line);border-radius:14px;padding:28px}
h1{font-size:1.25rem;margin:0 0 4px}
.sub{color:var(--muted);margin:0 0 20px;font-size:.9rem}
label{display:block;font-size:.8rem;color:var(--muted);margin:12px 0 4px}
input{width:100%;padding:11px 12px;border:1px solid var(--line);border-radius:8px;background:transparent;color:var(--text);font-size:1rem}
input:focus{outline:2px solid var(--accent);outline-offset:1px}
button{width:100%;margin-top:18px;padding:12px;border:0;border-radius:8px;background:var(--accent);color:#fff;font-size:1rem;font-weight:600;cursor:pointer}
button:disabled{opacity:.6;cursor:default}
.err{color:var(--err);font-size:.85rem;margin-top:12px;min-height:1.2em}
.hide{display:none}
.key{font-family:ui-monospace,Consolas,monospace;word-break:break-all;background:var(--bg);border:1px solid var(--line);border-radius:8px;padding:10px;font-size:.85rem;user-select:all}
.hint{font-size:.8rem;color:var(--muted)}