:root{--bg:#0f1115;--card:#181b22;--text:#e8eaf0;--muted:#8a909c;--accent:#f0a500;--danger:#e05d5d;color-scheme:dark}*{box-sizing:border-box}body{margin:0;background:var(--bg);color:var(--text);font-family:system-ui,-apple-system,Segoe UI,Roboto,sans-serif;font-size:16px;line-height:1.5}a{color:var(--accent);text-decoration:none}.topbar{display:flex;justify-content:space-between;align-items:center;padding:12px 16px;border-bottom:1px solid #242832}.topbar nav a{margin-left:16px}.brand{font-weight:700;color:var(--text)}.container{max-width:480px;margin:0 auto;padding:16px}.card{background:var(--card);border-radius:12px;padding:20px;margin-bottom:16px}label{display:block;margin:12px 0 4px;color:var(--muted);font-size:14px}input{border-radius:8px;border:1px solid #2c313c;background:#0f1115;color:var(--text)}button,input{width:100%;padding:12px;font-size:16px}button{margin-top:16px;border:0;border-radius:8px;background:var(--accent);color:#111;font-weight:600;cursor:pointer}button:disabled{opacity:.6}.error{color:var(--danger);margin-top:12px}.muted{color:var(--muted);font-size:14px}