f46ff653943de8538aeda98689d055a5ea775f98df2ae7b871fc560c8200d022

Generate an SVG illustration for the following request.

STRICT response rules:
- Respond with ONLY a single <svg>...</svg> element
- Use viewBox="0 0 400 400"
- No <script>, no <foreignObject>, no <iframe>, no <image>
- No external href, no event handlers (on*), no javascript:
- Max 20000 bytes total
- NO prose, NO markdown fences, NO explanations, NO comments
- Output must start with `<svg` and end with `</svg>`

Request: RED CIRCLE WITH 75% SMALLER BLACK CIRCLE INSIDE