7357affc52b380c19527820eb92d8f1531c405a1c017b95264a2f15b32f61797

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: A BIG RED CIRCLE WITH 75% SMALLER BLACK CIRCLE INSIDE