<svg xmlns="http://www.w3.org/2000/svg" viewBox="0 0 100 100" width="512" height="512">
  <defs>
    <radialGradient id="bg" cx="35%" cy="35%" r="70%">
      <stop offset="0%"   stop-color="#241627"/>
      <stop offset="100%" stop-color="#2A1B2E"/>
    </radialGradient>
  </defs>
  <circle cx="50" cy="50" r="48" fill="url(#bg)"/>
  <circle cx="50" cy="50" r="45" fill="none" stroke="#F0A03C" stroke-opacity="0.35" stroke-width="1.5"/>
  <circle cx="50" cy="50" r="43" fill="none" stroke="white" stroke-opacity="0.08" stroke-width="1"/>
  <text x="50" y="66" text-anchor="middle"
    font-family="system-ui,-apple-system,BlinkMacSystemFont,sans-serif"
    font-weight="900" font-size="40" fill="white" letter-spacing="-1">OC</text>
</svg>