<svg xmlns="http://www.w3.org/2000/svg" viewBox="0 0 64 64" width="64" height="64">
  <defs>
    <linearGradient id="g" x1="0" y1="0" x2="1" y2="1">
      <stop offset="0" stop-color="#3b82f6"/>
      <stop offset="1" stop-color="#06b6d4"/>
    </linearGradient>
  </defs>
  <rect width="64" height="64" rx="14" fill="#0f172a"/>
  <text x="50%" y="50%" dy=".07em" text-anchor="middle" dominant-baseline="middle"
        font-family="JetBrains Mono, monospace" font-size="38" font-weight="700"
        fill="url(#g)">S</text>
</svg>

