<svg xmlns="http://www.w3.org/2000/svg" width="1080" height="1920" viewBox="0 0 1080 1920" role="img" aria-labelledby="title desc">
  <title id="title">官网竖版宣传图占位图</title>
  <desc id="desc">请替换为正式宣传图片</desc>
  <defs>
    <linearGradient id="background" x1="0" y1="0" x2="1" y2="1">
      <stop offset="0" stop-color="#111a3a"/>
      <stop offset="0.55" stop-color="#402265"/>
      <stop offset="1" stop-color="#10172d"/>
    </linearGradient>
    <radialGradient id="glow">
      <stop offset="0" stop-color="#dba7ff" stop-opacity=".55"/>
      <stop offset="1" stop-color="#dba7ff" stop-opacity="0"/>
    </radialGradient>
  </defs>
  <rect width="1080" height="1920" fill="url(#background)"/>
  <circle cx="850" cy="360" r="500" fill="url(#glow)"/>
  <circle cx="160" cy="1420" r="420" fill="url(#glow)" opacity=".45"/>
  <g fill="#fff" text-anchor="middle" font-family="Arial, sans-serif">
    <text x="540" y="820" font-size="76" font-weight="700">OFFICIAL WEBSITE</text>
    <text x="540" y="910" font-size="34" opacity=".72">Replace this poster with your artwork</text>
  </g>
</svg>
