<div class="window-frame">
  <!-- Cityscape -->
  <div class="cityscape">
    <div class="starfield" id="starfield" data-stars="50"></div>
    <div class="buildings-far"></div>
    <div class="buildings-mid"></div>
    <div class="buildings-near"></div>
    <div class="ambient-light"></div>
  </div>

  <!-- Window effects -->
  <div class="window-grime"></div>
  <div class="glass-reflection"></div>
</div>
