/* HTML structure:
<div class="grid-container">
  <header class="header">Header</header>
  <nav class="sidebar">Sidebar</nav>
  <main class="content">Main Content</main>
  <aside class="ads">Ads</aside>
  <footer class="footer">Footer</footer>
</div>
*/

.grid-container {
  display: grid;
  grid-template-columns: 200px 1fr 150px; /* Sidebar, Content, Ads */
  grid-template-rows: auto 1fr auto; /* Header, Main Area, Footer */
  grid-template-areas:
    "header header header"
    "sidebar content ads"
    "footer footer footer";
  gap: 10px; /* Gutter between grid items */
  min-height: 100vh; /* Example: Full viewport height */
}

.header { grid-area: header; background-color: #f0f0f0; padding: 20px; text-align: center; }
.sidebar { grid-area: sidebar; background-color: #e0e0e0; padding: 20px; }
.content { grid-area: content; background-color: #d0d0d0; padding: 20px; }
.ads { grid-area: ads; background-color: #c0c0c0; padding: 20px; }
.footer { grid-area: footer; background-color: #b0b0b0; padding: 20px; text-align: center; }

@media (max-width: 768px) {
  .grid-container {
    grid-template-columns: 1fr; /* Single column layout */
    grid-template-rows: auto auto 1fr auto auto; /* Header, Sidebar, Content, Ads, Footer */
    grid-template-areas:
      "header"
      "sidebar"
      "content"
      "ads"
      "footer";
  }
}