<!-- Classic three-column layout with header and footer -->
<div class="page">
  <header>Header</header>
  <nav>Navigation</nav>
  <main>Main Content</main>
  <aside>Sidebar</aside>
  <footer>Footer</footer>
</div>

.page {
  display: grid;
  grid-template-columns: 200px 1fr 200px;
  grid-template-rows: auto 1fr auto;
  gap: 20px;
  min-height: 100vh;
}

header {
  grid-column: 1 / -1;  /* span full width */
  background: #333333;
  color: white;
  padding: 20px;
}

nav {
  grid-row: 2;
  grid-column: 1;
  background: #f5f5f5;
  padding: 20px;
  overflow-y: auto;
}

main {
  grid-row: 2;
  grid-column: 2;
  padding: 20px;
}

aside {
  grid-row: 2;
  grid-column: 3;
  background: #f9f9f9;
  padding: 20px;
}

footer {
  grid-column: 1 / -1;
  background: #333333;
  color: white;
  padding: 20px;
  text-align: center;
}

<!-- Responsive: stack on mobile -->
@media (max-width: 768px) {
  .page {
    grid-template-columns: 1fr;
    grid-template-rows: auto auto auto auto auto;
  }

  nav, aside {
    grid-column: 1;
  }

  nav { grid-row: 2; }
  main { grid-row: 3; }
  aside { grid-row: 4; }
  footer { grid-row: 5; }
}

<!-- Hero image + featured article + grid of articles -->
<div class="magazine">
  <img class="hero" src="hero.jpg">
  <article class="featured">Featured Story</article>
  <article>Article</article>
  <article>Article</article>
  <article>Article</article>
</div>

.magazine {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  grid-auto-rows: 300px;
  gap: 20px;
  padding: 20px;
}

.hero {
  grid-column: 1 / -1;  /* full width -->
  width: 100%;
  height: 400px;
  object-fit: cover;
}

.featured {
  grid-column: 1 / 3;  /* spans 2 columns -->
  grid-row: 2;
  background: white;
  padding: 20px;
  border: 1px solid #ddd;
}

article {
  background: white;
  padding: 20px;
  border: 1px solid #ddd;
}

<!-- Result: Hero spans width, featured takes 2/3 column 2 -->
[════════ Hero Image ════════════════]
[═════ Featured (2 cols) ═════] [Art 1]
[Art 2] [Art 3] [Art 4]

<!-- Dashboard with widgets of varying sizes -->
<div class="dashboard">
  <div class="widget">Small</div>
  <div class="widget large">Large</div>
  <div class="widget">Small</div>
  <div class="widget">Small</div>
</div>

.dashboard {
  display: grid;
  grid-template-columns: repeat(12, 1fr);
  grid-auto-rows: 200px;
  gap: 15px;
  padding: 20px;
}

.widget {
  grid-column: span 4;  /* 1/3 width -->
  background: white;
  border-radius: 8px;
  padding: 20px;
  box-shadow: 0 2px 8px rgba(0,0,0,0.1);
}

.widget.large {
  grid-column: span 6;  /* 1/2 width -->
  grid-row: span 2;     /* double height -->
}

<!-- Responsive -->
@media (max-width: 768px) {
  .dashboard {
    grid-template-columns: repeat(6, 1fr);
  }

  .widget {
    grid-column: span 3;  /* 1/2 width on tablet -->
  }

  .widget.large {
    grid-column: span 6;  /* full width -->
  }
}

@media (max-width: 480px) {
  .dashboard {
    grid-template-columns: 1fr;
  }

  .widget, .widget.large {
    grid-column: 1;
  }
}

<!-- Uneven column widths for different content types -->
<div class="asymmetric">
  <aside class="sidebar">Sidebar</aside>
  <main class="content">Main</main>
</div>

.asymmetric {
  display: grid;
  grid-template-columns: 280px 1fr;
  gap: 30px;
  padding: 40px;
}

.sidebar {
  background: #f5f5f5;
  padding: 20px;
  border-radius: 8px;
  height: fit-content;  /* sticky-like behavior -->
}

.content {
  padding: 20px;
}

<!-- Three-column asymmetric -->
.three-column {
  display: grid;
  grid-template-columns: 1fr 2fr 1fr;  /* 1:2:1 ratio -->
  gap: 30px;
}

<!-- Two-column with narrow right -->
.two-column-right {
  display: grid;
  grid-template-columns: 1fr 300px;
  gap: 30px;
}

<!-- Automatically adapts columns based on space -->
.responsive {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(250px, 1fr));
  gap: 20px;
  padding: 20px;
}

.item {
  background: white;
  border: 1px solid #eeeeee;
  border-radius: 8px;
  padding: 20px;
  min-height: 200px;
}

<!-- No media queries needed! -->
<!-- 1200px+ → 4 columns
     900px  → 3 columns
     600px  → 2 columns
     300px  → 1 column -->

/* More aggressive: smaller items per column -->
.tight-grid {
  grid-template-columns: repeat(auto-fit, minmax(150px, 1fr));
}

/* More breathing room: larger items -->
.spacious-grid {
  grid-template-columns: repeat(auto-fit, minmax(400px, 1fr));
}

<!-- Fixed sidebar + auto-fitting content columns -->
<div class="mixed">
  <aside>Sidebar</aside>
  <div class="content-grid">
    <article>Article</article>
    <!-- many articles -->
  </div>
</div>

.mixed {
  display: grid;
  grid-template-columns: 250px 1fr;
  gap: 20px;
}

.content-grid {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(300px, 1fr));
  gap: 20px;
}

<!-- Result: fixed sidebar + responsive content grid -->

/* Header + responsive body -->
.app {
  display: grid;
  grid-template-columns: 1fr;
  grid-template-rows: auto 1fr;
}

.app-header {
  grid-column: 1;
  background: white;
  border-bottom: 1px solid #ddd;
}

.app-body {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(200px, 1fr));
  gap: 15px;
  padding: 20px;
}