Responsive Grid Layout

<div class="responsive-grid-container">
  <div class="responsive-grid">
    <div class="grid-item">1</div>
    <div class="grid-item">2</div>
    <div class="grid-item">3</div>
    <div class="grid-item">4</div>
    <div class="grid-item">5</div>
    <div class="grid-item">6</div>
  </div>
</div>

.responsive-grid-container {
  max-width: 1200px;
  margin: 0 auto;
  padding: 20px;
}

.responsive-grid {
  display: grid;
  /* Auto-fit creates as many columns as possible with minimum width of 200px */
  grid-template-columns: repeat(auto-fit, minmax(200px, 1fr));
  gap: 20px;
  width: 100%;
}

.grid-item {
  background: linear-gradient(135deg, #42e695, #3bb2b8);
  color: white;
  border-radius: 10px;
  padding: 30px;
  font-size: 20px;
  font-weight: bold;
  display: flex;
  justify-content: center;
  align-items: center;
  box-shadow: 0 5px 15px rgba(0, 0, 0, 0.1);
  transition: transform 0.3s ease, box-shadow 0.3s ease;
}

.grid-item:hover {
  transform: translateY(-5px);
  box-shadow: 0 8px 20px rgba(0, 0, 0, 0.2);
}

/* Item spanning options (examples) */
/* For larger layouts you can make items span multiple columns or rows */
.grid-item.span-2 {
  grid-column: span 2;
}

.grid-item.span-row-2 {
  grid-row: span 2;
}

/* Different breakpoints for different screen sizes */
@media (max-width: 992px) {
  .responsive-grid {
    grid-template-columns: repeat(auto-fit, minmax(180px, 1fr));
    gap: 15px;
  }
}

@media (max-width: 576px) {
  .responsive-grid {
    grid-template-columns: repeat(auto-fit, minmax(150px, 1fr));
    gap: 10px;
  }
  
  .grid-item {
    padding: 20px;
    font-size: 16px;
  }
  
  /* On small screens make all spanning items normal */
  .grid-item.span-2, .grid-item.span-row-2 {
    grid-column: auto;
    grid-row: auto;
  }
}

/* Dark mode styles */
@media (prefers-color-scheme: dark) {
  .grid-item {
    background: linear-gradient(135deg, #1e9277, #2e7b85);
    box-shadow: 0 5px 15px rgba(0, 0, 0, 0.3);
  }
}

/* Alternative fixed column patterns */

/* Fixed 3-column grid that collapses to 2 then 1 column */
.fixed-grid {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 20px;
}

@media (max-width: 992px) {
  .fixed-grid {
    grid-template-columns: repeat(2, 1fr);
  }
}

@media (max-width: 576px) {
  .fixed-grid {
    grid-template-columns: 1fr;
  }
}

/* Grid with named areas for layout control */
.grid-with-areas {
  display: grid;
  grid-template-columns: repeat(4, 1fr);
  grid-template-rows: auto;
  gap: 20px;
  grid-template-areas:
    "header header header header"
    "sidebar main main main"
    "sidebar footer footer footer";
}

.header { grid-area: header; }
.sidebar { grid-area: sidebar; }
.main { grid-area: main; }
.footer { grid-area: footer; }

@media (max-width: 768px) {
  .grid-with-areas {
    grid-template-columns: 1fr;
    grid-template-areas:
      "header"
      "main"
      "sidebar"
      "footer";
  }
}