CSS Responsive Web Design

Responsive Principles

Mobile-first approach starts with mobile styles.

Fluid grids use percentages instead of fixed widths.

Flexible images scale with max-width: 100%.

Media queries apply breakpoints for different devices.

Viewport meta tag is essential for mobile.

/* Mobile-first base styles */
.container {
  width: 100%;
  padding: 15px;
}

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

/* Responsive images */
img {
  max-width: 100%;
  height: auto;
}

/* Tablet breakpoint */
@media (min-width: 768px) {
  .container {
    width: 750px;
    margin: 0 auto;
  }

  .grid {
    grid-template-columns: repeat(2, 1fr);
  }
}

/* Desktop breakpoint */
@media (min-width: 1024px) {
  .container {
    width: 1000px;
  }

  .grid {
    grid-template-columns: repeat(3, 1fr);
  }
}

/* Responsive typography */
h1 {
  font-size: clamp(1.5rem, 5vw, 3rem);
}