body {
  font-family: 'Segoe UI', sans-serif;
  margin: 0;
  background: #f9f9f9;
  color: #333;
}

header {
  background: white;
  padding: 20px;
  text-align: center;
  box-shadow: 0 2px 4px rgba(0,0,0,0.1);
}

nav a {
  margin: 0 15px;
  text-decoration: none;
  color: #0077cc;
}

section {
  padding: 60px 20px;
  max-width: 800px;
  margin: auto;
}

.grid {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(250px, 1fr));
  gap: 20px;
}

footer {
  text-align: center;
  padding: 20px;
  background: #eee;
}