body {
  font-family: Arial, sans-serif;
  margin: 0;
  background: #f4f4f4;
}

header {
  background: #222;
  color: white;
  padding: 15px;
}

nav a {
  margin-right: 15px;
  color: #ddd;
  text-decoration: none;
}

nav a.active {
  color: white;
  font-weight: bold;
}

main {
  width: 90%;
  max-width: 1100px;
  margin: 40px auto;
}

.grid {
  display: grid;
  grid-template-columns: repeat(4, 1fr);
  gap: 25px;
}

.item {
  background: white;
  padding: 10px;
  text-align: center;
  border-radius: 6px;
}

.item img {
  width: 100%;
  border-radius: 6px;
}

.item a {
  text-decoration: none;
  color: #0077cc;
}

@media (max-width: 900px) {
  .grid {
    grid-template-columns: repeat(2, 1fr);
  }
}

@media (max-width: 600px) {
  .grid {
    grid-template-columns: 1fr;
  }
}