body {
  font-family: Arial, sans-serif;
  margin: 0;
  padding: 0;
  background: #f8f8f8;
  color: #333;
}
header {
  background-color: #222;
  padding: 15px;
  color: white;
  text-align: center;
}
nav a {
  margin: 0 10px;
  color: #fff;
  text-decoration: none;
}
nav a:hover {
  text-decoration: underline;
}
main {
  padding: 20px;
}
.catalog {
  display: grid;
  grid-template-columns: repeat(auto-fill, minmax(220px, 1fr));
  gap: 20px;
}
.item {
  background: white;
  padding: 15px;
  border-radius: 8px;
  box-shadow: 0 0 5px rgba(0,0,0,0.1);
  text-align: center;
}
.item img {
  width: 100%;
  height: auto;
  border-radius: 6px;
}
.item a {
  display: inline-block;
  margin-top: 10px;
  text-decoration: none;
  background: #007bff;
  color: white;
  padding: 6px 12px;
  border-radius: 4px;
}
.item a:hover {
  background: #0056b3;
}