body {
    font-family: sans-serif;
    margin: 0;
    padding: 0;
    background: #f8f8f8;
    color: #333;
}
header {
    background: #fff;
    padding: 20px;
    display: flex;
    justify-content: space-between;
    align-items: center;
}
.hero {
    background: #2c3e50;
    color: white;
    text-align: center;
    padding: 40px 20px;
}
.hero .btn {
    display: inline-block;
    background: orange;
    color: #fff;
    padding: 10px 20px;
    text-decoration: none;
    margin-top: 20px;
}
.catalog {
    padding: 20px;
    background: #fff;
}
.catalog ul {
    display: flex;
    list-style: none;
    padding: 0;
    gap: 20px;
}
.catalog li {
    background: #eee;
    padding: 10px;
    flex: 1;
    text-align: center;
}
footer {
    text-align: center;
    padding: 20px;
    background: #ddd;
}