body {
    font-family: Arial, sans-serif;
    line-height: 1.6;
    margin: 0;
    padding: 20px;
    background: #f9f9f9;
    color: #333;
}

header {
    text-align: center;
    margin-bottom: 20px;
    border-bottom: 1px solid #ddd;
    padding-bottom: 10px;
}

nav {
    text-align: center;
    margin-bottom: 20px;
}

nav a {
    margin: 0 10px;
    text-decoration: none;
    color: #0066cc;
}

nav a:hover {
    text-decoration: underline;
}

.product {
    background: white;
    padding: 15px;
    margin-bottom: 15px;
    border-radius: 8px;
    box-shadow: 0 2px 5px rgba(0,0,0,0.1);
}

.btn {
    display: inline-block;
    background: #0066cc;
    color: white;
    padding: 10px 20px;
    text-decoration: none;
    border-radius: 5px;
    font-weight: bold;
}

.btn:hover {
    background: #0055aa;
}

footer {
    text-align: center;
    margin-top: 40px;
    font-size: 0.9em;
    color: #666;
    border-top: 1px solid #ddd;
    padding-top: 10px;
}