body {
    font-family: Arial, sans-serif;
    margin: 0;
    padding: 0;
}

header {
    background: #333;
    color: white;
    padding: 1rem;
}

nav {
    display: flex;
    justify-content: space-between;
    align-items: center;
}

.menu {
    display: flex;
    gap: 20px;
}

.menu a {
    color: white;
    text-decoration: none;
}

main {
    padding: 20px;
}

.products {
    display: grid;
    grid-template-columns: repeat(auto-fill, minmax(200px, 1fr));
    gap: 20px;
}

.product-card {
    border: 1px solid #ddd;
    padding: 15px;
    border-radius: 5px;
}

.product-card button {
    background: #007bff;
    color: white;
    border: none;
    padding: 5px 10px;
    margin: 5px;
    cursor: pointer;
}

.login-container {
    max-width: 400px;
    margin: 50px auto;
}

input {
    width: 100%;
    padding: 10px;
    margin: 10px 0;
}

button {
    padding: 10px 20px;
}

#test-users {
    margin-top: 30px;
    background: #f0f0f0;
    padding: 15px;
    border-radius: 5px;
}