body {
    font-family: Arial, sans-serif;
    margin: 0;
    padding: 0;
    background-color: #f5f5f5;
    color: #333;
}

header {
    text-align: center;
    padding: 20px;
    background-color: #fff;
    box-shadow: 0 2px 5px rgba(0,0,0,0.1);
}

h1 {
    margin: 0;
    font-size: 2rem;
}

.built-with {
    display: block;
    margin-top: 10px;
    color: #0066cc;
    text-decoration: none;
    font-size: 0.9rem;
}

.built-with:hover {
    text-decoration: underline;
}

.main {
    max-width: 800px;
    margin: 0 auto;
    padding: 20px;
}

.group-list {
    display: flex;
    flex-direction: column;
    gap: 20px;
}

.group-item {
    background: white;
    padding: 20px;
    border-radius: 8px;
    box-shadow: 0 2px 10px rgba(0,0,0,0.1);
    display: flex;
    flex-direction: column;
    gap: 10px;
}

.group-item h2 {
    margin: 0;
    font-size: 1.2rem;
    font-weight: bold;
}

.group-link {
    display: inline-block;
    background-color: #0066cc;
    color: white;
    padding: 10px 20px;
    border-radius: 5px;
    text-decoration: none;
    font-weight: bold;
    text-align: center;
    transition: background-color 0.3s;
}

.group-link:hover {
    background-color: #0055aa;
}

footer {
    text-align: center;
    padding: 20px;
    background-color: #fff;
    margin-top: 20px;
    border-top: 1px solid #eee;
}