body {
    font-family: Arial, sans-serif;
    line-height: 1.6;
    margin: 0;
    padding: 0;
    background-color: #f4f4f4;
    color: #333;
}

header {
    background: #333;
    color: #fff;
    padding: 1rem 0;
    text-align: center;
}

header nav ul {
    list-style: none;
    padding: 0;
}

header nav ul li {
    display: inline;
}

header nav a {
    color: #fff;
    text-decoration: none;
    padding: 0.5rem 1rem;
}

main {
    padding: 2rem;
    max-width: 800px;
    margin: auto;
    background: #fff;
    box-shadow: 0 0 10px rgba(0, 0, 0, 0.1);
    margin-top: 2rem;
}

footer {
    text-align: center;
    padding: 1rem;
    margin-top: 2rem;
    color: #fff;
    background: #333;
}

abbr {
    cursor: help;
}

details {
    margin: 1.5rem 0;
    padding: 1rem;
    border: 1px solid #ddd;
    border-radius: 5px;
    background: #f9f9f9;
}

summary {
    cursor: pointer;
    font-weight: bold;
    padding: 0.5rem;
    user-select: none;
}

summary:hover {
    background: #e9e9e9;
    border-radius: 3px;
}

#jitsi-container {
    width: 100%;
    height: 500px;
    margin-top: 1rem;
    border-radius: 5px;
}