body {
    font-family: -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, Helvetica, Arial, sans-serif;
    margin: 0;
    background-color: #f0f2f5;
    color: #333;
}

header {
    background-color: white;
    padding: 2rem;
    text-align: center;
    box-shadow: 0 2px 4px rgba(0, 0, 0, 0.1);
}

main {
    display: flex;
    flex-wrap: wrap;
    justify-content: center;
    padding: 2rem;
}

.card {
    background-color: white;
    border-radius: 8px;
    box-shadow: 0 4px 12px rgba(0, 0, 0, 0.1);
    margin: 1rem;
    padding: 1.5rem;
    width: 300px;
    cursor: pointer;
    transition: transform 0.2s;
}

.card:hover {
    transform: translateY(-5px);
}

.card h2 {
    margin-top: 0;
}

.modal {
    position: fixed;
    z-index: 1;
    left: 0;
    top: 0;
    width: 100%;
    height: 100%;
    overflow: auto;
    background-color: rgba(0,0,0,0.4);
    display: flex;
    justify-content: center;
    align-items: center;
}

.modal-content {
    background-color: #fefefe;
    padding: 20px;
    border: 1px solid #888;
    width: 80%;
    max-width: 800px;
    height: 80%;
    position: relative;
}

.close-button {
    color: #aaa;
    position: absolute;
    top: 10px;
    right: 25px;
    font-size: 28px;
    font-weight: bold;
    cursor: pointer;
}

iframe {
    width: 100%;
    height: 100%;
    border: none;
}