body, html {
    margin: 0;
    padding: 0;
    width: 100%;
    height: 100%;
    font-family: Arial, sans-serif;
    color: white;
    background: url('https://pbs.twimg.com/media/EDgg3o0WsAEhkce.jpg') no-repeat center center fixed;
    background-size: cover;
}

.container {
    display: flex;
    flex-direction: column;
    align-items: center;
    justify-content: center;
    text-align: center;
    height: 100%;
}

header {
    margin-top: 20px;
}

.logo {
    width: 150px;
}

main {
    display: flex;
    flex-direction: column;
    align-items: center;
    justify-content: center;
    margin-top: 20px;
}

#sphere-container {
    width: 300px;
    height: 300px;
    margin-bottom: 20px;
}

/* Card de bienvenida */
.card {
    background: rgba(0, 0, 0, 0.7);
    color: white;
    padding: 20px;
    border-radius: 10px;
    width: 90%;
    max-width: 400px;
    box-shadow: 0 4px 10px rgba(0, 0, 0, 0.5);
    text-align: center;
}

.card h1 {
    font-size: 1.5rem;
    margin-bottom: 10px;
}

.card p {
    font-size: 1rem;
    margin-bottom: 20px;
    line-height: 1.5;
}

.start-button {
    text-decoration: none;
    color: white;
    font-size: 1rem;
    padding: 10px 20px;
    background: #007BFF;
    border: none;
    border-radius: 5px;
    transition: 0.3s ease-in-out;
}

.start-button:hover {
    background: #0056b3;
}