body {
    font-family: sans-serif;
    display: flex;
    justify-content: center;
    align-items: center;
    height: 100vh;
    background-color: #f0f0f0;
}

#game-container {
    text-align: center;
    background-color: white;
    padding: 2rem;
    border-radius: 10px;
    box-shadow: 0 4px 8px rgba(0,0,0,0.1);
}

.hidden {
    display: none;
}

input {
    padding: 0.5rem;
    margin-right: 0.5rem;
}

button {
    padding: 0.5rem 1rem;
    cursor: pointer;
}

.login-btn {
    padding: 0.8rem 1.5rem;
    font-size: 1.2rem;
    margin: 0 0.5rem;
}

.choice-btn {
    font-size: 2rem;
    margin: 0 1rem;
    border: 2px solid transparent;
    border-radius: 10px;
}

.choice-btn:hover {
    border-color: #ddd;
}

#result-display {
    margin-top: 1rem;
    font-size: 1.2rem;
    font-weight: bold;
}