/* Style for the disabled start button */
#start-game-btn:disabled {
    opacity: 0.6;
    cursor: not-allowed;
    background-color: #555;
}

/* Page blocker to prevent early interaction */
#page-blocker {
    position: fixed;
    top: 0;
    left: 0;
    right: 0;
    bottom: 0;
    background-color: rgba(0, 0, 0, 0.5);
    z-index: 9999;
    display: flex;
    justify-content: center;
    align-items: center;
    color: white;
    font-size: 1.5em;
}

/* Loading spinner */
.spinner {
    border: 4px solid rgba(255, 255, 255, 0.3);
    border-radius: 50%;
    border-top: 4px solid white;
    width: 30px;
    height: 30px;
    animation: spin 1s linear infinite;
    margin-right: 10px;
}

@keyframes spin {
    0% { transform: rotate(0deg); }
    100% { transform: rotate(360deg); }
}