#start_page {
    position: fixed;
    top: 0;
    left: 0;
    width: 100%;
    height: 100%;
    background: linear-gradient(135deg, #667eea 0%, #764ba2 100%);
    display: flex;
    justify-content: center;
    align-items: center;
    z-index: 10000;
    opacity: 1;
    transition: opacity 0.5s ease-out;
}

#start_page.hidden {
    opacity: 0;
    pointer-events: none;
}

#start_page_img {
    width: 200px;
    height: auto;
    animation: pulse 2s infinite;
}

@keyframes pulse {
    0% { transform: scale(1); }
    50% { transform: scale(1.1); }
    100% { transform: scale(1); }
}

/* Responsivo */
@media (max-width: 768px) {
    #start_page_img {
        width: 150px;
    }
}