.sig-feed-container {
    display: grid;
    gap: 15px;
    margin: 20px 0;
}

.sig-cols-2 { grid-template-columns: repeat(2, 1fr); }
.sig-cols-3 { grid-template-columns: repeat(3, 1fr); }
.sig-cols-4 { grid-template-columns: repeat(4, 1fr); }

@media (max-width: 768px) {
    .sig-cols-3, .sig-cols-4 {
        grid-template-columns: repeat(2, 1fr);
    }
}

@media (max-width: 480px) {
    .sig-feed-container {
        grid-template-columns: 1fr;
    }
}

.sig-feed-item {
    position: relative;
    overflow: hidden;
    aspect-ratio: 1 / 1;
    border-radius: 8px;
    box-shadow: 0 4px 6px rgba(0,0,0,0.1);
    transition: transform 0.3s ease;
}

.sig-feed-item:hover {
    transform: translateY(-5px);
}

.sig-feed-item img {
    width: 100%;
    height: 100%;
    object-fit: cover;
    display: block;
}

.sig-overlay {
    position: absolute;
    top: 0;
    left: 0;
    width: 100%;
    height: 100%;
    background: rgba(0,0,0,0.5);
    display: flex;
    align-items: center;
    justify-content: center;
    opacity: 0;
    transition: opacity 0.3s ease;
}

.sig-feed-item:hover .sig-overlay {
    opacity: 1;
}

.sig-icon {
    font-size: 24px;
    color: white;
}