.gallery-filter {
    display: flex;
    justify-content: center;
    gap: 1rem;
    flex-wrap: wrap;
}

.filter-btn {
    padding: 0.75rem 1.5rem;
    background-color: #f5f5f5;
    color: #333;
    border: 2px solid #ddd;
    border-radius: 4px;
    cursor: pointer;
    font-size: 1rem;
    font-weight: 500;
    transition: all 0.3s ease;
}

.filter-btn:hover {
    background-color: #e0e0e0;
    border-color: #999;
}

.filter-btn.active {
    background-color: #333;
    color: white;
    border-color: #333;
}

.gallery-container {
    display: grid;
    grid-template-columns: repeat(3, 1fr);
    gap: 10px;
    margin: 0;
    width: 100%;
    padding: 0;
}

.gallery-item {
    cursor: pointer;
    overflow: hidden;
    border-radius: 0;
    transition: all 0.3s ease;
    text-decoration: none !important;
    border: none !important;
    outline: none !important;
    display: block;
    box-shadow: none !important;
}

.gallery-item.hidden {
    display: none;
}

.gallery-item:hover {
    transform: scale(1.02);
}

.gallery-item:focus {
    outline: none !important;
    border: none !important;
}

a.gallery-item {
    border-bottom: none !important;
}

.gallery-item img {
    width: 100%;
    height: auto;
    max-height: 90vh;
    object-fit: contain;
    display: block;
    background-color: transparent;
}

/* Lightbox */
.lightbox {
    display: none;
    position: fixed;
    z-index: 999;
    top: 0;
    left: 0;
    width: 100%;
    height: 100%;
    background-color: rgba(0, 0, 0, 0.95);
    animation: fadeIn 0.3s;
}

.lightbox.active {
    display: flex;
    align-items: center;
    justify-content: center;
}

.lightbox-content {
    position: relative;
    max-width: calc(100vw - 80px);
    max-height: calc(100vh - 80px);
    display: flex;
    align-items: center;
    justify-content: center;
}

.lightbox-img {
    max-width: 100%;
    max-height: 100%;
    width: auto;
    height: auto;
    object-fit: contain;
    display: block;
}

.lightbox-close {
    position: absolute;
    top: 20px;
    right: 40px;
    color: #fff;
    font-size: 40px;
    cursor: pointer;
    z-index: 1000;
}

.lightbox-nav {
    position: absolute;
    top: 50%;
    transform: translateY(-50%);
    color: #fff;
    font-size: 30px;
    cursor: pointer;
    padding: 10px 20px;
    background-color: rgba(0, 0, 0, 0.5);
    border-radius: 4px;
    transition: background-color 0.3s;
}

.lightbox-nav:hover {
    background-color: rgba(0, 0, 0, 0.8);
}

.lightbox-prev {
    left: 20px;
}

.lightbox-next {
    right: 20px;
}

@keyframes fadeIn {
    from { opacity: 0; }
    to { opacity: 1; }
}

/* Responzivní design */
@media (max-width: 768px) {
    .gallery-container {
        grid-template-columns: repeat(2, 1fr);
        gap: 10px;
    }
    
    .gallery-item img {
        height: 200px;
        background-color: transparent;
    }
}

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