.gallery-container {
    padding: 100px 5% 50px;
    min-height: 100vh;
    background: var(--light-bg);
}

.gallery-header {
    text-align: center;
    margin-bottom: 4rem;
    padding: 3rem;
    background: var(--gradient);
    border-radius: 30px;
    color: var(--white);
}

.gallery-header h1 {
    font-size: 3rem;
    color: white;
    margin-bottom: 0.5rem;
}

.gallery-categories {
    display: flex;
    justify-content: center;
    gap: 1rem;
    margin-bottom: 2rem;
    flex-wrap: wrap;
}

.cat-btn {
    padding: 0.8rem 2rem;
    border: none;
    background: var(--white);
    color: var(--text-color);
    border-radius: 30px;
    cursor: pointer;
    transition: all 0.3s ease;
    font-size: 1rem;
    box-shadow: 0 2px 10px rgba(0,0,0,0.1);
    border: 1px solid rgba(30,144,255,0.2);
    transition: all 0.3s;
}

.cat-btn.active,
.cat-btn:hover {
    background: var(--primary-color);
    color: var(--white);
    transform: translateY(-2px);
}

.photo-grid {
    display: grid;
    grid-template-columns: repeat(auto-fill, minmax(250px, 1fr));
    gap: 20px;
    padding: 20px;
}

.photo-item {
    position: relative;
    border-radius: 15px;
    overflow: hidden;
    background: var(--white);
    box-shadow: 0 2px 5px rgba(0,0,0,0.1);
    transition: all 0.3s ease;
}

.photo-content {
    position: relative;
    width: 100%;
    height: 0;
    padding-bottom: 75%; /* Tỷ lệ 4:3 */
    overflow: hidden;
    border-radius: 8px;
}

.photo-content img {
    position: absolute;
    top: 0;
    left: 0;
    width: 100%;
    height: 100%;
    object-fit: cover; /* Đảm bảo ảnh lấp đầy container mà không bị méo */
    transition: transform 0.3s ease;
}

/* New hover effects and animations */
.photo-item:hover {
    transform: translateY(-10px);
}

.photo-info {
    position: absolute;
    bottom: 0;
    left: 0;
    right: 0;
    padding: 2rem;
    background: linear-gradient(transparent, rgba(0,0,0,0.8));
    color: var(--white);
    transform: translateY(100%);
    transition: transform 0.3s ease;
}

.photo-item:hover .photo-info {
    transform: translateY(0);
}

.photo-item:hover .photo-content img {
    transform: scale(1.1);
}

/* Preview Modal */
.preview-modal {
    position: fixed;
    top: 0;
    left: 0;
    width: 100%;
    height: 100%;
    background: rgba(0,0,0,0.9);
    display: none;
    justify-content: center;
    align-items: center;
    z-index: 1000;
}

#preview-image {
    max-width: 90%;
    max-height: 90vh;
    object-fit: contain;
}

.close-preview {
    position: absolute;
    top: 20px;
    right: 20px;
    color: white;
    font-size: 2.5rem;
    cursor: pointer;
}

.nav-btn {
    position: absolute;
    top: 50%;
    transform: translateY(-50%);
    background: var(--primary-color);
    opacity: 0.8;
    color: white;
    border: none;
    padding: 1rem;
    cursor: pointer;
    font-size: 1.5rem;
    border-radius: 50%;
    transition: background 0.3s ease;
}

.prev-btn { left: 20px; }
.next-btn { right: 20px; }

.nav-btn:hover {
    opacity: 1;
    background: var(--accent-color);
}

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

/* Responsive */
@media (max-width: 768px) {
    .gallery-header h1 {
        font-size: 2rem;
    }
    
    .cat-btn {
        padding: 0.6rem 1.5rem;
        font-size: 0.9rem;
    }
    
    .photo-grid {
        grid-template-columns: repeat(auto-fill, minmax(250px, 1fr));
    }
}

.preview-modal img {
    max-width: 90vw;
    max-height: 90vh;
    object-fit: contain;
}