* {
    margin: 0;
    padding: 0;
    box-sizing: border-box;
    font-family: 'Segoe UI', Tahoma, Geneva, Verdana, sans-serif;
}

body {
    background-color: #f4f4f4;
    padding: 20px;
}

header {
    text-align: center;
    margin-bottom: 40px;
}

header h1 {
    color: #333;
    margin-bottom: 10px;
}

/* Filter Buttons Styling */
.filter-buttons {
    margin-top: 20px;
}

.btn {
    border: none;
    padding: 10px 20px;
    margin: 5px;
    cursor: pointer;
    background-color: #ddd;
    border-radius: 5px;
    transition: all 0.3s ease;
    font-size: 16px;
}

.btn:hover, .btn.active {
    background-color: #333;
    color: white;
}

/* Gallery Grid Layout */
.gallery-container {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(300px, 1fr));
    gap: 15px;
    max-width: 1200px;
    margin: 0 auto;
}

.image-card {
    position: relative;
    overflow: hidden;
    border-radius: 8px;
    box-shadow: 0 4px 8px rgba(0,0,0,0.1);
    cursor: pointer;
    height: 250px; 
}

.image-card img {
    width: 100%;
    height: 100%;
    object-fit: cover;
    transition: transform 0.4s ease;
    display: block;
}


.image-card:hover img {
    transform: scale(1.1);
}

.image-card.hide {
    display: none;
}

.lightbox {
    display: none; 
    position: fixed;
    z-index: 1000;
    padding-top: 60px;
    left: 0;
    top: 0;
    width: 100%;
    height: 100%;
    background-color: rgba(0, 0, 0, 0.9);
}

.lightbox-content {
    margin: auto;
    display: block;
    width: 80%;
    max-width: 700px;
    max-height: 80vh;
    object-fit: contain;
    border-radius: 5px;
    animation-name: zoom;
    animation-duration: 0.6s;
}

@keyframes zoom {
    from {transform:scale(0)} 
    to {transform:scale(1)}
}

/* Close Button */
.close-btn {
    position: absolute;
    top: 20px;
    right: 35px;
    color: #f1f1f1;
    font-size: 40px;
    font-weight: bold;
    cursor: pointer;
    transition: 0.3s;
}

.close-btn:hover {
    color: #bbb;
}

/* Navigation Buttons */
.prev, .next {
    cursor: pointer;
    position: absolute;
    top: 50%;
    width: auto;
    padding: 16px;
    margin-top: -50px;
    color: white;
    font-weight: bold;
    font-size: 30px;
    transition: 0.3s ease;
    user-select: none;
}

.next {
    right: 10px;
}
.prev {
    left: 10px;
}

.prev:hover, .next:hover {
    background-color: rgba(0,0,0,0.8);
    border-radius: 3px;
}

/* Responsive adjustments */
@media screen and (max-width: 700px) {
    .lightbox-content {
        width: 100%;
    }
}