body {
    font-family: -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, Helvetica, Arial, sans-serif;
    margin: 0;
    padding: 0;
    background-color: #f0f2f5;
    color: #1c1e21;
}

header {
    background-color: #fff;
    text-align: center;
    padding: 20px;
    border-bottom: 1px solid #dddfe2;
}

header h1 {
    margin: 0;
    font-size: 2em;
    font-weight: 700;
}

header p {
    margin: 5px 0 0;
    color: #606770;
    font-size: 1.2em;
}

#gallery-container {
    display: grid;
    grid-template-columns: repeat(auto-fill, minmax(200px, 1fr));
    gap: 15px;
    padding: 20px;
    max-width: 1200px;
    margin: 0 auto;
}

.gallery-item {
    position: relative;
    overflow: hidden;
    border-radius: 8px;
    box-shadow: 0 4px 12px rgba(0, 0, 0, 0.1);
    background-color: #fff;
    transition: transform 0.3s ease, box-shadow 0.3s ease;
}

.gallery-item:hover {
    transform: translateY(-5px);
    box-shadow: 0 8px 20px rgba(0, 0, 0, 0.15);
}

.gallery-item .image-container {
    width: 100%;
    padding-top: 177.78%; /* 16:9 Aspect Ratio */
    position: relative;
}

.gallery-item img {
    position: absolute;
    top: 0;
    left: 0;
    width: 100%;
    height: 100%;
    object-fit: cover;
    display: block;
}

.download-btn {
    position: absolute;
    bottom: 10px;
    left: 50%;
    transform: translateX(-50%);
    background-color: rgba(0, 0, 0, 0.7);
    color: white;
    padding: 8px 15px;
    border: none;
    border-radius: 5px;
    cursor: pointer;
    text-decoration: none;
    font-size: 0.9em;
    opacity: 0;
    transition: opacity 0.3s ease;
}

.gallery-item:hover .download-btn {
    opacity: 1;
}