:root {
    --primary-color: #ffffff;
    --secondary-color: #dddddd;
    --background-color: #121212;
    --accent-color: #00aaff;
    --overlay-bg: rgba(0, 0, 0, 0.9);
}

* {
    margin: 0;
    padding: 0;
    box-sizing: border-box;
}

body {
    font-family: 'Poppins', sans-serif;
    background-color: var(--background-color);
    color: var(--primary-color);
    padding: 40px 60px;
}

.gallery-header {
    text-align: center;
    margin-bottom: 60px;
    animation: slideDown 0.8s ease-out;
}

@keyframes slideDown {
    from {
        opacity: 0;
        transform: translateY(-30px);
    }
    to {
        opacity: 1;
        transform: translateY(0);
    }
}

.gallery-header h1 {
    font-size: 3.5rem;
    font-weight: 600;
    margin-bottom: 10px;
}

.gallery-header p {
    font-size: 1.2rem;
    font-weight: 300;
    color: var(--secondary-color);
    max-width: 800px;
    margin: 0 auto;
}

.photo-grid {
    display: grid;
    grid-template-columns: repeat(auto-fill, minmax(320px, 1fr));
    gap: 35px;
}

.photo-grid .thumbnail {
    position: relative;
    overflow: hidden;
    border-radius: 12px;
    cursor: pointer;
    box-shadow: 0 10px 20px rgba(0, 0, 0, 0.2);
    transition: transform 0.3s ease;
}

.photo-grid .thumbnail:hover {
    transform: scale(1.05);
}

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

.photo-grid .thumbnail:hover img {
    transform: scale(1.1);
}

.photo-grid .thumbnail .overlay {
    position: absolute;
    top: 0;
    left: 0;
    width: 100%;
    height: 100%;
    background: linear-gradient(to top, rgba(0,0,0,0.8), transparent);
    display: flex;
    align-items: flex-end;
    padding: 20px;
    opacity: 0;
    transition: opacity 0.4s ease;
}

.photo-grid .thumbnail:hover .overlay {
    opacity: 1;
}

.photo-grid .thumbnail .overlay span {
    color: var(--primary-color);
    font-size: 1.1rem;
    font-weight: 500;
    transform: translateY(10px);
    transition: transform 0.4s ease;
}

.photo-grid .thumbnail:hover .overlay span {
    transform: translateY(0);
}

.lightbox {
    display: none;
    position: fixed;
    top: 0;
    left: 0;
    width: 100%;
    height: 100%;
    background-color: var(--overlay-bg);
    z-index: 1000;
    justify-content: center;
    align-items: center;
    padding: 30px;
    animation: fadeIn 0.5s ease;
}

.lightbox:target {
    display: flex;
}

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

.lightbox-content {
    position: relative;
    max-width: 90vw;
    max-height: 90vh;
}

.lightbox-content img {
    width: auto;
    height: auto;
    max-width: 100%;
    max-height: 100%;
    border-radius: 8px;
    box-shadow: 0 15px 40px rgba(0,0,0,0.5);
}

.lightbox .close {
    position: absolute;
    top: -40px;
    right: 0;
    color: var(--primary-color);
    font-size: 2.5rem;
    text-decoration: none;
    transition: color 0.3s ease;
}

.lightbox .close:hover {
    color: var(--secondary-color);
}

.lightbox .next, .lightbox .prev {
    position: absolute;
    top: 50%;
    transform: translateY(-50%);
    color: var(--primary-color);
    font-size: 3rem;
    text-decoration: none;
    padding: 10px 20px;
    background: rgba(0,0,0,0.3);
    border-radius: 8px;
    transition: background 0.3s ease;
}

.lightbox .next:hover, .lightbox .prev:hover {
    background: rgba(0,0,0,0.5);
}

.lightbox .next {
    right: -60px;
}

.lightbox .prev {
    left: -60px;
}

.back-link-container {
    text-align: center;
    margin-top: 60px;
}

.back-link {
    display: inline-block;
    padding: 14px 30px;
    background-color: var(--accent-color);
    color: var(--primary-color);
    text-decoration: none;
    border-radius: 50px;
    font-weight: 500;
    font-size: 1.1rem;
    transition: all 0.3s ease;
    box-shadow: 0 5px 15px rgba(0, 170, 255, 0.3);
}

.back-link:hover {
    background-color: #0099e6;
    transform: translateY(-3px);
    box-shadow: 0 8px 20px rgba(0, 170, 255, 0.4);
}