:root {
    --bg-color: #ffffff;
    --text-color: #333333;
    --grid-gap: 10px;
    --transition-speed: 0.3s;
}

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

body {
    font-family: 'Inter', -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, Helvetica, Arial, sans-serif;
    background-color: var(--bg-color);
    color: var(--text-color);
    line-height: 1.6;
}

header {
    padding: 40px 20px;
    text-align: center;
}

h1 {
    font-size: 3rem;
    font-weight: 300;
    letter-spacing: -1px;
    margin: 0;
}

.gallery-grid {
    display: grid;
    grid-template-columns: repeat(auto-fill, minmax(300px, 1fr));
    gap: var(--grid-gap);
    padding: var(--grid-gap);
}

.gallery-item {
    aspect-ratio: 16 / 9;
    overflow: hidden;
    cursor: pointer;
    background-color: #f0f0f0;
}

.gallery-item img {
    width: 100%;
    height: 100%;
    object-fit: cover;
    transition: transform var(--transition-speed) ease;
}

.gallery-item:hover img {
    transform: scale(1.05);
}

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

.lightbox-content {
    max-width: 90%;
    max-height: 80%;
    display: flex;
    justify-content: center;
    align-items: center;
}

.lightbox-content img {
    max-width: 100%;
    max-height: 100%;
    object-fit: contain;
    animation: zoomIn 0.3s ease;
}

@keyframes zoomIn {
    from { transform: scale(0.9); opacity: 0; }
    to { transform: scale(1); opacity: 1; }
}

.close-btn {
    position: absolute;
    top: 20px;
    right: 30px;
    color: #fff;
    font-size: 40px;
    font-weight: bold;
    cursor: pointer;
    z-index: 1001;
}

.nav-btn {
    position: absolute;
    top: 50%;
    transform: translateY(-50%);
    background: none;
    border: none;
    color: #fff;
    font-size: 40px;
    cursor: pointer;
    padding: 20px;
    z-index: 1001;
    transition: color 0.2s;
}

.nav-btn:hover {
    color: #ccc;
}

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

@media (max-width: 768px) {
    h1 { font-size: 2rem; }
    .gallery-grid { grid-template-columns: repeat(auto-fill, minmax(150px, 1fr)); }
    .nav-btn { font-size: 30px; padding: 10px; }
}