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

body {
    font-family: -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, sans-serif;
    background: #f5f5f5;
    color: #333;
}

header {
    display: flex;
    justify-content: space-between;
    align-items: center;
    padding: 1rem 2rem;
    background: #fff;
    border-bottom: 1px solid #ddd;
}

header h1 {
    font-weight: 400;
    font-size: 1.5rem;
}

.back {
    color: #666;
    text-decoration: none;
    font-size: 0.9rem;
}

.back:hover {
    color: #333;
}

/* Album grid */
.albums {
    display: grid;
    grid-template-columns: repeat(auto-fill, minmax(250px, 1fr));
    gap: 1.5rem;
    padding: 2rem;
}

.album-card {
    background: #fff;
    border-radius: 8px;
    overflow: hidden;
    text-decoration: none;
    color: #333;
    border: 1px solid #ddd;
    transition: box-shadow 0.2s;
}

.album-card:hover {
    box-shadow: 0 4px 12px rgba(0, 0, 0, 0.1);
}

.album-card img {
    width: 100%;
    aspect-ratio: 1;
    object-fit: cover;
}

.album-info {
    padding: 0.75rem 1rem;
    display: flex;
    justify-content: space-between;
    align-items: center;
}

.album-name {
    font-weight: 500;
}

.album-count {
    color: #888;
    font-size: 0.85rem;
}

.empty {
    grid-column: 1 / -1;
    text-align: center;
    color: #888;
    padding: 4rem 0;
}

/* Photo grid */
.photo-grid {
    display: grid;
    grid-template-columns: repeat(auto-fill, minmax(200px, 1fr));
    gap: 4px;
    padding: 4px;
}

.photo-cell {
    cursor: pointer;
}

.photo-cell img {
    width: 100%;
    aspect-ratio: 1;
    object-fit: cover;
    display: block;
}

/* Lightbox */
.lightbox {
    position: fixed;
    inset: 0;
    background: rgba(0, 0, 0, 0.9);
    display: flex;
    align-items: center;
    justify-content: center;
    z-index: 1000;
}

.lightbox[hidden] {
    display: none;
}

#lb-img {
    max-width: 90vw;
    max-height: 90vh;
    object-fit: contain;
}

.lb-close, .lb-prev, .lb-next {
    position: absolute;
    background: none;
    border: none;
    color: #fff;
    font-size: 2rem;
    cursor: pointer;
    padding: 1rem;
    opacity: 0.7;
    transition: opacity 0.2s;
}

.lb-close:hover, .lb-prev:hover, .lb-next:hover {
    opacity: 1;
}

.lb-close {
    top: 0;
    right: 0;
}

.lb-prev {
    left: 0;
    top: 50%;
    transform: translateY(-50%);
    font-size: 3rem;
}

.lb-next {
    right: 0;
    top: 50%;
    transform: translateY(-50%);
    font-size: 3rem;
}