/* =========================================
   Galleries 样式 - 相册网格 + 相册详情 + 灯箱
   ========================================= */

/* --- 分类过滤按钮 --- */
.gallery-filters {
    display: flex;
    gap: 10px;
    margin-bottom: 36px;
    flex-wrap: wrap;
}

.filter-btn {
    background: transparent;
    border: 1px solid var(--border);
    color: var(--text-secondary);
    padding: 6px 18px;
    border-radius: 4px;
    font-family: var(--font-mono);
    font-size: 0.8rem;
    letter-spacing: 1px;
    cursor: pointer;
    transition: all var(--transition);
}

.filter-btn:hover,
.filter-btn.active {
    background: var(--accent);
    border-color: var(--accent);
    color: #fff;
}

/* --- 相册网格 --- */
.album-grid {
    display: grid;
    grid-template-columns: repeat(3, 1fr);
    gap: 20px;
}

.album-card {
    position: relative;
    border-radius: 6px;
    overflow: hidden;
    cursor: pointer;
    background: var(--bg-card);
    border: 1px solid var(--border);
    transition: transform var(--transition), border-color var(--transition);
    display: block;
}

.album-card:hover {
    transform: translateY(-4px);
    border-color: var(--border-hover);
}

.album-card__cover {
    aspect-ratio: 4 / 5;
    overflow: hidden;
}

.album-card__cover img {
    width: 100%;
    height: 100%;
    object-fit: cover;
    transition: transform 0.5s ease;
}

.album-card:hover .album-card__cover img {
    transform: scale(1.04);
}

/* 封面上的渐变信息层 */
.album-card__info {
    position: absolute;
    bottom: 0;
    left: 0;
    right: 0;
    padding: 60px 16px 16px;
    background: linear-gradient(to top, rgba(0,0,0,0.85), transparent);
    display: flex;
    flex-direction: column;
    gap: 4px;
}

.album-card__title {
    font-size: 1rem;
    font-weight: 600;
    color: #fff;
}

.album-card__meta {
    font-size: 0.72rem;
    color: var(--text-muted);
    font-family: var(--font-mono);
    letter-spacing: 0.5px;
    display: flex;
    align-items: center;
    gap: 8px;
}

/* 分类徽章 */
.album-badge {
    display: inline-block;
    padding: 2px 8px;
    border-radius: 3px;
    font-size: 0.68rem;
    font-family: var(--font-mono);
    letter-spacing: 1px;
    border: 1px solid var(--border-hover);
    color: var(--text-secondary);
    background: rgba(0, 0, 0, 0.45);
}

.album-badge--white {
    border-color: rgba(255, 255, 255, 0.5);
    color: #fff;
}

.album-badge--black {
    border-color: rgba(139, 92, 246, 0.6);
    color: var(--accent);
}

/* 空状态 */
.album-empty {
    grid-column: 1 / -1;
    color: var(--text-muted);
    text-align: center;
    padding: 60px 0;
}

/* --- 相册详情页 --- */
.album-back {
    display: inline-block;
    font-family: var(--font-mono);
    font-size: 0.85rem;
    letter-spacing: 1px;
    color: var(--text-secondary);
    margin-bottom: 24px;
}

.album-back:hover {
    color: var(--accent);
}

.album-header {
    margin-bottom: 40px;
    padding-bottom: 24px;
    border-bottom: 1px solid var(--border);
}

.album-header h1 {
    font-family: var(--font-mono);
    font-size: clamp(1.6rem, 4vw, 2.2rem);
    font-weight: 700;
    letter-spacing: 2px;
    margin-bottom: 10px;
}

.album-header__meta {
    display: flex;
    align-items: center;
    gap: 12px;
    font-family: var(--font-mono);
    font-size: 0.78rem;
    color: var(--text-muted);
    letter-spacing: 0.5px;
    margin-bottom: 12px;
}

.album-header__desc {
    color: var(--text-secondary);
    font-size: 0.95rem;
    max-width: 640px;
}

/* --- 照片瀑布流 (CSS columns) --- */
.masonry {
    column-count: 3;
    column-gap: 16px;
}

.masonry-item {
    break-inside: avoid;
    margin-bottom: 16px;
    border-radius: 6px;
    overflow: hidden;
    position: relative;
    cursor: pointer;
    background: var(--bg-card);
    border: 1px solid var(--border);
    transition: transform var(--transition), border-color var(--transition);
}

.masonry-item:hover {
    transform: translateY(-3px);
    border-color: var(--border-hover);
}

.masonry-item img {
    width: 100%;
    display: block;
    transition: transform 0.5s ease;
}

.masonry-item:hover img {
    transform: scale(1.03);
}

/* --- 灯箱 (Lightbox) --- */
.lightbox {
    display: none;
    position: fixed;
    inset: 0;
    background: rgba(0, 0, 0, 0.95);
    z-index: 2000;
    align-items: center;
    justify-content: center;
}

.lightbox.open {
    display: flex;
}

.lightbox__content {
    max-width: 90vw;
    max-height: 90vh;
    display: flex;
    flex-direction: column;
    align-items: center;
}

.lightbox__content img {
    max-width: 90vw;
    max-height: 82vh;
    object-fit: contain;
    border-radius: 4px;
    animation: lightbox-fade 0.3s ease;
}

@keyframes lightbox-fade {
    from { opacity: 0; transform: scale(0.95); }
    to   { opacity: 1; transform: scale(1); }
}

.lightbox__caption {
    margin-top: 14px;
    text-align: center;
    font-size: 0.8rem;
    color: var(--text-muted);
    font-family: var(--font-mono);
    letter-spacing: 1px;
}

.lightbox__close,
.lightbox__prev,
.lightbox__next {
    position: fixed;
    background: none;
    border: none;
    color: rgba(255,255,255,0.7);
    cursor: pointer;
    font-size: 2rem;
    padding: 12px;
    transition: color 0.2s ease;
    z-index: 2001;
}

.lightbox__close:hover,
.lightbox__prev:hover,
.lightbox__next:hover {
    color: #fff;
}

.lightbox__close {
    top: 20px;
    right: 24px;
    font-size: 2.4rem;
}

.lightbox__prev {
    top: 50%;
    left: 20px;
    transform: translateY(-50%);
    font-size: 3rem;
}

.lightbox__next {
    top: 50%;
    right: 20px;
    transform: translateY(-50%);
    font-size: 3rem;
}

/* --- 移动端适配 --- */
@media (max-width: 1024px) {
    .album-grid {
        grid-template-columns: repeat(2, 1fr);
    }

    .masonry {
        column-count: 2;
    }
}

@media (max-width: 600px) {
    .album-grid {
        grid-template-columns: 1fr;
    }

    .masonry {
        column-count: 1;
    }

    .lightbox__prev { left: 8px; }
    .lightbox__next { right: 8px; }
}