/* ============================================================
   瀑布流相册（Justified Gallery / 500px 风格）
   aphoto 模式下自动启用
   ============================================================ */

/* 容器 */
.wf-container {
    position: relative;
    width: 100%;
    min-height: 300px;
}

/* 每个图片项 */
.wf-item {
    position: absolute;
    overflow: hidden;
    border-radius: 2px;
    opacity: 0;
    transform: translateY(20px);
    transition: opacity 0.5s ease, transform 0.5s ease;
    cursor: pointer;
}

.wf-item.wf-visible {
    opacity: 1;
    transform: translateY(0);
}

.wf-item-inner {
    position: relative;
    width: 100%;
    height: 100%;
    overflow: hidden;
}

.wf-img-wrap {
    width: 100%;
    height: 100%;
    overflow: hidden;
}

.wf-img-wrap img {
    width: 100%;
    height: 100%;
    object-fit: cover;
    transition: transform 0.8s cubic-bezier(0.25, 0.46, 0.45, 0.94);
}

.wf-item:hover .wf-img-wrap img {
    transform: scale(1.08);
}

/* 遮罩层 */
.wf-overlay {
    position: absolute;
    inset: 0;
    background: linear-gradient(to top, rgba(0,0,0,0.6) 0%, transparent 50%);
    opacity: 0;
    transition: opacity 0.3s ease;
    display: flex;
    flex-direction: column;
    justify-content: flex-end;
    padding: 16px;
}

.wf-item:hover .wf-overlay {
    opacity: 1;
}

.wf-overlay-content {
    color: #fff;
    transform: translateY(10px);
    transition: transform 0.3s ease;
}

.wf-item:hover .wf-overlay-content {
    transform: translateY(0);
}

.wf-overlay-title {
    font-size: 0.9rem;
    font-weight: 500;
    margin-bottom: 4px;
    font-family: var(--font-head);
}

.wf-overlay-meta {
    font-size: 0.7rem;
    opacity: 0.7;
    letter-spacing: 0.05em;
}

/* 相册徽章 */
.wf-album-badge {
    position: absolute;
    top: 12px;
    left: 12px;
    background: rgba(0,0,0,0.6);
    color: #fff;
    font-size: 0.65rem;
    letter-spacing: 0.1em;
    text-transform: uppercase;
    padding: 4px 10px;
    border-radius: 2px;
    backdrop-filter: blur(4px);
    z-index: 2;
}

/* 提示文字 */
.wf-mode-hint {
    text-align: center;
    font-size: 0.8rem;
    color: var(--muted);
    margin-top: 24px;
    letter-spacing: 0.05em;
}

/* aphoto 模式下的瀑布流（和 aphoto 风格统一） */
body.aphoto-mode .wf-item {
    border-radius: 0;
}

body.aphoto-mode .wf-overlay {
    background: linear-gradient(to top, rgba(0,0,0,0.7) 0%, rgba(0,0,0,0) 60%);
}

body.aphoto-mode .wf-overlay-title {
    font-weight: 400;
    letter-spacing: 0.02em;
}

/* 响应式 */
@media (max-width: 768px) {
    .wf-overlay {
        opacity: 1;
        background: linear-gradient(to top, rgba(0,0,0,0.6) 0%, transparent 60%);
    }
    .wf-overlay-content {
        transform: translateY(0);
    }
}