/* 瀑布流容器 */
.masonry-container {
    padding: 0 40px 80px;
    column-count: 5;
    column-gap: 20px;
    max-width: 1800px;
    margin: 0 auto;
}

/* 瀑布流项目 */
.masonry-item {
    break-inside: avoid;
    margin-bottom: 20px;
    position: relative;
    border-radius: 16px;
    overflow: hidden;
    cursor: pointer;
    opacity: 0;
    transform: translateY(30px);
    will-change: opacity, transform;
}

.masonry-item.fade-in {
    opacity: 1;
    transform: translateY(0);
    transition: opacity 0.8s ease, transform 0.8s cubic-bezier(0.215, 0.61, 0.355, 1);
}

.masonry-item:hover {
    transform: translateY(-5px);
}

.masonry-image {
    width: 100%;
    height: auto;
    display: block;
    border-radius: 16px;
    transition: transform 0.3s ease;
}

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

/* 图片信息 */
.masonry-info {
    position: absolute;
    bottom: 0;
    left: 0;
    right: 0;
    padding: 20px;
    background: linear-gradient(to top, rgba(0,0,0,0.8), transparent);
    color: #fff;
    opacity: 0;
    transition: opacity 0.3s ease;
}

.masonry-item:hover .masonry-info {
    opacity: 1;
}

.masonry-title {
    font-size: 1rem;
    font-weight: 300;
    margin-bottom: 5px;
}

.masonry-description {
    font-size: 0.9rem;
    opacity: 0.8;
}

/* 图片模态框 */
.masonry-modal {
    position: fixed;
    top: 0;
    left: 0;
    right: 0;
    bottom: 0;
    background: rgba(0,0,0,0.9);
    display: none;
    justify-content: center;
    align-items: center;
    z-index: 2000;
    padding: 40px;
    backdrop-filter: blur(10px);
}

.masonry-modal.active {
    display: flex;
}

.modal-content {
    max-width: 90%;
    max-height: 90vh;
    position: relative;
}

.modal-image {
    max-width: 100%;
    max-height: 90vh;
    object-fit: contain;
    border-radius: 8px;
}

.modal-close {
    position: absolute;
    top: -40px;
    right: -40px;
    width: 40px;
    height: 40px;
    border: none;
    background: none;
    color: #fff;
    font-size: 24px;
    cursor: pointer;
    transition: transform 0.3s ease;
}

.modal-close:hover {
    transform: rotate(90deg);
}

/* 响应式设计 */
@media (max-width: 1400px) {
    .masonry-container {
        column-count: 4;
        padding: 0 30px 60px;
    }
}

@media (max-width: 1200px) {
    .masonry-container {
        column-count: 3;
        padding: 0 25px 50px;
    }
}

@media (max-width: 992px) {
    .masonry-container {
        column-count: 2;
        padding: 0 20px 40px;
    }
}

@media (max-width: 576px) {
    .masonry-container {
        column-count: 1;
        padding: 0 15px 30px;
    }
    
    .modal-close {
        top: 10px;
        right: 10px;
    }
    
    .upload-button {
        padding: 10px 20px;
    }
}

/* 减少动画 */
@media (prefers-reduced-motion: reduce) {
    .masonry-item {
        transition: opacity 0.3s ease;
    }
    
    .masonry-item:hover .masonry-image {
        transform: none;
    }
}

/* 加载动画 */
.masonry-loading {
    width: 100%;
    height: 200px;
    display: flex;
    justify-content: center;
    align-items: center;
}

.loading-spinner {
    width: 40px;
    height: 40px;
    border: 3px solid rgba(255,255,255,0.1);
    border-radius: 50%;
    border-top-color: #fff;
    animation: spin 1s linear infinite;
}

@keyframes spin {
    to { transform: rotate(360deg); }
}