.feed-container {
    display: flex;
    flex-direction: column;
    gap: 2rem;
    margin-top: 1rem;
}

.feed-item {
    background: white;
    border-radius: 12px;
    overflow: hidden;
    box-shadow: 0 2px 10px rgba(0,0,0,0.05);
    transition: transform 0.2s, box-shadow 0.2s;
    position: relative;
}

.feed-item:hover {
    transform: translateY(-2px);
    box-shadow: 0 4px 15px rgba(0,0,0,0.1);
}

.feed-date {
    padding: 1rem 1.5rem;
    font-size: 0.9rem;
    color: #6c757d;
    border-bottom: 1px solid #f1f1f1;
}

.feed-description {
    padding: 1.5rem;
    color: #495057;
    line-height: 1.6;
}

.feed-preview {
    width: 100%;
    background: #f8f9fa;
    display: flex;
    justify-content: center;
    align-items: center;
    position: relative;
    min-height: 200px;
}

.feed-preview img {
    width: calc(100% - 3rem);
    height: 300px;
    object-fit: cover;
    display: block;
    cursor: pointer;
    margin: 0 1.5rem;
    border-radius: 8px;
}

.feed-preview .file-icon-container {
    padding: 3rem 2rem;
    text-align: center;
}

.feed-preview .file-icon {
    font-size: 4rem;
    color: #6c757d;
    margin-bottom: 1rem;
}

.feed-actions {
    padding: 1rem 1.5rem;
    border-top: 1px solid #f1f1f1;
    display: flex;
    justify-content: flex-end;
    gap: 1.5rem;
}

.feed-actions button, .feed-actions a {
    display: flex;
    align-items: center;
    gap: 0.5rem;
    font-size: 0.9rem;
    transition: color 0.2s;
}

.file-preview-container {
    display: none; /* 隐藏原有的网格预览 */
}

.photo-picker {
    display: inline-flex;
    align-items: center;
    min-height: 34px;
    padding: 0.4rem 0.85rem;
    border: 1px solid #d1d5db;
    border-radius: 8px;
    background: #F3ECE2;
    color: #4b5563;
    font-size: 0.875rem;
    font-weight: 500;
    line-height: 1;
    cursor: pointer;
    transition: background-color 0.2s, border-color 0.2s, color 0.2s;
}

.photo-picker:hover {
    background: #ebe1d4;
    border-color: #9ca3af;
    color: #374151;
}

.photo-picker:focus-within {
    outline: 2px solid rgba(107, 114, 128, 0.25);
    outline-offset: 2px;
}

.photo-picker input[type="file"] {
    position: absolute;
    width: 1px;
    height: 1px;
    padding: 0;
    margin: -1px;
    overflow: hidden;
    clip: rect(0, 0, 0, 0);
    white-space: nowrap;
    border: 0;
}

/* 删除按钮样式 */
.delete-btn {
    opacity: 0.8;
    transition: opacity 0.2s, transform 0.2s;
}

.feed-item:hover .delete-btn {
    opacity: 1;
}

.delete-btn:hover {
    transform: scale(1.1);
}

/* 图片悬停效果 */
.feed-preview img:hover {
    transform: scale(1.02);
    transition: transform 0.2s;
}

@media (max-width: 640px) {
    .delete-btn {
        opacity: 1;
    }
}

/* 桌面端图片预览优化 */
@media (min-width: 768px) {
    .feed-preview img {
        height: 500px; /* 显著增加桌面端预览图片高度 */
        width: calc(100% - 3rem);
        object-fit: cover;
    }

    .feed-preview {
        min-height: 500px;
    }
}

@media (min-width: 1024px) {
    .feed-preview img {
        height: 600px; /* 大屏幕进一步增加高度，接近正方形 */
    }

    .feed-preview {
        min-height: 600px;
    }
}

@media (min-width: 1200px) {
    .feed-preview img {
        height: 650px; /* 超大屏幕最大高度 */
    }

    .feed-preview {
        min-height: 650px;
    }
}