.document-preview {
    border: 1px solid #e5e7eb;
    border-radius: 4px;
    padding: 1rem;
    margin: 1rem 0;
    background: #fff;
}

.preview-image {
    max-width: 100%;
    height: auto;
    margin-bottom: 1rem;
    border: 1px solid #f0f0f0;
    border-radius: 2px;
}

.doc-preview-error {
    color: #dc2626;
    padding: 1rem;
    border: 1px solid #fecaca;
    border-radius: 4px;
    background: #fef2f2;
}

/* 增强防下载保护 */
.preview-image {
    pointer-events: none;
}

.document-preview [oncontextmenu] {
    user-select: none !important;
    -webkit-user-select: none !important;
}