.upload-area {
            border: 2px dashed var(--primary-color);
            border-radius: 12px;
            padding: 2rem 1rem;
            text-align: center;
            background-color: rgba(70, 130, 180, 0.03);
            transition: background-color 0.2s;
            cursor: pointer;
            margin: 1rem 0;
        }
        .upload-area:hover {
            background-color: rgba(70, 130, 180, 0.08);
        }
        .upload-area i {
            font-size: 3rem;
            color: var(--primary-color);
            opacity: 0.7;
        }
        .preview-container {
            display: flex;
            flex-wrap: wrap;
            gap: 1.5rem;
            justify-content: center;
            margin: 1.5rem 0;
        }
        .preview-card {
            flex: 1 1 250px;
            border: 1px solid var(--border-color);
            border-radius: 10px;
            padding: 1rem;
            background: #fff;
            text-align: center;
            box-shadow: 0 2px 8px rgba(0,0,0,0.05);
        }
        .preview-card img {
            max-width: 100%;
            max-height: 200px;
            border-radius: 6px;
            border: 1px solid #eee;
        }
        .file-info {
            font-size: 0.9rem;
            color: var(--text-muted);
            margin: 0.5rem 0;
        }
        .download-btn {
            margin-top: 1rem;
        }
        .quality-slider {
            width: 100%;
            margin-top: 0.5rem;
        }
        .legend {
            justify-content: center;
            margin-top: 1rem;
            font-size: 0.9rem;
        }
        .geometry-canvas {
            display: none;
        }
        .canvas-container {
            border: none;
            background: transparent;
        }
        .result-container .row {
            align-items: center;
        }
        .example-btn i {
            margin-right: 4px;
        }
        .conversion-stats {
            font-size: 0.95rem;
            background-color: #e8f4fd;
            padding: 0.4rem 1rem;
            border-radius: 30px;
            display: inline-block;
        }
        .privacy-badge {
            background-color: #d4edda;
            color: #155724;
            padding: 0.5rem 1rem;
            border-radius: 30px;
            display: inline-block;
            margin-top: 0.5rem;
        }
        .batch-file-list {
            max-height: 300px;
            overflow-y: auto;
            border: 1px solid #ddd;
            border-radius: 8px;
            padding: 0.5rem;
            background: #f9f9f9;
        }
        .batch-file-item {
            display: flex;
            align-items: center;
            justify-content: space-between;
            padding: 0.5rem;
            border-bottom: 1px solid #eee;
        }
        .batch-file-item:last-child {
            border-bottom: none;
        }
        .batch-file-status {
            font-size: 0.85rem;
            width: 80px;
            text-align: right;
        }
        .status-badge {
            display: inline-block;
            padding: 0.2rem 0.5rem;
            border-radius: 20px;
            font-size: 0.75rem;
            font-weight: 600;
        }
        .status-pending { background: #e2e3e5; color: #383d41; }
        .status-converting { background: #fff3cd; color: #856404; }
        .status-done { background: #d4edda; color: #155724; }
        .status-failed { background: #f8d7da; color: #721c24; }