.preview-table-container {
            max-height: 400px;
            overflow-y: auto;
            border: 1px solid #dee2e6;
            border-radius: 8px;
            background: #fff;
            margin: 1.5rem 0;
            font-size: 0.9rem;
        }
        .preview-table {
            width: 100%;
            border-collapse: collapse;
            font-family: 'Segoe UI', 'Noto Sans', system-ui, sans-serif;
        }
        .preview-table th, .preview-table td {
            border: 1px solid #ddd;
            padding: 8px 10px;
            text-align: left;
            vertical-align: top;
        }
        .preview-table th {
            background-color: #f1f3f5;
            font-weight: 600;
            position: sticky;
            top: 0;
        }
        .upload-area {
            border: 2px dashed #adb5bd;
            border-radius: 16px;
            padding: 2rem;
            text-align: center;
            transition: all 0.2s;
            cursor: pointer;
            background-color: #fbfdff;
        }
        .upload-area:hover {
            border-color: #0d6efd;
            background-color: #f1f8ff;
        }
        .setting-group {
            background: #f8f9fc;
            padding: 1rem;
            border-radius: 12px;
            margin-bottom: 1rem;
        }
        .btn-pdf {
            background-color: #d9534f;
            border-color: #d43f3a;
            color: white;
        }
        .btn-pdf:hover {
            background-color: #c9302c;
        }
        .loader-overlay {
            position: fixed;
            top: 0;
            left: 0;
            width: 100%;
            height: 100%;
            background: rgba(0,0,0,0.5);
            z-index: 2000;
            display: flex;
            align-items: center;
            justify-content: center;
            color: white;
            font-size: 1.5rem;
            backdrop-filter: blur(4px);
        }