.q3d-container {
            max-width: 90vw;
            margin: 0 auto;
            padding: 20px;
            font-size: 1rem;
        }
        .form-group {
            margin-bottom: 10px;
        }
        .form-group label {
            display: block;
            margin-bottom: 3px;
            font-weight: bold;
        }

        .drop-zone {
            border: 2px dashed #888;
            border-radius: 8px;
            padding: 30px;
            text-align: center;
            transition: border-color 0.3s, background-color 0.3s;
            margin-top: 10px;
            min-height: 120px;
        }

        .drop-zone.dragover {
            border-color: #0073aa;
            background-color: #f0f8ff;
        }

        /* Empty state - clickable */
        .drop-zone-empty {
            cursor: pointer;
        }
        .drop-zone-empty p {
            margin: 0;
            color: #666;
        }

        /* Preview state - shows thumbnail and filename */
        .drop-zone-preview {
            display: flex;
            align-items: center;
            gap: 20px;
            text-align: left;
        }

        .preview-thumbnail {
            flex-shrink: 0;
            display: flex;
            flex-direction: column;
            align-items: center;
            gap: 4px;
        }

        .thumbnail-image {
            width: 100px;
            height: 100px;
            background: #f8f9fa;
            border-radius: 8px;
            border: 1px solid #e0e0e0;
            display: flex;
            align-items: center;
            justify-content: center;
            overflow: hidden;
            cursor: pointer;
            transition: transform 0.2s, box-shadow 0.2s;
        }
        .thumbnail-image:hover {
            transform: scale(1.03);
            box-shadow: 0 4px 12px rgba(0, 0, 0, 0.15);
        }

        .thumbnail-image .thumbnail-img {
            width: 100%;
            height: 100%;
            object-fit: contain;
        }

        .thumbnail-placeholder {
            display: flex;
            flex-direction: column;
            align-items: center;
            gap: 4px;
            color: #6c757d;
        }
        .thumbnail-placeholder span {
            font-size: 11px;
            font-weight: 600;
        }

        .thumbnail-loading {
            display: flex;
            align-items: center;
            justify-content: center;
            width: 100%;
            height: 100%;
        }

        .spinner-small {
            width: 24px;
            height: 24px;
            border: 2px solid #e0e0e0;
            border-top-color: #0073aa;
            border-radius: 50%;
            animation: spin 0.8s linear infinite;
        }

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

        .preview-hint {
            font-size: 11px;
            color: #0073aa;
            font-weight: 500;
        }

        .preview-info {
            flex: 1;
            min-width: 0;
        }

        .preview-filename {
            display: block;
            font-weight: 600;
            color: #333;
            font-size: 14px;
            word-break: break-all;
            margin-bottom: 8px;
        }

        .change-file-btn {
            background: #f0f0f0;
            border: 1px solid #ccc;
            border-radius: 4px;
            padding: 6px 14px;
            font-size: 12px;
            color: #333;
            cursor: pointer;
            transition: background 0.2s;
        }
        .change-file-btn:hover {
            background: #e0e0e0;
        }

        .notice {
            background-color: #fff3cd;          /* soft warning yellow */
            border: 2px solid #ffc107;           /* strong highlight border */
            color: #856404;                      /* readable dark text */
            padding: 16px 20px;
            margin: 20px 0;
            border-radius: 12px;                 /* rounded edges */
            box-shadow: 0 4px 10px rgba(0, 0, 0, 0.08);
            text-align: center;
        }
        .notice-acknowledge-btn {
            background-color: #0073aa; /* WordPress blue */
            color: #fff;
            border: none;
            border-radius: 4px;
            margin-top: 12px;
            padding: 8px 20px;
            font-size: 14px;
            cursor: pointer;
        }
        .parts-container.disabled {
            pointer-events: none;
            opacity: 0.4;
            filter: blur(1px);
        }
        .notice p {
            margin: 0;
            font-size: 1rem;
            font-weight: 600;
            line-height: 1.4;
        }

        .form-group input,
        .form-group select,
        .form-group textarea {
            width: 100%;
            padding: 10px;
            border: 1px solid #ddd;
            border-radius: 4px;
        }
        .form-group select:disabled {
            background-color: #f5f5f5;
            color: #777;
            cursor: not-allowed;
        }
        .btn-submit, #add-part, .remove-part {
            background: #0073aa;
            color: white;
            padding: 12px 30px;
            border: none;
            border-radius: 4px;
            cursor: pointer;
            font-size: 1.05rem;
            margin-bottom: 12px;
        }
        .btn-submit:hover, #add-part:hover, .remove-part:hover {
            background: #005177;
        }
        .remove-part {
            background: #a00;
            margin-bottom: 10px;
        }
        hr {
            margin: 25px 0;
        }
        #form-message {
            margin-top: 15px;
            padding: 10px;
            border-radius: 4px;
        }
        #form-message.success {
            background: #d4edda;
            color: #155724;
        }
        #form-message.error {
            background: #f8d7da;
            color: #721c24;
        }
        #form-message.error ul {
            margin: 10px 0 0 20px;
            padding: 0;
        }
        #form-message.error li {
            margin-bottom: 5px;
        }

        /* Field error highlighting */
        .q3d-field-error {
            border-color: #dc3545 !important;
            box-shadow: 0 0 0 2px rgba(220, 53, 69, 0.25) !important;
        }
        input.q3d-field-error,
        select.q3d-field-error,
        textarea.q3d-field-error {
            border-color: #dc3545 !important;
            box-shadow: 0 0 0 2px rgba(220, 53, 69, 0.25) !important;
        }
        .drop-zone.q3d-field-error {
            border-color: #dc3545 !important;
            background-color: #fff5f5 !important;
        }
        .part-units.q3d-field-error {
            background-color: #fff5f5;
            border: 1px solid #dc3545;
            border-radius: 4px;
            padding: 10px;
        }
        small {
            color: #666;
            font-size: 0.9em;
        }
        .review-modal {
            position: fixed;
            top: 0;
            left: 0;
            width: 100%;
            height: 100%;
            background: rgba(0,0,0,0.6);
            display: flex;
            align-items: center;
            justify-content: center;
            z-index: 9999;
        }
        .review-modal .modal-content {
            background: #fff;
            padding: 2rem;
            border-radius: 10px;
            width: 90%;
            max-width: 600px;
            max-height: 80vh;
            overflow-y: auto;
            box-shadow: 0 0 20px rgba(0,0,0,0.2);
        }
        .modal-actions {
            text-align: right;
            margin-top: 1.5rem;
        }
        .modal-actions .btn {         
        }