/* Painel de Configurações */
            .settings-panel { background: var(--card-bg); flex: 1; padding: 25px; border-radius: var(--radius); box-shadow: 0 4px 12px rgba(0,0,0,0.08); border: 1px solid var(--border-color); }
            
            .control-group { margin-bottom: 15px; }
            .control-group label { display: block; margin-bottom: 6px; font-weight: 600; font-size: 0.85rem; color: var(--text-main); }
            .control-group input[type="text"], .control-group select { width: 100%; padding: 8px 12px; border: 1px solid var(--border-color); border-radius: 6px; font-size: 0.9rem; background: #fafafa; }
            .control-group input[type="text"]:focus, .control-group select:focus { outline: 2px solid var(--primary-color); background: #fff; }
            
            .file-input { width: 100%; padding: 8px; border: 1px solid var(--border-color); border-radius: 6px; font-size: 0.9rem; background: #fafafa; cursor: pointer; }

            .action-btn { width: 100%; background-color: var(--primary-color); color: white; border: none; border-radius: 8px; padding: 12px; font-size: 1rem; font-weight: 600; cursor: pointer; transition: background-color 0.2s; margin-top: 10px; }
            .action-btn:hover { background-color: var(--primary-hover); }
            .action-btn:disabled { background-color: #cccccc; cursor: not-allowed; }

            /* Área de Visualização do Canvas (Padrão 512x512 do WhatsApp) */
            .preview-panel { background: #fff; flex: 1; padding: 25px; border-radius: var(--radius); box-shadow: 0 4px 12px rgba(0,0,0,0.08); border: 1px solid var(--border-color); display: flex; flex-direction: column; align-items: center; justify-content: center; position: relative; }
            
            .canvas-container {
                width: 256px;
                height: 256px;
                border: 2px dashed var(--border-color);
                border-radius: 8px;
                display: flex;
                justify-content: center;
                align-items: center;
                position: relative;
                /* Fundo quadriculado simulando transparência */
                background-image: linear-gradient(45deg, #e9edef 25%, transparent 25%), 
                                linear-gradient(-45deg, #e9edef 25%, transparent 25%), 
                                linear-gradient(45deg, transparent 75%, #e9edef 75%), 
                                linear-gradient(-45deg, transparent 75%, #e9edef 75%);
                background-size: 20px 20px;
                background-position: 0 0, 0 10px, 10px -10px, -10px 0px;
                overflow: hidden;
            }

            #stickerCanvas {
                width: 100%;
                height: 100%;
                display: none;
            }

            /* Estilização da pré-visualização do texto em tempo real */
            .preview-text-overlay {
                position: absolute;
                width: 100%;
                height: 100%;
                display: none;
                flex-direction: column;
                justify-content: space-between;
                padding: 12px;
                pointer-events: none;
                text-align: center;
                font-family: 'Impact', sans-serif;
                font-size: 22px;
                color: #ffffff;
                text-shadow: 
                    -2px -2px 0 #000,  2px -2px 0 #000,
                    -2px  2px 0 #000,  2px  2px 0 #000,
                    0px -2px 0 #000,  0px  2px 0 #000,
                    -2px  0px 0 #000,  2px  0px 0 #000;
            }
            
            .instruction { position: absolute; color: var(--text-muted); text-align: center; padding: 10px; font-size: 0.8rem; pointer-events: none; }

            .specs-info { font-size: 0.75rem; color: var(--text-muted); margin-top: 15px; text-align: center; }

            @media (max-width: 768px) { .main-container { flex-direction: column; } }