.control-group { margin-bottom: 15px; }
        .control-group label { display: block; margin-bottom: 6px; font-weight: 600; font-size: 0.85rem; color: var(--text-main); }
        
        .file-input { width: 100%; padding: 10px; border: 1px dashed var(--border-color); border-radius: 8px; font-size: 0.9rem; background: #fafafa; cursor: pointer; }
        .file-input:hover { background: #f0f4f8; }

        .sliders-grid { display: grid; grid-template-columns: 1fr 1fr; gap: 12px; margin-bottom: 15px; }
        .slider-box { background: #f0f4f8; padding: 10px; border-radius: 8px; border: 1px solid var(--border-color); }
        .slider-box label { font-size: 0.75rem; display: flex; justify-content: space-between; margin-bottom: 4px; font-weight: 600; color: var(--text-main); }
        .slider-box input[type="range"] { width: 100%; accent-color: var(--primary-color); cursor: pointer; }

        .buttons-grid { display: grid; grid-template-columns: repeat(3, 1fr); gap: 8px; margin-bottom: 15px; }
        .filter-btn { background: #e2e8f0; border: none; padding: 8px; border-radius: 6px; font-size: 0.75rem; font-weight: 600; cursor: pointer; color: var(--text-main); transition: background 0.2s; text-align: center; }
        .filter-btn:hover, .filter-btn.active { background: var(--primary-color); color: white; }

        .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: 5px; }
        .action-btn:hover { background-color: var(--primary-hover); }

        .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; }
        
        .canvas-container { width: 100%; max-height: 320px; display: flex; justify-content: center; align-items: center; overflow: hidden; background: #f8fafc; border: 1px solid var(--border-color); border-radius: 8px; padding: 10px; margin-bottom: 15px; }
        canvas { max-width: 100%; max-height: 300px; object-fit: contain; border-radius: 4px; }

        @media (max-width: 768px) { 
            .main-container { flex-direction: column; } 
            .sliders-grid { grid-template-columns: 1fr; }
            .buttons-grid { grid-template-columns: 1fr; }
        }