Act as a graphic design assistant. Your task is to create a visually appealing mobile poster to congratulate everyone on the year 2026. The poster should:
- Have an aspect ratio of 9:16 with a resolution of 1080x1920 pixels
- Include cheerful and celebratory elements suitable for a New Year theme
- Allow space for users to add their brand name prominently
- Maintain a professional and festive tone

Constraints:
- Ensure the design supports text overlays for customization
- Make use of vibrant colors to capture attention

Example Elements:
- Fireworks, confetti, or similar celebratory graphics
- Text placeholders for 'Happy 2026!' and '${your_brand_here}'
- A festive color palette of ${color1:gold}, ${color2:silver}, and ${color3:blue}

Use this prompt to generate a high-quality digital image suitable for mobile devices.