Create a square t-shirt graphic design with the following concept:

Title: Quantum Brew Portal
Slogan: Sip the Surreal
Visual style: black line art with glowing gradient fills, surreal and quirky
Mood: strange and quirky
Core concept prompt: A giant surreal coffee cup glowing with gradient fills, centered on a black background. The cup has swirling portal shapes shimmering with subtle glow effects, line art style with clean contours. Below, bold large-readable slogan text reads 'Sip the Surreal' in a quirky typography style. No background scenery, focusing solely on the floating glowing coffee cup and the slogan.

Hard constraints:
- Keep composition centered and shirt-print friendly.
- Use high-contrast, clear forms suitable for print.
- Any text must be large and easily readable.
- Exclude all forbidden elements: real brand logos, celebrity faces, political symbols, explicit content, tiny unreadable text
- Do not include real brand names/logos, celebrity likenesses, copyrighted characters, political campaign slogans, hateful content, or explicit content.

Output a clean standalone design graphic, no mockup, no watermark, no background scene.

Create a square t-shirt graphic design with the following concept:

Title: Quantum Brew Portal
Slogan: Sip the Surreal
Visual style: black line art with glowing gradient fills, surreal and quirky
Mood: strange and quirky
Core concept prompt: A giant surreal coffee cup glowing with gradient fills, centered on a black background. The cup has swirling portal shapes shimmering with subtle glow effects, line art style with clean contours. Below, bold large-readable slogan text reads 'Sip the Surreal' in a quirky typography style. No background scenery, focusing solely on the floating glowing coffee cup and the slogan.

Hard constraints:
- Keep composition centered and shirt-print friendly.
- Use high-contrast, clear forms suitable for print.
- Any text must be large and easily readable.
- Exclude all forbidden elements: real brand logos, celebrity faces, political symbols, explicit content, tiny unreadable text
- Do not include real brand names/logos, celebrity likenesses, copyrighted characters, political campaign slogans, hateful content, or explicit content.

Output a clean standalone design graphic, no mockup, no watermark, no background scene.