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

Title: Portal Brew
Slogan: Stir the swirl, sip the mist
Visual style: whimsical surreal retro-futuristic line art with neon glow and pastel gradients
Mood: quirky and slightly unsettling
Core concept prompt: A giant coffee cup resting on a vintage cafe table rendered in surreal line art with swirling mist and neon yellow glowing portal shapes emerging from the cup, pastel gradient colors blending with black background, bold silhouette centered composition, large readable whimsical typography with the slogan 'Stir the swirl, sip the mist'.

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 names, celebrity likenesses, political slogans, 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: Portal Brew
Slogan: Stir the swirl, sip the mist
Visual style: whimsical surreal retro-futuristic line art with neon glow and pastel gradients
Mood: quirky and slightly unsettling
Core concept prompt: A giant coffee cup resting on a vintage cafe table rendered in surreal line art with swirling mist and neon yellow glowing portal shapes emerging from the cup, pastel gradient colors blending with black background, bold silhouette centered composition, large readable whimsical typography with the slogan 'Stir the swirl, sip the mist'.

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 names, celebrity likenesses, political slogans, 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.