App Pop-Up UI Kit Showcase

Please generate a [aspect ratio] app pop-up design display image, with the theme [Theme],
The background is pure white, and the overall design proposal style is clean and simple.
The layout is 2×2 quad-grid layout, displaying four different pop-up schemes in one image,
All four pop-ups revolve around the same theme, but each has slightly different entry points, interest points, icon elements, and information structures.
Add a clear and prominent main title at the top [Main Title], and the subtitle can be "UI/UX DESIGN" or similar design display text.

[Theme] Can be replaced as: New User Benefits / Version Upgrades / 618 Major Sale / Member Activation / Check-in Rewards / Holiday Events / Invitation Gifts / Limited-Time Offers / Growth Tasks / Points Redemption
[Main Colors] can be replaced with: Green / Blue-Purple / Red-Orange-Gold / Black-Gold / Pink-Purple / Fresh Candy Colors
[Style Keywords] Can be replaced as: high clickability, light objectification, 3D cartoon, gummy texture, operation event pop-up, app welfare pop-up, gamified operation visuals, rounded cards, soft projection, gradient buttons

[Directions for the Four Subschemes] can be replaced as:
1. [Option 1]
2. [Option 2]
3. [Option 3]
4. [Option 4]

Each pop-up card should have a realistic structure like an app pop-up, including:
1. Top tags or scene markers (such as "Limited-Time Offer," "New Customer Exclusive," "Version Benefits," "Upgrade Experience," etc.)
2. Core title area, highlighting the event theme or key points
3. Main benefits section, expressed with big numbers, big discounts, and big selling points, such as coupon amounts, discounts, member prices, upgrade benefits, red packet amounts, task rewards, etc
4. Supplementary information, such as usage conditions, timed countdown, scope of application, growth steps, reward details, etc
5. Obvious CTA buttons such as "Claim Now," "Happy Accept," "Activate Now," "Update Now," "Try It," "Grab Now," etc
6. Keep the close button in the upper right corner to enhance the authentic UI pop-up feel

The four pop-ups need to unify the visual system, but each small card should have its own variations:
 The structure of the copy can vary
 Decorative patterns can vary
 Icons can vary
 The points of interest can vary
 Module layouts can vary slightly
But overall, it still belongs to four design schemes under the same theme.

Visually, please emphasize the following features:
 Display on a white background, clean pages, and avoid complicated backgrounds
 Vertical design display image, suitable for social media posting
 2×2 Clear layout, with ample blank space between the four cards
 Pop-up windows use rounded corner cards, soft projection, and slightly illuminated edges
 Large buttons should have a strong sense of clickability
 The overall color is vivid, but not messy
 Use a suitable amount of 3D small elements to boost vitality, such as gift boxes, coins, red envelopes, shopping bags, rockets, crowns, membership cards, treasure chests, bells, horns, medals, card coupons, and small mascots
 Elements should serve the pop-up theme, not overshadow the main topic

Layout requirements:
 The top headline is eye-catching, suitable for a "series cover"
 Four pop-ups are centered, forming a neat design display board
 The information is clearly hierarchical: first look at the title, then at the four pop-up windows
 Each pop-up should be referenced like a real, practical app operation interface, not just a regular poster
 Chinese text should be as concise and clear as possible, reduce overly small fragments, and avoid confusion caused by too much information
 Maintain the texture of "AI visual proposal images," suitable for UI/UX inspiration references, operational event displays, and product proposal sharing