City Twelve Hours Poster

Please create a high-quality, aesthetically pleasing, and suitable vertical poster for the "[City Name] Twelve Hours" themed poster for [City Name].

[Core Positioning]
This is not an ordinary travel puzzle or a single scenic poster, but a city-themed collage poster with a sense of "time narrative, city recognition, series cover, and magazine feature feel." The overall image should resemble a standard main poster in a mature content column or a cultural tourism visual series, with exquisite, unified, clear, and distinctive visuals.

[Size Requirements]
- Fixed as a vertical poster composition
- The recommended ratio is 3:4
- It should have a "big poster feel" and a high-resolution texture
- Suitable for mobile browsing, as well as content covers and series release images

[Layout Structure]
The entire poster must consist of 12 images, arranged in fixed 3-column ×4-row layout, with a total of 12 image units, forming a clear collage grid. Each small frame should be relatively independent and visually appealing, while also maintaining unity with the overall picture, avoiding random stitching of screenshots.

[Thematic Logic]
The poster theme is "[City Name] Twelve Hours." The 12 maps need to revolve around the same city, forming a complete timeline from sunrise to sunset and then nightfall, reflecting the city's character changes at different times throughout the day. The visuals should have a clear sense of time progression, rather than randomly placing 12 cityscapes.

[Content Requirements]
1. Must include the most representative key landmarks, cityscapes, or iconic scenes of the [City Name].
2. Landmarks should be naturally distributed across 12 frames, without mechanical repetition or the same building in each frame.
3. Scene content may include: city skyline, landmark buildings, neighborhoods, cultural spaces, bridges, water bodies, parks, historic buildings, night views, urban living atmosphere, etc.
4. Different time periods should have different lighting and atmosphere changes, such as: dawn, early morning, morning, noon, afternoon, evening, sunset, blues moment, nightfall, city night view.
5. The whole should reflect the sense of movement, rhythm, and layering within the same city throughout the day.

[Visual Style]
- The overall focus is on authentic photography, cultural tourism themes, and city magazine style
- Unified color palette and a sense of series
- The image is exquisite, clean, and orderly
- Combines sophistication, documentary quality, and cover cover quality
- It can have a slight cinematic feel, but don't over-retouch it to the point of distortion
- Every small scene should be beautiful, but more importantly, the overall look should be unified

[Color and Light & Shadow]
- The overall color should naturally change along the timeline, from morning light to daytime, from evening to night, forming a continuous color temperature variation
- Allows for changes such as sunrise warm gold, clear daylight, dusk orange-gold, night blue, and night scene warm lights
- However, the overall post-production color tone still needs to be consistent; you cannot use different filters for each frame
- Emphasize sky, water, architectural lighting, urban layers, and a sense of air

[Title Design]
The main poster title is: "[City Name] Twelve Hours"
Requirements:
1. The title must be clear and legible, serving as the main visual for the series.
2. There should be a good visual balance between the title and the image; don't simply or crudely press a black mask behind the text.
3. Text readability needs to be handled in more advanced ways, such as: reasonable blank space, partial darkening, soft gradients, slight blurring, light and shadow avoidance, semi-transparent delicate backgrounds, or placing the title in a more readable position.
4. The title should stand out without ruining the overall aesthetic of the base map.
5. Small subtitles, stamps, time tags, or light decorative elements can be used, but not excessively.

[Layout and Visual Focal Point]
- The 12-panel collage is the main structure
- The title is the main visual anchor
- The composition needs to be reorganized to balance text and collage content, rather than overlaying it awkwardly
- The overall reading logic should be clear: first see the title, then browse through 12 time slices, and finally experience the daily changes of the entire city
- Have a clear poster feel, not just a regular puzzle screenshot

[Quality Requirements]
- The image must be neat, unified, high-end, and well-designed
- There are both differences and consistency among the 12 images
- Clear landmarks and high city recognition
- Clear timeline and distinct theme
- The title layout is mature and natural
- Avoid clutter, prevent collage from getting out of control, avoid stiff text compression, and avoid low-quality travel promotional images

[Replaceable Fields]
[City Name] = User-specified city
[Style Preferences] = Cultural and tourism feel / Magazine feel / Documentary feel / Urban sophistication / Historical and cultural sensibility
[Main Color and Temperament] = Morning light gold / Clear blue-green / Dusk orange-gold / Night deep blue / City neon, etc
[Title Style] = Chinese calligraphy style / Modern title font / Literary magazine font / City feature font
[Sub-element] = Small seal / Small label / Timing marker / Minimalist subtitle

If the user only enters the city name, please automatically understand and complete the information:
- The city's most iconic landmark
- The best daily timeline for performance
- The typical scene that best reflects the city's character
- The most reasonable changes in light and color variation