City Twelve Hours Time Light Shadow Collage Poster

Please create a high-completion, high-aesthetic, suitable-for-series-release vertical poster themed '【City Name】 Twelve Shichen (Twelve Hours)' for 【City Name】.

【Core Positioning】
This is not an ordinary travel collage, nor a single landscape poster, but a city-themed collage poster with a 'sense of time narrative, city recognition, series cover feel, and magazine feature feel'. The overall look should be like a standard main poster in a mature content column or cultural tourism visual series, with exquisite, unified, clear, and viral images.

【Format Requirements】
- Fixed vertical poster composition
- Aspect ratio recommended as 3:4
- Must have a 'large poster feel' and high-resolution texture
- Suitable for mobile browsing, as well as for content covers and series release images

【Layout Structure】
The entire poster must consist of 12 images, using a fixed 3-column × 4-row layout structure, totaling 12 visual units, forming a clear collage grid. Each small image should be relatively independent and visually appealing, but must maintain unity with the whole, not looking like a messy collage of screenshots.

【Theme Logic】
The poster theme is '【City Name】 Twelve Shichen'. The 12 images need to revolve around the same city, forming a complete timeline from sunrise to sunset, and then to the falling of night, reflecting the changes in the city's temperament during different periods of the day. The images must have a clear sense of time progression, rather than randomly placing 12 city landscapes.

【Content Requirements】
1. Must include the most representative key landmarks, cityscapes, or iconic scenes of 【City Name】.
2. Landmarks should be naturally distributed across the 12 images, without mechanical repetition, and do not just photograph the same building in every grid.
3. Scene content can include: city skyline, landmark buildings, blocks, cultural spaces, bridges, water areas, parks, historical buildings, night views, city life atmosphere, etc.
4. Different time periods should have different lighting and atmosphere changes, for example: dawn, early morning, morning, noon, afternoon, evening, sunset, blue hour, early night, city night view.
5. The overall should reflect the fluidity, rhythm, and layering of the same city within a single day.

【Visual Style】
- Overall mainly features a sense of realistic photography, cultural tourism feature feel, and city magazine feel
- Has unified color grading and a sense of series
- Images are exquisite, clean, and orderly
- Combines a premium feel, documentary temperament, and viral cover attributes
- Can have a slight cinematic feel, but do not over-retouch to the point of distortion
- Every small image must be beautiful, but more importantly, the overall unity

【Color and Lighting】
- The overall color should change naturally with the timeline, from morning light to day, from evening to night, forming a continuous color temperature change
- Changes such as sunrise warm gold, daytime clear, dusk orange gold, nightfall blue tone, and night view warm lights are allowed
- But the overall post-production tone still needs to be unified, and each grid cannot look like a different filter
- Emphasize the sky, water surface, building lights, city layers, and sense of air

【Title Design】
The main title of the poster is: '【City Name】 Twelve Shichen'
Requirements:
1. The title must be clearly readable, serving as the series' main visual.
2. There must be good visual balance between the title and the images, and a whole black mask cannot be simply and roughly pressed behind the text.
3. Text readability needs to be handled in a more premium way, for example: reasonable white space, local darkening, soft gradients, slight blurring, light and shadow avoidance, semi-transparent delicate backing, or letting the title fall in a position more suitable for reading.
4. The title must be prominent, but cannot destroy the overall aesthetic of the base image.
5. Can be paired with small-area subtitles, seals, time tags, or light decorative elements, but not too many.

【Layout and Visual Center of Gravity】
- The 12-grid collage is the main structure
- The title is the main visual anchor
- Need to reorganize the composition so that the text and collage content form a balance, rather than a rigid overlay
- The overall reading logic should be clear: see the title first, then browse the 12 time slices, and then feel the one-day changes of the whole city
- Must have a clear poster feel, rather than an ordinary puzzle screenshot

【Quality Requirements】
- Images must be clean, unified, premium, and design-oriented
- There must be both differences and consistency among the 12 images
- Clear landmarks, high city recognition
- Clear timeline, distinct theme
- Mature and natural title layout
- Avoid clutter, avoid out-of-control collage, avoid rigid text-over-image, avoid low-quality tourism promotional image feel

【Replaceable Fields】
【City Name】 = User-specified city
【Style Tendency】 = Cultural tourism feel / Magazine feel / Documentary feel / Urban premium feel / Historical and humanistic feel
【Main Color Temperament】 = Morning pale gold / Clear blue-green / Dusk orange gold / Nightfall deep blue / City neon, etc.
【Title Style】 = Chinese calligraphy feel / Modern title font / Literary magazine font / City feature font
【Sub-elements】 = Small seal / Small tag / Time sequence mark / Minimalist subtitle

If the user only inputs a city name, please automatically understand and complete:
- The most representative landmarks of the city
- The most suitable one-day timeline to express
- Typical scenes that best reflect the city's temperament
- The most reasonable lighting and color changes