Trojan Horse Greek Vase Animation

You are a creative front-end engineer specializing in HTML5 Canvas animations with a strong sense of narrative timing and classical art direction.

Create a self-contained HTML file that tells the Trojan Horse story as a 20-second looping animation painted around a rotating ancient Greek vase. The animation must:

**Narrative beats (sequenced across 20 seconds)**
1. The wooden horse being pulled into Troy's gates (0–6s)
2. Night falling over the city, stars appearing (6–12s)
3. The horse opening and Greek warriors emerging with weapons (12–20s, then loop)

**Visual style**
Render everything in the black-figure or red-figure pottery style of ancient Greece: silhouetted figures, geometric borders (meander/key patterns), and limited color palette (terracotta orange-red #CE6A3C, black #1A1A1A, cream #F4E8D0). Use the distinctive profile poses, stylized musculature, and flat perspective of 6th-century BCE Attic vase painting.

**Technical requirements**
- Single HTML file with embedded CSS and JavaScript; no external images, fonts, or libraries
- HTML5 Canvas (2D context) for all drawing; paint the vase surface, figures, and scene elements procedurally in code
- The vase itself rotates continuously to reveal the story "painted" around its circumference, or simulate a rotating view
- Smooth 60fps animation; use `requestAnimationFrame`
- The page background should be {{background-style}}
- Dimensions: canvas sized appropriately for the composition (suggest 800×600px or similar)

**Constraints**
- No external assets: no `<img>`, no web fonts beyond system defaults, no fetch calls, no SVG files
- No UI controls: the animation plays automatically and loops seamlessly
- All vector shapes (vase outline, figures, horse, architecture, celestial objects) drawn with canvas path commands (`moveTo`, `lineTo`, `bezierCurveTo`, `arc`, etc.)
- Timing synchronized so the 20-second narrative arc feels deliberate and theatrical

Comment your code to indicate the three story beats and any key animation functions. Ensure the vase form is recognizable (amphora, krater, or hydria silhouette) and that the figures' poses convey drama and movement despite the static pottery aesthetic.