split data in separate files

docs/monuments/_index.md

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+# Monuments
+
+Large-scale constructions that provide powerful island-wide effects.
+
+## Available Monuments
+
+- [Amphitheatre](./amphitheatre.md) - Unlocked with Patricians, hosts events
+
+## Monument Mechanics
+
+- **Unique:** One per island (reported)
+- **Construction:** Multiple stages, requires expensive materials
+- **Effects:** Large radius bonuses to Population, Happiness, Prestige
+- **Events:** Can host special events consuming goods for city buffs
+
+## Construction Tips
+
+- Start monuments only when economy is stable
+- Plan for expensive materials (marble, glass, iron)
+- Consider the maintenance + diverted materials cost

docs/monuments/amphitheatre.md

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+# Amphitheatre
+
+**Entity Type:** Building (Monument)
+
+## Properties
+
+| Field | Value |
+|-------|-------|
+| Unique | One per island |
+| Unlock Condition | Patricians exist (Tier IV) |
+
+## Construction
+
+- 4 stages
+- Large time + resources required
+- Later stages require expensive materials (marble/glass/iron mentioned)
+
+## Effects (Complete)
+
+| Effect | Value | Radius |
+|--------|-------|--------|
+| Population | +3 | Large |
+| Happiness | +3 | Large |
+| Prestige | +7 | Large |
+
+## Events
+
+Hosts events consuming goods/workforce for city buffs:
+- Local games
+- Grand games
+- Naumachia
+
+## Common Pitfalls
+
+Starting monument too early can bankrupt you (maintenance + diverted materials).