diff --git a/src/screens/Actor.jsx b/src/screens/Actor.jsx
new file mode 100644
index 0000000..137eb59
--- /dev/null
+++ b/src/screens/Actor.jsx
@@ -0,0 +1,219 @@
+// Actor.jsx — OTIVM-IV
+// ACTOR context screen. Thin — delegates all rendering to Section.jsx.
+// Two modes:
+// 1. background_id = null → background selection UI
+// 2. background_id set → parameter instrument view
+//
+// Props:
+// state — current game state from server
+// onSelectBackground — fn(id) called when player confirms a background
+// col — passed through to Section for layout grid placement
+
+import { useState } from 'react'
+import Section from '../components/Section.jsx'
+import { BACKGROUNDS } from '../constants.js'
+
+export default function Actor({ state, onSelectBackground }) {
+ // Background selection mode
+ if (!state?.background_id || state.background_id === 'unknown') {
+ return
+ }
+
+ // Instrument view — build section data from state
+ const bg = BACKGROUNDS.find(b => b.id === state.background_id)
+ const den = state.den ?? 0
+ const aut = state.aut ?? 0
+ const autBand = autToBand(aut)
+
+ // LEFT column — identity + liquiditas
+ const identityItems = [
+ { key: 'Background', value: bg?.name || state.background_id, cls: '' },
+ { key: 'Latin', value: bg?.latin || '—', cls: '' },
+ { key: 'Chapter', value: `${toRoman(state.chapter || 1)} · ${chapterCity(state.chapter)}`, cls: '' },
+ { key: 'Dispatches', value: `${state.dispatches || 0} complete`, cls: state.dispatches > 0 ? 'good' : '' },
+ ]
+
+ const nextOtiumCost = 8 // OTIUM_CYCLE_TOTAL_DN — from cost-calibration-model.md
+ const liquiditasItems = [
+ { key: 'Available', value: `${den} dn`, cls: den > 50 ? 'good' : 'warn' },
+ { key: 'Committed', value: state.active_dispatch ? `${routeCost(state.active_dispatch.route_id)} dn` : '0 dn', cls: '' },
+ { key: 'Next otium cost', value: `−${nextOtiumCost} dn`, cls: 'bad' },
+ ]
+
+ // CENTER column — auctoritas + parameters
+ const auctoritas = {
+ faces: [
+ { label: 'Value True', value: autBand, discrepant: false },
+ { label: 'Perceived', value: autBand, discrepant: false },
+ { label: 'Social', value: autBand, discrepant: false },
+ ],
+ gap_note: '',
+ }
+
+ const parameters = buildParameterItems(state)
+
+ // RIGHT column — obligations + drift log
+ const obligationItems = [
+ { label: 'OTIVM access', amount: '2.00 dn', period: 'per otium cycle', source: 'cost-calibration-model.md', conf: 'LOW', debit: true },
+ { label: 'Personal maintenance', amount: '4.00 dn', period: 'per otium cycle', source: 'cost-calibration-model.md', conf: 'MEDIUM', debit: true },
+ { label: 'Officia obligations', amount: '2.00 dn', period: 'per otium cycle', source: 'cost-calibration-model.md', conf: 'LOW', debit: true },
+ ]
+
+ const driftItems = buildDriftItems(state)
+
+ return (
+ <>
+ {/* LEFT */}
+
+
+
+ {/* CENTER */}
+
+
+
+ {/* RIGHT */}
+
+
+ >
+ )
+}
+
+// ── Background selection UI ───────────────────────────────────────────────
+
+function BackgroundSelection({ onSelectBackground }) {
+ const [selected, setSelected] = useState(null)
+
+ return (
+
+
+
Before the first dispatch
+
+ Who were you?
+
+
+ Your background shapes your starting parameters. This choice is permanent.
+
+
+
+
+ {BACKGROUNDS.map(bg => (
+
+ ))}
+
+
+
+
+
+
+ )
+}
+
+// ── Helpers ───────────────────────────────────────────────────────────────
+
+function autToBand(aut) {
+ if (aut >= 30) return 'Distinguished'
+ if (aut >= 15) return 'High'
+ if (aut >= 5) return 'Medium'
+ return 'Low'
+}
+
+function toRoman(n) {
+ return ['I','II','III','IV','V'][Math.max(0, Math.min(4, (n || 1) - 1))]
+}
+
+function chapterCity(chapter) {
+ return ['Ostia','Capua','Brundisium','Carthago','Alexandria'][(chapter || 1) - 1] || 'Ostia'
+}
+
+// Approximate route cost for committed display
+function routeCost(routeId) {
+ const costs = { olive: 8, wine: 14, grain: 24, linen: 38 }
+ return costs[routeId] || 0
+}
+
+// Build parameter list from game state.
+// In OTIVM-III+ state the server returns a schema_version and parameters are
+// seeded from background_starting_values. Until full parameter API is exposed
+// we derive display values from the background seed and current den/aut.
+function buildParameterItems(state) {
+ const bg = BACKGROUNDS.find(b => b.id === state.background_id)
+ if (!bg) return []
+
+ // Background-derived parameter display — from BACKGROUNDS constant summaries.
+ // When the server exposes actor_parameters directly these will be replaced
+ // by real value_perceived and confidence_tag from the database.
+ const autBand = autToBand(state.aut || 0)
+
+ return [
+ { token: 'auctoritas', name: 'Auctoritas', true_val: autBand, perceived: autBand, conf: 'indicated' },
+ { token: 'liquiditas', name: 'Capital', true_val: `${state.den} dn`, perceived: `${state.den} dn`, conf: 'measured' },
+ { token: 'disciplina', name: 'Discipline', true_val: bgParam(bg.id, 'disciplina'), perceived: bgParam(bg.id, 'disciplina'), conf: 'indicated' },
+ { token: 'itineris_scientia', name: 'Route Knowledge', true_val: bgParam(bg.id, 'itineris'), perceived: bgParam(bg.id, 'itineris'), conf: 'indicated' },
+ { token: 'mercatus_scientia', name: 'Market Knowledge', true_val: bgParam(bg.id, 'mercatus'), perceived: bgParam(bg.id, 'mercatus'), conf: 'indicated' },
+ { token: 'negotiatio', name: 'Negotiation', true_val: bgParam(bg.id, 'negotiatio'), perceived: bgParam(bg.id, 'negotiatio'), conf: 'indicated' },
+ { token: 'clientela', name: 'Network', true_val: bgParam(bg.id, 'clientela'), perceived: bgParam(bg.id, 'clientela'), conf: 'indicated' },
+ { token: 'periculum_tolerantia', name: 'Risk Tolerance', true_val: bgParam(bg.id, 'periculum'), perceived: bgParam(bg.id, 'periculum'), conf: 'indicated' },
+ { token: 'ius_accessus', name: 'Legal Standing', true_val: bgParam(bg.id, 'ius'), perceived: bgParam(bg.id, 'ius'), conf: 'indicated' },
+ { token: 'officia_burden', name: 'Social Obligations', true_val: bgParam(bg.id, 'officia'), perceived: bgParam(bg.id, 'officia'), conf: 'estimated' },
+ ]
+}
+
+// Background starting parameter values — derived from background_starting_values seed data.
+// Keyed by background_id and a short token alias.
+// When the server exposes actor_parameters directly, this lookup is replaced.
+const BG_PARAMS = {
+ former_legionary: { disciplina: 'High', itineris: 'High', mercatus: 'Low', negotiatio: 'Low', clientela: 'Low', periculum: 'High', ius: 'Medium', officia: 'Low' },
+ freedman_trader: { disciplina: 'Medium', itineris: 'Medium', mercatus: 'High', negotiatio: 'High', clientela: 'Medium', periculum: 'Medium', ius: 'Low', officia: 'Low' },
+ noble_younger_son: { disciplina: 'Low', itineris: 'Low', mercatus: 'Low', negotiatio: 'Medium', clientela: 'High', periculum: 'Low', ius: 'High', officia: 'High' },
+ failed_magistrate: { disciplina: 'Medium', itineris: 'Low', mercatus: 'Low', negotiatio: 'Medium', clientela: 'Medium', periculum: 'Low', ius: 'High', officia: 'High' },
+ camp_logistician: { disciplina: 'High', itineris: 'High', mercatus: 'High', negotiatio: 'Medium', clientela: 'Low', periculum: 'Medium', ius: 'Medium', officia: 'Low' },
+ guild_scribe: { disciplina: 'Medium', itineris: 'Low', mercatus: 'Medium', negotiatio: 'Low', clientela: 'Low', periculum: 'Low', ius: 'Medium', officia: 'Low' },
+}
+
+function bgParam(bgId, alias) {
+ return BG_PARAMS[bgId]?.[alias] || 'Low'
+}
+
+// Build drift log display items from state.events
+function buildDriftItems(state) {
+ const events = state.events || []
+ const recent = events
+ .filter(e => ['dispatch_complete', 'otium', 'venture_complete'].includes(e.type))
+ .slice(-4)
+ .reverse()
+
+ return recent.map(e => {
+ if (e.type === 'dispatch_complete') {
+ return { param: 'Liquiditas', delta: `+${routeNet(e.route_id)} dn`, trigger: 'venture_complete', note: e.route_id, positive: true }
+ }
+ if (e.type === 'otium') {
+ return { param: 'Auctoritas', delta: '+1', trigger: 'interval_complete', note: 'otium rest', positive: true }
+ }
+ return { param: 'Event', delta: '—', trigger: e.type, note: null, positive: true }
+ })
+}
+
+function routeNet(routeId) {
+ const nets = { olive: 4, wine: 8, grain: 16, linen: 32 }
+ return nets[routeId] || '?'
+}
diff --git a/src/screens/Forum.jsx b/src/screens/Forum.jsx
new file mode 100644
index 0000000..39fff1b
--- /dev/null
+++ b/src/screens/Forum.jsx
@@ -0,0 +1,245 @@
+// Forum.jsx — OTIVM-IV
+// FORUM context screen. Replaces Ledger.jsx.
+// Thin wrapper — all game logic migrated from Ledger.jsx.
+// Rendering delegated to Section.jsx components.
+//
+// Props:
+// state — current game state
+// onStateChange — fn(newState) saves state to server
+// onNewGame — fn() called when new game is requested
+
+import { useState, useEffect, useRef } from 'react'
+import Section from '../components/Section.jsx'
+import { ROUTES, WAYPOINTS, OTIUM_DURATION_MS } from '../constants.js'
+import {
+ applyDispatch,
+ applyDispatchCost,
+ applyOtium,
+ getNewJournalEntry,
+ getSeenJournalEntries,
+ isRouteUnlocked,
+ getChapter,
+} from '../gameState.js'
+
+// Periodic expenditure constants — from docs/economy/cost-calibration-model.md
+const OTIUM_ACCESS_FEE_DN = 2.00
+const PERSONAL_MAINTENANCE_DN = 4.00
+const OFFICIA_OBLIGATION_DN = 2.00
+const OTIUM_CYCLE_TOTAL_DN = 8.00
+
+export default function Forum({ state, onStateChange, onNewGame }) {
+ const [selectedRoute, setSelectedRoute] = useState(null)
+ const [dispatch, setDispatch] = useState(null)
+ const [otium, setOtium] = useState(null)
+ const [message, setMessage] = useState('')
+ const [journal, setJournal] = useState(getSeenJournalEntries(state))
+ const [newEntryKey, setNewEntryKey] = useState(null)
+ const tickRef = useRef(null)
+ const msgRef = useRef(null)
+
+ function showMessage(text, dur = 3500) {
+ setMessage(text)
+ clearTimeout(msgRef.current)
+ msgRef.current = setTimeout(() => setMessage(''), dur)
+ }
+
+ // Tick — dispatch and otium completion
+ useEffect(() => {
+ tickRef.current = setInterval(() => {
+ const now = Date.now()
+
+ if (dispatch) {
+ const elapsed = now - dispatch.startMs
+ if (elapsed >= dispatch.durationMs) {
+ setDispatch(null)
+ const entry = getNewJournalEntry(state, dispatch.routeId)
+ const newState = applyDispatch(state, dispatch.routeId)
+ const route = ROUTES.find(r => r.id === dispatch.routeId)
+ showMessage(`Galley returned. +${route.profit} denarii.`)
+ if (entry) {
+ setJournal(j => [entry, ...j])
+ setNewEntryKey(`${dispatch.routeId}-${newState.route_dispatches[dispatch.routeId]}`)
+ setTimeout(() => setNewEntryKey(null), 5000)
+ }
+ setSelectedRoute(null)
+ onStateChange(newState)
+ }
+ }
+
+ if (otium) {
+ const elapsed = now - otium.startMs
+ if (elapsed >= OTIUM_DURATION_MS) {
+ setOtium(null)
+ const newState = applyOtium(state)
+ showMessage('Otium complete. Auctoritas recorded.')
+ onStateChange(newState)
+ }
+ }
+ }, 250)
+
+ return () => clearInterval(tickRef.current)
+ }, [dispatch, otium, state, onStateChange])
+
+ const busy = !!dispatch || !!otium
+
+ function handleSelectRoute(routeId) {
+ if (busy) return
+ if (!isRouteUnlocked(state, routeId)) return
+ setSelectedRoute(prev => prev === routeId ? null : routeId)
+ }
+
+ function handleDispatch() {
+ if (!selectedRoute) { showMessage('Select a trade route first.'); return }
+ if (dispatch) { showMessage('A galley is already at sea.'); return }
+ if (otium) { showMessage('Finish your otium first.'); return }
+ const route = ROUTES.find(r => r.id === selectedRoute)
+ if (state.den < route.cost) { showMessage('Not enough denarii for this voyage.'); return }
+ const newState = applyDispatchCost(state, selectedRoute)
+ onStateChange(newState)
+ setDispatch({ routeId: selectedRoute, startMs: Date.now(), durationMs: route.duration_ms })
+ showMessage(`Galley dispatched on ${WAYPOINTS[route.from].name} → ${WAYPOINTS[route.to].name}.`)
+ }
+
+ function handleOtium() {
+ if (dispatch) { showMessage('Your galley is at sea. Wait for it to return.'); return }
+ if (otium) return
+ setOtium({ startMs: Date.now() })
+ showMessage('You rest. The harbour sounds fade.')
+ }
+
+ function handleNewGame() {
+ if (!window.confirm('Abandon this ledger and begin a new one?')) return
+ onNewGame()
+ }
+
+ // Progress values for active dispatch or otium
+ let progressPct = 0
+ let progressLabel = ''
+ let progressSub = ''
+
+ if (dispatch) {
+ const elapsed = Date.now() - dispatch.startMs
+ progressPct = Math.min((elapsed / dispatch.durationMs) * 100, 100)
+ const route = ROUTES.find(r => r.id === dispatch.routeId)
+ progressLabel = `${WAYPOINTS[route.from].name} → ${WAYPOINTS[route.to].name}`
+ progressSub = `${Math.round(progressPct)}%`
+ } else if (otium) {
+ const elapsed = Date.now() - otium.startMs
+ progressPct = Math.min((elapsed / OTIUM_DURATION_MS) * 100, 100)
+ progressLabel = 'resting...'
+ progressSub = `${Math.round(progressPct)}%`
+ }
+
+ // ── Section data ─────────────────────────────────────────────────────────
+
+ // Active venture panel
+ const activeVentureItems = dispatch
+ ? (() => {
+ const route = ROUTES.find(r => r.id === dispatch.routeId)
+ return [
+ { key: 'Route', value: `${WAYPOINTS[route.from].name} → ${WAYPOINTS[route.to].name}`, cls: '' },
+ { key: 'Cargo', value: route.goods, cls: '' },
+ { key: 'Progress', value: `${Math.round(progressPct)}%`, cls: 'good' },
+ { key: 'Net', value: `+${route.profit - route.cost} dn expected`, cls: '' },
+ ]
+ })()
+ : otium
+ ? [
+ { key: 'Status', value: 'Otium in progress', cls: 'warn' },
+ { key: 'Progress', value: `${Math.round(progressPct)}%`, cls: '' },
+ { key: 'Cost', value: `−${OTIUM_CYCLE_TOTAL_DN} dn`, cls: 'bad' },
+ ]
+ : [{ key: 'Status', value: 'No galley at sea', cls: '' }]
+
+ // Route list for Section
+ const routeItems = ROUTES.map(route => {
+ const unlocked = isRouteUnlocked(state, route)
+ const vectura = Math.round(route.cost * 0.60 * 10) / 10
+ const portoria = Math.round(route.cost * 0.25 * 10) / 10
+ const other = Math.round((route.cost - vectura - portoria) * 10) / 10
+ return {
+ id: route.id,
+ name: `${WAYPOINTS[route.from].name} → ${WAYPOINTS[route.to].name}`,
+ goods: route.goods,
+ mode: route.id === 'grain' || route.id === 'linen' ? 'sea' : 'road',
+ days: Math.round(route.duration_ms / 3000),
+ cost: route.cost,
+ profit: route.profit,
+ vectura,
+ portoria,
+ other,
+ locked: !unlocked,
+ lock_reason: !unlocked
+ ? (state.den < route.unlock_den
+ ? `${route.unlock_den.toLocaleString()} dn`
+ : `Auctoritas ${route.unlock_aut}`)
+ : null,
+ }
+ })
+
+ // Standing block
+ const chapter = getChapter(state.den, state.aut)
+ const standingItems = [
+ { key: 'Denarii', value: `${Math.floor(state.den)} dn`, cls: state.den > 100 ? 'good' : 'warn' },
+ { key: 'Auctoritas', value: `${Math.floor(state.aut)}`, cls: '' },
+ { key: 'Chapter', value: `${['I','II','III','IV','V'][chapter - 1]} · ${['Ostia','Capua','Brundisium','Carthago','Alexandria'][chapter - 1]}`, cls: '' },
+ { key: 'Dispatches', value: `${state.dispatches || 0} complete`, cls: '' },
+ ]
+
+ // Expenditures (right column)
+ const expenditureItems = [
+ { label: 'OTIVM access', amount: `${OTIUM_ACCESS_FEE_DN} dn`, period: 'per otium cycle', source: 'cost-calibration-model.md', conf: 'LOW', debit: true },
+ { label: 'Personal maintenance', amount: `${PERSONAL_MAINTENANCE_DN} dn`, period: 'per otium cycle', source: 'cost-calibration-model.md', conf: 'MEDIUM', debit: true },
+ { label: 'Officia obligations', amount: `${OFFICIA_OBLIGATION_DN} dn`, period: 'per otium cycle', source: 'cost-calibration-model.md', conf: 'LOW', debit: true },
+ ]
+
+ // Journal entries
+ const journalEntries = journal.length > 0 ? journal : [{
+ day: 'Day 1 · Ostia',
+ text: 'The harbour smells of pitch and ambition. I have fifty denarii and a single battered ledger. The factor tells me the olive route to Capua is open. I shall begin there, as merchants have begun since the first ships crossed the Tyrrhenian.',
+ }]
+
+ // Action buttons
+ const actionButtons = [
+ { label: 'Dispatch galley', style: 'otivm-btn-dispatch', action: 'dispatch', disabled: busy || !selectedRoute },
+ { label: 'Take otium', style: 'otivm-btn-otium', action: 'otium', disabled: busy },
+ ]
+
+ function handleAction(action) {
+ if (action === 'dispatch') handleDispatch()
+ if (action === 'otium') handleOtium()
+ }
+
+ return (
+ <>
+ {/* Notification message */}
+ {message && (
+
+ {message}
+
+ )}
+
+ {/* LEFT column */}
+
+
+ ({ date: e.day, text: e.text }))}
+ collapsible={true}
+ />
+
+ {/* RIGHT column */}
+
+
+
+ >
+ )
+}