Vary required round sum by player count

3 players → -105, 4-6 → -110, 7-8 → -100. Adds requiredRoundSum()
to scoring.ts and threads it through isRoundScoreValid and the sum
display in EnterScores.

Co-Authored-By: Claude Sonnet 4.6 <noreply@anthropic.com>

src/game/scoring.ts

@@ -2,8 +2,15 @@ export function isIndividualScoreValid(n: number): boolean {
   return n % 5 === 0 && n <= 110
 }
 
+export function requiredRoundSum(playerCount: number): number {
+  if (playerCount === 3) return -105
+  if (playerCount >= 7) return -100
+  return -110
+}
+
 export function isRoundScoreValid(scores: number[]): boolean {
-  return scores.every(isIndividualScoreValid) && scores.reduce((a, b) => a + b, 0) === -110
+  return scores.every(isIndividualScoreValid)
+    && scores.reduce((a, b) => a + b, 0) === requiredRoundSum(scores.length)
 }
 
 // Returns totals[i][j] = cumulative score for player j after round i.

src/pages/EnterScores.tsx

@@ -2,7 +2,7 @@ import { useState } from 'react'
 import PageFrame from '../components/PageFrame'
 import PrimaryButton from '../components/PrimaryButton'
 import HelpModal from '../components/HelpModal'
-import { isIndividualScoreValid, isRoundScoreValid } from '../game/scoring'
+import { isIndividualScoreValid, isRoundScoreValid, requiredRoundSum } from '../game/scoring'
 import { type GameState } from '../types'
 import styles from './EnterScores.module.css'
 import sharedStyles from '../styles/shared.module.css'
@@ -33,6 +33,7 @@ export default function EnterScores({ game, onSubmit, onBack, initialValues }: P
     }))
   }
 
+  const target = requiredRoundSum(game.players.length)
   const parsed = values.map(v => parseInt(v, 10))
   const fieldError = values.map((v, i) => v !== '' && (isNaN(parsed[i]) || !isIndividualScoreValid(parsed[i])))
   const allFilled = parsed.every(n => !isNaN(n))
@@ -66,8 +67,8 @@ export default function EnterScores({ game, onSubmit, onBack, initialValues }: P
           />
         </div>
       ))}
-      <p className={`${styles.sumLine}${sum === -110 ? ` ${styles.sumValid}` : ''}`}>
+      <p className={`${styles.sumLine}${sum === target ? ` ${styles.sumValid}` : ''}`}>
-        Sum: {sum} / −110
+        Sum: {sum} / {target}
       </p>
     </PageFrame>
   )