kc3hack · Koseeee-27 · Feb 22, 2026 · Feb 22, 2026 · Feb 22, 2026 · Feb 22, 2026
diff --git a/frontend/public/sounds/check-box-se.mp3 b/frontend/public/sounds/check-box-se.mp3
diff --git a/frontend/public/sounds/game2-bgm.mp3 b/frontend/public/sounds/game2-bgm.mp3
diff --git a/frontend/public/sounds/game3-bgm.mp3 b/frontend/public/sounds/game3-bgm.mp3
diff --git a/frontend/public/sounds/general-button-se.mp3 b/frontend/public/sounds/general-button-se.mp3
diff --git a/frontend/public/sounds/result-bgm.mp3 b/frontend/public/sounds/result-bgm.mp3
diff --git a/frontend/public/sounds/start-bgm.mp3 b/frontend/public/sounds/start-bgm.mp3
diff --git a/frontend/src/app/page.tsx b/frontend/src/app/page.tsx
@@ -2,10 +2,10 @@
 
 import Image from 'next/image';
 import { useRouter } from 'next/navigation';
-import { useState } from 'react';
+import { useEffect, useRef, useState } from 'react';
 import type { CSSProperties } from 'react';
 
-//まる爆発アニメーションコンポーネント
+// --- まる爆発アニメーションコンポーネント ---
 const SparklesExplosion = () => {
   const count = 20;
   const colors = ['#e9eb7c', '#ee7ee6', '#6eb8ca', '#e17a78', '#91ec77'];
@@ -56,16 +56,51 @@ const SparklesExplosion = () => {
   );
 };
 
+// --- メインのトップページコンポーネント ---
 export default function TopPage() {
   const router = useRouter();
   const [showExplosion, setShowExplosion] = useState(false);
 
+  // BGMを保持するための Ref
+  const bgmRef = useRef<HTMLAudioElement | null>(null);
+
+  // BGMの初期化と再生管理
+  useEffect(() => {
+    // パスは public/sounds/start-bgm.mp3 を想定
+    const bgm = new Audio('/sounds/start-bgm.mp3');
+    bgm.loop = true;
+    bgm.volume = 0.4;
+    bgmRef.current = bgm;
+
+    const playBGM = () => {
+      bgm.play().catch(() => {
+        // 自動再生制限がかかった場合は何もしない
+      });
+      // 一度クリックされたらイベントリスナーを削除
+      window.removeEventListener('click', playBGM);
+    };
+
+    window.addEventListener('click', playBGM);
+
+    // クリーンアップ
+    return () => {
+      bgm.pause();
+      window.removeEventListener('click', playBGM);
+    };
+  }, []);
+
   const handleStartClick = () => {
     setShowExplosion(true);
 
+    // SEの再生（パスを修正）
     const audio = new Audio('/sounds/start-se.mp3');
     audio.play().catch(() => {});
 
+    // ボタン押下時にBGMを停止
+    if (bgmRef.current) {
+      bgmRef.current.pause();
+    }
+
     setTimeout(() => {
       router.push('/games/terms');
     }, 800);
@@ -76,7 +111,18 @@ export default function TopPage() {
   };
 
   return (
-    <div className="flex h-dvh w-full flex-col items-center justify-center overflow-hidden bg-top-pattern">
+    <div
+      className="flex h-dvh w-full flex-col items-center justify-center overflow-hidden bg-top-pattern"
+      style={{
+        backgroundImage: `
+          radial-gradient(circle, rgba(255,255,255,0.8) 1.0px, transparent 4px),
+          url('/images/bg-pattern.svg')
+        `,
+        backgroundSize: '16px 16px, cover',
+        backgroundPosition: '0 0, center',
+        backgroundRepeat: 'repeat, no-repeat',
+      }}
+    >
       <div className="flex flex-col items-center gap-[2vh] w-full">
         <Image
           src="/images/RealYouLogo.png"

diff --git a/frontend/src/features/diagnosis/components/BaselineSurvey.tsx b/frontend/src/features/diagnosis/components/BaselineSurvey.tsx
@@ -1,6 +1,6 @@
 'use client';
 
-import { useState, useCallback } from 'react';
+import { useState, useCallback, useEffect, useRef } from 'react';
 import { useAtomValue } from 'jotai';
 import { useRouter } from 'next/navigation';
 import { mbtiAtom } from '@/stores/diagnosis';
@@ -22,6 +22,35 @@ export default function BaselineSurvey() {
   const mbti = useAtomValue(mbtiAtom);
   const game1Data = useAtomValue(game1DataAtom);
 
+  const bgmRef = useRef<HTMLAudioElement | null>(null);
+
+  const playSE = useCallback((path: string) => {
+    const audio = new Audio(path);
+    audio.volume = 0.5;
+    audio.play().catch(() => {});
+  }, []);
+
+  // BGMの初期化と再生管理
+  useEffect(() => {
+    const bgm = new Audio('/sounds/start-bgm.mp3');
+    bgm.loop = true;
+    bgm.volume = 0.4;
+    bgmRef.current = bgm;
+
+    const playBGM = () => {
+      bgm.play().catch(() => {});
+      window.removeEventListener('click', playBGM);
+    };
+
+    window.addEventListener('click', playBGM);
+    playBGM();
+
+    return () => {
+      bgm.pause();
+      window.removeEventListener('click', playBGM);
+    };
+  }, []);
+
   const [currentIndex, setCurrentIndex] = useState(0);
   const [answers, setAnswers] = useState<
     Partial<Record<QuestionKey, AnswerOption>>
@@ -66,6 +95,7 @@ export default function BaselineSurvey() {
   const handleAnswer = (value: AnswerOption) => {
     const newAnswers = { ...answers, [currentQuestion.key]: value };
     setAnswers(newAnswers);
+    playSE('/sounds/general-button-se.mp3');
 
     if (currentIndex < totalQuestions - 1) {
       setCurrentIndex((prev) => prev + 1);
@@ -75,6 +105,7 @@ export default function BaselineSurvey() {
   };
 
   const handleRetry = () => {
+    playSE('/sounds/general-button-se.mp3');
     submitToApi(answers as BaselineAnswers);
   };
 

diff --git a/frontend/src/features/diagnosis/components/MbtiSelect.tsx b/frontend/src/features/diagnosis/components/MbtiSelect.tsx
@@ -1,7 +1,7 @@
 'use client';
 
 import Image from 'next/image';
-import { useState, useCallback } from 'react';
+import { useState, useCallback, useEffect, useRef } from 'react';
 import { flushSync } from 'react-dom';
 import { motion, AnimatePresence } from 'framer-motion';
 import { useSetAtom } from 'jotai';
@@ -39,6 +39,36 @@ export default function MbtiSelect() {
   const [transitionVia, setTransitionVia] = useState<
     'tab' | 'arrow-left' | 'arrow-right'
   >('tab');
+  const bgmRef = useRef<HTMLAudioElement | null>(null);
+
+  const playSE = useCallback((path: string) => {
+    const audio = new Audio(path);
+    audio.volume = 0.5;
+    audio.play().catch(() => {});
+  }, []);
+
+  // BGMの初期化と再生管理
+  useEffect(() => {
+    // TopPageと同じ start-bgm を使用
+    const bgm = new Audio('/sounds/start-bgm.mp3');
+    bgm.loop = true;
+    bgm.volume = 0.4;
+    bgmRef.current = bgm;
+
+    const playBGM = () => {
+      bgm.play().catch(() => {});
+      window.removeEventListener('click', playBGM);
+    };
+
+    window.addEventListener('click', playBGM);
+    // すでに他のページでインタラクションがあれば即再生される
+    playBGM();
+
+    return () => {
+      bgm.pause();
+      window.removeEventListener('click', playBGM);
+    };
+  }, []);
 
   const currentGroup = MBTI_GROUPS[groupIndex];
   const currentTypes = getTypesByGroup(currentGroup);
@@ -54,33 +84,39 @@ export default function MbtiSelect() {
       flushSync(() => setTransitionVia('tab'));
       setGroupIndex(index);
       setSelected(null);
+      playSE('/sounds/general-button-se.mp3');
     },
-    [groupIndex]
+    [groupIndex, playSE]
   );
 
   const handleArrowPrev = useCallback(() => {
     setTransitionVia('arrow-right'); // コンテンツは右から入る
     setGroupIndex((i) => (i - 1 + MBTI_GROUPS.length) % MBTI_GROUPS.length);
     setSelected(null);
-  }, []);
+    playSE('/sounds/general-button-se.mp3');
+  }, [playSE]);
 
   const handleArrowNext = useCallback(() => {
     setTransitionVia('arrow-left'); // コンテンツは左から入る
     setGroupIndex((i) => (i + 1) % MBTI_GROUPS.length);
     setSelected(null);
-  }, []);
+    playSE('/sounds/general-button-se.mp3');
+  }, [playSE]);
 
   const handleConfirm = () => {
+    playSE('/sounds/general-button-se.mp3');
     if (!selected) return;
     setMbti(selected);
     setStep('quiz');
   };
 
   const handleReselect = () => {
+    playSE('/sounds/general-button-se.mp3');
     setSelected(null);
   };
 
   const handleSkip = () => {
+    playSE('/sounds/general-button-se.mp3');
     setMbti(null);
     setStep('quiz');
   };
@@ -184,7 +220,10 @@ export default function MbtiSelect() {
                       <motion.button
                         key={type.code}
                         type="button"
-                        onClick={() => setSelected(type.code)}
+                        onClick={() => {
+                          setSelected(type.code);
+                          playSE('/sounds/general-button-se.mp3');
+                        }}
                         className="relative z-0 flex flex-1 basis-0 flex-col cursor-pointer items-center justify-center overflow-hidden rounded-4xl border-2 border-gray-800 bg-white/80 outline-none ring-0 hover:z-50"
                         whileHover={{
                           scale: 1.2,

diff --git a/frontend/src/features/games/group-chat/components/GroupChatGameFlow.tsx b/frontend/src/features/games/group-chat/components/GroupChatGameFlow.tsx
@@ -24,6 +24,36 @@ export default function GroupChatGameFlow() {
   const chatEndRef = useRef<HTMLDivElement>(null);
   const [submitStatus, setSubmitStatus] = useState<SubmitStatus>('loading');
   const pendingDataRef = useRef<Game3Data | null>(null);
+  const bgmRef = useRef<HTMLAudioElement | null>(null);
+
+  const playSE = useCallback((path: string) => {
+    const audio = new Audio(path);
+    audio.volume = 0.5;
+    audio.play().catch(() => {});
+  }, []);
+
+  // BGMの初期化と再生管理
+  useEffect(() => {
+    // 指示はgame2でしたが、Game3の画面のためgame3-bgm.mp3を適用します
+    const bgm = new Audio('/sounds/game3-bgm.mp3');
+    bgm.loop = true;
+    bgm.volume = 0.3;
+    bgmRef.current = bgm;
+
+    const playBGM = () => {
+      bgm.play().catch(() => {});
+      window.removeEventListener('click', playBGM);
+    };
+
+    window.addEventListener('click', playBGM);
+    // 前の画面から継続している場合は即再生
+    playBGM();
+
+    return () => {
+      bgm.pause();
+      window.removeEventListener('click', playBGM);
+    };
+  }, []);
 
   const submitGame3 = useCallback(async (data: Game3Data) => {
     const userId = localStorage.getItem('user_id');
@@ -43,6 +73,7 @@ export default function GroupChatGameFlow() {
       try {
         await submitGame3(data);
         setSubmitStatus('success');
+        bgmRef.current?.pause();
         setTimeout(() => {
           router.push('/result');
         }, 2000);
@@ -54,19 +85,21 @@ export default function GroupChatGameFlow() {
   );
 
   const handleRetry = useCallback(async () => {
+    playSE('/sounds/general-button-se.mp3'); // リトライ音
     const data = pendingDataRef.current;
     if (!data) return;
     setSubmitStatus('loading');
     try {
       await submitGame3(data);
       setSubmitStatus('success');
+      bgmRef.current?.pause();
       setTimeout(() => {
         router.push('/result');
       }, 2000);
     } catch {
       setSubmitStatus('error');
     }
-  }, [router, submitGame3]);
+  }, [router, submitGame3, playSE]);
 
   const {
     gamePhase,
@@ -76,14 +109,28 @@ export default function GroupChatGameFlow() {
     remainingTimeMs,
     isTypingIndicatorVisible,
     typingBotName,
-    startGame,
-    selectOption,
+    startGame: originalStartGame, // 名前を変更してラップ
+    selectOption: originalSelectOption, // 名前を変更してラップ
     handleOptionHover,
     stageTimeLimitMs,
     groupName,
     groupMemberCount,
   } = useGroupChatGame({ onComplete: handleComplete });
 
+  // サウンドを鳴らすようにラップ
+  const startGame = useCallback(() => {
+    playSE('/sounds/general-button-se.mp3');
+    originalStartGame();
+  }, [originalStartGame, playSE]);
+
+  const selectOption = useCallback(
+    (optionId: number) => {
+      playSE('/sounds/general-button-se.mp3');
+      originalSelectOption(optionId);
+    },
+    [originalSelectOption, playSE]
+  );
+
   useEffect(() => {
     chatEndRef.current?.scrollIntoView({ behavior: 'smooth' });
   }, [chatMessages, isTypingIndicatorVisible, gamePhase]);