  <p> Ping測定用システム</p>
        let pingIntervalToken = null, lastPingSentTime = 0;

        function generateUniqueRoomBase() { return `${window.location.hostname.replace(/[^a-zA-Z0-9]/g, "") || "localplayer"}_fps_room_`; }
        const ROOM_BASE_NAME = generateUniqueRoomBase(); let currentRoomNumber = 1; 
        const PEER_CONFIG = { config: { iceServers: [{ urls: 'stun:stun.l.google.com:19302' }, { urls: 'stun:stun1.l.google.com:19302' }] } };

<p>②マッチングシステム </p>
<p>function startMatching() {
            if (isConnecting) return; isConnecting = true; const targetRoomId = ROOM_BASE_NAME + currentRoomNumber; statusEl.innerText = `ACCESSING ROOM ${currentRoomNumber}...`;
            if (peer) peer.destroy(); peer = new Peer(PEER_CONFIG);
            peer.on('open', () => {
                const conn = peer.connect(targetRoomId);
                const connectTimeout = setTimeout(() => { if (!activeConn) { conn.close(); peer.destroy(); initHost(targetRoomId); } }, 1500);
                conn.on('open', () => { clearTimeout(connectTimeout); setTimeout(() => { if (!activeConn) { isConnecting = false; playerRole = "GUEST"; goToLobby(conn, "GUEST"); } }, 500); });
                conn.on('data', (data) => { if (data.type === "FULL") { clearTimeout(connectTimeout); conn.close(); currentRoomNumber++; isConnecting = false; startMatching(); } else { handleNetworkData(data); } });
                peer.on('error', (err) => { clearTimeout(connectTimeout); if (err.type === 'peer-unavailable') { peer.destroy(); initHost(targetRoomId); } else { isConnecting = false; setTimeout(startMatching, 1000); } });
            });
        }

        function initHost(targetRoomId) {
            peer = new Peer(targetRoomId, PEER_CONFIG);
            peer.on('open', () => { statusEl.innerText = "AWAITING OPPONENT..."; });
            peer.on('connection', (conn) => { if (activeConn) { conn.on('open', () => { conn.send({ type: "FULL" }); setTimeout(() => conn.close(), 500); }); return; } isConnecting = false; playerRole = "HOST"; goToLobby(conn, "HOST"); });
            peer.on('error', (err) => { isConnecting = false; currentRoomNumber++; startMatching(); });
        }

        function goToLobby(conn, role) {
            activeConn = conn; screenMatching.classList.add("hidden"); screenLobby.classList.remove("hidden"); matchPerfectEnded = false;
            document.getElementById("lobbyRoomName").innerText = `ROOM 0${currentRoomNumber} // ${role}`;
            document.getElementById("lobbyMyName").innerText = myPlayerName;
            
            setUIScreen("LOBBY");
            if (activeConn) activeConn.send({ type: "NAME_EXCHANGE", name: myPlayerName });

            conn.on('data', (data) => { handleNetworkData(data); });
            conn.on('close', () => { handleOpponentDisconnect(); });
            startLobbyTimer();

            // Ping定期計測開始
            clearInterval(pingIntervalToken);
            pingIntervalToken = setInterval(() => {
                if(activeConn && gameStarted) {
                    lastPingSentTime = performance.now();
                    activeConn.send({ type: "NET_PING" });
                }
            }, 2000);
        }

        function handleOpponentDisconnect() {
            if (matchPerfectEnded) return;
            clearInterval(lobbyTimerInterval); clearInterval(matchCountdownInterval); clearInterval(pingIntervalToken); cleanup3DGame();
            screenLobby.classList.add("hidden"); blocker.classList.add("hidden"); crosshair.classList.add("hidden"); hudContainer.classList.add("hidden"); scoreBoard.classList.add("hidden"); roundOverlay.innerText = ""; vsOverlay.classList.add("hidden");
            document.getElementById("resultTitle").innerText = "VICTORY"; document.getElementById("resultTitle").style.color = "#00ffaa";
            document.getElementById("resultReason").innerText = "対戦相手が抜けました。不戦勝です。"; screenResult.classList.remove("hidden");
            setUIScreen("RESULT");
        }

        function resetToMenu() {
            clearInterval(pingIntervalToken);
            if (activeConn) { activeConn.close(); activeConn = null; } if (peer) { peer.destroy(); peer = null; }
            amIReady = false; isEnemyReady = false; gameStarted = false; isConnecting = false; lobbyTimeoutCount = 10; currentRoomNumber = 1; matchPerfectEnded = false; enemyPlayerName = "OPPONENT";
            myStatusInd.innerText = "WAITING"; myStatusInd.classList.remove("ready"); enemyStatusInd.innerText = "WAITING"; enemyStatusInd.classList.remove("ready");
            readyBtn.innerText = "READY"; readyBtn.classList.remove("is-ready"); readyBtn.classList.remove("hidden");
            lobbyTimerEl.innerText = "AUTO START IN: 10s"; lobbyTimerEl.classList.remove("hidden"); countdownEl.classList.add("hidden"); document.getElementById("lobbyEnemyName").innerText = "ENEMY";
            cleanup3DGame(); screenResult.classList.add("hidden"); blocker.classList.add("hidden"); crosshair.classList.add("hidden"); hudContainer.classList.add("hidden"); scoreBoard.classList.add("hidden"); roundOverlay.innerText = ""; vsOverlay.classList.add("hidden"); screenMenu.classList.remove("hidden");
            setUIScreen("MENU");
        }

        function startLobbyTimer() { lobbyTimeoutCount = 10; clearInterval(lobbyTimerInterval); lobbyTimerInterval = setInterval(() => { lobbyTimeoutCount--; lobbyTimerEl.innerText = `AUTO START IN: ${lobbyTimeoutCount}s`; if (lobbyTimeoutCount <= 0) { clearInterval(lobbyTimerInterval); startMatchCountdown(); } }, 1000); }
        
        readyBtn.addEventListener('click', () => { 
            amIReady = !amIReady; readyBtn.innerText = amIReady ? "CANCEL READY" : "READY"; 
            if (amIReady) { readyBtn.classList.add("is-ready"); myStatusInd.innerText = "READY"; myStatusInd.classList.add("ready"); } 
            else { readyBtn.classList.remove("is-ready"); myStatusInd.innerText = "WAITING"; myStatusInd.classList.remove("ready"); } 
            if (activeConn) activeConn.send({ type: "READY_CHANGE", isReady: amIReady }); checkDirectStart(); 
        });
        
        function handleNetworkData(data) {
            if (data.type === "NAME_EXCHANGE") { enemyPlayerName = data.name; document.getElementById("lobbyEnemyName").innerText = enemyPlayerName; }
            else if (data.type === "READY_CHANGE") { isEnemyReady = data.isReady; if (isEnemyReady) { enemyStatusInd.innerText = "READY"; enemyStatusInd.classList.add("ready"); } else { enemyStatusInd.innerText = "WAITING"; enemyStatusInd.classList.remove("ready"); } checkDirectStart(); }
            else if (data.type === "GAME_SYNC") { if (enemyPlayerMesh) { enemyPlayerMesh.position.set(data.pos.x, data.pos.y - 2.0, data.pos.z); enemyPlayerMesh.rotation.y = data.rotY; } }
            else if (data.type === "GAME_SHOOT") { spawnBulletLaser(new THREE.Vector3().copy(data.from), new THREE.Vector3().copy(data.to)); }
            else if (data.type === "GAME_GRENADE_SPAWN") { spawnNetworkGrenade(data.id, new THREE.Vector3().copy(data.pos), new THREE.Vector3().copy(data.vel)); }
            else if (data.type === "GAME_GRENADE_EXPLODE") { triggerGrenadeExplosionEffects(new THREE.Vector3().copy(data.pos)); }
            else if (data.type === "GAME_DAMAGE") { 
                let currentPos = new THREE.Vector3(camera.position.x, camera.position.y - (isCrouching ? 0.9 : 0.3), camera.position.z);
                let hitOffset = new THREE.Vector3().copy(data.hitOffset);
                let predictedHitPoint = new THREE.Vector3().copy(currentPos).add(hitOffset);
                let distance = currentPos.distanceTo(predictedHitPoint);
                if (distance < 3.2) {
                    processReceivedDamage(data.amount); 
                }
            }
            else if (data.type === "GAME_EXPLOSION_DAMAGE") {
                let currentPos = new THREE.Vector3(camera.position.x, camera.position.y - (isCrouching ? 0.9 : 0.3), camera.position.z);
                let dist = currentPos.distanceTo(new THREE.Vector3().copy(data.pos));
                if (dist < 12.0) {
                    let damageCalc = Math.floor(65 * (1.0 - (dist / 12.0)));
                    if (damageCalc > 5) processReceivedDamage(damageCalc);
                }
            }
            else if (data.type === "GAME_POPUP") { triggerFortnitePopup(data.amount, data.isShield, new THREE.Vector3().copy(data.pos)); }
            else if (data.type === "ROUND_WINNER") { processRoundEnd(data.winner); }
            else if (data.type === "GAME_OVER") { matchPerfectEnded = true; endGame(data.winner === playerRole); }
            else if (data.type === "NET_PING") { if(activeConn) activeConn.send({ type: "NET_PONG" }); }
            else if (data.type === "NET_PONG") {
                let rtt = performance.now() - lastPingSentTime;
                pingDisplayEl.innerText = `PING: ${Math.round(rtt)}ms`;
            }
        }
        function checkDirectStart() { if (amIReady && isEnemyReady) { clearInterval(lobbyTimerInterval); startMatchCountdown(); } }
        function startMatchCountdown() { clearInterval(lobbyTimerInterval); clearInterval(matchCountdownInterval); lobbyTimerEl.classList.add("hidden"); readyBtn.classList.add("hidden"); countdownEl.classList.remove("hidden"); let count = 3; countdownEl.innerText = count; matchCountdownInterval = setInterval(() => { count--; if (count > 0) { countdownEl.innerText = count; } else { clearInterval(matchCountdownInterval); screenLobby.classList.add("hidden"); triggerVSEffect(); } }, 1000); }

        function triggerVSEffect() {
            document.getElementById("vsPlayer1").innerText = myPlayerName;
            document.getElementById("vsPlayer2").innerText = enemyPlayerName;
            vsOverlay.classList.remove("hidden");
            setTimeout(() => { vsOverlay.classList.add("hidden"); init3DGame(); }, 3000); 
        }</p>
 

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