Blame for static/js/player.js

        const cfg = window.TELEARN_PLAYER || {};
        const className = cfg.className || "";
        const studentName = cfg.studentName || "";
        const studentToken = cfg.studentToken || "";
        const projectName = cfg.projectName || "";
        const projectType = cfg.projectType || "";
        const externalUrl = cfg.externalUrl || "";
        const apkName = cfg.apkName || "";
        const apkSize = cfg.apkSize || "";
        const appetizeKey = cfg.appetizeKey || "";
        const viewOnly = !!cfg.viewOnly;
        const sessionTimeoutSec = cfg.sessionTimeoutSec || 900;
        const idleWarningSec = cfg.idleWarningSec || 600;
        const idleTimeoutSec = cfg.idleTimeoutSec || 720;
        const heartbeatIntervalSec = cfg.heartbeatIntervalSec || 20;

        const viewportFrame = document.getElementById("viewport-frame");
        const focusPrompt = document.getElementById("focus-prompt-el");
        const consoleLogs = document.getElementById("console-logs");
        const statusWrapper = document.getElementById("server-status");
        const statusText = document.getElementById("status-text");
        const btnToggleWebcam = document.getElementById("btn-toggle-webcam");
        const webcamVideo = document.getElementById("webcam-video");
        const webcamCanvas = document.getElementById("webcam-canvas");
        const webcamCtx = webcamCanvas.getContext("2d");
        const idleDialog = document.getElementById("idle-dialog");
        const idleCountdown = document.getElementById("idle-countdown");
        const btnContinueSession = document.getElementById("btn-continue-session");

        let socket = null;
        let oldUrl = null;
        let webcamStream = null;
        let webcamInterval = null;
        let isWebcamStreaming = false;
        let isFocused = false;
        let heartbeatTimer = null;
        let idleCountdownTimer = null;
        let idleDeadline = 0;
        let lastActivitySentAt = 0;
        let stopReason = null;

        function sendSocketMessage(message) {
            if (!socket || socket.readyState !== WebSocket.OPEN) return false;
            socket.send(JSON.stringify(message));
            return true;
        }

        function sendActivity(force = false) {
            const now = Date.now();
            if (!force && now - lastActivitySentAt < 10000) return;
            if (sendSocketMessage({ type: "activity" })) {
                lastActivitySentAt = now;
                hideIdleWarning();
            }
        }

        function startHeartbeat() {
            stopHeartbeat();
            heartbeatTimer = setInterval(() => {
                sendSocketMessage({ type: "heartbeat" });
            }, heartbeatIntervalSec * 1000);
        }

        function stopHeartbeat() {
            if (heartbeatTimer) {
                clearInterval(heartbeatTimer);
                heartbeatTimer = null;
            }
        }

        function formatCountdown(seconds) {
            const safeSeconds = Math.max(0, Math.ceil(seconds));
            const minutes = Math.floor(safeSeconds / 60);
            return `${minutes}:${String(safeSeconds % 60).padStart(2, "0")}`;
        }

        function showIdleWarning(remainingSec) {
            if (!idleDialog) return;
            idleDeadline = Date.now() + Math.max(0, remainingSec) * 1000;
            idleDialog.hidden = false;
            updateIdleCountdown();
            if (idleCountdownTimer) clearInterval(idleCountdownTimer);
            idleCountdownTimer = setInterval(updateIdleCountdown, 250);
            if (btnContinueSession) btnContinueSession.focus();
        }

        function updateIdleCountdown() {
            if (!idleCountdown) return;
            idleCountdown.textContent = formatCountdown((idleDeadline - Date.now()) / 1000);
        }

        function hideIdleWarning() {
            if (idleDialog) idleDialog.hidden = true;
            if (idleCountdownTimer) {
                clearInterval(idleCountdownTimer);
                idleCountdownTimer = null;
            }
        }

        function setupActivityTracking() {
            ["pointerdown", "pointermove", "keydown", "touchstart", "scroll"].forEach((eventName) => {
                window.addEventListener(eventName, () => sendActivity(), { passive: true });
            });
            document.addEventListener("visibilitychange", () => {
                if (!document.hidden) sendActivity(true);
            });
            if (btnContinueSession) {
                btnContinueSession.addEventListener("click", () => sendActivity(true));
            }
        }

        // Auto-transform Scratch URLs into embed links
        function formatEmbedUrl(url) {
            if (url.includes("scratch.mit.edu/projects/")) {
                const matches = url.match(/\/projects\/(\d+)/);
                if (matches && matches[1]) {
                    return `https://scratch.mit.edu/projects/${matches[1]}/embed`;
                }
            }
            return url;
        }

        // Initialize view based on project type
        function initViewport() {
            const layout = document.getElementById("player-layout");
            const sidePanel = document.getElementById("side-panel");

            if (projectType === "python") {
                if (viewOnly) {
                    statusWrapper.classList.remove("status-connecting");
                    statusWrapper.classList.add("status-idle");
                    statusText.innerText = "僅供預覽";
                    document.getElementById("python-device-section").style.display = "none";
                    const img = document.createElement("div");
                    img.style.cssText = "color:#94a3b8;text-align:center;padding:2rem;max-width:28rem;line-height:1.6;";
                    const title = document.createElement("h3");
                    title.textContent = projectName;
                    title.style.cssText = "color:#fff;margin-bottom:0.75rem;";
                    const identity = document.createElement("p");
                    identity.textContent = `班級：${className}｜學生：${studentName}`;
                    const note = document.createElement("p");
                    note.style.cssText = "margin-top:1rem;font-size:0.9rem;";
                    note.append("此連結為「僅預覽」模式，不會在伺服器上執行程式。若要實際操作，請使用不含 ");
                    const query = document.createElement("code");
                    query.textContent = "?view=1";
                    note.append(query, " 的連結。");
                    img.append(title, identity, note);
                    viewportFrame.appendChild(img);
                    appendConsole("[系統] view=1 僅預覽模式，未啟動執行器。\n");
                } else {
                    const img = document.createElement("img");
                    img.id = "game-screen";
                    img.src = "data:image/svg+xml;utf8,<svg xmlns='http://www.w3.org/2000/svg' width='640' height='480' viewBox='0 0 640 480'><rect width='100%' height='100%' fill='%23000'/><text x='50%' y='50%' font-size='20' fill='%2394a3b8' text-anchor='middle' font-family='sans-serif'>正在與伺服器建立連接...</text></svg>";
                    img.tabIndex = 1;
                    viewportFrame.appendChild(img);
                    focusPrompt.style.display = "flex";
                    setLoading(true, "正在與伺服器建立連線…", "啟動 headless 執行器與模型載入中");
                    setupPythonControls(img);
                    connectWebSocket();
                }
            } else if (projectType === "apk") {
                // Hide Python sections, show APK sections
                document.getElementById("python-device-section").style.display = "none";
                document.getElementById("python-terminal-section").style.display = "none";
                statusWrapper.style.display = "none";
                
                const apkInfoSec = document.getElementById("apk-info-section");
                apkInfoSec.style.display = "flex";

                // Setup downloads & sizes
                const dlUrl = window.location.origin + `/static_projects/${encodeURIComponent(studentToken)}/${encodeURIComponent(projectName)}/${encodeURIComponent(apkName)}`;
                document.getElementById("btn-apk-download").href = dlUrl;
                document.getElementById("apk-file-label").innerText = apkName;
                document.getElementById("apk-size-label").innerText = apkSize ? `檔案大小: ${apkSize}` : "已偵測到安裝檔";

                // Generate QR code
                const qrUrl = `https://api.qrserver.com/v1/create-qr-code/?size=180x180&data=${encodeURIComponent(dlUrl)}`;
                const apkQrImage = document.createElement("img");
                apkQrImage.src = qrUrl;
                apkQrImage.alt = "QR Code";
                document.getElementById("apk-qr-image").replaceChildren(apkQrImage);

                // Setup Phone mockup
                viewportFrame.classList.add("iframe-mode");
                viewportFrame.style.background = "transparent";
                viewportFrame.style.boxShadow = "none";
                viewportFrame.style.border = "none";
                viewportFrame.style.padding = "0";

                const phone = document.createElement("div");
                phone.className = "phone-mockup";

                const speaker = document.createElement("div");
                speaker.className = "phone-speaker";
                phone.appendChild(speaker);

                const camera = document.createElement("div");
                camera.className = "phone-camera";
                phone.appendChild(camera);

                const statusBar = document.createElement("div");
                statusBar.className = "phone-status-bar";
                statusBar.innerHTML = `
                    <span>14:30</span>
                    <div style="display:flex; gap: 4px; align-items:center;">
                        <svg width="12" height="12" viewBox="0 0 24 24" fill="currentColor"><path d="M12 3c-4.97 0-9 4.03-9 9 0 2.12.74 4.07 1.97 5.61L4.35 19.4c3.9 3.9 10.2 3.9 14.1 0l-1.62-1.62C18.26 16.07 19 14.12 19 12c0-4.97-4.03-9-9-9z"/></svg>
                        <svg width="12" height="12" viewBox="0 0 24 24" fill="currentColor"><path d="M12 2C6.48 2 2 6.48 2 12s4.48 10 10 10 10-4.48 10-10S17.52 2 12 2zm1 15h-2v-6h2v6zm0-8h-2V7h2v2z"/></svg>
                    </div>
                `;
                phone.appendChild(statusBar);

                const screen = document.createElement("div");
                screen.className = "phone-screen";

                if (appetizeKey) {
                    const iframe = document.createElement("iframe");
                    iframe.className = "phone-screen-iframe";
                    iframe.src = `https://appetize.io/embed/${encodeURIComponent(appetizeKey)}?device=pixel4&scale=auto&autoplay=false&orientation=portrait&deviceColor=black`;
                    iframe.referrerPolicy = "no-referrer";
                    screen.appendChild(iframe);
                } else {
                    screen.innerHTML = `
                        <div class="android-icon-wrapper">
                            <svg width="40" height="40" viewBox="0 0 24 24" fill="none" stroke="#ef8068" stroke-width="1.8">
                                <path d="M4 10v6m16-6v6M6 18c0 1.1.9 2 2 2h8c1.1 0 2-.9 2-2V9H6v9zm3-13l-1.5-2M15 5l1.5-2M9 13v.01M15 13v.01" stroke-linecap="round" stroke-linejoin="round"/>
                            </svg>
                        </div>
                        <div>
                            <h4 id="apk-project-title" style="font-weight: 800; font-size: 1.25rem; color: #ffffff; margin-bottom: 0.5rem; text-shadow: 0 2px 4px rgba(0,0,0,0.3);"></h4>
                            <p style="font-size: 0.8rem; color: rgba(255,255,255,0.7); line-height: 1.4; padding: 0 1rem;">本專案為 Android 應用程式</p>
                        </div>
                        <div style="background: rgba(0,0,0,0.2); border: 1px solid rgba(255,255,255,0.05); padding: 0.8rem; border-radius: 12px; width: 100%; box-sizing: border-box; display: flex; flex-direction: column; align-items: center; gap: 8px;">
                            <span style="font-size: 0.72rem; color: var(--text-muted); line-height: 1.3;">掃描此條碼以安裝至您的實體手機</span>
                            <div id="apk-qr-slot"></div>
                        </div>
                        <a id="apk-download-link" class="btn-launch btn-launch-apk" style="text-decoration: none; width: 100%; font-size: 0.82rem;" download>
                            下載 APK 安裝檔
                        </a>
                    `;
                    screen.querySelector("#apk-project-title").textContent = projectName;
                    const qrImage = document.createElement("img");
                    qrImage.src = qrUrl;
                    qrImage.alt = "QR Code";
                    qrImage.style.cssText = "width:100px;height:100px;border-radius:6px;border:4px solid #fff;display:block;";
                    screen.querySelector("#apk-qr-slot").append(qrImage);
                    screen.querySelector("#apk-download-link").href = dlUrl;
                }
                phone.appendChild(screen);
                viewportFrame.appendChild(phone);

                if (appetizeKey) {
                    const helper = document.createElement("div");
                    helper.style.marginTop = "1rem";
                    helper.style.fontSize = "0.85rem";
                    helper.style.color = "var(--text-muted)";
                    helper.style.textAlign = "center";
                    helper.style.maxWidth = "320px";
                    helper.style.lineHeight = "1.5";
                    helper.append("⚠️ 因 Appetize.io 免費方案限制內嵌功能，若畫面顯示「未啟用內嵌」，請 ");
                    const openAppetize = document.createElement("a");
                    openAppetize.href = `https://appetize.io/app/${encodeURIComponent(appetizeKey)}`;
                    openAppetize.target = "_blank";
                    openAppetize.rel = "noopener noreferrer";
                    openAppetize.textContent = "點此在新分頁中打開模擬器";
                    openAppetize.style.cssText = "color:#ef8068;text-decoration:underline;font-weight:600;";
                    helper.append(openAppetize, "。");
                    viewportFrame.appendChild(helper);
                }
            } else {
                // Web based game (HTML or External Link)
                // Hide side controls and console log panel, render full viewport width
                sidePanel.style.display = "none";
                layout.style.gridTemplateColumns = "1fr";
                statusWrapper.style.display = "none";

                if (projectType === "html") {
                    viewportFrame.classList.add("iframe-mode");
                    const iframe = document.createElement("iframe");
                    iframe.className = "iframe-viewport";
                    iframe.setAttribute("sandbox", "allow-scripts allow-forms allow-pointer-lock");
                    iframe.referrerPolicy = "no-referrer";
                    iframe.allow = "autoplay; fullscreen";
                    iframe.src = `/static_projects/${encodeURIComponent(studentToken)}/${encodeURIComponent(projectName)}/index.html`;
                    viewportFrame.appendChild(iframe);
                } else if (projectType === "external") {
                    // MakeCode supports an interactive shared-project page. Use a
                    // credentialless iframe so the app can load under this
                    // platform's cross-origin isolation headers.
                    const isMakeCode = /(^|\.)makecode\.com$/i.test(new URL(externalUrl).hostname);
                    if (isMakeCode) {
                        viewportFrame.classList.add("iframe-mode");
                        const iframe = document.createElement("iframe");
                        iframe.className = "iframe-viewport";
                        iframe.allow = "autoplay; fullscreen; gamepad";
                        iframe.setAttribute("allowfullscreen", "true");
                        iframe.setAttribute("credentialless", "");
                        iframe.referrerPolicy = "no-referrer";
                        iframe.src = externalUrl;
                        viewportFrame.appendChild(iframe);
                        return;
                    }

                    // Other external sites may send restrictive frame headers;
                    // open them directly instead of embedding an iframe.
                    const card = document.createElement("div");
                    card.style.cssText = "display:flex;flex-direction:column;align-items:center;justify-content:center;gap:1rem;min-height:18rem;padding:2rem;text-align:center;color:#e5eefb;";
                    const title = document.createElement("h2");
                    title.textContent = projectName;
                    title.style.margin = "0";
                    const note = document.createElement("p");
                    note.textContent = "此作品位於外部網站，請點擊按鈕開啟。";
                    note.style.cssText = "margin:0;color:#94a3b8;";
                    const link = document.createElement("a");
                    link.href = formatEmbedUrl(externalUrl);
                    link.target = "_blank";
                    link.rel = "noopener noreferrer";
                    link.className = "btn-launch btn-launch-html";
                    link.textContent = "開啟作品 ↗";
                    card.append(title, note, link);
                    viewportFrame.appendChild(card);
                }
            }
        }

        // Connect Pygame/OpenCV WebSocket server
        function connectWebSocket() {
            const loc = window.location;
            const wsProto = loc.protocol === "https:" ? "wss:" : "ws:";
            const wsUrl = `${wsProto}//${loc.host}/ws/play/${encodeURIComponent(studentToken)}/${encodeURIComponent(projectName)}`;
            
            socket = new WebSocket(wsUrl);
            socket.binaryType = "blob";
            stopReason = null;

            socket.onopen = () => {
                statusWrapper.classList.remove("status-stopped", "status-connecting", "status-idle");
                statusWrapper.classList.add("status-running");
                statusText.innerText = "已連線 (運作中)";
                appendConsole("[系統] 連線成功，學生專案已啟動。\n");
                appendConsole(`[系統] 閒置 ${Math.round(idleWarningSec/60)} 分鐘會提醒，${Math.round(idleTimeoutSec/60)} 分鐘後自動釋放名額。\n`);
                setLoading(true, "專案執行中…", `閒置 ${Math.round(idleTimeoutSec/60)} 分鐘會自動結束`);
                sendActivity(true);
                startHeartbeat();
                // Hide loading once first frame or after short delay
                setTimeout(() => setLoading(false), 2500);
            };

            socket.onmessage = (event) => {
                const gameScreen = document.getElementById("game-screen");
                if (event.data instanceof Blob) {
                    const url = URL.createObjectURL(event.data);
                    if (gameScreen) {
                        gameScreen.src = url;
                    }
                    if (oldUrl) {
                        URL.revokeObjectURL(oldUrl);
                    }
                    oldUrl = url;
                    setLoading(false);
                } else {
                    try {
                        const data = JSON.parse(event.data);
                        if (data.type === "log") {
                            appendConsole(data.data);
                        } else if (data.type === "idle_warning") {
                            showIdleWarning(data.remaining_sec || 0);
                        } else if (data.type === "idle_resumed") {
                            hideIdleWarning();
                        } else if (data.type === "status") {
                            if (["stopped", "timeout", "idle_timeout", "connection_timeout", "error", "busy", "rate_limited"].includes(data.data)) {
                                setStoppedStatus(data.data);
                                setLoading(false);
                            } else if (data.data === "running") {
                                statusWrapper.classList.remove("status-stopped", "status-connecting", "status-idle");
                                statusWrapper.classList.add("status-running");
                                statusText.innerText = "已連線 (運作中)";
                            }
                        }
                    } catch (e) {
                        console.error("JSON error:", e);
                    }
                }
            };

            socket.onclose = () => {
                stopHeartbeat();
                hideIdleWarning();
                setStoppedStatus(stopReason);
                if (!stopReason) {
                    appendConsole("\n[系統] 與伺服器的通訊中斷。\n");
                }
            };

            socket.onerror = () => {
                appendConsole(`\n[系統] 連線錯誤。\n`);
            };
        }

        function setStoppedStatus(reason) {
            if (reason) stopReason = reason;
            statusWrapper.classList.remove("status-running", "status-connecting", "status-idle");
            statusWrapper.classList.add("status-stopped");
            const labels = {
                stopped: "已停止",
                timeout: "已達執行上限",
                idle_timeout: "閒置結束",
                connection_timeout: "連線已離開",
                error: "錯誤",
                busy: "名額已滿",
                rate_limited: "啟動太頻繁"
            };
            statusText.innerText = labels[reason] || "已停止";
            stopWebcamStream();
            stopHeartbeat();
            hideIdleWarning();
            setLoading(false);
        }

        function setLoading(show, title, sub) {
            const el = document.getElementById("loading-overlay");
            if (!el) return;
            el.style.display = show ? "flex" : "none";
            const t = document.getElementById("loading-text");
            const s = document.getElementById("loading-sub");
            if (title && t) t.textContent = title;
            if (sub && s) s.textContent = sub;
        }

        function showWebcamDenied(msg) {
            const el = document.getElementById("webcam-denied");
            if (!el) return;
            el.style.display = "block";
            const m = document.getElementById("webcam-denied-msg");
            if (m && msg) m.textContent = msg;
        }

        function hideWebcamDenied() {
            const el = document.getElementById("webcam-denied");
            if (el) el.style.display = "none";
        }

        function restartProject() {
            appendConsole("\n[系統] 正在重新啟動專案...\n");
            if (socket) {
                socket.close();
            }
            setTimeout(connectWebSocket, 1000);
        }

        function stopProjectElegant() {
            appendConsole("\n[系統] 正在發送退出訊號並結束專案...\n");
            if (projectType === "python" && socket && socket.readyState === WebSocket.OPEN) {
                socket.send(JSON.stringify({
                    type: "pygame_quit"
                }));
                // Wait 1.5s before closing to let Pygame script do graceful cleanup
                setTimeout(() => {
                    window.close();
                }, 1500);
            } else {
                window.close();
            }
        }

        function appendConsole(text) {
            if (consoleLogs) {
                consoleLogs.textContent += text;
                consoleLogs.scrollTop = consoleLogs.scrollHeight;
            }
        }

        function clearConsole() {
            if (consoleLogs) consoleLogs.textContent = "";
        }

        // Setup mouse and keyboard input triggers for Python
        function setupPythonControls(gameScreen) {
            gameScreen.addEventListener("focus", () => {
                isFocused = true;
                focusPrompt.classList.add("active");
                focusPrompt.querySelector("span").innerText = "控制已啟用 (按 ESC 解除鎖定)";
            });

            gameScreen.addEventListener("blur", () => {
                isFocused = false;
                focusPrompt.classList.remove("active");
                focusPrompt.querySelector("span").innerText = "點選畫面啟用鍵盤/滑鼠控制";
            });

            gameScreen.addEventListener("click", (e) => {
                gameScreen.focus();
                e.preventDefault();
            });

            window.addEventListener("keydown", (e) => {
                if (isFocused && ["Space", "ArrowUp", "ArrowDown", "ArrowLeft", "ArrowRight"].includes(e.code)) {
                    e.preventDefault();
                }
            });

            window.addEventListener("keydown", (event) => {
                if (!isFocused || !socket || socket.readyState !== WebSocket.OPEN) return;
                
                if (event.key === "Escape") {
                    gameScreen.blur();
                    return;
                }

                socket.send(JSON.stringify({
                    type: "keydown",
                    key: event.key,
                    unicode: event.key.length === 1 ? event.key : ""
                }));

                socket.send(JSON.stringify({
                    type: "cv2key",
                    keyCode: event.key.charCodeAt(0) || -1
                }));
            });

            window.addEventListener("keyup", (event) => {
                if (!isFocused || !socket || socket.readyState !== WebSocket.OPEN) return;
                socket.send(JSON.stringify({
                    type: "keyup",
                    key: event.key
                }));
            });

            function sendMouseEvent(type, event) {
                if (!socket || socket.readyState !== WebSocket.OPEN) return;

                const rect = gameScreen.getBoundingClientRect();
                const scaleX = gameScreen.naturalWidth / rect.width;
                const scaleY = gameScreen.naturalHeight / rect.height;

                const x = Math.round((event.clientX - rect.left) * scaleX);
                const y = Math.round((event.clientY - rect.top) * scaleY);

                socket.send(JSON.stringify({
                    type: type,
                    x: x,
                    y: y,
                    button: event.button,
                    btnLeft: (event.buttons & 1) === 1,
                    btnMiddle: (event.buttons & 4) === 4,
                    btnRight: (event.buttons & 2) === 2
                }));
            }

            gameScreen.addEventListener("mousemove", (e) => sendMouseEvent("mousemove", e));
            gameScreen.addEventListener("mousedown", (e) => sendMouseEvent("mousedown", e));
            gameScreen.addEventListener("mouseup", (e) => sendMouseEvent("mouseup", e));
            gameScreen.addEventListener("dragstart", (e) => e.preventDefault());
        }

        // ----------------- Webcam Capture -----------------
        if (btnToggleWebcam) {
            btnToggleWebcam.addEventListener("click", () => {
                if (isWebcamStreaming) {
                    stopWebcamStream();
                } else {
                    startWebcamStream();
                }
            });
        }

        async function startWebcamStream() {
            try {
                hideWebcamDenied();
                appendConsole("[系統] 正在取得本機相機鏡頭權限...\n");
                if (!navigator.mediaDevices || !navigator.mediaDevices.getUserMedia) {
                    throw new Error("此瀏覽器不支援 getUserMedia，請改用 Chrome/Edge，並以 HTTPS 或 localhost 開啟。");
                }
                webcamStream = await navigator.mediaDevices.getUserMedia({
                    video: {
                        width: { ideal: 480, max: 640 },
                        height: { ideal: 360, max: 480 },
                        frameRate: { ideal: 12, max: 15 }
                    },
                    audio: false
                });
                webcamVideo.srcObject = webcamStream;
                // Match canvas to lower resolution for upload bandwidth
                webcamCanvas.width = 480;
                webcamCanvas.height = 360;
                btnToggleWebcam.classList.add("active");
                btnToggleWebcam.innerText = "關閉視訊鏡頭";
                isWebcamStreaming = true;
                appendConsole("[系統] Webcam 開啟成功，開始串流影格（480p）。\n");
                webcamInterval = setInterval(captureWebcamFrame, 80);
            } catch (err) {
                console.error("Camera error:", err);
                const hint = (err && err.name === "NotAllowedError")
                    ? "您已拒絕攝影機權限。請點網址列旁的相機圖示允許後再試。若使用遠端網址，需 HTTPS。"
                    : `開啟鏡頭失敗: ${err.message || err}。請確認使用 HTTPS 或 localhost，並允許瀏覽器存取攝影機。系統將使用虛擬測試影像。`;
                appendConsole(`[系統] ${hint}\n`);
                showWebcamDenied(hint);
                stopWebcamStream();
            }
        }

        function stopWebcamStream() {
            if (webcamInterval) {
                clearInterval(webcamInterval);
                webcamInterval = null;
            }
            if (webcamStream) {
                webcamStream.getTracks().forEach(track => track.stop());
                webcamStream = null;
            }
            webcamVideo.srcObject = null;
            if (btnToggleWebcam) {
                btnToggleWebcam.classList.remove("active");
                btnToggleWebcam.innerText = "啟用 Webcam 影像串流";
            }
            isWebcamStreaming = false;
        }

        function captureWebcamFrame() {
            if (!socket || socket.readyState !== WebSocket.OPEN) return;
            if (webcamVideo.readyState === webcamVideo.HAVE_ENOUGH_DATA) {
                webcamCtx.drawImage(webcamVideo, 0, 0, webcamCanvas.width, webcamCanvas.height);
                webcamCanvas.toBlob((blob) => {
                    if (blob && socket.readyState === WebSocket.OPEN) {
                        socket.send(blob);
                    }
                }, "image/jpeg", 0.5);
            }
        }

        window.onload = initViewport;
        document.getElementById("btn-back")?.addEventListener("click", () => window.close());
        document.getElementById("btn-restart")?.addEventListener("click", restartProject);
        document.getElementById("btn-stop")?.addEventListener("click", stopProjectElegant);
        document.getElementById("btn-clear-console")?.addEventListener("click", clearConsole);
        setupActivityTracking();
        window.onbeforeunload = () => {
            stopWebcamStream();
            stopHeartbeat();
            if (socket) socket.close();
        };

        // Setup Terminal Input event listener
        const terminalInputField = document.getElementById("terminal-input-field");
        if (terminalInputField) {
            terminalInputField.addEventListener("keydown", (event) => {
                if (event.key === "Enter") {
                    const text = terminalInputField.value;
                    if (socket && socket.readyState === WebSocket.OPEN) {
                        socket.send(JSON.stringify({
                            type: "terminal_input",
                            data: text
                        }));
                        appendConsole(`> ${text}\n`);
                        terminalInputField.value = "";
                    } else {
                        appendConsole("\n[系統] 錯誤: 無法傳送輸入，連線已中斷。\n");
                    }
                }
            });
        }
        
        // Focus input field when clicking console logs area
        const consoleBox = document.getElementById("console-logs");
        if (consoleBox) {
            consoleBox.addEventListener("click", () => {
                if (terminalInputField) terminalInputField.focus();
            });
        }