// =========== Custom Select Dropdowns ===========
    function ufSelectToggle(id) {
        const wrap     = document.getElementById(id + '-wrap') || document.getElementById(id + '-trigger')?.closest('.uf-select-wrap');
        const trigger  = document.getElementById(id + '-trigger');
        const dropdown = document.getElementById(id + '-dropdown');
        const arrow    = document.getElementById(id + '-arrow');
        if (!dropdown) return;

        const isOpen = !dropdown.classList.contains('hidden');

        // Close all open dropdowns first
        document.querySelectorAll('.uf-select-dropdown').forEach(d => {
            d.classList.add('hidden');
            d.classList.remove('uf-select-dropdown-up');
        });
        document.querySelectorAll('.uf-select-arrow').forEach(a => a.classList.remove('uf-select-arrow-open'));

        if (!isOpen) {
            // Detect direction: open upward only if there's not enough space below
            if (trigger) {
                const rect       = trigger.getBoundingClientRect();
                const spaceBelow = window.innerHeight - rect.bottom;
                const spaceAbove = rect.top;
                const dropH      = 240; // max-height of dropdown
                if (spaceBelow < dropH && spaceAbove > spaceBelow) {
                    dropdown.classList.add('uf-select-dropdown-up');
                }
            }
            dropdown.classList.remove('hidden');
            if (arrow) arrow.classList.add('uf-select-arrow-open');
        }
    }

    function ufSelectPick(id, value, label) {
        const hidden   = document.getElementById(id);
        const labelEl  = document.getElementById(id + '-label');
        const dropdown = document.getElementById(id + '-dropdown');
        const arrow    = document.getElementById(id + '-arrow');

        if (hidden)  hidden.value    = value;
        if (labelEl) {
            labelEl.textContent = label;
            labelEl.style.color = '#ffffff'; // selected = white, placeholder was grey
        }
        if (dropdown) dropdown.classList.add('hidden');
        if (arrow)    arrow.classList.remove('uf-select-arrow-open');

        // Mark active option
        if (dropdown) {
            dropdown.querySelectorAll('.uf-select-option').forEach(opt => {
                opt.classList.toggle('uf-select-option-active', opt.dataset.value === value);
            });
        }

        // Fire side-effects by id
        if (id === 'live-palette') applyPalette(value);
    }

    // Close on outside click
    document.addEventListener('click', function(e) {
        if (!e.target.closest('.uf-select-wrap')) {
            document.querySelectorAll('.uf-select-dropdown').forEach(d => d.classList.add('hidden'));
            document.querySelectorAll('.uf-select-arrow').forEach(a => a.classList.remove('uf-select-arrow-open'));
        }
    });

// =========== Rolling Counter ===========
        function animateValue(obj, start, end, duration) {
            let startTimestamp = null;
            const isPct = typeof end === 'string' && end.includes('%');
            const endNum = isPct ? parseFloat(end) : end;
            const startNum = parseFloat(start) || 0;

            const step = (timestamp) => {
                if (!startTimestamp) startTimestamp = timestamp;
                const progress = Math.min((timestamp - startTimestamp) / duration, 1);
                const ease = progress * (2 - progress);
                const current = ease * (endNum - startNum) + startNum;
                
                if (isPct) {
                    obj.innerText = current.toFixed(1) + '%';
                } else {
                    obj.innerText = Math.floor(current);
                }

                if (progress < 1) {
                    window.requestAnimationFrame(step);
                } else {
                    obj.innerText = end;
                }
            };
            window.requestAnimationFrame(step);
        }

// Close all open tooltips
function closeAllTips() {
    document.querySelectorAll('.info-tip').forEach(tip => {
        tip.style.display = 'none';
    });
}

function positionTip(tip, wrap) {
    const rect = wrap.getBoundingClientRect();
    const tipH = tip.offsetHeight || 60;
    if (rect.bottom + tipH + 10 > window.innerHeight) {
        tip.style.top = (rect.top - tipH - 6) + 'px';
    } else {
        tip.style.top = (rect.bottom + 6) + 'px';
    }
    tip.style.left = Math.min(rect.left, window.innerWidth - 260) + 'px';
}

// Desktop hover only — never fires on touch
document.addEventListener('mouseover', e => {
    if (window.matchMedia('(hover: none)').matches) return;
    const wrap = e.target.closest('.info-wrap');
    if (!wrap) return;
    const tip = wrap.querySelector('.info-tip');
    if (!tip) return;
    tip.style.display = 'block';
    positionTip(tip, wrap);
});

document.addEventListener('mouseout', e => {
    if (window.matchMedia('(hover: none)').matches) return;
    const wrap = e.target.closest('.info-wrap');
    if (!wrap) return;
    const tip = wrap.querySelector('.info-tip');
    if (tip) tip.style.display = 'none';
});

// Tap/click toggle — works on both desktop and mobile
document.addEventListener('click', e => {
    const btn = e.target.closest('.info-btn');
    if (!btn) {
        if (!e.target.closest('.info-tip') && !e.target.closest('.info-wrap')) {
            closeAllTips();
        }
        return;
    }
    e.stopPropagation();
    const wrap = btn.closest('.info-wrap');
    if (!wrap) return;
    const tip = wrap.querySelector('.info-tip');
    if (!tip) return;

    const isVisible = tip.style.display === 'block';
    closeAllTips();
    if (!isVisible) {
        tip.style.display = 'block';
        positionTip(tip, wrap);
    }
});

// ---- Tab switching — updates both sidebar + mobile bottom nav ----
function switchTab(tab) {
    console.log('[UrbanFlow] Switching to tab:', tab);

    const allTabs = ['about', 'overview', 'results', 'settings', 'help', 'feedback', 'profile'];

    allTabs.forEach(t => {
        const el = document.getElementById('tab-' + t);
        if (el) {
            el.classList.toggle('hidden', tab !== t);
            if (tab === t) console.log('[UrbanFlow] Tab visible:', t);
        }

        const nav = document.getElementById('nav-' + t);
        if (nav) {
            if (tab === t) {
                nav.classList.add('nav-item-active');
                nav.classList.remove('nav-item-inactive');
            } else {
                nav.classList.remove('nav-item-active');
                nav.classList.add('nav-item-inactive');
            }
        }

        const mobNav = document.getElementById('mob-nav-' + t);
        if (mobNav) mobNav.classList.toggle('active', tab === t);
    });

    // Refresh Profile UI every switch
    if (typeof populateProfileUI === 'function') populateProfileUI();
    if (tab === 'profile') populateProfileTab();

    // Stop glow notification when user views Results
    if (tab === 'results') {
        const mobResults = document.getElementById('mob-nav-results');
        if (mobResults) mobResults.classList.remove('notify-glow');
        const navResults = document.getElementById('nav-results');
        if (navResults) navResults.classList.remove('notify-glow');
    }

    // Store active tab
    sessionStorage.setItem('uf_active_tab', tab);
}

// Ensure global access
window.switchTab = switchTab;

        // =========== Toast System ===========
        function showToast(message, type) {
            type = type || 'info';
            const icons = { success: 'fa-check-circle', error: 'fa-circle-xmark', info: 'fa-circle-info' };
            const el = document.createElement('div');
            el.className = `toast toast-${type}`;
            el.innerHTML = `<i class="fa-solid ${icons[type] || icons.info}"></i> ${message}`;
            document.getElementById('toast-container').appendChild(el);
            setTimeout(() => { el.classList.add('toast-out'); setTimeout(() => el.remove(), 300); }, 3000);
        }

        // =========== Keyboard Shortcuts ===========
        const TAB_KEYS = { '1': 'about', '2': 'overview', '3': 'results', '4': 'settings', '5': 'help', '6': 'feedback', '7': 'profile' };
        function downloadArtifacts() {
            const vid = document.body.dataset.lastVideoId;
            if (vid) {
                const btn = document.getElementById('btn-download-bundle');
                if (btn) {
                    const originalHTML = btn.innerHTML;
                    btn.innerHTML = `<i class="fa-solid fa-spinner fa-spin mr-2"></i> Zipping...`;
                    btn.disabled = true;
                    setTimeout(() => {
                        btn.innerHTML = originalHTML;
                        btn.disabled = false;
                    }, 4000);
                }
                window.open(`bundle/${vid}`, '_blank');
                showToast('Preparing download bundle...', 'info');
            }
        }

        document.addEventListener('keydown', function(e) {
            if (e.target.tagName === 'INPUT' || e.target.tagName === 'TEXTAREA' || e.target.tagName === 'SELECT') return;
            if (TAB_KEYS[e.key]) { switchTab(TAB_KEYS[e.key]); return; }
            if (e.key === 'd' || e.key === 'D') {
                downloadArtifacts();
            }
        });

        // =========== Feedback ===========
        let _fbRating = 0;
        let _fbEmojis = {
            'fb-recommend': null,
            'fb-security': null,
            'fb-integration': null,
            'fb-ease': null
        };

        function setRating(n) {
            _fbRating = n;
            document.querySelectorAll('.fb-star').forEach(s => {
                s.classList.toggle('active', parseInt(s.dataset.v) <= n);
            });
        }

        function setEmoji(el, qId, val) {
            _fbEmojis[qId] = val;
            const container = document.getElementById(qId);
            if (container) {
                container.querySelectorAll('.fb-emoji-btn').forEach(btn => btn.classList.remove('active'));
            }
            el.classList.add('active');
        }

        async function submitFeedback() {
            const typeEl = document.getElementById('fb-type');
            const typeText = typeEl.selectedIndex >= 0 ? typeEl.options[typeEl.selectedIndex].text : "";
            
            const usecaseEl = document.getElementById('fb-usecase');
            const usecaseText = usecaseEl.selectedIndex >= 0 ? usecaseEl.options[usecaseEl.selectedIndex].text : "";
            
            const text = document.getElementById('fb-text').value.trim();
            
            const priorities = [];
            document.querySelectorAll('#fb-priorities .fb-chip.active').forEach(c => {
                priorities.push(c.innerText);
            });

            if (_fbRating === 0 && !text && !Object.values(_fbEmojis).some(v => v) && priorities.length === 0) {
                showToast("Please provide a star rating or some detailed feedback", "error");
                return;
            }

            const payload = {
                rating: _fbRating,
                emojis: _fbEmojis,
                type: typeText,
                usecase: usecaseText,
                priorities: priorities,
                details: text,
                timestamp: new Date().toISOString()
            };

            // Attach authenticated user email if available
            const session = (typeof getAuthSession === 'function') ? getAuthSession() : null;
            if (session && session.email) {
                payload.user_email = session.email;
            }
            const res = await fetch('api/feedback', {
                method: 'POST',
                headers: { 'Content-Type': 'application/json' },
                body: JSON.stringify(payload)
            });
            if (res.ok) {
                showToast('Thank you for your feedback!', 'success');
                document.getElementById('fb-text').value = '';

                // Reset custom uf-select dropdowns
                ['fb-usecase', 'fb-type'].forEach(function(id) {
                    var hidden = document.getElementById(id);
                    var label  = document.getElementById(id + '-label');
                    var dropdown = document.getElementById(id + '-dropdown');
                    if (hidden) hidden.value = '';
                    if (label) {
                        label.textContent = id === 'fb-usecase' ? 'Select your use case' : 'General Feedback';
                        label.style.color = '#666';
                    }
                    if (dropdown) {
                        dropdown.querySelectorAll('.uf-select-option').forEach(function(opt) {
                            opt.classList.remove('uf-select-option-active');
                        });
                    }
                });
                document.querySelectorAll('#fb-priorities .fb-chip').forEach(c => c.classList.remove('active'));
                
                // Reset Emojis
                Object.keys(_fbEmojis).forEach(k => {
                    _fbEmojis[k] = null;
                    const c = document.getElementById(k);
                    if (c) c.querySelectorAll('.fb-emoji-btn').forEach(b => b.classList.remove('active'));
                });

                _fbRating = 0;
                setRating(0);

                // Start Smooth Cooldown (60 seconds)
                const btn = document.getElementById('fb-submit-btn');
                const wrap = document.getElementById('fb-cooldown-wrap');
                const bar = document.getElementById('fb-cooldown-bar');
                
                btn.disabled = true;
                btn.style.opacity = '0.5';
                btn.style.cursor = 'not-allowed';
                btn.innerText = 'Feedback Received';
                wrap.classList.remove('hidden');
                
                const startTime = Date.now();
                const duration = 60000;
                
                function updateSmoothBar() {
                    const elapsed = Date.now() - startTime;
                    const remaining = Math.max(0, duration - elapsed);
                    bar.style.width = (remaining / duration * 100) + '%';
                    
                    if (remaining > 0) {
                        requestAnimationFrame(updateSmoothBar);
                    } else {
                        btn.disabled = false;
                        btn.style.opacity = '1';
                        btn.style.cursor = 'pointer';
                        btn.innerText = 'Transmit Feedback';
                        wrap.classList.add('hidden');
                        bar.style.width = '100%';
                    }
                }
                requestAnimationFrame(updateSmoothBar);
            } else {
                showToast('Failed to submit — please try again', 'error');
            }
        }

        // =========== PCU Calculation (client-side mirror) ===========
        const PCU_TABLE = {0:1,1:1,2:1,3:1,4:3,5:3,6:1.2,7:0.5,8:3,9:3,10:3,11:0.5,12:1,13:1};
        function calcPCU(classIn, classOut) {
            let total = 0;
            for (const [k, v] of Object.entries(classIn)) total += (PCU_TABLE[parseInt(k)] || 1) * v;
            for (const [k, v] of Object.entries(classOut)) total += (PCU_TABLE[parseInt(k)] || 1) * v;
            return Math.round(total * 10) / 10;
        }

        // =========== Insights Rendering ===========
        function renderInsights(d) {
            const panel = document.getElementById('insights-panel');
            if (panel) panel.classList.remove('hidden');

            // Congestion insights
            const ci = document.getElementById('congestion-insights');
            const pcu = d.pcu || {};
            if (ci) {
                ci.innerHTML = [
                    infoRow('Total PCU', pcu.total_pcu || 0, 'Passenger Car Units (IRC:106-1990). Normalizes mixed traffic.'),
                    infoRow('PCU In / Out', `${pcu.pcu_in || 0} / ${pcu.pcu_out || 0}`, 'Directional PCU split.'),
                ].join('');
            }

            // PCU card in Stats
            const pcuCard = document.getElementById('pcu-stats-card');
            if (pcuCard) {
                const totalPcu = pcu.total_pcu || 0;

                // Capacity label based on total PCU volume
                let capLabel, capColor, capNote;
                if (totalPcu < 50) {
                    capLabel = 'Very Low Volume'; capColor = '#22c55e';
                    capNote  = 'Minimal traffic on this segment';
                } else if (totalPcu < 200) {
                    capLabel = 'Low Volume';      capColor = '#22c55e';
                    capNote  = 'Below typical urban arterial demand';
                } else if (totalPcu < 500) {
                    capLabel = 'Moderate Volume'; capColor = '#c89a6c';
                    capNote  = 'Typical mixed urban traffic';
                } else if (totalPcu < 900) {
                    capLabel = 'High Volume';     capColor = '#f97316';
                    capNote  = 'Approaching single-lane capacity (IRC:106)';
                } else {
                    capLabel = 'Near/Over Capacity'; capColor = '#ef4444';
                    capNote  = 'Exceeds IRC single-lane urban reference (1000 PCU)';
                }

                // Dominant class from per_class breakdown
                let domClass = '—', domFactor = '—';
                if (pcu.per_class && Object.keys(pcu.per_class).length > 0) {
                    const sorted = Object.entries(pcu.per_class)
                        .sort((a, b) => b[1].pcu - a[1].pcu);
                    domClass  = sorted[0][0];
                    domFactor = sorted[0][1].factor;
                }

                pcuCard.innerHTML = `
                    <div class="w-full space-y-3">
                        <div>
                            <span class="text-base font-black uppercase tracking-wide"
                                  style="color:${capColor}">${capLabel}</span>
                            <p class="text-[10px] mt-0.5" style="color:#a89f97">${capNote}</p>
                            <p class="text-[10px] mt-1" style="color:#666">
                                Dominant: ${domClass} · PCU factor ${domFactor}
                            </p>
                        </div>
                        <div class="flex justify-between items-center pt-1">
                            <span class="text-xs font-medium text-slate-500">Total PCU</span>
                            <span class="text-2xl font-black" style="color:#8b5e3c">${totalPcu}</span>
                        </div>
                        <div class="flex gap-3">
                            <div class="flex-1 bg-green-950 rounded-lg p-2.5 text-center border border-green-900">
                                <div class="text-lg font-bold text-green-400">${pcu.pcu_in || 0}</div>
                                <div class="text-[9px] font-bold text-green-600 uppercase">PCU In</div>
                            </div>
                            <div class="flex-1 bg-red-950 rounded-lg p-2.5 text-center border border-red-900">
                                <div class="text-lg font-bold text-red-400">${pcu.pcu_out || 0}</div>
                                <div class="text-[9px] font-bold text-red-600 uppercase">PCU Out</div>
                            </div>
                        </div>
                    </div>`;
            }
        }

        // =========== Run Details helpers ===========
        function detailRow(label, value, extra) {
            extra = extra || '';
            return `<div class="flex justify-between items-center border-b border-slate-800 pb-2">
                <span class="text-xs font-medium text-slate-500 mono-font">${label}</span>
                <span class="text-sm font-bold text-white">${value}${extra}</span>
            </div>`;
        }

        function infoRow(label, value, tip, extra) {
            extra = extra || '';
            return `<div class="flex justify-between items-center border-b border-slate-800 pb-2 relative">
                <span class="text-xs font-medium text-slate-500 mono-font flex items-center">${label}
                    <span class="info-wrap"><span class="info-btn"><i class="fa-solid fa-info"></i></span>
                    <span class="info-tip">${tip}</span></span>
                </span>
                <span class="text-sm font-bold text-white">${value}${extra}</span>
            </div>`;
        }

        function boolBadge(val) {
            if (val) return `<span class="inline-flex items-center bg-green-50 text-green-700 text-[10px] font-bold px-2 py-0.5 rounded border border-green-200"><i class="fa-solid fa-check mr-1"></i>TRUE</span>`;
            return `<span class="text-[10px] font-bold text-slate-300">FALSE</span>`;
        }

        function populateRunDetails(c) {
            const res = c.resolution || [0, 0];

            document.getElementById('panel-video').innerHTML =
                detailRow('video_fps', (c.video_fps || 0).toFixed(2)) +
                detailRow('frames', c.frames) +
                detailRow('duration', (c.duration || 0).toFixed(2) + ' sec') +
                detailRow('resolution', res[0] + ' <span class="text-slate-400 text-xs">x</span> ' + res[1]) +
                detailRow('pixels', (c.pixels || 0).toLocaleString());

            const cpuPct = Math.min(100, Math.round((c.cpu_score / 10) * 100));
            document.getElementById('panel-perf').innerHTML =
                `<div class="flex justify-between items-center border-b border-slate-800 pb-2 relative">
                    <span class="text-xs font-medium text-slate-500 mono-font flex items-center">cpu_score
                        <span class="info-wrap"><span class="info-btn"><i class="fa-solid fa-info"></i></span>
                        <span class="info-tip">Available CPU core count used for throughput estimation.</span></span>
                    </span>
                    <div class="flex items-center">
                        <span class="text-sm font-bold text-white mr-2">${c.cpu_score}</span>
                        <div class="w-16 h-1.5 bg-slate-800 rounded-full overflow-hidden">
                            <div class="h-full bg-emerald-500" style="width:${cpuPct}%"></div>
                        </div>
                    </div>
                </div>` +
                infoRow('model_fps_est', c.model_fps_est, 'Estimated model inference throughput based on CPU benchmark.', ' <span class="text-xs text-slate-400 font-normal">fps</span>') +
                infoRow('effective_fps', c.effective_fps_est, 'Adjusted throughput accounting for frame stride.', ' <span class="text-xs text-slate-400 font-normal">fps</span>');

            document.getElementById('panel-model').innerHTML =
                `<div class="flex justify-between items-center border-b border-slate-800 pb-2">
                    <span class="text-xs font-medium text-slate-500 mono-font">model</span>
                    <a href="https://huggingface.co/Perception365/VehicleNet-Y26s" target="_blank" class="text-sm font-bold text-white mono-font hover:text-slate-300 transition underline underline-offset-4 decoration-slate-700">Perception365/VehicleNet-Y26s</a>
                </div>` +
                detailRow('task', 'detect') +
                detailRow('format', 'OpenVINO') +
                detailRow('tracker', 'ByteTrack');

            populateInferPanel(c);
        }

        function populateInferPanel(c) {
            document.getElementById('panel-infer').innerHTML =
                infoRow('imgsz', c.imgsz, 'Input image resolution for model inference.') +
                infoRow('vid_stride', c.detect_stride, 'Frames skipped between consecutive detections relative to the spatial boundary.') +
                infoRow('conf', (c.conf || 0.12).toFixed(2), 'Minimum confidence threshold for valid detections.') +
                infoRow('iou', (c.iou || 0.60).toFixed(2), 'Intersection-over-Union threshold for non-max suppression.') +
                infoRow('stream', 'TRUE', 'Frame-by-frame processing for constant memory usage.') +
                infoRow('verbose', 'FALSE', 'Console logging suppressed during inference.');
        }

        // =========== Palettes ===========
        const PALETTES = {
            default: { congestion: '#f97316', congestionBg: 'rgba(249,115,22,0.08)', dominance: '#14b8a6', flow: '#3b82f6', doughIn: '#3b82f6', doughOut: '#f97316' },
            vibrant: { congestion: '#ff2d55', congestionBg: 'rgba(255,45,85,0.08)', dominance: '#a855f7', flow: '#22d3ee', doughIn: '#22d3ee', doughOut: '#ff2d55' },
            corporate: { congestion: '#1e40af', congestionBg: 'rgba(30,64,175,0.08)', dominance: '#0d9488', flow: '#475569', doughIn: '#475569', doughOut: '#1e40af' },
            neon: { congestion: '#f0abfc', congestionBg: 'rgba(240,171,252,0.08)', dominance: '#22d3ee', flow: '#a855f7', doughIn: '#a855f7', doughOut: '#f0abfc' },
            earth: { congestion: '#84cc16', congestionBg: 'rgba(132,204,22,0.08)', dominance: '#22c55e', flow: '#f59e0b', doughIn: '#f59e0b', doughOut: '#84cc16' },
            ocean: { congestion: '#06b6d4', congestionBg: 'rgba(6,182,212,0.08)', dominance: '#3b82f6', flow: '#14b8a6', doughIn: '#14b8a6', doughOut: '#06b6d4' },
            sunset: { congestion: '#f59e0b', congestionBg: 'rgba(245,158,11,0.08)', dominance: '#f43f5e', flow: '#fb923c', doughIn: '#fb923c', doughOut: '#f59e0b' },
            midnight: { congestion: '#38bdf8', congestionBg: 'rgba(56,189,248,0.08)', dominance: '#1d4ed8', flow: '#f8fafc', doughIn: '#f8fafc', doughOut: '#38bdf8' },
            gold: { congestion: '#fbbf24', congestionBg: 'rgba(251,191,36,0.08)', dominance: '#a8a29e', flow: '#f5f5f4', doughIn: '#f5f5f4', doughOut: '#fbbf24' }
        };

        // =========== Global State (Initialized in initApp) ===========
        let currentPalette = 'default';
        let activePalette = PALETTES.default;
        let MODEL_CLASSES = {};
        let BUSINESS_MAP = {};
        let congChart, doughChart, domChart, flowChart;

        async function initApp() {
            // Read settings from sessionStorage
            const rawRun = sessionStorage.getItem('funky_run');
            const runSettings = rawRun ? (JSON.parse(rawRun).settings || {}) : {};
            currentPalette = runSettings.palette || 'default';
            activePalette = PALETTES[currentPalette];

            // =========== Charts ===========
            Chart.defaults.font.family = "'Montserrat', sans-serif";
            Chart.defaults.color = '#888888';
            Chart.defaults.borderColor = '#222222';
            Chart.defaults.plugins.tooltip.backgroundColor = '#0a0a0a';
            Chart.defaults.plugins.tooltip.titleColor = '#ffffff';
            Chart.defaults.plugins.tooltip.bodyColor = '#aaaaaa';
            Chart.defaults.plugins.tooltip.borderColor = '#222222';
            Chart.defaults.plugins.tooltip.borderWidth = 1;

            congChart = new Chart(document.getElementById('congestionChart').getContext('2d'), {
                type: 'line',
                data: {
                    labels: [], datasets: [{
                        data: [],
                        borderColor: activePalette.congestion,
                        backgroundColor: activePalette.congestionBg,
                        fill: true,
                        tension: 0.2,
                        borderWidth: 1.5,
                        pointRadius: 0
                    }]
                },
                options: {
                    responsive: true, maintainAspectRatio: false,
                    plugins: { legend: { display: false } },
                    scales: {
                        x: { grid: { display: false }, ticks: { maxTicksLimit: 10, font: { size: 10 }, color: '#666666' }, title: { display: true, text: 'Frame Index', font: { size: 10, weight: '700' }, color: '#888888' } },
                        y: { grid: { color: '#1a1a1a' }, beginAtZero: true, ticks: { font: { size: 10 }, color: '#666666' }, title: { display: true, text: 'Active Vehicles', font: { size: 10, weight: '700' }, color: '#888888' } }
                    },
                    animation: { duration: 0 }
                },
                plugins: []
            });

            doughChart = new Chart(document.getElementById('doughnutChart').getContext('2d'), {
                type: 'doughnut',
                data: {
                    labels: ['Incoming', 'Outgoing'], datasets: [{
                        data: [0, 0],
                        backgroundColor: [activePalette.doughIn, activePalette.doughOut],
                        borderColor: '#0a0a0a',
                        borderWidth: 3,
                        hoverOffset: 6
                    }]
                },
                options: {
                    responsive: true, maintainAspectRatio: false,
                    cutout: '68%',
                    plugins: {
                        legend: { display: true, position: 'bottom', labels: { padding: 12, usePointStyle: true, pointStyle: 'circle', font: { size: 10, weight: '600' } } }
                    },
                    animation: { duration: 0 }
                },
                plugins: []
            });

            domChart = new Chart(document.getElementById('dominanceChart').getContext('2d'), {
                type: 'bar',
                data: { labels: [], datasets: [{ data: [], backgroundColor: activePalette.dominance, borderRadius: 2 }] },
                options: {
                    responsive: true, maintainAspectRatio: false,
                    layout: { padding: { bottom: 12 } },
                    plugins: { legend: { display: false } },
                    scales: {
                        x: { grid: { display: false }, ticks: { font: { size: 9, weight: '500' }, color: '#666666', maxRotation: 45, minRotation: 30, autoSkip: false } },
                        y: { grid: { color: '#1a1a1a' }, beginAtZero: true, ticks: { font: { size: 10 }, color: '#666666' }, title: { display: true, text: 'Total Vehicle Count', font: { size: 10, weight: '700' }, color: '#888888' } }
                    },
                    animation: { duration: 0 }
                },
                plugins: []
            });

            flowChart = new Chart(document.getElementById('flowChart').getContext('2d'), {
                type: 'bar',
                data: { labels: [], datasets: [{ data: [], backgroundColor: activePalette.flow, borderColor: '#0a0a0a', borderWidth: 1.5, barPercentage: 1.0, categoryPercentage: 1.0 }] },
                options: {
                    responsive: true, maintainAspectRatio: false,
                    plugins: { legend: { display: false } },
                    scales: {
                        x: { grid: { display: false }, ticks: { maxTicksLimit: 10, font: { size: 10 }, color: '#666666' }, title: { display: true, text: 'Time (seconds)', font: { size: 10, weight: '700' }, color: '#888888' } },
                        y: { grid: { color: '#1a1a1a' }, beginAtZero: true, ticks: { font: { size: 10 }, color: '#666666' }, title: { display: true, text: 'Vehicles Crossed', font: { size: 10, weight: '700' }, color: '#888888' } }
                    },
                    animation: { duration: 0 }
                },
                plugins: []
            });

            // Original init() logic
            const raw = sessionStorage.getItem('funky_run');
            if (!raw) {
                if (typeof showOnboardingPhase === 'function') {
                    showOnboardingPhase();
                } else {
                    window.location.replace('/');
                }
                return;
            }

            _params = JSON.parse(raw);

            const cRes = await fetch('constants');
            const cData = await cRes.json();
            MODEL_CLASSES = cData.classes;
            BUSINESS_MAP = cData.business_map;

            populateAndInit(_params);
            sessionStorage.removeItem('funky_run');
            
            // Sync current active tab from session if set
            const activeTab = sessionStorage.getItem('uf_active_tab') || 'settings';
            switchTab(activeTab);

            // Populate auth profile UI
            populateProfileUI();
        }

        // =========== Update functions ===========
        function sumValues(obj) { return Object.values(obj).reduce((a, b) => a + b, 0); }

        // =========== Live Palette Switching ===========
        function applyPalette(key) {
            activePalette = PALETTES[key] || PALETTES.default;
            currentPalette = key;

            // Congestion
            congChart.data.datasets[0].borderColor = activePalette.congestion;
            congChart.data.datasets[0].backgroundColor = activePalette.congestionBg;
            congChart.update();

            // Doughnut
            doughChart.data.datasets[0].backgroundColor = [activePalette.doughIn, activePalette.doughOut];
            doughChart.update();

            // Dominance
            domChart.data.datasets[0].backgroundColor = activePalette.dominance;
            domChart.update();

            // Flow
            flowChart.data.datasets[0].backgroundColor = activePalette.flow;
            flowChart.update();

            // Update palette dropdown in progress bar
            const barSel = document.getElementById('live-palette-select');
            if (barSel) barSel.value = key;
        }

        function renderPalettePreview(key) {
            const pal = PALETTES[key];
            const colors = [
                { color: pal.congestion, label: 'Congestion' },
                { color: pal.dominance, label: 'Dominance' },
                { color: pal.flow, label: 'Flow' },
                { color: pal.doughIn, label: 'Incoming' },
                { color: pal.doughOut, label: 'Outgoing' }
            ];
            const el = document.getElementById('live-palette-preview');
            if (el) {
                el.innerHTML = colors.map(c =>
                    `<div class="flex-1 rounded-lg overflow-hidden border border-neutral-800">
                        <div class="h-6" style="background:${c.color}"></div>
                        <div class="text-[8px] font-bold text-neutral-500 text-center py-1 bg-neutral-900">${c.label}</div>
                    </div>`
                ).join('');
            }
        }

        function populateSettingsTab(config, settings) {
            // Populate stepper values from config
            document.getElementById('sv-imgsz').textContent = config.imgsz || 640;
            document.getElementById('sv-conf').textContent = (config.conf || 0.12).toFixed(2);
            document.getElementById('sv-iou').textContent = (config.iou || 0.60).toFixed(2);
            document.getElementById('sv-stride').textContent = config.detect_stride || 2;

            // Populate export settings
            const selReport = document.getElementById('sv-report');
            if (selReport) selReport.value = settings.reportFormat || 'png';
            const togAnnot = document.getElementById('sv-annotated');
            if (togAnnot && settings.annotatedVideo) togAnnot.classList.add('active');

            // Set live palette dropdown
            const sel = document.getElementById('live-palette-select');
            if (sel) sel.value = currentPalette;
            renderPalettePreview(currentPalette);
        }

        // =========== Settings Stepper Logic ===========
        const PARAM_LIMITS = {
            imgsz: { min: 640, max: 1280 },
            conf: { min: 0.10, max: 0.95 },
            iou: { min: 0.50, max: 0.95 },
            stride: { min: 1, max: 10 },
            smoothing: { min: 0.05, max: 0.95 }
        };

        function stepParam(param, delta) {
            const el = document.getElementById('sv-' + param);
            if (!el) return;
            const limits = PARAM_LIMITS[param];
            let val = parseFloat(el.textContent);
            val = Math.round((val + delta) * 100) / 100;
            val = Math.max(limits.min, Math.min(limits.max, val));
            el.textContent = (param === 'conf' || param === 'iou' || param === 'smoothing') ? val.toFixed(2) : val;
        }

        function lockSettings() {
            document.querySelectorAll('#settings-params .s-row').forEach(row => {
                const p = row.dataset.param;
                if (p && p !== 'palette') {
                    row.classList.add('disabled');
                }
            });
            const reportRow = document.getElementById('sv-report');
            if (reportRow) reportRow.closest('.s-row').classList.add('disabled');
            // Also directly hide the wrap and close dropdown — CSS may be cached
            const svWrap = document.getElementById('sv-report-wrap');
            if (svWrap) {
                svWrap.style.pointerEvents = 'none';
                svWrap.style.opacity = '0.4';
                const dd = document.getElementById('sv-report-dropdown');
                if (dd) dd.classList.add('hidden');
            }
            const annotatedRow = document.getElementById('sv-annotated');
            if (annotatedRow) annotatedRow.closest('.s-row').classList.add('disabled');
            const wrap = document.getElementById('settings-start-wrap');
            if (wrap) wrap.style.display = 'none';
        }

        function startNewAnalysis() {
            sessionStorage.clear();
            _params = null;
            // SPA Router
            if (typeof showOnboardingPhase === 'function') {
                showOnboardingPhase();
            } else {
                window.location.replace('/');
            }
        }
        function updateBreakdown(classIn, classOut) {
            const container = document.getElementById('class-breakdown');
            const totalAll = sumValues(classIn) + sumValues(classOut);
            container.innerHTML = '';

            // Update Doughnut border logic (remove gap if unidirectional)
            const sumIn = sumValues(classIn);
            const sumOut = sumValues(classOut);
            doughChart.data.datasets[0].borderWidth = (sumIn === 0 || sumOut === 0) ? 0 : 3;
            doughChart.data.datasets[0].data = [sumIn, sumOut];
            doughChart.update();
            document.getElementById('cnt-total').innerText = totalAll;

            Object.keys(MODEL_CLASSES).map(Number).sort((a, b) => a - b).forEach(id => {
                const inC = classIn[String(id)] || 0;
                const outC = classOut[String(id)] || 0;
                const total = inC + outC;
                const pct = totalAll > 0 ? ((total / totalAll) * 100).toFixed(1) : '0.0';

                const row = document.createElement('div');
                row.className = 'flex items-center justify-between text-xs py-2 border-b border-slate-800';
                row.innerHTML = `
                    <div class="w-[30%] font-bold text-white truncate" title="${MODEL_CLASSES[id]}">${MODEL_CLASSES[id]}</div>
                    <div class="w-[20%] text-slate-500 text-[11px]">${total} total</div>
                    <div class="w-[15%] text-slate-500 text-[11px]"><i class="fa-solid fa-arrow-down text-[9px] mr-1"></i>${inC}</div>
                    <div class="w-[15%] text-slate-500 text-[11px]"><i class="fa-solid fa-arrow-up text-[9px] mr-1"></i>${outC}</div>
                    <div class="w-[20%] text-right font-bold text-white">${pct}%</div>
                `;
                container.appendChild(row);
            });
        }

        function updateDominance(classIn, classOut) {
            const labels = [], values = [];
            for (const [group, ids] of Object.entries(BUSINESS_MAP)) {
                let total = 0;
                ids.forEach(id => { total += (classIn[String(id)] || 0) + (classOut[String(id)] || 0); });
                labels.push(group);
                values.push(total);
            }
            domChart.data.labels = labels;
            domChart.data.datasets[0].data = values;
            domChart.update();
        }

        function buildFlowHistogram(flowTimes, videoDuration) {
            const binCount = Math.max(1, Math.ceil(videoDuration));
            const bins = new Array(binCount).fill(0);
            const labels = [];
            for (let i = 0; i < binCount; i++) labels.push(i);
            flowTimes.forEach(t => { bins[Math.min(Math.floor(t), binCount - 1)]++; });
            flowChart.data.labels = labels;
            flowChart.data.datasets[0].data = bins;
            flowChart.update();
        }

        let _alpha = 0.25;

        function updateCongestion(congestion, stride) {
            let data = congestion;
            // Apply EMA smoothing if alpha is less than 1 (1 = no smoothing)
            if (_alpha < 0.99) {
                data = [];
                let s = congestion[0] || 0;
                for (let v of congestion) {
                    s = _alpha * v + (1 - _alpha) * s;
                    data.push(s);
                }
            }

            const len = data.length;
            if (len <= 200) {
                congChart.data.labels = data.map((_, i) => i * stride);
                congChart.data.datasets[0].data = data;
            } else {
                // Dynamic sampling to keep chart performance high
                const step = Math.ceil(len / 200);
                const sampled = [], labels = [];
                for (let i = 0; i < len; i += step) {
                    labels.push(i * stride);
                    sampled.push(data[i]);
                }
                congChart.data.labels = labels;
                congChart.data.datasets[0].data = sampled;
            }
            congChart.update();
        }

        // =========== Main ===========
        let _params = null;


        function populateAndInit(params) {
            populateRunDetails(params.config);
            populateSettingsTab(params.config, params.settings || {});
        }

        function startProcessingFromSettings() {
            if (!_params) return;

            // Read current stepper/control values
            const imgsz = parseInt(document.getElementById('sv-imgsz').textContent);
            const conf = parseFloat(document.getElementById('sv-conf').textContent);
            const iou = parseFloat(document.getElementById('sv-iou').textContent);
            const stride = parseInt(document.getElementById('sv-stride').textContent);
            const reportFmt = document.getElementById('sv-report').value;
            const annotated = document.getElementById('sv-annotated').classList.contains('active');

            // Annotation Options
            const annotated_options = {
                bbox: true, // Always true if export is enabled
                spatial: document.getElementById('chip-spatial').classList.contains('active'),
                class_name: document.getElementById('chip-class_name').classList.contains('active'),
                class_id: document.getElementById('chip-class_id').classList.contains('active'),
                track_id: document.getElementById('chip-track_id').classList.contains('active')
            };

            const exportJson = document.getElementById('sv-export-json').classList.contains('active');
            const exportCsv = document.getElementById('sv-export-csv').classList.contains('active');

            // Apply to config
            _params.config.imgsz = imgsz;
            _params.config.conf = conf;
            _params.config.iou = iou;
            _params.config.detect_stride = stride;

            // Reflect final resolved params in Run tab
            populateInferPanel(_params.config);

            // Lock settings
            lockSettings();

            // Freeze annotation chips during processing
            const chipSelector = document.getElementById('chip-selector');
            if (chipSelector) {
                chipSelector.style.pointerEvents = 'none';
                chipSelector.style.opacity = '0.5';
            }

            // Switch to overview
            switchTab('overview');
            document.getElementById('proc-label').innerText = 'Connecting...';

            // Analytics Funnel
            if (typeof trackFunnel === 'function') {
                trackFunnel('PROCESS_STARTED');
            }

            // Reset Run Tab Results to Awaiting

            document.getElementById('run-results-content').innerHTML = `
                <div class="flex flex-col items-center justify-center p-8 bg-black/40 border border-slate-800 rounded-2xl col-span-3 text-slate-500">
                    <i class="fa-solid fa-spinner fa-spin text-2xl mb-3 text-white"></i>
                    <span class="text-xs font-semibold">Executing inference pipeline... results pending</span>
                </div>`;

            // Update Results tab pending message
            const repIcon = document.getElementById('reports-pending-icon');
            if (repIcon) {
                repIcon.className = 'fa-solid fa-satellite-dish animate-pulse text-5xl mb-2';
                repIcon.style.color = '#c89a6c';
            }
            const repText = document.getElementById('reports-pending-text');
            if (repText) repText.innerText = 'Transmission in progress...';


            // Start WebSocket
            const videoDuration = _params.config.duration || 10;

            const proto = location.protocol === 'https:' ? 'wss' : 'ws';
            // Get the directory path (e.g., /app/ or /) rather than the full filename
            const dirPath = location.pathname.substring(0, location.pathname.lastIndexOf('/') + 1);
            const ws = new WebSocket(`${proto}://${location.host}${dirPath}ws/run`);

            ws.onopen = () => {
                ws.send(JSON.stringify({
                    video_id: _params.video_id,
                    line: _params.line,
                    config: _params.config,
                    annotated_video: annotated,
                    annotated_options: annotated_options,
                    export_json: exportJson,
                    export_csv: exportCsv,
                    report_format: reportFmt
                }));
            };

            ws.onerror = e => {
                console.error('WS Error:', e);
                document.getElementById('proc-label').innerText = 'Connection Error';
                showToast('Connection error — server may be busy', 'error');
            };

            let processingDone = false;
            let firstMessageReceived = false;

            ws.onclose = () => {
                console.log('WS Closed');
                if (!processingDone) {
                    // Closed before done=True received — show error state
                    document.getElementById('proc-label').innerText = 'Disconnected';
                    document.getElementById('run-results-content').innerHTML = `
                        <div class="flex flex-col items-center justify-center p-8 border-2 border-dashed border-red-900/40 rounded-2xl col-span-3 text-slate-400">
                            <i class="fa-solid fa-triangle-exclamation text-2xl mb-3 text-red-400"></i>
                            <span class="text-xs font-semibold mb-1">Processing connection was lost.</span>
                            <span class="text-[10px] text-slate-500 mb-4">The server may have timed out or restarted. Please try again.</span>
                            <button onclick="startNewAnalysis()" class="text-[10px] font-bold uppercase tracking-widest px-4 py-2 rounded-full" style="background:#111;border:1px solid #2a2a2a;color:#c89a6c">
                                <i class="fa-solid fa-house mr-1"></i> Home
                            </button>
                        </div>`;
                }
            };

            let lastUIUpdate = 0;
            let liveCongestion = [];
            let liveFlowTimes = [];

            ws.onmessage = e => {
                const d = JSON.parse(e.data);

                if (!firstMessageReceived) {
                    firstMessageReceived = true;
                    document.getElementById('proc-label').innerText = 'Processing';
                }

                // Hide empty state on first data
                const emptyState = document.getElementById('stats-empty-state');
                if (emptyState) emptyState.style.display = 'none';
                if (d.error) {
                    processingDone = true;
                    document.getElementById('proc-label').innerText = 'Engine Error';
                    console.error('[UrbanFlow] Engine error:', d.detail || d.error);
                    document.getElementById('run-results-content').innerHTML = `
                        <div class="flex flex-col items-center justify-center p-8 border-2 border-dashed border-red-900/40 rounded-2xl col-span-3 text-slate-400">
                            <i class="fa-solid fa-triangle-exclamation text-2xl mb-3 text-red-400"></i>
                            <span class="text-xs font-semibold mb-1">Inference pipeline failed.</span>
                            <span class="text-[10px] text-slate-500 mb-4 text-center max-w-xs">${d.error}</span>
                            <button onclick="startNewAnalysis()" class="text-[10px] font-bold uppercase tracking-widest px-4 py-2 rounded-full" style="background:#111;border:1px solid #2a2a2a;color:#c89a6c">
                                <i class="fa-solid fa-house mr-1"></i> Home
                            </button>
                        </div>`;
                    return;
                }

                if (d.done) {
                    processingDone = true;
                    
                    // Stats Tracking (Scoped by email)
                    const session = (typeof getAuthSession === 'function') ? getAuthSession() : null;
                    const emailKey = session ? `_${session.email}` : '';
                    
                    let currentRuns = parseInt(localStorage.getItem(`uf_total_runs${emailKey}`) || '0');
                    localStorage.setItem(`uf_total_runs${emailKey}`, currentRuns + 1);
                    localStorage.setItem(`uf_last_active${emailKey}`, new Date().toLocaleString());

                    document.getElementById('proc-label').innerText = 'Complete';
                    document.getElementById('proc-bar').style.width = '100%';
                    document.getElementById('proc-pct').innerText = '100%';

                    // Force frame counter to n/n
                    const framesEl = document.getElementById('proc-frames');
                    if (framesEl) {
                        const parts = framesEl.innerText.split('/');
                        if (parts.length === 2) {
                            const total = parts[1].trim().replace(' Frames', '');
                            framesEl.innerText = `${total} / ${total} Frames`;
                        }
                    }


                    // GLOW NOTIFICATION: Let the user know artifacts are ready
                    const resultsMob = document.getElementById('mob-nav-results');
                    if (resultsMob) {
                        resultsMob.classList.add('notify-glow');
                    }

                    // Show results content immediately (telemetry first, reports load async)
                    const rPendingMsg = document.getElementById('reports-pending-message');
                    if (rPendingMsg) rPendingMsg.classList.add('hidden');
                    const rContentWrap = document.getElementById('results-content-wrap');
                    if (rContentWrap) rContentWrap.classList.remove('hidden');

                    document.getElementById('run-results-content').innerHTML =
                        detailRow('Inference Time', (d.processing_time || 0).toFixed(2) + ' sec') +
                        infoRow('Throughput (FPS)', (d.actual_fps || 0).toFixed(2), 'Measured frame throughput during processing.', ' <span class="text-xs text-slate-400 font-normal">fps</span>') +
                        infoRow('Real-time Ratio', (d.speed_vs_realtime || 0).toFixed(2) + 'x', 'Processing speed relative to video playback rate.');

                    if (d.video_id) {
                        loadReports(d.video_id).then(data => {
                            if (!data) return;

                            // Auto-Download Logic (Respects live toggle state)
                            if (document.getElementById('sv-auto-download').classList.contains('active')) {
                                // Download the full bundle ZIP via direct navigation
                                setTimeout(() => {
                                    console.log('[UrbanFlow] Fetching ZIP bundle for:', d.video_id);
                                    window.open(`bundle/${d.video_id}`, '_blank');
                                }, 1000); 
                            }
                        });
                    }

                    // Disable Auto-Download toggle after completion
                    const adToggle = document.getElementById('sv-auto-download');
                    if (adToggle) {
                        adToggle.closest('.s-row').classList.add('disabled');
                    }
                    const jsonToggle = document.getElementById('sv-export-json');
                    if (jsonToggle) {
                        jsonToggle.closest('.s-row').classList.add('disabled');
                    }

                    // NOTIFY USER: Glow the results icon in mobile nav
                    const resultsNav = document.getElementById('mob-nav-results');
                    if (resultsNav) {
                        resultsNav.classList.add('notify-glow');
                    }
                    const csvToggle = document.getElementById('sv-export-csv');
                    if (csvToggle) {
                        csvToggle.closest('.s-row').classList.add('disabled');
                    }

                    // Show New Analysis button in Settings
                    const newWrap = document.getElementById('new-analysis-wrap');
                    if (newWrap) newWrap.classList.remove('hidden');

                    // Toast + Insights
                    showToast('Processing complete — artifacts ready', 'success');
                    renderInsights(d);
                    showRetryBubble();

                    // Store video_id for keyboard shortcut download
                    document.body.setAttribute('data-last-video-id', d.video_id);

                    return;
                }

                let pct = ((d.frame_index / d.total_iters) * 100).toFixed(1);
                if (d.frame_index >= d.total_iters - 1) pct = '100.0';
                document.getElementById('proc-bar').style.width = pct + '%';
                document.getElementById('proc-frames').innerText = `${d.frame_index} / ${d.total_iters} Frames`;
                
                const procPctEl = document.getElementById('proc-pct');
                const currPct = parseFloat(procPctEl.innerText) || 0;
                animateValue(procPctEl, currPct, pct + '%', 300);

                const totalIn = sumValues(d.class_in);
                const totalOut = sumValues(d.class_out);
                
                const cntTotalEl = document.getElementById('cnt-total');
                const currTotal = parseInt(cntTotalEl.innerText) || 0;
                animateValue(cntTotalEl, currTotal, totalIn + totalOut, 300);

                // Update PCU display
                const pcuVal = calcPCU(d.class_in, d.class_out);
                const pcuEl = document.getElementById('cnt-pcu');
                if (pcuEl) pcuEl.innerText = pcuVal;

                // Update doughnut
                doughChart.data.datasets[0].data = [totalIn, totalOut];
                doughChart.update();

                // Live history management (Backend sends incremental updates now)
                if (d.congestion_last !== undefined) {
                    liveCongestion.push(d.congestion_last);
                }
                if (d.flow_count !== undefined) {
                    // Approximate timestamps for new crossings based on current frame
                    const videoFps = _params.config.video_fps || 30;
                    while (liveFlowTimes.length < d.flow_count) {
                        liveFlowTimes.push(d.frame_index * stride / videoFps);
                    }
                }

                const now = performance.now();
                if (now - lastUIUpdate < 300) return;
                lastUIUpdate = now;

                updateCongestion(liveCongestion, stride);
                updateBreakdown(d.class_in, d.class_out);
                updateDominance(d.class_in, d.class_out);
                buildFlowHistogram(liveFlowTimes, videoDuration);
            };
        }

        const REPORT_LABELS = {
            'direction_pie.png': { title: 'Directional Split', desc: 'Incoming vs outgoing vehicle ratio' },
            'direction_pie.pdf': { title: 'Directional Split', desc: 'Incoming vs outgoing vehicle ratio' },
            'flow_over_time.png': { title: 'Traffic Flow', desc: 'Vehicles crossing the line over time' },
            'flow_over_time.pdf': { title: 'Traffic Flow', desc: 'Vehicles crossing the line over time' },
            'congestion_index.png': { title: 'Congestion Index', desc: 'Active vehicles per frame with smoothing' },
            'congestion_index.pdf': { title: 'Congestion Index', desc: 'Active vehicles per frame with smoothing' },
            'class_dominance.png': { title: 'Class Dominance', desc: 'Vehicle count by classification type' },
            'class_dominance.pdf': { title: 'Class Dominance', desc: 'Vehicle count by classification type' },
            'confidence_dist.png': { title: 'Confidence Curve', desc: 'Distribution of detection confidences' },
            'confidence_dist.pdf': { title: 'Confidence Curve', desc: 'Distribution of detection confidences' },
            'annotated.mp4': { title: 'Annotated Video Export', desc: 'Rendered video with tracking overlays' },
            'heatmap.png': { title: 'Detection Confidence Density Map', desc: 'xAI spatial explanation — confidence-weighted Gaussian kernel density over all detections' },
            'heatmap.pdf': { title: 'Detection Confidence Density Map', desc: 'xAI spatial explanation — confidence-weighted Gaussian kernel density over all detections' },
            'raw_data.csv': { title: 'Raw Analytics Export', desc: 'Comma-separated values of all crossings' },
            'analysis.json': { title: 'Structured JSON Export', desc: 'Complete analysis data with metadata for API consumption' }
        };

        async function loadReports(videoId) {
            const res = await fetch(`reports/${videoId}`, { method: 'POST' });
            const data = await res.json();
            if (!data.files || !data.files.length) return null;

            const rPending = document.getElementById('reports-pending');
            if (rPending) rPending.classList.add('hidden');
            const rMsg = document.getElementById('reports-pending-message');
            if (rMsg) rMsg.classList.add('hidden');
            document.getElementById('post-process-cards').classList.remove('hidden');
            const grid = document.getElementById('reports-grid');
            grid.classList.remove('hidden');
            const mobileBtn = document.getElementById('mobile-download-wrap');
            if (mobileBtn) mobileBtn.classList.remove('hidden');
            grid.innerHTML = '';

            data.files.forEach(name => {
                const info = REPORT_LABELS[name] || { title: name, desc: '' };
                const url = `reports/${videoId}/${name}`;
                const isVideo = name.endsWith('.mp4');
                const isPDF = name.endsWith('.pdf');
                const isCSV = name.endsWith('.csv');
                const card = document.createElement('div');
                card.className = 'bg-black rounded-xl border border-slate-800 shadow-sm flex flex-col overflow-hidden';

                let previewHTML = '';
                if (isVideo) {
                    previewHTML = `
                        <div class="flex flex-col items-center justify-center py-12 text-slate-700">
                            <i class="fa-solid fa-film text-6xl mb-4 text-white"></i>
                            <span class="text-xs font-bold uppercase tracking-widest text-slate-500">Video Ready for Local Analysis</span>
                        </div>`;
                } else if (isPDF) {
                    previewHTML = `
                        <div class="flex flex-col items-center justify-center py-12 text-slate-700">
                            <i class="fa-solid fa-file-pdf text-6xl mb-4 text-white"></i>
                            <span class="text-xs font-bold uppercase tracking-widest text-slate-500">PDF Document</span>
                        </div>`;
                } else if (isCSV) {
                    previewHTML = `
                        <div class="flex flex-col items-center justify-center py-12 text-slate-700">
                            <i class="fa-solid fa-file-csv text-6xl mb-4 text-white"></i>
                            <span class="text-xs font-bold uppercase tracking-widest text-slate-500">Raw Analytics Export</span>
                        </div>`;
                } else if (name.endsWith('.json')) {
                    previewHTML = `
                        <div class="flex flex-col items-center justify-center py-12 text-slate-700">
                            <i class="fa-solid fa-code text-6xl mb-4 text-white"></i>
                            <span class="text-xs font-bold uppercase tracking-widest text-slate-500">Structured JSON</span>
                        </div>`;
                } else {
                    previewHTML = `<img src="${url}" alt="${info.title}" class="max-w-full max-h-[320px] object-contain rounded">`;
                }

                const isHeatmap = name.includes('heatmap');
                const tooltipHTML = isHeatmap ? `
                    <span class="info-wrap">
                        <span class="info-btn"><i class="fa-solid fa-info"></i></span>
                        <span class="info-tip">Confidence-weighted spatial density map — a faithful xAI explanation of WHERE the detector is most certain vehicles exist. Each detection stamps a Gaussian kernel scaled by its confidence score. Brighter regions = higher accumulated detection confidence.</span>
                    </span>` : '';

                card.innerHTML = `
                    <div class="px-5 py-3 border-b border-slate-800 bg-slate-900/40 flex justify-between items-center">
                        <div>
                            <h3 class="font-bold text-white text-sm flex items-center">${info.title}${tooltipHTML}</h3>
                            <p class="text-[10px] text-slate-400 mt-0.5">${info.desc}</p>
                        </div>
                        <a href="${url}" download="${name}"
                           class="inline-flex items-center gap-1.5 px-3 py-1.5 border border-[#444444] text-white text-[10px] font-bold rounded-full hover:bg-neutral-800 transition uppercase tracking-wider">
                            <i class="fa-solid fa-download text-[9px]"></i> Download
                        </a>
                    </div>
                    <div class="p-4 flex items-center justify-center bg-black/30">
                        ${previewHTML}
                    </div>
                `;
                grid.appendChild(card);
            });
            return data;
        }

        function toggleExportMaster(el) {
            el.classList.toggle('active');
            const chips = document.getElementById('chip-selector');
            if (el.classList.contains('active')) {
                chips.classList.remove('hidden-chip-container');
            } else {
                chips.classList.add('hidden-chip-container');
            }
        }

        function toggleAutoDownload(el) {
            el.classList.toggle('active');
        }

        function toggleChip(id) {
            const chip = document.getElementById(`chip-${id}`);
            chip.classList.toggle('active');
            const icon = chip.querySelector('i');
            if (chip.classList.contains('active')) {
                icon.className = 'fa-solid fa-check';
            } else {
                icon.className = 'fa-solid fa-plus';
            }
        }

        function toggleHelp(id) {
            const ans = document.getElementById(id + '-ans');
            const icon = document.getElementById(id + '-icon');
            if (ans.classList.contains('hidden')) {
                ans.classList.remove('hidden');
                icon.classList.replace('fa-plus', 'fa-minus');
            } else {
                ans.classList.add('hidden');
                icon.classList.replace('fa-minus', 'fa-plus');
            }
        }

    function showRetryBubble() {
        // Desktop has the sidebar nav always visible — the hint is redundant there.
        const isMobile = window.innerWidth < 1024;
        if (!isMobile) return;

        if (sessionStorage.getItem('uf_retry_shown')) return;
        sessionStorage.setItem('uf_retry_shown', '1');

        const existing = document.getElementById('retry-bubble');
        if (existing) existing.remove();
        const bubble   = document.createElement('div');
        bubble.id      = 'retry-bubble';

        Object.assign(bubble.style, {
            position:     'fixed',
            background:   '#111111',
            border:       '1px solid #c89a6c',
            borderRadius: '12px',
            padding:      '12px 16px',
            fontFamily:   'Montserrat, sans-serif',
            color:        '#f0ece6',
            zIndex:       '9000',
            boxShadow:    '0 8px 32px rgba(0,0,0,0.8)',
            maxWidth:     '220px',
            textAlign:    'center',
            lineHeight:   '1.4',
        });

        bubble.innerHTML = `
            <p style="color:#c89a6c;font-weight:800;font-size:13px;margin:0 0 5px 0">
                Want to try another video?
            </p>
            <p style="color:#a89f97;font-size:11px;margin:0">
                Tap <b style="color:#f0ece6">&#9881; Settings</b> &amp; click '<b style="color:#f0ece6">Home</b>'
            </p>
            <div id="retry-bubble-arrow"></div>
        `;

        // Append to fixed portal so overflow:hidden on body/main never clips it
        const portal = document.getElementById('fixed-portal') || document.body;
        portal.style.pointerEvents = 'none';
        bubble.style.pointerEvents = 'auto';
        portal.appendChild(bubble);

        if (isMobile) {
            // 7 icons in bottom nav. Settings = 4th (index 3).
            // Center of 4th icon = (3 + 0.5) / 7 = 50% of viewport width.
            const navH = parseInt(
                getComputedStyle(document.documentElement)
                    .getPropertyValue('--mob-nav-h') || '68', 10
            );
            const vpW  = window.innerWidth;
            const settingsCenterX = (3.5 / 7) * vpW;
            const bubbleW = bubble.offsetWidth || 220;
            const leftPx  = Math.max(8, Math.min(settingsCenterX - bubbleW / 2, vpW - bubbleW - 8));

            Object.assign(bubble.style, {
                bottom:    (navH + 10) + 'px',
                left:      leftPx + 'px',
                top:       'auto',
                right:     'auto',
                transform: 'none',
            });

            const arrowLeft = settingsCenterX - leftPx;
            const arrow = bubble.querySelector('#retry-bubble-arrow');
            Object.assign(arrow.style, {
                position:    'absolute',
                bottom:      '-8px',
                left:        arrowLeft + 'px',
                transform:   'translateX(-50%)',
                width:       '0', height: '0',
                borderLeft:  '8px solid transparent',
                borderRight: '8px solid transparent',
                borderTop:   '8px solid #c89a6c',
            });

        } else {
            // Desktop sidebar <aside class="w-60"> = 240px.
            // Settings is 5th nav link: logo(112px) + 4 items × 44px + 22px = 310px from top.
            const settingsY = 310;
            Object.assign(bubble.style, {
                left:      '256px',
                top:       (settingsY - 40) + 'px',
                bottom:    'auto',
                right:     'auto',
                transform: 'none',
                textAlign: 'left',
            });

            const arrow = bubble.querySelector('#retry-bubble-arrow');
            Object.assign(arrow.style, {
                position:     'absolute',
                left:         '-8px',
                top:          '50%',
                transform:    'translateY(-50%)',
                width:        '0', height: '0',
                borderTop:    '8px solid transparent',
                borderBottom: '8px solid transparent',
                borderRight:  '8px solid #c89a6c',
            });
        }

        bubble.addEventListener('click', () => bubble.remove());
        setTimeout(() => {
            const el = document.getElementById('retry-bubble');
            if (el) el.remove();
        }, 6000);
    }


        // =========== Auth & Profile UI ===========

        function populateProfileUI() {
            const session = (typeof getAuthSession === 'function') ? getAuthSession() : null;
            if (!session) return;

            // Update PFP in Desktop Sidebar
            const sidebarPfp = document.getElementById('sidebar-profile-pfp-wrap');
            if (sidebarPfp && session.picture) {
                sidebarPfp.innerHTML = `<img src="${session.picture}" alt="" class="w-full h-full object-cover rounded-full" referrerpolicy="no-referrer">`;
            }

            // Update PFP in Mobile Bottom Nav
            const mobPfp = document.getElementById('mob-pfp-wrap');
            if (mobPfp && session.picture) {
                mobPfp.innerHTML = `<img src="${session.picture}" alt="" class="w-full h-full object-cover rounded-full" referrerpolicy="no-referrer">`;
            }

            // Sync Palette Preference
            const savedPalette = localStorage.getItem('uf_pref_palette') || 'default';
            const paletteInp = document.getElementById('pref-palette');
            if (paletteInp) {
                paletteInp.value = savedPalette;
                const label = document.getElementById('pref-palette-label');
                if (label) label.innerText = savedPalette.charAt(0).toUpperCase() + savedPalette.slice(1);
            }
        }

        function populateProfileTab() {
            const session = (typeof getAuthSession === 'function') ? getAuthSession() : null;
            if (!session) return;

            // Identity
            const pfpLarge = document.getElementById('profile-pfp-large');
            if (pfpLarge && session.picture) pfpLarge.src = session.picture;
            
            const emailEl = document.getElementById('profile-email');
            if (emailEl) emailEl.innerText = session.email;

            const nameInp = document.getElementById('profile-username-input');
            if (nameInp) nameInp.value = session.username || session.name || '';

            // Stats (Scoped by email)
            const emailKey = `_${session.email}`;
            const totalRuns = localStorage.getItem(`uf_total_runs${emailKey}`) || '0';
            const lastActive = localStorage.getItem(`uf_last_active${emailKey}`) || 'Never';
            
            if (document.getElementById('profile-total-runs')) 
                document.getElementById('profile-total-runs').innerText = totalRuns;
            if (document.getElementById('profile-last-active')) 
                document.getElementById('profile-last-active').innerText = lastActive;
        }

        async function saveProfileUsername() {
            const session = (typeof getAuthSession === 'function') ? getAuthSession() : null;
            if (!session) return;

            const input = document.getElementById('profile-username-input');
            const newName = input.value.trim();
            if (!newName) return showToast('Name cannot be empty', 'error');

            const btn = document.getElementById('btn-save-username');
            btn.disabled = true;
            btn.innerText = 'Saving...';

            try {
                // Save locally first (always works)
                session.username = newName;
                if (typeof saveAuthSession === 'function') saveAuthSession(session);

                // Try backend as best-effort
                fetch('api/auth/onboard', {
                    method: 'POST',
                    headers: { 'Content-Type': 'application/json' },
                    body: JSON.stringify({ email: session.email, username: newName })
                }).catch(() => {});
                
                showToast('Profile updated successfully', 'success');
                populateProfileUI();
            } catch (err) {
                showToast('Failed to update profile', 'error');
            } finally {
                btn.disabled = false;
                btn.innerText = 'Save';
            }
        }

        function toggleLegalMenu(e) {
            e.stopPropagation();
            const menus = ['legal-menu', 'legal-menu-profile'];
            menus.forEach(m => {
                const el = document.getElementById(m);
                if (el) el.classList.toggle('hidden');
            });
            
            // Close on click outside
            const closer = () => {
                menus.forEach(m => {
                    const el = document.getElementById(m);
                    if (el) el.classList.add('hidden');
                });
                window.removeEventListener('click', closer);
            };
            window.addEventListener('click', closer);
        }

        // Palette Persistence
        document.addEventListener('change', (e) => {
            if (e.target.id === 'pref-palette') {
                localStorage.setItem('uf_pref_palette', e.target.value);
                showToast(`Palette preference saved: ${e.target.value}`, 'success');
            }
        });


        document.addEventListener('DOMContentLoaded', () => {
            // Phase 1: instant visual — show the shell immediately on first paint
            const activeTab = sessionStorage.getItem('uf_active_tab') || 'settings';
            switchTab(activeTab);

            // Phase 2: defer all heavy init until after browser completes first paint
            requestAnimationFrame(() => {
                setTimeout(initApp, 0);
            });
        });