/**
 * 智能垃圾分类系统 - 高级交互 v3
 * Minimalist premium design with haptic feedback + object identification
 */

(function () {
    'use strict';

    // ============================================
    // 工具函数
    // ============================================
    const $ = (sel) => document.querySelector(sel);
    const $$ = (sel) => document.querySelectorAll(sel);

    // 触觉反馈
    function haptic(pattern = 10) {
        if (navigator.vibrate) {
            navigator.vibrate(pattern);
        }
    }

    // 涟漪效果
    function createRipple(e, element) {
        const ripple = document.createElement('span');
        ripple.className = 'ripple-effect';

        const rect = element.getBoundingClientRect();
        const size = Math.max(rect.width, rect.height);
        const x = (e.touches ? e.touches[0].clientX : e.clientX) - rect.left - size / 2;
        const y = (e.touches ? e.touches[0].clientY : e.clientY) - rect.top - size / 2;

        ripple.style.width = ripple.style.height = size + 'px';
        ripple.style.left = x + 'px';
        ripple.style.top = y + 'px';

        const container = $('#rippleContainer') || document.body;
        container.appendChild(ripple);
        ripple.addEventListener('animationend', () => ripple.remove());
    }

    // 为所有带 data-ripple 的元素添加点击效果
    function initRipples() {
        $$('[data-ripple]').forEach(el => {
            el.addEventListener('click', function (e) {
                haptic();
                createRipple(e, this);
            });
            el.addEventListener('touchstart', function (e) {
                haptic(8);
            }, { passive: true });
        });
    }

    // 鼠标跟踪光晕
    function initGlowTracking() {
        const placeholder = $('#uploadPlaceholder');
        if (!placeholder) return;
        placeholder.addEventListener('mousemove', (e) => {
            const rect = placeholder.getBoundingClientRect();
            const x = ((e.clientX - rect.left) / rect.width) * 100;
            const y = ((e.clientY - rect.top) / rect.height) * 100;
            placeholder.style.setProperty('--mx', x + '%');
            placeholder.style.setProperty('--my', y + '%');
        });
    }

    // 物品识别 emoji 图标
    function getObjectEmoji(name) {
        if (!name) return '📦';
        const emojiMap = [
            ['水瓶', '🦴'], ['玻璃杯', '🥛'], ['咖啡杯', '☕'], ['茶杯', '🛖'],
            ['易拉罐', '🥛'], ['保温杯', '🧢'], ['啤酒瓶', '🍺'],
            ['塑料杯', '🥤'], ['纸杯', '🥤'],
            ['盘子', '🍽️'], ['碗', '🥣'], ['筷子', '🥢'], ['叉子', '🍴'],
            ['勺子', '🥄'], ['刀', '🔪'],
            ['外卖盒', '📦'], ['食物容器', '🍱'],
            ['苹果', '🍎'], ['香蕉', '🍌'], ['橙子', '🍊'],
            ['面包', '🍞'], ['蛋糕', '🎂'], ['饼干', '🍪'],
            ['鸡蛋', '🥚'], ['米饭', '🍚'], ['面条', '🍜'],
            ['三明治', '🥪'], ['披萨', '🍕'],
            ['巧克力', '🍫'], ['水果', '🍉'], ['蔬菜', '🥬'],
            ['西瓜', '🍉'], ['葡萄', '🍇'], ['草莓', '🍓'],
            ['薯片', '🥨'], ['泡面', '🍜'],
            ['手机', '📱'], ['笔记本', '💻'], ['平板', '📱'],
            ['耳机', '🎧'], ['充电线', '🔌'], ['遥控器', '📟'],
            ['键盘', '⌨️'], ['鼠标', '🖱️'], ['相机', '📷'],
            ['充电宝', '🔋'],
            ['T恤', '👕'], ['裤子', '👖'], ['鞋子', '👟'],
            ['帽子', '🧢'], ['外套', '🧥'], ['袜子', '🧦'],
            ['背包', '🎒'], ['手提包', '👜'], ['钱包', '👛'],
            ['手套', '🧤'], ['围巾', '🧣'], ['墨镜', '🕶️'],
            ['书本', '📚'], ['笔记本', '📓'], ['笔', '✏️'],
            ['铅笔', '✏️'], ['剪刀', '✂️'],
            ['报纸', '📰'], ['杂志', '📰'], ['纸张', '📄'],
            ['纸箱', '📦'], ['信封', '✉️'],
            ['钥匙', '🔑'], ['雨伞', '☂️'], ['眼镜', '👓'],
            ['牙刷', '🦷'], ['毛巾', '🦴'], ['肥皂', '🧼'],
            ['洗发水', '🦴'], ['纸巾盒', '📦'],
            ['垃圾袋', '🗑️'], ['塑料袋', '🛍️'],
            ['枕头', '🛏️'], ['毯子', '🛌'], ['靠垫', '🛋️'],
            ['玻璃罐', '🥙'], ['金属罐', '🥛'], ['牛奶盒', '🥛'],
            ['塑料瓶', '🦴'],
            ['锤子', '🔨'], ['螺丝刀', '🪛'], ['扳手', '🔧'],
            ['钳子', '🔧'], ['手电筒', '🔦'],
            ['足球', '⚽'], ['篮球', '🏀'], ['网球', '🎾'],
            ['棒球', '⚾'], ['飞盘', '🥏'],
            ['口罩', '😷'], ['烟蒂', '🚬'],
            ['电池', '🔋'], ['灯泡', '💡'], ['药片', '💊'],
            ['尿不湿', '👶'], ['湿巾', '🧻'],
            ['吸管', '🥤'], ['牙签', '🦷'], ['棉签', '🦷'],
            ['创可贴', '🪹'],
            ['花', '🌸'], ['盆栽', '🪴'],
            ['玩具', '🧸'], ['毛绒', '🧸'],
            ['口红', '💄'], ['化妆刷', '🖌️'], ['指甲油', '💅'],
            ['梳子', '🪮'], ['剃须刀', '🪒'],
            ['海绵', '🧽'], ['抹布', '🧹'], ['扫把', '🧹'],
            ['洗衣液', '🦴'],
            ['泡面桶', '🍜'], ['一次性筷子', '🥢'],
            ['纸碗', '🥣'], ['泡沫饭盒', '📦'],
        ];
        for (const [key, emoji] of emojiMap) {
            if (name.includes(key)) return emoji;
        }
        return '📦';
    }

    // ============================================
    // DOM 元素
    // ============================================
    const uploadArea = $('#uploadArea');
    const uploadPlaceholder = $('#uploadPlaceholder');
    const uploadPreview = $('#uploadPreview');
    const previewImage = $('#previewImage');
    const fileInput = $('#fileInput');
    const fileInputCamera = $('#fileInputCamera');
    const btnCamera = $('#btnCamera');
    const btnGallery = $('#btnGallery');
    const btnUpload = $('#btnUpload');
    const btnRemove = $('#btnRemove');
    const btnAgain = $('#btnAgain');
    const btnErrorRetry = $('#btnErrorRetry');

    const uploadSection = $('#uploadSection');
    const loadingSection = $('#loadingSection');
    const resultSection = $('#resultSection');
    const errorSection = $('#errorSection');

    const resultCard = $('#resultCard');
    const resultAccent = $('#resultAccent');
    const badgeIcon = $('#badgeIcon');
    const badgeText = $('#badgeText');
    const binLabel = $('#binLabel');
    const binDesc = $('#binDesc');
    const examplesText = $('#examplesText');
    const tipText = $('#tipText');
    const binVisual = $('#binVisual');
    const detectedItem = $('#detectedItem');
    const detectedConfidence = $('#detectedConfidence');
    const otherPredictions = $('#otherPredictions');
    const predictionList = $('#predictionList');
    const uploadActions = $('#uploadActions');

    // DNA 知识卡片 DOM
    const dnaSection = $('#dnaSection');
    const dnaCard = $('#dnaCard');
    const dnaMaterial = $('#dnaMaterial');
    const dnaDecomposition = $('#dnaDecomposition');
    const dnaDecompositionDesc = $('#dnaDecompositionDesc');
    const dnaRecycledInto = $('#dnaRecycledInto');
    const dnaProcess = $('#dnaProcess');
    const dnaCo2Row = $('#dnaCo2Row');
    const dnaCo2Text = $('#dnaCo2Text');
    const dnaTips = $('#dnaTips');
    const dnaFacts = $('#dnaFacts');

    // 物品识别 DOM
    const identifySection = $('#identifySection');
    const objectName = $('#objectName');
    const objectConfidence = $('#objectConfidence');
    const objectIcon = $('#objectIcon');

    const errorTitle = $('#errorTitle');
    const errorDetail = $('#errorDetail');

    // ============================================
    // 状态
    // ============================================
    let selectedFile = null;
    let isProcessing = false;
    let currentMode = 'single'; // 'single' | 'multi'
    let multiObjects = []; // 多物体结果缓存
    let selectedMultiIndex = 0;

    // ============================================
    // 映射
    // ============================================
    const BIN_COLORS = {
        '可回收垃圾': { class: 'bg-blue', color: '#5b9cf5', label: '蓝色垃圾桶' },
        '有害垃圾': { class: 'bg-red', color: '#f56b6b', label: '红色垃圾桶' },
        '厨余垃圾': { class: 'bg-green', color: '#5bd68a', label: '绿色垃圾桶' },
        '其他垃圾': { class: 'bg-gray', color: '#8a8a9a', label: '灰色/黑色垃圾桶' },
    };

    const BIN_ICONS = {
        '可回收垃圾': '♻️',
        '有害垃圾': '☣️',
        '厨余垃圾': '🍚',
        '其他垃圾': '🗑️',
    };

    // ============================================
    // 页面切换
    // ============================================
    function showSection(section) {
        [uploadSection, loadingSection, resultSection, errorSection].forEach(s => {
            s.style.display = 'none';
        });
        section.style.display = 'flex';
        section.style.animation = 'none';
        void section.offsetWidth;
        section.style.animation = '';
    }

    // ============================================
    // 文件选择
    // ============================================
    function handleFileSelect(file) {
        if (!file) return;

        const validTypes = ['image/jpeg', 'image/png', 'image/webp', 'image/bmp', 'image/gif'];
        if (!validTypes.includes(file.type) && !file.type.startsWith('image/')) {
            showError('不支持的文件格式', '请选择 JPG、PNG 或 WebP 格式的图片');
            haptic(20);
            return;
        }

        if (file.size > 10 * 1024 * 1024) {
            showError('图片太大', `文件 ${(file.size / 1024 / 1024).toFixed(1)}MB，请选择小于 10MB 的图片`);
            haptic(20);
            return;
        }

        selectedFile = file;
        btnUpload.disabled = false;
        haptic(12);

        const reader = new FileReader();
        reader.onload = function (e) {
            previewImage.src = e.target.result;
            uploadPlaceholder.style.display = 'none';
            uploadPreview.style.display = 'block';
            if (uploadActions) uploadActions.style.display = 'none';
        };
        reader.readAsDataURL(file);
    }

    uploadPlaceholder.addEventListener('click', () => {
        haptic(6);
        fileInput.click();
    });

    fileInput.addEventListener('change', (e) => {
        if (e.target.files && e.target.files[0]) {
            handleFileSelect(e.target.files[0]);
        }
    });

    if (btnCamera) {
        btnCamera.addEventListener('click', () => {
            haptic(10);
            fileInputCamera.click();
        });
    }

    if (btnGallery) {
        btnGallery.addEventListener('click', () => {
            haptic(10);
            fileInput.click();
        });
    }

    if (fileInputCamera) {
        fileInputCamera.addEventListener('change', (e) => {
            if (e.target.files && e.target.files[0]) {
                handleFileSelect(e.target.files[0]);
            }
        });
    }

    btnRemove.addEventListener('click', (e) => {
        e.stopPropagation();
        haptic(6);
        resetUpload();
    });

    // ============================================
    // 模式切换 (单物体 / 多物体)
    // ============================================
    const modeSingle = $('#modeSingle');
    const modeMulti = $('#modeMulti');
    const multiResultSection = $('#multiResultSection');
    const multiResultImage = $('#multiResultImage');
    const multiBboxCanvas = $('#multiBboxCanvas');

    function switchMode(mode) {
        currentMode = mode;
        document.querySelectorAll('.mode-btn').forEach(btn => {
            btn.classList.toggle('mode-btn--active', btn.dataset.mode === mode);
        });
        haptic(6);
    }

    if (modeSingle) {
        modeSingle.addEventListener('click', () => switchMode('single'));
    }
    if (modeMulti) {
        modeMulti.addEventListener('click', () => switchMode('multi'));
    }

    function resetUpload() {
        selectedFile = null;
        btnUpload.disabled = true;
        fileInput.value = '';
        fileInputCamera.value = '';
        previewImage.src = '';
        uploadPreview.style.display = 'none';
        uploadPlaceholder.style.display = 'flex';
        if (uploadActions) uploadActions.style.display = 'grid';
    }

    // ============================================
    // 拖放
    // ============================================
    let dragCounter = 0;

    uploadArea.addEventListener('dragenter', (e) => {
        e.preventDefault();
        e.stopPropagation();
        dragCounter++;
        uploadPlaceholder.classList.add('dragover');
    });

    uploadArea.addEventListener('dragleave', (e) => {
        e.preventDefault();
        e.stopPropagation();
        dragCounter--;
        if (dragCounter === 0) {
            uploadPlaceholder.classList.remove('dragover');
        }
    });

    uploadArea.addEventListener('dragover', (e) => {
        e.preventDefault();
        e.stopPropagation();
    });

    uploadArea.addEventListener('drop', (e) => {
        e.preventDefault();
        e.stopPropagation();
        dragCounter = 0;
        uploadPlaceholder.classList.remove('dragover');
        const files = e.dataTransfer.files;
        if (files && files[0]) {
            handleFileSelect(files[0]);
        }
    });

    // ============================================
    // 分类请求
    // ============================================
    async function classifyImage() {
        if (!selectedFile || isProcessing) return;

        isProcessing = true;
        btnUpload.disabled = true;
        haptic(15);

        showSection(loadingSection);

        try {
            const formData = new FormData();
            formData.append('file', selectedFile);

            // 根据模式选择端点
            const endpoint = currentMode === 'multi' ? '/api/classify-multi' : '/api/classify';
            const response = await fetch(endpoint, {
                method: 'POST',
                body: formData,
            });

            if (!response.ok) {
                let detail = '服务器处理出错';
                try {
                    const errData = await response.json();
                    detail = errData.detail || detail;
                } catch (e) { }
                throw new Error(detail);
            }

            const result = await response.json();

            await new Promise(r => setTimeout(r, 600));

            if (currentMode === 'multi' && result.multi) {
                showMultiResult(result);
            } else {
                showResult(result);
            }

        } catch (err) {
            console.error('分类出错:', err);
            await new Promise(r => setTimeout(r, 400));
            showError('识别失败', err.message || '网络错误，请检查连接后重试');
        } finally {
            isProcessing = false;
            btnUpload.disabled = !selectedFile;
        }
    }

    btnUpload.addEventListener('click', classifyImage);

    document.addEventListener('keydown', (e) => {
        if (e.key === 'Enter' && selectedFile && !isProcessing) {
            const visible = uploadSection.style.display !== 'none';
            if (visible) classifyImage();
        }
    });

    // ============================================
    // 展示结果
    // ============================================
    function showResult(result) {
        haptic(20);

        if (!result.success) {
            showError('识别失败', '模型未能识别该图片中的垃圾类型，请换一张照片试试');
            return;
        }

        const category = result.category || '其他垃圾';
        const binColor = BIN_COLORS[category] || BIN_COLORS['其他垃圾'];

        // 卡片样式
        resultCard.className = 'result-card ' + binColor.class;

        // 徽章
        badgeIcon.textContent = BIN_ICONS[category] || '🗑️';
        badgeText.textContent = category;
        binLabel.textContent = binColor.label;

        // 信息
        const binInfo = result.category_info || {};
        binDesc.textContent = binInfo.description || '';
        examplesText.textContent = binInfo.examples || '';
        tipText.textContent = binInfo.tip || '';

        // 物品识别
        if (result.object && result.object.name) {
            identifySection.style.display = 'flex';
            // 优先使用自然描述（含OCR文字），其次用物品名
            const displayText = result.object.description || result.object.name_zh || result.object.name;
            objectName.textContent = displayText;
            const objConfPct = (result.object.confidence * 100).toFixed(1);
            objectConfidence.textContent = objConfPct + '%';
            objectConfidence.style.color = result.object.confidence > 0.5
                ? 'var(--color-green)'
                : result.object.confidence > 0.3
                    ? '#f0a030'
                    : 'var(--color-red)';
            objectIcon.textContent = getObjectEmoji(result.object.name_zh || '');
        } else {
            identifySection.style.display = 'none';
        }

        // 详情
        detectedItem.textContent = result.item_zh || result.item || '-';
        const confPct = (result.confidence * 100).toFixed(1);
        detectedConfidence.textContent = confPct + '%';

        const confNum = result.confidence;
        detectedConfidence.style.color = confNum > 0.7
            ? 'var(--color-green)'
            : confNum > 0.4
                ? '#f0a030'
                : 'var(--color-red)';

        // 可能分类
        if (result.predictions && result.predictions.length > 1) {
            otherPredictions.style.display = 'block';
            predictionList.innerHTML = '';

            result.predictions.forEach((p, index) => {
                const score = (p.score * 100).toFixed(1);
                const item = document.createElement('div');
                item.className = 'prediction-item';
                item.style.animationDelay = (index * 0.1) + 's';

                const barWidth = Math.max(p.score * 100, 3);

                item.innerHTML = `
                    <span class="prediction-label">${p.label_zh || p.label}</span>
                    <div class="prediction-bar">
                        <div class="prediction-bar-fill"></div>
                    </div>
                    <span class="prediction-score">${score}%</span>
                `;

                predictionList.appendChild(item);

                setTimeout(() => {
                    const fill = item.querySelector('.prediction-bar-fill');
                    if (fill) fill.style.width = barWidth + '%';
                }, 200 + index * 150);
            });
        } else {
            otherPredictions.style.display = 'none';
        }

        // 渲染垃圾 DNA 知识卡片
        renderDnaCard(result.dna);

        showSection(resultSection);

        // 每日挑战追踪
        ChallengeTracker.track();

        // 碳足迹追踪
        CarbonTracker.track(result);

        // 保存到图鉴
        Atlas.addEntry(previewImage, result);

        setTimeout(() => {
            resultSection.scrollIntoView({ behavior: 'smooth', block: 'center' });
        }, 100);

        haptic([10, 50, 10]);
    }

    // ============================================
    // 垃圾 DNA 知识卡片渲染
    // ============================================
    function renderDnaCard(dna) {
        if (!dna || !dna.material) {
            dnaSection.style.display = 'none';
            return;
        }

        dnaSection.style.display = 'block';

        // 材质
        dnaMaterial.textContent = dna.material;

        // 降解时间
        const years = dna.decomposition_years;
        if (years !== null && years !== undefined) {
            let timeStr;
            if (years >= 1000000) {
                timeStr = '约 ' + (years / 10000).toFixed(0) + ' 万年';
            } else if (years >= 10000) {
                timeStr = '约 ' + (years / 10000).toFixed(1) + ' 万年';
            } else if (years >= 100) {
                timeStr = '约 ' + years.toFixed(0) + ' 年';
            } else if (years >= 1) {
                timeStr = '约 ' + years.toFixed(0) + ' 年';
            } else {
                timeStr = '约 ' + (years * 12).toFixed(0) + ' 个月';
            }
            dnaDecomposition.textContent = timeStr;
        } else {
            dnaDecomposition.textContent = '极难自然降解';
        }
        dnaDecompositionDesc.textContent = dna.decomposition_desc || '';

        // 回收后可变成
        dnaRecycledInto.innerHTML = '';
        if (dna.recycled_into && dna.recycled_into.length > 0) {
            dna.recycled_into.forEach((item, index) => {
                const tag = document.createElement('span');
                tag.className = 'dna-tag';
                tag.textContent = item;
                tag.style.animationDelay = (index * 0.08) + 's';
                dnaRecycledInto.appendChild(tag);
            });
        }

        // 回收流程
        dnaProcess.textContent = dna.recycling_process || '';

        // 环境效益（碳减排）
        if (dna.co2_saving_kg !== null && dna.co2_saving_kg !== undefined) {
            dnaCo2Row.style.display = 'flex';
            let co2Text = '每件回收可减少 ' + dna.co2_saving_kg.toFixed(1) + ' kg CO₂ 排放';
            if (dna.tree_saving) {
                co2Text += '，相当于种了 ' + dna.tree_saving.toFixed(2) + ' 棵树';
            }
            dnaCo2Text.textContent = co2Text;
        } else {
            dnaCo2Row.style.display = 'none';
        }

        // 投放建议
        dnaTips.innerHTML = '';
        if (dna.disposal_tips && dna.disposal_tips.length > 0) {
            dna.disposal_tips.forEach((tip, index) => {
                const li = document.createElement('li');
                li.textContent = tip;
                li.style.animationDelay = (index * 0.06) + 's';
                dnaTips.appendChild(li);
            });
        }

        // 趣味知识
        dnaFacts.innerHTML = '';
        if (dna.fun_facts && dna.fun_facts.length > 0) {
            dna.fun_facts.forEach((fact, index) => {
                const li = document.createElement('li');
                li.textContent = fact;
                li.style.animationDelay = (index * 0.08) + 's';
                dnaFacts.appendChild(li);
            });
        }

        // 入场动画
        dnaCard.style.animation = 'none';
        void dnaCard.offsetWidth;
        dnaCard.style.animation = 'dnaFadeIn 0.6s ease-out forwards';
    }

    // ============================================
    // 错误处理
    // ============================================
    // ============================================
    // 多物体识别 — 结果展示
    // ============================================

    function showMultiResult(result) {
        haptic(20);

        if (!result.success || !result.objects || result.objects.length === 0) {
            showError('识别失败', '多物体识别未检测到有效物品');
            return;
        }

        multiObjects = result.objects;
        selectedMultiIndex = 0;

        // 显示图片 + 绘制 Bounding Box
        const imageUrl = previewImage.src;
        multiResultImage.src = imageUrl;
        multiResultImage.onload = function() {
            drawMultiBboxes(multiResultImage, multiBboxCanvas, multiObjects, selectedMultiIndex);
        };
        // 如果图片已经加载完成
        if (multiResultImage.complete && multiResultImage.naturalWidth > 0) {
            drawMultiBboxes(multiResultImage, multiBboxCanvas, multiObjects, selectedMultiIndex);
        }

        // 渲染物体标签
        renderMultiTabs(multiObjects);

        // 选中第一个物体显示详情
        selectMultiObject(0);

        // 隐藏其他 section，显示多物体结果
        [uploadSection, loadingSection, resultSection, errorSection].forEach(s => {
            s.style.display = 'none';
        });
        multiResultSection.style.display = 'flex';
        multiResultSection.style.animation = 'none';
        void multiResultSection.offsetWidth;
        multiResultSection.style.animation = '';

        // 碳足迹追踪
        CarbonTracker.trackMulti(result.objects);

        // 图鉴
        Atlas.addEntry(previewImage, {
            item_zh: result.objects.map(o => o.label_zh).join(' + '),
            category: result.overall || '多物体',
            confidence: result.objects[0]?.confidence || 0,
        });

        setTimeout(() => {
            multiResultSection.scrollIntoView({ behavior: 'smooth', block: 'start' });
        }, 100);

        haptic([10, 50, 10]);
    }

    function drawMultiBboxes(imgEl, canvasEl, objects, highlightIndex) {
        if (!canvasEl || !imgEl) return;

        const rect = imgEl.getBoundingClientRect();
        const w = rect.width;
        const h = rect.height;

        // canvas 尺寸匹配显示尺寸
        canvasEl.width = w;
        canvasEl.height = h;

        const ctx = canvasEl.getContext('2d');
        ctx.clearRect(0, 0, w, h);

        // 图片实际渲染尺寸（保持比例）
        const iw = imgEl.naturalWidth || 1;
        const ih = imgEl.naturalHeight || 1;
        const scale = Math.min(w / iw, h / ih);
        const ox = (w - iw * scale) / 2;
        const oy = (h - ih * scale) / 2;

        const COLORS = ['#5bd68a', '#5b9cf5', '#f5a623', '#f56b6b', '#9b59b6', '#1abc9c'];

        objects.forEach((obj, index) => {
            if (!obj.bbox) return;

            const color = COLORS[index % COLORS.length];
            const isHighlight = index === highlightIndex;
            const box = obj.bbox;
            const x = ox + box.xmin * scale;
            const y = oy + box.ymin * scale;
            const bw = (box.xmax - box.xmin) * scale;
            const bh = (box.ymax - box.ymin) * scale;

            ctx.lineWidth = isHighlight ? 3 : 1.5;
            ctx.strokeStyle = color;
            ctx.globalAlpha = isHighlight ? 1 : 0.6;
            ctx.strokeRect(x, y, bw, bh);

            // 标签背景
            const label = obj.label_zh || obj.label || `物体${index + 1}`;
            const conf = obj.confidence ? (obj.confidence * 100).toFixed(0) + '%' : '';
            const text = `#${index + 1} ${label} ${conf}`;
            ctx.font = 'bold 12px "Noto Sans SC", sans-serif';
            const metrics = ctx.measureText(text);
            const tw = metrics.width + 10;
            const th = 22;
            // 标签画在方框上方
            const lx = x;
            const ly = y - th > 0 ? y - th : y + bh;

            ctx.fillStyle = color;
            ctx.globalAlpha = isHighlight ? 0.95 : 0.75;
            ctx.beginPath();
            ctx.roundRect(lx, ly, Math.min(tw, w - lx - 4), th, 4);
            ctx.fill();

            ctx.fillStyle = '#fff';
            ctx.globalAlpha = 1;
            ctx.fillText(text, lx + 5, ly + 15);
        });
    }

    // 渲染物体切换标签
    function renderMultiTabs(objects) {
        const container = $('#multiTabs');
        if (!container) return;

        const COLORS = ['#5bd68a', '#5b9cf5', '#f5a623', '#f56b6b', '#9b59b6', '#1abc9c'];

        container.innerHTML = objects.map((obj, index) => {
            const color = COLORS[index % COLORS.length];
            const catIcon = BIN_ICONS[obj.category] || '🗑️';
            return `
                <button class="multi-tab ${index === selectedMultiIndex ? 'multi-tab--active' : ''}"
                        data-index="${index}" data-ripple>
                    <span class="multi-tab-index" style="background:${color}">${index + 1}</span>
                    <span>${obj.label_zh || obj.label}</span>
                    <span style="font-size:0.7rem;opacity:0.6">${catIcon}</span>
                </button>
            `;
        }).join('');

        // 绑定事件
        container.querySelectorAll('.multi-tab').forEach(tab => {
            tab.addEventListener('click', function() {
                const idx = parseInt(this.dataset.index);
                selectMultiObject(idx);
                haptic(6);
            });
        });
    }

    function selectMultiObject(index) {
        if (!multiObjects[index]) return;
        selectedMultiIndex = index;
        const obj = multiObjects[index];

        // 更新标签高亮
        document.querySelectorAll('.multi-tab').forEach(tab => {
            tab.classList.toggle('multi-tab--active', parseInt(tab.dataset.index) === index);
        });

        // 更新 bounding box 高亮
        drawMultiBboxes(multiResultImage, multiBboxCanvas, multiObjects, index);

        // 更新详情卡片
        const binName = (BIN_COLORS[obj.category] || BIN_COLORS['其他垃圾']).class;
        const binColor = (BIN_COLORS[obj.category] || BIN_COLORS['其他垃圾']).color;

        $('#multiDetailCard').className = 'multi-detail-card ' + binName;
        $('#multiDetailAccent').style.background = binColor;
        $('#multiBadgeIcon').textContent = BIN_ICONS[obj.category] || '🗑️';
        $('#multiBadgeText').textContent = obj.category;

        // 物品识别
        if (obj.object && obj.object.name) {
            const displayText = obj.object.description || obj.object.name_zh || obj.object.name;
            $('#multiObjectName').textContent = displayText;
            const objConf = (obj.object.confidence * 100).toFixed(1);
            $('#multiObjectConfidence').textContent = objConf + '%';
            $('#multiObjectConfidence').style.color = obj.object.confidence > 0.5
                ? 'var(--color-green)' : obj.object.confidence > 0.3 ? '#f0a030' : 'var(--color-red)';
            $('#multiObjectIcon').textContent = getObjectEmoji(obj.object.name_zh || '');
            $('#multiIdentifySection').style.display = 'flex';
        } else {
            $('#multiIdentifySection').style.display = 'none';
        }

        // 垃圾桶
        const info = obj.category_info || {};
        $('#multiBinLabel').textContent = (BIN_COLORS[obj.category] || BIN_COLORS['其他垃圾']).label;
        $('#multiBinBody').style.background = binColor;
        $('#multiBinDesc').textContent = info.description || '';
        $('#multiExamplesText').textContent = info.examples || '';
        $('#multiTipText').textContent = info.tip || '';

        // DNA
        renderMultiDna(obj.dna);

        // 详情
        $('#multiDetectedItem').textContent = obj.label_zh || obj.label || '-';
        const confPct = (obj.confidence * 100).toFixed(1);
        $('#multiDetectedConfidence').textContent = confPct + '%';
        $('#multiDetectedConfidence').style.color = obj.confidence > 0.7
            ? 'var(--color-green)' : obj.confidence > 0.4 ? '#f0a030' : 'var(--color-red)';
    }

    function renderMultiDna(dna) {
        const section = $('#multiDnaSection');
        const body = $('#multiDnaBody');

        if (!dna || !dna.material) {
            section.style.display = 'none';
            return;
        }
        section.style.display = 'block';

        const years = dna.decomposition_years;
        let timeStr = '极难自然降解';
        if (years !== null && years !== undefined) {
            if (years >= 1000000) timeStr = '约 ' + (years / 10000).toFixed(0) + ' 万年';
            else if (years >= 10000) timeStr = '约 ' + (years / 10000).toFixed(1) + ' 万年';
            else if (years >= 1) timeStr = '约 ' + years.toFixed(0) + ' 年';
            else timeStr = '约 ' + (years * 12).toFixed(0) + ' 个月';
        }

        let tagsHtml = '';
        if (dna.recycled_into && dna.recycled_into.length > 0) {
            tagsHtml = dna.recycled_into.map(t =>
                `<span class="dna-tag">${t}</span>`
            ).join('');
        }

        let tipsHtml = '';
        if (dna.disposal_tips && dna.disposal_tips.length > 0) {
            tipsHtml = dna.disposal_tips.map(t => `<li>${t}</li>`).join('');
        }

        let factsHtml = '';
        if (dna.fun_facts && dna.fun_facts.length > 0) {
            factsHtml = dna.fun_facts.map(f => `<li>${f}</li>`).join('');
        }

        let co2Html = '';
        if (dna.co2_saving_kg !== null && dna.co2_saving_kg !== undefined) {
            let co2Text = `每件回收可减少 ${dna.co2_saving_kg.toFixed(1)} kg CO₂ 排放`;
            if (dna.tree_saving) co2Text += `，相当于种了 ${dna.tree_saving.toFixed(2)} 棵树`;
            co2Html = `
                <div class="dna-row dna-row-co2">
                    <div class="dna-row-icon">🌱</div>
                    <div class="dna-row-content">
                        <div class="dna-row-label">环境效益</div>
                        <div class="dna-row-value">${co2Text}</div>
                    </div>
                </div>
            `;
        }

        body.innerHTML = `
            <div class="dna-row dna-row-material">
                <div class="dna-row-icon">🧪</div>
                <div class="dna-row-content">
                    <div class="dna-row-label">材质构成</div>
                    <div class="dna-row-value">${dna.material}</div>
                </div>
            </div>
            <div class="dna-row dna-row-decomposition">
                <div class="dna-row-icon">⏳</div>
                <div class="dna-row-content">
                    <div class="dna-row-label">自然降解时间</div>
                    <div class="dna-row-value">${timeStr}</div>
                    <div class="dna-row-sub">${dna.decomposition_desc || ''}</div>
                </div>
            </div>
            ${tagsHtml ? `
            <div class="dna-row dna-row-recycle">
                <div class="dna-row-icon">♻️</div>
                <div class="dna-row-content">
                    <div class="dna-row-label">回收后可变成</div>
                    <div class="dna-row-tags">${tagsHtml}</div>
                </div>
            </div>` : ''}
            ${co2Html}
            ${tipsHtml ? `
            <div class="dna-row dna-row-tips">
                <div class="dna-row-icon">💡</div>
                <div class="dna-row-content">
                    <div class="dna-row-label">投放小贴士</div>
                    <ul class="dna-tips-list">${tipsHtml}</ul>
                </div>
            </div>` : ''}
            ${factsHtml ? `
            <div class="dna-row dna-row-facts">
                <div class="dna-row-icon">🤯</div>
                <div class="dna-row-content">
                    <div class="dna-row-label">你知道吗？</div>
                    <ul class="dna-facts-list">${factsHtml}</ul>
                </div>
            </div>` : ''}
        `;
    }

    function showError(title, detail) {
        haptic([20, 30, 20]);
        errorTitle.textContent = title || '识别失败';
        errorDetail.textContent = detail || '请重试或换一张照片';
        showSection(errorSection);
    }

    // ============================================
    // 重置
    // ============================================
    function resetAll() {
        haptic(10);
        resetUpload();
        showSection(uploadSection);
        multiResultSection.style.display = 'none';
    }

    // 支持多物体的 "再识别一张"
    btnAgain.addEventListener('click', resetAll);
    btnErrorRetry.addEventListener('click', resetAll);
    const btnMultiAgain = $('#btnMultiAgain');
    if (btnMultiAgain) btnMultiAgain.addEventListener('click', resetAll);

    // ============================================
    // 初始化
    // ============================================
    function init() {
        showSection(uploadSection);
        initRipples();
        initGlowTracking();

        // 初始化每日挑战
        ChallengeTracker.init();

        // 初始化碳足迹
        CarbonTracker.init();

        // 初始化游戏中心
        GameCenter.init();
        TimedQuiz.init();
        MemoryMatch.init();

        // 图鉴清空按钮
        const clearBtn = $('#atlasClear');
        if (clearBtn) clearBtn.addEventListener('click', () => Atlas.clear());

        // 碳足迹折叠按钮
        const carbonToggleBtn = $('#carbonToggle');
        if (carbonToggleBtn) {
            carbonToggleBtn.addEventListener('click', () => {
                const body = $('#carbonBody');
                if (body) {
                    body.classList.toggle('carbon-body--collapsed');
                    carbonToggleBtn.classList.toggle('carbon-toggle--open');
                }
            });
        }

        fetch('/api/health')
            .then(r => r.json())
            .then(data => console.log('Backend connected:', data))
            .catch(() => {});

        // ESC 退出所有游戏界面
        document.addEventListener('keydown', (e) => {
            if (e.key === 'Escape') {
                hideAllGameScreens();
            }
        });
    }

    // 退出所有游戏界面，返回主页面
    function hideAllGameScreens() {
        // 清除所有游戏计时器
        if (TimedQuiz && TimedQuiz.timer) { clearInterval(TimedQuiz.timer); TimedQuiz.timer = null; }
        if (MemoryMatch && MemoryMatch.timer) { clearInterval(MemoryMatch.timer); MemoryMatch.timer = null; }

        $('#gameCenterOverlay').style.display = 'none';
        $('#timedQuizScreen').style.display = 'none';
        $('#memoryScreen').style.display = 'none';

        // 恢复到主页面
        showSection(uploadSection);
        haptic(6);
    }

    // ============================================
    // 每日挑战 — 融入式追踪
    // ============================================

    const CHALLENGE_KEY = 'gc_challenge_data';
    const CHALLENGE_GOAL = 10; // 每日目标分类数

    const MEDAL_DEFS = [
        { id: 'first_try', label: '首战告捷', desc: '首次完成每日挑战', icon: '🎖️', check: s => s.firstTry },
        { id: 'streak_3', label: '三日连续', desc: '连续打卡 3 天', icon: '🔥', check: s => s.streak >= 3 },
        { id: 'streak_7', label: '七日连续', desc: '连续打卡 7 天', icon: '💎', check: s => s.streak >= 7 },
        { id: 'streak_30', label: '月之星', desc: '连续打卡 30 天', icon: '🌟', check: s => s.streak >= 30 },
        { id: 'classify_50', label: '小试牛刀', desc: '累计分类 50 件', icon: '📦', check: s => s.total >= 50 },
        { id: 'classify_100', label: '分类达人', desc: '累计分类 100 件', icon: '🎯', check: s => s.total >= 100 },
        { id: 'classify_500', label: '环保先锋', desc: '累计分类 500 件', icon: '♻️', check: s => s.total >= 500 },
    ];

    const ChallengeTracker = {
        // 读取存档
        load() {
            try {
                const raw = localStorage.getItem(CHALLENGE_KEY);
                if (raw) return JSON.parse(raw);
            } catch (e) {}
            return { count: 0, date: null, streak: 0, total: 0, medals: [], completedDates: [], firstTry: false };
        },

        save(data) {
            try { localStorage.setItem(CHALLENGE_KEY, JSON.stringify(data)); } catch (e) {}
        },

        // 每次分类成功后调用
        track() {
            const data = this.load();
            const today = new Date().toISOString().split('T')[0];

            // 如果是新的一天，重置计数
            if (data.date !== today) {
                // 检查上一日是否有打卡 → 更新连续天数
                const yesterday = new Date(Date.now() - 86400000).toISOString().split('T')[0];
                if (data.date === yesterday) {
                    data.streak++;
                } else if (data.date !== today) {
                    // 断了或第一次
                    if (data.date !== null) data.streak = 0;
                }
                data.count = 0;
                data.date = today;
            }

            // 递增
            data.count++;
            data.total++;

            // 检查是否达成今日目标
            const justCompleted = data.count === CHALLENGE_GOAL;

            if (justCompleted) {
                data.firstTry = true;
                if (!data.completedDates.includes(today)) {
                    data.completedDates.push(today);
                }
                // 打卡天数 = streak + 今天
                // 但如果 steam 已含今天就不重复加
            }

            // 检查勋章
            const newMedals = MEDAL_DEFS.filter(m => m.check(data) && !data.medals.includes(m.id));
            newMedals.forEach(m => {
                if (!data.medals.includes(m.id)) data.medals.push(m.id);
            });

            this.save(data);

            // 更新入口卡片
            this.updateEntry(data);

            // 如果今日目标达成，弹庆祝
            if (justCompleted) {
                setTimeout(() => this.showCelebration(data), 300);
            }

            return { data, justCompleted, newMedals };
        },

        // 更新入口卡片的进度
        updateEntry(data) {
            const today = new Date().toISOString().split('T')[0];
            // 如果日期变了但还没分类，显示 0
            const count = (data.date === today) ? data.count : 0;
            const pct = Math.min(100, (count / CHALLENGE_GOAL) * 100);

            $('#challengeEntryDesc').textContent = `今天已分类 ${count} 件物品`;
            $('#challengeEntryPct').textContent = Math.round(pct) + '%';

            // 环形进度
            const circumference = 2 * Math.PI * 18; // r=18
            const offset = circumference * (1 - pct / 100);
            const ring = $('#challengeEntryRing');
            if (ring) ring.setAttribute('stroke-dashoffset', offset);

            // 等级
            const level = data.total >= 500 ? 5 : data.total >= 100 ? 4 : data.total >= 50 ? 3 : data.total >= 10 ? 2 : 1;
            $('#challengeEntryBadge').textContent = 'Lv.' + level;
        },

        // 显示庆祝
        showCelebration(data) {
            const section = $('#challengeResultSection');
            section.style.display = 'block';
            section.style.animation = 'none';
            void section.offsetWidth;
            section.style.animation = 'resultIn 0.6s ease-out';

            $('#challengeResultIcon').textContent = '🎉';
            $('#challengeResultTitle').textContent = '今日挑战完成！';
            $('#challengeResultSub').textContent = `已成功分类 ${CHALLENGE_GOAL} 件垃圾`;

            $('#resultCount').textContent = data.count;
            // 如果 streak 是 0 但今天完成了，至少算 1 天
            const streak = Math.max(1, data.streak);
            $('#resultStreak').textContent = streak;
            $('#resultTotal').textContent = data.total;
            $('#resultMedals').textContent = data.medals.length;

            // 新勋章
            const newMedals = MEDAL_DEFS.filter(m => m.check(data) && !data._shownMedals);
            if (newMedals.length > 0) {
                const medalsDiv = $('#challengeMedals');
                medalsDiv.style.display = 'block';
                const list = $('#medalsList');
                list.innerHTML = '';
                newMedals.forEach((m, i) => {
                    data._shownMedals = data._shownMedals || [];
                    data._shownMedals.push(m.id);
                    const div = document.createElement('div');
                    div.className = 'medal-item medal-new';
                    div.style.animationDelay = (i * 0.1) + 's';
                    div.innerHTML = `
                        <span class="medal-icon">${m.icon}</span>
                        <div class="medal-info">
                            <span class="medal-name">${m.label}</span>
                            <span class="medal-desc">${m.desc}</span>
                        </div>
                        <span class="medal-new-badge">NEW</span>
                    `;
                    list.appendChild(div);
                });
            } else {
                $('#challengeMedals').style.display = 'none';
            }

            section.scrollIntoView({ behavior: 'smooth', block: 'center' });
            haptic([15, 30, 15]);
        },

        // 初始化入口卡片
        init() {
            const data = this.load();
            this.updateEntry(data);

            // 点击卡片打开图鉴
            $('#btnChallengeDetails').addEventListener('click', () => {
                Atlas.toggle();
            });

            // 分享按钮
            $('#btnChallengeShare').addEventListener('click', () => {
                const d = this.load();
                const text =
                    `🎉 我在垃圾分类系统中完成了今日挑战！\n\n` +
                    `连续打卡: ${Math.max(1, d.streak)} 天\n` +
                    `累计分类: ${d.total} 件\n` +
                    `🏅 勋章: ${d.medals.length} 枚\n\n` +
                    `一起保护地球吧！🌱`;

                if (navigator.share) {
                    navigator.share({ title: '垃圾分类每日挑战', text }).catch(() => {});
                } else {
                    navigator.clipboard.writeText(text).then(() => haptic(10)).catch(() => {});
                }
            });
        },
    };

    // ============================================
    // 图鉴系统 (Collection Atlas)
    // ============================================
    const COLLECTION_KEY = 'gc_atlas';

    const Atlas = {
        load() {
            try {
                const raw = localStorage.getItem(COLLECTION_KEY);
                return raw ? JSON.parse(raw) : [];
            } catch(e) { return []; }
        },

        save(items) {
            try { localStorage.setItem(COLLECTION_KEY, JSON.stringify(items)); } catch(e) {}
        },

        // 每次分类后保存
        addEntry(imgEl, result) {
            let items = this.load();
            if (items.length >= 20) items = items.slice(-19);
            // 提取图片 src，一些国产浏览器对 img 元素有兼容问题
            const src = (imgEl && imgEl.src) || '';
            if (!src) return;

            items.push({
                id: Date.now(),
                image: src,
                item: result.item_zh || result.item || '未知',
                category: result.category || '其他垃圾',
                confidence: result.confidence ? (result.confidence * 100).toFixed(1) + '%' : '',
            });
            this.save(items);
        },

        // 切换图鉴显示
        toggle() {
            const section = $('#atlasSection');
            if (!section) return;
            const isOpen = section.style.display !== 'none';
            if (isOpen) {
                section.style.display = 'none';
            } else {
                this.render();
                section.style.display = 'block';
                section.scrollIntoView({ behavior: 'smooth', block: 'nearest' });
            }
        },

        render() {
            const items = this.load();
            const grid = $('#atlasGrid');
            const empty = $('#atlasEmpty');
            const count = $('#atlasCount');

            count.textContent = items.length + ' 件';

            if (!items.length) {
                grid.innerHTML = '';
                empty.style.display = 'flex';
                return;
            }
            empty.style.display = 'none';

            // 倒序显示（最新的在前）
            grid.innerHTML = [...items].reverse().map(item => {
                const catClass = item.category === '可回收垃圾' ? 'blue'
                    : item.category === '有害垃圾' ? 'red'
                    : item.category === '厨余垃圾' ? 'green'
                    : 'gray';
                return `
                    <div class="atlas-item">
                        <img src="${item.image}" alt="${item.item}" loading="lazy">
                        <div class="atlas-item-overlay">
                            <span class="atlas-item-cat" style="color: var(--color-${catClass})">${item.category}</span>
                            <span class="atlas-item-name">${item.item}</span>
                        </div>
                    </div>
                `;
            }).join('');
        },

        clear() {
            if (confirm('确定清空所有图鉴记录？')) {
                this.save([]);
                this.render();
                haptic(10);
            }
        },
    };

    // ============================================
    // 碳足迹追踪 (Carbon Footprint Tracker)
    // ============================================

    const CARBON_KEY = 'gc_carbon_data';

    const CARBON_ACHIEVEMENTS = [
        { id: 'first_step', name: '第一步', icon: '🌱', check: d => d.totalCo2 >= 0.1 },
        { id: 'kg_co2', name: '减碳 1kg', icon: '🍃', check: d => d.totalCo2 >= 1 },
        { id: 'tree_planter', name: '种树者', icon: '🌳', check: d => d.trees >= 1 },
        { id: 'co2_10', name: '减碳 10kg', icon: '🌿', check: d => d.totalCo2 >= 10 },
        { id: 'co2_50', name: '环保先锋', icon: '♻️', check: d => d.totalCo2 >= 50 },
        { id: 'co2_100', name: '碳中和小能手', icon: '🏆', check: d => d.totalCo2 >= 100 },
        { id: 'items_100', name: '分类 100件', icon: '📦', check: d => d.totalItems >= 100 },
        { id: 'items_500', name: '分类 500件', icon: '💎', check: d => d.totalItems >= 500 },
        { id: 'week_streak', name: '连续7天', icon: '🔥', check: d => d.weekStreak >= 7 },
    ];

    const CarbonTracker = {
        // 默认数据
        _defaults() {
            return {
                totalCo2: 0,
                totalTrees: 0,
                totalItems: 0,
                history: [],      // { date, co2, trees, items }
                weekly: {},       // '2026-W25': { co2, items }
                achievements: [],
                lastActiveDate: null,
                weekStreak: 0,
            };
        },

        load() {
            try {
                const raw = localStorage.getItem(CARBON_KEY);
                if (raw) {
                    const d = JSON.parse(raw);
                    // 确保所有字段存在
                    const def = this._defaults();
                    for (const k of Object.keys(def)) {
                        if (d[k] === undefined) d[k] = def[k];
                    }
                    return d;
                }
            } catch(e) {}
            return this._defaults();
        },

        save(data) {
            try {
                localStorage.setItem(CARBON_KEY, JSON.stringify(data));
            } catch(e) {}
        },

        // 单物体分类后追踪
        track(result) {
            const data = this.load();
            const today = new Date().toISOString().split('T')[0];
            const co2 = result.dna?.co2_saving_kg || 0;
            const trees = result.dna?.tree_saving || 0;

            if (co2 > 0 || trees > 0) {
                data.totalCo2 += co2;
                data.totalTrees += trees;
                data.totalItems += 1;

                data.history.push({
                    date: today,
                    co2: co2,
                    trees: trees,
                    item: result.item_zh || result.item || '未知',
                });

                // 按天聚合
                const todayEntry = data.history.filter(h => h.date === today);
                if (todayEntry.length > 0) {
                    // 已有今日记录
                }

                // 周聚合
                const weekKey = this._getWeekKey(today);
                if (!data.weekly[weekKey]) data.weekly[weekKey] = { co2: 0, items: 0 };
                data.weekly[weekKey].co2 += co2;
                data.weekly[weekKey].items += 1;

                // 连续活跃检查
                if (data.lastActiveDate !== today) {
                    const yesterday = new Date(Date.now() - 86400000).toISOString().split('T')[0];
                    if (data.lastActiveDate === yesterday) {
                        data.weekStreak = (data.weekStreak || 0) + 1;
                    } else if (data.lastActiveDate !== today) {
                        data.weekStreak = 1;
                    }
                    data.lastActiveDate = today;
                }

                this._checkAchievements(data);
                this.save(data);
                this.render(data);
            }
        },

        // 多物体分类后追踪
        trackMulti(objects) {
            if (!objects || objects.length === 0) return;
            const data = this.load();
            const today = new Date().toISOString().split('T')[0];
            const weekKey = this._getWeekKey(today);
            let totalCo2 = 0;
            let totalTrees = 0;

            objects.forEach(obj => {
                const co2 = obj.dna?.co2_saving_kg || 0;
                const trees = obj.dna?.tree_saving || 0;
                totalCo2 += co2;
                totalTrees += trees;
            });

            if (totalCo2 > 0 || totalTrees > 0) {
                data.totalCo2 += totalCo2;
                data.totalTrees += totalTrees;
                data.totalItems += objects.length;

                data.history.push({
                    date: today,
                    co2: totalCo2,
                    trees: totalTrees,
                    item: objects.map(o => o.label_zh).join(' + '),
                });

                if (!data.weekly[weekKey]) data.weekly[weekKey] = { co2: 0, items: 0 };
                data.weekly[weekKey].co2 += totalCo2;
                data.weekly[weekKey].items += objects.length;

                if (data.lastActiveDate !== today) {
                    const yesterday = new Date(Date.now() - 86400000).toISOString().split('T')[0];
                    if (data.lastActiveDate === yesterday) {
                        data.weekStreak = (data.weekStreak || 0) + 1;
                    } else if (data.lastActiveDate !== today) {
                        data.weekStreak = 1;
                    }
                    data.lastActiveDate = today;
                }

                this._checkAchievements(data);
                this.save(data);
                this.render(data);
            }
        },

        _getWeekKey(dateStr) {
            const d = new Date(dateStr + 'T00:00:00');
            const dayNum = d.getUTCDay() || 7;
            d.setUTCDate(d.getUTCDate() + 4 - dayNum);
            const yearStart = new Date(Date.UTC(d.getUTCFullYear(), 0, 1));
            const weekNo = Math.ceil((((d - yearStart) / 86400000) + 1) / 7);
            return d.getUTCFullYear() + '-W' + String(weekNo).padStart(2, '0');
        },

        _checkAchievements(data) {
            CARBON_ACHIEVEMENTS.forEach(a => {
                if (!data.achievements.includes(a.id) && a.check(data)) {
                    data.achievements.push(a.id);
                }
            });
        },

        render(data) {
            const section = $('#carbonSection');
            if (!section) return;

            if (!data || data.totalCo2 <= 0 && data.totalItems <= 0) {
                section.style.display = 'none';
                return;
            }

            section.style.display = 'block';

            // 主要指标
            $('#carbonCo2Saved').textContent = data.totalCo2.toFixed(1);
            $('#carbonTreesPlanted').textContent = data.totalTrees.toFixed(2);
            $('#carbonItemsClassified').textContent = data.totalItems || 0;

            // 等效对比（基于环保部推荐换算系数）
            const carKm = data.totalCo2 / 0.17;         // 0.17 kg CO₂/km（普通家用车）
            const bulbHours = data.totalCo2 / 0.04;     // 0.04 kg CO₂/h（60W节能灯）
            const phoneCharges = data.totalCo2 / 0.005; // 0.005 kg CO₂/次（手机充电）
            const treeDays = data.totalCo2 / 0.02;      // 0.02 kg CO₂/天（一棵树日吸收量）
            $('#equivCar').textContent = `相当于开车减少 ${carKm >= 1 ? carKm.toFixed(1) : '<1'} km`;
            $('#equivBulb').textContent = `相当于灯泡点亮 ${bulbHours >= 1 ? Math.round(bulbHours) : '<1'} 小时`;
            $('#equivCharge').textContent = `相当于手机充电 ${phoneCharges >= 1 ? Math.round(phoneCharges) : '<1'} 次`;


            // 月份趋势
            this._renderWeeklyBars(data);

            // 成就
            this._renderAchievements(data);
        },

        _renderWeeklyBars(data) {
            const container = $('#carbonBars');
            const monthlySection = $('#carbonMonthly');
            if (!container || !monthlySection) return;

            const weeks = Object.keys(data.weekly).sort().slice(-8);
            if (weeks.length < 2) {
                monthlySection.style.display = 'none';
                return;
            }
            monthlySection.style.display = 'block';

            const maxCo2 = Math.max(...weeks.map(w => data.weekly[w].co2), 0.01);

            container.innerHTML = weeks.map(w => {
                const weekData = data.weekly[w];
                const pct = (weekData.co2 / maxCo2) * 100;
                const shortLabel = w.split('-W')[1] || w.slice(-2);
                return `
                    <div class="carbon-bar" style="height:${Math.max(pct, 4)}%;background:linear-gradient(to top, #2d8a4e, #5bd68a);"
                         title="第${shortLabel}周: ${weekData.co2.toFixed(2)}kg CO₂">
                        <div class="carbon-bar-tooltip">周${shortLabel}: ${weekData.co2.toFixed(2)}kg</div>
                    </div>
                `;
            }).join('');
        },

        _renderAchievements(data) {
            const list = $('#carbonAchievementList');
            if (!list) return;

            list.innerHTML = CARBON_ACHIEVEMENTS.map(a => {
                const unlocked = data.achievements.includes(a.id);
                return `
                    <div class="carbon-achievement ${unlocked ? 'carbon-achievement--unlocked' : 'carbon-achievement--locked'}">
                        <span class="carbon-achievement-icon">${unlocked ? a.icon : '🔒'}</span>
                        <span class="carbon-achievement-name">${a.name}</span>
                    </div>
                `;
            }).join('');
        },

        init() {
            const data = this.load();
            if (data && data.totalCo2 > 0) {
                this.render(data);
            }

            // 修改 showResult 中调用 track 的行为：添加碳足迹追踪
            // 通过 monkey-patch ChallengeTracker.track 的方式已足够
            // CarbonTracker 在 track() 和 trackMulti() 中自动保存
        },
    };

    // ============================================
    // 游戏数据常量
    // ============================================

    const CATEGORIES = ['可回收垃圾', '有害垃圾', '厨余垃圾', '其他垃圾'];

    const GAME_ITEMS = [
        // 可回收垃圾
        { name_en: 'plastic bottle for drinking', name_zh: '塑料瓶', category: '可回收垃圾', emoji: '🧴' },
        { name_en: 'glass bottle for drinking', name_zh: '玻璃瓶', category: '可回收垃圾', emoji: '🥃' },
        { name_en: 'aluminum can for soda or beer', name_zh: '易拉罐', category: '可回收垃圾', emoji: '🥤' },
        { name_en: 'paper and cardboard for recycling', name_zh: '纸张', category: '可回收垃圾', emoji: '📄' },
        { name_en: 'cardboard box for packaging', name_zh: '纸箱', category: '可回收垃圾', emoji: '📦' },
        { name_en: 'newspaper and magazines', name_zh: '报纸杂志', category: '可回收垃圾', emoji: '📰' },
        { name_en: 'clothing and textiles', name_zh: '衣物', category: '可回收垃圾', emoji: '👕' },
        { name_en: 'plastic bag for shopping', name_zh: '塑料袋', category: '可回收垃圾', emoji: '🛍️' },
        { name_en: 'metal tools and hardware', name_zh: '金属制品', category: '可回收垃圾', emoji: '🔧' },
        { name_en: 'electronics and wires with circuit', name_zh: '电子产品', category: '可回收垃圾', emoji: '💻' },
        { name_en: 'wooden furniture or wood pieces', name_zh: '木材家具', category: '可回收垃圾', emoji: '🪵' },
        { name_en: 'books and notebooks for school', name_zh: '书本', category: '可回收垃圾', emoji: '📚' },
        { name_en: 'glass jar with lid', name_zh: '玻璃罐', category: '可回收垃圾', emoji: '🫙' },
        { name_en: 'iron and steel food cans', name_zh: '铁罐', category: '可回收垃圾', emoji: '🥫' },
        { name_en: 'shoes and bags made of fabric', name_zh: '鞋包', category: '可回收垃圾', emoji: '👟' },
        { name_en: 'plastic container for food storage', name_zh: '塑料容器', category: '可回收垃圾', emoji: '🥡' },
        { name_en: 'milk carton or tetra pak drink box', name_zh: '牛奶盒', category: '可回收垃圾', emoji: '🥛' },
        { name_en: 'plastic bottle cap', name_zh: '瓶盖', category: '可回收垃圾', emoji: '🔘' },
        { name_en: 'disposable wooden chopsticks pair', name_zh: '一次性筷子', category: '可回收垃圾', emoji: '🥢' },
        // 有害垃圾
        { name_en: 'battery cell for electronics', name_zh: '电池', category: '有害垃圾', emoji: '🔋' },
        { name_en: 'light bulb glass transparent', name_zh: '灯泡', category: '有害垃圾', emoji: '💡' },
        { name_en: 'medicine pills and tablets', name_zh: '药品', category: '有害垃圾', emoji: '💊' },
        { name_en: 'paint can with metal handle', name_zh: '油漆桶', category: '有害垃圾', emoji: '🎨' },
        { name_en: 'mercury thermometer glass', name_zh: '温度计', category: '有害垃圾', emoji: '🌡️' },
        { name_en: 'pesticide spray bottle', name_zh: '杀虫剂', category: '有害垃圾', emoji: '🧪' },
        { name_en: 'fluorescent tube light', name_zh: '荧光灯管', category: '有害垃圾', emoji: '💡' },
        { name_en: 'nail polish bottle small', name_zh: '化妆品', category: '有害垃圾', emoji: '💄' },
        // 厨余垃圾
        { name_en: 'food waste and leftovers on plate', name_zh: '食物残渣', category: '厨余垃圾', emoji: '🍽️' },
        { name_en: 'fruit and fruit peels organic waste', name_zh: '水果果皮', category: '厨余垃圾', emoji: '🍌' },
        { name_en: 'banana peel yellow', name_zh: '香蕉皮', category: '厨余垃圾', emoji: '🍌' },
        { name_en: 'apple core with seeds', name_zh: '苹果核', category: '厨余垃圾', emoji: '🍎' },
        { name_en: 'tea leaves and coffee grounds wet', name_zh: '茶叶咖啡渣', category: '厨余垃圾', emoji: '🫖' },
        { name_en: 'egg shell broken pieces', name_zh: '蛋壳', category: '厨余垃圾', emoji: '🥚' },
        { name_en: 'fish bones and chicken bones', name_zh: '骨头', category: '厨余垃圾', emoji: '🍗' },
        { name_en: 'leftover rice and noodles in bowl', name_zh: '剩饭剩面', category: '厨余垃圾', emoji: '🍚' },
        { name_en: 'cooked meat and bones leftovers', name_zh: '肉渣骨头', category: '厨余垃圾', emoji: '🥩' },
        // 其他垃圾
        { name_en: 'styrofoam and foam packaging white', name_zh: '泡沫塑料', category: '其他垃圾', emoji: '🧊' },
        { name_en: 'disposable face mask blue', name_zh: '口罩', category: '其他垃圾', emoji: '😷' },
        { name_en: 'tissue paper and napkins used', name_zh: '纸巾', category: '其他垃圾', emoji: '🧻' },
        { name_en: 'cigarette butt with filter', name_zh: '烟蒂', category: '其他垃圾', emoji: '🚬' },
        { name_en: 'diaper and sanitary pads', name_zh: '尿不湿', category: '其他垃圾', emoji: '👶' },
        { name_en: 'broken glass not recyclable shards', name_zh: '碎玻璃', category: '其他垃圾', emoji: '🪟' },
        { name_en: 'instant noodle cup styrofoam cup with lid', name_zh: '泡面桶', category: '其他垃圾', emoji: '🍜' },
        { name_en: 'takeout food container plastic box', name_zh: '外卖盒', category: '其他垃圾', emoji: '🥡' },
        { name_en: 'bubble tea cup with plastic lid and straw', name_zh: '奶茶杯', category: '其他垃圾', emoji: '🧋' },
        { name_en: 'plastic drinking straw', name_zh: '吸管', category: '其他垃圾', emoji: '🥤' },
        { name_en: 'wet wipes in package', name_zh: '湿巾', category: '其他垃圾', emoji: '🧻' },
        { name_en: 'cotton swab for ears', name_zh: '棉签', category: '其他垃圾', emoji: '🪥' },
        { name_en: 'bandage and adhesive tape medical', name_zh: '创可贴', category: '其他垃圾', emoji: '🩹' },
        { name_en: 'broken porcelain ceramic shards', name_zh: '碎瓷器', category: '其他垃圾', emoji: '🏺' },
        { name_en: 'disposable foam lunch box', name_zh: '泡沫饭盒', category: '其他垃圾', emoji: '📦' },
    ];

    const ITEM_FUN_FACTS = {
        "plastic bottle for drinking": "每回收 1 吨 PET 塑料瓶，可节省约 6 吨石油资源",
        "glass bottle for drinking": "玻璃可以无限次 100% 回收，质量不会下降",
        "aluminum can for soda or beer": "回收一个易拉罐节省的电量可让电视运行 3 小时",
        "paper and cardboard for recycling": "回收 1 吨废纸可造 800 公斤新纸，少砍 17 棵树",
        "cardboard box for packaging": "纸箱回收后可以做成再生纸板箱或鸡蛋托",
        "newspaper and magazines": "旧报纸回收后可以制成铅笔、鸡蛋托等新产品",
        "clothing and textiles": "旧衣物可以回收制成工业擦布、填充材料或再生纤维",
        "plastic bag for shopping": "塑料袋自然降解需要 10-1000 年",
        "metal tools and hardware": "金属可以反复回收利用，性能不会下降",
        "electronics and wires with circuit": "1 吨废旧手机含金量是 1 吨金矿的 100 倍",
        "books and notebooks for school": "旧书回收后可制成再生纸浆，用于生产包装纸",
        "glass jar with lid": "玻璃回收可减少 20% 的空气污染和 50% 的水污染",
        "milk carton or tetra pak drink box": "利乐包装可回收制成板材或再生纸",
        "plastic bottle cap": "瓶盖通常使用 HDPE 塑料，回收后可制成塑料管材",
        "battery cell for electronics": "一粒纽扣电池可污染 60 万升水",
        "light bulb glass transparent": "节能灯含汞，破碎后汞会挥发到空气中",
        "medicine pills and tablets": "过期药品属于有害垃圾，应投入红色垃圾桶",
        "paint can with metal handle": "油漆桶含有害化学物质，需专业处理",
        "nail polish bottle small": "化妆品和指甲油含有害化学物质",
        "food waste and leftovers on plate": "厨余垃圾可以堆肥转化为有机肥料",
        "fruit and fruit peels organic waste": "果皮果核是制作环保酵素的好材料",
        "banana peel yellow": "香蕉皮富含钾，可堆肥制成天然肥料",
        "tea leaves and coffee grounds wet": "茶渣咖啡渣是优质的堆肥原料，还可除臭",
        "egg shell broken pieces": "蛋壳富含钙质，磨碎后可作天然肥料",
        "fish bones and chicken bones": "骨头经粉碎后可加工成动物饲料或肥料",
        "styrofoam and foam packaging white": "泡沫塑料自然降解需要数百年",
        "disposable face mask blue": "一次性口罩的主要原料是聚丙烯，很难自然降解",
        "tissue paper and napkins used": "用过的纸巾水溶性太差，不适合回收造纸",
        "cigarette butt with filter": "烟蒂中的醋酸纤维在自然环境中需 10 年才能降解",
        "diaper and sanitary pads": "尿不湿含有高分子吸水树脂，属于其他垃圾",
        "instant noodle cup styrofoam cup with lid": "泡面桶内壁有塑料淋膜，回收难度大",
        "plastic drinking straw": "一次性吸管虽小，但回收价值低",
        "wet wipes in package": "湿巾含有化纤成分，不可冲入马桶",
        "cotton swab for ears": "棉签杆多为塑料材质，小件易被遗漏",
        "bandage and adhesive tape medical": "创可贴使用后可能沾有体液，不宜回收",
    };

    // ============================================
    // 游戏中心 (GameCenter)
    // ============================================

    const GC_KEY = 'gc_game_data';

    const GameCenter = {
        _defaults() {
            return {
                coins: 0,
                timedquiz_highest: 0,
                timedquiz_last: null,
                memory_besttime: null,
                memory_bestattempts: null,
                memory_last: null,
            };
        },

        load() {
            try {
                const raw = localStorage.getItem(GC_KEY);
                if (raw) {
                    const d = JSON.parse(raw);
                    const def = this._defaults();
                    for (const k of Object.keys(def)) { if (d[k] === undefined) d[k] = def[k]; }
                    return d;
                }
            } catch(e) {}
            return this._defaults();
        },

        save(data) {
            try { localStorage.setItem(GC_KEY, JSON.stringify(data)); } catch(e) {}
        },

        getCoins() { return this.load().coins; },

        addCoins(amount) {
            const data = this.load();
            data.coins += amount;
            this.save(data);
            this.updateCoinsDisplay();
        },

        updateCoinsDisplay() {
            const el = $('#gcCoinsDisplay');
            if (el) el.textContent = '🪙 ' + this.getCoins();
        },

        showGameCenter() {
            const data = this.load();
            // 更新高分数值
            const tqHigh = $('#gcTqHighScore');
            if (tqHigh) tqHigh.textContent = data.timedquiz_highest || '0';

            const memBest = $('#gcMemBestTime');
            if (memBest) {
                memBest.textContent = data.memory_besttime ? data.memory_besttime + 's' : '--';
            }

            this.updateCoinsDisplay();
            $('#gameCenterOverlay').style.display = 'flex';
            haptic(8);
        },

        hideGameCenter() {
            $('#gameCenterOverlay').style.display = 'none';
        },

        init() {
            // 入口卡片
            const entry = $('#gameCenterEntry');
            if (entry) {
                entry.addEventListener('click', () => this.showGameCenter());
            }

            // 返回按钮
            const backBtn = $('#gcBack');
            if (backBtn) backBtn.addEventListener('click', () => this.hideGameCenter());

            // 限时游戏入口
            const tqCard = $('#gcTimedQuiz');
            if (tqCard) tqCard.addEventListener('click', () => {
                this.hideGameCenter();
                TimedQuiz.showStart();
            });

            // 连连看入口
            const memCard = $('#gcMemoryMatch');
            if (memCard) memCard.addEventListener('click', () => {
                this.hideGameCenter();
                MemoryMatch.showStart();
            });
        },
    };

    // ============================================
    // 限时分类挑战 (TimedQuiz)
    // ============================================

    const TimedQuiz = {
        TOTAL_TIME: 60,
        ITEMS_PER_GAME: 20,
        SPEED_BONUS_TIME: 3,
        SPEED_BONUS_POINTS: 2,

        state: null,
        timer: null,

        showStart() {
            // 隐藏当前使用 section
            [uploadSection, loadingSection, resultSection, errorSection, multiResultSection].forEach(s => {
                s.style.display = 'none';
            });

            const data = GameCenter.load();
            $('#tqStartHighScore').textContent = data.timedquiz_highest || '0';

            $('#timedQuizScreen').style.display = 'flex';
            $('#tqStart').style.display = 'flex';
            $('#tqGame').style.display = 'none';
            $('#tqResult').style.display = 'none';
        },

        startGame() {
            // 准备题目: 打乱后选 ITEMS_PER_GAME 个
            const shuffled = [...GAME_ITEMS].sort(() => Math.random() - 0.5);
            const items = shuffled.slice(0, this.ITEMS_PER_GAME);

            this.state = {
                items: items,
                currentIndex: 0,
                score: 0,
                timeLeft: this.TOTAL_TIME,
                streak: 0,
                maxStreak: 0,
                answers: [],
                startTime: Date.now(),
                answered: false,
            };

            $('#tqStart').style.display = 'none';
            $('#tqGame').style.display = 'flex';
            $('#tqResult').style.display = 'none';

            this.renderHUD();
            this.showItem();
            this.resetFeedback();

            // 启动计时器
            if (this.timer) clearInterval(this.timer);
            this.timer = setInterval(() => this.tick(), 1000);
        },

        tick() {
            if (!this.state) return;
            this.state.timeLeft--;
            this.renderHUD();

            const timerEl = $('#tqTimer');
            if (timerEl) {
                timerEl.classList.toggle('tq-timer--warning', this.state.timeLeft <= 5);
            }

            if (this.state.timeLeft <= 0) {
                this.endGame();
            }
        },

        currentItem() {
            return this.state.items[this.state.currentIndex];
        },

        showItem() {
            const item = this.currentItem();
            if (!item) {
                this.endGame();
                return;
            }
            this.state.answered = false;
            $('#tqItemEmoji').textContent = item.emoji || '📦';
            $('#tqItemName').textContent = item.name_zh;

            // 重置按钮状态
            $$('.tq-btn').forEach(btn => {
                btn.classList.remove('tq-btn--correct', 'tq-btn--wrong', 'tq-btn--show-correct');
                btn.disabled = false;
                btn.style.pointerEvents = 'auto';
            });

            // 重置进度
            const pct = ((this.state.currentIndex) / this.state.items.length) * 100;
            const fill = $('#tqProgressFill');
            if (fill) fill.style.width = Math.min(pct, 100) + '%';

            // 物品入场动画
            const card = $('#tqItemCard');
            if (card) {
                card.style.animation = 'none';
                void card.offsetWidth;
                card.style.animation = 'tqItemIn 0.35s var(--ease-out)';
            }

            this.resetFeedback();
        },

        submitAnswer(category) {
            if (this.state.answered) return;
            this.state.answered = true;

            const item = this.currentItem();
            if (!item) return;

            const isCorrect = category === item.category;
            const timeElapsed = this.TOTAL_TIME - this.state.timeLeft;
            const isSpeedBonus = isCorrect && timeElapsed <= this.SPEED_BONUS_TIME;

            // 禁用所有按钮
            $$('.tq-btn').forEach(btn => {
                btn.disabled = true;
                btn.style.pointerEvents = 'none';
            });

            // 高亮正确/错误
            $$('.tq-btn').forEach(btn => {
                const btnCat = btn.dataset.category;
                if (btnCat === item.category) {
                    btn.classList.add('tq-btn--correct');
                    if (!isCorrect) btn.classList.add('tq-btn--show-correct');
                }
                if (btnCat === category && !isCorrect) {
                    btn.classList.add('tq-btn--wrong');
                }
            });

            if (isCorrect) {
                this.state.score++;
                this.state.streak++;
                if (this.state.streak > this.state.maxStreak) this.state.maxStreak = this.state.streak;
                if (isSpeedBonus) this.state.score += this.SPEED_BONUS_POINTS;

                this.showFeedback(true, item, isSpeedBonus);

                // === 仅计入 ChallengeTracker（答题不产生实际减排） ===
                ChallengeTracker.track();

                // 不向 CarbonTracker 写入虚假数据
            } else {
                this.state.streak = 0;
                this.showFeedback(false, item, false);
            }

            this.state.answers.push({ item, guess: category, correct: isCorrect, speedBonus: isSpeedBonus });
            this.renderHUD();

            // 下一题
            this.state.currentIndex++;
            if (this.state.currentIndex >= this.state.items.length) {
                setTimeout(() => this.endGame(), 1200);
            } else {
                setTimeout(() => this.showItem(), 1200);
            }
        },

        showFeedback(isCorrect, item, speedBonus) {
            const fb = $('#tqFeedback');
            if (!fb) return;
            fb.style.display = 'flex';

            if (isCorrect) {
                $('#tqFeedbackIcon').textContent = speedBonus ? '⚡' : '✅';
                $('#tqFeedbackText').textContent = speedBonus ? `正确! +${1 + this.SPEED_BONUS_POINTS} 分 (速度奖励!)` : '正确! +1 分';

                const fact = ITEM_FUN_FACTS[item.name_en];
                $('#tqFeedbackSub').textContent = fact || `${item.name_zh} → ${item.category}`;
            } else {
                $('#tqFeedbackIcon').textContent = '❌';
                $('#tqFeedbackText').textContent = `错了! 正确答案是: ${item.category}`;
                $('#tqFeedbackSub').textContent = ITEM_FUN_FACTS[item.name_en] || '';
            }
        },

        resetFeedback() {
            const fb = $('#tqFeedback');
            if (fb) fb.style.display = 'none';
        },

        renderHUD() {
            const timerEl = $('#tqTimer');
            if (timerEl) timerEl.textContent = Math.max(0, this.state.timeLeft);

            const scoreEl = $('#tqScore');
            if (scoreEl) scoreEl.textContent = this.state.score;

            const streakEl = $('#tqStreak');
            if (streakEl) streakEl.textContent = '🔥 ' + this.state.streak;
        },

        endGame() {
            if (this.timer) { clearInterval(this.timer); this.timer = null; }

            if (!this.state || !this.state.answers) return;

            const total = this.state.answers.length;
            const correctCount = this.state.answers.filter(a => a.correct).length;
            const accuracy = total > 0 ? Math.round((correctCount / total) * 100) : 0;
            const score = this.state.score;
            const maxStreak = this.state.maxStreak;

            // 检查最高分
            const data = GameCenter.load();
            const isNewRecord = score > (data.timedquiz_highest || 0);
            if (isNewRecord) {
                data.timedquiz_highest = score;
            }

            // 游戏币: 答对×2 + 最高连击≥5 +10 + 新纪录+15
            let coins = correctCount * 2;
            if (maxStreak >= 5) coins += 10;
            if (isNewRecord) coins += 15;
            data.timedquiz_last = { score, accuracy, maxStreak, correctCount, total, date: new Date().toISOString() };
            GameCenter.addCoins(coins);

            // 显示结果
            $('#tqGame').style.display = 'none';
            $('#tqResult').style.display = 'flex';

            if (score >= 30) $('#tqResultIcon').textContent = '🏆';
            else if (score >= 20) $('#tqResultIcon').textContent = '🎉';
            else if (score >= 10) $('#tqResultIcon').textContent = '👍';
            else $('#tqResultIcon').textContent = '💪';

            $('#tqResultTitle').textContent = isNewRecord ? '新纪录! 太棒了!' : '挑战完成!';
            $('#tqResultScore').textContent = score + ' 分';
            $('#tqResultNewRecord').style.display = isNewRecord ? 'block' : 'none';
            $('#tqStatCorrect').textContent = correctCount;
            $('#tqStatTotal').textContent = total;
            $('#tqStatAccuracy').textContent = accuracy + '%';
            $('#tqStatStreak').textContent = maxStreak;
            $('#tqCoinsEarned').textContent = coins;

            haptic([10, 30, 10]);
        },

        init() {
            // 开始按钮
            const startBtn = $('#tqStartBtn');
            if (startBtn) startBtn.addEventListener('click', () => this.startGame());

            // 分类按钮
            $$('.tq-btn').forEach(btn => {
                btn.addEventListener('click', () => {
                    const cat = btn.dataset.category;
                    if (cat) this.submitAnswer(cat);
                });
            });

            // 返回按钮
            const backBtns = ['tqBack', 'tqResultBack'];
            backBtns.forEach(id => {
                const el = $(`#${id}`);
                if (el) el.addEventListener('click', () => {
                    if (this.timer) { clearInterval(this.timer); this.timer = null; }
                    $('#timedQuizScreen').style.display = 'none';
                    GameCenter.showGameCenter();
                });
            });

            // 再来一次 / 返回
            const playAgain = $('#tqPlayAgain');
            if (playAgain) playAgain.addEventListener('click', () => this.showStart());

            const toGC = $('#tqToGameCenter');
            if (toGC) toGC.addEventListener('click', () => {
                $('#timedQuizScreen').style.display = 'none';
                GameCenter.showGameCenter();
            });

            // 游戏内退出按钮
            const tqGameClose = $('#tqGameClose');
            if (tqGameClose) tqGameClose.addEventListener('click', () => {
                if (this.timer) { clearInterval(this.timer); this.timer = null; }
                $('#timedQuizScreen').style.display = 'none';
                GameCenter.showGameCenter();
            });
        },
    };

    // ============================================
    // 垃圾分类连连看 (MemoryMatch)
    // ============================================

    const MemoryMatch = {
        PAIRS_COUNT: 8,
        COLS: 4,

        state: null,
        timer: null,

        showStart() {
            [uploadSection, loadingSection, resultSection, errorSection, multiResultSection].forEach(s => {
                s.style.display = 'none';
            });

            const data = GameCenter.load();
            const recordEl = $('#memStartRecord');
            if (recordEl) {
                if (data.memory_besttime) {
                    recordEl.innerHTML = `最佳纪录: <span>${data.memory_besttime}s</span> (${data.memory_bestattempts || '?'} 次尝试)`;
                } else {
                    recordEl.textContent = '来创造你的最佳纪录吧!';
                }
            }

            $('#memoryScreen').style.display = 'flex';
            $('#memStart').style.display = 'flex';
            $('#memGame').style.display = 'none';
            $('#memResult').style.display = 'none';
        },

        startGame() {
            // 选取 8 对物品
            const shuffled = [...GAME_ITEMS].sort(() => Math.random() - 0.5);
            const selected = shuffled.slice(0, this.PAIRS_COUNT);
            const emojis = ['♻️', '☣️', '🍚', '🗑️', '📦', '🔋', '🥤', '🧴', '💊', '👕', '📄', '🔧', '🥫', '🧻', '🥢', '💄'];

            const catIcons = { '可回收垃圾': '♻️', '有害垃圾': '☣️', '厨余垃圾': '🍚', '其他垃圾': '🗑️' };

            // 创建卡牌: 每对 = 1 张物品卡 + 1 张类别卡
            const cards = [];
            selected.forEach((item, idx) => {
                // 物品卡
                cards.push({
                    id: idx * 2,
                    pairId: idx,
                    type: 'item',
                    name_zh: item.name_zh,
                    emoji: item.emoji || '📦',
                    category: item.category,
                });
                // 类别卡
                cards.push({
                    id: idx * 2 + 1,
                    pairId: idx,
                    type: 'category',
                    name_zh: item.category,
                    emoji: catIcons[item.category] || '🗑️',
                    category: item.category,
                });
            });

            // 洗牌
            cards.sort(() => Math.random() - 0.5);

            this.state = {
                cards: cards,
                flipped: [],
                matched: new Set(),
                attempts: 0,
                matchCount: 0,
                startTime: Date.now(),
                isLocked: false,
            };

            $('#memStart').style.display = 'none';
            $('#memGame').style.display = 'flex';
            $('#memResult').style.display = 'none';

            this.renderGrid();
            this.updateHUD();

            // 计时器
            if (this.timer) clearInterval(this.timer);
            this.timer = setInterval(() => this.updateTimer(), 1000);
        },

        renderGrid() {
            const grid = $('#memGrid');
            if (!grid) return;

            grid.innerHTML = this.state.cards.map((card, index) => {
                return `
                    <div class="memory-card" data-index="${index}" data-ripple>
                        <div class="memory-card-inner">
                            <div class="memory-card-front"></div>
                            <div class="memory-card-back">
                                ${card.type === 'item' ? `
                                    <div class="mem-card-item">${card.emoji}</div>
                                    <div class="mem-card-name">${card.name_zh}</div>
                                ` : `
                                    <div class="mem-card-category-icon">${card.emoji}</div>
                                    <div class="mem-card-category-name">${card.name_zh}</div>
                                `}
                            </div>
                        </div>
                    </div>
                `;
            }).join('');

            // 绑定点击事件
            grid.querySelectorAll('.memory-card').forEach(el => {
                el.addEventListener('click', () => {
                    const index = parseInt(el.dataset.index);
                    this.flipCard(index);
                });
            });
        },

        flipCard(index) {
            if (this.state.isLocked) return;
            const card = this.state.cards[index];
            if (!card) return;
            if (this.state.flipped.includes(index)) return;
            if (this.state.matched.has(card.pairId)) return;

            this.state.flipped.push(index);
            const cardEl = document.querySelector(`.memory-card[data-index="${index}"]`);
            if (cardEl) cardEl.classList.add('memory-card--flipped');
            haptic(4);

            if (this.state.flipped.length === 2) {
                this.state.attempts++;
                this.updateHUD();
                this.checkMatch();
            }
        },

        checkMatch() {
            this.state.isLocked = true;
            const [i1, i2] = this.state.flipped;
            const c1 = this.state.cards[i1];
            const c2 = this.state.cards[i2];

            if (c1.pairId === c2.pairId) {
                // 匹配成功!
                this.state.matched.add(c1.pairId);
                this.state.matchCount++;

                const el1 = document.querySelector(`.memory-card[data-index="${i1}"]`);
                const el2 = document.querySelector(`.memory-card[data-index="${i2}"]`);
                if (el1) el1.classList.add('memory-card--matched');
                if (el2) el2.classList.add('memory-card--matched');

                this.state.flipped = [];
                this.state.isLocked = false;

                // 集成
                ChallengeTracker.track();

                this.updateHUD();
                haptic([8, 8, 8]);

                if (this.state.matchCount >= this.PAIRS_COUNT) {
                    setTimeout(() => this.endGame(), 600);
                }
            } else {
                // 不匹配
                setTimeout(() => {
                    const el1 = document.querySelector(`.memory-card[data-index="${i1}"]`);
                    const el2 = document.querySelector(`.memory-card[data-index="${i2}"]`);
                    if (el1) el1.classList.remove('memory-card--flipped');
                    if (el2) el2.classList.remove('memory-card--flipped');
                    this.state.flipped = [];
                    this.state.isLocked = false;
                    haptic(6);
                }, 900);
            }
        },

        updateHUD() {
            const attempts = $('#memAttempts');
            if (attempts) attempts.textContent = this.state.attempts;

            const matches = $('#memMatches');
            if (matches) matches.textContent = this.state.matchCount + '/' + this.PAIRS_COUNT;
        },

        updateTimer() {
            if (!this.state) return;
            const elapsed = Math.floor((Date.now() - this.state.startTime) / 1000);
            const timerEl = $('#memTimer');
            if (timerEl) timerEl.textContent = elapsed + 's';
        },

        endGame() {
            if (this.timer) { clearInterval(this.timer); this.timer = null; }

            const elapsed = Math.floor((Date.now() - this.state.startTime) / 1000);
            const data = GameCenter.load();

            const isNewTime = !data.memory_besttime || elapsed < data.memory_besttime;
            const isNewAttempts = !data.memory_bestattempts || this.state.attempts < data.memory_bestattempts;

            if (isNewTime) data.memory_besttime = elapsed;
            if (isNewAttempts) data.memory_bestattempts = this.state.attempts;
            data.memory_last = { elapsed, attempts: this.state.attempts, date: new Date().toISOString() };
            GameCenter.save(data);

            $('#memGame').style.display = 'none';
            $('#memResult').style.display = 'flex';

            $('#memResultNewRecord').style.display = (isNewTime || isNewAttempts) ? 'block' : 'none';
            $('#memResultAttempts').textContent = this.state.attempts + ' 次';
            $('#memResultTime').textContent = elapsed + 's';

            GameCenter.addCoins(this.state.attempts <= 12 ? 15 : 8);
            haptic([10, 30, 10]);
        },

        init() {
            const startBtn = $('#memStartBtn');
            if (startBtn) startBtn.addEventListener('click', () => this.startGame());

            const backBtns = ['memBack', 'memResultBack'];
            backBtns.forEach(id => {
                const el = $(`#${id}`);
                if (el) el.addEventListener('click', () => {
                    if (this.timer) { clearInterval(this.timer); this.timer = null; }
                    $('#memoryScreen').style.display = 'none';
                    GameCenter.showGameCenter();
                });
            });

            const playAgain = $('#memPlayAgain');
            if (playAgain) playAgain.addEventListener('click', () => this.showStart());

            const toGC = $('#memToGameCenter');
            if (toGC) toGC.addEventListener('click', () => {
                $('#memoryScreen').style.display = 'none';
                GameCenter.showGameCenter();
            });

            // 游戏内退出按钮
            const memGameClose = $('#memGameClose');
            if (memGameClose) memGameClose.addEventListener('click', () => {
                if (this.timer) { clearInterval(this.timer); this.timer = null; }
                $('#memoryScreen').style.display = 'none';
                GameCenter.showGameCenter();
            });
        },
    };

    if (document.readyState === 'complete') {
        init();
    } else {
        document.addEventListener('DOMContentLoaded', init);
    }

})();