/* ═════ 巨子测肤 H5 — 交互逻辑 ═════ */
(function () {
  'use strict';

  var $ = function (sel, root) { return (root || document).querySelector(sel); };

  // The PSD geometry uses the same 375 × 812 coordinate space as the capture mask.
  (window.CameraGeometry || []).forEach(function (geometry, index) {
    document.querySelectorAll('#cam-mask path[data-shape="' + index + '"]').forEach(function (path) {
      path.setAttribute('d', geometry.outline);
    });
    var group = document.createElementNS('http://www.w3.org/2000/svg', 'g');
    group.setAttribute('data-shape', index);
    group.setAttribute('class', 'cam-feature-lines');
    geometry.guides.forEach(function (d) {
      var path = document.createElementNS('http://www.w3.org/2000/svg', 'path');
      path.setAttribute('d', d);
      group.appendChild(path);
    });
    $('#cam-mask').appendChild(group);
  });

  /* ─── Toast ─── */
  var toastEl = $('#toast'), toastTimer = null;
  function toast(msg) {
    toastEl.textContent = msg;
    toastEl.classList.add('show');
    clearTimeout(toastTimer);
    // 长文案(如检测失败原因)按字数延长停留,短提示仍 1.8s
    toastTimer = setTimeout(function () { toastEl.classList.remove('show'); }, Math.max(1800, String(msg).length * 130));
  }

  /* ─── 屏幕管理:页面内不放返回按钮,前进时 pushState,微信/浏览器返回键经 popstate 回到上一屏 ─── */
  var currentScreen = 's-login';
  function showScreen(id, nav) { // nav: 'push' 新增历史 | 'replace' 替换当前历史 | 缺省不动历史
    if (id !== 's-login' && !AccountClient.user() && !(/[?&]mock=1/.test(location.search))) id = 's-login';
    document.querySelectorAll('.screen').forEach(function (s) {
      s.classList.toggle('active', s.id === id);
    });
    var sc = document.getElementById(id);
    window.scrollTo(0, 0);
    document.body.scrollTop = 0;
    sc.scrollTop = 0;
    currentScreen = id;
    if (id === 's-report') resetReport(); // 每次进入报告页都还原初始状态
    if (nav === 'push') history.pushState({ screen: id }, '');
    else if (nav === 'replace') history.replaceState({ screen: id }, '');
  }
  // 代码里已切好屏、只需把历史栈退一格(如拍照失败回档案页):紧随的 popstate 不再切屏
  var popSilentUntil = 0;
  function popHistorySilently() { popSilentUntil = Date.now() + 1000; history.back(); }
  window.addEventListener('popstate', function (e) {
    if (Date.now() < popSilentUntil) { popSilentUntil = 0; return; }
    var to = (e.state && e.state.screen) || 's-splash';
    ['p-privacy', 'p-photoguide', 'p-policy', 'p-zoom'].forEach(closeOverlay);
    if (currentScreen === 's-cam') leaveCamera();
    if (to === 's-cam') { to = 's-profile'; history.replaceState({ screen: to }, ''); } // 「前进」回拍照页不自动开相机
    if (to !== currentScreen) showScreen(to);
  });

  /* ─── 报告页状态重置(各维度卡回到第一个子 Tab、产品横滑归零) ─── */
  function setDetailTab(card, idx) {
    card.querySelectorAll('.dtab').forEach(function (t) { t.classList.toggle('active', t.dataset.tab === idx); });
    card.querySelectorAll('.dpanel').forEach(function (p) { p.classList.toggle('active', p.dataset.panel === idx); });
  }
  function resetReport() {
    document.querySelectorAll('.card-detail').forEach(function (c) { setDetailTab(c, '0'); });
    var ps = $('#prod-scroll');
    if (ps) ps.scrollLeft = 0;
  }

  /* ─── 弹窗管理 ─── */
  function openOverlay(id)  { $('#' + id).classList.add('show'); }
  function closeOverlay(id) { $('#' + id).classList.remove('show'); }

  // 点遮罩空白处关闭(与各自关闭按钮同行为:隐私→回启动页、拍照引导→留在档案页)
  // 只响应遮罩本身(拍照引导另含底图层),不误伤弹窗卡片内交互
  function bindBackdropClose(id) {
    var ov = $('#' + id);
    ov.addEventListener('click', function (e) {
      if (e.target === ov || e.target.closest('.guide-bg')) closeOverlay(id);
    });
  }
  bindBackdropClose('p-privacy');
  bindBackdropClose('p-photoguide');
  bindBackdropClose('p-policy');
  // ESC 关闭(分析中过渡不响应;放大图/协议层在最上,优先关)
  document.addEventListener('keydown', function (e) {
    if (e.key !== 'Escape' && e.key !== 'Esc') return;
    var order = ['p-zoom', 'p-policy', 'p-privacy', 'p-photoguide'];
    for (var i = 0; i < order.length; i++) {
      if ($('#' + order[i]).classList.contains('show')) { closeOverlay(order[i]); return; }
    }
  });

  // 退出拍照流程:作废未决快门/分析回调、掐断播报、释放摄像头
  function leaveCamera() {
    camSeq++;
    voice.stop(true);
    closeOverlay('p-analyzing');
    stopCamera();
    shutterLock = false;
  }
  // 分析中弹层点遮罩取消:回档案页(mock 路径同样经 seq 丢弃)
  $('#p-analyzing').addEventListener('click', function (e) {
    if (e.target !== this) return; // 只响应遮罩空白处,不误伤卡片
    leaveCamera();
    showScreen('s-profile');
    popHistorySilently();
  });

  /* ─── 肤质轮播 ─── */
  var SKINS = [
    { img: 'assets/img/ui-20261009/skin-0-dry.png',       name: '干性肌肤',     desc: '全脸干燥，容易紧绷、<br>缺乏光泽' },
    { img: 'assets/img/ui-20261009/skin-1-mixeddry.png',  name: '混合偏干肌肤', desc: '两颊偏干，T区油脂较少或偶尔出油' },
    { img: 'assets/img/ui-20261009/skin-2-neutral.png',   name: '中性肌肤',     desc: '水油平衡，肤感舒适，无明显干燥出油' },
    { img: 'assets/img/ui-20261009/skin-3-oily.png',      name: '油性肌肤',     desc: '全脸易出油，容易泛油光、毛孔明显' },
    { img: 'assets/img/ui-20261009/skin-4-mixedoily.png', name: '混合偏油肌肤', desc: 'T区易出油，两颊相对清爽或轻微干燥' }
  ];
  var skinIndex = 0;
  var track = $('#skin-track'), dotsBox = $('#skin-dots');

  SKINS.forEach(function (s, i) {
    var item = document.createElement('div');
    item.className = 'skin-item';
    item.innerHTML =
      '<img src="' + s.img + '"' + (i === 0 ? '' : ' loading="lazy"') + ' alt="' + s.name + '">' +
      '<span class="skin-name">' + s.name + '</span>' +
      '<p class="skin-desc">' + s.desc + '</p>';
    track.appendChild(item);
    var dot = document.createElement('i');
    if (i === 0) dot.className = 'on';
    dot.addEventListener('click', function () { goSkin(i); });
    dotsBox.appendChild(dot);
  });

  function goSkin(i) {
    skinIndex = Math.max(0, Math.min(SKINS.length - 1, i));
    track.style.transform = 'translateX(-' + skinIndex * 100 + '%)';
    dotsBox.querySelectorAll('i').forEach(function (d, k) {
      d.classList.toggle('on', k === skinIndex);
    });
    $('.skin-arrow.prev').disabled = skinIndex === 0;
    $('.skin-arrow.next').disabled = skinIndex === SKINS.length - 1;
  }
  document.querySelectorAll('[data-skin-step]').forEach(function (b) {
    b.addEventListener('click', function () { goSkin(skinIndex + (+b.dataset.skinStep)); });
  });
  goSkin(0);

  // 拖拽切换(Pointer Events 统一鼠标 + 触摸)
  var drag = { id: null, startX: 0, startY: 0, horizontal: false, suppress: false };
  var carousel = $('#skin-carousel');
  carousel.addEventListener('pointerdown', function (e) {
    if (e.cancelable) e.preventDefault(); // 阻止原生图片拖拽/文字选中引发 pointercancel(click 仍会正常触发)
    try { carousel.setPointerCapture(e.pointerId); } catch (err) { /* 非活动指针时忽略,退化为普通监听 */ }
    // 捕获指针:斜拖出卡片、卡外松手也能收到 pointerup
    drag.id = e.pointerId;
    drag.startX = e.clientX;
    drag.startY = e.clientY;
    drag.horizontal = false;
    drag.suppress = false;
  });
  carousel.addEventListener('pointermove', function (e) {
    if (e.pointerId !== drag.id) return;
    var dx = e.clientX - drag.startX, dy = e.clientY - drag.startY;
    // 横向位移明显大于纵向时才判定为拖拽,避免吞掉纵向滚动
    if (!drag.horizontal && Math.abs(dx) > 8 && Math.abs(dx) > Math.abs(dy)) drag.horizontal = true;
    if (drag.horizontal && e.cancelable) e.preventDefault();
  });
  carousel.addEventListener('pointerup', function (e) {
    if (e.pointerId !== drag.id) return;
    var dx = e.clientX - drag.startX;
    if (drag.horizontal) {
      if (Math.abs(dx) > 30) goSkin(skinIndex + (dx < 0 ? 1 : -1));
      drag.suppress = true; // 拖拽后吞掉紧随的 click,防止点击穿透
    }
    drag.id = null;
    drag.horizontal = false;
  });
  carousel.addEventListener('pointercancel', function (e) {
    if (e.pointerId !== drag.id) return; // 其它指针的 cancel 不打断当前拖拽
    drag.id = null; // 拖拽被系统取消(滚轮/新指针等):干净结束,不残留状态
    drag.horizontal = false;
  });
  carousel.addEventListener('click', function (e) {
    if (drag.suppress) { e.preventDefault(); e.stopPropagation(); drag.suppress = false; }
  }, true);

  /* ─── 档案选择控件:出生年月 / 性别 / 省份城市,统一用 mobile-select 底部滚轮(选中值写入同名 hidden input) ─── */
  var NOW = new Date(), NOW_Y = NOW.getFullYear(), NOW_M = NOW.getMonth() + 1;
  var YEARS = [], MONTHS = [];
  for (var yy = NOW_Y - 99; yy <= NOW_Y - 1; yy++) YEARS.push(yy + '年');
  for (var mm = 1; mm <= 12; mm++) MONTHS.push(mm + '月');
  var regionSel = $('#f-region');
  function setPick(sel, text) { $(sel + ' .pick-value').textContent = text; }
  function ageFromBirth(y, m) { return NOW_Y - y - (NOW_M < m ? 1 : 0); } // 未过生日月份按少一岁
  function makePicker(trigger, opts) {
    if (typeof MobileSelect === 'undefined') return null;
    return new MobileSelect(Object.assign({
      trigger: trigger, triggerDisplayValue: false,
      ensureBtnText: '确定', cancelBtnText: '取消'
    }, opts));
  }
  makePicker('#pick-birth', {
    title: '出生年月',
    wheels: [{ data: YEARS }, { data: MONTHS }],
    position: [YEARS.indexOf((NOW_Y - 30) + '年'), 0],
    onChange: function (val) {
      var y = parseInt(val[0], 10), m = parseInt(val[1], 10);
      $('#f-birth').value = y + '-' + (m < 10 ? '0' : '') + m;
      $('#f-age').value = ageFromBirth(y, m);
      setPick('#pick-birth', y + '年' + m + '月');
    }
  });
  makePicker('#pick-gender', {
    title: '性别',
    wheels: [{ data: ['女', '男'] }],
    onChange: function (val) { $('#f-gender').value = val[0]; setPick('#pick-gender', val[0]); }
  });
  makePicker('#pick-region', {
    title: '所在地区',
    wheels: [{ data: (window.REGION_DATA || []).map(function (p) {
      return { id: p[0], value: p[0], childs: p[1].map(function (c) { return { id: c, value: c }; }) };
    }) }],
    onChange: function (val) {
      var prov = val[0] && val[0].value, city = val[1] && val[1].value;
      var text = !city || city === prov ? prov : prov + ' ' + city; // 直辖市/港澳台只显示一级
      regionSel.value = text;
      setPick('#pick-region', text);
    }
  });

  /* ─── 实时相机(getUserMedia)+ 系统相机降级 ─── */
  var IS_MOCK = /[?&]mock=1/.test(location.search); // mock:不加载 face-api、不跑检测,analyze 直返内置样本
  var camVideo = $('#cam-video'), camFile = $('#cam-file'), albumFile = $('#album-file');
  var camStream = null, camLive = false, camFallback = false, camSeqCam = 0; // camSeqCam:相机启动令牌,防止迟到的授权回调泄漏摄像头
  var photos = []; // 三连拍(dataURL),拍摄中与 CAM_STEPS 同序;送检前经 photosByView 重排为 [正脸, 左脸, 右脸]

  // 约束逐级放宽:facingMode 裸值在部分 Android 抛 OverconstrainedError,先 ideal 再退 video:true,最后才降级
  var camFacing = 'user';        // 当前镜头:'user' 前置 | 'environment' 后置(翻转按钮切换)
  var camMirrored = true;        // 预览镜像:前置 true(照镜子习惯,Figma 侧脸轮廓即按镜像画面绘制),后置 false
  var sideYawFlip = false;       // 侧脸步语义 yaw 反向标志:个别机型前置帧本身已镜像时由自校准翻转
  var mirrorCalibrated = false;  // 侧脸自校准:本轮是否已翻转过一次(防振荡,一次校准管整个会话)
  var oppFrames = 0;             // 侧脸步语义 yaw 连续反向帧计数
  // 预览是否镜像(仅预览;抓帧恒为原始视角)。后置不镜像时侧脸轮廓需水平翻转,才与画面中的脸朝向一致
  function effMirror() { return camMirrored; }
  function applyMirror() {
    camVideo.classList.toggle('mirror', effMirror());
    $('#cam-mask').classList.toggle('flip', !effMirror() && CAM_STEPS[camStep].target !== 'front');
  }
  function getCamStream() {
    return navigator.mediaDevices.getUserMedia({
      video: { facingMode: { ideal: camFacing }, width: { ideal: 1280 }, height: { ideal: 1280 } },
      audio: false
    }).catch(function (err) {
      if (err && err.name === 'OverconstrainedError') {
        return navigator.mediaDevices.getUserMedia({ video: true, audio: false });
      }
      throw err;
    });
  }
  // 相机预热:部分设备开头 1~2s 以低分辨率出画(画面显脸巨大),等分辨率稳定两拍再放开取景与检测
  function waitVideoStable(done) {
    var lastW = 0, stableN = 0, tries = 0;
    var t = setInterval(function () {
      var w = camVideo.videoWidth;
      tries++;
      if (w && w === lastW) {
        if (++stableN >= 2) { clearInterval(t); done(); }
      } else { stableN = 0; lastW = w; }
      if (tries > 40) { clearInterval(t); done(); } // 12s 兜底,异常也不卡死
    }, 300);
  }
  function startCamera() {
    if (camStream) { stopCamera(); }
    camFallback = false;
    if (!navigator.mediaDevices || !navigator.mediaDevices.getUserMedia) { enableFallback(); return; }
    camSeqCam++;
    var token = camSeqCam;
    getCamStream().then(function (stream) {
      if (token !== camSeqCam) { stream.getTracks().forEach(function (t) { t.stop(); }); return; } // 期间已退出拍照页:立即释放
      camStream = stream;
      camVideo.srcObject = stream;
      applyMirror();
      // iOS 来电/切后台等系统打断会结束 track:挂 ended 监听走自动重连
      stream.getTracks().forEach(function (t) {
        t.onended = function () { onCamTrackEnded(token); };
      });
      waitVideoStable(function () { // 预热完成前不出实时画面(静态示意底图还在),避免开头"大脸"闪变
        if (token !== camSeqCam) return;
        camLive = true;
        $('#s-cam').classList.add('cam-live');
        beginDetect();      // 确认相机可用后才加载检测模型(无相机权限设备不白加载)
        maybeStartDetect(); // 模型已就绪时即刻开跑检测循环
      });
    }).catch(function () {
      if (token !== camSeqCam) return;
      enableFallback();
    });
  }
  // track 被系统结束(iOS 打断)且页面仍在拍照前台:toast 后自动重连,重连失败走 startCamera 内的 enableFallback
  function onCamTrackEnded(token) {
    if (token !== camSeqCam || !camLive) return; // 旧流/已主动停止:忽略
    if (document.hidden || currentScreen !== 's-cam') return; // 后台恢复由 visibilitychange 流程接管
    camLive = false; // 多个 track 同时 ended 只触发一次重连
    toast('摄像头连接中断,正在重连');
    startCamera();
  }
  function stopCamera() {
    camSeqCam++; // 使进行中的 getUserMedia 回调失效
    stopDetect(); // 检测循环/无进展提示一并收尾
    $('#cam-status').classList.remove('show');
    if (camStream) { camStream.getTracks().forEach(function (t) { t.stop(); }); camStream = null; }
    camVideo.srcObject = null;
    camLive = false;
    $('#s-cam').classList.remove('cam-live');
    $('#cam-mask').classList.remove('scanning');
  }
  function enableFallback() {
    camFallback = true;
    $('#cam-status').classList.remove('show'); // 与 stopCamera 对齐:去掉「检测引擎加载中」胶囊
    resetDetectState(); // 降级无检测、无补光:蒙版回到静态线框,快门出现
    toast('已切换为系统相机拍摄');
    // 系统相机拍回的照片也要校验(有脸、角度对),模型照常预加载
    if (!IS_MOCK && typeof faceapi !== 'undefined') loadModels().catch(function () {});
  }
  // 从视频帧截取照片(完整帧、摄像头原始视角,压到最长边 1280 的 JPEG)
  // 抓完整帧而非取景框可见区:新 UI 轮廓外全黑,用户只关注轮廓内人脸;按可见区裁切在侧脸/偏站位时会切掉人脸(Face++ INVALID_IMAGE_FACE)
  // 正脸步预览虽镜像,照片不镜像:Face++ 的左右分区(左嘴角纹/左右脸颊等)按真实左右出文案,且与两张侧脸及真值样本同口径
  function captureFromVideo() {
    var vw = camVideo.videoWidth, vh = camVideo.videoHeight;
    if (!vw || !vh) return null;
    var scale = Math.min(1, 1280 / Math.max(vw, vh));
    var cw = Math.round(vw * scale), ch = Math.round(vh * scale);
    var canvas = document.createElement('canvas');
    canvas.width = cw; canvas.height = ch;
    var ctx = canvas.getContext('2d');
    ctx.drawImage(camVideo, 0, 0, vw, vh, 0, 0, cw, ch);
    return canvas.toDataURL('image/jpeg', 0.88);
  }
  // 文件 → 统一压成最长边 1280 的 JPEG → 校验合格才推进流程(降级系统相机与相册选图共用)
  function readPhotoFile(f) {
    if (!f) return;
    var step = camStep, seq = camSeq;
    var reader = new FileReader();
    reader.onload = function () {
      var img = new Image();
      img.onload = function () {
        var scale = Math.min(1, 1280 / Math.max(img.width, img.height));
        var c = document.createElement('canvas');
        c.width = Math.round(img.width * scale); c.height = Math.round(img.height * scale);
        c.getContext('2d').drawImage(img, 0, 0, c.width, c.height);
        var url = c.toDataURL('image/jpeg', 0.88);
        shutterLock = true; // 校验期间不接受新的拍摄/选图
        showCamStatus('照片检查中…');
        checkStill(url, CAM_STEPS[step].target).then(function (err) {
          hideCamStatus();
          if (seq !== camSeq || step !== camStep) return; // 期间已退出/重置
          shutterLock = false;
          if (err) { toast(err); voice.play(VOICE.fail, { cut: true }); return; } // 不合格:停在本步重拍
          onPhotoCaptured(url);
        });
      };
      img.onerror = function () { toast('照片读取失败,请重新选择'); };
      img.src = reader.result;
    };
    reader.readAsDataURL(f);
  }
  // 静态照片校验:有人脸、朝向与当前步一致(检测模型不可用时放行,由服务端兜底)
  // 系统相机的前置照片是否镜像因机型而异,侧脸只校验转头幅度、不校验左右
  var STILL_FRONT_YAW_MAX = 20, STILL_SIDE_YAW_MIN = 20;
  function checkStill(dataUrl, target) {
    if (IS_MOCK || !modelsOk || typeof faceapi === 'undefined') return Promise.resolve('');
    return new Promise(function (resolve) {
      var img = new Image();
      img.onload = function () {
        faceapi
          .detectSingleFace(img, new faceapi.TinyFaceDetectorOptions({ inputSize: DETECT_INPUT_SIZE, scoreThreshold: DETECT_SCORE }))
          .withFaceLandmarks()
          .then(function (d) {
            if (!d) { resolve('照片中未识别到人脸,请重新拍摄'); return; }
            var e = null;
            try { e = HeadPose.estimate(d.landmarks.positions, false); } catch (err) { e = null; }
            if (!e) { resolve(''); return; }
            var yaw = Math.abs(e.yaw);
            if (target === 'front' && yaw > STILL_FRONT_YAW_MAX) { resolve('请拍摄正脸照片'); return; }
            if (target !== 'front' && yaw < STILL_SIDE_YAW_MIN) { resolve('请拍摄' + (target === 'right' ? '右' : '左') + '侧脸照片'); return; }
            resolve('');
          }, function () { resolve(''); });
      };
      img.onerror = function () { resolve('照片读取失败,请重新选择'); };
      img.src = dataUrl;
    });
  }
  function showCamStatus(text) { var s = $('#cam-status'); s.textContent = text; s.classList.add('show'); }
  function hideCamStatus() { $('#cam-status').classList.remove('show'); }
  // 降级模式:快门调起系统相机,拍完/选完在 change 里推进流程
  camFile.addEventListener('change', function () {
    shutterLock = false; // 选完(含空选择)即解锁;推进窗口由 onPhotoCaptured 重新上锁
    var f = camFile.files && camFile.files[0];
    camFile.value = '';
    readPhotoFile(f);
  });
  // 部分系统取消相机/相册只发 cancel 不发 change:兜底解锁,防快门卡死
  camFile.addEventListener('cancel', function () { shutterLock = false; });
  // 相册选图(相机页「相册」入口):选当前步的图片,与实拍同管线推进
  albumFile.addEventListener('change', function () {
    shutterLock = false;
    var f = albumFile.files && albumFile.files[0];
    albumFile.value = '';
    readPhotoFile(f);
  });
  albumFile.addEventListener('cancel', function () { shutterLock = false; });

  /* ─── 语音播报(WebAudio 单通道;assets/voice/<id>.mp3,缺失静默跳过;同条 4s 去重)
       文案/文件名契约:docs/语音播报内容设计文档_V1.0.md ─── */
  var VOICE = {
    step: ['step1-front', 'step2-rightface', 'step3-leftface'],
    hint: {
      '未检测到人脸': 'hint-noface', '请靠近一点': 'hint-near', '请远一点': 'hint-far',
      '请正对屏幕': 'hint-front', '请向左转头': 'hint-turn-left', '请向右转头': 'hint-turn-right',
      '保持不动': 'hint-hold'
    },
    countdown: 'countdown-321', shot: 'shot-done', analyzing: 'analyzing', fail: 'analyze-fail'
  };
  // 两类播报:流程音(步骤引导/拍摄完成/倒计时/分析中/失败)排队顺序播,互不截断;
  // 姿态提示可互相打断,但不截断流程音——流程音播放期间只挂起最新一条,收尾后补播
  var voice = (function () {
    var ctx = null, lastAt = {}, files = null; // files:null=清单未加载;{}=无可用语音
    var bufs = {};          // id → Promise<AudioBuffer|null>(解锁后预加载,弱网下首播不等下载)
    var cur = null;         // { id, kind:'flow'|'hint', token, src, end }
    var queue = [];         // 排队中的流程音
    var pendingHint = null; // 流程音期间到来的姿态提示(只留最新)
    var waiters = [];       // afterCurrent 回调:全部播报收尾后执行
    // 清单制:只播 assets/voice/manifest.json 里声明的文件,不逐个探文件(避免控制台 404 噪音)
    fetch('assets/voice/manifest.json')
      .then(function (r) { return r.ok ? r.json() : { files: [] }; })
      .then(function (m) { files = {}; (m.files || []).forEach(function (f) { files[f] = 1; }); preload(); })
      .catch(function () { files = {}; });
    function decode(ab) {
      return new Promise(function (resolve) {
        try {
          var p = ctx.decodeAudioData(ab, resolve, function () { resolve(null); });
          if (p && p.catch) p.catch(function () { resolve(null); });
        } catch (e) { resolve(null); }
      });
    }
    function load(id) {
      if (!bufs[id]) {
        bufs[id] = fetch('assets/voice/' + id + '.mp3')
          .then(function (r) { return r.ok ? r.arrayBuffer() : null; })
          .then(function (ab) { return ab ? decode(ab) : null; })
          .catch(function () { return null; })
          .then(function (buf) { if (!buf) delete bufs[id]; return buf; }); // 失败不缓存,下次再试
      }
      return bufs[id];
    }
    function preload() { if (ctx && files) Object.keys(files).forEach(load); }
    function unlock() { // iOS/微信自动播放限制:必须在用户手势里初始化并 resume
      if (!ctx) {
        try { ctx = new (window.AudioContext || window.webkitAudioContext)(); } catch (e) { ctx = null; }
        preload();
      }
      if (ctx && ctx.state === 'suspended') ctx.resume();
    }
    function stopCur() {
      if (!cur) return;
      var c = cur;
      cur = null;
      if (c.src) { c.src.onended = null; try { c.src.stop(); } catch (e) {} }
    }
    function start(id, kind) {
      stopCur();
      lastAt[id] = Date.now();
      var token = {};
      cur = { id: id, kind: kind, token: token, src: null, end: 0 };
      load(id).then(function (buf) {
        if (!cur || cur.token !== token) return; // 加载期间已被打断
        if (!buf || !ctx) { cur = null; drain(); return; }
        var src = ctx.createBufferSource();
        src.buffer = buf;
        src.connect(ctx.destination);
        cur.src = src;
        cur.end = Date.now() + buf.duration * 1000;
        src.onended = function () { if (cur && cur.token === token) { cur = null; drain(); } };
        src.start(0);
      });
    }
    function drain() {
      if (cur) return;
      if (queue.length) { start(queue.shift(), 'flow'); return; }
      if (pendingHint) { var h = pendingHint; pendingHint = null; start(h, 'hint'); return; }
      var w = waiters;
      waiters = [];
      w.forEach(function (fn) { fn(); });
    }
    function busyWithFlow() { return (cur && cur.kind === 'flow') || queue.length > 0; }
    // opts.hint:姿态提示(随检测帧反复触发,同条 4s 去重);opts.cut:打断在播与排队(失败提示不必等「分析中」播完)
    // 流程音是离散事件,每次都播(连拍的「拍摄完成」、取消后重来的倒计时)
    function play(id, opts) {
      opts = opts || {};
      if (!ctx || !id || ctx.state !== 'running' || !files || !files[id]) return;
      if (opts.hint) {
        if (lastAt[id] && Date.now() - lastAt[id] < 4000) return;
        if (busyWithFlow()) { pendingHint = id; return; }
        start(id, 'hint');
        return;
      }
      if (opts.cut) { queue = []; pendingHint = null; start(id, 'flow'); return; }
      if (busyWithFlow()) { if (queue.indexOf(id) < 0) queue.push(id); return; }
      start(id, 'flow'); // 在播的姿态提示让位给流程音
    }
    function dropHint() { pendingHint = null; } // 提示已清空/换步:挂起的旧提示作废
    // 流程切走:作废排队/挂起/等待;hard 连在播一并掐断(退出拍照、页面隐藏),否则让在播自然收尾(出报告)
    function stop(hard) {
      queue = [];
      pendingHint = null;
      waiters = [];
      if (hard) stopCur();
    }
    // 等全部播报(含排队与挂起提示)自然收尾后执行 cb(倒计时接续「保持不动」,不拦腰切断);空闲则立即执行
    function afterCurrent(cb) {
      var tail = cur && cur.src && Date.now() >= cur.end - 60; // 只剩尾音视为已收尾
      if ((!cur || tail) && !queue.length && !pendingHint) { cb(); return null; }
      var fn = function () { cb(); };
      waiters.push(fn);
      return function () { waiters = waiters.filter(function (w) { return w !== fn; }); };
    }
    return { unlock: unlock, play: play, dropHint: dropHint, afterCurrent: afterCurrent, stop: stop };
  })();
  document.addEventListener('click', voice.unlock); // 任意点击即完成解锁

  /* ─── 姿态检测(face-api + HeadPose):动态捕捉——距离/居中/角度/光线全部合格并稳住片刻即自动抓拍,不倒计时、无手动快门 ─── */
  var MODEL_URL = 'vendor/faceapi/models';
  var DETECT_INTERVAL = 150;   // 检测帧间隔(ms)
  var DETECT_INPUT_SIZE = 416; // tinyFaceDetector 输入尺寸:320 下正脸置信度仅 0.67 且框偏松,416 置信度 ~0.99 框更准(CPU 端略慢,移动端 GPU 无感)
  var DETECT_SCORE = 0.3;      // 置信度阈值:0.4 在噪声帧易漏检,0.3 配合距离/角度闸门足够抗误检
  var MISS_FRAMES_MAX = 3;     // 连续漏检 ≥3 帧(~450ms)才报「未检测到人脸」,容忍单帧抖动
  var OK_HOLD_MS = 450;        // 条件连续合格时长:滤掉一闪而过的合格帧(防运动模糊),达标立即抓拍
  var NO_PROGRESS_MS = 12000;  // 单步超过该时长仍未抓拍→浮出调整提示
  var PREVIEW_SCALE = 0.85;    // 与 CSS #cam-video 的 scale 一致:预览缩小 15%
  // 人脸框高/视频高。原标定(取景框≈42% 屏高)为 0.26/0.58;预览缩小 15% 后,同样装满轮廓需要脸在原始帧里大 1/0.85 倍
  var FACE_NEAR = 0.30, FACE_FAR = 0.68;
  var CENTER_TOL = 0.18;       // 人脸中心偏离取景中线超过屏宽 18% → 提示移入取景框
  var LUMA_DARK = 65, LUMA_BRIGHT = 235; // 脸部平均亮度(0–255):过暗/过曝提示调整光线

  var modelsPromise = null, modelsOk = false, detectDisabled = false; // detectDisabled:face-api 缺失→全程手动;模型加载失败仅当次禁用,下次进拍照页重试
  var detRunning = false, detTimer = null;   // 检测循环
  var okSince = 0;                           // 当前连续 ok 起点(0=未在累积)
  var nudgeTimer = null;                     // 12s 无进展提示
  var capturing = false;                     // 白屏补光抓帧中(暂停姿态判定)
  var lastHint = '';                         // 提示文案去重

  // 模型只加载一次(缓存 promise);失败清空缓存,下次进拍照页重试
  function loadModels() {
    if (!modelsPromise) {
      modelsPromise = Promise.all([
        faceapi.nets.tinyFaceDetector.loadFromUri(MODEL_URL),
        faceapi.nets.faceLandmark68Net.loadFromUri(MODEL_URL)
      ]).then(function () { modelsOk = true; },
              function (err) { modelsPromise = null; throw err; });
    }
    return modelsPromise;
  }

  // 扫描带裁切:复制镂空轮廓到 <clipPath id="cam-clip">,随 data-step 的 CSS 显隐一起切换
  (function buildScanClip() {
    var NS = 'http://www.w3.org/2000/svg';
    var clip = document.createElementNS(NS, 'clipPath');
    clip.id = 'cam-clip';
    document.querySelectorAll('#cam-cut [data-shape]').forEach(function (p) { clip.appendChild(p.cloneNode(false)); });
    $('#cam-mask defs').appendChild(clip);
  })();

  function setMask(cls) { // '' 静态白框 | 'no-face' 呼吸动画 | 'ok' 品牌绿定格
    var m = $('#cam-mask');
    m.classList.toggle('no-face', cls === 'no-face');
    m.classList.toggle('ok', cls === 'ok');
  }
  function setHint(text, ok, silent) {
    var h = $('#cam-hint');
    if (!text) { h.classList.remove('show', 'ok'); lastHint = ''; voice.dropHint(); return; }
    if (text !== lastHint) {
      h.textContent = text; // 同文案不重复触发布局
      if (!silent) voice.play(VOICE.hint[text], { hint: true }); // 语音同步(模块内 4s 去重)
    }
    h.classList.add('show');
    h.classList.toggle('ok', !!ok);
    lastHint = text;
  }
  function hideNudge() { $('#cam-nudge').classList.remove('show'); }

  // 手动模式(显示快门):系统相机降级 / 识别不可用 / mock 调试;其余为实时检测自动抓拍
  function isManualMode() { return IS_MOCK || camFallback || detectDisabled; }
  function syncCamMode() {
    $('#s-cam').classList.toggle('cam-manual', isManualMode());
    $('#cam-mask').classList.toggle('scanning', camLive && !isManualMode() && modelsOk);
  }

  // 每步进入/回退时的检测状态机重置(蒙版/提示/无进展计时全部归位)
  function resetDetectState() {
    okSince = 0;
    missFrames = 0;
    oppFrames = 0;
    lastHint = '';
    clearTimeout(nudgeTimer);
    hideNudge();
    setHint('');
    setMask(camLive && !isManualMode() ? 'no-face' : '');
    syncCamMode();
    armNudge();
  }
  // 单步 12s 仍未抓拍→底部浮出调整提示(不阻塞流程);进入下一步/抓帧时重置
  function armNudge() {
    clearTimeout(nudgeTimer);
    hideNudge();
    if (isManualMode()) return;
    if (currentScreen !== 's-cam') return;
    nudgeTimer = setTimeout(function () {
      if (currentScreen === 's-cam' && !shutterLock) $('#cam-nudge').classList.add('show');
    }, NO_PROGRESS_MS);
  }

  function maybeStartDetect() {
    if (detRunning || IS_MOCK || detectDisabled || !modelsOk || !camLive || currentScreen !== 's-cam') return;
    detRunning = true;
    syncCamMode();
    detTick();
  }
  function stopDetect() {
    detRunning = false;
    clearTimeout(detTimer);
    clearTimeout(nudgeTimer);
    hideNudge();
  }
  // 递归 setTimeout 而非 setInterval:检测是异步的,避免帧与帧堆叠
  function detTick() {
    if (!detRunning) return;
    detTimer = setTimeout(function () {
      if (!detRunning) return;
      detectFrame().then(detTick, detTick);
    }, DETECT_INTERVAL);
  }
  function detectFrame() {
    if (shutterLock || capturing || !camLive) return Promise.resolve(); // 抓帧/流程推进中不判姿态
    var step = camStep, seq = camSeq; // 快照:检测是异步的,帧落地时步骤/流程可能已变
    return faceapi
      .detectSingleFace(camVideo, new faceapi.TinyFaceDetectorOptions({ inputSize: DETECT_INPUT_SIZE, scoreThreshold: DETECT_SCORE }))
      .withFaceLandmarks()
      .then(function (d) {
        if (step !== camStep || seq !== camSeq) return; // 跨步骤陈帧/流程已重置:丢弃
        if (detRunning && !shutterLock && !capturing) onDetect(d);
      })
      .catch(function () { /* 单帧异常忽略,下一帧继续 */ });
  }
  // 人脸框中心相对取景中线的水平偏移(占屏宽比例);按 object-fit:cover + 预览缩放换算到屏幕,镜像只影响符号
  function faceOffsetX(box) {
    var vw = camVideo.videoWidth, vh = camVideo.videoHeight, W = camVideo.clientWidth, H = camVideo.clientHeight;
    if (!vw || !vh || !W || !H) return 0;
    var s = Math.max(W / vw, H / vh) * PREVIEW_SCALE;
    return ((box.x + box.width / 2) - vw / 2) * s / W;
  }
  // 脸部平均亮度:人脸框缩到 16×16 取均值
  var lumaCanvas = null;
  function faceLuma(box) {
    try {
      if (!lumaCanvas) { lumaCanvas = document.createElement('canvas'); lumaCanvas.width = lumaCanvas.height = 16; }
      var c = lumaCanvas.getContext('2d', { willReadFrequently: true });
      c.drawImage(camVideo, box.x, box.y, box.width, box.height, 0, 0, 16, 16);
      var px = c.getImageData(0, 0, 16, 16).data, sum = 0;
      for (var i = 0; i < px.length; i += 4) sum += 0.299 * px[i] + 0.587 * px[i + 1] + 0.114 * px[i + 2];
      return sum / (px.length / 4);
    } catch (e) { return null; }
  }
  var missFrames = 0; // 连续漏检帧计数:单帧抖动不报「未检测到人脸」
  function onDetect(d) {
    var hint = '', ok = false;
    missFrames = d ? 0 : missFrames + 1;
    var hasFace = !!d, noFace = !hasFace && missFrames >= MISS_FRAMES_MAX;
    if (noFace) {
      hint = '未检测到人脸';
    } else if (!hasFace) {
      return; // 偶发漏检帧:保持上一条提示与状态,不扰动 ok 累积
    } else {
      // 提示优先级:无人脸 > 距离 > 居中 > 角度 > 光线
      var box = d.detection.box;
      var ratio = box.height / (camVideo.videoHeight || 1);
      if (ratio < FACE_NEAR) hint = '请靠近一点';
      else if (ratio > FACE_FAR) hint = '请远一点';
      else if (Math.abs(faceOffsetX(box)) > CENTER_TOL) hint = '请将脸部移入取景框';
      else {
        // 特征点取自原始帧(预览的 CSS 镜像不影响),三步的语义方向都按原始视角判定:
        // 标准机型 sideYawFlip 恒为 false,个别前置帧本身已镜像的机型由侧脸自校准翻转
        var tgt = CAM_STEPS[camStep].target;
        var pose = HeadPose.check(d.landmarks.positions, tgt, sideYawFlip);
        // 侧脸自校准:个别机型前置帧本身已镜像(语义 yaw 与实际转向持续相反)时自救——
        // 需连续 30 帧(~10s)强反向才翻转一次:阈值要高,否则用户转错方向 1~2s 就会被误判为镜像机,
        // 反而把错误的侧脸当合格抓走(左右图归属错乱)。翻转只动判定方向,不动预览画面
        if (tgt !== 'front' && pose.yaw != null && !mirrorCalibrated) {
          var wantSign = tgt === 'right' ? 1 : -1;
          if (pose.yaw * wantSign < -12) {
            if (++oppFrames >= 30) {
              sideYawFlip = !sideYawFlip;
              mirrorCalibrated = true;
              oppFrames = 0;
            }
          } else oppFrames = 0;
        }
        if (!pose.ok) hint = pose.hint;
        else {
          var luma = faceLuma(box);
          if (luma != null && luma < LUMA_DARK) hint = '请到光线充足处';
          else if (luma != null && luma > LUMA_BRIGHT) hint = '光线过强,请避开强光';
          else ok = true;
        }
      }
      window.__dbgRatio = ratio; // 自动化校准/测试用(检测框高/视频高)
    }
    setMask(ok ? 'ok' : (noFace ? 'no-face' : ''));
    // 合格时「保持不动」只显示不播报:随即抓拍,「拍摄完成」会截断它
    setHint(ok ? '保持不动' : hint, ok, ok);
    if (!ok) { okSince = 0; return; }
    if (!okSince) okSince = Date.now();
    else if (Date.now() - okSince >= OK_HOLD_MS) { okSince = 0; doCapture(); }
  }

  /* ─── 拍照流程(三步,顺序对齐 Figma:正脸 → 右脸出镜 → 左脸出镜) ─── */
  // 左右一律按用户本人的左右:右脸出镜=用户头向自己的左侧转(target 'right',产物作 right_image);
  // 左脸出镜=头向自己的右侧转(target 'left',产物作 left_image)。
  // mask 为 index.html 取景轮廓编号(1=左脸出镜 耳在画面左,2=右脸出镜 耳在画面右,均按镜像预览绘制)
  var CAM_STEPS = [
    { step: '1/3<br>请正脸出镜', guides: ['正脸居中', '取下眼镜', '光线充足'], target: 'front', mask: 0,
      done: '正脸拍摄完成' },
    { step: '2/3<br>请右脸出镜', guides: ['右脸居中', '取下眼镜', '光线充足'], target: 'right', mask: 2,
      done: '右脸拍摄完成', preview: '下一张:右脸出镜<br>请向左转头' },
    { step: '3/3<br>请左脸出镜', guides: ['左脸居中', '取下眼镜', '光线充足'], target: 'left', mask: 1,
      done: '左脸拍摄完成', preview: '下一张:左脸出镜<br>请向右转头' }
  ];
  var NEXT_PAUSE_MS = 2000; // 两张之间的停顿:给用户「下一张要拍什么」的心理预期
  function photosByView(ph) { // 拍摄顺序 → 送检/报告/历史统一口径 [正脸, 左脸, 右脸]
    var at = {};
    CAM_STEPS.forEach(function (s, i) { at[s.target] = ph[i]; });
    return [at.front, at.left, at.right];
  }
  var camStep = 0;

  function renderCamStep() {
    var cfg = CAM_STEPS[camStep];
    $('#cam-step').innerHTML = cfg.step;
    $('#cam-guide').innerHTML = cfg.guides
      .map(function (g) { return '<span>' + g + '</span>'; })
      .join('<i></i>');
    $('#cam-mask').setAttribute('data-step', cfg.mask); // 蒙版按步骤切换轮廓
    $('#cam-next').classList.remove('show');
    applyMirror();
    resetDetectState();
    voice.play(VOICE.step[camStep]); // 步骤引导语音
  }

  var camSeq = 0; // 流程令牌:退出拍照/开始拍照时递增,使未决的快门/分析回调失效
  var shutterLock = false; // 快门防连点锁:流程进行中直接忽略

  // 照片就绪(已通过校验)后推进流程:存图→「拍摄完成」→300ms 过渡→下一步;三步严格按顺序,本步合格才进下一步
  function onPhotoCaptured(dataUrl) {
    shutterLock = true; // 推进窗口上锁(停顿期间不检测、不接受快门),直到下一步/送检
    photos[camStep] = dataUrl;
    voice.play(VOICE.shot, { cut: true }); // 「拍摄完成」:已拍下,本步未播完的引导作废
    var seq = camSeq, hasNext = camStep < CAM_STEPS.length - 1;
    if (hasNext) {
      // 停顿卡:本张完成 + 下一张拍什么、往哪转;停顿结束再切到下一步(播下一步引导语音)
      setHint('');
      hideNudge();
      clearTimeout(nudgeTimer);
      setMask('');
      $('#cam-next-done').textContent = CAM_STEPS[camStep].done;
      $('#cam-next-tip').innerHTML = CAM_STEPS[camStep + 1].preview;
      $('#cam-next').classList.add('show');
    }
    setTimeout(function () {
      if (seq !== camSeq) return; // 期间已退出/重新开始:放弃本次推进
      if (hasNext) {
        camStep++;
        renderCamStep();      // 内含停顿卡收起与检测状态机重置
        shutterLock = false;  // 进入下一步即解锁
      } else {
        submitPhotos(seq);    // 三张拍完:送检
      }
    }, hasNext ? NEXT_PAUSE_MS : 300);
  }

  // 白屏补光抓拍:全屏纯白瞬间点亮→约300ms 后抓全分辨率帧→保持300ms 再淡出(总 600–900ms)
  function doCapture() {
    if (shutterLock) return;
    if (!camLive) return;
    shutterLock = true;
    capturing = true;
    clearTimeout(nudgeTimer);
    hideNudge();
    var seq = camSeq;
    var fill = $('#cam-fill');
    fill.classList.add('on'); // .on 无过渡,瞬间点亮
    if (navigator.vibrate) navigator.vibrate(30);
    setTimeout(function () {
      var shot = captureFromVideo();
      setTimeout(function () {
        fill.classList.remove('on'); // 移除 .on 恢复过渡,淡出
        capturing = false;
        if (seq !== camSeq) return; // 期间已退出/重置:不再推进(遮罩仍正常淡出)
        if (!shot) { shutterLock = false; okSince = 0; toast('相机尚未就绪,请稍候'); return; } // 重置 okSince:避免陈旧累积立即再抓
        onPhotoCaptured(shot);
      }, 300);
    }, 300);
  }

  // 三张拍完:按视角重排后送检(正脸=photos[0],左脸=photos[1],右脸=photos[2])
  function submitPhotos(seq) {
    camStep = 0;
    photos = photosByView(photos);
    openOverlay('p-analyzing');
    voice.play(VOICE.analyzing); // 「正在生成您的肌肤报告」
    // 档案与检测一起上报(后台记录用):年龄非法值服务端按 null 处理
    var profile = {
      age: +($('#f-age').value || 0) || null,
      gender: $('#f-gender').value || '',
      region: regionSel.value || '',
      skinType: SKINS[skinIndex].name
    };
    var t0 = Date.now();
    requestAnalyze(photos, seq, profile, function (errMsg, payload) {
      if (seq !== camSeq) return; // 流程已被重置:丢弃
      var wait = Math.max(0, 1200 - (Date.now() - t0)); // 分析中至少展示 1.2s,避免闪烁
      setTimeout(function () {
        if (seq !== camSeq) return;
        closeOverlay('p-analyzing');
        stopCamera();
        voice.stop(); // 结果已出:排队中的「分析中」等不再补播
        shutterLock = false; // 流程结束解锁
        if (errMsg) {
          voice.play(VOICE.fail, { cut: true });
          toast(errMsg);
          showScreen('s-profile'); // 回档案页,允许重新提交再拍
          popHistorySilently();
          return;
        }
        var vm = null;
        try {
          vm = payload.vm || SkinScore.buildViewModel(payload.result, payload.side, {
            realAge: profile.age,
            skinType: profile.skinType
          });
        } catch (e) { vm = null; }
        if (!vm) {
          toast('报告生成失败,请重新拍摄');
          showScreen('s-profile');
          popHistorySilently();
          return;
        }
        renderReport(vm, photos[0], photos[1], payload); // img1=正脸实拍,payload 供检测可视化取 face_maps/marks
        if (IS_MOCK) toast('演示报告，不保存至我的报告');
        else if (!payload.report_saved) toast('报告生成成功，但保存失败，请勿关闭页面并联系管理员');
        photos = []; // 报告已渲染(图片 src 已挂):释放三连拍 dataURL 内存
        showScreen('s-report', 'replace'); // 报告顶替拍照页:返回键回档案页,不再回到相机
      }, wait);
    });
  }

  function shutter() {
    if (shutterLock) return;
    if (camLive) {
      if (!isManualMode()) return; // 实时检测模式只自动抓拍,不接受手动快门
      if (!camVideo.videoWidth) { toast('相机尚未就绪,请稍候'); return; }
      doCapture(); // 识别不可用/mock:手动拍当前步,同样走白屏补光
    } else if (camFallback) {
      shutterLock = true; // 前置上锁防连点:change/cancel 回调里解锁
      camFile.click(); // 降级:调起系统相机,回调里推进
    } else {
      // 相机还在启动中
      toast('相机启动中,请稍候');
    }
  }

  /* ─── 分析请求(mock=1 直返内置样本;有 MOCK_FIXTURE 时用报告页可视化 fixture,便于离线/自动化验证) ─── */
  // 后端最多请求两次（各 60s），中间等待 4s；另留上传、落盘和响应传输余量。
  var ANALYZE_TIMEOUT_MS = 150000;
  function requestAnalyze(ph, seq, profile, done) {
    if (IS_MOCK && typeof SkinScore !== 'undefined') {
      setTimeout(function () {
        if (seq !== camSeq) return; // mock 同样尊重取消/重置
        var fx = window.MOCK_FIXTURE; // assets/mock/report-fixture.js(仅 mock 模式注入)
        if (fx) {
          // marks 坐标空间=fixture 照片空间:三连拍替换为 fixture 照片,保证可视化叠加对齐
          ph[0] = fx.photos[0]; ph[1] = fx.photos[1]; ph[2] = fx.photos[2];
          done(null, { result: fx.result, side: fx.side, face_rectangle: fx.face_rectangle });
        } else {
          done(null, { result: SkinScore.MOCK_RESULT, side: SkinScore.MOCK_SIDE });
        }
      }, 900);
      return;
    }
    var ctrl = typeof AbortController !== 'undefined' ? new AbortController() : null;
    var timer = setTimeout(function () { if (ctrl) ctrl.abort(); }, ANALYZE_TIMEOUT_MS);
    fetch('api/skin-analyze', {
      method: 'POST',
      headers: { 'Content-Type': 'application/json' },
      body: JSON.stringify({
        front_image: ph[0], left_image: ph[1], right_image: ph[2],
        profile: { // 档案随检测上报,后台记录用(服务端缺省 null)
          real_age: profile && profile.age,
          gender: profile && profile.gender,
          region: profile && profile.region,
          daily_skin_type: profile && profile.skinType
        }
      }),
      signal: ctrl ? ctrl.signal : undefined // 老内核无 AbortController:仅靠令牌丢弃迟到响应
    }).then(function (res) { return res.json(); })
      .then(function (data) {
        clearTimeout(timer);
        if (seq !== camSeq) return; // 流程已被重置,丢弃过期响应
        if (!data.ok) done(data.message || '检测失败,请重试');
        else done(null, data);
      })
      .catch(function (err) {
        clearTimeout(timer);
        if (seq !== camSeq) return;
        if (err && err.name === 'AbortError') done('检测服务开小差了,请稍候重试');
        else done('网络异常,请检查网络后重试');
      });
  }

  /* ─── SkinScore viewModel → 报告渲染(评分公式见 js/skin-score.js,不直接向用户展示 P 值) ─── */
  var LV_CLASS = { '良好': 'lv-good', '改善': 'lv-warn', '预警': 'lv-bad' };
  var CAT_DOM = {
    contour:  { s: '#s-contour',  lv: '#lv-contour',  tx: '#ditem-para1' },
    wrinkles: { s: '#s-wrinkles', lv: '#lv-wrinkles', tx: '#ditem-para2' },
    smooth:   { s: '#s-smooth',   lv: '#lv-smooth',   tx: '#tx-smooth' },
    tone:     { s: '#s-tone',     lv: '#lv-tone',     tx: '#tx-tone' },
    sens:     { s: '#s-sens',     lv: '#lv-sens',     tx: '#tx-sens' },
    acne:     { s: '#s-acne',     lv: '#lv-acne',     tx: '#tx-acne' }
  };

  function esc(s) {
    return String(s == null ? '' : s)
      .replace(/&/g, '&amp;').replace(/</g, '&lt;').replace(/>/g, '&gt;');
  }

  // 维度卡:整数位大字 + 小数位小字;进度条按 S/10;最高分浅绿、最低分橙色并标红挂「优先关注」
  function setDim(key, dim, rank) {
    var box = document.querySelector('.dim[data-dim="' + key + '"]');
    var el = $('#dim-' + key), has = dim.S != null;
    var parts = has ? dim.S.toFixed(1).split('.') : ['-', '-'];
    el.innerHTML = '<b>' + parts[0] + '</b>.' + parts[1];
    el.classList.toggle('dim-bad', has && rank === 'worst');
    box.classList.toggle('worst', has && rank === 'worst');
    box.classList.toggle('best', has && rank === 'best');
    box.querySelector('.dim-bar i').style.width = has ? Math.max(0, Math.min(100, dim.S * 10)) + '%' : '0';
  }

  function setCat(key, cat) {
    var dom = CAT_DOM[key];
    // 设计稿分类卡只有话术正文:不展示 S 与档位徽章;缺数据分类以说明代正文
    $(dom.tx).textContent = cat.P == null ? '本次未检出有效数据' : cat.text;
  }

  /* ─── 报告页检测可视化(face_maps 图层 + marks 坐标叠加,数据驱动) ─── */
  // 6 个分类各声明图片来源:map=整幅图层直接出图;overlay=透明增强图层盖在正脸上;marks=坐标标记画在正脸上
  // 增删标记类型/图层:改对应分类的一行即可
  var VIZ_CAT = {
    contour:  { img: '#ditem-img1', photo: true },                                   // 轮廓:用户正脸实拍
    wrinkles: { img: '#ditem-img2', overlay: 'texture_enhanced_lines', dim: 0.55 },  // 皱纹:正脸压暗+皱纹增强线(图层几乎全透明,直挂在白卡上不可读,故合成)
    smooth:   { img: '#viz-smooth', photo: true, marks: [                            // 光滑:正脸+色斑/痣/痤疮标记
      { key: 'brown_spot', color: '#B26A00' },   // 色斑
      { key: 'mole',       color: '#282828' },   // 痣
      { key: 'acne',       color: '#D30C0C' }    // 痤疮
    ] },
    water:    { img: '#viz-water', blendMap: 'water_area' },
    tone:     { img: '#viz-tone', blendMap: 'brown_area' },                          // 肤色水润:正脸×水分图正片叠底(water_area,接口返回)
    sens:     { img: '#viz-sens', blendMap: 'red_area' },                            // 敏感:正脸×红区图正片叠底(直挂白底过淡不可读)
    acne:     { img: '#viz-acne', photo: true, marks: [                              // 痘痘:正脸+闭口粉刺/痤疮标记
      { key: 'closed_comedones', color: '#E8A13D' }, // 闭口粉刺
      { key: 'acne',           color: '#D30C0C' },   // 痤疮
      { key: 'acne_pustule',   color: '#D30C0C' },   // 脓包
      { key: 'acne_nodule',    color: '#8E0000' }    // 结节
    ] }
  };

  /* viz-pure-begin(纯函数段:与 DOM 无关,node 冒烟按锚点抽离断言,勿改锚点注释) */
  // 从 result 提取某分类的标记集合:polygon 与 rectangle 都保留,缺该标记类型则跳过
  function vizCollectMarks(markDefs, result) {
    var out = [];
    if (!markDefs || !result) return out;
    for (var i = 0; i < markDefs.length; i++) {
      var src = result[markDefs[i].key];
      if (!src || typeof src !== 'object') continue;
      var m = { color: markDefs[i].color, polygons: [], rects: [] };
      var polys = src.polygon || [];
      for (var p = 0; p < polys.length; p++) {
        var pts = [];
        for (var q = 0; q < (polys[p] || []).length; q++) {
          var pt = polys[p][q];
          if (pt && typeof pt.x === 'number' && typeof pt.y === 'number') pts.push([pt.x, pt.y]);
        }
        if (pts.length > 2) m.polygons.push(pts);
      }
      var rects = src.rectangle || [];
      for (var r = 0; r < rects.length; r++) {
        var rc = rects[r];
        if (rc && typeof rc.left === 'number' && typeof rc.top === 'number') {
          m.rects.push({ left: rc.left, top: rc.top, width: +rc.width || 0, height: +rc.height || 0 });
        }
      }
      if (m.polygons.length || m.rects.length) out.push(m);
    }
    return out;
  }

  // marks 坐标空间 = 上传图片像素空间:按「画布自然宽 / 坐标空间宽」换算(画布=照片自然尺寸时比值为 1)
  function vizScaleMarks(marks, scale) {
    var out = [];
    for (var i = 0; i < marks.length; i++) {
      var m = marks[i], nm = { color: m.color, polygons: [], rects: [] };
      for (var p = 0; p < m.polygons.length; p++) {
        var pts = [];
        for (var q = 0; q < m.polygons[p].length; q++) pts.push([m.polygons[p][q][0] * scale, m.polygons[p][q][1] * scale]);
        nm.polygons.push(pts);
      }
      for (var r = 0; r < m.rects.length; r++) {
        var rc = m.rects[r];
        nm.rects.push({ left: rc.left * scale, top: rc.top * scale, width: rc.width * scale, height: rc.height * scale });
      }
      out.push(nm);
    }
    return out;
  }
  /* viz-pure-end */

  // face_maps 值兼容:已是 dataURL 直接用;裸 base64 按魔数补前缀;其它一律视为缺失(优雅降级)
  function vizMapURL(v) {
    if (typeof v !== 'string' || !v) return null;
    if (v.indexOf('data:image/') === 0) return v;
    if (v.indexOf('/9j/') === 0) return 'data:image/jpeg;base64,' + v;
    if (v.indexOf('iVBOR') === 0) return 'data:image/png;base64,' + v;
    return null;
  }

  function vizLoadImage(url, done) {
    var img = new Image();
    img.onload = function () { done(img.naturalWidth ? img : null); };
    img.onerror = function () { done(null); };
    img.src = url;
  }

  // canvas 合成:照片绘制到自然尺寸 → (可选压暗)→ (可选盖透明增强图层)→ 画坐标标记 → dataURL 挂到卡片 <img>
  var vizEpoch = 0;
  function vizCompose(photoURL, overlayURL, marks, imgEl, opts) {
    var epoch = vizEpoch;
    vizLoadImage(photoURL, function (photo) {
      if (!photo) return; // 照片不可用:保留占位
      var finish = function (overlay) {
        if (epoch !== vizEpoch) return;
        var w = photo.naturalWidth, h = photo.naturalHeight;
        var cv = document.createElement('canvas');
        cv.width = w; cv.height = h;
        var ctx = cv.getContext('2d');
        ctx.drawImage(photo, 0, 0, w, h);
        if (opts && opts.dim) { ctx.fillStyle = 'rgba(0,0,0,' + opts.dim + ')'; ctx.fillRect(0, 0, w, h); } // 压暗底色让增强线可读
        if (overlay) {
          if (opts && opts.blend) ctx.globalCompositeOperation = opts.blend; // 正片叠底:白底图层(红区/色沉)叠到脸上
          ctx.drawImage(overlay, 0, 0, w, h);
          ctx.globalCompositeOperation = 'source-over';
        }
        var scaled = vizScaleMarks(marks, w / photo.naturalWidth);
        var lw = Math.max(3, Math.round(w / 200)); // 线宽随图走,卡片缩略后仍可见
        var minBox = Math.round(w / 36);           // 过小标记放大到最小框,保证缩略可见
        for (var i = 0; i < scaled.length; i++) {
          var m = scaled[i];
          ctx.strokeStyle = m.color;
          ctx.fillStyle = m.color;
          ctx.lineWidth = lw;
          var p, q, pts, rc;
          for (p = 0; p < m.polygons.length; p++) {
            pts = m.polygons[p];
            ctx.beginPath();
            ctx.moveTo(pts[0][0], pts[0][1]);
            for (q = 1; q < pts.length; q++) ctx.lineTo(pts[q][0], pts[q][1]);
            ctx.closePath();
            ctx.globalAlpha = 0.22;
            ctx.fill();
            ctx.globalAlpha = 1;
            ctx.stroke();
          }
          for (p = 0; p < m.rects.length; p++) {
            rc = m.rects[p];
            var rw = Math.max(rc.width, minBox), rh = Math.max(rc.height, minBox);
            var cx = rc.left + rc.width / 2, cy = rc.top + rc.height / 2;
            ctx.strokeRect(cx - rw / 2, cy - rh / 2, rw, rh);
          }
        }
        try { imgEl.src = cv.toDataURL('image/jpeg', 0.9); imgEl.hidden = false; } catch (e) { /* 合成失败保留占位 */ }
      };
      if (overlayURL) vizLoadImage(overlayURL, finish);
      else finish(null);
    });
  }

  // 报告页 6 张检测图统一入口:任一输入缺失 → 该卡保留既有占位(不报错)
  function renderViz(payload, frontPhoto) {
    vizEpoch++;
    document.querySelectorAll('.ditem-img').forEach(function (img) { img.hidden = true; img.removeAttribute('src'); });
    var result = payload && payload.result;
    var maps = (result && result.face_maps) || {};
    for (var key in VIZ_CAT) {
      var cfg = VIZ_CAT[key];
      var imgEl = $(cfg.img);
      if (!imgEl) continue;
      if (cfg.map) { // 整幅图层:图层缺失 → 保留占位
        var u = vizMapURL(maps[cfg.map]);
        if (u) { imgEl.src = u; imgEl.hidden = false; }
        continue;
      }
      if (cfg.blendMap) { // 图层×正脸正片叠底(色沉/红区):无照片时直挂图层;图层缺失 → 保留占位
        var bu = vizMapURL(maps[cfg.blendMap]);
        if (!bu) continue;
        if (!frontPhoto) { imgEl.src = bu; imgEl.hidden = false; continue; }
        vizCompose(frontPhoto, bu, [], imgEl, { blend: 'multiply' });
        continue;
      }
      if (cfg.overlay) { // 透明增强图层(皱纹):有照片则合成(可按 cfg.dim 压暗),无照片单挂图层;图层缺失 → 保留占位
        var ov = vizMapURL(maps[cfg.overlay]);
        if (!ov) continue;
        if (!frontPhoto) { imgEl.src = ov; imgEl.hidden = false; continue; }
        vizCompose(frontPhoto, ov, [], imgEl, { dim: cfg.dim });
        continue;
      }
      // 照片类(轮廓/光滑/痘痘):无照片 → 保留占位;有坐标则 canvas 叠加,无坐标纯照片
      if (!frontPhoto) continue;
      var marks = cfg.marks ? vizCollectMarks(cfg.marks, result) : [];
      if (!marks.length) { imgEl.src = frontPhoto; imgEl.hidden = false; continue; }
      vizCompose(frontPhoto, null, marks, imgEl);
    }
  }

  function renderReport(vm, frontPhoto, sidePhoto, payload) {
    // 头部:综合评分(vm.total 缺失时回退三维度 S 均分×10)
    var total = vm.total;
    if (total == null) {
      var ds = [vm.dims.firm.S, vm.dims.vita.S, vm.dims.stab.S], sum = 0, n = 0, i;
      for (i = 0; i < 3; i++) if (typeof ds[i] === 'number') { sum += ds[i]; n++; }
      if (n) total = Math.round(sum / n * 10);
    }
    // 环形综合评分:满分 100,环长 2πr(r=52)≈326.73
    $('#stat-score').innerHTML = total != null ? '<b>' + total + '</b><i>分</i>' : '<b>--</b><i>分</i>';
    var ring = $('#ring-fg');
    ring.style.strokeDashoffset = total != null ? 326.73 * (1 - Math.max(0, Math.min(100, total)) / 100) : 326.73;
    $('#stat-age').innerHTML = vm.skinAgeDisplay != null ? '<b>' + vm.skinAgeDisplay + '</b><i>岁</i>' : '<b>--</b><i>岁</i>';
    // 肌龄对比胶囊(新版设计「比实际年龄年轻2岁」);缺实际年龄或肌龄时不展示
    var pill = $('#stat-age-note');
    var diff = vm.skinAgeDisplay != null && vm.realAge ? vm.skinAgeDisplay - vm.realAge : null;
    pill.hidden = diff == null;
    pill.textContent = diff == null ? '' : diff < 0 ? '比实际年龄年轻' + (-diff) + '岁' : diff > 0 ? '比实际年龄大' + diff + '岁' : '与实际年龄相当';

    // 三维度:按 P 排名,最低分标红 + 优先关注,最高分浅绿进度条
    var dimPs = { firm: vm.dims.firm.P, vita: vm.dims.vita.P, stab: vm.dims.stab.P };
    var ranked = Object.keys(dimPs).filter(function (k) { return dimPs[k] != null; })
      .sort(function (a, b) { return dimPs[a] - dimPs[b]; });
    var worstDimKey = ranked[0], bestDimKey = ranked.length > 1 ? ranked[ranked.length - 1] : null;
    ['firm', 'vita', 'stab'].forEach(function (k) {
      setDim(k, vm.dims[k], k === worstDimKey ? 'worst' : k === bestDimKey ? 'best' : '');
    });
    var presentation = payload && payload.presentation || ReportUI.build(vm, payload && payload.result);
    $('#dims-note').textContent = '';
    var textIds = { contour: '#ditem-para1', wrinkles: '#ditem-para2', color: '#tx-tone', smooth: '#tx-smooth', water: '#tx-water', sens: '#tx-sens', acne: '#tx-acne' };
    presentation.views.forEach(function (v) { $(textIds[v.key]).textContent = v.text; });

    // 检测可视化:轮廓=正脸实拍,其余按 VIZ_CAT 取 face_maps 图层或叠加 marks(payload 缺失时各卡保留占位)
    renderViz(payload, frontPhoto);

    // 降级标注:只展示用户可感知/可执行的(下颌线、侧脸、补拍类);
    // 引擎内部技术项(上限锁未执行/字段未返回等)不面向用户展示
    var notesEl = $('#vm-notes');
    var userNotes = (vm.notes || [])
      .filter(function (t) { return /下颌线|侧脸|补拍|重拍/.test(t); })
      .map(function (t) { return t.replace(/\(quality=[^)]*\)/g, ''); }); // 接口质量码仅留在引擎留痕里
    if (userNotes.length) {
      notesEl.innerHTML = userNotes.map(function (t) { return '*' + esc(t); }).join('<br>');
      notesEl.style.display = '';
    } else {
      notesEl.style.display = 'none';
    }

    $('#care-list').innerHTML = presentation.care.map(function (s, i) {
      return '<p class="care-item">' + (i + 1) + '、' + esc(s.text) + '</p>';
    }).join('') || '<p class="care-item">本次有效数据不足，暂无个性化护理建议。</p>';
    var product = presentation.product;
    $('.card-product').hidden = !product;
    $('.prod-title').hidden = !product;
    $('#product-unavailable').hidden = !!product;
    if (product) {
      $('#product-title').textContent = product.title;
      $('#product-name').textContent = product.name + '双仓精华液';
      $('#product-image').src = product.image;
      $('#product-image').alt = product.name + '双仓精华液';
    }
  }

  /* ─── 相机可用后加载检测模型(加载完成前快门即手动模式) ─── */
  function beginDetect() {
    if (IS_MOCK || camFallback) { resetDetectState(); return; }
    if (typeof faceapi === 'undefined') {
      detectDisabled = true; // face-api 本身缺失:全程手动,不再重试
      resetDetectState();
      toast('自动识别不可用,已切换手动拍摄');
      return;
    }
    detectDisabled = false; // 上次模型加载失败允许重试(modelsPromise 失败时已清空,loadModels 会重新拉取)
    resetDetectState();
    if (!modelsOk) showCamStatus('检测引擎加载中…');
    loadModels().then(function () {
      $('#cam-status').classList.remove('show');
      maybeStartDetect();
    }).catch(function () {
      $('#cam-status').classList.remove('show');
      detectDisabled = true; // 仅禁用当次;下次进拍照页 beginDetect 复位后重试
      resetDetectState();
      if (currentScreen === 's-cam') toast('自动识别不可用,已切换手动拍摄');
    });
  }

  /* ─── 隐私勾选 ─── */
  var agreed = false;
  $('#privacy-row').addEventListener('click', function (e) {
    if (e.target.closest('#privacy-policy-link')) return; // 点协议链接:只开弹层,不切换勾选
    e.preventDefault();
    agreed = !agreed;
    $('#privacy-check').classList.toggle('checked', agreed);
  });

  /* ─── 隐私协议占位弹层(QA P3-2) ─── */
  $('#privacy-policy-link').addEventListener('click', function (e) {
    e.preventDefault();
    e.stopPropagation(); // 阻止冒泡到勾选行,避免误切换
    openOverlay('p-policy');
  });

  /* ─── 报告页:每张维度卡各自的子 Tab;点检测图放大,再点返回 ─── */
  document.querySelectorAll('.card-detail').forEach(function (card) {
    card.addEventListener('click', function (e) {
      var btn = e.target.closest('.dtab');
      if (btn) { setDetailTab(card, btn.dataset.tab); return; }
      var img = e.target.closest('.ditem-img');
      if (img && img.src && !img.hidden) {
        $('#zoom-img').src = img.src;
        openOverlay('p-zoom');
        history.pushState({ screen: currentScreen, overlay: 'p-zoom' }, '');
      }
    });
  });
  $('#p-zoom').addEventListener('click', function () {
    closeOverlay('p-zoom');
    popHistorySilently();
  });

  /* ─── 动作分发 ─── */
  var actions = {
    'open-policy':     function () { openOverlay('p-policy'); },
    'login-browser':   function () { loginBrowser(); },
    'login-wechat':    function () { loginWechat(); },
    'open-privacy':    function () { if (!AccountClient.user()) { showScreen('s-login', 'replace'); return; } openOverlay('p-privacy'); },
    'close-privacy':   function () { closeOverlay('p-privacy'); },
    'close-policy':    function () { closeOverlay('p-policy'); },
    'agree-continue':  function () {
      if (!agreed) { toast('请先阅读并同意隐私协议'); return; }
      closeOverlay('p-privacy');
      showScreen('s-profile', 'push');
    },
    'submit-profile':  function () {
      var age = +$('#f-age').value;
      if (!$('#f-birth').value || !(age >= 1 && age <= 99)) { toast('请选择出生年月'); return; }
      if (!$('#f-gender').value) { toast('请选择性别'); return; }
      if (!regionSel.value) { toast('请选择所在地区'); return; }
      openOverlay('p-photoguide');
    },
    'close-photoguide': function () { closeOverlay('p-photoguide'); },
    'start-camera':    function () {
      closeOverlay('p-photoguide');
      camSeq++; // 使旧的快门/分析回调失效
      camStep = 0;
      photos = []; // 新一轮三连拍(从 startCamera 挪出:后台恢复续拍时保留已拍)
      shutterLock = false; // 重新进入流程,保险解锁
      showScreen('s-cam', 'push');
      startCamera(); // beginDetect 在其成功回调里:确认相机可用才加载模型
      renderCamStep(); // 在 startCamera 复位降级标记之后渲染,快门显隐按本次模式
    },
    'shutter':         shutter,
    'album':           function () {
      shutterLock = true; // 与降级快门同策略:前置上锁,change/cancel 解锁
      albumFile.click();
    },
    'flip':            function () { // 切换前后镜头
      if (camFallback) { toast('系统相机模式下请在系统相机内切换'); return; }
      if (!camStream) { toast('相机启动中,请稍候'); return; }
      camFacing = camFacing === 'user' ? 'environment' : 'user';
      camMirrored = camFacing === 'user';
      startCamera(); // 复用启停与预热(camSeqCam 防竞态)
    },
    'history':         function () { openHistory(); },
    'history-retry':   function () { renderHistoryList(); }
  };

  document.addEventListener('click', function (e) {
    var el = e.target.closest('[data-action]');
    if (!el) return;
    var fn = actions[el.dataset.action];
    if (fn) fn();
  });

  /* Reports and complete immutable snapshots live on the authenticated backend. */
  var historySeq = 0;
  function renderHistoryList() {
    var seq = ++historySeq, box = $('#history-list');
    box.textContent = '正在读取报告…';
    AccountClient.request('api/reports').then(function (data) {
      if (seq !== historySeq) return;
      $('#history-count').textContent = '您最近已进行过' + data.total + '次面部问题检测';
      $('#identity-note').textContent = AccountClient.user().kind === 'wechat'
        ? '保留最近 5 份报告，同一微信账号可跨手机查看。'
        : '保留最近 5 份报告。本机身份仅限当前浏览器；更换手机或清除浏览器数据后无法找回。';
      if (!data.items.length) { box.innerHTML = '<p class="history-empty">暂无报告<br>完成一次检测后，报告会自动保存在这里。</p>'; return; }
      box.innerHTML = data.items.map(function (item) {
        var date = new Date(item.created_at).toLocaleDateString('sv-SE');
        return '<article class="card history-item"><p><span>测试时间</span> ' + esc(date) +
          '</p><button class="history-detail" data-report-id="' + esc(item.id) + '">查看详情</button></article>';
      }).join('');
    }).catch(function (e) {
      if (seq !== historySeq) return;
      $('#history-count').textContent = '暂时无法读取';
      box.textContent = e.message + '，请刷新列表重试。';
    });
  }
  function openHistory() {
    showScreen('s-history', 'push');
    renderHistoryList();
  }
  $('#history-list').addEventListener('click', function (event) {
    var btn = event.target.closest('[data-report-id]');
    if (!btn || btn.disabled) return;
    btn.disabled = true;
    AccountClient.request('api/reports/' + encodeURIComponent(btn.dataset.reportId)).then(function (data) {
      if (currentScreen !== 's-history') return;
      var entry = data.report;
      renderReport(entry.vm, entry.photos[0], entry.photos[1], Object.assign({}, entry.payload, { presentation: entry.presentation }));
      showScreen('s-report', 'push');
    }).catch(function (e) { toast(e.message); }).finally(function () { btn.disabled = false; });
  });

  var loginBusy = false;
  function loginAllowed() {
    if (loginBusy) return false;
    if (!$('#login-consent').checked) { toast('请先阅读并同意用户协议和隐私政策'); return false; }
    return true;
  }
  function loginBrowser() {
    if (!loginAllowed()) return;
    loginBusy = true;
    $('#login-message').textContent = '正在登录…';
    AccountClient.browser(true).then(function () {
      showScreen('s-splash', 'replace');
    }).catch(function (e) { $('#login-message').textContent = e.message; })
      .finally(function () { loginBusy = false; });
  }
  function loginWechat() {
    if (!loginAllowed()) return;
    loginBusy = true;
    AccountClient.request('api/auth/config').then(function (data) {
      if (!data.wechat) {
        $('#login-message').textContent = data.reason + '。报告仍会保存至服务端。';
        return;
      }
      if (!/MicroMessenger/i.test(navigator.userAgent)) {
        $('#login-message').textContent = '请在微信内打开本页面，或使用本机浏览器登录。';
        return;
      }
      return AccountClient.request('api/auth/wechat', { consent: true }).then(function (data) {
        location.assign(data.url);
      });
    }).catch(function (e) { $('#login-message').textContent = e.message; })
      .finally(function () { loginBusy = false; });
  }
  /* ─── 页面隐藏/来电生命周期:隐藏即停相机与全部定时器,回前台从当前步恢复(保留 photos[] 与 camStep) ─── */
  function handleCamHidden() {
    if (currentScreen !== 's-cam') return;
    camSeq++; // 使未决的快门/推进/分析回调失效(白屏定时器醒来即自洁退出)
    voice.stop(true);
    shutterLock = false;
    capturing = false;
    $('#cam-fill').classList.remove('on'); // 白屏若亮着立即熄灭
    closeOverlay('p-analyzing');           // 分析中被打断:回调已作废,弹层不能残留
    stopCamera(); // 停检测循环/倒计时/nudge 并释放摄像头(camSeqCam++ 令迟到授权回调失效)
  }
  function handleCamVisible() {
    if (currentScreen !== 's-cam') return;
    camSeq++;        // 双保险:隐藏期间残留的迟到回调一并作废
    renderCamStep(); // 重置当前步检测状态机,从当前步继续
    if (!camFallback) startCamera(); // 降级模式无流可起,仅重置状态机;重走 camSeqCam 令牌防复活
  }
  document.addEventListener('visibilitychange', function () {
    if (document.hidden) handleCamHidden(); else handleCamVisible();
  });
  window.addEventListener('pagehide', handleCamHidden);
  window.addEventListener('pageshow', function (e) {
    if (e.persisted) handleCamVisible(); // bfcache 恢复(不一定伴随 visibilitychange)
  });

  /* ─── 微信安卓端:字体大小设置不走 text-size-adjust,需经 JSBridge 重置为标准并屏蔽后续调整 ─── */
  (function lockWeixinFontSize() {
    function lock() {
      var B = window.WeixinJSBridge;
      if (!B) return;
      B.invoke('setFontSizeCallback', { fontSize: 0 });
      B.on('menu:setfont', function () { B.invoke('setFontSizeCallback', { fontSize: 0 }); });
    }
    if (window.WeixinJSBridge) lock();
    else document.addEventListener('WeixinJSBridgeReady', lock, false);
  })();

  /* ─── 初始化 ─── */
  history.replaceState({ screen: 's-login' }, ''); // 刷新后从启动页开始,历史栈的屏标记与之对齐
  renderCamStep();
  if (!(/[?&]mock=1/.test(location.search) && /[?&]screen=report/.test(location.search))) {
    loginBusy = true;
    AccountClient.init().then(function () {
      if (AccountClient.user()) showScreen('s-splash', 'replace');
      else $('#login-message').textContent = /[?&]login_error=/.test(location.search)
        ? '微信登录未完成，可重试或使用本机浏览器登录。'
        : '本机登录仅限当前浏览器，不支持换手机找回。';
    }).catch(function (e) { $('#login-message').textContent = e.message; })
      .finally(function () { loginBusy = false; });
  }
  // 仅调试用:?mock=1&screen=report 直渲 mock 报告页(供无头浏览器截图验证布局,非正式入口)
  // 有 MOCK_FIXTURE 时走 fixture(检测可视化同步出图),否则回退 SkinScore 内置样本
  if (IS_MOCK && /[?&]screen=report/.test(location.search) && typeof SkinScore !== 'undefined') {
    showScreen('s-report');
    try {
      var fx = window.MOCK_FIXTURE;
      var mockRes = fx ? fx.result : SkinScore.MOCK_RESULT;
      var mockSide = fx ? fx.side : SkinScore.MOCK_SIDE;
      renderReport(SkinScore.buildViewModel(mockRes, mockSide, {
        realAge: +($('#f-age').value || 0) || 28, // 调试档案缺省 28 岁
        skinType: SKINS[skinIndex].name
      }), fx ? fx.photos[0] : null, null, fx ? { result: mockRes, side: mockSide, face_rectangle: fx.face_rectangle } : null);
    } catch (e) { /* 调试入口异常不阻塞正式流程 */ }
  }
})();