/* MeowPanel — 前端逻辑（纯静态，零第三方依赖）
 *
 * 对接协议：devdocs/plan/MEOWPANEL_PROTOCOL.md（草案，后端未实现）。
 * 所有 fetch 失败都优雅降级为「后端未连接」，不假设后端就绪。
 */
(function () {
  'use strict';

  /* ---------------- 小工具 ---------------- */
  const $ = (sel, root) => (root || document).querySelector(sel);
  const $$ = (sel, root) => Array.prototype.slice.call((root || document).querySelectorAll(sel));

  function storageGet(k) { try { return localStorage.getItem(k); } catch (e) { return null; } }
  function storageSet(k, v) { try { localStorage.setItem(k, v); } catch (e) {} }
  function storageDel(k) { try { localStorage.removeItem(k); } catch (e) {} }

  function esc(s) {
    return String(s == null ? '' : s).replace(/[&<>"']/g, m => ({
      '&': '&amp;', '<': '&lt;', '>': '&gt;', '"': '&quot;', "'": '&#39;'
    }[m]));
  }
  function fmtBytes(n) {
    if (n == null || isNaN(n)) return '—';
    const u = ['B', 'KB', 'MB', 'GB', 'TB']; let v = Number(n), i = 0;
    while (v >= 1024 && i < u.length - 1) { v /= 1024; i++; }
    return (i === 0 ? v : v.toFixed(1)) + ' ' + u[i];
  }
  function fmtUptime(sec) {
    if (sec == null || isNaN(sec)) return '—';
    sec = Math.floor(sec);
    const d = Math.floor(sec / 86400), h = Math.floor((sec % 86400) / 3600), m = Math.floor((sec % 3600) / 60);
    return (d > 0 ? d + ' 天 ' : '') + h + ' 小时 ' + m + ' 分';
  }
  function fmtTime(ts) { return ts ? new Date(ts * 1000).toLocaleString() : '—'; }
  function debounce(fn, ms) { let t = null; return function () { const a = arguments, c = this; clearTimeout(t); t = setTimeout(() => fn.apply(c, a), ms); }; }
  function pct(p) { return Math.max(0, Math.min(100, p)); }

  /* ---------------- 音频电平表 / 仪表盘工具（deci-dB → dBFS；-990 = -inf） ---------------- */
  function deciToDb(v) { return (v == null || v <= -990) ? null : v / 10; }
  function fmtDb(v) {
    const db = deciToDb(v);
    if (db == null) return '−∞';
    return (db > 0 ? '+' : '') + db.toFixed(1);
  }
  function dbPct(v) {   // -60..0 dBFS 映射到 0..100% 条宽
    const db = deciToDb(v);
    if (db == null) return 0;
    return Math.max(0, Math.min(100, (db + 60) / 60 * 100));
  }
  function isAvail(b) { return !!(b && b.available !== false); }
  const sparkRms = [], sparkPeak = [];
  const SPARK_MAX = 30;
  function sparklineHtml() {
    return '<svg class="lvl-spark" viewBox="0 0 100 46" preserveAspectRatio="none" aria-hidden="true">' +
      '<line class="grid" x1="0" y1="46" x2="100" y2="46"/>' +
      '<line class="grid" x1="0" y1="23" x2="100" y2="23"/>' +
      '<polyline class="spk-rms" points="" fill="none" stroke="#00bfa5" stroke-width="1.6" vector-effect="non-scaling-stroke"/>' +
      '<polyline class="spk-peak" points="" fill="none" stroke="#ffb300" stroke-width="1.6" vector-effect="non-scaling-stroke"/>' +
      '</svg>';
  }
  function sparklinePoints(arr) {
    const n = arr.length;
    if (!n) return '';
    return arr.map((v, i) => {
      const x = (i / (SPARK_MAX - 1)) * 100;
      return x.toFixed(1) + ',' + (46 - Math.max(0, Math.min(100, v)) / 100 * 40).toFixed(1);
    }).join(' ');
  }
  function pushSpark(v, arr) {   // deci-dB → 0..100 百分比入队（<=30 点）
    arr.push(dbPct(v));
    if (arr.length > SPARK_MAX) arr.shift();
  }
  function drawSpark(rootEl) {
    const svg = rootEl && rootEl.querySelector('.lvl-spark');
    if (!svg) return;
    const r = svg.querySelector('.spk-rms'), p = svg.querySelector('.spk-peak');
    if (r) r.setAttribute('points', sparklinePoints(sparkRms));
    if (p) p.setAttribute('points', sparklinePoints(sparkPeak));
  }
  function resetSpark() { sparkRms.length = 0; sparkPeak.length = 0; }
  function levelMeterHtml() {
    return '<div class="lvl">' +
      '<div class="lvl-row"><span class="lvl-lbl">RMS</span>' +
        '<div class="lvl-meter"><div class="lvl-fill rms" style="width:0%"></div></div>' +
        '<span class="lvl-val" data-val="rms">−∞</span></div>' +
      '<div class="lvl-row"><span class="lvl-lbl">PEAK</span>' +
        '<div class="lvl-meter"><div class="lvl-fill peak" style="width:0%"></div></div>' +
        '<span class="lvl-val" data-val="peak">−∞</span></div>' +
      '<div class="lvl-scale"><span>-60</span><span>-40</span><span>-20</span><span>0 dBFS</span></div>' +
      sparklineHtml() + '</div>';
  }
  function updateLevelMeter(rootEl, d) {
    if (!rootEl) return;
    const rms = (d && d.available) ? d.rms : null;
    const peak = (d && d.available) ? d.peak : null;
    const fr = rootEl.querySelector('.lvl-fill.rms');
    const fp = rootEl.querySelector('.lvl-fill.peak');
    const vr = rootEl.querySelector('.lvl-val[data-val="rms"]');
    const vp = rootEl.querySelector('.lvl-val[data-val="peak"]');
    if (fr) fr.style.width = dbPct(rms) + '%';
    if (fp) fp.style.width = dbPct(peak) + '%';
    if (vr) vr.textContent = fmtDb(rms);
    if (vp) vp.textContent = fmtDb(peak);
    pushSpark(rms, sparkRms); pushSpark(peak, sparkPeak);
    drawSpark(rootEl);
  }
  function homeKv(k, v) {
    return '<div class="home-kv"><span class="k">' + esc(k) + '</span><span class="v">' + v + '</span></div>';
  }
  function homeUnavailable() { return '<div class="home-sub">— 数据不可用</div>'; }
  function homeCard(title, body) { return '<div class="card"><h3 class="card-title">' + esc(title) + '</h3>' + body + '</div>'; }
  function modePill(m) {
    if (!m) return '<span class="home-chip mut">—</span>';
    const cls = (m === 'meow') ? 'ok' : ((m === 'hiby') ? 'warn' : 'mut');
    return '<span class="home-chip ' + cls + '">' + esc(m) + '</span>';
  }

  /* ---------------- 全局状态 ---------------- */
  const state = {
    style: 'md3', mode: 'dark',       // 已解析的风格/明暗（应用到 <html> data-style/data-mode）
    devStyle: null, devTheme: null,   // 设备 settings.conf 的 ui.style / display.theme（默认来源）
    conn: 'unknown',
    filesRel: '/', filesAbs: null,
    perfTimer: null,               // 性能页轮询
    route: 'perf',
    unauth: false,                 // 鉴权未通过（弹登录页）
    downloadNonce: 0
  };

  /* ---------------- 后端连接状态 ---------------- */
  function setConn(ok) {
    state.conn = ok ? 'ok' : 'bad';
    const dot = $('#conn-dot');
    dot.dataset.state = state.conn;
    $('#conn-text').textContent = ok ? '在线' : '离线';
    $('#offline-banner').hidden = !!ok;
  }

  /* ---------------- API 客户端 ---------------- */
  // 返回 {code,message,status} 形异常；网络/非 JSON → 视为断连
  async function api(method, path, body) {
    let res;
    const headers = {};
    const token = storageGet('meowpanel.token');
    if (token) headers['X-MeowToken'] = token;
    const init = { method: method || 'GET' };
    if (body instanceof FormData) {
      init.body = body;
    } else if (body !== undefined && body !== null) {
      headers['Content-Type'] = 'application/json';
      init.body = JSON.stringify(body);
    }
    if (Object.keys(headers).length) init.headers = headers;
    try {
      res = await fetch(path, init);
    } catch (e) {
      setConn(false);
      throw { code: 'NETWORK', message: '后端未连接', status: 0 };
    }
    let json = null;
    try { json = await res.json(); } catch (e) { json = null; }
    if (!json || typeof json.ok !== 'boolean') {
      // 静态服务器返回 HTML / 404 等
      setConn(res.ok ? true : false);
      throw { code: 'NOT_JSON', message: '后端返回了非 JSON 响应（HTTP ' + res.status + '）', status: res.status };
    }
    if (!json.ok) {
      setConn(true);
      const code = (json.error && json.error.code) || 'ERROR';
      if (code === 'UNAUTHORIZED') authRequired();   // 会话失效/未认证 → 弹登录页
      throw { code: code, message: (json.error && json.error.message) || ('后端错误 ' + code), status: res.status };
    }
    setConn(true);
    return json.data;
  }

  // 下载（返回 blob URL）
  async function apiDownload(path) {
    let res;
    const headers = {};
    const token = storageGet('meowpanel.token');
    if (token) headers['X-MeowToken'] = token;
    try { res = await fetch(path, Object.keys(headers).length ? { headers: headers } : undefined); }
    catch (e) { setConn(false); throw { code: 'NETWORK', message: '后端未连接' }; }
    if (!res.ok) { setConn(true); throw { code: 'HTTP_' + res.status, message: '下载失败（HTTP ' + res.status + '）' }; }
    setConn(true);
    return URL.createObjectURL(await res.blob());
  }

  /* ----------------  toast / 确认弹窗 ---------------- */
  let toastTimer = null;
  function toast(msg, ms) {
    const t = $('#toast');
    t.textContent = msg; t.hidden = false;
    clearTimeout(toastTimer);
    toastTimer = setTimeout(() => { t.hidden = true; }, ms || 2600);
  }
  function confirmDlg(title, body, danger) {
    return new Promise(res => {
      $('#modal-title').textContent = title || '确认';
      $('#modal-body').textContent = body || '';
      const yes = $('#modal-yes'), no = $('#modal-no');
      yes.className = 'btn btn-primary' + (danger ? ' btn-danger' : '');
      const scrim = $('#modal'); scrim.hidden = false;
      const done = v => { scrim.hidden = true; yes.onclick = no.onclick = scrim.onclick = null; res(v); };
      yes.onclick = () => done(true);
      no.onclick = () => done(false);
      scrim.onclick = e => { if (e.target === scrim) done(false); };
    });
  }

  /* ---------------- 访问级 PIN 鉴权（设置 PIN → 登录；401 自动跳登录；token 存 localStorage） ----------------
   * 后端：访问面板即需登录；token 存面板进程内存（重启失效，3 天固定不滑动续期）；连续 5 次错 PIN 锁 5 分钟。
   * 前端：token 存 localStorage 随请求带 X-MeowToken；401 自动切登录页；未设 PIN 走首次设置流程。 */
  let authMode = 'login';            // 'login' | 'setup'
  function loginErr(msg) { const err = $('#login-err'); if (err) { err.textContent = msg; err.hidden = false; } }
  function authRequired() {          // 任一路由收到 401 → 弹登录页（会话失效/未认证）
    state.unauth = true;
    refreshAuthGate();
  }
  async function refreshAuthGate() { // 查状态决定「首次设置」还是「登录」
    let st = null;
    try { st = await api('GET', '/api/auth/status'); } catch (e) { st = null; }
    if (st && st.session) { state.unauth = false; hideLogin(); return; }
    if (st && !st.pin_set && !st.legacy) showLogin('setup');
    else showLogin('login');
  }
  function showLogin(mode) {
    state.unauth = true;
    authMode = mode || 'login';
    const lg = $('#login'); if (lg) lg.hidden = false;
    const sub = $('#login-sub');
    const pin2 = $('#login-pin2');
    const btn = $('#login-btn');
    if (authMode === 'setup') {
      if (sub) sub.textContent = '首次使用：请设置一个 4 位数字 PIN 作为本面板访问口令。';
      if (pin2) pin2.hidden = false;
      if (btn) btn.textContent = '设 置';
    } else {
      if (sub) sub.textContent = '此面板已开启访问鉴权，请输入 4 位 PIN。';
      if (pin2) pin2.hidden = true;
      if (btn) btn.textContent = '登 录';
    }
    const ip = $('#login-pin'); if (ip) { ip.value = ''; ip.focus(); }
    const ip2 = $('#login-pin2'); if (ip2 && authMode !== 'setup') ip2.value = '';
    const err = $('#login-err'); if (err) err.hidden = true;
  }
  function hideLogin() { const lg = $('#login'); if (lg) lg.hidden = true; }
  async function doLogin() {
    const pin = ($('#login-pin').value || '').trim();
    const err = $('#login-err'); if (err) err.hidden = true;
    if (!pin) { loginErr('请输入 PIN'); return; }
    if (authMode === 'setup') {
      const pin2 = ($('#login-pin2').value || '').trim();
      if (pin.length !== 4 || /[^0-9]/.test(pin)) { loginErr('PIN 必须为 4 位数字'); return; }
      if (pin !== pin2) { loginErr('两次输入的 PIN 不一致'); return; }
      const btn = $('#login-btn'); if (btn) btn.disabled = true;
      try {
        await api('POST', '/api/auth/setup', { pin: pin });
        toast('PIN 已设置，请登录');
        showLogin('login');
      } catch (e2) { loginErr((e2 && e2.message) ? e2.message : '设置失败'); }
      finally { if (btn) btn.disabled = false; }
      return;
    }
    const btn = $('#login-btn'); if (btn) btn.disabled = true;
    try {
      const d = await api('POST', '/api/auth/login', { pin: pin });
      storageSet('meowpanel.token', d.token);
      state.unauth = false;
      hideLogin();
      toast('已登录');
      if (started) route(); else startApp();
    } catch (e) {
      if (e && (e.code === 'LOCKED' || e.status === 429)) loginErr(e.message || '错误次数过多，已锁定，请稍后重试');
      else loginErr((e && e.message) ? e.message : '登录失败');
    } finally {
      const b = $('#login-btn'); if (b) b.disabled = false;
    }
  }
  function bindLogin() {
    const ok = $('#login-btn'); if (ok) ok.addEventListener('click', doLogin);
    const ip = $('#login-pin'); if (ip) ip.addEventListener('keydown', e => { if (e.key === 'Enter') doLogin(); });
    // PIN 输入：只允许数字，最长 4 位
    [ip, $('#login-pin2')].forEach(el => { if (el) el.addEventListener('input', () => { el.value = el.value.replace(/[^0-9]/g, '').slice(0, 4); }); });
  }
  function passwordDlg(title, body) {
    return new Promise(res => {
      $('#pwdlg-title').textContent = title || '设置面板密码';
      $('#pwdlg-body').textContent = body || '请输入新密码（留空则清除密码）。';
      const inp = $('#pwdlg-input'); inp.value = ''; inp.focus();
      const scrim = $('#pwdlg'); scrim.hidden = false;
      const okb = $('#pwdlg-ok'), cancel = $('#pwdlg-cancel');
      const done = v => { scrim.hidden = true; okb.onclick = cancel.onclick = scrim.onclick = inp.onkeydown = null; res(v); };
      okb.onclick = () => done(inp.value);
      cancel.onclick = () => done(null);
      scrim.onclick = e => { if (e.target === scrim) done(null); };
      inp.onkeydown = e => { if (e.key === 'Enter') done(inp.value); if (e.key === 'Escape') done(null); };
    });
  }
  async function setPanelPassword() {
    const np = await passwordDlg('设置面板密码', '请输入新密码（留空则清除密码）。');
    if (np === null) return;                  // 取消
    try {
      await api('PUT', '/api/settings/panel.auth_pass', { value: np });
      toast(np ? '面板密码已设置' : '面板密码已清除');
      renderSettings();
    } catch (e) { toast('设置失败：' + errText(e)); }
  }
  function bindPwDlg() { /* #content 点击委托在 bindSettings 里处理 pass 按钮；此处无需额外绑定 */ }

  /* ---------------- 主题（MD3/MIUIx × 明/暗） ----------------
   * <html> data-style（md3/miuix）× data-mode（dark/light），四套 CSS 变量表驱动。
   * 默认值联动设备 settings.conf（ui.style / display.theme，经 GET /api/theme 读取）；
   * 面板内选择存 localStorage，作为本面板覆盖（不写设备）：
   *   meowpanel.style = md3|miuix      （缺省 = 跟随设备 ui.style）
   *   meowpanel.mode  = system|browser|light|dark
   *                     （缺省 system = 跟随设备 display.theme；
   *                       browser = 跟随浏览器 prefers-color-scheme，日/夜切换实时生效）
   * 顶栏切换器保留旧行为：本面板生效 + 经 PUT /api/theme 同步设备。 */
  function browserMode() {
    try { return (window.matchMedia && matchMedia('(prefers-color-scheme: light)').matches) ? 'light' : 'dark'; }
    catch (e) { return 'dark'; }
  }
  function storedStyle() { const v = storageGet('meowpanel.style'); return (v === 'md3' || v === 'miuix') ? v : null; }
  function storedMode() { const v = storageGet('meowpanel.mode'); return (v === 'system' || v === 'browser' || v === 'light' || v === 'dark') ? v : null; }
  function resolveStyle() { return storedStyle() || state.devStyle || 'md3'; }
  function resolveMode() {
    const m = storedMode() || 'system';
    if (m === 'light' || m === 'dark') return m;
    if (m === 'system') return state.devTheme || browserMode();   // 设备未知时回退浏览器偏好
    return browserMode();
  }
  function devStyleLabel() { return state.devStyle ? (state.devStyle === 'miuix' ? 'MIUIx' : 'Material You') : '未知（后端离线）'; }
  function devThemeLabel() { return state.devTheme ? (state.devTheme === 'light' ? '浅色' : '深色') : '未知（后端离线）'; }
  function applyTheme() {
    const style = resolveStyle(), mode = resolveMode();
    state.style = style; state.mode = mode;
    const root = document.documentElement;
    root.dataset.style = style; root.dataset.mode = mode;
    $$('#style-seg .seg-btn').forEach(b => b.classList.toggle('active', b.dataset.style === style));
    $$('#theme-seg .seg-btn').forEach(b => b.classList.toggle('active', b.dataset.mode === mode));
    // 设置页「主题」卡（仅在该页渲染时存在）
    $$('#set-style-seg .seg-btn').forEach(b => b.classList.toggle('active', b.dataset.style === style));
    $$('#set-mode-seg .seg-btn').forEach(b => b.classList.toggle('active', b.dataset.mode === (storedMode() || 'system')));
    const rst = $('#set-style-reset'); if (rst) rst.disabled = !storedStyle();
  }
  async function sendTheme(patch) {
    try { await api('PUT', '/api/theme', patch); }
    catch (e) { toast('主题已本地切换（后端未同步：' + e.message + '）'); }
  }
  async function initTheme() {
    // 旧版键迁移：meowpanel.theme（dark/light）→ meowpanel.mode
    const old = storageGet('meowpanel.theme');
    if (old) {
      if (!storedMode()) storageSet('meowpanel.mode', old === 'light' ? 'light' : 'dark');
      storageDel('meowpanel.theme');
    }
    applyTheme();
    // 浏览器日/夜切换：模式为 browser（或 system 且设备主题未知）时实时跟随
    try {
      if (window.matchMedia) {
        const mq = matchMedia('(prefers-color-scheme: dark)');
        const onChange = function () {
          const m = storedMode() || 'system';
          if (m === 'browser' || (m === 'system' && !state.devTheme)) applyTheme();
        };
        if (mq.addEventListener) mq.addEventListener('change', onChange);
        else if (mq.addListener) mq.addListener(onChange);
      }
    } catch (e) {}
    // 设备默认值（ui.style/display.theme）——未覆盖时的默认来源
    try {
      const t = await api('GET', '/api/theme');
      state.devStyle = (t.style === 'md3' || t.style === 'miuix') ? t.style : null;
      state.devTheme = (t.theme === 'light' || t.theme === 'dark') ? t.theme : null;
      applyTheme();
      if (state.route === 'settings') renderSettings();   // 刷新「主题」卡的设备当前值提示
    } catch (e) { /* 后端离线，保持本地/浏览器偏好 */ }
  }
  // 顶栏「风格 / 明暗」切换器：本面板覆盖（localStorage）+ 同步设备 settings.conf
  function bindThemeUi() {
    $('#style-seg').addEventListener('click', function (e) {
      const b = e.target.closest('.seg-btn'); if (!b) return;
      storageSet('meowpanel.style', b.dataset.style);
      applyTheme();
      sendTheme({ style: b.dataset.style });
    });
    $('#theme-seg').addEventListener('click', function (e) {
      const b = e.target.closest('.seg-btn'); if (!b) return;
      storageSet('meowpanel.mode', b.dataset.mode);   // 顶栏=显式明/暗
      applyTheme();
      sendTheme({ theme: b.dataset.mode });
    });
  }

  /* ---------------- 页面空态 / 错误提示 ---------------- */
  function emptyState(msg, code) {
    const t = code === 'NO_CARD' ? '未识别到 TF 卡' : (code === 'NOT_IMPLEMENTED' ? '该功能后端尚未实现' : msg);
    return '<div class="empty">' + esc(t) + '</div>';
  }
  function errText(e) {
    if (e && e.code === 'NO_CARD') return '未识别到 TF 卡';
    if (e && e.code === 'NOT_IMPLEMENTED') return '该功能后端尚未实现';
    return (e && e.message) ? e.message : '未知错误';
  }

  /* ---------------- 1. 性能页（2s 轮询 /api/perf） ---------------- */
  function barHtml(p) {
    p = pct(p);
    const c = p >= 90 ? 'danger' : (p >= 70 ? 'warn' : '');
    return '<div class="bar ' + c + '"><span style="width:' + p + '%"></span></div>';
  }
  function stat(label, valueHtml, sub, barPct) {
    return '<div class="stat"><div class="stat-label">' + esc(label) + '</div>' + valueHtml +
      (sub ? '<div class="stat-sub">' + sub + '</div>' : '') +
      (barPct != null ? barHtml(barPct) : '') + '</div>';
  }
  function renderPerfData(page, d) {
    const cpu = d.cpu || {};
    const mem = d.memory || {}, st = d.storage || {}, tf = d.tfcard || {}, tmp = d.temp;
    let h = '<div class="card"><h3 class="card-title">实时性能</h3>';
    h += '<div class="muted">运行时间：' + fmtUptime(d.uptime_sec) + '</div><div class="stat-grid">';
    h += stat('CPU', '<span class="stat-value">' + (cpu.usage == null ? '—' : +cpu.usage.toFixed(1)) + '<span class="stat-unit">%</span></span>',
      cpu.cores != null ? cpu.cores + ' 核 · 负载 ' + (cpu.load ? cpu.load.map(x => (+x).toFixed(2)).join(' / ') : '—') : '',
      cpu.usage || 0);
    const memP = mem.total ? (mem.used / mem.total) * 100 : 0;
    h += stat('内存', '<span class="stat-value">' + fmtBytes((mem.used || 0) * 1024) + '</span><span class="stat-unit">/ ' + fmtBytes((mem.total || 0) * 1024) + '</span>',
      '可用 ' + fmtBytes((mem.available || (mem.free || 0)) * 1024), memP);
    const stP = st.total ? (st.used / st.total) * 100 : 0;
    h += stat('存储 (rootfs)', '<span class="stat-value">' + fmtBytes((st.used || 0) * 1024) + '</span><span class="stat-unit">/ ' + fmtBytes((st.total || 0) * 1024) + '</span>', st.path || '', stP);
    if (tf) {
      if (tf.present) {
        const tfP = tf.total ? (tf.used / tf.total) * 100 : 0;
        h += stat('TF 卡', '<span class="stat-value">' + fmtBytes((tf.used || 0) * 1024) + '</span><span class="stat-unit">/ ' + fmtBytes((tf.total || 0) * 1024) + '</span>',
          fmtBytes((tf.avail || 0) * 1024) + ' 可用 · ' + (tf.filesystem || ''), tfP);
      } else {
        h += stat('TF 卡', '<span class="stat-value">未插卡</span>', '');
      }
    }
    const tmpCpu = tmp && tmp.cpu != null ? +tmp.cpu.toFixed(1) : null;
    h += stat('温度', '<span class="stat-value">' + (tmpCpu == null ? '—' : tmpCpu) + '<span class="stat-unit">℃</span></span>',
      tmp && tmp.board != null ? '板载 ' + (+tmp.board.toFixed(1)) + ' ℃' : '');
    h += '</div></div>';
    page.innerHTML = h;
  }
  async function fetchPerfOnce() {
    const page = $('#perf-page');
    if (!page || state.route !== 'perf') return;
    let d;
    try { d = await api('GET', '/api/perf'); }
    catch (e) { if (page && state.route === 'perf') page.innerHTML = emptyState('加载失败：' + errText(e), e.code); return; }
    if (state.route === 'perf') renderPerfData(page, d);
  }
  function stopPerf() { if (state.perfTimer) { clearInterval(state.perfTimer); state.perfTimer = null; } }
  function renderPerf() {
    $('#content').innerHTML = '<div class="page" id="perf-page"><p class="placeholder">加载中…</p></div>';
    if (state.perfTimer) stopPerf();
    fetchPerfOnce();
    state.perfTimer = setInterval(fetchPerfOnce, 2000);
  }

  /* ---------------- 2. 亮度 / 音量页 ---------------- */
  let volTimer = null;
  function slur(step) { // step: {key,label,min,max,val}
    return '<div class="card"><h3 class="card-title">' + esc(step.label) + '</h3>' +
      '<div class="field-row"><span class="muted" style="width:44px">' + step.val + '</span>' +
      '<input type="range" min="' + step.min + '" max="' + step.max + '" value="' + step.val + '" data-slider data-key="' + esc(step.key) + '">' +
      '<span class="muted" style="width:44px;text-align:right">' + step.max + '</span></div></div>';
  }
  async function renderBright() {
    $('#content').innerHTML = '<div class="page" id="bright-page"><p class="placeholder">加载设置…</p></div>';
    let bright, vol;
    try {
      bright = await api('GET', '/api/settings/display.brightness');
    } catch (e) { $('#content').innerHTML = emptyState('加载失败：' + errText(e), e.code); return; }
    try { vol = await api('GET', '/api/settings/audio.volume'); } catch (e) { vol = null; }
    if (state.route !== 'bright') return;
    let h = '<div class="page" id="bright-page">';
    h += slur({ key: 'display.brightness', label: '亮度', min: bright.min || 1, max: bright.max || 100, val: bright.value });
    if (vol) h += slur({ key: 'audio.volume', label: '音量', min: vol.min || 0, max: vol.max || 100, val: vol.value });
    else h += '<p class="muted">音量设置项不可用（后端未实现 audio.volume）</p>';
    h += '<p class="muted">滑条改动自动保存到系统（走 meow_settings_*），与实体设置页同步。</p></div>';
    $('#content').innerHTML = h;
  }
  const saveSetting = debounce(async function (key, value, type) {
    try {
      await api('PUT', '/api/settings/' + key, { value: value });
      toast('已保存 ' + key + ' = ' + value);
    } catch (e) { toast('保存失败：' + errText(e)); }
  }, 400);
  function bindSlider() {
    $('#content').addEventListener('input', function (e) {
      const r = e.target.closest('[data-slider]');
      if (!r) return;
      const row = r.closest('.field-row');
      if (row) row.querySelector('.muted').textContent = r.value;
      saveSetting(r.dataset.key, +r.value, 'int');
    });
  }

  /* ---------------- 2b. 音频页（meow_audiod 状态快照，1s 轮询，只读；含 rms/peak 电平可视化） ----------------
   * 电平：rms(青绿) + peak(黄) 双条 dBFS 表（-60..0 刻度）+ deci-dB 数值 + 近 30 采样 sparkline（客户端自累积）。
   * 短流时显示「无流」；audiod 不在 → available:false。 */
  let audioTimer = null;
  function stopAudio() { if (audioTimer) { clearInterval(audioTimer); audioTimer = null; } }
  function audioPortName(p) {   // audiod numid=9 路由口语义（AUDIOD_DESIGN §5）
    const m = { 0: '空闲', 1: 'Line Out', 2: '3.5mm', 3: '4.4mm 平衡', 4: 'Type-C SPDIF' };
    if (p == null || p < 0) return '—';
    return m[p] || ('端口 ' + p);
  }
  function fmtFrames(n) { return (n == null) ? '—' : Number(n).toLocaleString(); }
  function audioFlowHtml(d) {
    let h = '';
    if (!d || !d.available) {
      h += '<div class="card"><h3 class="card-title">音频服务（meow_audiod）</h3>' +
        '<p class="muted">audiod 不可用（服务未运行或 IPC 不可达）。MeowOS 模式下 audiod 恒在；HibyOS 模式下按门控不启动。</p></div>';
    } else {
      h += '<div class="card"><h3 class="card-title">当前流</h3>';
      if (d.active) {
        h += '<table class="table"><tbody>' +
          row('应用', esc(d.app || '—') + ' <span class="muted">(sid ' + esc(d.sid) + ')</span>') +
          row('采样率', esc(d.rate) + ' Hz') +
          row('声道', esc(d.ch) + ' ch') +
          row('格式', esc(d.fmt || '—')) +
          row('已写帧', fmtFrames(d.written_frames)) +
          row('已播放帧', fmtFrames(d.played_frames)) +
          row('underrun', '<span class="' + (d.underrun > 0 ? 'urgency-hi' : '') + '">' + esc(d.underrun) + '</span>') +
          row('状态', d.paused ? '已暂停' : '播放中') +
          '</tbody></table>';
      } else {
        h += '<p class="muted">当前无活动音频流。</p>';
      }
      h += '</div>';
      h += '<div class="card"><h3 class="card-title">路由与音量</h3><table class="table"><tbody>' +
        row('路由模式', esc(d.route_mode || '—') + (d.route_mode === 'manual' ? '（手动覆盖）' : '（跟随插孔）')) +
        row('输出口', audioPortName(d.port)) +
        row('音量', (d.vol != null && d.vol >= 0 ? esc(d.vol) + ' %' : '—')) +
        '</tbody></table></div>';
    }
    return h;
  }
  async function fetchAudioOnce() {
    const flowEl = $('#audio-flow');
    if (!flowEl || state.route !== 'audio') return;
    let d;
    try { d = await api('GET', '/api/audio'); }
    catch (e) {
      if (flowEl && state.route === 'audio') flowEl.innerHTML = '<div class="card"><div class="empty">加载失败：' + esc(errText(e)) + '</div></div>';
      return;
    }
    if (state.route !== 'audio') return;
    flowEl.innerHTML = audioFlowHtml(d);
    updateLevelMeter($('#audio-level'), d);
    const note = $('#audio-level-note');
    if (note) {
      if (!d || !d.available) note.innerHTML = 'audiod 不可用 · 每 1 秒自动刷新 · 只读展示。';
      else if (!d.active) note.innerHTML = '当前无流 · 电平保持 −∞ · 每 1 秒自动刷新。';
      else note.innerHTML = '每 1 秒自动刷新 · 只读展示（测试音请用设备 CLI <code>meow_audio tone</code>，面板不放声）。';
    }
  }
  function renderAudio() {
    resetSpark();   // 进入页面重置 sparkline 累积
    stopAudio();
    $('#content').innerHTML =
      '<div class="page" id="audio-page">' +
        '<div id="audio-flow"><p class="placeholder">加载音频状态…</p></div>' +
        '<div class="card"><h3 class="card-title">电平（dBFS）</h3>' +
          '<div id="audio-level">' + levelMeterHtml() + '</div>' +
          '<p class="muted" id="audio-level-note">每 1 秒自动刷新 · 只读展示（测试音请用设备 CLI <code>meow_audio tone</code>，面板不放声）。</p>' +
        '</div>' +
      '</div>';
    fetchAudioOnce();
    audioTimer = setInterval(fetchAudioOnce, 1000);
  }

  /* ---------------- 2d. 首页仪表盘（#/home，默认路由；/api/overview 聚合，5s 节拍 + 电平 1s 子节拍） ----------------
   * 单请求 /api/overview 供全部卡片；另低频补充 /api/system（boot/默认启动，静态）+ /api/net/dns（DNS 上游/缓存）。
   * 任一源 available:false / 缺失 → 该卡显示「—」，绝不拖垮其它卡。 */
  let homeTimer = null, homeLevelTimer = null;
  let homeData = null, homeDns = null, homeSys = null;
  function stopHome() {
    if (homeTimer) { clearInterval(homeTimer); homeTimer = null; }
    if (homeLevelTimer) { clearInterval(homeLevelTimer); homeLevelTimer = null; }
  }
  /* 设备信息卡：版本/hostname/内核/架构/运行模式/默认启动（boot 来自 /api/system 一次性拉取） */
  function deviceCard() {
    const p = (homeData && homeData.perf && homeData.perf.system);
    const s = homeSys;
    const ver = (s && s.version) || (p && p.version) || '—';
    const host = (s && s.hostname) || (p && p.hostname) || '—';
    const ker = (s && s.kernel) || (p && p.kernel) || '—';
    const arch = (s && s.arch) || (p && p.arch) || '—';
    const bootD = (s && s.boot && s.boot.default) || '—';
    const cur = (s && s.boot) ? (s.boot.mode || s.boot.current || null) : null;
    let rows = '';
    rows += homeKv('版本', esc(ver));
    rows += homeKv('主机名', esc(host));
    rows += homeKv('内核', esc(ker));
    rows += homeKv('架构', esc(arch));
    rows += homeKv('运行模式', modePill(cur));
    rows += homeKv('默认启动', modePill(bootD));
    return homeCard('设备信息', '<div class="home-card-grid">' + rows + '</div>');
  }
  function batteryCard() {
    const pw = homeData && homeData.power;
    if (!isAvail(pw)) return homeCard('电量 / 充电', homeUnavailable());
    const b = pw.battery || {};
    const pct = (b.pct != null) ? b.pct : null;
    const state = b.state || '—';
    const charging = (state === 'Charging' || state === 'Full');
    const fillCls = (!pct) ? '' : (pct >= 85 ? 'charge' : (pct <= 20 ? 'bad' : ''));
    let inner = '<div class="batt"><span class="batt-icon"><span class="lvl-fill ' + fillCls + '" style="width:' + (pct == null ? 0 : pct) + '%"></span></span>' +
      '<span class="home-bigval">' + (pct == null ? '—' : pct) + '</span><span class="home-bigunit">%</span>' +
      '<span class="home-chip ' + (charging ? 'ok' : 'mut') + '">' + esc(state) + '</span></div>';
    inner += '<div class="home-card-grid">' +
      homeKv('电压', b.mv != null ? (b.mv / 1000).toFixed(2) + ' V' : '—') +
      homeKv('健康', b.health ? esc(b.health) : '—') +
      homeKv('温度', b.temp_c10 != null ? (b.temp_c10 / 10).toFixed(1) + ' ℃' : '—') +
      (b.est_minutes_left != null ? homeKv('续航估算', b.est_minutes_left + ' 分钟') :
        (b.est_minutes_full != null ? homeKv('充满估算', b.est_minutes_full + ' 分钟') : '')) +
      '</div>';
    return homeCard('电量 / 充电', inner);
  }
  function audioCard() {
    const ad = homeData && homeData.audio;
    if (!isAvail(ad)) return homeCard('音频', homeUnavailable());
    let body = '';
    if (ad.active) {
      body += '<div class="home-card-grid">' +
        homeKv('流', esc(ad.app || '—') + ' · ' + esc(ad.rate) + 'Hz ' + esc(ad.fmt || '')) +
        homeKv('输出口', audioPortName(ad.port)) +
        homeKv('音量', (ad.vol != null && ad.vol >= 0 ? esc(ad.vol) + ' %' : '—')) +
        '</div>';
    } else {
      body += '<div class="home-sub">当前无活跃音频流。</div>';
    }
    body += '<div id="home-audio-level">' + levelMeterHtml() + '</div>' +
      '<p class="muted" id="home-audio-note">' + (ad.active ? '电平 · 1s 子节拍' : '无流') + '</p>';
    return homeCard('音频', body);
  }
  function netCard() {
    const nd = homeData && homeData.net;
    if (!isAvail(nd)) return homeCard('WiFi / DNS', homeUnavailable());
    const w = nd.wifi || {};
    const dn = homeDns;
    let rows = '';
    rows += homeKv('WiFi', w.connected ? ('<span class="home-chip ok">已连接</span> ' + esc(w.ssid || '')) : '<span class="home-chip warn">未连接</span>');
    if (w.connected) {
      rows += homeKv('IP', esc(w.ip || '—'));
      rows += homeKv('信号', (w.rssi != null ? esc(w.rssi) + ' dBm' : '—'));
    }
    if (dn) {
      rows += homeKv('DNS 上游', esc(dn.upstream || '—'));
      rows += homeKv('DNS 缓存', (dn.cache_hits || 0) + ' / ' + (dn.cache_total || 0) + (dn.enabled ? '' : '（停用）'));
    } else {
      rows += homeKv('DNS', '<span class="home-chip mut">—</span>');
    }
    return homeCard('WiFi / DNS', '<div class="home-card-grid">' + rows + '</div>');
  }
  function healthCard() {
    const ams = homeData && homeData.ams;
    const svcd = homeData && homeData.svcd;
    let appTxt = '—', svcBad = 0, svcHi = 0, svcTxt = '—';
    if (isAvail(ams)) {
      const apps = ams.apps || [];
      const run = apps.filter(a => a.state === 'fg' || a.state === 'bg').length;
      appTxt = run + ' 在跑 / ' + (ams.count || apps.length) + ' 已装';
    }
    let svcHtml;
    if (isAvail(svcd)) {
      const svcs = svcd.services || [];
      svcBad = svcs.filter(s => s.state === 'failed').length;
      svcHi = svcs.filter(s => (s.restart || 0) >= 3).length;
      svcTxt = svcs.filter(s => s.state === 'running').length + ' 运行中';
      svcHtml = '';
      if (svcBad) svcHtml += '<span class="home-chip bad">' + svcBad + ' FAILED</span> ';
      if (svcHi) svcHtml += '<span class="home-chip warn">' + svcHi + ' 高重启</span> ';
      if (!svcBad && !svcHi) svcHtml += '<span class="home-chip ok">正常</span> ';
    } else {
      svcHtml = '<span class="home-chip mut">不可用</span> ';
      svcTxt = '—';
    }
    return homeCard('在跑 App 与服务', '<div class="home-card-grid">' +
      homeKv('在跑 App', esc(appTxt)) + homeKv('服务健康', svcHtml + esc(svcTxt)) + '</div>');
  }
  function storageCard() {
    const perf = homeData && homeData.perf;
    if (!isAvail(perf)) return homeCard('存储', homeUnavailable());
    const st = perf.storage || {}, tf = perf.tfcard || {};
    let rows = homeKv('rootfs', (st.used != null ? fmtBytes(st.used * 1024) : '—') + ' / ' + (st.total != null ? fmtBytes(st.total * 1024) : '—'));
    rows += (tf.present) ?
      homeKv('TF 卡', fmtBytes((tf.used || 0) * 1024) + ' / ' + fmtBytes((tf.total || 0) * 1024)) :
      homeKv('TF 卡', '<span class="home-chip mut">未插卡</span>');
    return homeCard('存储', '<div class="home-card-grid">' + rows + '</div>');
  }
  function perfCard() {
    const perf = homeData && homeData.perf;
    if (!isAvail(perf)) return homeCard('性能小条', homeUnavailable());
    const cpu = perf.cpu || {}, mem = perf.memory || {}, tmp = perf.temp || {};
    const cpuU = cpu.usage;
    const memP = mem.total ? (mem.used / mem.total) * 100 : 0;
    return homeCard('性能小条', '<div class="stat-grid" style="grid-template-columns:repeat(auto-fill,minmax(120px,1fr))">' +
      '<div class="stat"><div class="stat-label">CPU</div><div class="stat-value">' + (cpuU == null ? '—' : (+cpuU).toFixed(1)) + '<span class="stat-unit">%</span></div>' + barHtml(cpuU || 0) + '</div>' +
      '<div class="stat"><div class="stat-label">内存</div><div class="stat-value">' + (mem.total ? fmtBytes(mem.used * 1024) : '—') + '</div>' + barHtml(mem.used && mem.total ? memP : 0) + '</div>' +
      '<div class="stat"><div class="stat-label">温度</div><div class="stat-value">' + (tmp.cpu != null ? (+tmp.cpu).toFixed(1) + '<span class="stat-unit">℃</span>' : '—') + '</div></div>' +
      '</div>');
  }
  function renderHomeCards() {
    const body = $('#home-body');
    if (!body || state.route !== 'home') return;
    if (!homeData) { body.innerHTML = '<p class="placeholder">加载总览…</p>'; return; }
    let h = '<div class="home-grid">' +
      deviceCard() + batteryCard() + audioCard() + netCard() + healthCard() + storageCard() + perfCard() +
      '</div>';
    body.innerHTML = h;
    const ad = homeData.audio;
    if (isAvail(ad)) updateLevelMeter($('#home-audio-level'), ad);
  }
  async function fetchHomeSystem() {   // 静态设备信息（boot/默认启动）；进入时拉一次，失败不阻塞
    try { homeSys = await api('GET', '/api/system'); } catch (e) { homeSys = null; }
    if (state.route === 'home') renderHomeCards();
  }
  async function fetchHomeLevel() {   // 电平 1s 子节拍（独立于 overview 5s）
    if (state.route !== 'home') return;
    const el = $('#home-audio-level'); if (!el) return;
    let d;
    try { d = await api('GET', '/api/audio'); } catch (e) { return; }
    if (state.route !== 'home') return;
    updateLevelMeter(el, d);
    const note = $('#home-audio-note');
    if (note) note.textContent = (!d || !d.available) ? 'audiod 不可用' : (d.active ? '电平 · 1s 子节拍' : '无流');
  }
  async function fetchOverviewOnce() {
    if (state.route !== 'home') return;
    const r = await Promise.allSettled([api('GET', '/api/net/dns'), api('GET', '/api/overview')]);
    if (r[1].status !== 'fulfilled') {
      const b = $('#home-banner');
      if (b) {
        b.innerHTML = '<span class="ico">⚠️</span><span>总览加载失败：' + esc(errText(r[1].reason)) + '</span><button class="btn" id="home-retry">重试</button>';
        b.hidden = false;
      }
      return;
    }
    const b = $('#home-banner'); if (b) { b.hidden = true; b.innerHTML = ''; }
    homeDns = (r[0].status === 'fulfilled') ? r[0].value : null;
    homeData = r[1].value;
    renderHomeCards();
  }
  function renderHome() {
    stopHome();
    resetSpark();          // 进入首页重置 sparkline 累积
    homeData = null; homeDns = null; homeSys = null;
    $('#content').innerHTML =
      '<div class="page" id="home-page">' +
        '<div id="home-banner" class="page-banner" hidden></div>' +
        '<div id="home-body"><p class="placeholder">加载总览…</p></div>' +
      '</div>';
    fetchHomeSystem();
    fetchOverviewOnce();
    homeTimer = setInterval(fetchOverviewOnce, 5000);
    homeLevelTimer = setInterval(fetchHomeLevel, 1000);
  }
  function bindHome() {
    $('#content').addEventListener('click', function (e) {
      if (e.target.closest('#home-retry')) { fetchOverviewOnce(); return; }
    });
  }

  /* ---------------- 2e. 电源 / 功耗页（#/power；/api/power，只读） ----------------
   * 电池卡 + 功耗估算卡（est_mw + confidence 徽标，必须如实标注）+ 子系统分解堆叠条。 */
  let powerTimer = null;
  function stopPower() { if (powerTimer) { clearInterval(powerTimer); powerTimer = null; } }
  function batteryCardBody(b) {
    if (!b) return homeUnavailable();
    const pct = (b.pct != null) ? b.pct : null;
    const state = b.state || '—';
    const charging = (state === 'Charging' || state === 'Full');
    const fillCls = (!pct) ? '' : (pct >= 85 ? 'charge' : (pct <= 20 ? 'bad' : ''));
    let h = '<div class="batt"><span class="batt-icon"><span class="lvl-fill ' + fillCls + '" style="width:' + (pct == null ? 0 : pct) + '%"></span></span>' +
      '<span class="home-bigval">' + (pct == null ? '—' : pct) + '</span><span class="home-bigunit">%</span>' +
      '<span class="home-chip ' + (charging ? 'ok' : 'mut') + '">' + esc(state) + '</span></div>';
    h += '<table class="table"><tbody>' +
      row('电压', b.mv != null ? (b.mv / 1000).toFixed(2) + ' V' : '—') +
      row('健康', b.health ? esc(b.health) : '—') +
      row('技术', b.technology ? esc(b.technology) : '—') +
      row('电池温度', b.temp_c10 != null ? (b.temp_c10 / 10).toFixed(1) + ' ℃' : '—') +
      row('充电器温度', b.charger_temp_c10 != null ? (b.charger_temp_c10 / 10).toFixed(1) + ' ℃' : '—') +
      row('循环次数', b.cycle_count != null ? b.cycle_count : '—') +
      row('放电速率', b.rate_pct_min_x100 != null ? ((b.rate_pct_min_x100 / 100).toFixed(2) + ' %/min') : '—') +
      row('续航估算', b.est_minutes_left != null ? (b.est_minutes_left + ' 分钟（剩余）') : (b.est_minutes_full != null ? (b.est_minutes_full + ' 分钟（充满）') : '—')) +
      '</tbody></table>';
    return h;
  }
  function estimateCardBody(est) {
    if (!est) return homeUnavailable();
    if (est.est_mw == null) return '<div class="home-sub">' + (est.degraded ? '功耗估算不可用（HibyOS 只读模式）' : '—') + '</div>';
    const conf = est.confidence || 'estimated';
    const cls = conf === 'measured' ? 'measured' : (conf === 'derived' ? 'derived' : (conf === 'none' ? 'none' : 'estimated'));
    return '<div class="up-strip"><span class="home-bigval">' + est.est_mw + '</span><span class="home-bigunit">mW</span>' +
      '<span class="conf-badge ' + cls + '">' + esc(conf) + (est.calibrated ? ' · 已标定' : ' · 经验值') + '</span></div>' +
      '<p class="muted">Model 系数全部为经验初值（未真机标定）；confidence 必须如实标注。</p>';
  }
  function breakdownCardBody(bd) {
    if (!bd) return homeUnavailable();
    if (bd.degraded) return '<div class="home-sub">系统分解不可用（HibyOS 只读模式）</div>';
    const comps = [
      { label: '屏幕(背光)', mw: bd.backlight_mw, color: '#4a8bf5' },
      { label: 'WiFi', mw: bd.wifi_mw, color: '#00bfa5' },
      { label: '蓝牙', mw: bd.bt_mw, color: '#ab47bc' },
      { label: '音频', mw: bd.audio_mw, color: '#ffb300' },
      { label: 'CPU', mw: bd.cpu_mw, color: '#ff7043' },
      { label: '基线', mw: bd.baseline_mw, color: '#8d6e63' }
    ].filter(c => c.mw != null && c.mw >= 0);
    const total = comps.reduce((a, c) => a + c.mw, 0);
    let stack = '<div class="stack">';
    comps.forEach(c => { stack += '<span style="width:' + (total > 0 ? (c.mw / total * 100) : 0) + '%;background:' + c.color + '" title="' + esc(c.label) + ': ' + c.mw + ' mW (' + (total > 0 ? (c.mw / total * 100).toFixed(1) : '0') + '%)"></span>'; });
    stack += '</div>';
    let legend = '<div class="stack-legend">';
    comps.forEach(c => {
      legend += '<span class="seg"><span class="sw" style="background:' + c.color + '"></span>' + esc(c.label) + ' ' + c.mw + ' mW (' + (total > 0 ? (c.mw / total * 100).toFixed(1) : '0') + '%)</span>';
    });
    legend += '</div>';
    if (bd.cpu_util_pct != null || bd.brightness_pct != null || bd.wifi_state || bd.bt_state || bd.audio_state) {
      legend += '<p class="muted">' +
        (bd.cpu_util_pct != null ? 'CPU 利用率 ' + esc(bd.cpu_util_pct) + '% ' : '') +
        (bd.brightness_pct != null ? '· 亮度 ' + esc(bd.brightness_pct) + '% ' : '') +
        (bd.wifi_state ? '· WiFi ' + esc(bd.wifi_state) : '') +
        (bd.bt_state ? ' · BT ' + esc(bd.bt_state) : '') +
        (bd.audio_state ? ' · 音频 ' + esc(bd.audio_state) : '') + '</p>';
    }
    return '<div class="home-sub">合计 ' + total + ' mW（分解为经验估算）</div>' + stack + legend;
  }
  function renderPowerBody(d) {
    let h = '<div class="page" id="power-page">';
    if (d && d.mode === 'readonly') h += '<div class="page-banner"><span class="ico">ℹ️</span><span>当前为电源只读观测（HibyOS 模式），仅显示电池采样，无功耗估算/分解。</span></div>';
    h += '<div class="card"><h3 class="card-title">电池</h3>' + ((d && d.battery) ? batteryCardBody(d.battery) : homeUnavailable()) + '</div>';
    h += '<div class="card"><h3 class="card-title">功耗估算</h3>' + ((d && d.estimate) ? estimateCardBody(d.estimate) : homeUnavailable()) + '</div>';
    h += '<div class="card"><h3 class="card-title">子系统分解</h3>' + ((d && d.breakdown) ? breakdownCardBody(d.breakdown) : homeUnavailable()) + '</div>';
    if (d && d.policy == null) h += '<p class="muted" style="margin-top:6px">电源策略（profile 四档/低电阈值）为 期3 功能，此处以不可用占位。</p>';
    h += '</div>';
    return h;
  }
  async function fetchPowerOnce() {
    const el = $('#power-page');
    if (!el || state.route !== 'power') return;
    let d;
    try { d = await api('GET', '/api/power'); }
    catch (e) { if (el && state.route === 'power') el.innerHTML = '<div class="page" id="power-page">' + emptyState('加载失败：' + errText(e), e.code) + '</div>'; return; }
    if (state.route !== 'power') return;
    el.innerHTML = renderPowerBody(d);
  }
  function renderPower() {
    stopPower();
    $('#content').innerHTML = '<div class="page" id="power-page"><p class="placeholder">加载电源数据…</p></div>';
    fetchPowerOnce();
    powerTimer = setInterval(fetchPowerOnce, 5000);
  }

  /* ---------------- 2f. 进程 / 服务页（#/proc；/api/svcd + /api/ams，只读，无 restart/kill） ----------------
   * svcd 服务表（state/pid/restart 计数≥3 高亮/exec/来源 board|tf）+ ams App 表（state/pid/crashes/launches/last_kind）；
   * 行点开经 /api/files 列 MeowOS/logs/<pkg>/ 找最新 stdout_*.log，再用 /api/logs/read 读尾部（崩溃尾巴）。 */
  let procTimer = null;
  let expandedProc = null;   // { pkg, file, lines, truncated }：已展开的 App stdout 尾部（重渲染后重开，防轮询清空）
  function stopProc() { if (procTimer) { clearInterval(procTimer); procTimer = null; } }
  function svcStatePill(s) {
    const map = { running: ['ok', '运行'], stopped: ['mut', '已停'], stopping: ['warn', '停止中'], disabled: ['mut', '禁用'], failed: ['bad', '失败'] };
    const m = map[s] || ['mut', s || '—'];
    return '<span class="h-pill ' + m[0] + '">' + esc(m[1]) + '</span>';
  }
  function appStatePill(s) {
    const map = { fg: ['ok', '前台'], bg: ['warn', '后台'], stop: ['mut', '已停'] };
    const m = map[s] || ['mut', s || '—'];
    return '<span class="h-pill ' + m[0] + '">' + esc(m[1]) + '</span>';
  }
  function srcPill(src) {
    const cls = (src === 'board') ? 'board' : (src === 'tf' ? 'tf' : '');
    return src ? '<span class="proc-badge ' + cls + '">' + esc(src) + '</span>' : '—';
  }
  function renderProcBody(ams, svcd) {
    let h = '<div class="page" id="proc-page">';
    h += '<div class="card"><h3 class="card-title">服务（meow_svcd）</h3>';
    if (svcd && svcd.available) {
      const svcs = svcd.services || [];
      h += '<table class="table"><thead><tr><th>服务</th><th>状态</th><th>PID</th><th>重启</th><th>退避</th><th>触发</th><th>来源</th><th>退出</th><th>执行</th></tr></thead><tbody>';
      if (!svcs.length) h += '<tr><td colspan="9" class="empty">暂无服务</td></tr>';
      svcs.forEach(s => {
        h += '<tr><td class="mono">' + esc(s.name) + '</td>' +
          '<td>' + svcStatePill(s.state) + '</td>' +
          '<td>' + (s.pid > 0 ? esc(s.pid) : '—') + '</td>' +
          '<td class="' + ((s.restart || 0) >= 3 ? 'restart-hi' : 'muted') + '">' + (s.restart || 0) + ((s.restart || 0) >= 3 ? ' ⚠' : '') + '</td>' +
          '<td class="muted">' + esc(s.backoff_ms || '—') + '</td>' +
          '<td class="muted">' + esc(s.trigger || '—') + '</td>' +
          '<td>' + srcPill(s.src) + '</td>' +
          '<td class="muted">' + esc(s.exit || '—') + '</td>' +
          '<td class="mono muted">' + esc(s.exec || '—') + '</td></tr>';
      });
      h += '</tbody></table>';
    } else h += homeUnavailable();
    h += '</div>';
    h += '<div class="card"><h3 class="card-title">App（meow_amsd，只读）</h3>';
    if (ams && ams.available) {
      const apps = ams.apps || [];
      h += '<table class="table"><thead><tr><th>包名</th><th>名称</th><th>状态</th><th>PID</th><th>启动</th><th>崩溃</th><th>上次退出</th><th style="text-align:right">操作</th></tr></thead><tbody>';
      if (!apps.length) h += '<tr><td colspan="8" class="empty">无可观测 App</td></tr>';
      apps.forEach(a => {
        const openHere = expandedProc && expandedProc.pkg === a.pkg;
        h += '<tr><td class="mono">' + esc(a.pkg) + '</td><td>' + esc(a.name || '—') + '</td>' +
          '<td>' + appStatePill(a.state) + '</td><td>' + (a.pid > 0 ? esc(a.pid) : '—') + '</td>' +
          '<td class="muted">' + esc(a.launches || 0) + '</td>' +
          '<td class="' + ((a.crashes || 0) > 0 ? 'crash-hi' : 'muted') + '">' + (a.crashes || 0) + ((a.crashes || 0) > 0 ? ' ⚠' : '') + '</td>' +
          '<td class="muted">' + esc(a.last_kind || '—') + (a.last_code != null && a.last_code !== 0 ? ' (' + esc(a.last_code) + ')' : '') + '</td>' +
          '<td><div class="row-actions"><button class="btn btn-ghost" data-applog="' + esc(a.pkg) + '">' + (openHere ? '收起' : 'stdout 尾部') + '</button></div></td></tr>';
        if (openHere) {
          const lines = (expandedProc.lines || []);
          h += '<tr class="proc-tail"><td colspan="8"><pre class="log-view">' + esc(lines.join('\n') || '(空)') +
            (expandedProc.truncated ? '\n…（超出尾部上限，部分被截断）' : '') + '</pre>' +
            '<div class="muted">' + esc(a.pkg + '/' + expandedProc.file) + ' · 末尾 ' + lines.length + ' 行</div></td></tr>';
        }
      });
      h += '</tbody></table>';
      h += '<p class="muted">点击「stdout 尾部」查看该 App 最新 stdout_*.log 末尾（崩溃尾巴）。仅只读，无 restart/kill。</p>';
    } else h += homeUnavailable();
    h += '</div></div>';
    return h;
  }
  async function newestStdout(pkg) {
    try {
      const d = await api('GET', '/api/files?path=' + encodeURIComponent('/MeowOS/logs/' + pkg + '/'));
      const files = (d.items || []).filter(f => f.type === 'file' && f.name && f.name.indexOf('stdout_') === 0);
      if (!files.length) return null;
      files.sort((a, b) => (b.mtime || 0) - (a.mtime || 0));
      return files[0].name;
    } catch (e) { return null; }
  }
  async function viewAppStdout(pkg, btn) {
    const row = btn.closest('tr'); if (!row) return;
    const next = row.nextElementSibling;
    if (next && next.classList && next.classList.contains('proc-tail')) { next.remove(); expandedProc = null; btn.textContent = 'stdout 尾部'; return; }
    if (expandedProc && expandedProc.pkg !== pkg) {   // 先收起上一个 opened
      const prevTail = document.querySelector('tr.proc-tail');
      if (prevTail) prevTail.remove();
      const prevBtn = document.querySelector('[data-applog="' + escSafeAttr(expandedProc.pkg) + '"]');
      if (prevBtn) prevBtn.textContent = 'stdout 尾部';
      expandedProc = null;
    }
    btn.textContent = '加载中…';
    const tailTr = document.createElement('tr');
    tailTr.className = 'proc-tail';
    tailTr.innerHTML = '<td colspan="8"><div class="muted">读取 ' + esc(pkg) + ' 最新 stdout…</div></td>';
    row.after(tailTr);
    try {
      const file = await newestStdout(pkg);
      if (!file) { tailTr.innerHTML = '<td colspan="8"><div class="empty">未找到 ' + esc(pkg) + ' 的 stdout 日志</div></td>'; btn.textContent = 'stdout 尾部'; return; }
      const d = await api('GET', '/api/logs/read?file=' + encodeURIComponent(pkg + '/' + file) + '&lines=200');
      const lines = (d.lines || []);
      expandedProc = { pkg: pkg, file: file, lines: lines, truncated: !!d.truncated };
      tailTr.innerHTML = '<td colspan="8"><pre class="log-view">' + esc(lines.join('\n') || '(空)') + (d.truncated ? '\n…（超出尾部上限，部分被截断）' : '') + '</pre>' +
        '<div class="muted">' + esc(pkg + '/' + file) + ' · 末尾 ' + lines.length + ' 行</div></td>';
      btn.textContent = '收起';
    } catch (err) {
      tailTr.innerHTML = '<td colspan="8"><div class="empty">读取失败：' + esc(errText(err)) + '</div></td>';
      btn.textContent = 'stdout 尾部';
    }
  }
  function escSafeAttr(s) { return String(s == null ? '' : s).replace(/[&<>"']/g, m => ({ '&': '&amp;', '<': '&lt;', '>': '&gt;', '"': '&quot;', "'": '&#39;' }[m])); }
  async function fetchProcOnce() {
    const el = $('#proc-page');
    if (!el || state.route !== 'proc') return;
    const r = await Promise.allSettled([api('GET', '/api/ams'), api('GET', '/api/svcd')]);
    if (state.route !== 'proc') return;
    if (r[0].status !== 'fulfilled' && r[1].status !== 'fulfilled') {
      el.innerHTML = '<div class="page" id="proc-page">' + emptyState('加载失败：' + errText(r[0].reason || r[1].reason)) + '</div>';
      return;
    }
    el.innerHTML = renderProcBody(r[0].status === 'fulfilled' ? r[0].value : null, r[1].status === 'fulfilled' ? r[1].value : null);
  }
  function renderProc() {
    stopProc();
    $('#content').innerHTML = '<div class="page" id="proc-page"><p class="placeholder">加载服务与进程…</p></div>';
    fetchProcOnce();
    procTimer = setInterval(fetchProcOnce, 5000);
  }
  function bindProc() {
    $('#content').addEventListener('click', function (e) {
      const b = e.target.closest('[data-applog]'); if (!b) return;
      viewAppStdout(b.dataset.applog, b);
    });
  }

  /* ---------------- 2c. 网络管理页（meow_netmgrd 期2 面板侧） ----------------
   * 数据源：GET /api/net/status（E0 接口+WiFi/BT 摘要）、/api/net/conns?entity=（E8 连接表）、
   * /api/net/dns（EC DNS 统计）、/api/net/dns/flush（EC flush 写级）、/api/net/log（net_*.log tail）。
   * netmgrd 不在 → 后端 503（NET_UNAVAILABLE）→ 本页显示「网络管理服务不可用」占位，不白屏。
   * status 成功即开始 5s 轮询（接口/WiFi/BT + 连接表 + DNS 统计）；日志仅在进入页面/点「刷新」时拉取。 */
  let netTimer = null;
  let netEntityFilter = '';
  function stopNet() { if (netTimer) { clearInterval(netTimer); netTimer = null; } }
  function fmtDur(sec) {   // 连接寿命（秒级精度）
    if (sec == null || isNaN(sec)) return '—';
    sec = Math.floor(sec);
    if (sec < 60) return sec + ' 秒';
    const m = Math.floor(sec / 60), s = sec % 60;
    if (m < 60) return m + ' 分 ' + s + ' 秒';
    const h = Math.floor(m / 60), mm = m % 60;
    return h + ' 时 ' + mm + ' 分';
  }

  function netBadge(e) {
    const i = e.indexOf(':');
    const kind = i > 0 ? e.slice(0, i) : 'proc';
    return '<span class="net-badge ' + esc(kind) + '">' + esc(kind) + '</span>' +
      (i > 0 ? ' <span class="net-entity">' + esc(e.slice(i + 1)) + '</span>' : '');
  }
  function netStateCls(st) {
    if (!st) return '';
    if (st === 'ESTABLISHED') return 'net-state ok';
    if (st === 'LISTEN') return 'net-state listen';
    if (st === 'UDP') return 'net-state listen';
    return 'net-state warn';
  }

  function netStatusCards(d) {
    let h = '';
    // 接口卡（lo/wlan0/usb-eth：状态+IP+速率）
    const ifs = (d && d.ifaces) || [];
    h += '<div class="card"><h3 class="card-title">网络接口</h3><table class="table"><thead>' +
      '<tr><th>接口</th><th>类型</th><th>状态</th><th>IP 地址</th><th>网关</th><th>RX / TX</th></tr></thead><tbody>';
    if (!ifs.length) h += '<tr><td colspan="6" class="empty">无接口数据</td></tr>';
    ifs.forEach(function (f) {
      const up = !!f.up;
      h += '<tr><td class="mono">' + esc(f.name) + '</td><td><span class="net-kind">' + esc(f.kind || '—') + '</span></td>' +
        '<td><span class="net-state ' + (up ? 'ok' : 'down') + '">' + (up ? 'UP' : 'DOWN') + '</span></td>' +
        '<td class="mono">' + esc(f.ip || '—') + '</td><td class="mono">' + esc(f.gw || '—') + '</td>' +
        '<td class="muted">' + fmtBytes(f.rx_bytes) + ' / ' + fmtBytes(f.tx_bytes) + '</td></tr>';
    });
    h += '</tbody></table>';
    if (d && d.rate && (d.rate.rx_bps != null || d.rate.tx_bps != null))
      h += '<p class="muted">实时速率：↓ ' + fmtBytes(d.rate.rx_bps) + '/s · ↑ ' + fmtBytes(d.rate.tx_bps) + '/s</p>';
    h += '</div>';
    // WiFi 摘要
    const w = (d && d.wifi) || {};
    h += '<div class="card"><h3 class="card-title">WiFi</h3><table class="table"><tbody>';
    if (w.connected) {
      h += row('SSID', '<span class="net-entity">' + esc(w.ssid || '—') + '</span>');
      h += row('状态', '<span class="net-state ok">' + esc(w.state || '已连接') + '</span>');
      h += row('IP', esc(w.ip || '—'));
      h += row('信号', (w.rssi != null ? esc(w.rssi) + ' dBm' : '—'));
    } else {
      h += row('状态', '<span class="net-state warn">未连接</span>');
    }
    h += '</tbody></table></div>';
    // 蓝牙摘要
    const bt = (d && d.bt) || {};
    h += '<div class="card"><h3 class="card-title">蓝牙</h3><table class="table"><tbody>';
    if (bt.available) {
      h += row('状态', '<span class="net-state ' + (bt.powered ? 'ok' : 'warn') + '">' + (bt.powered ? '已开启' : '已关闭') + '</span>');
      h += row('地址', esc(bt.address || '—'));
      h += row('已配对', esc(bt.paired != null ? bt.paired : '—'));
      h += row('DNS', esc(((bt.dns) || []).join(' / ') || '—'));
    } else {
      h += row('状态', '<span class="net-state warn">无蓝牙</span>');
    }
    h += '</tbody></table></div>';
    return h;
  }

  function netConnsBody(cn) {
    const list = (cn && cn.conns) || [];
    let h = '';
    if (!list.length) h += '<div class="empty">暂无连接' + (netEntityFilter ? '（该实体）' : '') + '</div>';
    else {
      h += '<table class="table"><thead><tr><th>实体</th><th>远端（域名）</th><th>本端</th><th>状态</th><th>寿命</th></tr></thead><tbody>';
      list.forEach(function (c) {
        h += '<tr><td class="net-entity">' + netBadge(c.entity) + '</td>' +
          '<td class="mono">' + esc(c.domain || c.remote || '—') + '</td>' +
          '<td class="mono muted">' + esc(c.local || '—') + '</td>' +
          '<td><span class="' + netStateCls(c.state) + '">' + esc(c.state || '—') + '</span></td>' +
          '<td class="muted">' + fmtDur(c.age) + '</td></tr>';
      });
      h += '</tbody></table>';
      if (cn.truncated) h += '<p class="muted">连接表超出单帧上限，已截断（' + (cn.count || list.length) + ' 条）</p>';
    }
    return h;
  }

  function netDnsBody(dn) {
    if (!dn) return '<div class="empty">DNS 代理不可用</div>';
    let h = '<table class="table"><tbody>' +
      row('状态', '<span class="net-state ' + (dn.enabled ? 'ok' : 'warn') + '">' + (dn.enabled ? '已启用' : '已停用') + '</span>') +
      row('模式', esc(dn.mode || '—')) +
      row('上游', esc(dn.upstream || '—')) +
      row('缓存', (dn.cache_hits || 0) + ' / ' + (dn.cache_total || 0)) +
      row('查询数', esc(dn.queries)) +
      row('拦截 (deny)', esc(dn.denies)) +
      row('首次域名', esc(dn.first_seen)) +
      row('resolv.conf', (dn.resolv_modified ? '<span class="muted">已被代理改写</span>' : '未改写')) +
      '</tbody></table>';
    h += '<p class="muted">写操作（清缓存）需系统身份，面板路径可能被 netmgrd 拒绝。</p>';
    return h;
  }

  // 网络状态（/api/net/status）瞬态失败 → 仅顶部内联错误条，不整页踢「不可用」占位；保留上次成功内容，5s 自动重试。
  function netBannerErr(msg) {
    const nb = $('#net-banner');
    if (!nb) return;
    nb.innerHTML = '<span class="ico">⚠️</span><span>网络状态获取失败：' + esc(msg) + '（保留上次内容，5 秒后自动重试）</span>' +
      '<button class="btn" id="net-banner-retry">重试</button>';
    nb.hidden = false;
  }

  let netLoaded = false;   // 是否已成功加载过一次网络状态（用于「首次失败只显示横幅 + 占位」语义）
  async function fetchNetOnce() {
    if (state.route !== 'net') return;
    const stEl = $('#net-status'), cbEl = $('#net-conns-body'), dbEl = $('#net-dns-body');
    let st, cn, dn;
    try { st = await api('GET', '/api/net/status'); }
    catch (e) { netBannerErr(errText(e)); return; }
    netLoaded = true;
    const nb = $('#net-banner'); if (nb) { nb.hidden = true; nb.innerHTML = ''; }
    try { cn = await api('GET', '/api/net/conns' + (netEntityFilter ? '?entity=' + encodeURIComponent(netEntityFilter) : '')); }
    catch (e) { cn = null; }
    try { dn = await api('GET', '/api/net/dns'); }
    catch (e) { dn = null; }
    if (state.route !== 'net') return;
    if (stEl) stEl.innerHTML = netStatusCards(st);
    if (cbEl) cbEl.innerHTML = netConnsBody(cn);
    if (dbEl) dbEl.innerHTML = netDnsBody(dn);
  }

  async function fetchNetConns() {
    if (state.route !== 'net') return;
    const cbEl = $('#net-conns-body'); if (!cbEl) return;
    let cn;
    try {
      cn = await api('GET', '/api/net/conns' + (netEntityFilter ? '?entity=' + encodeURIComponent(netEntityFilter) : ''));
    } catch (e) { cn = null; }
    if (state.route !== 'net') return;
    cbEl.innerHTML = netConnsBody(cn);
  }

  async function fetchNetLog() {
    if (state.route !== 'net') return;
    const el = $('#net-log-body');
    try {
      const d = await api('GET', '/api/net/log');
      if (el) {
        if (!d || !d.file) { el.innerHTML = '<div class="empty">暂无 net_ 日志' + (d && !d.file ? '（netmgrd 未写日志）' : '') + '</div>'; return; }
        el.innerHTML = '<pre class="log-view">' + esc((d.lines || []).join('\n') || '(空)') +
          (d.truncated ? '\n…（超出尾部上限，部分被截断）' : '') + '</pre>';
        const name = $('#net-log-file'); if (name) name.textContent = d.file;
      }
    } catch (e) { if (el) el.innerHTML = '<div class="empty">日志加载失败：' + esc(errText(e)) + '</div>'; }
  }

  async function renderNet() {
    stopNet();
    netEntityFilter = '';
    netLoaded = false;
    $('#content').innerHTML =
      '<div class="page" id="net-page">' +
      '<div id="net-banner" class="page-banner" hidden></div>' +
      '<div id="net-status"><p class="placeholder">加载网络状态…</p></div>' +
      '<div class="card"><h3 class="card-title">每实体连接表</h3>' +
      '<div class="field-row" style="margin-bottom:12px">' +
      '<input type="text" id="net-entity-filter" placeholder="筛选实体（app: / svc: / proc:）" style="max-width:280px" value="' + esc(netEntityFilter) + '">' +
      '<button class="btn" id="net-conns-refresh">刷新</button></div>' +
      '<div id="net-conns-body"><p class="placeholder">加载连接表…</p></div></div>' +
      '<div class="card"><h3 class="card-title">DNS 代理</h3>' +
      '<div class="field-row" style="margin-bottom:12px">' +
      '<button class="btn" id="net-dns-flush">清空缓存</button></div>' +
      '<div id="net-dns-body"><p class="placeholder">加载 DNS 统计…</p></div></div>' +
      '<div class="card"><h3 class="card-title">网络日志 <span class="muted" id="net-log-file"></span></h3>' +
      '<div class="field-row" style="margin-bottom:12px"><button class="btn" id="net-log-refresh">刷新</button></div>' +
      '<div id="net-log-body"><p class="placeholder">加载日志…</p></div></div>' +
      '</div>';
    netTimer = setInterval(fetchNetOnce, 5000);   // status 仅瞬态横幅，不停止轮询
    fetchNetOnce();      // 填充 status + conns + dns
    fetchNetLog();
  }

  function bindNet() {
    $('#content').addEventListener('input', function (e) {
      const f = e.target.closest('#net-entity-filter'); if (!f) return;
      netEntityFilter = f.value.trim();
      const cb = $('#net-conns-body'); if (cb) cb.textContent = '筛选…';
      fetchNetConns();
    });
    $('#content').addEventListener('click', async function (e) {
      if (e.target.closest('#net-conns-refresh')) { fetchNetConns(); return; }
      if (e.target.closest('#net-log-refresh')) { fetchNetLog(); return; }
      if (e.target.closest('#net-banner-retry') || e.target.closest('#net-retry')) { fetchNetOnce(); return; }
      const flush = e.target.closest('#net-dns-flush');
      if (flush) {
        flush.disabled = true;
        try {
          const d = await api('POST', '/api/net/dns/flush');
          toast('已清空 DNS 缓存（' + (d && d.entries != null ? d.entries : '') + ' 条）');
        } catch (err) { toast('清缓存失败：' + errText(err)); }
        flush.disabled = false;
        fetchNetOnce();
      }
    });
  }

  /* ---------------- 3. 文件管理页 ---------------- */
  // 返回带索引的 rel 显示面包屑
  function joinRel(a, b) {
    if (!a || a === '/') return '/' + b;
    return (a.endsWith('/') ? a.slice(0, -1) : a) + '/' + b;
  }
  function crumbHtml(items, cur) { // items: [{name,rel}]
    let h = '<div class="crumbs" id="crumbs">';
    h += '<a data-rel="/" id="crumb-root">根目录</a>';
    items.forEach(it => { h += '<span>/</span><a data-rel="' + esc(it.rel) + '">' + esc(it.name) + '</a>'; });
    return h + '</div>';
  }
  async function navFiles(rel) {
    const page = $('#files-page');
    if (!page) return;
    let relPath = rel || '/';
    page.innerHTML = '<p class="placeholder">加载中…</p>';
    let d;
    try { d = await api('GET', '/api/files?path=' + encodeURIComponent(relPath)); }
    catch (e) { page.innerHTML = emptyState('加载失败：' + errText(e), e.code); return; }
    state.filesRel = d.rel || relPath; state.filesAbs = d.path;
    let h = crumbHtml(segments(d.rel), d.rel);
    // 白名单快捷入口（根目录下）
    if (d.rel === '/' && d.allowed) {
      h += '<div class="field-row wrap" style="margin-bottom:12px">' +
        d.allowed.map(a => '<button class="btn" data-nav="' + esc('/' + a) + '">' + esc(a) + '</button>').join(' ') + '</div>';
    }
    h += '<div class="field-row wrap" style="margin-bottom:12px">' +
      '<button class="btn" id="file-newdir">新建目录</button>' +
      '<button class="btn" id="file-upload">上传文件</button>' +
      '<button class="btn" id="file-refresh">刷新</button>' +
      '<input type="file" id="file-input" multiple hidden></div>';
    h += '<div class="card"><table class="table"><thead><tr><th>名称</th><th>大小</th><th>修改时间</th><th style="text-align:right">操作</th></tr></thead><tbody>';
    if (!d.items.length) h += '<tr><td colspan="4" class="empty">空目录</td></tr>';
    d.items.forEach(function (it) {
      const isDir = it.type === 'dir';
      const icon = isDir ? '📁' : (it.type === 'file' ? '📄' : '❔');
      h += '<tr><td>' + (isDir ? '<a class="dirlink" data-dir="' + esc(it.name) + '">' : '') + icon + ' ' + esc(it.name) + (isDir ? '</a>' : '') +
        '</td><td class="muted">' + (isDir ? '—' : fmtBytes(it.size)) + '</td><td class="muted">' + fmtTime(it.mtime) + '</td>' +
        '<td><div class="row-actions">' +
        (isDir ? '<button class="btn btn-ghost" data-enter="' + esc(it.name) + '">打开</button>' : '<a class="btn btn-ghost" data-dl="' + esc(it.name) + '" href="#">下载</a>') +
        '<button class="btn btn-ghost" data-ren="' + esc(it.name) + '">重命名</button>' +
        '<button class="btn btn-ghost btn-danger" data-del="' + esc(it.name) + '">删除</button>' +
        '</div></td></tr>';
    });
    h += '</tbody></table></div>';
    page.innerHTML = h;
  }
  function segments(rel) {
    const parts = (rel || '').split('/').filter(Boolean); const out = []; let cur = '';
    parts.forEach(p => { cur += '/' + p; out.push({ name: p, rel: cur }); });
    return out;
  }
  function renderFiles() { $('#content').innerHTML = '<div class="page" id="files-page"></div>'; navFiles(state.filesRel || '/'); }
  function absFor(name) { return state.filesAbs ? (state.filesAbs.endsWith('/') ? state.filesAbs + name : state.filesAbs + '/' + name) : null; }
  function bindFiles() {
    const c = $('#content');
    c.addEventListener('click', async function (e) {
      const t = e.target;
      const enter = t.closest('[data-enter]'); const dl = t.closest('[data-dl]');
      const ren = t.closest('[data-ren]'); const del = t.closest('[data-del]');
      const dirlink = t.closest('[data-dir]'); const nav = t.closest('[data-nav]');
      const crumb = t.closest('[data-rel]');
      const btn = t.closest('button[id]');
      if (crumb) { navFiles(crumb.dataset.rel); return; }
      if (nav) { navFiles(nav.dataset.nav); return; }
      if (dirlink || enter) { const n = (dirlink || enter).dataset.directory || (dirlink || enter).dataset.dir || (dirlink || enter).dataset.enter; navFiles(joinRel(state.filesRel, n)); return; }
      if (dl) {
        const abs = absFor(dl.dataset.dl); if (!abs) return toast('无当前目录');
        doDownload('/api/files/download?path=' + encodeURIComponent(abs), dl.dataset.dl);
        return;
      }
      if (ren) { renameFile(ren.dataset.ren); return; }
      if (del) { removeFile(del.dataset.del); return; }
      if (btn && btn.id === 'file-newdir') { mkdirFile(); return; }
      if (btn && btn.id === 'file-upload') { const fi = $('#file-input'); if (fi) { fi.value = ''; fi.click(); } return; }
      if (btn && btn.id === 'file-refresh') { navFiles(state.filesRel); return; }
    });
    c.addEventListener('change', function (e) {
      if (e.target.id === 'file-input') uploadFiles(e.target.files);
    });
  }
  function doDownload(url, name) {
    return apiDownload(url).then(blobUrl => {
      const a = document.createElement('a'); a.href = blobUrl; a.download = name || 'file';
      document.body.appendChild(a); a.click(); a.remove();
      setTimeout(() => URL.revokeObjectURL(blobUrl), 5000);
    }).catch(e => toast('下载失败：' + errText(e)));
  }
  async function removeFile(name) {
    const abs = absFor(name); if (!abs) return;
    const ok = await confirmDlg('删除 ' + name, '此操作不可撤销，确认删除？\n' + abs, true);
    if (!ok) return;
    try {
      await api('DELETE', '/api/files?path=' + encodeURIComponent(abs));
      toast('已删除 ' + name); navFiles(state.filesRel);
    } catch (e) { toast('删除失败：' + errText(e)); }
  }
  async function renameFile(name) {
    const abs = absFor(name); if (!abs) return;
    const nn = prompt('将「' + name + '」重命名为：', name);
    if (!nn || nn === name) return;
    try {
      await api('POST', '/api/files/rename', { path: abs, new_name: nn });
      toast('已重命名'); navFiles(state.filesRel);
    } catch (e) { toast('重命名失败：' + errText(e)); }
  }
  async function mkdirFile() {
    const abs = state.filesAbs; if (!abs) return;
    const nn = prompt('新建目录名称（将创建于 ' + state.filesRel + '）:', 'newdir');
    if (!nn) return;
    try {
      await api('POST', '/api/files/mkdir', { path: joinRel(abs, nn) });
      toast('已创建 ' + nn); navFiles(state.filesRel);
    } catch (e) { toast('创建失败：' + errText(e)); }
  }
  async function uploadFiles(files) {
    if (!files || !files.length) return;
    const abs = state.filesAbs; if (!abs) return toast('无当前目录');
    const fd = new FormData(); fd.append('path', abs);
    Array.prototype.forEach.call(files, f => fd.append('file', f));
    const n = files.length;
    toast('正在上传 ' + n + ' 个文件…');
    try {
      await api('POST', '/api/files/upload', fd);
      toast('上传完成'); navFiles(state.filesRel);
    } catch (e) { toast('上传失败：' + errText(e)); }
  }

  /* ---------------- 4. 应用管理页 ---------------- */
  function renderApps() {
    $('#content').innerHTML = '<div class="page" id="apps-page"><p class="placeholder">加载应用列表…</p></div>';
    (async function () {
      let d;
      try { d = await api('GET', '/api/apps'); }
      catch (e) { if (state.route === 'apps') $('#content').innerHTML = emptyState('加载失败：' + errText(e), e.code); return; }
      if (state.route !== 'apps') return;
      let h = '<div class="page" id="apps-page">';
      h += '<div class="field-row" style="margin-bottom:14px">' +
        '<button class="btn btn-primary" id="app-install">导入 .mpk 安装</button>' +
        '<button class="btn" id="app-refresh">刷新</button>' +
        '<input type="file" id="app-file" accept=".mpk" hidden></div>';
      h += '<div class="app-grid">';
      if (!d.apps.length) h += '<div class="empty" style="grid-column:1/-1">尚未安装任何 MeowAPP</div>';
      d.apps.forEach(a => {
        const ino = esc((a.name || a.package || '?').charAt(0).toUpperCase());
        h += '<div class="app-card" data-pkg="' + esc(a.package || '') + '">' +
          '<div class="app-head"><div class="app-ico">' + ino + '</div>' +
          '<div><div class="app-name">' + esc(a.name || a.package || '未命名') + '</div>' +
          '<div class="app-pkg">' + esc(a.package || '') + '</div></div></div>' +
          '<div class="app-meta">版本 ' + esc(a.version || '—') + (a.invalid ? ' · <span style="color:var(--error)">无效</span>' : '') +
          (a.size ? ' · ' + fmtBytes(a.size) : '') + '</div>' +
          '<div class="app-actions">' +
          '<button class="btn btn-ghost" data-ainfo="' + esc(a.package) + '">详情</button>' +
          '<a class="btn btn-ghost" data-aexport="' + esc(a.package) + '" href="#">导出 .mpk</a>' +
          '<button class="btn btn-danger" data-auninst="' + esc(a.package) + '">卸载</button>' +
          '</div></div>';
      });
      h += '</div>';
      // 本地源 .mpk 安装（后端支持 path 形式）
      h += '<div class="card"><h3 class="card-title">从卡上路径安装</h3>' +
        '<div class="field-row"><input type="text" id="app-install-path" placeholder="如 /MeowOS/tmp/os.meow.hello.mpk">' +
        '<button class="btn" id="app-install-path-go">安装</button></div></div>';
      $('#content').innerHTML = h;
    })();
  }
  function bindApps() {
    const c = $('#content');
    c.addEventListener('click', async function (e) {
      const t = e.target;
      const install = t.closest('#app-install'); const refresh = t.closest('#app-refresh');
      const info = t.closest('[data-ainfo]'); const exp = t.closest('[data-aexport]');
      const uninst = t.closest('[data-auninst]'); const goPath = t.closest('#app-install-path-go');
      if (install) { const fi = $('#app-file'); if (fi) { fi.value = ''; fi.click(); } return; }
      if (refresh) { renderApps(); return; }
      if (info) { appInfo(info.dataset.ainfo); return; }
      if (exp) {
        e.preventDefault();
        if (exp.dataset.busy) return;                 /* 打包期间防连点 */
        exp.dataset.busy = '1';
        const oldTxt = exp.textContent;
        exp.textContent = '打包中…';
        toast('正在打包导出 ' + exp.dataset.aexport + '，请稍候…');
        doDownload('/api/apps/' + exp.dataset.aexport + '/export', exp.dataset.aexport + '.mpk')
          .finally(() => { delete exp.dataset.busy; exp.textContent = oldTxt; });
        return;
      }
      if (uninst) { appUninstall(uninst.dataset.auninst); return; }
      if (goPath) { installFromPath($('#app-install-path').value); return; }
    });
    c.addEventListener('change', function (e) {
      if (e.target.id === 'app-file') installFromFile(e.target.files);
    });
  }
  async function installFromFile(files) {
    if (!files || !files.length) return;
    const fd = new FormData(); fd.append('file', files[0]);
    toast('正在安装 ' + files[0].name + '…');
    try {
      const d = await api('POST', '/api/apps/install', fd);
      toast('已安装 ' + (d.package || '应用') + (d.version ? ' v' + d.version : ''));
      renderApps();
    } catch (e) { toast('安装失败：' + errText(e)); }
  }
  async function installFromPath(p) {
    if (!p) return toast('请输入 .mpk 路径');
    toast('正在安装 ' + p + '…');
    try {
      const d = await api('POST', '/api/apps/install', { path: p });
      toast('已安装 ' + (d.package || '应用')); renderApps();
    } catch (e) { toast('安装失败：' + errText(e)); }
  }
  async function appUninstall(pkg) {
    const ok = await confirmDlg('卸载 ' + pkg, '将移除应用与数据预留（数据默认保留）。确认卸载？', true);
    if (!ok) return;
    try { await api('DELETE', '/api/apps/' + pkg); toast('已卸载 ' + pkg); renderApps(); }
    catch (e) { toast('卸载失败：' + errText(e)); }
  }
  async function appInfo(pkg) {
    try {
      const d = await api('GET', '/api/apps/' + pkg);
      let txt = '包名: ' + d.package + '\n名称: ' + d.name + '\n版本: ' + d.version + '\nexec: ' + d.exec +
        '\nsize: ' + fmtBytes(d.size) + '\n路径: ' + d.path;
      if (d.description) txt += '\n描述: ' + d.description;
      alert(txt);
    } catch (e) { toast('获取详情失败：' + errText(e)); }
  }

  /* ---------------- 4b. 字体管理页（/api/fonts* 专属页） ---------------- */
  function renderFontsPage() {
    $('#content').innerHTML = '<div class="page" id="fonts-page">' +
      '<div class="card"><h3 class="card-title">字体库</h3>' +
      '<div class="field-row" style="margin-bottom:14px">' +
        '<button class="btn btn-primary" id="fpage-import">上传字体库 .tar.gz</button>' +
        '<button class="btn" id="fpage-refresh">刷新</button>' +
        '<input type="file" id="fpage-file" accept=".tar.gz,.tgz,application/gzip" hidden></div>' +
      '<div id="fpage-list"><p class="muted">加载字体库列表…</p></div>' +
      '<p class="muted" style="margin-top:8px">上传 tar.gz（内含 font.png + font.idx + font.json，平铺三件套）→ 校验后解压到 ' +
        '<code>MeowOS/fonts/&lt;family&gt;/&lt;weight&gt;/</code>；同 family/weight 冲突时会要求确认覆盖。' +
        '导入后进设备「设置 → 字体」页，列表自动重扫生效。</p></div></div>';
    loadFontsPage();
  }
  async function loadFontsPage() {
    const box = $('#fpage-list'); if (!box) return;
    let d;
    try { d = await api('GET', '/api/fonts'); }
    catch (e) { box.innerHTML = '<p class="muted">字体库列表加载失败：' + esc(errText(e)) + '</p>'; return; }
    const fs = (d && d.fonts) || [];
    if (!fs.length) { box.innerHTML = '<div class="empty">暂无字库（TF 卡 MeowOS/fonts 下无完整三件套）</div>'; return; }
    let h = '<table class="table"><thead><tr><th>family</th><th>weight</th><th>名称</th><th>tier</th><th>glyph 数</th><th style="text-align:right">操作</th></tr></thead><tbody>';
    fs.forEach(f => {
      h += '<tr><td class="mono">' + esc(f.family || '') + '</td><td class="mono">' + esc(f.weight || '') + '</td>' +
        '<td>' + esc(f.name || '—') + '</td><td class="muted">' + esc(f.tier || '—') + '</td>' +
        '<td class="muted">' + (f.glyph_count ? Number(f.glyph_count).toLocaleString() : '—') + '</td>' +
        '<td><div class="row-actions"><button class="btn btn-ghost" data-fpexport="' + esc(f.family || '') +
        '" data-fpweight="' + esc(f.weight || '') + '">导出</button></div></td></tr>';
    });
    box.innerHTML = h + '</tbody></table>';
  }
  async function importFontPage(files) {
    if (!files || !files.length) return;
    const f = files[0];
    const btn = $('#fpage-import');
    if (btn && btn.disabled) return;                    // 上传中防连点（进度态）
    const fd = new FormData(); fd.append('file', f);
    if (btn) { btn.disabled = true; btn.textContent = '导入中…'; }
    toast('正在导入 ' + f.name + '…');
    let res = null;
    try { res = await api('POST', '/api/fonts/import', fd); }
    catch (err) {
      if (err.code === 'CONFLICT') {
        const ok = await confirmDlg('覆盖字库', '目标字库（同 family/weight）已存在，覆盖导入吗？', true);
        if (ok) {
          try { res = await api('POST', '/api/fonts/import?force=1', fd); }
          catch (e2) { toast('导入失败：' + errText(e2)); }
        }
      } else toast('导入失败：' + errText(err));
    }
    if (btn) { btn.disabled = false; btn.textContent = '上传字体库 .tar.gz'; }
    if (res) {
      toast('已导入 ' + (res.family || '') + '/' + (res.weight || ''));
      if (res.warning) toast(res.warning);
      else if (res.hint) toast(res.hint);
      loadFontsPage();
    }
  }
  function bindFonts() {
    const c = $('#content');
    c.addEventListener('click', function (e) {
      if (e.target.closest('#fpage-import')) { const inp = $('#fpage-file'); if (inp) { inp.value = ''; inp.click(); } return; }
      if (e.target.closest('#fpage-refresh')) { loadFontsPage(); return; }
      const fe = e.target.closest('[data-fpexport]');
      if (fe) {
        if (fe.dataset.busy) return;                    // 打包期间防连点
        fe.dataset.busy = '1';
        const old = fe.textContent; fe.textContent = '打包中…';
        const f = fe.dataset.fpexport, w = fe.dataset.fpweight;
        doDownload('/api/fonts/export?family=' + encodeURIComponent(f) + '&weight=' + encodeURIComponent(w),
          (f || 'font') + '-' + (w || 'regular') + '.font.tar.gz')
          .finally(() => { delete fe.dataset.busy; fe.textContent = old; });
        return;
      }
    });
    c.addEventListener('change', function (e) {
      if (e.target.id === 'fpage-file') importFontPage(e.target.files);
    });
  }

  /* ---------------- 5. 设置镜像页 ---------------- */
  function settingControl(it) {
    const key = it.key;
    if (key === 'panel.auth_pass') {
      const txt = it.set ? '已设置' : '未设置';
      return '<div class="field-row"><div style="flex:1" class="field-label">面板密码<span class="muted">（' + txt + '）</span></div>' +
        '<button class="btn btn-primary" data-skey="panel.auth_pass" data-stype="pass">' + (it.set ? '修改密码' : '设置密码') + '</button></div>';
    }
    if (it.type === 'bool') {
      return '<div class="field-row"><div style="flex:1" class="field-label"><div style="margin:0">' + esc(key) + '</div></div>' +
        '<label class="switch"><input type="checkbox" data-skey="' + esc(key) + '" data-stype="bool" ' + (it.value ? 'checked' : '') + '>' +
        '<span class="track"><span class="thumb"></span></span></label></div>';
    }
    if (it.type === 'int') {
      const mn = (it.min == null ? 0 : it.min), mx = (it.max == null ? 100 : it.max);
      return '<div class="field"><label class="field-label">' + esc(key) + '（' + mn + '–' + mx + '）</label>' +
        '<div class="field-row"><span class="muted" style="width:44px">' + esc(it.value == null ? '' : it.value) + '</span>' +
        '<input type="range" min="' + mn + '" max="' + mx + '" value="' + esc(it.value == null ? mn : it.value) + '" data-skey="' + esc(key) + '" data-stype="int"></div></div>';
    }
    if (it.type === 'enum') {
      const opts = (it.options || []).map(o => '<option value="' + esc(o.name) + '" ' + (o.name === it.value ? 'selected' : '') + '>' + esc(o.label || o.name) + '</option>').join('');
      return '<div class="field"><label class="field-label">' + esc(key) + '</label><select data-skey="' + esc(key) + '" data-stype="enum">' + opts + '</select></div>';
    }
    return '<div class="field"><label class="field-label">' + esc(key) + '</label><input type="text" value="' + esc(it.value == null ? '' : it.value) + '" data-skey="' + esc(key) + '" data-stype="str"></div>';
  }
  async function renderSettings() {
    $('#content').innerHTML = '<div class="page" id="settings-page"><p class="placeholder">加载设置…</p></div>';
    let d;
    try { d = await api('GET', '/api/settings'); }
    catch (e) { if (state.route === 'settings') $('#content').innerHTML = emptyState('加载失败：' + errText(e), e.code); return; }
    if (state.route !== 'settings') return;
    let h = '<div class="page" id="settings-page">';
    h += '<div class="field-row" style="margin-bottom:14px">' +
      '<button class="btn btn-danger" id="set-restore">恢复全部默认</button>' +
      '<button class="btn" id="set-refresh">刷新</button></div>';
    const items = d.items || [];
    // 面板外观（主题）：本面板覆盖（localStorage），默认跟随设备 ui.style / display.theme
    h += '<div class="card" id="theme-card"><h3 class="card-title">主题（面板外观）</h3>' +
      '<div class="field"><label class="field-label">风格</label>' +
      '<div class="field-row wrap"><div class="seg" id="set-style-seg">' +
      '<button class="seg-btn" data-style="md3">Material You</button>' +
      '<button class="seg-btn" data-style="miuix">MIUIx</button></div>' +
      '<button class="btn btn-ghost" id="set-style-reset">跟随设备</button></div>' +
      '<p class="muted" style="margin-top:6px">默认跟随设备 ui.style（当前：' + esc(devStyleLabel()) + '）；在面板选择即为本面板覆盖，只影响网页观感（顶栏切换才会同步设备）。</p></div>' +
      '<div class="field" style="margin-bottom:0"><label class="field-label">明暗模式</label>' +
      '<div class="seg" id="set-mode-seg">' +
      '<button class="seg-btn" data-mode="system">跟随系统</button>' +
      '<button class="seg-btn" data-mode="browser">跟随浏览器</button>' +
      '<button class="seg-btn" data-mode="light">浅色</button>' +
      '<button class="seg-btn" data-mode="dark">深色</button></div>' +
      '<p class="muted" style="margin-top:6px">跟随系统 = 设备 display.theme（当前：' + esc(devThemeLabel()) + '）；跟随浏览器 = prefers-color-scheme，随浏览器日/夜自动切换。</p></div></div>';
    // 面板 PIN（访问级鉴权）：显示状态 + 修改/清空控件（走 /api/auth/* 校验旧 PIN + PUT /api/settings/panel.pin）
    h += '<div class="card" id="pin-card"><h3 class="card-title">面板 PIN（访问鉴权）</h3>' +
      '<div id="pin-status"><p class="muted">查询鉴权状态…</p></div></div>';
    // 面板鉴权（可选防护）单独一卡
    const authItems = items.filter(x => x.key === 'panel.auth_enabled' || x.key === 'panel.auth_pass');
    if (authItems.length) {
      h += '<div class="card"><h3 class="card-title">面板鉴权（可选防护）</h3>' + authItems.map(settingControl).join('') +
        '<p class="muted" style="margin-top:8px">开启后访问面板需密码登录；密码以加盐哈希存储，不落明文。重启/关机/OTA 等危险操作亦需会话。</p></div>';
    }
    const rest = items.filter(x => x.key !== 'panel.auth_enabled' && x.key !== 'panel.auth_pass');
    // 按类型分组展示（bool 独立一卡，int/enum/str 各自卡片），便于查看
    const groups = [['开关/布尔', rest.filter(x => x.type === 'bool')],
                    ['数值/滑条', rest.filter(x => x.type === 'int')],
                    ['枚举/选择', rest.filter(x => x.type === 'enum')],
                    ['字符串/路径', rest.filter(x => x.type === 'str')]];
    groups.forEach(function (g) {
      if (!g[1].length) return;
      h += '<div class="card"><h3 class="card-title">' + g[0] + '</h3>' + g[1].map(settingControl).join('') + '</div>';
    });
    // 字体库（.zip 导入 / 导出）
    h += '<div class="card" id="fonts-card"><h3 class="card-title">字体库（.tar.gz 导入 / 导出）</h3>' +
      '<div class="field-row"><button class="btn" id="font-import">导入字体库 .tar.gz</button>' +
      '<input type="file" id="font-file" accept=".tar.gz,.tgz,application/gzip" hidden></div>' +
      '<div id="font-list"><p class="muted">加载字体库列表…</p></div>' +
      '<p class="muted" style="margin-top:8px">导入 tar.gz（内含 font.png + font.idx + font.json）→ 校验后解压到 MeowOS/fonts/&lt;family&gt;/&lt;weight&gt;/；导出把该三件套打包为 tar.gz。导入后进设备「设置 → 字体」页列表自动重扫生效。</p></div>';
    h += '</div>';
    $('#content').innerHTML = h;
    applyTheme();   // 同步「主题」卡 seg 选中态（applyTheme 按 id 查询，不存在时为空操作）
    loadFonts();
    loadPinStatus();
  }
  async function loadPinStatus() {
    const box = $('#pin-status');
    if (!box) return;
    let st = null;
    try { st = await api('GET', '/api/auth/status'); } catch (e) { box.innerHTML = '<p class="muted">无法查询鉴权状态：' + esc(errText(e)) + '</p>'; return; }
    let txt, cls;
    if (st.locked) { txt = '锁定中（' + Math.ceil((st.lock_remaining_ms || 0) / 1000) + ' 秒后可重试）'; cls = 'locked'; }
    else if (st.pin_set) { txt = '已设置'; cls = 'set'; }
    else if (st.legacy) { txt = '未设（旧密码屏障生效，建议改设为 PIN）'; cls = 'unset'; }
    else { txt = '未设置（当前访问面板无需 PIN）'; cls = 'unset'; }
    const canEdit = st.pin_set && !st.locked;
    let h = '<div class="pin-status"><span class="dot ' + cls + '"></span><strong>' + esc(txt) + '</strong>' +
      (st.session ? ' · <span class="muted">当前会话有效</span>' : ' · <span class="muted">未登录</span>') + '</div>';
    h += '<div class="field-row" style="margin-top:8px">' +
      '<button class="btn" id="pin-change" ' + (canEdit ? '' : 'disabled') + '>修改 PIN</button>' +
      '<button class="btn btn-danger" id="pin-clear" ' + (canEdit ? '' : 'disabled') + '>清空 PIN</button>' +
      (st.locked ? '<span class="muted">锁定期间不可修改/清空</span>' : '<span class="muted">修改/清空需先验证当前 PIN</span>') +
      '</div>';
    h += '<p class="muted" style="margin-top:6px">4 位数字 PIN，纯加盐哈希存储（不落明文）；未设 PIN 时写端点一律拒绝。</p>';
    box.innerHTML = h;
  }
  function pinEditDlg(mode) {   // 返回 {old, n1}（n1=null 表示清空）或 null（取消）
    return new Promise(function (resolve) {
      const t = $('#pindlg-title'), b = $('#pindlg-body');
      const oldIn = $('#pindlg-old'), n1 = $('#pindlg-new'), n2 = $('#pindlg-new2');
      const err = $('#pindlg-err');
      if (mode === 'change') {
        t.textContent = '修改 PIN';
        b.textContent = '请输入当前 PIN 与新 PIN（4 位数字）。';
        oldIn.hidden = false; n1.hidden = false; n2.hidden = false;
        n1.placeholder = '新 4 位 PIN'; n2.placeholder = '再次输入新 PIN';
      } else {
        t.textContent = '清空 PIN';
        b.textContent = '清空后访问面板将不再要求 PIN。请输入当前 PIN 确认。';
        oldIn.hidden = false; n1.hidden = true; n2.hidden = true;
      }
      err.hidden = true; oldIn.value = ''; n1.value = ''; n2.value = '';
      oldIn.focus();
      const scrim = $('#pindlg'); scrim.hidden = false;
      const ok = $('#pindlg-ok'), cancel = $('#pindlg-cancel');
      const done = function (v) { scrim.hidden = true; ok.onclick = cancel.onclick = scrim.onclick = null; resolve(v); };
      ok.onclick = function () {
        const old = oldIn.value.trim();
        if (!old) { err.textContent = '请输入当前 PIN'; err.hidden = false; return; }
        if (mode === 'change') {
          const np = n1.value.trim();
          if (!/^[0-9]{4}$/.test(np)) { err.textContent = '新 PIN 必须为 4 位数字'; err.hidden = false; return; }
          if (np !== n2.value.trim()) { err.textContent = '两次输入的新 PIN 不一致'; err.hidden = false; return; }
          done({ old: old, n1: np });
        } else done({ old: old, n1: null });
      };
      cancel.onclick = function () { done(null); };
      scrim.onclick = function (e) { if (e.target === scrim) done(null); };
    });
  }
  async function pinEdit(mode) {
    const v = await pinEditDlg(mode);
    if (!v) return;
    try { await api('POST', '/api/auth/login', { pin: v.old }); }   // 先验证旧 PIN（客户端复核，后端改 PIN 本身不需旧值）
    catch (e2) {
      if (e2.code === 'LOCKED' || e2.status === 429) toast('错误次数过多，已锁定，请稍后重试（锁定 5 分钟）');
      else if (e2.status === 401) toast('当前 PIN 验证失败');
      else toast('验证失败：' + errText(e2));
      loadPinStatus(); return;
    }
    try {
      await api('PUT', '/api/settings/panel.pin', { value: (v.n1 !== null ? v.n1 : '') });
      toast(mode === 'change' ? 'PIN 已修改' : 'PIN 已清空');
      loadPinStatus();
    } catch (e3) { toast('操作失败：' + errText(e3)); }
  }
  function bindPin() {
    const c = $('#content');
    c.addEventListener('click', function (e) {
      if (e.target.closest('#pin-change')) { pinEdit('change'); return; }
      if (e.target.closest('#pin-clear')) { pinEdit('clear'); return; }
    });
    ['#pindlg-old', '#pindlg-new', '#pindlg-new2'].forEach(function (sel) {
      const el = $(sel);
      if (el) el.addEventListener('input', function () { el.value = el.value.replace(/[^0-9]/g, '').slice(0, 4); });
    });
  }
  async function loadFonts() {
    const box = $('#font-list'); if (!box) return;
    let d;
    try { d = await api('GET', '/api/fonts'); }
    catch (e) { box.innerHTML = '<p class="muted">字体库列表加载失败：' + esc(errText(e)) + '</p>'; return; }
    const fs = (d && d.fonts) || [];
    if (!fs.length) { box.innerHTML = '<p class="muted">暂无字库（TF 卡 MeowOS/fonts 下无完整三件套）。</p>'; return; }
    box.innerHTML = fs.map(f => {
      const nm = esc(f.name || f.family || '');
      const meta = esc((f.family || '') + '/' + (f.weight || '') + (f.tier ? ' · ' + f.tier : '') + (f.glyph_count ? ' · ' + f.glyph_count + ' 字' : ''));
      return '<div class="field-row"><div style="flex:1;overflow:hidden;text-overflow:ellipsis">' +
        '<div>' + nm + '</div><div class="muted">' + meta + '</div></div>' +
        '<button class="btn" data-fexport="' + esc(f.family || '') + '" data-fweight="' + esc(f.weight || '') + '">导出</button></div>';
    }).join('');
  }
  async function importFont(files) {
    if (!files || !files.length) return;
    const f = files[0];
    const fd = new FormData(); fd.append('file', f);
    toast('正在导入 ' + f.name + '…');
    let res;
    try { res = await api('POST', '/api/fonts/import', fd); }
    catch (err) {
      if (err.code === 'CONFLICT') {
        const ok = await confirmDlg('覆盖字库', '目标字库已存在，覆盖导入吗？', true);
        if (!ok) return;
        try { res = await api('POST', '/api/fonts/import?force=1', fd); }
        catch (e2) { toast('导入失败：' + errText(e2)); return; }
      } else { toast('导入失败：' + errText(err)); return; }
    }
    toast('已导入 ' + ((res && res.family) || '') + '/' + ((res && res.weight) || ''));
    if (res && res.hint) toast(res.hint);
    loadFonts();
  }
  function bindSettings() {
    const c = $('#content');
    c.addEventListener('input', function (e) {
      const r = e.target.closest('[data-stype="int"]'); if (!r) return;
      const row = r.closest('.field-row'); if (row) row.querySelector('.muted').textContent = r.value;
      updateSetting(r.dataset.skey, +r.value, 'int');
    });
    c.addEventListener('change', function (e) {
      if (e.target.id === 'font-file') { importFont(e.target.files); return; }
      const t = e.target;
      const sk = t.dataset.skey; if (!sk) return;
      if (t.dataset.stype === 'bool') updateSetting(sk, t.checked, 'bool');
      else if (t.dataset.stype === 'enum') updateSetting(sk, t.value, 'enum');
      else if (t.dataset.stype === 'str') updateSetting(sk, t.value, 'str');
    });
    c.addEventListener('click', async function (e) {
      // 「主题（面板外观）」卡：本面板覆盖（localStorage），不写设备
      const ss = e.target.closest('#set-style-seg .seg-btn');
      if (ss) { storageSet('meowpanel.style', ss.dataset.style); applyTheme(); return; }
      const sm = e.target.closest('#set-mode-seg .seg-btn');
      if (sm) { storageSet('meowpanel.mode', sm.dataset.mode); applyTheme(); return; }
      if (e.target.closest('#set-style-reset')) { storageDel('meowpanel.style'); applyTheme(); return; }
      if (e.target.closest('#font-import')) { const inp = $('#font-file'); if (inp) { inp.value = ''; inp.click(); } return; }
      const fe = e.target.closest('[data-fexport]');
      if (fe) {
        const f = fe.dataset.fexport, w = fe.dataset.fweight;
        doDownload('/api/fonts/export?family=' + encodeURIComponent(f) + '&weight=' + encodeURIComponent(w), (f || 'font') + '-' + (w || 'regular') + '.font.tar.gz');
        return;
      }
      if (e.target.closest('[data-stype="pass"]')) { setPanelPassword(); return; }
      if (e.target.closest('#set-restore')) {
        const ok = await confirmDlg('恢复全部默认', '将把全部设置恢复为出厂默认（含主题/亮度/音量）。继续？', true);
        if (!ok) return;
        try { await api('POST', '/api/settings/restore'); toast('已恢复默认'); renderSettings(); }
        catch (err) { toast('恢复失败：' + errText(err)); }
      } else if (e.target.closest('#set-refresh')) { renderSettings(); }
    });
  }
  const updateSetting = debounce(async function (key, value, type) {
    try { await api('PUT', '/api/settings/' + key, { value: value }); toast('已保存 ' + key); }
    catch (e) { toast('保存失败：' + errText(e)); }
  }, 350);

  /* ---------------- 6. 远程控制页 ---------------- */
  function renderRemote() {
    const keys = [
      { code: 115, label: '音量 +', ico: '🔊' },
      { code: 114, label: '音量 −', ico: '🔉' },
      { code: 116, label: '电源（单击）', ico: '⏻' },
      { code: 164, label: '播放/暂停', ico: '⏯' },
      { code: 163, label: '下一曲', ico: '⏭' },
      { code: 165, label: '上一曲', ico: '⏮' },
      { code: 158, label: '返回', ico: '↩' },
      { code: 172, label: '主页', ico: '⌂' }
    ];
    let h = '<div class="page" id="remote-page">';
    h += '<div class="card"><h3 class="card-title">模拟按键</h3>' +
      '<p class="muted">行为与本地按键一致（设备端系统统一接管）。长按电源将触发电源菜单。</p>' +
      '<div class="key-grid">' + keys.map(k =>
        '<button class="key-btn" data-code="' + k.code + '"><span class="k-ico">' + k.ico + '</span>' + esc(k.label) + '</button>'
      ).join('') + '</div></div>';
    h += '<div class="card"><h3 class="card-title">电源长按（电源菜单）</h3>' +
      '<div class="field-row" style="gap:10px"><button class="btn btn-primary" data-powerlong="1">长按电源 3s（电源菜单）</button>' +
      '<span class="muted">发送 code=116 · press=long · ms=3000</span></div></div>';
    h += '</div>';
    $('#content').innerHTML = h;
  }
  async function sendKey(code, press, ms) {
    try { await api('POST', '/api/key/' + code, { press: press || 'tap', ms: ms }); toast('已发送 键 ' + code); }
    catch (e) { toast('发送失败：' + errText(e)); }
  }
  function bindRemote() {
    $('#content').addEventListener('click', function (e) {
      const kb = e.target.closest('[data-code]'); if (kb) { sendKey(kb.dataset.code, 'tap'); return; }
      const pl = e.target.closest('[data-powerlong]'); if (pl) { sendKey(116, 'long', 3000); return; }
    });
  }

  /* ---------------- 7. 系统信息 / OTA 页 ---------------- */
  async function renderSystem() {
    $('#content').innerHTML = '<div class="page" id="system-page"><p class="placeholder">加载系统信息…</p></div>';
    let d, pw = null;
    try { d = await api('GET', '/api/system'); }
    catch (e) { if (state.route === 'system') $('#content').innerHTML = emptyState('加载失败：' + errText(e), e.code); return; }
    try { pw = await api('GET', '/api/power'); } catch (e) { pw = null; }
    if (state.route !== 'system') return;
    const net = d.network || {}; const wf = net.wifi || {}; const bt = net.bluetooth || {}; const ota = d.ota || {};
    const boot = d.boot || {};
    const curMode = boot.mode || boot.current || null;      // 后端若暴露 /tmp/meow_boot_mode → boot.mode/current
    const bootDef = boot.default || '—';
    const mism = curMode && boot.default && curMode !== boot.default;
    const batt = (pw && pw.battery) || {};
    const charging = (batt.state === 'Charging' || batt.state === 'Full');
    let modeHtml = mism
      ? '<span style="color:var(--error);font-weight:600">' + esc(curMode) + '</span> <span class="muted">（与默认启动不一致）</span>'
      : (curMode ? esc(curMode) : '—');
    let sysRows = row('MeowOS 版本', esc(d.version || '—')) + row('内核', esc(d.kernel || '—')) + row('架构', esc(d.arch || '—')) +
      row('主机名', esc(d.hostname || '—')) + row('运行时间', fmtUptime(d.uptime_sec));
    if (pw && pw.battery) {
      sysRows += row('电池', '<span class="home-chip ' + (charging ? 'ok' : 'mut') + '">' + esc(batt.state || '—') + '</span> ' +
        (batt.pct != null ? batt.pct + ' %' : '—') +
        (batt.mv != null ? ' · ' + (batt.mv / 1000).toFixed(2) + ' V' : '') +
        (batt.health ? ' · ' + esc(batt.health) : ''));
    }
    sysRows += row('当前运行模式', modeHtml);
    sysRows += row('默认启动', esc(bootDef));
    sysRows += row('重启原因', esc(boot.reboot_reason || d.reboot_reason || '—'));
    sysRows += row('升级状态', esc(boot.upgrade_status || d.upgrade_status || '—'));
    let h = '<div class="page" id="system-page">';
    h += '<div class="card"><h3 class="card-title">系统信息</h3><table class="table"><tbody>' + sysRows + '</tbody></table></div>';
    h += '<div class="card"><h3 class="card-title">网络</h3><table class="table"><tbody>' +
      row('WiFi', wf.connected ? esc(wf.ssid || '已连接') + ' · ' + esc(wf.ip || '—') + (wf.rssi != null ? ' · ' + wf.rssi + 'dBm' : '') : '未连接') +
      row('蓝牙', bt.available ? ((bt.powered ? '已开启' : '已关闭') + (bt.connected ? ' · 已连接' : '')) : '无蓝牙') +
      row('mDNS', esc(net.hostname_local || '—')) +
      '</tbody></table></div>';
    h += '<div class="card"><h3 class="card-title">升级</h3>' +
      '<p class="muted">当前 ' + esc(ota.current || d.version || '—') +
      (ota.available ? ' · 发现新版本 ' + esc(ota.latest || '') : ' · 已是最新') + '</p>' +
      '<div class="field-row" style="gap:10px"><button class="btn btn-primary" id="sys-ota-check">检查升级</button>' +
      '<button class="btn btn-danger" id="sys-ota">⚠️ 升级</button></div></div>';
    h += '<div class="card danger-box"><h3 class="card-title">危险操作</h3>' +
      '<div class="field-row" style="gap:10px"><button class="btn btn-danger" id="sys-reboot">重启</button>' +
      '<button class="btn btn-danger" id="sys-shutdown">关机</button></div>' +
      '<p class="warn-note">⚠️ 重启/关机/升级均为高风险操作，请先保存好正在进行的任务。</p></div>';
    h += '</div>';
    $('#content').innerHTML = h;
  }
  function row(k, v) { return '<tr><td class="muted" style="width:120px">' + k + '</td><td>' + v + '</td></tr>'; }
  function bindSystem() {   // init 一次性委托绑定（不随渲染累积）
    $('#content').addEventListener('click', async function (e) {
      if (e.target.closest('#sys-reboot')) {
        if (await confirmDlg('确认重启', '系统将立即重启，请在浏览器中关闭本页。', true))
          try { await api('POST', '/api/system/reboot', {}); toast('已请求重启'); } catch (err) { toast('重启失败：' + errText(err)); }
        return;
      }
      if (e.target.closest('#sys-shutdown')) {
        if (await confirmDlg('确认关机', '系统将立即关机，请在浏览器中关闭本页。', true))
          try { await api('POST', '/api/system/shutdown', {}); toast('已请求关机'); } catch (err) { toast('关机失败：' + errText(err)); }
        return;
      }
      if (e.target.closest('#sys-ota')) {
        if (await confirmDlg('确认升级', '⚠️ 升级中断可能导致系统无法启动，请确保已连接电源。确认开始升级？', true))
          try { await api('POST', '/api/system/ota', {}); toast('已触发升级任务'); } catch (err) { toast('升级失败：' + errText(err)); }
        return;
      }
      if (e.target.closest('#sys-ota-check')) {
        // 检查升级只读，用 GET /api/system 读 ota.available/latest；勿 POST /api/system/ota（那是触发升级）
        try { const r = await api('GET', '/api/system'); const o = r.ota || {}; toast(o.available ? '发现新版本 ' + o.latest : '已是最新版本'); }
        catch (err) { toast('检查失败：' + errText(err)); }
        return;
      }
    });
  }

  /* ---------------- 8. 日志页 ---------------- */
  async function renderLogs() {
    $('#content').innerHTML = '<div class="page" id="logs-page"><p class="placeholder">加载日志列表…</p></div>';
    let d;
    try { d = await api('GET', '/api/logs'); }
    catch (e) { if (state.route === 'logs') $('#content').innerHTML = emptyState('加载失败：' + errText(e), e.code); return; }
    if (state.route !== 'logs') return;
    let h = '<div class="page" id="logs-page">';
    h += '<div class="card"><h3 class="card-title">日志文件（MeowOS/logs）</h3>';
    h += '<div class="field-row" style="margin-bottom:12px"><span class="muted">' + esc(d.dir || '') + '</span></div>';
    h += '<table class="table"><thead><tr><th>文件</th><th>大小</th><th>修改时间</th><th style="text-align:right">操作</th></tr></thead><tbody>';
    if (!d.files.length) h += '<tr><td colspan="4" class="empty">暂无日志</td></tr>';
    d.files.forEach(f => {
      h += '<tr><td class="mono">' + esc(f.name) + '</td><td class="muted">' + fmtBytes(f.size) + '</td><td class="muted">' + fmtTime(f.mtime) + '</td>' +
        '<td><div class="row-actions"><button class="btn btn-ghost" data-log="' + esc(f.name) + '">查看</button></div></td></tr>';
    });
    h += '</tbody></table></div><pre class="log-view" id="log-view" hidden></pre></div>';
    $('#content').innerHTML = h;
  }
  function bindLogs() {
    $('#content').addEventListener('click', async function (e) {
      const t = e.target.closest('[data-log]'); if (!t) return;
      const p = $('#log-view');
      try {
        const d = await api('GET', '/api/logs/read?file=' + encodeURIComponent(t.dataset.log) + '&lines=400');
        p.hidden = false; p.textContent = (d.lines || []).join('\n') + (d.truncated ? '\n…（更多行被截断）' : '');
      } catch (err) { toast('查看失败：' + errText(err)); }
    });
  }

  /* ---------------- 9. 通知页 ---------------- */
  async function renderNotif() {
    $('#content').innerHTML = '<div class="page" id="notif-page"><p class="placeholder">加载通知…</p></div>';
    let d;
    try { d = await api('GET', '/api/notifications'); }
    catch (e) { if (state.route === 'notif') $('#content').innerHTML = emptyState('加载失败：' + errText(e), e.code); return; }
    if (state.route !== 'notif') return;
    let h = '<div class="page" id="notif-page">';
    h += '<div class="field-row" style="margin-bottom:14px"><button class="btn" id="notif-refresh">刷新</button>' +
      '<button class="btn btn-danger" id="notif-clear">清空通知</button></div>';
    const list = d.notifications || [];
    if (!list.length) h += '<div class="empty">暂无通知</div>';
    list.forEach(n => {
      const urg = n.urgency >= 2 ? '高' : (n.urgency === 1 ? '中' : '低');
      h += '<div class="notif" data-id="' + esc(n.id) + '"><div class="n-ico">' + esc((n.app_name || '?').charAt(0).toUpperCase()) + '</div>' +
        '<div class="n-body"><div class="n-title">' + esc(n.summary || n.app_name || '通知') + '</div>' +
        (n.body ? '<div class="n-text">' + esc(n.body) + '</div>' : '') +
        '<div class="n-meta"><span>' + esc(n.app_name || '') + '</span><span>' + fmtTime(n.ts) + '</span>' +
        '<span class="' + (n.urgency >= 2 ? 'urgency-hi' : '') + '">紧急度 ' + urg + '</span>' +
        (n.progress != null ? '<span>进度 ' + n.progress + '%</span>' : '') +
        (n.ongoing ? '<span>进行中</span>' : '') + '</div></div>' +
        '<button class="btn btn-ghost" data-ndel="' + esc(n.id) + '">清除</button></div>';
    });
    h += '</div>';
    $('#content').innerHTML = h;
  }
  function bindNotif() {
    $('#content').addEventListener('click', async function (e) {
      if (e.target.closest('#notif-refresh')) { renderNotif(); return; }
      if (e.target.closest('#notif-clear')) {
        if (await confirmDlg('清空通知', '将清空全部通知。确认？', true))
          try { await api('POST', '/api/notifications/dismiss_all'); toast('已清空'); renderNotif(); }
          catch (err) { toast('清空失败：' + errText(err)); }
        return;
      }
      const del = e.target.closest('[data-ndel]'); if (del) {
        try { await api('DELETE', '/api/notifications/' + del.dataset.ndel); toast('已清除'); renderNotif(); }
        catch (err) { toast('清除失败：' + errText(err)); }
      }
    });
  }

  /* ---------------- 10. 实时屏幕 / 点击遥控 ----------------
   * 轮询改「上一帧到了再取下一帧」（链式 setTimeout，绝不堆积/重叠）：
   * 每帧下载完成后按目标周期自校正 delay（周期 = max(0, interval - 请求耗时)），
   * 故名义 fps 被尊重，且请求变慢时自动退化为 1/请求耗时。 */
  let screenTimer = null, screenBusy = false, screenOn = false;
  let screenObjUrl = null, screenFps = 1;
  let screenLastMs = 0, screenMeasFps = 0;      // 实测帧率（帧间间隔 EMA）
  let screenDelta = false, screenCanvasRef = null, screenCanvasReady = false;   // 增量模式（canvas 叠加）
  function stopScreenPoll() {
    screenOn = false;
    if (screenTimer) { clearTimeout(screenTimer); screenTimer = null; }
  }
  function restartScreenPoll() {
    screenOn = true;
    if (screenTimer) { clearTimeout(screenTimer); screenTimer = null; }
    // 请求在途时不重复启动（避免并发请求）；在途帧结束后会按最新 screenFps 自续
    if (!screenBusy) screenTimer = setTimeout(fetchScreen, 0);
  }
  async function fetchScreen() {
    if (screenBusy) return;
    screenBusy = true;
    const t0 = performance.now();
    let statusMsg = '';
    try {
      const headers = {};
      const token = storageGet('meowpanel.token');
      if (token) headers['X-MeowToken'] = token;
      const deltaQ = screenDelta ? '&delta=1' : '';
      const res = await fetch('/api/screen.jpeg?t=' + Date.now() + '&q=70' + deltaQ,
        Object.keys(headers).length ? { headers: headers } : undefined);
      if (!res.ok) { $('#screen-status').textContent = '获取失败（HTTP ' + res.status + '）'; return; }
      const hd = (k) => res.headers.get(k);
      if (screenDelta) {
        const isDelta = hd('X-Meow-Delta') === '1';
        const full = hd('X-Meow-Full') === '1';
        const changed = parseInt(hd('X-Meow-Changed') || '-1', 10);
        const fw = parseInt(hd('X-Meow-W') || '480', 10);
        const fh = parseInt(hd('X-Meow-H') || '720', 10);
        const blob = await res.blob();
        if (!isDelta || full) {                        // 整帧（或旧后端无 delta 头）→ 播种/替换 canvas
          const img = await createImgFromBlob(blob);
          const cv = ensureScreenCanvas(fw, fh);
          if (cv) { cv.getContext('2d').drawImage(img, 0, 0, fw, fh); screenCanvasReady = true; }
          statusMsg = '已更新' + (changed >= 0 ? '（整帧）' : '');
        } else if (!screenCanvasReady) {               // 尚未播种：取一整帧再继续
          await seedScreenCanvas(fw, fh);
          if (screenCanvasReady) statusMsg = '已更新（播种）';
        } else if (changed === 0) {                    // 无变化：跳过叠加
          statusMsg = '无变化';
        } else {                                       // 子图叠加
          const subX = parseInt(hd('X-Meow-Sub-X') || '0', 10);
          const subY = parseInt(hd('X-Meow-Sub-Y') || '0', 10);
          const subW = parseInt(hd('X-Meow-Sub-W') || fw, 10);
          const subH = parseInt(hd('X-Meow-Sub-H') || fh, 10);
          const img = await createImgFromBlob(blob);
          const cv = ensureScreenCanvas(fw, fh);
          if (cv) cv.getContext('2d').drawImage(img, subX, subY, subW, subH);
          statusMsg = '已更新（增量 ' + changed + ' 块）';
        }
      } else {
        const blob = await res.blob();
        const url = URL.createObjectURL(blob);
        const img = $('#screen-img');
        if (!img) { URL.revokeObjectURL(url); return; }
        img.src = url;
        if (screenObjUrl) URL.revokeObjectURL(screenObjUrl);
        screenObjUrl = url;
        statusMsg = '已更新';
      }
      // 实测帧率：上一帧到本帧间隔的 EMA（首帧无间隔）
      const now = performance.now();
      if (screenLastMs) {
        const dt = (now - screenLastMs) / 1000;
        screenMeasFps = screenMeasFps ? screenMeasFps * 0.7 + (1 / dt) * 0.3 : 1 / dt;
      }
      screenLastMs = now;
      $('#screen-status').textContent = statusMsg + (screenMeasFps ? ' · ' + screenMeasFps.toFixed(1) + ' fps' : '') + ' · ' + new Date().toLocaleTimeString();
    } catch (e) {
      $('#screen-status').textContent = '后端未连接';
    }
    screenBusy = false;
    // 自校正续链（本轮耗时计入周期，保证名义 fps）
    if (screenOn) {
      const intervalMs = Math.max(500, Math.round(1000 / screenFps));
      const wait = Math.max(0, intervalMs - (performance.now() - t0));
      screenTimer = setTimeout(fetchScreen, wait);
    }
  }
  // 增量模式助手：blob → Image（一次性 objectURL，加载后即回收）
  async function createImgFromBlob(blob) {
    const url = URL.createObjectURL(blob);
    try {
      const img = new Image();
      await new Promise((resolve, reject) => { img.onload = resolve; img.onerror = reject; img.src = url; });
      return img;
    } finally { URL.revokeObjectURL(url); }
  }
  function ensureScreenCanvas(fw, fh) {
    let cv = screenCanvasRef;
    if (!cv) cv = screenCanvasRef = $('#screen-canvas');
    if (!cv) return null;
    if (cv.width !== fw || cv.height !== fh) { cv.width = fw; cv.height = fh; }
    return cv;
  }
  async function seedScreenCanvas(fw, fh) {
    const headers = {};
    const token = storageGet('meowpanel.token');
    if (token) headers['X-MeowToken'] = token;
    const res = await fetch('/api/screen.jpeg?t=' + Date.now() + '&q=70',
      Object.keys(headers).length ? { headers: headers } : undefined);
    if (!res.ok) return false;
    const img = await createImgFromBlob(await res.blob());
    const cv = ensureScreenCanvas(fw, fh);
    if (!cv) return false;
    cv.getContext('2d').drawImage(img, 0, 0, fw, fh);
    screenCanvasReady = true;
    return true;
  }
  function applyScreenDeltaDom() {
    const img = $('#screen-img'), cv = $('#screen-canvas');
    if (!img || !cv) return;
    if (screenDelta) { img.style.display = 'none'; cv.style.display = 'block'; }
    else { img.style.display = 'block'; cv.style.display = 'none'; }
  }
  async function screenTap(e) {
    const img = $('#screen-img'), cv = $('#screen-canvas');
    const useCanvas = screenDelta && cv && cv.style.display !== 'none';
    const el = useCanvas ? cv : img;
    if (!el) return;
    const r = el.getBoundingClientRect();
    if (!r.width || !r.height) return;
    // 前端按 480x720（设备原生分辨率）换算
    const nx = Math.round((e.clientX - r.left) / r.width * 480);
    const ny = Math.round((e.clientY - r.top) / r.height * 720);
    const nxCL = Math.max(0, Math.min(479, nx)), nyCL = Math.max(0, Math.min(719, ny));
    try {
      const d = await api('POST', '/api/input/tap', { x: nxCL, y: nyCL });
      if (d && d.dispatched) toast('已注入 (' + nxCL + ',' + nyCL + ')');
      else if (d && d.reason === 'local_touch_active') toast('本机触摸中，注入已暂停');
      else toast('注入未派发');
    } catch (err) { toast('注入失败：' + errText(err)); }
  }
  function renderScreen() {
    screenFps = parseFloat(storageGet('screen.fps') || '1');
    if (!(screenFps >= 0.2 && screenFps <= 2)) screenFps = 1;
    let h = '<div class="page" id="screen-page">';
    h += '<div class="card"><h3 class="card-title">实时画面</h3>' +
      '<p class="muted">点击画面 = 在设备上点击该处。本机有人触摸时，注入自动暂停 5 秒；设备息屏请先点亮。</p>' +
      '<div class="screen-frame">' +
        '<img id="screen-img" alt="设备实时画面">' +
        '<canvas id="screen-canvas" style="display:none"></canvas>' +
      '</div>' +
      '<div class="field-row" style="margin-top:12px">' +
        '<label class="muted" for="screen-fps">刷新率</label>' +
        '<input type="range" id="screen-fps" min="0.2" max="2" step="0.1" value="' + screenFps + '">' +
        '<span class="muted" id="screen-fps-lbl" style="min-width:56px">' + screenFps.toFixed(1) + ' fps</span>' +
      '</div>' +
      '<div class="field-row" style="margin-top:6px">' +
        '<label class="muted"><input type="checkbox" id="screen-delta"' + (screenDelta ? ' checked' : '') + '> 增量传输（省流量）</label>' +
      '</div>' +
      '<p class="muted" id="screen-status">载入中…</p>' +
    '</div></div>';
    $('#content').innerHTML = h;
    screenCanvasRef = null; screenCanvasReady = false;    // 切换页面重置增量 canvas 状态
    const slider = $('#screen-fps');
    slider.addEventListener('input', function () {
      const v = parseFloat(slider.value);
      screenFps = v; storageSet('screen.fps', String(v));
      $('#screen-fps-lbl').textContent = v.toFixed(1) + ' fps';
      restartScreenPoll();
    });
    const deltaBox = $('#screen-delta');
    deltaBox.addEventListener('change', function () {
      screenDelta = deltaBox.checked;
      screenCanvasRef = null; screenCanvasReady = false;   // 换增量模式：强制重新播种
      applyScreenDeltaDom();
      restartScreenPoll();
    });
    $('#screen-img').addEventListener('click', screenTap);
    $('#screen-canvas').addEventListener('click', screenTap);
    applyScreenDeltaDom();
    // restartScreenPoll 已排程首帧（上一帧到了再取下一帧），勿再显式 fetch 以免双发
    restartScreenPoll();
  }
  function bindScreen() {
    // 页面隐藏（切到其它标签页）时停刷；回到本页继续
    document.addEventListener('visibilitychange', function () {
      if (document.hidden) stopScreenPoll();
      else if (state.route === 'screen') restartScreenPoll();
    });
  }

  /* ---------------- 路由 ---------------- */
  const ROUTES = {
    home: { title: '首页仪表盘', render: renderHome, bind: bindHome },
    perf: { title: '实时性能', render: renderPerf, bind: null },
    bright: { title: '亮度 · 音量', render: renderBright, bind: null },
    audio: { title: '音频状态', render: renderAudio, bind: null },
    net: { title: '网络管理', render: renderNet, bind: bindNet },
    files: { title: '文件管理', render: renderFiles, bind: bindFiles },
    apps: { title: 'MeowAPPs 管理', render: renderApps, bind: bindApps },
    fonts: { title: '字体管理', render: renderFontsPage, bind: bindFonts },
    settings: { title: '设置镜像', render: renderSettings, bind: bindSettings },
    remote: { title: '远程控制', render: renderRemote, bind: bindRemote },
    screen: { title: '实时屏幕', render: renderScreen, bind: bindScreen },
    system: { title: '系统信息 / 升级', render: renderSystem, bind: bindSystem },
    logs: { title: '系统日志', render: renderLogs, bind: bindLogs },
    notif: { title: '通知中心', render: renderNotif, bind: bindNotif },
    power: { title: '电源 / 功耗', render: renderPower, bind: null },
    proc: { title: '进程 / 服务', render: renderProc, bind: bindProc }
  };
  // 一次性绑定（各菜单 click / 侧栏）；页面内交互用 #content 事件委托（已各自绑定）
  function bindNav() {
    $$('.nav-item').forEach(b => b.addEventListener('click', () => { location.hash = '#/' + b.dataset.route; }));
    $('#menu-btn').addEventListener('click', () => $('#sidebar').classList.toggle('open'));
  }
  function route() {
    if (state.unauth) { showLogin(authMode); return; }   // 未认证 → 登录页（保持当前设置/登录态）
    const id = (location.hash || '#/home').replace('#/', '').split('?')[0] || 'home';
    const r = ROUTES[id] || ROUTES.home;
    state.route = id;
    stopPerf();
    stopAudio();
    stopNet();
    stopScreenPoll();
    stopHome();
    stopPower();
    stopProc();
    $$('.nav-item').forEach(b => b.classList.toggle('active', b.dataset.route === id));
    $('#page-title').textContent = r.title;
    r.render();
  }

  /* ---------------- 启动 ---------------- */
  let started = false;
  function startApp() {
    if (started) { route(); return; }
    started = true;
    initTheme();
    window.addEventListener('hashchange', route);
    route();
  }
  async function init() {
    bindNav();
    bindThemeUi();
    bindSlider();
    bindFiles(); bindApps(); bindFonts(); bindSettings(); bindRemote(); bindScreen(); bindSystem(); bindLogs(); bindNotif(); bindNet(); bindHome(); bindProc(); bindPin();
    bindLogin();
    bindPwDlg();
    // 首次进入：访问级 PIN 鉴权——已登录直接进；未设 PIN（且无旧密码）→ 首次设置流程；已设 → 登录
    let st = null;
    try { st = await api('GET', '/api/auth/status'); } catch (e) { st = null; }
    if (st && st.session) { startApp(); return; }
    if (st && !st.pin_set && !st.legacy) { showLogin('setup'); return; }
    if (st) { showLogin('login'); return; }
    startApp();   // 后端不可达：仍启动（显示离线横幅）
  }
  document.addEventListener('DOMContentLoaded', init);
})();