const app = document.getElementById('app')
// Iconos SVG en línea (trazo estilo Lucide), heredan el color del texto.
const ICONS = {
  home: '<path d="M3 10.5 12 3l9 7.5"/><path d="M5 9.5V21h14V9.5"/><path d="M10 21v-6h4v6"/>',
  history: '<path d="M3 12a9 9 0 1 0 3-6.7L3 8"/><path d="M3 3v5h5"/><path d="M12 7v5l3 2"/>',
  download: '<path d="M12 3v12"/><path d="m7 10 5 5 5-5"/><path d="M5 21h14"/>',
  settings: '<path d="M4 6h9M17 6h3M4 12h3M11 12h9M4 18h11M19 18h1"/><circle cx="15" cy="6" r="2"/><circle cx="9" cy="12" r="2"/><circle cx="17" cy="18" r="2"/>',
  play: '<path d="M7 4v16l13-8z"/>',
  book: '<path d="M2 5h6a4 4 0 0 1 4 4v12a3 3 0 0 0-3-3H2z"/><path d="M22 5h-6a4 4 0 0 0-4 4v12a3 3 0 0 1 3-3h7z"/>',
  stopRead: '<circle cx="12" cy="12" r="9"/><path d="m15 9-6 6M9 9l6 6"/>',
  stop: '<rect x="6" y="6" width="12" height="12" rx="1.5"/>',
  trash: '<path d="M3 6h18"/><path d="M8 6V4h8v2"/><path d="M6 6l1 15h10l1-15"/><path d="M10 11v6M14 11v6"/>',
  refresh: '<path d="M21 12a9 9 0 1 1-2.6-6.4L21 8"/><path d="M21 3v5h-5"/>',
  search: '<circle cx="11" cy="11" r="7"/><path d="m20 20-3.5-3.5"/>',
  sort: '<path d="m7 15 5 5 5-5"/><path d="m7 9 5-5 5 5"/>',
  back: '<path d="M19 12H5"/><path d="m12 19-7-7 7-7"/>',
  prev: '<path d="m15 18-6-6 6-6"/>',
  next: '<path d="m9 18 6-6-6-6"/>',
  more: '<path d="m6 9 6 6 6-6"/>',
  check: '<path d="M20 6 9 17l-5-5"/>',
  login: '<path d="M15 3h4a2 2 0 0 1 2 2v14a2 2 0 0 1-2 2h-4"/><path d="m10 17 5-5-5-5"/><path d="M15 12H3"/>',
  logout: '<path d="M9 21H5a2 2 0 0 1-2-2V5a2 2 0 0 1 2-2h4"/><path d="m16 17 5-5-5-5"/><path d="M21 12H9"/>',
  userPlus: '<circle cx="9" cy="8" r="4"/><path d="M2 21a7 7 0 0 1 14 0"/><path d="M19 8v6M16 11h6"/>',
  flame: '<path d="M12 22c3.9 0 7-2.8 7-7 0-3.5-2.4-5.6-3.6-8.6-.9 1.8-1.9 2.9-3 3.2.2-3.1-.9-5.6-3-7.6.3 4-4.4 6.8-4.4 12.6C5 19.2 8.1 22 12 22z"/>',
  clock: '<circle cx="12" cy="12" r="9"/><path d="M12 7v5l3 2"/>',
  grid: '<rect x="3" y="3" width="7" height="7" rx="1"/><rect x="14" y="3" width="7" height="7" rx="1"/><rect x="3" y="14" width="7" height="7" rx="1"/><rect x="14" y="14" width="7" height="7" rx="1"/>',
  globe: '<circle cx="12" cy="12" r="9"/><path d="M3 12h18"/><path d="M12 3a14 14 0 0 1 0 18 14 14 0 0 1 0-18z"/>',
  key: '<circle cx="8" cy="15" r="4"/><path d="m11 12 9-9M17 6l3 3"/>',
  bell: '<path d="M6 8a6 6 0 0 1 12 0c0 7 3 9 3 9H3s3-2 3-9"/><path d="M10.3 21a1.9 1.9 0 0 0 3.4 0"/>',
  bellOff: '<path d="M8.7 3A6 6 0 0 1 18 8a21 21 0 0 0 .6 5"/><path d="M17 17H3s3-2 3-9a4.7 4.7 0 0 1 .3-2"/><path d="M10.3 21a1.9 1.9 0 0 0 3.4 0"/><path d="m2 2 20 20"/>',
  chart: '<path d="M3 3v18h18"/><path d="M7 16v-4M12 16V8M17 16v-7"/>',
  zoomOut: '<circle cx="11" cy="11" r="7"/><path d="m20 20-3.5-3.5M8 11h6"/>',
  send: '<path d="M22 2 11 13"/><path d="M22 2 15 22l-4-9-9-4z"/>',
  dots: '<circle cx="5" cy="12" r="1.2"/><circle cx="12" cy="12" r="1.2"/><circle cx="19" cy="12" r="1.2"/>',
  x: '<path d="M18 6 6 18"/><path d="m6 6 12 12"/>',
  scroll: '<rect x="6" y="2" width="12" height="9" rx="1.5"/><rect x="6" y="13" width="12" height="9" rx="1.5"/>',
  pages: '<rect x="2" y="5" width="9" height="14" rx="1.5"/><rect x="13" y="5" width="9" height="14" rx="1.5"/>',
  sparkles: '<path d="M12 3l1.8 5.2L19 10l-5.2 1.8L12 17l-1.8-5.2L5 10l5.2-1.8z"/><path d="M19 15l.8 2.2L22 18l-2.2.8L19 21l-.8-2.2L16 18l2.2-.8z"/>',
}
const icon = name => `<svg class="ic" viewBox="0 0 24 24" fill="none" stroke="currentColor" stroke-width="2" stroke-linecap="round" stroke-linejoin="round" aria-hidden="true">${ICONS[name]}</svg>`
// Iconos del menú superior (index.html).
document.querySelectorAll('#topbar nav a[data-icon]').forEach(a => { a.innerHTML = `${icon(a.dataset.icon)}<span>${a.textContent}</span>` })

const SOURCES = { lc: 'LeerCapitulo (español)', md: 'MangaDex (multi-idioma)' }
// Filtros de imagen del lector (CSS filter); el brillo se suma aparte.
const FILTERS = {
  none: ['Sin filtro', ''],
  sepia: ['Sepia', 'sepia(.65) contrast(.95)'],
  paper: ['Papel cálido', 'sepia(.35) saturate(1.15) hue-rotate(-8deg) brightness(.95)'],
  vintage: ['Vintage', 'sepia(.45) contrast(1.1) saturate(.75)'],
  night: ['Noche (invertido)', 'invert(.88) hue-rotate(180deg) contrast(.95)'],
  gray: ['Blanco y negro', 'grayscale(1)'],
  contrast: ['Alto contraste', 'contrast(1.35) brightness(1.03)'],
  vivid: ['Colores vivos', 'saturate(1.45) contrast(1.05)'],
}
const DL_ACTIVE = ['queued', 'downloading']
const fmtSize = b => (b >= 1e9 ? `${(b / 1e9).toFixed(1)} GB` : b >= 1e6 ? `${Math.round(b / 1e6)} MB` : `${Math.round((b || 0) / 1e3)} KB`)
// Progreso global contando la fracción del capítulo en curso.
function downloadPct(d) {
  if (!d?.total) return 0
  const frac = d.current?.pagesTotal ? d.current.pages / d.current.pagesTotal : 0
  return Math.min(100, ((d.done + frac) / d.total) * 100)
}
function downloadDetail(d) {
  const c = d?.current
  if (!c) return d?.status === 'queued' ? 'Esperando turno…' : ''
  return c.pagesTotal ? `Cap. ${esc(c.chapter ?? '?')} · pág. ${c.pages}/${c.pagesTotal}` : `Cap. ${esc(c.chapter ?? '?')} · preparando…`
}
function downloadLabel(d) {
  if (!d) return ''
  const n = `${d.done}/${d.total || '?'}`
  return {
    queued: 'En cola…',
    downloading: `Descargando ${n}`,
    done: `Descargado (${d.done} caps.)`,
    error: `Descarga incompleta ${n}`,
    cancelled: `Descarga cancelada ${n}`,
  }[d.status] || d.status
}
const LANGS = { 'es-la': 'Español (Latam)', es: 'Español (España)', en: 'English', 'pt-br': 'Português (BR)', fr: 'Français', it: 'Italiano', ja: '日本語' }
let me = null
let cleanup = null

// ---------- Utilidades ----------
const esc = s => String(s ?? '').replace(/[&<>"']/g, c => ({ '&': '&amp;', '<': '&lt;', '>': '&gt;', '"': '&quot;', "'": '&#39;' }[c]))
const $ = (sel, root = document) => root.querySelector(sel)
const store = {
  get(k, d) { try { return JSON.parse(localStorage.getItem(k)) ?? d } catch { return d } },
  set(k, v) { try { localStorage.setItem(k, JSON.stringify(v)) } catch {} },
}
function toast(msg) {
  const t = document.getElementById('toast')
  t.textContent = msg
  t.hidden = false
  clearTimeout(toast.t)
  toast.t = setTimeout(() => (t.hidden = true), 2500)
}
async function api(path, opts = {}) {
  const res = await fetch(path, {
    ...opts,
    headers: opts.body ? { 'Content-Type': 'application/json' } : undefined,
    body: opts.body ? JSON.stringify(opts.body) : undefined,
  })
  const data = await res.json().catch(() => ({}))
  if (res.status === 401 && !path.startsWith('/api/login')) { me = null; location.hash = '#/login'; throw new Error('No autenticado') }
  if (!res.ok) throw new Error(data.error || `Error ${res.status}`)
  return data
}
function timeAgo(ts) {
  const s = (Date.now() - ts) / 1000
  if (s < 60) return 'hace un momento'
  if (s < 3600) return `hace ${Math.floor(s / 60)} min`
  if (s < 86400) return `hace ${Math.floor(s / 3600)} h`
  return `hace ${Math.floor(s / 86400)} d`
}
const chapLabel = c => (c.num ? `Cap. ${c.num}` : 'Oneshot') + (c.title ? ` — ${c.title}` : '')
const readUrl = (mangaId, chapterId, page) => `#/read/${mangaId}/${chapterId}${page != null ? `?page=${page + 1}` : ''}`

// ---------- Router ----------
async function router() {
  if (cleanup) { cleanup(); cleanup = null }
  document.body.classList.remove('reading')
  const [pathPart, query] = location.hash.slice(1).split('?')
  const parts = (pathPart || '/').split('/').filter(Boolean)
  const params = new URLSearchParams(query || '')
  document.querySelectorAll('#topbar nav a').forEach(a => a.classList.toggle('active', a.getAttribute('href') === `#/${parts[0] ?? ''}`))

  if (!me) {
    const r = await api('/api/me').catch(() => ({}))
    me = r.user
    me && (me.signup = r.signup)
    if (!me) return viewAuth(r.signup)
  }
  try {
    if (parts[0] === 'login') return (location.hash = '#/')
    if (parts[0] === 'manga') return await viewManga(parts[1])
    if (parts[0] === 'read') return await viewReader(parts[1], parts[2], Number(params.get('page') || 0) - 1)
    if (parts[0] === 'history') return await viewHistory()
    if (parts[0] === 'downloads') return await viewDownloads()
    if (parts[0] === 'stats') return await viewStats()
    if (parts[0] === 'settings') return viewSettings()
    return await viewHome(params)
  } catch (e) {
    if (e.message !== 'No autenticado') app.innerHTML = `<p class="error">${esc(e.message)}</p>`
  }
}
window.addEventListener('hashchange', router)
router()

// ---------- Login / registro ----------
function viewAuth(signup) {
  app.innerHTML = `
  <div class="auth">
    <h1>Manga Reader</h1>
    <p class="muted">Inicia sesión para leer y guardar tu progreso.</p>
    <form>
      <input type="text" name="username" placeholder="Usuario" autocomplete="username" required>
      <input type="password" name="password" placeholder="Contraseña" autocomplete="current-password" required>
      <p class="error"></p>
      <button class="btn primary" value="login">${icon('login')} Entrar</button>
      ${signup ? `<button class="btn" value="register">${icon('userPlus')} Crear cuenta</button>` : ''}
    </form>
  </div>`
  const form = $('form', app)
  form.addEventListener('submit', async ev => {
    ev.preventDefault()
    const mode = ev.submitter?.value === 'register' ? 'register' : 'login'
    const fd = new FormData(form)
    try {
      await api(`/api/${mode}`, { method: 'POST', body: { username: fd.get('username'), password: fd.get('password') } })
      me = null
      location.hash = '#/'
      router()
    } catch (e) { $('.error', form).textContent = e.message }
  })
}

// ---------- Inicio ----------
function mangaCard(m) {
  return `<a class="card" href="#/manga/${m.id}">
    <img class="cover" loading="lazy" src="${esc(m.cover || '/icon.svg')}" alt="">
    <div class="t">${esc(m.title)}</div>${m.sub ? `<div class="sub">${esc(m.sub)}</div>` : ''}</a>`
}
function continueCard(h) {
  const pct = h.total_pages ? Math.round(((h.page + 1) / h.total_pages) * 100) : 0
  // Terminado con capítulos nuevos: a la ficha, para elegir el siguiente.
  return `<a class="cont" href="${h.hasNew ? `#/manga/${h.manga_id}` : readUrl(h.manga_id, h.chapter_id, h.page)}">
    <img src="${esc(h.cover || '/icon.svg')}" alt="" loading="lazy">
    <div class="info"><b>${esc(h.manga_title)}</b>
      <div class="muted">${h.chapter_num ? `Cap. ${esc(h.chapter_num)}` : 'Oneshot'} · pág. ${h.page + 1}/${h.total_pages || '?'}</div>
      ${h.finished ? '<div><span class="badge">Terminado</span></div>' : h.hasNew ? '<div><span class="badge">Caps. nuevos</span></div>' : ''}
      <div class="muted" style="font-size:.8rem">${timeAgo(h.updated_at)}</div>
      <div class="bar"><i style="width:${pct}%"></i></div></div></a>`
}
// Sección "Novedades": mangas seguidos con capítulos nuevos.
function newsSection(fol) {
  const fresh = fol.follows.filter(f => f.newCount > 0)
  const status = fol.checking ? 'Comprobando…' : fol.lastCheckAt ? `Última comprobación ${timeAgo(fol.lastCheckAt)}` : `Se comprueba cada ${fol.intervalHours} h`
  if (!fol.follows.length) return ''
  return `<div class="row" style="justify-content:space-between;margin-top:8px">
      <h2 style="margin:12px 0">${icon('sparkles')} Novedades ${fresh.length ? `<span class="badge">${fresh.reduce((n, f) => n + f.newCount, 0)}</span>` : ''}</h2>
      <span class="row muted" style="font-size:.85rem">Sigues ${fol.follows.length} manga${fol.follows.length === 1 ? '' : 's'} · ${status}
        <button class="btn small" id="checknow" ${fol.checking ? 'disabled' : ''}>${icon('refresh')} Comprobar ahora</button></span></div>
    ${fresh.length ? `<div class="continue">${fresh.map(f => `<a class="cont" href="#/manga/${f.manga_id}">
        <img src="${esc(f.cover || '/icon.svg')}" alt="" loading="lazy">
        <div class="info"><b>${esc(f.title)}</b>
          <div><span class="badge">${f.newCount} ${f.newCount === 1 ? 'cap. nuevo' : 'caps. nuevos'}</span></div>
          <div class="muted" style="font-size:.8rem">${f.last_new_at ? timeAgo(f.last_new_at) : ''}</div></div></a>`).join('')}</div>`
      : '<p class="muted" style="margin-top:0">No hay capítulos nuevos en los mangas que sigues.</p>'}`
}
function bindNews() {
  $('#checknow')?.addEventListener('click', async e => {
    e.target.closest('button').disabled = true
    await api('/api/follows/check', { method: 'POST' })
    toast('Comprobando capítulos nuevos…')
    // Refrescar la sección mientras dura la comprobación.
    const poll = async () => {
      const fol = await api('/api/follows').catch(() => null)
      if (!fol || !$('#news')) return
      $('#news').innerHTML = newsSection(fol)
      bindNews()
      if (fol.checking) setTimeout(poll, 3000)
      else toast('Comprobación terminada')
    }
    setTimeout(poll, 2000)
  })
}
const tagHref = (source, t) => `#/?source=${source}&tag=${encodeURIComponent(t.id)}&tagName=${encodeURIComponent(t.name)}`
async function viewHome(params) {
  const q = params.get('q') || ''
  const tag = params.get('tag') || ''
  const tagName = params.get('tagName') || tag
  const mode = tag ? 'cats' : params.get('mode') || 'popular'
  const anyLang = params.get('any') === '1'
  const source = SOURCES[params.get('source')] ? params.get('source') : store.get('source', 'lc')
  store.set('source', source)
  const showCats = mode === 'cats' && !tag
  app.innerHTML = `
    <section id="cont"></section>
    <div class="tabs" id="sources">${Object.entries(SOURCES).map(([k, v]) => `<button data-s="${k}" class="${k === source ? 'on' : ''}">${v}</button>`).join('')}</div>
    <form class="search"><input type="search" name="q" placeholder="Buscar ${tag ? `en «${esc(tagName)}»` : `en ${esc(SOURCES[source])}`}…" value="${esc(q)}"><button class="btn primary">${icon('search')}<span class="lbl">Buscar</span></button></form>
    <label class="muted row" style="font-size:.88rem" ${source === 'md' ? '' : 'hidden'}><input type="checkbox" name="any" ${anyLang ? 'checked' : ''}> Incluir mangas sin traducción a ${esc(LANGS[me.lang] || me.lang)}</label>
    ${q && !tag ? `<h2>Resultados para “${esc(q)}”</h2>` : `<div class="tabs" id="modes">
      <button data-m="popular" class="${mode === 'popular' ? 'on' : ''}">${icon('flame')} Populares</button>
      <button data-m="latest" class="${mode === 'latest' ? 'on' : ''}">${icon('clock')} Actualizados recientemente</button>
      <button data-m="cats" class="${mode === 'cats' ? 'on' : ''}">${icon('grid')} Categorías</button></div>`}
    ${tag ? `<h2>Categoría: <a class="tag on" href="#/?source=${source}&mode=cats" title="Quitar filtro">${esc(tagName)} ✕</a>${q ? ` · “${esc(q)}”` : ''}</h2>` : ''}
    <div id="results" class="loading">Cargando…</div>
    <div class="row" style="justify-content:center;margin:16px 0"><button class="btn" id="more" hidden>${icon('more')} Cargar más</button></div>`
  const form = $('form', app)
  const go = (extra = {}) => {
    const p = new URLSearchParams({ source, ...(form.q.value ? { q: form.q.value } : { mode }), ...(tag ? { tag, tagName } : {}), ...($('[name=any]').checked ? { any: '1' } : {}), ...extra })
    location.hash = `#/?${p}`
  }
  form.addEventListener('submit', e => { e.preventDefault(); go() })
  $('[name=any]').addEventListener('change', () => go())
  app.querySelectorAll('#modes button').forEach(b => b.addEventListener('click', () => { location.hash = `#/?source=${source}&mode=${b.dataset.m}${anyLang ? '&any=1' : ''}` }))
  app.querySelectorAll('#sources button').forEach(b => b.addEventListener('click', () => { location.hash = `#/?source=${b.dataset.s}&mode=${mode}${anyLang ? '&any=1' : ''}` }))

  if (!q && !tag && !showCats) {
    Promise.all([api('/api/history'), api('/api/follows')]).then(([hist, fol]) => {
      if (!$('#cont')) return
      $('#cont').innerHTML = `<div id="news">${newsSection(fol)}</div>` + (hist = hist.filter(h => !h.finished), hist.length ? `<h2>Continuar leyendo</h2><div class="continue">${hist.slice(0, 12).map(continueCard).join('')}</div>` : '')
      bindNews(fol)
    }).catch(() => {})
  }

  const res = $('#results')
  if (showCats) {
    const cats = await api(`/api/categories?source=${source}`)
    const groups = cats.reduce((m, c) => m.set(c.group, [...(m.get(c.group) || []), c]), new Map())
    res.className = 'cats'
    res.innerHTML = [...groups].map(([g, list]) => `<h3>${esc(g)}</h3><div class="tags">${list.map(t => `<a class="tag big" href="${tagHref(source, t)}">${esc(t.name)}</a>`).join('')}</div>`).join('')
    return
  }

  // Paginación: MangaDex siempre; LeerCapitulo solo en categorías (sus otros listados no paginan).
  const pageable = source === 'md' || !!tag
  const seen = new Set()
  let page = 1
  const load = async () => {
    const qs = new URLSearchParams({ q, mode, source, page, ...(tag ? { tag } : {}), ...(anyLang ? { anyLang: '1' } : {}) })
    const list = (await api(`/api/search?${qs}`)).filter(m => !seen.has(m.id) && seen.add(m.id))
    if (page === 1) {
      res.className = list.length ? 'grid' : 'loading'
      res.innerHTML = list.length ? '' : 'Sin resultados.'
    }
    res.insertAdjacentHTML('beforeend', list.map(mangaCard).join(''))
    $('#more').hidden = !pageable || list.length < 20
  }
  $('#more').addEventListener('click', async e => {
    e.target.disabled = true
    page++
    try { await load() } catch (err) { toast(err.message) }
    e.target.disabled = false
  })
  await load()
}

// ---------- Ficha del manga ----------
async function viewManga(id, langOverride) {
  if (cleanup) { cleanup(); cleanup = null }
  app.innerHTML = '<div class="loading">Cargando…</div>'
  const lang = langOverride || store.get(`lang:${id}`, me.lang)
  const { manga, chapters, reads, progress, chapterLangs, offline, downloaded, download, upscale, following, newKeys = [] } = await api(`/api/manga/${id}?lang=${encodeURIComponent(lang)}`)
  const dlSet = new Set(downloaded)
  let hdSet = new Set(upscale?.chapters || []), hdJobs = upscale?.jobs || {}
  const newSet = new Set(newKeys.map(String))
  let isFollowing = following
  const readMap = new Map(reads.map(r => [r.chapter_id, r]))
  const isLc = manga.source === 'lc'
  const langOpts = [...new Set([lang, me.lang, ...chapterLangs, ...manga.languages])].filter(Boolean)
  const altSearch = `#/?source=lc&q=${encodeURIComponent(manga.title)}`
  const first = chapters[0]
  let mainBtn = ''
  if (progress && chapters.some(c => c.id === progress.chapter_id)) {
    mainBtn = `<a class="btn primary" href="${readUrl(id, progress.chapter_id, progress.page)}">${icon('play')} Continuar · ${progress.chapter_num ? `Cap. ${esc(progress.chapter_num)}` : 'Oneshot'}, pág. ${progress.page + 1}</a>`
  } else if (progress) {
    mainBtn = `<a class="btn primary" href="${readUrl(id, progress.chapter_id, progress.page)}">${icon('play')} Continuar · Cap. ${esc(progress.chapter_num ?? '?')} (${esc(LANGS[progress.lang] || progress.lang || '')}), pág. ${progress.page + 1}</a>`
  }
  if (first && !mainBtn) mainBtn = `<a class="btn primary" href="${readUrl(id, first.id)}">${icon('book')} Empezar a leer</a>`

  const menuItems = [
    isLc ? '' : `<a href="${altSearch}">${icon('search')} Buscar en LeerCapitulo</a>`,
    progress || reads.length ? `<button id="drop" class="danger">${icon('stopRead')} Dejar de leer…</button>` : '',
  ].join('')

  app.innerHTML = `
  <div class="detail">
    <img class="cover" src="${esc(manga.cover || '/icon.svg')}" alt="">
    <div class="detail-body">
      <h1>${esc(manga.title)}</h1>
      <div class="muted">${esc(manga.authors.join(', '))}${manga.year ? ` · ${manga.year}` : ''}${manga.status ? ` · ${esc(manga.status)}` : ''}</div>
      <div class="tags">${manga.tags.map(t => (t.id ? `<a class="tag" href="${tagHref(manga.source, t)}">${esc(t.name)}</a>` : `<span class="tag">${esc(t.name ?? t)}</span>`)).join('')}</div>
      <p class="desc">${esc(manga.description)}</p>
      <div class="actions">${mainBtn}
        <button class="btn" id="follow"></button>
        ${menuItems ? `<details class="menu"><summary class="btn" title="Más opciones" aria-label="Más opciones">${icon('dots')}</summary><div class="menu-list">${menuItems}</div></details>` : ''}
      </div>
      <div class="facts muted"><span>Fuente: ${esc(SOURCES[manga.source])}</span>${download ? `<span>Carpeta: mangas/${esc(download.folder)}</span>` : ''}</div>
      ${offline ? '<p class="error">Sin conexión con la fuente: mostrando solo los capítulos descargados.</p>' : ''}
      <div class="libpanel"><div class="psec" id="dl"></div><div class="psec" id="hd" hidden></div></div>
    </div>
  </div>
  <div class="list-head">
    <h2>Capítulos <span class="muted">(${chapters.length})</span>${newSet.size ? ` <span class="badge">${newSet.size} ${newSet.size === 1 ? 'nuevo' : 'nuevos'}</span>` : ''}</h2>
    <div class="row">
      ${isLc ? '' : `<select id="lang" title="Idioma de los capítulos">${langOpts.map(l => `<option value="${esc(l)}" ${l === lang ? 'selected' : ''}>${esc(LANGS[l] || l)}</option>`).join('')}</select>`}
      ${chapters.length > 1 ? `<button class="btn small" id="order">${icon('sort')} Invertir orden</button>` : ''}
    </div>
  </div>
  ${chapters.length ? '<ul class="chapters"></ul>' : isLc ? '<p class="muted">Este manga no tiene capítulos.</p>' : `<p class="muted">No hay capítulos legibles en ${esc(LANGS[lang] || lang)} (MangaDex retira algunos por licencia).
    Prueba a <a class="tag" href="${altSearch}">buscarlo en LeerCapitulo</a>.
    ${chapterLangs.length ? `Disponibles en: ${chapterLangs.map(l => `<a class="tag" href="#" data-lang="${esc(l)}">${esc(LANGS[l] || l)}</a>`).join(' ')}` : 'No hay capítulos en ningún idioma.'}</p>`}
  <div id="selbar" hidden></div>`

  // --- Copia local (descarga) con sondeo del progreso mientras está activa.
  let dlTimer = null
  const secHead = (ic, title, status) => `<div class="psec-head"><div class="psec-title">${icon(ic)} ${title}</div>${status ? `<div class="psec-status muted">${status}</div>` : ''}</div>`
  const renderDl = d => {
    const box = $('#dl')
    if (!box) return
    const active = d && DL_ACTIVE.includes(d.status)
    const partial = d && d.done < d.total
    const bar = d && (active || partial) ? `<div class="bar dlbar"><i style="width:${downloadPct(d).toFixed(1)}%"></i></div>` : ''
    const delBtn = d ? `<button class="btn small danger push" id="dldel">${icon('trash')} Eliminar copia${d.size ? ` · ${fmtSize(d.size)}` : ''}</button>` : ''
    let status = '', body = '', actions = ''
    if (!d) {
      body = '<div class="note muted">Guarda los capítulos en CBZ en el servidor para leerlos sin conexión (y poder reescalarlos a HD).</div>'
      actions = `<button class="btn small" id="dlgo">${icon('download')} Descargar manga</button>`
    } else if (active) {
      status = `${downloadLabel(d)} · ${Math.floor(downloadPct(d))}%`
      body = `${bar}<div class="note muted">${downloadDetail(d)}</div>`
      actions = `<button class="btn small" id="dlcancel">${icon('stop')} Cancelar</button>${delBtn}`
    } else {
      status = d.status === 'done' ? `${icon('check')} ${d.done} capítulos${d.size ? ` · ${fmtSize(d.size)}` : ''}` : downloadLabel(d)
      body = bar + (d.status === 'error' && d.error ? `<div class="error note">${esc(d.error)}</div>` : '')
      actions = `<button class="btn small" id="dlgo" title="Descarga los capítulos que falten">${icon(d.status === 'cancelled' ? 'download' : 'refresh')} ${d.status === 'error' ? 'Reintentar' : d.status === 'cancelled' ? 'Continuar descarga' : 'Buscar capítulos nuevos'}</button>${delBtn}`
    }
    box.innerHTML = secHead('download', 'Copia local', status) + body + (offline ? '' : `<div class="psec-actions">${actions}</div>`)
    $('#dlgo')?.addEventListener('click', async () => {
      renderDl(await api(`/api/download/${id}`, { method: 'POST', body: { lang, title: manga.title } }))
      toast(`Descargando en mangas/${manga.title}`)
    })
    $('#dlcancel')?.addEventListener('click', async () => renderDl(await api(`/api/download/${id}/cancel`, { method: 'POST' })))
    $('#dldel')?.addEventListener('click', async () => {
      if (!confirm(`¿Eliminar la copia local de «${manga.title}»?\nSe borrará la carpeta mangas/${d.folder}${d.size ? ` (${fmtSize(d.size)})` : ''}, incluida la versión HD.\nTu historial de lectura no se toca.`)) return
      await api(`/api/download/${id}`, { method: 'DELETE' })
      toast('Copia local eliminada')
      viewManga(id, langOverride)
    })
    clearTimeout(dlTimer)
    if (active) dlTimer = setTimeout(async () => {
      const next = await api(`/api/download/${id}`).catch(() => d)
      if (!$('#dl')) return
      if (next && next.done !== d.done) {
        const fresh = await api(`/api/manga/${id}?lang=${encodeURIComponent(lang)}`).catch(() => null)
        fresh?.downloaded.forEach(x => dlSet.add(x))
        if (fresh?.download) next.size = fresh.download.size
        if (fresh?.upscale) renderHd(fresh.upscale)
        renderList()
      }
      renderDl(next)
    }, 2000)
  }

  // --- Reescalado HD: todo lo pendiente, un rango o una selección hecha en la lista.
  let hdTimer = null
  let hdInfo = upscale
  let hdForm = null // null (cerrado) | 'pending' | 'range' | 'pick'
  const picked = new Set()
  let lastPick = null
  const fmtDur = sec => sec < 90 ? '≈ 1 min' : sec < 3600 ? `≈ ${Math.round(sec / 60)} min` : `≈ ${Math.floor(sec / 3600)} h ${Math.round((sec % 3600) / 60)} min`
  // Descargados, sin HD y sin estar ya en cola (los fallidos sí, para reintentar). En orden de lectura.
  const hdCandidates = () => chapters.filter(c => dlSet.has(c.id) && !hdSet.has(c.id) && (!hdJobs[c.id] || hdJobs[c.id] === 'error'))
  const estimate = ids => {
    const pages = ids.reduce((n, cid) => n + (hdInfo?.pages?.[cid] || 0), 0)
    return `${ids.length} capítulo${ids.length === 1 ? '' : 's'} · ${pages} págs. · ${fmtDur(pages * (hdInfo?.secPerPage || 13))}`
  }
  const formIds = () => {
    const cand = hdCandidates()
    if (hdForm === 'pending') return cand.map(c => c.id)
    if (hdForm === 'pick') return cand.filter(c => picked.has(c.id)).map(c => c.id)
    if (hdForm === 'range') {
      const dls = chapters.filter(c => dlSet.has(c.id))
      let a = dls.findIndex(c => c.id === $('#hdfrom')?.value), b = dls.findIndex(c => c.id === $('#hdto')?.value)
      if (a < 0 || b < 0) return []
      if (a > b) [a, b] = [b, a]
      const inRange = new Set(dls.slice(a, b + 1).map(c => c.id))
      return cand.filter(c => inRange.has(c.id)).map(c => c.id)
    }
    return []
  }
  const updateSummary = () => {
    const ids = formIds()
    const sum = $('#hdsum')
    if (sum) sum.textContent = ids.length ? estimate(ids) : hdForm === 'pick' ? 'Marca capítulos en la lista de abajo.' : 'No hay capítulos pendientes en esa selección.'
    if ($('#hdrun')) $('#hdrun').disabled = !ids.length
    const bar = $('#selbar')
    if (bar) {
      bar.hidden = hdForm !== 'pick'
      if (hdForm === 'pick') bar.innerHTML = `<span>${ids.length ? estimate(ids) : 'Ningún capítulo marcado'}</span>
        <button class="btn small primary" id="selrun" ${ids.length ? '' : 'disabled'}>${icon('sparkles')} Reescalar</button>
        <button class="btn small" id="selexit" title="Salir de la selección">${icon('x')}</button>`
      $('#selrun')?.addEventListener('click', runHd)
      $('#selexit')?.addEventListener('click', () => setForm(null))
    }
  }
  async function runHd() {
    const ids = formIds()
    if (!ids.length) return
    try {
      const u = await api(`/api/upscale/${id}`, { method: 'POST', body: { chapterIds: ids } })
      toast(`${ids.length} capítulo${ids.length === 1 ? '' : 's'} en cola para HD`)
      picked.clear()
      setForm(null)
      renderHd(u)
    } catch (err) { toast(err.message) }
  }
  function setForm(mode) {
    const wasPick = hdForm === 'pick'
    hdForm = mode
    renderHdForm()
    if (wasPick !== (mode === 'pick')) renderList()
    updateSummary()
  }
  function renderHdForm() {
    const box = $('#hdform')
    if (!box) return
    box.hidden = !hdForm
    if (!hdForm) { box.innerHTML = ''; return }
    const dls = chapters.filter(c => dlSet.has(c.id))
    const cand = hdCandidates()
    const opt = (c, sel) => `<option value="${c.id}" ${sel ? 'selected' : ''}>${esc(c.num ? `Cap. ${c.num}` : 'Oneshot')}${hdSet.has(c.id) ? ' (HD)' : ''}</option>`
    const from = cand[0] || dls[0], to = cand[Math.min(cand.length, 10) - 1] || dls.at(-1)
    box.innerHTML = `
      <div class="seg" role="tablist">
        <button data-hm="pending" class="${hdForm === 'pending' ? 'on' : ''}">Pendientes</button>
        <button data-hm="range" class="${hdForm === 'range' ? 'on' : ''}">Rango</button>
        <button data-hm="pick" class="${hdForm === 'pick' ? 'on' : ''}">Elegir</button>
      </div>
      ${hdForm === 'range' ? `<div class="row range"><label>Desde <select id="hdfrom">${dls.map(c => opt(c, c === from)).join('')}</select></label>
        <label>hasta <select id="hdto">${dls.map(c => opt(c, c === to)).join('')}</select></label></div>` : ''}
      ${hdForm === 'pick' ? '<div class="note muted">Marca los capítulos en la lista de abajo. Mayús + clic marca un tramo entero.</div>' : ''}
      ${hdForm === 'pending' ? `<div class="note muted">Todos los capítulos descargados que aún no están en HD.</div>
        <label class="check"><input type="checkbox" id="hdautoform" ${hdInfo?.auto ? 'checked' : ''}> Reescalar también los que se descarguen en el futuro</label>` : ''}
      <div class="row"><b id="hdsum" class="sum"></b></div>
      <div class="psec-actions"><button class="btn small primary" id="hdrun">${icon('sparkles')} Reescalar</button><button class="btn small" id="hdclose">Cerrar</button></div>`
    box.querySelectorAll('[data-hm]').forEach(b => b.addEventListener('click', () => setForm(b.dataset.hm)))
    $('#hdfrom')?.addEventListener('change', updateSummary)
    $('#hdto')?.addEventListener('change', updateSummary)
    $('#hdclose').addEventListener('click', () => setForm(null))
    $('#hdrun').addEventListener('click', async () => {
      if (hdForm === 'pending' && $('#hdautoform')?.checked !== !!hdInfo?.auto) await api(`/api/upscale/${id}/auto`, { method: 'POST', body: { auto: $('#hdautoform').checked } }).catch(() => {})
      runHd()
    })
  }
  const renderHd = u => {
    const box = $('#hd')
    if (!box) return
    clearTimeout(hdTimer)
    hdInfo = u
    const show = !!(u?.available && u.downloaded && !offline)
    box.hidden = !show
    if (show) {
      const queued = Object.values(u.jobs).filter(s => s !== 'error').length
      const active = !!u.current || queued > 0
      const c = u.current
      const status = `${u.hd} de ${u.downloaded} capítulos${u.size ? ` · ${fmtSize(u.size)}` : ''}`
      const remaining = Object.entries(u.jobs).filter(([, st]) => st !== 'error').map(([cid]) => cid)
      let body = ''
      if (active) {
        const pct = c?.total ? (c.pages / c.total) * 100 : 0
        body = `<div class="bar dlbar"><i style="width:${pct.toFixed(1)}%"></i></div>
          <div class="note muted">${c ? `Cap. ${esc(c.num ?? '?')} · pág. ${c.pages}/${c.total}` : 'Esperando turno…'}${queued > 1 ? ` · ${queued - 1} más en cola` : ''} · faltan ${fmtDur(remaining.reduce((n, cid) => n + (u.pages?.[cid] || 0), 0) * u.secPerPage - (c?.pages || 0) * u.secPerPage)}</div>`
      } else if (!u.hd) {
        body = `<div class="note muted">Mejora la nitidez con IA (Real-ESRGAN ×2). Unos ${u.secPerPage} s por página; el original no se toca.</div>`
      }
      if (u.error) body += `<div class="error note">Falló algún capítulo: ${esc(u.error)}</div>`
      const canAdd = hdCandidates().length > 0
      const actions = [
        canAdd ? `<button class="btn small ${hdForm ? 'on' : ''}" id="hdopen" aria-expanded="${!!hdForm}">${icon('sparkles')} ${active ? 'Añadir capítulos…' : 'Reescalar…'}</button>` : '',
        active ? `<button class="btn small" id="hdcancel">${icon('stop')} Detener</button>` : '',
        u.hd ? `<button class="btn small danger push" id="hddel">${icon('trash')} Quitar HD</button>` : '',
      ].join('')
      // El formulario se conserva entre sondeos: solo se repinta la parte de arriba.
      if (!$('#hdtop')) box.innerHTML = '<div id="hdtop" class="psec-grid"></div><div id="hdform" class="hdform" hidden></div>'
      $('#hdtop').innerHTML = secHead('sparkles', 'Reescalado HD', status) + body + (actions ? `<div class="psec-actions">${actions}</div>` : '')
        + (u.auto ? '<div class="note muted">Los capítulos que se descarguen también se reescalan.</div>' : '')
      $('#hdopen')?.addEventListener('click', () => setForm(hdForm ? null : 'pending'))
      $('#hdcancel')?.addEventListener('click', async () => {
        if (!confirm('¿Detener el reescalado?\nSe vacía la cola de este manga; lo ya reescalado se queda.')) return
        renderHd(await api(`/api/upscale/${id}/cancel`, { method: 'POST' }))
      })
      $('#hddel')?.addEventListener('click', async () => {
        if (!confirm(`¿Quitar la versión HD de «${manga.title}»?\nSe borra mangas/${download?.folder ?? ''}/.hd${u.size ? ` (${fmtSize(u.size)})` : ''}; los capítulos originales se quedan.`)) return
        renderHd(await api(`/api/upscale/${id}`, { method: 'DELETE' }))
        toast('Versión HD eliminada')
      })
      if (active) hdTimer = setTimeout(async () => { const next = await api(`/api/upscale/${id}`).catch(() => null); if (next && $('#hd')) renderHd(next) }, 3000)
    }
    const changed = (u?.chapters?.length ?? 0) !== hdSet.size || JSON.stringify(u?.jobs || {}) !== JSON.stringify(hdJobs)
    hdSet = new Set(u?.chapters || []); hdJobs = u?.jobs || {}
    if (changed) { renderList(); if (hdForm && hdForm !== 'pick') renderHdForm(); updateSummary() }
    if (hdForm && !hdCandidates().length) setForm(null)
  }
  cleanup = () => { clearTimeout(dlTimer); clearTimeout(hdTimer) }

  const renderFollow = () => {
    const b = $('#follow')
    b.innerHTML = isFollowing ? `${icon('bell')} Siguiendo` : `${icon('bellOff')} Seguir`
    b.classList.toggle('on', isFollowing)
    b.title = isFollowing ? 'Recibes avisos de capítulos nuevos. Pulsa para dejar de seguir.' : 'Avisarme cuando salgan capítulos nuevos'
    b.hidden = offline
  }
  renderFollow()
  $('#follow').addEventListener('click', async () => {
    const r = await api(`/api/follow/${id}`, isFollowing ? { method: 'DELETE' } : { method: 'POST', body: { title: manga.title, cover: manga.cover, lang } })
    isFollowing = r.following
    renderFollow()
    toast(isFollowing ? 'Te avisaremos de los capítulos nuevos' : 'Ya no sigues este manga')
  })
  $('#drop')?.addEventListener('click', async () => {
    if (!confirm(`¿Dejar de leer «${manga.title}»?\nSe quitará del historial, se borrará el progreso de sus capítulos y dejarás de seguirlo.`)) return
    await api(`/api/history/${id}`, { method: 'DELETE' })
    toast('Quitado del historial')
    viewManga(id, langOverride)
  })
  // Cerrar el menú ⋯ al pulsar fuera.
  const menu = $('.menu', app)
  const closeMenu = e => { if (menu && !menu.contains(e.target)) menu.open = false }
  document.addEventListener('click', closeMenu)
  cleanup = () => { clearTimeout(dlTimer); clearTimeout(hdTimer); document.removeEventListener('click', closeMenu) }
  app.querySelectorAll('[data-lang]').forEach(a => a.addEventListener('click', e => { e.preventDefault(); store.set(`lang:${id}`, a.dataset.lang); viewManga(id, a.dataset.lang) }))

  const ul = $('.chapters', app)
  let desc = store.get('chapterOrderDesc', true)
  const chapMeta = (c, r, done) => (newSet.has(String(c.num ?? c.id)) ? '<span class="badge">NUEVO</span> ' : '')
    + (dlSet.has(c.id) ? `<span title="Descargado">${icon('download')}</span> ` : '')
    + (hdSet.has(c.id) ? '<span class="hd" title="Reescalado a HD">HD</span> '
      : hdJobs[c.id] ? `<span class="hd pending" title="${hdJobs[c.id] === 'error' ? 'Falló el reescalado' : 'En cola para HD'}">HD${hdJobs[c.id] === 'error' ? '!' : '…'}</span> ` : '')
    + (r ? (done ? 'Leído' : `pág. ${r.page + 1}/${r.total_pages}`) : esc(c.group))
  function renderList() {
    if (!ul) return
    const list = desc ? [...chapters].reverse() : chapters
    const pickable = new Set(hdForm === 'pick' ? hdCandidates().map(c => c.id) : [])
    ul.classList.toggle('picking', hdForm === 'pick')
    ul.innerHTML = list.map((c, i) => {
      const r = readMap.get(c.id)
      const done = r && r.total_pages && r.page >= r.total_pages - 1
      if (hdForm === 'pick') {
        const ok = pickable.has(c.id)
        return `<li><label class="pick ${ok ? '' : 'off'}" title="${ok ? '' : dlSet.has(c.id) ? 'Ya está en HD o en cola' : 'No está descargado'}">
          <input type="checkbox" data-i="${i}" data-cid="${c.id}" ${ok ? '' : 'disabled'} ${picked.has(c.id) ? 'checked' : ''}>
          <span class="t">${esc(chapLabel(c))}</span><span class="meta">${chapMeta(c, r, done)}</span></label></li>`
      }
      const cls = progress?.chapter_id === c.id ? 'current' : done ? 'read' : ''
      return `<li><a class="${cls}" href="${readUrl(id, c.id, r && !done ? r.page : (done ? 0 : null))}"><span>${esc(chapLabel(c))}</span><span class="meta">${chapMeta(c, r, done)}</span></a></li>`
    }).join('')
  }
  // Selección para HD (Mayús + clic marca el tramo desde el último marcado).
  ul?.addEventListener('click', e => {
    const box = e.target.closest('input[data-cid]')
    if (!box) return
    const i = Number(box.dataset.i)
    if (e.shiftKey && lastPick != null) {
      const [a, b] = [Math.min(lastPick, i), Math.max(lastPick, i)]
      ul.querySelectorAll('input[data-cid]:not(:disabled)').forEach(x => {
        const k = Number(x.dataset.i)
        if (k >= a && k <= b) { x.checked = box.checked; box.checked ? picked.add(x.dataset.cid) : picked.delete(x.dataset.cid) }
      })
    } else box.checked ? picked.add(box.dataset.cid) : picked.delete(box.dataset.cid)
    lastPick = i
    updateSummary()
  })
  renderDl(download)
  renderList()
  renderHd(upscale)
  $('#order')?.addEventListener('click', () => { desc = !desc; lastPick = null; store.set('chapterOrderDesc', desc); renderList() })
  $('#lang')?.addEventListener('change', e => { store.set(`lang:${id}`, e.target.value); viewManga(id, e.target.value) })
}

// ---------- Lector ----------
const READ_MODES = { paged: 'Una página', double: 'Doble página', vertical: 'Vertical' }
// Ajustes por defecto según el tipo de obra (se usan hasta que el usuario cambie algo en ese manga).
function defaultPrefs(manga) {
  // gap: separación entre páginas en vertical (los webtoon son una tira continua; los mangas, páginas sueltas).
  if (['Manhwa', 'Manhua', 'Webtoon'].includes(manga.type)) return { mode: 'vertical', fit: 'width', dir: 'ltr', gap: false }
  if (manga.type === 'Manga') return { mode: 'paged', fit: 'height', dir: 'rtl', gap: true }
  const legacy = store.get('readerSettings', {})
  return { mode: READ_MODES[legacy.mode] ? legacy.mode : 'paged', fit: legacy.fit === 'width' ? 'width' : 'height', dir: legacy.dir === 'rtl' ? 'rtl' : 'ltr', gap: true }
}

async function viewReader(mangaId, chapterId, startPage) {
  document.body.classList.add('reading')
  app.innerHTML = '<div class="reader"><div class="loading">Cargando capítulo…</div></div>'
  const lang = store.get(`lang:${mangaId}`, me.lang)
  // Filtro, brillo y ahorro de datos son globales (navegador); modo, ajuste y dirección van por manga (servidor).
  const globalSettings = { saver: false, filter: 'none', brightness: 100, ...store.get('readerSettings', {}) }
  const [info, chap] = await Promise.all([
    api(`/api/manga/${mangaId}?lang=${encodeURIComponent(lang)}`),
    api(`/api/chapter/${chapterId}?saver=${globalSettings.saver ? 1 : 0}&hd=${globalSettings.hd === false ? 0 : 1}`),
  ])
  const { manga, chapters } = info
  const settings = { ...globalSettings, ...defaultPrefs(manga), ...(info.prefs || {}) }
  const idx = chapters.findIndex(c => c.id === chapterId)
  const chapter = chapters[idx] || { id: chapterId, num: info.progress?.chapter_num, title: '' }
  const prev = idx > 0 ? chapters[idx - 1] : null
  const next = idx >= 0 && idx < chapters.length - 1 ? chapters[idx + 1] : null
  const pages = chap.pages
  const total = pages.length
  let page = Math.min(Math.max(startPage >= 0 ? startPage : chap.savedPage || 0, 0), total - 1)
  let shown = [page] // páginas visibles (2 en doble página)
  const isPaged = () => settings.mode !== 'vertical'
  const isDouble = () => settings.mode === 'double' && window.innerWidth >= 700 && window.innerWidth > window.innerHeight
  const lastShown = () => (isPaged() ? shown.at(-1) : page)

  // Guardado del progreso (con debounce y al salir de la página).
  let saveTimer = null
  const payload = () => ({
    mangaId, chapterId, mangaTitle: manga.title, cover: manga.cover, chapterNum: chapter.num ?? null,
    chapterTitle: chapter.title, lang: manga.source === 'lc' ? 'es' : chapter.lang || lang, page: lastShown(), totalPages: total,
    isLast: idx >= 0 && !next, // al terminarlo, el manga sale de "Continuar leyendo"
  })
  const saveNow = () => { clearTimeout(saveTimer); saveTimer = null; api('/api/progress', { method: 'POST', body: payload() }).catch(() => {}) }
  const scheduleSave = () => { clearTimeout(saveTimer); saveTimer = setTimeout(saveNow, 700) }
  const beacon = () => { if (saveTimer) { clearTimeout(saveTimer); saveTimer = null; navigator.sendBeacon('/api/progress', JSON.stringify(payload())) } }
  const onVis = () => document.visibilityState === 'hidden' && beacon()
  document.addEventListener('visibilitychange', onVis)
  window.addEventListener('pagehide', beacon)
  saveNow()

  const chapOpts = chapters.map(c => `<option value="${c.id}" ${c.id === chapterId ? 'selected' : ''}>${esc(chapLabel(c))}</option>`).join('')
  app.innerHTML = `
  <div class="reader">
    <div class="rbar top">
      <a class="btn small" href="#/manga/${mangaId}" title="Volver a la ficha">${icon('back')}</a>
      <div class="ttl"><b>${esc(manga.title)}</b></div>
      <select id="chap" style="max-width:40vw">${chapOpts}</select>
      <button class="btn small" id="modequick"></button>
      <button class="btn small" id="ropts" title="Opciones de lectura">${icon('settings')}</button>
    </div>
    <div class="rpanel" hidden>
      <select id="mode" title="Modo de lectura (se recuerda para este manga)">${Object.entries(READ_MODES).map(([k, v]) => `<option value="${k}">${v}</option>`).join('')}</select>
      <select id="fit" title="Ajuste (se recuerda para este manga)"><option value="height">Ajustar alto</option><option value="width">Ajustar ancho</option></select>
      <select id="dir" title="Dirección (se recuerda para este manga)"><option value="ltr">Izq → Der</option><option value="rtl">Der → Izq</option></select>
      <label class="row muted" id="gapwrap" style="font-size:.85rem" title="Deja un espacio entre páginas en modo vertical (se recuerda para este manga)"><input type="checkbox" id="gap"> Separar páginas</label>
      <select id="filter" title="Filtro">${Object.entries(FILTERS).map(([k, [label]]) => `<option value="${k}">${label}</option>`).join('')}</select>
      <label class="row muted" style="font-size:.85rem" title="Brillo">☀ <input type="range" id="bright" min="40" max="120" step="5" style="width:90px"></label>
      ${manga.source === 'lc' || chap.local ? '' : '<label class="row muted" style="font-size:.85rem"><input type="checkbox" id="saver"> Ahorro datos</label>'}
      ${chap.hdAvailable ? '<label class="row muted" style="font-size:.85rem" title="Usar la versión reescalada de este capítulo"><input type="checkbox" id="hd"> Versión HD</label>'
        : chap.local && info.upscale?.available ? `<button class="btn small" id="hdone" title="Reescala este capítulo con IA en segundo plano (unos minutos)">${icon('sparkles')} Reescalar a HD</button>` : ''}
      <p class="muted">Modo, ajuste, dirección y separación se recuerdan para este manga. ${icon('scroll')} en la barra de arriba cambia entre páginas y vertical. Zoom: pellizca o toca dos veces en el centro (Ctrl+rueda o + / − en PC).</p>
    </div>
    <div id="pages"></div>
    <div class="rbar bottom">
      ${prev ? `<a class="btn small" href="${readUrl(mangaId, prev.id)}">${icon('prev')} Cap. ant.</a>` : ''}
      <span id="pnum" class="muted"></span>
      <input type="range" id="slider" min="1" max="${total}" value="${page + 1}">
      <button class="btn small" id="zoomreset" hidden title="Quitar zoom">${icon('zoomOut')}</button>
      ${next ? `<a class="btn small" href="${readUrl(mangaId, next.id)}">Cap. sig. ${icon('next')}</a>` : ''}
    </div>
  </div>`
  const reader = $('.reader', app)
  const box = $('#pages', app)
  const slider = $('#slider', app)
  $('#mode').value = settings.mode
  $('#fit').value = settings.fit
  $('#dir').value = settings.dir
  $('#gap').checked = !!settings.gap
  // Botón rápido páginas ⇄ vertical (vuelve al último modo por páginas usado).
  let lastPaged = settings.mode === 'double' ? 'double' : 'paged'
  function renderModeQuick() {
    const b = $('#modequick')
    b.innerHTML = icon(isPaged() ? 'scroll' : 'pages')
    b.title = isPaged() ? 'Leer en vertical (desplazamiento continuo)' : 'Leer por páginas'
    $('#mode').value = settings.mode
  }
  $('#filter').value = FILTERS[settings.filter] ? settings.filter : 'none'
  $('#bright').value = settings.brightness
  const applyFilter = () => {
    const f = [FILTERS[settings.filter]?.[1] || '', settings.brightness != 100 ? `brightness(${settings.brightness / 100})` : ''].join(' ').trim()
    box.style.setProperty('--page-filter', f || 'none')
  }
  applyFilter()
  if ($('#saver')) $('#saver').checked = settings.saver
  if ($('#hd')) $('#hd').checked = settings.hd !== false
  const endBlock = `<div class="chapter-end"><p class="muted">Fin del capítulo ${esc(chapter.num ?? '')}</p>
    ${next ? `<a class="btn primary" href="${readUrl(mangaId, next.id)}">${icon('next')} Siguiente: ${esc(chapLabel(next))}</a>` : '<p>No hay más capítulos disponibles.</p>'}
    <a class="btn" href="#/manga/${mangaId}">${icon('back')} Volver a la ficha</a></div>`

  if (!info.prefs && !store.get(`autoPrefs:${mangaId}`)) {
    store.set(`autoPrefs:${mangaId}`, 1)
    if (manga.type) toast(`${manga.type}: ${READ_MODES[settings.mode].toLowerCase()}${settings.mode === 'vertical' ? '' : `, ${settings.dir === 'rtl' ? 'der → izq' : 'izq → der'}`}. Lo que cambies se recordará.`)
  }

  const setPageLabel = () => {
    $('#pnum').textContent = `${shown.length > 1 ? `${shown[0] + 1}-${shown[1] + 1}` : lastShown() + 1} / ${total}`
    slider.value = lastShown() + 1
  }
  let observer = null
  let atEnd = false

  // --- Doble página: la 1.ª va sola (portada) y las apaisadas (ya dobles) también.
  const wide = new Set()
  const isWide = img => img.naturalWidth > img.naturalHeight * 1.1
  function groupOf(i) {
    if (!isDouble()) return [i]
    for (let s = 0; s < total;) {
      const g = s === 0 || wide.has(s) || wide.has(s + 1) || s + 1 >= total ? [s] : [s, s + 1]
      if (g.includes(i)) return g
      s += g.length
    }
    return [i]
  }
  function preload() {
    for (let k = 1; k <= 4; k++) {
      const i = shown.at(-1) + k
      if (i >= total) break
      const im = new Image()
      im.onload = () => isWide(im) && wide.add(i)
      im.src = pages[i]
    }
  }
  function showPaged() {
    let stage = $('.stage', box)
    if (!stage) { box.innerHTML = '<div class="stage"></div>'; stage = $('.stage', box) }
    stage.classList.toggle('two', shown.length === 2)
    stage.innerHTML = shown.map(i => `<img data-i="${i}" src="${pages[i]}" alt="" draggable="false">`).join('')
    stage.querySelectorAll('img').forEach(img => img.addEventListener('load', () => {
      const i = Number(img.dataset.i)
      if (isWide(img) && !wide.has(i)) {
        wide.add(i)
        if (shown.length === 2 && shown.includes(i)) goTo(shown[0], false, true) // reagrupar
      }
    }, { once: true }))
    resetZoom()
    window.scrollTo(0, 0)
    preload()
  }
  function showEnd() {
    atEnd = true
    resetZoom()
    box.innerHTML = endBlock
    reader.classList.remove('hide-ui')
  }

  function goTo(n, fromScroll = false, force = false) {
    if (isPaged()) {
      if (n >= total) return showEnd()
      n = Math.min(Math.max(n, 0), total - 1)
      const g = groupOf(n)
      const changed = atEnd || g[0] !== shown[0] || g.length !== shown.length
      atEnd = false
      shown = g
      page = g[0]
      setPageLabel()
      if (changed || force || !$('.stage img', box)) showPaged()
      if (changed) scheduleSave()
      return
    }
    n = Math.min(Math.max(n, 0), total - 1)
    const changed = n !== page
    page = n
    shown = [n]
    setPageLabel()
    if (!fromScroll) box.querySelectorAll('img')[page]?.scrollIntoView()
    if (changed) scheduleSave()
  }
  const forward = () => { if (!atEnd) goTo(shown.at(-1) + 1) }
  const backward = () => {
    if (atEnd) { box.innerHTML = ''; goTo(total - 1, false, true); return }
    if (page > 0) goTo(groupOf(page - 1)[0])
  }

  function render() {
    observer?.disconnect()
    const keep = lastShown()
    resetZoom()
    box.className = isPaged() ? `paged ${settings.fit === 'width' ? 'fit-width' : ''} ${isDouble() ? 'double' : ''}` : `vertical fit-${settings.fit} ${settings.gap ? 'gap' : ''}`
    renderModeQuick()
    box.dataset.dir = settings.dir
    // En der → izq la barra de progreso también avanza de derecha a izquierda (en vertical no aplica).
    slider.dir = isPaged() && settings.dir === 'rtl' ? 'rtl' : 'ltr'
    $('#dir').hidden = !isPaged()
    $('#gapwrap').hidden = isPaged()
    if (isPaged()) {
      box.innerHTML = ''
      atEnd = false
      shown = []
      goTo(keep)
      return
    }
    page = keep
    shown = [keep]
    box.innerHTML = pages.map((src, i) => `<img data-i="${i}" ${i < page + 3 ? `src="${src}"` : `data-src="${src}"`} alt="">`).join('') + endBlock
    box.querySelectorAll('img').forEach(img => img.addEventListener('load', () => img.setAttribute('data-loaded', ''), { once: true }))
    const lazy = new IntersectionObserver(entries => entries.forEach(e => {
      if (e.isIntersecting && e.target.dataset.src) { e.target.src = e.target.dataset.src; delete e.target.dataset.src }
    }), { rootMargin: '2000px 0px' })
    // No seguir el scroll hasta haber saltado a la página guardada, para no pisarla con la 0.
    let ready = false
    observer = new IntersectionObserver(entries => {
      if (!ready) return
      for (const e of entries) if (e.isIntersecting) goTo(Number(e.target.dataset.i), true)
    }, { rootMargin: '-45% 0px -45% 0px' })
    const imgs = [...box.querySelectorAll('img')]
    imgs.forEach(img => { lazy.observe(img); observer.observe(img) })
    const lazyDisconnect = observer.disconnect.bind(observer)
    observer.disconnect = () => { lazyDisconnect(); lazy.disconnect() }
    const before = imgs.slice(0, page + 1).map(img => img.complete ? null : new Promise(r => { img.addEventListener('load', r, { once: true }); img.addEventListener('error', r, { once: true }) }))
    Promise.race([Promise.all(before), new Promise(r => setTimeout(r, 8000))]).then(() => {
      imgs[page]?.scrollIntoView()
      lastY = window.scrollY
      setTimeout(() => (ready = true), 300)
    })
    setPageLabel()
  }

  // --- Zoom (modos por página): pellizco, doble toque/clic en el centro, Ctrl+rueda y teclas + - 0.
  const zoom = { s: 1, x: 0, y: 0 }
  const stageEl = () => $('.stage', box)
  function applyZoom() {
    const st = stageEl()
    if (st) st.style.transform = zoom.s === 1 ? '' : `translate(${zoom.x}px, ${zoom.y}px) scale(${zoom.s})`
    box.classList.toggle('zoomed', zoom.s > 1)
    $('#zoomreset').hidden = zoom.s === 1
  }
  function clampPan() {
    const st = stageEl()
    if (!st) return
    const W = st.offsetWidth, H = st.offsetHeight
    zoom.x = Math.min(0, Math.max(W - W * zoom.s, zoom.x))
    zoom.y = Math.min(0, Math.max(H - H * zoom.s, zoom.y))
  }
  // (px, py): punto en coordenadas del contenedor que queda fijo al cambiar la escala.
  function zoomAt(s, px, py) {
    s = Math.min(5, Math.max(1, s))
    const cx = (px - zoom.x) / zoom.s, cy = (py - zoom.y) / zoom.s
    zoom.s = s
    zoom.x = px - cx * s
    zoom.y = py - cy * s
    if (s === 1) { zoom.x = 0; zoom.y = 0 }
    clampPan()
    applyZoom()
  }
  function resetZoom() { zoom.s = 1; zoom.x = 0; zoom.y = 0; applyZoom() }
  const local = (cx, cy) => { const r = box.getBoundingClientRect(); return [cx - r.left, cy - r.top] }

  const toggleUi = () => { reader.classList.toggle('hide-ui'); if (reader.classList.contains('hide-ui')) $('.rpanel', reader).hidden = true }
  const pts = new Map()
  let gesture = null, tap = null, lastTap = { t: 0, x: 0, y: 0 }, uiTimer = null
  function onTap(cx, cy) {
    const now = Date.now()
    const dbl = now - lastTap.t < 300 && Math.hypot(cx - lastTap.x, cy - lastTap.y) < 40
    lastTap = dbl ? { t: 0, x: 0, y: 0 } : { t: now, x: cx, y: cy }
    const xr = cx / window.innerWidth
    const center = xr > 0.3 && xr < 0.7
    if (dbl && (center || zoom.s > 1)) {
      clearTimeout(uiTimer)
      if (zoom.s > 1) resetZoom()
      else zoomAt(2.5, ...local(cx, cy))
      return
    }
    if (zoom.s > 1) return // con zoom, un toque no pasa página
    if (center) { clearTimeout(uiTimer); uiTimer = setTimeout(toggleUi, 280); return }
    ;(xr >= 0.7) === (settings.dir === 'ltr') ? forward() : backward()
  }
  box.addEventListener('pointerdown', e => {
    if (!isPaged() || atEnd || e.target.closest('a,button,select,input')) return
    if (e.pointerType === 'mouse' && e.button !== 0) return
    pts.set(e.pointerId, { x: e.clientX, y: e.clientY })
    if (pts.size === 1) {
      tap = { x: e.clientX, y: e.clientY, t: Date.now(), moved: false }
      gesture = zoom.s > 1 ? { type: 'pan', x: e.clientX, y: e.clientY } : null
      if (gesture) box.setPointerCapture?.(e.pointerId)
    } else if (pts.size === 2) {
      const [a, b] = [...pts.values()]
      gesture = { type: 'pinch', d: Math.hypot(a.x - b.x, a.y - b.y), mx: (a.x + b.x) / 2, my: (a.y + b.y) / 2 }
      tap = null
    }
  })
  box.addEventListener('pointermove', e => {
    if (!pts.has(e.pointerId)) return
    pts.set(e.pointerId, { x: e.clientX, y: e.clientY })
    if (tap && Math.hypot(e.clientX - tap.x, e.clientY - tap.y) > 10) tap.moved = true
    if (gesture?.type === 'pinch' && pts.size >= 2) {
      const [a, b] = [...pts.values()]
      const d = Math.hypot(a.x - b.x, a.y - b.y), mx = (a.x + b.x) / 2, my = (a.y + b.y) / 2
      zoom.x += mx - gesture.mx
      zoom.y += my - gesture.my
      zoomAt(zoom.s * (d / gesture.d), ...local(mx, my))
      Object.assign(gesture, { d, mx, my })
    } else if (gesture?.type === 'pan') {
      zoom.x += e.clientX - gesture.x
      zoom.y += e.clientY - gesture.y
      gesture.x = e.clientX
      gesture.y = e.clientY
      clampPan()
      applyZoom()
    }
  })
  const endPointer = e => {
    if (!pts.delete(e.pointerId)) return
    if (pts.size === 1 && zoom.s > 1) {
      const [p] = [...pts.values()]
      gesture = { type: 'pan', x: p.x, y: p.y }
    } else if (pts.size === 0) {
      if (e.type === 'pointerup' && tap && !tap.moved && Date.now() - tap.t < 350) onTap(e.clientX, e.clientY)
      gesture = null
      tap = null
    }
  }
  box.addEventListener('pointerup', endPointer)
  box.addEventListener('pointercancel', endPointer)
  box.addEventListener('wheel', e => {
    if (!isPaged() || atEnd || !e.ctrlKey) return // Ctrl+rueda o pellizco del trackpad
    e.preventDefault()
    zoomAt(zoom.s * Math.exp(-e.deltaY / 200), ...local(e.clientX, e.clientY))
  }, { passive: false })
  // En modo vertical el zoom es el nativo del navegador; un toque muestra/oculta las barras.
  box.addEventListener('click', e => {
    if (isPaged() || e.target.closest('a,button')) return
    reader.classList.toggle('hide-ui')
  })
  $('#zoomreset').addEventListener('click', resetZoom)
  $('#ropts').addEventListener('click', () => { const p = $('.rpanel', reader); p.hidden = !p.hidden; $('#ropts').classList.toggle('on', !p.hidden) })

  const saveGlobal = () => store.set('readerSettings', { saver: settings.saver, filter: settings.filter, brightness: settings.brightness, hd: settings.hd !== false })
  const savePrefs = () => {
    api(`/api/prefs/${mangaId}`, { method: 'POST', body: { mode: settings.mode, fit: settings.fit, dir: settings.dir, gap: !!settings.gap } })
      .then(() => toast('Guardado para este manga')).catch(err => toast(err.message))
  }
  $('#mode').addEventListener('change', e => { settings.mode = e.target.value; if (isPaged()) lastPaged = settings.mode; savePrefs(); render() })
  $('#modequick').addEventListener('click', () => {
    settings.mode = isPaged() ? 'vertical' : lastPaged
    savePrefs()
    render()
  })
  $('#gap').addEventListener('change', e => { settings.gap = e.target.checked; savePrefs(); render() })
  $('#fit').addEventListener('change', e => { settings.fit = e.target.value; savePrefs(); render() })
  $('#dir').addEventListener('change', e => { settings.dir = e.target.value; box.dataset.dir = settings.dir; slider.dir = settings.dir; savePrefs() })
  $('#filter').addEventListener('change', e => { settings.filter = e.target.value; saveGlobal(); applyFilter() })
  $('#bright').addEventListener('input', e => { settings.brightness = Number(e.target.value); saveGlobal(); applyFilter() })
  $('#bright').addEventListener('dblclick', e => { e.target.value = settings.brightness = 100; saveGlobal(); applyFilter() })
  $('#saver')?.addEventListener('change', e => { settings.saver = e.target.checked; saveGlobal(); history.replaceState(null, '', readUrl(mangaId, chapterId, lastShown())); router() })
  $('#hd')?.addEventListener('change', e => { settings.hd = e.target.checked; saveGlobal(); history.replaceState(null, '', readUrl(mangaId, chapterId, lastShown())); router() })
  $('#hdone')?.addEventListener('click', async e => {
    e.target.closest('button').disabled = true
    try { await api(`/api/upscale/${mangaId}`, { method: 'POST', body: { chapterId } }); toast('En cola: estará en HD en unos minutos') } catch (err) { toast(err.message); e.target.closest('button').disabled = false }
  })
  $('#chap').addEventListener('change', e => { location.hash = readUrl(mangaId, e.target.value) })
  slider.addEventListener('input', () => goTo(Number(slider.value) - 1))

  const onKey = e => {
    if (!isPaged() || e.target.matches('input,select')) return
    const fwdKey = settings.dir === 'ltr' ? 'ArrowRight' : 'ArrowLeft'
    const backKey = settings.dir === 'ltr' ? 'ArrowLeft' : 'ArrowRight'
    const [cx, cy] = [box.clientWidth / 2, Math.min(box.clientHeight, window.innerHeight) / 2]
    if (e.key === fwdKey || e.key === ' ') { e.preventDefault(); forward() }
    else if (e.key === backKey) backward()
    else if (e.key === '+' || e.key === '=') zoomAt(zoom.s * 1.25, cx, cy)
    else if (e.key === '-') zoomAt(zoom.s / 1.25, cx, cy)
    else if (e.key === '0') resetZoom()
  }
  document.addEventListener('keydown', onKey)
  let lastY = 0
  const onScroll = () => {
    if (settings.mode !== 'vertical') return
    const y = window.scrollY
    if (Math.abs(y - lastY) > 30) { reader.classList.toggle('hide-ui', y > lastY); lastY = y }
  }
  window.addEventListener('scroll', onScroll, { passive: true })
  // Al girar la tablet o redimensionar, rehacer la agrupación de doble página.
  let resizeTimer = null
  const onResize = () => {
    clearTimeout(resizeTimer)
    resizeTimer = setTimeout(() => {
      if (!isPaged() || atEnd) return
      box.classList.toggle('double', isDouble())
      goTo(lastShown(), false, true)
    }, 200)
  }
  window.addEventListener('resize', onResize)

  render()
  cleanup = () => {
    if (saveTimer) saveNow()
    observer?.disconnect()
    clearTimeout(uiTimer)
    document.removeEventListener('visibilitychange', onVis)
    window.removeEventListener('pagehide', beacon)
    document.removeEventListener('keydown', onKey)
    window.removeEventListener('scroll', onScroll)
    window.removeEventListener('resize', onResize)
  }
}

// ---------- Historial ----------
async function viewHistory() {
  app.innerHTML = '<div class="loading">Cargando…</div>'
  const hist = await api('/api/history')
  app.innerHTML = `<h1>Historial de lectura</h1>
    ${hist.length ? '' : '<p class="muted">Aún no has leído nada.</p>'}
    <div class="history">${hist.map(h => `
      <div class="cont">
        ${continueCard(h).replace('class="cont"', 'style="display:flex;gap:12px;flex:1;min-width:0;align-items:center"')}
        <div class="row" style="flex:none">
          <a class="btn small" href="#/manga/${h.manga_id}">${icon('book')} Ficha</a>
          <button class="btn small danger" data-del="${h.manga_id}">${icon('trash')} Borrar</button>
        </div>
      </div>`).join('')}</div>`
  app.querySelectorAll('[data-del]').forEach(b => b.addEventListener('click', async () => {
    if (!confirm('¿Borrar el historial de este manga?')) return
    await api(`/api/history/${b.dataset.del}`, { method: 'DELETE' })
    viewHistory()
  }))
}

// ---------- Descargas ----------
async function viewDownloads() {
  if (cleanup) { cleanup(); cleanup = null }
  const list = await api('/api/downloads')
  if (location.hash !== '#/downloads') return
  const total = list.reduce((n, d) => n + (d.size || 0), 0)
  app.innerHTML = `<h1>Descargas</h1>
    <p class="muted">Se guardan en <code>/zdata/media/mangas</code> como CBZ (compatibles con Kavita, Komga, Mihon…). Los capítulos descargados se leen desde el disco.${list.length ? ` Total: <b>${fmtSize(total)}</b>.` : ''}</p>
    ${list.length ? '' : '<p class="muted">Aún no has descargado nada. Usa “⬇ Descargar” en la ficha de un manga.</p>'}
    <div class="history">${list.map(d => {
      const active = DL_ACTIVE.includes(d.status)
      return `<div class="cont">
        <a class="info" href="#/manga/${d.manga_id}"><b>${esc(d.title)}</b>
          <div class="muted">${esc(downloadLabel(d))}${active ? ` · ${Math.floor(downloadPct(d))}%` : ''} · ${fmtSize(d.size)} · mangas/${esc(d.folder)}</div>
          ${active ? `<div class="muted" style="font-size:.8rem">${downloadDetail(d)}</div>` : ''}
          ${d.status === 'error' ? `<div class="error" style="font-size:.8rem">${esc(d.error || '')}</div>` : ''}
          <div class="bar dlbar"><i style="width:${downloadPct(d).toFixed(1)}%"></i></div></a>
        <div class="row" style="flex:none">
          ${active ? `<button class="btn small" data-cancel="${esc(d.manga_id)}">${icon('stop')} Cancelar</button>` : ''}
          <button class="btn small danger" data-del="${esc(d.manga_id)}" data-title="${esc(d.title)}" data-size="${d.size || 0}">${icon('trash')} Eliminar</button>
        </div></div>`
    }).join('')}</div>`
  app.querySelectorAll('[data-cancel]').forEach(b => b.addEventListener('click', async () => { await api(`/api/download/${b.dataset.cancel}/cancel`, { method: 'POST' }); viewDownloads() }))
  app.querySelectorAll('[data-del]').forEach(b => b.addEventListener('click', async () => {
    if (!confirm(`¿Eliminar la copia local de «${b.dataset.title}» (${fmtSize(Number(b.dataset.size))})?\nTu historial de lectura no se toca.`)) return
    await api(`/api/download/${b.dataset.del}`, { method: 'DELETE' })
    toast('Copia local eliminada')
    viewDownloads()
  }))
  if (list.some(d => DL_ACTIVE.includes(d.status))) {
    const t = setTimeout(() => location.hash === '#/downloads' && viewDownloads(), 2000)
    cleanup = () => clearTimeout(t)
  }
}

// ---------- Estadísticas ----------
const fmtNum = n => n.toLocaleString('es')
const fmtDay = d => new Date(`${d}T12:00:00`).toLocaleDateString('es', { day: 'numeric', month: 'short' })
const niceMax = v => { const p = 10 ** Math.floor(Math.log10(v)); return [1, 2, 2.5, 5, 10].map(m => m * p).find(m => m >= v) }

// Barras verticales de una sola serie; cada columna tiene una zona de hover más grande que la barra.
function barChart(data, { value, tip, label }, W = 560) {
  const H = 190, L = 34, B = 24, T = 8
  const max = niceMax(Math.max(1, ...data.map(value)))
  const cw = (W - L) / data.length
  const bw = Math.max(4, Math.min(28, cw - 6))
  const y = v => T + (H - T - B) * (1 - v / max)
  const ticks = Number.isInteger(max / 2) ? [0, max / 2, max] : [0, max]
  const grid = ticks.map(v => `<line x1="${L}" x2="${W}" y1="${y(v)}" y2="${y(v)}" class="grid"/><text x="${L - 6}" y="${y(v) + 4}" text-anchor="end" class="axis">${fmtNum(Math.round(v))}</text>`).join('')
  const bars = data.map((d, i) => {
    const v = value(d)
    const x = L + i * cw + (cw - bw) / 2
    const top = y(v), base = y(0), r = Math.min(4, bw / 2, base - top)
    const bar = v > 0 ? `<path class="mark" d="M${x},${base}V${top + r}Q${x},${top} ${x + r},${top}H${x + bw - r}Q${x + bw},${top} ${x + bw},${top + r}V${base}Z"/>` : ''
    const every = W < 420 ? 3 : 2
    const lab = (data.length - 1 - i) % every ? '' : `<text x="${i === data.length - 1 ? x + bw : x + bw / 2}" y="${H - 6}" text-anchor="${i === data.length - 1 ? 'end' : 'middle'}" class="axis">${label(d)}</text>`
    return `<g class="col" data-tip="${esc(tip(d))}"><rect x="${L + i * cw}" y="${T}" width="${cw}" height="${H - T - B}" class="hit"/>${bar}${lab}</g>`
  }).join('')
  return `<svg viewBox="0 0 ${W} ${H}" class="chart" role="img">${grid}${bars}</svg>`
}

async function viewStats() {
  app.innerHTML = '<div class="loading">Cargando…</div>'
  const st = await api('/api/stats')
  const t = st.totals
  if (!t.pages) {
    app.innerHTML = '<h1>Estadísticas</h1><p class="muted">Aún no hay lecturas registradas. Lee algún capítulo y vuelve por aquí.</p>'
    return
  }
  const maxDay = Math.max(1, ...st.calendar.map(d => d.pages))
  const level = p => (p === 0 ? 0 : Math.min(5, Math.ceil((p / maxDay) * 5)))
  const weekLabel = w => fmtDay(w.start)
  const tile = (value, label, sub = '') => `<div class="tile"><div class="tv">${value}</div><div class="tl">${label}</div>${sub ? `<div class="ts">${sub}</div>` : ''}</div>`
  // Calendario: columnas = semanas (lunes arriba).
  const firstDow = (new Date(`${st.calendar[0].day}T12:00:00`).getDay() + 6) % 7
  const cells = [...Array(firstDow).fill('<i class="cell empty"></i>'), ...st.calendar.map(d =>
    `<i class="cell l${level(d.pages)}" data-tip="${esc(`${fmtDay(d.day)}: ${d.pages ? `${fmtNum(d.pages)} págs.` : 'sin lectura'}${d.chapters ? ` · ${d.chapters} caps.` : ''}`)}"></i>`)].join('')
  const gmax = Math.max(1, ...st.genres.map(g => g.pages))

  app.innerHTML = `<h1>${icon('chart')} Estadísticas</h1>
  <div class="tiles">
    ${tile(`${st.streak.current} ${st.streak.current === 1 ? 'día' : 'días'}`, 'Racha actual', st.streak.current && !st.streak.readToday ? 'Lee hoy para mantenerla' : st.streak.readToday ? 'Hoy ya leíste ✓' : '')}
    ${tile(`${st.streak.best} ${st.streak.best === 1 ? 'día' : 'días'}`, 'Mejor racha')}
    ${tile(fmtNum(t.thisWeekChapters), 'Capítulos esta semana', `${fmtNum(t.thisWeekPages)} páginas`)}
    ${tile(fmtNum(t.chapters), 'Capítulos terminados')}
    ${tile(fmtNum(t.pages), 'Páginas leídas')}
    ${tile(fmtNum(t.mangas), 'Mangas', `${t.activeDays} ${t.activeDays === 1 ? 'día' : 'días'} con lectura`)}
  </div>
  <div class="charts">
    <section class="panel"><h3>Capítulos terminados por semana</h3><div class="chart-slot" data-chart="chapters"></div></section>
    <section class="panel"><h3>Páginas leídas por semana</h3><div class="chart-slot" data-chart="pages"></div></section>
  </div>
  <section class="panel"><h3>Actividad (últimas 18 semanas)</h3>
    <div class="heat-wrap"><div class="heat">${cells}</div></div>
    <div class="heat-legend muted">Menos <i class="cell l0"></i><i class="cell l1"></i><i class="cell l2"></i><i class="cell l3"></i><i class="cell l4"></i><i class="cell l5"></i> Más páginas</div>
  </section>
  <div class="charts">
    <section class="panel"><h3>Géneros favoritos</h3>
      ${st.genres.length ? `<div class="hbars">${st.genres.map(g => `<div class="hbar" data-tip="${esc(`${g.name}: ${fmtNum(g.pages)} págs. (${g.pct}% de lo leído)`)}">
        <span class="hl">${esc(g.name)}</span><span class="ht"><i style="width:${(g.pages / gmax) * 100}%"></i></span><span class="hv">${g.pct}%</span></div>`).join('')}</div>
        <p class="muted" style="font-size:.8rem">Porcentaje de páginas leídas de mangas con ese género (un manga cuenta en todos sus géneros).</p>`
        : '<p class="muted">Abre la ficha de los mangas que lees para registrar sus géneros.</p>'}
    </section>
    <section class="panel"><h3>Lo más leído</h3>
      <div class="toplist">${st.topMangas.map((m, i) => `<a class="cont" href="#/manga/${m.id}"><span class="rank">${i + 1}</span>
        <img src="${esc(m.cover || '/icon.svg')}" alt="" loading="lazy">
        <div class="info"><b>${esc(m.title)}</b><div class="muted">${fmtNum(m.pages)} págs. · ${m.chapters} caps.</div></div></a>`).join('')}</div>
    </section>
  </div>
  <details class="panel"><summary>Ver datos por semana</summary>
    <table class="data"><thead><tr><th>Semana del</th><th>Capítulos</th><th>Páginas</th></tr></thead>
    <tbody>${[...st.weeks].reverse().map(w => `<tr><td>${fmtDay(w.start)}</td><td>${w.chapters}</td><td>${fmtNum(w.pages)}</td></tr>`).join('')}</tbody></table>
  </details>
  <div id="tip" hidden></div>`

  // Las gráficas se dibujan al ancho real del panel para que el texto no encoja en el móvil.
  const charts = {
    chapters: { value: w => w.chapters, label: weekLabel, tip: w => `Semana del ${fmtDay(w.start)}: ${w.chapters} caps.` },
    pages: { value: w => w.pages, label: weekLabel, tip: w => `Semana del ${fmtDay(w.start)}: ${fmtNum(w.pages)} págs.` },
  }
  const drawCharts = () => app.querySelectorAll('.chart-slot').forEach(el => { el.innerHTML = barChart(st.weeks, charts[el.dataset.chart], Math.max(260, el.clientWidth)) })
  drawCharts()
  let rt = null
  const onResize = () => { clearTimeout(rt); rt = setTimeout(drawCharts, 150) }
  window.addEventListener('resize', onResize)

  // Tooltip compartido para barras, celdas y géneros.
  const tipEl = $('#tip')
  const move = e => {
    const target = e.target.closest('[data-tip]')
    if (!target) { tipEl.hidden = true; return }
    tipEl.textContent = target.dataset.tip
    tipEl.hidden = false
    const r = tipEl.getBoundingClientRect()
    tipEl.style.left = `${Math.min(window.innerWidth - r.width - 8, Math.max(8, e.clientX - r.width / 2))}px`
    tipEl.style.top = `${Math.max(8, e.clientY - r.height - 12)}px`
  }
  app.addEventListener('pointermove', move)
  app.addEventListener('pointerdown', move)
  app.addEventListener('pointerleave', () => (tipEl.hidden = true))
  cleanup = () => { app.removeEventListener('pointermove', move); app.removeEventListener('pointerdown', move); window.removeEventListener('resize', onResize) }
}

// ---------- Ajustes ----------
function viewSettings() {
  app.innerHTML = `<h1>Ajustes</h1>
  <div class="settings">
    <section><b>Cuenta</b><div class="muted">Sesión iniciada como <b>${esc(me.username)}</b></div>
      <button class="btn" id="logout">${icon('logout')} Cerrar sesión</button></section>
    <section><b>Idioma preferido de los capítulos</b>
      <select id="lang">${Object.entries(LANGS).map(([k, v]) => `<option value="${k}" ${k === me.lang ? 'selected' : ''}>${v}</option>`).join('')}</select></section>
    <section><b>Cambiar contraseña</b>
      <form id="pw" style="display:grid;gap:8px">
        <input type="password" name="old" placeholder="Contraseña actual" autocomplete="current-password" required>
        <input type="password" name="new" placeholder="Nueva contraseña" autocomplete="new-password" required minlength="6">
        <button class="btn primary">${icon('key')} Guardar</button></form></section>
    <section><b>${icon('bell')} Avisos de capítulos nuevos</b>
      <p class="muted" style="margin:0;font-size:.88rem">El servidor revisa cada pocas horas los mangas que sigues (los que empiezas a leer se siguen solos).
        Si un manga tiene copia local, los capítulos nuevos se descargan automáticamente. Además puedes recibir una notificación:</p>
      <form id="notify" style="display:grid;gap:8px">
        <b style="font-size:.9rem">ntfy</b>
        <input type="text" name="ntfyUrl" placeholder="Servidor, p. ej. http://192.168.1.141:4546" autocomplete="off">
        <input type="text" name="ntfyTopic" placeholder="Tema, p. ej. mangas" autocomplete="off">
        <input type="password" name="ntfyToken" placeholder="Token (tk_…) o usuario:contraseña" autocomplete="new-password">
        <b style="font-size:.9rem">Telegram <span class="muted" style="font-weight:normal">(opcional)</span></b>
        <input type="password" name="tgToken" placeholder="Token del bot (de @BotFather)" autocomplete="new-password">
        <input type="text" name="tgChat" placeholder="Chat ID" autocomplete="off">
        <p class="muted" style="margin:0;font-size:.8rem">Los tokens guardados no se muestran: deja el campo vacío para conservarlo o escribe «-» para borrarlo.</p>
        <div class="row"><button class="btn primary">${icon('check')} Guardar</button><button type="button" class="btn" id="ntest">${icon('send')} Enviar prueba</button></div>
      </form></section>
  </div>`
  api('/api/notify').then(n => {
    const f = $('#notify')
    if (!f) return
    f.ntfyUrl.value = n.ntfyUrl
    f.ntfyTopic.value = n.ntfyTopic
    f.tgChat.value = n.tgChat
    if (n.hasNtfyToken) f.ntfyToken.placeholder = 'Token guardado ✓ (vacío = conservar, «-» = borrar)'
    if (n.hasTgToken) f.tgToken.placeholder = 'Token guardado ✓ (vacío = conservar, «-» = borrar)'
  }).catch(() => {})
  $('#notify').addEventListener('submit', async e => {
    e.preventDefault()
    const f = e.target
    try {
      await api('/api/notify', { method: 'POST', body: Object.fromEntries(['ntfyUrl', 'ntfyTopic', 'ntfyToken', 'tgToken', 'tgChat'].map(k => [k, f[k].value])) })
      toast('Avisos guardados')
      viewSettings()
    } catch (err) { toast(err.message) }
  })
  $('#ntest').addEventListener('click', async () => {
    try { await api('/api/notify/test', { method: 'POST' }); toast('Notificación de prueba enviada') } catch (err) { toast(err.message) }
  })
  $('#logout').addEventListener('click', async () => { await api('/api/logout', { method: 'POST' }); me = null; location.hash = '#/login'; router() })
  $('#lang').addEventListener('change', async e => { await api('/api/settings', { method: 'POST', body: { lang: e.target.value } }); me.lang = e.target.value; toast('Idioma guardado') })
  $('#pw').addEventListener('submit', async e => {
    e.preventDefault()
    try {
      await api('/api/settings', { method: 'POST', body: { oldPassword: e.target.old.value, newPassword: e.target.new.value } })
      e.target.reset(); toast('Contraseña cambiada')
    } catch (err) { toast(err.message) }
  })
}