:root {
  --paper: #f6f8fa;
  --grid: #e2e8ee;
  --ink: #22335c;
  --ink-soft: #4a5a7c;
  --pencil: #5b6573;
  --marker: #ffe45c;
  --ok: #2f7d5b;
  --error: #b8412c;
  --card: #ffffff;
  --line: #cfd8e2;
  --font-body: "Atkinson Hyperlegible", "Segoe UI", system-ui, sans-serif;
  --font-head: "Bricolage Grotesque", "Segoe UI", system-ui, sans-serif;
  box-sizing: border-box;
  padding-top: env(safe-area-inset-top, 0px);
  padding-bottom: env(safe-area-inset-bottom, 0px);
}
@media (prefers-color-scheme: dark) {
  :root:not([data-theme="light"]) {
    --paper: #141a24; --grid: #1e2633; --ink: #e6ecf5; --ink-soft: #aab6c9; --pencil: #8e9aac;
    --marker: #8a7414; --ok: #6cc59b; --error: #f08a74; --card: #1b2230; --line: #2e3949;
  }
}
:root[data-theme="dark"] {
  --paper: #141a24; --grid: #1e2633; --ink: #e6ecf5; --ink-soft: #aab6c9; --pencil: #8e9aac;
  --marker: #8a7414; --ok: #6cc59b; --error: #f08a74; --card: #1b2230; --line: #2e3949;
}
*, *::before, *::after { box-sizing: inherit; }
html { height: 100%; }
body {
  margin: 0; min-height: 100%;
  font: 17px/1.55 var(--font-body);
  color: var(--ink);
  background-color: var(--paper);
  /* cuadrícula de cuaderno */
  background-image:
    linear-gradient(var(--grid) 1px, transparent 1px),
    linear-gradient(90deg, var(--grid) 1px, transparent 1px);
  background-size: 24px 24px;
}
button, input, select, textarea { font: inherit; color: inherit; }
:focus-visible { outline: 3px solid var(--ink); outline-offset: 2px; }

/* ---------- barra superior ---------- */
.topbar {
  position: sticky; top: env(safe-area-inset-top, 0px); z-index: 5;
  display: flex; justify-content: space-between; align-items: center;
  padding: .6rem 1rem; background: var(--paper); border-bottom: 2px solid var(--ink);
}
.brand { background: none; border: 0; font: 800 1.15rem var(--font-head); cursor: pointer; padding: 0; }
.stats-mini { display: flex; gap: 1rem; font-weight: 700; }

/* ---------- estructura ---------- */
main { padding: 1.25rem 1rem 2rem; }
.narrow { max-width: 38rem; margin: 0 auto; }
.display { font: 800 clamp(2rem, 7vw, 3.2rem)/1.05 var(--font-head); letter-spacing: -.02em; margin: 1rem 0 .75rem; }
.title { font: 700 1.6rem/1.2 var(--font-head); margin: .5rem 0 1rem; }
.subtitle { font: 700 1.2rem/1.3 var(--font-head); margin: 1.5rem 0 .5rem; }
.lead { font-size: 1.15rem; color: var(--ink-soft); max-width: 32rem; }
.hint, .msg { color: var(--pencil); font-size: .95rem; }
.msg.error { color: var(--error); }
.stack { display: grid; gap: .9rem; }
.row { display: flex; gap: .6rem; flex-wrap: wrap; align-items: center; }
.links { margin-top: 1rem; }
label { display: grid; gap: .3rem; font-weight: 700; }
label.inline { display: flex; gap: .5rem; align-items: center; font-weight: 400; }
input, select, textarea {
  width: 100%; padding: .65rem .75rem; border: 2px solid var(--line); border-radius: 6px; background: var(--card);
}
input[type="checkbox"] { width: 1.25rem; height: 1.25rem; accent-color: var(--ink); }
fieldset { border: 2px solid var(--line); border-radius: 8px; padding: 1rem; display: grid; gap: .8rem; background: var(--card); }
legend { font: 700 1rem var(--font-head); padding: 0 .4rem; }

/* ---------- botones ---------- */
.btn {
  border: 2px solid var(--ink); background: var(--card); color: var(--ink);
  padding: .6rem 1.1rem; border-radius: 6px; font-weight: 700; cursor: pointer;
}
.btn.primary { background: var(--ink); color: var(--paper); }
.btn.big { width: 100%; padding: 1rem; font-size: 1.1rem; margin-top: 1.25rem; }
.btn.ghost { border-color: transparent; background: transparent; text-decoration: underline; text-underline-offset: 3px; }
.btn.small { padding: .35rem .7rem; font-size: .9rem; }
.btn.danger { border-color: var(--error); color: var(--error); }
.btn.icon { padding: .5rem .65rem; }
.btn[disabled] { opacity: .45; cursor: not-allowed; }
.btn[aria-pressed="true"] { background: var(--marker); }

/* ---------- panel de inicio ---------- */
.dash { display: grid; grid-template-columns: repeat(2, 1fr); gap: .75rem; margin: 1.5rem 0 0; }
.dash div { background: var(--card); border: 2px solid var(--line); border-radius: 8px; padding: .8rem 1rem; }
.dash dt { color: var(--pencil); font-size: .9rem; }
.dash dd { margin: 0; font: 800 1.7rem var(--font-head); }

.pending { margin-top: 1rem; border-left: 6px solid var(--marker); background: var(--card); padding: .8rem 1rem; border-radius: 0 8px 8px 0; }
.pending p { margin: 0 0 .6rem; }

/* ---------- preparación ---------- */
.checklist { list-style: none; padding: 0; display: grid; gap: .5rem; }
.checklist li { background: var(--card); border: 2px solid var(--line); border-radius: 8px; padding: .75rem 1rem; }
.checklist label { display: flex; gap: .75rem; align-items: center; font-weight: 400; cursor: pointer; }
.tip { border-left: 6px solid var(--marker); background: var(--card); padding: .9rem 1.1rem; margin-top: 1.25rem; border-radius: 0 8px 8px 0; }
.tip-text { font-weight: 700; margin: 0 0 .35rem; }
.tip-science { margin: 0; color: var(--ink-soft); font-size: .95rem; }

/* ---------- clase ---------- */
.class-view { max-width: 46rem; margin: 0 auto; display: flex; flex-direction: column; }
.class-head { display: flex; justify-content: space-between; align-items: center; gap: .5rem; flex-wrap: wrap; }
/* La cabecera de la clase (Lento / Terminar clase) queda fija bajo la barra superior */
#view-class .class-head { position: sticky; top: var(--topbar-h, 60px); z-index: 3; background: var(--paper); padding: .5rem 0; margin-bottom: .5rem; border-bottom: 1px solid var(--line); }
#view-class .class-head .title { margin: 0; }
.finish-btn { display: block; width: 100%; margin-top: .75rem; padding: .85rem 1rem; font-size: 1.05rem; }
.chat { display: flex; flex-direction: column; gap: .9rem; padding-bottom: calc(var(--composer-h, 10rem) + 1rem); }
.bubble { max-width: 92%; padding: .8rem 1rem; border-radius: 10px; border: 2px solid var(--line); background: var(--card); overflow-wrap: anywhere; }
.bubble.user { align-self: flex-end; background: var(--ink); color: var(--paper); border-color: var(--ink); }
.bubble.assistant { align-self: flex-start; }
.bubble p { margin: .35rem 0; }
.bubble h4 { font: 700 1.05rem var(--font-head); margin: .6rem 0 .3rem; }
.bubble ul { margin: .3rem 0; padding-left: 1.2rem; }
/* rotulador sobre el vocabulario: el elemento distintivo */
.bubble strong, .hl {
  font-weight: 700;
  background: linear-gradient(transparent 55%, var(--marker) 55%, var(--marker) 92%, transparent 92%);
  padding: 0 .1em;
}
.bubble.user strong { background: none; }
/* Frases en inglés marcadas por el tutor: se tocan para escucharlas */
button.en {
  font: inherit; font-weight: 700; color: inherit; background: none; border: 0; padding: 0 .1em; cursor: pointer;
  text-decoration: underline dotted; text-underline-offset: 3px; text-align: left;
}
button.en::after { content: " 🔊"; font-size: .8em; }
button.en:hover { background: var(--marker); color: #22335c; }
.bubble .audio { display: flex; gap: .4rem; margin-top: .5rem; }
.bubble.typing { color: var(--pencil); font-style: italic; }

.composer {
  position: fixed; left: 0; right: 0; bottom: 0; z-index: 4;
  background: var(--paper); border-top: 2px solid var(--ink);
  padding: .6rem 1rem calc(.6rem + env(safe-area-inset-bottom, 0px));
}
.composer > * { max-width: 46rem; margin-left: auto; margin-right: auto; }
.chips { display: flex; gap: .4rem; overflow-x: auto; padding-bottom: .5rem; }
.chip { flex: none; border: 2px solid var(--line); background: var(--card); border-radius: 999px; padding: .25rem .75rem; font-size: .9rem; cursor: pointer; }
.chip.scenario { border-color: var(--ink); font-weight: 700; }
.chip-sep { flex: none; width: 2px; margin: .15rem .2rem; background: var(--line); border-radius: 2px; }
.compose-row { display: flex; gap: .5rem; align-items: flex-end; }
.compose-row textarea { resize: none; max-height: 8rem; font-size: 16px; } /* 16px evita el zoom automático de iPhone */
#btn-send .ico { display: none; }
.voice-play { margin-top: .5rem; background: transparent; color: inherit; border-color: currentColor; }
.voice-play:disabled { opacity: .6; cursor: default; }
.talk-btn { display: block; width: 100%; margin-top: .75rem; padding: .85rem 1rem; font-size: 1.05rem; text-align: center; }
.btn.recording { background: var(--error); color: #fff; border-color: var(--error); }

/* ---------- resumen ---------- */
.summary-block { background: var(--card); border: 2px solid var(--line); border-radius: 8px; padding: 1rem 1.1rem; margin: 1rem 0; }
.summary-block h3 { font: 700 1.15rem var(--font-head); margin: 0 0 .5rem; }
.xp-earned { font: 800 2.6rem var(--font-head); margin: .25rem 0; }
.cards { display: grid; grid-template-columns: repeat(auto-fill, minmax(9rem, 1fr)); gap: .6rem; }
.flash { min-height: 5.5rem; border: 2px solid var(--ink); border-radius: 8px; background: var(--card); padding: .7rem; cursor: pointer; font-weight: 700; text-align: center; }
.flash.flipped { background: var(--marker); color: #22335c; }
.vocab-table { width: 100%; border-collapse: collapse; }
.table-wrap { overflow-x: auto; }
.vocab-table th, .vocab-table td { text-align: left; padding: .45rem .5rem; border-bottom: 1px solid var(--line); vertical-align: top; }
.tag { font-size: .8rem; border: 1.5px solid currentColor; border-radius: 999px; padding: 0 .5rem; white-space: nowrap; }
.tag.mastered { color: var(--ok); }
.tag.under_review { color: var(--pencil); }
.prompt-list { list-style: none; padding: 0; display: grid; gap: .5rem; }
.prompt-list li { background: var(--card); border: 2px solid var(--line); border-radius: 8px; padding: .6rem .8rem; display: flex; gap: .6rem; align-items: center; }
.prompt-list li.off { opacity: .55; }
.prompt-list li span { flex: 1; }

.loading { position: fixed; inset: 0; display: grid; place-items: center; background: color-mix(in srgb, var(--paper) 70%, transparent); z-index: 10; }
.loading span { width: 2.5rem; height: 2.5rem; border: 4px solid var(--line); border-top-color: var(--ink); border-radius: 50%; animation: spin .8s linear infinite; }
@keyframes spin { to { transform: rotate(360deg); } }
/* ---------- Móvil: aprovechar todo el ancho y dejar visible la barra de escritura ---------- */
@media (max-width: 640px) {
  body { font-size: 16px; background-size: 20px 20px; }
  main { padding: .6rem .35rem 1rem; }
  .topbar { padding: .45rem .6rem; }
  .brand { font-size: 1.05rem; }
  .stats-mini { gap: .55rem; font-size: .92rem; }
  .stats-mini .btn.small { padding: .2rem .45rem; }
  .lbl { display: none; }
  #btn-send .ico { display: inline; }
  .class-head { gap: .3rem; padding: 0 .25rem; }
  .class-head .title { font-size: 1.2rem; margin: .2rem 0 .4rem; }
  .class-head .btn.small { padding: .25rem .55rem; font-size: .85rem; }
  .chat { gap: .55rem; }
  .bubble { max-width: 100%; padding: .6rem .7rem; border-radius: 8px; border-width: 1.5px; line-height: 1.5; }
  .bubble.user { max-width: 88%; }
  .bubble p { margin: .25rem 0; }
  .bubble ul { padding-left: 1rem; }
  .composer { padding: .35rem .35rem calc(.35rem + env(safe-area-inset-bottom, 0px)); border-top-width: 1.5px; }
  .chips { gap: .3rem; padding-bottom: .35rem; }
  .chip { font-size: .82rem; padding: .2rem .6rem; border-width: 1.5px; }
  .compose-row { gap: .3rem; align-items: stretch; }
  .compose-row textarea { padding: .5rem .6rem; min-height: 2.6rem; }
  .compose-row .btn { padding: .4rem .7rem; }
  .talk-btn { font-size: 1rem; padding: .75rem .6rem; }
  .summary-block { padding: .8rem .75rem; margin: .7rem 0; }
  .dash { gap: .5rem; }
  .dash dd { font-size: 1.4rem; }
}

/* ---------- Ajuste a cualquier ancho de pantalla ---------- */
/* Ningún elemento puede ensanchar la página ni desplazarla hacia los lados */
body { overflow-x: hidden; }
main, .view, .chat, .composer, .topbar { max-width: 100%; min-width: 0; }
.narrow, .wide, .class-view { min-width: 0; }
/* La clase y la barra de escritura comparten el mismo ancho (centrado) */
.class-view { width: 100%; max-width: min(60rem, 100%); }
.composer > * { max-width: min(60rem, 100%); }
/* La caja de texto se encoge para que los botones quepan siempre */
.compose-row textarea { flex: 1 1 auto; width: auto; min-width: 0; }
.compose-row .btn { flex: none; }
/* Las palabras largas se parten en lugar de salirse (también en iPhone antiguos) */
.bubble { min-width: 0; overflow-wrap: break-word; word-break: break-word; }
.bubble img, .bubble table, .bubble pre { max-width: 100%; }
.bubble pre { overflow-x: auto; }
/* Barra de accesos: se desliza con el dedo sin mostrar barra de desplazamiento */
.chips { -webkit-overflow-scrolling: touch; scrollbar-width: none; }
.chips::-webkit-scrollbar { display: none; }
/* Márgenes seguros en móviles con notch o en horizontal */
.topbar, .composer { padding-left: max(.6rem, env(safe-area-inset-left, 0px)); padding-right: max(.6rem, env(safe-area-inset-right, 0px)); }
.topbar { gap: .5rem; }
.stats-mini { flex: none; }
/* Móviles pequeños (iPhone SE y similares) */
@media (max-width: 380px) {
  body { font-size: 15px; }
  .brand { font-size: .95rem; }
  .stats-mini { gap: .35rem; font-size: .85rem; }
  .chip { font-size: .78rem; padding: .18rem .5rem; }
}

/* PC y tabletas: todos los comandos visibles a la vez, en varias líneas si hace falta */
@media (min-width: 641px) {
  .chips { flex-wrap: wrap; overflow-x: visible; }
}

@media (prefers-reduced-motion: reduce) { .loading span { animation-duration: 3s; } }
.history-list { list-style: none; padding: 0; display: grid; gap: .5rem; }
.history-item { width: 100%; display: flex; justify-content: space-between; align-items: center; gap: .5rem; text-align: left;
  background: var(--card); border: 2px solid var(--line); border-radius: 8px; padding: .8rem 1rem; cursor: pointer; }
.history-item:hover { border-color: var(--ink); }
.history-row { display: grid; gap: .4rem; }
.history-actions { display: flex; gap: .4rem; justify-content: flex-end; }
.past-chat { padding-bottom: 0; }
.stats-mini { align-items: center; }
.dialog { width: min(34rem, calc(100vw - 2rem)); border: 2px solid var(--ink); border-radius: 10px; background: var(--paper); color: var(--ink); padding: 1.25rem; }
.dialog::backdrop { background: rgba(10, 15, 25, .55); }
.stars { background: var(--card); }
.star-row { display: flex; gap: .5rem; }
.star-row label { display: block; cursor: pointer; }
.star-row input { position: absolute; opacity: 0; width: 1px; height: 1px; }
.star-row span { display: grid; place-items: center; width: 2.6rem; height: 2.6rem; border: 2px solid var(--line); border-radius: 8px; font-weight: 700; background: var(--card); }
.star-row input:checked + span { background: var(--marker); border-color: var(--ink); color: #22335c; }
.star-row input:focus-visible + span { outline: 3px solid var(--ink); outline-offset: 2px; }
.wide { max-width: 72rem; margin: 0 auto; }
.admin-dash { grid-template-columns: repeat(auto-fit, minmax(10rem, 1fr)); margin-bottom: 1rem; }
.admin-table { font-size: .92rem; min-width: 40rem; }
.admin-table td, .admin-table th { white-space: nowrap; }
.admin-table td:first-child { white-space: normal; }
.bar-cell { width: 30%; }
.bar { display: block; height: .7rem; border-radius: 4px; background: var(--ink); }
.fb-list { display: grid; gap: .75rem; }
.fb-item { border: 2px solid var(--line); border-radius: 8px; padding: .8rem 1rem; background: var(--paper); }
.fb-head { display: flex; flex-wrap: wrap; gap: .6rem; align-items: center; }
.fb-rating { color: #d4a017; letter-spacing: .05em; }
.fb-text { white-space: pre-wrap; margin: .5rem 0; }
/* ---------- Planes de pago ---------- */
.plan-line { margin: 1rem 0 0; padding: .6rem .9rem; border: 2px solid var(--line); border-radius: 8px; background: var(--card); }
.plans { display: grid; grid-template-columns: repeat(auto-fit, minmax(15rem, 1fr)); gap: 1rem; margin: 1.25rem 0; }
.plan-card { position: relative; border: 2px solid var(--line); border-radius: 10px; background: var(--card); padding: 1.25rem; display: flex; flex-direction: column; }
.plan-card.featured { border-color: var(--ink); box-shadow: 0 0 0 3px var(--marker); }
.plan-card h3 { font: 700 1.3rem var(--font-head); margin: 0; }
.plan-price { font: 800 2.2rem var(--font-head); margin: .4rem 0 0; }
.plan-price span { font-size: 1rem; font-weight: 700; color: var(--pencil); }
.plan-eq { margin: .2rem 0 0; color: var(--pencil); }
.plan-card ul { padding-left: 1.2rem; flex: 1; }
.plan-badge { position: absolute; top: -.8rem; right: 1rem; margin: 0; background: var(--marker); color: #22335c; font-weight: 700; padding: .15rem .6rem; border-radius: 999px; font-size: .85rem; }
/* ---------- Acceso ---------- */
.social-login { margin-top: 1.25rem; }
.btn.social { margin-top: 0; background: var(--card); }
.divider { display: flex; align-items: center; gap: .75rem; color: var(--pencil); margin: 1.25rem 0 .75rem; }
.divider::before, .divider::after { content: ""; flex: 1; border-top: 1px solid var(--line); }
.help-links { margin-top: .75rem; }
.help-box { margin-top: 1rem; background: var(--card); border: 2px solid var(--line); border-radius: 8px; padding: 1rem; }
.help-box ul { padding-left: 1.2rem; }
.setup-banner p { margin: .35rem 0; }
/* Recuadro del plan: pulsable hacia las formas de pago */
.plan-link { display: flex; flex-wrap: wrap; align-items: center; justify-content: space-between; gap: .6rem; width: 100%; text-align: left; font: inherit; color: inherit; background: none; border: 0; padding: 0; cursor: pointer; }
.pay-badge { display: inline-flex; align-items: center; gap: .4rem; font-size: .9rem; font-weight: 700; border: 2px solid var(--line); border-radius: 6px; padding: .25rem .55rem; background: var(--paper); white-space: nowrap; }
.pay-badge img { height: 22px; width: auto; display: block; }
.plan-link:hover .pay-badge { border-color: var(--ink); }
/* ---------- Nivel de inglés ---------- */
.level-info { background: var(--paper); border-left: 5px solid var(--marker); border-radius: 0 8px 8px 0; padding: .6rem .8rem; }
.level-info p { margin: .2rem 0; }
.level-info ul { margin: .3rem 0 0; padding-left: 1.2rem; }
.level-help { display: flex; flex-wrap: wrap; gap: .5rem; align-items: center; }
.level-help .hint { margin: 0; flex: 1 1 16rem; }
.level-dialog { width: min(40rem, calc(100vw - 1.5rem)); max-height: calc(100vh - 2rem); }
.lt-q { border: 2px solid var(--line); border-radius: 8px; padding: .7rem .9rem; margin: 0 0 .7rem; background: var(--card); }
.lt-q legend { font: 700 .95rem var(--font-body); padding: 0 .3rem; }
.lt-q .lt-en { font-weight: 700; }
.lt-opts { display: flex; flex-wrap: wrap; gap: .4rem; margin-top: .4rem; }
.lt-opts label { display: inline-flex; align-items: center; gap: .35rem; font-weight: 400; border: 2px solid var(--line); border-radius: 999px; padding: .2rem .7rem; cursor: pointer; }
.lt-opts input { width: 1rem; height: 1rem; }
.lt-opts label:has(input:checked) { border-color: var(--ink); background: var(--marker); color: #22335c; }
.lt-q.missing { border-color: var(--error); }
.lt-result { border: 2px solid var(--ink); border-radius: 8px; padding: .8rem 1rem; background: var(--card); }
.lt-result h3 { margin: 0 0 .3rem; font: 800 1.3rem var(--font-head); }
/* ---------- Ventanas de mensaje propias ---------- */
.ui-dialog { width: min(28rem, calc(100vw - 2rem)); }
.ui-dialog .title { font-size: 1.3rem; margin: 0; }
.ui-dialog #ui-body p { margin: 0 0 .5rem; }
.ui-actions { justify-content: flex-end; }
.ui-dialog.danger #ui-ok { background: var(--error); border-color: var(--error); color: #fff; }
.ui-dialog.danger { border-color: var(--error); }
/* ---------- Legal, cuenta y app ---------- */
.legal-links { margin-top: 1.5rem; font-size: .9rem; color: var(--pencil); text-align: center; }
.legal-links a { color: inherit; }
.danger-zone { border-color: var(--error); }
.danger-zone h3 { color: var(--error); }
#reminder-time { width: auto; }
/* En la app: respetar la zona segura del móvil (muesca y barra inferior) */
html.native body { padding-top: env(safe-area-inset-top, 0px); padding-bottom: env(safe-area-inset-bottom, 0px); }
[hidden] { display: none !important; }
/* Páginas legales */
main.legal { padding: 1.5rem 1rem 3rem; line-height: 1.6; }
main.legal h2 { font: 700 1.15rem var(--font-head); margin-top: 1.6rem; }