/* ==========================================================================
   SISTEMA DE DISEÑO
   Color en OKLCH: a diferencia de HSL, la luminosidad es perceptualmente
   uniforme, así que un mismo valor de L se ve igual de claro en cualquier
   matiz. Eso permite construir escalas y garantizar contraste AA sin ir
   comprobando pareja por pareja.

   Los neutros son cálidos (matiz 85) a propósito, no fríos: la app se usa
   para leer textos largos en una segunda lengua y el tono papel cansa menos
   que el gris azulado. El acento sí es frío (258), y ese contraste
   cálido/frío es el que da carácter.

   Los nombres antiguos (--bg, --fg, --accent…) se conservan como alias
   semánticos: el resto del archivo sigue funcionando sin tocarse.
   ========================================================================== */
:root {
  /* Acento — matiz 258, el azul de marca (#2d6cdf ≈ accent-500) */
  --accent-50:  oklch(97% 0.018 258);
  --accent-100: oklch(93% 0.040 258);
  --accent-200: oklch(86% 0.075 258);
  --accent-300: oklch(76% 0.115 258);
  --accent-400: oklch(65% 0.150 258);
  --accent-500: oklch(55% 0.170 258);
  --accent-600: oklch(47% 0.145 258);
  --accent-700: oklch(39% 0.115 258);
  --accent-800: oklch(30% 0.085 258);
  --accent-900: oklch(22% 0.060 258);

  /* Neutros cálidos — matiz 85, croma mínimo */
  --neutral-0:   oklch(100% 0 0);
  --neutral-50:  oklch(98%  0.004 85);
  --neutral-100: oklch(95%  0.005 85);
  --neutral-200: oklch(90%  0.006 85);
  --neutral-300: oklch(82%  0.007 85);
  --neutral-400: oklch(68%  0.008 85);
  --neutral-500: oklch(54%  0.008 85);
  --neutral-600: oklch(44%  0.008 85);
  --neutral-700: oklch(33%  0.007 85);
  --neutral-800: oklch(24%  0.006 85);
  --neutral-900: oklch(17%  0.005 85);
  --neutral-950: oklch(12%  0.005 85);

  /* Retroalimentación. Verde y rojo llevan matices separados >100° para que
     sigan siendo distinguibles en deuteranopía, donde el eje rojo-verde es
     justo el que falla; el brillo distinto es la señal de respaldo. */
  --success: oklch(52% 0.135 150);
  --warning: oklch(58% 0.130 70);
  --danger:  oklch(53% 0.170 27);

  /* ---- Alias semánticos (los que usa el resto del archivo) ---- */
  --bg: var(--neutral-50);
  --fg: var(--neutral-900);
  --muted: var(--neutral-600);
  --accent: var(--accent-500);
  --accent-soft: var(--accent-50);
  --border: var(--neutral-200);
  --card-bg: var(--neutral-0);
  --good: var(--success);
  --bad: var(--danger);
  --warn: var(--warning);
  --ring: var(--accent-500);
  --shadow: 0 1px 2px oklch(0% 0 0 / 0.04), 0 2px 8px oklch(0% 0 0 / 0.06);
  --shadow-lg: 0 4px 12px oklch(0% 0 0 / 0.08), 0 12px 28px oklch(0% 0 0 / 0.10);

  /* ---- Tipografía fluida ----
     clamp() interpola entre 320px y 1200px de ancho, así que no hacen falta
     media queries para el tamaño de letra. */
  --text-xs:   clamp(0.75rem,  0.72rem + 0.15vw, 0.8125rem);
  --text-sm:   clamp(0.875rem, 0.85rem + 0.15vw, 0.9375rem);
  --text-base: clamp(1rem,     0.97rem + 0.16vw, 1.0625rem);
  --text-lg:   clamp(1.125rem, 1.08rem + 0.24vw, 1.25rem);
  --text-xl:   clamp(1.25rem,  1.17rem + 0.40vw, 1.5rem);
  --text-2xl:  clamp(1.5rem,   1.37rem + 0.65vw, 1.875rem);
  --text-3xl:  clamp(1.875rem, 1.65rem + 1.10vw, 2.5rem);

  --leading-tight: 1.2;
  --leading-ui: 1.5;
  --leading-reading: 1.7;   /* textos en L2: interlineado holgado */

  /* ---- Ritmo espacial, escala de 4px ---- */
  --space-1: 0.25rem;  --space-2: 0.5rem;   --space-3: 0.75rem;
  --space-4: 1rem;     --space-5: 1.25rem;  --space-6: 1.5rem;
  --space-8: 2rem;     --space-10: 2.5rem;  --space-12: 3rem;  --space-16: 4rem;

  --radius-sm: 6px;
  --radius-md: 12px;
  --radius-lg: 18px;
  --radius-pill: 9999px;

  /* ---- Movimiento ---- */
  --ease: cubic-bezier(0.4, 0, 0.2, 1);
  --ease-spring: cubic-bezier(0.34, 1.4, 0.64, 1);
  --dur-fast: 140ms;
  --dur: 220ms;
}

@media (prefers-color-scheme: dark) {
  :root {
    --bg: var(--neutral-950);
    --fg: var(--neutral-100);
    --muted: var(--neutral-400);
    /* En oscuro sube el acento a 400: el 500 no llega a 3:1 sobre fondo
       casi negro y los bordes de foco dejarían de cumplir AA. */
    --accent: var(--accent-400);
    --accent-soft: var(--accent-900);
    --border: var(--neutral-800);
    --card-bg: var(--neutral-900);
    --ring: var(--accent-400);
    /* Sobre fondo oscuro los colores saturados vibran; se bajan de croma
       y se suben de luminosidad para que descansen la vista. */
    --good: oklch(72% 0.115 150);
    --bad:  oklch(70% 0.140 27);
    --warn: oklch(78% 0.115 70);
    --shadow: 0 2px 12px oklch(0% 0 0 / 0.5);
    --shadow-lg: 0 12px 32px oklch(0% 0 0 / 0.6);
  }
}
}

* { box-sizing: border-box; margin: 0; padding: 0; }

/* Varias clases del layout fijan display, lo que anularía el atributo
   [hidden]; esto lo restaura para toda la app. */
[hidden] { display: none !important; }

body {
  background: var(--bg);
  color: var(--fg);
  font-family: -apple-system, BlinkMacSystemFont, "Segoe UI", system-ui, sans-serif;
  font-size: var(--text-base);
  line-height: var(--leading-ui);
  min-height: 100vh;
  display: flex;
  flex-direction: column;
}

a { color: var(--accent); text-decoration: none; }
a:hover { text-decoration: underline; }

.appbar {
  display: flex;
  align-items: center;
  gap: 24px;
  padding: 12px 24px;
  background: var(--card-bg);
  border-bottom: 1px solid var(--border);
  position: sticky;
  top: 0;
  z-index: 10;
}

.logo {
  font-weight: 700;
  letter-spacing: 0.04em;
  color: var(--accent);
}

.appbar nav {
  flex: 1;
  display: flex;
  gap: 18px;
  font-size: 14px;
  overflow-x: auto;
  scrollbar-width: thin;
}

.appbar nav a {
  color: var(--muted);
  padding: 6px 10px;
  border-radius: 6px;
}

.appbar nav a.active {
  color: var(--accent);
  background: var(--accent-soft);
}

.level-pill {
  font-size: 13px;
  color: var(--muted);
}

.app-actions {
  display: flex;
  align-items: center;
  gap: 8px;
}

.utility-btn,
.connection-status {
  border: 1px solid var(--border);
  border-radius: 999px;
  background: var(--bg);
  color: var(--muted);
  font: inherit;
  font-size: 12px;
  padding: 5px 9px;
}

.utility-btn {
  cursor: pointer;
  color: var(--accent);
}

.connection-status::before {
  content: "";
  display: inline-block;
  width: 7px;
  height: 7px;
  border-radius: 50%;
  background: var(--good);
  margin-right: 6px;
}

.connection-status.offline::before {
  background: var(--warn);
}

.level-pill select {
  font: inherit;
  font-weight: 600;
  color: var(--fg);
  background: transparent;
  border: 1px solid var(--border);
  border-radius: 4px;
  padding: 3px 6px;
  margin-left: 4px;
}

main {
  flex: 1;
  width: 100%;
  max-width: 1080px;
  margin: 0 auto;
  padding: 32px 20px 60px;
}

.appfooter {
  background: var(--card-bg);
  border-top: 1px solid var(--border);
  padding: 12px 24px;
  font-size: 13px;
  color: var(--muted);
  display: flex;
  justify-content: space-between;
  flex-wrap: wrap;
  gap: 10px;
}

h1 { font-size: 28px; letter-spacing: 0; margin-bottom: 8px; }
h2 { font-size: 22px; margin: 32px 0 14px; }
h3 { font-size: 17px; margin: 20px 0 8px; color: var(--muted); }
p { margin-bottom: 12px; }

.dashboard-top {
  display: flex;
  align-items: flex-start;
  justify-content: space-between;
  gap: 16px;
  margin-bottom: 20px;
}

.dashboard-grid {
  display: grid;
  gap: 16px;
  grid-template-columns: 1fr;
  margin-top: 24px;
}
@media (min-width: 700px) {
  .dashboard-grid { grid-template-columns: 1fr 1fr; }
}

.module-card {
  background: var(--card-bg);
  border: 1px solid var(--border);
  border-radius: 8px;
  padding: 20px 22px;
  box-shadow: var(--shadow);
  text-decoration: none;
  color: var(--fg);
  transition: transform 0.1s, border-color 0.2s;
}
.module-card:hover {
  border-color: var(--accent);
  transform: translateY(-2px);
  text-decoration: none;
}
.module-card h2 { margin: 0 0 6px; font-size: 20px; }
.module-card .desc { font-size: 14px; color: var(--muted); }
.module-card .stat {
  font-size: 12px;
  color: var(--accent);
  margin-top: 12px;
  text-transform: uppercase;
  letter-spacing: 0.04em;
}

.flashcard {
  background: var(--card-bg);
  border: 1px solid var(--border);
  border-radius: 8px;
  padding: 40px 30px;
  box-shadow: var(--shadow);
  margin: 20px 0;
  min-height: 260px;
  display: flex;
  flex-direction: column;
  justify-content: space-between;
  gap: 20px;
}

.flashcard .front {
  font-size: 32px;
  font-weight: 600;
  text-align: center;
  letter-spacing: 0;
}

.flashcard .back {
  text-align: center;
  font-size: 18px;
  line-height: 1.4;
}

.flashcard .example {
  font-style: italic;
  color: var(--muted);
  margin: 12px 0;
}

.flashcard .translation {
  font-size: 14px;
  color: var(--muted);
  border-top: 1px dashed var(--border);
  padding-top: 10px;
}

.flashcard .tags {
  display: flex;
  gap: 6px;
  flex-wrap: wrap;
  font-size: 11px;
}
.flashcard .tag {
  background: var(--accent-soft);
  color: var(--accent);
  padding: 3px 8px;
  border-radius: 4px;
}

.rating-row {
  display: grid;
  grid-template-columns: repeat(4, 1fr);
  gap: 8px;
  margin-top: 20px;
}
.rating-btn {
  font: inherit;
  font-weight: 600;
  padding: 12px 6px;
  border: 1px solid var(--border);
  border-radius: 8px;
  background: var(--card-bg);
  color: var(--fg);
  cursor: pointer;
  font-size: 13px;
  transition: background 0.1s;
}
.rating-btn:hover { background: var(--accent-soft); }
.rating-btn.again { color: var(--bad); }
.rating-btn.hard { color: var(--warn); }
.rating-btn.good { color: var(--accent); }
.rating-btn.easy { color: var(--good); }

.btn {
  font: inherit;
  padding: 10px 16px;
  border: 1px solid var(--border);
  border-radius: 6px;
  background: var(--card-bg);
  color: var(--fg);
  cursor: pointer;
}
.btn-primary { background: var(--accent); color: white; border: none; }
.btn-primary:hover { opacity: 0.9; }

.text-block {
  background: var(--card-bg);
  border: 1px solid var(--border);
  border-radius: 8px;
  padding: 24px 28px;
  font-size: 18px;
  line-height: 1.7;
  margin: 16px 0;
  box-shadow: var(--shadow);
}

.text-block .gloss {
  border-bottom: 2px dotted var(--accent);
  cursor: help;
  position: relative;
}
.text-block .gloss[data-tip]:hover::after {
  content: attr(data-tip);
  position: absolute;
  bottom: 100%;
  left: 50%;
  transform: translateX(-50%);
  background: var(--fg);
  color: var(--bg);
  padding: 4px 10px;
  border-radius: 4px;
  white-space: nowrap;
  font-size: 13px;
  pointer-events: none;
  margin-bottom: 6px;
}

.text-block .collocation {
  background: var(--accent-soft);
  padding: 0 4px;
  border-radius: 3px;
}

.question {
  margin: 20px 0;
  padding: 16px 20px;
  background: var(--card-bg);
  border: 1px solid var(--border);
  border-radius: 8px;
}
.question .q-text { font-weight: 600; margin-bottom: 10px; }
.question .options { display: flex; flex-direction: column; gap: 8px; }
.question .opt {
  padding: 8px 14px;
  border: 1px solid var(--border);
  border-radius: 6px;
  cursor: pointer;
  background: var(--bg);
}
.question .opt:hover { background: var(--accent-soft); }
.question .opt.correct { background: rgba(45,122,63,0.15); border-color: var(--good); }
.question .opt.wrong { background: rgba(183,50,37,0.12); border-color: var(--bad); }

.audio-player {
  width: 100%;
  margin: 12px 0;
}

.script {
  font-family: Georgia, serif;
  line-height: 1.7;
  background: var(--card-bg);
  padding: 18px 22px;
  border-radius: 8px;
  border: 1px solid var(--border);
}
.script.hidden { display: none; }

.progress-bar {
  height: 6px;
  background: var(--border);
  border-radius: 3px;
  overflow: hidden;
  margin: 10px 0;
}
.progress-bar > div {
  height: 100%;
  background: var(--accent);
  transition: width 0.3s;
}

.muted { color: var(--muted); font-size: 14px; }

.empty {
  text-align: center;
  padding: 60px 20px;
  color: var(--muted);
}

.stats-row {
  display: flex;
  gap: 20px;
  margin: 16px 0 24px;
  flex-wrap: wrap;
}
.stat-block {
  background: var(--card-bg);
  border: 1px solid var(--border);
  border-radius: 8px;
  padding: 12px 18px;
  min-width: 100px;
}
.stat-block .label { font-size: 12px; color: var(--muted); text-transform: uppercase; letter-spacing: 0.04em; }
.stat-block .value { font-size: 24px; font-weight: 600; color: var(--accent); }

kbd {
  font-family: ui-monospace, monospace;
  background: var(--border);
  border-radius: 3px;
  padding: 2px 6px;
  font-size: 12px;
}

.section-list {
  list-style: none;
  display: grid;
  gap: 12px;
  margin: 18px 0;
}

.section-card a {
  display: grid;
  grid-template-columns: minmax(82px, auto) 1fr;
  gap: 12px;
  align-items: center;
  color: var(--fg);
  background: var(--card-bg);
  border: 1px solid var(--border);
  border-radius: 8px;
  padding: 14px 16px;
  text-decoration: none;
}

.section-card a:hover {
  border-color: var(--accent);
  text-decoration: none;
}

.section-card .num {
  color: var(--accent);
  font-size: 12px;
  font-weight: 700;
  text-transform: uppercase;
}

.section-card .title {
  font-weight: 700;
}

.section-card .desc {
  grid-column: 2;
  color: var(--muted);
  font-size: 14px;
}

.coach-hero {
  display: grid;
  grid-template-columns: minmax(0, 1.4fr) minmax(280px, 0.8fr);
  gap: 16px;
  margin: 20px 0 28px;
}

.coach-hero.compact {
  margin-top: 16px;
}

.hero-panel,
.tool-panel {
  background: var(--card-bg);
  border: 1px solid var(--border);
  border-radius: 8px;
  padding: 18px;
  box-shadow: var(--shadow);
}

.eyebrow {
  color: var(--muted);
  font-size: 12px;
  font-weight: 700;
  text-transform: uppercase;
  letter-spacing: 0.04em;
  margin-bottom: 12px;
}

.mission-list {
  display: grid;
  gap: 10px;
}

.mission-item {
  display: grid;
  grid-template-columns: 36px 1fr;
  gap: 12px;
  align-items: center;
  color: var(--fg);
  border: 1px solid var(--border);
  border-radius: 8px;
  padding: 12px;
  text-decoration: none;
}

.mission-item:hover {
  border-color: var(--accent);
  background: var(--accent-soft);
  text-decoration: none;
}

.mission-step {
  display: grid;
  place-items: center;
  width: 32px;
  height: 32px;
  border-radius: 50%;
  background: var(--accent);
  color: #fff;
  font-weight: 700;
}

.mission-item small {
  display: block;
  color: var(--muted);
  margin-top: 2px;
}

.progress-panel {
  display: grid;
  justify-items: center;
  gap: 14px;
}

.progress-ring {
  --value: 0;
  position: relative;
  width: 150px;
  aspect-ratio: 1;
  border-radius: 50%;
  display: grid;
  place-items: center;
  background:
    radial-gradient(circle at center, var(--card-bg) 0 58%, transparent 59%),
    conic-gradient(var(--accent) calc(var(--value) * 1%), var(--border) 0);
}

.progress-ring strong {
  font-size: 30px;
  line-height: 1;
}

.progress-ring span {
  color: var(--muted);
  font-size: 12px;
  margin-top: 38px;
  position: absolute;
}

.mini-stats,
.skill-grid,
.analysis-grid {
  display: grid;
  grid-template-columns: repeat(3, minmax(0, 1fr));
  gap: 10px;
  width: 100%;
}

.mini-stats div,
.skill-grid div,
.score-card {
  border: 1px solid var(--border);
  border-radius: 8px;
  padding: 10px;
  text-align: center;
  background: var(--bg);
}

.mini-stats strong,
.skill-grid strong,
.score-card strong {
  display: block;
  color: var(--accent);
  font-size: 22px;
}

.mini-stats span,
.skill-grid span,
.score-card span {
  display: block;
  color: var(--muted);
  font-size: 12px;
}

.tools-grid {
  display: grid;
  grid-template-columns: repeat(2, minmax(0, 1fr));
  gap: 16px;
}

.panel-head {
  display: flex;
  justify-content: space-between;
  gap: 14px;
  align-items: flex-start;
  margin-bottom: 14px;
}

.panel-head h2 {
  margin: 0 0 4px;
}

.compact-field {
  color: var(--muted);
  display: grid;
  gap: 4px;
  font-size: 12px;
  white-space: nowrap;
}

.compact-field input {
  width: 72px;
  border: 1px solid var(--border);
  border-radius: 6px;
  padding: 7px 8px;
  color: var(--fg);
  background: var(--bg);
  font: inherit;
}

.timer-display {
  font: 700 52px ui-monospace, SFMono-Regular, Menlo, monospace;
  text-align: center;
  padding: 18px 0;
}

.button-row {
  display: flex;
  flex-wrap: wrap;
  gap: 8px;
  align-items: center;
}

.btn.danger,
.danger {
  color: var(--bad);
}

.status-line {
  color: var(--muted);
  font-size: 14px;
  margin-top: 12px;
}

.chip-row {
  display: flex;
  flex-wrap: wrap;
  gap: 8px;
  margin: 8px 0 12px;
}

.chip {
  border: 1px solid var(--border);
  border-radius: 999px;
  color: var(--accent);
  background: var(--accent-soft);
  padding: 6px 10px;
  cursor: pointer;
  font: inherit;
  font-size: 13px;
}

.notebook-chip {
  background: rgba(45,122,63,0.12);
  color: var(--good);
}

.coach-textarea {
  width: 100%;
  min-height: 180px;
  resize: vertical;
  border: 1px solid var(--border);
  border-radius: 8px;
  padding: 12px;
  background: var(--bg);
  color: var(--fg);
  font: inherit;
  line-height: 1.5;
  margin-bottom: 12px;
}

.coach-textarea.small {
  min-height: 82px;
}

.analysis-output {
  margin-top: 14px;
}

.analysis-list,
.activity-list {
  list-style: none;
  display: grid;
  gap: 8px;
  margin-top: 10px;
}

.analysis-list li,
.activity-list li {
  display: grid;
  gap: 2px;
  border-left: 3px solid var(--accent);
  padding: 8px 10px;
  background: var(--bg);
  border-radius: 6px;
}

.analysis-list span,
.activity-list small {
  color: var(--muted);
  font-size: 13px;
}

.shadow-prompt {
  border-left: 4px solid var(--accent);
  padding: 12px 14px;
  margin: 10px 0 14px;
  background: var(--bg);
  border-radius: 6px;
  font-size: 18px;
}

.week-bars {
  display: grid;
  grid-template-columns: repeat(7, 1fr);
  gap: 8px;
  align-items: end;
  min-height: 120px;
  margin: 12px 0 16px;
}

.week-day {
  display: grid;
  gap: 6px;
  justify-items: center;
}

.week-bar {
  width: 100%;
  max-width: 34px;
  height: 92px;
  display: flex;
  align-items: end;
  background: var(--border);
  border-radius: 999px;
  overflow: hidden;
}

.week-bar span {
  display: block;
  width: 100%;
  min-height: 4px;
  background: var(--accent);
  border-radius: inherit;
}

.search-panel,
.filter-row {
  display: grid;
  grid-template-columns: minmax(0, 1fr) auto auto;
  gap: 10px;
  margin: 18px 0;
}

.search-panel input,
.search-panel select,
.filter-row input,
.filter-row select,
.stack-form input,
.stack-form textarea {
  width: 100%;
  border: 1px solid var(--border);
  border-radius: 8px;
  background: var(--card-bg);
  color: var(--fg);
  font: inherit;
  padding: 10px 12px;
}

.search-meta {
  display: flex;
  justify-content: space-between;
  gap: 12px;
  color: var(--muted);
  font-size: 13px;
  margin-bottom: 12px;
}

.search-results,
.lexicon-list {
  display: grid;
  gap: 12px;
}

.search-card,
.lexicon-card {
  display: grid;
  grid-template-columns: minmax(0, 1fr) auto;
  gap: 16px;
  align-items: start;
  border: 1px solid var(--border);
  border-radius: 8px;
  background: var(--card-bg);
  padding: 16px;
  box-shadow: var(--shadow);
}

.search-card h2 {
  margin: 8px 0 4px;
}

.tag-row {
  display: flex;
  flex-wrap: wrap;
  gap: 6px;
  margin-top: 8px;
}

.tag {
  display: inline-flex;
  align-items: center;
  min-height: 24px;
  border-radius: 999px;
  background: var(--accent-soft);
  color: var(--accent);
  font-size: 12px;
  padding: 3px 8px;
}

.tag.good {
  background: rgba(45,122,63,0.12);
  color: var(--good);
}

.card-actions {
  display: flex;
  flex-wrap: wrap;
  gap: 8px;
  justify-content: flex-end;
}

.stack-form {
  display: grid;
  gap: 10px;
}

.stack-form label {
  display: grid;
  gap: 5px;
  color: var(--muted);
  font-size: 13px;
}

.stack-form textarea {
  min-height: 74px;
  resize: vertical;
}

.lexicon-title {
  font-size: 20px;
  font-weight: 700;
}

.lexicon-card blockquote,
.quiz-card blockquote {
  border-left: 3px solid var(--accent);
  margin: 10px 0;
  padding: 8px 12px;
  background: var(--bg);
  border-radius: 6px;
}

.quiz-box,
.quiz-card {
  min-height: 210px;
}

.quiz-card {
  display: grid;
  gap: 12px;
  align-content: start;
}

@media (max-width: 840px) {
  .appbar {
    align-items: flex-start;
    flex-wrap: wrap;
    gap: 10px;
    padding: 12px 16px;
  }

  .appbar nav {
    order: 3;
    width: 100%;
    flex: 1 0 100%;
    gap: 8px;
  }

  .app-actions {
    margin-left: auto;
  }

  .appbar nav a {
    white-space: nowrap;
  }

  main {
    padding-top: 24px;
  }

  .dashboard-top,
  .panel-head {
    flex-direction: column;
  }

  .coach-hero,
  .tools-grid,
  .search-card,
  .lexicon-card {
    grid-template-columns: 1fr;
  }

  .card-actions {
    justify-content: flex-start;
  }

  .timer-display {
    font-size: 42px;
  }
}

@media (max-width: 520px) {
  .rating-row,
  .mini-stats,
  .skill-grid,
  .analysis-grid {
    grid-template-columns: 1fr 1fr;
  }

  .section-card a {
    grid-template-columns: 1fr;
  }

  .section-card .desc {
    grid-column: auto;
  }

  .stats-row {
    gap: 10px;
  }

  .stat-block {
    flex: 1 1 140px;
  }

  .search-panel,
  .filter-row {
    grid-template-columns: 1fr;
  }
}

/* ── Tutor IA (chat con streaming) ─────────────────────────────────────── */
.tutor-chat {
  display: flex;
  flex-direction: column;
  gap: 10px;
  max-height: 52vh;
  overflow-y: auto;
  padding: 12px;
  margin-bottom: 12px;
  border: 1px solid var(--border);
  border-radius: 10px;
  background: var(--bg);
}

.tutor-msg {
  max-width: 82%;
  padding: 9px 12px;
  border: 1px solid var(--border);
  border-radius: 12px;
  background: var(--card-bg);
  font-size: 15px;
}

.tutor-msg.from-user {
  align-self: flex-end;
  background: var(--accent-soft);
  border-color: var(--accent-soft);
}

.tutor-msg.from-tutor { align-self: flex-start; }

.tutor-msg .who {
  display: block;
  font-size: 11px;
  text-transform: uppercase;
  letter-spacing: 0.05em;
  color: var(--muted);
  margin-bottom: 3px;
}

.tutor-msg.pending .body { opacity: 0.85; }

#tutor-status.good, #tutor-status.danger { font-weight: 600; }
#tutor-status.good { color: var(--good); }
#tutor-status.danger { color: var(--bad); }

@media (max-width: 520px) {
  .tutor-msg { max-width: 95%; }
  .tutor-chat { max-height: 60vh; }
}

/* ==========================================================================
   ACCESIBILIDAD Y MOVIMIENTO (WCAG 2.2 AA)

   Antes de esto el archivo no definía ni un solo estilo de foco ni respetaba
   la preferencia de movimiento reducido del sistema.
   ========================================================================== */

/* 2.4.11 / 2.4.13 — Apariencia del foco.
   :focus-visible y no :focus para que el anillo salga al navegar con teclado
   pero no al hacer clic con el ratón. Grosor 2px y offset 2px: el offset
   separa el anillo del propio componente, que es lo que garantiza el 3:1
   incluso cuando el elemento tiene el color del acento de fondo. */
:where(a, button, input, select, textarea, summary, [tabindex]):focus-visible {
  outline: 2px solid var(--ring);
  outline-offset: 2px;
  border-radius: var(--radius-sm);
}

/* 2.5.8 — Tamaño mínimo del objetivo táctil: 24×24 px CSS.
   Se aplica solo a controles reales; los enlaces dentro de un párrafo están
   exentos por la propia norma y estirarlos rompería el interlineado. */
button, .btn, .rating-btn, .utility-btn, [role="button"] {
  min-height: 24px;
  min-width: 24px;
}

/* Transiciones coherentes en los elementos interactivos. */
a, button, .btn, .rating-btn, .utility-btn, .module-card {
  transition: background-color var(--dur-fast) var(--ease),
              border-color var(--dur-fast) var(--ease),
              color var(--dur-fast) var(--ease),
              box-shadow var(--dur) var(--ease),
              transform var(--dur) var(--ease);
}

/* Textos largos en segunda lengua: interlineado holgado y medida de línea
   limitada. Más de ~75 caracteres por línea obliga al ojo a buscar el
   siguiente renglón, y eso penaliza más al leer en L2 que en la lengua
   materna. */
.text-block, .script {
  line-height: var(--leading-reading);
  max-width: 68ch;
  text-wrap: pretty;
}

/* Respeta la preferencia del sistema. No se desactiva del todo (eso puede
   romper animaciones que comunican estado) sino que se reduce a un valor
   imperceptible, que es la recomendación habitual. */
@media (prefers-reduced-motion: reduce) {
  *, *::before, *::after {
    animation-duration: 0.01ms !important;
    animation-iteration-count: 1 !important;
    transition-duration: 0.01ms !important;
    scroll-behavior: auto !important;
  }
}