/* ==========================================================================
   odisea.deft.work — Diseño Editorial Libro Interactivo (Motor HOMERO)
   Iniciativa Ciudadana Europea ECI(2026)000012 — Denominación de Origen .ia
   ========================================================================== */

:root {
  /* Paleta Editorial (Modo Claro: papel cálido / Modo Oscuro: tinta nocturna) */
  --bg-page-light: #faf7f2;
  --bg-page-dark: #111318;

  --bg-surface-light: #ffffff;
  --bg-surface-dark: #1a1d24;

  --bg-subtle-light: #f1ece1;
  --bg-subtle-dark: #222631;

  --text-main-light: #1c1e21;
  --text-main-dark: #e8e6e1;

  --text-muted-light: #5c5f66;
  --text-muted-dark: #9ea3b0;

  --brand-primary-light: #003399;
  --brand-primary-dark: #7aa2f7;

  --brand-gold-light: #9a6b00;
  --brand-gold-dark: #ffcc00;

  --border-color-light: #e2dacb;
  --border-color-dark: #2e3340;

  --karaoke-sent-light: #fff6d6;
  --karaoke-sent-dark: #282a1e;

  --karaoke-word-light: #ffe082;
  --karaoke-word-dark: #5c4b12;

  --error-color-light: #d93025;
  --error-color-dark: #f28b82;
  --error-bg-light: #fce8e6;
  --error-bg-dark: #3c1f1e;

  --valid-color-light: #188038;
  --valid-color-dark: #81c995;

  /* Fallbacks para navegadores sin soporte light-dark() */
  --bg-page: var(--bg-page-light);
  --bg-surface: var(--bg-surface-light);
  --bg-subtle: var(--bg-subtle-light);
  --text-main: var(--text-main-light);
  --text-muted: var(--text-muted-light);
  --brand-primary: var(--brand-primary-light);
  --brand-gold: var(--brand-gold-light);
  --border-color: var(--border-color-light);
  --karaoke-sent: var(--karaoke-sent-light);
  --karaoke-word: var(--karaoke-word-light);
  --error-color: var(--error-color-light);
  --error-bg: var(--error-bg-light);
  --valid-color: var(--valid-color-light);

  @media (prefers-color-scheme: dark) {
    --bg-page: var(--bg-page-dark);
    --bg-surface: var(--bg-surface-dark);
    --bg-subtle: var(--bg-subtle-dark);
    --text-main: var(--text-main-dark);
    --text-muted: var(--text-muted-dark);
    --brand-primary: var(--brand-primary-dark);
    --brand-gold: var(--brand-gold-dark);
    --border-color: var(--border-color-dark);
    --karaoke-sent: var(--karaoke-sent-dark);
    --karaoke-word: var(--karaoke-word-dark);
    --error-color: var(--error-color-dark);
    --error-bg: var(--error-bg-dark);
    --valid-color: var(--valid-color-dark);
  }

  /* Declaración base obligatoria para adaptación nativa de UI */
  color-scheme: light dark;

  &:has(> head > meta[name="color-scheme"][content="dark"]) {
    color-scheme: dark;
    --bg-page: var(--bg-page-dark);
    --bg-surface: var(--bg-surface-dark);
    --bg-subtle: var(--bg-subtle-dark);
    --text-main: var(--text-main-dark);
    --text-muted: var(--text-muted-dark);
    --brand-primary: var(--brand-primary-dark);
    --brand-gold: var(--brand-gold-dark);
    --border-color: var(--border-color-dark);
    --karaoke-sent: var(--karaoke-sent-dark);
    --karaoke-word: var(--karaoke-word-dark);
    --error-color: var(--error-color-dark);
    --error-bg: var(--error-bg-dark);
    --valid-color: var(--valid-color-dark);
  }

  &:has(> head > meta[name="color-scheme"][content="light"]) {
    color-scheme: light;
    --bg-page: var(--bg-page-light);
    --bg-surface: var(--bg-surface-light);
    --bg-subtle: var(--bg-subtle-light);
    --text-main: var(--text-main-light);
    --text-muted: var(--text-muted-light);
    --brand-primary: var(--brand-primary-light);
    --brand-gold: var(--brand-gold-light);
    --border-color: var(--border-color-light);
    --karaoke-sent: var(--karaoke-sent-light);
    --karaoke-word: var(--karaoke-word-light);
    --error-color: var(--error-color-light);
    --error-bg: var(--error-bg-light);
    --valid-color: var(--valid-color-light);
  }

  @supports (color: light-dark(white, black)) {
    --bg-page: light-dark(var(--bg-page-light), var(--bg-page-dark));
    --bg-surface: light-dark(var(--bg-surface-light), var(--bg-surface-dark));
    --bg-subtle: light-dark(var(--bg-subtle-light), var(--bg-subtle-dark));
    --text-main: light-dark(var(--text-main-light), var(--text-main-dark));
    --text-muted: light-dark(var(--text-muted-light), var(--text-muted-dark));
    --brand-primary: light-dark(var(--brand-primary-light), var(--brand-primary-dark));
    --brand-gold: light-dark(var(--brand-gold-light), var(--brand-gold-dark));
    --border-color: light-dark(var(--border-color-light), var(--border-color-dark));
    --karaoke-sent: light-dark(var(--karaoke-sent-light), var(--karaoke-sent-dark));
    --karaoke-word: light-dark(var(--karaoke-word-light), var(--karaoke-word-dark));
    --error-color: light-dark(var(--error-color-light), var(--error-color-dark));
    --error-bg: light-dark(var(--error-bg-light), var(--error-bg-dark));
    --valid-color: light-dark(var(--valid-color-light), var(--valid-color-dark));
  }

  accent-color: var(--brand-primary);
  --font-serif: "Charter", "Iowan Old Style", "Palatino Linotype", "Book Antiqua", Georgia, serif;
  --font-sans: system-ui, -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, sans-serif;
}

*, *::before, *::after {
  box-sizing: border-box;
}

body {
  margin: 0;
  background-color: var(--bg-page);
  color: var(--text-main);
  font-family: var(--font-serif);
  font-size: clamp(1.08rem, 1.02rem + 0.3vw, 1.25rem);
  line-height: 1.75;
  -webkit-font-smoothing: antialiased;
  accent-color: var(--brand-primary);
}

/* ==========================================================================
   Barra de progreso de lectura (Scroll-driven animation + fallback)
   ========================================================================== */
#progress {
  position: fixed;
  top: 0;
  left: 0;
  z-index: 1000;
  width: 100%;
  height: 4px;
  background: linear-gradient(90deg, var(--brand-primary), var(--brand-gold));
  transform-origin: 0 50%;
  transform: scaleX(0);
}

@media (prefers-reduced-motion: no-preference) {
  @supports (animation-timeline: scroll()) {
    @keyframes grow-progress {
      from { transform: scaleX(0); }
      to { transform: scaleX(1); }
    }

    #progress {
      animation: grow-progress auto linear;
      animation-timeline: scroll(root block);
    }
  }
}

/* ==========================================================================
   Cabecera Editorial y Controles (Idioma / Tema / Descargas)
   ========================================================================== */
.top-bar {
  position: sticky;
  top: 0;
  z-index: 900;
  background-color: var(--bg-page);
  border-bottom: 1px solid var(--border-color);
  padding: 0.65rem 1.25rem;
  font-family: var(--font-sans);
}

.top-bar-inner {
  max-width: 1120px;
  margin: 0 auto;
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 1rem;
  flex-wrap: wrap;
}

.book-brand {
  display: flex;
  align-items: baseline;
  gap: 0.6rem;
  text-decoration: none;
  color: var(--text-main);
}

.book-brand-badge {
  background-color: var(--brand-primary);
  color: #ffffff;
  font-weight: 700;
  font-size: 0.78rem;
  padding: 0.15rem 0.5rem;
  border-radius: 4px;
  letter-spacing: 0.04em;
}

.book-brand-title {
  font-weight: 700;
  font-size: 0.98rem;
  letter-spacing: -0.01em;
}

.controls-group {
  display: flex;
  align-items: center;
  gap: 0.55rem;
  flex-wrap: wrap;
}

.lang-select,
.theme-btn,
.format-pill {
  font-family: var(--font-sans);
  font-size: 0.82rem;
  background-color: var(--bg-surface);
  color: var(--text-main);
  border: 1px solid var(--border-color);
  border-radius: 6px;
  padding: 0.36rem 0.65rem;
  cursor: pointer;
  text-decoration: none;
  display: inline-flex;
  align-items: center;
  gap: 0.3rem;
}

.format-pill:hover {
  border-color: var(--brand-primary);
  color: var(--brand-primary);
}

.lang-select:focus-visible,
.theme-btn:focus-visible,
.format-pill:focus-visible {
  outline: 2px solid var(--brand-primary);
  outline-offset: 2px;
}

/* ==========================================================================
   Disposición de Libro + Índice Lateral de Capítulos
   ========================================================================== */
.book-layout {
  max-width: 1120px;
  margin: 0 auto;
  padding: 2.25rem 1.25rem 8.5rem;
  display: grid;
  grid-template-columns: 280px minmax(0, 720px);
  gap: 3rem;
  align-items: start;
}

@media (max-width: 920px) {
  .book-layout {
    grid-template-columns: 1fr;
    gap: 2rem;
    padding-top: 1.5rem;
  }
}

.chapter-sidebar {
  position: sticky;
  top: 4.5rem;
  background-color: var(--bg-surface);
  border: 1px solid var(--border-color);
  border-radius: 10px;
  padding: 1.2rem;
  font-family: var(--font-sans);
}

@media (max-width: 920px) {
  .chapter-sidebar {
    position: static;
    order: 2;
  }
}

.sidebar-heading {
  margin: 0 0 0.35rem;
  font-size: 0.76rem;
  text-transform: uppercase;
  letter-spacing: 0.08em;
  color: var(--text-muted);
  font-weight: 700;
}

.sidebar-subtitle {
  margin: 0 0 1rem;
  font-size: 0.82rem;
  color: var(--text-muted);
  line-height: 1.45;
}

.chapter-list {
  list-style: none;
  padding: 0;
  margin: 0 0 1.25rem;
  display: flex;
  flex-direction: column;
  gap: 0.4rem;
}

.chapter-item {
  font-size: 0.84rem;
  line-height: 1.35;
  padding: 0.45rem 0.6rem;
  border-radius: 6px;
  border: 1px solid transparent;
}

.chapter-item.is-active {
  background-color: var(--bg-subtle);
  border-color: var(--border-color);
  font-weight: 600;
  color: var(--brand-primary);
}

.chapter-item.is-upcoming {
  color: var(--text-muted);
  opacity: 0.82;
}

.chapter-num {
  display: block;
  font-size: 0.7rem;
  text-transform: uppercase;
  letter-spacing: 0.06em;
  color: var(--brand-gold);
  font-weight: 700;
}

.sidebar-downloads {
  border-top: 1px solid var(--border-color);
  padding-top: 0.9rem;
  display: flex;
  flex-direction: column;
  gap: 0.45rem;
}

/* ==========================================================================
   Reproductor de Audiolibro Flotante + Karaoke a la inversa (Read-Along)
   ========================================================================== */
.audiobook-player {
  position: fixed;
  bottom: 1.25rem;
  left: 50%;
  transform: translateX(-50%);
  width: min(calc(100% - 2rem), 840px);
  z-index: 950;
  background-color: var(--bg-surface);
  border: 1px solid var(--border-color);
  border-radius: 14px;
  padding: 0.8rem 1.25rem;
  box-shadow: 0 12px 36px rgba(0, 0, 0, 0.16), 0 3px 10px rgba(0, 0, 0, 0.08);
  backdrop-filter: blur(14px);
  -webkit-backdrop-filter: blur(14px);
  font-family: var(--font-sans);
}

@media (max-width: 680px) {
  .audiobook-player {
    bottom: 0.75rem;
    width: calc(100% - 1.2rem);
    padding: 0.65rem 0.95rem;
    border-radius: 12px;
  }
  .audiobook-hint {
    display: none;
  }
}

.audiobook-header {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 0.75rem;
  flex-wrap: wrap;
  margin-bottom: 0.65rem;
}

.audiobook-badge {
  display: inline-flex;
  align-items: center;
  gap: 0.4rem;
  font-size: 0.8rem;
  font-weight: 700;
  color: var(--brand-primary);
}

.audiobook-hint {
  font-size: 0.76rem;
  color: var(--text-muted);
}

.audiobook-controls {
  display: flex;
  align-items: center;
  gap: 0.75rem;
  flex-wrap: wrap;
}

.play-btn {
  background-color: var(--brand-primary);
  color: #ffffff;
  border: none;
  border-radius: 999px;
  padding: 0.48rem 1rem;
  font-size: 0.85rem;
  font-weight: 700;
  cursor: pointer;
  display: inline-flex;
  align-items: center;
  gap: 0.4rem;
}

.play-btn:hover {
  opacity: 0.92;
}

.seek-wrap {
  flex: 1;
  min-width: 160px;
  display: flex;
  align-items: center;
  gap: 0.55rem;
}

.time-label {
  font-size: 0.76rem;
  font-variant-numeric: tabular-nums;
  color: var(--text-muted);
  min-width: 38px;
}

.seek-slider {
  flex: 1;
  cursor: pointer;
}

/* Fallback para navegadores antiguos sin soporte de accent-color (brand-consistent-forms) */
@supports not (accent-color: var(--brand-primary)) {
  input[type="range"].seek-slider {
    -webkit-appearance: none;
    appearance: none;
    background: transparent;
  }

  input[type="range"].seek-slider::-webkit-slider-runnable-track {
    width: 100%;
    height: 8px;
    background: linear-gradient(to right, var(--brand-primary) var(--progress, 0%), #ccc var(--progress, 0%));
    border-radius: 4px;
  }

  input[type="range"].seek-slider::-webkit-slider-thumb {
    -webkit-appearance: none;
    appearance: none;
    height: 16px;
    width: 16px;
    border-radius: 50%;
    background: var(--brand-primary);
    cursor: pointer;
    margin-top: -4px;
  }

  input[type="range"].seek-slider::-moz-range-track {
    width: 100%;
    height: 8px;
    background: #ccc;
    border-radius: 4px;
  }

  input[type="range"].seek-slider::-moz-range-thumb {
    height: 16px;
    width: 16px;
    border-radius: 50%;
    background: var(--brand-primary);
    cursor: pointer;
  }

  input[type="range"].seek-slider::-moz-range-progress {
    background-color: var(--brand-primary);
    height: 8px;
    border-radius: 4px;
  }
}

.speed-select {
  font-family: var(--font-sans);
  font-size: 0.78rem;
  background-color: var(--bg-surface);
  color: var(--text-main);
  border: 1px solid var(--border-color);
  border-radius: 6px;
  padding: 0.3rem 0.45rem;
}

.autoscroll-label {
  display: inline-flex;
  align-items: center;
  gap: 0.3rem;
  font-size: 0.78rem;
  color: var(--text-muted);
  cursor: pointer;
}

/* ==========================================================================
   Estilos de «Karaoke a la inversa» sobre el texto del capítulo
   ========================================================================== */
.hm-sentence {
  border-radius: 4px;
  padding: 0.06rem 0.12rem;
  margin: 0 -0.12rem;
  transition: background-color 0.18s ease;
  cursor: pointer;
}

.hm-sentence:hover {
  background-color: var(--bg-subtle);
}

.hm-sentence.is-active {
  background-color: var(--karaoke-sent);
  box-shadow: 0 0 0 2px var(--karaoke-sent);
}

.hm-word {
  border-radius: 3px;
  transition: background-color 0.08s ease, color 0.08s ease;
}

.hm-word.is-active {
  background-color: var(--karaoke-word);
  color: var(--text-main);
  font-weight: 700;
  text-decoration: underline;
  text-decoration-color: var(--brand-primary);
  text-decoration-thickness: 2px;
  text-underline-offset: 3px;
}

/* ==========================================================================
   Página de Lectura del Capítulo
   ========================================================================== */
.chapter-reader {
  background-color: var(--bg-surface);
  border: 1px solid var(--border-color);
  border-radius: 12px;
  padding: clamp(1.5rem, 4vw, 3.25rem);
  box-shadow: 0 6px 28px rgba(0, 0, 0, 0.04);
}

.chapter-meta {
  font-family: var(--font-sans);
  display: flex;
  align-items: center;
  gap: 0.75rem;
  flex-wrap: wrap;
  font-size: 0.82rem;
  color: var(--text-muted);
  margin-bottom: 1rem;
}

.chapter-pill {
  background-color: var(--bg-subtle);
  color: var(--brand-primary);
  font-weight: 700;
  padding: 0.2rem 0.6rem;
  border-radius: 999px;
  text-transform: uppercase;
  letter-spacing: 0.05em;
  font-size: 0.74rem;
}

.chapter-title {
  font-size: clamp(1.85rem, 1.5rem + 1.5vw, 2.55rem);
  line-height: 1.18;
  margin: 0 0 0.75rem;
  letter-spacing: -0.02em;
}

.chapter-lead {
  font-size: 1.12rem;
  color: var(--text-muted);
  font-style: italic;
  margin: 0 0 1.5rem;
  padding-bottom: 1.35rem;
  border-bottom: 1px solid var(--border-color);
}

.chapter-body p {
  margin: 0 0 1.35rem;
}

.chapter-body h2 {
  font-size: 1.4rem;
  line-height: 1.3;
  margin: 2.4rem 0 0.9rem;
  color: var(--text-main);
}

.chapter-body ol {
  margin: 1rem 0 1.5rem;
  padding-left: 1.4rem;
}

.chapter-body li {
  margin-bottom: 0.6rem;
}

.chapter-divider {
  border: 0;
  height: 1px;
  background-color: var(--border-color);
  margin: 2.25rem 0;
}

/* ==========================================================================
   Barra de Compartición en RRSS y Patrocinio Económico (PayPal)
   ========================================================================== */
.share-sponsor-bar {
  margin-top: 2.25rem;
  padding-top: 1.5rem;
  border-top: 1px solid var(--border-color);
  display: grid;
  grid-template-columns: 1.2fr 1fr;
  gap: 1.25rem;
  font-family: var(--font-sans);
}

@media (max-width: 680px) {
  .share-sponsor-bar {
    grid-template-columns: 1fr;
  }
}

.share-box,
.sponsor-box {
  background-color: var(--bg-subtle);
  border: 1px solid var(--border-color);
  border-radius: 10px;
  padding: 1.1rem;
}

.share-box h4,
.sponsor-box h4 {
  margin: 0 0 0.35rem;
  font-size: 0.92rem;
}

.share-box p,
.sponsor-box p {
  margin: 0 0 0.75rem;
  font-size: 0.82rem;
  color: var(--text-muted);
  line-height: 1.4;
}

.share-buttons {
  display: flex;
  flex-wrap: wrap;
  gap: 0.45rem;
}

.share-btn {
  font-family: var(--font-sans);
  font-size: 0.78rem;
  font-weight: 600;
  padding: 0.42rem 0.7rem;
  border-radius: 6px;
  border: 1px solid var(--border-color);
  background-color: var(--bg-surface);
  color: var(--text-main);
  text-decoration: none;
  cursor: pointer;
  display: inline-flex;
  align-items: center;
  gap: 0.3rem;
}

.share-btn:hover {
  border-color: var(--brand-primary);
  color: var(--brand-primary);
}

.btn-paypal {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  gap: 0.45rem;
  width: 100%;
  padding: 0.58rem 0.9rem;
  font-size: 0.86rem;
  font-weight: 700;
  border-radius: 6px;
  background-color: #0070ba;
  color: #ffffff;
  text-decoration: none;
}

.btn-paypal:hover {
  opacity: 0.92;
}

/* ==========================================================================
   Bloque de Doble Conversión (Suscripción Capítulos + Firma Oficial UE)
   ========================================================================== */
.conversion-box {
  margin-top: 2rem;
  padding: 1.75rem;
  background-color: var(--bg-page);
  border: 2px solid var(--brand-primary);
  border-radius: 12px;
  font-family: var(--font-sans);
}

.conversion-title {
  margin: 0 0 0.5rem;
  font-size: 1.25rem;
  color: var(--text-main);
}

.conversion-desc {
  margin: 0 0 1.25rem;
  font-size: 0.95rem;
  color: var(--text-muted);
  line-height: 1.5;
}

.conversion-grid {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 1.25rem;
}

@media (max-width: 680px) {
  .conversion-grid {
    grid-template-columns: 1fr;
  }
}

.conversion-card {
  background-color: var(--bg-surface);
  border: 1px solid var(--border-color);
  border-radius: 8px;
  padding: 1.15rem;
}

.conversion-card h4 {
  margin: 0 0 0.4rem;
  font-size: 0.98rem;
}

.conversion-card p {
  margin: 0 0 0.9rem;
  font-size: 0.86rem;
  color: var(--text-muted);
  line-height: 1.45;
}

.field {
  margin-bottom: 0.75rem;
}

.field label {
  display: block;
  font-size: 0.82rem;
  font-weight: 600;
  margin-bottom: 0.2rem;
}

/* MANDATORY: Format hint above input so autocomplete popovers don't cover it */
.hint {
  display: block;
  color: var(--text-muted);
  font-size: 0.78rem;
  margin-bottom: 0.35rem;
}

.email-input {
  width: 100%;
  padding: 0.55rem 0.75rem;
  font-size: 0.92rem;
  border: 1px solid var(--border-color);
  border-radius: 6px;
  background-color: var(--bg-page);
  color: var(--text-main);
}

.error-msg {
  display: none;
  color: var(--error-color);
  font-size: 0.8rem;
  margin-top: 0.3rem;
}

/* Validación diferida tras interacción (:user-invalid + fallback) */
.email-input:user-invalid,
.email-input.user-invalid-fallback {
  border-color: var(--error-color);
  background-color: var(--error-bg);
}

.email-input:user-invalid + .error-msg,
.email-input.user-invalid-fallback + .error-msg {
  display: block;
}

.email-input:user-valid,
.email-input.user-valid-fallback {
  border-color: var(--valid-color);
}

.btn-primary,
.btn-eu {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  width: 100%;
  padding: 0.65rem 1rem;
  font-size: 0.9rem;
  font-weight: 700;
  border-radius: 6px;
  text-decoration: none;
  cursor: pointer;
  border: none;
  transition: opacity 0.15s ease;
}

.btn-primary {
  background-color: var(--brand-primary);
  color: #ffffff;
}

.btn-eu {
  background-color: #ffcc00;
  color: #002266;
}

.btn-primary:hover,
.btn-eu:hover {
  opacity: 0.92;
}

.subscribe-feedback {
  margin-top: 0.5rem;
  font-size: 0.82rem;
  color: var(--valid-color);
  font-weight: 600;
}

.eu-legal-footer {
  max-width: 1120px;
  margin: 0 auto;
  padding: 1.5rem 1.25rem 3rem;
  border-top: 1px solid var(--border-color);
  font-family: var(--font-sans);
  font-size: 0.82rem;
  color: var(--text-muted);
  display: flex;
  justify-content: space-between;
  flex-wrap: wrap;
  gap: 1rem;
}

.eu-legal-footer a {
  color: var(--brand-primary);
}