/* ============================================================
   Mock estático — guia
   Mobile-first. Estilo provisional: se reestilizará en Fase 2+
   del diseño. Las variables de tema permiten re-colarorear sin
   tocar el resto del CSS.
   ============================================================ */

:root {
  /* Tipografía */
  --font-serif: Georgia, "Times New Roman", Times, serif;
  --font-sans: system-ui, -apple-system, "Segoe UI", Roboto,
    "Helvetica Neue", Arial, sans-serif;
  --font-body: var(--font-serif);
  --font-ui: var(--font-sans);

  /* Escala tipográfica (base 17px, ratio ~1.2 en móvil) */
  --fs-base: 1.0625rem;   /* 17px */
  --fs-sm: 0.9375rem;     /* 15px */
  --fs-lg: 1.25rem;       /* 20px */
  --fs-h2: 1.75rem;       /* 28px */
  --fs-h3: 1.3125rem;     /* 21px */
  --fs-cover: 2.25rem;    /* 36px */

  /* Color (tema provisional "papel") */
  --color-bg: #fbfaf7;
  --color-surface: #ffffff;
  --color-ink: #26221c;
  --color-ink-soft: #5c564c;
  --color-line: #e3ded4;
  --color-accent: #2f5d50;
  --color-accent-soft: #e8f0ed;
  --color-brand: #3C7AB9;  /* azul corporativo */
  --color-brand-green: #3EB06D;  /* verde corporativo */
  --color-highlight: #fdf3c4; /* resaltado :target */

  /* Medida de lectura y layout */
  --measure: 60rem;         /* 960px: contenedor de contenido */
  --measure-wide: 62rem;   /* para figuras/tablas que rompen la medida */
  --header-h-tall: 6rem;    /* 96px: header inicial */
  --header-h-shrunk: 4rem;  /* 64px: header al hacer scroll */
  --logo-h-tall: 3.5rem;    /* 56px: logo grande */
  --logo-h-shrunk: 2.25rem; /* 36px: logo pequeño */
  --gap-section: 3.5rem;

  --radius: 8px;
  --shadow-header: 0 1px 0 var(--color-line);
}

/* ---------- Reset mínimo ---------- */
*, *::before, *::after { box-sizing: border-box; }
html { -webkit-text-size-adjust: 100%; }
body {
  margin: 0;
  font-family: var(--font-body);
  font-size: var(--fs-base);
  line-height: 1.65;
  color: var(--color-ink);
  background-color: var(--color-bg);
  background-image: url('../bg-homepage.svg');
  background-size: cover;
  background-position: center;
  background-attachment: fixed;
  background-repeat: no-repeat;
}
img, svg { max-width: 100%; height: auto; display: block; }
a { color: var(--color-accent); text-underline-offset: 0.15em; }
a:hover { text-decoration-thickness: 2px; }
h1, h2, h3 { line-height: 1.2; margin: 0 0 0.5em; }

/* Scroll suave + compensación del header fijo */
html { scroll-behavior: smooth; scroll-padding-top: calc(var(--header-h-tall) + 1rem); }
@media (prefers-reduced-motion: reduce) {
  html { scroll-behavior: auto; }
}

/* ---------- Franjas azules corporativas ---------- */
.brand-bar {
  position: fixed;
  left: 0;
  right: 0;
  height: 8px;
  background: var(--color-brand);
  z-index: 101;
  pointer-events: none;
}
.brand-bar--top { top: 0; }
.brand-bar--bottom { bottom: 0; }

/* ---------- Contenedor de lectura ---------- */
.wrap {
  width: 100%;
  max-width: var(--measure);
  margin-inline: auto;
  padding-inline: 1.25rem;
}
.wrap--wide { max-width: var(--measure-wide); }

/* ---------- Header fijo ---------- */
.site-header {
  position: fixed;
  top: 8px;  /* debajo de la franja azul superior */
  left: 0;
  right: 0;
  z-index: 100;
  height: var(--header-h-tall);
  background: transparent;
  transition: height 0.3s ease, background 0.3s ease;
}
.site-header--shrunk {
  height: var(--header-h-shrunk);
  background: var(--color-surface);
  box-shadow: 0 1px 0 var(--color-line);
}
.site-header__inner {
  height: 100%;
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 1rem;
  max-width: var(--measure-wide);
  margin-inline: auto;
  padding-inline: 1.25rem;
}

/* ---------- Logo imagen ---------- */
.logo {
  display: inline-flex;
  align-items: center;
  text-decoration: none;
  flex-shrink: 0;
}
.logo__img {
  height: var(--logo-h-tall);
  width: auto;
  transition: height 0.3s ease;
}
.site-header--shrunk .logo__img {
  height: var(--logo-h-shrunk);
}

/* ---------- Navegación ---------- */
.nav-toggle {
  font-family: var(--font-ui);
  font-size: var(--fs-sm);
  background: none;
  border: 1px solid var(--color-line);
  border-radius: var(--radius);
  padding: 0.35rem 0.7rem;
  color: var(--color-ink);
  cursor: pointer;
  display: block; /* visible en móvil */
}
.nav {
  display: none; /* oculto en móvil por defecto */
  align-items: center;
}
.nav.is-open {
  display: block; /* visible cuando hamburguesa clickeada */
  position: absolute;
  top: 100%;
  right: 0;
  left: 0;
  background: var(--color-surface);
  border-bottom: 1px solid var(--color-line);
  padding: 0.75rem 1.25rem 1rem;
}
.nav ul {
  list-style: none;
  margin: 0;
  padding: 0;
  display: flex;
  flex-direction: column;
  gap: 0.65rem;
}
.nav.is-open ul {
  display: flex;
  flex-direction: column;
  gap: 0.65rem;
}
.nav a {
  font-family: var(--font-ui);
  font-size: var(--fs-sm);
  color: var(--color-brand);
  text-decoration: none;
  position: relative;
}
.nav a::after {
  content: '';
  position: absolute;
  left: 0;
  bottom: -2px;
  width: 0;
  height: 2px;
  background: var(--color-brand);
  transition: width 0.2s ease;
}
.nav a:hover { color: var(--color-brand); }
.nav a:hover::after { width: 100%; }

/* Desktop: nav siempre visible, hamburguesa oculta */
@media (min-width: 768px) {
  .nav-toggle {
    display: none;
  }
  .nav {
    display: flex;
    position: static;
    background: transparent;
    border: none;
    padding: 0;
  }
  .nav ul {
    display: flex;
    flex-direction: row;
    gap: 1.5rem;
  }
}

/* ---------- Portada ---------- */
.cover {
  min-height: 100svh;
  display: grid;
  align-content: center;
  padding-top: calc(var(--header-h-tall) + 3rem);
  text-align: center;
}
.cover__eyebrow {
  font-family: var(--font-ui);
  font-size: var(--fs-sm);
  letter-spacing: 0.18em;
  text-transform: uppercase;
  color: var(--color-accent);
  margin-bottom: 1rem;
  opacity: 0;
  transform: translateY(20px);
}
.cover h1 {
  font-family: Arial, "Helvetica Neue", Helvetica, sans-serif;
  font-size: clamp(1.75rem, 5vw, 2.5rem);
  line-height: 1.15;
  margin-bottom: 0.6em;
  color: var(--color-brand);
}
.cover__title-line {
  display: block;
  opacity: 0;
  transform: translateY(20px);
}
.cover__title-line--light {
  font-weight: 400;
}
.cover__title-line--bold {
  font-weight: 700;
  text-transform: uppercase;
}
.cover__subtitle {
  display: none;
}
.cover__lead {
  font-size: var(--fs-lg);
  color: var(--color-ink-soft);
  max-width: 40ch;
  margin: 0 auto 2rem;
  opacity: 0;
  transform: translateY(20px);
}
.btn {
  font-family: var(--font-ui);
  display: inline-block;
  padding: 0.7rem 1.4rem;
  border-radius: 999px;
  background: var(--color-brand);
  color: #fff;
  text-decoration: none;
  border: none;
  font-size: var(--fs-base);
  line-height: 1.4;
  cursor: pointer;
  opacity: 0;
  transform: translateY(20px);
}
.btn:hover { filter: brightness(1.08); }
.cover__scroll-hint {
  display: flex;
  justify-content: center;
  width: 100%;
  margin-top: 3rem;
  opacity: 0;
  transform: translateY(20px);
}
.cover__scroll-hint__circle {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  width: 3rem;
  height: 3rem;
  border: 2px solid var(--color-brand-green);
  border-radius: 50%;
  font-size: 1.5rem;
  color: var(--color-brand-green);
  cursor: pointer;
  animation: bounce 1.4s cubic-bezier(0.36, 0.07, 0.19, 0.97) infinite;
}

/* Animaciones de entrada de la portada */
.cover.is-loaded .cover__eyebrow {
  animation: fadeInUp 0.5s ease forwards;
  animation-delay: 0.1s;
}
.cover.is-loaded .cover__title-line:nth-child(1) {
  animation: fadeInUp 0.5s ease forwards;
  animation-delay: 0.2s;
}
.cover.is-loaded .cover__title-line:nth-child(2) {
  animation: fadeInUp 0.5s ease forwards;
  animation-delay: 0.3s;
}
.cover.is-loaded .cover__title-line:nth-child(3) {
  animation: fadeInUp 0.5s ease forwards;
  animation-delay: 0.4s;
}
.cover.is-loaded .cover__title-line:nth-child(4) {
  animation: fadeInUp 0.5s ease forwards;
  animation-delay: 0.5s;
}
.cover.is-loaded .cover__lead {
  animation: fadeInUp 0.5s ease forwards;
  animation-delay: 0.6s;
}
.cover.is-loaded .btn {
  animation: fadeInUp 0.5s ease forwards;
  animation-delay: 0.7s;
}
.cover.is-loaded .cover__scroll-hint {
  animation: fadeInUp 0.5s ease forwards;
  animation-delay: 0.8s;
}

/* ---------- Índice ---------- */
.toc {
  padding-block: var(--gap-section);
  border-top: 1px solid var(--color-line);
}
.toc h2 {
  font-family: var(--font-ui);
  font-size: 1rem;
  letter-spacing: 0.12em;
  text-transform: uppercase;
  color: var(--color-ink-soft);
}
.toc ol {
  list-style: none;
  counter-reset: toc;
  margin: 1.5rem 0 0;
  padding: 0;
  display: grid;
  gap: 0.75rem;
}
.toc li { counter-increment: toc; }
.toc a {
  display: flex;
  align-items: baseline;
  gap: 0.75rem;
  padding: 0.7rem 0.9rem;
  background: var(--color-surface);
  border: 1px solid var(--color-line);
  border-radius: var(--radius);
  text-decoration: none;
  color: var(--color-ink);
  font-family: var(--font-ui);
}
.toc a:hover { border-color: var(--color-accent); }
.toc a::before {
  content: counter(toc, decimal-leading-zero);
  font-variant-numeric: tabular-nums;
  color: var(--color-accent);
  font-weight: 700;
}
.toc .toc__count {
  margin-left: auto;
  font-size: var(--fs-sm);
  color: var(--color-ink-soft);
}

/* ---------- Capítulos ---------- */
main { padding-bottom: var(--gap-section); }

.chapter {
  padding-top: var(--gap-section);
  scroll-margin-top: var(--header-h);
}
.chapter__number {
  font-family: var(--font-ui);
  font-size: var(--fs-sm);
  letter-spacing: 0.16em;
  text-transform: uppercase;
  color: var(--color-accent);
}
.chapter > h2 {
  font-size: var(--fs-h2);
  margin-top: 0.3em;
}
.chapter__intro {
  color: var(--color-ink-soft);
  font-size: var(--fs-lg);
}
.chapter__rule {
  border: 0;
  border-top: 1px solid var(--color-line);
  margin: 2rem 0;
}

/* ---------- Items ---------- */
.item {
  padding-block: 1.75rem;
  scroll-margin-top: calc(var(--header-h) + 1rem);
}
.item + .item { border-top: 1px solid var(--color-line); }
.item > h3 {
  font-size: var(--fs-h3);
  font-family: var(--font-sans);
  font-weight: 700;
}
.item h4 {
  font-family: var(--font-ui);
  font-size: var(--fs-base);
  margin-top: 1.5em;
}
.item p { margin: 0 0 1em; }
.item ul, .item ol { margin: 0 0 1em; padding-left: 1.4em; }
.item li + li { margin-top: 0.3em; }

.item blockquote {
  margin: 1.5em 0;
  padding: 0.9em 1.1em;
  border-left: 4px solid var(--color-accent);
  background: var(--color-accent-soft);
  border-radius: 0 var(--radius) var(--radius) 0;
  font-style: italic;
}
.item blockquote p:last-child { margin-bottom: 0; }

/* Figuras: apiladas en móvil, flotan en desktop según clase */
.item figure {
  margin: 1.5em 0;
  background: var(--color-surface);
  border: 1px solid var(--color-line);
  border-radius: var(--radius);
  overflow: hidden;
}
.item figcaption {
  font-family: var(--font-ui);
  font-size: var(--fs-sm);
  color: var(--color-ink-soft);
  padding: 0.55rem 0.8rem;
  border-top: 1px solid var(--color-line);
}

/* Tablas: scroll horizontal en móvil (fichero libro/tablet) */
.table-wrap {
  overflow-x: auto;
  margin: 1.5em 0;
  -webkit-overflow-scrolling: touch;
}
.item table {
  width: 100%;
  border-collapse: collapse;
  font-family: var(--font-ui);
  font-size: var(--fs-sm);
  background: var(--color-surface);
}
.item th, .item td {
  border: 1px solid var(--color-line);
  padding: 0.5rem 0.75rem;
  text-align: left;
}
.item thead th {
  background: var(--color-accent-soft);
  color: var(--color-ink);
}

/* En desktop las figuras .fig-left/.fig-right flotan (tipo libro) */
@media (min-width: 48rem) {
  .item figure.fig-left,
  .item figure.fig-right {
    width: min(45%, 18rem);
    margin: 0.35em 1.5em 1em 0;
  }
  .item figure.fig-right {
    float: right;
    margin: 0.35em 0 1em 1.5em;
  }
  .item figure.fig-wide {
    width: 100%;
    float: none;
    margin-inline: 0;
  }
  .item::after { content: ""; display: table; clear: both; }
}

/* ---------- Modal ---------- */
.modal {
  position: fixed;
  inset: 0;
  z-index: 200;
  display: grid;
  align-items: end;
  opacity: 0;
  visibility: hidden;
  pointer-events: none;
  transition: opacity 0.25s ease, visibility 0.25s ease;
}
.modal.is-open {
  opacity: 1;
  visibility: visible;
  pointer-events: auto;
}
.modal__backdrop {
  position: fixed;
  inset: 0;
  background: rgba(38, 34, 28, 0);
  transition: background 0.25s ease;
}
.modal.is-open .modal__backdrop {
  background: rgba(38, 34, 28, 0.55);
}
.modal__panel {
  position: relative;
  z-index: 1;
  background: var(--color-surface);
  border-radius: var(--radius) var(--radius) 0 0;
  max-height: 92svh;
  display: flex;
  flex-direction: column;
  box-shadow: 0 -8px 30px rgba(0,0,0,0);
  transform: translateY(20px) scale(0.95);
  transition: transform 0.25s ease, box-shadow 0.25s ease;
}
.modal.is-open .modal__panel {
  transform: translateY(0) scale(1);
  box-shadow: 0 -8px 30px rgba(0,0,0,0.18);
}
@media (min-width: 48rem) {
  .modal { align-items: center; justify-items: center; }
  .modal__panel {
    border-radius: var(--radius);
    max-width: min(90vw, 42rem);
    max-height: 85vh;
    transform: scale(0.95);
  }
  .modal.is-open .modal__panel {
    transform: scale(1);
  }
}
.modal__header {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 1rem;
  padding: 0.9rem 1.2rem;
  border-bottom: 1px solid var(--color-line);
  flex-shrink: 0;
}
.modal__title {
  font-family: var(--font-ui);
  font-size: var(--fs-base);
  font-weight: 700;
  margin: 0;
}
.modal__close {
  background: none;
  border: none;
  font-size: 1.6rem;
  line-height: 1;
  color: var(--color-ink-soft);
  cursor: pointer;
  padding: 0.2rem 0.4rem;
}
.modal__close:hover { color: var(--color-ink); }
.modal__body {
  padding: 1.2rem;
  overflow-y: auto;
  -webkit-overflow-scrolling: touch;
}
.modal__body p { margin: 0 0 1em; }
.modal__body p:last-child { margin-bottom: 0; }
.modal__intro {
  font-style: italic;
  color: var(--color-ink-soft);
  padding-bottom: 0.8em;
  border-bottom: 1px solid var(--color-line);
  margin-bottom: 1.2em !important;
}
.modal__signature {
  font-style: italic;
  text-align: right;
}

/* Cierre del scroll del body cuando hay modal abierto */
body.modal-open { overflow: hidden; }

/* ---------- Acordeón de secciones ---------- */
.accordion {
  padding-top: var(--gap-section);
}
.accordion__section {
  border: 1px solid var(--color-line);
  border-radius: var(--radius);
  background: var(--color-surface);
  margin-bottom: 0.6rem;
  scroll-margin-top: calc(var(--header-h) + 1rem);
}
.accordion__heading {
  margin: 0;
}
.accordion__trigger {
  display: flex;
  align-items: center;
  gap: 0.75rem;
  width: 100%;
  padding: 1rem 1.1rem;
  background: none;
  border: none;
  cursor: pointer;
  text-align: left;
  font-family: var(--font-ui);
  font-size: var(--fs-base);
  color: var(--color-ink);
  border-radius: var(--radius);
}
.accordion__trigger:hover {
  background: none;
}
.accordion__number {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  width: 2.5rem;
  height: 2.5rem;
  background: var(--color-brand-green);
  color: #fff;
  font-weight: 700;
  transform: rotate(45deg);
  border-radius: 4px;
  flex-shrink: 0;
  font-variant-numeric: tabular-nums;
  margin-right: 0.5rem;
}
.accordion__number > * {
  transform: rotate(-45deg);
}
.accordion__title {
  flex: 1;
  font-weight: 600;
  line-height: 1.3;
  color: var(--color-brand);
}
.accordion__count {
  font-size: var(--fs-sm);
  color: var(--color-ink-soft);
  white-space: nowrap;
}
.accordion__icon {
  color: var(--color-accent);
  font-size: 1.1rem;
  transition: transform 0.2s ease;
  flex-shrink: 0;
}
.accordion__trigger[aria-expanded="true"] .accordion__icon {
  transform: rotate(90deg);
}
.accordion__panel {
  display: grid;
  grid-template-rows: 0fr;
  transition: grid-template-rows 0.3s ease;
  padding: 0 1.1rem;
  border-top: 1px solid transparent;
}
.accordion__panel.is-open {
  grid-template-rows: 1fr;
  border-top-color: var(--color-line);
  padding-bottom: 1rem;
}
.accordion__panel > * {
  overflow: hidden;
}
.accordion__items {
  list-style: none;
  margin: 0.75rem 0 0;
  padding: 0;
}
.accordion__item {
  display: block;
  width: 100%;
  text-align: left;
  padding: 0.55rem 0.75rem;
  background: none;
  border: none;
  border-left: 3px solid var(--color-line);
  cursor: pointer;
  color: var(--color-brand);
  font-family: var(--font-ui);
  font-size: var(--fs-sm);
  line-height: 1.4;
  border-radius: 0 var(--radius) var(--radius) 0;
  opacity: 0;
  transform: translateY(-10px);
  transition: opacity 0.3s ease, transform 0.3s ease;
}
.accordion__panel.is-open .accordion__item {
  opacity: 1;
  transform: translateY(0);
}
.accordion__panel.is-open .accordion__item:nth-child(1) { transition-delay: 0.05s; }
.accordion__panel.is-open .accordion__item:nth-child(2) { transition-delay: 0.1s; }
.accordion__panel.is-open .accordion__item:nth-child(3) { transition-delay: 0.15s; }
.accordion__panel.is-open .accordion__item:nth-child(4) { transition-delay: 0.2s; }
.accordion__panel.is-open .accordion__item:nth-child(5) { transition-delay: 0.25s; }
.accordion__panel.is-open .accordion__item:nth-child(6) { transition-delay: 0.3s; }
.accordion__panel.is-open .accordion__item:nth-child(7) { transition-delay: 0.35s; }
.accordion__panel.is-open .accordion__item:nth-child(8) { transition-delay: 0.4s; }
.accordion__panel.is-open .accordion__item:nth-child(9) { transition-delay: 0.45s; }
.accordion__item + .accordion__item {
  margin-top: 0.25rem;
}
.accordion__item:hover {
  border-left-color: var(--color-accent);
  background: var(--color-accent-soft);
}
.accordion__intro {
  padding-top: 0.75rem;
  color: var(--color-ink-soft);
  font-size: var(--fs-sm);
}
.accordion__intro p {
  margin: 0 0 0.6em;
}

/* ---------- Animaciones ---------- */
@keyframes bounce {
  0%, 100% { transform: translateY(0); }
  15% { transform: translateY(-10px); }
  30% { transform: translateY(0); }
  45% { transform: translateY(-6px); }
  60% { transform: translateY(0); }
  75% { transform: translateY(-2px); }
}
@keyframes fadeInUp {
  from {
    opacity: 0;
    transform: translateY(20px);
  }
  to {
    opacity: 1;
    transform: translateY(0);
  }
}
@keyframes fadeIn {
  from { opacity: 0; }
  to { opacity: 1; }
}
@keyframes scaleIn {
  from {
    opacity: 0;
    transform: scale(0.95);
  }
  to {
    opacity: 1;
    transform: scale(1);
  }
}

@media (prefers-reduced-motion: reduce) {
  * {
    animation-duration: 0.01ms !important;
    animation-iteration-count: 1 !important;
    transition-duration: 0.01ms !important;
  }
}

/* ---------- Resaltado de ancla (:target) ---------- */
:target { animation: target-flash 2.5s ease-out 1; }
@keyframes target-flash {
  0%, 55% { background: var(--color-highlight); }
  100% { background: transparent; }
}
@media (prefers-reduced-motion: reduce) {
  :target { animation: none; background: var(--color-highlight); }
}

/* ---------- Footer ---------- */
.site-footer {
  border-top: 1px solid var(--color-line);
  padding-block: 2rem;
  font-family: var(--font-ui);
  font-size: var(--fs-sm);
  color: var(--color-ink-soft);
  text-align: center;
}
.site-footer a { color: var(--color-ink-soft); }

/* ---------- Utilidades ---------- */
.sr-only {
  position: absolute;
  width: 1px; height: 1px;
  padding: 0; margin: -1px;
  overflow: hidden;
  clip: rect(0 0 0 0);
  white-space: nowrap;
  border: 0;
}