/* ==========================================================================
   jota.cl — Formato Editorial Suizo (Propuesta 01) + Paleta Nórdica (Propuesta 02)
   Paleta: Blanco Alabastro (#FAFAF8) · Niebla Acero (#EEF2F6) · Azul Noche (#0D1B2A) · Cobalto (#1B4965 / #296EB4)
   Tipografía: Instrument Serif · Plus Jakarta Sans · IBM Plex Mono
   ========================================================================== */

@import url('https://fonts.googleapis.com/css2?family=IBM+Plex+Mono:ital,wght@0,400;0,500;1,400&family=Instrument+Serif:ital@0,400;1,400&family=Plus+Jakarta+Sans:wght@400;500;600;700&display=swap');

:root {
  /* Superficies Claras (Blanco Alabastro & Niebla Acero — Paleta 02) */
  --bg-paper: #FAFAF8;
  --bg-sand: #EEF2F6;
  --bg-warm-white: #FFFFFF;
  
  /* Superficies Oscuras (Azul Noche Profundo & Pizarra Marina — Paleta 02) */
  --bg-ink: #0D1B2A;
  --bg-graphite: #13263B;
  --bg-graphite-2: #1A324C;

  /* Textos sobre Claro */
  --text-ink: #0D1B2A;
  --text-stone: #415A77;
  --text-muted-light: #6C7D93;

  /* Textos sobre Oscuro */
  --text-ivory: #F8FAFC;
  --text-ash: #CBD5E1;
  --text-muted-dark: #8FA3B8;

  /* Acentos Ejecutivos (Azul Cobalto & Salvia Nórdico — Paleta 02) */
  --accent-copper: #296EB4;
  --accent-copper-hover: #1B4965;
  --accent-copper-light: #7CC4FA;
  --accent-steel: #1B4965;
  --accent-steel-light: #60A5FA;
  --accent-forest: #2D6A4F;
  --accent-forest-light: #34D399;

  /* Líneas Estructurales (1px Swiss Grid en Acero y Azul Noche) */
  --border-light: #DCE4EE;
  --border-light-strong: #C2CFE0;
  --border-dark: #1E344B;
  --border-dark-strong: #2C4A69;

  /* Tipografía */
  --font-serif: 'Instrument Serif', Georgia, serif;
  --font-sans: 'Plus Jakarta Sans', -apple-system, BlinkMacSystemFont, sans-serif;
  --font-mono: 'IBM Plex Mono', monospace;

  /* Dimensiones */
  --container-max: 1320px;
  --header-height: 68px;
}

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

html {
  scroll-behavior: smooth;
  font-size: 16px;
  -webkit-font-smoothing: antialiased;
  -moz-osx-font-smoothing: grayscale;
}

body {
  font-family: var(--font-sans);
  background-color: var(--bg-paper);
  color: var(--text-ink);
  line-height: 1.65;
  overflow-x: hidden;
}

/* Accesibilidad de Teclado */
:focus-visible {
  outline: 2px solid var(--accent-copper);
  outline-offset: 3px;
}

::selection {
  background-color: var(--accent-copper);
  color: var(--text-ivory);
}

/* ==========================================================================
   Utilidades de Tema & Contenedores
   ========================================================================== */

.theme-ink {
  background-color: var(--bg-ink);
  color: var(--text-ivory);
}

.theme-paper {
  background-color: var(--bg-paper);
  color: var(--text-ink);
}

.theme-sand {
  background-color: var(--bg-sand);
  color: var(--text-ink);
}

.container {
  max-width: var(--container-max);
  margin: 0 auto;
  padding: 0 32px;
}

/* ==========================================================================
   Cabecera Editorial (Header)
   ========================================================================== */

.site-header {
  position: sticky;
  top: 0;
  z-index: 100;
  height: var(--header-height);
  background: rgba(13, 27, 42, 0.93);
  backdrop-filter: blur(12px);
  -webkit-backdrop-filter: blur(12px);
  border-bottom: 1px solid var(--border-dark);
  color: var(--text-ivory);
  transition: background 0.25s ease, border-color 0.25s ease;
}

.header-inner {
  max-width: var(--container-max);
  margin: 0 auto;
  padding: 0 32px;
  height: 100%;
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 24px;
}

.brand {
  display: flex;
  align-items: center;
  gap: 14px;
  text-decoration: none;
  color: var(--text-ivory);
}

.brand-monogram {
  width: 34px;
  height: 34px;
  border: 1px solid var(--border-dark-strong);
  background: var(--bg-graphite);
  display: inline-flex;
  align-items: center;
  justify-content: center;
  font-family: var(--font-mono);
  font-size: 0.85rem;
  font-weight: 500;
  color: var(--text-ivory);
  position: relative;
  flex-shrink: 0;
}

.brand-monogram::after {
  content: '';
  position: absolute;
  bottom: 5px;
  right: 5px;
  width: 5px;
  height: 5px;
  border-radius: 50%;
  background: var(--accent-copper);
}

.brand-text {
  display: flex;
  flex-direction: column;
  line-height: 1.15;
}

.brand-name {
  font-weight: 700;
  font-size: 0.98rem;
  letter-spacing: -0.02em;
}

.brand-role {
  font-family: var(--font-mono);
  font-size: 0.7rem;
  color: var(--text-ash);
  letter-spacing: 0.02em;
}

.nav-desktop {
  display: flex;
  align-items: center;
  gap: 4px;
  list-style: none;
}

.nav-link {
  display: inline-flex;
  align-items: center;
  gap: 6px;
  min-height: 44px;
  padding: 0 12px;
  color: var(--text-ash);
  text-decoration: none;
  font-size: 0.86rem;
  font-weight: 500;
  transition: color 0.2s ease;
}

.nav-link .nav-num {
  font-family: var(--font-mono);
  font-size: 0.72rem;
  color: var(--accent-copper-light);
}

.nav-link:hover,
.nav-link.active {
  color: var(--text-ivory);
}

.header-actions {
  display: flex;
  align-items: center;
  gap: 12px;
}

.link-boit-header {
  font-family: var(--font-mono);
  font-size: 0.78rem;
  color: var(--text-ash);
  text-decoration: none;
  padding: 8px 12px;
  min-height: 44px;
  display: inline-flex;
  align-items: center;
  gap: 5px;
  border: 1px solid var(--border-dark);
  transition: all 0.2s ease;
}

.link-boit-header:hover {
  color: var(--text-ivory);
  border-color: var(--accent-steel-light);
  background: rgba(43, 91, 132, 0.15);
}

.btn-header-cta {
  background: var(--accent-copper);
  color: var(--text-ivory);
  font-size: 0.85rem;
  font-weight: 600;
  padding: 0 18px;
  min-height: 44px;
  display: inline-flex;
  align-items: center;
  text-decoration: none;
  transition: background 0.2s ease, transform 0.15s ease;
}

.btn-header-cta:hover {
  background: var(--accent-copper-hover);
}

/* Botón Menú Móvil */
.menu-toggle {
  display: none;
  width: 44px;
  height: 44px;
  background: transparent;
  border: 1px solid var(--border-dark-strong);
  color: var(--text-ivory);
  align-items: center;
  justify-content: center;
  cursor: pointer;
}

/* Cajón de Navegación Móvil */
.mobile-drawer {
  position: fixed;
  inset: 0;
  z-index: 200;
  background: var(--bg-ink);
  color: var(--text-ivory);
  padding: 24px;
  display: flex;
  flex-direction: column;
  justify-content: space-between;
  transform: translateY(-100%);
  transition: transform 0.35s cubic-bezier(0.22, 1, 0.36, 1);
  visibility: hidden;
}

.mobile-drawer.is-open {
  transform: translateY(0);
  visibility: visible;
}

.mobile-drawer-header {
  display: flex;
  align-items: center;
  justify-content: space-between;
  padding-bottom: 20px;
  border-bottom: 1px solid var(--border-dark);
}

.mobile-nav-list {
  list-style: none;
  display: flex;
  flex-direction: column;
  gap: 8px;
  margin: auto 0;
}

.mobile-nav-link {
  display: flex;
  align-items: baseline;
  gap: 16px;
  padding: 14px 0;
  min-height: 48px;
  color: var(--text-ivory);
  text-decoration: none;
  font-size: 1.5rem;
  font-weight: 600;
  border-bottom: 1px solid var(--border-dark);
}

.mobile-nav-link span {
  font-family: var(--font-mono);
  font-size: 0.85rem;
  color: var(--accent-copper-light);
}

.mobile-drawer-footer {
  padding-top: 20px;
  border-top: 1px solid var(--border-dark);
  display: flex;
  flex-direction: column;
  gap: 12px;
}

/* ==========================================================================
   Hero — Monografía Ejecutiva (Fondo Tinta Profunda)
   ========================================================================== */

.hero {
  position: relative;
  border-bottom: 1px solid var(--border-dark);
  overflow: hidden;
}

/* Grilla arquitectónica de fondo sutil */
.hero::before {
  content: '';
  position: absolute;
  inset: 0;
  background-image: 
    linear-gradient(to right, rgba(255, 255, 255, 0.025) 1px, transparent 1px),
    linear-gradient(to bottom, rgba(255, 255, 255, 0.025) 1px, transparent 1px);
  background-size: 80px 80px;
  pointer-events: none;
}

.hero-grid {
  display: grid;
  grid-template-columns: 7fr 5fr;
  border-left: 1px solid var(--border-dark);
  border-right: 1px solid var(--border-dark);
  position: relative;
  z-index: 1;
}

.hero-main {
  padding: 72px 56px 72px 48px;
  border-right: 1px solid var(--border-dark);
  display: flex;
  flex-direction: column;
  justify-content: space-between;
}

.hero-kicker {
  display: inline-flex;
  align-items: center;
  gap: 10px;
  font-family: var(--font-mono);
  font-size: 0.76rem;
  text-transform: uppercase;
  letter-spacing: 0.1em;
  color: var(--accent-copper-light);
  margin-bottom: 28px;
}

.hero-kicker-dot {
  width: 8px;
  height: 8px;
  border-radius: 50%;
  background: var(--accent-copper);
}

.hero-title {
  font-size: clamp(2.4rem, 4.6vw, 4.25rem);
  font-weight: 700;
  line-height: 1.07;
  letter-spacing: -0.03em;
  color: var(--text-ivory);
  margin-bottom: 28px;
}

.hero-title em {
  font-family: var(--font-serif);
  font-style: italic;
  font-weight: 400;
  color: var(--accent-copper-light);
  font-size: 1.12em;
  padding-right: 4px;
}

.hero-lead {
  font-size: clamp(1.05rem, 1.35vw, 1.2rem);
  line-height: 1.7;
  color: var(--text-ash);
  max-width: 60ch;
  margin-bottom: 44px;
}

.hero-lead strong {
  color: var(--text-ivory);
  font-weight: 600;
}

.hero-ctas {
  display: flex;
  flex-wrap: wrap;
  gap: 14px;
}

.btn-primary {
  background: var(--accent-copper);
  color: var(--text-ivory);
  font-family: var(--font-sans);
  font-size: 0.92rem;
  font-weight: 600;
  padding: 0 26px;
  min-height: 48px;
  display: inline-flex;
  align-items: center;
  gap: 10px;
  text-decoration: none;
  border: 1px solid var(--accent-copper);
  cursor: pointer;
  transition: all 0.2s ease;
}

.btn-primary:hover {
  background: var(--accent-copper-hover);
  transform: translateY(-1px);
}

.btn-secondary {
  background: transparent;
  color: var(--text-ivory);
  font-family: var(--font-sans);
  font-size: 0.92rem;
  font-weight: 500;
  padding: 0 24px;
  min-height: 48px;
  display: inline-flex;
  align-items: center;
  gap: 10px;
  text-decoration: none;
  border: 1px solid var(--border-dark-strong);
  cursor: pointer;
  transition: all 0.2s ease;
}

.btn-secondary:hover {
  border-color: var(--text-ivory);
  background: rgba(255, 255, 255, 0.04);
}

/* Columna Derecha del Hero: Dossier & Composición Visual */
.hero-aside {
  display: flex;
  flex-direction: column;
  justify-content: space-between;
  background: var(--bg-graphite);
}

.hero-visual-frame {
  position: relative;
  border-bottom: 1px solid var(--border-dark);
  overflow: hidden;
  aspect-ratio: 16 / 11;
  background: #09131E;
}

.hero-visual-frame img {
  width: 100%;
  height: 100%;
  object-fit: cover;
  display: block;
  filter: contrast(1.03) brightness(0.96);
  transition: transform 0.6s ease;
}

.hero-visual-frame:hover img {
  transform: scale(1.02);
}

.hero-visual-caption {
  position: absolute;
  bottom: 0;
  left: 0;
  right: 0;
  padding: 10px 16px;
  background: linear-gradient(to top, rgba(13, 27, 42, 0.92), rgba(13, 27, 42, 0));
  font-family: var(--font-mono);
  font-size: 0.72rem;
  color: var(--text-ash);
  display: flex;
  justify-content: space-between;
}

.hero-dossier {
  padding: 28px 32px;
  display: flex;
  flex-direction: column;
  gap: 18px;
}

.dossier-header {
  font-family: var(--font-mono);
  font-size: 0.72rem;
  text-transform: uppercase;
  letter-spacing: 0.08em;
  color: var(--text-muted-dark);
  padding-bottom: 10px;
  border-bottom: 1px solid var(--border-dark);
  display: flex;
  justify-content: space-between;
}

.dossier-rows {
  display: flex;
  flex-direction: column;
  gap: 12px;
}

.dossier-row {
  display: grid;
  grid-template-columns: 120px 1fr;
  gap: 12px;
  font-size: 0.86rem;
  line-height: 1.45;
}

.dossier-label {
  font-family: var(--font-mono);
  font-size: 0.75rem;
  color: var(--text-muted-dark);
}

.dossier-value {
  color: var(--text-ivory);
  font-weight: 500;
}

.dossier-value a {
  color: var(--accent-copper-light);
  text-decoration: none;
  border-bottom: 1px solid rgba(124, 196, 250, 0.45);
}

/* Barra Inferior del Hero: Índices de Dominio */
.hero-ledger {
  display: grid;
  grid-template-columns: repeat(4, 1fr);
  border-left: 1px solid var(--border-dark);
  border-right: 1px solid var(--border-dark);
  border-top: 1px solid var(--border-dark);
  background: rgba(13, 27, 42, 0.85);
}

.ledger-item {
  padding: 24px 28px;
  border-right: 1px solid var(--border-dark);
  display: flex;
  flex-direction: column;
  gap: 6px;
}

.ledger-item:last-child {
  border-right: none;
}

.ledger-index {
  font-family: var(--font-mono);
  font-size: 0.72rem;
  color: var(--accent-copper-light);
}

.ledger-title {
  font-size: 1.05rem;
  font-weight: 700;
  color: var(--text-ivory);
  letter-spacing: -0.01em;
}

.ledger-desc {
  font-size: 0.82rem;
  color: var(--text-ash);
  line-height: 1.45;
}

/* ==========================================================================
   Estructura de Capítulos (Grilla Suiza Asimétrica)
   ========================================================================== */

.editorial-section {
  border-bottom: 1px solid var(--border-light);
}

.theme-ink.editorial-section {
  border-bottom: 1px solid var(--border-dark);
}

.chapter-grid {
  display: grid;
  grid-template-columns: 340px 1fr;
  border-left: 1px solid var(--border-light);
  border-right: 1px solid var(--border-light);
}

.theme-ink .chapter-grid {
  border-left-color: var(--border-dark);
  border-right-color: var(--border-dark);
}

/* Columna Izquierda Sticky del Capítulo */
.chapter-sidebar {
  padding: 44px 36px;
  border-right: 1px solid var(--border-light);
}

.theme-ink .chapter-sidebar {
  border-right-color: var(--border-dark);
}

.chapter-sticky {
  position: sticky;
  top: calc(var(--header-height) + 32px);
  display: flex;
  flex-direction: column;
  gap: 12px;
}

.chapter-number {
  font-family: var(--font-mono);
  font-size: 0.82rem;
  font-weight: 500;
  color: var(--accent-copper);
  letter-spacing: 0.08em;
  text-transform: uppercase;
}

.theme-ink .chapter-number {
  color: var(--accent-copper-light);
}

.chapter-title {
  font-size: clamp(1.65rem, 2.4vw, 2.15rem);
  font-weight: 700;
  line-height: 1.15;
  letter-spacing: -0.025em;
}

.chapter-title em {
  font-family: var(--font-serif);
  font-style: italic;
  font-weight: 400;
  font-size: 1.12em;
}

.chapter-summary {
  font-size: 0.92rem;
  color: var(--text-stone);
  line-height: 1.55;
}

.theme-ink .chapter-summary {
  color: var(--text-ash);
}

.chapter-meta {
  margin-top: 12px;
  padding-top: 12px;
  border-top: 1px solid var(--border-light);
  font-family: var(--font-mono);
  font-size: 0.74rem;
  color: var(--text-muted-light);
  display: flex;
  flex-direction: column;
  gap: 6px;
}

.theme-ink .chapter-meta {
  border-top-color: var(--border-dark);
  color: var(--text-muted-dark);
}

/* Columna Derecha de Contenido del Capítulo */
.chapter-content {
  display: flex;
  flex-direction: column;
}

.chapter-intro {
  padding: 40px 48px 32px;
  border-bottom: 1px solid var(--border-light);
}

.theme-ink .chapter-intro {
  border-bottom-color: var(--border-dark);
}

.editorial-Statement {
  font-family: var(--font-serif);
  font-size: clamp(1.5rem, 2.3vw, 2.1rem);
  line-height: 1.3;
  color: var(--text-ink);
  max-width: 46ch;
  margin-bottom: 16px;
}

.theme-ink .editorial-Statement {
  color: var(--text-ivory);
}

.editorial-prose {
  font-size: 1rem;
  color: var(--text-stone);
  max-width: 65ch;
  line-height: 1.65;
}

.theme-ink .editorial-prose {
  color: var(--text-ash);
}

/* ==========================================================================
   Capítulo 01: Las 4 Dimensiones de Práctica (Grilla 2x2 con trazos 1px)
   ========================================================================== */

.practice-matrix {
  display: grid;
  grid-template-columns: 1fr 1fr;
}

.practice-cell {
  padding: 36px 40px;
  border-right: 1px solid var(--border-light);
  border-bottom: 1px solid var(--border-light);
  display: flex;
  flex-direction: column;
  justify-content: space-between;
  gap: 20px;
  background: var(--bg-paper);
  transition: background 0.25s ease;
}

.practice-cell:nth-child(2n) {
  border-right: none;
}

.practice-cell:nth-last-child(-n+2) {
  border-bottom: none;
}

.practice-cell:hover {
  background: var(--bg-warm-white);
}

.practice-top {
  display: flex;
  flex-direction: column;
  gap: 10px;
}

.practice-header {
  display: flex;
  align-items: center;
  justify-content: space-between;
}

.practice-idx {
  font-family: var(--font-mono);
  font-size: 0.76rem;
  color: var(--accent-copper);
  font-weight: 500;
}

.practice-domain-tag {
  font-family: var(--font-mono);
  font-size: 0.7rem;
  text-transform: uppercase;
  letter-spacing: 0.06em;
  padding: 3px 10px;
  background: var(--bg-sand);
  color: var(--text-stone);
}

.practice-cell h3 {
  font-size: 1.24rem;
  font-weight: 700;
  letter-spacing: -0.02em;
  line-height: 1.25;
  color: var(--text-ink);
}

.practice-cell p {
  font-size: 0.92rem;
  color: var(--text-stone);
  line-height: 1.55;
}

.practice-capabilities {
  list-style: none;
  display: flex;
  flex-direction: column;
  gap: 6px;
  padding-top: 14px;
  border-top: 1px solid var(--border-light);
}

.practice-capabilities li {
  font-size: 0.85rem;
  color: var(--text-ink);
  display: flex;
  align-items: baseline;
  gap: 10px;
}

.practice-capabilities li::before {
  content: '—';
  font-family: var(--font-mono);
  color: var(--accent-copper);
  flex-shrink: 0;
}

/* ==========================================================================
   Capítulo 02: Radiografía Interactiva de Sistemas (Fondo Tinta)
   ========================================================================== */

.systems-explorer {
  display: flex;
  flex-direction: column;
}

/* Selector de Sistemas Principales */
.systems-tabs {
  display: grid;
  grid-template-columns: repeat(4, 1fr);
  border-bottom: 1px solid var(--border-dark);
  background: var(--bg-ink);
}

.system-tab {
  padding: 20px 22px;
  min-height: 76px;
  background: transparent;
  border: none;
  border-right: 1px solid var(--border-dark);
  color: var(--text-ash);
  text-align: left;
  cursor: pointer;
  display: flex;
  flex-direction: column;
  justify-content: space-between;
  gap: 6px;
  transition: all 0.2s ease;
  position: relative;
}

.system-tab:last-child {
  border-right: none;
}

.system-tab::before {
  content: '';
  position: absolute;
  top: 0;
  left: 0;
  right: 0;
  height: 3px;
  background: transparent;
  transition: background 0.2s ease;
}

.system-tab:hover {
  background: var(--bg-graphite);
  color: var(--text-ivory);
}

.system-tab.is-active {
  background: var(--bg-graphite);
  color: var(--text-ivory);
}

.system-tab.is-active::before {
  background: var(--accent-copper);
}

.tab-num {
  font-family: var(--font-mono);
  font-size: 0.72rem;
  color: var(--accent-copper-light);
}

.tab-name {
  font-family: var(--font-sans);
  font-size: 0.9rem;
  font-weight: 600;
  line-height: 1.3;
}

/* Panel Activo del Sistema */
.system-panel {
  display: none;
  flex-direction: column;
}

.system-panel.is-active {
  display: flex;
  animation: fadePanel 0.3s ease;
}

@keyframes fadePanel {
  from { opacity: 0; transform: translateY(4px); }
  to { opacity: 1; transform: translateY(0); }
}

.system-header {
  padding: 36px 44px 28px;
  border-bottom: 1px solid var(--border-dark);
  display: flex;
  flex-direction: column;
  gap: 12px;
}

.system-meta-bar {
  display: flex;
  flex-wrap: wrap;
  align-items: center;
  gap: 12px;
}

.system-badge {
  font-family: var(--font-mono);
  font-size: 0.72rem;
  text-transform: uppercase;
  letter-spacing: 0.06em;
  padding: 4px 12px;
  border: 1px solid var(--accent-copper);
  color: var(--accent-copper-light);
  background: rgba(41, 110, 180, 0.18);
}

.system-context {
  font-family: var(--font-mono);
  font-size: 0.76rem;
  color: var(--text-ash);
}

.system-title {
  font-size: clamp(1.45rem, 2.2vw, 1.9rem);
  font-weight: 700;
  color: var(--text-ivory);
  letter-spacing: -0.02em;
  line-height: 1.2;
}

.system-challenge {
  font-size: 0.98rem;
  color: var(--text-ash);
  max-width: 66ch;
  line-height: 1.6;
}

.system-challenge strong {
  color: var(--text-ivory);
}

/* Esquema Arquitectónico (SVG Blueprint) */
.blueprint-container {
  padding: 36px 56px;
  background: #09131E;
  border-bottom: 1px solid var(--border-dark);
}

.blueprint-label {
  font-family: var(--font-mono);
  font-size: 0.72rem;
  text-transform: uppercase;
  letter-spacing: 0.08em;
  color: var(--text-muted-dark);
  margin-bottom: 20px;
  display: flex;
  justify-content: space-between;
}

.blueprint-svg-wrap {
  width: 100%;
  overflow-x: auto;
  border: 1px solid var(--border-dark);
  background: var(--bg-ink);
  padding: 24px;
}

.blueprint-svg-wrap svg {
  width: 100%;
  height: auto;
  min-width: 640px;
  display: block;
}

/* Los 3 Pilares del Caso de Estudio */
.system-layers {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
}

.layer-card {
  padding: 32px 36px;
  border-right: 1px solid var(--border-dark);
  display: flex;
  flex-direction: column;
  gap: 10px;
}

.layer-card:last-child {
  border-right: none;
}

.layer-num {
  font-family: var(--font-mono);
  font-size: 0.72rem;
  color: var(--accent-copper-light);
  text-transform: uppercase;
  letter-spacing: 0.06em;
}

.layer-card h4 {
  font-size: 1.05rem;
  font-weight: 600;
  color: var(--text-ivory);
  line-height: 1.35;
}

.layer-card p {
  font-size: 0.88rem;
  color: var(--text-ash);
  line-height: 1.55;
}

/* Pie de Ficha: Impacto & Tecnologías */
.system-footer {
  padding: 24px 44px;
  background: var(--bg-graphite);
  display: flex;
  flex-wrap: wrap;
  align-items: center;
  justify-content: space-between;
  gap: 20px;
}

.system-impact {
  display: flex;
  align-items: center;
  gap: 12px;
  font-size: 0.9rem;
  color: var(--text-ivory);
}

.impact-dot {
  width: 8px;
  height: 8px;
  border-radius: 50%;
  background: var(--accent-forest-light);
  flex-shrink: 0;
}

.system-stack {
  display: flex;
  flex-wrap: wrap;
  gap: 8px;
}

.stack-tag {
  font-family: var(--font-mono);
  font-size: 0.74rem;
  padding: 4px 10px;
  background: var(--bg-ink);
  border: 1px solid var(--border-dark-strong);
  color: var(--text-ash);
}

/* Índice Complementario: Otros Desarrollos & Laboratorio */
.archive-block {
  padding: 36px 44px;
}

.archive-heading {
  font-family: var(--font-mono);
  font-size: 0.78rem;
  text-transform: uppercase;
  letter-spacing: 0.08em;
  color: var(--accent-copper-light);
  margin-bottom: 20px;
}

.archive-table {
  display: flex;
  flex-direction: column;
  border-top: 1px solid var(--border-dark);
}

.archive-row {
  display: grid;
  grid-template-columns: 180px 1fr 220px;
  gap: 24px;
  padding: 16px 0;
  border-bottom: 1px solid var(--border-dark);
  align-items: baseline;
}

.archive-domain {
  font-family: var(--font-mono);
  font-size: 0.78rem;
  color: var(--text-ivory);
  font-weight: 500;
}

.archive-desc {
  font-size: 0.9rem;
  color: var(--text-ash);
  line-height: 1.5;
}

.archive-desc strong {
  color: var(--text-ivory);
}

.archive-tech {
  font-family: var(--font-mono);
  font-size: 0.75rem;
  color: var(--text-muted-dark);
  text-align: right;
}

/* ==========================================================================
   Capítulo 03: Rol Ejecutivo en BOiT (Papel Arquitectónico + Azul Acero)
   ========================================================================== */

.boit-banner {
  margin: 36px 44px;
  padding: 32px 36px;
  background: var(--bg-ink);
  color: var(--text-ivory);
  border-left: 4px solid var(--accent-steel-light);
  display: flex;
  flex-wrap: wrap;
  align-items: center;
  justify-content: space-between;
  gap: 24px;
}

.boit-banner-info {
  max-width: 54ch;
}

.boit-kicker {
  font-family: var(--font-mono);
  font-size: 0.72rem;
  text-transform: uppercase;
  letter-spacing: 0.08em;
  color: var(--accent-steel-light);
  margin-bottom: 6px;
}

.boit-banner-info h3 {
  font-size: 1.35rem;
  font-weight: 700;
  margin-bottom: 8px;
  letter-spacing: -0.02em;
}

.boit-banner-info p {
  font-size: 0.92rem;
  color: var(--text-ash);
  line-height: 1.55;
}

.boit-actions {
  display: flex;
  flex-wrap: wrap;
  gap: 12px;
}

.btn-steel {
  background: var(--accent-steel);
  color: var(--text-ivory);
  font-size: 0.9rem;
  font-weight: 600;
  padding: 0 24px;
  min-height: 46px;
  display: inline-flex;
  align-items: center;
  gap: 8px;
  text-decoration: none;
  transition: background 0.2s ease;
}

.btn-steel:hover {
  background: #356D9E;
}

.boit-pillars {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  border-top: 1px solid var(--border-light);
}

.boit-pillar {
  padding: 32px 36px;
  border-right: 1px solid var(--border-light);
  display: flex;
  flex-direction: column;
  gap: 10px;
}

.boit-pillar:last-child {
  border-right: none;
}

.boit-pillar-num {
  font-family: var(--font-mono);
  font-size: 0.74rem;
  color: var(--accent-steel);
  font-weight: 500;
}

.boit-pillar h4 {
  font-size: 1.08rem;
  font-weight: 700;
  color: var(--text-ink);
}

.boit-pillar p {
  font-size: 0.88rem;
  color: var(--text-stone);
  line-height: 1.55;
}

/* ==========================================================================
   Capítulo 04: Formación Continua & Laboratorio Propio
   ========================================================================== */

.formation-timeline {
  display: flex;
  flex-direction: column;
}

.formation-item {
  display: grid;
  grid-template-columns: 180px 1fr;
  gap: 24px;
  padding: 28px 44px;
  border-bottom: 1px solid var(--border-light);
  background: var(--bg-paper);
  transition: background 0.2s ease;
}

.formation-item:last-child {
  border-bottom: none;
}

.formation-item:hover {
  background: var(--bg-warm-white);
}

.formation-tag {
  font-family: var(--font-mono);
  font-size: 0.75rem;
  color: var(--accent-copper);
  text-transform: uppercase;
  letter-spacing: 0.06em;
  padding-top: 3px;
}

.formation-body h3 {
  font-size: 1.12rem;
  font-weight: 700;
  color: var(--text-ink);
  margin-bottom: 6px;
}

.formation-body p {
  font-size: 0.92rem;
  color: var(--text-stone);
  max-width: 62ch;
  line-height: 1.55;
  margin-bottom: 0;
}

.formation-proof {
  padding: 12px 16px;
  background: var(--bg-sand);
  border-left: 3px solid var(--accent-copper);
  font-size: 0.84rem;
  color: var(--text-ink);
  margin-top: 12px;
}

.formation-proof strong {
  font-family: var(--font-mono);
  font-size: 0.76rem;
  text-transform: uppercase;
  color: var(--accent-copper);
  margin-right: 6px;
}

/* ==========================================================================
   Capítulo 05: Contacto & Selector de Consulta (Fondo Tinta)
   ========================================================================== */

.contact-grid {
  display: grid;
  grid-template-columns: 1.15fr 0.85fr;
}

.contact-builder {
  padding: 40px 44px;
  border-right: 1px solid var(--border-dark);
  display: flex;
  flex-direction: column;
  gap: 22px;
}

.builder-label {
  font-family: var(--font-mono);
  font-size: 0.76rem;
  text-transform: uppercase;
  letter-spacing: 0.08em;
  color: var(--accent-copper-light);
}

.topic-chips {
  display: flex;
  flex-wrap: wrap;
  gap: 10px;
}

.topic-chip {
  min-height: 44px;
  padding: 0 18px;
  background: var(--bg-graphite);
  border: 1px solid var(--border-dark-strong);
  color: var(--text-ash);
  font-family: var(--font-sans);
  font-size: 0.88rem;
  font-weight: 500;
  cursor: pointer;
  transition: all 0.2s ease;
}

.topic-chip:hover {
  border-color: var(--text-ivory);
  color: var(--text-ivory);
}

.topic-chip.is-selected {
  background: rgba(41, 110, 180, 0.22);
  border-color: var(--accent-copper);
  color: var(--text-ivory);
}

.message-preview-box {
  background: var(--bg-graphite);
  border: 1px solid var(--border-dark);
  padding: 24px;
  display: flex;
  flex-direction: column;
  gap: 14px;
}

.preview-meta {
  font-family: var(--font-mono);
  font-size: 0.76rem;
  color: var(--text-muted-dark);
  padding-bottom: 10px;
  border-bottom: 1px solid var(--border-dark);
}

.preview-meta span {
  color: var(--text-ivory);
}

.message-textarea {
  width: 100%;
  min-height: 110px;
  background: var(--bg-ink);
  border: 1px solid var(--border-dark-strong);
  color: var(--text-ivory);
  font-family: var(--font-sans);
  font-size: 0.95rem;
  line-height: 1.6;
  padding: 14px 16px;
  resize: vertical;
}

.contact-actions-row {
  display: flex;
  flex-wrap: wrap;
  gap: 14px;
  align-items: center;
}

.copy-feedback {
  font-family: var(--font-mono);
  font-size: 0.78rem;
  color: var(--accent-forest-light);
  opacity: 0;
  transition: opacity 0.2s ease;
}

.copy-feedback.is-visible {
  opacity: 1;
}

.contact-channels {
  padding: 40px 44px;
  background: var(--bg-graphite);
  display: flex;
  flex-direction: column;
  justify-content: flex-start;
  gap: 32px;
}

.channel-block {
  display: flex;
  flex-direction: column;
  gap: 10px;
  padding-bottom: 28px;
  border-bottom: 1px solid var(--border-dark);
}

.channel-block:last-child {
  border-bottom: none;
  padding-bottom: 0;
}

.channel-tag {
  font-family: var(--font-mono);
  font-size: 0.72rem;
  text-transform: uppercase;
  letter-spacing: 0.08em;
  color: var(--text-muted-dark);
}

.channel-title {
  font-size: 1.15rem;
  font-weight: 700;
  color: var(--text-ivory);
}

.channel-desc {
  font-size: 0.88rem;
  color: var(--text-ash);
  line-height: 1.6;
}

.channel-link {
  display: inline-flex;
  align-items: center;
  gap: 8px;
  font-family: var(--font-mono);
  font-size: 0.85rem;
  color: var(--accent-copper-light);
  text-decoration: none;
  margin-top: 4px;
  min-height: 44px;
}

.channel-link:hover {
  text-decoration: underline;
}

/* ==========================================================================
   Pie de Página Editorial (Footer)
   ========================================================================== */

.site-footer {
  background: var(--bg-ink);
  color: var(--text-muted-dark);
  border-top: 1px solid var(--border-dark);
  padding: 36px 0;
  font-family: var(--font-mono);
  font-size: 0.76rem;
}

.footer-inner {
  display: flex;
  flex-wrap: wrap;
  align-items: center;
  justify-content: space-between;
  gap: 16px;
}

.footer-inner a {
  color: var(--text-ash);
  text-decoration: none;
}

.footer-inner a:hover {
  color: var(--text-ivory);
}

/* ==========================================================================
   Adaptación Responsiva (Matriz 1280 / 1024 / 768 / 390 / 320 px)
   ========================================================================== */

@media (max-width: 1120px) {
  .hero-grid {
    grid-template-columns: 1fr;
  }
  .hero-main {
    border-right: none;
    border-bottom: 1px solid var(--border-dark);
    padding: 56px 36px;
  }
  .hero-visual-frame {
    aspect-ratio: 16 / 9;
  }
  .hero-ledger {
    grid-template-columns: repeat(2, 1fr);
  }
  .ledger-item:nth-child(2) {
    border-right: none;
  }
  .ledger-item:nth-child(-n+2) {
    border-bottom: 1px solid var(--border-dark);
  }
  .chapter-grid {
    grid-template-columns: 1fr;
  }
  .chapter-sidebar {
    border-right: none;
    border-bottom: 1px solid var(--border-light);
    padding: 40px 36px;
  }
  .theme-ink .chapter-sidebar {
    border-bottom-color: var(--border-dark);
  }
  .chapter-sticky {
    position: static;
  }
  .systems-tabs {
    grid-template-columns: 1fr;
  }
  .system-tab {
    border-right: none;
    border-bottom: 1px solid var(--border-dark);
    min-height: 60px;
    padding: 16px 24px;
  }
  .system-layers {
    grid-template-columns: 1fr;
  }
  .layer-card {
    border-right: none;
    border-bottom: 1px solid var(--border-dark);
  }
  .boit-pillars {
    grid-template-columns: 1fr;
  }
  .boit-pillar {
    border-right: none;
    border-bottom: 1px solid var(--border-light);
  }
  .contact-grid {
    grid-template-columns: 1fr;
  }
  .contact-builder {
    border-right: none;
    border-bottom: 1px solid var(--border-dark);
  }
}

@media (max-width: 860px) {
  .nav-desktop,
  .link-boit-header {
    display: none;
  }
  .menu-toggle {
    display: inline-flex;
  }
  .container,
  .header-inner {
    padding: 0 20px;
  }
  .practice-matrix {
    grid-template-columns: 1fr;
  }
  .practice-cell {
    border-right: none;
    border-bottom: 1px solid var(--border-light);
    padding: 32px 24px;
  }
  .practice-cell:last-child {
    border-bottom: none;
  }
  .chapter-intro,
  .system-header,
  .blueprint-container,
  .system-footer,
  .archive-block,
  .contact-builder,
  .contact-channels {
    padding-left: 24px;
    padding-right: 24px;
  }
  .boit-banner {
    margin: 0 24px 36px;
    padding: 28px 24px;
  }
  .archive-row {
    grid-template-columns: 1fr;
    gap: 8px;
  }
  .archive-tech {
    text-align: left;
  }
  .formation-item {
    grid-template-columns: 1fr;
    gap: 12px;
    padding: 32px 24px;
  }
}

@media (max-width: 520px) {
  .hero-main {
    padding: 40px 20px;
  }
  .hero-dossier {
    padding: 24px 20px;
  }
  .dossier-row {
    grid-template-columns: 1fr;
    gap: 4px;
  }
  .hero-ledger {
    grid-template-columns: 1fr;
  }
  .ledger-item {
    border-right: none;
    border-bottom: 1px solid var(--border-dark);
    padding: 20px;
  }
  .ledger-item:last-child {
    border-bottom: none;
  }
  .hero-ctas {
    flex-direction: column;
  }
  .hero-ctas .btn-primary,
  .hero-ctas .btn-secondary {
    width: 100%;
    justify-content: center;
  }
}

/* ==========================================================================
   Barra Flotante de Cambio de Propuesta (Comparador 1 · 2 · 3)
   ========================================================================== */

.design-switcher {
  position: fixed;
  bottom: 20px;
  right: 20px;
  z-index: 999;
  background: rgba(13, 27, 42, 0.94);
  backdrop-filter: blur(12px);
  border: 1px solid var(--border-dark-strong);
  border-radius: 999px;
  padding: 6px 8px;
  display: flex;
  align-items: center;
  gap: 4px;
  box-shadow: 0 12px 32px rgba(13, 27, 42, 0.45);
}

.switcher-label {
  font-family: var(--font-mono);
  font-size: 0.68rem;
  text-transform: uppercase;
  letter-spacing: 0.06em;
  color: var(--text-ash);
  padding: 0 10px 0 8px;
}

.switcher-link {
  font-family: var(--font-sans);
  font-size: 0.78rem;
  font-weight: 600;
  color: var(--text-ash);
  text-decoration: none;
  padding: 7px 14px;
  border-radius: 999px;
  transition: all 0.2s ease;
}

.switcher-link:hover {
  color: var(--text-ivory);
  background: rgba(255, 255, 255, 0.08);
}

.switcher-link.is-current {
  background: var(--accent-copper);
  color: var(--text-ivory);
}