/* ============================================================
   styles.css — Modelos Políticos Interactivos
   elcerebrohabla.com — Sistema de diseño unificado
   ============================================================ */


/* === VARIABLES CSS === */

:root {
  /* Paleta principal — modo claro */
  --color-brand:   #7a1316;   /* vino oscuro — acentos, links, CTAs */
  --color-accent:  #2ea3f2;   /* azul — blockquotes, hover, highlights */
  --color-text:    #191919;   /* cuerpo del texto */
  --color-heading: #000000;   /* encabezados */
  --color-meta:    #666666;   /* metadata, labels secundarios */
  --color-border:  #d9d3c8;   /* divisores, bordes de tabla */
  --color-bg:      #f2ede6;   /* fondo crema */

  /* Tarjetas (blancas sobre crema) */
  --color-card-bg:      #ffffff;
  --color-card-bg-dark: #1c1c1c;
  --color-brand-border: #c4bdb5;

  /* Paleta modo oscuro (valores de referencia) */
  --color-brand-dark:   #c9454a;
  --color-accent-dark:  #4fb8f7;
  --color-text-dark:    #e8e8e8;
  --color-heading-dark: #ffffff;
  --color-meta-dark:    #999999;
  --color-border-dark:  #333333;
  --color-bg-dark:      #111111;
}


/* === MODO OSCURO === */

[data-theme="dark"] {
  --color-brand:   var(--color-brand-dark);
  --color-accent:  var(--color-accent-dark);
  --color-text:    var(--color-text-dark);
  --color-heading: var(--color-heading-dark);
  --color-meta:    var(--color-meta-dark);
  --color-border:  var(--color-border-dark);
  --color-bg:      var(--color-bg-dark);
  --color-card-bg: var(--color-card-bg-dark);
}

[data-theme="dark"] .modelo-conclusion {
  background: rgba(201, 69, 74, 0.08);
  color: var(--color-text);
}

[data-theme="dark"] .simulador-container {
  background: var(--color-bg);
  border-color: var(--color-border);
}

[data-theme="dark"] blockquote {
  color: var(--color-text);
}

[data-theme="dark"] .seccion-card:hover {
  box-shadow: 0 12px 32px rgba(0,0,0,.3), 0 2px 8px rgba(0,0,0,.2);
}


/* === RESET Y BASE === */

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

html {
  scroll-behavior: smooth;
}

body {
  font-family: 'Open Sans', Arial, sans-serif;
  font-size: 17px;
  line-height: 1.75;
  color: var(--color-text);
  background-color: var(--color-bg);
  transition: background-color 0.2s ease, color 0.2s ease;
}

h1,
h2,
h3 {
  font-family: 'Francois One', sans-serif;
  color: var(--color-heading);
}

h1 { font-size: 32px; }
h2 { font-size: 26px; }
h3 { font-size: 20px; }

h4,
h5,
h6 {
  font-family: 'Open Sans', Arial, sans-serif;
  color: var(--color-heading);
}

p {
  margin-bottom: 1rem;
}

p:last-child {
  margin-bottom: 0;
}

blockquote {
  font-family: 'Crimson Text', serif;
  font-style: italic;
  border-left: 5px solid var(--color-accent);
  padding-left: 20px;
  color: var(--color-text);
  margin: 1.5rem 0;
}

a {
  color: var(--color-brand);
  text-decoration: none;
}

a:hover {
  color: var(--color-accent);
}

img {
  max-width: 100%;
  height: auto;
  display: block;
}

ul,
ol {
  padding-left: 1.5rem;
}

/* === LAYOUT === */

.container {
  max-width: 1080px;
  margin: 0 auto;
  padding: 40px 24px;
}


/* === HEADER DEL SITIO === */

.site-header {
  position: sticky;
  top: 0;
  z-index: 100;
  background: var(--color-bg);
  border-bottom: 2px solid var(--color-brand);
  height: 64px;
  display: flex;
  align-items: center;
  justify-content: space-between;
  padding: 0 24px;
  transition: background-color 0.2s ease, border-color 0.2s ease;
}

.nav-logo {
  display: flex;
  align-items: center;
  flex-shrink: 0;
}

.nav-logo img {
  max-height: 48px;
  width: auto;
}

.nav-links {
  display: none;
}

.nav-links a {
  color: var(--color-text);
  font-size: 14px;
  font-family: 'Open Sans', Arial, sans-serif;
  transition: color 0.2s ease;
}

.nav-links a:hover {
  color: var(--color-brand);
}

.nav-toggle-dark {
  margin-left: auto;
  margin-right: 16px;
  border: 1px solid var(--color-border);
  background: transparent;
  color: var(--color-text);
  font-family: 'Open Sans', Arial, sans-serif;
  font-size: 13px;
  padding: 4px 10px;
  cursor: pointer;
  transition: border-color 0.2s ease, color 0.2s ease;
  line-height: 1.4;
}

.nav-toggle-dark:hover {
  border-color: var(--color-brand);
  color: var(--color-brand);
}

.nav-hamburger {
  display: block;
  background: transparent;
  border: none;
  cursor: pointer;
  color: var(--color-text);
  padding: 4px 6px;
  font-size: 22px;
  line-height: 1;
  flex-shrink: 0;
  transition: color 0.2s ease;
}

.nav-hamburger:hover {
  color: var(--color-brand);
}


/* Menú móvil desplegable */
.nav-mobile-panel {
  display: none;
  position: absolute;
  top: 64px;
  left: 0;
  right: 0;
  background: var(--color-bg);
  border-bottom: 1px solid var(--color-border);
  padding: 16px 24px 20px;
  z-index: 99;
  flex-direction: column;
  gap: 0;
  transition: background-color 0.2s ease;
}

.nav-mobile-panel a {
  display: block;
  color: var(--color-text);
  font-family: 'Open Sans', Arial, sans-serif;
  font-size: 16px;
  padding: 12px 0;
  border-bottom: 1px solid var(--color-border);
  transition: color 0.2s ease;
}

.nav-mobile-panel a:last-child {
  border-bottom: none;
}

.nav-mobile-panel a:hover,
.nav-mobile-panel a.nav-active {
  color: var(--color-brand);
}

.site-header.nav-open .nav-mobile-panel {
  display: flex;
}


/* === HERO === */

.hero {
  padding: 72px 24px 56px;
  text-align: left;
  border-bottom: 1px solid var(--color-border);
}

.hero-title {
  font-family: 'Crimson Text', serif;
  font-size: 72px;
  font-weight: 600;
  font-style: italic;
  color: var(--color-heading);
  line-height: 1.0;
  max-width: 700px;
}

.hero-tag {
  display: block;
  font-size: 11px;
  letter-spacing: .14em;
  text-transform: uppercase;
  color: var(--color-brand);
  font-family: 'Open Sans', sans-serif;
  font-weight: 600;
  margin-bottom: 16px;
}

.hero-rule {
  width: 48px;
  height: 3px;
  background: var(--color-brand);
  margin: 16px 0 20px;
}

.hero-subtitle {
  font-size: 20px;
  color: var(--color-meta);
  margin-top: 12px;
  text-align: left;
}

.hero-desc {
  max-width: 600px;
  margin: 24px 0 0;
  font-size: 16px;
  line-height: 1.7;
  color: var(--color-text);
  text-align: left;
}


/* === HERO LAYOUT (two-column) === */

.hero-inner {
  display: flex;
  align-items: center;
  gap: 48px;
}
.hero-content {
  flex: 1;
  min-width: 0;
}
.hero-visual {
  flex-shrink: 0;
  width: 220px;
  display: flex;
  align-items: center;
  justify-content: center;
}

/* Brain SVG */
.brain-svg {
  width: 100%;
  overflow: visible;
}
.brain-outer {
  fill: none;
  stroke: var(--color-brand);
  stroke-width: 1.8;
  stroke-linejoin: round;
  stroke-linecap: round;
  opacity: 0.8;
}
.brain-fissure {
  fill: none;
  stroke: var(--color-brand);
  stroke-width: 1.2;
  stroke-linecap: round;
  opacity: 0.5;
}
.brain-gyrus {
  fill: none;
  stroke: var(--color-brand);
  stroke-width: 1;
  stroke-linecap: round;
  opacity: 0.4;
}
.synapse {
  stroke: var(--color-accent);
  stroke-width: 1;
  stroke-linecap: round;
  stroke-dasharray: 6 4;
  opacity: 0.55;
}
.s1  { animation: syn-flow 2.4s linear infinite 0.0s; }
.s2  { animation: syn-flow 3.0s linear infinite 0.4s; }
.s3  { animation: syn-flow 2.7s linear infinite 0.2s; }
.s4  { animation: syn-flow 2.2s linear infinite 0.8s; }
.s5  { animation: syn-flow 3.2s linear infinite 0.6s; }
.s6  { animation: syn-flow 2.6s linear infinite 1.0s; }
.s7  { animation: syn-flow 2.9s linear infinite 0.3s; }
.s8  { animation: syn-flow 3.5s linear infinite 0.7s; }
.s9  { animation: syn-flow 2.3s linear infinite 1.1s; }
.s10 { animation: syn-flow 3.1s linear infinite 0.5s; }
.neuron {
  fill: var(--color-accent);
  transform-box: fill-box;
  transform-origin: center;
}
.n1 { animation: neuron-fire 2.8s ease-in-out infinite 0.0s; }
.n2 { animation: neuron-fire 3.2s ease-in-out infinite 0.5s; }
.n3 { animation: neuron-fire 2.4s ease-in-out infinite 0.9s; }
.n4 { animation: neuron-fire 3.6s ease-in-out infinite 0.3s; }
.n5 { animation: neuron-fire 2.0s ease-in-out infinite 0.7s; }
.n6 { animation: neuron-fire 3.0s ease-in-out infinite 1.1s; }
.n7 { animation: neuron-fire 2.6s ease-in-out infinite 0.4s; }
.data-in {
  fill: var(--color-brand);
  opacity: 0.65;
}
.d1 { animation: data-pulse 2.5s ease-in-out infinite 0.0s; }
.d2 { animation: data-pulse 3.0s ease-in-out infinite 0.6s; }
.d3 { animation: data-pulse 2.2s ease-in-out infinite 1.2s; }
.d4 { animation: data-pulse 3.4s ease-in-out infinite 0.3s; }
.data-wire {
  stroke: var(--color-brand);
  stroke-width: 0.8;
  stroke-linecap: round;
  stroke-dasharray: 3 5;
  opacity: 0.3;
  animation: syn-flow-rev 3.5s linear infinite;
}
/* Brain breathing */
.brain-group {
  transform-box: fill-box;
  transform-origin: center;
  animation: brain-breathe 4s ease-in-out infinite;
}

/* Traveling data packets */
.packet {
  fill: var(--color-accent);
  opacity: 0;
}

/* Floating particles */
.particle {
  fill: var(--color-accent);
  opacity: 0;
}
.p-a { animation: float-particle 3.5s ease-in-out infinite 0.0s; }
.p-b { animation: float-particle 4.2s ease-in-out infinite 1.0s; }
.p-c { animation: float-particle 3.8s ease-in-out infinite 1.8s; }
.p-d { animation: float-particle 4.6s ease-in-out infinite 0.6s; }

/* Hero title brand span */
.hero-title-brand {
  color: var(--color-brand);
}

@keyframes syn-flow     { to { stroke-dashoffset: -30; } }
@keyframes syn-flow-rev { to { stroke-dashoffset:  24; } }
@keyframes brain-breathe {
  0%, 100% { transform: scale(1); }
  50%      { transform: scale(1.025); }
}
@keyframes neuron-fire {
  0%, 100% { opacity: 0.9; transform: scale(1); }
  30%      { opacity: 1;    transform: scale(1.5); }
  50%      { opacity: 0.15; transform: scale(0.3); }
  80%      { opacity: 0.9;  transform: scale(1.1); }
}
@keyframes data-pulse {
  0%, 100% { opacity: 0.65; }
  50%      { opacity: 0.12; }
}
@keyframes float-particle {
  0%   { opacity: 0;   transform: translateY(0); }
  20%  { opacity: 0.5; }
  50%  { opacity: 0.4; transform: translateY(-10px); }
  80%  { opacity: 0.5; }
  100% { opacity: 0;   transform: translateY(0); }
}

/* === GRID DE SECCIONES === */

.secciones-grid {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 24px;
  margin-top: 48px;
}

.secciones-label {
  display: flex;
  align-items: center;
  gap: 16px;
  margin-bottom: 20px;
}

.secciones-label-text {
  font-size: 11px;
  letter-spacing: .14em;
  text-transform: uppercase;
  color: var(--color-brand);
  font-family: 'Open Sans', sans-serif;
  font-weight: 600;
  white-space: nowrap;
}

.secciones-label-line {
  flex: 1;
  height: 1px;
  background: var(--color-border);
}

.seccion-card {
  background: var(--color-card-bg);
  border: 1px solid var(--color-border);
  border-radius: 4px;
  padding: 24px 22px 20px;
  position: relative;
  overflow: hidden;
  transition: transform .22s cubic-bezier(.22,.68,0,1.1),
              box-shadow .22s ease,
              border-color .22s ease;
}

.seccion-card::after {
  content: '';
  position: absolute;
  bottom: 0; left: 0; right: 0;
  height: 3px;
  background: var(--color-brand);
  transform: scaleX(0);
  transform-origin: left;
  transition: transform .28s cubic-bezier(.22,.68,0,1.1);
}

.seccion-card:hover {
  transform: translateY(-5px);
  box-shadow: 0 12px 32px rgba(0,0,0,.1), 0 2px 8px rgba(0,0,0,.06);
  border-color: var(--color-brand-border);
}

.seccion-card:hover::after {
  transform: scaleX(1);
}

.seccion-card--proximamente {
  opacity: 0.65;
  cursor: default;
  pointer-events: none;
}

.seccion-card--proximamente:hover {
  transform: none;
  box-shadow: none;
  border-color: var(--color-border);
}

.seccion-card--proximamente::after {
  display: none;
}

.seccion-card--fullwidth {
  grid-column: 1 / -1;
  display: flex;
  align-items: center;
  gap: 24px;
  pointer-events: auto;
}

.seccion-card--fullwidth .seccion-card-count {
  margin-left: auto;
  border-top: none;
  padding-top: 0;
  border-left: 1px solid var(--color-border);
  padding-left: 20px;
  flex-shrink: 0;
}

.seccion-card-num {
  font-size: 11px;
  letter-spacing: .14em;
  text-transform: uppercase;
  color: var(--color-brand);
  font-family: 'Open Sans', sans-serif;
  font-weight: 600;
  margin-bottom: 6px;
}

.seccion-card-title {
  font-family: 'Crimson Text', serif;
  font-size: 20px;
  font-weight: 600;
  font-style: italic;
  color: var(--color-heading);
  line-height: 1.2;
  margin-bottom: 8px;
}

.seccion-card-desc {
  font-size: 14px;
  color: var(--color-meta);
  margin-top: 0;
  line-height: 1.55;
}

.seccion-card-count {
  font-size: 11px;
  color: var(--color-brand);
  font-family: 'Open Sans', sans-serif;
  font-weight: 600;
  padding-top: 12px;
  border-top: 1px solid var(--color-border);
  margin-top: auto;
}

.seccion-card-icon {
  width: 36px;
  height: 36px;
  color: var(--color-brand);
  margin-bottom: 4px;
  display: block;
}

.seccion-card--proximamente .seccion-card-icon {
  color: var(--color-meta);
}

.seccion-card-badge {
  display: inline-block;
  font-size: 9px;
  background: #ede8e0;
  color: var(--color-meta);
  text-transform: uppercase;
  letter-spacing: .10em;
  padding: 2px 7px;
  border-radius: 2px;
  margin-bottom: 8px;
  font-family: 'Open Sans', sans-serif;
}


/* === SECCIONES Y MODELOS === */

.seccion {
  padding: 60px 0;
}

.seccion-header {
  margin-bottom: 40px;
  padding-bottom: 24px;
  border-bottom: 1px solid var(--color-border);
}

.seccion-intro {
  font-family: 'Crimson Text', serif;
  font-style: italic;
  font-size: 18px;
  color: var(--color-meta);
  margin-top: 8px;
  margin-bottom: 0;
}

.modelo-card {
  margin-bottom: 64px;
  padding: 32px;
  border-left: 4px solid var(--color-brand);
  background: var(--color-bg);
  border-top: 1px solid var(--color-border);
  border-right: 1px solid var(--color-border);
  border-bottom: 1px solid var(--color-border);
}

.modelo-card-header {
  display: flex;
  align-items: center;
  gap: 16px;
  margin-bottom: 20px;
}

.modelo-icon {
  width: 40px;
  height: 40px;
  flex-shrink: 0;
  color: var(--color-brand);
}

.modelo-contexto {
  font-family: 'Crimson Text', serif;
  font-style: italic;
  font-size: 19px;
  color: var(--color-meta);
  margin-bottom: 24px;
  line-height: 1.7;
}

.modelo-conclusion {
  font-size: 15px;
  margin-top: 24px;
  padding: 16px;
  background: rgba(122, 19, 22, 0.04);
  line-height: 1.6;
  color: var(--color-text);
}

.fuentes-pie {
  font-size: 13px;
  color: var(--color-meta);
  margin-top: 20px;
  padding-top: 12px;
  border-top: 1px solid var(--color-border);
  line-height: 1.5;
}


/* === SIMULADORES === */

.simulador-container {
  padding: 28px;
  border: 1px solid var(--color-border);
  margin: 24px 0;
  background: var(--color-bg);
}

.sim-controls {
  display: flex;
  flex-wrap: wrap;
  gap: 20px;
  margin-bottom: 20px;
}

.sim-control-group {
  display: flex;
  flex-direction: column;
  gap: 6px;
  min-width: 200px;
}

.sim-label {
  font-size: 13px;
  color: var(--color-meta);
  font-family: 'Open Sans', Arial, sans-serif;
}

.sim-value {
  font-family: 'Francois One', sans-serif;
  font-size: 22px;
  color: var(--color-brand);
  line-height: 1.2;
}

.sim-output {
  padding: 20px;
  background: rgba(122, 19, 22, 0.03);
  margin-top: 16px;
}

.sim-output-title {
  font-size: 11px;
  color: var(--color-meta);
  text-transform: uppercase;
  letter-spacing: 0.08em;
  margin-bottom: 8px;
  font-family: 'Open Sans', Arial, sans-serif;
}

.sim-result {
  font-family: 'Francois One', sans-serif;
  font-size: 30px;
  color: var(--color-brand);
  line-height: 1.2;
}

.sim-explanation {
  font-size: 14px;
  color: var(--color-text);
  margin-top: 8px;
  line-height: 1.6;
}

.sim-transicion {
  font-family: 'Crimson Text', serif;
  font-style: italic;
  font-size: 15px;
  color: var(--color-meta);
  margin: 16px 0;
}

.sim-alert {
  border-left: 4px solid var(--color-accent);
  padding: 12px 16px;
  font-size: 14px;
  margin-top: 16px;
  background: rgba(46, 163, 242, 0.05);
  color: var(--color-text);
  line-height: 1.6;
}

.sim-alert--warning {
  border-color: var(--color-accent);
  color: var(--color-text);
  background: transparent;
}

input[type="range"] {
  accent-color: var(--color-brand);
  width: 100%;
  height: 6px;
  cursor: pointer;
  display: block;
}

.sim-pares-grid {
  display: grid;
  grid-template-columns: repeat(auto-fill, minmax(280px, 1fr));
  gap: 16px;
}

.sim-par-card {
  padding: 16px;
  border: 1px solid var(--color-border);
  display: flex;
  flex-direction: column;
  gap: 12px;
  background: var(--color-bg);
}

.sim-par-opciones {
  display: flex;
  gap: 8px;
}

.sim-par-opciones button {
  flex: 1;
  padding: 8px;
  min-height: 44px;
  font-size: 14px;
  cursor: pointer;
  border: 1px solid var(--color-border);
  background: transparent;
  color: var(--color-text);
  font-family: 'Open Sans', Arial, sans-serif;
  transition: all 0.2s ease;
}

.sim-par-opciones button:hover {
  border-color: var(--color-brand);
  color: var(--color-brand);
}

.sim-par-opciones button.selected {
  background: var(--color-brand);
  color: #ffffff;
  border-color: var(--color-brand);
}

.sim-bar-container {
  display: flex;
  gap: 12px;
  align-items: flex-end;
  height: 80px;
  margin-top: 16px;
}

.sim-bar {
  min-width: 40px;
  transition: height 0.3s ease;
  display: flex;
  align-items: flex-end;
  justify-content: center;
}


/* === BOTONES === */

.btn {
  border: 2px solid var(--color-brand);
  color: var(--color-brand);
  padding: 0.35em 1.1em;
  background: transparent;
  font-family: 'Open Sans', Arial, sans-serif;
  font-size: 14px;
  cursor: pointer;
  transition: all 0.2s ease;
  display: inline-block;
  line-height: 1.5;
}

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

.btn:focus {
  outline: 2px solid var(--color-accent);
  outline-offset: 2px;
}

.btn--accent {
  border-color: var(--color-accent);
  color: var(--color-accent);
}

.btn--accent:hover {
  background: var(--color-accent);
  color: #ffffff;
}


/* === CTAs DE MARCA === */

.cta-seccion {
  padding: 24px 28px;
  border: 1px solid var(--color-border);
  margin-top: 48px;
  border-left: 4px solid var(--color-accent);
  background: var(--color-bg);
}

.cta-seccion p {
  font-family: 'Crimson Text', serif;
  font-style: italic;
  font-size: 16px;
  line-height: 1.6;
  color: var(--color-text);
  margin-bottom: 0;
}

.cta-seccion a {
  color: var(--color-brand);
  font-style: normal;
}

.cta-seccion a:hover {
  color: var(--color-accent);
}


/* === NAVEGACIÓN ENTRE SECCIONES === */

.seccion-nav {
  max-width: 1080px;
  margin: 0 auto;
  padding: 32px 24px;
  display: flex;
  justify-content: space-between;
  align-items: stretch;
  gap: 12px;
}

.seccion-nav-prev,
.seccion-nav-next {
  display: inline-flex;
  align-items: center;
  gap: 12px;
  padding: 14px 20px;
  border: 1.5px solid var(--color-border);
  text-decoration: none;
  color: var(--color-text);
  max-width: 48%;
  transition: border-color .2s, color .2s;
}

.seccion-nav-prev:hover,
.seccion-nav-next:hover {
  border-color: var(--color-brand);
  color: var(--color-brand);
}

.seccion-nav-next {
  margin-left: auto;
  text-align: right;
}

.seccion-nav-arrow {
  font-size: 20px;
  flex-shrink: 0;
  color: var(--color-brand);
}

.seccion-nav-label {
  display: block;
  font-size: 11px;
  text-transform: uppercase;
  letter-spacing: .06em;
  color: var(--color-meta);
  margin-bottom: 3px;
  font-family: 'Open Sans', Arial, sans-serif;
}

.seccion-nav-title {
  display: block;
  font-size: 14px;
  font-weight: 600;
  font-family: 'Open Sans', Arial, sans-serif;
  line-height: 1.3;
}


/* === SHARE BAR === */

.share-bar {
  max-width: 1080px;
  margin: 0 auto;
  padding: 28px 24px;
  display: flex;
  align-items: center;
  gap: 20px;
  flex-wrap: wrap;
  border-top: 1px solid var(--color-border);
}

.share-bar-label {
  font-size: 13px;
  color: var(--color-meta);
  font-family: 'Open Sans', Arial, sans-serif;
  white-space: nowrap;
}

.share-bar-buttons {
  display: flex;
  gap: 8px;
  flex-wrap: wrap;
}

.share-btn {
  display: inline-flex;
  align-items: center;
  gap: 6px;
  padding: 5px 13px;
  font-size: 12px;
  font-family: 'Open Sans', Arial, sans-serif;
  border: 1.5px solid var(--color-border);
  color: var(--color-meta);
  cursor: pointer;
  background: transparent;
  text-decoration: none;
  transition: border-color .2s, color .2s;
  line-height: 1.5;
}

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

.share-btn svg {
  width: 14px;
  height: 14px;
  flex-shrink: 0;
}

/* === FOLLOW SECTION (solo index) === */

.follow-section {
  background: rgba(122,19,22,0.04);
  border-top: 1px solid var(--color-border);
  border-bottom: 1px solid var(--color-border);
  padding: 40px 24px;
  text-align: center;
  margin-top: 60px;
}

[data-theme="dark"] .follow-section {
  background: rgba(201,69,74,0.07);
}

.follow-inner {
  max-width: 680px;
  margin: 0 auto;
  display: flex;
  flex-direction: column;
  align-items: center;
  gap: 24px;
}

.follow-heading {
  font-family: 'Francois One', sans-serif;
  font-size: 22px;
  color: var(--color-heading);
  margin: 0;
}

.follow-sub {
  font-size: 14px;
  color: var(--color-meta);
  margin: 4px 0 0;
  line-height: 1.6;
}

.follow-links {
  display: flex;
  gap: 12px;
  flex-wrap: wrap;
  justify-content: center;
}

.follow-link {
  display: inline-flex;
  align-items: center;
  gap: 8px;
  padding: 9px 18px;
  font-size: 13px;
  font-family: 'Open Sans', Arial, sans-serif;
  font-weight: 600;
  border: 2px solid var(--color-brand);
  color: var(--color-brand);
  text-decoration: none;
  transition: background .2s, color .2s;
}

.follow-link:hover {
  background: var(--color-brand);
  color: #fff;
}

.follow-link svg {
  width: 16px;
  height: 16px;
  flex-shrink: 0;
}


/* === FOOTER === */

.site-footer {
  padding: 40px 0;
  border-top: 1px solid var(--color-border);
  margin-top: 80px;
}

.footer-inner {
  max-width: 1080px;
  margin: 0 auto;
  padding: 0 24px;
  display: flex;
  justify-content: space-between;
  align-items: center;
  flex-wrap: wrap;
  gap: 24px;
}

.footer-social {
  display: flex;
  gap: 20px;
  align-items: center;
}

.footer-social a {
  color: var(--color-meta);
  display: flex;
  align-items: center;
  transition: color 0.2s ease;
}

.footer-social a:hover {
  color: var(--color-brand);
}

.footer-social svg {
  width: 20px;
  height: 20px;
}

.footer-credits {
  font-size: 13px;
  color: var(--color-meta);
  line-height: 1.5;
}

.footer-credits a {
  color: var(--color-meta);
  text-decoration: underline;
}

.footer-credits a:hover {
  color: var(--color-brand);
}


/* === MEDIA QUERIES === */

/* Tablet: 768px */
@media (max-width: 768px) {
  .secciones-grid {
    grid-template-columns: repeat(2, 1fr);
  }

  .site-header {
    padding: 0 16px;
  }

  .hero {
    padding: 56px 20px 40px;
  }

  .hero-inner {
    flex-direction: column;
    gap: 28px;
  }
  .hero-visual {
    width: 160px;
  }

  .hero-title {
    font-size: 52px;
  }

  .modelo-card {
    padding: 24px 20px;
  }

  .simulador-container {
    padding: 20px 16px;
  }

  .footer-inner {
    flex-direction: column;
    text-align: center;
  }

  .footer-social {
    justify-content: center;
  }
}

/* Móvil: layout a 640px */
@media (max-width: 640px) {

  .hero-title {
    font-size: 42px;
  }
}

/* Móvil: 480px */
@media (max-width: 480px) {
  .container {
    padding: 20px;
  }

  .secciones-grid {
    grid-template-columns: 1fr;
    gap: 16px;
    margin-top: 32px;
  }

  .hero {
    padding: 48px 20px 32px;
  }

  .hero-visual {
    width: 120px;
  }

  .hero-title {
    font-size: 34px;
  }

  .hero-title {
    font-size: 32px;
  }

  .hero-subtitle {
    font-size: 17px;
  }

  .sim-controls {
    flex-direction: column;
    gap: 16px;
  }

  .sim-control-group {
    min-width: unset;
    width: 100%;
  }

  .site-header {
    padding: 0 16px;
    gap: 12px;
  }

  .nav-logo {
    flex: 1;
  }

  .nav-toggle-dark {
    flex-shrink: 0;
  }

  .modelo-card {
    padding: 20px 16px;
    margin-bottom: 40px;
  }

  .seccion {
    padding: 40px 0;
  }

  .seccion-header {
    margin-bottom: 28px;
  }

  .sim-pares-grid {
    grid-template-columns: 1fr;
  }

  .sim-result {
    font-size: 24px;
  }

  .site-footer {
    margin-top: 48px;
  }

  .footer-inner {
    flex-direction: column;
    text-align: center;
    gap: 16px;
  }

  .footer-social {
    justify-content: center;
  }
}


/* === SCROLL REVEAL === */

.reveal {
  opacity: 0;
  transform: translateY(20px);
  transition: opacity .55s ease, transform .55s cubic-bezier(.22,.68,0,1.1);
}

.reveal.visible {
  opacity: 1;
  transform: none;
}