/* ==========================================================================
   ZH Development SpA — hoja de estilos
   ---------------------------------------------------------------------------
   Dirección de arte: "Ruteo".
   El logo es una monolínea continua de esquinas blandas que entra por un lado
   y sale por el otro con un único quiebre azul. Ese trazo es el sistema: rieles
   de 1px que estructuran la página, nodos cuadrados de esquina suave como
   marcadores, y el azul eléctrico usado siempre como señal, nunca como relleno.
   Cero degradados decorativos. El vacío es una columna vacía a propósito, no
   contenido faltante.
   ========================================================================== */

/* --------------------------------------------------------------------------
   1. Tipografía auto-hospedada (SIL OFL 1.1 — ver fonts/LICENSE.md)
   Subconjunto latino únicamente. Sin CDN ni peticiones a terceros.
   -------------------------------------------------------------------------- */

@font-face {
  font-family: "Inter Tight";
  font-style: normal;
  font-weight: 500 700;
  font-display: swap;
  src: url("fonts/inter-tight-latin.woff2") format("woff2");
  unicode-range: U+0000-00FF, U+0131, U+0152-0153, U+02BB-02BC, U+02C6, U+02DA,
                 U+02DC, U+0304, U+0308, U+0329, U+2000-206F, U+20AC, U+2122,
                 U+2191, U+2193, U+2212, U+2215, U+FEFF, U+FFFD;
}

@font-face {
  font-family: "Inter Var";
  font-style: normal;
  font-weight: 400 600;
  font-display: swap;
  src: url("fonts/inter-latin.woff2") format("woff2");
  unicode-range: U+0000-00FF, U+0131, U+0152-0153, U+02BB-02BC, U+02C6, U+02DA,
                 U+02DC, U+0304, U+0308, U+0329, U+2000-206F, U+20AC, U+2122,
                 U+2191, U+2193, U+2212, U+2215, U+FEFF, U+FFFD;
}

@font-face {
  font-family: "Plex Mono";
  font-style: normal;
  font-weight: 400;
  font-display: swap;
  src: url("fonts/plexmono-400-latin.woff2") format("woff2");
  unicode-range: U+0000-00FF, U+0131, U+0152-0153, U+02BB-02BC, U+02C6, U+02DA,
                 U+02DC, U+2000-206F, U+2122, U+2212, U+FEFF, U+FFFD;
}

@font-face {
  font-family: "Plex Mono";
  font-style: normal;
  font-weight: 500;
  font-display: swap;
  src: url("fonts/plexmono-500-latin.woff2") format("woff2");
  unicode-range: U+0000-00FF, U+0131, U+0152-0153, U+02BB-02BC, U+02C6, U+02DA,
                 U+02DC, U+2000-206F, U+2122, U+2212, U+FEFF, U+FFFD;
}

/* --------------------------------------------------------------------------
   2. Tokens
   -------------------------------------------------------------------------- */

:root {
  /* Tinta — muestreada del logo (#101A2D → #1B2A41) */
  --ink-950: #04080F;
  --ink-900: #070E1A;
  --ink-800: #0B1424;
  --ink-700: #101A2D;
  --ink-600: #1B2A41;

  /* Azul eléctrico — señal (#0A64FC del logo) */
  --blue-700: #0846B8;
  --blue-600: #0A54DC;
  --blue-500: #0B62F5;
  --blue-400: #3D82FF;
  --blue-300: #7FA8FF;
  --blue-050: #EDF3FF;

  /* Superficies */
  --paper: #FFFFFF;
  --paper-alt: #F6F8FC;
  --paper-sunk: #EEF2F8;
  --line: #E1E7F0;
  --line-strong: #C7D1E0;
  --line-dark: rgba(255, 255, 255, 0.11);
  --line-dark-strong: rgba(255, 255, 255, 0.2);

  /* Texto — cada tono verificado sobre su fondo (AA o mejor) */
  --text: #0F1A2C;
  --text-muted: #4E5A6E;
  --text-faint: #626C7B;
  --text-on-dark: #F2F5FA;
  --text-muted-on-dark: #A8B4C8;
  --text-faint-on-dark: #8593AA;

  --font-display: "Inter Tight", -apple-system, BlinkMacSystemFont, "Segoe UI",
                  Roboto, "Helvetica Neue", Arial, sans-serif;
  --font-sans: "Inter Var", -apple-system, BlinkMacSystemFont, "Segoe UI",
               Roboto, "Helvetica Neue", Arial, "Noto Sans", sans-serif;
  --font-mono: "Plex Mono", ui-monospace, SFMono-Regular, "SF Mono", Menlo,
               Consolas, "Liberation Mono", monospace;

  --shell: 1240px;
  --gutter: 26px;
  --header-h: 68px;

  /* Radios sobrios: esquina blanda, nunca píldora */
  --r-xs: 3px;
  --r-sm: 7px;
  --r-md: 11px;
  --r-lg: 18px;

  --shadow-sm: 0 1px 2px rgba(11, 20, 36, 0.06);
  --shadow-md: 0 12px 32px -14px rgba(11, 20, 36, 0.26);
  --shadow-lg: 0 28px 70px -24px rgba(4, 8, 15, 0.45);

  --ease: cubic-bezier(0.22, 0.68, 0.28, 1);
  --dur: 0.22s;
}

/* --------------------------------------------------------------------------
   3. Base
   -------------------------------------------------------------------------- */

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

html {
  scroll-behavior: smooth;
  scroll-padding-top: calc(var(--header-h) + 20px);
  -webkit-text-size-adjust: 100%;
}

body {
  margin: 0;
  font-family: var(--font-sans);
  font-size: 16.5px;
  line-height: 1.62;
  color: var(--text);
  background: var(--paper);
  overflow-x: clip;
  -webkit-font-smoothing: antialiased;
  -moz-osx-font-smoothing: grayscale;
  font-synthesis-weight: none;
}

h1, h2, h3, h4, p, ul, ol, dl, dd, figure, figcaption { margin: 0; }
ul, ol { padding: 0; list-style: none; }
img, svg { display: block; max-width: 100%; }
a { color: inherit; text-decoration: none; }

button {
  font: inherit;
  color: inherit;
  background: none;
  border: 0;
  padding: 0;
  cursor: pointer;
}

h1, h2, h3 {
  font-family: var(--font-display);
  font-weight: 620;
  letter-spacing: -0.028em;
  line-height: 1.08;
  text-wrap: balance;
}

h2 { font-size: clamp(1.75rem, 1.2rem + 2vw, 2.65rem); }

h3 {
  font-size: 1.125rem;
  font-weight: 600;
  line-height: 1.3;
  letter-spacing: -0.017em;
}

p { text-wrap: pretty; }

/* Cifras siempre alineadas en columna */
.mono-label,
.ledger-num,
.track-ghost,
.closing-steps .mono-label { font-variant-numeric: tabular-nums; }

/* --------------------------------------------------------------------------
   4. Primitivas de layout
   -------------------------------------------------------------------------- */

.shell {
  width: 100%;
  max-width: var(--shell);
  margin-inline: auto;
  padding-inline: var(--gutter);
}

.section { padding-block: clamp(84px, 9vw, 140px); }

/* Rejilla de dos columnas asimétrica, el esqueleto de casi toda la página */
.split {
  display: grid;
  grid-template-columns: minmax(0, 1fr) minmax(0, 1fr);
  gap: clamp(44px, 5.5vw, 96px);
}

.split-sticky {
  grid-template-columns: minmax(0, 4.2fr) minmax(0, 7fr);
  border-top: 1px solid var(--line-strong);
  padding-top: clamp(30px, 3vw, 46px);
}
.split-ai { grid-template-columns: minmax(0, 6fr) minmax(0, 5.4fr); align-items: center; }
.split-about { grid-template-columns: minmax(0, 6.4fr) minmax(0, 5fr); align-items: start; }

.sticky-block { position: sticky; top: calc(var(--header-h) + 44px); }
.sticky-block .lead { margin-top: 20px; }

/* Encabezado de sección de dos columnas: título a la izquierda, bajada a la
   derecha. Rompe el patrón centrado y da ancho de lectura correcto. */
.section-head-wide {
  display: grid;
  grid-template-columns: minmax(0, 1fr) minmax(0, 1fr);
  gap: clamp(24px, 4vw, 80px);
  align-items: end;
  padding-bottom: clamp(40px, 4.5vw, 64px);
}

.section-head-wide h2 { max-width: 15ch; }

/* --------------------------------------------------------------------------
   5. Accesibilidad
   -------------------------------------------------------------------------- */

:focus-visible {
  outline: 2px solid var(--blue-500);
  outline-offset: 3px;
  border-radius: var(--r-xs);
}

.hero :focus-visible,
.ai :focus-visible,
.closing :focus-visible,
.site-footer :focus-visible { outline-color: var(--blue-300); }

.skip-link {
  position: fixed;
  top: 12px;
  left: 12px;
  z-index: 999;
  padding: 12px 18px;
  font-size: 0.9rem;
  font-weight: 600;
  color: var(--paper);
  background: var(--ink-800);
  border-radius: var(--r-sm);
  box-shadow: var(--shadow-lg);
  transform: translateY(calc(-100% - 24px));
  transition: transform var(--dur) var(--ease);
}

.skip-link:focus-visible { transform: translateY(0); }

/* --------------------------------------------------------------------------
   6. Tipografía de apoyo
   -------------------------------------------------------------------------- */

.mono-label {
  font-family: var(--font-mono);
  font-size: 0.685rem;
  font-weight: 500;
  letter-spacing: 0.15em;
  text-transform: uppercase;
}

.kicker {
  display: inline-flex;
  align-items: center;
  gap: 9px;
  margin-bottom: 22px;
  font-family: var(--font-mono);
  font-size: 0.695rem;
  font-weight: 500;
  letter-spacing: 0.17em;
  text-transform: uppercase;
  color: var(--blue-600);
}

.kicker::before {
  content: "";
  width: 18px;
  height: 1px;
  flex: none;
  background: currentColor;
}

.kicker-dark { color: var(--blue-300); }

/* Nodo vivo: la única animación permanente de la interfaz clara */
.kicker-dot {
  position: relative;
  width: 6px;
  height: 6px;
  flex: none;
  border-radius: 2px;
  background: var(--blue-400);
}

.kicker-dot::after {
  content: "";
  position: absolute;
  inset: -3px;
  border: 1px solid var(--blue-400);
  border-radius: 4px;
  opacity: 0;
  animation: ping 3.2s var(--ease) infinite;
}

@keyframes ping {
  0%   { opacity: 0.8; transform: scale(0.6); }
  70%  { opacity: 0;   transform: scale(1.5); }
  100% { opacity: 0;   transform: scale(1.5); }
}

.lead {
  font-size: 1.055rem;
  color: var(--text-muted);
  max-width: 46ch;
}

/* --------------------------------------------------------------------------
   7. Botones y enlaces de acción
   -------------------------------------------------------------------------- */

.btn {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  gap: 9px;
  padding: 11px 20px;
  border: 1px solid transparent;
  border-radius: var(--r-sm);
  font-family: var(--font-sans);
  font-size: 0.94rem;
  font-weight: 560;
  letter-spacing: -0.006em;
  text-align: center;
  transition: background-color var(--dur) var(--ease),
              border-color var(--dur) var(--ease),
              color var(--dur) var(--ease),
              box-shadow var(--dur) var(--ease),
              transform var(--dur) var(--ease);
}

.btn-sm { padding: 9px 15px; font-size: 0.875rem; }
.btn-lg { padding: 14px 24px; font-size: 1rem; }

.btn-arrow {
  width: 17px;
  height: 17px;
  flex: none;
  transition: transform var(--dur) var(--ease);
}

.btn:hover .btn-arrow { transform: translateX(3px); }

.btn-primary {
  background: var(--blue-500);
  border-color: var(--blue-500);
  color: #fff;
  box-shadow: var(--shadow-sm);
}

.btn-primary:hover {
  background: var(--blue-600);
  border-color: var(--blue-600);
  box-shadow: 0 10px 26px -12px rgba(11, 98, 245, 0.75);
}

.btn-primary:active { background: var(--blue-700); transform: translateY(1px); }

/* Fantasma: sólo borde, para acompañar sin competir */
.btn-ghost {
  background: transparent;
  border-color: var(--line-dark-strong);
  color: var(--text-on-dark);
}

.btn-ghost:hover {
  border-color: var(--blue-300);
  background: rgba(125, 165, 255, 0.08);
  color: #fff;
}

.btn-ghost:active { transform: translateY(1px); }

.link-arrow {
  display: inline-flex;
  align-items: center;
  gap: 9px;
  margin-top: 30px;
  font-weight: 560;
  font-size: 0.965rem;
  color: var(--blue-300);
  border-bottom: 1px solid rgba(127, 168, 255, 0.3);
  padding-bottom: 3px;
  transition: color var(--dur) var(--ease), border-color var(--dur) var(--ease);
}

.link-arrow svg { width: 18px; height: 18px; transition: transform var(--dur) var(--ease); }
.link-arrow:hover { color: #fff; border-bottom-color: var(--blue-400); }
.link-arrow:hover svg { transform: translateX(4px); }

.link-arrow-light {
  color: var(--blue-600);
  border-bottom-color: rgba(10, 84, 220, 0.28);
}

.link-arrow-light:hover { color: var(--blue-700); border-bottom-color: var(--blue-600); }

/* --------------------------------------------------------------------------
   8. Marca
   El PNG aporta sólo el monograma; el nombre se compone en CSS para que quede
   nítido a cualquier tamaño, sea seleccionable y lo lean los lectores.
   -------------------------------------------------------------------------- */

.brand {
  display: inline-flex;
  align-items: center;
  gap: 11px;
  border-radius: var(--r-sm);
}

.brand-mark {
  width: auto;
  height: 29px;
  flex: none;
  transition: transform var(--dur) var(--ease);
}

.brand:hover .brand-mark { transform: translateX(2px); }

/* El monograma tiene dos versiones; la cabecera elige según el fondo */
.brand-mark-light { display: none; }

.brand-text { display: flex; flex-direction: column; line-height: 1.1; }

.brand-name {
  font-family: var(--font-display);
  font-size: 0.94rem;
  font-weight: 640;
  letter-spacing: 0.055em;
  text-transform: uppercase;
  color: var(--ink-700);
}

.brand-tag {
  font-family: var(--font-mono);
  font-size: 0.58rem;
  font-weight: 400;
  letter-spacing: 0.2em;
  text-transform: uppercase;
  color: var(--text-faint);
  margin-top: 3px;
}

.brand-on-dark .brand-name { color: #fff; }
.brand-on-dark .brand-tag { color: var(--blue-300); }

/* --------------------------------------------------------------------------
   9. Header
   -------------------------------------------------------------------------- */

.site-header {
  position: fixed;
  top: 0;
  inset-inline: 0;
  z-index: 100;
  height: var(--header-h);
  background: rgba(255, 255, 255, 0.88);
  backdrop-filter: saturate(180%) blur(18px);
  -webkit-backdrop-filter: saturate(180%) blur(18px);
  border-bottom: 1px solid transparent;
  transition: border-color var(--dur) var(--ease),
              box-shadow var(--dur) var(--ease),
              background-color var(--dur) var(--ease);
}

.site-header.is-scrolled {
  border-bottom-color: var(--line);
  box-shadow: 0 8px 28px -22px rgba(11, 20, 36, 0.5);
}

/* En el tope de la página la cabecera desaparece: el hero se lee a sangre */
.site-header:not(.is-scrolled) {
  background: transparent;
  backdrop-filter: none;
  -webkit-backdrop-filter: none;
}

/* Inversión sobre superficies oscuras (hero, IA, cierre, pie).
   La cabecera nunca queda como una banda clara pegada sobre el navy. */
.site-header.is-dark.is-scrolled {
  background: rgba(7, 14, 26, 0.86);
  border-bottom-color: var(--line-dark);
  box-shadow: 0 10px 30px -24px rgba(0, 0, 0, 0.9);
}

.site-header.is-dark .brand-mark { display: none; }
.site-header.is-dark .brand-mark-light { display: block; }
.site-header.is-dark .brand-name { color: #fff; }
.site-header.is-dark .brand-tag { color: var(--blue-300); }

.site-header.is-dark .nav-list a { color: var(--text-muted-on-dark); }
.site-header.is-dark .nav-list a:hover,
.site-header.is-dark .nav-list a[aria-current="true"] { color: #fff; }
.site-header.is-dark .nav-list a span::after { background: var(--blue-400); }

.site-header.is-dark .nav-toggle {
  border-color: var(--line-dark-strong);
  background: rgba(255, 255, 255, 0.05);
}

.site-header.is-dark .nav-toggle:hover { background: rgba(255, 255, 255, 0.1); }
.site-header.is-dark .nav-toggle-bar { background: #fff; }
.site-header.is-dark :focus-visible { outline-color: var(--blue-300); }

/* Progreso de lectura: un hairline que crece en el borde inferior */
.scroll-progress {
  position: absolute;
  left: 0;
  bottom: -1px;
  width: 100%;
  height: 2px;
  background: var(--blue-500);
  transform: scaleX(var(--progress, 0));
  transform-origin: left center;
  opacity: 0;
  transition: opacity var(--dur) var(--ease);
}

.site-header.is-scrolled .scroll-progress { opacity: 1; }

.header-inner {
  height: var(--header-h);
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 20px;
}

.primary-nav {
  display: flex;
  align-items: center;
  gap: 28px;
}

.nav-list { display: flex; align-items: center; gap: 2px; }

.nav-list a {
  position: relative;
  display: block;
  padding: 9px 13px;
  border-radius: var(--r-sm);
  font-size: 0.92rem;
  font-weight: 500;
  color: var(--text-muted);
  transition: color var(--dur) var(--ease);
}

/* El subrayado se dibuja de izquierda a derecha: el mismo gesto del trazo */
.nav-list a span {
  position: relative;
  display: inline-block;
}

.nav-list a span::after {
  content: "";
  position: absolute;
  left: 0;
  right: 0;
  bottom: -5px;
  height: 1.5px;
  border-radius: 2px;
  background: var(--blue-500);
  transform: scaleX(0);
  transform-origin: left center;
  transition: transform var(--dur) var(--ease);
}

.nav-list a:hover { color: var(--text); }
.nav-list a:hover span::after { transform: scaleX(1); }

.nav-list a[aria-current="true"] { color: var(--text); font-weight: 560; }
.nav-list a[aria-current="true"] span::after { transform: scaleX(1); }

.nav-toggle {
  display: none;
  width: 42px;
  height: 42px;
  align-items: center;
  justify-content: center;
  border: 1px solid var(--line);
  border-radius: var(--r-sm);
  background: var(--paper);
  transition: border-color var(--dur) var(--ease), background-color var(--dur) var(--ease);
}

.nav-toggle:hover { border-color: var(--line-strong); background: var(--paper-alt); }

.nav-toggle-box {
  display: flex;
  flex-direction: column;
  justify-content: center;
  gap: 5px;
  width: 18px;
}

.nav-toggle-bar {
  display: block;
  height: 1.5px;
  width: 100%;
  border-radius: 2px;
  background: var(--ink-700);
  transition: transform var(--dur) var(--ease), width var(--dur) var(--ease);
}

.nav-toggle[aria-expanded="true"] .nav-toggle-bar:nth-child(1) { transform: translateY(3.25px) rotate(45deg); }
.nav-toggle[aria-expanded="true"] .nav-toggle-bar:nth-child(2) { transform: translateY(-3.25px) rotate(-45deg); }

/* --------------------------------------------------------------------------
   10. Campo de retícula (textura de las superficies oscuras)
   Hairlines enmascaradas, no degradados de color.
   -------------------------------------------------------------------------- */

.grid-field {
  position: absolute;
  inset: 0;
  z-index: -1;
  background-image:
    linear-gradient(to right, rgba(255, 255, 255, 0.05) 1px, transparent 1px),
    linear-gradient(to bottom, rgba(255, 255, 255, 0.05) 1px, transparent 1px);
  background-size: 76px 76px;
  background-position: center top;
  mask-image: radial-gradient(115% 85% at 72% 12%, #000 0%, transparent 76%);
  -webkit-mask-image: radial-gradient(115% 85% at 72% 12%, #000 0%, transparent 76%);
  pointer-events: none;
}

.grid-field-left {
  mask-image: radial-gradient(95% 80% at 18% 50%, #000 0%, transparent 74%);
  -webkit-mask-image: radial-gradient(95% 80% at 18% 50%, #000 0%, transparent 74%);
}

/* --------------------------------------------------------------------------
   11. Hero
   -------------------------------------------------------------------------- */

.hero {
  position: relative;
  isolation: isolate;
  overflow: hidden;
  background: var(--ink-900);
  color: var(--text-on-dark);
  padding-top: calc(var(--header-h) + clamp(56px, 6vw, 92px));
  padding-bottom: 0;
}

/* Un único haz azul: la señal que recorre el borde superior del escenario */
.hero-beam {
  position: absolute;
  top: 0;
  left: 12%;
  width: 46%;
  height: 1px;
  z-index: -1;
  background: linear-gradient(90deg, transparent, rgba(61, 130, 255, 0.85), transparent);
  pointer-events: none;
}

.hero-shell {
  display: flex;
  flex-direction: column;
  min-height: calc(100vh - var(--header-h) - clamp(56px, 6vw, 92px));
  min-height: calc(100svh - var(--header-h) - clamp(56px, 6vw, 92px));
}

.hero-main {
  display: grid;
  grid-template-columns: minmax(0, 6.6fr) minmax(0, 5fr);
  gap: clamp(44px, 5vw, 84px);
  align-items: center;
  flex: 1;
  padding-bottom: clamp(44px, 4.5vw, 68px);
}

.hero h1 { margin-bottom: 26px; }

.h1-lead {
  display: block;
  font-size: clamp(2.35rem, 1.35rem + 3.5vw, 4.05rem);
  font-weight: 640;
  line-height: 1.03;
  letter-spacing: -0.038em;
  color: #fff;
  max-width: 15ch;
}

/* Segundo tiempo del titular: misma escala de display, tono secundario.
   La jerarquía vive dentro del propio titular. */
.h1-sub {
  display: block;
  margin-top: 0.28em;
  font-size: clamp(1.55rem, 1rem + 1.9vw, 2.55rem);
  font-weight: 500;
  line-height: 1.12;
  letter-spacing: -0.028em;
  color: var(--text-muted-on-dark);
  max-width: 21ch;
}

.hero-lead {
  font-size: 1.06rem;
  color: var(--text-muted-on-dark);
  max-width: 50ch;
  margin-bottom: 36px;
}

.hero-actions {
  display: flex;
  flex-wrap: wrap;
  gap: 13px;
}

.hero-note {
  margin-top: 26px;
  font-size: 0.9rem;
  color: var(--text-faint-on-dark);
}

.hero-note a {
  color: var(--blue-300);
  border-bottom: 1px solid rgba(127, 168, 255, 0.32);
  padding-bottom: 1px;
  transition: color var(--dur) var(--ease), border-color var(--dur) var(--ease);
}

.hero-note a:hover { color: #fff; border-bottom-color: #fff; }

/* -- Diagrama de ruteo ----------------------------------------------------- */

.flow {
  border: 1px solid var(--line-dark);
  border-radius: var(--r-lg);
  background: rgba(255, 255, 255, 0.028);
  box-shadow: var(--shadow-lg);
}

.flow-head {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 16px;
  padding: 15px clamp(20px, 2vw, 26px);
  border-bottom: 1px solid var(--line-dark);
  color: var(--blue-300);
}

.flow-status {
  display: inline-flex;
  align-items: center;
  gap: 7px;
  font-family: var(--font-mono);
  font-size: 0.645rem;
  font-weight: 400;
  letter-spacing: 0.13em;
  text-transform: uppercase;
  color: var(--text-faint-on-dark);
}

.flow-status i {
  width: 5px;
  height: 5px;
  border-radius: 1.5px;
  background: var(--blue-400);
  animation: blink 2.6s var(--ease) infinite;
}

@keyframes blink {
  0%, 100% { opacity: 1; }
  50%      { opacity: 0.35; }
}

.flow-stages {
  position: relative;
  padding: clamp(20px, 2.2vw, 28px) clamp(20px, 2vw, 26px);
}

/* El riel: línea base + un pulso azul que la recorre de arriba abajo */
.flow-stages::before {
  content: "";
  position: absolute;
  left: calc(clamp(20px, 2vw, 26px) + 4px);
  top: clamp(26px, 2.6vw, 34px);
  bottom: clamp(26px, 2.6vw, 34px);
  width: 1px;
  background-color: var(--line-dark-strong);
  background-image: linear-gradient(180deg,
      transparent 0%, transparent 42%,
      var(--blue-400) 50%,
      transparent 58%, transparent 100%);
  background-size: 100% 220%;
  background-repeat: no-repeat;
  animation: rail-run 4.6s linear infinite;
}

@keyframes rail-run {
  from { background-position: 0 -120%; }
  to   { background-position: 0 220%; }
}

.flow-stage {
  position: relative;
  padding-left: 26px;
}

.flow-stage + .flow-stage { margin-top: 22px; }

/* Nodo montado sobre el riel */
.flow-stage::before {
  content: "";
  position: absolute;
  left: 0;
  top: 6px;
  width: 9px;
  height: 9px;
  border-radius: 2.5px;
  background: var(--ink-900);
  box-shadow: inset 0 0 0 1.5px var(--blue-300);
}

.flow-stage-core::before {
  background: var(--blue-500);
  box-shadow: 0 0 0 3px rgba(11, 98, 245, 0.22);
}

.flow-kicker {
  font-family: var(--font-mono);
  font-size: 0.665rem;
  font-weight: 500;
  letter-spacing: 0.16em;
  text-transform: uppercase;
  color: var(--blue-300);
  margin-bottom: 9px;
}

.flow-stage-core .flow-kicker { color: #fff; }

.flow-items li {
  font-size: 0.905rem;
  line-height: 1.5;
  color: var(--text-muted-on-dark);
}

.flow-items li + li { margin-top: 4px; }

.flow-foot {
  padding: 15px clamp(20px, 2vw, 26px);
  border-top: 1px solid var(--line-dark);
  font-size: 0.83rem;
  color: var(--text-faint-on-dark);
}

/* -- Riel de capacidades: la base de la composición del primer viewport ---- */

.hero-rail {
  display: flex;
  flex-wrap: wrap;
  align-items: center;
  border-top: 1px solid var(--line-dark);
  padding-block: 20px;
}

.hero-rail li {
  display: flex;
  align-items: center;
  gap: 10px;
  padding-right: 22px;
  margin-right: 22px;
  font-family: var(--font-mono);
  font-size: 0.665rem;
  font-weight: 400;
  letter-spacing: 0.13em;
  text-transform: uppercase;
  color: var(--text-faint-on-dark);
  white-space: nowrap;
  border-right: 1px solid var(--line-dark);
}

.hero-rail li:last-child { border-right: 0; margin-right: 0; padding-right: 0; }

.hero-rail li::before {
  content: "";
  width: 4px;
  height: 4px;
  flex: none;
  border-radius: 1.5px;
  background: var(--blue-500);
}

/* --------------------------------------------------------------------------
   12. Servicios — libro de rieles, no rejilla de tarjetas
   -------------------------------------------------------------------------- */

.services { background: var(--paper); }

.aside-count {
  margin-top: 26px;
  padding-top: 16px;
  border-top: 1px solid var(--line);
  color: var(--text-faint);
}

.ledger { border-bottom: 1px solid var(--line); }
.ledger > .ledger-row:first-child { border-top: 0; }

.ledger-row {
  position: relative;
  display: grid;
  grid-template-columns: 2.7rem minmax(0, 1fr);
  gap: clamp(14px, 1.4vw, 22px);
  padding: clamp(26px, 2.6vw, 34px) 0;
  border-top: 1px solid var(--line);
  transition: background-color var(--dur) var(--ease);
}

/* Señal azul que se dibuja sobre el riel superior al pasar el cursor */
.ledger-row::before {
  content: "";
  position: absolute;
  top: -1px;
  left: 0;
  right: 0;
  height: 1px;
  background: var(--blue-500);
  transform: scaleX(0);
  transform-origin: left center;
  transition: transform 0.34s var(--ease);
}

.ledger-row:hover::before { transform: scaleX(1); }

.ledger-num {
  font-family: var(--font-mono);
  font-size: 0.86rem;
  font-weight: 500;
  letter-spacing: 0.06em;
  color: var(--text-faint);
  padding-top: 0.28em;
  transition: color var(--dur) var(--ease);
}

.ledger-row:hover .ledger-num { color: var(--blue-500); }

.ledger-body { transition: transform var(--dur) var(--ease); }
.ledger-row:hover .ledger-body { transform: translateX(4px); }

.ledger-body h3 { margin-bottom: 9px; }

.ledger-body > p {
  font-size: 0.975rem;
  color: var(--text-muted);
  max-width: 52ch;
}

.ledger-tags {
  margin-top: 13px;
  font-family: var(--font-mono);
  font-size: 0.615rem;
  font-weight: 400;
  letter-spacing: 0.095em;
  text-transform: uppercase;
  color: var(--text-faint);
}

/* --------------------------------------------------------------------------
   13. Proceso — cifras fantasma sobre un riel continuo
   -------------------------------------------------------------------------- */

.process { background: var(--paper-alt); border-block: 1px solid var(--line); }

.track {
  display: grid;
  grid-template-columns: repeat(4, minmax(0, 1fr));
  border-top: 1px solid var(--line-strong);
}

.track-step {
  position: relative;
  display: flex;
  flex-direction: column;
  padding: 34px clamp(18px, 2vw, 30px) 4px 0;
}

.track-step + .track-step {
  padding-left: clamp(18px, 2vw, 30px);
  border-left: 1px solid var(--line);
}

/* Nodo sobre el riel superior */
.track-step::before {
  content: "";
  position: absolute;
  top: -5px;
  left: 0;
  width: 10px;
  height: 10px;
  border-radius: 3px;
  background: var(--blue-500);
  box-shadow: 0 0 0 4px var(--paper-alt);
}

.track-step + .track-step::before { left: clamp(18px, 2vw, 30px); }

.track-ghost {
  display: block;
  font-family: var(--font-display);
  font-size: clamp(3.2rem, 2rem + 3.4vw, 5rem);
  font-weight: 620;
  line-height: 0.85;
  letter-spacing: -0.05em;
  color: var(--line-strong);
  margin-bottom: 18px;
  user-select: none;
}

@supports (-webkit-text-stroke: 1px currentColor) {
  .track-ghost {
    color: transparent;
    -webkit-text-stroke: 1px var(--line-strong);
  }
}

.track-body {
  display: grid;
  grid-template-rows: auto 1fr auto;
  flex: 1;
}

.track-body h3 { margin-bottom: 10px; }

.track-body > p {
  font-size: 0.95rem;
  color: var(--text-muted);
  margin-bottom: 22px;
}

.track-out {
  display: flex;
  flex-direction: column;
  gap: 4px;
  padding-top: 14px;
  border-top: 1px solid var(--line);
  font-size: 0.875rem;
  color: var(--text);
  min-height: 5.6em;
}

.track-out .mono-label { color: var(--blue-600); font-size: 0.63rem; }

/* --------------------------------------------------------------------------
   14. IA aplicada
   -------------------------------------------------------------------------- */

.ai {
  position: relative;
  isolation: isolate;
  overflow: hidden;
  background: var(--ink-900);
  color: var(--text-on-dark);
}

.ai-copy h2 { color: #fff; margin-bottom: 24px; max-width: 19ch; }

.ai-copy > p {
  color: var(--text-muted-on-dark);
  max-width: 54ch;
  font-size: 1.01rem;
}

.ai-copy > p + p { margin-top: 16px; }

/* -- Casos: pestañas accesibles -------------------------------------------- */

.cases {
  border: 1px solid var(--line-dark);
  border-radius: var(--r-lg);
  background: rgba(255, 255, 255, 0.028);
  box-shadow: var(--shadow-lg);
  overflow: hidden;
}

.cases-title {
  padding: 16px clamp(20px, 2vw, 28px);
  color: var(--blue-300);
  border-bottom: 1px solid var(--line-dark);
}

.cases-tabs {
  display: flex;
  border-bottom: 1px solid var(--line-dark);
}

.cases-tab {
  flex: 1 1 0;
  min-width: 0;
  padding: 14px 10px;
  font-family: var(--font-mono);
  font-size: 0.665rem;
  font-weight: 400;
  letter-spacing: 0.13em;
  text-transform: uppercase;
  color: var(--text-faint-on-dark);
  border-bottom: 2px solid transparent;
  transition: color var(--dur) var(--ease),
              background-color var(--dur) var(--ease),
              border-color var(--dur) var(--ease);
}

.cases-tab + .cases-tab { border-left: 1px solid var(--line-dark); }

.cases-tab:hover { color: var(--text-on-dark); background: rgba(255, 255, 255, 0.04); }

.cases-tab[aria-selected="true"] {
  color: #fff;
  font-weight: 500;
  border-bottom-color: var(--blue-500);
  background: rgba(11, 98, 245, 0.1);
}

/* Los tres paneles se apilan en la misma celda: la altura la fija el más
   alto y no hay salto al cambiar de pestaña. */
.cases-panels { display: grid; }

.cases-panel {
  grid-area: 1 / 1;
  padding: clamp(20px, 2.2vw, 28px) clamp(20px, 2vw, 28px) 4px;
}

.cases-panel[hidden] { display: block; visibility: hidden; }

.cases-flow > div {
  display: grid;
  grid-template-columns: 6.2rem minmax(0, 1fr);
  gap: 8px 16px;
  padding-block: 14px;
}

.cases-flow > div + div { border-top: 1px solid var(--line-dark); }

.cases-flow dt {
  font-family: var(--font-mono);
  font-size: 0.645rem;
  font-weight: 500;
  letter-spacing: 0.14em;
  text-transform: uppercase;
  color: var(--blue-300);
  padding-top: 0.28em;
}

.cases-flow dd {
  font-size: 0.935rem;
  line-height: 1.5;
  color: var(--text-on-dark);
}

.cases-foot {
  padding: 16px clamp(20px, 2vw, 28px);
  border-top: 1px solid var(--line-dark);
  font-size: 0.845rem;
  color: var(--text-faint-on-dark);
}

/* --------------------------------------------------------------------------
   15. Empresa
   -------------------------------------------------------------------------- */

.about { background: var(--paper); }

.about-copy h2 { margin-bottom: 24px; max-width: 17ch; }

.about-copy > p {
  color: var(--text-muted);
  font-size: 1.02rem;
  max-width: 54ch;
}

.about-copy > p + p { margin-top: 16px; }

.tenets {
  margin-top: 40px;
  border-top: 1px solid var(--line);
}

.tenets li {
  padding-block: 20px;
  border-bottom: 1px solid var(--line);
}

.tenets h3 {
  display: flex;
  align-items: center;
  gap: 11px;
  margin-bottom: 6px;
  font-size: 1.02rem;
}

.tenets h3::before {
  content: "";
  width: 7px;
  height: 7px;
  flex: none;
  border-radius: 2px;
  background: var(--blue-500);
}

.tenets p {
  font-size: 0.935rem;
  color: var(--text-muted);
  padding-left: 18px;
  max-width: 56ch;
}

/* -- Ficha ----------------------------------------------------------------- */

.sheet {
  position: sticky;
  top: calc(var(--header-h) + 44px);
  border: 1px solid var(--line);
  border-radius: var(--r-lg);
  background: var(--paper-alt);
  overflow: hidden;
}

.sheet-title {
  padding: 15px clamp(18px, 1.8vw, 24px);
  color: var(--blue-600);
  border-bottom: 1px solid var(--line);
  background: var(--paper);
}

.sheet-rows > div {
  display: grid;
  grid-template-columns: minmax(0, 7.5rem) minmax(0, 1fr);
  gap: 6px 18px;
  padding: 15px clamp(18px, 1.8vw, 24px);
}

.sheet-rows > div + div { border-top: 1px solid var(--line); }

.sheet-rows dt {
  font-family: var(--font-mono);
  font-size: 0.645rem;
  font-weight: 400;
  letter-spacing: 0.13em;
  text-transform: uppercase;
  color: var(--text-faint);
  padding-top: 0.32em;
}

.sheet-rows dd { font-size: 0.925rem; color: var(--text); }

.sheet-rows dd a {
  color: var(--blue-600);
  border-bottom: 1px solid rgba(10, 84, 220, 0.3);
  transition: color var(--dur) var(--ease), border-color var(--dur) var(--ease);
}

.sheet-rows dd a:hover { color: var(--blue-700); border-bottom-color: var(--blue-600); }

/* --------------------------------------------------------------------------
   16. Cierre comercial
   -------------------------------------------------------------------------- */

.closing {
  position: relative;
  isolation: isolate;
  overflow: hidden;
  background: var(--ink-800);
  color: var(--text-on-dark);
  padding-block: clamp(80px, 8vw, 124px);
}

.closing-inner {
  display: grid;
  grid-template-columns: minmax(0, 6.4fr) minmax(0, 4.6fr);
  gap: clamp(44px, 5vw, 90px);
  align-items: center;
}

.closing-copy h2 {
  color: #fff;
  max-width: 17ch;
  margin-bottom: 18px;
  font-size: clamp(1.9rem, 1.25rem + 2.3vw, 3rem);
}

.closing-copy > p {
  color: var(--text-muted-on-dark);
  font-size: 1.06rem;
  max-width: 48ch;
  margin-bottom: 34px;
}

.closing-actions { display: flex; flex-wrap: wrap; gap: 13px; }

.closing-steps { border-top: 1px solid var(--line-dark); }

.closing-steps li {
  display: grid;
  grid-template-columns: 2.6rem minmax(0, 1fr);
  gap: 16px;
  padding-block: 20px;
  border-bottom: 1px solid var(--line-dark);
}

.closing-steps .mono-label { color: var(--blue-300); padding-top: 0.22em; }

.closing-steps p {
  font-size: 0.965rem;
  color: var(--text-on-dark);
}

/* --------------------------------------------------------------------------
   17. Footer
   -------------------------------------------------------------------------- */

.site-footer {
  background: var(--ink-950);
  color: var(--text-muted-on-dark);
}

.footer-top {
  display: grid;
  grid-template-columns: minmax(0, 1.7fr) repeat(3, minmax(0, 1fr));
  gap: 44px;
  padding-block: clamp(52px, 6vw, 76px);
}

.footer-blurb {
  margin-top: 20px;
  font-size: 0.9rem;
  max-width: 32ch;
  color: var(--text-muted-on-dark);
}

.footer-heading {
  font-family: var(--font-mono);
  font-size: 0.65rem;
  font-weight: 500;
  letter-spacing: 0.16em;
  text-transform: uppercase;
  color: var(--text-faint-on-dark);
  margin-bottom: 18px;
}

.footer-col ul { display: grid; gap: 11px; }

.footer-col a,
.footer-email {
  font-size: 0.92rem;
  color: var(--text-on-dark);
  border-bottom: 1px solid transparent;
  padding-bottom: 1px;
  transition: color var(--dur) var(--ease), border-color var(--dur) var(--ease);
}

.footer-col a { display: inline-block; }
.footer-col a:hover { color: var(--blue-300); border-bottom-color: var(--blue-300); }

.footer-plain li { font-size: 0.92rem; color: var(--text-muted-on-dark); }

.footer-email {
  display: inline-block;
  font-weight: 560;
  border-bottom-color: rgba(127, 168, 255, 0.32);
}

.footer-email:hover { color: var(--blue-300); border-bottom-color: var(--blue-300); }

.footer-domain {
  margin-top: 10px;
  font-family: var(--font-mono);
  font-size: 0.75rem;
  letter-spacing: 0.06em;
  color: var(--text-faint-on-dark);
}

.footer-bottom {
  display: flex;
  flex-wrap: wrap;
  gap: 8px 24px;
  justify-content: space-between;
  padding-block: 22px;
  border-top: 1px solid var(--line-dark);
  font-size: 0.815rem;
  color: var(--text-faint-on-dark);
}

/* --------------------------------------------------------------------------
   18. Aparición al hacer scroll
   Sin JS (o sin soporte) el contenido queda visible: la clase la añade el
   script sólo cuando puede observarlo.
   -------------------------------------------------------------------------- */

.js-reveal [data-reveal] {
  opacity: 0;
  transform: translateY(16px);
  transition: opacity 0.6s var(--ease), transform 0.6s var(--ease);
  transition-delay: var(--reveal-delay, 0s);
}

.js-reveal [data-reveal].is-in { opacity: 1; transform: none; }

/* --------------------------------------------------------------------------
   19. Responsive
   -------------------------------------------------------------------------- */

@media (max-width: 1140px) {
  .split-sticky { grid-template-columns: minmax(0, 4.6fr) minmax(0, 7fr); }
  .footer-top { grid-template-columns: minmax(0, 1.5fr) repeat(3, minmax(0, 1fr)); gap: 32px; }
}

@media (max-width: 1024px) {
  .hero-shell { min-height: 0; }
  .hero-main { grid-template-columns: 1fr; gap: 48px; align-items: start; }
  .h1-lead { max-width: 18ch; }
  .h1-sub { max-width: 30ch; }

  .split,
  .split-sticky,
  .split-ai,
  .split-about { grid-template-columns: 1fr; }

  .sticky-block,
  .sheet { position: static; }

  .sticky-block .lead { max-width: 58ch; }

  .section-head-wide { grid-template-columns: 1fr; align-items: start; gap: 20px; }
  .section-head-wide h2 { max-width: 20ch; }

  .ai-copy h2,
  .about-copy h2,
  .closing-copy h2 { max-width: 24ch; }

  .closing-inner { grid-template-columns: 1fr; gap: 48px; align-items: start; }

  .track { grid-template-columns: repeat(2, minmax(0, 1fr)); }
  .track-step:nth-child(3),
  .track-step:nth-child(4) { margin-top: 40px; border-top: 1px solid var(--line-strong); }
  .track-step:nth-child(3) { padding-left: 0; border-left: 0; }
  .track-step:nth-child(3)::before { left: 0; }
}

@media (max-width: 860px) {
  :root { --header-h: 62px; }

  .nav-toggle { display: flex; }

  .primary-nav {
    position: fixed;
    top: var(--header-h);
    right: 0;
    bottom: 0;
    width: min(340px, 86vw);
    flex-direction: column;
    align-items: stretch;
    justify-content: flex-start;
    gap: 8px;
    padding: 26px 22px calc(26px + env(safe-area-inset-bottom));
    background: var(--paper);
    border-left: 1px solid var(--line);
    box-shadow: var(--shadow-lg);
    overflow-y: auto;
    /* visibility mantiene los enlaces fuera del orden de tabulación
       mientras el panel está cerrado */
    visibility: hidden;
    transform: translateX(100%);
    transition: transform 0.28s var(--ease), visibility 0s linear 0.28s;
  }

  .primary-nav.is-open {
    visibility: visible;
    transform: translateX(0);
    transition: transform 0.28s var(--ease), visibility 0s linear 0s;
  }

  .nav-list { flex-direction: column; align-items: stretch; gap: 2px; }

  .nav-list a {
    padding: 13px 12px;
    font-size: 1rem;
    border-radius: var(--r-sm);
  }

  .nav-list a span::after { display: none; }

  .nav-list a[aria-current="true"] { background: var(--blue-050); color: var(--blue-700); }

  .nav-cta { margin-top: 14px; padding-block: 13px; }

  /* Dentro del panel deslizante el fondo es claro: la cabecera puede estar
     en modo oscuro, pero los enlaces del panel no. */
  .site-header.is-dark .nav-list a { color: var(--text-muted); }
  .site-header.is-dark .nav-list a:hover { color: var(--text); }
  .site-header.is-dark .nav-list a[aria-current="true"] {
    color: var(--blue-700);
    background: var(--blue-050);
  }

  .nav-scrim {
    position: fixed;
    inset: var(--header-h) 0 0;
    z-index: 90;
    background: rgba(4, 8, 15, 0.62);
    opacity: 0;
    visibility: hidden;
    transition: opacity 0.28s var(--ease), visibility 0s linear 0.28s;
  }

  .nav-scrim.is-open { opacity: 1; visibility: visible; transition-delay: 0s, 0s; }

  .footer-top { grid-template-columns: repeat(2, minmax(0, 1fr)); gap: 40px 32px; }
  .footer-brand { grid-column: 1 / -1; }
}

@media (max-width: 680px) {
  :root { --gutter: 20px; }

  body { font-size: 16px; }

  .hero { padding-top: calc(var(--header-h) + 44px); }
  .hero h1 { margin-bottom: 22px; }
  .h1-lead { max-width: none; }
  .h1-sub { max-width: none; }
  .hero-lead { margin-bottom: 30px; }

  .hero-actions .btn,
  .closing-actions .btn { flex: 1 1 100%; }

  /* El riel de capacidades pasa a dos filas, sin separadores colgando */
  .hero-rail { gap: 10px 0; padding-block: 18px; }
  .hero-rail li { padding-right: 14px; margin-right: 14px; }

  .ledger-row { grid-template-columns: 1fr; gap: 10px; }
  .ledger-num { padding-top: 0; }
  .ledger-row:hover .ledger-body { transform: none; }

  .track { grid-template-columns: 1fr; }
  .track-step { padding-right: 0; }
  .track-step + .track-step {
    padding-left: 0;
    border-left: 0;
    margin-top: 36px;
    border-top: 1px solid var(--line-strong);
  }
  .track-step + .track-step::before { left: 0; }

  .cases-flow > div { grid-template-columns: 1fr; gap: 5px; }
  .cases-flow dt { padding-top: 0; }

  .sheet-rows > div { grid-template-columns: 1fr; gap: 4px; }
  .sheet-rows dt { padding-top: 0; }

  .closing-steps li { grid-template-columns: 2.1rem minmax(0, 1fr); gap: 12px; }

  .footer-top { grid-template-columns: 1fr; gap: 34px; }
  .footer-brand { grid-column: auto; }

  .brand-mark { height: 26px; }
  .brand-name { font-size: 0.86rem; }
}

@media (max-width: 380px) {
  .brand-tag { display: none; }
  .cases-tab { padding-inline: 6px; letter-spacing: 0.08em; }
}

/* --------------------------------------------------------------------------
   20. Movimiento reducido
   -------------------------------------------------------------------------- */

@media (prefers-reduced-motion: reduce) {
  html { scroll-behavior: auto; }

  *,
  *::before,
  *::after {
    animation-duration: 0.001ms !important;
    animation-iteration-count: 1 !important;
    transition-duration: 0.001ms !important;
    scroll-behavior: auto !important;
  }

  .js-reveal [data-reveal] { opacity: 1; transform: none; }

  .flow-stages::before { background-image: none; }
  .kicker-dot::after { display: none; }
  .flow-status i { animation: none; }

  /* La visibilidad del panel móvil no puede colapsar a 0s con retardo */
  .primary-nav { transition: transform 0.001ms, visibility 0s linear 0.001ms !important; }
}

/* --------------------------------------------------------------------------
   21. Impresión
   -------------------------------------------------------------------------- */

@media print {
  .site-header, .nav-scrim, .flow, .cases, .hero-beam, .grid-field,
  .skip-link, .scroll-progress { display: none !important; }

  .hero, .ai, .closing, .site-footer, .process {
    background: #fff !important;
    color: #000 !important;
  }

  .h1-lead, .h1-sub, .ai-copy h2, .closing-copy h2 { color: #000 !important; }

  .hero-lead, .ai-copy p, .closing-copy p, .footer-blurb,
  .hero-rail li, .closing-steps p { color: #333 !important; }

  .js-reveal [data-reveal] { opacity: 1 !important; transform: none !important; }
}