/* ==========================================================================
   PRAXIA · Consultoría y Sistemas Empresariales
   Sistema de diseño web · v1.0
   --------------------------------------------------------------------------
   Estructura del archivo
   01. Tokens
   02. Reset y base
   03. Tipografía
   04. Layout y utilidades
   05. Superficies, texturas y decoración
   06. Botones y enlaces
   07. Header y navegación
   08. Hero
   09. Bloques de contenido (tarjetas, listas, señales)
   10. Método (scroll horizontal)
   11. Casos y pestañas
   12. Acordeón / FAQ
   13. Formulario
   14. Footer
   15. Animación y motion
   16. Responsive
   17. Accesibilidad y utilidades finales
   ========================================================================== */

/* ==========================================================================
   01. TOKENS
   Paleta oficial PRAXIA (Manual de marca):
   Azul PRAXIA #10263A · Verde Flujo #1F6F78 · Marfil #F7F5EF
   Arena #E8DFC9 · Cobre #C47A4A · Grafito #24313A
   Nota: la dirección elegida es dominante oscura. Los tonos --px-flow-400/300
   son derivaciones del Verde Flujo, necesarias para cumplir contraste AA
   sobre fondos profundos. El verde oficial se conserva en botones y sólidos.
   ========================================================================== */
/* --------------------------------------------------------------------------
   Ciclo cromático
   El sitio recorre tres paletas ancladas a la marca (Verde Flujo · Azul PRAXIA
   electrificado · Cobre/ámbar), fundiéndose entre sí sobre una base casi negra.
   Cada paleta se mantiene ~7 s y transiciona ~2 s. Las tres cumplen contraste
   AA para texto pequeño sobre el fondo y para marfil sobre el botón sólido.
   Se congela en Verde Flujo con prefers-reduced-motion.
   -------------------------------------------------------------------------- */
@property --px-acc      { syntax: "<color>"; inherits: true; initial-value: #3FC9BC; }
@property --px-acc-mid  { syntax: "<color>"; inherits: true; initial-value: #39A7A0; }
@property --px-acc-deep { syntax: "<color>"; inherits: true; initial-value: #1F6F78; }
@property --px-acc-tint { syntax: "<color>"; inherits: true; initial-value: rgba(57,167,160,0.13); }
@property --px-acc-line { syntax: "<color>"; inherits: true; initial-value: rgba(57,167,160,0.30); }
@property --px-acc-glow { syntax: "<color>"; inherits: true; initial-value: rgba(31,111,120,0.62); }

@keyframes pxPalette {
  0%, 22% {                              /* Verde Flujo */
    --px-acc:      #3FC9BC;
    --px-acc-mid:  #39A7A0;
    --px-acc-deep: #1F6F78;
    --px-acc-tint: rgba(57,167,160,0.13);
    --px-acc-line: rgba(57,167,160,0.30);
    --px-acc-glow: rgba(31,111,120,0.62);
  }
  33%, 55% {                             /* Azul PRAXIA electrificado */
    --px-acc:      #8A93FF;
    --px-acc-mid:  #6E7BFF;
    --px-acc-deep: #2B2FA8;
    --px-acc-tint: rgba(110,123,255,0.14);
    --px-acc-line: rgba(110,123,255,0.32);
    --px-acc-glow: rgba(43,47,168,0.68);
  }
  66%, 88% {                             /* Cobre / ámbar */
    --px-acc:      #F2A45C;
    --px-acc-mid:  #E8890A;
    --px-acc-deep: #A34A08;
    --px-acc-tint: rgba(232,137,10,0.12);
    --px-acc-line: rgba(232,137,10,0.30);
    --px-acc-glow: rgba(163,74,8,0.55);
  }
  100% {                                 /* vuelve a Verde Flujo */
    --px-acc:      #3FC9BC;
    --px-acc-mid:  #39A7A0;
    --px-acc-deep: #1F6F78;
    --px-acc-tint: rgba(57,167,160,0.13);
    --px-acc-line: rgba(57,167,160,0.30);
    --px-acc-glow: rgba(31,111,120,0.62);
  }
}

:root {
  animation: pxPalette 27s linear infinite;

  /* Superficies oscuras (base neutra para que el color del ciclo domine) */
  --px-abyss:        #07080C;
  --px-navy-900:     #0D0F15;
  --px-navy:         #10263A;
  --px-navy-700:     #14293C;
  --px-navy-600:     #17334A;
  --px-graphite:     #24313A;

  /* Superficies claras */
  --px-ivory:        #F7F5EF;
  --px-ivory-dim:    #EFEBE1;
  --px-sand:         #E8DFC9;

  /* Acentos · enlazados al ciclo cromático.
     Los nombres se conservan para no romper el resto del sistema. */
  --px-flow:         var(--px-acc-deep);
  --px-flow-500:     var(--px-acc-deep);
  --px-flow-400:     var(--px-acc-mid);
  --px-flow-300:     var(--px-acc);
  --px-copper:       #C47A4A;
  --px-copper-300:   #DFA274;

  /* Valores fijos del manual, para logotipo y elementos que no deben ciclar */
  --px-brand-flow:   #1F6F78;
  --px-brand-navy:   #10263A;
  --px-brand-copper: #C47A4A;

  /* Texto sobre oscuro */
  --px-text:         #EDEBE4;
  --px-text-soft:    #C3CDD4;
  --px-text-muted:   #93A6B2;
  --px-text-faint:   #6C8090;

  /* Texto sobre claro */
  --px-ink:          #10263A;
  --px-ink-soft:     #3C4C58;
  --px-ink-muted:    #5C6D77; /* 4.93:1 sobre marfil · AA */

  /* Líneas y veladuras */
  --px-line:         rgba(232, 223, 201, 0.13);
  --px-line-strong:  rgba(232, 223, 201, 0.24);
  --px-line-ink:     rgba(16, 38, 58, 0.12);
  --px-line-ink-str: rgba(16, 38, 58, 0.22);
  --px-glass:        rgba(255, 255, 255, 0.035);
  --px-glass-2:      rgba(255, 255, 255, 0.06);

  /* Tipografía */
  --px-sans: 'Manrope', ui-sans-serif, -apple-system, BlinkMacSystemFont,
             'Segoe UI', Arial, Helvetica, sans-serif;
  --px-serif: 'Source Serif 4', Georgia, 'Times New Roman', serif;
  --px-mono: ui-monospace, SFMono-Regular, 'SF Mono', Menlo, monospace;

  /* Escala fluida */
  --fs-display: clamp(2.5rem, 1.5rem + 3.5vw, 4.5rem);
  --fs-h1:      clamp(2.35rem, 1.45rem + 3.6vw, 4.1rem);
  --fs-h2:      clamp(1.95rem, 1.35rem + 2.4vw, 3.25rem);
  --fs-h3:      clamp(1.3rem, 1.1rem + 0.75vw, 1.7rem);
  --fs-h4:      clamp(1.08rem, 1rem + 0.35vw, 1.25rem);
  --fs-lead:    clamp(1.05rem, 0.98rem + 0.42vw, 1.32rem);
  --fs-body:    1.0425rem;
  --fs-sm:      0.9375rem;
  --fs-xs:      0.8125rem;
  --fs-eyebrow: 0.75rem;

  /* Espaciado */
  --sp-section:  clamp(4.75rem, 2.5rem + 8vw, 9.5rem);
  --sp-block:    clamp(2.5rem, 1.5rem + 3.5vw, 4.5rem);
  --gutter:      clamp(1.25rem, 0.6rem + 3vw, 3rem);
  --shell:       1260px;
  --shell-narrow: 940px;

  /* Radios */
  --r-xs: 4px;
  --r-sm: 8px;
  --r-md: 12px;
  --r-lg: 18px;
  --r-xl: 26px;
  --r-pill: 999px;

  /* Motion */
  --ease-expo:  cubic-bezier(0.19, 1, 0.22, 1);
  --ease-out:   cubic-bezier(0.22, 0.61, 0.36, 1);
  --ease-inout: cubic-bezier(0.65, 0, 0.35, 1);
  --dur-fast:   180ms;
  --dur-base:   320ms;
  --dur-slow:   700ms;
  --dur-reveal: 900ms;

  /* Sombras */
  --sh-sm: 0 1px 2px rgba(3, 10, 17, 0.4);
  --sh-md: 0 18px 40px -22px rgba(3, 10, 17, 0.85);
  --sh-lg: 0 40px 90px -40px rgba(3, 10, 17, 0.9);
  --sh-ink: 0 22px 50px -30px rgba(16, 38, 58, 0.35);

  --header-h: 76px;
}

/* ==========================================================================
   02. RESET Y BASE
   ========================================================================== */
*, *::before, *::after { box-sizing: border-box; }

html {
  -webkit-text-size-adjust: 100%;
  scroll-behavior: smooth;
  scroll-padding-top: calc(var(--header-h) + 24px);
}

body {
  margin: 0;
  background: var(--px-abyss);
  color: var(--px-text);
  font-family: var(--px-sans);
  font-size: var(--fs-body);
  line-height: 1.62;
  font-weight: 400;
  letter-spacing: -0.006em;
  -webkit-font-smoothing: antialiased;
  -moz-osx-font-smoothing: grayscale;
  text-rendering: optimizeLegibility;
  /* clip en lugar de hidden: evita crear un contenedor de scroll,
     que rompería position:sticky en los descendientes */
  overflow-x: clip;
}

body.px-no-scroll { overflow: hidden; }

img, svg, video, canvas { display: block; max-width: 100%; height: auto; }
svg { flex-shrink: 0; }

button, input, select, textarea {
  font: inherit;
  color: inherit;
  letter-spacing: inherit;
}

::selection { background: var(--px-flow); color: var(--px-ivory); }

:focus-visible {
  outline: 2px solid var(--px-flow-300);
  outline-offset: 3px;
  border-radius: var(--r-xs);
}

/* ==========================================================================
   03. TIPOGRAFÍA
   ========================================================================== */
h1, h2, h3, h4, h5 {
  margin: 0;
  font-weight: 700;
  letter-spacing: -0.032em;
  line-height: 1.04;
  color: var(--px-text);
  text-wrap: balance;
}

h1 { font-size: var(--fs-h1); }
h2 { font-size: var(--fs-h2); }
h3 { font-size: var(--fs-h3); letter-spacing: -0.022em; line-height: 1.18; }
h4 { font-size: var(--fs-h4); letter-spacing: -0.015em; line-height: 1.3; }

p { margin: 0 0 1.05em; }
p:last-child { margin-bottom: 0; }

a { color: inherit; text-decoration: none; }

strong, b { font-weight: 700; color: var(--px-text); }

.px-display {
  font-size: var(--fs-display);
  line-height: 0.97;
  letter-spacing: -0.04em;
  font-weight: 800;
}

.px-lead {
  font-size: var(--fs-lead);
  line-height: 1.55;
  color: var(--px-text-soft);
  font-weight: 400;
  letter-spacing: -0.012em;
  text-wrap: pretty;
}

.px-eyebrow {
  display: inline-flex;
  align-items: center;
  gap: 0.6em;
  margin: 0 0 1.35rem;
  font-size: var(--fs-eyebrow);
  font-weight: 700;
  letter-spacing: 0.2em;
  text-transform: uppercase;
  color: var(--px-flow-400);
  line-height: 1;
}
.px-eyebrow::before {
  content: "";
  width: 26px;
  height: 1px;
  background: currentColor;
  opacity: 0.65;
}
.px-eyebrow--plain::before { display: none; }

.px-accent { color: var(--px-flow-400); }
.px-accent-copper { color: var(--px-copper-300); }

.px-serif {
  font-family: var(--px-serif);
  font-weight: 400;
  font-style: italic;
  letter-spacing: -0.01em;
}

.px-muted { color: var(--px-text-muted); }
.px-soft  { color: var(--px-text-soft); }

.px-num {
  font-variant-numeric: tabular-nums;
  font-feature-settings: "tnum" 1;
}

.px-measure     { max-width: 62ch; }
.px-measure-sm  { max-width: 48ch; }
.px-measure-lg  { max-width: 74ch; }

/* ==========================================================================
   04. LAYOUT Y UTILIDADES
   ========================================================================== */
.px-shell {
  width: 100%;
  max-width: var(--shell);
  margin-inline: auto;
  padding-inline: var(--gutter);
}
.px-shell--narrow { max-width: var(--shell-narrow); }

.px-section {
  position: relative;
  padding-block: var(--sp-section);
}
.px-section--tight { padding-block: clamp(3.25rem, 2rem + 5vw, 6rem); }

.px-section-head {
  display: grid;
  gap: clamp(1.5rem, 4vw, 3.5rem);
  grid-template-columns: minmax(0, 1fr);
  margin-bottom: var(--sp-block);
}
.px-section-head--split {
  grid-template-columns: minmax(0, 1.05fr) minmax(0, 0.95fr);
  align-items: end;
}

.px-grid { display: grid; gap: clamp(1rem, 2vw, 1.5rem); }
.px-grid--2 { grid-template-columns: repeat(2, minmax(0, 1fr)); }
.px-grid--3 { grid-template-columns: repeat(3, minmax(0, 1fr)); }
.px-grid--4 { grid-template-columns: repeat(4, minmax(0, 1fr)); }

.px-stack   { display: flex; flex-direction: column; }
.px-stack-3 { gap: 0.75rem; }
.px-stack-4 { gap: 1rem; }
.px-stack-6 { gap: 1.5rem; }
.px-stack-8 { gap: 2rem; }

.px-row {
  display: flex;
  flex-wrap: wrap;
  align-items: center;
  gap: 0.85rem;
}

.px-divider {
  height: 1px;
  border: 0;
  margin: 0;
  background: var(--px-line);
}

/* ==========================================================================
   05. SUPERFICIES, TEXTURAS Y DECORACIÓN
   ========================================================================== */

/* Fondos de sección */
.px-bg-abyss { background: var(--px-abyss); }
.px-bg-navy  { background: var(--px-navy-900); }

.px-bg-ivory {
  background: var(--px-ivory);
  color: var(--px-ink);
}
.px-bg-ivory h1, .px-bg-ivory h2, .px-bg-ivory h3, .px-bg-ivory h4 { color: var(--px-ink); }
.px-bg-ivory .px-lead { color: var(--px-ink-soft); }
.px-bg-ivory .px-muted { color: var(--px-ink-muted); }
.px-bg-ivory .px-eyebrow { color: var(--px-flow); }
.px-bg-ivory .px-accent { color: var(--px-flow); }
.px-bg-ivory .px-divider { background: var(--px-line-ink); }

/* Retícula técnica (referencia: ritmo de grid del video) */
.px-grid-lines {
  position: absolute;
  inset: 0;
  pointer-events: none;
  background-image:
    linear-gradient(to right, var(--px-line) 1px, transparent 1px),
    linear-gradient(to bottom, var(--px-line) 1px, transparent 1px);
  background-size: 96px 96px;
  -webkit-mask-image: radial-gradient(115% 85% at 50% 0%, #000 5%, transparent 72%);
          mask-image: radial-gradient(115% 85% at 50% 0%, #000 5%, transparent 72%);
  opacity: 0.5;
}

/* Halo de flujo */
.px-glow {
  position: absolute;
  pointer-events: none;
  border-radius: 50%;
  filter: blur(90px);
  opacity: 0.5;
}
.px-glow--flow  { background: radial-gradient(circle, var(--px-acc-glow), transparent 66%); }
.px-glow--copper{ background: radial-gradient(circle, rgba(196,122,74,0.32), transparent 66%); }

/* Grano sutil */
.px-noise::after {
  content: "";
  position: absolute;
  inset: 0;
  pointer-events: none;
  opacity: 0.035;
  mix-blend-mode: overlay;
  background-image: url("data:image/svg+xml,%3Csvg xmlns='http://www.w3.org/2000/svg' width='140' height='140'%3E%3Cfilter id='n'%3E%3CfeTurbulence type='fractalNoise' baseFrequency='0.85' numOctaves='3'/%3E%3C/filter%3E%3Crect width='100%25' height='100%25' filter='url(%23n)'/%3E%3C/svg%3E");
}

/* Tarjeta base */
.px-card {
  position: relative;
  padding: clamp(1.5rem, 1.1rem + 1.1vw, 2.1rem);
  background: linear-gradient(160deg, var(--px-glass) 0%, rgba(255,255,255,0.012) 100%);
  border: 1px solid var(--px-line);
  border-radius: var(--r-lg);
  overflow: hidden;
  transition: border-color var(--dur-base) var(--ease-out),
              transform var(--dur-base) var(--ease-out),
              background-color var(--dur-base) var(--ease-out);
}
.px-card::before {
  content: "";
  position: absolute;
  inset: 0;
  border-radius: inherit;
  padding: 1px;
  background: linear-gradient(140deg, color-mix(in srgb, var(--px-acc-mid) 48%, transparent), transparent 42%);
  -webkit-mask: linear-gradient(#000 0 0) content-box, linear-gradient(#000 0 0);
          mask: linear-gradient(#000 0 0) content-box, linear-gradient(#000 0 0);
  -webkit-mask-composite: xor;
          mask-composite: exclude;
  opacity: 0;
  transition: opacity var(--dur-base) var(--ease-out);
  pointer-events: none;
}
.px-card:hover::before,
.px-card:focus-within::before { opacity: 1; }
.px-card:hover { transform: translateY(-3px); border-color: var(--px-line-strong); }

.px-card--flat { background: var(--px-glass); }
.px-card--ink {
  background: #fff;
  border-color: var(--px-line-ink);
  box-shadow: var(--sh-ink);
  color: var(--px-ink);
}
.px-card--ink::before { background: linear-gradient(140deg, color-mix(in srgb, var(--px-acc-deep) 55%, transparent), transparent 42%); }
.px-card--ink h3, .px-card--ink h4 { color: var(--px-ink); }

/* Etiquetas */
.px-tag {
  display: inline-flex;
  align-items: center;
  gap: 0.45em;
  padding: 0.34em 0.78em;
  border: 1px solid var(--px-line-strong);
  border-radius: var(--r-pill);
  font-size: var(--fs-xs);
  font-weight: 600;
  letter-spacing: 0.06em;
  text-transform: uppercase;
  color: var(--px-text-soft);
  background: var(--px-glass);
  line-height: 1.4;
}
.px-tag--flow {
  color: var(--px-flow-300);
  border-color: var(--px-acc-line);
  background: var(--px-acc-tint);
}
.px-tag--copper {
  color: var(--px-copper-300);
  border-color: rgba(196,122,74,0.34);
  background: rgba(196,122,74,0.12);
}
.px-tag--pending {
  color: var(--px-sand);
  border-color: rgba(232,223,201,0.3);
  border-style: dashed;
  background: transparent;
}
/* Evita que las etiquetas se estiren dentro de contenedores grid/flex */
.px-case__body > .px-tag,
.px-case__aside .px-tag,
.px-solution > .px-tag,
.px-method__body > .px-tag { justify-self: start; align-self: start; width: fit-content; }

/* Marcador de contenido pendiente de definir por PRAXIA */
.px-pending {
  border-bottom: 1px dashed rgba(232, 223, 201, 0.5);
  color: var(--px-sand);
  cursor: help;
}
.px-bg-ivory .px-pending {
  border-bottom-color: rgba(196, 122, 74, 0.6);
  color: var(--px-copper);
}

/* Índice numérico */
.px-index {
  font-family: var(--px-sans);
  font-size: var(--fs-xs);
  font-weight: 700;
  letter-spacing: 0.14em;
  color: var(--px-flow-400);
  font-variant-numeric: tabular-nums;
}

/* ==========================================================================
   06. BOTONES Y ENLACES
   ========================================================================== */
.px-btn {
  --btn-bg: transparent;
  --btn-fg: var(--px-text);
  --btn-bd: var(--px-line-strong);
  position: relative;
  display: inline-flex;
  align-items: center;
  justify-content: center;
  gap: 0.6em;
  padding: 0.86em 1.5em;
  min-height: 48px;
  background: var(--btn-bg);
  color: var(--btn-fg);
  border: 1px solid var(--btn-bd);
  border-radius: var(--r-pill);
  font-size: var(--fs-sm);
  font-weight: 700;
  letter-spacing: -0.008em;
  cursor: pointer;
  overflow: hidden;
  isolation: isolate;
  transition: transform var(--dur-fast) var(--ease-out),
              background-color var(--dur-base) var(--ease-out),
              border-color var(--dur-base) var(--ease-out),
              color var(--dur-base) var(--ease-out);
}
.px-btn:active { transform: translateY(1px) scale(0.995); }

.px-btn svg { transition: transform var(--dur-base) var(--ease-expo); }
.px-btn:hover svg { transform: translateX(3px); }

/* Brillo diagonal al pasar el cursor */
.px-btn::after {
  content: "";
  position: absolute;
  inset: 0;
  z-index: -1;
  background: linear-gradient(115deg, transparent 30%, rgba(255,255,255,0.16) 50%, transparent 70%);
  transform: translateX(-130%);
  transition: transform 750ms var(--ease-expo);
}
.px-btn:hover::after { transform: translateX(130%); }

.px-btn--primary {
  --btn-bg: var(--px-flow);
  --btn-fg: var(--px-ivory);
  --btn-bd: var(--px-flow);
  box-shadow: 0 14px 30px -18px var(--px-acc-glow);
}
/* En hover no se aclara el relleno: en la fase ámbar del ciclo el texto marfil
   perdería contraste. Se refuerza el halo y el borde. */
.px-btn--primary:hover {
  box-shadow: 0 18px 44px -16px var(--px-acc-glow);
  --btn-bd: var(--px-acc-mid);
}

.px-btn--ghost { --btn-bg: var(--px-glass); }
.px-btn--ghost:hover { --btn-bg: var(--px-glass-2); --btn-bd: var(--px-line-strong); }

.px-btn--ink {
  --btn-bg: var(--px-navy);
  --btn-fg: var(--px-ivory);
  --btn-bd: var(--px-navy);
}
.px-btn--ink:hover { --btn-bg: var(--px-navy-600); --btn-bd: var(--px-navy-600); }

.px-btn--outline-ink { --btn-fg: var(--px-ink); --btn-bd: var(--px-line-ink-str); }
.px-btn--outline-ink:hover { --btn-bg: rgba(16,38,58,0.045); }

.px-btn--sm { padding: 0.6em 1.1em; min-height: 40px; font-size: var(--fs-xs); }
.px-btn--block { width: 100%; }

/* Enlace con flecha */
.px-link {
  display: inline-flex;
  align-items: center;
  gap: 0.5em;
  font-size: var(--fs-sm);
  font-weight: 700;
  color: var(--px-flow-400);
  letter-spacing: -0.005em;
  transition: color var(--dur-base) var(--ease-out), gap var(--dur-base) var(--ease-expo);
}
.px-link:hover { color: var(--px-flow-300); gap: 0.75em; }
.px-bg-ivory .px-link { color: var(--px-flow); }
.px-bg-ivory .px-link:hover { color: var(--px-navy); }

.px-link-underline {
  background-image: linear-gradient(currentColor, currentColor);
  background-size: 0% 1px;
  background-repeat: no-repeat;
  background-position: 0 100%;
  transition: background-size var(--dur-base) var(--ease-out);
}
.px-link-underline:hover { background-size: 100% 1px; }

/* ==========================================================================
   07. HEADER Y NAVEGACIÓN
   ========================================================================== */
.px-skip {
  position: absolute;
  top: -100px;
  left: 1rem;
  z-index: 200;
  padding: 0.75rem 1.15rem;
  background: var(--px-flow);
  color: var(--px-ivory);
  border-radius: var(--r-sm);
  font-weight: 700;
  font-size: var(--fs-sm);
  transition: top var(--dur-base) var(--ease-out);
}
.px-skip:focus { top: 1rem; }

.px-header {
  position: fixed;
  inset: 0 0 auto;
  z-index: 100;
  height: var(--header-h);
  display: flex;
  align-items: center;
  border-bottom: 1px solid transparent;
  transition: background-color var(--dur-base) var(--ease-out),
              border-color var(--dur-base) var(--ease-out),
              backdrop-filter var(--dur-base) var(--ease-out);
}
.px-header.is-stuck {
  background: rgba(7, 8, 12, 0.86);
  backdrop-filter: blur(16px) saturate(140%);
  -webkit-backdrop-filter: blur(16px) saturate(140%);
  border-bottom-color: var(--px-line);
}

.px-header__inner {
  width: 100%;
  max-width: var(--shell);
  margin-inline: auto;
  padding-inline: var(--gutter);
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 1.5rem;
}

.px-logo { display: inline-flex; align-items: center; gap: 0.7rem; }
.px-logo__mark {
  height: 32px;
  width: auto;
  transition: transform var(--dur-slow) var(--ease-expo);
}
.px-logo:hover .px-logo__mark { transform: translateY(-2px); }
.px-logo__text { display: grid; gap: 3px; }
.px-logo__word {
  font-size: 1.16rem;
  font-weight: 800;
  letter-spacing: 0.07em;
  line-height: 1;
  color: var(--px-text);
}
.px-logo__sub {
  font-size: 0.5625rem;
  font-weight: 600;
  letter-spacing: 0.135em;
  text-transform: uppercase;
  line-height: 1;
  color: var(--px-text-faint);
  white-space: nowrap;
}
@media (max-width: 520px) {
  .px-logo__sub { display: none; }
}

/* Progreso de lectura */
.px-progress {
  position: absolute;
  left: 0;
  bottom: -1px;
  height: 2px;
  width: 100%;
  transform: scaleX(0);
  transform-origin: 0 50%;
  background: linear-gradient(90deg, var(--px-flow), var(--px-flow-300));
  opacity: 0;
  transition: opacity var(--dur-base) var(--ease-out);
}
.px-header.is-stuck .px-progress { opacity: 1; }

/* Nav desktop */
.px-nav { display: flex; align-items: center; gap: 0.35rem; }

.px-nav__link {
  position: relative;
  display: inline-flex;
  align-items: center;
  gap: 0.35em;
  padding: 0.6rem 0.9rem;
  border-radius: var(--r-pill);
  font-size: var(--fs-sm);
  font-weight: 600;
  color: var(--px-text-soft);
  transition: color var(--dur-base) var(--ease-out), background-color var(--dur-base) var(--ease-out);
}
.px-nav__link:hover { color: var(--px-text); background: var(--px-glass); }
.px-nav__link[aria-current="page"] { color: var(--px-text); }
.px-nav__link[aria-current="page"]::after {
  content: "";
  position: absolute;
  left: 0.9rem;
  right: 0.9rem;
  bottom: 0.32rem;
  height: 1.5px;
  border-radius: 2px;
  background: var(--px-flow-400);
}
.px-nav__chev { transition: transform var(--dur-base) var(--ease-out); }

/* Mega menú */
.px-nav__item { position: relative; }
.px-nav__item--has-menu > .px-nav__link[aria-expanded="true"] .px-nav__chev { transform: rotate(180deg); }

.px-mega {
  position: absolute;
  top: calc(100% + 14px);
  left: 50%;
  translate: -50% 0;
  width: min(660px, calc(100vw - 3rem));
  padding: 0.75rem;
  background: rgba(11, 12, 17, 0.97);
  backdrop-filter: blur(18px);
  -webkit-backdrop-filter: blur(18px);
  border: 1px solid var(--px-line-strong);
  border-radius: var(--r-lg);
  box-shadow: var(--sh-lg);
  display: grid;
  grid-template-columns: repeat(2, minmax(0, 1fr));
  gap: 0.25rem;
  opacity: 0;
  visibility: hidden;
  transform: translateY(-8px);
  transition: opacity var(--dur-base) var(--ease-out),
              transform var(--dur-base) var(--ease-expo),
              visibility var(--dur-base);
}
.px-nav__item.is-open .px-mega {
  opacity: 1;
  visibility: visible;
  transform: translateY(0);
}

.px-mega__item {
  display: grid;
  grid-template-columns: auto minmax(0, 1fr);
  gap: 0.85rem;
  padding: 0.85rem 0.9rem;
  border-radius: var(--r-md);
  transition: background-color var(--dur-fast) var(--ease-out);
}
.px-mega__item:hover { background: var(--px-glass-2); }
.px-mega__icon {
  width: 34px;
  height: 34px;
  display: grid;
  place-items: center;
  border-radius: var(--r-sm);
  background: var(--px-acc-tint);
  border: 1px solid var(--px-acc-line);
  color: var(--px-flow-300);
}
.px-mega__title {
  display: block;
  font-size: var(--fs-sm);
  font-weight: 700;
  color: var(--px-text);
  line-height: 1.35;
  letter-spacing: -0.012em;
}
.px-mega__desc {
  display: block;
  font-size: var(--fs-xs);
  color: var(--px-text-muted);
  line-height: 1.5;
  margin-top: 0.25rem;
}

.px-mega__foot {
  grid-column: 1 / -1;
  margin-top: 0.35rem;
  padding: 0.85rem 0.9rem;
  border-top: 1px solid var(--px-line);
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 1rem;
  font-size: var(--fs-xs);
  color: var(--px-text-muted);
}

.px-header__cta { display: flex; align-items: center; gap: 0.6rem; }

/* Botón hamburguesa */
.px-burger {
  display: none;
  width: 46px;
  height: 46px;
  align-items: center;
  justify-content: center;
  background: var(--px-glass);
  border: 1px solid var(--px-line-strong);
  border-radius: var(--r-pill);
  cursor: pointer;
}
.px-burger__box { display: block; width: 18px; height: 12px; position: relative; }
.px-burger__box span {
  position: absolute;
  left: 0;
  width: 100%;
  height: 1.5px;
  background: var(--px-text);
  border-radius: 2px;
  transition: transform var(--dur-base) var(--ease-expo), opacity var(--dur-fast);
}
.px-burger__box > span:nth-child(1) { top: 0; }
.px-burger__box > span:nth-child(2) { top: 50%; translate: 0 -50%; }
.px-burger__box > span:nth-child(3) { bottom: 0; }
.px-burger[aria-expanded="true"] .px-burger__box > span:nth-child(1) { transform: translateY(5.25px) rotate(45deg); }
.px-burger[aria-expanded="true"] .px-burger__box > span:nth-child(2) { opacity: 0; }
.px-burger[aria-expanded="true"] .px-burger__box > span:nth-child(3) { transform: translateY(-5.25px) rotate(-45deg); }

/* Panel móvil */
.px-mobile {
  position: fixed;
  inset: var(--header-h) 0 0;
  z-index: 99;
  background: var(--px-abyss);
  padding: 1.5rem var(--gutter) 2.5rem;
  overflow-y: auto;
  opacity: 0;
  visibility: hidden;
  transform: translateY(-12px);
  transition: opacity var(--dur-base) var(--ease-out),
              transform var(--dur-slow) var(--ease-expo),
              visibility var(--dur-base);
}
.px-mobile.is-open { opacity: 1; visibility: visible; transform: translateY(0); }

.px-mobile__group + .px-mobile__group { margin-top: 1.75rem; }
.px-mobile__label {
  font-size: var(--fs-eyebrow);
  font-weight: 700;
  letter-spacing: 0.2em;
  text-transform: uppercase;
  color: var(--px-text-faint);
  margin-bottom: 0.75rem;
}
.px-mobile__link {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 1rem;
  padding: 0.9rem 0;
  border-bottom: 1px solid var(--px-line);
  font-size: 1.18rem;
  font-weight: 700;
  letter-spacing: -0.02em;
  color: var(--px-text);
}
.px-mobile__link span:last-child { color: var(--px-flow-400); }
.px-mobile__sub {
  display: block;
  padding: 0.7rem 0;
  border-bottom: 1px solid var(--px-line);
  font-size: var(--fs-sm);
  color: var(--px-text-soft);
}
.px-mobile__cta { margin-top: 2rem; }

/* ==========================================================================
   08. HERO
   ========================================================================== */
.px-hero {
  position: relative;
  padding-top: calc(var(--header-h) + clamp(3rem, 6vw, 6rem));
  padding-bottom: clamp(2.5rem, 4vw, 4rem);
  overflow: hidden;
  isolation: isolate;
}
.px-hero__bg { position: absolute; inset: 0; z-index: -1; overflow: hidden; }
.px-hero__bg .px-glow--flow {
  width: min(1100px, 120vw);
  height: min(780px, 90vh);
  left: 50%;
  top: -32%;
  translate: -50% 0;
  opacity: 0.42;
}
.px-hero__bg .px-glow--copper {
  width: 520px;
  height: 420px;
  right: -12%;
  bottom: -22%;
  opacity: 0.35;
}

.px-hero__grid {
  display: grid;
  grid-template-columns: minmax(0, 1.04fr) minmax(0, 0.96fr);
  gap: clamp(2rem, 4vw, 4.5rem);
  align-items: center;
}
.px-hero--center .px-hero__grid { grid-template-columns: minmax(0, 1fr); text-align: left; }

.px-hero__title { margin-bottom: 1.5rem; }
.px-hero__lead { margin-bottom: 2.25rem; max-width: 54ch; }
.px-hero__actions { display: flex; flex-wrap: wrap; gap: 0.85rem; margin-bottom: 2.25rem; }

.px-hero__meta {
  display: flex;
  flex-wrap: wrap;
  gap: 0.6rem 1.5rem;
  padding-top: 1.5rem;
  border-top: 1px solid var(--px-line);
  font-size: var(--fs-xs);
  color: var(--px-text-muted);
}
.px-hero__meta span { display: inline-flex; align-items: center; gap: 0.5em; }
.px-hero__meta span::before {
  content: "";
  width: 5px;
  height: 5px;
  border-radius: 50%;
  background: var(--px-flow-400);
}

/* Panel del diagrama */
.px-hero__panel {
  position: relative;
  padding: clamp(1.1rem, 1.6vw, 1.6rem);
  background: linear-gradient(155deg, var(--px-acc-tint), rgba(7, 8, 12, 0.72));
  border: 1px solid var(--px-line-strong);
  border-radius: var(--r-xl);
  box-shadow: var(--sh-lg);
  backdrop-filter: blur(8px);
  -webkit-backdrop-filter: blur(8px);
}
.px-hero__panel-head {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 1rem;
  padding: 0 0.4rem 0.9rem;
  border-bottom: 1px solid var(--px-line);
  margin-bottom: 0.9rem;
  font-size: var(--fs-xs);
  letter-spacing: 0.14em;
  text-transform: uppercase;
  font-weight: 700;
  color: var(--px-text-faint);
}

/* Diagrama del hero · sus acentos siguen el ciclo cromático */
.px-diagram .d-stroke { stroke: var(--px-acc-mid); }
.px-diagram .d-fill   { fill: var(--px-acc-mid); }
.px-diagram .d-text   { fill: var(--px-acc); }
.px-diagram .d-box    { fill: var(--px-acc-tint); stroke: var(--px-acc-mid); }

/* Tira de capacidades bajo el hero */
.px-capstrip {
  display: grid;
  grid-template-columns: repeat(5, minmax(0, 1fr));
  gap: 0.75rem;
  margin-top: clamp(2.75rem, 5vw, 4.5rem);
}
.px-capstrip__item {
  display: flex;
  flex-direction: column;
  gap: 0.85rem;
  padding: 1.15rem 1.1rem;
  background: var(--px-glass);
  border: 1px solid var(--px-line);
  border-radius: var(--r-md);
  transition: background-color var(--dur-base) var(--ease-out),
              border-color var(--dur-base) var(--ease-out),
              transform var(--dur-base) var(--ease-out);
}
.px-capstrip__item:hover {
  background: var(--px-glass-2);
  border-color: var(--px-acc-line);
  transform: translateY(-3px);
}
.px-capstrip__item svg { color: var(--px-flow-300); }
.px-capstrip__item span {
  font-size: var(--fs-xs);
  font-weight: 700;
  letter-spacing: -0.005em;
  color: var(--px-text-soft);
  line-height: 1.35;
}

/* Hero interno de páginas */
.px-pagehero {
  position: relative;
  padding-top: calc(var(--header-h) + clamp(3.5rem, 7vw, 6.5rem));
  padding-bottom: clamp(3rem, 6vw, 5.5rem);
  overflow: hidden;
  isolation: isolate;
  border-bottom: 1px solid var(--px-line);
}
.px-pagehero__bg { position: absolute; inset: 0; z-index: -1; overflow: hidden; }
.px-pagehero__bg .px-glow--flow {
  width: 900px; height: 620px; left: 12%; top: -46%; opacity: 0.34;
}
.px-breadcrumb {
  display: flex;
  flex-wrap: wrap;
  align-items: center;
  gap: 0.5rem;
  margin-bottom: 1.75rem;
  font-size: var(--fs-xs);
  color: var(--px-text-faint);
}
.px-breadcrumb a:hover { color: var(--px-flow-400); }
.px-breadcrumb li { list-style: none; display: inline-flex; align-items: center; gap: 0.5rem; }
.px-breadcrumb ol { display: contents; margin: 0; padding: 0; }
.px-breadcrumb li + li::before { content: "/"; opacity: 0.5; }
.px-breadcrumb [aria-current] { color: var(--px-text-soft); }

/* ==========================================================================
   09. BLOQUES DE CONTENIDO
   ========================================================================== */

/* Señales / síntomas */
.px-signal {
  display: grid;
  grid-template-columns: auto minmax(0, 1fr);
  gap: 0.95rem;
  align-items: start;
  padding: 1.25rem 0;
  border-top: 1px solid var(--px-line);
}
.px-signal__dot {
  width: 20px;
  height: 20px;
  margin-top: 0.2rem;
  display: grid;
  place-items: center;
  border-radius: 50%;
  border: 1px solid rgba(196,122,74,0.45);
  background: rgba(196,122,74,0.12);
  color: var(--px-copper-300);
  flex-shrink: 0;
}
.px-signal p { font-size: var(--fs-sm); color: var(--px-text-soft); }

/* Tarjeta de solución */
.px-solution {
  display: flex;
  flex-direction: column;
  gap: 1.15rem;
  min-height: 100%;
}
.px-solution__icon {
  width: 46px;
  height: 46px;
  display: grid;
  place-items: center;
  border-radius: var(--r-md);
  background: var(--px-acc-tint);
  border: 1px solid var(--px-acc-line);
  color: var(--px-flow-300);
}
.px-solution__meta {
  margin-top: auto;
  padding-top: 1.15rem;
  border-top: 1px solid var(--px-line);
  display: flex;
  flex-wrap: wrap;
  align-items: center;
  justify-content: space-between;
  gap: 0.75rem 1rem;
}
.px-solution__pr {
  display: grid;
  gap: 0.5rem;
  font-size: var(--fs-sm);
}
.px-solution__pr dt {
  font-size: var(--fs-xs);
  font-weight: 700;
  letter-spacing: 0.12em;
  text-transform: uppercase;
  color: var(--px-text-faint);
}
.px-solution__pr dd { margin: 0 0 0.65rem; color: var(--px-text-soft); }
.px-solution__pr dd:last-child { margin-bottom: 0; }

.px-card--wide { grid-column: span 2; }

/* Lista de comprobación */
.px-check { list-style: none; margin: 0; padding: 0; display: grid; gap: 0.7rem; }
.px-check li {
  display: grid;
  grid-template-columns: auto minmax(0, 1fr);
  gap: 0.7rem;
  align-items: start;
  font-size: var(--fs-sm);
  color: var(--px-text-soft);
}
.px-check li::before {
  content: "";
  width: 16px;
  height: 16px;
  margin-top: 0.34rem;
  border-radius: 50%;
  background:
    linear-gradient(var(--px-flow-400), var(--px-flow-400)) center/7px 1.5px no-repeat,
    color-mix(in srgb, var(--px-acc-deep) 22%, transparent);
  border: 1px solid var(--px-acc-line);
}
.px-bg-ivory .px-check li { color: var(--px-ink-soft); }
.px-bg-ivory .px-check li::before {
  background: linear-gradient(var(--px-flow), var(--px-flow)) center/7px 1.5px no-repeat, var(--px-acc-tint);
  border-color: var(--px-acc-line);
}

/* Lista "no somos / sí somos" */
.px-contrast { display: grid; gap: 1.25rem; grid-template-columns: repeat(2, minmax(0,1fr)); }
.px-contrast__col { padding: clamp(1.4rem, 1.1rem + 1vw, 2rem); border-radius: var(--r-lg); border: 1px solid var(--px-line); }
.px-contrast__col--yes { background: var(--px-acc-tint); border-color: var(--px-acc-line); }
.px-contrast__col--no  { background: rgba(255,255,255,0.02); }
.px-contrast ul { list-style: none; margin: 1rem 0 0; padding: 0; display: grid; gap: 0.6rem; }
.px-contrast li { font-size: var(--fs-sm); color: var(--px-text-soft); padding-left: 1.35rem; position: relative; }
.px-contrast li::before {
  position: absolute;
  left: 0;
  top: 0.02em;
  font-weight: 700;
}
.px-contrast__col--yes li::before { content: "+"; color: var(--px-flow-300); }
.px-contrast__col--no  li::before { content: "−"; color: var(--px-text-faint); }

/* Resultados */
.px-result {
  padding: 1.4rem 1.35rem;
  border: 1px solid var(--px-line);
  border-radius: var(--r-md);
  background: var(--px-glass);
  transition: background-color var(--dur-base) var(--ease-out), border-color var(--dur-base) var(--ease-out);
}
.px-result:hover { background: var(--px-glass-2); border-color: var(--px-acc-line); }
.px-result h3, .px-result h4 {
  font-size: var(--fs-h4);
  letter-spacing: -0.015em;
  line-height: 1.3;
  margin-bottom: 0.45rem;
}
.px-result p { font-size: var(--fs-sm); color: var(--px-text-muted); }

/* Cita editorial */
.px-quote {
  position: relative;
  padding: clamp(2rem, 1.4rem + 2vw, 3.25rem);
  border-radius: var(--r-xl);
  border: 1px solid var(--px-line-strong);
  background:
    radial-gradient(120% 140% at 0% 0%, color-mix(in srgb, var(--px-acc-deep) 22%, transparent), transparent 58%),
    rgba(255,255,255,0.025);
}
.px-quote__text {
  font-family: var(--px-serif);
  font-style: italic;
  font-size: clamp(1.4rem, 1.1rem + 1.5vw, 2.35rem);
  line-height: 1.25;
  letter-spacing: -0.02em;
  color: var(--px-text);
  text-wrap: balance;
}
.px-quote__by {
  margin-top: 1.5rem;
  font-size: var(--fs-xs);
  letter-spacing: 0.14em;
  text-transform: uppercase;
  color: var(--px-text-faint);
  font-weight: 700;
}

/* Declaración a pantalla (lectura progresiva) */
.px-statement {
  font-size: clamp(1.55rem, 1rem + 2.6vw, 3.1rem);
  font-weight: 700;
  line-height: 1.22;
  letter-spacing: -0.03em;
  text-wrap: balance;
  max-width: 22ch;
}

/* Fila de datos / definiciones */
.px-deflist { display: grid; gap: 0; margin: 0; }
.px-deflist__row {
  display: grid;
  grid-template-columns: minmax(0, 0.34fr) minmax(0, 0.66fr);
  gap: clamp(1rem, 3vw, 2.5rem);
  padding: 1.5rem 0;
  border-top: 1px solid var(--px-line);
  align-items: start;
}
.px-deflist__row:last-child { border-bottom: 1px solid var(--px-line); }
.px-deflist__term { font-size: var(--fs-h4); font-weight: 700; letter-spacing: -0.018em; }
.px-deflist__desc { font-size: var(--fs-sm); color: var(--px-text-soft); margin: 0; }
.px-bg-ivory .px-deflist__row { border-color: var(--px-line-ink); }
.px-bg-ivory .px-deflist__desc { color: var(--px-ink-soft); }

/* Banda CTA */
.px-cta {
  position: relative;
  overflow: hidden;
  isolation: isolate;
  border-top: 1px solid var(--px-line);
}
.px-cta__bg { position: absolute; inset: 0; z-index: -1; }
.px-cta__bg .px-glow--flow {
  width: 900px; height: 560px; left: 50%; translate: -50% 0; bottom: -55%; opacity: 0.4;
}
.px-cta__inner { text-align: center; display: grid; justify-items: center; gap: 1.5rem; }
.px-cta__title { font-size: var(--fs-h2); max-width: 18ch; }

/* ==========================================================================
   10. MÉTODO (SCROLL HORIZONTAL)
   Adaptado del patrón "Process Timeline" (21st.dev · @youcefbnm):
   contenedor alto + sticky + desplazamiento en X según progreso de scroll.
   ========================================================================== */
.px-method { position: relative; }
.px-method__track { position: relative; height: 340vh; }
.px-method__sticky {
  position: sticky;
  top: 0;
  height: 100vh;
  display: flex;
  flex-direction: column;
  justify-content: center;
  overflow: hidden;
}
.px-method__head { margin-bottom: clamp(1.5rem, 3vw, 2.5rem); }

.px-method__rail {
  display: flex;
  align-items: center;
  gap: 1rem;
  margin-bottom: 1.5rem;
  font-size: var(--fs-xs);
  letter-spacing: 0.16em;
  text-transform: uppercase;
  font-weight: 700;
  color: var(--px-text-faint);
}
.px-method__bar {
  flex: 1;
  height: 2px;
  background: var(--px-line);
  border-radius: 2px;
  overflow: hidden;
}
.px-method__bar i {
  display: block;
  height: 100%;
  width: 25%;
  background: linear-gradient(90deg, var(--px-flow), var(--px-flow-300));
  transform-origin: 0 50%;
  transition: transform 120ms linear;
}

.px-method__cards {
  display: flex;
  gap: clamp(1rem, 2vw, 1.75rem);
  will-change: transform;
}
.px-method__card {
  flex: 0 0 auto;
  width: min(62%, 620px);
  display: grid;
  grid-template-columns: auto minmax(0, 1fr);
  border: 1px solid var(--px-line);
  border-radius: var(--r-lg);
  background: linear-gradient(150deg, var(--px-acc-tint), rgba(7, 8, 12, 0.6));
  backdrop-filter: blur(6px);
  -webkit-backdrop-filter: blur(6px);
  overflow: hidden;
  transition: border-color var(--dur-base) var(--ease-out), opacity var(--dur-base) var(--ease-out);
}
.px-method__card.is-active { border-color: color-mix(in srgb, var(--px-acc-mid) 42%, transparent); }
.px-method__num {
  padding: clamp(1.4rem, 2vw, 2rem) clamp(1rem, 1.5vw, 1.5rem);
  border-right: 1px solid var(--px-line);
  display: flex;
  align-items: flex-start;
}
.px-method__num span {
  width: 42px;
  height: 42px;
  display: grid;
  place-items: center;
  border-radius: 50%;
  background: color-mix(in srgb, var(--px-acc-deep) 22%, transparent);
  border: 1px solid var(--px-acc-line);
  color: var(--px-flow-300);
  font-weight: 800;
  font-size: var(--fs-sm);
  font-variant-numeric: tabular-nums;
}
.px-method__body { padding: clamp(1.4rem, 2vw, 2.2rem); display: grid; gap: 1.1rem; align-content: start; }
.px-method__body h3 { font-size: clamp(1.4rem, 1.1rem + 1.1vw, 2.1rem); }
.px-method__body p { font-size: var(--fs-sm); color: var(--px-text-soft); }
.px-method__tags { display: flex; flex-wrap: wrap; gap: 0.4rem; }

/* Versión apilada (móvil / sin JS) */
.px-method__stack { display: none; }
.px-method__stepcard {
  display: grid;
  grid-template-columns: auto minmax(0, 1fr);
  gap: 1.1rem;
  padding: 1.5rem 0;
  border-top: 1px solid var(--px-line);
}

/* ==========================================================================
   11. CASOS Y PESTAÑAS
   ========================================================================== */
.px-tabs { display: grid; gap: 1.5rem; }
.px-tablist {
  display: flex;
  gap: 0.25rem;
  padding: 0.3rem;
  border: 1px solid var(--px-line);
  border-radius: var(--r-pill);
  background: var(--px-glass);
  overflow-x: auto;
  scrollbar-width: none;
}
.px-tablist::-webkit-scrollbar { display: none; }
.px-tab {
  flex: 1 0 auto;
  padding: 0.72rem 1.15rem;
  border: 0;
  border-radius: var(--r-pill);
  background: transparent;
  color: var(--px-text-muted);
  font-size: var(--fs-sm);
  font-weight: 700;
  white-space: nowrap;
  cursor: pointer;
  transition: color var(--dur-base) var(--ease-out), background-color var(--dur-base) var(--ease-out);
}
.px-tab:hover { color: var(--px-text); }
.px-tab[aria-selected="true"] {
  background: color-mix(in srgb, var(--px-acc-deep) 24%, transparent);
  color: var(--px-text);
  box-shadow: inset 0 0 0 1px var(--px-acc-line);
}

.px-tabpanel { display: none; }
.px-tabpanel.is-active { display: block; animation: pxFadeUp var(--dur-slow) var(--ease-expo) both; }

.px-case {
  display: grid;
  grid-template-columns: minmax(0, 1fr) minmax(0, 0.85fr);
  border: 1px solid var(--px-line);
  border-radius: var(--r-lg);
  overflow: hidden;
  background: var(--px-glass);
}
.px-case__body { padding: clamp(1.5rem, 1.1rem + 1.4vw, 2.4rem); display: grid; gap: 1.15rem; align-content: start; }
.px-case__aside {
  padding: clamp(1.5rem, 1.1rem + 1.4vw, 2.4rem);
  border-left: 1px solid var(--px-line);
  background: rgba(255,255,255,0.02);
  display: grid;
  gap: 1.25rem;
  align-content: start;
}
.px-case__stat dt {
  font-size: var(--fs-xs);
  letter-spacing: 0.12em;
  text-transform: uppercase;
  color: var(--px-text-faint);
  font-weight: 700;
  margin-bottom: 0.3rem;
}
.px-case__stat dd { margin: 0; font-size: var(--fs-sm); color: var(--px-text-soft); }

/* Marco de plantilla vacía */
.px-blueprint {
  position: relative;
  border: 1px dashed rgba(232,223,201,0.24);
  border-radius: var(--r-lg);
  padding: clamp(1.5rem, 1.1rem + 1.4vw, 2.4rem);
  background:
    repeating-linear-gradient(135deg, rgba(255,255,255,0.016) 0 10px, transparent 10px 20px);
}

/* ==========================================================================
   12. ACORDEÓN / FAQ
   ========================================================================== */
.px-acc { border-top: 1px solid var(--px-line); }
.px-acc__item { border-bottom: 1px solid var(--px-line); }
.px-acc__btn {
  width: 100%;
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 1.5rem;
  padding: 1.35rem 0;
  background: none;
  border: 0;
  text-align: left;
  cursor: pointer;
  font-size: var(--fs-h4);
  font-weight: 700;
  letter-spacing: -0.018em;
  color: var(--px-text);
  transition: color var(--dur-base) var(--ease-out);
}
.px-acc__btn:hover { color: var(--px-flow-300); }
.px-acc__icon {
  position: relative;
  flex-shrink: 0;
  width: 22px;
  height: 22px;
  border-radius: 50%;
  border: 1px solid var(--px-line-strong);
}
.px-acc__icon::before,
.px-acc__icon::after {
  content: "";
  position: absolute;
  top: 50%;
  left: 50%;
  translate: -50% -50%;
  background: var(--px-flow-400);
  transition: transform var(--dur-base) var(--ease-expo), opacity var(--dur-base);
}
.px-acc__icon::before { width: 9px; height: 1.5px; }
.px-acc__icon::after  { width: 1.5px; height: 9px; }
.px-acc__btn[aria-expanded="true"] .px-acc__icon::after { transform: rotate(90deg); opacity: 0; }

.px-acc__panel {
  overflow: hidden;
  height: 0;
  transition: height var(--dur-base) var(--ease-out);
}
.px-acc__inner { padding: 0 0 1.5rem; max-width: 72ch; }
.px-acc__inner p { font-size: var(--fs-sm); color: var(--px-text-soft); }

.px-bg-ivory .px-acc,
.px-bg-ivory .px-acc__item { border-color: var(--px-line-ink); }
.px-bg-ivory .px-acc__btn { color: var(--px-ink); }
.px-bg-ivory .px-acc__btn:hover { color: var(--px-flow); }
.px-bg-ivory .px-acc__icon { border-color: var(--px-line-ink-str); }
.px-bg-ivory .px-acc__icon::before,
.px-bg-ivory .px-acc__icon::after { background: var(--px-flow); }
.px-bg-ivory .px-acc__inner p { color: var(--px-ink-soft); }

/* ==========================================================================
   13. FORMULARIO
   ========================================================================== */
.px-form { display: grid; gap: 1.15rem; }
.px-form__grid { display: grid; grid-template-columns: repeat(2, minmax(0, 1fr)); gap: 1.15rem; }
.px-field { display: grid; gap: 0.45rem; }
.px-field--full { grid-column: 1 / -1; }

.px-label {
  font-size: var(--fs-xs);
  font-weight: 700;
  letter-spacing: 0.1em;
  text-transform: uppercase;
  color: var(--px-text-muted);
}
.px-label .px-req { color: var(--px-copper-300); margin-left: 0.2em; }

.px-input,
.px-select,
.px-textarea {
  width: 100%;
  padding: 0.9rem 1rem;
  background: rgba(255,255,255,0.035);
  border: 1px solid var(--px-line-strong);
  border-radius: var(--r-md);
  color: var(--px-text);
  font-size: var(--fs-sm);
  transition: border-color var(--dur-base) var(--ease-out),
              background-color var(--dur-base) var(--ease-out),
              box-shadow var(--dur-base) var(--ease-out);
  appearance: none;
}
.px-textarea { min-height: 130px; resize: vertical; line-height: 1.6; }
.px-select {
  background-image: url("data:image/svg+xml,%3Csvg xmlns='http://www.w3.org/2000/svg' width='12' height='8' viewBox='0 0 12 8' fill='none'%3E%3Cpath d='M1 1.5L6 6.5L11 1.5' stroke='%2393A6B2' stroke-width='1.6' stroke-linecap='round' stroke-linejoin='round'/%3E%3C/svg%3E");
  background-repeat: no-repeat;
  background-position: right 1rem center;
  padding-right: 2.5rem;
  cursor: pointer;
}
.px-select option { background: var(--px-navy); color: var(--px-text); }

.px-input::placeholder, .px-textarea::placeholder { color: var(--px-text-faint); }
.px-input:focus, .px-select:focus, .px-textarea:focus {
  outline: none;
  border-color: var(--px-flow-400);
  background: rgba(255,255,255,0.055);
  box-shadow: 0 0 0 3px var(--px-acc-line);
}
.px-input[aria-invalid="true"],
.px-select[aria-invalid="true"],
.px-textarea[aria-invalid="true"] { border-color: var(--px-copper); }

.px-error {
  font-size: var(--fs-xs);
  color: var(--px-copper-300);
  min-height: 0;
  display: none;
}
.px-error.is-visible { display: block; }

.px-check-field {
  display: grid;
  grid-template-columns: auto minmax(0, 1fr);
  gap: 0.75rem;
  align-items: start;
  font-size: var(--fs-xs);
  color: var(--px-text-muted);
  line-height: 1.6;
}
.px-check-field input {
  width: 18px;
  height: 18px;
  margin-top: 0.15rem;
  accent-color: var(--px-flow);
  cursor: pointer;
}
.px-check-field a { color: var(--px-flow-400); text-decoration: underline; text-underline-offset: 2px; }

.px-form__note {
  font-size: var(--fs-xs);
  color: var(--px-text-faint);
  line-height: 1.6;
}

.px-form__success {
  display: none;
  padding: clamp(1.5rem, 1.2rem + 1vw, 2.25rem);
  border: 1px solid color-mix(in srgb, var(--px-acc-mid) 42%, transparent);
  border-radius: var(--r-lg);
  background: var(--px-acc-tint);
}
.px-form__success.is-visible { display: block; animation: pxFadeUp var(--dur-slow) var(--ease-expo) both; }

/* ==========================================================================
   14. FOOTER
   ========================================================================== */
.px-footer {
  position: relative;
  background: var(--px-navy-900);
  border-top: 1px solid var(--px-line);
  padding-top: clamp(3.5rem, 6vw, 5.5rem);
  overflow: hidden;
}
.px-footer__grid {
  display: grid;
  grid-template-columns: minmax(0, 1.4fr) repeat(3, minmax(0, 1fr));
  gap: clamp(2rem, 4vw, 3.5rem);
  padding-bottom: clamp(2.5rem, 4vw, 3.5rem);
}
.px-footer__brand { display: grid; gap: 1.25rem; align-content: start; max-width: 34ch; }
.px-footer__title {
  font-size: var(--fs-eyebrow);
  font-weight: 700;
  letter-spacing: 0.2em;
  text-transform: uppercase;
  color: var(--px-text-faint);
  margin-bottom: 1.1rem;
}
.px-footer__list { list-style: none; margin: 0; padding: 0; display: grid; gap: 0.7rem; }
.px-footer__list a {
  font-size: var(--fs-sm);
  color: var(--px-text-muted);
  transition: color var(--dur-base) var(--ease-out);
}
.px-footer__list a:hover { color: var(--px-flow-300); }

.px-footer__bar {
  display: flex;
  flex-wrap: wrap;
  align-items: center;
  justify-content: space-between;
  gap: 1rem;
  padding: 1.5rem 0;
  border-top: 1px solid var(--px-line);
  font-size: var(--fs-xs);
  color: var(--px-text-faint);
}
.px-footer__bar ul { display: flex; flex-wrap: wrap; gap: 1.25rem; list-style: none; margin: 0; padding: 0; }
.px-footer__bar a:hover { color: var(--px-text-soft); }

.px-footer__wordmark {
  font-size: clamp(3.5rem, 14vw, 12rem);
  font-weight: 800;
  letter-spacing: -0.05em;
  line-height: 0.8;
  color: transparent;
  -webkit-text-stroke: 1px rgba(232,223,201,0.09);
  text-align: center;
  user-select: none;
  padding-bottom: 0.08em;
  margin: 0;
}

/* ==========================================================================
   15. ANIMACIÓN Y MOTION
   ========================================================================== */
@keyframes pxFadeUp {
  from { opacity: 0; transform: translateY(18px); }
  to   { opacity: 1; transform: none; }
}

/* Revelado por scroll */
[data-reveal] {
  opacity: 0;
  transform: translateY(24px);
  transition: opacity var(--dur-reveal) var(--ease-expo),
              transform var(--dur-reveal) var(--ease-expo);
  transition-delay: var(--reveal-delay, 0ms);
}
[data-reveal].is-revealed { opacity: 1; transform: none; }

[data-reveal="fade"]  { transform: none; }
[data-reveal="left"]  { transform: translateX(-24px); }
[data-reveal="right"] { transform: translateX(24px); }
[data-reveal="scale"] { transform: scale(0.97); }

/* Revelado tipográfico por línea/palabra (patrón adaptado de
   "Text Reveal (Mask)" · 21st.dev · @soralabs) */
.px-split { display: block; }
/* El padding/margen compensados dan aire a los descendentes (g, p, y, j)
   sin romper el efecto de máscara. */
.px-split__line {
  display: block;
  overflow: hidden;
  padding-bottom: 0.16em;
  margin-bottom: -0.16em;
}
.px-split__unit {
  display: inline-block;
  transform: translateY(110%);
  transition: transform var(--dur-reveal) var(--ease-expo);
  transition-delay: var(--unit-delay, 0ms);
  will-change: transform;
  backface-visibility: hidden;
}
.px-split__line > .px-split__unit { display: block; }
.px-split.is-revealed .px-split__unit { transform: translateY(0); }
.px-split__unit + .px-split__unit { margin-left: 0; }
.px-split__word { display: inline-block; }
.px-split__word:not(:last-child) { margin-right: 0.26em; }

/* Lectura progresiva ligada al scroll */
.px-readword {
  color: rgba(147, 166, 178, 0.22);
  transition: color 220ms linear;
}
.px-readword.is-lit { color: var(--px-text); }
.px-readword.is-lit.px-readword--accent { color: var(--px-flow-300); }
.px-bg-ivory .px-readword { color: rgba(16, 38, 58, 0.16); }
.px-bg-ivory .px-readword.is-lit { color: var(--px-ink); }
.px-bg-ivory .px-readword.is-lit.px-readword--accent { color: var(--px-flow); }

/* Trazo del diagrama */
.px-draw {
  stroke-dasharray: var(--len, 400);
  stroke-dashoffset: var(--len, 400);
  transition: stroke-dashoffset 1.5s var(--ease-out);
  transition-delay: var(--draw-delay, 0ms);
}
.is-revealed .px-draw,
.px-draw.is-revealed { stroke-dashoffset: 0; }

.px-pulse { animation: pxPulse 3.2s var(--ease-inout) infinite; }
@keyframes pxPulse {
  0%, 100% { opacity: 0.35; }
  50%      { opacity: 1; }
}

.px-float { animation: pxFloat 7s var(--ease-inout) infinite; }
@keyframes pxFloat {
  0%, 100% { transform: translateY(0); }
  50%      { transform: translateY(-6px); }
}

/* ==========================================================================
   16. RESPONSIVE
   ========================================================================== */
@media (max-width: 1080px) {
  .px-hero__grid { grid-template-columns: minmax(0, 1fr); }
  .px-hero__panel { order: 2; }
  .px-capstrip { grid-template-columns: repeat(3, minmax(0, 1fr)); }
  .px-footer__grid { grid-template-columns: repeat(2, minmax(0, 1fr)); }
  .px-method__card { width: min(82%, 560px); }
}

@media (max-width: 960px) {
  :root { --header-h: 68px; }
  .px-nav, .px-header__cta .px-btn { display: none; }
  .px-burger { display: inline-flex; }
  .px-section-head--split { grid-template-columns: minmax(0, 1fr); align-items: start; }
  .px-grid--3, .px-grid--4 { grid-template-columns: repeat(2, minmax(0, 1fr)); }
  .px-card--wide { grid-column: span 2; }
  .px-case { grid-template-columns: minmax(0, 1fr); }
  .px-case__aside { border-left: 0; border-top: 1px solid var(--px-line); }
  .px-contrast { grid-template-columns: minmax(0, 1fr); }
  .px-deflist__row { grid-template-columns: minmax(0, 1fr); gap: 0.6rem; }

  /* Método: se apila y se desactiva el scroll horizontal */
  .px-method__track { height: auto; }
  .px-method__sticky { position: static; height: auto; display: block; }
  .px-method__cards, .px-method__rail { display: none; }
  .px-method__stack { display: block; }
}

@media (max-width: 720px) {
  .px-grid--2, .px-grid--3, .px-grid--4 { grid-template-columns: minmax(0, 1fr); }
  .px-card--wide { grid-column: span 1; }
  .px-capstrip { grid-template-columns: repeat(2, minmax(0, 1fr)); }
  .px-form__grid { grid-template-columns: minmax(0, 1fr); }
  .px-footer__grid { grid-template-columns: minmax(0, 1fr); }
  .px-hero__actions .px-btn { width: 100%; }
  .px-statement { max-width: none; }
  .px-tablist { border-radius: var(--r-md); }

  /* En pantallas estrechas el desplazamiento lateral previo al reveal
     provocaría un scroll horizontal momentáneo: se sustituye por vertical. */
  [data-reveal="left"],
  [data-reveal="right"] { transform: translateY(24px); }
}

@media (max-width: 420px) {
  .px-capstrip { grid-template-columns: minmax(0, 1fr); }
}

/* ==========================================================================
   17. ACCESIBILIDAD Y UTILIDADES FINALES
   ========================================================================== */
.px-sr {
  position: absolute;
  width: 1px; height: 1px;
  padding: 0; margin: -1px;
  overflow: hidden;
  clip: rect(0 0 0 0);
  clip-path: inset(50%);
  white-space: nowrap;
  border: 0;
}

.px-hide { display: none !important; }

@media (prefers-reduced-motion: reduce) {
  html { scroll-behavior: auto; }
  /* El ciclo cromático se congela en Verde Flujo, el color oficial de acción */
  :root {
    animation: none !important;
    --px-acc:      #3FC9BC;
    --px-acc-mid:  #39A7A0;
    --px-acc-deep: #1F6F78;
    --px-acc-tint: rgba(57,167,160,0.13);
    --px-acc-line: rgba(57,167,160,0.30);
    --px-acc-glow: rgba(31,111,120,0.62);
  }
  *, *::before, *::after {
    animation-duration: 0.001ms !important;
    animation-iteration-count: 1 !important;
    transition-duration: 0.001ms !important;
    scroll-behavior: auto !important;
  }
  [data-reveal] { opacity: 1 !important; transform: none !important; }
  .px-split__unit { transform: none !important; }
  .px-readword { color: inherit !important; }
  .px-draw { stroke-dashoffset: 0 !important; }
  .px-method__track { height: auto !important; }
  .px-method__sticky { position: static !important; height: auto !important; display: block !important; }
  .px-method__cards, .px-method__rail { display: none !important; }
  .px-method__stack { display: block !important; }
}

@media print {
  .px-header, .px-mobile, .px-burger, .px-cta, .px-footer__wordmark { display: none !important; }
  body { background: #fff; color: #000; }
}