/* ==========================================================================
   Base — reset, tipografía, layout, header, footer
   ========================================================================== */

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

html {
  scroll-behavior: smooth;
  -webkit-text-size-adjust: 100%;
}

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

body {
  margin: 0;
  font-family: var(--font-body);
  font-size: var(--fs-base);
  line-height: var(--lh-normal);
  color: var(--color-text);
  background: var(--color-bg);
  -webkit-font-smoothing: antialiased;
  overflow-x: hidden;
}

body.no-scroll { overflow: hidden; }

img, svg, video { max-width: 100%; display: block; }

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

ul, ol { margin: 0; padding: 0; list-style: none; }

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

button { cursor: pointer; }

h1, h2, h3, h4, h5, p, figure { margin: 0; }

h1, h2, h3, h4 {
  font-family: var(--font-display);
  font-weight: var(--fw-semibold);
  line-height: var(--lh-tight);
  color: var(--color-primary-dark);
}

:focus-visible {
  outline: none;
  box-shadow: var(--shadow-focus);
  border-radius: var(--radius-sm);
}

.skip-link {
  position: absolute;
  left: -9999px;
  top: 0;
  background: var(--color-primary-dark);
  color: #fff;
  padding: var(--space-3) var(--space-5);
  z-index: var(--z-modal);
  border-radius: 0 0 var(--radius-sm) 0;
}

.skip-link:focus {
  left: 0;
}

/* --- Contenedores --- */
.container {
  width: 100%;
  max-width: var(--container-max);
  margin-inline: auto;
  padding-inline: var(--container-pad);
}

.container--narrow {
  max-width: var(--container-narrow);
}

.section {
  padding-block: var(--space-10);
}

.section--tight { padding-block: var(--space-8); }

.section--alt {
  background: linear-gradient(180deg, var(--color-surface) 0, var(--color-bg-alt) 70px, var(--color-bg-alt) calc(100% - 70px), var(--color-surface) 100%);
}

.section--dark {
  position: relative;
  isolation: isolate;
  overflow: hidden;
  padding-block: 220px;
  /* Transición en varias etapas (blanco -> verde-teal muy pálido -> verde oscuro)
     para suavizar el cambio de luminosidad. El tono intermedio reutiliza
     --color-teal-50, ya usado en el resto del sitio (no es un color nuevo).
     Interpolación en sRGB estándar (sin "in oklch"): entre blanco y un tono
     casi sin saturación, la interpolación polar de OKLCH puede generar un
     tinte fantasma (rosado/amarillento) por inestabilidad del ángulo de matiz. */
  background: linear-gradient(
    180deg,
    var(--color-surface) 0,
    var(--color-teal-50) 90px,
    var(--color-teal-700) 200px,
    var(--color-teal-700) calc(100% - 200px),
    var(--color-teal-50) calc(100% - 90px),
    var(--color-surface) 100%
  );
  color: #fff;
}

/* Ruido sutil para romper el banding visible en degradados oscuros amplios
   (limitación de precisión de color de 8 bits, no un error del degradado en sí). */
.section--dark::before {
  content: "";
  position: absolute;
  inset: 0;
  z-index: 0;
  background-image: url("data:image/svg+xml;utf8,<svg xmlns='http://www.w3.org/2000/svg'><filter id='n'><feTurbulence type='fractalNoise' baseFrequency='0.85' numOctaves='2' stitchTiles='stitch'/></filter><rect width='100%25' height='100%25' filter='url(%23n)'/></svg>");
  opacity: 0.035;
  mix-blend-mode: overlay;
  pointer-events: none;
}

.section--dark > .container {
  position: relative;
  z-index: 1;
}
.section--dark h2, .section--dark h3 { color: #fff; }
/* Las tarjetas claras (stat-box, doc-card, price-card...) dentro de una
   sección oscura conservan su propio color de texto oscuro. */
.section--dark .stat-box h3,
.section--dark .stat-box p { color: initial; }
.section--dark .stat-box h3 { color: var(--color-primary-dark); }
.section--dark .stat-box p { color: var(--color-text-soft); }
.section--dark .isak-collage__note { color: rgba(255, 255, 255, 0.6); }

.section__head {
  max-width: 660px;
  margin-bottom: var(--space-8);
}

.section__head--center {
  margin-inline: auto;
  text-align: center;
}

.eyebrow {
  display: inline-flex;
  align-items: center;
  gap: var(--space-2);
  font-size: var(--fs-xs);
  font-weight: var(--fw-semibold);
  letter-spacing: 0.08em;
  text-transform: uppercase;
  color: var(--color-accent);
  margin-bottom: var(--space-3);
}

.eyebrow::before {
  content: "";
  width: 22px;
  height: 2px;
  background: var(--color-accent);
  display: inline-block;
}

.section__title {
  font-size: var(--fs-2xl);
  margin-bottom: var(--space-4);
}

.section__lead {
  font-size: var(--fs-md);
  color: var(--color-text-soft);
  line-height: var(--lh-snug);
}

.section--dark .section__lead { color: rgba(255,255,255,0.78); }

.section--dark .empty-state {
  color: rgba(255, 255, 255, 0.7);
  border-color: rgba(255, 255, 255, 0.25);
}
.section--dark .empty-state svg { color: var(--color-accent-light); }

/* --- Fondos con tinte / degradado por sección --- */
.section--tint-green {
  background: linear-gradient(180deg, var(--color-surface) 0, var(--color-green-50) 90px, var(--color-green-50) 55%, var(--color-surface) calc(100% - 60px));
}

.section--tint-gold {
  background: linear-gradient(180deg, var(--color-surface) 0, var(--color-gold-100) 90px, var(--color-gold-100) 55%, var(--color-surface) calc(100% - 60px));
}

.section--tint-teal {
  background: linear-gradient(180deg, var(--color-surface) 0, var(--color-teal-50) 90px, var(--color-teal-50) 55%, var(--color-surface) calc(100% - 60px));
}

.section--mesh-green-gold {
  background:
    radial-gradient(620px circle at 10% 10%, rgba(23, 77, 64, 0.09), transparent 60%),
    radial-gradient(520px circle at 92% 88%, rgba(212, 175, 106, 0.16), transparent 55%),
    var(--color-surface);
}

.section--mesh-gold-teal {
  background:
    radial-gradient(560px circle at 90% 8%, rgba(212, 175, 106, 0.14), transparent 55%),
    radial-gradient(620px circle at 6% 92%, rgba(26, 82, 83, 0.12), transparent 60%),
    var(--color-surface);
}

/* ==========================================================================
   Header / navegación
   ========================================================================== */

.site-header {
  position: sticky;
  top: 0;
  z-index: var(--z-nav);
  background: rgba(255, 255, 255, 0.94);
  backdrop-filter: blur(10px);
  border-bottom: 1px solid transparent;
  transition: border-color var(--duration-base) var(--ease-standard), box-shadow var(--duration-base) var(--ease-standard);
}

.site-header.is-scrolled {
  border-bottom-color: var(--color-border);
  box-shadow: var(--shadow-sm);
}

.nav {
  display: flex;
  align-items: center;
  justify-content: space-between;
  height: var(--header-height);
  gap: var(--space-4);
}

.nav__brand {
  display: flex;
  align-items: center;
  gap: var(--space-2);
  flex-shrink: 0;
}

.nav__brand img {
  height: 44px;
  width: auto;
}

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

.nav__brand-name {
  font-family: var(--font-display);
  font-weight: var(--fw-semibold);
  font-size: var(--fs-sm);
  color: var(--color-primary-dark);
  white-space: nowrap;
}

.nav__brand-tag {
  font-size: var(--fs-2xs);
  color: var(--color-text-muted);
  white-space: nowrap;
}

.nav__list {
  display: none;
}

.nav__link {
  position: relative;
  font-size: var(--fs-sm);
  font-weight: var(--fw-medium);
  color: var(--color-text-soft);
  padding: var(--space-2) 0;
  transition: color var(--duration-fast) var(--ease-standard);
}

.nav__link:hover,
.nav__link:focus-visible {
  color: var(--color-primary);
}

.nav__link[aria-current="page"] {
  color: var(--color-primary);
}

.nav__link[aria-current="page"]::after {
  content: "";
  position: absolute;
  left: 0;
  right: 0;
  bottom: -3px;
  height: 2px;
  background: var(--color-accent);
  border-radius: var(--radius-pill);
}

.nav__actions {
  display: flex;
  align-items: center;
  gap: var(--space-3);
}

.nav__actions .nav__whatsapp {
  display: none;
}

.nav__toggle {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  width: 44px;
  height: 44px;
  background: transparent;
  border: 1px solid var(--color-border);
  border-radius: var(--radius-md);
}

.nav__toggle-bars {
  position: relative;
  width: 20px;
  height: 14px;
}

.nav__toggle-bars span {
  position: absolute;
  left: 0;
  width: 100%;
  height: 2px;
  background: var(--color-primary-dark);
  border-radius: var(--radius-pill);
  transition: transform var(--duration-base) var(--ease-standard), opacity var(--duration-base) var(--ease-standard), top var(--duration-base) var(--ease-standard);
}

.nav__toggle-bars span:nth-child(1) { top: 0; }
.nav__toggle-bars span:nth-child(2) { top: 6px; }
.nav__toggle-bars span:nth-child(3) { top: 12px; }

.nav__toggle[aria-expanded="true"] .nav__toggle-bars span:nth-child(1) {
  top: 6px;
  transform: rotate(45deg);
}
.nav__toggle[aria-expanded="true"] .nav__toggle-bars span:nth-child(2) {
  opacity: 0;
}
.nav__toggle[aria-expanded="true"] .nav__toggle-bars span:nth-child(3) {
  top: 6px;
  transform: rotate(-45deg);
}

.mobile-menu {
  position: fixed;
  inset: 0;
  top: var(--header-height);
  background: var(--color-surface);
  z-index: var(--z-overlay);
  transform: translateY(-8px);
  opacity: 0;
  visibility: hidden;
  transition: opacity var(--duration-base) var(--ease-standard), transform var(--duration-base) var(--ease-standard), visibility var(--duration-base);
  overflow-y: auto;
}

.mobile-menu.is-open {
  opacity: 1;
  visibility: visible;
  transform: translateY(0);
}

.mobile-menu__list {
  display: flex;
  flex-direction: column;
  padding: var(--space-6) var(--container-pad);
  gap: var(--space-1);
}

.mobile-menu__link {
  display: block;
  padding: var(--space-4) 0;
  font-size: var(--fs-lg);
  font-family: var(--font-display);
  font-weight: var(--fw-medium);
  color: var(--color-primary-dark);
  border-bottom: 1px solid var(--color-border);
}

.mobile-menu__footer {
  padding: var(--space-6) var(--container-pad) var(--space-9);
  display: flex;
  flex-direction: column;
  gap: var(--space-4);
}

.mobile-menu__social {
  display: flex;
  gap: var(--space-4);
  font-size: var(--fs-sm);
  color: var(--color-text-muted);
}

@media (min-width: 1024px) {
  .nav__list {
    display: flex;
    align-items: center;
    gap: var(--space-3);
  }

  .nav__actions .nav__whatsapp {
    display: inline-flex;
  }

  .nav__toggle {
    display: none;
  }

  .mobile-menu {
    display: none;
  }
}

/* ==========================================================================
   Footer
   ========================================================================== */

.site-footer {
  background: var(--color-charcoal-900);
  color: rgba(255, 255, 255, 0.82);
  padding-block: var(--space-9) var(--space-6);
}

.footer__grid {
  display: grid;
  gap: var(--space-8);
  grid-template-columns: 1fr;
  padding-bottom: var(--space-8);
  border-bottom: 1px solid rgba(255, 255, 255, 0.12);
}

.footer__brand img {
  height: 48px;
  margin-bottom: var(--space-4);
}

.footer__brand p {
  color: rgba(255, 255, 255, 0.6);
  font-size: var(--fs-sm);
  max-width: 32ch;
}

.footer__heading {
  font-family: var(--font-body);
  font-size: var(--fs-xs);
  text-transform: uppercase;
  letter-spacing: 0.08em;
  color: var(--color-accent-light);
  margin-bottom: var(--space-4);
}

.footer__list {
  display: flex;
  flex-direction: column;
  gap: var(--space-3);
  font-size: var(--fs-sm);
}

.footer__list a:hover { color: #fff; }

.footer__bottom {
  padding-top: var(--space-6);
  display: flex;
  flex-direction: column;
  gap: var(--space-3);
  font-size: var(--fs-xs);
  color: rgba(255, 255, 255, 0.5);
}

@media (min-width: 768px) {
  .footer__grid {
    grid-template-columns: 1.4fr 1fr 1fr 1fr;
  }

  .footer__bottom {
    flex-direction: row;
    justify-content: space-between;
  }
}

/* ==========================================================================
   Utilidades de layout
   ========================================================================== */

.grid { display: grid; gap: var(--space-6); }
.stack { display: flex; flex-direction: column; gap: var(--space-4); }
.cluster { display: flex; flex-wrap: wrap; gap: var(--space-3); align-items: center; }
.text-center { text-align: center; }
.sr-only {
  position: absolute;
  width: 1px; height: 1px;
  padding: 0; margin: -1px;
  overflow: hidden;
  clip: rect(0,0,0,0);
  white-space: nowrap;
  border: 0;
}

.page-hero {
  padding-block: var(--space-9) var(--space-8);
  background: var(--color-bg-alt);
  border-bottom: 1px solid var(--color-border);
}

.page-hero__title { font-size: var(--fs-2xl); }
.page-hero__lead {
  margin-top: var(--space-3);
  color: var(--color-text-soft);
  max-width: 62ch;
  font-size: var(--fs-md);
}

.breadcrumb {
  font-size: var(--fs-xs);
  color: var(--color-text-muted);
  margin-bottom: var(--space-4);
}

.breadcrumb a:hover { color: var(--color-primary); }