/* =========================================================
   RejillaDeAcero.mx — Hoja de estilos
   Paleta: azul fuerte y azul aqua para énfasis; gris, blanco y negro de fondo
   ========================================================= */

:root {
  --azul: #0047BB;
  --azul-hover: #00358C;
  --aqua: #14C4D6;
  --negro: #000000;
  --grafito: #23272B;
  --gris: #E4E6E9;
  --gris-linea: #C5CAD0;
  --gris-texto: #5A6169;
  --blanco: #FFFFFF;

  --font-display: "Barlow Condensed", "Arial Narrow", "Roboto Condensed", sans-serif;
  --font-body: "Source Sans 3", "Segoe UI", system-ui, -apple-system, Roboto, Arial, sans-serif;

  --container: 1180px;
  --gutter: clamp(1.1rem, 4vw, 2rem);
  --header-h: 68px;

  box-sizing: border-box;
  padding-top: env(safe-area-inset-top, 0px);
  padding-bottom: env(safe-area-inset-bottom, 0px);
}

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

html {
  scroll-behavior: smooth;
  scroll-padding-top: calc(var(--header-h) + env(safe-area-inset-top, 0px));
  -webkit-text-size-adjust: 100%;
}

body {
  margin: 0;
  font-family: var(--font-body);
  font-size: 1.0625rem;
  line-height: 1.6;
  color: var(--grafito);
  background: var(--blanco);
  text-rendering: optimizeLegibility;
}

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

a { color: var(--azul); text-underline-offset: 3px; }
a:hover { color: var(--azul-hover); }

:focus-visible {
  outline: 3px solid var(--aqua);
  outline-offset: 3px;
}

h1, h2, h3 {
  font-family: var(--font-display);
  font-weight: 700;
  line-height: 1.05;
  letter-spacing: -0.005em;
  color: var(--negro);
  margin: 0 0 0.6em;
}

h2 { font-size: clamp(2rem, 4.2vw, 3rem); }
h3 { font-size: clamp(1.35rem, 2.2vw, 1.6rem); font-weight: 600; }
p  { margin: 0 0 1em; }

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

.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;
}

.skip-link {
  position: absolute; left: 1rem; top: -100px; z-index: 100;
  background: var(--azul); color: var(--blanco);
  padding: .6rem 1rem; font-weight: 700; text-decoration: none;
}
.skip-link:focus { top: 1rem; color: var(--blanco); }

/* ---------- Botones ---------- */
.btn {
  display: inline-flex; align-items: center; justify-content: center;
  min-height: 48px; padding: .75rem 1.5rem;
  font-family: var(--font-display); font-weight: 600;
  font-size: 1.2rem; letter-spacing: .02em;
  text-decoration: none; border: 2px solid transparent;
  transition: background-color .2s ease, color .2s ease, border-color .2s ease;
}
.btn-primary { background: var(--azul); color: var(--blanco); }
.btn-primary:hover { background: var(--azul-hover); color: var(--blanco); }
.btn-ghost { border-color: var(--blanco); color: var(--blanco); }
.btn-ghost:hover { background: var(--blanco); color: var(--negro); }
.btn-light { background: var(--blanco); color: var(--azul); }
.btn-light:hover { background: var(--aqua); color: var(--negro); }

/* ---------- Header ---------- */
.site-header {
  position: sticky; top: env(safe-area-inset-top, 0px); z-index: 50;
  background: var(--negro); color: var(--blanco);
  border-bottom: 3px solid var(--aqua);
}
.header-inner {
  display: flex; align-items: center; justify-content: space-between;
  min-height: var(--header-h); gap: 1rem; position: relative;
}
.brand {
  display: inline-flex; align-items: center; gap: .65rem;
  color: var(--blanco); text-decoration: none;
}
.brand:hover { color: var(--blanco); }
.brand-mark { flex: none; color: var(--blanco); }
.brand-name {
  font-family: var(--font-display); font-weight: 700;
  font-size: 1.45rem; line-height: 1; margin: 0;
}
.brand-tld { color: var(--aqua); }

.menu-toggle { position: absolute; opacity: 0; pointer-events: none; }
.menu-btn { display: none; }

.main-nav ul {
  list-style: none; margin: 0; padding: 0;
  display: flex; align-items: center; gap: .25rem;
}
.main-nav a {
  display: block; padding: .55rem .8rem;
  color: #D5D9DE; text-decoration: none;
  font-weight: 600; font-size: .98rem;
}
.main-nav a:hover { color: var(--blanco); }
.main-nav .nav-cta {
  background: var(--azul); color: var(--blanco);
  margin-left: .5rem; padding-inline: 1.1rem;
}
.main-nav .nav-cta:hover { background: var(--azul-hover); }

/* ---------- Hero ---------- */
.hero {
  position: relative; isolation: isolate;
  min-height: min(88vh, 760px);
  display: flex; align-items: flex-end;
  background: var(--negro); color: var(--blanco);
  overflow: hidden;
}
.hero-bg {
  position: absolute; inset: 0; z-index: -2;
  width: 100%; height: 100%; object-fit: cover;
}
.hero::before {
  content: ""; position: absolute; inset: 0; z-index: -1;
  background:
    linear-gradient(90deg, rgba(0,0,0,.9) 0%, rgba(0,0,0,.72) 45%, rgba(0,0,0,.25) 100%),
    linear-gradient(0deg, rgba(0,0,0,.85) 0%, rgba(0,0,0,0) 55%);
}
.hero-content { padding-block: clamp(4rem, 12vh, 7rem) clamp(2.5rem, 6vh, 4rem); }
.hero h1 {
  color: var(--blanco);
  font-size: clamp(2.7rem, 7.2vw, 5.6rem);
  line-height: .95; max-width: 14ch;
  margin-bottom: .35em;
  text-wrap: balance;
}
.hero-sub {
  font-size: clamp(1.1rem, 1.8vw, 1.3rem);
  max-width: 56ch; color: #D5D9DE; margin-bottom: 1.8rem;
}
.hero-actions { display: flex; flex-wrap: wrap; gap: .8rem; }

/* ---------- Secciones ---------- */
.section { padding-block: clamp(3.5rem, 8vw, 6rem); }
.section-white { background: var(--blanco); }
.section-gray  { background: var(--gris); }
.section-black { background: var(--negro); color: #CDD2D8; }
.section-black h2 { color: var(--blanco); }
.section-black a { color: var(--aqua); }
.section-black a:hover { color: var(--blanco); }
.section-black strong { color: var(--blanco); }

.section-lead {
  font-size: 1.15rem; max-width: 62ch;
  color: var(--gris-texto); margin-bottom: 2.5rem;
}

.split {
  display: grid; grid-template-columns: 5fr 7fr;
  gap: clamp(1.5rem, 5vw, 4.5rem); align-items: start;
}
.split-kicker { font-size: 1.15rem; color: var(--gris-texto); max-width: 34ch; }
.section-black .split-kicker { color: #9EA6AF; }
.prose { max-width: 66ch; }
.prose strong { color: var(--negro); }

.checklist { list-style: none; padding: 0; margin: 1.5rem 0 0; }
.checklist li {
  position: relative; padding: .7rem 0 .7rem 2rem;
  border-top: 1px solid var(--gris-linea);
}
.checklist li:last-child { border-bottom: 1px solid var(--gris-linea); }
.checklist li::before {
  content: ""; position: absolute; left: 0; top: 1.05rem;
  width: 14px; height: 14px; background: var(--aqua);
}

.link-arrow { font-weight: 700; }

/* ---------- Tipos ---------- */
.types {
  display: grid; grid-template-columns: repeat(4, minmax(0, 1fr));
  gap: 2px; background: var(--gris-linea);
  border: 2px solid var(--gris-linea);
}
.type { background: var(--blanco); padding: 1.6rem 1.4rem; }
.type p { margin: 0; color: var(--gris-texto); }
.type-main {
  grid-column: span 4;
  display: grid; grid-template-columns: 5fr 7fr; gap: 1.5rem; align-items: end;
  background: var(--azul); color: #E3F6FA; padding: 2rem 1.8rem;
  border-top: 6px solid var(--aqua);
}
.type-main h3 { color: var(--blanco); font-size: clamp(1.8rem, 3.4vw, 2.4rem); margin: 0; }
.type-main p { color: #E3F6FA; font-size: 1.1rem; }

/* ---------- Aplicaciones ---------- */
.apps { list-style: none; margin: 0; padding: 0; }
.apps li {
  padding: 1rem 0 1rem 1.25rem;
  border-left: 4px solid var(--aqua);
  background: var(--blanco); margin-bottom: .6rem;
  padding-right: 1rem;
}
.apps strong { color: var(--negro); display: block; }
.apps-link { margin-top: 1.5rem; font-weight: 600; }

/* ---------- Pasos ---------- */
.steps {
  list-style: none; counter-reset: paso; margin: 0; padding: 0;
  display: grid; grid-template-columns: repeat(4, minmax(0, 1fr)); gap: 2rem;
}
.steps li { counter-increment: paso; border-top: 4px solid var(--aqua); padding-top: 1.1rem; }
.steps li::before {
  content: counter(paso);
  display: block; font-family: var(--font-display); font-weight: 700;
  font-size: 3rem; line-height: 1; color: var(--azul); margin-bottom: .5rem;
}
.steps p { color: var(--gris-texto); margin: 0; }

/* ---------- FAQ ---------- */
.faq-wrap { max-width: 900px; }
.faq { border-top: 2px solid var(--negro); }
.faq details { border-bottom: 1px solid var(--gris-linea); background: transparent; }
.faq summary {
  cursor: pointer; list-style: none; position: relative;
  padding: 1.2rem 3rem 1.2rem 0;
  font-weight: 700; font-size: 1.12rem; color: var(--negro);
}
.faq summary::-webkit-details-marker { display: none; }
.faq summary::after {
  content: ""; position: absolute; right: .4rem; top: 50%;
  width: 14px; height: 14px; margin-top: -9px;
  border-right: 3px solid var(--azul); border-bottom: 3px solid var(--azul);
  transform: rotate(45deg); transition: transform .2s ease;
}
.faq details[open] summary::after { transform: rotate(-135deg); margin-top: -3px; }
.faq summary:hover { color: var(--azul); }
.faq details p { padding: 0 3rem 1.3rem 0; margin: 0; max-width: 72ch; }

/* ---------- CTA ---------- */
.cta { background: var(--azul); color: #E3F6FA; padding-block: clamp(3rem, 7vw, 5rem); border-top: 6px solid var(--aqua); }
.cta-inner { display: flex; align-items: center; justify-content: space-between; gap: 2rem; }
.cta h2 { color: var(--blanco); margin-bottom: .35em; max-width: 20ch; }
.cta p { margin: 0; font-size: 1.15rem; max-width: 52ch; }
.cta .btn { flex: none; }

/* ---------- Footer ---------- */
.site-footer { background: var(--negro); color: #9EA6AF; padding-top: 3.5rem; font-size: .98rem; }
.site-footer a { color: #D5D9DE; }
.site-footer a:hover { color: var(--blanco); }
.footer-grid { display: grid; grid-template-columns: 2fr 1fr 1.3fr; gap: 2.5rem; padding-bottom: 2.5rem; }
.footer-brand .brand-name { color: var(--blanco); margin-bottom: .8rem; }
.footer-title {
  font-size: 1.25rem; color: var(--blanco); margin-bottom: .8rem;
}
.site-footer ul { list-style: none; padding: 0; margin: 0; }
.site-footer li { margin-bottom: .45rem; }
.footer-bottom { border-top: 1px solid #2E3338; padding-block: 1.3rem; font-size: .88rem; }
.footer-bottom p { margin: 0; }

/* =========================================================
   Responsivo
   ========================================================= */
@media (max-width: 1024px) {
  .types { grid-template-columns: repeat(2, minmax(0, 1fr)); }
  .type-main { grid-column: span 2; grid-template-columns: 1fr; gap: .8rem; }
  .steps { grid-template-columns: repeat(2, minmax(0, 1fr)); }
}

@media (max-width: 860px) {
  /* Menú móvil sin JavaScript */
  .menu-btn {
    display: inline-flex; align-items: center; justify-content: center;
    width: 48px; height: 48px; cursor: pointer;
  }
  .menu-icon, .menu-icon::before, .menu-icon::after {
    display: block; width: 24px; height: 3px; background: var(--blanco);
    position: relative; transition: transform .2s ease, background-color .2s ease;
  }
  .menu-icon::before, .menu-icon::after { content: ""; position: absolute; left: 0; }
  .menu-icon::before { top: -8px; }
  .menu-icon::after { top: 8px; }
  .menu-toggle:checked + .menu-btn .menu-icon { background: transparent; }
  .menu-toggle:checked + .menu-btn .menu-icon::before { transform: translateY(8px) rotate(45deg); }
  .menu-toggle:checked + .menu-btn .menu-icon::after { transform: translateY(-8px) rotate(-45deg); }
  .menu-toggle:focus-visible + .menu-btn { outline: 3px solid var(--aqua); outline-offset: 2px; }

  .main-nav {
    display: none; position: absolute; top: 100%; left: 0; right: 0;
    background: var(--negro); border-bottom: 3px solid var(--aqua);
    padding: .5rem var(--gutter) 1.2rem;
  }
  .menu-toggle:checked ~ .main-nav { display: block; }
  .main-nav ul { flex-direction: column; align-items: stretch; gap: 0; }
  .main-nav a { padding: .9rem 0; font-size: 1.1rem; border-bottom: 1px solid #22262A; }
  .main-nav .nav-cta { margin: 1rem 0 0; text-align: center; padding: .9rem; border-bottom: 0; }

  .split { grid-template-columns: 1fr; }
  .cta-inner { flex-direction: column; align-items: flex-start; }
  .footer-grid { grid-template-columns: 1fr; gap: 2rem; }
}

@media (max-width: 600px) {
  body { font-size: 1rem; }
  .hero { min-height: 92vh; }
  .hero-actions .btn { width: 100%; }
  .types { grid-template-columns: 1fr; }
  .type-main { grid-column: span 1; }
  .steps { grid-template-columns: 1fr; gap: 1.6rem; }
  .faq summary { padding-right: 2.5rem; }
  .faq details p { padding-right: 0; }
  .cta .btn { width: 100%; }
}

@media (prefers-reduced-motion: reduce) {
  html { scroll-behavior: auto; }
  *, *::before, *::after { transition: none !important; animation: none !important; }
}

@media print {
  .site-header, .cta, .hero-bg, .hero::before { display: none; }
  .hero { color: var(--negro); background: none; min-height: 0; }
  .hero h1 { color: var(--negro); }
}