/* ============================================================
   OBRA CORE — obracore.corextech.mx
   Base negra Corex + azul de producto #1649AD (hover #0E327B).
   ============================================================ */

:root {
  --ink-0: #080808;
  --ink-1: #0F0F0F;
  --ink-2: #1E1E1E;
  --graphite: #9A9A9A;
  --graphite-dim: #6B6B6B;
  --paper: #FFFFFF;
  --paper-dim: #CFCFCF;
  --blue: #1649AD;
  --blue-hover: #0E327B;
  --blue-text: #6E97F0;
  --font-sans: "Archivo", system-ui, sans-serif;
  --font-mono: "IBM Plex Mono", ui-monospace, monospace;
  --wrap: 1160px;
}

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

html { scroll-behavior: smooth; }

body {
  background: var(--ink-0);
  color: var(--paper);
  font-family: var(--font-sans);
  font-size: 17px;
  line-height: 1.6;
  -webkit-font-smoothing: antialiased;
}

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

.wrap { max-width: var(--wrap); margin: 0 auto; padding: 0 24px; }

.mono { font-family: var(--font-mono); font-size: 0.78rem; letter-spacing: 0.08em; text-transform: uppercase; }

.dim { color: var(--graphite); }
.blue { color: var(--blue-text); }

/* ---------- Tipografía ---------- */

h1, h2, h3 {
  font-variation-settings: "wdth" 118;
  font-weight: 750;
  line-height: 1.04;
  letter-spacing: -0.01em;
  text-transform: uppercase;
  text-wrap: balance;
}

h1 { font-size: clamp(2.4rem, 5.4vw, 4.4rem); }
h2 { font-size: clamp(1.7rem, 3.4vw, 2.6rem); }
h3 { font-size: clamp(1.05rem, 1.6vw, 1.3rem); line-height: 1.2; }

.eyebrow {
  font-family: var(--font-mono);
  font-size: 0.78rem;
  letter-spacing: 0.22em;
  text-transform: uppercase;
  color: var(--graphite);
  margin-bottom: 1.1rem;
}

.eyebrow::before {
  content: "";
  display: inline-block;
  width: 9px; height: 9px;
  border: 1.5px solid var(--blue-text);
  margin-right: 0.7rem;
  transform: translateY(1px);
}

.eyebrow.light { color: rgba(255, 255, 255, 0.75); }
.eyebrow.light::before { border-color: #fff; }

.lead {
  font-size: clamp(1.05rem, 1.7vw, 1.25rem);
  color: var(--paper-dim);
  max-width: 34em;
  margin-top: 1.4rem;
}

/* ---------- Botones ---------- */

.btn {
  display: inline-block;
  font-family: var(--font-mono);
  font-size: 0.82rem;
  letter-spacing: 0.1em;
  text-transform: uppercase;
  text-decoration: none;
  padding: 0.95rem 1.7rem;
  border: 1px solid transparent;
  transition: background 0.2s ease, color 0.2s ease, border-color 0.2s ease;
}

.btn-blue { background: var(--blue); color: #fff; border-color: var(--blue); }
.btn-blue:hover { background: var(--blue-hover); border-color: var(--blue-hover); }

.btn-ghost { background: transparent; color: var(--paper); border-color: #3A3A3A; }
.btn-ghost:hover { border-color: var(--paper); }

.btn-white { background: #fff; color: var(--blue); border-color: #fff; }
.btn-white:hover { background: var(--paper-dim); border-color: var(--paper-dim); }

.btn-ghost-light { background: transparent; color: #fff; border-color: rgba(255, 255, 255, 0.5); }
.btn-ghost-light:hover { border-color: #fff; }

:focus-visible { outline: 2px solid var(--blue-text); outline-offset: 3px; }

/* ---------- Navegación ---------- */

.nav {
  position: fixed;
  inset: 0 0 auto 0;
  z-index: 50;
  transition: background 0.25s ease, border-color 0.25s ease;
  border-bottom: 1px solid transparent;
}

.nav.scrolled {
  background: rgba(8, 8, 8, 0.88);
  backdrop-filter: blur(12px);
  border-bottom-color: var(--ink-2);
}

.nav-inner {
  max-width: var(--wrap);
  margin: 0 auto;
  padding: 18px 24px;
  display: flex;
  align-items: center;
  gap: 2.4rem;
}

.nav-logo img { height: 30px; width: auto; }

.nav-links { display: flex; gap: 1.9rem; margin-left: auto; }

.nav-links a, .nav-mobile a {
  font-family: var(--font-mono);
  font-size: 0.78rem;
  letter-spacing: 0.12em;
  text-transform: uppercase;
  text-decoration: none;
  color: var(--graphite);
  transition: color 0.2s ease;
}

.nav-links a:hover, .nav-mobile a:hover { color: var(--paper); }

.nav-cta { padding: 0.6rem 1.2rem; }

.nav-toggle {
  display: none;
  background: none;
  border: 0;
  width: 40px; height: 40px;
  margin-left: auto;
  cursor: pointer;
  flex-direction: column;
  justify-content: center;
  gap: 7px;
}

.nav-toggle span {
  display: block;
  height: 2px;
  background: var(--paper);
  transition: transform 0.25s ease;
}

.nav-toggle.open span:first-child { transform: translateY(4.5px) rotate(45deg); }
.nav-toggle.open span:last-child { transform: translateY(-4.5px) rotate(-45deg); }

.nav-mobile {
  display: none;
  flex-direction: column;
  gap: 1.4rem;
  padding: 1.6rem 24px 2.2rem;
  background: rgba(8, 8, 8, 0.97);
  border-bottom: 1px solid var(--ink-2);
}

.nav-mobile.open { display: flex; }

/* ---------- Hero ---------- */

.hero {
  position: relative;
  min-height: 100svh;
  display: flex;
  align-items: center;
  overflow: hidden;
}

.hero-bg {
  position: absolute;
  inset: 0;
  width: 100%;
  height: 100%;
  object-fit: cover;
  object-position: right center;
}

/* Velo de legibilidad: protege el texto sin apagar la imagen */
.hero::before {
  content: "";
  position: absolute;
  inset: 0;
  z-index: 1;
  background: linear-gradient(100deg, rgba(8, 8, 8, 0.92) 26%, rgba(8, 8, 8, 0.5) 48%, rgba(8, 8, 8, 0) 70%);
}

.hero-content {
  position: relative;
  z-index: 2;
  width: 100%;
  padding-top: 90px;
}

.hero-content h1 { max-width: 12em; }

.hero-actions { display: flex; flex-wrap: wrap; gap: 1rem; margin-top: 2.4rem; }

/* ---------- Secciones ---------- */

.section { padding: clamp(4.5rem, 9vw, 8rem) 0; }

.section-line { border-top: 1px solid var(--ink-2); }

.section-head { margin-bottom: clamp(2.4rem, 5vw, 4rem); }

.section-head h2 { margin-top: 0.4rem; }

/* ---------- Plataforma ---------- */

.split {
  display: grid;
  grid-template-columns: 1.1fr 1fr;
  gap: clamp(2rem, 5vw, 5rem);
  align-items: start;
}

.split-copy { display: grid; gap: 1.2rem; color: var(--paper-dim); }

.split-copy strong { color: var(--paper); font-weight: 640; }

/* ---------- Módulos ---------- */

.mod-grid {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 1.2rem;
}

.mod-card {
  border: 1px solid var(--ink-2);
  background: var(--ink-1);
  padding: 2.1rem 1.9rem;
  transition: border-color 0.25s ease, transform 0.25s ease;
}

.mod-card:hover { border-color: var(--blue); transform: translateY(-3px); }

.mod-mark {
  display: block;
  width: 14px; height: 14px;
  border: 2px solid var(--blue-text);
  margin-bottom: 1.6rem;
  transition: background 0.25s ease, transform 0.25s ease;
}

.mod-card:hover .mod-mark { background: var(--blue); border-color: var(--blue); transform: rotate(45deg); }

.mod-card p { color: var(--graphite); margin-top: 0.7rem; }

.mod-next { border-style: dashed; background: transparent; }

.mod-next .mod-mark { border-color: var(--graphite-dim); }

.mod-next h3, .mod-next p { color: var(--graphite-dim); }

/* ---------- Pasos ---------- */

.steps {
  list-style: none;
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 1.2rem;
}

.step {
  border: 1px solid var(--ink-2);
  padding: 2.2rem 2rem;
  transition: border-color 0.25s ease;
}

.step:hover { border-color: var(--graphite-dim); }

.step-num {
  display: block;
  color: var(--blue-text);
  font-size: 1rem;
  margin-bottom: 2.6rem;
}

.step p { color: var(--graphite); margin-top: 0.7rem; }

/* ---------- CTA final ---------- */

.cta-band {
  background: linear-gradient(120deg, var(--blue-hover), var(--blue));
  padding: clamp(4.5rem, 9vw, 7.5rem) 0;
}

.cta-inner h2 { max-width: 18em; }

.cta-inner .hero-actions { margin-top: 2.2rem; }

/* ---------- Footer ---------- */

.footer { border-top: 1px solid var(--ink-2); padding: 2.6rem 0; }

.footer-inner {
  display: flex;
  flex-wrap: wrap;
  align-items: center;
  gap: 1.6rem;
}

.footer-logo { height: 24px; width: auto; }

.footer-links { display: flex; gap: 1.5rem; margin-left: auto; }

.footer-links a {
  font-family: var(--font-mono);
  font-size: 0.74rem;
  letter-spacing: 0.1em;
  text-transform: uppercase;
  color: var(--graphite);
  text-decoration: none;
}

.footer-links a:hover { color: var(--paper); }

.footer-by {
  display: flex;
  align-items: center;
  gap: 0.8rem;
  color: var(--graphite-dim);
}

.footer-by img { height: 16px; width: auto; opacity: 0.8; }

.footer-by a:hover img { opacity: 1; }

.footer-legal { color: var(--graphite-dim); width: 100%; }

/* ---------- Revelado ---------- */

.reveal {
  opacity: 0;
  transform: translateY(22px);
  transition: opacity 0.7s ease, transform 0.7s ease;
}

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

.reveal.d1 { transition-delay: 0.12s; }
.reveal.d2 { transition-delay: 0.24s; }
.reveal.d3 { transition-delay: 0.36s; }

@media (prefers-reduced-motion: reduce) {
  html { scroll-behavior: auto; }
  .reveal { opacity: 1; transform: none; transition: none; }
  .mod-card, .mod-mark, .btn, .step { transition: none; }
}

/* ---------- Responsive ---------- */

@media (max-width: 920px) {
  .split { grid-template-columns: 1fr; }
  .mod-grid { grid-template-columns: 1fr 1fr; }
  .steps { grid-template-columns: 1fr; }
}

@media (max-width: 760px) {
  .nav-links, .nav-cta { display: none; }
  .nav-toggle { display: flex; }
  .hero-bg { opacity: 0.45; }
  .mod-grid { grid-template-columns: 1fr; }
  .footer-links { margin-left: 0; }
}