/* ===================================================================
   AIENGI — Design system (ver branding.md §12)
   Paleta monocromática + Signal quirúrgico. Editorial, angular, sobrio.
   =================================================================== */
:root {
  /* Colores */
  --color-ink: #0E0E10;
  --color-bone: #FAFAF7;
  --color-pure: #FFFFFF;
  --color-graphite: #5A5A60;
  --color-mist: #D6D6D1;
  --color-fog: #EDEDE8;
  --color-signal: #0044FF;
  --color-plasma: #C8FF3D;

  /* Tipografía */
  --font-display: 'Inter Tight', system-ui, sans-serif;
  --font-body: 'Inter', system-ui, sans-serif;
  --font-mono: 'JetBrains Mono', ui-monospace, monospace;

  /* Escala */
  --text-hero: clamp(2.1rem, 4vw, 3.4rem);
  --text-h2: clamp(1.5rem, 2.6vw, 2rem);
  --text-h3: 1.15rem;
  --text-lead: clamp(1rem, 1.3vw, 1.2rem);
  --text-kicker: 0.72rem;

  /* Espacio */
  --space-6: 24px; --space-8: 32px; --space-12: 48px;
  --space-16: 64px; --space-24: 96px; --space-32: 128px;
  --section-pad: clamp(3rem, 6vw, 4.5rem);

  /* Radios */
  --radius-sm: 4px;
  --radius-md: 8px;
  --radius-lg: 16px;

  /* Sombras (sutilísimas) */
  --shadow-sm: 0 1px 2px rgba(14, 14, 16, 0.04);
  --shadow-md: 0 4px 16px rgba(14, 14, 16, 0.06);
  --shadow-lg: 0 16px 48px rgba(14, 14, 16, 0.08);

  /* Motion */
  --ease-out: cubic-bezier(0.22, 1, 0.36, 1);
  --ease-inout: cubic-bezier(0.4, 0, 0.2, 1);
  --dur-fast: 150ms;
  --dur-base: 250ms;
  --dur-slow: 500ms;

  /* Layout */
  --container-max: 1280px;
  --container-pad: clamp(1.5rem, 4vw, 3rem);
}

/* ===== Reset / base ===== */
*, *::before, *::after { box-sizing: border-box; }
html { scroll-behavior: smooth; -webkit-text-size-adjust: 100%; }

body {
  margin: 0;
  font-family: var(--font-body);
  font-size: 1rem;
  line-height: 1.6;
  color: var(--color-ink);
  background: var(--color-bone);
  -webkit-font-smoothing: antialiased;
  text-rendering: optimizeLegibility;
}

h1, h2, h3 { font-family: var(--font-display); font-weight: 500; margin: 0; }
h1 { font-size: var(--text-hero); line-height: 1.05; letter-spacing: -0.02em; font-weight: 600; }
h2 { font-size: var(--text-h2); line-height: 1.15; letter-spacing: -0.015em; font-weight: 600; }
h3 { font-size: var(--text-h3); line-height: 1.3; letter-spacing: -0.01em; }
p { margin: 0; }
a { color: inherit; text-decoration: none; }
img { max-width: 100%; height: auto; display: block; }

.container {
  width: 100%;
  max-width: var(--container-max);
  margin: 0 auto;
  padding-inline: var(--container-pad);
}

/* ===== Kicker (etiqueta uppercase con línea blueprint) ===== */
.kicker {
  display: inline-flex; align-items: center; gap: 0.7rem;
  font-family: var(--font-mono);
  font-size: var(--text-kicker);
  text-transform: uppercase;
  letter-spacing: 0.25em;
  color: var(--color-graphite);
  margin: 0 0 var(--space-6);
}
.kicker::before {
  content: ""; width: 24px; height: 1px; flex: none;
  background: var(--kicker-line, var(--color-signal));
}
.kicker-light { color: rgba(242, 242, 238, 0.65); --kicker-line: var(--color-plasma); }

/* ===== Accesibilidad ===== */
.skip-link {
  position: absolute; left: -999px; top: 0; z-index: 100;
  background: var(--color-ink); color: var(--color-bone);
  padding: 0.7rem 1.1rem; border-radius: 0 0 var(--radius-md) 0;
}
.skip-link:focus { left: 0; }
:focus-visible { outline: 2px solid var(--color-signal); outline-offset: 2px; border-radius: var(--radius-sm); }

/* ===== Botones ===== */
.btn {
  display: inline-flex; align-items: center; justify-content: center;
  min-height: 44px;
  font-family: var(--font-body); font-weight: 500; font-size: 0.95rem;
  padding: 14px 28px; border-radius: var(--radius-md);
  border: 1px solid transparent; cursor: pointer;
  transition: transform var(--dur-fast) var(--ease-out),
              background var(--dur-base) var(--ease-out),
              box-shadow var(--dur-base) var(--ease-out),
              border-color var(--dur-base) var(--ease-out);
}
.btn-primary { background: var(--color-ink); color: var(--color-bone); }
.btn-primary:hover { transform: translateY(-1px); box-shadow: var(--shadow-md); }
.btn-secondary { background: transparent; color: var(--color-ink); border-color: var(--color-mist); }
.btn-secondary:hover { background: var(--color-fog); }
.btn-block { width: 100%; }

/* CTA dark: botón en Bone */
.cta .btn-primary { background: var(--color-bone); color: var(--color-ink); }

/* Link con flecha (acción inline en Signal) */
.link-arrow {
  display: inline-flex; align-items: center; gap: 0.4em;
  font-size: 0.9rem; font-weight: 500; color: var(--color-signal);
  margin-top: auto;
}
.link-arrow::after { content: "→"; transition: transform var(--dur-base) var(--ease-out); }
.link-arrow:hover::after { transform: translateX(4px); }

/* ===== Header ===== */
.site-header {
  position: sticky; top: 0; z-index: 50;
  background: color-mix(in srgb, var(--color-bone) 82%, transparent);
  border-bottom: 1px solid var(--color-mist);
  transition: box-shadow var(--dur-base) var(--ease-out);
}
.site-header.scrolled { backdrop-filter: saturate(180%) blur(12px); box-shadow: var(--shadow-sm); }
.header-inner { display: flex; align-items: center; justify-content: space-between; height: 68px; }

/* Logo real enmascarado (Efecto 1: el color se controla por CSS y cambia por sección) */
.brand { display: inline-flex; align-items: center; }
.brand-logo {
  display: block;
  width: 60px; height: 46px;
  background-color: var(--color-ink);
  -webkit-mask: url('img/aiengi_pure_transparent.png') left center / contain no-repeat;
          mask: url('img/aiengi_pure_transparent.png') left center / contain no-repeat;
  transition: background-color 400ms var(--ease-out), transform var(--dur-base) var(--ease-out);
}
.brand:hover .brand-logo { transform: scale(1.02); }

.nav-menu { list-style: none; display: flex; align-items: center; gap: var(--space-8); margin: 0; padding: 0; }
.nav-menu a {
  font-family: var(--font-mono); font-size: 0.72rem; text-transform: uppercase;
  letter-spacing: 0.16em; color: var(--color-graphite);
  transition: color var(--dur-base) var(--ease-out);
}
.nav-menu a:hover { color: var(--color-ink); }
.nav-cta {
  color: var(--color-ink) !important;
  border-bottom: 1px solid var(--color-ink); padding-bottom: 2px;
}

.nav-toggle {
  display: none; flex-direction: column; gap: 5px;
  width: 44px; height: 44px; align-items: center; justify-content: center;
  background: none; border: 0; cursor: pointer;
}
.nav-toggle span { width: 22px; height: 1.5px; background: var(--color-ink); transition: var(--dur-base); }

/* ===== Hero ===== */
.hero { padding-top: clamp(2.25rem, 4vw, 3.25rem); padding-bottom: var(--section-pad); }
.hero-inner {
  display: grid; grid-template-columns: 1.2fr 0.8fr; gap: var(--space-12);
  align-items: center;
}
.hero-text { max-width: 40ch; }
.hero h1 { margin-bottom: var(--space-6); }
.lead { font-size: var(--text-lead); line-height: 1.5; color: var(--color-graphite); }
.hero .lead { max-width: 52ch; }
.hero-actions { display: flex; flex-wrap: wrap; gap: var(--space-6); margin-top: var(--space-8); }

/* Visual del logo: contenedor = imán (translate), img = respiración (scale) */
.hero-visual { display: flex; justify-content: center; }
.hero-logo { transition: transform 200ms var(--ease-out); will-change: transform; }
.hero-logo-img {
  width: min(320px, 80%);
  animation: breathe 5s var(--ease-inout) infinite;
}
@keyframes breathe {
  0%, 100% { opacity: 1; transform: scale(1); }
  50% { opacity: 0.92; transform: scale(1.008); }
}

/* ===== Proof bar ===== */
.proof { border-block: 1px solid var(--color-mist); background: var(--color-bone); }
.proof-inner {
  display: flex; flex-wrap: wrap; align-items: center; justify-content: center;
  gap: 0.75rem 1.25rem; padding-block: var(--space-6);
  font-family: var(--font-mono); font-size: 0.78rem; letter-spacing: 0.08em;
  text-transform: uppercase; color: var(--color-graphite); opacity: 0.75;
}
.proof i { color: var(--color-mist); font-style: normal; }

/* ===== Secciones ===== */
.section { padding-block: var(--section-pad); }
.section-alt { background: var(--color-fog); }
.section-head { max-width: 60ch; margin-bottom: var(--space-12); }
.section-head h2 { margin-bottom: 0; }
.section-note { margin-top: var(--space-6); color: var(--color-graphite); }

/* ===== Servicios (grid asimétrico 12 col) ===== */
.services-grid { display: grid; grid-template-columns: repeat(12, 1fr); gap: var(--space-6); }
.service {
  display: flex; flex-direction: column; gap: 0.75rem;
  background: var(--color-pure); border: 1px solid var(--color-mist);
  border-radius: var(--radius-lg); padding: var(--space-8);
  transition: border-color var(--dur-base) var(--ease-out), box-shadow var(--dur-base) var(--ease-out);
}
.service:hover { border-color: rgba(90, 90, 96, 0.3); box-shadow: var(--shadow-sm); }
.service:nth-child(1) { grid-column: span 7; }
.service:nth-child(2) { grid-column: span 5; }
.service:nth-child(3) { grid-column: span 5; }
.service:nth-child(4) { grid-column: span 7; }
.service p { color: var(--color-graphite); }
.service .link-arrow { margin-top: 0.5rem; }

/* ===== Proceso ===== */
.steps {
  list-style: none; margin: 0; padding: 0;
  display: grid; grid-template-columns: repeat(4, 1fr); gap: var(--space-6);
}
.step { display: flex; flex-direction: column; gap: 0.6rem; padding-top: var(--space-6); border-top: 1px solid var(--color-mist); }
.step-num { font-family: var(--font-mono); font-size: 0.85rem; color: var(--color-signal); letter-spacing: 0.1em; }
.step p { color: var(--color-graphite); font-size: 0.95rem; }

/* ===== Casos ===== */
.cases { display: grid; grid-template-columns: repeat(3, 1fr); gap: var(--space-12); }
.case { display: flex; flex-direction: column; gap: 0.6rem; }
.metric {
  font-family: var(--font-mono); font-weight: 500;
  font-size: clamp(2.4rem, 4.5vw, 3.4rem); line-height: 1; letter-spacing: -0.03em;
  color: var(--color-ink);
}
.metric span { font-size: 0.45em; color: var(--color-graphite); }
.case p:last-child { color: var(--color-graphite); }

/* ===== Nosotros ===== */
.about { max-width: 62ch; }
.about-lead { font-family: var(--font-display); font-weight: 300; font-size: var(--text-lead); line-height: 1.5; color: var(--color-ink); }
.about .btn { margin-top: var(--space-12); }

/* ===== CTA + formulario ===== */
.cta { background: var(--color-ink); color: var(--color-bone); position: relative; overflow: hidden; }
.cta-inner { max-width: 56ch; margin-inline: auto; text-align: center; }
.cta h2 { color: var(--color-bone); }
.cta-sub { margin-top: var(--space-6); color: rgba(242, 242, 238, 0.7); }

.cta-logo { display: flex; justify-content: center; margin-bottom: var(--space-8); }
.cta-logo img {
  width: 120px;
  filter: drop-shadow(0 0 0 transparent);
  transition: filter 800ms var(--ease-out);
}
.cta-logo.in-view img { filter: drop-shadow(0 0 24px rgba(0, 68, 255, 0.25)); }

.contact-form {
  display: grid; grid-template-columns: 1fr 1fr; gap: var(--space-8) var(--space-6);
  text-align: left; margin-top: var(--space-16);
}
.field { display: flex; flex-direction: column; gap: 0.5rem; }
.field-full { grid-column: 1 / -1; }
.contact-form label {
  font-family: var(--font-mono); font-size: var(--text-kicker);
  text-transform: uppercase; letter-spacing: 0.2em; color: rgba(242, 242, 238, 0.6);
}
.contact-form input, .contact-form textarea {
  font: inherit; color: var(--color-bone); background: transparent;
  border: 0; border-bottom: 1px solid rgba(214, 214, 209, 0.3);
  border-radius: 0; padding: 0.6rem 0; resize: vertical;
  transition: border-color var(--dur-base) var(--ease-out);
}
.contact-form input:focus, .contact-form textarea:focus {
  outline: none; border-bottom: 2px solid var(--color-bone); padding-bottom: calc(0.6rem - 1px);
}
.form-status { margin-top: var(--space-6); font-size: 0.95rem; min-height: 1.3em; }
.form-status.ok { color: var(--color-plasma); }
.form-status.err { color: #ff9a9a; }

/* ===== Footer ===== */
.site-footer { border-top: 1px solid var(--color-mist); padding-block: var(--space-16); }
.footer-inner { display: flex; flex-direction: column; align-items: center; gap: var(--space-6); text-align: center; }
.footer-brand { display: flex; align-items: center; gap: 0.8rem; }
.footer-logo { width: 96px; opacity: 0.85; }
.live {
  display: inline-flex; align-items: center; gap: 0.4rem;
  font-family: var(--font-mono); font-size: 0.7rem; text-transform: uppercase;
  letter-spacing: 0.14em; color: var(--color-graphite);
}
.live-dot {
  width: 6px; height: 6px; border-radius: 50%; background: var(--color-plasma);
  animation: pulse 2s var(--ease-inout) infinite;
}
@keyframes pulse {
  0% { box-shadow: 0 0 0 0 rgba(200, 255, 61, 0.7); }
  70% { box-shadow: 0 0 0 8px rgba(200, 255, 61, 0); }
  100% { box-shadow: 0 0 0 0 rgba(200, 255, 61, 0); }
}
.footer-nav { display: flex; gap: var(--space-8); }
.footer-nav a {
  font-family: var(--font-mono); font-size: 0.72rem; text-transform: uppercase;
  letter-spacing: 0.14em; color: var(--color-graphite);
}
.footer-nav a:hover { color: var(--color-ink); }
.footer-copy { font-size: 0.85rem; color: var(--color-graphite); }

/* ===== Scroll reveal ===== */
.reveal { opacity: 0; transform: translateY(14px); transition: opacity var(--dur-slow) var(--ease-out), transform var(--dur-slow) var(--ease-out); }
.reveal.in-view { opacity: 1; transform: none; }

/* ===== Responsive ===== */

/* Tablet y menor: hero tipográfico.
   Ocultamos el logo grande del hero para no repetir el del header (la marca
   ya aparece arriba en el header y abajo en el footer). */
@media (max-width: 900px) {
  .hero { padding-top: clamp(2rem, 6vw, 3rem); }
  .hero-inner { grid-template-columns: 1fr; }
  .hero-visual { display: none; }
  .hero-text { max-width: 46ch; }
  .hero .lead { max-width: 100%; }

  .service:nth-child(n) { grid-column: span 6; }
  .steps { grid-template-columns: repeat(2, 1fr); }
  .cases { grid-template-columns: 1fr; gap: var(--space-16); }
}

/* Teléfono */
@media (max-width: 600px) {
  .nav-toggle { display: flex; }
  .nav-menu {
    position: absolute; top: 60px; left: 0; right: 0; display: none;
    flex-direction: column; align-items: stretch; gap: 0;
    background: var(--color-bone); border-bottom: 1px solid var(--color-mist);
    padding: 0.5rem var(--container-pad) 1.25rem; box-shadow: var(--shadow-md);
  }
  .nav-menu.open { display: flex; }
  .nav-menu a { display: block; padding: 0.9rem 0; font-size: 0.8rem; }
  .nav-cta { border-bottom: 0 !important; }

  .header-inner { height: 60px; }
  .brand-logo { width: 50px; height: 38px; }

  h1 { font-size: clamp(2.05rem, 9.5vw, 2.5rem); }
  .lead { font-size: 1.02rem; }
  .hero-actions { margin-top: var(--space-6); }

  .service:nth-child(n) { grid-column: 1 / -1; }
  .steps { grid-template-columns: 1fr; }
  .contact-form { grid-template-columns: 1fr; }

  .footer-inner { gap: var(--space-8); }
}

/* Teléfono chico: CTAs del hero a ancho completo (mejor target táctil) */
@media (max-width: 460px) {
  .hero-actions { flex-direction: column; align-items: stretch; }
  .hero-actions .btn { width: 100%; }
}

/* ===== Reduced motion ===== */
@media (prefers-reduced-motion: reduce) {
  html { scroll-behavior: auto; }
  *, *::before, *::after { animation-duration: 0.01ms !important; animation-iteration-count: 1 !important; transition-duration: 0.01ms !important; }
  .reveal { opacity: 1; transform: none; }
  .hero-logo { transform: none !important; }
}