/* Cortex · landing. Sin dependencias: tokens en :root, secciones de arriba abajo. */

:root {
  --bg: #060a1c;
  --bg-alt: #0a1029;
  --surface: #0e1533;
  --surface-2: #131c42;
  --border: rgba(150, 170, 255, 0.12);
  --border-strong: rgba(150, 170, 255, 0.24);
  --text: #e8ecfa;
  --muted: #a1a9c9;
  --faint: #6f789c;
  --cyan: #22d3ee;
  --violet: #8b5cf6;
  --grad: linear-gradient(100deg, var(--cyan), var(--violet));
  --ok: #34d399;
  --review: #fbbf24;
  --deny: #f87171;

  --font: "Inter", system-ui, -apple-system, "Segoe UI", Roboto, sans-serif;
  --font-head: "Space Grotesk", var(--font);
  --font-mono: "JetBrains Mono", ui-monospace, "SF Mono", Menlo, monospace;

  --radius: 14px;
  --radius-sm: 8px;
  --gutter: 24px;
  --max: 1160px;
  --nav-h: 68px;

  color-scheme: dark;
}

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

html { scroll-behavior: smooth; scroll-padding-top: calc(var(--nav-h) + 12px); }

body {
  margin: 0;
  background: var(--bg);
  color: var(--text);
  font: 400 16px/1.6 var(--font);
  -webkit-font-smoothing: antialiased;
  text-rendering: optimizeLegibility;
  overflow-x: hidden;
}

img, svg { display: block; max-width: 100%; }
a { color: inherit; }
h1, h2, h3, h4 { font-family: var(--font-head); line-height: 1.15; margin: 0; letter-spacing: -0.01em; }
p { margin: 0; }
strong { color: var(--text); font-weight: 600; }
.mono { font-family: var(--font-mono); }

.sr {
  position: absolute; width: 1px; height: 1px; padding: 0; margin: -1px;
  overflow: hidden; clip: rect(0 0 0 0); white-space: nowrap; border: 0;
}

.skip {
  position: absolute; left: 12px; top: -48px; z-index: 100;
  background: var(--cyan); color: var(--bg); padding: 8px 14px; border-radius: var(--radius-sm);
  font-weight: 600; text-decoration: none;
}
.skip:focus { top: 12px; }

:focus-visible { outline: 2px solid var(--cyan); outline-offset: 3px; border-radius: 4px; }

.wrap { width: 100%; max-width: var(--max); margin: 0 auto; padding: 0 var(--gutter); }
.wrap--narrow { max-width: 820px; }

/* Botones y piezas comunes */

.btn {
  display: inline-flex; align-items: center; justify-content: center; gap: 8px;
  padding: 13px 22px; border-radius: 999px; border: 0;
  background: var(--grad); color: #050817;
  font: 600 15px/1 var(--font); text-decoration: none; cursor: pointer;
  box-shadow: 0 8px 30px -10px rgba(34, 211, 238, 0.55);
  transition: transform .15s ease, box-shadow .15s ease;
}
.btn:hover { transform: translateY(-1px); box-shadow: 0 12px 34px -10px rgba(139, 92, 246, 0.65); }
.btn--ghost {
  background: transparent; color: var(--text);
  border: 1px solid var(--border-strong); box-shadow: none;
}
.btn--ghost:hover { border-color: var(--cyan); box-shadow: none; }
.btn--sm { padding: 10px 16px; font-size: 14px; }
.btn--block { width: 100%; }

.eyebrow {
  font: 600 13px/1.2 var(--font); letter-spacing: 0.08em; text-transform: uppercase;
  background: var(--grad); -webkit-background-clip: text; background-clip: text; color: transparent;
  margin-bottom: 14px;
}
.lead { font-size: 18px; color: var(--muted); }
.link { color: var(--cyan); font-weight: 600; text-decoration: none; }
.link:hover { text-decoration: underline; }

.tag {
  display: inline-block; padding: 2px 10px; margin: 0 2px 4px 0; border-radius: 999px;
  font: 600 12px/1.6 var(--font); border: 1px solid currentColor;
}
.tag--ok { color: var(--ok); }
.tag--review { color: var(--review); }
.tag--deny { color: var(--deny); }

/* Navegación */

.nav {
  position: sticky; top: 0; z-index: 50; height: var(--nav-h);
  background: rgba(6, 10, 28, 0.72);
  backdrop-filter: saturate(160%) blur(14px); -webkit-backdrop-filter: saturate(160%) blur(14px);
  border-bottom: 1px solid transparent; transition: border-color .2s ease;
}
.nav.is-scrolled { border-bottom-color: var(--border); }
.nav__inner { height: 100%; display: flex; align-items: center; justify-content: space-between; gap: 16px; }

.brand { display: inline-flex; align-items: center; gap: 10px; text-decoration: none; font: 700 20px/1 var(--font-head); }
.brand img { border-radius: 9px; }

.nav__menu { display: flex; align-items: center; gap: 26px; }
.nav__menu a:not(.btn) { color: var(--muted); text-decoration: none; font-size: 15px; font-weight: 500; }
.nav__menu a:not(.btn):hover { color: var(--text); }

.nav__toggle { display: none; background: none; border: 0; padding: 10px; margin-right: -10px; cursor: pointer; color: var(--text); }
.nav__bars, .nav__bars::before, .nav__bars::after {
  display: block; width: 22px; height: 2px; background: currentColor; border-radius: 2px;
  transition: transform .2s ease, opacity .2s ease;
}
.nav__bars { position: relative; }
.nav__bars::before, .nav__bars::after { content: ""; position: absolute; left: 0; }
.nav__bars::before { top: -7px; }
.nav__bars::after { top: 7px; }
.nav__toggle[aria-expanded="true"] .nav__bars { background: transparent; }
.nav__toggle[aria-expanded="true"] .nav__bars::before { transform: translateY(7px) rotate(45deg); }
.nav__toggle[aria-expanded="true"] .nav__bars::after { transform: translateY(-7px) rotate(-45deg); }

/* Portada */

.hero { position: relative; padding: 72px 0 88px; overflow: hidden; }
.hero__glow {
  position: absolute; inset: -20% -10% auto; height: 760px; pointer-events: none;
  background:
    radial-gradient(40% 50% at 78% 30%, rgba(139, 92, 246, 0.22), transparent 70%),
    radial-gradient(35% 45% at 20% 10%, rgba(34, 211, 238, 0.16), transparent 70%);
}
.hero__grid { position: relative; display: grid; grid-template-columns: 1.1fr 0.9fr; gap: 56px; align-items: center; }
.hero h1 { font-size: clamp(36px, 5.2vw, 60px); font-weight: 700; margin-bottom: 22px; }
.hero .lead { max-width: 580px; }
.hero__cta { display: flex; flex-wrap: wrap; gap: 12px; margin: 32px 0 28px; }

.chips { list-style: none; display: flex; flex-wrap: wrap; gap: 8px; margin: 0; padding: 0; }
.chips li {
  font-size: 13px; color: var(--muted); padding: 6px 12px;
  border: 1px solid var(--border); border-radius: 999px; background: rgba(14, 21, 51, 0.6);
}

/* Ejemplo de evaluación */

.demo {
  margin: 0; background: linear-gradient(180deg, var(--surface-2), var(--surface));
  border: 1px solid var(--border-strong); border-radius: 18px;
  box-shadow: 0 30px 80px -30px rgba(0, 0, 0, 0.8), 0 0 0 1px rgba(34, 211, 238, 0.05), 0 0 60px -20px rgba(139, 92, 246, 0.35);
  overflow: hidden;
}
.demo__bar { display: flex; align-items: center; gap: 6px; padding: 12px 16px; border-bottom: 1px solid var(--border); }
.demo__dot { width: 10px; height: 10px; border-radius: 50%; background: var(--surface-2); border: 1px solid var(--border-strong); }
.demo__title { margin-left: 8px; font: 500 12px/1 var(--font-mono); color: var(--faint); }
.demo__body { padding: 20px; transition: opacity .3s ease; }
.demo__body.is-swapping { opacity: 0; }
.demo__block { background: rgba(6, 10, 28, 0.55); border: 1px solid var(--border); border-radius: 12px; padding: 16px; }
.demo__label { font: 600 11px/1 var(--font); letter-spacing: .08em; text-transform: uppercase; color: var(--faint); margin-bottom: 12px; }
.demo__fields { display: grid; grid-template-columns: 1fr 1fr; gap: 12px 16px; margin: 0; }
.demo__fields dt { font-size: 12px; color: var(--faint); }
.demo__fields dd { margin: 2px 0 0; font-size: 14px; font-weight: 500; }
.demo__arrow { display: flex; justify-content: center; color: var(--cyan); padding: 10px 0; }
.decision {
  display: inline-flex; align-items: center; gap: 8px;
  font: 700 20px/1 var(--font-head); padding: 8px 14px; border-radius: 10px; margin-bottom: 12px;
}
.decision::before { content: ""; width: 9px; height: 9px; border-radius: 50%; background: currentColor; box-shadow: 0 0 12px currentColor; }
.decision--ok { color: var(--ok); background: rgba(52, 211, 153, 0.1); }
.decision--review { color: var(--review); background: rgba(251, 191, 36, 0.1); }
.decision--deny { color: var(--deny); background: rgba(248, 113, 113, 0.1); }
.demo__reasons { margin: 0; padding-left: 18px; color: var(--muted); font-size: 14px; }
.demo__reasons li + li { margin-top: 4px; }
.demo figcaption { padding: 0 20px 16px; font-size: 12px; color: var(--faint); }

/* Secciones */

.section { padding: 104px 0; }
.section--tight { padding: 0 0 24px; }
.section--alt { background: var(--bg-alt); border-top: 1px solid var(--border); border-bottom: 1px solid var(--border); }
.section__head { max-width: 760px; margin-bottom: 48px; }
.section__head h2 { font-size: clamp(28px, 3.6vw, 42px); margin-bottom: 18px; }
.section__head p + p { margin-top: 14px; color: var(--muted); }
.subhead { font-size: 22px; margin: 64px 0 24px; }

/* Dos bloques */

.duo { display: grid; grid-template-columns: 1fr 1fr; gap: 20px; }
.duo__card {
  position: relative; display: block; padding: 32px; text-decoration: none;
  background: var(--surface); border: 1px solid var(--border); border-radius: var(--radius);
  transition: border-color .2s ease, transform .2s ease;
}
.duo__card::after {
  content: ""; position: absolute; inset: 0 0 auto; height: 2px; border-radius: var(--radius) var(--radius) 0 0;
  background: var(--grad); opacity: .7;
}
.duo__card:hover { border-color: var(--border-strong); transform: translateY(-2px); }
.duo__kicker { font-size: 13px; color: var(--faint); margin-bottom: 6px; }
.duo__card h3 { font-size: 26px; margin-bottom: 12px; }
.duo__card p { color: var(--muted); }
.duo__more { display: inline-block; margin-top: 18px; color: var(--cyan); font-weight: 600; font-size: 15px; }

/* Pasos de Shield */

.steps { list-style: none; margin: 0; padding: 0; display: grid; grid-template-columns: repeat(3, 1fr); gap: 20px; counter-reset: s; }
.step {
  position: relative; padding: 28px; border-radius: var(--radius);
  background: var(--surface); border: 1px solid var(--border);
}
.step__n {
  display: inline-grid; place-items: center; width: 34px; height: 34px; border-radius: 10px; margin-bottom: 18px;
  font: 700 16px/1 var(--font-head); color: var(--bg); background: var(--grad);
}
.step h3 { font-size: 20px; margin-bottom: 10px; }
.step p { color: var(--muted); font-size: 15px; }

/* Tarjetas */

.grid { display: grid; grid-template-columns: repeat(3, 1fr); gap: 16px; }
.grid--sec { grid-template-columns: repeat(4, 1fr); }
.grid--dep { grid-template-columns: repeat(4, 1fr); }
.card {
  padding: 24px; border-radius: var(--radius);
  background: var(--surface); border: 1px solid var(--border);
  transition: border-color .2s ease;
}
.card:hover { border-color: var(--border-strong); }
.card__icon {
  width: 36px; height: 36px; padding: 7px; margin-bottom: 16px; border-radius: 10px;
  fill: none; stroke: var(--cyan); stroke-width: 1.8; stroke-linecap: round; stroke-linejoin: round;
  background: rgba(34, 211, 238, 0.08); border: 1px solid rgba(34, 211, 238, 0.18);
}
.card h4 { font-size: 17px; margin-bottom: 8px; }
.card p { color: var(--muted); font-size: 15px; }
.section--alt .card { background: var(--surface); }

/* Anomalía y Tecnología: dos columnas */

.split { display: grid; grid-template-columns: 1fr 1fr; gap: 64px; align-items: start; }
.split .section__head { margin-bottom: 0; position: sticky; top: calc(var(--nav-h) + 32px); }
.split--rev { align-items: center; }
.split--rev .section__head { position: static; }

.logview {
  margin-top: 32px; padding: 16px 18px; border-radius: 12px;
  background: rgba(6, 10, 28, 0.7); border: 1px solid var(--border);
  font: 400 13px/1.9 var(--font-mono); color: var(--faint);
  overflow: hidden;
}
.logview p { white-space: pre; }
.lv-ok { color: var(--ok); }
.lv-bad { color: var(--review); }
.lv-hit { color: var(--text); background: rgba(251, 191, 36, 0.08); margin: 0 -18px; padding: 0 18px; border-left: 2px solid var(--review); }
.lv-hit em { font-style: normal; color: var(--review); margin-left: 10px; }

.feature-list { list-style: none; margin: 0; padding: 0; display: grid; gap: 14px; }
.feature-list li {
  padding: 22px 24px; border-radius: var(--radius);
  background: var(--surface); border: 1px solid var(--border);
}
.feature-list h3 { font-size: 18px; margin-bottom: 6px; }
.feature-list p { color: var(--muted); font-size: 15px; }

.bits { position: relative; justify-self: center; width: 100%; max-width: 440px; }
.bits__svg { width: 100%; height: auto; aspect-ratio: 1; }
.bits__svg rect { fill: var(--surface-2); }
.bits__svg rect.on { fill: url(#bitgrad); }
.bits__cap { text-align: center; margin-top: 14px; font-size: 13px; color: var(--faint); }

.checks { list-style: none; margin: 24px 0 0; padding: 0; display: grid; gap: 10px; }
.checks li { position: relative; padding-left: 30px; }
.checks li::before {
  content: ""; position: absolute; left: 0; top: 4px; width: 18px; height: 18px; border-radius: 50%;
  background: rgba(34, 211, 238, 0.12) url("data:image/svg+xml,%3Csvg xmlns='http://www.w3.org/2000/svg' viewBox='0 0 24 24'%3E%3Cpath d='M6 12l4 4 8-8' fill='none' stroke='%2322d3ee' stroke-width='3' stroke-linecap='round' stroke-linejoin='round'/%3E%3C/svg%3E") center/12px no-repeat;
}

/* Para quién */

.audience {
  margin-top: 56px; padding: 28px 32px; border-radius: var(--radius);
  border: 1px solid var(--border); background: linear-gradient(100deg, rgba(34, 211, 238, 0.06), rgba(139, 92, 246, 0.08));
  display: flex; flex-wrap: wrap; align-items: center; gap: 16px 40px;
}
.audience h3 { font-size: 20px; }
.audience ul { list-style: none; margin: 0; padding: 0; display: flex; flex-wrap: wrap; gap: 10px; }
.audience li { padding: 8px 14px; border-radius: 999px; background: rgba(6, 10, 28, 0.5); border: 1px solid var(--border); font-size: 14px; }

/* Preguntas */

.faq { display: grid; gap: 12px; }
.faq details { border-radius: 12px; background: var(--surface); border: 1px solid var(--border); }
.faq summary {
  list-style: none; cursor: pointer; padding: 18px 52px 18px 22px; position: relative;
  font: 600 17px/1.4 var(--font-head);
}
.faq summary::-webkit-details-marker { display: none; }
.faq summary::after {
  content: "+"; position: absolute; right: 22px; top: 50%; transform: translateY(-50%);
  font: 400 24px/1 var(--font); color: var(--cyan); transition: transform .2s ease;
}
.faq details[open] summary::after { transform: translateY(-50%) rotate(45deg); }
.faq details p { padding: 0 22px 20px; color: var(--muted); }

/* UMA */

.uma { display: grid; grid-template-columns: auto 1fr; gap: 48px; align-items: center; max-width: 980px; }
.uma__logo {
  width: 220px; height: 220px; object-fit: cover; border-radius: 50%;
  -webkit-mask-image: radial-gradient(circle, #000 55%, transparent 71%);
  mask-image: radial-gradient(circle, #000 55%, transparent 71%);
}
.uma h2 { font-size: clamp(26px, 3vw, 36px); margin-bottom: 16px; }
.uma p { color: var(--muted); margin-bottom: 18px; }

/* Contacto */

.section--contact { background: radial-gradient(60% 80% at 80% 100%, rgba(139, 92, 246, 0.14), transparent 70%), var(--bg-alt); border-top: 1px solid var(--border); }
.contact { display: grid; grid-template-columns: 1fr 1fr; gap: 64px; align-items: start; }
.contact h2 { font-size: clamp(28px, 3.6vw, 42px); margin-bottom: 16px; }
.contact__list { list-style: none; margin: 32px 0 0; padding: 0; display: grid; gap: 18px; }
.contact__list li { display: grid; gap: 2px; }
.contact__k { font-size: 12px; letter-spacing: .08em; text-transform: uppercase; color: var(--faint); }
.contact__list a { color: var(--text); text-decoration: none; font-size: 17px; font-weight: 500; }
.contact__list a:hover { color: var(--cyan); }

.form {
  position: relative; padding: 28px; border-radius: 18px; background: var(--surface); border: 1px solid var(--border-strong);
  display: grid; gap: 16px;
}
.form__row { display: grid; gap: 6px; margin: 0; padding: 0; border: 0; min-width: 0; }
.form label, .form legend { font-size: 14px; font-weight: 500; color: var(--muted); padding: 0; }
.opt { color: var(--faint); font-weight: 400; }
.form input[type="text"], .form input[type="email"], .form textarea {
  width: 100%; padding: 12px 14px; border-radius: 10px;
  background: var(--bg); color: var(--text); border: 1px solid var(--border-strong);
  font: 400 16px/1.4 var(--font); transition: border-color .15s ease;
}
.form textarea { resize: vertical; min-height: 100px; }
.form input:focus, .form textarea:focus { outline: none; border-color: var(--cyan); box-shadow: 0 0 0 3px rgba(34, 211, 238, 0.15); }
.form input[aria-invalid="true"] { border-color: var(--deny); }
.form__radios { display: flex; flex-wrap: wrap; gap: 8px 18px; }
.form__radios legend { width: 100%; margin-bottom: 6px; }
.form__radios label { display: inline-flex; align-items: center; gap: 8px; color: var(--text); cursor: pointer; }
.form__radios input { accent-color: var(--cyan); width: 16px; height: 16px; margin: 0; }
.form__note { font-size: 13px; color: var(--faint); }
.form__note.is-error { color: var(--deny); }
.form__note.is-ok { color: var(--ok); font-size: 15px; }
.form__note a { color: inherit; }
.form__hp { position: absolute; left: -10000px; width: 1px; height: 1px; overflow: hidden; }
.btn:disabled { opacity: .6; cursor: progress; transform: none; }

/* Pie */

.footer { padding: 36px 0; border-top: 1px solid var(--border); }
.footer__inner { display: flex; flex-wrap: wrap; align-items: center; justify-content: space-between; gap: 16px 32px; }
.footer p { font-size: 14px; color: var(--faint); }
.footer nav { display: flex; gap: 20px; }
.footer nav a { color: var(--muted); text-decoration: none; font-size: 14px; }
.footer nav a:hover { color: var(--text); }
.brand--foot { font-size: 17px; }
.brand--foot img { border-radius: 7px; }

/* Aparición al hacer scroll: solo con JS y sin preferencia de movimiento reducido */

.js .reveal { opacity: 0; transform: translateY(14px); transition: opacity .6s ease, transform .6s ease; }
.js .reveal.is-in { opacity: 1; transform: none; }

@media (prefers-reduced-motion: reduce) {
  html { scroll-behavior: auto; }
  .js .reveal { opacity: 1; transform: none; transition: none; }
  .demo__body, .btn, .duo__card { transition: none; }
}

/* Tabletas */

@media (max-width: 1040px) {
  .grid--sec, .grid--dep { grid-template-columns: repeat(2, 1fr); }
  .hero__grid { grid-template-columns: 1fr; gap: 48px; }
  .demo { max-width: 560px; }
  .split, .contact { grid-template-columns: 1fr; gap: 40px; }
  .split .section__head { position: static; }
  .split--rev .bits { order: 2; max-width: 320px; }
}

@media (max-width: 900px) {
  .nav__toggle { display: block; }
  .nav__menu {
    position: fixed; top: var(--nav-h); left: 0; right: 0;
    flex-direction: column; align-items: stretch; gap: 0;
    padding: 8px var(--gutter) 20px; background: rgba(6, 10, 28, 0.97);
    border-bottom: 1px solid var(--border);
    transform: translateY(-8px); opacity: 0; visibility: hidden;
    transition: opacity .2s ease, transform .2s ease, visibility .2s;
  }
  .nav__menu.is-open { transform: none; opacity: 1; visibility: visible; }
  .nav__menu a:not(.btn) { padding: 14px 0; border-bottom: 1px solid var(--border); font-size: 16px; }
  .nav__menu .btn { margin-top: 16px; }
  .steps, .grid { grid-template-columns: 1fr 1fr; }
}

/* Teléfonos */

@media (max-width: 640px) {
  :root { --gutter: 16px; }
  .hero { padding: 40px 0 48px; }
  .lead { font-size: 17px; }
  .section { padding: 72px 0; }
  .duo, .steps, .grid, .grid--sec, .grid--dep { grid-template-columns: 1fr; }
  .duo__card { padding: 24px; }
  .demo__body { padding: 14px; }
  .demo__fields { grid-template-columns: 1fr 1fr; }
  .subhead { margin-top: 48px; }
  .uma { grid-template-columns: 1fr; gap: 24px; text-align: left; }
  .uma__logo { width: 140px; height: 140px; }
  .audience { padding: 22px; }
  .form { padding: 20px; }
  .logview { font-size: 12px; }
  .footer__inner { flex-direction: column; align-items: flex-start; }
}