/* ==========================================================================
   LEREN CLOUD — Sistema de diseño
   Constelación educativa: tinta nocturna, papel de niebla, latón académico.
   ========================================================================== */

@import url('https://fonts.googleapis.com/css2?family=Fraunces:ital,opsz,wght@0,9..144,300;0,9..144,400;0,9..144,500;0,9..144,600;0,9..144,700;1,9..144,400;1,9..144,500&family=Sora:wght@300;400;500;600;700;800&family=IBM+Plex+Mono:wght@400;500;600&display=swap');

:root {
  /* --- Paleta de Color: Azul Educativo Institucional (Inspirada en Colplex) --- */
  --ink: #0A2540;
  /* Azul océano profundo corporativo */
  --ink-2: #0F3460;
  /* Azul marino de contraste */
  --ink-3: #1E40AF;
  /* Bordes y destacados en marino */
  --paper: #FFFFFF;
  /* Fondo primario blanco puro */
  --paper-2: #F0F6FF;
  /* Fondo secundario azul hielo ultra limpio */
  --paper-3: #DBEAFE;
  /* Bordes sutiles azul cielo claro */
  --paper-4: #EBF3FE;
  /* Tarjetas e inputs azul hielo */
  --gold: #2563EB;
  /* Azul cobalto institucional vibrante */
  --gold-soft: #3B82F6;
  /* Azul brillante interactivo */
  --pine: #0EA5E9;
  /* Azul cian / turquesa educativo */
  --pine-soft: #38BDF8;
  --sky-blue: #0284C7;
  /* Azul cielo profesional */
  --sky-blue-soft: #60A5FA;
  --text-dark: #0A2540;
  /* Texto principal azul noche oscuro de alta legibilidad */
  --text-muted: #475569;
  /* Texto secundario slate */
  --text-light: #FFFFFF;
  /* Texto claro sobre bloques oscuros */
  --text-light-muted: #93C5FD;

  --radius-s: 10px;
  --radius-m: 18px;
  --radius-l: 32px;

  --ease: cubic-bezier(.16, .84, .24, 1);
  --ease-soft: cubic-bezier(.4, 0, .2, 1);

  --font-display: 'Fraunces', 'Iowan Old Style', 'Georgia', serif;
  --font-body: 'Sora', 'Segoe UI', system-ui, sans-serif;
  --font-mono: 'IBM Plex Mono', 'SFMono-Regular', Menlo, monospace;

  --container: min(1180px, 92vw);
}

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

html {
  scroll-behavior: smooth;
}

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

  *,
  *::before,
  *::after {
    animation-duration: .01ms !important;
    animation-iteration-count: 1 !important;
    transition-duration: .01ms !important;
    scroll-behavior: auto !important;
  }
}

body {
  margin: 0;
  background: var(--paper);
  color: var(--text-dark);
  font-family: var(--font-body);
  font-size: 16.5px;
  line-height: 1.6;
  -webkit-font-smoothing: antialiased;
  overflow-x: hidden;
}

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

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

button {
  font-family: inherit;
  cursor: pointer;
}

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

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

::selection {
  background: var(--gold);
  color: var(--ink);
}

.container {
  width: var(--container);
  margin-inline: auto;
}

.eyebrow {
  font-family: var(--font-mono);
  font-size: 12.5px;
  letter-spacing: .14em;
  text-transform: uppercase;
  color: var(--gold);
  display: inline-flex;
  align-items: center;
  gap: .6em;
}

.eyebrow::before {
  content: '';
  width: 22px;
  height: 1px;
  background: var(--gold);
  display: inline-block;
}

h1,
h2,
h3 {
  font-family: var(--font-display);
  font-weight: 500;
  letter-spacing: -.01em;
}

.section {
  padding: min(11vw, 120px) 0;
  position: relative;
}

.section--ink {
  background: var(--ink);
  color: var(--text-light);
}

.section--paper {
  background: var(--paper);
}

.section--paper-2 {
  background: var(--paper-2);
}

.section-head {
  max-width: 640px;
  margin-bottom: 56px;
}

.section-head h2 {
  font-size: clamp(2rem, 4.2vw, 2.9rem);
  margin-top: 14px;
  line-height: 1.12;
}

.section-head p {
  margin-top: 18px;
  font-size: 1.05rem;
  color: var(--text-muted);
}

.section--ink .section-head p {
  color: var(--text-light-muted);
}

/* --- focus visibility --- */
a:focus-visible,
button:focus-visible,
input:focus-visible,
textarea:focus-visible,
select:focus-visible {
  outline: 2px solid var(--gold);
  outline-offset: 3px;
  border-radius: 4px;
}

/* ==========================================================================
   Cursor personalizado
   ========================================================================== */
.cursor-dot,
.cursor-ring {
  position: fixed;
  top: 0;
  left: 0;
  pointer-events: none;
  z-index: 9999;
  border-radius: 50%;
  transform: translate(-50%, -50%);
  will-change: transform;
}

.cursor-dot {
  width: 6px;
  height: 6px;
  background: var(--gold);
  transition: transform .12s var(--ease-soft), opacity .2s;
}

.cursor-ring {
  width: 38px;
  height: 38px;
  border: 1px solid rgba(199, 154, 60, .55);
  transition: width .35s var(--ease), height .35s var(--ease), border-color .35s, background .35s, transform .12s var(--ease-soft);
}

.cursor-ring.is-hover {
  width: 76px;
  height: 76px;
  background: rgba(199, 154, 60, .08);
  border-color: var(--gold);
}

.cursor-ring.is-node {
  width: 120px;
  height: 120px;
  background: rgba(199, 154, 60, .06);
  border-color: var(--pine-soft);
  border-style: dashed;
}

.cursor-ring.is-text {
  width: 4px;
  height: 34px;
  border-radius: 2px;
  background: var(--gold);
  border: none;
}

@media (hover:none),
(pointer:coarse) {

  .cursor-dot,
  .cursor-ring {
    display: none;
  }
}

/* ==========================================================================
   Navegación
   ========================================================================== */
.nav {
  position: fixed;
  top: 0;
  left: 0;
  right: 0;
  z-index: 500;
  padding: 16px 0;
  background: rgba(255, 255, 255, .88);
  backdrop-filter: blur(16px) saturate(160%);
  border-bottom: 1px solid rgba(226, 232, 240, .8);
  transition: padding .4s var(--ease), background .4s var(--ease), box-shadow .4s var(--ease), border-color .4s var(--ease);
}

.nav.is-scrolled {
  padding: 12px 0;
  background: rgba(255, 255, 255, .96);
  box-shadow: 0 10px 25px -5px rgba(15, 23, 42, .06);
  border-color: var(--paper-3);
}

.nav .container {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 24px;
}

.nav-brand {
  display: flex;
  align-items: center;
  gap: 12px;
}

.nav-brand img {
  width: 44px;
  height: auto;
  object-fit: contain;
}

.nav-brand-text {
  font-family: var(--font-display);
  font-size: 1.2rem;
  color: var(--text-dark);
  letter-spacing: .01em;
}

.nav-brand-text b {
  font-weight: 700;
  color: var(--sky-blue);
}

.nav-links {
  display: flex;
  align-items: center;
  gap: 2px;
}

.nav-links a {
  position: relative;
  font-size: .88rem;
  font-weight: 500;
  color: var(--text-muted);
  padding: 9px 16px;
  border-radius: 100px;
  transition: color .3s, background .3s;
}

.nav-links a:hover {
  color: var(--text-dark);
  background: rgba(241, 245, 249, .8);
}

.nav-links a::after {
  content: '';
  position: absolute;
  left: 16px;
  right: 16px;
  bottom: 5px;
  height: 2px;
  background: var(--gold);
  border-radius: 2px;
  transform: scaleX(0);
  transform-origin: left;
  transition: transform .35s var(--ease);
}

.nav-links a:hover::after {
  transform: scaleX(1);
}

.nav-links a.is-current {
  color: var(--text-dark);
  font-weight: 600;
}

.nav-links a.is-current::after {
  transform: scaleX(1);
}

.nav-cta {
  font-family: var(--font-mono);
  font-size: .78rem;
  letter-spacing: .04em;
  color: #FFFFFF !important;
  background: var(--text-dark);
  padding: 10px 22px !important;
  border-radius: 100px;
  white-space: nowrap;
  box-shadow: 0 4px 14px rgba(15, 23, 42, .15);
  transition: transform .3s var(--ease), background .3s, box-shadow .3s !important;
}

.nav-cta::after {
  display: none;
}

.nav-cta:hover {
  background: var(--gold) !important;
  color: #FFFFFF !important;
  transform: translateY(-2px);
  box-shadow: 0 6px 20px rgba(217, 119, 6, .3);
}

.nav-toggle {
  display: none;
  background: var(--paper-2);
  border: 1px solid var(--paper-3);
  border-radius: 10px;
  width: 42px;
  height: 42px;
  align-items: center;
  justify-content: center;
  color: var(--text-dark);
}

@media (max-width:900px) {
  .nav-links {
    position: fixed;
    inset: 0 0 0 auto;
    width: min(320px, 84vw);
    height: 100vh;
    background: #FFFFFF;
    flex-direction: column;
    align-items: stretch;
    padding: 100px 28px 40px;
    gap: 6px;
    transform: translateX(100%);
    transition: transform .5s var(--ease);
    box-shadow: -20px 0 50px rgba(15, 23, 42, .12);
    border-left: 1px solid var(--paper-3);
  }

  .nav-links.is-open {
    transform: translateX(0);
  }

  .nav-links a {
    font-size: 1rem;
    padding: 14px 16px;
    color: var(--text-dark);
  }

  .nav-toggle {
    display: flex;
  }

  .nav-cta {
    align-self: flex-start;
    margin-top: 14px;
  }
}

/* ==========================================================================
   Botones
   ========================================================================== */
.btn {
  display: inline-flex;
  align-items: center;
  gap: 10px;
  font-family: var(--font-mono);
  font-size: .82rem;
  letter-spacing: .03em;
  padding: 15px 26px;
  border-radius: 100px;
  border: 1px solid transparent;
  transition: transform .35s var(--ease), background .3s, border-color .3s, color .3s;
}

.btn svg {
  width: 15px;
  height: 15px;
  transition: transform .35s var(--ease);
}

.btn:hover svg {
  transform: translateX(4px);
}

.btn:hover {
  transform: translateY(-2px);
}

.btn-gold {
  background: var(--gold);
  color: #FFFFFF;
  font-weight: 600;
  box-shadow: 0 4px 18px rgba(37, 99, 235, .25);
}

.btn-gold:hover {
  background: var(--gold-soft);
  color: #FFFFFF;
  box-shadow: 0 8px 24px rgba(37, 99, 235, .35);
}

.btn-outline-ink {
  border-color: rgba(255, 255, 255, .35);
  color: var(--text-light);
}

.btn-outline-ink:hover {
  border-color: #FFFFFF;
  color: #FFFFFF;
  background: rgba(255, 255, 255, .1);
}

.btn-outline-dark {
  border-color: var(--gold);
  color: var(--gold);
  background: rgba(37, 99, 235, .04);
}

.btn-outline-dark:hover {
  border-color: var(--gold);
  color: #FFFFFF;
  background: var(--gold);
}
  color: var(--sky-blue);
}

.btn-ghost {
  color: var(--text-dark);
  padding-left: 0;
  padding-right: 0;
}

.btn-ghost svg {
  width: 13px;
  height: 13px;
}

/* ==========================================================================
   Tarjetas genéricas
   ========================================================================== */
.card {
  background: var(--paper);
  border: 1px solid var(--paper-3);
  border-radius: var(--radius-m);
  padding: 34px;
  transition: transform .5s var(--ease), box-shadow .5s var(--ease), border-color .4s;
}

.card:hover {
  transform: translateY(-6px);
  box-shadow: 0 30px 60px -30px rgba(15, 27, 45, .25);
  border-color: var(--gold);
}

.section--ink .card {
  background: var(--ink-2);
  border-color: var(--ink-3);
}

.section--ink .card:hover {
  box-shadow: 0 30px 60px -30px rgba(0, 0, 0, .6);
}

/* ==========================================================================
   Reveal on scroll
   ========================================================================== */
[data-reveal] {
  opacity: 0;
  transform: translateY(28px);
  transition: opacity .9s var(--ease), transform .9s var(--ease);
}

[data-reveal].is-visible {
  opacity: 1;
  transform: translateY(0);
}

[data-reveal="scale"] {
  transform: translateY(0) scale(.94);
}

[data-reveal="scale"].is-visible {
  transform: scale(1);
}

[data-reveal-group] [data-reveal]:nth-child(1) {
  transition-delay: .03s;
}

[data-reveal-group] [data-reveal]:nth-child(2) {
  transition-delay: .11s;
}

[data-reveal-group] [data-reveal]:nth-child(3) {
  transition-delay: .19s;
}

[data-reveal-group] [data-reveal]:nth-child(4) {
  transition-delay: .27s;
}

[data-reveal-group] [data-reveal]:nth-child(5) {
  transition-delay: .35s;
}

[data-reveal-group] [data-reveal]:nth-child(6) {
  transition-delay: .43s;
}

/* ==========================================================================
   Progreso de scroll de página
   ========================================================================== */
.scroll-progress {
  position: fixed;
  top: 0;
  left: 0;
  height: 3px;
  width: 0%;
  background: linear-gradient(90deg, var(--pine), var(--gold));
  z-index: 600;
  transition: width .1s linear;
}

/* ==========================================================================
   Grano de textura ambiental (papel/tinta)
   ========================================================================== */
.grain {
  position: fixed;
  inset: 0;
  z-index: 2;
  pointer-events: none;
  opacity: .035;
  mix-blend-mode: multiply;
  background-image: url("data:image/svg+xml,%3Csvg xmlns='http://www.w3.org/2000/svg' width='120' height='120'%3E%3Cfilter id='n'%3E%3CfeTurbulence type='fractalNoise' baseFrequency='0.9' numOctaves='2' stitchTiles='stitch'/%3E%3C/filter%3E%3Crect width='100%25' height='100%25' filter='url(%23n)'/%3E%3C/svg%3E");
}

/* ==========================================================================
   Footer
   ========================================================================== */
.footer {
  background: var(--ink);
  color: var(--text-light-muted);
  padding: 80px 0 30px;
}

.footer-top {
  display: grid;
  grid-template-columns: 1.4fr 1fr 1fr 1.1fr;
  gap: 48px;
  padding-bottom: 56px;
  border-bottom: 1px solid var(--ink-3);
}

.footer-brand {
  display: flex;
  align-items: center;
  gap: 12px;
  margin-bottom: 18px;
}

.footer-brand img {
  width: 40px;
}

.footer-brand span {
  font-family: var(--font-display);
  color: var(--text-light);
  font-size: 1.08rem;
}

.footer p {
  font-size: .92rem;
  line-height: 1.7;
  max-width: 34ch;
}

.footer h4 {
  font-family: var(--font-mono);
  font-size: .74rem;
  letter-spacing: .1em;
  text-transform: uppercase;
  color: var(--text-light);
  margin-bottom: 18px;
}

.footer-links li {
  margin-bottom: 11px;
}

.footer-links a {
  font-size: .92rem;
  transition: color .3s, padding-left .3s;
}

.footer-links a:hover {
  color: var(--gold);
  padding-left: 4px;
}

.footer-bottom {
  display: flex;
  justify-content: space-between;
  align-items: center;
  padding-top: 26px;
  font-size: .8rem;
  flex-wrap: wrap;
  gap: 14px;
}

.footer-bottom a {
  margin-left: 22px;
}

.footer-bottom a:hover {
  color: var(--gold);
}

@media (max-width:860px) {
  .footer-top {
    grid-template-columns: 1fr 1fr;
    row-gap: 36px;
  }
}

@media (max-width:560px) {
  .footer-top {
    grid-template-columns: 1fr;
  }
}

/* ==========================================================================
   Utilidades
   ========================================================================== */
.tag {
  font-family: var(--font-mono);
  font-size: .72rem;
  letter-spacing: .06em;
  text-transform: uppercase;
  padding: 5px 11px;
  border-radius: 100px;
  border: 1px solid var(--paper-3);
  color: var(--text-muted);
}

.section--ink .tag {
  border-color: var(--ink-3);
  color: var(--text-light-muted);
}

.tag--gold {
  border-color: var(--gold);
  color: var(--gold);
}

.tag--pine {
  border-color: var(--pine);
  color: var(--pine);
}

.mono-num {
  font-family: var(--font-mono);
}

.page-transition {
  position: fixed;
  inset: 0;
  z-index: 9998;
  background: var(--ink);
  transform: translateY(101%);
  display: flex;
  align-items: center;
  justify-content: center;
}

.page-transition img {
  width: 56px;
  opacity: 0;
}

@media (max-width:640px) {
  .section {
    padding: 78px 0;
  }

  .section-head {
    margin-bottom: 38px;
  }
}