/* =====================================================
   Telecom STB — Sistema de diseño
   Paleta y tipografía según Manual de Identidad Corporativa
   ===================================================== */

:root {
  /* Paleta principal */
  --azul-corp: #0B3D91;      /* Azul Corporativo — liderazgo, confianza */
  --azul-electrico: #2F80FF; /* Azul Eléctrico — CTAs, acentos */
  --marino: #071A3D;         /* Azul Marino — fondos institucionales */
  --celeste: #7CC8FF;        /* Celeste Tecnológico — brillos, circuitos */
  --gris-claro: #E8EDF5;     /* Fondos de lectura */
  --gris-medio: #B6C2D2;     /* Divisores, iconografía secundaria */
  --gris-oscuro: #5E6D82;    /* Textos secundarios */
  --blanco: #FFFFFF;
  --negro: #101820;          /* Textos principales */

  /* Tipografía */
  --font-display: "Montserrat", system-ui, sans-serif;
  --font-body: "Inter", system-ui, sans-serif;

  /* Escala según manual: 48–60 / 32–40 / 24–28 / 16–18 / 14 */
  --fs-h1: clamp(2.5rem, 5.4vw, 3.75rem);
  --fs-h2: clamp(1.8rem, 3.4vw, 2.5rem);
  --fs-h3: clamp(1.15rem, 2vw, 1.35rem);
  --fs-body: 1.0625rem;
  --fs-small: 0.875rem;

  --radius: 14px;
  --radius-sm: 10px;
  --shadow: 0 10px 34px rgba(7, 26, 61, 0.10);
  --shadow-sm: 0 4px 14px rgba(7, 26, 61, 0.08);
  --container: 1220px;
  --header-h: 82px;
}

/* ---------- Reset ---------- */
*, *::before, *::after { box-sizing: border-box; margin: 0; padding: 0; }
html { scroll-behavior: smooth; scroll-padding-top: calc(var(--header-h) + 12px); }
body {
  font-family: var(--font-body);
  font-size: var(--fs-body);
  line-height: 1.65;
  color: var(--negro);
  background: var(--blanco);
  -webkit-font-smoothing: antialiased;
}
img, svg { max-width: 100%; display: block; }
a { color: var(--azul-corp); text-decoration: none; }
ul { list-style: none; }

h1, h2 { font-family: var(--font-display); font-weight: 800; line-height: 1.12; letter-spacing: -0.015em; }
h3 { font-family: var(--font-display); font-weight: 700; font-size: var(--fs-h3); line-height: 1.3; }

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

/* Accesibilidad */
.skip-link {
  position: absolute; left: -9999px; top: 0; z-index: 200;
  background: var(--azul-corp); color: var(--blanco);
  padding: 10px 18px; border-radius: 0 0 var(--radius-sm) 0;
}
.skip-link:focus { left: 0; }
:focus-visible { outline: 3px solid var(--azul-electrico); outline-offset: 3px; border-radius: 4px; }

/* ---------- Iconografía: lineal, bordes redondeados, espesor uniforme ---------- */
.icon {
  width: 26px; height: 26px; flex-shrink: 0;
  fill: none; stroke: var(--azul-electrico);
  stroke-width: 1.8; stroke-linecap: round; stroke-linejoin: round;
}
.icon-lg { width: 40px; height: 40px; }

/* ---------- Botones ---------- */
.btn {
  display: inline-flex; align-items: center; gap: 10px;
  font-family: var(--font-display); font-weight: 600; font-size: 1rem;
  padding: 14px 28px; border-radius: 999px; border: 2px solid transparent;
  white-space: nowrap;
  cursor: pointer; transition: transform .2s ease, box-shadow .2s ease, background .2s ease, border-color .2s ease;
}
.btn-sm { padding: 10px 20px; font-size: 0.9rem; }
.btn-block { width: 100%; justify-content: center; }
.btn-primary {
  background: linear-gradient(135deg, var(--azul-electrico), var(--azul-corp));
  color: var(--blanco);
  box-shadow: 0 6px 20px rgba(47, 128, 255, 0.35);
}
.btn-primary:hover { transform: translateY(-2px); box-shadow: 0 10px 28px rgba(47, 128, 255, 0.45); }
.btn-ghost { background: transparent; color: var(--blanco); border-color: rgba(124, 200, 255, 0.5); }
.btn-ghost:hover { border-color: var(--celeste); background: rgba(124, 200, 255, 0.08); }
.btn span { transition: transform .2s ease; }
.btn:hover span { transform: translateX(4px); }

/* ---------- Eyebrow con nodo de circuito ---------- */
.eyebrow {
  font-family: var(--font-display); font-weight: 600; font-size: 0.82rem;
  letter-spacing: 0.14em; text-transform: uppercase;
  color: var(--azul-corp);
  display: flex; align-items: center; gap: 12px; margin-bottom: 14px;
}
.eyebrow::before {
  content: ""; width: 34px; height: 2px; flex-shrink: 0;
  background: linear-gradient(90deg, var(--azul-electrico), transparent);
  border-radius: 2px;
  box-shadow: -1px 0 0 2px var(--azul-electrico);
}
.eyebrow-light { color: var(--celeste); }

/* ---------- Header ---------- */
.site-header {
  position: sticky; top: 0; z-index: 100;
  background: rgba(255, 255, 255, 0.92);
  backdrop-filter: blur(12px);
  border-bottom: 1px solid var(--gris-claro);
  height: var(--header-h);
  transition: box-shadow .25s ease;
}
.site-header.scrolled { box-shadow: var(--shadow-sm); }
.header-inner { display: flex; align-items: center; justify-content: space-between; height: 100%; gap: 20px; }
.brand { display: flex; align-items: center; gap: 14px; flex-shrink: 0; }
.brand-logo { height: 62px; width: auto; }
.brand-text { display: flex; flex-direction: column; line-height: 1.2; }
.brand-text strong { font-family: var(--font-display); font-weight: 800; font-size: 1.25rem; color: var(--azul-corp); letter-spacing: 0.02em; white-space: nowrap; }
.brand-text small { font-size: 0.6rem; letter-spacing: 0.07em; text-transform: uppercase; color: var(--gris-oscuro); white-space: nowrap; }

.nav-list { display: flex; align-items: center; gap: 2px; }
.nav-link {
  font-family: var(--font-display); font-weight: 600; font-size: 0.9rem;
  color: var(--negro); padding: 10px 12px; border-radius: 8px; position: relative;
  white-space: nowrap;
}
.nav-link::after {
  content: ""; position: absolute; left: 12px; right: 12px; bottom: 6px; height: 2px;
  background: var(--azul-electrico); border-radius: 2px;
  transform: scaleX(0); transform-origin: left; transition: transform .25s ease;
}
.nav-link:hover::after, .nav-link[aria-current="page"]::after { transform: scaleX(1); }
.nav-cta-item { margin-left: 12px; }
.nav-toggle { display: none; }

/* ---------- Hero ---------- */
.hero {
  position: relative; overflow: hidden;
  background:
    radial-gradient(1000px 500px at 80% -10%, rgba(47, 128, 255, 0.22), transparent 60%),
    radial-gradient(700px 400px at 10% 110%, rgba(11, 61, 145, 0.45), transparent 60%),
    var(--marino);
  color: var(--blanco);
  padding: clamp(90px, 12vw, 150px) 0 clamp(70px, 8vw, 110px);
}
#circuitCanvas { position: absolute; inset: 0; width: 100%; height: 100%; opacity: 0.55; }
.hero-glow {
  position: absolute; inset: 0; pointer-events: none;
  background: radial-gradient(600px 320px at 50% 42%, rgba(7, 26, 61, 0.55), transparent 70%);
}
.hero-inner { position: relative; z-index: 2; text-align: center; max-width: 900px; }
.hero-title { font-size: var(--fs-h1); margin-bottom: 22px; }
.grad-text {
  background: linear-gradient(90deg, var(--celeste), var(--azul-electrico));
  -webkit-background-clip: text; background-clip: text; color: transparent;
}
.hero-lead {
  font-size: clamp(1.05rem, 1.8vw, 1.25rem); font-weight: 300;
  color: var(--gris-medio); max-width: 640px; margin: 0 auto 34px;
}
.hero .eyebrow { justify-content: center; }
.hero .eyebrow::before { display: none; }
.hero-actions { display: flex; gap: 16px; justify-content: center; flex-wrap: wrap; margin-bottom: 60px; }

.hero-stats {
  display: grid; grid-template-columns: repeat(4, 1fr); gap: 18px;
  border-top: 1px solid rgba(124, 200, 255, 0.18); padding-top: 38px;
}
.stat dd {
  font-family: var(--font-display); font-weight: 800;
  font-size: clamp(1.7rem, 3vw, 2.4rem); color: var(--blanco); order: -1;
}
.stat dt { font-size: 0.85rem; color: var(--gris-medio); }
.stat { display: flex; flex-direction: column; gap: 2px; }

/* ---------- Secciones ---------- */
.section { padding: clamp(70px, 9vw, 110px) 0; }
.section-alt { background: linear-gradient(180deg, var(--gris-claro) 0%, #F4F7FC 100%); }
.section-title { font-size: var(--fs-h2); color: var(--negro); margin-bottom: 20px; max-width: 760px; }
.section-dark { background: var(--marino); color: var(--blanco); }
.section-dark .section-title { color: var(--blanco); }

.lead-text { font-size: 1.15rem; margin-bottom: 18px; }
.two-col { display: grid; grid-template-columns: 1fr 1fr; gap: clamp(36px, 5vw, 70px); align-items: center; }
#nosotros .two-col { align-items: start; margin-top: 26px; }
#nosotros p { margin-bottom: 16px; color: var(--gris-oscuro); }
#nosotros .lead-text { color: var(--negro); }
.purpose-line {
  border-left: 3px solid var(--azul-electrico);
  padding: 14px 20px; background: var(--gris-claro); border-radius: 0 var(--radius-sm) var(--radius-sm) 0;
  color: var(--azul-corp) !important;
}

.principles { display: flex; flex-direction: column; gap: 22px; }
.principles li { display: flex; gap: 16px; align-items: flex-start; }
.principles .icon { margin-top: 4px; }
.principles h3 { font-size: 1.05rem; margin-bottom: 3px; color: var(--azul-corp); }
.principles p { font-size: 0.95rem; color: var(--gris-oscuro); margin: 0 !important; }

/* ---------- Cards servicios ---------- */
.cards-grid {
  display: grid; grid-template-columns: repeat(3, 1fr); gap: 24px; margin-top: 40px;
}
.card {
  background: var(--blanco); border: 1px solid var(--gris-claro);
  border-radius: var(--radius); padding: 34px 28px;
  box-shadow: var(--shadow-sm);
  transition: transform .25s ease, box-shadow .25s ease, border-color .25s ease;
  position: relative; overflow: hidden;
}
.card::before {
  content: ""; position: absolute; top: 0; left: 0; right: 0; height: 3px;
  background: linear-gradient(90deg, var(--azul-electrico), var(--celeste));
  transform: scaleX(0); transform-origin: left; transition: transform .35s ease;
}
.card:hover { transform: translateY(-6px); box-shadow: var(--shadow); border-color: rgba(47, 128, 255, 0.3); }
.card:hover::before { transform: scaleX(1); }
.card .icon-lg { margin-bottom: 18px; }
.card h3 { color: var(--azul-corp); margin-bottom: 10px; }
.card p { color: var(--gris-oscuro); font-size: 0.97rem; }

/* ---------- Sectores ---------- */
.sectors-grid {
  display: grid; grid-template-columns: repeat(4, 1fr); gap: 20px; margin-top: 40px;
}
.sector {
  text-align: center; padding: 30px 20px;
  border: 1px solid var(--gris-claro); border-radius: var(--radius);
  transition: transform .25s ease, box-shadow .25s ease, border-color .25s ease;
}
.sector:hover { transform: translateY(-4px); box-shadow: var(--shadow-sm); border-color: rgba(47, 128, 255, 0.3); }
.sector .icon { width: 34px; height: 34px; margin: 0 auto 14px; }
.sector h3 { font-size: 1.02rem; color: var(--negro); margin-bottom: 6px; }
.sector p { font-size: 0.87rem; color: var(--gris-oscuro); }

/* ---------- Estándares ---------- */
.standards-grid {
  display: grid; grid-template-columns: repeat(4, 1fr); gap: 18px; margin-top: 40px;
}
.standard {
  background: var(--blanco); border-radius: var(--radius-sm);
  border: 1px solid var(--gris-claro); padding: 22px;
  display: flex; flex-direction: column; gap: 4px;
  border-left: 3px solid var(--azul-electrico);
  transition: transform .2s ease, box-shadow .2s ease;
}
.standard:hover { transform: translateY(-3px); box-shadow: var(--shadow-sm); }
.standard strong { font-family: var(--font-display); font-weight: 700; color: var(--azul-corp); font-size: 1.05rem; }
.standard span { font-size: 0.85rem; color: var(--gris-oscuro); }

/* ---------- Casos ---------- */
.cases-grid { display: grid; grid-template-columns: repeat(3, 1fr); gap: 24px; margin-top: 40px; }
.case {
  background: rgba(255, 255, 255, 0.045);
  border: 1px solid rgba(124, 200, 255, 0.18);
  border-radius: var(--radius); padding: 34px 28px;
  display: flex; flex-direction: column; gap: 10px;
  transition: transform .25s ease, border-color .25s ease, background .25s ease;
}
.case:hover { transform: translateY(-5px); border-color: rgba(124, 200, 255, 0.45); background: rgba(255, 255, 255, 0.07); }
.case .icon-lg { stroke: var(--celeste); }
.case h3 { color: var(--blanco); }
.case-client { font-size: 0.85rem; color: var(--celeste); font-weight: 500; margin-top: -6px; }
.case p { color: var(--gris-medio); font-size: 0.97rem; }
.tag {
  align-self: flex-start; margin-top: auto;
  font-family: var(--font-display); font-weight: 600; font-size: 0.78rem;
  color: var(--celeste); border: 1px solid rgba(124, 200, 255, 0.4);
  padding: 5px 14px; border-radius: 999px;
}

/* ---------- Capacitación ---------- */
.check-list { margin: 8px 0 30px; display: flex; flex-direction: column; gap: 12px; }
.check-list li { padding-left: 34px; position: relative; color: var(--gris-oscuro); }
.check-list li::before {
  content: ""; position: absolute; left: 0; top: 3px; width: 20px; height: 20px;
  border-radius: 50%; background: var(--gris-claro);
  background-image: url("data:image/svg+xml,%3Csvg xmlns='http://www.w3.org/2000/svg' viewBox='0 0 24 24' fill='none' stroke='%232F80FF' stroke-width='3' stroke-linecap='round' stroke-linejoin='round'%3E%3Cpath d='m6 12 4 4 8-9'/%3E%3C/svg%3E");
  background-size: 12px; background-position: center; background-repeat: no-repeat;
}
.training-visual svg { width: 100%; height: auto; }

/* ---------- Contacto ---------- */
.section-contact {
  background:
    radial-gradient(800px 400px at 15% 0%, rgba(47, 128, 255, 0.16), transparent 60%),
    var(--marino);
  color: var(--blanco);
}
.contact-panel { display: grid; grid-template-columns: 1fr 1.2fr; gap: clamp(36px, 5vw, 70px); align-items: start; }
.contact-info p { color: var(--gris-medio); margin-bottom: 26px; }
.contact-list { display: flex; flex-direction: column; gap: 16px; }
.contact-list li { display: flex; align-items: center; gap: 14px; }
.contact-list .icon { stroke: var(--celeste); }
.contact-list a, .contact-list span { color: var(--blanco); font-weight: 500; }
.contact-list a:hover { color: var(--celeste); }

.contact-form {
  background: var(--blanco); border-radius: var(--radius);
  padding: clamp(26px, 3.5vw, 40px); box-shadow: var(--shadow);
  color: var(--negro);
}
.form-row { display: grid; grid-template-columns: 1fr 1fr; gap: 16px; }
.field { margin-bottom: 16px; display: flex; flex-direction: column; gap: 6px; }
.field label { font-family: var(--font-display); font-weight: 600; font-size: 0.83rem; color: var(--azul-corp); }
.field input, .field select, .field textarea {
  font-family: var(--font-body); font-size: 0.97rem; color: var(--negro);
  border: 1.5px solid var(--gris-medio); border-radius: var(--radius-sm);
  padding: 12px 14px; background: var(--blanco); width: 100%;
  transition: border-color .2s ease, box-shadow .2s ease;
}
.field input:focus, .field select:focus, .field textarea:focus {
  outline: none; border-color: var(--azul-electrico);
  box-shadow: 0 0 0 3px rgba(47, 128, 255, 0.18);
}
.field textarea { resize: vertical; }
.form-note { margin-top: 12px; font-size: 0.9rem; color: var(--azul-corp); text-align: center; min-height: 1.4em; }

/* ---------- Footer ---------- */
.site-footer { background: #050F24; color: var(--gris-medio); padding: 70px 0 0; }
.footer-grid {
  display: grid; grid-template-columns: 1.3fr 1fr 1fr 1fr; gap: 40px;
  padding-bottom: 50px; border-bottom: 1px solid rgba(124, 200, 255, 0.12);
}
.footer-logo { width: 170px; height: auto; margin-bottom: 16px; }
.footer-brand p { font-size: 0.92rem; max-width: 280px; }
.footer-col h3 {
  font-size: 0.95rem; color: var(--blanco); margin-bottom: 16px;
  font-weight: 700;
}
.footer-col ul { display: flex; flex-direction: column; gap: 10px; font-size: 0.92rem; }
.footer-col a { color: var(--gris-medio); transition: color .2s ease; }
.footer-col a:hover { color: var(--celeste); }
.footer-bottom {
  display: flex; justify-content: space-between; flex-wrap: wrap; gap: 10px;
  padding: 22px 24px; font-size: 0.83rem; color: var(--gris-oscuro);
}

/* ---------- Animaciones de aparición ----------
   Solo se ocultan si JS está activo (html.js), para no dejar
   contenido invisible sin JavaScript. */
.reveal { transition: opacity .7s ease, transform .7s ease; }
.js .reveal { opacity: 0; transform: translateY(24px); }
.js .reveal.visible { opacity: 1; transform: none; }

/* Escalonado dentro de grillas */
.cards-grid .reveal:nth-child(2), .sectors-grid .reveal:nth-child(2), .cases-grid .reveal:nth-child(2), .standards-grid .reveal:nth-child(2) { transition-delay: .08s; }
.cards-grid .reveal:nth-child(3), .sectors-grid .reveal:nth-child(3), .cases-grid .reveal:nth-child(3), .standards-grid .reveal:nth-child(3) { transition-delay: .16s; }
.cards-grid .reveal:nth-child(4), .sectors-grid .reveal:nth-child(4), .standards-grid .reveal:nth-child(4) { transition-delay: .24s; }
.sectors-grid .reveal:nth-child(5), .standards-grid .reveal:nth-child(5) { transition-delay: .08s; }
.sectors-grid .reveal:nth-child(6), .standards-grid .reveal:nth-child(6) { transition-delay: .16s; }
.sectors-grid .reveal:nth-child(7), .standards-grid .reveal:nth-child(7) { transition-delay: .24s; }
.sectors-grid .reveal:nth-child(8), .standards-grid .reveal:nth-child(8) { transition-delay: .32s; }

@media (prefers-reduced-motion: reduce) {
  html { scroll-behavior: auto; }
  .reveal { opacity: 1; transform: none; transition: none; }
  .btn, .card, .sector, .case, .standard { transition: none; }
  #circuitCanvas { display: none; }
}

/* ---------- Responsive ---------- */
@media (max-width: 1024px) {
  .cards-grid, .cases-grid { grid-template-columns: repeat(2, 1fr); }
  .sectors-grid, .standards-grid { grid-template-columns: repeat(2, 1fr); }
  .two-col, .contact-panel { grid-template-columns: 1fr; }
  .training-visual { max-width: 460px; }
}

/* Menú colapsado: el nav completo + marca necesitan ~1100px */
@media (max-width: 1080px) {
  .nav-toggle {
    display: flex; flex-direction: column; justify-content: center; gap: 5px;
    width: 46px; height: 46px; padding: 10px;
    background: none; border: none; cursor: pointer;
  }
  .nav-toggle span {
    display: block; height: 2.5px; width: 100%; border-radius: 3px;
    background: var(--azul-corp); transition: transform .25s ease, opacity .25s ease;
  }
  .nav-toggle[aria-expanded="true"] span:nth-child(1) { transform: translateY(7.5px) rotate(45deg); }
  .nav-toggle[aria-expanded="true"] span:nth-child(2) { opacity: 0; }
  .nav-toggle[aria-expanded="true"] span:nth-child(3) { transform: translateY(-7.5px) rotate(-45deg); }
  .nav-list {
    position: fixed; top: var(--header-h); left: 0; right: 0;
    flex-direction: column; align-items: stretch; gap: 0;
    background: var(--blanco); border-bottom: 1px solid var(--gris-claro);
    box-shadow: var(--shadow);
    padding: 12px 20px 20px;
    transform: translateY(-12px); opacity: 0; pointer-events: none;
    transition: transform .25s ease, opacity .25s ease;
  }
  .nav-list.open { transform: none; opacity: 1; pointer-events: auto; }
  .nav-link { padding: 14px 8px; }
  .nav-cta-item { margin: 10px 0 0; }
  .nav-cta-item .btn { width: 100%; justify-content: center; }
}

@media (max-width: 760px) {
  .brand-text small { display: none; }
  .brand-logo { height: 52px; }

  .hero-stats { grid-template-columns: repeat(2, 1fr); gap: 26px; }
  .cards-grid, .cases-grid { grid-template-columns: 1fr; }
  .form-row { grid-template-columns: 1fr; }
  .footer-grid { grid-template-columns: 1fr; gap: 32px; }
  .footer-bottom { flex-direction: column; text-align: center; }
}

@media (max-width: 480px) {
  .sectors-grid, .standards-grid { grid-template-columns: 1fr; }
}