/* ==========================================================================
   RR Software — landing page styles
   Paleta: azul cobalto + blanco, con acento celeste.
   Tipografía: Fraunces (títulos) + IBM Plex Sans (texto) + IBM Plex Mono (etiquetas)
   ========================================================================== */

/* Paleta fija de marca: azul + blanco, siempre igual sin importar el modo
   claro/oscuro del sistema del visitante (identidad de marca, no un tema de UI). */
:root {
  --bg: #F5F8FC;
  --surface: #FFFFFF;
  --surface-2: #ECF2FB;
  --ink: #0B1B2E;
  --muted: #55647D;
  --line: #DCE4F0;

  --brand: #1B4B91;
  --brand-strong: #0E2A52;
  --brand-2: #3DA9FC;

  --btn-primary-bg: #1B4B91;
  --btn-primary-bg-hover: #0E2A52;
  --btn-primary-text: #FFFFFF;

  --node-fill: #1B4B91;
  --node-core-fill: #3DA9FC;
  --line-color: #B9CBEA;

  --focus-ring: #3DA9FC;

  /* Tipografía */
  --font-display: "Fraunces", "Iowan Old Style", Georgia, serif;
  --font-body: "IBM Plex Sans", -apple-system, "Segoe UI", Roboto, sans-serif;
  --font-mono: "IBM Plex Mono", "SFMono-Regular", Menlo, monospace;

  --container: 1160px;
}

/* ---------- Reset base ---------- */
* { box-sizing: border-box; }
html { scroll-behavior: smooth; }
@media (prefers-reduced-motion: reduce) {
  html { scroll-behavior: auto; }
  * { animation-duration: 0.001ms !important; animation-iteration-count: 1 !important; transition-duration: 0.001ms !important; }
}

body {
  margin: 0;
  background: var(--bg);
  color: var(--ink);
  font-family: var(--font-body);
  font-size: 16px;
  line-height: 1.6;
  -webkit-font-smoothing: antialiased;
}

img { max-width: 100%; display: block; }
a { color: inherit; text-decoration: none; }

h1, h2, h3 {
  font-family: var(--font-display);
  font-weight: 600;
  line-height: 1.12;
  text-wrap: balance;
  margin: 0;
  color: var(--ink);
}

p { margin: 0; color: var(--muted); }

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

a:focus-visible, button:focus-visible {
  outline: 2px solid var(--focus-ring);
  outline-offset: 3px;
  border-radius: 4px;
}

.skip-link {
  position: absolute;
  left: -9999px;
  top: 0;
  background: var(--surface);
  color: var(--ink);
  padding: 12px 18px;
  z-index: 200;
  border-radius: 0 0 8px 0;
}
.skip-link:focus { left: 0; }

/* ---------- Eyebrow / labels ---------- */
.eyebrow {
  font-family: var(--font-mono);
  font-size: 0.78rem;
  letter-spacing: 0.09em;
  text-transform: uppercase;
  color: var(--brand);
  margin: 0 0 14px;
}
.eyebrow--center { text-align: center; }

.section-title { font-size: clamp(1.6rem, 1.2rem + 1.6vw, 2.35rem); max-width: 46ch; }
.section-title--center { text-align: center; margin-left: auto; margin-right: auto; }

.section-lead { max-width: 62ch; font-size: 1.05rem; margin-top: 14px; }
.section-lead--center { margin-left: auto; margin-right: auto; text-align: center; }

/* ---------- Buttons ---------- */
.btn {
  display: inline-flex;
  align-items: center;
  gap: 10px;
  font-family: var(--font-body);
  font-weight: 600;
  border-radius: 999px;
  border: 1px solid transparent;
  cursor: pointer;
  white-space: nowrap;
  transition: background-color 160ms ease, color 160ms ease, border-color 160ms ease, transform 160ms ease;
}
.btn--sm { padding: 9px 18px; font-size: 0.88rem; }
.btn--lg { padding: 14px 26px; font-size: 1rem; }

.btn--primary {
  background: var(--btn-primary-bg);
  color: var(--btn-primary-text);
}
.btn--primary:hover { background: var(--btn-primary-bg-hover); }
.btn--primary:active { transform: translateY(1px); }

.btn--ghost {
  background: transparent;
  color: var(--ink);
  border-color: var(--line);
}
.btn--ghost:hover { border-color: var(--brand); color: var(--brand); }

/* ---------- Navbar ---------- */
.navbar {
  position: sticky;
  top: 0;
  z-index: 100;
  background: color-mix(in srgb, var(--bg) 88%, transparent);
  backdrop-filter: saturate(160%) blur(10px);
  border-bottom: 1px solid transparent;
  transition: border-color 200ms ease, background-color 200ms ease;
}
.navbar.is-scrolled {
  border-bottom-color: var(--line);
  background: color-mix(in srgb, var(--bg) 96%, transparent);
}

.navbar__inner {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 24px;
  padding-top: 14px;
  padding-bottom: 14px;
}

.brand {
  display: flex;
  align-items: center;
  gap: 10px;
  font-family: var(--font-display);
  font-weight: 600;
  font-size: 1.15rem;
  color: var(--ink);
}
.brand__mark { color: var(--brand); display: inline-flex; }
.brand__mark img { display: block; width: 36px; height: 36px; mix-blend-mode: multiply; }
.footer .brand__mark img { width: 30px; height: 30px; }

.nav {
  display: flex;
  align-items: center;
  gap: 28px;
  font-size: 0.94rem;
  font-weight: 500;
}
.nav a { color: var(--muted); position: relative; padding: 4px 0; }
.nav a:hover, .nav a.is-active { color: var(--ink); }
.nav a.is-active::after {
  content: "";
  position: absolute;
  left: 0; right: 0; bottom: -2px;
  height: 2px;
  background: var(--brand-2);
  border-radius: 2px;
}

/* ---------- Menús desplegables del navbar (Empresa, Aprende) ---------- */
.nav__item { position: relative; }

.nav__trigger {
  position: relative;
  display: inline-flex;
  align-items: center;
  gap: 6px;
  padding: 4px 0;
  background: none;
  border: 0;
  cursor: pointer;
  font: inherit;
  color: var(--muted);
}
.nav__trigger:hover,
.nav__trigger.is-active,
.nav__item.is-open .nav__trigger { color: var(--ink); }
.nav__trigger.is-active::after {
  content: "";
  position: absolute;
  left: 0; right: 0; bottom: -2px;
  height: 2px;
  background: var(--brand-2);
  border-radius: 2px;
}

.nav__chevron { transition: transform 220ms ease; }
.nav__item.is-open .nav__chevron { transform: rotate(180deg); }

.dropdown {
  position: absolute;
  top: calc(100% + 16px);
  left: -22px;
  min-width: 260px;
  background: var(--surface);
  border: 1px solid var(--line);
  border-radius: 14px;
  box-shadow: 0 20px 44px -24px rgba(27, 75, 145, 0.3);
  opacity: 0;
  visibility: hidden;
  transform: translateY(-8px);
  transition: opacity 200ms ease, transform 200ms ease, visibility 0s linear 200ms;
}
/* Puente invisible para que el puntero no pierda el hover al cruzar el espacio */
.dropdown::before {
  content: "";
  position: absolute;
  left: 0; right: 0; top: -14px;
  height: 14px;
}
.nav__item.is-open .dropdown {
  opacity: 1;
  visibility: visible;
  transform: none;
  transition-delay: 0s;
}

.dropdown__inner { display: flex; flex-direction: column; gap: 2px; padding: 14px; }

.nav .dropdown a {
  padding: 11px 14px;
  border-radius: 10px;
  font-size: 1.02rem;
  font-weight: 600;
  color: var(--brand);
  transition: background-color 160ms ease, color 160ms ease, opacity 240ms ease, transform 240ms ease;
}
.nav .dropdown a:hover,
.nav .dropdown a:focus-visible { background: var(--surface-2); color: var(--brand-strong); }
.nav .dropdown a.is-active { background: var(--surface-2); color: var(--brand-strong); }
.nav .dropdown a.is-active::after { content: none; }

/* Escritorio: los ítems entran uno a uno al abrir el menú */
@media (min-width: 761px) {
  .nav .dropdown a { opacity: 0; transform: translateY(-6px); }
  .nav__item.is-open .dropdown a { opacity: 1; transform: none; }
  .nav__item.is-open .dropdown a:nth-child(1) { transition-delay: 0s, 0s, 60ms, 60ms; }
  .nav__item.is-open .dropdown a:nth-child(2) { transition-delay: 0s, 0s, 100ms, 100ms; }
  .nav__item.is-open .dropdown a:nth-child(3) { transition-delay: 0s, 0s, 140ms, 140ms; }
  .nav__item.is-open .dropdown a:nth-child(4) { transition-delay: 0s, 0s, 180ms, 180ms; }
}

.navbar__actions { display: flex; align-items: center; gap: 14px; }

.nav-toggle {
  display: none;
  flex-direction: column;
  justify-content: center;
  gap: 5px;
  width: 38px;
  height: 38px;
  background: transparent;
  border: 1px solid var(--line);
  border-radius: 8px;
}
.nav-toggle span {
  display: block;
  height: 2px;
  margin: 0 8px;
  background: var(--ink);
  border-radius: 2px;
  transition: transform 200ms ease, opacity 200ms ease;
}
.nav-toggle[aria-expanded="true"] span:nth-child(1) { transform: translateY(7px) rotate(45deg); }
.nav-toggle[aria-expanded="true"] span:nth-child(2) { opacity: 0; }
.nav-toggle[aria-expanded="true"] span:nth-child(3) { transform: translateY(-7px) rotate(-45deg); }

/* ---------- Hero ---------- */
.hero { padding: 72px 0 88px; }

.hero__grid {
  display: grid;
  grid-template-columns: minmax(0, 1fr) minmax(0, 0.85fr);
  gap: 56px;
  align-items: center;
}

.hero__lead { margin-top: 18px; font-size: 1.12rem; max-width: 52ch; }

h1 { font-size: clamp(2.2rem, 1.6rem + 2.6vw, 3.4rem); }
.ink-accent { color: var(--brand); }

.hero__cta {
  display: flex;
  flex-wrap: wrap;
  gap: 14px;
  margin-top: 32px;
}

.trust-row {
  list-style: none;
  display: flex;
  flex-wrap: wrap;
  gap: 10px 28px;
  margin: 36px 0 0;
  padding: 20px 0 0;
  border-top: 1px solid var(--line);
  font-size: 0.9rem;
  color: var(--muted);
}
.trust-row strong { color: var(--ink); font-family: var(--font-mono); font-weight: 600; }

.hero__art { position: relative; text-align: center; }
.network-svg { width: 100%; height: auto; max-width: 420px; }
.net-lines line { stroke: var(--line-color); stroke-width: 1.6; }
.net-nodes .node { fill: var(--node-fill); }
.net-nodes .node--core { fill: var(--node-core-fill); }
.net-nodes .node--home { fill: var(--surface); stroke: var(--node-fill); stroke-width: 2; }
.node-label { font-size: 22px; }
.node-label--core { font-size: 20px; }

/* Fondo del inicio: grabado que se funde con la página y se mueve suavemente */
.hero { position: relative; overflow: hidden; isolation: isolate; background: var(--bg); }
.hero__bg {
  position: absolute;
  inset: 0;
  z-index: -1;
  pointer-events: none;
  transform: translate3d(0, var(--hero-shift, 0px), 0);
  animation: hero-bg-in 1100ms ease-out;
}
.hero__bg-frame {
  position: absolute;
  right: -2%;
  bottom: 0;
  height: max(104%, 38vw);
  aspect-ratio: 1 / 1;
  overflow: hidden;
}
/* Los bordes izquierdo y superior se diluyen en el color de la página */
.hero__bg-frame::after {
  content: "";
  position: absolute;
  inset: -1px;
  background:
    linear-gradient(to right, var(--bg) 0, transparent 38%),
    linear-gradient(to bottom, var(--bg) 0, transparent 28%);
}
.hero__bg-img {
  display: block;
  width: 100%;
  height: 100%;
  max-width: none;
  mix-blend-mode: multiply;
  filter: saturate(0.75) brightness(1.06);
  transform-origin: 70% 60%;
  animation: hero-float 14s ease-in-out infinite alternate;
}
@keyframes hero-bg-in { from { opacity: 0; } to { opacity: 1; } }
@keyframes hero-float {
  from { transform: translate3d(0, 0, 0) scale(1.02); }
  to { transform: translate3d(-12px, -10px, 0) scale(1.06); }
}
@media (max-width: 980px) {
  .hero__bg-frame { right: -18%; height: 82%; opacity: 0.25; }
}

.hero__illustration { display: block; width: 100%; height: auto; }

.hero__art-caption {
  font-family: var(--font-mono);
  font-size: 0.82rem;
  color: var(--muted);
  margin-top: 6px;
}

/* ---------- Services ---------- */
.services { padding: 88px 0; background: var(--surface); border-top: 1px solid var(--line); border-bottom: 1px solid var(--line); }

.service-row {
  display: grid;
  grid-template-columns: 96px minmax(0, 1fr);
  gap: 8px 28px;
  align-items: start;
  padding: 30px 0;
}
.service-row + .service-row { border-top: 1px solid var(--line); }

.service-row__num {
  font-family: var(--font-mono);
  font-size: 1rem;
  font-weight: 600;
  color: var(--brand-2);
  padding-top: 4px;
}
.service-row__body h3 { font-size: 1.3rem; margin-bottom: 8px; }
.service-row__body p { max-width: 62ch; }

.services > .wrap > .section-lead { margin-bottom: 44px; }

.service-group + .service-group { margin-top: 56px; }
.service-group__label {
  font-family: var(--font-mono);
  font-size: 0.78rem;
  letter-spacing: 0.09em;
  text-transform: uppercase;
  color: var(--brand);
  padding-bottom: 14px;
  border-bottom: 2px solid var(--brand-2);
}

/* ---------- Process ---------- */
.process { padding: 88px 0; }
.process > .wrap > .section-title { margin-bottom: 8px; }
.process > .wrap > .eyebrow--center + .section-title { margin-bottom: 52px; }

.process-list {
  list-style: none;
  margin: 0;
  padding: 0;
  display: grid;
  grid-template-columns: repeat(4, minmax(0, 1fr));
  gap: 0;
  position: relative;
}

.process-step {
  position: relative;
  padding: 0 20px 0 0;
  border-left: 2px solid var(--line);
  padding-left: 22px;
}
.process-step:first-child { border-left: none; padding-left: 0; }

.process-step__num {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  width: 34px;
  height: 34px;
  border-radius: 50%;
  background: var(--brand);
  color: var(--btn-primary-text);
  font-family: var(--font-mono);
  font-weight: 600;
  font-size: 0.95rem;
  margin-bottom: 16px;
}

.process-step h3 { font-size: 1.08rem; margin-bottom: 8px; }
.process-step p { font-size: 0.95rem; }

/* ---------- Audience ---------- */
.audience { padding: 88px 0; background: var(--surface-2); }

.audience__grid {
  display: grid;
  grid-template-columns: minmax(0, 0.9fr) minmax(0, 1.1fr);
  gap: 56px;
  align-items: start;
}

.audience__compare {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 20px;
}

.compare-card {
  background: var(--surface);
  border: 1px solid var(--line);
  border-radius: 16px;
  padding: 26px;
}
.compare-card--accent { border-color: var(--brand-2); }

.compare-card__label {
  font-family: var(--font-mono);
  font-size: 0.78rem;
  letter-spacing: 0.06em;
  text-transform: uppercase;
  color: var(--muted);
  margin-bottom: 14px;
}
.compare-card--accent .compare-card__label { color: var(--brand); }

.compare-card ul { margin: 0; padding: 0; list-style: none; display: grid; gap: 14px; }
.compare-card li {
  font-size: 0.95rem;
  color: var(--ink);
  padding-left: 20px;
  position: relative;
}
.compare-card li::before {
  content: "";
  position: absolute;
  left: 0; top: 8px;
  width: 8px; height: 8px;
  border-radius: 50%;
  background: var(--line);
}
.compare-card--accent li::before { background: var(--brand-2); }

/* ---------- Model / pricing ---------- */
.model { padding: 88px 0; }
.model > .wrap > .section-title { margin-bottom: 8px; }

.model-steps {
  display: grid;
  grid-template-columns: repeat(3, minmax(0, 1fr));
  gap: 24px;
  margin-top: 52px;
}

.model-step {
  background: var(--surface);
  border: 1px solid var(--line);
  border-radius: 16px;
  padding: 28px;
}

.model-step__tag {
  display: inline-block;
  font-family: var(--font-mono);
  font-size: 0.78rem;
  letter-spacing: 0.06em;
  text-transform: uppercase;
  color: var(--brand-2);
  margin-bottom: 14px;
}

.model-step h3 { font-size: 1.1rem; margin-bottom: 10px; }
.model-step p { font-size: 0.95rem; }

/* ---------- CTA final ---------- */
.cta-final {
  padding: 96px 0;
  background: var(--brand-strong);
  color: #fff;
}
.cta-final__inner { max-width: 640px; margin: 0 auto; text-align: center; }
.cta-final h2 { color: #fff; font-size: clamp(1.6rem, 1.2rem + 1.6vw, 2.3rem); }
.cta-final p { color: color-mix(in srgb, #fff 78%, transparent); margin-top: 16px; }
.cta-final .btn--primary { margin-top: 30px; }
.cta-final__note { margin-top: 18px; font-size: 0.9rem; }
.cta-final__note a { text-decoration: underline; color: #fff; }

/* ---------- Footer ---------- */
.footer { background: var(--surface); border-top: 1px solid var(--line); padding: 60px 0 0; }

.footer__inner {
  display: grid;
  grid-template-columns: 1.2fr 1fr 1fr;
  gap: 40px;
  padding-bottom: 44px;
}

.footer__brand p { margin-top: 14px; font-size: 0.92rem; max-width: 32ch; }

.footer__links, .footer__contact { display: flex; flex-direction: column; gap: 12px; font-size: 0.92rem; }
.footer__links a, .footer__contact a { color: var(--muted); }
.footer__links a:hover, .footer__contact a:hover { color: var(--brand); }

.footer__label {
  font-family: var(--font-mono);
  font-size: 0.78rem;
  letter-spacing: 0.06em;
  text-transform: uppercase;
  color: var(--muted);
  margin: 0 0 2px;
}

.social { display: flex; flex-wrap: wrap; gap: 8px; margin-top: 8px; }
.social a {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  width: 44px; height: 44px;
  border-radius: 12px;
  border: 1px solid var(--line);
  font-family: var(--font-mono);
  font-size: 0.78rem;
  font-weight: 600;
  color: var(--muted);
  transition: border-color 160ms ease, color 160ms ease, background-color 160ms ease;
}
.social a:hover { border-color: var(--brand); color: var(--brand); background: var(--surface-2); }
.social__icon svg { display: block; width: 24px; height: 24px; }

.footer__bottom {
  border-top: 1px solid var(--line);
  padding: 20px 0;
  font-size: 0.85rem;
  color: var(--muted);
}

/* ---------- Reveal-on-scroll (progressive enhancement) ---------- */
.js-enhanced .reveal {
  opacity: 0;
  transform: translateY(16px);
  transition: opacity 560ms ease, transform 560ms ease;
}
.js-enhanced .reveal.is-visible {
  opacity: 1;
  transform: none;
}

/* ---------- Responsive ---------- */
@media (max-width: 980px) {
  .hero__grid { grid-template-columns: 1fr; }
  .hero__art { order: -1; max-width: 320px; margin: 0 auto; }
  .audience__grid { grid-template-columns: 1fr; }
  .model-steps { grid-template-columns: 1fr; }
  .footer__inner { grid-template-columns: 1fr 1fr; }
}

@media (max-width: 760px) {
  .nav {
    position: absolute;
    top: 100%; left: 0; right: 0;
    background: var(--bg);
    border-bottom: 1px solid var(--line);
    flex-direction: column;
    align-items: flex-start;
    gap: 4px;
    padding: 16px 24px 24px;
    display: none;
  }
  .nav.is-open { display: flex; }
  .nav a { width: 100%; padding: 10px 0; }

  /* Desplegables tipo acordeón dentro del menú móvil */
  .nav__item { width: 100%; }
  .nav__trigger { width: 100%; justify-content: space-between; padding: 10px 0; }
  .nav__trigger.is-active::after { content: none; }
  .dropdown {
    position: static;
    min-width: 0;
    background: transparent;
    border: 0;
    border-radius: 0;
    box-shadow: none;
    display: grid;
    grid-template-rows: 0fr;
    opacity: 1;
    visibility: visible;
    transform: none;
    transition: grid-template-rows 260ms ease;
  }
  .dropdown::before { content: none; }
  .nav__item.is-open .dropdown { grid-template-rows: 1fr; }
  .dropdown__inner {
    min-height: 0;
    overflow: hidden;
    padding: 0 0 0 14px;
    margin-left: 2px;
    border-left: 2px solid var(--line);
    visibility: hidden;
    transition: visibility 0s linear 260ms;
  }
  .nav__item.is-open .dropdown__inner { visibility: visible; transition-delay: 0s; }
  .nav-toggle { display: flex; }
  .navbar__actions .btn--sm { display: none; }

  .process-list { grid-template-columns: 1fr; gap: 28px; }
  .process-step { border-left: none; padding-left: 0; padding-top: 22px; border-top: 2px solid var(--line); }
  .process-step:first-child { border-top: none; padding-top: 0; }

  .service-row { grid-template-columns: 1fr; gap: 8px; }

  .audience__compare { grid-template-columns: 1fr; }

  .footer__inner { grid-template-columns: 1fr; }
}

/* ==========================================================================
   Página "Inteligencia artificial" (ia.html)
   ========================================================================== */
.ia-hero { padding: 72px 0 56px; }
.ia-hero h1 { max-width: 22ch; }
.ia-hero .hero__lead { max-width: 58ch; }

.ia-section { padding: 80px 0; }
.ia-section--surface {
  background: var(--surface);
  border-top: 1px solid var(--line);
  border-bottom: 1px solid var(--line);
}
.ia-section--flush-bottom { padding-bottom: 24px; }
.ia-section--flush-top { padding-top: 24px; }

/* ¿Qué es la IA? */
.ia-define {
  display: grid;
  grid-template-columns: minmax(0, 1.1fr) minmax(0, 0.9fr);
  gap: 56px;
  align-items: center;
}
.ia-define__text { display: grid; gap: 14px; margin-top: 18px; max-width: 58ch; }
.ia-define__quote {
  font-family: var(--font-display);
  font-weight: 500;
  font-size: clamp(1.3rem, 1.05rem + 1vw, 1.75rem);
  line-height: 1.3;
  color: var(--brand);
  text-wrap: balance;
  padding-left: 22px;
  border-left: 3px solid var(--brand-2);
}

/* Beneficios */
.ia-benefits {
  display: grid;
  grid-template-columns: repeat(3, minmax(0, 1fr));
  gap: 36px;
  margin-top: 44px;
}
.ia-benefit { border-top: 1px solid var(--line); padding-top: 20px; }
.ia-benefit h3 { font-size: 1.15rem; margin-bottom: 8px; }
.ia-benefit p { font-size: 0.97rem; }

/* Ejemplos: chatbot y agente */
.ia-examples { margin-top: 36px; }
.ia-example {
  display: grid;
  grid-template-columns: minmax(0, 1fr) minmax(0, 1fr);
  gap: 56px;
  align-items: center;
  padding: 48px 0;
}
.ia-example + .ia-example { border-top: 1px solid var(--line); }
.ia-example--flip .ia-example__visual { order: -1; }
.ia-example__body h3 { font-size: 1.45rem; margin-bottom: 12px; }
.ia-example__body > p { max-width: 54ch; }

.ia-list { list-style: none; margin: 20px 0 0; padding: 0; display: grid; gap: 12px; }
.ia-list li {
  position: relative;
  padding-left: 22px;
  font-size: 0.96rem;
  color: var(--ink);
}
.ia-list li::before {
  content: "";
  position: absolute;
  left: 0; top: 9px;
  width: 8px; height: 8px;
  border-radius: 50%;
  background: var(--brand-2);
}

/* Conversación de ejemplo */
.chat {
  width: 100%;
  max-width: 440px;
  justify-self: center;
  display: grid;
  gap: 10px;
  padding: 20px;
  background: var(--surface);
  border: 1px solid var(--line);
  border-radius: 16px;
}
.chat__label {
  font-family: var(--font-mono);
  font-size: 0.72rem;
  letter-spacing: 0.06em;
  text-transform: uppercase;
  color: var(--muted);
  margin-bottom: 4px;
}
.msg {
  max-width: 84%;
  padding: 10px 14px;
  font-size: 0.92rem;
  line-height: 1.45;
  border-radius: 14px;
}
.msg--user {
  justify-self: end;
  background: var(--btn-primary-bg);
  color: var(--btn-primary-text);
  border-bottom-right-radius: 4px;
}
.msg--bot {
  justify-self: start;
  background: var(--surface-2);
  color: var(--ink);
  border-bottom-left-radius: 4px;
}
.chat__actions {
  list-style: none;
  margin: 6px 0 0;
  padding: 14px 0 0;
  display: grid;
  gap: 8px;
  border-top: 1px dashed var(--line);
  font-size: 0.86rem;
  color: var(--muted);
}
.chat__actions li::before {
  content: "\2713";
  margin-right: 8px;
  font-weight: 700;
  color: var(--brand);
}

@media (max-width: 980px) {
  .ia-define,
  .ia-example { grid-template-columns: 1fr; gap: 32px; }
  .ia-example--flip .ia-example__visual { order: 0; }
  .ia-benefits { grid-template-columns: 1fr; gap: 28px; }
}

/* ---------- Botón flotante: ir al inicio / al final ---------- */
.scroll-nav {
  position: fixed;
  right: 20px;
  bottom: 20px;
  z-index: 90;
  display: inline-flex;
  align-items: center;
  justify-content: center;
  width: 48px;
  height: 48px;
  padding: 0;
  border-radius: 50%;
  border: 1px solid var(--line);
  background: var(--surface);
  color: var(--brand);
  cursor: pointer;
  box-shadow: 0 12px 26px -14px rgba(27, 75, 145, 0.5);
  transition: background-color 160ms ease, color 160ms ease, border-color 160ms ease, box-shadow 160ms ease;
}
.scroll-nav svg { display: block; transition: transform 260ms ease; }
.scroll-nav.is-up svg { transform: rotate(180deg); }
.scroll-nav:hover {
  background: var(--btn-primary-bg);
  border-color: var(--btn-primary-bg);
  color: var(--btn-primary-text);
}
.scroll-nav.is-hidden { display: none; }

@media (max-width: 760px) {
  .scroll-nav { right: 14px; bottom: 14px; width: 44px; height: 44px; }
}