/* Contabilidad IA — estilos globales */
:root {
  --azul: #1565c0;
  --azul-osc: #0d3c75;
  --azul-claro: #e3f0fc;
  --gris: #f4f6f9;
  --gris-borde: #e2e8f0;
  --texto: #1a2333;
  --texto-suave: #5a6678;
  --blanco: #ffffff;
  --wa: #25d366;
  --wa-osc: #1da851;
  --radio: 14px;
  --sombra: 0 6px 24px rgba(13, 60, 117, 0.08);
  --max: 1080px;
}

* { margin: 0; padding: 0; box-sizing: border-box; }

html { scroll-behavior: smooth; }

body {
  font-family: -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, Helvetica, Arial, sans-serif;
  color: var(--texto);
  background: var(--blanco);
  line-height: 1.6;
  -webkit-font-smoothing: antialiased;
}

a { color: var(--azul); text-decoration: none; }
a:hover { text-decoration: underline; }

.contenedor {
  width: 100%;
  max-width: var(--max);
  margin: 0 auto;
  padding: 0 20px;
}

/* ---------- Header ---------- */
.site-header {
  position: sticky;
  top: 0;
  z-index: 50;
  background: rgba(255, 255, 255, 0.92);
  backdrop-filter: saturate(180%) blur(8px);
  border-bottom: 1px solid var(--gris-borde);
}
.nav {
  display: flex;
  align-items: center;
  justify-content: space-between;
  height: 64px;
}
.brand {
  display: flex;
  align-items: center;
  gap: 10px;
  font-weight: 700;
  font-size: 1.15rem;
  color: var(--azul-osc);
}
.brand:hover { text-decoration: none; }
.brand .logo {
  display: grid;
  place-items: center;
  width: 36px;
  height: 36px;
  border-radius: 9px;
  background: linear-gradient(135deg, var(--azul), var(--azul-osc));
  color: #fff;
  font-weight: 800;
  font-size: 0.95rem;
}
.nav-cta {
  display: inline-flex;
  align-items: center;
  gap: 8px;
  background: var(--wa);
  color: #fff;
  padding: 9px 16px;
  border-radius: 999px;
  font-weight: 600;
  font-size: 0.92rem;
}
.nav-cta:hover { background: var(--wa-osc); text-decoration: none; }

/* ---------- Hero ---------- */
.hero {
  background: linear-gradient(160deg, var(--azul-claro) 0%, #ffffff 70%);
  padding: 72px 0 64px;
  text-align: center;
}
.hero h1 {
  font-size: clamp(2.2rem, 7vw, 3.4rem);
  line-height: 1.1;
  letter-spacing: -0.02em;
  color: var(--azul-osc);
  margin-bottom: 16px;
}
.hero .sub {
  font-size: clamp(1.05rem, 3.4vw, 1.4rem);
  color: var(--texto-suave);
  max-width: 640px;
  margin: 0 auto 32px;
}
.btn-wa {
  display: inline-flex;
  align-items: center;
  gap: 10px;
  background: var(--wa);
  color: #fff;
  font-weight: 700;
  font-size: 1.1rem;
  padding: 16px 30px;
  border-radius: 999px;
  box-shadow: 0 8px 20px rgba(37, 211, 102, 0.35);
  transition: transform 0.15s ease, box-shadow 0.15s ease;
}
.btn-wa:hover {
  text-decoration: none;
  transform: translateY(-2px);
  box-shadow: 0 12px 26px rgba(37, 211, 102, 0.45);
}
.btn-wa svg { width: 22px; height: 22px; }
.hero .nota {
  margin-top: 14px;
  font-size: 0.9rem;
  color: var(--texto-suave);
}

/* ---------- Features ---------- */
.features {
  padding: 64px 0;
  background: var(--blanco);
}
.section-title {
  text-align: center;
  font-size: clamp(1.6rem, 5vw, 2.1rem);
  color: var(--azul-osc);
  margin-bottom: 8px;
}
.section-lead {
  text-align: center;
  color: var(--texto-suave);
  max-width: 620px;
  margin: 0 auto 44px;
}
.grid {
  display: grid;
  grid-template-columns: 1fr;
  gap: 20px;
}
.card {
  background: var(--gris);
  border: 1px solid var(--gris-borde);
  border-radius: var(--radio);
  padding: 26px 24px;
  box-shadow: var(--sombra);
}
.card .ico {
  display: grid;
  place-items: center;
  width: 48px;
  height: 48px;
  border-radius: 12px;
  background: var(--azul-claro);
  color: var(--azul);
  margin-bottom: 16px;
}
.card .ico svg { width: 26px; height: 26px; }
.card h3 {
  font-size: 1.15rem;
  color: var(--texto);
  margin-bottom: 8px;
}
.card p { color: var(--texto-suave); font-size: 0.98rem; }

/* ---------- Ejemplos ---------- */
.ejemplos {
  padding: 64px 0;
  background: linear-gradient(180deg, #ffffff, var(--gris));
}
.chat {
  max-width: 460px;
  margin: 0 auto;
  background: #fff;
  border: 1px solid var(--gris-borde);
  border-radius: 20px;
  padding: 22px;
  box-shadow: var(--sombra);
}
.bubble {
  max-width: 80%;
  padding: 11px 15px;
  border-radius: 16px;
  margin-bottom: 12px;
  font-size: 0.97rem;
  line-height: 1.45;
}
.bubble.user {
  margin-left: auto;
  background: #d9fdd3;
  color: #102a1c;
  border-bottom-right-radius: 4px;
}
.bubble.bot {
  background: var(--gris);
  color: var(--texto);
  border-bottom-left-radius: 4px;
}

/* ---------- CTA final ---------- */
.cta-final {
  padding: 72px 0;
  text-align: center;
  background: linear-gradient(135deg, var(--azul), var(--azul-osc));
  color: #fff;
}
.cta-final h2 {
  font-size: clamp(1.7rem, 5vw, 2.3rem);
  margin-bottom: 14px;
}
.cta-final p {
  color: rgba(255, 255, 255, 0.85);
  max-width: 560px;
  margin: 0 auto 30px;
}
.cta-final .btn-wa { box-shadow: 0 10px 28px rgba(0, 0, 0, 0.25); }

/* ---------- Footer ---------- */
.site-footer {
  background: var(--azul-osc);
  color: rgba(255, 255, 255, 0.82);
  padding: 36px 0;
  font-size: 0.92rem;
}
.footer-row {
  display: flex;
  flex-wrap: wrap;
  align-items: center;
  justify-content: space-between;
  gap: 14px;
}
.footer-links {
  display: flex;
  flex-wrap: wrap;
  gap: 18px;
}
.site-footer a { color: #fff; opacity: 0.9; }
.site-footer a:hover { opacity: 1; }

/* ---------- Páginas legales ---------- */
.legal {
  padding: 56px 0 72px;
  max-width: 800px;
}
.legal h1 {
  font-size: clamp(1.8rem, 5vw, 2.4rem);
  color: var(--azul-osc);
  margin-bottom: 8px;
}
.legal .updated {
  color: var(--texto-suave);
  font-size: 0.9rem;
  margin-bottom: 32px;
}
.legal h2 {
  font-size: 1.25rem;
  color: var(--azul-osc);
  margin: 30px 0 10px;
}
.legal p, .legal li { color: var(--texto); margin-bottom: 12px; }
.legal ul { padding-left: 22px; }
.legal .back {
  display: inline-block;
  margin-bottom: 28px;
  font-weight: 600;
}
.callout {
  background: var(--azul-claro);
  border-left: 4px solid var(--azul);
  border-radius: 8px;
  padding: 16px 18px;
  margin: 22px 0;
}

/* ---------- Responsive ---------- */
@media (min-width: 720px) {
  .grid { grid-template-columns: repeat(2, 1fr); }
}
@media (min-width: 980px) {
  .grid { grid-template-columns: repeat(4, 1fr); }
}
@media (max-width: 520px) {
  .nav-cta span { display: none; }
  .footer-row { flex-direction: column; text-align: center; }
}