/* ProntoFactura — sitio público. Sin dependencias externas. */
:root {
  --verde: #1ab394;
  --verde-osc: #11866f;
  --azul: #138dce;
  --azul-osc: #0d6fa5;
  --tinta: #0f2530;
  --texto: #3a4d57;
  --suave: #6b7d87;
  --linea: #e3eaee;
  --fondo: #ffffff;
  --fondo-alt: #f4f8fa;
  --radio: 14px;
  --sombra: 0 1px 2px rgba(15, 37, 48, .06), 0 8px 24px rgba(15, 37, 48, .08);
  --max: 1120px;
  font-size: 16px;
}

*, *::before, *::after { box-sizing: border-box; }
html { scroll-behavior: smooth; scroll-padding-top: 80px; }
body {
  margin: 0;
  font-family: system-ui, -apple-system, "Segoe UI", Roboto, "Helvetica Neue", Arial, sans-serif;
  color: var(--texto);
  background: var(--fondo);
  line-height: 1.6;
  -webkit-font-smoothing: antialiased;
}
img { max-width: 100%; display: block; }
a { color: var(--azul-osc); }
h1, h2, h3 { color: var(--tinta); line-height: 1.2; margin: 0 0 .5em; letter-spacing: -.01em; }
h1 { font-size: clamp(2.1rem, 4.6vw, 3.4rem); letter-spacing: -.025em; }
h2 { font-size: clamp(1.6rem, 3vw, 2.3rem); letter-spacing: -.02em; }
h3 { font-size: 1.1rem; }
p { margin: 0 0 1em; }

.contenedor { width: min(100% - 2.5rem, var(--max)); margin-inline: auto; }
.seccion { padding: clamp(3.5rem, 8vw, 6rem) 0; }
.seccion.alt { background: var(--fondo-alt); }
.encabezado { max-width: 680px; margin: 0 auto 3rem; text-align: center; }
.encabezado p { font-size: 1.1rem; color: var(--suave); }
.etiqueta {
  display: inline-block; font-size: .8rem; font-weight: 700; letter-spacing: .08em;
  text-transform: uppercase; color: var(--verde-osc); margin-bottom: .75rem;
}

/* Botones */
.btn {
  display: inline-flex; align-items: center; justify-content: center; gap: .5rem;
  padding: .8rem 1.4rem; border-radius: 10px; font-weight: 650; font-size: 1rem;
  text-decoration: none; border: 1.5px solid transparent; cursor: pointer;
  transition: background .15s, border-color .15s, transform .15s;
}
.btn:hover { transform: translateY(-1px); }
.btn-primario { background: var(--verde); color: #fff; }
.btn-primario:hover { background: var(--verde-osc); }
.btn-secundario { background: #fff; color: var(--tinta); border-color: var(--linea); }
.btn-secundario:hover { border-color: #c5d3da; }
.btn-chico { padding: .55rem 1rem; font-size: .95rem; }

/* Navegación */
.nav {
  position: sticky; top: 0; z-index: 50; background: rgba(255, 255, 255, .92);
  backdrop-filter: saturate(180%) blur(10px); border-bottom: 1px solid var(--linea);
}
.nav .contenedor { display: flex; align-items: center; gap: 1.5rem; height: 68px; }
.marca { display: flex; align-items: center; gap: .6rem; text-decoration: none; color: var(--tinta); font-weight: 800; font-size: 1.2rem; letter-spacing: -.02em; }
.marca img { width: 38px; height: auto; }
.marca span b { color: var(--verde); font-weight: 800; }
.nav-links { display: flex; gap: 1.5rem; margin-left: auto; align-items: center; }
.nav-links a { color: var(--texto); text-decoration: none; font-weight: 550; font-size: .95rem; }
.nav-links a:hover { color: var(--tinta); }
.nav-acciones { display: flex; gap: .6rem; align-items: center; }
.nav-toggle { display: none; margin-left: auto; background: none; border: 0; padding: .5rem; cursor: pointer; color: var(--tinta); }
.nav-toggle svg { width: 26px; height: 26px; }

@media (max-width: 880px) {
  .nav-toggle { display: block; }
  .nav-links, .nav-acciones { display: none; }
  .nav.abierto .contenedor { flex-wrap: wrap; height: auto; padding: .9rem 0; }
  .nav.abierto .nav-links, .nav.abierto .nav-acciones {
    display: flex; flex-direction: column; align-items: stretch; width: 100%; margin: 0; gap: .25rem;
  }
  .nav.abierto .nav-links a { padding: .6rem 0; border-bottom: 1px solid var(--linea); }
  .nav.abierto .nav-acciones { padding: .75rem 0 .25rem; }
}

/* Hero */
.hero { padding: clamp(3rem, 7vw, 5.5rem) 0 clamp(3rem, 6vw, 5rem); background:
  radial-gradient(900px 420px at 85% 10%, rgba(19, 141, 206, .10), transparent 60%),
  radial-gradient(700px 380px at 5% 90%, rgba(26, 179, 148, .10), transparent 60%); }
.hero .contenedor { display: grid; grid-template-columns: 1.05fr .95fr; gap: 3.5rem; align-items: center; }
.hero p.lead { font-size: clamp(1.1rem, 1.6vw, 1.25rem); color: var(--suave); max-width: 540px; }
.hero .acciones { display: flex; gap: .75rem; flex-wrap: wrap; margin: 1.75rem 0 1.25rem; }
.hero .nota { font-size: .9rem; color: var(--suave); }
.resaltado { background: linear-gradient(90deg, var(--verde), var(--azul)); -webkit-background-clip: text; background-clip: text; color: transparent; }
@media (max-width: 880px) { .hero .contenedor { grid-template-columns: 1fr; } }

/* Mockup del hero: chat + factura */
.demo { position: relative; }
.chat {
  background: #fff; border: 1px solid var(--linea); border-radius: 18px; box-shadow: var(--sombra);
  padding: 1.25rem; font-size: .95rem;
}
.chat-top { display: flex; align-items: center; gap: .5rem; font-size: .8rem; color: var(--suave); margin-bottom: 1rem; }
.punto { width: 8px; height: 8px; border-radius: 50%; background: var(--verde); }
.burbuja { padding: .75rem 1rem; border-radius: 14px; margin-bottom: .75rem; max-width: 88%; }
.burbuja.yo { background: var(--tinta); color: #fff; margin-left: auto; border-bottom-right-radius: 4px; }
.burbuja.ia { background: var(--fondo-alt); color: var(--texto); border-bottom-left-radius: 4px; }
.herramienta { display: inline-flex; align-items: center; gap: .4rem; font-size: .78rem; font-family: ui-monospace, SFMono-Regular, Menlo, monospace; color: var(--verde-osc); background: rgba(26, 179, 148, .1); padding: .2rem .55rem; border-radius: 6px; margin-bottom: .5rem; }
.factura {
  margin-top: .25rem; border: 1px solid var(--linea); border-radius: 12px; padding: .9rem 1rem; background: #fff;
  font-size: .88rem; display: grid; grid-template-columns: 1fr auto; gap: .2rem .75rem;
}
.factura .folio { font-weight: 700; color: var(--tinta); }
.factura .ok { color: var(--verde-osc); font-weight: 700; text-align: right; }
.factura .total { font-weight: 800; color: var(--tinta); font-size: 1.05rem; text-align: right; }
.factura .gris { color: var(--suave); }

/* Cifras */
.cifras { border-block: 1px solid var(--linea); background: #fff; }
.cifras .contenedor { display: grid; grid-template-columns: repeat(4, 1fr); gap: 1rem; padding: 1.75rem 0; text-align: center; }
.cifras strong { display: block; font-size: 1.6rem; color: var(--tinta); letter-spacing: -.02em; }
.cifras span { font-size: .9rem; color: var(--suave); }
@media (max-width: 720px) { .cifras .contenedor { grid-template-columns: repeat(2, 1fr); row-gap: 1.5rem; } }

/* Tarjetas de funciones */
.grid { display: grid; gap: 1.25rem; }
.grid-3 { grid-template-columns: repeat(3, 1fr); }
@media (max-width: 960px) { .grid-3 { grid-template-columns: repeat(2, 1fr); } }
@media (max-width: 620px) { .grid-3 { grid-template-columns: 1fr; } }
.tarjeta { background: #fff; border: 1px solid var(--linea); border-radius: var(--radio); padding: 1.5rem; }
.tarjeta p { margin: 0; font-size: .97rem; }
.icono {
  width: 44px; height: 44px; border-radius: 11px; display: grid; place-items: center; margin-bottom: 1rem;
  background: linear-gradient(135deg, rgba(26, 179, 148, .14), rgba(19, 141, 206, .14)); color: var(--azul-osc);
}
.icono svg { width: 22px; height: 22px; }

/* Bloque IA */
.ia .contenedor { display: grid; grid-template-columns: .95fr 1.05fr; gap: 3.5rem; align-items: center; }
@media (max-width: 880px) { .ia .contenedor { grid-template-columns: 1fr; } }
.lista-check { list-style: none; padding: 0; margin: 1.5rem 0; }
.lista-check li { position: relative; padding-left: 1.9rem; margin-bottom: .85rem; }
.lista-check li::before {
  content: ""; position: absolute; left: 0; top: .2rem; width: 1.2rem; height: 1.2rem; border-radius: 50%;
  background: var(--verde) url("data:image/svg+xml,%3Csvg xmlns='http://www.w3.org/2000/svg' viewBox='0 0 24 24' fill='none' stroke='white' stroke-width='3.5' stroke-linecap='round' stroke-linejoin='round'%3E%3Cpath d='M5 12l5 5L20 7'/%3E%3C/svg%3E") center / 70% no-repeat;
}
.logos-ia { display: flex; gap: .6rem; flex-wrap: wrap; margin-top: 1rem; }
.pastilla { font-size: .85rem; font-weight: 600; padding: .35rem .8rem; border-radius: 999px; border: 1px solid var(--linea); background: #fff; color: var(--tinta); }

/* Precios */
.precios { grid-template-columns: repeat(3, 1fr); align-items: stretch; }
@media (max-width: 880px) { .precios { grid-template-columns: 1fr; max-width: 440px; margin-inline: auto; } }
.plan { display: flex; flex-direction: column; position: relative; }
.plan.destacado { border: 2px solid var(--verde); box-shadow: var(--sombra); }
.plan .badge { position: absolute; top: -12px; left: 50%; transform: translateX(-50%); background: var(--verde); color: #fff; font-size: .75rem; font-weight: 700; padding: .25rem .75rem; border-radius: 999px; white-space: nowrap; }
.plan h3 { font-size: 1.05rem; color: var(--suave); font-weight: 650; }
.precio { font-size: 2.4rem; font-weight: 800; color: var(--tinta); letter-spacing: -.03em; line-height: 1; margin: .25rem 0 .35rem; }
.precio small { font-size: .95rem; font-weight: 600; color: var(--suave); letter-spacing: 0; }
.plan .timbres { font-weight: 650; color: var(--tinta); }
.plan .unitario { color: var(--suave); font-size: .92rem; margin-bottom: 1.25rem; }
.plan .btn { margin-top: auto; }
.letra-chica { text-align: center; color: var(--suave); font-size: .92rem; margin-top: 1.75rem; }

/* FAQ */
.faq { max-width: 760px; margin: 0 auto; }
.faq details { border-bottom: 1px solid var(--linea); padding: 1.1rem 0; }
.faq summary { cursor: pointer; font-weight: 650; color: var(--tinta); list-style: none; display: flex; justify-content: space-between; gap: 1rem; }
.faq summary::-webkit-details-marker { display: none; }
.faq summary::after { content: "+"; font-size: 1.4rem; line-height: 1; color: var(--suave); }
.faq details[open] summary::after { content: "–"; }
.faq details p { margin: .75rem 0 0; }

/* CTA final */
.cta { background: linear-gradient(135deg, #0f2530, #123a4c); color: #cfe0e7; text-align: center; }
.cta h2 { color: #fff; }
.cta .acciones { display: flex; gap: .75rem; justify-content: center; flex-wrap: wrap; margin-top: 1.5rem; }
.cta .btn-secundario { background: transparent; color: #fff; border-color: rgba(255, 255, 255, .3); }

/* Footer */
.pie { background: #0b1c24; color: #9fb3bd; font-size: .92rem; padding: 3rem 0 2rem; }
.pie a { color: #cfe0e7; text-decoration: none; }
.pie a:hover { text-decoration: underline; }
.pie .columnas { display: grid; grid-template-columns: 1.4fr 1fr 1fr 1fr; gap: 2rem; }
@media (max-width: 760px) { .pie .columnas { grid-template-columns: minmax(0, 1fr) minmax(0, 1fr); } }
.pie a { overflow-wrap: anywhere; }
.pie h4 { color: #fff; font-size: .9rem; margin: 0 0 .75rem; }
.pie ul { list-style: none; padding: 0; margin: 0; }
.pie li { margin-bottom: .45rem; }
.pie .marca { color: #fff; margin-bottom: .75rem; }
.pie .legal { border-top: 1px solid rgba(255, 255, 255, .08); margin-top: 2.5rem; padding-top: 1.25rem; display: flex; justify-content: space-between; flex-wrap: wrap; gap: .5rem; }

/* Páginas de texto (legales, guía) */
.doc { padding: clamp(2.5rem, 6vw, 4rem) 0 5rem; }
.doc .contenedor { max-width: 780px; }
.doc h1 { font-size: clamp(1.9rem, 4vw, 2.6rem); }
.doc h2 { font-size: 1.35rem; margin-top: 2.5rem; }
.doc h3 { margin-top: 1.5rem; }
.doc .actualizado { color: var(--suave); font-size: .95rem; margin-bottom: 2rem; }
.doc ul, .doc ol { padding-left: 1.3rem; }
.doc li { margin-bottom: .45rem; }
.doc table { width: 100%; border-collapse: collapse; margin: 1rem 0 1.5rem; font-size: .95rem; }
.doc th, .doc td { text-align: left; padding: .65rem .75rem; border-bottom: 1px solid var(--linea); vertical-align: top; }
.doc th { background: var(--fondo-alt); color: var(--tinta); }
.doc .tabla-scroll { overflow-x: auto; }
.doc code { font-family: ui-monospace, SFMono-Regular, Menlo, monospace; font-size: .9em; background: var(--fondo-alt); padding: .1rem .35rem; border-radius: 5px; word-break: break-all; }
.doc .caja { background: var(--fondo-alt); border: 1px solid var(--linea); border-radius: var(--radio); padding: 1.25rem 1.4rem; margin: 1.5rem 0; }
.doc .caja p:last-child { margin: 0; }
.url-copia { display: flex; gap: .5rem; align-items: stretch; margin: .75rem 0 0; flex-wrap: wrap; }
.url-copia code { flex: 1; padding: .7rem .9rem; font-size: .9rem; background: #fff; border: 1px solid var(--linea); min-width: 0; }
.pasos { counter-reset: paso; list-style: none; padding: 0 !important; }
.pasos li { counter-increment: paso; position: relative; padding-left: 2.6rem; margin-bottom: 1rem; }
.pasos li::before { content: counter(paso); position: absolute; left: 0; top: -.05rem; width: 1.8rem; height: 1.8rem; border-radius: 50%; background: var(--tinta); color: #fff; font-weight: 700; font-size: .9rem; display: grid; place-items: center; }
mark.pendiente { background: #fff3bf; color: #7a5b00; padding: 0 .25rem; border-radius: 4px; font-weight: 600; }

@media (max-width: 480px) {
  .factura { grid-template-columns: 1fr; }
  .factura .ok, .factura .total { text-align: left; }
  .factura .ok { order: -1; }
}