:root {
  --tinta: #14213d;
  --tinta-suave: #3b4863;
  --crema: #f4efe6;
  --papel: #fffdf9;
  --acento: #a8631f;
  --verde: #1d6b4f;
  --linea: #ddd5c6;
  --radio: 12px;
  --serif: Georgia, "Times New Roman", serif;
  --sans: system-ui, -apple-system, "Segoe UI", Roboto, Arial, sans-serif;
}

* { box-sizing: border-box; }
html { scroll-behavior: smooth; }
body {
  margin: 0;
  font-family: var(--sans);
  font-size: 1.0625rem;
  line-height: 1.65;
  color: var(--tinta);
  background: var(--papel);
}

h1, h2, h3 { font-family: var(--serif); line-height: 1.2; margin: 0 0 .6em; color: var(--tinta); }
h1 { font-size: clamp(2rem, 5vw, 3.2rem); letter-spacing: -.01em; }
h2 { font-size: clamp(1.6rem, 3.4vw, 2.2rem); }
h3 { font-size: 1.2rem; }
p { margin: 0 0 1em; }
a { color: inherit; }

.contenedor { width: 100%; max-width: 1080px; margin: 0 auto; padding: 0 20px; }
.angosto { max-width: 720px; }

/* Barra superior */
.barra { position: sticky; top: 0; z-index: 10; background: rgba(255, 253, 249, .94); backdrop-filter: blur(6px); border-bottom: 1px solid var(--linea); }
.barra-fila { display: flex; align-items: center; justify-content: space-between; gap: 16px; min-height: 64px; }
.marca { font-family: var(--serif); font-weight: 700; font-size: 1.15rem; text-decoration: none; }
.menu { display: flex; gap: 22px; }
.menu a { text-decoration: none; font-size: .95rem; color: var(--tinta-suave); }
.menu a:hover { color: var(--tinta); }

/* Botones */
.boton {
  display: inline-block; padding: 14px 24px; border-radius: 999px;
  background: var(--tinta); color: var(--crema); text-decoration: none;
  font-weight: 600; font-size: 1rem; border: 2px solid var(--tinta);
  transition: transform .15s ease, background .15s ease;
}
.boton:hover { transform: translateY(-1px); background: #0d1730; }
.boton-chico { padding: 9px 18px; font-size: .92rem; }
.boton-claro { background: transparent; color: var(--tinta); }
.boton-claro:hover { background: var(--crema); }
.boton-claro-sobre { background: var(--crema); color: var(--tinta); border-color: var(--crema); }
.boton-claro-sobre:hover { background: #fff; }
.boton-borde { background: transparent; color: var(--crema); border-color: var(--crema); }
.boton-borde:hover { background: rgba(244, 239, 230, .12); }
.acciones { display: flex; flex-wrap: wrap; gap: 12px; margin-top: 28px; }
.acciones.centro { justify-content: center; }

/* Portada */
.portada { padding: 72px 0 56px; background: linear-gradient(180deg, var(--crema), var(--papel)); }
.sobretitulo { font-size: .85rem; letter-spacing: .12em; text-transform: uppercase; color: var(--acento); font-weight: 700; margin-bottom: 14px; }
.entrada { font-size: 1.2rem; max-width: 640px; color: var(--tinta-suave); }

/* Franja de trayectoria */
.franja { background: var(--tinta); color: var(--crema); }
.franja-fila { display: grid; grid-template-columns: repeat(3, 1fr); gap: 20px; padding-top: 26px; padding-bottom: 26px; }
.franja strong { display: block; font-family: var(--serif); font-size: 1.25rem; }
.franja span { font-size: .92rem; opacity: .85; }

/* Secciones */
.seccion { padding: 72px 0; }
.fondo { background: var(--crema); }
.subtitulo { max-width: 680px; color: var(--tinta-suave); margin-bottom: 32px; }
.nota { margin-top: 28px; font-size: .92rem; color: var(--tinta-suave); }

.rejilla { display: grid; gap: 20px; }
.rejilla.tres { grid-template-columns: repeat(3, 1fr); }
.rejilla.dos { grid-template-columns: repeat(2, 1fr); }

.caso, .linea {
  background: var(--papel); border: 1px solid var(--linea); border-radius: var(--radio);
  padding: 24px;
}
.fondo .caso { background: var(--papel); }
.caso h3, .linea h3 { margin-bottom: .5em; }
.linea { border-top: 4px solid var(--acento); }
.caso p:last-child, .linea p:last-child { margin-bottom: 0; }

/* Pasos */
.pasos { list-style: none; counter-reset: paso; display: grid; grid-template-columns: repeat(3, 1fr); gap: 20px; padding: 0; margin: 0; }
.pasos li { counter-increment: paso; background: var(--papel); border: 1px solid var(--linea); border-radius: var(--radio); padding: 24px; }
.pasos li::before {
  content: counter(paso); display: inline-flex; align-items: center; justify-content: center;
  width: 36px; height: 36px; margin-bottom: 12px; border-radius: 50%;
  background: var(--tinta); color: var(--crema); font-family: var(--serif); font-weight: 700;
}
.pasos p:last-child { margin-bottom: 0; }

/* Preguntas */
details { border-bottom: 1px solid var(--linea); padding: 4px 0; }
summary { cursor: pointer; padding: 16px 28px 16px 0; font-weight: 600; list-style: none; position: relative; }
summary::-webkit-details-marker { display: none; }
summary::after { content: "+"; position: absolute; right: 4px; top: 12px; font-size: 1.5rem; font-weight: 400; color: var(--acento); }
details[open] summary::after { content: "\2212"; }
details p { color: var(--tinta-suave); }
details p:last-child { margin-bottom: 18px; }

/* Cierre */
.cierre { background: var(--tinta); color: var(--crema); padding: 72px 0; text-align: center; }
.cierre h2 { color: var(--crema); }

/* Pie */
.pie { padding: 32px 0 96px; font-size: .95rem; color: var(--tinta-suave); }
.pie p { margin-bottom: .4em; }
.pie-chico { font-size: .85rem; }

/* WhatsApp flotante (celular) */
.flotante {
  display: none; position: fixed; right: 16px; bottom: 16px; z-index: 20;
  background: var(--verde); color: #fff; text-decoration: none; font-weight: 700;
  padding: 14px 22px; border-radius: 999px; box-shadow: 0 6px 18px rgba(0, 0, 0, .25);
}

:focus-visible { outline: 3px solid var(--acento); outline-offset: 3px; }

@media (max-width: 860px) {
  .menu { display: none; }
  .rejilla.tres, .rejilla.dos, .pasos, .franja-fila { grid-template-columns: 1fr; }
  .franja-fila { gap: 14px; }
  .portada { padding: 48px 0 40px; }
  .seccion, .cierre { padding: 52px 0; }
  .flotante { display: inline-block; }
  .barra-fila { min-height: 58px; }
}

@media (prefers-reduced-motion: reduce) {
  html { scroll-behavior: auto; }
  .boton { transition: none; }
}