* {
  box-sizing: border-box;
}

body {
  margin: 0;
  font-family: Arial, Helvetica, sans-serif;
  line-height: 1.6;
  color: #243047;
  background: #f3f6fb;
}

.contenedor {
  width: min(100% - 32px, 960px);
  margin: 0 auto;
}

.encabezado {
  padding: 64px 0;
  color: white;
  text-align: center;
  background: linear-gradient(135deg, #1d4ed8, #0f172a);
}

.encabezado h1 {
  margin: 0 0 8px;
  font-size: clamp(2rem, 5vw, 3rem);
}

.encabezado p {
  margin: 0;
  color: #dbeafe;
}

.contenido {
  padding-top: 32px;
  padding-bottom: 48px;
}

.tarjeta {
  padding: 28px;
  background: white;
  border-radius: 14px;
  box-shadow: 0 8px 24px rgba(15, 23, 42, 0.08);
}

.tarjeta h2 {
  margin-top: 0;
}

.boton {
  display: inline-block;
  margin-top: 8px;
  padding: 10px 16px;
  color: white;
  text-decoration: none;
  background: #2563eb;
  border-radius: 8px;
}

.boton:hover {
  background: #1d4ed8;
}

.detalles {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 16px;
  margin-top: 20px;
}

.detalle {
  padding: 20px;
  background: white;
  border: 1px solid #e2e8f0;
  border-radius: 12px;
}

.detalle h3 {
  margin-top: 0;
  color: #1d4ed8;
}

.pie {
  padding: 20px;
  color: #cbd5e1;
  text-align: center;
  background: #0f172a;
}

.pie p {
  margin: 0;
}

@media (max-width: 650px) {
  .detalles {
    grid-template-columns: 1fr;
  }

  .encabezado {
    padding: 48px 0;
  }
}