body {
  font-family: Arial, sans-serif;
  margin: 0;
}

.contenedor {
  max-width: 900px;
  margin: 24px auto;
  padding: 0 16px;
}

.nav {
  display: flex;
  justify-content: space-between;
  align-items: center;
  padding: 12px 16px;
  background: #f2f2f2;
  border-bottom: 1px solid #ddd;
}

.nav__izquierda,
.nav__derecha {
  display: flex;
  gap: 12px;
  align-items: center;
}

.nav__link {
  text-decoration: none;
  color: #222;
  padding: 6px 10px;
  border-radius: 6px;
}

.nav__link:hover {
  background: #e6e6e6;
}

.nav__usuario {
  font-size: 14px;
  color: #444;
}

.tarjeta {
  background: #ffffff;
  border: 1px solid #e2e2e2;
  border-radius: 14px;
  padding: 20px 22px;
  box-shadow: 0 6px 14px rgba(0,0,0,0.08);
}

.formulario-contenedor {
  max-width: 420px;
  margin: 32px auto;
}

.formulario-contenedor h1 {
  text-align: center;
  margin-bottom: 16px;
}

.campo {
  display: flex;
  flex-direction: column;
  gap: 6px;
  margin-bottom: 12px;
}

input {
  padding: 10px;
  border: 1px solid #bbb;
  border-radius: 8px;
}

button {
  padding: 10px 14px;
  border: 0;
  border-radius: 8px;
  cursor: pointer;
}

.alerta {
  padding: 10px;
  border-radius: 8px;
  margin: 12px 0;
}

.alerta--error {
  border: 1px solid #c77;
  background: #ffecec;
}

.alerta--ok {
  border: 1px solid #7c7;
  background: #ecffec;
}

.nota {
  font-size: 13px;
  color: #555;
  margin-top: 10px;
}

/* Portada */
.portada {
  max-width: 820px;
  margin: 24px auto;
}

.portada__imagen {
  width: 100%;
  max-height: 320px;
  object-fit: cover;
  border-radius: 12px;
  display: block;
  margin-bottom: 16px;
}

.portada__texto {
  font-size: 15.5px;
  line-height: 1.7;
  color: #222;
  text-align: justify;
}

h1 {
  text-align: center;
  font-size: 26px;
  font-weight: 600;
  margin: 20px 0 12px;
}

@media (max-width: 768px) {
  .portada {
    max-width: 94%;
  }

  .portada__imagen {
    max-height: 220px;
  }

  .portada-contenedor {
  max-width: 820px;
  margin: 0 auto;
}

}