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

body {
background: linear-gradient(to bottom, #a1deed 0%, #349ae9 100%);
 background: linear-gradient(to bottom, #b3e5fc 0%, #81d4fa 40%, #4fc3f7 100%);
 
}

main {
  margin: 0;

}

.form-nav {
  display: flex;
  gap: 10px;
  align-items: center;
  justify-content: center;
  padding: 10px 0;
}

.input-numero,
.select-opcion,
.btn-enviar {
  font-size: 14px;
  padding: 4px 8px;
  border-radius: 6px;
  border: 1px solid #109955;
}

.btn-enviar:hover {
  background-color: #b30000;
}
.input-numero,
.select-opcion {
  width: 50px;
}

#navFormDesktop {
  display: flex;
  justify-content: flex-end;
  padding-left: 10px;
}
.navbar-nav {
  display: flex;
  flex-direction: row;
  justify-content: center;
  align-items: center;
  margin-left: 5%;
  margin-right: 5%;
}
.logo-marca {
  height: 40px;
  margin-right: 10px;
  padding-bottom: 0%;
}
.navbar .nav-link {
  border-radius: 0.375rem;
  padding: 0.25rem 0.75rem;

  transition: background-color 0.2s ease-in-out;
}

.navbar .nav-link:hover {
  background-color: rgba(255, 255, 255, 0.2);
  text-decoration: none;
}

.glass {
  display: flex;
  justify-content: center;
  align-items: center;
  border-radius: 10px;
  box-shadow: 0 2px 2px;
background-color: #ffee6eb1;

}
.img-bienvenida {
  width: 50%;
  margin: 0 auto;
}

h1 {
  height: auto;
  color: rgb(51, 51, 61) !important; 
  font-size: 30px !important;
  font-family: Arial, Helvetica, sans-serif;
  text-shadow: rgb(50, 50, 55) 1px 1px 2px;
  text-align: center;
}
.lead {
  margin-bottom: 1.5rem;
  text-shadow: rgb(190, 178, 178) 1px 1px 2px;
}

html {
  scroll-behavior: smooth;
}
.accordion-item {
   transition: max-height 0.3s ease-in-out;
  border-radius: 8px;
  overflow: hidden;
  margin-bottom: 1rem;
  box-shadow: 8px 52px 8px rgba(0, 0, 0, 0.05);
}

.accordion-button {
  font-weight: bold;
}

.accordion-body {
  padding: 1.2rem;
}

/* Colores por sección */
#collapseNaturales .accordion-body {
  background-color: #e6f7ff;
}
#collapseEnteros .accordion-body {
  background-color: #fff3cd;
}
#collapseRacionales .accordion-body {
  background-color: #e2f0d9;
}
#collapseIrracionales .accordion-body {
  background-color: #f8d7da;
}
#collapseReales .accordion-body {
  background-color: #f0f0f0;
}
#collapseDivisores .accordion-body {
  background-color: #d1ecf1;
}
#collapseMultiplos .accordion-body {
  background-color: #fefefe;
}
#collapsePrimos .accordion-body {
  background-color: #ffeeba;
}
#collapseCoprimos .accordion-body {
  background-color: #f5f5dc;
}

footer {
  display: flex;
  justify-content: center;
  align-items: center;
}

.seccion-sobre {
  background-color: rgba(255, 255, 255, 0.8);
  margin: 0;
  padding: 20px;
  border-radius: 10px;
  box-shadow: 0 4px 20px rgba(0, 0, 0, 0.1);
  margin-top: 40px;
}

#btnVolverArriba {
  display: none;
  width: 60px;
  height: 60px;
  z-index: 1050;
  opacity: 0.85;
  transition: opacity 0.3s ease;
}
#btnVolverArriba:hover {
  opacity: 1;
}

.contacto{
  font-size: 20px;
}
.btnLimpiar:hover{
  background-color: #ab1616;
}
.sr-only {
  position: absolute;
  width: 1px;
  height: 1px;
  padding: 0;
  overflow: hidden;
  clip: rect(0, 0, 0, 0);
  white-space: nowrap;
  border: 0;
}

@media (max-width: 768px) {
  .img-bienvenida {
    width: 80%;
  }
  h1 {
    font-size: 18px !important;
  }

  main{
    font-size: 18px;
  }

  .glass {
    border-radius: 0%;
    box-shadow: 0px;
    padding: 0% !important;
  }
}