*{
  margin: 0;
  padding: 0;
  box-sizing: border-box;
}
body {
  display: flex;
  flex-direction: column;
  min-height: 100vh;
  font-family: Arial, Helvetica, sans-serif;
  padding: 30px;
    background-image: url(../assets/fondo.2.avif); 
    background-size: cover;
    background-repeat: no-repeat;
    background-position: center;
    background-repeat: no-repeat;
    width: 100%;
background-attachment: fixed;
    position: relative;
}
   main{
    flex: 1;
   }
   
h1 { 
    color: rgb(0, 0, 0);
    font-size: 300%;
    font-family: Arial, Helvetica, sans-serif;
  text-align: center;
  
}
h2{
    text-align: center;
}
.navbar {
  display: flex;
  justify-content: space-between;
  align-items: center;
  padding: 1rem 2rem;
  background-color: #333;
  color: white;
}

.logo {
  font-size: 1.5rem;
  font-weight: bold;
}

.nav-links {
  display: flex;
  gap: 2rem;
  list-style: none;
  margin: 0;
  padding: 0;
}

.nav-links a {
  color: white;
  text-decoration: none;
}

.login {
  padding: 0.5rem 1rem;
  background-color: white;
  color: #333;
  border: none;
  border-radius: 4px;
  cursor: pointer;
}
p{
    text-align: center;
}
.titulo{
  grid-column: 2;
  display: flex;
  flex-direction: column;
  align-items: center;
  justify-content: center;
  text-align: center;
  width: fit-content;
  margin: 0 auto;
  padding: 1rem 1.5rem;
  border-radius: 12px;
  background: rgba(23, 59, 74, 0.82);
  color: #fff;
}

.titulo h1,
.titulo h2 {
  color: #fff;
}

#paleta {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(min(100%, 140px), 1fr));
  gap: 16px;
  margin: 2rem;
  border-radius: 18px;
}

.tarjeta-color {
  width: 100%;
  overflow: hidden;
  border-radius: 8px;
  background-color: rgb(203, 244, 248);
  box-shadow: 0 2px 8px rgb(0 0 0 / 15%);
  transition: transform 0.2s ease, box-shadow 0.2s ease;
}

.tarjeta-color:hover,
.tarjeta-color:focus-within {
  transform: translateY(-8px);
  box-shadow: 0 10px 20px rgb(0 0 0 / 25%);
}

@media (prefers-reduced-motion: reduce) {
  .tarjeta-color {
    transition: none;
  }

  .tarjeta-color:hover,
  .tarjeta-color:focus-within {
    transform: none;
  }
}

.muestra-color {
  min-height: 140px;
  
}

.codigo-color {
  min-height: 3.5rem;
  padding: 0.75rem;
  font-family: monospace;
  font-weight: bold;
  overflow-wrap: anywhere;
}

.boton-bloqueo {
  display: block;
  margin: 0 auto 12px;
  padding: 8px 12px;
  background-color: #fff;
  color: #111827;
  cursor: pointer;
}

.boton-bloqueo[aria-pressed="true"] {
  background-color: #173b4a;
  color: #fff;
}

footer {
  padding: 10px 30px;
  background: rgb(203, 244, 248);
}

.controls {
    display: flex;
    justify-content: center;
    align-items: end;
    gap: 20px;
    flex-wrap: wrap;
    margin-bottom: 32px;
    padding: 22px 18px;
    background: rgba(195, 245, 248, 0.616);
    border: 1px solid rgba(148, 163, 184, 0.25);
    border-radius: 18px;
    box-shadow: 0 10px 24px rgba(15, 23, 42, 0.08);
    backdrop-filter: blur(6px);
}

.paletas {
    display: grid;
    grid-template-columns: repeat(3, minmax(180px, 1fr));
    align-items: end;
    gap: 12px 20px;
}

.field {
    display: flex;
    flex-direction: column;
    gap: 10px;
    min-width: 180px;
}

.paletas > button {
    grid-column: 3;
    grid-row: 1;
}

#boton-generar {
    position: relative;
}

#boton-generar::after {
    content: attr(data-tooltip);
    position: absolute;
    z-index: 2;
    left: 50%;
    bottom: calc(100% + 10px);
    width: max-content;
    max-width: 260px;
    padding: 8px 10px;
    border-radius: 6px;
    background: #173b4a;
    color: #fff;
    font-size: 0.85rem;
    font-weight: 400;
    line-height: 1.3;
    text-align: center;
    white-space: normal;
    opacity: 0;
    visibility: hidden;
    transform: translate(-50%, 4px);
    transition: opacity 0.2s ease, transform 0.2s ease, visibility 0.2s;
    pointer-events: none;
}

#boton-generar:hover::after,
#boton-generar:focus-visible::after {
    opacity: 1;
    visibility: visible;
    transform: translate(-50%, 0);
}


label {
    font-weight: 700;
    color: #111827;
    font-size: 0.95rem;
}

select,
button {
    padding: 12px 16px;
    border-radius: 12px;
    border: 1px solid #dbe3f0;
    font-size: 0.96rem;
    transition: all 0.2s ease;
}
:focus-visible {
  outline: 3px solid #000000;
  outline-offset: 3px;
}

@media (max-width: 640px) {
  body {
    padding: 16px;
  }

  .controls {
    padding: 18px 14px;
  }

  .paletas {
    grid-template-columns: minmax(0, 1fr);
    width: 100%;
  }

  .field {
    min-width: 0;
  }

  .paletas > button {
    grid-column: auto;
    grid-row: auto;
  }

  #paleta {
    margin: 1rem 0;
  }

  footer {
    padding: 10px 16px;
    overflow-wrap: anywhere;
  }
}