.header {
  position: fixed;
  top: 0;
  left: 0;
  right: 0;
  height: var(--altura-header);
  background-color: var(--color-fondo-header);
  backdrop-filter: blur(10px);
  border-bottom: 1px solid var(--color-borde);
  box-shadow: 0 2px 8px var(--color-sombra);
  z-index: var(--z-header);
  padding: 0 var(--espacio-xs);
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: var(--espacio-sm);
  transition: all var(--transicion-normal);
}

.hd-p-logo {
  font-size: var(--tamaño-texto-sm);
  font-weight: var(--peso-bold);
  color: var(--color-texto-principal);
  white-space: nowrap;
  overflow: hidden;
  text-overflow: ellipsis;
  flex: 1;
  max-width: 10rem;
}

.hd-bn-modos,
.hd-bn-hamburguesa {
  width: 2.5rem;
  height: 2.5rem;
  border: none;
  border-radius: var(--radio-lg);
  background-color: transparent;
  color: var(--color-texto-principal);
  cursor: pointer;
  display: flex;
  align-items: center;
  justify-content: center;
  font-size: var(--tamaño-texto-lg);
  transition: all var(--transicion-rapida);
  flex-shrink: 0;
  position: relative;
}

.hd-bn-modos:hover,
.hd-bn-hamburguesa:hover {
  background-color: var(--color-borde);
  transform: scale(1.05);
}

.hd-bn-modos:active,
.hd-bn-hamburguesa:active {
  transform: scale(0.95);
}

.hd-bn-modos i {
  position: absolute;
  transition: all var(--transicion-normal);
}

.hd-bn-modos-sun {
  opacity: 1;
  transform: rotate(0deg) scale(1);
}

.hd-bn-modos-moon {
  opacity: 0;
  transform: rotate(90deg) scale(0);
}

body.dark .hd-bn-modos-sun {
  opacity: 0;
  transform: rotate(-90deg) scale(0);
}

body.dark .hd-bn-modos-moon {
  opacity: 1;
  transform: rotate(0deg) scale(1);
}

.hd-bn-hamburguesa {
  display: flex;
}

.hd-bn-hamburguesa i {
  position: absolute;
  transition: all var(--transicion-rapida);
}

.hd-bn-hamburguesa .bi-list {
  opacity: 1;
  transform: rotate(0deg);
}

.hd-bn-hamburguesa .bi-x-lg {
  opacity: 0;
  transform: rotate(90deg);
}

.hd-bn-hamburguesa.activo .bi-list {
  opacity: 0;
  transform: rotate(-90deg);
}

.hd-bn-hamburguesa.activo .bi-x-lg {
  opacity: 1;
  transform: rotate(0deg);
}

.hd-nav {
  position: fixed;
  top: var(--altura-header);
  left: 0;
  right: 0;
  background-color: var(--color-fondo-header);
  backdrop-filter: blur(10px);
  border-bottom: 1px solid var(--color-borde);
  box-shadow: 0 4px 12px var(--color-sombra);
  max-height: 0;
  overflow: hidden;
  opacity: 0;
  transition: all var(--transicion-normal);
}

.hd-nav.nav-abierto {
  max-height: 20rem;
  opacity: 1;
  padding: var(--espacio-md) 0;
}

.hd-nav-ul {
  display: flex;
  flex-direction: column;
  list-style: none;
  width: 100%;
  gap: 0;
  margin: 0;
  padding: 0 var(--espacio-md);
}

.hd-nav-ul-li {
  margin: 0;
}

.hd-nav-ul-li-a {
  display: block;
  padding: var(--espacio-md) var(--espacio-lg);
  color: var(--color-texto-secundario);
  text-decoration: none;
  font-weight: var(--peso-medio);
  font-size: var(--tamaño-texto-base);
  border-radius: var(--radio-lg);
  white-space: nowrap;
  transition: all var(--transicion-rapida);
  position: relative;
}

.hd-nav-ul-li-a:hover {
  color: var(--color-acento);
  background-color: var(--color-borde);
  transform: translateX(0.5rem);
}

@media (min-width: 481px) {
  :root {
    --altura-header: 4rem;
  }

  .header {
    padding: 0 var(--espacio-sm);
  }

  .hd-p-logo {
    font-size: var(--tamaño-texto-base);
    max-width: 12rem;
  }

  .hd-bn-modos,
  .hd-bn-hamburguesa {
    width: 2.75rem;
    height: 2.75rem;
    font-size: var(--tamaño-texto-xl);
  }

  .hd-nav-ul-li-a {
    font-size: var(--tamaño-texto-lg);
  }
}

@media (min-width: 769px) {
  .header {
    padding: 0 var(--espacio-md);
  }

  .hd-p-logo {
    font-size: var(--tamaño-texto-lg);
    max-width: 15rem;
  }

  .hd-bn-hamburguesa {
    display: none;
  }

  .hd-nav {
    position: static;
    max-height: none;
    opacity: 1;
    background-color: transparent;
    backdrop-filter: none;
    border: none;
    box-shadow: none;
    padding: 0;
    display: flex;
    align-items: center;
  }

  .hd-nav-ul {
    flex-direction: row;
    gap: var(--espacio-sm);
    padding: 0;
    width: auto;
  }

  .hd-nav-ul-li-a {
    padding: var(--espacio-sm) var(--espacio-md);
    font-size: var(--tamaño-texto-base);
  }

  .hd-nav-ul-li-a:hover {
    transform: translateY(-2px);
  }

  .hd-nav-ul-li-a::after {
    content: '';
    position: absolute;
    bottom: 0.25rem;
    left: 50%;
    transform: translateX(-50%) scaleX(0);
    width: 80%;
    height: 2px;
    background-color: var(--color-acento);
    border-radius: 2px;
    transition: transform var(--transicion-rapida);
  }

  .hd-nav-ul-li-a:hover::after {
    transform: translateX(-50%) scaleX(1);
  }
}

@media (min-width: 1024px) {
  .header {
    padding: 0 var(--espacio-xl);
  }

  .hd-p-logo {
    font-size: var(--tamaño-texto-xl);
    max-width: 20rem;
  }

  .hd-nav-ul {
    gap: var(--espacio-md);
  }

  .hd-nav-ul-li-a {
    padding: var(--espacio-md) var(--espacio-lg);
    font-size: var(--tamaño-texto-lg);
  }
}

@media (min-width: 1440px) {
  .header {
    padding: 0 var(--espacio-2xl);
  }

  .hd-nav-ul {
    gap: var(--espacio-lg);
  }
}

@media (prefers-reduced-motion: reduce) {
  * {
    animation-duration: 0.01ms !important;
    animation-iteration-count: 1 !important;
    transition-duration: 0.01ms !important;
  }
}

.hd-bn-modos:focus-visible,
.hd-bn-hamburguesa:focus-visible,
.hd-nav-ul-li-a:focus-visible {
  outline: 2px solid var(--color-acento);
  outline-offset: 2px;
}