.header {
  position: fixed;
  top: 0;
  left: 0;
  right: 0;
  z-index: var(--z-fixed);
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: var(--espaciado-md);
  padding: var(--espaciado-md) var(--espaciado-lg);
  background-color: rgba(236, 231, 231, 0.859);
  border-bottom: 0.0625rem solid var(--borde-color);
  box-shadow: var(--sombra-md);
  backdrop-filter: blur(0.625rem);
  -webkit-backdrop-filter: blur(0.625rem);
  transition: var(--transicion-normal);
}

body.dark .header {
  background-color: rgba(15, 23, 42, 0.95);
  border-bottom-color: var(--borde-color);
}

.hd-p-logo {
  font-size: var(--texto-xl);
  font-weight: var(--peso-bold);
  color: var(--color-primario);
  margin: 0;
  white-space: nowrap;
  transition: var(--transicion-normal);
  cursor: pointer;
}

.hd-p-logo:hover {
  color: var(--color-enlace-hover);
  transform: scale(1.05);
}

.hd-bn-modos,
.hd-bn-hamburguesa {
  background: none;
  border: none;
  cursor: pointer;
  width: 2.5rem;
  height: 2.5rem;
  display: flex;
  align-items: center;
  justify-content: center;
  color: var(--texto-primario);
  border-radius: var(--radio-md);
  transition: var(--transicion-normal);
  position: relative;
}

.hd-bn-modos:hover,
.hd-bn-hamburguesa:hover {
  background-color: var(--bg-terciario);
  transform: scale(1.1);
}

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

.hd-bn-modos:focus,
.hd-bn-hamburguesa:focus {
  outline: 0.125rem solid var(--color-primario);
  outline-offset: 0.125rem;
}

.hd-bn-modos i,
.hd-bn-hamburguesa i {
  font-size: 1.5rem;
  transition: var(--transicion-rapida);
}

.hd-bn-modos {
  order: -1;
}

.hd-bn-modos-sun,
.hd-bn-modos-moon {
  position: absolute;
  transition: opacity var(--transicion-normal), transform var(--transicion-normal);
}

body:not(.dark) .hd-bn-modos-sun {
  opacity: 1;
  transform: rotate(0deg);
}

body:not(.dark) .hd-bn-modos-moon {
  opacity: 0;
  transform: rotate(180deg);
}

body.dark .hd-bn-modos-sun {
  opacity: 0;
  transform: rotate(-180deg);
}

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

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

.hd-bn-hamburguesa i {
  position: absolute;
  transition: opacity var(--transicion-rapida), transform 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: 3.5rem;
  left: 0;
  right: 0;
  background-color: rgba(255, 255, 255, 0.98);
  border-bottom: 0.0625rem solid var(--borde-color);
  box-shadow: var(--sombra-lg);
  backdrop-filter: blur(0.625rem);
  -webkit-backdrop-filter: blur(0.625rem);
  max-height: 0;
  overflow: hidden;
  opacity: 0;
  transition: max-height var(--transicion-normal), 
              opacity var(--transicion-normal),
              transform var(--transicion-normal);
  transform: translateY(-0.625rem);
  z-index: calc(var(--z-fixed) - 1);
}

body.dark .hd-nav {
  background-color: rgba(15, 23, 42, 0.98);
}

.hd-nav.nav-abierto {
  max-height: 31.25rem;
  opacity: 1;
  transform: translateY(0);
}

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

.hd-nav-ul-li {
  position: relative;
}

.hd-nav-ul-li-a {
  display: block;
  padding: var(--espaciado-md);
  color: var(--texto-primario);
  text-decoration: none;
  font-weight: var(--peso-medio);
  font-size: var(--texto-base);
  border-radius: var(--radio-md);
  transition: var(--transicion-normal);
  position: relative;
  overflow: hidden;
}

.hd-nav-ul-li-a::before {
  content: '';
  position: absolute;
  left: 0;
  top: 0;
  height: 100%;
  width: 0.25rem;
  background-color: var(--color-primario);
  transform: scaleY(0);
  transition: var(--transicion-normal);
}

.hd-nav-ul-li-a:hover {
  background-color: var(--bg-terciario);
  color: var(--color-primario);
}

.hd-nav-ul-li-a:hover::before {
  transform: scaleY(1);
}

.hd-nav-ul-li-a:focus {
  outline: 0.125rem solid var(--color-primario);
  outline-offset: 0.125rem;
}

.submenu {
  list-style: none;
  padding: 0;
  margin: 0;
  max-height: 0;
  overflow: hidden;
  opacity: 0;
  transition: max-height var(--transicion-normal),
              opacity var(--transicion-normal),
              margin var(--transicion-normal);
}

.submenu.submenu-abierto {
  max-height: 18.75rem;
  opacity: 1;
  margin-top: var(--espaciado-sm);
}

.submenu li {
  padding-left: var(--espaciado-lg);
}

.submenu a {
  display: block;
  padding: var(--espaciado-sm) var(--espaciado-md);
  color: var(--texto-secundario);
  text-decoration: none;
  font-size: var(--texto-sm);
  font-weight: var(--peso-normal);
  border-radius: var(--radio-md);
  border-left: 0.125rem solid transparent;
  transition: var(--transicion-rapida);
}

.submenu a:hover {
  color: var(--color-primario);
  background-color: var(--bg-terciario);
  border-left-color: var(--color-primario);
  padding-left: var(--espaciado-lg);
}

[id] {
  scroll-margin-top: 2rem;
}

@media (min-width: 48rem) {
  .header {
    padding: var(--espaciado-lg) var(--espaciado-xl);
  }
  
  .hd-p-logo {
    font-size: var(--texto-2xl);
  }
  
  .hd-bn-hamburguesa {
    display: none;
  }
  
  .hd-nav {
    position: static;
    max-height: none;
    opacity: 1;
    transform: translateY(0);
    background: transparent;
    border: none;
    box-shadow: none;
    backdrop-filter: none;
    overflow: visible;
  }
  
  .hd-nav-ul {
    flex-direction: row;
    padding: 0;
    gap: var(--espaciado-sm);
    align-items: center;
  }
  
  .hd-nav-ul-li {
    position: relative;
  }
  
  .hd-nav-ul-li-a {
    padding: var(--espaciado-sm) var(--espaciado-md);
    white-space: nowrap;
  }
  
  
  .hd-nav-ul-li-a::before {
    width: 100%;
    height: 0.125rem;
    top: auto;
    bottom: 0;
    transform: scaleX(0);
  }
  
  
  .hd-nav-ul-li:hover .submenu,
  .hd-nav-ul-li:focus-within .submenu {
    max-height: 18.75rem;
    opacity: 1;
    margin-top: var(--espaciado-sm);
  }
  
  .submenu {
    position: absolute;
    top: 100%;
    left: 0;
    min-width: 12.5rem;
    background-color: rgba(255, 255, 255, 0.98);
    border: 0.0625rem solid var(--borde-color);
    border-radius: var(--radio-md);
    box-shadow: var(--sombra-lg);
    margin-top: 0;
    padding: var(--espaciado-sm);
    backdrop-filter: blur(0.625rem);
    -webkit-backdrop-filter: blur(0.625rem);
    z-index: calc(var(--z-fixed) + 10);
  }
  
  body.dark .submenu {
    background-color: rgba(30, 41, 59, 0.98);
  }
  
  .submenu li {
    padding-left: 0;
  }
  
  .submenu a {
    border-left: none;
    padding-left: var(--espaciado-md);
  }
  
  .submenu a:hover {
    padding-left: var(--espaciado-lg);
  }
  
  [id] {
    scroll-margin-top: 2rem;
  }
}

@media (min-width: 64rem) {
  .header {
    padding: var(--espaciado-lg) var(--espaciado-2xl);
  }
  
  .hd-p-logo {
    font-size: var(--texto-3xl);
  }
  
  .hd-nav-ul {
    gap: var(--espaciado-md);
  }
  
  .hd-nav-ul-li-a {
    padding: var(--espaciado-md) var(--espaciado-lg);
    font-size: var(--texto-lg);
  }
  
  .submenu {
    min-width: 15rem;
  }
  
  [id] {
    scroll-margin-top: 4rem;
  }
}

@media (min-width: 90rem) {
  .header {
    padding: var(--espaciado-xl) var(--espaciado-2xl);
  }
  
  .hd-nav-ul {
    gap: var(--espaciado-lg);
  }
  
  .hd-nav-ul-li-a {
    padding: var(--espaciado-md) var(--espaciado-xl);
  }
}

@media (prefers-reduced-motion: reduce) {
  .header,
  .hd-nav,
  .hd-nav-ul-li-a,
  .submenu,
  .hd-bn-modos i,
  .hd-bn-hamburguesa i {
    transition: none;
    animation: none;
  }
}

@media (prefers-contrast: high) {
  .header {
    border-bottom-width: 0.125rem;
  }
  
  .hd-nav-ul-li-a:hover {
    outline: 0.125rem solid currentColor;
  }
}