.site-header {
    position: sticky;
    top: 0;
    z-index: 100;
    min-height: var(--header-height);
    border-bottom: 1px solid var(--color-border);
    background: var(--color-header-bg);
    backdrop-filter: blur(20px);
    -webkit-backdrop-filter: blur(20px);
    box-shadow: var(--shadow-header);
    transition:
        background-color var(--transition-theme),
        border-color var(--transition-theme),
        box-shadow var(--transition-theme);
}

.site-header.is-scrolled {
    box-shadow: var(--shadow-soft);
}

.header-container {
    width: min(100%, var(--container-width));
    min-height: var(--header-height);
    margin-inline: auto;
    padding-inline: var(--container-padding);
    display: grid;
    grid-template-columns: 1fr auto auto;
    align-items: center;
    gap: 0.9rem;
}

/* Logo */

.site-logo {
    width: fit-content;
    display: inline-flex;
    align-items: center;
    letter-spacing: -0.035em;
}

.site-logo__name {
    font-size: clamp(1rem, 2vw, 1.18rem);
    font-weight: 650;
    line-height: 1;
}

/* Navegación móvil */

.primary-nav {
    position: fixed;
    inset: var(--header-height) 0 auto 0;
    padding: 1rem var(--container-padding) 1.25rem;
    border-bottom: 1px solid var(--color-border);
    background: var(--color-header-bg);
    backdrop-filter: blur(20px);
    -webkit-backdrop-filter: blur(20px);
    opacity: 0;
    pointer-events: none;
    transform: translateY(-0.75rem);
    transition:
        opacity var(--transition-base),
        transform var(--transition-base),
        background-color var(--transition-theme),
        border-color var(--transition-theme);
}

.primary-nav.is-open {
    opacity: 1;
    pointer-events: auto;
    transform: translateY(0);
}

.primary-nav__list {
    display: grid;
    gap: 0.25rem;
}

.primary-nav__link {
    position: relative;
    display: block;
    width: fit-content;
    padding: 0.85rem 0;
    color: var(--color-text-muted);
    font-size: 0.96rem;
    transition:
        color var(--transition-fast),
        transform var(--transition-fast);
}

/* Elimina cualquier bolita vieja del hover anterior */

.primary-nav__link::before {
    content: none;
    display: none;
}

/* Subrayado minimalista: usa el mismo color del texto */

.primary-nav__link::after {
    content: "";
    position: absolute;
    left: 0;
    bottom: 0.55rem;
    width: 100%;
    height: 1px;
    background: currentColor;
    transform: scaleX(0);
    transform-origin: left;
    opacity: 0;
    transition:
        transform var(--transition-base),
        opacity var(--transition-base),
        background-color var(--transition-theme);
}

.primary-nav__link:hover,
.primary-nav__link:focus-visible {
    color: var(--color-text);
    transform: translateX(0.2rem);
}

.primary-nav__link:hover::after,
.primary-nav__link:focus-visible::after {
    opacity: 1;
    transform: scaleX(1);
}

/* Por si quedó algún span viejo tipo active-nav en el HTML anterior */

.primary-nav .active-nav {
    display: none;
}

/* Controles */

.header-actions {
    display: inline-flex;
    align-items: center;
    gap: 0.45rem;
}

.language-toggle,
.theme-toggle,
.menu-toggle {
    display: inline-flex;
    align-items: center;
    justify-content: center;
    border: 1px solid var(--color-border);
    color: var(--color-text);
    background: rgba(255, 255, 255, 0.02);
    transition:
        color var(--transition-theme),
        border-color var(--transition-theme),
        background-color var(--transition-theme),
        box-shadow var(--transition-theme),
        transform var(--transition-fast);
}

.language-toggle:hover,
.theme-toggle:hover,
.menu-toggle:hover,
.language-toggle:focus-within,
.theme-toggle:focus-visible,
.menu-toggle:focus-visible {
    border-color: var(--color-border-strong);
    background: var(--color-accent-soft);
    box-shadow: 0 0 24px var(--color-accent-soft);
}

.theme-toggle:active,
.menu-toggle:active {
    transform: scale(0.97);
}

/* Selector de idioma */

.language-toggle {
    position: relative;
    min-height: 2.25rem;
    padding: 0 0.72rem;
    border-radius: var(--radius-full);
    gap: 0.28rem;
    cursor: pointer;
}

.language-toggle__button {
    position: relative;
    z-index: 1;
    padding: 0;
    border: 0;
    color: var(--color-text-muted);
    background: transparent;
    font-size: 0.76rem;
    font-weight: 650;
    line-height: 1;
    letter-spacing: 0.08em;
    opacity: 0.46;
    cursor: pointer;
    transition:
        color var(--transition-theme),
        opacity var(--transition-theme),
        transform var(--transition-fast);
}

.language-toggle__button:hover,
.language-toggle__button:focus-visible {
    color: var(--color-text);
    opacity: 0.86;
}

.language-toggle__button:focus-visible {
    outline: none;
}

.language-toggle__button.is-active {
    color: var(--color-text);
    opacity: 1;
}

.language-toggle__button:active {
    transform: scale(0.94);
}

.language-toggle__separator {
    color: var(--color-text-muted);
    font-size: 0.74rem;
    line-height: 1;
    opacity: 0.32;
    transform: translateY(-0.02rem);
    pointer-events: none;
    transition:
        color var(--transition-theme),
        opacity var(--transition-theme);
}

/* Botón de tema */

.theme-toggle {
    position: relative;
    width: 2.25rem;
    height: 2.25rem;
    border-radius: 50%;
    overflow: hidden;
}

.theme-toggle__icon {
    position: absolute;
    width: 0.95rem;
    height: 0.95rem;
    border-radius: 50%;
    transition:
        opacity var(--transition-theme-icon),
        transform var(--transition-theme-icon),
        box-shadow var(--transition-theme-icon),
        background-color var(--transition-theme-icon),
        border-color var(--transition-theme-icon);
}

/* Modo claro: el sol está visible */

.theme-toggle__icon--sun {
    background: var(--color-accent);
    box-shadow:
        0 0 0 4px var(--color-accent-soft),
        0 0 20px var(--color-accent-soft);
    opacity: 1;
    transform: translateY(0) rotate(0deg);
}

/* Modo claro: la luna está arriba, lista para caer */

.theme-toggle__icon--moon {
    border: 1px solid var(--color-sky);
    box-shadow: inset -0.24rem 0 0 var(--color-sky);
    opacity: 0;
    transform: translateY(-1rem) rotate(-35deg);
}

/* Modo oscuro: el sol baja y desaparece */

html[data-theme="dark"] .theme-toggle__icon--sun {
    opacity: 0;
    transform: translateY(1rem) rotate(35deg);
}

/* Modo oscuro: cae la noche */

html[data-theme="dark"] .theme-toggle__icon--moon {
    opacity: 1;
    transform: translateY(0) rotate(0deg);
}

/* Modo claro: sale el sol */

html[data-theme="light"] .theme-toggle__icon--sun {
    opacity: 1;
    transform: translateY(0) rotate(0deg);
}

/* Modo claro: la luna sube y desaparece */

html[data-theme="light"] .theme-toggle__icon--moon {
    opacity: 0;
    transform: translateY(-1rem) rotate(-35deg);
}

/* Botón hamburguesa */

.menu-toggle {
    width: 2.25rem;
    height: 2.25rem;
    border-radius: var(--radius-full);
    flex-direction: column;
    gap: 0.32rem;
}

.menu-toggle__line {
    width: 1rem;
    height: 1px;
    background: currentColor;
    transform-origin: center;
    transition:
        transform var(--transition-base),
        opacity var(--transition-base),
        background-color var(--transition-theme);
}

.menu-toggle.is-open .menu-toggle__line:first-child {
    transform: translateY(0.16rem) rotate(42deg);
}

.menu-toggle.is-open .menu-toggle__line:last-child {
    transform: translateY(-0.16rem) rotate(-42deg);
}

/* Desktop */

@media (min-width: 860px) {
    .header-container {
        grid-template-columns: auto 1fr auto;
        gap: 2rem;
    }

    .menu-toggle {
        display: none;
    }

    .primary-nav {
        position: static;
        inset: auto;
        padding: 0;
        border-bottom: 0;
        background: transparent;
        backdrop-filter: none;
        -webkit-backdrop-filter: none;
        opacity: 1;
        pointer-events: auto;
        transform: none;
    }

    .primary-nav__list {
        display: flex;
        align-items: center;
        justify-content: center;
        gap: clamp(0.4rem, 1.4vw, 1.15rem);
    }

    .primary-nav__link {
        padding: 0.55rem 0.3rem;
        font-size: 0.9rem;
    }

    .primary-nav__link::after {
        bottom: 0.25rem;
    }

    .primary-nav__link:hover,
    .primary-nav__link:focus-visible {
        transform: translateY(-1px);
    }
}

/* Ajustes móviles pequeños */

@media (max-width: 420px) {
    .header-container {
        gap: 0.55rem;
    }

    .site-logo__name {
        max-width: 8.5rem;
        white-space: nowrap;
        overflow: hidden;
        text-overflow: ellipsis;
    }

    .language-toggle {
        display: none;
    }
}

/* Accesibilidad: reducir movimiento */

@media (prefers-reduced-motion: reduce) {

    *,
    *::before,
    *::after {
        scroll-behavior: auto !important;
        transition-duration: 0.01ms !important;
        animation-duration: 0.01ms !important;
        animation-iteration-count: 1 !important;
    }
}