/* ==========================================================================
   HEADER / NAVBAR
   ========================================================================== */

.site-header {
    position: sticky;
    top: 0;
    z-index: var(--z-sticky);
    width: 100%;
    background-color: var(--color-bg-default);
    border-bottom: 1px solid var(--color-line-100);
    transition: box-shadow var(--transition-base);
}

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

.site-header__inner {
    display: flex;
    align-items: center;
    justify-content: space-between;
    padding-block: var(--space-4);
    gap: var(--space-4);
}

/* ---------- Logo ---------- */
.site-header__logo {
    display: inline-flex;
    align-items: center;
    justify-content: center;
    flex-shrink: 0;
}

.site-logo {
    display: inline-flex;
    align-items: center;
    line-height: 1;
}

.site-logo__wordmark {
    width: 160px;
    height: auto;
}

/* Versione del logo in contesti scuri (footer, modal overlay).
   Il SVG caricato ha fill nero fisso: in contesti scuri lo invertiamo
   con filter. Quando passeremo a un SVG inline con fill=currentColor
   questa regola potrà essere rimossa. */
.site-logo--on-dark .site-logo__wordmark {
    filter: invert(1);
}

/* ---------- Nav principale (desktop) ---------- */
.site-nav {
    display: none;
    align-items: center;
    gap: var(--space-8);
}

.site-nav__link {
    position: relative;
    font-family: var(--font-body);
    font-size: var(--fs-base);
    font-weight: var(--fw-regular);
    letter-spacing: var(--ls-wider);
    color: var(--color-ink-600);
    text-transform: uppercase;
    transition: color var(--transition-base);
    padding-block: var(--space-1);
}

.site-nav__link::after {
    content: "";
    position: absolute;
    left: 0;
    right: 0;
    bottom: -2px;
    height: 1px;
    background-color: currentColor;
    transform: scaleX(0);
    transform-origin: left center;
    transition: transform var(--transition-base);
}

.site-nav__link:hover,
.site-nav__link:focus-visible,
.site-nav__link.is-active {
    color: var(--color-ink-800);
}

.site-nav__link:hover::after,
.site-nav__link:focus-visible::after,
.site-nav__link.is-active::after {
    transform: scaleX(1);
}

/* ---------- Language dropdown ---------- */
.lang-switch {
    position: relative;
    margin-left: var(--space-6);
    padding-left: var(--space-6);
    border-left: 1px solid var(--color-line-200);
}

.lang-switch__toggle {
    display: inline-flex;
    align-items: center;
    gap: var(--space-2);
    font-size: var(--fs-xs);
    font-weight: var(--fw-medium);
    color: var(--color-ink-600);
    letter-spacing: var(--ls-wider);
    padding: var(--space-1) var(--space-2);
}

.lang-switch__toggle .chevron {
    width: 10px;
    height: 10px;
    transition: transform var(--transition-base);
}

.lang-switch[aria-expanded="true"] .chevron {
    transform: rotate(180deg);
}

.lang-switch__menu {
    position: absolute;
    top: calc(100% + var(--space-2));
    right: 0;
    min-width: 120px;
    background-color: var(--color-bg-default);
    border: 1px solid var(--color-line-200);
    border-radius: var(--radius-xs);
    box-shadow: var(--shadow-md);
    padding: var(--space-2) 0;
    z-index: var(--z-sticky);
    display: none;
}

.lang-switch[aria-expanded="true"] .lang-switch__menu {
    display: block;
}

.lang-switch__item {
    display: flex;
    width: 100%;
    align-items: center;
    gap: var(--space-2);
    padding: var(--space-2) var(--space-4);
    font-size: var(--fs-xs);
    font-weight: var(--fw-medium);
    color: var(--color-ink-600);
    letter-spacing: var(--ls-wider);
    text-transform: uppercase;
    text-align: left;
    transition: background-color var(--transition-fast), color var(--transition-fast);
}

.lang-switch__item:hover,
.lang-switch__item:focus-visible {
    background-color: var(--color-bg-warm);
    color: var(--color-ink-800);
}

.lang-switch__item.is-current {
    color: var(--color-brand);
}

/* ---------- Icone header ---------- */
.site-header__icons {
    display: none;
    align-items: center;
    gap: var(--space-4);
    margin-left: var(--space-4);
}

.icon-btn {
    color: var(--color-ink-600);
    line-height: 0;
    padding: var(--space-2);
    transition: color var(--transition-base);
}

.icon-btn:hover,
.icon-btn:focus-visible {
    color: var(--color-ink-800);
}

.icon-btn svg {
    width: 20px;
    height: 20px;
}

/* ---------- Blocco mobile (lang compact + hamburger) ---------- */
.site-header__mobile {
    display: flex;
    align-items: center;
    gap: var(--space-4);
}

.lang-compact {
    display: inline-flex;
    gap: var(--space-2);
}

.lang-compact__btn {
    font-size: var(--fs-xs);
    font-weight: var(--fw-medium);
    color: var(--color-ink-400);
    letter-spacing: var(--ls-wider);
}

.lang-compact__btn.is-current {
    color: var(--color-ink-600);
}

.menu-toggle {
    color: var(--color-ink-800);
    line-height: 0;
    padding: var(--space-2);
}

.menu-toggle svg {
    width: 24px;
    height: 24px;
}

/* ---------- Mobile menu ---------- */
.mobile-menu {
    display: none;
    flex-direction: column;
    padding-block: var(--space-4);
    border-top: 1px solid var(--color-line-100);
    gap: var(--space-4);
    margin-top: var(--space-4);
}

.mobile-menu.is-open {
    display: flex;
}

.mobile-menu__link {
    font-family: var(--font-body);
    font-size: var(--fs-base);
    font-weight: var(--fw-regular);
    letter-spacing: var(--ls-wider);
    color: var(--color-ink-600);
    text-transform: uppercase;
    padding-block: var(--space-2);
}

.mobile-menu__link:hover,
.mobile-menu__link:focus-visible {
    color: var(--color-ink-800);
}

/* ---------- Breakpoint desktop ---------- */
@media (min-width: 768px) {
    .site-nav,
    .site-header__icons {
        display: flex;
    }

    .site-header__mobile {
        display: none;
    }

    .mobile-menu {
        display: none !important; /* mai visibile su desktop */
    }
}