/* ==========================================================================
   Header, navigation, mobile menu (header.css)
   ========================================================================== */

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

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

.header-inner {
    display: flex;
    align-items: center;
    gap: 1rem;
    min-height: 4rem;
}

/* ---------- Logo ---------- */

.logo {
    display: inline-flex;
    align-items: center;
    gap: 0.55rem;
    text-decoration: none;
    color: var(--color-text);
    font-weight: 750;
    font-size: 1.2rem;
    letter-spacing: -0.02em;
    border-radius: var(--radius-sm);
}

.logo__mark {
    flex: 0 0 auto;
}

/* ---------- Desktop nav ---------- */

.main-nav {
    display: none;
    align-items: center;
    gap: 0.35rem;
    margin-inline-start: 1.25rem;
}

.nav-link {
    display: inline-flex;
    align-items: center;
    gap: 0.35rem;
    min-height: var(--control-height);
    padding: 0.4rem 0.85rem;
    border-radius: var(--radius-md);
    color: var(--color-text-muted);
    font-weight: 550;
    font-size: 0.95rem;
    text-decoration: none;
    background: transparent;
    transition: background-color var(--transition-fast), color var(--transition-fast);
}

.nav-link:hover {
    color: var(--color-text);
    background: var(--color-surface);
}

.nav-dropdown {
    position: relative;
}

.nav-dropdown__btn .icon-chev {
    width: 1rem;
    height: 1rem;
    transition: transform var(--transition-base);
}

.nav-dropdown__btn[aria-expanded="true"] .icon-chev {
    transform: rotate(180deg);
}

.dropdown-panel {
    position: absolute;
    top: calc(100% + 0.4rem);
    inset-inline-start: 0;
    z-index: var(--z-search);
    width: 17rem;
    background: var(--color-background);
    border: 1px solid var(--color-border);
    border-radius: var(--radius-lg);
    box-shadow: var(--shadow-lg);
    padding: 0.4rem;
    display: grid;
}

.dropdown-panel__link {
    display: flex;
    align-items: center;
    gap: 0.7rem;
    padding: 0.6rem 0.7rem;
    border-radius: var(--radius-sm);
    text-decoration: none;
    color: var(--color-text);
    font-size: 0.925rem;
    font-weight: 550;
    transition: background-color var(--transition-fast);
}

.dropdown-panel__link:hover {
    background: var(--color-primary-soft);
    color: var(--color-primary-active);
}

.dropdown-panel__link svg {
    width: 1.25rem;
    height: 1.25rem;
    color: var(--color-primary);
}

/* ---------- Header actions ---------- */

.header-actions {
    display: flex;
    align-items: center;
    gap: 0.75rem;
    margin-inline-start: auto;
}

.header-search {
    display: none;
    width: 15.5rem;
}

.header-search .search-box__input {
    min-height: 2.6rem;
    padding-inline: 2.6rem 2.6rem;
    font-size: 0.9rem;
    background: var(--color-surface);
    border-color: transparent;
}

.header-search .search-box__input:focus {
    background: var(--color-background);
    border-color: var(--color-primary);
}

.header-search .search-box__icon {
    width: 1.05rem;
    height: 1.05rem;
    inset-inline-start: 0.8rem;
}

.header-lang {
    font-size: 0.9rem;
    font-weight: 550;
    color: var(--color-text-muted);
    white-space: nowrap;
}

.lang-switch {
    display: inline-flex;
    align-items: center;
    gap: 0.4rem;
}

.lang-switch__sep {
    color: var(--color-border-strong);
}

.lang-switch__current {
    color: var(--color-text);
    font-weight: 700;
}

.lang-switch__link {
    color: var(--color-text-muted);
    text-decoration: none;
    border-radius: 2px;
}

.lang-switch__link:hover {
    color: var(--color-primary);
    text-decoration: underline;
}

/* ---------- Menu button ---------- */

.menu-btn {
    display: inline-flex;
    align-items: center;
    gap: 0.5rem;
    min-width: var(--control-height);
    min-height: var(--control-height);
    justify-content: center;
    border-radius: var(--radius-md);
    color: var(--color-text);
    transition: background-color var(--transition-fast);
}

.menu-btn:hover {
    background: var(--color-surface);
}

.menu-btn__icon {
    width: 1.5rem;
    height: 1.5rem;
}

/* icon-only burger on mobile (label stays for screen readers) */
@media (max-width: 63.99em) {
    .menu-btn__open,
    .menu-btn__close {
        display: none;
    }
}

.menu-btn__open,
.menu-btn__close {
    font-size: 0.85rem;
    font-weight: 600;
}

/* ---------- Mobile panel ---------- */

.mobile-panel {
    border-top: 1px solid var(--color-border);
    background: var(--color-background);
    padding: 1rem clamp(1rem, 4vw, 2rem) 1.5rem;
    max-height: calc(100vh - 4rem);
    overflow-y: auto;
}

.mobile-panel__nav {
    display: flex;
    flex-direction: column;
    gap: 0.15rem;
}

.mobile-panel__link {
    display: flex;
    align-items: center;
    min-height: var(--control-height);
    padding: 0.4rem 0.6rem;
    border-radius: var(--radius-md);
    color: var(--color-text);
    font-weight: 600;
    text-decoration: none;
    transition: background-color var(--transition-fast);
}

.mobile-panel__link:hover {
    background: var(--color-surface);
}

.mobile-panel__group-title {
    margin: 0.9rem 0.6rem 0.35rem;
    font-size: 0.78rem;
    font-weight: 700;
    text-transform: uppercase;
    letter-spacing: 0.07em;
    color: var(--color-text-faint);
}

html[lang="ar"] .mobile-panel__group-title {
    letter-spacing: 0;
}

.mobile-panel__group {
    display: grid;
    grid-template-columns: 1fr;
}

.mobile-panel__sublink {
    display: flex;
    align-items: center;
    gap: 0.6rem;
    min-height: 2.75rem;
    padding: 0.35rem 0.6rem;
    border-radius: var(--radius-sm);
    color: var(--color-text-muted);
    font-weight: 500;
    text-decoration: none;
    transition: background-color var(--transition-fast), color var(--transition-fast);
}

.mobile-panel__sublink:hover {
    background: var(--color-primary-soft);
    color: var(--color-primary-active);
}

.mobile-panel__sublink svg {
    width: 1.15rem;
    height: 1.15rem;
    color: var(--color-primary);
}

.mobile-panel__lang {
    margin-top: 1.1rem;
    padding-top: 1rem;
    border-top: 1px solid var(--color-border);
}

.mobile-panel__search {
    margin-bottom: 0.9rem;
}

/* ---------- Breakpoint to desktop ---------- */

@media (min-width: 64em) {
    .main-nav {
        display: flex;
    }

    .header-search {
        display: block;
    }

    .menu-btn {
        display: none;
    }

    .mobile-panel {
        display: none !important;
    }

    .features-grid {
        grid-template-columns: repeat(2, 1fr);
        gap: 1.75rem 3rem;
    }
}