/* =============================================
   HEADER.CSS — Site Header, Mega Menu,
                Language Flags, Mobile Menu
   ============================================= */

/* ══════════════════════════════════════════════
   SITE HEADER
   ══════════════════════════════════════════════ */
.site-header {
    position: fixed;
    top: 0;
    left: 0;
    right: 0;
    height: var(--header-h);
    z-index: 1000;
    background: transparent;
    transition: background var(--t-mid), border-color var(--t-mid), backdrop-filter var(--t-mid);
    border-bottom: 1px solid transparent;
}

.site-header.is-scrolled {
    background: rgba(9, 12, 19, 0.94);
    backdrop-filter: blur(14px);
    -webkit-backdrop-filter: blur(14px);
    border-bottom-color: var(--border-subtle);
}

/* Version B — inner pages always solid */
.page-inner .site-header {
    background: rgba(9, 12, 19, 0.97);
    backdrop-filter: blur(14px);
    -webkit-backdrop-filter: blur(14px);
    border-bottom-color: var(--border-subtle);
}

.header-inner {
    display: flex;
    align-items: center;
    height: var(--header-h);
    gap: 24px;
}

/* ══════════════════════════════════════════════
   LOGO
   ══════════════════════════════════════════════ */
.header-logo {
    display: flex;
    align-items: center;
    flex-shrink: 0;
    transition: opacity var(--t-fast);
}

.header-logo:hover { opacity: 0.82; }

.logo-img {
    height: 44px;
    width: auto;
    display: block;
    object-fit: contain;
}

/* ══════════════════════════════════════════════
   MAIN NAVIGATION
   ══════════════════════════════════════════════ */
.header-nav {
    flex: 1;
    display: flex;
    justify-content: center;
}

.nav-list {
    display: flex;
    align-items: center;
}

/* Dropdown anchor point — must be relative so the
   single-column Products dropdown positions beneath it. */
.nav-item--mega {
    position: relative;
}

.nav-link {
    display: inline-flex;
    align-items: center;
    gap: 5px;
    padding: 10px 16px;
    font-family: var(--font-display);
    font-size: 0.88rem;
    font-weight: 600;
    letter-spacing: 0.1em;
    text-transform: uppercase;
    color: var(--text-secondary);
    white-space: nowrap;
    position: relative;
    transition: color var(--t-fast);
}

.nav-link:hover,
.nav-link.active { color: var(--text-primary); }

.nav-link::after {
    content: '';
    position: absolute;
    bottom: 4px;
    left: 16px;
    right: 16px;
    height: 2px;
    background: var(--accent);
    transform: scaleX(0);
    transform-origin: left center;
    transition: transform var(--t-mid);
}

.nav-link:hover::after,
.nav-link.active::after { transform: scaleX(1); }

.nav-arrow {
    transition: transform var(--t-mid);
    flex-shrink: 0;
}

.nav-item--mega:hover .nav-arrow {
    transform: rotate(180deg);
    color: var(--accent);
}

/* ══════════════════════════════════════════════
   MEGA MENU
   ══════════════════════════════════════════════ */
.mega-menu {
    position: fixed;
    top: var(--header-h);
    left: 0;
    right: 0;
    background: rgba(8, 11, 19, 0.97);
    backdrop-filter: blur(20px);
    -webkit-backdrop-filter: blur(20px);
    border-top: 1px solid var(--border-subtle);
    border-bottom: 2px solid var(--accent-border);
    opacity: 0;
    visibility: hidden;
    transform: translateY(-6px);
    transition:
        opacity    var(--t-mid),
        visibility var(--t-mid),
        transform  var(--t-mid);
    pointer-events: none;
    z-index: 999;
}

.nav-item--mega:hover .mega-menu,
.nav-item--mega.is-forced-open .mega-menu {
    opacity: 1;
    visibility: visible;
    transform: translateY(0);
    pointer-events: all;
}

/* ══════════════════════════════════════════════
   SINGLE-COLUMN DROPDOWN (Products)
   Anchored beneath the Products link instead of
   spanning the full viewport width.
   ══════════════════════════════════════════════ */
.mega-menu--single {
    position: absolute;                 /* anchor to the <li> */
    top: 100%;
    left: 0;
    right: auto;
    min-width: 300px;
    padding: 12px;
    background: rgba(8, 11, 19, 0.98);
    backdrop-filter: blur(20px);
    -webkit-backdrop-filter: blur(20px);
    border: 1px solid var(--border-subtle);
    border-top: 2px solid var(--accent);   /* industrial accent line */
    border-radius: 0;                   /* ★ sharp edges — design rule */
    box-shadow:
        0 20px 50px rgba(0, 0, 0, 0.55),
        0 0 0 1px rgba(245, 184, 0, 0.06);
}

.mega-menu__col {
    display: flex;
    flex-direction: column;
    gap: 4px;
}

.mega-menu__col-head {
    padding: 6px 12px 12px;
    margin-bottom: 4px;
    border-bottom: 1px solid var(--border-subtle);
}

/* Vertical compact links inside the single-column dropdown */
.mega-menu--single .mega-item {
    display: flex;
    align-items: stretch;
    background: transparent;
    border: 1px solid transparent;
    border-left: 3px solid transparent;
    overflow: hidden;
    transition: border-left-color var(--t-fast), background var(--t-fast), padding-left var(--t-fast);
}

.mega-menu--single .mega-item:hover {
    border-left-color: var(--accent);
    background: rgba(245, 184, 0, 0.06);
}

.mega-menu--single .mega-item__code {
    font-family: var(--font-display);
    font-size: 0.78rem;
    font-weight: 900;
    letter-spacing: 0.04em;
    color: var(--accent);
    padding: 9px 12px;
    min-width: 58px;
    border-right: 1px solid var(--border-subtle);
    background: rgba(245, 184, 0, 0.04);
    flex-shrink: 0;
    display: flex;
    align-items: center;
}

.mega-menu--single .mega-item__info {
    padding: 8px 12px;
    display: flex;
    flex-direction: column;
    justify-content: center;
    gap: 2px;
}

.mega-menu--single .mega-item__info strong {
    font-size: 0.72rem;
    font-weight: 600;
    color: var(--text-primary);
    line-height: 1.2;
}

.mega-menu--single .mega-item__info span {
    font-size: 0.66rem;
    color: var(--text-secondary);
}

/* CTA row at the bottom of the dropdown */
.mega-menu--single .mega-menu__cta {
    margin-top: 6px;
    padding-top: 10px;
    border-top: 1px solid var(--border-subtle);
    background: transparent;
}

.mega-menu--single .mega-menu__cta {
    display: flex;
    align-items: center;
    justify-content: space-between;
    width: 100%;
    padding: 10px 12px;
    font-family: var(--font-display);
    font-size: 0.7rem;
    font-weight: 800;
    letter-spacing: 0.14em;
    text-transform: uppercase;
    color: var(--accent);
    transition: background var(--t-fast), gap var(--t-fast);
}

.mega-menu--single .mega-menu__cta:hover {
    background: var(--accent-dim);
    gap: 16px;
}

.mega-menu__inner { padding: 36px 40px 32px; }

.mega-menu__header {
    display: flex;
    align-items: center;
    gap: 20px;
    margin-bottom: 24px;
    padding-bottom: 16px;
    border-bottom: 1px solid var(--border-subtle);
}

.mega-label {
    font-family: var(--font-display);
    font-size: 0.7rem;
    font-weight: 800;
    letter-spacing: 0.2em;
    color: var(--accent);
    text-transform: uppercase;
}

.mega-sep {
    width: 1px;
    height: 14px;
    background: var(--border-mid);
    flex-shrink: 0;
}

.mega-desc {
    font-size: 0.78rem;
    color: var(--text-muted);
    letter-spacing: 0.02em;
}

.mega-menu__grid {
    display: grid;
    grid-template-columns: repeat(4, 1fr);
    gap: 10px;
    margin-bottom: 24px;
}

.mega-item {
    display: flex;
    align-items: stretch;
    background: var(--bg-panel);
    border: 1px solid var(--border-subtle);
    border-left: 3px solid var(--accent-border);
    overflow: hidden;
    transition: border-left-color var(--t-fast), background var(--t-fast), transform var(--t-fast);
    cursor: pointer;
}

.mega-item:hover {
    border-left-color: var(--accent);
    background: rgba(245, 184, 0, 0.06);
    transform: translateY(-1px);
}

.mega-item__code {
    font-family: var(--font-display);
    font-size: 1rem;
    font-weight: 900;
    letter-spacing: 0.04em;
    color: var(--accent);
    padding: 14px;
    min-width: 70px;
    border-right: 1px solid var(--border-subtle);
    background: rgba(245, 184, 0, 0.04);
    flex-shrink: 0;
    display: flex;
    align-items: center;
}

.mega-item__info {
    padding: 10px 14px;
    display: flex;
    flex-direction: column;
    justify-content: center;
    gap: 3px;
}

.mega-item__info strong {
    font-size: 0.76rem;
    font-weight: 600;
    color: var(--text-primary);
    line-height: 1.25;
}

.mega-item__info span {
    font-size: 0.7rem;
    color: var(--text-secondary);
}

.mega-menu__footer {
    display: flex;
    align-items: center;
    justify-content: space-between;
    padding-top: 16px;
    border-top: 1px solid var(--border-subtle);
}

.mega-menu__cta {
    display: inline-flex;
    align-items: center;
    gap: 10px;
    padding: 9px 20px;
    font-family: var(--font-display);
    font-size: 0.72rem;
    font-weight: 800;
    letter-spacing: 0.14em;
    text-transform: uppercase;
    color: var(--accent);
    border: 1px solid var(--accent-border);
    transition: background var(--t-fast), gap var(--t-fast);
}

.mega-menu__cta:hover {
    background: var(--accent-dim);
    gap: 16px;
}

.mega-menu__note {
    font-size: 0.7rem;
    color: var(--text-muted);
    letter-spacing: 0.05em;
}

/* ══════════════════════════════════════════════
   LANGUAGE FLAGS
   ══════════════════════════════════════════════ */
.lang-flags {
    display: flex;
    align-items: center;
    gap: 8px;
    flex-shrink: 0;
}

.flag-btn {
    display: flex;
    align-items: center;
    justify-content: center;
    width: 42px;
    height: 42px;
    font-size: 1.45rem;
    border-radius: 4px;
    border: 1px solid transparent;
    background: transparent;
    cursor: pointer;
    line-height: 1;
    transition: border-color var(--t-fast), background var(--t-fast), transform var(--t-fast);
}

.flag-btn:hover {
    border-color: var(--border-mid);
    background: rgba(255, 255, 255, 0.06);
    transform: scale(1.12);
}

.flag-btn.active {
    border-color: var(--accent-border);
    background: var(--accent-dim);
}

/* ══════════════════════════════════════════════
   HAMBURGER BUTTON
   ══════════════════════════════════════════════ */
.hamburger {
    display: none;
    flex-direction: column;
    justify-content: center;
    align-items: flex-end;
    gap: 5px;
    width: 40px;
    height: 40px;
    flex-shrink: 0;
    padding: 6px;
}

.hamburger span {
    display: block;
    height: 2px;
    background: var(--text-primary);
    border-radius: 1px;
    transition: transform var(--t-mid), opacity var(--t-mid), width var(--t-mid);
}

.hamburger span:nth-child(1) { width: 24px; }
.hamburger span:nth-child(2) { width: 18px; }
.hamburger span:nth-child(3) { width: 24px; }

.hamburger.is-active span:nth-child(1) { transform: translateY(7px) rotate(45deg);  width: 24px; }
.hamburger.is-active span:nth-child(2) { opacity: 0; transform: scaleX(0); }
.hamburger.is-active span:nth-child(3) { transform: translateY(-7px) rotate(-45deg); width: 24px; }

/* ══════════════════════════════════════════════
   MOBILE MENU DRAWER
   ══════════════════════════════════════════════ */
.mobile-menu {
    position: fixed;
    top: var(--header-h);
    right: 0;
    bottom: 0;
    width: min(340px, 100vw);
    background: var(--bg-panel);
    border-left: 1px solid var(--border-subtle);
    transform: translateX(100%);
    transition: transform var(--t-slow);
    z-index: 999;
    overflow-y: auto;
    padding: 28px 24px 40px;
    display: flex;
    flex-direction: column;
}

.mobile-menu.is-open { transform: translateX(0); }

.mobile-overlay {
    position: fixed;
    inset: 0;
    background: rgba(0, 0, 0, 0.72);
    z-index: 998;
    opacity: 0;
    visibility: hidden;
    transition: opacity var(--t-mid), visibility var(--t-mid);
}

.mobile-overlay.is-visible { opacity: 1; visibility: visible; }

.mobile-nav-list { flex: 1; }

.mobile-nav-list > li { border-bottom: 1px solid var(--border-subtle); }

.mobile-nav-list > li > a,
.mobile-sub-toggle {
    display: flex;
    align-items: center;
    justify-content: space-between;
    width: 100%;
    padding: 15px 0;
    font-family: var(--font-display);
    font-size: 0.85rem;
    font-weight: 700;
    letter-spacing: 0.12em;
    text-transform: uppercase;
    color: var(--text-secondary);
    transition: color var(--t-fast);
    text-align: left;
}

.mobile-nav-list > li > a:hover,
.mobile-sub-toggle:hover,
.mobile-nav-list > li > a.active { color: var(--text-primary); }

.mobile-sub-toggle .toggle-icon {
    font-size: 1.2rem;
    line-height: 1;
    color: var(--accent);
    transition: transform var(--t-mid);
    font-style: normal;
}

.mobile-sub-toggle.is-active .toggle-icon { transform: rotate(45deg); }

.mobile-sub {
    display: none;
    padding: 4px 0 12px 12px;
}

.mobile-sub.is-open { display: block; }

.mobile-sub a {
    display: flex;
    align-items: center;
    gap: 10px;
    padding: 9px 0;
    font-size: 0.78rem;
    font-weight: 500;
    color: var(--text-secondary);
    transition: color var(--t-fast);
}

.mobile-sub a:hover { color: var(--text-primary); }

.mobile-sub .grade-code {
    font-family: var(--font-display);
    font-size: 0.82rem;
    font-weight: 800;
    color: var(--accent);
    min-width: 46px;
}

/* ── Mobile Language Switcher ── */
.mobile-langs {
    display: flex;
    gap: 8px;
    padding: 20px 0 4px;
    flex-wrap: wrap;
}

.mobile-lang-btn {
    display: flex;
    align-items: center;
    gap: 6px;
    padding: 6px 12px;
    font-size: 0.72rem;
    font-weight: 600;
    letter-spacing: 0.05em;
    color: var(--text-secondary);
    border: 1px solid var(--border-subtle);
    transition: color var(--t-fast), border-color var(--t-fast);
}

.mobile-lang-btn:hover,
.mobile-lang-btn.active {
    color: var(--accent);
    border-color: var(--accent-border);
}

/* ══════════════════════════════════════════════
   RESPONSIVE
   ══════════════════════════════════════════════ */
@media (max-width: 1100px) {
    .mega-menu__grid { grid-template-columns: repeat(2, 1fr); }
    .nav-link { padding: 10px 12px; }
}

@media (max-width: 860px) {
    .header-nav { display: none; }
    .lang-flags { display: none; }
    .hamburger  { display: flex; }
}

@media (max-width: 480px) {
    .container { padding: 0 20px; }
}