/* ============================================================
   AKNAIS Header / Navigation — header.css
   v1.0.0
   ============================================================ */

/* ── Site Header ──────────────────────────────────────────── */
.site-header {
  position: fixed;
  top: 0;
  left: 0;
  right: 0;
  z-index: var(--z-fixed);
  height: var(--header-height);
  display: flex;
  align-items: center;
  transition: border-color var(--transition-base), box-shadow var(--transition-base);
  border-bottom: 1px solid transparent;
}

.site-header::before {
  content: '';
  position: absolute;
  inset: 0;
  background: transparent;
  backdrop-filter: blur(0px);
  -webkit-backdrop-filter: blur(0px);
  transition: background var(--transition-base), backdrop-filter var(--transition-base);
  z-index: -1;
}

.site-header.scrolled::before {
  background: rgba(11,13,18,.82);
  backdrop-filter: blur(20px) saturate(180%);
  -webkit-backdrop-filter: blur(20px) saturate(180%);
}

.site-header.scrolled {
  border-bottom-color: var(--color-border);
  box-shadow: 0 4px 24px rgba(0,0,0,.35);
}

/* ── Header Inner ─────────────────────────────────────────── */
.header-inner {
  display: flex;
  align-items: center;
  gap: var(--space-8);
  width: 100%;
  max-width: var(--container-2xl);
  margin-inline: auto;
  padding-inline: var(--space-6);
}

/* ── Logo ─────────────────────────────────────────────────── */
.site-logo {
  display: flex;
  align-items: center;
  gap: var(--space-2);
  text-decoration: none;
  flex-shrink: 0;
}

.site-logo__mark {
  display: flex;
  align-items: center;
  justify-content: center;
  width: 36px;
  height: 36px;
  border-radius: var(--radius-lg);
  background: var(--gradient-violet);
  box-shadow: 0 4px 16px rgba(139,92,246,.4);
  flex-shrink: 0;
  transition: box-shadow var(--transition-base), transform var(--transition-base);
}

.site-logo:hover .site-logo__mark {
  box-shadow: 0 6px 24px rgba(139,92,246,.6);
  transform: scale(1.05);
}

.site-logo__mark svg { width: 20px; height: 20px; }

.site-logo__text {
  font-size: 1.25rem;
  font-weight: var(--font-black);
  color: var(--color-text-primary);
  letter-spacing: -0.03em;
  line-height: 1;
}

.site-logo__text span { color: var(--color-violet-light); }

/* ── Desktop Nav ──────────────────────────────────────────── */
.site-nav,
.main-nav {
  display: flex;
  align-items: center;
  gap: var(--space-1);
  flex: 1;
}

.nav-item { position: relative; }

.nav-link {
  display: flex;
  align-items: center;
  gap: var(--space-1);
  padding: var(--space-2) var(--space-3);
  font-size: var(--text-sm);
  font-weight: var(--font-medium);
  color: var(--color-text-secondary);
  text-decoration: none;
  border-radius: var(--radius-md);
  transition: color var(--transition-fast), background var(--transition-fast);
  white-space: nowrap;
  cursor: pointer;
  border: none;
  background: none;
  font-family: inherit;
  line-height: 1;
}

.nav-link:hover,
.nav-item:hover > .nav-link,
.nav-item.open > .nav-link {
  color: var(--color-text-primary);
  background: rgba(248,250,252,.06);
}

.nav-link.active-page { color: var(--color-violet-light); }

.nav-link__chevron {
  width: 14px;
  height: 14px;
  opacity: .6;
  transition: transform var(--transition-base), opacity var(--transition-fast);
  flex-shrink: 0;
}

.nav-item:hover > .nav-link .nav-link__chevron,
.nav-item.open  > .nav-link .nav-link__chevron {
  transform: rotate(180deg);
  opacity: 1;
}

/* ── Mega Menu ────────────────────────────────────────────── */
.mega-menu {
  position: absolute;
  top: calc(100% + var(--space-3));
  left: 50%;
  transform: translateX(-50%) translateY(-8px) scale(.97);
  transform-origin: top center;
  min-width: 480px;
  background: rgba(18,22,32,.96);
  backdrop-filter: blur(24px) saturate(200%);
  -webkit-backdrop-filter: blur(24px) saturate(200%);
  border: 1px solid var(--color-border);
  border-radius: var(--radius-2xl);
  box-shadow: var(--shadow-xl), 0 0 60px rgba(0,0,0,.4);
  padding: var(--space-5);
  opacity: 0;
  pointer-events: none;
  transition: opacity var(--transition-base), transform var(--transition-base);
  z-index: var(--z-dropdown);
}

.mega-menu.wide { min-width: 680px; }

.nav-item:hover > .mega-menu,
.nav-item.open  > .mega-menu {
  opacity: 1;
  pointer-events: all;
  transform: translateX(-50%) translateY(0) scale(1);
}

/* Bridge gap */
.mega-menu::before {
  content: '';
  position: absolute;
  top: -16px;
  left: 0;
  right: 0;
  height: 16px;
}

.mega-menu__grid { display: grid; gap: var(--space-2); }
.mega-menu__grid--2col { grid-template-columns: repeat(2, 1fr); }
.mega-menu__grid--3col { grid-template-columns: repeat(3, 1fr); }

.mega-menu__section-title {
  font-size: var(--text-xs);
  font-weight: var(--font-semibold);
  letter-spacing: var(--tracking-wider);
  text-transform: uppercase;
  color: var(--color-text-muted);
  padding: var(--space-2) var(--space-3);
  margin-bottom: var(--space-1);
}

.mega-menu__divider {
  height: 1px;
  background: var(--color-border);
  margin-block: var(--space-3);
}

.mega-menu__item {
  display: flex;
  align-items: center;
  gap: var(--space-3);
  padding: var(--space-3);
  border-radius: var(--radius-lg);
  text-decoration: none;
  color: var(--color-text-secondary);
  transition: background var(--transition-fast), color var(--transition-fast), transform var(--transition-fast);
}

.mega-menu__item:hover {
  background: rgba(139,92,246,.1);
  color: var(--color-text-primary);
  transform: translateX(3px);
}

.mega-menu__item-icon {
  display: flex;
  align-items: center;
  justify-content: center;
  width: 36px;
  height: 36px;
  border-radius: var(--radius-md);
  background: rgba(139,92,246,.1);
  border: 1px solid rgba(139,92,246,.15);
  font-size: 16px;
  flex-shrink: 0;
  transition: background var(--transition-fast);
}

.mega-menu__item:hover .mega-menu__item-icon {
  background: rgba(139,92,246,.2);
}

.mega-menu__item-info { flex: 1; min-width: 0; }

.mega-menu__item-name {
  display: block;
  font-size: var(--text-sm);
  font-weight: var(--font-semibold);
  color: var(--color-text-primary);
  line-height: 1.3;
  white-space: nowrap;
  overflow: hidden;
  text-overflow: ellipsis;
}

.mega-menu__item-desc {
  display: block;
  font-size: var(--text-xs);
  color: var(--color-text-muted);
  margin-top: 2px;
  line-height: 1.4;
}

/* ── Simple Dropdown ──────────────────────────────────────── */
.dropdown-menu {
  position: absolute;
  top: calc(100% + var(--space-3));
  left: 0;
  min-width: 200px;
  background: rgba(18,22,32,.96);
  backdrop-filter: blur(20px) saturate(200%);
  -webkit-backdrop-filter: blur(20px) saturate(200%);
  border: 1px solid var(--color-border);
  border-radius: var(--radius-xl);
  box-shadow: var(--shadow-xl);
  padding: var(--space-2);
  opacity: 0;
  pointer-events: none;
  transform: translateY(-6px) scale(.97);
  transform-origin: top left;
  transition: opacity var(--transition-base), transform var(--transition-base);
  z-index: var(--z-dropdown);
}

.dropdown-menu::before {
  content: '';
  position: absolute;
  top: -14px;
  left: 0;
  right: 0;
  height: 14px;
}

.nav-item:hover > .dropdown-menu,
.nav-item.open  > .dropdown-menu {
  opacity: 1;
  pointer-events: all;
  transform: translateY(0) scale(1);
}

.dropdown-menu__item {
  display: flex;
  align-items: center;
  gap: var(--space-3);
  padding: var(--space-2) var(--space-3);
  border-radius: var(--radius-md);
  text-decoration: none;
  color: var(--color-text-secondary);
  font-size: var(--text-sm);
  font-weight: var(--font-medium);
  transition: background var(--transition-fast), color var(--transition-fast);
}

.dropdown-menu__item:hover      { background: rgba(139,92,246,.1); color: var(--color-text-primary); }
.dropdown-menu__item.active-page{ color: var(--color-violet-light); background: rgba(139,92,246,.08); }

/* ── Header Actions ───────────────────────────────────────── */
.header-actions {
  display: flex;
  align-items: center;
  gap: var(--space-3);
  flex-shrink: 0;
  margin-left: auto;
}

/* Language Selector */
.lang-selector {
  display: flex;
  align-items: center;
  gap: var(--space-1);
  padding: var(--space-2) var(--space-3);
  font-size: var(--text-xs);
  font-weight: var(--font-semibold);
  letter-spacing: var(--tracking-wide);
  color: var(--color-text-secondary);
  background: rgba(248,250,252,.05);
  border: 1px solid var(--color-border);
  border-radius: var(--radius-md);
  cursor: pointer;
  transition: all var(--transition-fast);
  font-family: inherit;
  line-height: 1;
  white-space: nowrap;
}

.lang-selector:hover {
  color: var(--color-text-primary);
  background: rgba(248,250,252,.09);
  border-color: var(--color-border-hover);
}

.lang-selector__flag { font-size: 14px; line-height: 1; }

/* ── Hamburger / Nav Toggle ──────────────────────────────── */
.hamburger,
.nav-toggle {
  display: none;
  flex-direction: column;
  align-items: center;
  justify-content: center;
  width: 42px;
  height: 42px;
  gap: 5px;
  background: rgba(248,250,252,.05);
  border: 1px solid var(--color-border);
  border-radius: var(--radius-md);
  cursor: pointer;
  transition: background var(--transition-fast), border-color var(--transition-fast), transform var(--transition-fast);
  flex-shrink: 0;
  padding: 0;
  font-family: inherit;
  position: relative;
  z-index: var(--z-fixed);
}

.hamburger:hover,
.nav-toggle:hover {
  background: rgba(248,250,252,.1);
  border-color: var(--color-border-hover);
}

.hamburger:active,
.nav-toggle:active {
  transform: scale(0.95);
}

.hamburger__line,
.nav-toggle span {
  display: block;
  width: 22px;
  height: 2px;
  background: var(--color-text-primary);
  border-radius: 2px;
  transition: transform var(--transition-base), opacity var(--transition-base), width var(--transition-base), background-color var(--transition-fast);
  transform-origin: center;
}

/* Active / Open state (transforms lines into an 'X') */
.hamburger.open .hamburger__line:nth-child(1),
.nav-toggle.open span:nth-child(1),
.nav-toggle.active span:nth-child(1) {
  transform: translateY(7px) rotate(45deg);
}

.hamburger.open .hamburger__line:nth-child(2),
.nav-toggle.open span:nth-child(2),
.nav-toggle.active span:nth-child(2) {
  opacity: 0;
  transform: scaleX(0);
}

.hamburger.open .hamburger__line:nth-child(3),
.nav-toggle.open span:nth-child(3),
.nav-toggle.active span:nth-child(3) {
  transform: translateY(-7px) rotate(-45deg);
}

/* ── Mobile Menu ──────────────────────────────────────────── */
.mobile-menu {
  position: fixed;
  top: 0;
  left: 0;
  right: 0;
  bottom: 0;
  z-index: calc(var(--z-fixed) - 1);
  background: rgba(11,13,18,.98);
  backdrop-filter: blur(28px) saturate(180%);
  -webkit-backdrop-filter: blur(28px) saturate(180%);
  display: flex;
  flex-direction: column;
  padding-top: var(--header-height);
  transform: translateX(100%);
  transition: transform var(--transition-spring), opacity var(--transition-fast);
  overflow-y: auto;
  -webkit-overflow-scrolling: touch;
  opacity: 0;
  pointer-events: none;
}

.mobile-menu.open {
  transform: translateX(0);
  opacity: 1;
  pointer-events: auto;
}

.mobile-menu__inner {
  padding: var(--space-6) var(--space-5) var(--space-12);
  flex: 1;
  display: flex;
  flex-direction: column;
  gap: var(--space-4);
  max-width: 560px;
  width: 100%;
  margin-inline: auto;
}

.mobile-menu__section-title {
  font-size: var(--text-xs);
  font-weight: var(--font-bold);
  letter-spacing: var(--tracking-wider);
  text-transform: uppercase;
  color: var(--color-text-muted);
  padding: var(--space-2) var(--space-3) var(--space-1);
  margin-top: var(--space-3);
  display: flex;
  align-items: center;
  gap: var(--space-2);
}

.mobile-menu__section-title::after {
  content: '';
  flex: 1;
  height: 1px;
  background: var(--color-border);
}

.mobile-menu__links {
  list-style: none;
  margin: 0;
  padding: 0;
  display: flex;
  flex-direction: column;
  gap: 2px;
}

.mobile-menu__link {
  display: flex;
  align-items: center;
  gap: var(--space-3);
  padding: var(--space-3) var(--space-4);
  font-size: var(--text-base);
  font-weight: var(--font-medium);
  color: var(--color-text-secondary);
  text-decoration: none;
  border-radius: var(--radius-lg);
  transition: color var(--transition-fast), background var(--transition-fast), transform var(--transition-fast);
  line-height: 1.4;
}

.mobile-menu__link:hover,
.mobile-menu__link:active {
  color: var(--color-text-primary);
  background: rgba(139,92,246,.12);
  transform: translateX(4px);
}

.mobile-nav {
  display: flex;
  flex-direction: column;
  gap: var(--space-1);
}

.mobile-nav__item {
  border-radius: var(--radius-lg);
  overflow: hidden;
  border: 1px solid transparent;
  transition: border-color var(--transition-fast);
}

.mobile-nav__item.open {
  border-color: var(--color-border);
  background: rgba(248,250,252,.02);
}

.mobile-nav__link {
  display: flex;
  align-items: center;
  justify-content: space-between;
  padding: var(--space-4);
  font-size: var(--text-base);
  font-weight: var(--font-semibold);
  color: var(--color-text-primary);
  text-decoration: none;
  border-radius: var(--radius-lg);
  cursor: pointer;
  border: none;
  background: none;
  width: 100%;
  font-family: inherit;
  text-align: left;
  transition: background var(--transition-fast), color var(--transition-fast);
}

.mobile-nav__link:hover { background: rgba(248,250,252,.05); color: var(--color-violet-light); }

.mobile-nav__item.open > .mobile-nav__link .nav-link__chevron { transform: rotate(180deg); }

.mobile-nav__sub {
  display: none;
  flex-direction: column;
  gap: var(--space-1);
  padding: var(--space-2) var(--space-4) var(--space-3);
  border-top: 1px solid var(--color-border);
}

.mobile-nav__item.open > .mobile-nav__sub { display: flex; }

.mobile-nav__sub-link {
  display: flex;
  align-items: center;
  gap: var(--space-3);
  padding: var(--space-3);
  font-size: var(--text-sm);
  color: var(--color-text-secondary);
  text-decoration: none;
  border-radius: var(--radius-md);
  transition: color var(--transition-fast), background var(--transition-fast);
}

.mobile-nav__sub-link:hover {
  color: var(--color-text-primary);
  background: rgba(139,92,246,.1);
}

.mobile-nav__sub-icon {
  font-size: 16px;
  width: 20px;
  text-align: center;
  flex-shrink: 0;
}

.mobile-menu__footer {
  padding: var(--space-6);
  border-top: 1px solid var(--color-border);
  display: flex;
  flex-direction: column;
  gap: var(--space-3);
}

.mobile-menu__actions {
  display: flex;
  flex-direction: column;
  gap: var(--space-3);
  padding-top: var(--space-5);
  border-top: 1px solid var(--color-border);
  margin-top: var(--space-4);
}

.mobile-menu__actions .btn {
  width: 100%;
  justify-content: center;
  padding-block: var(--space-3);
}

/* ── Responsive ───────────────────────────────────────────── */
@media (max-width: 1024px) {
  .site-nav,
  .main-nav {
    display: none !important;
  }
  .hamburger,
  .nav-toggle {
    display: flex !important;
  }
  .header-inner {
    justify-content: space-between;
    gap: var(--space-4);
  }
}

@media (max-width: 768px) {
  .header-inner {
    padding-inline: var(--space-4);
    gap: var(--space-3);
  }
  .header-actions .btn {
    display: none !important;
  }
  .header-actions {
    gap: var(--space-2);
    margin-left: auto;
  }
}

@media (max-width: 480px) {
  :root {
    --header-height: 60px;
  }
  .site-header {
    height: 60px;
  }
  .mobile-menu {
    padding-top: 60px;
  }
  .site-logo__text {
    font-size: 1.125rem;
  }
  .site-logo__mark {
    width: 32px;
    height: 32px;
  }
  .site-logo__mark svg {
    width: 18px;
    height: 18px;
  }
  .mobile-menu__inner {
    padding: var(--space-4) var(--space-3) var(--space-10);
  }
  .mobile-menu__link {
    padding: 0.65rem var(--space-3);
    font-size: 0.95rem;
  }
}