/* ═══════════════════════════════════════════════
   AMGOO V2 — Header
   ═══════════════════════════════════════════════ */

#site-header {
  position: fixed;
  top: 0; left: 0; right: 0;
  z-index: 1000;
  background: rgba(10, 22, 40, 0.95);
  backdrop-filter: blur(12px);
  -webkit-backdrop-filter: blur(12px);
  border-bottom: 1px solid rgba(255,255,255,0.06);
  transition: all var(--transition-base);
}

#site-header.scrolled {
  background: rgba(10, 22, 40, 0.98);
  box-shadow: 0 2px 20px rgba(0,0,0,0.3);
}

.header-inner {
  display: flex;
  align-items: center;
  justify-content: space-between;
  height: 64px;
}

.logo-text {
  font-size: 1.5rem;
  font-weight: 800;
  color: #fff;
  letter-spacing: 0.05em;
}

.logo-text::before {
  content: '';
  display: inline-block;
  width: 8px;
  height: 8px;
  background: var(--orange-500);
  border-radius: 50%;
  margin-right: 8px;
  vertical-align: middle;
}

.main-nav {
  display: flex;
  align-items: center;
  gap: var(--space-xl);
}

.nav-link {
  color: var(--gray-300);
  font-size: 0.9rem;
  font-weight: 500;
  padding: var(--space-xs) 0;
  position: relative;
  transition: color var(--transition-fast);
}

.nav-link::after {
  content: '';
  position: absolute;
  bottom: -2px;
  left: 0;
  width: 0;
  height: 2px;
  background: var(--orange-500);
  transition: width var(--transition-base);
}

.nav-link:hover,
.nav-link.active {
  color: #fff;
}

.nav-link:hover::after,
.nav-link.active::after {
  width: 100%;
}

.header-actions {
  display: flex;
  align-items: center;
  gap: var(--space-md);
}

/* Language Selector */
.lang-selector {
  position: relative;
}

.lang-btn {
  display: flex;
  align-items: center;
  gap: var(--space-xs);
  background: transparent;
  border: 1px solid rgba(255,255,255,0.2);
  color: var(--gray-300);
  padding: 0.35rem 0.75rem;
  border-radius: var(--radius-md);
  font-size: 0.8rem;
  transition: all var(--transition-fast);
}

.lang-btn:hover {
  border-color: rgba(255,255,255,0.4);
  color: #fff;
}

.lang-dropdown {
  position: absolute;
  top: calc(100% + 8px);
  right: 0;
  background: var(--blue-800);
  border: 1px solid rgba(255,255,255,0.1);
  border-radius: var(--radius-md);
  padding: var(--space-xs);
  min-width: 160px;
  opacity: 0;
  visibility: hidden;
  transform: translateY(-8px);
  transition: all var(--transition-base);
  box-shadow: var(--shadow-lg);
}

.lang-dropdown.show {
  opacity: 1;
  visibility: visible;
  transform: translateY(0);
}

.lang-option {
  display: block;
  padding: 0.5rem 0.75rem;
  color: var(--gray-300);
  font-size: 0.85rem;
  border-radius: var(--radius-sm);
  transition: all var(--transition-fast);
}

.lang-option:hover,
.lang-option.active {
  background: rgba(255,255,255,0.08);
  color: #fff;
}

/* Mobile Toggle */
.mobile-toggle {
  display: none;
  flex-direction: column;
  gap: 5px;
  background: transparent;
  border: none;
  padding: var(--space-xs);
  cursor: pointer;
}

.mobile-toggle span {
  display: block;
  width: 22px;
  height: 2px;
  background: #fff;
  border-radius: 2px;
  transition: all var(--transition-base);
}

.mobile-toggle.open span:nth-child(1) { transform: rotate(45deg) translate(5px, 5px); }
.mobile-toggle.open span:nth-child(2) { opacity: 0; }
.mobile-toggle.open span:nth-child(3) { transform: rotate(-45deg) translate(5px, -5px); }

/* Mobile Nav Overlay */
.mobile-nav-overlay {
  position: fixed;
  inset: 0;
  z-index: 999;
  background: rgba(10, 22, 40, 0.97);
  display: flex;
  align-items: center;
  justify-content: center;
  opacity: 0;
  visibility: hidden;
  transition: all var(--transition-base);
}

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

.mobile-nav {
  display: flex;
  flex-direction: column;
  align-items: center;
  gap: var(--space-lg);
}

.mobile-nav .nav-link {
  font-size: 1.25rem;
  color: var(--gray-300);
}

.mobile-nav .nav-link:hover,
.mobile-nav .nav-link.active {
  color: var(--orange-500);
}

.mobile-lang {
  display: flex;
  gap: var(--space-md);
  margin-top: var(--space-xl);
  padding-top: var(--space-lg);
  border-top: 1px solid rgba(255,255,255,0.1);
}

.mobile-lang .lang-option {
  font-size: 0.85rem;
}

@media (max-width: 768px) {
  .main-nav, .header-cta, .lang-selector { display: none; }
  .mobile-toggle { display: flex; }
}