/* GLOBAL HEADER & NAVIGATION SYSTEM */

.site-header {
  position: sticky;
  top: 0;
  left: 0;
  width: 100%;
  background: var(--color-white);
  box-shadow: 0 2px 15px rgba(0, 0, 0, 0.06);
  z-index: var(--z-header);
  transition: all var(--transition-fast);
}

.site-header.scrolled {
  box-shadow: 0 4px 20px rgba(0, 0, 0, 0.12);
  background: rgba(255, 255, 255, 0.98);
  backdrop-filter: blur(10px);
}

.header-container {
  display: flex;
  align-items: center;
  justify-content: space-between;
  height: 84px;
  transition: height var(--transition-fast);
}

.site-header.scrolled .header-container {
  height: 72px;
}

.header-logo {
  display: flex;
  align-items: center;
  gap: 12px;
  text-decoration: none;
}

.header-logo img {
  height: 54px;
  width: auto;
  transition: height var(--transition-fast);
}

.site-header.scrolled .header-logo img {
  height: 44px;
}

/* Desktop Nav */
.nav-menu {
  display: flex;
  align-items: center;
  gap: 28px;
  list-style: none;
}

.nav-item {
  position: relative;
}

.nav-link {
  font-family: var(--font-heading);
  font-size: 0.95rem;
  font-weight: 600;
  color: var(--color-dark);
  padding: 10px 0;
  display: flex;
  align-items: center;
  gap: 6px;
  position: relative;
  transition: color var(--transition-fast);
}

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

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

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

/* Dropdown Menu */
.dropdown-menu {
  position: absolute;
  top: 100%;
  left: 0;
  min-width: 240px;
  background: var(--color-white);
  border: 1px solid var(--color-border);
  border-radius: var(--radius-md);
  box-shadow: var(--shadow-lg);
  padding: 10px;
  opacity: 0;
  visibility: hidden;
  transform: translateY(10px);
  transition: all var(--transition-fast);
  z-index: var(--z-dropdown);
  list-style: none;
}

.nav-item:hover .dropdown-menu {
  opacity: 1;
  visibility: visible;
  transform: translateY(0);
}

.dropdown-link {
  display: flex;
  align-items: center;
  gap: 10px;
  padding: 10px 14px;
  font-size: 0.9rem;
  font-weight: 500;
  color: var(--color-body);
  border-radius: var(--radius-sm);
  transition: all var(--transition-fast);
  text-decoration: none;
}

.dropdown-link:hover {
  background-color: var(--color-primary-light);
  color: var(--color-primary);
  transform: translateX(4px);
}

.dropdown-icon {
  font-size: 0.75rem;
  transition: transform var(--transition-fast);
}

.nav-item:hover .dropdown-icon {
  transform: rotate(180deg);
}

/* Mobile Hamburger Toggle */
.mobile-toggle {
  display: none;
  flex-direction: column;
  justify-content: space-between;
  width: 28px;
  height: 20px;
  background: none;
  border: none;
  cursor: pointer;
  z-index: 1100;
}

.mobile-toggle span {
  display: block;
  width: 100%;
  height: 3px;
  background-color: var(--color-dark);
  border-radius: 2px;
  transition: all var(--transition-fast);
}

.mobile-toggle.active span:nth-child(1) {
  transform: translateY(8.5px) rotate(45deg);
}

.mobile-toggle.active span:nth-child(2) {
  opacity: 0;
}

.mobile-toggle.active span:nth-child(3) {
  transform: translateY(-8.5px) rotate(-45deg);
}

/* Mobile Menu Drawer */
.mobile-menu-drawer {
  position: fixed;
  top: 0;
  right: -100%;
  width: 100%;
  max-width: 340px;
  height: 100vh;
  background: var(--color-white);
  box-shadow: var(--shadow-lg);
  z-index: 1050;
  padding: 90px 24px 30px 24px;
  display: flex;
  flex-direction: column;
  overflow-y: auto;
  transition: right var(--transition-normal);
}

.mobile-menu-drawer.open {
  right: 0;
}

.mobile-nav-list {
  display: flex;
  flex-direction: column;
  gap: 16px;
  list-style: none;
}

.mobile-nav-link {
  font-family: var(--font-heading);
  font-size: 1.1rem;
  font-weight: 600;
  color: var(--color-dark);
  display: flex;
  align-items: center;
  justify-content: space-between;
  padding: 8px 0;
  text-decoration: none;
}

.mobile-submenu {
  display: none;
  flex-direction: column;
  gap: 10px;
  padding-left: 16px;
  margin-top: 8px;
  border-left: 2px solid var(--color-primary-light);
}

.mobile-submenu.open {
  display: flex;
}

.mobile-submenu-link {
  font-size: 0.95rem;
  color: var(--color-muted);
  text-decoration: none;
}

.mobile-submenu-link:hover {
  color: var(--color-primary);
}

.overlay-backdrop {
  position: fixed;
  inset: 0;
  background: var(--color-overlay-dark);
  z-index: 1040;
  opacity: 0;
  visibility: hidden;
  transition: all var(--transition-fast);
}

.overlay-backdrop.active {
  opacity: 1;
  visibility: visible;
}