/* v2.1.0: Header & Navigation */
.header {
  background: white;
  height: var(--header-height);
  position: sticky;
  top: 0;
  z-index: 1000;
  box-shadow: var(--shadow-sm);
}

.header .container {
  display: flex;
  justify-content: space-between;
  align-items: center;
  height: 100%;
}

/* Logo */
.logo {
  display: flex;
  align-items: center;
  gap: var(--space-md);
}

.logo-img {
  height: 50px;
  width: auto;
}

.logo-text {
  display: flex;
  flex-direction: column;
}

.logo-name {
  font-family: var(--font-display);
  font-size: 1.125rem;
  font-weight: 600;
  color: var(--gray-900);
  line-height: 1.2;
}

.logo-tagline {
  font-size: 0.75rem;
  color: var(--text-muted);
}

/* Navigation */
.nav-list {
  display: flex;
  align-items: center;
  gap: var(--space-xs);
}

.nav-list > li > a {
  display: flex;
  align-items: center;
  gap: var(--space-xs);
  padding: var(--space-sm) var(--space-md);
  font-size: 0.9375rem;
  font-weight: 500;
  color: var(--gray-700);
  border-radius: var(--radius);
  transition: all var(--transition);
}

.nav-list > li > a:hover,
.nav-list > li > a.active {
  color: var(--primary);
  background: var(--green-50);
}

.btn-nav {
  background: var(--primary) !important;
  color: white !important;
  margin-left: var(--space-sm);
}

.btn-nav:hover {
  background: var(--primary-dark) !important;
}

/* Dropdown Navigation */
.has-dropdown {
  position: relative;
}

.has-dropdown > a {
  gap: var(--space-xs);
}

.dropdown-arrow {
  flex-shrink: 0;
  transition: transform 0.2s ease;
}

.has-dropdown:hover > a .dropdown-arrow {
  transform: rotate(180deg);
}

.dropdown-menu {
  list-style: none;
  position: absolute;
  top: 100%;
  left: 50%;
  transform: translateX(-50%) translateY(8px);
  min-width: 200px;
  background: white;
  border-radius: var(--radius);
  box-shadow: 0 4px 24px rgba(0, 0, 0, 0.12), 0 1px 4px rgba(0, 0, 0, 0.08);
  padding: var(--space-xs);
  opacity: 0;
  visibility: hidden;
  transition: opacity 0.2s ease, transform 0.2s ease, visibility 0.2s;
  z-index: 100;
}

/* Invisible hover bridge so mouse can travel from parent to menu */
.has-dropdown::after {
  content: '';
  position: absolute;
  top: 100%;
  left: 0;
  right: 0;
  height: 12px;
  display: none;
}

.has-dropdown:hover::after {
  display: block;
}

.has-dropdown:hover > .dropdown-menu,
.has-dropdown.dropdown-open > .dropdown-menu {
  opacity: 1;
  visibility: visible;
  transform: translateX(-50%) translateY(0);
}

.dropdown-menu li {
  margin: 0;
}

.dropdown-menu a {
  display: block;
  padding: 8px 14px;
  font-size: 0.875rem;
  font-weight: 450;
  color: var(--gray-700);
  border-radius: calc(var(--radius) - 2px);
  transition: all 0.15s ease;
  white-space: nowrap;
}

.dropdown-menu a:hover,
.dropdown-menu a.active {
  background: var(--green-50);
  color: var(--primary);
}

/* Mobile Toggle */
.mobile-toggle {
  display: none;
  flex-direction: column;
  justify-content: center;
  align-items: center;
  width: 44px;
  height: 44px;
  padding: 0;
  background: transparent;
  border: none;
  cursor: pointer;
  z-index: 1002;
}

.mobile-toggle span {
  display: block;
  width: 24px;
  height: 2px;
  background: var(--gray-700);
  border-radius: 2px;
  transition: transform 0.3s cubic-bezier(0.68, -0.55, 0.27, 1.55),
              opacity 0.2s ease,
              background-color 0.2s ease;
}

.mobile-toggle span:nth-child(1) {
  transform: translateY(-6px);
}

.mobile-toggle span:nth-child(2) {
  transform: translateY(0);
}

.mobile-toggle span:nth-child(3) {
  transform: translateY(6px);
}

/* Hamburger to X animation */
.mobile-toggle.active span:nth-child(1) {
  transform: translateY(0) rotate(45deg);
}

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

.mobile-toggle.active span:nth-child(3) {
  transform: translateY(0) rotate(-45deg);
}

/* Mobile nav backdrop */
.nav-backdrop {
  display: none;
  position: fixed;
  top: 0;
  left: 0;
  right: 0;
  bottom: 0;
  background: rgba(0, 0, 0, 0.5);
  backdrop-filter: blur(4px);
  -webkit-backdrop-filter: blur(4px);
  opacity: 0;
  visibility: hidden;
  transition: opacity 0.3s ease, visibility 0.3s ease;
  z-index: 999;
}

.nav-backdrop.visible {
  opacity: 1;
  visibility: visible;
}