/* ============================================
   Site Header — Sticky frosted-glass navigation
   ============================================ */

.site-header {
  position: fixed;
  top: 0;
  left: 0;
  right: 0;
  z-index: var(--z-sticky);
  height: var(--header-height);
  background: var(--header-bg);
  backdrop-filter: saturate(180%) blur(20px);
  -webkit-backdrop-filter: saturate(180%) blur(20px);
  transition: background var(--transition-base), box-shadow var(--transition-base);
}

.site-header .container {
  height: 100%;
}

/* Scrolled state — more opaque + subtle shadow */
.site-header.is-scrolled {
  background: var(--header-bg-scrolled);
  box-shadow: 0 1px 0 rgba(0, 0, 0, 0.08);
}

/* Logo */
.site-header__logo {
  display: flex;
  align-items: center;
  font-size: var(--text-lg);
  font-weight: var(--weight-bold);
  color: var(--color-heading);
  text-decoration: none;
  letter-spacing: var(--tracking-tight);
  flex-shrink: 0;
}

.site-header__logo:hover {
  color: var(--color-heading);
}

/* ============================================
   Desktop Navigation
   ============================================ */

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

.nav__list {
  display: flex;
  align-items: center;
  gap: var(--space-xs);
  list-style: none;
  margin: 0;
  padding: 0;
}

.nav__link {
  display: inline-flex;
  align-items: center;
  gap: 0.25rem;
  padding: 0.5rem 0.875rem;
  font-size: var(--text-sm);
  font-weight: var(--weight-medium);
  color: var(--color-heading);
  text-decoration: none;
  border-radius: var(--radius-full);
  transition: background var(--transition-fast), color var(--transition-fast);
  white-space: nowrap;
}

.nav__link:hover {
  background: rgba(0, 0, 0, 0.04);
  color: var(--color-heading);
}

.nav__link svg {
  width: 14px;
  height: 14px;
  opacity: 0.5;
  transition: transform var(--transition-fast);
}

/* Active state */
.is-active > .nav__link {
  color: var(--color-accent);
}

/* ============================================
   Dropdown
   ============================================ */

.has-dropdown {
  position: relative;
}

.nav__dropdown {
  position: absolute;
  top: 100%;
  left: 50%;
  transform: translateX(-50%) translateY(4px);
  min-width: 200px;
  background: var(--color-white);
  border-radius: var(--radius-md);
  box-shadow: 0 4px 24px rgba(0, 0, 0, 0.12);
  padding: var(--space-xs) 0;
  list-style: none;
  opacity: 0;
  visibility: hidden;
  transition: opacity var(--transition-fast), transform var(--transition-fast), visibility var(--transition-fast);
  pointer-events: none;
}

.has-dropdown.is-open > .nav__link svg {
  transform: rotate(180deg);
}

.has-dropdown.is-open > .nav__dropdown {
  opacity: 1;
  visibility: visible;
  transform: translateX(-50%) translateY(0);
  pointer-events: auto;
}

.nav__dropdown .nav__link {
  display: block;
  padding: 0.5rem 1.25rem;
  font-size: var(--text-sm);
  border-radius: 0;
}

.nav__dropdown .nav__link:hover {
  background: var(--color-bg-alt);
}

/* ============================================
   Header Actions (CTA + Mobile Toggle)
   ============================================ */

.site-header__actions {
  display: flex;
  align-items: center;
  gap: var(--space-sm);
  flex-shrink: 0;
}

.nav__toggle {
  display: none;
  align-items: center;
  justify-content: center;
  width: 40px;
  height: 40px;
  padding: 0;
  background: none;
  border: none;
  border-radius: var(--radius-sm);
  color: var(--color-heading);
  cursor: pointer;
  transition: background var(--transition-fast);
}

.nav__toggle:hover {
  background: rgba(0, 0, 0, 0.04);
}

.nav__toggle svg {
  width: 24px;
  height: 24px;
}

/* ============================================
   Mobile Navigation Overlay
   ============================================ */

.mobile-nav {
  position: fixed;
  top: 0;
  right: 0;
  bottom: 0;
  width: 100%;
  max-width: 400px;
  z-index: var(--z-modal);
  background: var(--color-white);
  display: flex;
  flex-direction: column;
  transform: translateX(100%);
  transition: transform var(--transition-spring);
  box-shadow: -8px 0 30px rgba(0, 0, 0, 0.15);
}

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

/* Backdrop */
.mobile-nav::before {
  content: '';
  position: fixed;
  inset: 0;
  background: rgba(0, 0, 0, 0.4);
  opacity: 0;
  transition: opacity var(--transition-base);
  pointer-events: none;
  z-index: -1;
}

.mobile-nav.is-open::before {
  opacity: 1;
}

/* Mobile nav header */
.mobile-nav__header {
  display: flex;
  align-items: center;
  justify-content: space-between;
  padding: var(--space-md) var(--space-lg);
  border-bottom: 1px solid var(--color-border-light);
  flex-shrink: 0;
}

.mobile-nav__logo {
  font-size: var(--text-lg);
  font-weight: var(--weight-bold);
  color: var(--color-heading);
  text-decoration: none;
}

.mobile-nav__close {
  display: flex;
  align-items: center;
  justify-content: center;
  width: 40px;
  height: 40px;
  padding: 0;
  background: none;
  border: none;
  border-radius: var(--radius-sm);
  color: var(--color-heading);
  cursor: pointer;
  transition: background var(--transition-fast);
}

.mobile-nav__close:hover {
  background: var(--color-bg-alt);
}

.mobile-nav__close svg {
  width: 24px;
  height: 24px;
}

/* Mobile nav body */
.mobile-nav__body {
  flex: 1;
  overflow-y: auto;
  padding: var(--space-md) 0;
}

.mobile-nav__list {
  list-style: none;
  margin: 0;
  padding: 0;
}

.mobile-nav__list li {
  border-bottom: 1px solid var(--color-border-light);
}

.mobile-nav__list a {
  display: block;
  padding: var(--space-md) var(--space-lg);
  font-size: var(--text-lg);
  font-weight: var(--weight-medium);
  color: var(--color-heading);
  text-decoration: none;
  transition: background var(--transition-fast), color var(--transition-fast);
}

.mobile-nav__list a:hover {
  background: var(--color-bg-alt);
  color: var(--color-accent);
}

.mobile-nav__list .current-menu-item > a {
  color: var(--color-accent);
}

/* Mobile nav sub-menu */
.mobile-nav__list .sub-menu {
  list-style: none;
  padding: 0;
  margin: 0;
  background: var(--color-bg-alt);
}

.mobile-nav__list .sub-menu a {
  padding-left: var(--space-2xl);
  font-size: var(--text-base);
  font-weight: var(--weight-regular);
}

/* Mobile nav footer */
.mobile-nav__footer {
  padding: var(--space-lg);
  border-top: 1px solid var(--color-border-light);
  display: flex;
  flex-direction: column;
  gap: var(--space-sm);
  flex-shrink: 0;
}

.mobile-nav__phone,
.mobile-nav__email {
  display: flex;
  align-items: center;
  gap: var(--space-sm);
  font-size: var(--text-sm);
  color: var(--color-body);
  text-decoration: none;
}

.mobile-nav__phone:hover,
.mobile-nav__email:hover {
  color: var(--color-accent);
}

.mobile-nav__phone svg,
.mobile-nav__email svg {
  flex-shrink: 0;
}

/* ============================================
   Responsive — Switch to mobile at 900px
   ============================================ */

@media (max-width: 900px) {
  .nav {
    display: none;
  }

  .site-header__actions .btn {
    display: none;
  }

  .nav__toggle {
    display: flex;
  }
}

/* Body offset for fixed header */
body {
  padding-top: var(--header-height);
}