/**
 * HEADER & NAVIGATION STYLES
 */
.site-header {
  position: fixed;
  top: 0;
  left: 0;
  width: 100%;
  height: var(--header-height);
  background-color: rgba(255, 255, 255, 0.95);
  backdrop-filter: blur(10px);
  -webkit-backdrop-filter: blur(10px);
  border-bottom: 1px solid var(--color-border);
  z-index: var(--z-header);
  transition: height var(--transition-normal), box-shadow var(--transition-normal), background-color var(--transition-normal);
}

.site-header.is-scrolled {
  height: var(--header-compact-height);
  box-shadow: 0 4px 20px -2px rgba(15, 23, 42, 0.08);
}

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

/* Brand / Logo */
.header-brand {
  display: flex;
  align-items: center;
  text-decoration: none;
  flex-shrink: 0;
}

.header-logo {
  height: 52px;
  width: auto;
  max-width: 180px;
  object-fit: contain;
  transition: transform var(--transition-fast), height var(--transition-fast);
}

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

/* Main Navigation Desktop */
.main-nav {
  display: flex;
  align-items: center;
}

.nav-list {
  display: flex;
  align-items: center;
  gap: var(--spacing-5);
}

.nav-item {
  position: relative;
}

.nav-link {
  font-size: var(--font-size-base);
  font-weight: 600;
  color: var(--color-text);
  padding: var(--spacing-2) var(--spacing-1);
  display: inline-flex;
  align-items: center;
  gap: 6px;
  position: relative;
  transition: color var(--transition-fast);
}

.nav-link:hover,
.nav-link:focus-visible,
.nav-item.is-active > .nav-link {
  color: var(--color-secondary);
}

.nav-item.is-active > .nav-link::after {
  content: "";
  position: absolute;
  bottom: -4px;
  left: 0;
  width: 100%;
  height: 3px;
  background-color: var(--color-accent);
  border-radius: var(--radius-full);
}

/* Dropdown Menu */
.dropdown-trigger svg {
  width: 14px;
  height: 14px;
  transition: transform var(--transition-fast);
}

.nav-item.has-dropdown:hover .dropdown-trigger svg,
.nav-item.has-dropdown:focus-within .dropdown-trigger svg {
  transform: rotate(180deg);
}

.dropdown-menu {
  position: absolute;
  top: 100%;
  left: -20px;
  min-width: 300px;
  background-color: var(--color-surface);
  border: 1px solid var(--color-border);
  border-radius: var(--radius-lg);
  box-shadow: var(--shadow-xl);
  padding: var(--spacing-3);
  display: none;
  flex-direction: column;
  gap: var(--spacing-1);
  z-index: var(--z-dropdown);
  animation: dropdownIn 0.2s cubic-bezier(0.16, 1, 0.3, 1);
}

@keyframes dropdownIn {
  from {
    opacity: 0;
    transform: translateY(8px);
  }
  to {
    opacity: 1;
    transform: translateY(0);
  }
}

.nav-item.has-dropdown:hover .dropdown-menu,
.nav-item.has-dropdown:focus-within .dropdown-menu,
.nav-item.has-dropdown.is-open .dropdown-menu {
  display: flex;
}

.dropdown-link {
  display: flex;
  align-items: flex-start;
  gap: var(--spacing-3);
  padding: var(--spacing-3) var(--spacing-4);
  border-radius: var(--radius-md);
  transition: background-color var(--transition-fast), transform var(--transition-fast);
}

.dropdown-link:hover {
  background-color: var(--color-secondary-bg);
}

.dropdown-link-icon {
  width: 32px;
  height: 32px;
  border-radius: var(--radius-sm);
  background-color: #E0F2FE;
  color: var(--color-secondary);
  display: flex;
  align-items: center;
  justify-content: center;
  flex-shrink: 0;
}

.dropdown-link-title {
  display: block;
  font-size: var(--font-size-sm);
  font-weight: 700;
  color: var(--color-primary);
  margin-bottom: 2px;
}

.dropdown-link-desc {
  display: block;
  font-size: var(--font-size-xs);
  color: var(--color-text-muted);
  line-height: 1.3;
}

/* Header Action Right */
.header-actions {
  display: flex;
  align-items: center;
  gap: var(--spacing-4);
}

.header-phone {
  display: inline-flex;
  align-items: center;
  gap: 8px;
  font-weight: 700;
  color: var(--color-primary);
  font-size: var(--font-size-sm);
  padding: 6px 12px;
  border-radius: var(--radius-full);
  background-color: var(--color-surface-alt);
  transition: background-color var(--transition-fast), color var(--transition-fast);
}

.header-phone:hover {
  background-color: #E0F2FE;
  color: var(--color-secondary);
}

.header-phone svg {
  width: 16px;
  height: 16px;
  color: var(--color-secondary);
}

/* Mobile Toggle */
.mobile-nav-toggle {
  display: none;
  background: none;
  border: none;
  padding: var(--spacing-2);
  color: var(--color-primary);
  cursor: pointer;
  z-index: calc(var(--z-header) + 1);
}

.mobile-nav-toggle svg {
  width: 28px;
  height: 28px;
}

/* Mobile Menu Backdrop & Drawer */
.mobile-nav-drawer {
  display: none;
}

@media (max-width: 1024px) {
  .main-nav {
    display: none;
  }

  .header-phone {
    display: none;
  }

  .mobile-nav-toggle {
    display: block;
  }

  /* Mobile Drawer */
  .mobile-nav-drawer {
    display: block;
    position: fixed;
    top: 0;
    right: -100%;
    width: 100%;
    max-width: 360px;
    height: 100vh;
    background-color: var(--color-surface);
    box-shadow: var(--shadow-xl);
    z-index: var(--z-header);
    transition: right 0.3s cubic-bezier(0.16, 1, 0.3, 1);
    overflow-y: auto;
    padding: var(--spacing-8) var(--spacing-6);
  }

  .mobile-nav-drawer.is-open {
    right: 0;
  }

  .mobile-backdrop {
    display: none;
    position: fixed;
    top: 0;
    left: 0;
    width: 100%;
    height: 100vh;
    background-color: rgba(15, 23, 42, 0.6);
    z-index: calc(var(--z-header) - 1);
  }

  .mobile-backdrop.is-open {
    display: block;
  }

  .mobile-nav-list {
    display: flex;
    flex-direction: column;
    gap: var(--spacing-2);
    margin-top: var(--spacing-8);
  }

  .mobile-nav-link {
    display: flex;
    align-items: center;
    justify-content: space-between;
    padding: var(--spacing-3) var(--spacing-2);
    font-size: var(--font-size-md);
    font-weight: 600;
    color: var(--color-text);
    border-bottom: 1px solid var(--color-border);
  }

  .mobile-submenu {
    padding-left: var(--spacing-4);
    display: none;
    flex-direction: column;
    gap: var(--spacing-2);
    margin-top: var(--spacing-2);
  }

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

  .mobile-submenu-link {
    font-size: var(--font-size-sm);
    color: var(--color-text-muted);
    padding: var(--spacing-2) 0;
  }

  .mobile-drawer-footer {
    margin-top: var(--spacing-8);
    display: flex;
    flex-direction: column;
    gap: var(--spacing-3);
  }
}