.site-header {
  position: fixed;
  top: 0;
  left: 0;
  right: 0;
  z-index: var(--z-header);
  height: var(--header-h);
  background: rgba(255, 255, 255, 0.97);
  backdrop-filter: blur(8px);
  -webkit-backdrop-filter: blur(8px);
  border-bottom: 1px solid var(--c-border-light);
  transition: box-shadow var(--t-base);
}

.site-header--scrolled {
  box-shadow: var(--shadow-sm);
}

.site-header__inner {
  display: flex;
  align-items: center;
  height: 100%;
  max-width: var(--max-w);
  margin: 0 auto;
  padding: 0 var(--sp-6);
}

.site-header__logo {
  display: flex;
  align-items: center;
  flex-shrink: 0;
}

.site-header__logo-img {
  width: 152px;
  height: auto;
}

.site-header__nav {
  display: flex;
  align-items: center;
  margin-left: auto;
}

.site-header__nav-list {
  display: flex;
  align-items: center;
  gap: var(--sp-1);
}

.site-header__nav-item {
  position: relative;
}

.site-header__nav-link {
  display: flex;
  align-items: center;
  gap: 4px;
  padding: var(--sp-2) var(--sp-3);
  font-size: var(--fs-sm);
  font-weight: var(--fw-medium);
  color: var(--c-text-secondary);
  border-radius: var(--radius-sm);
  transition: color var(--t-fast), background var(--t-fast);
}

.site-header__nav-link:hover {
  color: var(--c-primary-700);
  background: var(--c-primary-50);
}

.site-header__nav-link--active {
  color: var(--c-primary-700);
  font-weight: var(--fw-semibold);
}

.site-header__dropdown {
  position: absolute;
  top: 100%;
  left: 0;
  min-width: 220px;
  background: var(--c-bg);
  border: 1px solid var(--c-border);
  border-radius: var(--radius-md);
  box-shadow: var(--shadow-lg);
  padding: var(--sp-2);
  opacity: 0;
  visibility: hidden;
  transform: translateY(8px);
  transition: all var(--t-fast);
  z-index: var(--z-dropdown);
}

.site-header__nav-item:hover .site-header__dropdown,
.site-header__nav-item:focus-within .site-header__dropdown {
  opacity: 1;
  visibility: visible;
  transform: translateY(0);
}

.site-header__dropdown-link {
  display: flex;
  align-items: center;
  gap: var(--sp-3);
  padding: var(--sp-2) var(--sp-3);
  font-size: var(--fs-sm);
  color: var(--c-text-secondary);
  border-radius: var(--radius-sm);
  transition: background var(--t-fast), color var(--t-fast);
}

.site-header__dropdown-link:hover {
  background: var(--c-primary-50);
  color: var(--c-primary-700);
}

.site-header__dropdown-icon {
  display: flex;
  align-items: center;
  justify-content: center;
  width: 32px;
  height: 32px;
  background: var(--c-bg-alt);
  border-radius: var(--radius-sm);
  color: var(--c-primary-500);
  flex-shrink: 0;
}

.site-header__cta {
  margin-left: var(--sp-4);
  flex-shrink: 0;
}

.site-header__toggle {
  display: none;
  flex-direction: column;
  gap: 5px;
  width: 28px;
  padding: var(--sp-2);
  margin-left: var(--sp-4);
  background: none;
  border: none;
  cursor: pointer;
}

.site-header__toggle-bar {
  display: block;
  width: 100%;
  height: 2px;
  background: var(--c-text);
  border-radius: 2px;
  transition: all var(--t-base);
}

.site-header__toggle[aria-expanded="true"] .site-header__toggle-bar:nth-child(1) {
  transform: rotate(45deg) translate(5px, 5px);
}

.site-header__toggle[aria-expanded="true"] .site-header__toggle-bar:nth-child(2) {
  opacity: 0;
}

.site-header__toggle[aria-expanded="true"] .site-header__toggle-bar:nth-child(3) {
  transform: rotate(-45deg) translate(5px, -5px);
}

.site-header__mobile-nav {
  display: none;
  position: fixed;
  top: 0;
  right: -100%;
  width: 300px;
  height: 100vh;
  background: var(--c-bg);
  padding: var(--sp-8) var(--sp-6);
  box-shadow: var(--shadow-xl);
  z-index: calc(var(--z-overlay) + 1);
  overflow-y: auto;
  transition: right var(--t-base);
}

.site-header__mobile-nav--open {
  right: 0;
}

.site-header__mobile-nav-close {
  display: flex;
  align-items: center;
  justify-content: center;
  width: 40px;
  height: 40px;
  margin-left: auto;
  margin-bottom: var(--sp-6);
  color: var(--c-text);
  border-radius: var(--radius-sm);
}

.site-header__mobile-nav-close:hover {
  background: var(--c-bg-alt);
}

.site-header__mobile-link {
  display: block;
  padding: var(--sp-3) 0;
  font-size: var(--fs-base);
  font-weight: var(--fw-medium);
  color: var(--c-text-secondary);
  border-bottom: 1px solid var(--c-border-light);
  transition: color var(--t-fast);
}

.site-header__mobile-link:hover {
  color: var(--c-primary-700);
}

.site-header__mobile-cta {
  margin-top: var(--sp-6);
}

.nav-overlay {
  display: none;
  position: fixed;
  inset: 0;
  background: rgba(0, 0, 0, 0.5);
  z-index: var(--z-overlay);
}

.nav-overlay--visible {
  display: block;
}

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

  .site-header__cta-desktop {
    display: none;
  }

  .site-header__toggle {
    display: flex;
  }

  .site-header__mobile-nav {
    display: block;
  }
}