.site-header {
  position: sticky;
  top: 0;
  z-index: 100;
  background: rgba(255, 255, 255, 0.95);
  backdrop-filter: saturate(180%) blur(8px);
  -webkit-backdrop-filter: saturate(180%) blur(8px);
  border-bottom: 1px solid var(--gray-300);
  transition: transform 0.3s cubic-bezier(0.4, 0, 0.2, 1);
  will-change: transform;
}

.site-header--hidden {
  transform: translateY(-100%);
}

@media (prefers-reduced-motion: reduce) {
  .site-header { transition: none; }
}

.site-header__inner {
  display: flex;
  align-items: center;
  justify-content: space-between;
  padding: var(--space-4) 0;
}

.site-logo {
  font-family: var(--font-display);
  font-size: 1.5rem;
  font-weight: 500;
  color: var(--navy-deep);
  letter-spacing: 0.02em;
  display: inline-flex;
  align-items: center;
}

.site-logo em {
  font-style: italic;
  color: var(--navy);
}

.site-logo img {
  display: block;
  height: 36px;
  width: auto;
  max-width: 180px;
}

@media (min-width: 768px) {
  .site-logo img {
    height: 42px;
    max-width: 220px;
  }
}

.site-nav {
  display: none;
}

@media (min-width: 768px) {
  .site-nav {
    display: flex;
    align-items: center;
    gap: var(--space-5);
  }
}

@media (min-width: 1024px) {
  .site-nav {
    gap: var(--space-6);
  }
}

.site-nav a {
  font-size: 0.875rem;
  color: var(--charcoal);
  letter-spacing: 0.05em;
  font-weight: 400;
  position: relative;
  padding: var(--space-2) 0;
  transition: color var(--transition-base);
}

.site-nav a:hover,
.site-nav a.active {
  color: var(--navy-deep);
}

.site-nav a.active::after {
  content: "";
  position: absolute;
  bottom: 0;
  left: 0;
  right: 0;
  height: 1px;
  background: var(--navy);
}

.site-header__actions {
  display: flex;
  align-items: center;
  gap: var(--space-4);
}

.menu-toggle {
  display: flex;
  flex-direction: column;
  gap: 4px;
  padding: var(--space-2);
  position: relative;
  z-index: 120;
}

.menu-toggle span {
  display: block;
  width: 24px;
  height: 1.5px;
  background: var(--charcoal);
  transition: transform var(--transition-base), opacity var(--transition-base);
}

.menu-toggle.is-open span:nth-child(1) {
  transform: translateY(5.5px) rotate(45deg);
}

.menu-toggle.is-open span:nth-child(2) {
  opacity: 0;
}

.menu-toggle.is-open span:nth-child(3) {
  transform: translateY(-5.5px) rotate(-45deg);
}

@media (min-width: 768px) {
  .menu-toggle {
    display: none;
  }
}

.mobile-menu {
  position: fixed;
  inset: 0;
  z-index: 110;
  background: rgba(15, 15, 15, 0);
  visibility: hidden;
  transition: background 0.45s ease, visibility 0s linear 0.45s;
}

.mobile-menu.is-open {
  background: rgba(15, 15, 15, 0.65);
  visibility: visible;
  transition: background 0.45s ease, visibility 0s linear 0s;
}

.mobile-menu__panel {
  position: absolute;
  top: 0;
  left: 0;
  bottom: 0;
  width: min(86%, 360px);
  background: var(--white);
  padding: var(--space-5);
  transform: translateX(-100%);
  transition: transform 0.45s cubic-bezier(0.32, 0.72, 0, 1);
  overflow-y: auto;
  display: flex;
  flex-direction: column;
  box-shadow: 0 0 60px rgba(0, 0, 0, 0.15);
}

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

.mobile-menu__head {
  display: flex;
  align-items: center;
  justify-content: space-between;
  padding-bottom: var(--space-4);
  border-bottom: 1px solid var(--gray-300);
  margin-bottom: var(--space-4);
}

.mobile-menu__close {
  background: none;
  border: none;
  width: 36px;
  height: 36px;
  font-size: 24px;
  line-height: 1;
  color: var(--charcoal);
  cursor: pointer;
  padding: 0;
  transition: color var(--transition-base);
}

.mobile-menu__close:hover { color: var(--navy-deep); }

.mobile-nav {
  display: flex;
  flex-direction: column;
  flex: 1;
}

.mobile-nav > a,
.mobile-nav__group-toggle {
  font-family: var(--font-body);
  font-size: 13px;
  font-weight: 500;
  letter-spacing: 0.08em;
  color: var(--charcoal);
  text-transform: uppercase;
  padding: 14px 0;
  border-bottom: 1px solid var(--gray-300);
  text-align: left;
  background: none;
  width: 100%;
  border-left: none;
  border-right: none;
  border-top: none;
  display: flex;
  align-items: center;
  justify-content: space-between;
  cursor: pointer;
  transition: color var(--transition-base);
}

.mobile-nav > a.active,
.mobile-nav__group--has-active > .mobile-nav__group-toggle {
  color: var(--navy-deep);
}

.mobile-nav > a:hover,
.mobile-nav__group-toggle:hover {
  color: var(--navy);
}

.mobile-nav__chev {
  font-size: 14px;
  color: var(--gray-500);
  transition: transform 0.32s cubic-bezier(0.4, 0, 0.2, 1), color 0.2s ease;
  font-family: var(--font-display);
  line-height: 1;
  display: inline-block;
}

.mobile-nav__group[data-expanded="true"] .mobile-nav__chev {
  transform: rotate(180deg);
  color: var(--navy);
}

.mobile-nav__sub {
  display: flex;
  flex-direction: column;
  background: var(--gray-50);
  margin: 0 calc(-1 * var(--space-5));
  padding-left: calc(var(--space-5) + var(--space-4));
  padding-right: var(--space-5);
  max-height: 0;
  overflow: hidden;
  transition: max-height 0.32s cubic-bezier(0.4, 0, 0.2, 1);
}

.mobile-nav__group[data-expanded="true"] .mobile-nav__sub {
  max-height: 360px;
  border-bottom: 1px solid var(--gray-300);
}

.mobile-nav__sub a:first-child {
  padding-top: var(--space-3);
}

.mobile-nav__sub a:last-child {
  padding-bottom: var(--space-3);
}

@media (prefers-reduced-motion: reduce) {
  .mobile-menu__panel,
  .mobile-nav__sub,
  .mobile-nav__chev {
    transition: none;
  }
}

.mobile-nav__sub a {
  font-family: var(--font-body);
  font-size: 13px;
  font-weight: 400;
  color: var(--gray-700);
  padding: 10px 0;
  letter-spacing: 0.02em;
  transition: color var(--transition-base);
}

.mobile-nav__sub a:hover,
.mobile-nav__sub a.active {
  color: var(--navy-deep);
}

.mobile-menu__lang {
  margin-top: var(--space-5);
  padding-top: var(--space-5);
  border-top: 1px solid var(--gray-300);
  display: flex;
  align-items: center;
  gap: var(--space-2);
  font-family: var(--font-mono);
  font-size: 12px;
  letter-spacing: 0.1em;
}

.mobile-menu__lang .lang-btn {
  background: none;
  border: none;
  color: var(--gray-500);
  padding: 4px 8px;
  text-transform: uppercase;
  cursor: pointer;
  transition: color var(--transition-base);
  font-family: inherit;
  font-size: inherit;
  letter-spacing: inherit;
}

.mobile-menu__lang .lang-btn.active,
.mobile-menu__lang .lang-btn:hover {
  color: var(--navy-deep);
}

@media (max-width: 767px) {
  .site-header__actions .lang-switcher {
    display: none;
  }
}

@media (min-width: 768px) {
  .mobile-menu {
    display: none;
  }
}