.site-header {
  position: fixed;
  top: 0;
  left: 0;
  right: 0;
  z-index: 1000;
  height: var(--header-height);
  background: var(--surface-glass-strong);
  backdrop-filter: blur(16px);
  -webkit-backdrop-filter: blur(16px);
  border-bottom: var(--border-subtle);
  box-shadow: var(--shadow-soft);
}

.site-header__inner {
  display: grid;
  grid-template-columns: 1fr auto 1fr;
  align-items: center;
  height: 100%;
  max-width: var(--container-max);
  margin-inline: auto;
  padding-inline: var(--container-padding);
  gap: var(--space-4);
}

.site-header__nav {
  display: flex;
  align-items: center;
  min-width: 0;
}

.site-header__nav--left {
  justify-content: flex-start;
}

.site-header__nav--right {
  justify-content: flex-end;
}

.site-header__list {
  display: flex;
  align-items: center;
  gap: var(--space-4);
  list-style: none;
  margin: 0;
  padding: 0;
}

.site-header__item {
  margin: 0;
  padding: 0;
}

.site-header__item + .site-header__item {
  margin: 0;
}

.site-header__link {
  display: inline-flex;
  align-items: center;
  font-family: var(--font-body);
  font-size: var(--text-small-size);
  line-height: 1;
  letter-spacing: var(--tracking-label);
  text-transform: uppercase;
  color: var(--color-platinum);
  text-decoration: none;
  white-space: nowrap;
  padding: var(--space-2) 0;
  position: relative;
  transition: color 0.25s ease, text-shadow 0.25s ease;
}

.site-header__link::after {
  content: '';
  position: absolute;
  left: 0;
  bottom: 0;
  width: 100%;
  height: 1px;
  background-color: var(--color-turquoise-flash);
  transform: scaleX(0);
  transform-origin: left;
  transition: transform 0.25s ease;
}

.site-header__link:hover {
  color: var(--color-turquoise-flash);
  text-shadow: 0 0 16px rgba(64, 224, 208, 0.35);
}

.site-header__link:hover::after {
  transform: scaleX(1);
}

.site-header__link:focus-visible {
  outline: var(--focus-ring);
  outline-offset: var(--focus-offset);
  border-radius: var(--radius-sm);
}

.site-header__brand {
  display: inline-flex;
  align-items: center;
  gap: var(--space-2);
  text-decoration: none;
  color: var(--color-platinum);
  min-width: 0;
}

.site-header__logo {
  width: 40px;
  height: 40px;
  object-fit: contain;
  flex-shrink: 0;
}

.site-header__brand-text {
  font-family: var(--font-heading);
  font-size: var(--text-h3-size);
  line-height: 1;
  font-weight: 300;
  letter-spacing: -0.01em;
  white-space: nowrap;
}

.site-header__toggle {
  display: none;
  flex-direction: column;
  justify-content: center;
  align-items: center;
  gap: 5px;
  width: 44px;
  height: 44px;
  padding: 0;
  background: transparent;
  border: none;
  cursor: pointer;
  border-radius: var(--radius-sm);
  transition: background-color 0.25s ease;
}

.site-header__toggle:hover {
  background-color: rgba(255, 255, 255, 0.05);
}

.site-header__toggle:focus-visible {
  outline: var(--focus-ring);
  outline-offset: var(--focus-offset);
}

.site-header__toggle-line {
  display: block;
  width: 24px;
  height: 2px;
  background-color: var(--color-platinum);
  border-radius: 1px;
  transition: transform 0.25s ease, opacity 0.25s ease;
}

.site-header__toggle[aria-expanded="true"] .site-header__toggle-line:nth-child(1) {
  transform: translateY(7px) rotate(45deg);
}

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

.site-header__toggle[aria-expanded="true"] .site-header__toggle-line:nth-child(3) {
  transform: translateY(-7px) rotate(-45deg);
}

.site-header__mobile-menu {
  display: block;
  position: absolute;
  top: 100%;
  left: 0;
  right: 0;
  height: calc(100vh - var(--header-height));
  height: calc(100dvh - var(--header-height));
  z-index: 999;
  background: linear-gradient(180deg, rgba(30, 30, 47, 0.98), rgba(10, 10, 10, 0.98));
  backdrop-filter: blur(20px);
  -webkit-backdrop-filter: blur(20px);
  overflow-y: auto;
  overscroll-behavior: contain;
  -webkit-overflow-scrolling: touch;
  padding: var(--space-4) var(--container-padding) max(var(--space-4), env(safe-area-inset-bottom));
  border-top: var(--border-subtle);
  opacity: 0;
  visibility: hidden;
  pointer-events: none;
  transform: translateY(-0.75rem);
  transition:
    opacity 0.24s ease,
    transform 0.24s ease,
    visibility 0s linear 0.24s;
}

.site-header__mobile-menu.is-open {
  opacity: 1;
  visibility: visible;
  pointer-events: auto;
  transform: translateY(0);
  transition-delay: 0s;
}

html.site-menu-open,
html.site-menu-open body {
  overflow: hidden;
}

.site-header__mobile-nav {
  max-width: var(--container-max);
  margin-inline: auto;
}

.site-header__mobile-list {
  list-style: none;
  margin: 0;
  padding: 0;
  display: flex;
  flex-direction: column;
  gap: var(--space-3);
}

.site-header__mobile-item {
  margin: 0;
  padding: 0;
}

.site-header__mobile-link {
  display: block;
  font-family: var(--font-body);
  font-size: var(--text-h3-size);
  line-height: 1.2;
  letter-spacing: var(--tracking-label);
  color: var(--color-platinum);
  text-decoration: none;
  padding: var(--space-2) 0;
  transition: color 0.25s ease, text-shadow 0.25s ease;
}

.site-header__mobile-link:hover {
  color: var(--color-turquoise-flash);
  text-shadow: 0 0 16px rgba(64, 224, 208, 0.35);
}

.site-header__mobile-link:focus-visible {
  outline: var(--focus-ring);
  outline-offset: var(--focus-offset);
  border-radius: var(--radius-sm);
}

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

  .site-header__inner {
    grid-template-columns: auto 1fr auto;
  }

  .site-header__brand {
    justify-self: center;
  }

  .site-header__toggle {
    display: flex;
    justify-self: end;
  }
}

@media (max-width: 768px) {
  .site-header__brand-text {
    display: none;
  }

  .site-header__logo {
    width: 32px;
    height: 32px;
  }
}

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