.site-header {
  position: sticky;
  z-index: 100;
  top: 0;
  width: 100%;
  min-width: 0;
  border-bottom: 1px solid rgba(184, 207, 232, 0.16);
  background: rgba(11, 20, 36, 0.78);
  box-shadow: 0 12px 40px rgba(0, 0, 0, 0.18);
  backdrop-filter: blur(20px);
  -webkit-backdrop-filter: blur(20px);
}

.site-header__shell {
  position: relative;
  display: grid;
  min-height: 4.75rem;
  grid-template-columns: minmax(0, 1fr) auto minmax(0, 1fr);
  align-items: center;
  gap: var(--space-4);
}

.site-header__brand {
  display: inline-flex;
  min-width: 0;
  align-items: center;
  justify-self: center;
  gap: 0.625rem;
  color: var(--color-ice-100);
  text-decoration: none;
}

.site-header__logo {
  width: 2.5rem;
  height: 2.5rem;
  object-fit: contain;
}

.site-header__brand-name {
  font-family: var(--font-heading);
  font-size: 1.25rem;
  font-weight: 600;
  letter-spacing: 0.08em;
  line-height: 1;
  white-space: nowrap;
}

.site-header__desktop-nav {
  min-width: 0;
}

.site-header__desktop-nav--right {
  justify-self: end;
}

.site-header__nav-list,
.site-header__mobile-list {
  display: flex;
  min-width: 0;
  margin: 0;
  padding: 0;
  list-style: none;
}

.site-header__nav-list {
  align-items: center;
  gap: clamp(0.75rem, 2vw, 1.5rem);
}

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

.site-header__nav-list li,
.site-header__mobile-list li,
.site-header__nav-list li + li,
.site-header__mobile-list li + li {
  margin: 0;
  padding: 0;
}

.site-header__nav-list a {
  display: inline-flex;
  min-height: 2.75rem;
  align-items: center;
  color: var(--color-ice-300);
  font-size: 0.8125rem;
  font-weight: 700;
  letter-spacing: 0.04em;
  line-height: 1.2;
  text-decoration: none;
  white-space: nowrap;
  transition: color var(--transition-fast), text-shadow var(--transition-fast);
}

.site-header__nav-list a:hover,
.site-header__nav-list a[aria-current="page"] {
  color: var(--color-ice-100);
  text-shadow: 0 0 18px rgba(167, 165, 255, 0.5);
}

.site-header__inquiry-link {
  padding: 0.625rem 0.875rem;
  border: 1px solid var(--surface-border);
  border-radius: var(--radius-md);
  background: rgba(18, 42, 68, 0.42);
}

.site-header__toggle {
  display: none;
  width: 2.75rem;
  height: 2.75rem;
  align-items: center;
  justify-content: center;
  justify-self: end;
  gap: 0.3rem;
  padding: 0;
  border: 1px solid var(--surface-border);
  border-radius: var(--radius-md);
  background: rgba(18, 42, 68, 0.54);
  color: var(--color-ice-100);
  flex-direction: column;
}

.site-header__toggle-line {
  display: block;
  width: 1.25rem;
  height: 2px;
  border-radius: 2px;
  background: currentColor;
  transform-origin: center;
  transition: transform var(--transition-fast), opacity var(--transition-fast);
}

.site-header__toggle[aria-expanded="true"] .site-header__toggle-line:nth-child(1) {
  transform: translateY(0.5rem) 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(-0.5rem) rotate(-45deg);
}

.site-header__mobile-nav {
  position: fixed;
  z-index: 99;
  top: 4.75rem;
  right: 0;
  left: 0;
  display: grid;
  max-height: calc(100dvh - 4.75rem);
  overflow: hidden auto;
  border-bottom: 1px solid var(--surface-border);
  background: rgba(11, 20, 36, 0.95);
  box-shadow: var(--shadow-deep);
  opacity: 0;
  pointer-events: none;
  transform: translateY(-0.75rem);
  transition: opacity var(--transition-base), transform var(--transition-base);
  visibility: hidden;
  backdrop-filter: blur(24px);
  -webkit-backdrop-filter: blur(24px);
}

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

.site-header__mobile-nav-inner {
  display: flex;
  width: min(100% - 2rem, 34rem);
  min-width: 0;
  margin: 0 auto;
  padding: var(--space-6) 0 calc(var(--space-6) + env(safe-area-inset-bottom));
  flex-direction: column;
  gap: var(--space-5);
}

.site-header__mobile-label {
  margin: 0;
  color: var(--color-violet-glow);
  font-size: var(--text-meta);
  font-weight: 700;
  letter-spacing: 0.08em;
  line-height: var(--leading-meta);
}

.site-header__mobile-list {
  flex-direction: column;
  gap: var(--space-1);
}

.site-header__mobile-list a {
  display: flex;
  min-height: 2.75rem;
  align-items: center;
  padding: var(--space-2) 0;
  border-bottom: 1px solid rgba(184, 207, 232, 0.14);
  color: var(--color-ice-100);
  font-size: 1rem;
  font-weight: 600;
  text-decoration: none;
}

.site-header__mobile-list a:hover,
.site-header__mobile-list a[aria-current="page"] {
  color: var(--color-violet-glow);
}

.site-header__mobile-cta {
  align-self: flex-start;
}

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

@media (max-width: 65rem) {
  .site-header__shell {
    min-height: 4.5rem;
  }

  .site-header__logo {
    width: 2.25rem;
    height: 2.25rem;
  }

  .site-header__brand-name {
    font-size: 1.125rem;
  }

  .site-header__nav-list {
    gap: 0.75rem;
  }

  .site-header__nav-list a {
    font-size: 0.75rem;
  }
}

@media (max-width: 47.5rem) {
  .site-header__shell {
    min-height: 4.25rem;
    grid-template-columns: 2.75rem minmax(0, 1fr) 2.75rem;
  }

  .site-header__desktop-nav {
    display: none;
  }

  .site-header__brand {
    grid-column: 2;
  }

  .site-header__logo {
    width: 2rem;
    height: 2rem;
  }

  .site-header__brand-name {
    font-size: 1.0625rem;
  }

  .site-header__toggle {
    display: inline-flex;
    grid-column: 3;
  }

  .site-header__mobile-nav {
    top: 4.25rem;
    max-height: calc(100dvh - 4.25rem);
  }
}

@media (prefers-reduced-motion: reduce) {
  .site-header__toggle-line,
  .site-header__mobile-nav {
    transition-duration: 0.01ms;
  }
}