.site-header {
  position: sticky;
  z-index: 100;
  top: 0;
  width: 100%;
  border-bottom: 1px solid rgba(151, 174, 235, 0.18);
  background: rgba(5, 11, 24, 0.82);
  box-shadow: 0 10px 36px rgba(0, 0, 0, 0.16);
  backdrop-filter: blur(16px);
}

.site-header__inner {
  display: flex;
  min-height: 4.75rem;
  align-items: center;
  gap: var(--space-4);
}

.site-header__brand {
  display: inline-flex;
  min-width: 0;
  flex: 0 1 auto;
  align-items: center;
  gap: 0.625rem;
  color: var(--color-text-primary);
  font-family: var(--font-heading);
  font-size: 1.125rem;
  font-weight: 700;
  line-height: 1.15;
  text-decoration: none;
  white-space: nowrap;
}

.site-header__brand:hover {
  color: var(--color-text-primary);
  text-shadow: 0 0 16px rgba(102, 199, 242, 0.18);
}

.site-header__logo {
  width: 2.5rem;
  height: 2.5rem;
  flex: 0 0 2.5rem;
  object-fit: contain;
}

.site-header__brand-text {
  overflow: hidden;
  text-overflow: ellipsis;
}

.site-header__nav {
  min-width: 0;
  flex: 1 1 auto;
}

.site-header__nav-list,
.site-header__mobile-links {
  display: flex;
  min-width: 0;
  align-items: center;
  gap: 0.25rem;
  margin: 0;
  padding: 0;
  list-style: none;
}

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

.site-header__nav-link,
.site-header__search,
.site-header__contact {
  display: inline-flex;
  min-height: 2.75rem;
  align-items: center;
  justify-content: center;
  padding: 0.625rem 0.625rem;
  border: 1px solid transparent;
  border-radius: var(--radius-md);
  color: var(--color-text-secondary);
  font-size: 0.8125rem;
  font-weight: 600;
  line-height: 1.2;
  text-decoration: none;
  white-space: nowrap;
  transition: color var(--transition-fast), border-color var(--transition-fast), background-color var(--transition-fast), box-shadow var(--transition-fast);
}

.site-header__nav-link:hover,
.site-header__search:hover,
.site-header__contact:hover {
  border-color: rgba(151, 174, 235, 0.3);
  background: rgba(20, 42, 82, 0.55);
  color: var(--color-text-primary);
  text-shadow: none;
}

.site-header__nav-link[aria-current="page"] {
  border-color: rgba(102, 199, 242, 0.48);
  background: rgba(102, 199, 242, 0.1);
  color: var(--color-text-primary);
}

.site-header__actions {
  display: flex;
  flex: 0 0 auto;
  align-items: center;
  gap: 0.25rem;
}

.site-header__search {
  gap: 0.375rem;
}

.site-header__search svg {
  width: 1.125rem;
  height: 1.125rem;
  flex: 0 0 auto;
}

.site-header__contact {
  border-color: var(--color-border-glass);
  color: var(--color-text-primary);
}

.site-header__toggle,
.site-header__mobile-links {
  display: none;
}

.site-header__toggle {
  width: 2.75rem;
  min-width: 2.75rem;
  height: 2.75rem;
  min-height: 2.75rem;
  flex-direction: column;
  gap: 0.25rem;
  padding: 0;
  border-color: var(--color-border-glass);
  background: var(--color-glass-navy);
  color: var(--color-text-primary);
}

.site-header__toggle:hover {
  background: var(--color-glass-navy-strong);
  color: var(--color-text-primary);
}

.site-header__toggle-line {
  display: block;
  width: 1.125rem;
  height: 2px;
  border-radius: 999px;
  background: currentColor;
  transition: transform var(--transition-fast), opacity var(--transition-fast);
}

.site-header__toggle[aria-expanded="true"] .site-header__toggle-line:nth-child(1) {
  transform: translateY(0.375rem) 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(-0.375rem) rotate(-45deg);
}

@media (max-width: 71.99rem) {
  .site-header__inner {
    position: relative;
    min-height: 4.25rem;
    justify-content: space-between;
  }

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

  .site-header__brand {
    font-size: 1rem;
  }

  .site-header__actions {
    margin-left: auto;
  }

  .site-header__contact {
    display: none;
  }

  .site-header__search span {
    display: none;
  }

  .site-header__search {
    width: 2.75rem;
    padding: 0;
  }

  .site-header__toggle {
    display: inline-flex;
  }

  .site-header__nav {
    position: absolute;
    top: calc(100% + 0.5rem);
    right: 0;
    left: 0;
    display: none;
    max-height: min(70vh, 34rem);
    overflow: auto;
    border: var(--border-active);
    border-radius: var(--radius-lg);
    background: var(--color-glass-navy-strong);
    box-shadow: var(--shadow-panel), var(--shadow-glow-violet);
    backdrop-filter: blur(18px);
  }

  .site-header__nav.is-open {
    display: block;
  }

  .site-header__nav-list,
  .site-header__mobile-links {
    display: grid;
    gap: 0.25rem;
    padding: var(--space-3);
  }

  .site-header__mobile-links {
    padding-top: 0;
    border-top: 1px solid rgba(151, 174, 235, 0.18);
  }

  .site-header__nav-link {
    justify-content: flex-start;
    min-height: 2.75rem;
    padding-inline: var(--space-3);
  }

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

@media (max-width: 29.99rem) {
  .site-header__inner {
    gap: 0.5rem;
  }

  .site-header__brand {
    gap: 0.5rem;
  }

  .site-header__brand-text {
    max-width: 10rem;
  }
}

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