.site-header {
  position: sticky;
  z-index: 900;
  top: 0;
  width: 100%;
  border-bottom: 1px solid var(--color-border);
  background: rgba(247, 249, 248, 0.92);
}

@supports (backdrop-filter: blur(1px)) {
  .site-header {
    backdrop-filter: blur(18px) saturate(115%);
  }
}

.site-header__inner {
  position: relative;
  display: flex;
  min-height: 4.5rem;
  align-items: center;
  gap: var(--space-3);
}

.site-header__brand {
  display: inline-flex;
  min-width: 0;
  flex: 1 1 auto;
  align-items: center;
  gap: 0.625rem;
  color: var(--color-ink-950);
  text-decoration: none;
}

.site-header__brand:hover {
  color: var(--color-ink-950);
}

.site-header__logo {
  width: 2.125rem;
  height: 2.125rem;
  flex: 0 0 2.125rem;
  object-fit: contain;
}

.site-header__brand-text {
  max-width: 8.25rem;
  overflow: hidden;
  font-family: var(--font-heading);
  font-size: 1.45rem;
  font-weight: 700;
  letter-spacing: -0.02em;
  line-height: 0.95;
  text-overflow: ellipsis;
  white-space: nowrap;
}

.site-header__controls {
  display: flex;
  flex: 0 0 auto;
  align-items: center;
  gap: var(--space-2);
}

.site-header__request {
  min-height: 2.75rem;
  padding-inline: 0.75rem;
  font-size: 0.75rem;
  white-space: nowrap;
}

.site-header__toggle {
  display: inline-flex;
  width: var(--touch-target);
  min-width: var(--touch-target);
  min-height: var(--touch-target);
  flex-direction: column;
  align-items: center;
  justify-content: center;
  gap: 0.25rem;
  border: 1px solid var(--color-border-strong);
  border-radius: var(--radius-md);
  background: var(--color-frost-000);
  color: var(--color-ink-950);
}

.site-header__toggle-line {
  display: block;
  width: 1.125rem;
  height: 2px;
  border-radius: 1px;
  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);
}

.site-header__nav {
  position: absolute;
  z-index: 1;
  top: calc(100% + 0.5rem);
  right: var(--page-padding);
  left: var(--page-padding);
  display: none;
  max-height: calc(100vh - 5.5rem);
  overflow-y: auto;
  border: 1px solid var(--color-border);
  border-radius: var(--radius-lg);
  background: var(--color-frost-000);
  box-shadow: var(--shadow-card);
}

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

.site-header__nav-list,
.site-header__nav-list li,
.site-header__nav-list li + li {
  margin: 0;
  padding: 0;
  list-style: none;
}

.site-header__nav-list {
  display: grid;
  gap: 0;
  padding: var(--space-2);
}

.site-header__nav-list a {
  display: flex;
  min-height: var(--touch-target);
  align-items: center;
  border-radius: var(--radius-md);
  padding: 0.625rem var(--space-3);
  color: var(--color-ink-950);
  font-size: var(--text-14);
  font-weight: 700;
  line-height: 1.2;
  text-decoration: none;
}

.site-header__nav-list a:hover,
.site-header__nav-list a[aria-current="page"] {
  background: rgba(18, 185, 199, 0.1);
  color: var(--color-violet-600);
}

@media (min-width: 70rem) {
  .site-header__inner {
    min-height: 4.875rem;
    gap: var(--space-4);
  }

  .site-header__brand {
    flex: 0 0 auto;
  }

  .site-header__logo {
    width: 2.625rem;
    height: 2.625rem;
    flex-basis: 2.625rem;
  }

  .site-header__brand-text {
    max-width: 10.625rem;
    font-size: 1.7rem;
  }

  .site-header__controls {
    order: 3;
  }

  .site-header__request {
    padding-inline: var(--space-3);
    font-size: var(--text-14);
  }

  .site-header__toggle {
    display: none;
  }

  .site-header__nav {
    position: static;
    display: block;
    min-width: 0;
    max-height: none;
    flex: 1 1 auto;
    overflow: visible;
    border: 0;
    border-radius: 0;
    background: transparent;
    box-shadow: none;
  }

  .site-header__nav-list {
    display: flex;
    justify-content: flex-end;
    gap: 0.125rem;
    padding: 0;
  }

  .site-header__nav-list a {
    min-height: 2.75rem;
    padding-inline: 0.5rem;
    font-size: 0.75rem;
    white-space: nowrap;
  }

  .site-header__nav-mobile-link {
    display: none;
  }
}

@media (min-width: 80rem) {
  .site-header__nav-list {
    gap: var(--space-1);
  }

  .site-header__nav-list a {
    padding-inline: 0.625rem;
    font-size: var(--text-14);
  }
}

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