.site-header {
  position: relative;
  z-index: 100;
  width: 100%;
  border-bottom: 1px solid var(--color-line);
  background: var(--color-canvas);
}

.site-header__inner {
  position: relative;
  display: grid;
  min-height: 5.5rem;
  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-content: center;
  gap: 0.625rem;
  color: var(--color-ink);
  text-decoration: none;
  white-space: nowrap;
}

.site-header__brand:hover { color: var(--color-amethyst-deep); }
.site-header__logo { width: 2.375rem; height: 2.375rem; object-fit: contain; }
.site-header__brand-text { font-family: var(--font-heading); font-size: 0.9375rem; font-weight: 600; letter-spacing: -0.01em; }

.site-header__desktop-nav { min-width: 0; }
.site-header__desktop-nav--left { justify-self: start; }
.site-header__desktop-nav--right { justify-self: end; }
.site-header__nav-list,
.site-header__mobile-list {
  display: flex;
  align-items: center;
  gap: clamp(0.75rem, 1.8vw, 1.5rem);
  margin: 0;
  padding: 0;
  list-style: none;
}
.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-ink);
  font-size: 0.75rem;
  font-weight: 650;
  letter-spacing: 0.1em;
  line-height: 1.2;
  text-decoration: none;
  text-transform: uppercase;
  white-space: nowrap;
}
.site-header__nav-list a:hover { color: var(--color-amethyst-deep); text-decoration: underline; text-underline-offset: 0.28em; }

.site-header__toggle { display: none; }
.site-header__mobile-nav { display: none; }

@media (max-width: 899px) {
  .site-header__inner { min-height: 4.75rem; grid-template-columns: 1fr auto 1fr; }
  .site-header__desktop-nav { display: none; }
  .site-header__brand { grid-column: 2; }
  .site-header__logo { width: 2rem; height: 2rem; }
  .site-header__brand-text { font-size: 0.875rem; }
  .site-header__toggle {
    display: inline-flex;
    width: 2.75rem;
    height: 2.75rem;
    grid-column: 3;
    justify-self: end;
    flex-direction: column;
    align-items: center;
    justify-content: center;
    gap: 0.3rem;
    border: 1px solid var(--color-line);
    border-radius: var(--radius-lg);
    background: var(--color-canvas);
  }
  .site-header__toggle-line { width: 1.125rem; height: 1px; background: var(--color-ink); transition: transform var(--transition-fast), opacity var(--transition-fast); }
  .site-header__toggle[aria-expanded="true"] .site-header__toggle-line:nth-child(1) { transform: translateY(0.4rem) 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(-0.4rem) rotate(-45deg); }
  .site-header__mobile-nav {
    position: absolute;
    z-index: 101;
    top: calc(100% + 1px);
    right: 0;
    left: 0;
    display: block;
    max-height: calc(100vh - 4.75rem);
    overflow-y: auto;
    border-bottom: 1px solid var(--color-line);
    background: var(--color-canvas);
    box-shadow: var(--shadow-raised);
  }
  .site-header__mobile-nav[hidden] { display: none !important; }
  .site-header__mobile-nav-inner { display: flex; flex-direction: column; gap: var(--space-5); width: min(100% - (var(--page-gutter) * 2), 36rem); margin: 0 auto; padding: var(--space-6) 0 var(--space-7); }
  .site-header__mobile-label { margin: 0; color: var(--color-amethyst-deep); font-size: var(--text-label); font-weight: 650; letter-spacing: var(--tracking-label); line-height: var(--leading-label); text-transform: uppercase; }
  .site-header__mobile-list { flex-direction: column; align-items: stretch; gap: 0; }
  .site-header__mobile-list a { display: flex; min-height: 2.75rem; align-items: center; padding-block: var(--space-2); border-bottom: 1px solid var(--color-line); color: var(--color-ink); font-family: var(--font-heading); font-size: 1.5rem; line-height: 1.1; text-decoration: none; }
  .site-header__mobile-list a:hover { color: var(--color-amethyst-deep); }
  .site-header__mobile-action { align-self: flex-start; }
}

@media (prefers-reduced-motion: no-preference) {
  .site-header__mobile-nav { animation: site-header-menu-in var(--transition-base); }
  @keyframes site-header-menu-in { from { opacity: 0; transform: translateY(-0.5rem); } to { opacity: 1; transform: translateY(0); } }
}