.site-header {
  position: relative;
  z-index: 100;
  border-bottom: 1px solid var(--color-line-dark);
  background: var(--color-emerald-950);
  color: var(--color-white-000);
}

.site-header__inner {
  display: flex;
  align-items: center;
  min-height: 5.25rem;
  gap: var(--space-4);
}

.site-header__brand {
  display: inline-flex;
  flex: 0 1 auto;
  align-items: center;
  min-width: 0;
  gap: 0.625rem;
  color: var(--color-white-000);
  text-decoration: none;
}

.site-header__brand:hover { color: var(--color-white-000); }

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

.site-header__brand-copy {
  display: grid;
  min-width: 0;
  gap: 0.0625rem;
  line-height: 1.15;
}

.site-header__brand-name {
  font-family: var(--font-heading);
  font-size: 1rem;
  font-weight: 700;
  letter-spacing: -0.025em;
  white-space: nowrap;
}

.site-header__brand-detail {
  color: var(--color-amber-500);
  font-size: var(--font-size-12);
  font-weight: 700;
  letter-spacing: 0.04em;
}

.site-header__navigation {
  display: flex;
  flex: 1 1 auto;
  align-items: center;
  justify-content: flex-end;
  min-width: 0;
  gap: clamp(0.75rem, 2vw, 1.5rem);
}

.site-header__nav-list {
  display: flex;
  align-items: center;
  min-width: 0;
  margin: 0;
  padding: 0;
  list-style: none;
  gap: clamp(0.75rem, 1.5vw, 1.25rem);
}

.site-header__nav-list li,
.site-header__nav-list li + li {
  display: flex;
  align-items: center;
  margin: 0;
  padding: 0;
}

.site-header__nav-list a {
  display: inline-flex;
  align-items: center;
  min-height: 2.75rem;
  color: var(--color-white-000);
  font-size: var(--font-size-14);
  font-weight: 700;
  line-height: 1.2;
  text-decoration: none;
  white-space: nowrap;
}

.site-header__nav-list a:hover,
.site-header__nav-list a[aria-current="page"] {
  color: var(--color-amber-500);
}

.site-header__action { flex: 0 0 auto; white-space: nowrap; }

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

@media (max-width: 1023px) {
  .site-header__inner { min-height: 4.75rem; justify-content: space-between; }

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

  .site-header__brand-name { font-size: 0.9375rem; }

  .site-header__toggle {
    display: inline-flex;
    flex: 0 0 2.75rem;
    align-items: center;
    justify-content: center;
    width: 2.75rem;
    height: 2.75rem;
    margin: 0;
    padding: 0;
    border: 1px solid var(--color-line-dark);
    border-radius: var(--radius-md);
    background: transparent;
    color: var(--color-white-000);
  }

  .site-header__toggle:hover { border-color: var(--color-amber-500); color: var(--color-amber-500); }

  .site-header__toggle-lines {
    display: grid;
    width: 1.25rem;
    gap: 0.25rem;
  }

  .site-header__toggle-lines span {
    display: block;
    height: 2px;
    background: currentColor;
    transform-origin: center;
    transition: transform var(--transition-fast), opacity var(--transition-fast);
  }

  .site-header__toggle[aria-expanded="true"] .site-header__toggle-lines span:nth-child(1) { transform: translateY(0.375rem) rotate(45deg); }
  .site-header__toggle[aria-expanded="true"] .site-header__toggle-lines span:nth-child(2) { opacity: 0; }
  .site-header__toggle[aria-expanded="true"] .site-header__toggle-lines span:nth-child(3) { transform: translateY(-0.375rem) rotate(-45deg); }

  .site-header__navigation {
    position: absolute;
    top: 100%;
    right: 0;
    left: 0;
    display: none;
    max-height: calc(100dvh - 4.75rem);
    padding: var(--space-6) max(var(--container-gutter), calc((100% - var(--container-max)) / 2));
    overflow-y: auto;
    border-bottom: 1px solid var(--color-line-dark);
    background: var(--color-emerald-900);
    box-shadow: var(--shadow-overlay);
  }

  .site-header__navigation.is-open { display: grid; gap: var(--space-4); }

  .site-header__nav-list {
    display: grid;
    gap: 0;
  }

  .site-header__nav-list li { border-bottom: 1px solid var(--color-line-dark); }
  .site-header__nav-list a { width: 100%; min-height: 3rem; font-size: var(--font-size-16); }
  .site-header__action { width: 100%; }

  .site-header__mobile-links {
    display: grid;
    padding-top: var(--space-2);
    border-top: 1px solid var(--color-line-dark);
    gap: 0;
  }

  .site-header__mobile-links a {
    padding-block: var(--space-3);
    color: var(--color-white-000);
    font-size: var(--font-size-14);
  }
}

@media (max-width: 419px) {
  .site-header__inner { gap: var(--space-2); }
  .site-header__brand { gap: var(--space-2); }
  .site-header__brand-detail { display: none; }
  .site-header__brand-name { font-size: 0.8125rem; white-space: normal; }
}

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