.site-header {
  position: fixed;
  top: 0;
  left: 0;
  width: 100%;
  z-index: 1000;
  background-color: transparent;
  transition: background-color var(--transition-fast), box-shadow var(--transition-fast);
}

.site-header.is-scrolled {
  background-color: var(--color-midnight-navy);
  box-shadow: 0 2px 8px rgba(10, 10, 10, 0.2);
}

.site-header__inner {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: var(--space-md);
  max-width: var(--container-wide);
  margin-inline: auto;
  padding: var(--space-sm) var(--page-padding-mobile);
  min-height: 64px;
}

.site-header__brand {
  display: inline-flex;
  align-items: center;
  gap: var(--space-sm);
  flex-shrink: 0;
  color: var(--color-warm-ivory);
  text-decoration: none;
}

.site-header__logo {
  width: 44px;
  height: 44px;
  object-fit: contain;
  flex-shrink: 0;
}

.site-header__wordmark {
  font-family: var(--font-heading);
  font-size: 1.25rem;
  font-weight: 700;
  letter-spacing: 0.01em;
  color: var(--color-warm-ivory);
  white-space: nowrap;
}

.site-header__toggle {
  display: inline-flex;
  flex-direction: column;
  align-items: center;
  justify-content: center;
  gap: 5px;
  width: 44px;
  height: 44px;
  padding: 0;
  background: none;
  border: none;
  cursor: pointer;
  flex-shrink: 0;
}

.site-header__toggle-line {
  display: block;
  width: 22px;
  height: 2px;
  background-color: var(--color-warm-ivory);
  transition: transform var(--transition-fast), opacity var(--transition-fast);
}

.site-header__toggle[aria-expanded="true"] .site-header__toggle-line:nth-child(1) {
  transform: translateY(7px) 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(-7px) rotate(-45deg);
}

.site-header__toggle:focus-visible {
  outline: none;
  box-shadow: 0 0 0 var(--focus-ring-offset) var(--color-midnight-navy), 0 0 0 calc(var(--focus-ring-offset) + 2px) var(--color-champagne-gold);
}

.site-header__nav {
  display: none;
  position: absolute;
  top: 100%;
  left: 0;
  width: 100%;
  max-height: calc(100vh - 64px);
  overflow-y: auto;
  background-color: var(--color-midnight-navy);
  padding: var(--space-md) var(--page-padding-mobile) var(--space-lg);
  box-shadow: 0 12px 32px rgba(10, 10, 10, 0.18);
}

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

.site-header__list {
  list-style: none;
  margin: 0;
  padding: 0;
  display: flex;
  flex-direction: column;
  gap: var(--space-sm);
}

.site-header__item {
  margin: 0;
  padding: 0;
}

.site-header__link {
  display: block;
  padding: var(--space-sm) var(--space-md);
  font-family: var(--font-body);
  font-size: var(--text-body-large-size);
  font-weight: 500;
  color: var(--color-warm-ivory);
  text-decoration: none;
  border-radius: var(--radius-2);
  transition: color var(--transition-fast), background-color var(--transition-fast);
}

.site-header__link:hover,
.site-header__link:focus-visible {
  color: var(--color-champagne-gold);
  background-color: rgba(198, 161, 91, 0.08);
}

.site-header__link:focus-visible {
  outline: none;
  box-shadow: 0 0 0 var(--focus-ring-offset) var(--color-midnight-navy), 0 0 0 calc(var(--focus-ring-offset) + 2px) var(--color-champagne-gold);
}

@media (min-width: 48rem) {
  .site-header__inner {
    padding-inline: var(--page-padding-tablet);
    min-height: 72px;
  }

  .site-header__logo {
    width: 44px;
    height: 44px;
  }

  .site-header__wordmark {
    font-size: 1.25rem;
  }
}

@media (min-width: 75rem) {
  .site-header__inner {
    padding-inline: var(--page-padding-desktop);
    min-height: 80px;
  }

  .site-header__toggle {
    display: none;
  }

  .site-header__nav {
    display: block;
    position: static;
    width: auto;
    max-height: none;
    overflow: visible;
    background: none;
    padding: 0;
    box-shadow: none;
  }

  .site-header__list {
    flex-direction: row;
    align-items: center;
    gap: var(--space-lg);
  }

  .site-header__link {
    display: flex;
    padding: var(--space-xs) var(--space-sm);
    font-size: var(--text-body-size);
    font-weight: 500;
    white-space: nowrap;
  }

  .site-header__link:hover,
  .site-header__link:focus-visible {
    background: none;
    color: var(--color-champagne-gold);
  }
}

@media (max-width: 74.999rem) {
  .site-header__nav {
    display: none;
  }

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

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

  .site-header__toggle-line {
    transition: none;
  }

  .site-header__nav {
    transition: none;
  }
}