.site-header {
  position: sticky;
  top: 0;
  z-index: 1000;
  background-color: var(--color-cream);
  border-bottom: 1px solid var(--color-line);
  transition: box-shadow var(--transition-fast), background-color var(--transition-fast);
}

.site-header[data-scrolled="true"] {
  box-shadow: var(--shadow-soft);
}

.site-header__inner {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: var(--space-md);
  max-width: var(--container-standard);
  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);
  text-decoration: none;
  color: var(--color-ink);
  flex-shrink: 0;
  min-width: 0;
}

.site-header__logo {
  width: 36px;
  height: 36px;
  object-fit: contain;
  display: block;
}

.site-header__brand-text {
  font-family: var(--font-heading);
  font-size: 1.125rem;
  font-weight: 600;
  letter-spacing: -0.01em;
  white-space: nowrap;
}

.site-header__nav {
  display: none;
  flex: 1 1 auto;
  justify-content: flex-end;
}

.site-header__nav-list {
  display: flex;
  align-items: center;
  gap: var(--space-lg);
  list-style: none;
  margin: 0;
  padding: 0;
}

.site-header__nav-item {
  margin: 0;
  padding: 0;
}

.site-header__nav-link {
  display: inline-flex;
  align-items: center;
  min-height: 44px;
  padding: 0;
  font-family: var(--font-body);
  font-size: 0.9375rem;
  font-weight: 500;
  color: var(--color-ink);
  text-decoration: none;
  white-space: nowrap;
  transition: color var(--transition-fast);
}

.site-header__nav-link:hover {
  color: var(--color-accent);
}

.site-header__nav-link[aria-current="page"] {
  color: var(--color-accent);
  box-shadow: inset 0 -2px 0 0 var(--color-accent);
}

.site-header__toggle {
  display: inline-flex;
  flex-direction: column;
  align-items: center;
  justify-content: center;
  gap: 5px;
  width: 44px;
  height: 44px;
  padding: 0;
  background: transparent;
  border: 1px solid var(--color-line);
  border-radius: var(--radius-default);
  cursor: pointer;
  flex-shrink: 0;
  transition: background-color var(--transition-fast), border-color var(--transition-fast);
}

.site-header__toggle:hover {
  background-color: var(--color-accent-soft);
  border-color: var(--color-accent);
}

.site-header__toggle:focus-visible {
  outline: 2px solid var(--color-accent);
  outline-offset: 2px;
}

.site-header__toggle-line {
  display: block;
  width: 20px;
  height: 2px;
  background-color: var(--color-ink);
  border-radius: 1px;
  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);
}

@media (min-width: 640px) {
  .site-header__inner {
    padding-inline: var(--page-padding-tablet);
  }

  .site-header__logo {
    width: 32px;
    height: 32px;
  }

  .site-header__brand-text {
    font-size: 1.25rem;
  }
}

@media (min-width: 900px) {
  .site-header__nav {
    display: flex;
  }

  .site-header__toggle {
    display: none;
  }
}

@media (max-width: 899px) {
  .site-header__nav {
    position: fixed;
    top: 64px;
    left: 0;
    right: 0;
    bottom: 0;
    z-index: 999;
    display: flex;
    flex-direction: column;
    justify-content: flex-start;
    align-items: stretch;
    background-color: var(--color-cream);
    border-top: 1px solid var(--color-line);
    padding: var(--space-lg) var(--page-padding-mobile);
    overflow-y: auto;
    transform: translateX(100%);
    visibility: hidden;
    transition: transform var(--transition-fast), visibility var(--transition-fast);
  }

  .site-header__nav.is-open {
    transform: translateX(0);
    visibility: visible;
  }

  .site-header__nav-list {
    flex-direction: column;
    align-items: stretch;
    gap: var(--space-xs);
  }

  .site-header__nav-link {
    display: flex;
    align-items: center;
    min-height: 48px;
    padding: var(--space-xs) var(--space-sm);
    font-family: var(--font-heading);
    font-size: 1.25rem;
    font-weight: 600;
    border-radius: var(--radius-default);
  }

  .site-header__nav-link:hover {
    background-color: var(--color-accent-soft);
  }

  .site-header__nav-link[aria-current="page"] {
    box-shadow: none;
    background-color: var(--color-accent-soft);
  }
}

@media (min-width: 1024px) {
  .site-header__inner {
    padding-inline: var(--page-padding-desktop);
  }
}

@media (prefers-reduced-motion: reduce) {
  .site-header,
  .site-header__toggle,
  .site-header__toggle-line,
  .site-header__nav {
    transition-duration: 0.01ms !important;
  }
}