/* Header component styles */
.site-header {
  position: relative;
  background-color: var(--color-paper);
  padding-block-end: var(--space-base);
  border-block-end: var(--border-double);
}

.site-header__masthead {
  text-align: center;
  padding-block-start: var(--space-base);
  padding-block-end: var(--space-tight);
}

.site-header__tagline {
  font-family: var(--font-body);
  font-size: 0.75rem;
  letter-spacing: 0.1em;
  text-transform: uppercase;
  color: var(--color-ink-light);
  margin: 0 0 var(--space-tight);
}

.site-header__brand-row {
  display: flex;
  justify-content: center;
  align-items: center;
  margin-block-end: var(--space-tight);
}

.site-header__brand {
  display: inline-flex;
  align-items: center;
  gap: var(--space-tight);
  text-decoration: none;
  color: var(--color-ink);
}

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

.site-header__logo {
  width: 48px;
  height: 48px;
  object-fit: contain;
  border: none;
  padding: 0;
  background: transparent;
}

.site-header__brand-text {
  font-family: var(--font-heading);
  font-size: 1.5rem;
  font-weight: 700;
  letter-spacing: -0.02em;
  line-height: 1.2;
}

.site-header__double-rule {
  border-block-start: var(--border-double);
  margin-block-start: var(--space-tight);
}

.site-header__nav {
  position: relative;
  border-block-start: var(--border-single);
  border-block-end: var(--border-single);
  background-color: var(--color-paper);
}

.site-header__toggle {
  display: none;
  align-items: center;
  gap: var(--space-tight);
  padding: var(--space-tight) var(--space-base);
  background: transparent;
  border: none;
  border-radius: 0;
  color: var(--color-ink);
  font-family: var(--font-body);
  font-size: 0.875rem;
  letter-spacing: 0.05em;
  text-transform: uppercase;
  cursor: pointer;
  transition: background-color var(--transition-fast), color var(--transition-fast);
}

.site-header__toggle:hover {
  background-color: var(--color-paper-dark);
  color: var(--color-ink);
}

.site-header__toggle:focus-visible {
  outline: var(--focus-outline);
  outline-offset: var(--focus-offset);
}

.site-header__toggle[aria-expanded="true"] {
  background-color: var(--color-paper-dark);
}

.site-header__toggle-icon {
  display: inline-flex;
  flex-direction: column;
  justify-content: center;
  width: 20px;
  height: 14px;
}

.site-header__toggle-icon span {
  display: block;
  width: 100%;
  height: 2px;
  background-color: currentColor;
  margin-block: 2px;
  transition: transform var(--transition-fast), opacity var(--transition-fast);
}

.site-header__toggle[aria-expanded="true"] .site-header__toggle-icon span:nth-child(1) {
  transform: translateY(6px) rotate(45deg);
}

.site-header__toggle[aria-expanded="true"] .site-header__toggle-icon span:nth-child(2) {
  opacity: 0;
}

.site-header__toggle[aria-expanded="true"] .site-header__toggle-icon span:nth-child(3) {
  transform: translateY(-6px) rotate(-45deg);
}

.site-header__toggle-label {
  display: inline;
}

.site-header__menu {
  display: block;
}

.site-header__list {
  display: flex;
  flex-wrap: nowrap;
  justify-content: center;
  align-items: center;
  list-style: none;
  margin: 0;
  padding: 0;
  gap: var(--space-base);
}

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

.site-header__item + .site-header__item::before {
  content: "";
  position: absolute;
  inset-inline-start: calc(-1 * var(--space-base) / 2);
  top: 50%;
  transform: translateY(-50%);
  height: 1em;
  width: 1px;
  background-color: var(--color-rule);
}

.site-header__link {
  display: inline-block;
  padding: var(--space-tight) var(--space-base);
  font-family: var(--font-body);
  font-size: 0.875rem;
  letter-spacing: 0.05em;
  text-transform: uppercase;
  color: var(--color-ink);
  text-decoration: none;
  transition: color var(--transition-fast), background-color var(--transition-fast);
}

.site-header__link:hover {
  color: var(--color-accent-dark);
  background-color: var(--color-paper-dark);
}

.site-header__link:focus-visible {
  outline: var(--focus-outline);
  outline-offset: var(--focus-offset);
}

.site-header__link[aria-current="page"] {
  color: var(--color-accent);
  text-decoration: underline;
  text-decoration-color: var(--color-accent);
  text-underline-offset: 4px;
}

@media (max-width: 899px) {
  .site-header__toggle {
    display: flex;
    width: 100%;
    justify-content: flex-start;
  }

  .site-header__menu {
    display: none;
    position: absolute;
    top: 100%;
    left: 0;
    right: 0;
    background-color: var(--color-paper);
    border-block-end: var(--border-double);
    z-index: 1000;
    max-height: calc(100vh - 100px);
    overflow-y: auto;
  }

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

  .site-header__list {
    flex-direction: column;
    align-items: stretch;
    gap: 0;
  }

  .site-header__item + .site-header__item::before {
    display: none;
  }

  .site-header__link {
    display: block;
    padding: var(--space-base);
    border-block-end: var(--border-single);
    text-align: start;
  }

  .site-header__link:last-child {
    border-block-end: none;
  }
}

@media (max-width: 479px) {
  .site-header__logo {
    width: 36px;
    height: 36px;
  }

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