.site-header {
  position: relative;
  z-index: 1000;
  background-color: var(--color-paper);
  border-bottom: var(--border-thin);
  padding-block: var(--space-sm);
}

.site-header__inner {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: var(--space-md);
  min-height: 3.5rem;
}

.site-header__brand {
  display: inline-flex;
  align-items: center;
  gap: var(--space-sm);
  flex-shrink: 0;
  min-width: 0;
  color: var(--color-ink);
  text-decoration: none;
  transition: color var(--transition-fast);
}

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

.site-header__logo {
  width: 3rem;
  height: 3rem;
  object-fit: contain;
  flex-shrink: 0;
}

.site-header__brand-text {
  font-family: var(--font-heading);
  font-size: 1.25rem;
  font-weight: 700;
  line-height: 1.2;
  white-space: nowrap;
}

.site-header__toggle {
  display: none;
  flex-direction: column;
  justify-content: center;
  align-items: center;
  gap: 5px;
  width: 2.75rem;
  height: 2.75rem;
  padding: 0;
  background: transparent;
  border: 1px solid transparent;
  border-radius: var(--radius-sm);
  cursor: pointer;
  transition: background-color var(--transition-fast), border-color var(--transition-fast);
  flex-shrink: 0;
}

.site-header__toggle:hover {
  background-color: rgba(var(--color-ink-rgb), 0.05);
}

.site-header__toggle:focus-visible {
  outline: none;
  box-shadow: var(--focus-ring);
  border-color: var(--color-mustard);
}

.site-header__toggle-line {
  display: block;
  width: 1.25rem;
  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);
}

.site-nav {
  display: flex;
  align-items: center;
  flex-shrink: 1;
  min-width: 0;
}

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

.site-nav__item {
  margin: 0;
  padding: 0;
  flex-shrink: 0;
}

.site-nav__item + .site-nav__item {
  margin: 0;
}

.site-nav__link {
  display: inline-block;
  padding: var(--space-xs) 0;
  font-size: var(--text-small-size);
  font-weight: 600;
  line-height: 1.4;
  color: var(--color-ink);
  text-decoration: none;
  white-space: nowrap;
  position: relative;
  transition: color var(--transition-fast);
}

.site-nav__link::after {
  content: "";
  position: absolute;
  left: 0;
  bottom: 0;
  width: 100%;
  height: 2px;
  background-color: var(--color-mustard);
  transform: scaleX(0);
  transform-origin: left;
  transition: transform var(--transition-fast);
}

.site-nav__link:hover,
.site-nav__link:focus-visible {
  color: var(--color-mustard);
}

.site-nav__link:hover::after,
.site-nav__link:focus-visible::after,
.site-nav__link[aria-current="page"]::after {
  transform: scaleX(1);
}

.site-nav__link[aria-current="page"] {
  color: var(--color-mustard);
}

@media (max-width: 1023px) {
  .site-header__toggle {
    display: flex;
  }

  .site-nav {
    position: absolute;
    top: 100%;
    left: 0;
    right: 0;
    background-color: var(--color-paper);
    border-bottom: var(--border-thin);
    box-shadow: var(--shadow-card);
    max-height: 0;
    overflow: hidden;
    transition: max-height var(--transition-fast), visibility var(--transition-fast);
    visibility: hidden;
    display: block;
  }

  .site-nav.is-open {
    max-height: calc(100vh - 3.5rem);
    overflow-y: auto;
    visibility: visible;
  }

  .site-nav__list {
    flex-direction: column;
    align-items: stretch;
    gap: 0;
    padding: var(--space-sm) var(--container-pad-mobile);
  }

  .site-nav__item {
    flex-shrink: 1;
  }

  .site-nav__link {
    display: block;
    padding: var(--space-sm) 0;
    font-size: var(--text-body-size);
    border-bottom: 1px solid rgba(var(--color-ink-rgb), 0.05);
  }

  .site-nav__link::after {
    display: none;
  }

  .site-nav__link:hover,
  .site-nav__link:focus-visible {
    color: var(--color-mustard);
    background-color: rgba(var(--color-ink-rgb), 0.03);
  }
}

@media (min-width: 1024px) {
  .site-header__inner {
    min-height: 4rem;
  }

  .site-header__logo {
    width: 3rem;
    height: 3rem;
  }

  .site-header__brand-text {
    font-size: 1.5rem;
  }

  .site-nav__list {
    gap: var(--space-lg);
  }

  .site-nav__link {
    font-size: var(--text-body-size);
  }
}