.site-header {
  position: relative;
  z-index: 100;
  background-color: var(--color-paper);
  border-bottom: 1px solid var(--color-ink-soft);
}

.site-header__inner {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: var(--space-md);
  width: 100%;
  max-width: var(--container-main);
  margin-inline: auto;
  padding-inline: var(--gutter-mobile);
  min-height: 64px;
}

.site-header__brand {
  display: inline-flex;
  align-items: center;
  gap: var(--space-sm);
  text-decoration: none;
  color: var(--color-ink);
  min-width: 0;
  flex-shrink: 1;
}

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

.site-header__logo {
  display: block;
  width: auto;
  height: 40px;
  max-width: 160px;
  object-fit: contain;
  flex-shrink: 0;
}

.site-header__brand-text {
  font-family: var(--font-heading);
  font-size: 1.125rem;
  font-weight: 600;
  line-height: 1.2;
  letter-spacing: -0.01em;
  white-space: nowrap;
  overflow: hidden;
  text-overflow: ellipsis;
}

.site-header__toggle {
  display: inline-flex;
  flex-direction: column;
  justify-content: center;
  align-items: center;
  gap: 5px;
  width: 44px;
  height: 44px;
  padding: 0;
  background: none;
  border: 1px solid var(--color-ink-soft);
  border-radius: var(--radius-md);
  cursor: pointer;
  transition: background-color 150ms ease-out, border-color 150ms ease-out;
  flex-shrink: 0;
}

.site-header__toggle:hover {
  background-color: var(--color-paper-deep);
  border-color: var(--color-slate);
}

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

.site-header__toggle-line {
  display: block;
  width: 20px;
  height: 2px;
  background-color: var(--color-ink);
  transition: transform 200ms ease-out, opacity 200ms ease-out;
}

.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__nav {
  display: none;
  position: absolute;
  top: 100%;
  left: 0;
  right: 0;
  background-color: var(--color-paper);
  border-bottom: 1px solid var(--color-ink-soft);
  box-shadow: var(--shadow-elevated);
  max-height: calc(100vh - 64px);
  overflow-y: auto;
  padding: var(--space-md) var(--gutter-mobile);
}

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

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

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

.site-header__nav-link {
  display: block;
  padding: var(--space-xs) var(--space-sm);
  border-radius: var(--radius-md);
  color: var(--color-ink);
  text-decoration: none;
  font-weight: 500;
  line-height: 1.4;
  transition: background-color 150ms ease-out, color 150ms ease-out;
}

.site-header__nav-link:hover {
  background-color: var(--color-paper-deep);
  color: var(--color-slate);
}

.site-header__nav-link:focus-visible {
  outline: 2px solid var(--color-slate);
  outline-offset: 2px;
}

@media (min-width: 768px) {
  .site-header__inner {
    padding-inline: var(--gutter-tablet);
  }

  .site-header__logo {
    height: 36px;
  }

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

@media (min-width: 1024px) {
  .site-header__inner {
    padding-inline: var(--gutter-desktop);
    min-height: 72px;
  }

  .site-header__logo {
    height: 40px;
  }

  .site-header__toggle {
    display: none;
  }

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

  .site-header__nav-list {
    flex-direction: row;
    align-items: center;
    gap: var(--space-sm);
  }

  .site-header__nav-link {
    padding: var(--space-xs) var(--space-sm);
    white-space: nowrap;
  }
}

@media (min-width: 1280px) {
  .site-header__nav-list {
    gap: var(--space-md);
  }
}