.site-header {
  position: sticky;
  top: 0;
  z-index: 1000;
  background-color: var(--color-khaki-base);
  border-bottom: var(--border-thick);
}

.site-header__inner {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: var(--space-3);
  min-height: 72px;
  padding-block: var(--space-2);
}

.site-header__brand {
  display: inline-flex;
  align-items: center;
  gap: var(--space-2);
  flex-shrink: 0;
  min-width: 0;
}

.site-header__logo {
  width: 48px;
  height: 48px;
  object-fit: contain;
  flex-shrink: 0;
}

.site-header__brand-text {
  font-family: var(--font-heading);
  font-size: 1.25rem;
  line-height: 1.2;
  text-transform: uppercase;
  letter-spacing: 0.02em;
  color: var(--color-ink-black);
  white-space: nowrap;
}

.site-header__toggle {
  display: none;
  flex-direction: column;
  justify-content: center;
  align-items: center;
  gap: 5px;
  width: 44px;
  height: 44px;
  padding: 0;
  background-color: var(--color-sunny-yellow);
  border: var(--border-thick);
  border-radius: var(--radius-none);
  cursor: pointer;
  transition: background-color var(--transition-fast), transform var(--transition-fast);
  flex-shrink: 0;
}

.site-header__toggle:hover {
  background-color: var(--color-hot-pink);
}

.site-header__toggle:focus-visible {
  outline: var(--border-thick);
  outline-offset: 2px;
  outline-color: var(--color-hot-pink);
}

.site-header__toggle:active {
  transform: translateY(2px);
}

.site-header__toggle-line {
  display: block;
  width: 22px;
  height: 3px;
  background-color: var(--color-ink-black);
  transition: transform var(--transition-fast), opacity var(--transition-fast);
}

.site-header__toggle[aria-expanded="true"] .site-header__toggle-line:nth-child(1) {
  transform: translateY(8px) 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(-8px) rotate(-45deg);
}

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

.site-header__nav-list {
  display: flex;
  align-items: center;
  gap: var(--space-3);
  margin: 0;
  padding: 0;
  list-style: none;
  flex-wrap: nowrap;
}

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

.site-header__nav-link {
  display: inline-block;
  font-family: var(--font-heading);
  font-size: 0.875rem;
  line-height: 1.2;
  text-transform: uppercase;
  letter-spacing: 0.02em;
  color: var(--color-ink-black);
  padding: var(--space-2) var(--space-3);
  border: var(--border-thin);
  border-radius: var(--radius-none);
  background-color: transparent;
  transition: background-color var(--transition-fast), color var(--transition-fast), border-color var(--transition-fast);
  white-space: nowrap;
}

.site-header__nav-link:hover {
  background-color: var(--color-sunny-yellow);
  border-color: var(--color-ink-black);
}

.site-header__nav-link:focus-visible {
  outline: var(--border-thick);
  outline-offset: 2px;
  outline-color: var(--color-hot-pink);
}

@media (max-width: 900px) {
  .site-header__inner {
    flex-wrap: wrap;
    min-height: 64px;
  }

  .site-header__brand-text {
    font-size: 1rem;
  }

  .site-header__logo {
    width: 36px;
    height: 36px;
  }

  .site-header__toggle {
    display: flex;
    order: 2;
  }

  .site-header__nav {
    display: none;
    order: 3;
    width: 100%;
    flex-basis: 100%;
    background-color: var(--color-khaki-base);
    border-top: var(--border-thick);
    padding: var(--space-3);
    max-height: calc(100vh - 64px);
    overflow-y: auto;
  }

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

  .site-header__nav-list {
    flex-direction: column;
    align-items: stretch;
    gap: var(--space-2);
    width: 100%;
  }

  .site-header__nav-item {
    width: 100%;
  }

  .site-header__nav-link {
    display: block;
    width: 100%;
    padding: var(--space-3);
    font-size: 1rem;
    text-align: center;
  }
}

@media (max-width: 480px) {
  .site-header__brand-text {
    display: none;
  }

  .site-header__logo {
    width: 36px;
    height: 36px;
  }
}