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

.site-header__inner {
  display: flex;
  align-items: center;
  justify-content: space-between;
  min-height: 64px;
  padding-block: var(--space-8);
}

.site-header__brand {
  display: inline-flex;
  align-items: center;
  gap: var(--space-8);
  flex-shrink: 0;
  min-width: 0;
}

.site-header__logo {
  width: 32px;
  height: 32px;
  flex-shrink: 0;
  object-fit: contain;
}

.site-header__brand-text {
  display: flex;
  flex-direction: column;
  line-height: 1.1;
}

.site-header__brand-name {
  font-family: var(--font-mono);
  font-size: 14px;
  font-weight: 500;
  letter-spacing: 0.08em;
  text-transform: uppercase;
  color: var(--color-chalk);
  white-space: nowrap;
}

.site-header__brand-sub {
  font-family: var(--font-mono);
  font-size: 10px;
  font-weight: 400;
  letter-spacing: 0.08em;
  text-transform: uppercase;
  color: var(--color-concrete);
  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: transparent;
  border: 1px solid var(--color-iron);
  border-radius: var(--radius-default);
  cursor: pointer;
  transition: border-color var(--transition-fast), background-color var(--transition-fast);
}

.site-header__toggle:hover {
  border-color: var(--color-felt);
}

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

.site-header__toggle-line {
  display: block;
  width: 20px;
  height: 2px;
  background-color: var(--color-chalk);
  transition: background-color var(--transition-fast), 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-header__nav {
  display: flex;
  align-items: center;
  gap: var(--space-24);
  margin-left: auto;
}

.site-header__nav-list {
  display: flex;
  align-items: center;
  gap: var(--space-24);
  list-style: none;
  margin: 0;
  padding: 0;
}

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

.site-header__nav-link {
  display: inline-block;
  font-family: var(--font-mono);
  font-size: 12px;
  font-weight: 500;
  letter-spacing: 0.06em;
  text-transform: uppercase;
  color: var(--color-chalk);
  padding-block: var(--space-8);
  white-space: nowrap;
  transition: color var(--transition-fast);
}

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

.site-header__nav-link:focus-visible {
  outline: var(--border-focus);
  outline-offset: var(--focus-offset);
}

.site-header__cta {
  flex-shrink: 0;
}

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

  .site-header__nav {
    position: fixed;
    top: 64px;
    left: 0;
    right: 0;
    bottom: 0;
    flex-direction: column;
    align-items: stretch;
    gap: var(--space-24);
    background-color: var(--color-obsidian);
    padding: var(--space-24);
    overflow-y: auto;
    transform: translateX(100%);
    visibility: hidden;
    transition: transform 0.2s ease, visibility 0.2s ease;
    z-index: 999;
  }

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

  .site-header__nav-list {
    flex-direction: column;
    align-items: stretch;
    gap: var(--space-8);
  }

  .site-header__nav-link {
    display: block;
    padding: var(--space-12) var(--space-16);
    font-size: 14px;
    border-bottom: var(--border-hairline);
  }

  .site-header__cta {
    margin-top: auto;
    width: 100%;
  }
}

@media (min-width: 1024px) {
  .site-header__inner {
    min-height: 72px;
  }

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

  .site-header__brand-name {
    font-size: 14px;
  }

  .site-header__brand-sub {
    font-size: 10px;
  }

  .site-header__nav {
    gap: var(--space-32);
  }

  .site-header__nav-list {
    gap: var(--space-32);
  }

  .site-header__nav-link {
    font-size: 12px;
  }
}