.site-header {
  position: sticky;
  z-index: 100;
  top: 0;
  min-height: 4.5rem;
  border-bottom: 1px solid var(--color-line);
  background: var(--color-ink-900);
}

.site-header__inner {
  display: flex;
  min-height: 4.5rem;
  align-items: center;
  gap: var(--space-4);
}

.site-header__brand {
  display: inline-flex;
  min-width: 0;
  flex: 0 1 auto;
  align-items: center;
  gap: var(--space-3);
  color: var(--color-paper);
  text-decoration: none;
}

.site-header__logo {
  width: 2.5rem;
  height: 2.5rem;
  flex: 0 0 2.5rem;
  object-fit: contain;
}

.site-header__brand-copy {
  display: grid;
  min-width: 0;
  gap: 0.1rem;
  line-height: 1;
}

.site-header__brand-name {
  overflow: hidden;
  color: var(--color-paper);
  font-family: var(--font-heading);
  font-size: 1.35rem;
  font-weight: 700;
  letter-spacing: 0.02em;
  text-overflow: ellipsis;
  white-space: nowrap;
}

.site-header__brand-tagline {
  color: var(--color-paper-muted);
  font-size: 0.6875rem;
  font-weight: 600;
  letter-spacing: 0.05em;
  line-height: 1.2;
  text-transform: uppercase;
  white-space: nowrap;
}

.site-header__navigation {
  display: flex;
  min-width: 0;
  flex: 1 1 auto;
  align-items: center;
  justify-content: flex-end;
  gap: var(--space-4);
}

.site-header__nav-list {
  display: flex;
  min-width: 0;
  align-items: center;
  gap: 0.2rem;
  margin: 0;
  padding: 0;
  list-style: none;
}

.site-header__nav-list li,
.site-header__nav-list li + li {
  margin: 0;
  padding: 0;
}

.site-header__nav-link {
  display: inline-flex;
  min-height: 2.75rem;
  align-items: center;
  padding: 0 var(--space-2);
  border-bottom: 2px solid transparent;
  color: var(--color-paper-muted);
  font-size: 0.8125rem;
  font-weight: 700;
  line-height: 1.2;
  text-align: center;
  text-decoration: none;
  white-space: nowrap;
  transition: color var(--transition-fast), background-color var(--transition-fast), border-color var(--transition-fast);
}

.site-header__nav-link:hover,
.site-header__nav-link[aria-current="page"] {
  color: var(--color-paper);
}

.site-header__nav-link[aria-current="page"] {
  border-bottom-color: var(--color-ember);
  background: var(--color-ink-800);
}

.site-header__cta {
  display: inline-flex;
  min-height: 2.75rem;
  flex: 0 0 auto;
  align-items: center;
  gap: var(--space-2);
  padding: 0.625rem var(--space-3);
  border: 1px solid var(--color-ember);
  border-radius: var(--radius-md);
  background: var(--color-ember);
  color: var(--color-ember-ink);
  font-size: 0.75rem;
  font-weight: 700;
  line-height: 1.2;
  text-decoration: none;
  transition: background-color var(--transition-fast), transform var(--transition-fast);
  white-space: nowrap;
}

.site-header__cta:hover {
  background: var(--color-ember-hover);
  color: var(--color-ember-ink);
  transform: translateY(-1px);
}

.site-header__cta svg {
  width: 1.125rem;
  height: 1.125rem;
  flex: 0 0 auto;
}

.site-header__cta-short,
.site-header__nav-link--mobile-only,
.site-header__toggle {
  display: none;
}

@media (max-width: 1060px) {
  .site-header__inner {
    gap: var(--space-3);
  }

  .site-header__brand {
    margin-right: auto;
  }

  .site-header__toggle {
    display: inline-flex;
    width: 2.75rem;
    height: 2.75rem;
    flex: 0 0 2.75rem;
    flex-direction: column;
    align-items: center;
    justify-content: center;
    gap: 0.28rem;
    padding: 0;
    border: 1px solid var(--color-line);
    border-radius: var(--radius-md);
    background: var(--color-ink-800);
    color: var(--color-paper);
  }

  .site-header__toggle-line {
    display: block;
    width: 1.125rem;
    height: 2px;
    border-radius: 2px;
    background: currentColor;
    transition: transform var(--transition-fast), opacity var(--transition-fast);
  }

  .site-header__toggle[aria-expanded="true"] .site-header__toggle-line:nth-child(1) {
    transform: translateY(0.39rem) 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(-0.39rem) rotate(-45deg);
  }

  .site-header__navigation {
    position: absolute;
    top: calc(100% + 1px);
    right: max(var(--container-padding), calc((100vw - var(--container-main)) / 2 + var(--container-padding)));
    left: max(var(--container-padding), calc((100vw - var(--container-main)) / 2 + var(--container-padding)));
    display: none;
    height: calc(100dvh - 4.5rem);
    max-height: calc(100dvh - 4.5rem);
    overflow-y: auto;
    padding: var(--space-4) var(--space-3);
    border: 1px solid var(--color-line);
    border-radius: 0 0 var(--radius-md) var(--radius-md);
    background: var(--color-ink-900);
    box-shadow: var(--shadow-panel);
  }

  .site-header__navigation.is-open {
    display: flex;
    flex-direction: column;
    align-items: stretch;
    gap: var(--space-4);
  }

  .site-header__nav-list {
    display: flex;
    flex: 1 1 auto;
    flex-direction: column;
    align-items: center;
    justify-content: flex-start;
    gap: 0.35rem;
    width: 100%;
    min-height: 0;
  }

  .site-header__nav-list li {
    width: 100%;
  }

  .site-header__nav-link {
    width: 100%;
    min-height: 2.75rem;
    justify-content: center;
    padding-inline: var(--space-3);
    border-bottom: 0;
    border-left: 2px solid transparent;
    border-right: 2px solid transparent;
    text-align: center;
  }

  .site-header__nav-link[aria-current="page"] {
    border-bottom-color: transparent;
    border-left-color: transparent;
    border-right-color: transparent;
    box-shadow: inset 0 -2px 0 var(--color-ember);
  }

  .site-header__nav-link--mobile-only {
    display: inline-flex;
  }

  .site-header__cta {
    width: 100%;
    flex: 0 0 auto;
    justify-content: center;
    margin-top: auto;
  }
}

@media (max-width: 699px) {
  .site-header,
  .site-header__inner {
    min-height: 3.75rem;
  }

  .site-header__logo {
    width: 2.125rem;
    height: 2.125rem;
    flex-basis: 2.125rem;
  }

  .site-header__brand {
    gap: var(--space-2);
  }

  .site-header__brand-name {
    font-size: 1.125rem;
  }

  .site-header__brand-tagline {
    display: none;
  }

  .site-header__navigation {
    right: var(--container-padding);
    left: var(--container-padding);
    height: calc(100dvh - 3.75rem);
    max-height: calc(100dvh - 3.75rem);
  }

  .site-header__cta-full {
    display: none;
  }

  .site-header__cta-short {
    display: inline;
  }
}