.site-header {
  position: sticky;
  z-index: 100;
  top: 0;
  border-bottom: 1px solid rgb(185 184 209 / 52%);
  background: rgb(22 11 46 / 96%);
  box-shadow: 0 1px 0 rgb(255 255 255 / 8%);
  backdrop-filter: blur(12px);
}

.site-header__inner {
  display: flex;
  min-height: 4.75rem;
  align-items: center;
  gap: var(--space-4);
}

.site-header__brand {
  display: inline-flex;
  min-width: 0;
  align-items: center;
  gap: var(--space-2);
  color: var(--color-white);
  font-family: var(--font-heading);
  font-size: 1rem;
  font-weight: 700;
  line-height: 1.1;
  text-decoration: none;
  white-space: nowrap;
}

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

.site-header__mark {
  width: 2.75rem;
  height: 2.75rem;
  flex: 0 0 auto;
  object-fit: contain;
}

.site-header__brand-text {
  overflow: hidden;
  text-overflow: ellipsis;
}

.site-header__nav {
  display: flex;
  min-width: 0;
  flex: 1 1 auto;
  align-items: center;
  justify-content: flex-end;
  gap: var(--space-3);
}

.site-header__nav-top,
.site-header__toggle,
.site-header__close {
  display: none;
}

.site-header__nav-list {
  display: flex;
  min-width: 0;
  align-items: center;
  gap: clamp(0.5rem, 1.2vw, 1rem);
  margin: 0;
  padding: 0;
  list-style: none;
}

.site-header__nav-list li,
.site-header__nav-list li + li {
  display: flex;
  min-width: 0;
  align-items: center;
  margin: 0;
  padding: 0;
}

.site-header__nav-list a {
  display: inline-flex;
  min-height: 44px;
  align-items: center;
  border-bottom: 2px solid transparent;
  color: var(--color-lavender-100);
  font-size: 0.8125rem;
  font-weight: 600;
  line-height: 1.2;
  text-decoration: none;
  white-space: nowrap;
  transition: border-color var(--transition-fast), color var(--transition-fast);
}

.site-header__nav-list a:hover,
.site-header__nav-list a[aria-current="page"] {
  border-color: var(--color-turquoise-400);
  color: var(--color-white);
}

.site-header__nav-action {
  flex: 0 0 auto;
  min-height: 40px;
  padding: 0.5rem 0.75rem;
  font-size: 0.75rem;
  white-space: nowrap;
}

.site-header__nav-mobile-only {
  display: none !important;
}

@media (max-width: 1099px) {
  body.site-menu-open {
    overflow: hidden;
  }

  .site-header {
    z-index: 1000;
  }

  .site-header__inner {
    min-height: 4.25rem;
    justify-content: space-between;
  }

  .site-header__mark {
    width: 2.375rem;
    height: 2.375rem;
  }

  .site-header__brand-text {
    font-size: 0.9375rem;
  }

  .site-header__toggle {
    display: inline-flex;
    min-width: 44px;
    min-height: 44px;
    align-items: center;
    justify-content: center;
    gap: 4px;
    padding: 0 0.5rem;
    border: 1px solid var(--color-turquoise-400);
    border-radius: var(--radius-1);
    background: var(--color-night-900);
    color: var(--color-lavender-100);
    box-shadow: var(--inner-highlight);
  }

  .site-header__toggle-line {
    display: block;
    width: 1rem;
    height: 2px;
    background: var(--color-turquoise-400);
    transition: transform var(--transition-ui), opacity var(--transition-ui);
  }

  .site-header__toggle-text {
    margin-left: 0.25rem;
    font-family: var(--font-pixel);
    font-size: 0.5rem;
    line-height: 1;
    text-transform: uppercase;
  }

  .site-header.is-menu-open .site-header__toggle-line:nth-child(1) {
    transform: translateY(6px) rotate(45deg);
  }

  .site-header.is-menu-open .site-header__toggle-line:nth-child(2) {
    opacity: 0;
  }

  .site-header.is-menu-open .site-header__toggle-line:nth-child(3) {
    transform: translateY(-6px) rotate(-45deg);
  }

  .site-header__nav {
    position: fixed;
    z-index: 1000;
    top: 0;
    right: 0;
    bottom: 0;
    display: flex;
    width: min(100vw, 27rem);
    min-height: 100dvh;
    flex-direction: column;
    align-items: stretch;
    justify-content: flex-start;
    gap: var(--space-5);
    overflow-y: auto;
    padding: var(--space-4) var(--space-5) var(--space-6);
    border-left: 1px solid var(--color-turquoise-400);
    background: var(--color-night-950);
    box-shadow: -0.5rem 0 0 rgb(13 6 29 / 55%);
    opacity: 0;
    pointer-events: none;
    transform: translateX(100%);
    transition: opacity var(--transition-ui), transform var(--transition-ui);
  }

  .site-header__nav::before {
    position: fixed;
    z-index: -1;
    top: 0;
    right: 100%;
    width: 100vw;
    height: 100dvh;
    background: rgb(13 6 29 / 78%);
    content: "";
  }

  .site-header__nav.is-open {
    opacity: 1;
    pointer-events: auto;
    transform: translateX(0);
  }

  .site-header__nav-top {
    display: flex;
    min-height: 44px;
    align-items: center;
    justify-content: space-between;
    gap: var(--space-3);
    border-bottom: 1px solid var(--color-border-subtle);
  }

  .site-header__nav-label {
    color: var(--color-warm-yellow-300);
    font-family: var(--font-pixel);
    font-size: 0.6875rem;
    letter-spacing: 0.04em;
  }

  .site-header__close {
    display: inline-grid;
    width: 44px;
    min-height: 44px;
    place-items: center;
    border: 1px solid var(--color-border);
    border-radius: var(--radius-1);
    background: transparent;
    color: var(--color-white);
    font-size: 2rem;
    line-height: 1;
  }

  .site-header__nav-list {
    width: 100%;
    flex-direction: column;
    align-items: stretch;
    gap: 0;
  }

  .site-header__nav-list li {
    width: 100%;
    border-bottom: 1px solid var(--color-border-subtle);
  }

  .site-header__nav-list a {
    width: 100%;
    min-height: 48px;
    padding: var(--space-2) 0;
    border-bottom: 2px solid transparent;
    font-size: 1rem;
    white-space: normal;
  }

  .site-header__nav-mobile-only {
    display: flex !important;
  }

  .site-header__nav-action {
    width: 100%;
    min-height: 48px;
    margin-top: auto;
  }
}

@media (max-width: 420px) {
  .site-header__inner {
    gap: var(--space-2);
  }

  .site-header__brand-text {
    max-width: 10.5rem;
    font-size: 0.8125rem;
  }

  .site-header__toggle-text {
    display: none;
  }

  .site-header__toggle {
    padding-inline: 0.75rem;
  }
}

@media (prefers-reduced-motion: reduce) {
  .site-header__nav,
  .site-header__toggle-line {
    transition: none;
  }
}